Abstract: An electrostatic crop spraying apparatus is arranged so that spray is ejected from the nozzle directly towards the crop, either vertically downwards or at an angle intermediate between the horizontal and the vertical. With respect to the vertical, the spray liquid is fed to the upper surface of a rotatable disc from which it is centrifugally distributed on to the inner surface of a rotatable hollow cone coaxial with the disc. The truncated apex of the cone is uppermost and the liquid is atomized on ejection from the lower circumferential edge of the cone. Charging of the spray is produced at the surface of the disc or of the cone by means of an electrode which maintains an ionized air path to the surface over a distance of a few mm. The current flow for an electrode potential in the range 15 to 30kV is a few .mu.A. A pump may be used to supply liquid to the nozzle in a pulsed flow.

Abstract: A rotary type electrostatic spray painting device is comprised of a housing and a rotary shaft. The housing has an end plate having a circular hole, and the rotary shaft has a front end which passes through the circular hole. The diameter of the front end of the rotary shaft is slightly smaller than that of the circular hole thereby permitting air to pass therebetween. A spray head is fixed onto the tip of the front end of the rotary shaft at a distance from the end plate. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings which are arranged near the rotary shaft at a hollow portion thereof. An electrode, continuously contacts the rear end of the rotary shaft to electrically connect a negative high voltage at the housing of the device to the spray head via the rotary shaft.

Abstract: A rotary type electrostatic spray painting device is provided with a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup-shaped inner wall of the spray head. The rotary shaft is supported in a no-contact state by a single thrust air bearing, a pair of radial air bearings, and a magnetic bearing arranged between the radial air bearings. An electrode for providing continuous electrical contact with the rear end of the rotary shaft, is cooled by being at least partially arranged in a flow path of compressed air. A negative high voltage is applied to the housing of the painting device, which is applied to the spray head via the electrode and the rotary shaft.

Abstract: A rotary type electrostatic spray painting device is provided with a metallic rotary shaft and a spray head fixed onto the front end of the metallic rotary shaft. Paint is fed onto a cup shaped inner wall of the spray head. The metallic rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode continuously contacts the rear end of the metallic rotary shaft. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the metallic rotary shaft. The thrust air bearing comprises an annular plate fixed onto the housing, and a pair of runners fixed onto the metallic rotary shaft and arranged on each side of the annular plate. A plurality of radially extending air passages is formed in the annular plate. A plurality of air outflow bores is formed on the side walls of the annular plate.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup-shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft. The spray head comprises a spray head body and a spray head supporting member. The spray head body has a cylindrical inner circumferential wall which is fitted onto the cylindrical outer circumferential wall of the spray head supporting member. A radially inwardly projecting annular projection is formed on the rear end of the cylindrical inner circumferential wall of the spray head body.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust magnetic bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of tilting pad radial air bearings. The pads of the radial air bearings are electrically connected to the housing of the painting device via leads. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. An annular step portion, radially extending outwardly from the tip edge of the cup shaped inner wall of the spray head, is formed on the tip of the spray head. A thin annular tip wall axially projects from the outer periphery of the annular step portion. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing, a pair of tilting pad radial air bearings, and a single static pressure radial air bearing. The static pressure radial air bearing serves to support the rotary shaft when the rotation of the rotary shaft is stopped. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. A slide plate is fixed onto the rear end of the rotary shaft. An electrode, continuously contacting the slide plate, is arranged in the housing. A negative high voltage is applied to the housing of the painting device. In addition, the negative high voltage is also applied to the spray head via the electrode, the slide plate and the rotary shaft.

