US20190201828A1 - Adjustable abrasive & dust separator - Google Patents
Adjustable abrasive & dust separator Download PDFInfo
- Publication number
- US20190201828A1 US20190201828A1 US15/858,919 US201715858919A US2019201828A1 US 20190201828 A1 US20190201828 A1 US 20190201828A1 US 201715858919 A US201715858919 A US 201715858919A US 2019201828 A1 US2019201828 A1 US 2019201828A1
- Authority
- US
- United States
- Prior art keywords
- wall
- blast
- air
- passageway
- air foil
- 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.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
- B04B1/06—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of cylindrical shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C1/00—Apparatus in which the main direction of flow follows a flat spiral ; so-called flat cyclones or vortex chambers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
- B24C7/0015—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
- B24C9/003—Removing abrasive powder out of the blasting machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
- B24C9/006—Treatment of used abrasive material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/06—Impeller wheels; Rotor blades therefor
- B24C5/062—Rotor blades or vanes; Locking means therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Definitions
- the present invention relates generally to blast cabinets and, more particularly, to a uniquely configured centrifuge media separator that may be included with the blast cabinet and which is specifically adapted to separate blast particulate of various masses from fine particulate such that the blast particulate may be recycled through the blast cabinet while the fine particulate may be removed from the blast cabinet in order to improve the visibility of a workpiece being blasted within the blast cabinet.
- Blast cabinets are typically utilized to clean or generally prepare surfaces of a workpiece by directing high pressure fluid containing abrasive blast media or blast particulate toward the workpiece.
- the abrasive blast particulate is typically a relatively hard material such as sand, sodium bicarbonate (i.e., baking soda), metallic shot or glass beads although many other materials may be selected for use as the blast particulate. These media may have differing masses, and therefore differing momentums when moved by an air how of a given velocity.
- the blast cabinet typically includes a housing supported on legs. The housing defines a generally air tight enclosure having a pair of arm holes with gloves hermetically sealed thereto such that an operator may manipulate a blast hose and/or the workpiece for blasting thereof within the enclosure.
- the blast hose is configured to direct the high pressure fluid such as air carrying, the blast particulate at high velocity toward the workpiece surfaces.
- the blast cabinet typically includes a transparent window to allow the operator to manipulate the workpiece and to visually observe the progress of the blasting.
- the blast particulate bounces off of the workpiece and is generally violently thrown about within the enclosure such that a portion of the blast particulate normally breaks down into smaller dust-like particles hereinafter referred to as fine particulate.
- fine particulate surface coatings, dirt and scale that are abraded from the workpiece by the blast media contribute to the formation of fine particulate within the enclosure.
- the fine particulate is too small to be effective as a blast medium and therefore must be eventually removed from the blast cabinet.
- the fine particulate is of such small size such that it may be suspended in the air within the enclosure of the blast cabinet.
- the gradual buildup of the fine particulate can create a foggy or clouded environment within the enclosure which visually impairs or obstructs the operator's view of the workpiece. Due to health and safety regulations and environmental restrictions, the particulate-filled air cannot simply be exhausted to the atmosphere. Rather, the particulate-filled air must be filtered prior to exhaustion in order to remove the fine particulate carried therein.
- blast cabinets are ventilated and include filters such that at least a portion of the fine particulate may be purged from the air.
- Prior art cabinets having the capability to purge fine particulate from air prior to its, exhaustion out of the enclosure in order, to improve the operator's visibility of the workpiece within the enclosure have been made. These blast cabinets separate blast particulate from fine particulate such that the blast particulate may be recycled through, the blast cabinet.
- These blast cabinets also incorporate a centrifuge media separator which eliminates the need for a filter.
- blast cabinets work most effectively with higher mass blast media. Cost of higher mass blast media may make lower mass blast media more desirable. In addition, environmental regulation of a particular geographic location may dictate the use of lower mass blast media. Offering the flexibility for the same blast cabinet to use blast media of differing masses offers tremendous advantages.
- a blast cabinet for blasting the surface of a workpiece with blast media
- the blast cabinet may comprise a housing, and blast media placed within the housing.
- the blast cabinet may also include a centrifuge media separator.
- the centrifuge media separator may include a top panel, a bottom panel, an inner wall extending downwardly from the top panels, and an outer wall including surrounding the inner wall and extending between the top and bottom panels, the outer wall may define a truncated logarithmic spiral.
- the top panel, the bottom panel, inner wall, and outer wall may collectively define a passageway and a central opening, the passageway may have an inlet and an outlet and a transverse cross section which may generally decrease from the inlet to the outlet.
- the centrifuge media separator may further have an escape aperture in the outer wall, and an air foil adjacent the escape aperture, the air foil extending frons the outer wall in to the passageway a distance, the distance being adjustable between a minimum and a maximum.
- the centrifuge media separator may include a top panel, a bottom panel, an inner all which may extend from the top panel and may defining a gap between the inner wall and the bottom panel, and an outer wall which may include an escape aperture.
- the outer wall may surround the inner wall and extend between the top and bottom panels.
- the outer wall may define a truncated logarithmic spiral.
- the centrifuge media separator may include an air foil.
- the air foil may include a leading edge.
- the air foil may be attached to the outer wall and the leading edge may be angled in a direction opposite the air flow to direct a portion of the air flow to the escape aperture.
- the top panel, the bottom panel, inner wall, and outer wall may collectively define a passageway.
- the passageway may have an inlet and an outlet, and the passageway may have a transverse cross section which may generally decrease from the inlet to the outlet.
- the configuration of the passageway may cause fine particulate matter to be closer to the inner wall than the blast media, and the air foil may extend from the outer wall in to the passageway a distance to intercept the blast media and may direct the blast media to the escape aperture, the air foil may be adjustable to vary the distance between a minimum and a maximum.
