US 5,702,209 A · Powder feed device, especially for powder coating material

Abstract

A powder feed device, especially for powder coating material, with an injector (2), in which a partial vacuum is created by a feed air stream according to the principle of a Venturi pipe and powder is drawn out of a powder container (10) and transported. An additional air stream can also be added to the feed air stream. In a computer (24), a plurality of predetermined powder feed rates (m) is stored in memory, on a calibration diagram (50), along a first diagram axis, and a plurality of feed air rates (FV) is stored in memory along a second diagram axis, for predetermined total air rates (GV) (feed air and added additional air, if needed). The computer (24) contains a powder rate reference value input (52) to input a selected powder rate reference (m-ref) and calculates the necessary feed air rate (FV) and the necessary additional air rate for this value as a function of the predetermined total air rate (GV), and generates a feed air rate reference value (FV-ref) and an additional air rate reference value (ZV-ref) as a function of the calculation result.

Claims20

Dependent claims

A powder feed system for powder coating material, comprising:

a feed air line for conducting a feed air stream;
a container for containing powder coating material;
an injector operatively connected to said container and said feed air line such that as said feed air stream is conducted through said injector, said powder coating material disposed within said container is withdrawn from said container and entrained within said feed air stream;
an additional air line for conducting an additional air stream into said feed air stream;
a feed air regulator for regulating said feed air stream;
an additional air regulator for regulating said additional air stream;
a computer having a memory;
and
calibration diagram means stored within said computer memory for correlating a plurality of feed air rates, a plurality of powder feed rates, and a plurality of total air rates comprising feed air rates and additional air rates, wherein a feed air rate, required in connection with a predetermined total air rate, can be derived from said calibration diagram means as a function of a predetermined powder feed rate.

6 more elements

A powder feed system for powder coating material, comprising:

a feed air line for conducting a feed air stream;
a container for containing powder coating material;
an injector operatively connected to said container and to said feed air line such that as said feed air stream is conducted through said injector, said powder coating material disposed within said container is withdrawn from said container and entrained within said feed air stream;
an additional air line for conducting an additional air stream into said feed air stream;
a feed air regulator for regulating said feed air stream;
an additional air regulator for regulating said additional air stream;
calibration diagram means for correlating a plurality of feed air rates, a plurality of powder feed rates, and a plurality of total air rates comprising feed air rates and additional air rates;
and
computer means, having a memory within which said calibration diagram means is stored, for generating a feed air rate signal to said feed air regulator, derived from said calibration diagram means as a function of a predetermined total air rate and a predetermined powder feed rate, and for generating an additional air rate signal to said additional air regulator, as a function of said predetermined total air rate and said derived feed air rate.

6 more elements

Dependencies are inferred from the claim text.

Powder feed device, especially for powder coating material

Life of this patent

Powder feed device, especially for powder coating material

Life of this patent

Abstract

Claims20