WO2011032906A1 - Rotary device and method for transmitting material - Google Patents

Rotary device and method for transmitting material Download PDF

Info

Publication number
WO2011032906A1
WO2011032906A1 PCT/EP2010/063364 EP2010063364W WO2011032906A1 WO 2011032906 A1 WO2011032906 A1 WO 2011032906A1 EP 2010063364 W EP2010063364 W EP 2010063364W WO 2011032906 A1 WO2011032906 A1 WO 2011032906A1
Authority
WO
WIPO (PCT)
Prior art keywords
opening
rotary device
bell
shaped member
slot
Prior art date
Application number
PCT/EP2010/063364
Other languages
French (fr)
Inventor
Dau Binh Chiu
Original Assignee
Dau Binh Chiu
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 Dau Binh Chiu filed Critical Dau Binh Chiu
Publication of WO2011032906A1 publication Critical patent/WO2011032906A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1092—Means for supplying shaping gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1007—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member
    • B05B3/1014—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • This invention relates to a rotary device and to a method for transmitting material.
  • the device and the method may be used for transmitting material, such as paint, for example in particulate form, for deposition on a target surface.
  • Rotary devices are known, for example from EP-A-0780159, in the form of electrostatically controlled devices for transmitting a beam of material in particulate form at a target surface to be coated, the device comprising a bell-shaped member which is rotatable about a principal axis and arranged to project a conical curtain of small particles flowing generally towards a target surface.
  • a high-voltage electrostatic charge is applied between the target surface and the particles to assist in directing the particles towards the target surface.
  • the material to be deposited such as paint
  • Such rotary devices are often mounted on the end of a robot arm and the robot arm is provided within a spray booth.
  • the electrostatic charge not only directs the particles towards the target surface, but additionally minimises the deposition of particles on surfaces other than the target surface, such as parts of the rotary device not directly in contact with the particles, the robot arm and the interior of the spray booth. It would be advantageous to be able to minimise the deposition of particles on surfaces other than the target surface without using a high-voltage electrostatic charge, which is costly to produce and potentially dangerous.
  • a rotary device for transmitting material comprising: a body having a substantially conical surface; a bell-shaped member mounted in the body and rotatable about an axis relative to the body, the bell-shaped member being formed with a substantially conical surface adjacent to and spaced from the substantially conical surface of the body so as to form a first flow path for air in the device; means for providing a flow of air along the first flow path; at least one first opening provided in the conical surface of the body for directing air at the substantially conical surface of the bell-shaped member along a second flow path which intersects with the first flow path; and at least one second opening provided spaced radially outside the at least one first opening for directing air along a third flow path.
  • the at least one first opening may be a single opening, for example in the form of a slot which extends around the entire periphery of the bell-shaped member.
  • the width of the slot may be varied, for example by providing opposite sides of the slot in different concentric members which are movable axially relative to each other, for example by way of a thread.
  • the at least one first opening may comprise a plurality of openings, for example circular, slot or square form, spaced around the periphery of the bell-shaped member.
  • the at least one second opening may be provided in a substantially
  • the at least one second opening may be provided in a radial surface.
  • the at least one second opening may be provided separately from the body, for example as a toroidal member positioned around the bell-shaped member.