- the method may include providing a top panel, providing a bottom panel, providing an inner wall including a top edge and a bottom edge;
- FIG. 1 is a perspective view of a blast cabinet having a centrifuge media separator of the present invention incorporated therein;
- FIG. 2A is a perspective view of the centrifuge media separator having a spiral configuration for centrifugally directing blast particulate to an outer wall of the media separator;
- FIG. 2B is a perspective view of a centrifuge media separator having an inner wall connected to the bottom panel;
- FIG. 2C is a perspective view of a centrifuge media separator having no inner wall
- FIG. 3 is a perspective view of the centrifuge media separator along sight line 3 in FIG. 2A , including the air foil placed in the escape aperture;
- FIG. 4 is an exploded detail perspective view of the air foil, escape aperture, and bracket of FIG. 3 ;
- FIG. 5 is a cross sectional view of the centrifuge media separator at, the line 5 - 5 of FIG. 3 ;
- FIG. 6 is a detail view of the air foil, escape aperture, and bracket of FIG. 5 with the air foil in the maximum position:
- FIG. 7 is a detail view of the air foil, escape aperture, and bracket of FIG. 5 with the air foil in the minimum position;
- FIG. 8A is a top cross section view of a centrifuge media separator with an alternative air foil
- FIG. 8B is a detail perspective view of the alternative air foil of FIG. 8A ;
- FIG. 8C is a detail top view of the alternative air foil
- FIG. 9A is a perspective of a centrifuge media separator showing the bottom panel, inner wall, and central opening;
- FIG. 9B is a side cross sectional view of the centrifuge media separator of FIG. 9A ;
- FIG. 10A is a perspective view of a centrifuge media separator showing the bottom panel and central opening.
- FIG. 10B is a side cross sectional view of the centrifuge media separator of FIG. 9A .
- the blast cabinet 10 including a centrifuge media separator 30 incorporated therein.
- the blast cabinet 10 may be comprised of a housing 48 supported on legs 40 .
- a section of the housing 48 may have a generally inverted pyramid shape such that spent blast particulate 18 may be funneled downwardly toward a tower portion of the housing 48 and subsequently picked up by the high pressure source (not shown) for recycling through the blast cabinet 10 .
- the housing 48 has a generally air tight enclosure 12 with arm holes 26 to which two hermetically sealed gloves 14 may be attached.
- the housing 48 also includes a transparent window 16 such that an operator may reach though the arm holes 26 to grasp and/or manipulate the workpiece 24 during blasting thereof with the pressure hose.
- the housing 48 of the blast cabinet 10 may also include at least one door allowing access into the enclosure 12 such that the workpiece 24 may be inserted therein and removed therefrom.
- the pressure hose is a conduit for a high pressure, high velocity fluid.
- the fluid acts as a carrier medium and carries blast particulate 18 for high velocity discharge onto surfaces of the workpiece 24 in order to remove coatings from or otherwise prepare the workpiece 24 surfaces, as will be described in greater detail below.
- the fluid may be a gas such as air as may be utilized in the blast cabinet 10 of FIG. 1 . However, the fluid may also be a liquid such as water. While the specific construction of the blast cabinet 10 is as shown in FIG. 1 , it should be noted that the centrifuge media separator 30 may be utilized or incorporated into blast cabinets 10 and other similar devices of differing configurations.
- the media in the blast cabinet 10 is generally comprised of blast particulate 18 and fine particulate 20 .
- the centrifuge media separator 30 separates the blast particulate 18 from the fine particulate 20 in order to purge the fine particulate 20 from an interior of the blast cabinet 10 so as to increase the visibility of a workpiece (not shown) being blasted by a pressure hose (not shown) within the blast cabinet.
- the centrifuge media separator 30 may be specifically configured to separate blast media.
- the outer wall may include an escape aperture 44 which may operate in combination with an adjustable an foil 50 .
- the air foil 50 may direct a portion of the high pressure, high velocity fluid toward the escape aperture 44 .
- the portion of the high pressure, high velocity fluid being directed toward the escape aperture 44 may be controlled by adjusting the air foil as is described in greater detail below.
- a portion of the high pressure, high velocity fluid may carry blast particulate 18 .
- Another portion of the high pressure, high velocity fluid may carry fine particulate 20 .
- the air foil 50 may be adjusted in the direction indicated by the arrow in FIG. 3 , so that the portion of the high pressure, high velocity fluid carrying the blast particulate 18 may be directed by the air foil 50 to the escape aperture 44 to enable separation of the blast particulate 18 from the fine particulate 20 . Separation of the blast particulate 18 from the tine particulate 20 allows for reclaiming or recycling of the blast particulate 18 through the blast, cabinet 10 in order to lower operating costs.
- the centrifuge media separator 30 may include a top panel 54 , a bottom panel 56 , an inner wall 42 , and an outer wall 40 .
- the outer wall 40 may extend between the top and bottom panels 54 , 56 , and this orientation creates an outer surface and inner surface of the outer wall 40 .
- the outer wall 40 may surround the inner wall 42 .
- the inner wall 42 may include a top edge and a bottom edge. The top edge may be attached to the top panel 54 , such that the inner wall 42 extends partially downwardly from the top panel 54 .
- the bottom edge of the inner wall 42 and the bottom panel 56 may define a gap.
- the inner wall 42 may extend downwardly about one-quarter to about one-third of an overall height of the centrifuge media separator 30 although the inner wall 42 may extend downwardly in any amount.
- the inner wall 42 further defines a central opening 36 in the top and bottom panels 54 , 56 .
- the overall height of the centrifuge media separator 30 is defined by a distance between the top and bottom panels 54 , 56 .
- the bottom edge of the inner wall 42 may be connected to the bottom panel 56 .
- the top edge of the inner wall 42 and the top panel 54 may fool). a gap.
- the centrifuge media separator may have no inner wall 42 . Regardless of whether the inner wall extends from the top panel 54 or the bottom panel 56 , the presence of an inner wall 42 will improve the efficiency of the centrifuge media separator 30 . That is, the higher the efficiency only increasingly smaller particles will be returned to the dust collector.
- the top panel 54 , bottom panel 56 , inner wall 42 , and outer wall 40 may collectively form an air passageway through which the blast media may be drawn by a low pressure source 52 such as a blower mounted on the blast cabinet 10 .
- the centrifuge media separator 30 is fluidly connected to an interior 12 of the blast cabinet 10 .
- the low pressure source 52 is fluidly connected to the central opening 36 and is configured to draw air into the inlet 34 and exhaust air through the central opening 36 . In this manner, the blast media may be drawn upwardly from the interior 12 and into the air passageway 32 wherein the blast particulate 18 may be separated from the fine particulate 20 .
- a filter 22 may be provided with the blast cabinet 10 to filter excess amounts of fine particulate 20 leaving the air passageway 32 prior to exhaustion out of the blast cabinet 10 .
- the blower may be mounted on the blast cabinet 10 above the centrifuge media separator 30 .
- the blower is configured to ventilate the interior 12 by providing low pressure in an area surrounding the centrifuge media separator 30 .
- the low pressure provided by the blower draws spent portions of the blast media into the centrifuge media separator 30 for subsequent separation into blast particulate 18 and fine particulate 20 .
- the inlet 34 of the passageway may be rectangular shaped due to the orthogonal relation of the top and bottom panels 54 , 56 and the outer wall 40 .
