Liquid and air mixing gear pump

Claim 2

A mixing pump having an output which is an admixture of an incompressible and a compressible fluid successively supplied in a closely controlled proportion comprising a casing having separate inlets for said fluids and at an outlet for said admixture, intermeshing rotor means in said casing having at least one recess of predetermined volumetric capacity to receive said fluids, said inlets and outlet being connected to said rotors, said incompressible fluid being received in said recess at a point where said rotors move out of mesh said compressible fluid being received in said recess at a point between said inlet and said outlet and being mixed with said incompressible fluid during passage to said outlet, and means for controlling the volume of flow of said incompressible fluid to said rotors whereby the proportion of the admixture components is closely controlled, said means comprising a chamber connecting said incompressible fluid inlet with said rotors, and valve means for said chamber for controlling the flow of said fluid to said rotors, said chamber having a port leading to said outlet and said valve means comprising a double-acting valve controlling the flow to said rotors and back flow from said outlet.

Claim 3

A mixing pump having an output which is an admixture of an incompressible and a compressible fluid successively supplied in a closely controlled proportion comprising a casing having separate inlets for said fluids and an outlet for said admixture, intermeshing rotor means in said casing have at least one recess of predetermined volumetric capacity to receive said fluids, said inlets and outlet being connected to said rotors, said incompressible fluid being received in said recess at a point where said rotors move out of mesh said compressible fluid being received in said recess at a point between said inlet and said outlet and being mixed with said incompressible fluid during passage to said outlet, and means for controlling the volume of flow of said incompressible fluid to said rotors whereby the proportion of the admixture components is closely controlled, said means comprising a chamber connecting said incompressible fluid inlet with said rotors, and valve means for said chamber for controlling the flow of said fluid to said rotors, said chamber having a port connected with said outlet, a sleeve within said chamber, a second valve member normally closing said last named port, and resilient means seated on said sleeve and urging said second valve member towards the closed position.

Claim 4

A mixing pump having an output which is an admixture of an incompressible and a compressible fluid successively supplied in a closely controlled proportion comprising a casing having separate inlets for said fluids and an outlet for said admixture, intermeshing rotor means in said casing have at least one recess of predetermined volumetric capacity to receive said fluids, said inlets and outlet being connected to said rotors, said incompressible fluid being received in said recess at a point where said rotors move out of mesh said compressible fluid being received in said recess at a point between said inlet and said outlet and being mixed with said incompressible fluid during passage to said outlet, and means for controlling the volume of flow of said incompressible fluid to said rotors whereby the proportion of the admixture components is closely controlled, said means comprising a chamber connecting said incompressible fluid inlet with said rotors, and valve means for said chamber for controlling the flow of said fluid to said rotors, said chamber having a port connected with said outlet, a sleeve within said chamber, a second valve member normally closing said last named port, and resilient means seated on said sleeve and urging said second valve member towards the closed position.

Claim 5

A liquid and air mixing gear pump comprising a pump casing, a pair of intermeshing gears rotatably mounted inside said casing, a liquid intake duct ending with a port at a point in which said gears begin to come out of mesh; means comprising an adjustable shutter for varying the free flow passage area of said liquid intake port, a liquid and air mixture delivery port at the point in which said gears come into mesh, and an air intake port opening in the path of the crown of the teeth of each gear between said liquid intake and said liquid and air mixture delivery port.

Claim 6

A liquid and air mixing gear pump comprising a pump casing, a pair of intermeshing gears rotatably mounted inside said casing, a liquid intake duct ending with a port at a point in which said gears begin to come out of mesh; means comprising an adjustable shutter for varying the free flow passage area of said liquid intake port, a liquid and air mixture delivery port at the point in which said gears come into mesh, and an air intake port opening in the path of the crown of the teeth of each gear between said liquid intake and said liquid and air mixture delivery port.

Claim 7

A pump according to claim 3 in which said shutter is provided with a number of calibrated ports individually mOvable into the area of said liquid intake port.

Claim 8

A pump according to claim 3 further comprising a bypass valve connecting the said delivery port with said liquid intake port.

Claim 9

A mixing gear pump having an output which is an admixture of a liquid and air successively supplied in a closely controlled proportion, comprising a pump casing, a pair of intermeshing gears rotatably mounted in said casing, a liquid intake duct ending with a port at a point in which said gears begin to move out of mesh, means for varying the free flow passage area of said liquid intake duct, a liquid and air mixture delivery port at the position where the said gears move into mesh, and for each gear an air intake port disposed to supply air to the teeth of the gear at a position between said liquid intake and said liquid and air mixture delivery port.

Claim 10

A mixing gear pump having an output which is an admixture of a liquid and air successively supplied in a closely controlled proportion, comprising a pump casing, a pair of intermeshing gears rotatably mounted in said casing, a liquid intake duct ending with a port at a point in which said gears begin to move out of mesh, means for varying the free flow passage area of said liquid intake duct, a liquid and air mixture delivery port at the position where the said gears move into mesh, and for each gear an air intake port disposed to supply air to the teeth of the gear at a position between said liquid intake and said liquid and air mixture delivery port.