  • the at least one second opening may be a single opening, for example in the form of a slot which extends around the periphery of the at least one first opening.
  • the width of the slot forming the second opening may be varied, for example by providing opposite sides of the slot in different concentric members which are movable axially relative to each other and which form the slot of the second opening, for example by way of a thread.
  • the at least one second opening may comprise a plurality of openings, for example circular, slot or square form, spaced around the at least one first opening.
  • the at least one second opening may be directed at an angle in the range from 15 to 80 degrees, preferably 20 to 70 degrees and ideally about 30 degrees, relative to the axial direction of the bell-shaped member.
  • At least one third opening for the passage of air may be provided in a region radially within the rotatable bell-shaped member.
  • the third opening may be provided between the bell-shaped member and a stationary central support member, or may be provided in the stationary central support member.
  • a nozzle for the material to be transmitted may be provided in the central support member.
  • the opening may be a single annular opening or may comprise a plurality of openings, for example circular, slot or square form, spaced around the nozzle.
  • a method for transmitting material employing a rotary device as hereinbefore defined, the method comprising the steps of: providing the material to be transmitted so as to be atomised through rotation of the bell-shaped member; entraining the atomised material in a first substantially conical curtain of air formed by air flowing along the first flow path and by air from the at least one first opening and flowing along the second flow path intersecting with the first flow path; and providing a second substantially conical curtain of air along the third flow path around the periphery of the first curtain for limiting the spread of the atomised material.
  • the inner and outer curtains of air may merge to create a substantially conical vortex which rotates about the axis of the bell-shaped member so as to create a region in the vicinity of the bell-shaped member which has a lower pressure than the pressure externally of the air flowing along the first, second and third flow paths.
  • the rotary device for transmitting material shown in the figure is generally of conventional construction, for example as described in EP-A-0 780 159, except that no apparatus is necessary for generating a high-voltage electrostatic charge, although this may be provided as an option, and means is provided for providing inner and outer air curtains for shaping and directing a conical curtain of coating material towards a surface 1 to be coated, the surface 1 being shown diagrammatically.
  • a rotatable bell-shaped member 3 is provided, the bell-shaped member being rotatable about its principle axis at speeds from 5000 to 100000 rpm, using, for example, air bearings or ball bearings, in order to create an atomised coating material.
  • the bell-shaped member being rotatable about its principle axis at speeds from 5000 to 100000 rpm, using, for example, air bearings or ball bearings, in order to create an atomised coating material.
  • the bell-shaped member 3 is rotatable by means of an air-driven turbine 19.
  • the bell-shaped member 3 is rotatably mounted on a stationary central support member 23 through which passes an outlet nozzle 17 for material which is to be directed towards the surface 1 to be coated, and is mounted within a stationary body 5 which is formed with a substantially conical surface 7 adjacent to, but spaced from an external substantially conical surface 9 of the bell-shaped member 3.
  • the conical surfaces 7 and 9 both expand towards the outer end of the device.
  • a further channel 25 for the passage of air is provided between the central support member 23 and the rotatable bell-shaped member 3.
  • a channel 27 for the passage of air is provided between the central support member 23 and the nozzle 17 for the material to be directed towards the surface 1 to be coated.
  • the channel 25 or 27 provides an additional supply of air which may be used particularly in the event the material contains large particles.