- the outlet 38 may also be partially rectangular shaped due to the orthogonal relation of the top and bottom panels 54 , 56 , the outer wall 40 and inner wall 42 .
- the inlet 34 may be configured in a variety of alternative shapes as may be provided by including an inlet 34 extension of, for example, cylindrical shape.
- the outlet 38 configuration may be generally determined by the shape of the upper and lower panels 54 , 56 and the shape or the outer and inner walls 40 , 42 .
- the inlet 34 is configured to allow a flow of air to enter the air passageway 32 and circulate therethrough toward the outlet 38 .
- the air passageway 32 is preferably configured such that a cross sectional area thereof generally decreases along a direction of the flow. Due to the truncated logarithmic spiral shape of the outer wall 40 , and correspondingly. the passageway, the outlet 38 is disposed radially inwardly relative to and positioned downstream of the inlet 34 such that the flow of air enters the inlet 34 , circulates through the air passageway 32 , exits the outlet 38 , and rejoins the flow of air entering the inlet 34 .
- the escape aperture 44 is configured to exhaust the blast particulate 18 out of the passageway.
- the central opening 36 is configured to exhaust the fine particulate 20 out of the passageway when the low pressure source 52 is applied to an area surrounding the central opening 36 in the top panel 54 , as will be described in greater detail below.
- the centrifuge media separator 30 may be manufactured from material selected from the group consisting of wood, plastic, metal, stainless steel, steel, or other suitable material and any combination thereof.
- the outer wall 40 may include at least one particulate escape aperture 44 formed therein such that the blast particulate 18 may be exhausted from the air passageway 32 for subsequent recycling through the blast cabinet 10 .
- the escape aperture 44 may extend the entire height of the outer wall 40 , may extend more than three quarters of the height of the outer wall 40 , or more than half of the height of the, outer wall 40 .
- the width of the escape aperture 44 may vary.
- the escape aperture 44 may be as little as 1/64 inch or small and as much as 11 ⁇ 4 inch or larger. Other configurations are also contemplated.
- the outer wall 40 may include an air foil 50 mounted thereon on a downstream side of the escape aperture 44 .
- the air foil 50 may be configured to create a local area of high pressure adjacent the escape aperture 44 .
- the air foil 50 may vary aspects of the escape aperture 44 .
- the air foil 50 may extend in to the air passageway 32 to change the shape of the escape aperture 44 , or may change the width of, the escape aperture 44 , or both, as described in detail below.
- the air foil 50 may extend generally radially inwardly toward the central opening 36 and may span a distance between the upper and lower panels 54 , 56 . More specifically, the air foil 50 may be angled inwardly in a direction generally opposite that of a direction of flow from the inlet 34 to the outlet 38 . The direction of flow into the inlet 34 and within the air passageway 32 is indicated in FIG. 2 by the arrow A. As shown in FIGS. 5-7 . the air foil 50 may be oriented at an angle of about forty-five degrees relative to a tangent of the outer wall 40 at a location from which the air foil 50 may extend.
- the air foil 50 may be provided in a variety of alternative configurations, including angles between 50 and 55 degrees. Due to its shape and orientation in the air passageway 32 , the air foil 50 may be configured to facilitate exhaustion of the blast particulate 18 through the escape aperture 44 .
- the air foil 50 may be a separate component that is mounted on the outer wall 40 . Alternatively, the air foil 50 may be integrally faulted with the outer wall 40 .
- the air foil 50 may include a bracket 60 , for example an angle bracket. attached to an outer surface 41 of the outer wall 40 , a blade 35 , and one or more mechanical fasteners 66 .
- the bracket 60 may have two sections joined along an edge, forming a “V”-shaped transverse cross section.
- the bracket 60 may be joined to the outer surface of the outer wall on a face of one of the two sections.
- the bracket 60 may be joined to the outer surface of the outer wall along two free ends of the sections.
- the bracket 60 may be oriented at an angle of about forty-five degrees relative to a tangent of the outer wall 40 at a location from which the bracket 60 may be attached.
- the bracket 60 may be provided in a variety of alternative configurations.
- the bracket 60 may be attached to the outer wall 40 , or top or bottom panels 54 , 56 .
- the blade 35 may include a number of adjustment slots 62 .
- the bracket 60 may include the same number of holes 64 .
- the blade 35 may be fixed to the bracket 60 using the one or more mechanical fasteners 66 .
- the adjustment slots 62 may have a first end 68 and a second end 70 .
- FIG. 7 when the blade 35 is fixed to the bracket 60 with the one or more mechanical fasteners 66 located at the first end 68 , the blade 35 is at a minimum extension in to the passageway 32 . At the minimum extension, the blade 35 may direct only the blast particulate 18 with the greatest mass through the escape aperture 44 . As shown in FIG.
- the blade 35 when the blade 35 is fixed to the bracket 60 with the one or more mechanical fasteners 66 at the second end 70 , the blade 35 is at a maximum extension in to the passageway 32 .
- the blade 35 may also be fixed to the bracket 60 at any point in between the first end 68 and the second end 70 of the adjustment slots 62 .
- the air foil 50 may direct blast particulate 18 of decreasing mass through the escape aperture 44 , while still allowing the fine particulate 20 to continue to the outlet 38 .
- the blade 35 may also include a leading edge 37 which is tapered relative to front and rear faces of the blade 35 .
- the taper on the leading edge 37 may help to create the area of high pressure adjacent to the escape aperture 44 .
- the taper on the leading edge 37 may present a relatively flat surface to the air flow as opposed to an angled surface.
- the taper may be created by a shorter front face of the blade and a longer rear faces of the blade 35 .
- the one or more mechanical fasteners 66 may create a friction connection between the one or more fasteners 66 , the blade 35 , and the bracket 60 , preventing the blade 35 from moving relative to the bracket 60 .
- the one or more mechanical fasteners 66 may include a nut and bolt combination including various types of nuts, for example standard hexagonal nuts and wing nuts, or holding screws that engage threads on the angle bracket holes.
- the blade 35 and bracket 60 may be attached by any removable means which prevent the blade 35 and bracket 60 from moving relative to one another.
- the air foil 50 may include two sections, a base section 70 and a blade section 72 .
- the base section 70 may include adjustment slots 74 .
- the adjustment slots 74 may have a longitudinal axis substantially parallel to a top edge and a bottom edge of the outer wall 40 .
- a mechanical fastener 66 may be disposed in each of the adjustment slots 74 .
- the each of the mechanical fasteners 66 may attach to the outer wall 40 of the centrifuge, media separator 30 .
