EP0253177A2 - Pulveraufnahmesystem mit mehreren Auslässen für thermische Spritzpistolen - Google Patents

Pulveraufnahmesystem mit mehreren Auslässen für thermische Spritzpistolen Download PDF

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Publication number
EP0253177A2
EP0253177A2 EP87109249A EP87109249A EP0253177A2 EP 0253177 A2 EP0253177 A2 EP 0253177A2 EP 87109249 A EP87109249 A EP 87109249A EP 87109249 A EP87109249 A EP 87109249A EP 0253177 A2 EP0253177 A2 EP 0253177A2
Authority
EP
European Patent Office
Prior art keywords
powder
tube
conduit structure
openings
bores
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.)
Withdrawn
Application number
EP87109249A
Other languages
English (en)
French (fr)
Inventor
Mark F. Spaulding
Gunther Hain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Applied Biosystems Inc
Original Assignee
Perkin Elmer Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Perkin Elmer Corp filed Critical Perkin Elmer Corp
Publication of EP0253177A2 publication Critical patent/EP0253177A2/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • B05B7/1445—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means involving vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1463—Arrangements for supplying particulate material the means for supplying particulate material comprising a gas inlet for pressurising or avoiding depressurisation of a powder container

Definitions

  • This invention relates to a powder pickup and feeding system for thermal spray guns.
  • Thermal spraying sometimes also referred to as flame spraying, involves the heat-softening of a heat-fusible material, such as a metal or ceramic and the propelling of the softened material in particulate form against a surface to be coated to which the heat-fusible material bonds.
  • a flame spray gun is usually used for this purpose and the heat-fusible material may be supplied in powder form to the gun.
  • the powder is of quite small particle size, e.g. below about 100 mesh U. S. Standard screen size, and as small as one micron, and is difficult to meter and control.
  • a flame spray gun normally utilizes a combustion or plasma flame to effect melting of the powder, but other heating means, such as electric arcs, resistance heaters or induction heaters can also be used, alone or in combination.
  • the carrier gas for the powder can be one of the combustion gases or compressed air.
  • the carrier gas is generally the same as the primary plasma gas, although other gases such as hydrocarbons are used in special cases.
  • Another object of the invention is to provide for greater convenience and economy and simplicity in multiple outlet powder pickup systems by providing a unitary multiple outlet powder pickup element structure having a plurality of separate carrier gas bores which is interchangeable with a single bore powder pickup within a powder delivery tank structure designed for a single conduit.
  • Another object of the invention is to provi an improved powder pickup system incorporating a carrier conduit structure having a single carrier gas inlet and an interior plenum connected to a plurality of separate carrier gas bores for delivery to separate outlet connections.
  • Another object of the invention is to provide a multiple bore powder pickup element structure which provides matched pickups with closely spaced inlets in order to assure balanced delivery of powdered coating materials.
  • a powder pick-up system for thermal spray guns comprising an enclosed hopper for a powder to be thermally sprayed in loose particulate form, a feed gas conduit adapted to discharge a regulated amount of feed gas under pressure into the hopper, a unitary carrier conduit structure powder pickup device having a single carrier gas inlet and a plenum connected to said inlet with a plurality of separate carrier gas bores connected to receive gas from said plenum, separate outlet connections from each of said bores for separate delivery of gas-entrained powder to at least one spray gun, said conduit structure including at least one opening through wall thereof from each o said bores into the interior of said hopper for picking up powder therefrom.
  • a powder pickup system for thermal spray guns which includes an enclosed hopper 10 for powder to be thermally sprayed in loose particulate form by a spray gun schematically illustrated at 12.
  • the system is provided with gas under carefully controlled pressure and with carefully controlled flow rates by gas delivery and control apparatus, not shown. Such apparatus may be combined with other controls for the spray gun 12.
  • FIG. 2 is a side view, partly in section, of the system of Fig. 1. As shown more clearly in Fig. 2, the system includes a feed gas conduit connection, indicated at 14, which is adapted to introduce a regulated amount of feed gas under pressure into the hopper 10.
  • the unitary carrier conduit structure 16 receives carrier gas from a single carrier gas inlet 18, as shown in Fig. 2.
  • the unitary carrier conduit structure 16 includes separate outlet connections, indicated as 20 and 22 for separate delivery of gas entrained powder to a spray gun indicated schematically at 12 through extended conduits indicated schematically at 24 and 26.