  • One or more openings 1 1 is or are provided in the conical surface 7 so as to direct shaping air along a flow path towards the bell-shaped member 3, especially the conical surface 9 thereof.
  • the one or more openings 1 1 may be a single opening in the form of a slot which extends around the entire periphery of the bell-shaped member.
  • the one or more openings may comprise a plurality of openings, for example of circular, slot or square form, spaced around the periphery of the bell-shaped member 3.
  • the width of the slot may be varied, for example by providing opposite sides of the slot in different concentric members which are movable axially relative to each other, for example by way of a thread.
  • the opening or openings 1 1 is or are directed towards the bell-shaped member 3, especially the conical surface 9 thereof.
  • the opening or openings may be at a specific angle relative to the axis of the bell-shaped member 3.
  • the angle may be in a range of 10 to 75 degrees relative to the axial direction, preferably in a range 20 to 70 degrees and ideally at an angle of substantially 60 degrees to the axial direction.
  • other angles may be employed.
  • one or more openings 13 is or are provided spaced radially outside the opening or openings 1 1.
  • the opening or openings 13 may be provided in a substantially conical surface 15 which contracts towards the free end of the device. That is, the conical surfaces 7 and 15 are in opposite senses and converge towards each other towards the end of the device. It is not essential that surface 15 is conical: as an alternative, surface 15 may be radial. As a further alternative, the opening or openings 13 may be separate from the body 5, for example provided in a toroidal member which is positioned around the bell-shaped member 3.
  • the one or more openings 13 is or are provided in the conical surface 15 so as to form a conical outer air curtain along a flow path which contributes towards controlling the flow of atomised particles towards the surface 1 to be coated. Consequently, the inner air curtain and the outer air curtain co-operate to form concentric cones of air which control the flow of the atomised particles towards the surface 1 and constrain the spread of the atomised particles.
  • the one or more openings 13 may be a single opening in the form of a slot which extends around the entire periphery of the opening(s) 1 1.
  • the one or more openings 13 may comprise a plurality of openings, for example of circular, slot or square form, spaced around the periphery of the opening(s) 1 1.
  • the width of the slot may be varied, for example by providing opposite sides of the slot in different concentric members which are movable axially relative to each other, for example by way of a thread.
  • the opening or openings 13 is or are ideally directed at a specific angle relative to the axis of the bell-shaped member 3.
  • the angle is in a range of 15 to 80 degrees relative to the axial direction, preferably in a range 20 to 70 degrees and ideally at an angle of substantially 30 degrees to the axial direction.
  • Air may be supplied to the opening or openings 1 1 , 13 in the form of clean, dry air at a pressure of up to about 8 bar, while the material which is to be directed towards the surface 1 to be coated may be at a pressure of about 1 bar.
  • the rotation of the vortex resulting from the inner and outer air curtains creates a region within the air curtains, that is in the region of the bell-shaped member 3, which has in use a lower pressure than the pressure externally of the air curtains.
  • the pressure differential helps to propel the atomised particles particularly efficiently towards the surface to be coated without the need for a high-voltage electrostatic charge.
  • the relative flow rates of air can be controlled in any suitable manner, such as by controlling the pressure of the various air sources as well as by controlling the cross-sectional areas of the various openings.
  • the use of the inner and outer air curtains has a further benefit in that it is possible to keep the device, externally of the bell-shaped member 3, clean as well as any additional spray equipment and spray booth without the need for a high-voltage electrostatic charge.