- the mechanical fasteners 66 may pass through both the adjustment slots 74 and the outer wall 40 and have two pieces which compress the base section 70 and outer wall 40 in between the two pieces of the mechanical fastener 66 .
- the mechanical fastener 66 may be a nut and bolt with the bolt on the inside of the outer wall 40 and the nut compressing against the base section 70 .
- the head of the bolt or nut may be disposed on the side of the blade section 72 opposite the air flow, indicated by the arrows in FIG. 8A , in the air passageway 32 .
- the placement of the head of the bolt or nut behind the blade section 72 prevents wear on the head of the bolt or nut from the impact of particles.
- the mechanical Fasteners 66 may be loosened and the base section 70 moved so that the air foil 50 changes the width of the escape aperture 44 . Adjusting the width of the escape aperture 44 changes the efficiency of the centrifuge media separator 30 . Again, the narrower the escape aperture 44 , the smaller the particle that is sent to the dust collector.
- the blade section 72 may form a common edge 76 with the base section 70 .
- the blade section 72 may have a fixed width from the common edge 76 to a free edge 78 of the blade section 70 .
- the fixed width means that the blade section 72 will extend to a fixed depth in the air passageway 32 .
- blade 35 or the blade section 72 and base section 70 are removeably attached, they may be replaced when they experience wear.
- the ability to replace worn blades 35 or air foil 50 with the blade section 72 and base section 70 means that the centrifuge media separator 30 will not experience a large drop in efficiency because of the wear to the parts.
- the configuration including no air foil 50 may function well for low efficiency applications with large, heavy abrasives.
- the escape aperture 44 in this configuration may be from 1 ⁇ 4 inch to 1.5 inches, with 3 ⁇ 4 inch to 1 inch being preferred.
- the heavy abrasive may have enough momentum to continue on a path defined by a tangent to the curve of the outer wall 40 at the near side of the escape aperture 44 .
- the curve of the outer wall 40 may allow the abrasive to pass through the escape aperture 44 on the path of the tangent.
- the centrifuge media separator 30 may be attached to the blower as mentioned above.
- the blower creates an area of low pressure adjacent the central opening 36 .
- the area of low pressure draws air into the inlet 34 .
- the air contains a combination of blast particulate 18 and fine particulate 20 .
- the centrifuge media separator 30 is configured such that the air passageway 32 circles about itself, particulate having a density greater than the air (i.e., the blast particulate 18 ) tends to be centrifugally directed toward, the outer wall 40 .
- the blast particulate 18 may circulate within the centrifuge media separator 30 in a sliding manner against the outer wall 40 .
- the blast particulate 18 may be directed to the escape aperture 44 by the air foil 50 , and exhausted from the air passageway 32 . If no blast particulate 18 is exhausted through the escape aperture 44 , it may be because the blast particulate 18 has a relatively lower mass, and is travelling in the air flow too far away from the outer wall 40 to be directed to the escape aperture 44 by the air foil 50 .
- the air foil 50 and specifically, the blade 35 , may be adjusted by loosening the mechanical fasteners 66 and sliding the blade 35 to extend further in to the passageway 32 , then retightening the one or more mechanical fasteners 66 .
- An air foil 50 which extends further in to the passageway 32 will capture lower mass blast particulate.
- a pressure, differential may exist between an inside and outside of the air passageway 32 at an area adjacent the escape aperture 44 .
- the air foil may 50 extend in to the air passageway 32 some distance at an angle. When the air flowing through the air passageway 32 contacts the blade 35 , the air will change direction, and the change in direction will reduce the velocity of the air. The reduced velocity air will be at a pressure higher than the air in the air passageway 32 moving at a constant velocity or than air that is accelerating in the air passageway 32 .
- the air exterior to the passageway 32 may have a lower pressure compared to that on the inside of the air passageway 32 , and even lower than the air in the vicinity of the air foil 50 , such that the blast particulate 18 is drawn to the outside of the air passageway 32 .
- gravity may draw the blast particulate 18 downwardly into a blast particulate hopper such that the blast particulate 18 can be reused.
- the pressure differential between the inside and outside of the air passageway 32 may be Increased with the addition of the air foil 50 such that the separating efficiency of the centrifuge media separator 30 is enhanced.
- the ability to precisely adjust the air foil 50 allows flexibility in the blast particulate 18 the blast cabinet 10 may use.
- the air circulating through the air passageway 32 may contain fine particulate 20 .
- the air with fine particulate 20 may be drawn through the central opening 36 formed in the upper panel 54 due to the application of low pressure by the blower.
- the air may pass under and around the inner wall 42 such that it may be drawn upwardly through the central opening 36 .
- the low pressure may be sufficient to draw air with fine particulate 20 through the central opening 36 but not insufficient to draw the blast particulate 18 therethrough.
- the blast particulate 18 downstream of the escape aperture 44 may be recirculated through the air passageway 32 and redirected back to the inlet 34 such that the blast particulate 18 might pass through the escape aperture 44 .
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Abstract
Description
- Not Applicable
- Not Applicable
- The present invention relates generally to blast cabinets and, more particularly, to a uniquely configured centrifuge media separator that may be included with the blast cabinet and which is specifically adapted to separate blast particulate of various masses from fine particulate such that the blast particulate may be recycled through the blast cabinet while the fine particulate may be removed from the blast cabinet in order to improve the visibility of a workpiece being blasted within the blast cabinet.
- Blast cabinets are typically utilized to clean or generally prepare surfaces of a workpiece by directing high pressure fluid containing abrasive blast media or blast particulate toward the workpiece. The abrasive blast particulate is typically a relatively hard material such as sand, sodium bicarbonate (i.e., baking soda), metallic shot or glass beads although many other materials may be selected for use as the blast particulate. These media may have differing masses, and therefore differing momentums when moved by an air how of a given velocity. The blast cabinet typically includes a housing supported on legs. The housing defines a generally air tight enclosure having a pair of arm holes with gloves hermetically sealed thereto such that an operator may manipulate a blast hose and/or the workpiece for blasting thereof within the enclosure. The blast hose is configured to direct the high pressure fluid such as air carrying, the blast particulate at high velocity toward the workpiece surfaces. The blast cabinet typically includes a transparent window to allow the operator to manipulate the workpiece and to visually observe the progress of the blasting.
