Patent ID: 11865559
Assignee: GRACO MINNESOTA INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 19:
20. A spray tip comprising:
a cylindrical body having a through hole oriented along a fluid flow axis;
a spray outlet piece located in the through hole, the spray outlet piece having an outlet aperture configured to atomize and output a spray fluid, the spray outlet piece including a domed portion and the outlet aperture having a cat-eye shape and extending into the domed portion;
an upstream chamber piece located in the through hole, the upstream chamber piece comprising:
an internal aperture wall comprising an upstream surface and a downstream surface; and
an aperture through the wall, the aperture comprising:
an inlet orifice opening flush with the upstream surface and having a first diameter;
an outlet orifice opening located at the downstream surface and having a second diameter different from the first diameter;
an annular inner surface that is linearly sloped along its entire length between the inlet orifice opening and the outlet orifice opening of the aperture wall;
an annular inlet corner defining the inlet orifice opening, the annular inlet corner defined as a smaller of two angles taken between the upstream surface of the aperture wall and the annular inner surface of the aperture; and
an annular outlet corner defining the outlet orifice opening, the annular outlet corner defined as a smaller of two angles taken between the downstream surface of the aperture wall and the annular inner surface;
wherein one of the annular inlet corner or the annular outlet corner is less than 90 degrees, and wherein the other of the annular inlet corner or the annular outlet corner is greater than 90 degrees; and

a turbulation chamber defined by the spray outlet piece and the upstream chamber piece, the turbulation chamber comprising:
an expansion section serially fluidly connected with and downstream of the outlet orifice opening of the aperture; and
a reduction section downstream of the expansion section and upstream of the outlet aperture of the spray outlet piece;
wherein the expansion section has a length disposed along the flow axis;
wherein the expansion section is frustoconical along the length and expands in a downstream direction; and
wherein the reduction section is frustoconical and narrows in the downstream direction;

wherein the outlet aperture is disposed downstream of the turbulation chamber and is configured to receive a flow of fluid from the turbulation chamber.