Abstract

A rotary device for transmitting material comprises a body (5) having a substantially conical surface (7), and a bell-shaped member (3) mounted in the body (5) and rotatable about an axis relative to the body (5). The bell-shaped member (3) is formed with a substantially conical surface (9) adjacent to and spaced from the substantially conical surface (7) of the body (5) so as to form a first flow path for air in the device. Means (19) is also included for providing a flow of air along the first flow path. At least one first opening (11) is provided in the conical surface (7) of the body (5) for directing air at the substantially conical surface (9) of the bell-shaped member (3) along a second flow path which intersects with the first flow path. At least one second opening (13) is provided spaced radially outside the at least one first opening (11) for directing air along a third flow path.

Description

Description
ROTARY DEVICE AND METHOD FOR TRANSMITTING MATERIAL
[0001] This invention relates to a rotary device and to a method for transmitting material. The device and the method may be used for transmitting material, such as paint, for example in particulate form, for deposition on a target surface.
[0002] Rotary devices are known, for example from EP-A-0780159, in the form of electrostatically controlled devices for transmitting a beam of material in particulate form at a target surface to be coated, the device comprising a bell-shaped member which is rotatable about a principal axis and arranged to project a conical curtain of small particles flowing generally towards a target surface. A high-voltage electrostatic charge is applied between the target surface and the particles to assist in directing the particles towards the target surface.
[0003] Generally the material to be deposited, such as paint, will be a liquid or suspension, but other suspended materials, solids and powders can be handled in this way dependent on the application provided they are able to be in particulate form when airborne.
[0004] Such rotary devices are often mounted on the end of a robot arm and the robot arm is provided within a spray booth. The electrostatic charge not only directs the particles towards the target surface, but additionally minimises the deposition of particles on surfaces other than the target surface, such as parts of the rotary device not directly in contact with the particles, the robot arm and the interior of the spray booth. It would be advantageous to be able to minimise the deposition of particles on surfaces other than the target surface without using a high-voltage electrostatic charge, which is costly to produce and potentially dangerous.
[0005] It is therefore an object of the present invention to provide a rotary device and a method for transmitting material which overcomes, or at least ameliorates, the above disadvantages.
[0006] According to one aspect of the present invention there is provided a rotary device for transmitting material, the device comprising: a body having a substantially conical surface; a bell-shaped member mounted in the body and rotatable about an axis relative to the body, the bell-shaped member being formed with a substantially conical surface adjacent to and spaced from the substantially conical surface of the body so as to form a first flow path for air in the device; means for providing a flow of air along the first flow path; at least one first opening provided in the conical surface of the body for directing air at the substantially conical surface of the bell-shaped member along a second flow path which intersects with the first flow path; and at least one second opening provided spaced radially outside the at least one first opening for directing air along a third flow path.
[0007] The at least one first opening may be a single opening, for example in the form of a slot which extends around the entire periphery of the bell-shaped member. The width of the slot may be varied, for example by providing opposite sides of the slot in different concentric members which are movable axially relative to each other, for example by way of a thread.
[0008] Alternatively, the at least one first opening may comprise a plurality of openings, for example circular, slot or square form, spaced around the periphery of the bell-shaped member.
[0009] The at least one second opening may be provided in a substantially
conical surface which contracts towards the free end of the device.
Alternatively, the at least one second opening may be provided in a radial surface. As a further alternative, the at least one second opening may be provided separately from the body, for example as a toroidal member positioned around the bell-shaped member.
[0010] The at least one second opening may be a single opening, for example in the form of a slot which extends around the periphery of the at least one first opening. The width of the slot forming the second opening may be varied, for example by providing opposite sides of the slot in different concentric members which are movable axially relative to each other and which form the slot of the second opening, for example by way of a thread.