- During blasting, the blast particulate bounces off of the workpiece and is generally violently thrown about within the enclosure such that a portion of the blast particulate normally breaks down into smaller dust-like particles hereinafter referred to as fine particulate. In addition, surface coatings, dirt and scale that are abraded from the workpiece by the blast media contribute to the formation of fine particulate within the enclosure. The fine particulate is too small to be effective as a blast medium and therefore must be eventually removed from the blast cabinet. In addition. the fine particulate is of such small size such that it may be suspended in the air within the enclosure of the blast cabinet. Over time, the gradual buildup of the fine particulate can create a foggy or clouded environment within the enclosure which visually impairs or obstructs the operator's view of the workpiece. Due to health and safety regulations and environmental restrictions, the particulate-filled air cannot simply be exhausted to the atmosphere. Rather, the particulate-filled air must be filtered prior to exhaustion in order to remove the fine particulate carried therein.
- Accordingly, many prior art blast cabinets are ventilated and include filters such that at least a portion of the fine particulate may be purged from the air. Prior art cabinets having the capability to purge fine particulate from air prior to its, exhaustion out of the enclosure in order, to improve the operator's visibility of the workpiece within the enclosure have been made. These blast cabinets separate blast particulate from fine particulate such that the blast particulate may be recycled through, the blast cabinet. These blast cabinets also incorporate a centrifuge media separator which eliminates the need for a filter.
- However, because the differing masses of blast media, the principle of operation of the state of the art blast cabinets is such that the blast cabinets work most effectively with higher mass blast media. Cost of higher mass blast media may make lower mass blast media more desirable. In addition, environmental regulation of a particular geographic location may dictate the use of lower mass blast media. Offering the flexibility for the same blast cabinet to use blast media of differing masses offers tremendous advantages.
- In accordance with the present disclosure, there is provided a blast cabinet for blasting the surface of a workpiece with blast media, the blast cabinet may comprise a housing, and blast media placed within the housing. The blast cabinet may also include a centrifuge media separator. The centrifuge media separator may include a top panel, a bottom panel, an inner wall extending downwardly from the top panels, and an outer wall including surrounding the inner wall and extending between the top and bottom panels, the outer wall may define a truncated logarithmic spiral. The top panel, the bottom panel, inner wall, and outer wall may collectively define a passageway and a central opening, the passageway may have an inlet and an outlet and a transverse cross section which may generally decrease from the inlet to the outlet. The centrifuge media separator may further have an escape aperture in the outer wall, and an air foil adjacent the escape aperture, the air foil extending frons the outer wall in to the passageway a distance, the distance being adjustable between a minimum and a maximum.
- There is further provided in the present disclosure a centrifuge media separator for separating blast media from fine particulate matter when both the blast media and fine particulate matter are carried in an air flow. The centrifuge media separator may include a top panel, a bottom panel, an inner all which may extend from the top panel and may defining a gap between the inner wall and the bottom panel, and an outer wall which may include an escape aperture. The outer wall may surround the inner wall and extend between the top and bottom panels. The outer wall may define a truncated logarithmic spiral. The centrifuge media separator may include an air foil. The air foil may include a leading edge. The air foil may be attached to the outer wall and the leading edge may be angled in a direction opposite the air flow to direct a portion of the air flow to the escape aperture. The top panel, the bottom panel, inner wall, and outer wall may collectively define a passageway. The passageway may have an inlet and an outlet, and the passageway may have a transverse cross section which may generally decrease from the inlet to the outlet. When the blast media and fine particulate matter enter the passageway at the inlet, and are carried by the airflow toward the outlet, the configuration of the passageway may cause fine particulate matter to be closer to the inner wall than the blast media, and the air foil may extend from the outer wall in to the passageway a distance to intercept the blast media and may direct the blast media to the escape aperture, the air foil may be adjustable to vary the distance between a minimum and a maximum.
- There is further provided in the present disclosure a method of forming a centrifuge media separator for separating blast media from fine particulate matter when both the blast media and fine particulate matter are carried in an air flow. The method may include providing a top panel, providing a bottom panel, providing an inner wall including a top edge and a bottom edge;
-
- attaching the top panel, to the top edge of the inner wall such that there is a gap between the bottom edge and the bottom panel;
- providing an outer wall including an escape aperture, an upper edge, and a lower edge;
- attaching the outer wall so that the outer wall surrounds the inner wall and the upper edge attaches to the top panel and the lower edge attaches to the bottom panel, the outer wall defining a truncated logarithmic spiral; and
- attaching, an air foil to the outer wall, the air foil including a leading edge and adjustment slots, the adjustment slots including a first end and a second end, and the leading edge being angled in a direction opposite the air flow to direct a portion of the air flow to the escape aperture;
- wherein the top panel, the bottom panel, inner wall, and outer wall collectively define a passageway, the passageway having an inlet and an outlet, and a transverse cross section which generally decreases from the inlet to the outlet and the air foil is adjustable from the first end, to the second end of the adjustment slots to move the leading edge from closer to the outer wall to further away from the outer wall.
- These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which:
-
FIG. 1 is a perspective view of a blast cabinet having a centrifuge media separator of the present invention incorporated therein; -
FIG. 2A is a perspective view of the centrifuge media separator having a spiral configuration for centrifugally directing blast particulate to an outer wall of the media separator; -
FIG. 2B is a perspective view of a centrifuge media separator having an inner wall connected to the bottom panel; -
FIG. 2C is a perspective view of a centrifuge media separator having no inner wall; -
FIG. 3 is a perspective view of the centrifuge media separator alongsight line 3 inFIG. 2A , including the air foil placed in the escape aperture; -
FIG. 4 is an exploded detail perspective view of the air foil, escape aperture, and bracket ofFIG. 3 ; -
FIG. 5 is a cross sectional view of the centrifuge media separator at, the line 5-5 ofFIG. 3 ; -
FIG. 6 is a detail view of the air foil, escape aperture, and bracket ofFIG. 5 with the air foil in the maximum position: -
FIG. 7 is a detail view of the air foil, escape aperture, and bracket ofFIG. 5 with the air foil in the minimum position; -
FIG. 8A is a top cross section view of a centrifuge media separator with an alternative air foil; -
FIG. 8B is a detail perspective view of the alternative air foil ofFIG. 8A ; -
FIG. 8C is a detail top view of the alternative air foil; -
FIG. 9A is a perspective of a centrifuge media separator showing the bottom panel, inner wall, and central opening; -
FIG. 9B is a side cross sectional view of the centrifuge media separator ofFIG. 9A ; -
FIG. 10A is a perspective view of a centrifuge media separator showing the bottom panel and central opening; and -
FIG. 10B is a side cross sectional view of the centrifuge media separator ofFIG. 9A . - The detailed description set forth below in connection with the appended drawings is intended as a description of certain embodiments of a machining tool assembly for a firearm lower receiver and is not intended to represent the only forms that may be developed or utilized. The description sets, forth the various structure(s) and/or functions in connection with the illustrated embodiments, but it is to be understood, however, that the same or equivalent structure and/or functions may be accomplished by different embodiments that are also intended to be encompassed within the scope of the present disclosure. It is further understood that the use of relational terms such as first and second, and the like are used solely to distinguish one entity from another without necessarily requiring or implying any actual such relationship or order between such entities.