  • the separate outlet connections are preferably from separate tubes 28 and 30 which define separate bores for the separate delivery of gas entrained powder.
  • Figure 2A is an enlarged detail view showing a cross section of the lower housing of the hopper structure 10 of Figs. 1 and 2.
  • the tubes 28 and 30 extend through a flanged hub 32 and into an inlet coupling 34.
  • the entire unitary carrier conduit structure fits within a housing bore, and the inlet coupling 34 includes a ring seal 36 which provides a gas-tight seal with the interior surface of the housing bore.
  • the seal 36 and the axial end face of the inlet coupling 34 and the walls of the housing bore together form a plenum for the supply of gas under pressure from the single inlet 18 to both of the carrier gas bores of the tubes 28 and 30.
  • the structure of the inlet coupling 34 is more clearly shown in Figs. 3 and 3A and described further below in connection with those figures.
  • Each of the tubes 28 and 30 includes an opening through the tube wall, as indicated at 38 in tube 28 and 38A in tube 30 for the introduction of gas entrained powder from the hopper.
  • the hopper structure preferably includes a porous disk-shaped member 40 at the gas inlet to the bottom of the hopper from the inlet connection 14 to diffuse the feed gas into the hopper and to block backflow of powder into the feed gas conduit in the absence of feed gas flow.
  • the feed gas supplied through the inlet 14 and the porous member 40 fluidizes powder in the bottom part of the hopper, preferably fluidizing only a portion of the powder near openings 38 and 38A. A part of that fluidized powder is aspirated through the wall opening 38 into the bore of the tube 28. It will be understood that an opening corresponding to opening 38 is provided in tube 30 (Fig. 3), but tube 30 is not visible in Figs.
  • the hopper is preferably provided with a vibrator motor in the bottom of the hopper housing as indicated at 42.
  • the hopper 10 is preferably provided with a removable cover 44 for convenience in refilling the hopper (Fig. 1).
  • the cover 44 preferably includes a gas inlet fitting 46 through which pressurizing gas may be added at the top of the hopper so that the pressurization of the entire volume of the hopper need not be provided solely from the inlet 14. This speeds up the initial startup of operations after the hopper has been previously depressurized.
  • Fig. 3 there is shown a top view, partially in section, of the unitary carrier conduit structure 16.
  • the respective tubes 28 and 30 are sectioned, and the opening 38 through the bottom of the wall of the tube 28 is clearly shown, as is the corresponding opening 38A in tube 30.
  • the inlet coupling 34 is also sectioned in order to more clearly show the structure of that coupling, and particularly the structure of the axial end face of that inlet coupling.
  • the two tubes 28 and 30 are securely attached together by the end coupling 34 and the flanged hub 32 to form the unitary carrier conduit structure (powder pickup device).
  • the inlet coupling member 34 includes an axial end face 48 which is recessed in an axial direction, the end face including an axially extended rim portion 50 to partially define the plenum and to assure a minimum axial dimension for the plenum.
  • Fig. 3A is a left end view of the structure illustrated in Fig. 3, which more clearly shows the recessed face 48, the rim portion 50 and the bore openings from the face 48 into the respective tubes 28 and 30.
  • Fig. 3B is an enlarged detail, partly in section, showing the preferred construction of the inlet coupling portion of the powder pickup device of Fig. 3.
  • the undercut tips of the ends of the tubes 28 and 30 extending into the associated recesses in the end coupling 34 permit space for brazing material by which the parts are permanently joined.
  • Figure 4 is a top view corresponding to the view of Fig. 3 and illustrating a modified embodiment of the unitary carrier conduit structure powder pickup device which incorporates further principles taught in the aforementioned U. S. Patent 4,561,808.
  • this embodiment instead of providing a single wall opening in the bottom of each tube, two side wall openings are provided in each tube which are arranged substantially horizontally, as indicated at 52 and 54 for tube 28A, and at 56 and 58 for tube 30A.
  • the ports 52-58 are each directed at an acute angle with respect to the axis of the bore. As illustrated in the drawing, the angle of each of the openings 52-58 is slanted back towards the inlet end of the powder pickup device.
  • each opening port 52-58 makes with the associated axis of the tube is preferably about 45 degrees.
  • the members of each pair of ports are substantially parallel to one another.
  • the separation between the adjacent ports 52-54 and 56-58 is preferably between about one and about ten times the average diameter of the tube bore where the openings intersect with the tube bore.