[001 1] Alternatively, the at least one second opening may comprise a plurality of openings, for example circular, slot or square form, spaced around the at least one first opening.
[0012] The at least one second opening may be directed at an angle in the range from 15 to 80 degrees, preferably 20 to 70 degrees and ideally about 30 degrees, relative to the axial direction of the bell-shaped member.
[0013] At least one third opening for the passage of air may be provided in a region radially within the rotatable bell-shaped member. The third opening may be provided between the bell-shaped member and a stationary central support member, or may be provided in the stationary central support member.
[0014] A nozzle for the material to be transmitted may be provided in the central support member. Where the at least one third opening is provided in the central support member, the opening may be a single annular opening or may comprise a plurality of openings, for example circular, slot or square form, spaced around the nozzle.
[0015] According to another aspect of the present invention there is provided a method for transmitting material employing a rotary device as hereinbefore defined, the method comprising the steps of: providing the material to be transmitted so as to be atomised through rotation of the bell-shaped member; entraining the atomised material in a first substantially conical curtain of air formed by air flowing along the first flow path and by air from the at least one first opening and flowing along the second flow path intersecting with the first flow path; and providing a second substantially conical curtain of air along the third flow path around the periphery of the first curtain for limiting the spread of the atomised material.
[0016] The inner and outer curtains of air may merge to create a substantially conical vortex which rotates about the axis of the bell-shaped member so as to create a region in the vicinity of the bell-shaped member which has a lower pressure than the pressure externally of the air flowing along the first, second and third flow paths.
[0017] For a better understanding of the present invention and to show more clearly how it may be carried into effect reference will now be made, by way of example, to the accompanying figure which is a side view, partly in cross-section, of one embodiment of a rotary device for transmitting material according to the present invention.
[0018] The rotary device for transmitting material shown in the figure is generally of conventional construction, for example as described in EP-A-0 780 159, except that no apparatus is necessary for generating a high-voltage electrostatic charge, although this may be provided as an option, and means is provided for providing inner and outer air curtains for shaping and directing a conical curtain of coating material towards a surface 1 to be coated, the surface 1 being shown diagrammatically.
[0019] As shown in the figure, a rotatable bell-shaped member 3 is provided, the bell-shaped member being rotatable about its principle axis at speeds from 5000 to 100000 rpm, using, for example, air bearings or ball bearings, in order to create an atomised coating material. In the illustrated
embodiment, the bell-shaped member 3 is rotatable by means of an air-driven turbine 19. The bell-shaped member 3 is rotatably mounted on a stationary central support member 23 through which passes an outlet nozzle 17 for material which is to be directed towards the surface 1 to be coated, and is mounted within a stationary body 5 which is formed with a substantially conical surface 7 adjacent to, but spaced from an external substantially conical surface 9 of the bell-shaped member 3. The conical surfaces 7 and 9 both expand towards the outer end of the device.
[0020] Exhaust air from the turbine 19 and/or from air bearings, where provided, passes along channels within the body 5, such as channel 21 , and exits the device through a flow path provided by the annular space between the outer surface of the bell-shaped member 3 and the body 5. If neither a turbine nor air bearings are employed, or if the air they consume is not employed, a separate source of air is provided to create a flow of air through the annular space between the bell-shaped member 3 and the body 5.
[0021] A further channel 25 for the passage of air is provided between the central support member 23 and the rotatable bell-shaped member 3. In an alternative embodiment (not shown) in which the rotatable bell-shaped member 3 is integral with the rotatable central support member 23, a channel 27 for the passage of air is provided between the central support member 23 and the nozzle 17 for the material to be directed towards the surface 1 to be coated. The channel 25 or 27 provides an additional supply of air which may be used particularly in the event the material contains large particles.