- Referring to
FIG. 1 , shown is theblast cabinet 10 including acentrifuge media separator 30 incorporated therein. Theblast cabinet 10 may be comprised of ahousing 48 supported onlegs 40. A section of thehousing 48 may have a generally inverted pyramid shape such that spentblast particulate 18 may be funneled downwardly toward a tower portion of thehousing 48 and subsequently picked up by the high pressure source (not shown) for recycling through theblast cabinet 10. Thehousing 48 has a generally airtight enclosure 12 witharm holes 26 to which two hermetically sealedgloves 14 may be attached. Thehousing 48 also includes a transparent window 16 such that an operator may reach though the arm holes 26 to grasp and/or manipulate the workpiece 24 during blasting thereof with the pressure hose. - The
housing 48 of theblast cabinet 10 may also include at least one door allowing access into theenclosure 12 such that the workpiece 24 may be inserted therein and removed therefrom. The pressure hose is a conduit for a high pressure, high velocity fluid. The fluid acts as a carrier medium and carries blast particulate 18 for high velocity discharge onto surfaces of the workpiece 24 in order to remove coatings from or otherwise prepare the workpiece 24 surfaces, as will be described in greater detail below. The fluid may be a gas such as air as may be utilized in theblast cabinet 10 ofFIG. 1 . However, the fluid may also be a liquid such as water. While the specific construction of theblast cabinet 10 is as shown inFIG. 1 , it should be noted that thecentrifuge media separator 30 may be utilized or incorporated intoblast cabinets 10 and other similar devices of differing configurations. - The media in the
blast cabinet 10 is generally comprised ofblast particulate 18 andfine particulate 20. Although the mass of theblast particulate 18 may vary between lower and higher masses, thecentrifuge media separator 30 separates the blast particulate 18 from thefine particulate 20 in order to purge the fine particulate 20 from an interior of theblast cabinet 10 so as to increase the visibility of a workpiece (not shown) being blasted by a pressure hose (not shown) within the blast cabinet. - As shown in
FIGS. 2-5 , thecentrifuge media separator 30 may be specifically configured to separate blast media. To achieve the separation of theblast particulate 18 and thefine particulate 20 the outer wall may include anescape aperture 44 which may operate in combination with an adjustable anfoil 50. Theair foil 50 may direct a portion of the high pressure, high velocity fluid toward theescape aperture 44. The portion of the high pressure, high velocity fluid being directed toward theescape aperture 44 may be controlled by adjusting the air foil as is described in greater detail below. - A portion of the high pressure, high velocity fluid may carry
blast particulate 18. Another portion of the high pressure, high velocity fluid may carryfine particulate 20. Theair foil 50 may be adjusted in the direction indicated by the arrow inFIG. 3 , so that the portion of the high pressure, high velocity fluid carrying theblast particulate 18 may be directed by theair foil 50 to theescape aperture 44 to enable separation of the blast particulate 18 from thefine particulate 20. Separation of the blast particulate 18 from thetine particulate 20 allows for reclaiming or recycling of theblast particulate 18 through the blast,cabinet 10 in order to lower operating costs. - As shown in
FIGS. 2 and 3 , thecentrifuge media separator 30 may include atop panel 54, abottom panel 56, aninner wall 42, and anouter wall 40. Theouter wall 40 may extend between the top andbottom panels outer wall 40. Theouter wall 40 may surround theinner wall 42. Theinner wall 42 may include a top edge and a bottom edge. The top edge may be attached to thetop panel 54, such that theinner wall 42 extends partially downwardly from thetop panel 54. The bottom edge of theinner wall 42 and thebottom panel 56 may define a gap. In this regard, theinner wall 42 may extend downwardly about one-quarter to about one-third of an overall height of thecentrifuge media separator 30 although theinner wall 42 may extend downwardly in any amount. Theinner wall 42 further defines acentral opening 36 in the top andbottom panels centrifuge media separator 30 is defined by a distance between the top andbottom panels inner wall 42 with thecentrifuge media separator 30, the operating efficiency thereof may be improved. - Alternatively, as shown in the
centrifuge media separator 30 ofFIGS. 9A and 9B , the bottom edge of theinner wall 42 may be connected to thebottom panel 56. When the bottom edge of theinner wall 42 may be connected to thebottom panel 56, the top edge of theinner wall 42 and thetop panel 54 may fool). a gap. As shown inFIGS. 10A and 10B , the centrifuge media separator may have noinner wall 42. Regardless of whether the inner wall extends from thetop panel 54 or thebottom panel 56, the presence of aninner wall 42 will improve the efficiency of thecentrifuge media separator 30. That is, the higher the efficiency only increasingly smaller particles will be returned to the dust collector. - The
top panel 54,bottom panel 56,inner wall 42, andouter wall 40 may collectively form an air passageway through which the blast media may be drawn by alow pressure source 52 such as a blower mounted on theblast cabinet 10. Thecentrifuge media separator 30 is fluidly connected to an interior 12 of theblast cabinet 10. Thelow pressure source 52 is fluidly connected to thecentral opening 36 and is configured to draw air into theinlet 34 and exhaust air through thecentral opening 36. In this manner, the blast media may be drawn upwardly from the interior 12 and into theair passageway 32 wherein theblast particulate 18 may be separated from thefine particulate 20. Optionally, afilter 22 may be provided with theblast cabinet 10 to filter excess amounts offine particulate 20 leaving theair passageway 32 prior to exhaustion out of theblast cabinet 10. The blower may be mounted on theblast cabinet 10 above thecentrifuge media separator 30. The blower is configured to ventilate the interior 12 by providing low pressure in an area surrounding thecentrifuge media separator 30. The low pressure provided by the blower draws spent portions of the blast media into thecentrifuge media separator 30 for subsequent separation intoblast particulate 18 andfine particulate 20. - The
inlet 34 of the passageway may be rectangular shaped due to the orthogonal relation of the top andbottom panels outer wall 40. Similarly, theoutlet 38 may also be partially rectangular shaped due to the orthogonal relation of the top andbottom panels outer wall 40 andinner wall 42. However, theinlet 34 may be configured in a variety of alternative shapes as may be provided by including aninlet 34 extension of, for example, cylindrical shape. Similarly, theoutlet 38 configuration may be generally determined by the shape of the upper andlower panels inner walls inlet 34 is configured to allow a flow of air to enter theair passageway 32 and circulate therethrough toward theoutlet 38. - As can be seen in