  • each tube in accordance with the teachings of the above-mentioned patent 4,561,808 is that there is provided a constricted section of the tube downstream from the inlet ports 52-58. That constriction is indicated at 60 in tube 28, and at 62 in tube 38. Beyond the restricted portions 60 and 62, on the downstream side, each bore increases again in a stepwise manner, to the original bore size, as indicated at 64 and 66. It will be understood that the constrictions 60 and 62 are exaggerated in the drawing of Fig. 4 in order to promote clarity in the presentation of the principles involved.
  • this arrangement provides for a substantially increased uniformity in powder pickup and delivery, especially with materials which are difficult to feed.
  • each of the tubes 28,30 and 28A,30A of both embodiments may be relatively thick-walled tubes as illustrated in Fig. 3B, having relatively thicker walls than indicated by the other drawings.
  • the structures are shown with relatively thin walls in the other drawings in order to promote an understanding of the invention and to present the details with greater clarity.
  • the greater wall thickness is particularly important in connection with the embodiment of Fig. 4 since the length of the passages of the ports 52-58 is important in conjunction with the rest of the geometry of the structure in promoting the desired result.
  • each of the powder pickup devices (16, 16A) of the invention is firmly secured in the associated hopper housing structure by means of the flange portion of the flanged hub 32.
  • the flanged portion is secured to the hopper body by means such as threaded screw fastenings which are inserted through the openings indicated at 68 and 70 in Fig. 3A.
  • the openings 68 and 70 are purposely positioned at an angle of less than 180 degrees away from one another with respect to the center of the structure so that it will be apparent to the operator that there is only one correct vertical alignment of the powder pickup device in the assembled position.
  • each of the powder entrainment openings in tubes 28, 30 and 28A, 30A should open generally downwardly to prevent excessive influence by gravity on the flow, but the orifice opening need not point straight down. It is preferred that the geometric design and arrangement of the orifice be such that there is no gravity flow of the powder through the orifice into the carrier gas stream in the absence of fluidizing gas flow.
  • the orifice can be side-facing or even partially upwardly facing.
  • the orifice can be in a relatively thick tube wall, or can consist of a short length of tube extending sideways to prevent the powder, with its particular angle of repose, from entering the conduit.
  • the openings may be upwardly directed with a shed interpose in spaced relationship above each opening to prevent gravity flow of powder into the openings as described in aforementioned U. S. Patent 4,582,254.
  • the hopper 10 and the associated housing including the lower housing portion containing the housing bore into which the powder pickup device is fitted, is very similar to a housing which has been used with a single bore powder pickup device in the past, and this same housing may be employed with a single bore powder pickup device. Accordingly, it is one of the important advantages of the invention that a very simple conversion can be made between a single bore powder pickup system and a multiple bore powder pickup system by interchanging multiple and single bore powder pickup elements in the same hopper structure.
  • the same single inlet connection 18 may be employed with either powder pickup device, and it is only necessary to deal with the change between one and two powder outlets in terms of required changes in powder conduit connections.
  • Another major advantage of the invention is that the two powder pickup elements formed by the two tubes 28 and 30 are very closely positioned together within the hopper so that they both pick up fluidized powder from the hopper at substantially the same position within the hopper. This leads to substantial uniformity of the mixture of gas and powder in the two conduits. That condition promotes high quality coatings in the operation of the thermal spray gun 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP87109249A 1986-07-10 1987-06-26 Pulveraufnahmesystem mit mehreren Auslässen für thermische Spritzpistolen Withdrawn EP0253177A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US88415986A 1986-07-10 1986-07-10
US884159 1986-07-10

Publications (1)

Publication Number Publication Date
EP0253177A2 true EP0253177A2 (de) 1988-01-20

Family

ID=25384087

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109249A Withdrawn EP0253177A2 (de) 1986-07-10 1987-06-26 Pulveraufnahmesystem mit mehreren Auslässen für thermische Spritzpistolen

Country Status (4)

Country Link
EP (1) EP0253177A2 (de)
JP (1) JPS6323763A (de)
CN (1) CN87104798A (de)
BR (1) BR8703407A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9242422B2 (en) 2011-06-16 2016-01-26 Von Arx Ag Quick-connect coupling
US9434119B2 (en) 2011-06-16 2016-09-06 Von Arx Ag Quick-connect coupling

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9242422B2 (en) 2011-06-16 2016-01-26 Von Arx Ag Quick-connect coupling
US9434119B2 (en) 2011-06-16 2016-09-06 Von Arx Ag Quick-connect coupling

Also Published As

Publication number Publication date
JPS6323763A (ja) 1988-02-01
BR8703407A (pt) 1988-03-22
CN87104798A (zh) 1988-01-27

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