[0022] One or more openings 1 1 is or are provided in the conical surface 7 so as to direct shaping air along a flow path towards the bell-shaped member 3, especially the conical surface 9 thereof. The one or more openings 1 1 may be a single opening in the form of a slot which extends around the entire periphery of the bell-shaped member. Alternatively, the one or more openings may comprise a plurality of openings, for example of circular, slot or square form, spaced around the periphery of the bell-shaped member 3.
[0023] Where a single slot 1 1 is provided, the width of the slot may be varied, for example by providing opposite sides of the slot in different concentric members which are movable axially relative to each other, for example by way of a thread.
[0024] As explained above, the opening or openings 1 1 is or are directed towards the bell-shaped member 3, especially the conical surface 9 thereof. Where the bell-shaped member has an included angle in the region of 60 degrees as illustrated, the opening or openings may be at a specific angle relative to the axis of the bell-shaped member 3. The angle may be in a range of 10 to 75 degrees relative to the axial direction, preferably in a range 20 to 70 degrees and ideally at an angle of substantially 60 degrees to the axial direction. However, other angles may be employed.
[0025] In use of the device, with the bell-shaped member rotating at high speed, the flow of air between the bell-shaped member 3 and the body 5 interacts with the flow of air directed towards the bell-shaped member from the opening or openings 1 1. The result is a turbulent inner curtain of air which passes the leading edge of the bell-shaped member and flows towards the surface 1 to be coated.
[0026] Additionally, one or more openings 13 is or are provided spaced radially outside the opening or openings 1 1. The opening or openings 13 may be provided in a substantially conical surface 15 which contracts towards the free end of the device. That is, the conical surfaces 7 and 15 are in opposite senses and converge towards each other towards the end of the device. It is not essential that surface 15 is conical: as an alternative, surface 15 may be radial. As a further alternative, the opening or openings 13 may be separate from the body 5, for example provided in a toroidal member which is positioned around the bell-shaped member 3.
[0027] The one or more openings 13 is or are provided in the conical surface 15 so as to form a conical outer air curtain along a flow path which contributes towards controlling the flow of atomised particles towards the surface 1 to be coated. Consequently, the inner air curtain and the outer air curtain co-operate to form concentric cones of air which control the flow of the atomised particles towards the surface 1 and constrain the spread of the atomised particles.
[0028] While the inner and outer curtains are initially separate, with increasing distance from the device they merge and create a generally conical vortex which rotates about the axis of the bell-shaped member 3.
[0029] The one or more openings 13 may be a single opening in the form of a slot which extends around the entire periphery of the opening(s) 1 1.
Alternatively, the one or more openings 13 may comprise a plurality of openings, for example of circular, slot or square form, spaced around the periphery of the opening(s) 1 1.
[0030] Where a single slot 13 is provided, the width of the slot may be varied, for example by providing opposite sides of the slot in different concentric members which are movable axially relative to each other, for example by way of a thread.
[0031] The opening or openings 13 is or are ideally directed at a specific angle relative to the axis of the bell-shaped member 3. The angle is in a range of 15 to 80 degrees relative to the axial direction, preferably in a range 20 to 70 degrees and ideally at an angle of substantially 30 degrees to the axial direction.
[0032] Air may be supplied to the opening or openings 1 1 , 13 in the form of clean, dry air at a pressure of up to about 8 bar, while the material which is to be directed towards the surface 1 to be coated may be at a pressure of about 1 bar.
[0033] In practice, the rotation of the vortex resulting from the inner and outer air curtains creates a region within the air curtains, that is in the region of the bell-shaped member 3, which has in use a lower pressure than the pressure externally of the air curtains. The pressure differential helps to propel the atomised particles particularly efficiently towards the surface to be coated without the need for a high-voltage electrostatic charge. The relative flow rates of air can be controlled in any suitable manner, such as by controlling the pressure of the various air sources as well as by controlling the cross-sectional areas of the various openings.
The use of the inner and outer air curtains has a further benefit in that it is possible to keep the device, externally of the bell-shaped member 3, clean as well as any additional spray equipment and spray booth without the need for a high-voltage electrostatic charge.