FIGS. 2 and 5 , theair passageway 32 is preferably configured such that a cross sectional area thereof generally decreases along a direction of the flow. Due to the truncated logarithmic spiral shape of theouter wall 40, and correspondingly. the passageway, theoutlet 38 is disposed radially inwardly relative to and positioned downstream of theinlet 34 such that the flow of air enters theinlet 34, circulates through theair passageway 32, exits theoutlet 38, and rejoins the flow of air entering theinlet 34. Theescape aperture 44 is configured to exhaust theblast particulate 18 out of the passageway. Thecentral opening 36 is configured to exhaust thefine particulate 20 out of the passageway when thelow pressure source 52 is applied to an area surrounding thecentral opening 36 in thetop panel 54, as will be described in greater detail below. Thecentrifuge media separator 30 may be manufactured from material selected from the group consisting of wood, plastic, metal, stainless steel, steel, or other suitable material and any combination thereof. - The
outer wall 40 may include at least oneparticulate escape aperture 44 formed therein such that theblast particulate 18 may be exhausted from theair passageway 32 for subsequent recycling through theblast cabinet 10. Theescape aperture 44 may extend the entire height of theouter wall 40, may extend more than three quarters of the height of theouter wall 40, or more than half of the height of the,outer wall 40. The width of theescape aperture 44 may vary. By way of example and not limitation, theescape aperture 44 may be as little as 1/64 inch or small and as much as 1¼ inch or larger. Other configurations are also contemplated. - The
outer wall 40 may include anair foil 50 mounted thereon on a downstream side of theescape aperture 44. Theair foil 50 may be configured to create a local area of high pressure adjacent theescape aperture 44. Theair foil 50 may vary aspects of theescape aperture 44. By way of example and not limitation, theair foil 50 may extend in to theair passageway 32 to change the shape of theescape aperture 44, or may change the width of, theescape aperture 44, or both, as described in detail below. - As shown in
FIGS. 3-7 , theair foil 50 may extend generally radially inwardly toward thecentral opening 36 and may span a distance between the upper andlower panels air foil 50 may be angled inwardly in a direction generally opposite that of a direction of flow from theinlet 34 to theoutlet 38. The direction of flow into theinlet 34 and within theair passageway 32 is indicated inFIG. 2 by the arrow A. As shown inFIGS. 5-7 . theair foil 50 may be oriented at an angle of about forty-five degrees relative to a tangent of theouter wall 40 at a location from which theair foil 50 may extend. However, it is contemplated that theair foil 50 may be provided in a variety of alternative configurations, including angles between 50 and 55 degrees. Due to its shape and orientation in theair passageway 32, theair foil 50 may be configured to facilitate exhaustion of theblast particulate 18 through theescape aperture 44. Theair foil 50 may be a separate component that is mounted on theouter wall 40. Alternatively, theair foil 50 may be integrally faulted with theouter wall 40. - The
air foil 50 may include abracket 60, for example an angle bracket. attached to an outer surface 41 of theouter wall 40, ablade 35, and one or moremechanical fasteners 66. Thebracket 60 may have two sections joined along an edge, forming a “V”-shaped transverse cross section. Thebracket 60 may be joined to the outer surface of the outer wall on a face of one of the two sections. Alternatively, thebracket 60 may be joined to the outer surface of the outer wall along two free ends of the sections. Thebracket 60 may be oriented at an angle of about forty-five degrees relative to a tangent of theouter wall 40 at a location from which thebracket 60 may be attached. However, it is contemplated that thebracket 60 may be provided in a variety of alternative configurations. Additionally, thebracket 60 may be attached to theouter wall 40, or top orbottom panels - The
blade 35 may include a number ofadjustment slots 62. Thebracket 60 may include the same number ofholes 64. Using theadjustment slots 62 and holes 64, theblade 35 may be fixed to thebracket 60 using the one or moremechanical fasteners 66. Theadjustment slots 62 may have afirst end 68 and asecond end 70. As, shown inFIG. 7 , when theblade 35 is fixed to thebracket 60 with the one or moremechanical fasteners 66 located at thefirst end 68, theblade 35 is at a minimum extension in to thepassageway 32. At the minimum extension, theblade 35 may direct only the blast particulate 18 with the greatest mass through theescape aperture 44. As shown inFIG. 6 , when theblade 35 is fixed to thebracket 60 with the one or moremechanical fasteners 66 at thesecond end 70, theblade 35 is at a maximum extension in to thepassageway 32. Theblade 35 may also be fixed to thebracket 60 at any point in between thefirst end 68 and thesecond end 70 of theadjustment slots 62. When theblade 35 is set at points beyond the minimum, theair foil 50 may direct blast particulate 18 of decreasing mass through theescape aperture 44, while still allowing thefine particulate 20 to continue to theoutlet 38. - The
blade 35 may also include aleading edge 37 which is tapered relative to front and rear faces of theblade 35. The taper on the leadingedge 37 may help to create the area of high pressure adjacent to theescape aperture 44. When theblade 35 is attached to thebracket 60 using themechanical fasteners 66, the taper on the leadingedge 37 may present a relatively flat surface to the air flow as opposed to an angled surface. The taper may be created by a shorter front face of the blade and a longer rear faces of theblade 35. - The one or more
mechanical fasteners 66 may create a friction connection between the one ormore fasteners 66, theblade 35, and thebracket 60, preventing theblade 35 from moving relative to thebracket 60. By way of example and not limitation, the one or moremechanical fasteners 66 may include a nut and bolt combination including various types of nuts, for example standard hexagonal nuts and wing nuts, or holding screws that engage threads on the angle bracket holes. Alternatively, theblade 35 andbracket 60 may be attached by any removable means which prevent theblade 35 andbracket 60 from moving relative to one another. - Alternatively, as shown in
FIGS. 8A, 8B, and 8C theair foil 50 may include two sections, abase section 70 and ablade section 72. Thebase section 70 may includeadjustment slots 74. Theadjustment slots 74 may have a longitudinal axis substantially parallel to a top edge and a bottom edge of theouter wall 40. Amechanical fastener 66 may be disposed in each of theadjustment slots 74. The each of themechanical fasteners 66 may attach to theouter wall 40 of the centrifuge,media separator 30. Alternatively, themechanical fasteners 66 may pass through both theadjustment slots 74 and theouter wall 40 and have two pieces which compress thebase section 70 andouter wall 40 in between the two pieces of themechanical fastener 66. For example, themechanical fastener 66 may be a nut and bolt with the bolt on the inside of theouter wall 40 and the nut compressing against thebase section 70. The head of the bolt or nut may be disposed on the side of theblade section 72 opposite the air flow, indicated by the arrows inFIG. 8A , in theair passageway 32. The placement of the head of the bolt or nut behind theblade section 72 prevents wear on the head of the bolt or nut from the impact of particles. Themechanical Fasteners 66 may be loosened and thebase section 70 moved so that theair foil 50 changes the width of theescape aperture 44. Adjusting the width of theescape aperture 44 changes the efficiency of thecentrifuge media separator 30. Again, the narrower theescape aperture 44, the smaller the particle that is sent to the dust collector. - The