Abstract: A rotating speed detecting device of a rotary type electrostatic spray painting device comprising an annular permanent magnet fixed onto the rotary shaft of the spray painting device, and a detecting head mounted on the housing of the spray painting device. The detecting head has an induction coil enclosed by electrically insulating material.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. The spray head comprises a cylindrical inner wall, a plurality of paint outflow bores radially outwardly extending from the cylindrical inner wall, and a cup shaped inner wall radially outwardly extending from the paint outflow bores. Paint is injected onto the cylindrical inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. The thrust air bearing comprises a stationary annular plate and a pair of runners fixed onto the rotary shaft and arranged on each side of the annular plate. Each of the side walls of the annular plate comprises a central wall region facing the corresponding runner, and a peripheral wall region located radially outwardly from the runners. A plurality of air outflow bores is formed on the side walls of the annular plate in the central wall region for feeding air into the clearance between the annular plate and the runners. A plurality of pressure balancing bores are formed in the annular plate and arranged in the peripheral wall region.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft. A cooling air flow passage is formed in the electrode for feeding a cooling air into the contacting face of the electrode and the rear end of the rotary shaft to cool the electrode.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. The electrode is connected to the housing of the device via an electrical wire. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft.

Abstract: Frozen or deep-frozen products transferred by a conveyor system within a furnace are subjected to radiation within the high-frequency or microwave range and to surface cooling which is carried out by electrostatic spraying of the products with cryogenic liquid consisting of liquid nitrogen or Freon R12.

Abstract: A rotary type electrostatic spray painting device comprising a rotary shaft and a spray head fixed onto the front end of the rotary shaft. Paint is fed onto the cup shaped inner wall of the spray head. The rotary shaft is supported by a single thrust air bearing and a pair of radial air bearings. An electrode, continuously contacting the rear end of the rotary shaft, is provided. A negative high voltage is applied to the housing of the paint device. In addition, the negative high voltage is also applied to the spray head via the electrode and the rotary shaft. Each of the radial air bearings comprises a plurality of pads cooperating with the rotary shaft, and a bearing support frame supporting the pads via support pins. The bearing support frame is mounted on the outer wall of the housing via O rings. The bearing support frame and the housing are interconnected to each other by a bolt for preventing relative rotation therebetween.

Abstract: An apparatus for atomizing and dispensing a coating material includes a turbine having a housing and a shaft for rotatably supporting an atomizing device. The shaft includes an outer end extending from the housing for mounting the atomizing device. The shaft outer end includes a tapered portion, and the atomizing device includes a central tapered aperture for receiving the tapered portion of the shaft outer end. The housing is divided into a high-pressure side and a low-pressure side by a nozzle plate which directs the flow of compressed air from the high-pressure side across a driven wheel mounted on the shaft adjacent the nozzle plate. The high-pressure side lies between the atomizing head and the nozzle plate so that compressed air moving through the nozzle plate and the driven wheel to the low-pressure side flows away from the atomizing head.

Abstract: Electrostatic spraying apparatus employs a concealed electrode at a low potential (relative to that used in conventional apparatus) to form an induced charge on a thin layer of liquid. Subsequent mechanical atomization of the charged layer produces a spray of charged droplets. The thin layer is produced by centrifugally spreading an inlet flow and atomization may also be achieved by rotation. An air flow is arranged to sweep the charged droplets out of the field of the electrode and a baffle, in which the electrode is embedded, is formed to control the direction of emergence of the spray from the nozzle.

Abstract: Electrostatic paint spray apparatus having rotary spray head with an air seal. To prevent paint or solvent from entering antifriction bearings, the shaft rotating at high speed is provided with an air seal in an intermediate zone between the bearings and the spray head. Air from a source of compressed air communicating with inlet flows through channel into groove and from there via passageways into the annular air feed chamber. Air leaves the feed chamber between depending lip and shaft, preventing the entry of paint or solvent, and operating even when the apparatus is not spraying. Air is throttled in the other direction through the air flow path to an expansion chamber and then is vented to the atmosphere via vents without contaminating the bearings.

Abstract: Electrostatic spraying apparatus comprises a rotary spraying head and a multiple electrode arrangement which includes two high voltage electrodes one of which has an uninsulated portion, and a grounded electrode. A paint flow space is defined between the uninsulated portion and the grounded electrode as well as the remainder of the one high voltage electrode and the grounded electrode. The second high voltage electrode is spaced outwardly from the grounded electrode and has an insulating layer both on its outer side and on its side facing the grounded electrode.