Claims

Claims
1. A rotary device for transmitting material, the device comprising: a body (5) having a substantially conical surface (7); a bell-shaped member (3) mounted in the body and rotatable about an axis relative to the body, the bell-shaped member being formed with a substantially conical surface (9) adjacent to and spaced from the substantially conical surface of the body so as to form a first flow path for air in the device; means (19) for providing a flow of air along the first flow path; at least one first opening (1 1) provided in the conical surface of the body for directing air at the substantially conical surface of the bell-shaped member along a second flow path which intersects with the first flow path; and at least one second opening (13) provided spaced radially outside the at least one first opening for directing air along a third flow path.
2. A rotary device as claimed in claim 1 , wherein the at least one first opening (1 1 ) comprises a single opening.
3. A rotary device as claimed in claim 2, wherein the single opening (1 1 ) is in the form of a slot which extends around the entire periphery of the bell-shaped member (3).
4. A rotary device as claimed in claim 3, wherein the width of the slot (1 1 ) can be varied.
5. A rotary device as claimed in claim 4, wherein the width of the slot (1 1 ) can be varied by providing opposite sides of the slot in different concentric members which are movable axially relative to each other.
6. A rotary device as claimed in claim 5, wherein the different concentric
members are movable axially relative to each other by way of a thread.
7. A rotary device as claimed in claim 1 , wherein the at least one first opening (1 1 ) comprises a plurality of openings spaced around the periphery of the bell-shaped member (3).
8. A rotary device as claimed in claim 7, wherein the first openings (1 1 ) are
selected from circular, slot and square form.
9. A rotary device as claimed in any preceding claim, wherein the at least one second opening (13) is provided in a substantially conical surface (15) which contracts towards the free end of the device.
10. A rotary device as claimed in any one of claims 1 to 8, wherein the at least one second opening (13) is provided in a radial surface (15).
1 1. A rotary device as claimed in any one of claims 1 to 8, wherein the at least one second opening (13) is provided separately from the body (5).
12. A rotary device as claimed in claim 1 1 , wherein the at least one second
opening (13) is provided as a toroidal member positioned around the bell-shaped member (3).
13. A rotary device as claimed in any preceding claim, wherein the at least one second opening (13) comprises a single opening.
14. A rotary device as claimed in claim 13, wherein the single second opening (13) comprises a slot which extends around the periphery of the at least one first opening.
15. A rotary device as claimed in claim 14, wherein the width of the slot forming the second opening (13) can be varied.
16. A rotary device as claimed in claim 15, wherein the width of the slot forming the second opening (13) can be varied by providing opposite sides of the slot in different concentric members which are movable axially relative to each other and which form the slot of the second opening.
17. A rotary device as claimed in claim 16, wherein the different concentric
members forming the slot of the second opening (13) are movable axially relative to each other by way of a thread.
18. A rotary device as claimed in any one of claims 1 to 12, wherein the at least one second opening (13) comprises a plurality of openings spaced around the at least one first opening (1 1).
19. A rotary device as claimed in claim 18, wherein the second openings (13) are selected from circular, slot and square form.
20. A rotary devices as claimed in any preceding claim, wherein the at least one second opening (13) is directed at an angle in the range from 15 to 80 degrees relative to the axial direction of the bell-shaped member (3).
21. A rotary devices as claimed in claim 20, wherein the at least one second
opening (13) is directed at an angle in the range from 20 to 70 degrees relative to the axial direction of the bell-shaped member (3).
22. A rotary devices as claimed in claim 21 , wherein the at least one second
opening (13) is directed at an angle of about 30 degrees relative to the axial direction of the bell-shaped member (3).
23. A rotary device as claimed in any preceding claim, wherein at least one third opening (25, 27) for the passage of air is provided in a region radially within the rotatable bell-shaped member (3).
24. A rotary device as claimed in claim 23, wherein the third opening (27) is
provided between the bell-shaped member (3) and a stationary central support member (23).
25. A rotary device as claimed in claim 23, wherein the third opening (25) is
provided in a stationary central support member (23).
26. A rotary device as claimed in claim 24 or 25, wherein a nozzle (17) for the
material to be transmitted is provided in the central support member (23).
27. A rotary device as claimed in claim 25 or any claim dependent thereon,
wherein the opening (25) comprises a single annular opening.
28. A rotary device as claimed in claim 26, wherein the at least one third opening (25, 27) comprises a plurality of openings spaced around the nozzle (17).
29. A rotary device as claimed in claim 28, wherein the plurality of third openings (25, 27) are selected from circular, slot and square form.
30. A method for transmitting material employing a rotary device as claimed in any one of claims 1 to 29, the method comprising the steps of: providing the material to be transmitted so as to be atomised through rotation of the bell-shaped member (3); entraining the atomised material in a first substantially conical curtain of air formed by air flowing along the first flow path and by air from the at least one first opening (1 1) and flowing along the second flow path intersecting with the first flow path; and providing a second substantially conical curtain of air along the third flow path around the periphery of the first curtain for limiting the spread of the atomised material.
31. A method according to claim 30, wherein the inner and outer curtains of air merge to create a substantially conical vortex which rotates about the axis of the bell-shaped member (3) so as to create a region in the vicinity of the bell-shaped member which has a lower pressure than the pressure externally of the air flowing along the first, second and third flow paths.
PCT/EP2010/063364 2009-09-21 2010-09-13 Rotary device and method for transmitting material WO2011032906A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0916423A GB2469539B (en) 2009-09-21 2009-09-21 Rotary device and method for transmitting material
GB0916423.7 2009-09-21

Publications (1)

Publication Number Publication Date
WO2011032906A1 true WO2011032906A1 (en) 2011-03-24

Family

ID=41277953

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/063364 WO2011032906A1 (en) 2009-09-21 2010-09-13 Rotary device and method for transmitting material

Country Status (2)