blade section 72 may form acommon edge 76 with thebase section 70. Theblade section 72 may have a fixed width from thecommon edge 76 to afree edge 78 of theblade section 70. The fixed width means that theblade section 72 will extend to a fixed depth in theair passageway 32. - Because the
blade 35 or theblade section 72 andbase section 70 are removeably attached, they may be replaced when they experience wear. The ability to replaceworn blades 35 orair foil 50 with theblade section 72 andbase section 70 means that thecentrifuge media separator 30 will not experience a large drop in efficiency because of the wear to the parts. - Alternatively, there may be no
air foil 50 in theescape aperture 44, The configuration including noair foil 50 may function well for low efficiency applications with large, heavy abrasives. Theescape aperture 44 in this configuration may be from ¼ inch to 1.5 inches, with ¾ inch to 1 inch being preferred. The heavy abrasive may have enough momentum to continue on a path defined by a tangent to the curve of theouter wall 40 at the near side of theescape aperture 44. The curve of theouter wall 40 may allow the abrasive to pass through theescape aperture 44 on the path of the tangent. - In use, the
centrifuge media separator 30 may be attached to the blower as mentioned above. The blower creates an area of low pressure adjacent thecentral opening 36. The area of low pressure draws air into theinlet 34. As was earlier mentioned, the air contains a combination ofblast particulate 18 andfine particulate 20. Because thecentrifuge media separator 30 is configured such that theair passageway 32 circles about itself, particulate having a density greater than the air (i.e., the blast particulate 18) tends to be centrifugally directed toward, theouter wall 40. The blast particulate 18 may circulate within thecentrifuge media separator 30 in a sliding manner against theouter wall 40. - When the
blast particulate 18 reaches theescape aperture 44, theblast particulate 18 may be directed to theescape aperture 44 by theair foil 50, and exhausted from theair passageway 32. If noblast particulate 18 is exhausted through theescape aperture 44, it may be because theblast particulate 18 has a relatively lower mass, and is travelling in the air flow too far away from theouter wall 40 to be directed to theescape aperture 44 by theair foil 50. Theair foil 50, and specifically, theblade 35, may be adjusted by loosening themechanical fasteners 66 and sliding theblade 35 to extend further in to thepassageway 32, then retightening the one or moremechanical fasteners 66. Anair foil 50 which extends further in to thepassageway 32 will capture lower mass blast particulate. A pressure, differential may exist between an inside and outside of theair passageway 32 at an area adjacent theescape aperture 44. As discussed above, the air foil may 50 extend in to theair passageway 32 some distance at an angle. When the air flowing through theair passageway 32 contacts theblade 35, the air will change direction, and the change in direction will reduce the velocity of the air. The reduced velocity air will be at a pressure higher than the air in theair passageway 32 moving at a constant velocity or than air that is accelerating in theair passageway 32. The air exterior to thepassageway 32 may have a lower pressure compared to that on the inside of theair passageway 32, and even lower than the air in the vicinity of theair foil 50, such that theblast particulate 18 is drawn to the outside of theair passageway 32. Once outside of theair passageway 32, gravity may draw the blast particulate 18 downwardly into a blast particulate hopper such that theblast particulate 18 can be reused. Thus, the pressure differential between the inside and outside of theair passageway 32 may be Increased with the addition of theair foil 50 such that the separating efficiency of thecentrifuge media separator 30 is enhanced. The ability to precisely adjust theair foil 50 allows flexibility in theblast particulate 18 theblast cabinet 10 may use. - Downstream of the
escape aperture 44, the air circulating through theair passageway 32 may containfine particulate 20. The air withfine particulate 20 may be drawn through thecentral opening 36 formed in theupper panel 54 due to the application of low pressure by the blower. The air may pass under and around theinner wall 42 such that it may be drawn upwardly through thecentral opening 36. The low pressure may be sufficient to draw air withfine particulate 20 through thecentral opening 36 but not insufficient to draw the blast particulate 18 therethrough. As such, theblast particulate 18 downstream of theescape aperture 44 may be recirculated through theair passageway 32 and redirected back to theinlet 34 such that theblast particulate 18 might pass through theescape aperture 44. - The above description is given by way of example, and not limitation. Given the above disclosure, one skilled in the art could devise variations that are within the scope and spirit of the invention disclosed herein, including various ways of attaching the blade to the bracket. Further, the various features of the embodiments disclosed herein can be used alone, or in varying combinations with each other and are not intended to be limited to the specific combination described herein. Thus, the scope of the claims is not to be limited by the illustrated embodiments.
Claims (20)
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US15/858,919 US20190201828A1 (en) | 2017-12-29 | 2017-12-29 | Adjustable abrasive & dust separator |
US17/384,105 US11633685B2 (en) | 2017-12-29 | 2021-07-23 | Adjustable abrasive and dust separator |
US18/186,423 US20230226477A1 (en) | 2017-12-29 | 2023-03-20 | Adjustable abrasive and dust separator |
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US18/186,423 Pending US20230226477A1 (en) | 2017-12-29 | 2023-03-20 | Adjustable abrasive and dust separator |
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-
2017
- 2017-12-29 US US15/858,919 patent/US20190201828A1/en not_active Abandoned
-
2021
- 2021-07-23 US US17/384,105 patent/US11633685B2/en active Active
-
2023
- 2023-03-20 US US18/186,423 patent/US20230226477A1/en active Pending
Cited By (2)
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US10981259B2 (en) * | 2016-05-05 | 2021-04-20 | Wazer Inc. | Waterjet systems and methods |
CN116619248A (en) * | 2023-07-19 | 2023-08-22 | 盐城市三友除锈设备有限公司 | Dust removing device for non-closed rust remover |
Also Published As
Publication number | Publication date |
---|---|
US11633685B2 (en) | 2023-04-25 |
US20230226477A1 (en) | 2023-07-20 |
US20210402340A1 (en) | 2021-12-30 |
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