Transfer of electrostatic charge to a rotary atomizer head through the housing of a rotary atomizing spray device
AssigneeNordson Corporation
InventorsDennis Davis, Harold Beam
Life of this patent
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Abstract
A rotary atomizer having a low capacitance, cup-shaped, atomizing head mounted for rotation about an axis of rotation has a coating material flow surface forming a forward cavity. A rotary drive coupled to the atomizing head rotates the atomizing head about the axis of rotation. High voltage electrostatic energy is conducted through the rotary drive directly into the atomizing head whereby changed coating material flows outwardly across the flow surface. In another embodiment, a semi-conductive ring is mounted on the front end of the atomizer to transfer the high voltage electrostatic energy into the atomizing head and/or to dissipate the electrostatic energy in the rotary drive or in the atomizing head.
Claims23
A rotary atomizer, comprising:
- an atomizer housing having a forward end and a rearward end which define an interior chamber therebetween;
- a semi-conductive ring having a central bore therethrough mounted to said forward end of said atomizer housing;
- a rotary drive extending longitudinally through said interior chamber of said housing and coupled at one end to an atomizing head whereby said atomizing head projects outward from said central bore of said semi-conductive ring and is spaced from said semi-conductive ring to form an air gap therebetween;
- a circuit for transferring a high voltage electrostatic charge through said atomizer housing into said atomizing head;
- and
- said semi-conductive ring being constructed of a semiconductive composite material so that said high voltage electrostatic charge being transferred into said atomizing head is transfered across said air gap between said semi-conductive ring and said atomizing head.
A rotary atomizer, comprising:
- an atomizer housing having a forward end and a rearward end which define an interior chamber therebetween;
- a semi-conductive ring having a central bore therethrough mounted to said forward end of said atomizer housing;
- a rotary drive extending longitudinally through said interior chamber of said atomizer housing and coupled at one end to an atomizing head whereby said atomizing head projects outward from said central bore of said semi-conductive ring and is spaced from said semi-conductive ring to form an air gap therebetween;
- and
- a circuit for transferring a high voltage electrostatic charge through said semi-conductive ring and across said air gap into said atomizing head, said semi-conductive ring being constructed of a semiconductive composite material.
Dependencies are inferred from the claim text.