Country Link
GB (1) GB2469539B (en)
WO (1) WO2011032906A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0780159A1 (en) 1995-12-19 1997-06-25 Toyota Jidosha Kabushiki Kaisha Rotary atomizing electrostatic coating apparatus
US20050040257A1 (en) * 2003-08-19 2005-02-24 Seitz David M. Atomizer with dedicated cleaning fluid system
WO2007000853A1 (en) * 2005-06-27 2007-01-04 Durr Japan K.K. Bell type coating device
EP1849527A2 (en) * 2006-04-28 2007-10-31 Dürr Systems GmbH Atomiser and appropriate operating method
WO2008024804A1 (en) * 2006-08-25 2008-02-28 Illinois Tool Works Inc. Bell cup cleaning system and method
FR2917309A1 (en) * 2007-06-13 2008-12-19 Sames Technologies Soc Par Act ROTATING PROJECTOR OF COATING PRODUCT AND INSTALLATION COMPRISING SUCH A PROJECTOR.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887770A (en) * 1986-04-18 1989-12-19 Nordson Corporation Electrostatic rotary atomizing liquid spray coating apparatus
US5862988A (en) * 1996-05-15 1999-01-26 Van Der Steur; Gunnar Coating apparatus and shroud thereof
US6050499A (en) * 1996-12-03 2000-04-18 Abb K. K. Rotary spray head coater
JP2001314784A (en) * 2000-05-12 2001-11-13 Daihatsu Motor Co Ltd Coating device
JP4428973B2 (en) * 2003-09-10 2010-03-10 トヨタ自動車株式会社 Rotating atomizing coating apparatus and coating method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0780159A1 (en) 1995-12-19 1997-06-25 Toyota Jidosha Kabushiki Kaisha Rotary atomizing electrostatic coating apparatus
US20050040257A1 (en) * 2003-08-19 2005-02-24 Seitz David M. Atomizer with dedicated cleaning fluid system
WO2007000853A1 (en) * 2005-06-27 2007-01-04 Durr Japan K.K. Bell type coating device
EP1849527A2 (en) * 2006-04-28 2007-10-31 Dürr Systems GmbH Atomiser and appropriate operating method
WO2008024804A1 (en) * 2006-08-25 2008-02-28 Illinois Tool Works Inc. Bell cup cleaning system and method
FR2917309A1 (en) * 2007-06-13 2008-12-19 Sames Technologies Soc Par Act ROTATING PROJECTOR OF COATING PRODUCT AND INSTALLATION COMPRISING SUCH A PROJECTOR.

Also Published As

Publication number Publication date
GB2469539B (en) 2011-03-09
GB0916423D0 (en) 2009-10-28
GB2469539A (en) 2010-10-20

Similar Documents

Publication Publication Date Title
JP5571385B2 (en) Operating method for sprayer and corresponding painting equipment
US4601921A (en) Method and apparatus for spraying coating material
US4684064A (en) Centrifugal atomizer
JP5865406B2 (en) Rotating sprayer for spraying coating material and apparatus comprising the sprayer
EP3310490B1 (en) Coating apparatus turbine having internally routed shaping air
CN107234016B (en) Coating nozzle, painting device and the coating process using the coating nozzle and device
US9707578B2 (en) Rotary atomizer nozzle head, and rotary atomizer with such a nozzle head
KR101688936B1 (en) Rotary spray device and method of spraying coating product using such a rotary spray device
JP6022760B2 (en) Nozzle head and rotary spray having the same
EP3938115B1 (en) Rotary bell cup atomizer with auxiliary turbine and vortex shaping air generator
US20090020626A1 (en) Shaping air and bell cup combination
WO2011032906A1 (en) Rotary device and method for transmitting material
US8851399B2 (en) Spraying member, spraying device comprising such a member and spraying installation comprising such a device
JP2007289876A (en) Coating machine
EP1066117B1 (en) A rotary device for transmission of material in particulate form
JPH02152568A (en) Rotary atomization type coating apparatus
JPH09239296A (en) Rotary atomizing type coating apparatus
CN110997155A (en) Atomizer nozzle
JPH1099736A (en) Bell type coating device and coating method using the same
JPH11290727A (en) Method for supplying paint in rotary electrostatic coater

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10751685

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10751685

Country of ref document: EP

Kind code of ref document: A1