Radial pump with hydrostatic load balance

Claim 2

A radial pump comprising a housing, a radial plunger reciprocable in said housing, a drive shaft for said pump, an eccentric on said drive shaft for moving said plunger radially outwardly during a portion of each revolution of said drive shaft, means for moving said plunger radially inwardly during another portion of each such revolution of said drive shaft, a pumping chamber associated with said plunger having an inlet port through which fluid is drawn during radial movement of said plunger away from said pumping chamber and a delivery port through which such fluid is pumped from said pumping chamber during radial movement of said plunger toward said pumping chamber, and means providing a confined recess adjacent the outer face of said eccentric in radial alignment with said plunger, said recess having fluid communication with said pumping chamber for providing a load on said plunger in opposition to the load imposed on said plunger by the fluid pressure in said pumping chamber, said means providing a confined recess adjacent the outer face of said eccentric comprising a slipper bearing pivotally connected to said plunger, said slipper bearing having said recess in the undersurface thereof with the rim of said recess closely adjacent the outer face of said eccentric, said means for moving said plunger radially inwardly comprising slipper retention plates secured to opposite sides of said eccentric, said slipper retention plates having rim portions overlying shoulder portions on said slipper bearing for retaining said slipper bearing in close relation to said eccentric, said retention plates being enlarged radially opposite the outermost portion of said eccentric to provide a counterbalance for said eccentric.

Claim 3

A radial pump comprising a housing, a radial plunger reciprocable in said housing, a drive shaft extending into said housing, an eccentric on said drive shaft within said housing, a pumping chamber associated with said plunger, a slipper bearing pivotally connected to said plunger, and slipper retention plates secured to opposite ides of said eccentric, said slipper retention plates having rim portions overlying shoulder portions on said slipper bearing for retaining said slipper bearing in close relation to said eccentric, whereby rotation of said eccentric causes reciprocation of said plunger, said retention plates being enlarged radially opposite the outermost portion of said eccentric to provide a counterbalance for said eccentric.

Claim 4

A radial pump comprising a housing, a radial plunger reciprocable in said housing, a drive shaft extending into said housing, an eccentric on said drive shaft within said housing, a pumping chamber associated with said plunger, a slipper bearing pivotally connected to said plunger, and slipper retention plates secured to opposite ides of said eccentric, said slipper retention plates having rim portions overlying shoulder portions on said slipper bearing for retaining said slipper bearing in close relation to said eccentric, whereby rotation of said eccentric causes reciprocation of said plunger, said retention plates being enlarged radially opposite the outermost portion of said eccentric to provide a counterbalance for said eccentric.

Claim 5

A radial pump comprising a housing, a radial plunger reciprocable in said housing, a drive shaft for said pump, means for reciprocating said plunger during rotation of said drive shaft, a pumping chamber associated with said plunger having an inlet port through which fluid is drawn during radial movement of said plunger away from said pumping chamber and a delivery port through which such fluid is pumped from said pumping chamber during radial movement of said plunger toward said pumping chamber, the fluid pressure in said pumping chamber applying a load to said shaft through said plunger, said housing having an axial bore for said shaft, and a pair of recesses in the wall of said bore on opposite sides of the plunger center line radially opposite said plunger, said recesses having fluid cOmmunication with said pumping chamber, the area of said recesses being substantially equal to one-half the area of said plunger to provide a hydrostatic load on said shaft balancing the load applied to said shaft by said plunger despite variations in the pressure in said pumping chamber.

Claim 6

A radial pump comprising a housing, a radial plunger reciprocable in said housing, a drive shaft for said pump, means for reciprocating said plunger during rotation of said drive shaft, a pumping chamber associated with said plunger having an inlet port through which fluid is drawn during radial movement of said plunger away from said pumping chamber and a delivery port through which such fluid is pumped from said pumping chamber during radial movement of said plunger toward said pumping chamber, the fluid pressure in said pumping chamber applying a load to said shaft through said plunger, said housing having an axial bore for said shaft, and a pair of recesses in the wall of said bore on opposite sides of the plunger center line radially opposite said plunger, said recesses having fluid cOmmunication with said pumping chamber, the area of said recesses being substantially equal to one-half the area of said plunger to provide a hydrostatic load on said shaft balancing the load applied to said shaft by said plunger despite variations in the pressure in said pumping chamber.

Claim 7

The pump of claim 14 wherein said means for reciprocating said plunger during rotation of said drive shaft comprises an eccentric on said drive shaft for moving said plunger radially outwardly during a portion of each revolution of said drive shaft, and means for moving said plunger radially inwardly during another portion of each such revolution of said drive shaft, and there are means providing a confined recess adjacent the outer face of said eccentric in radial alignment with said plunger, said recess having fluid communication with said pumping chamber for providing a load on said plunger in opposition to the load imposed on said plunger by the fluid pressure in said pumping chamber, said means providing a confined recess adjacent the outer face of said eccentric comprising a slipper bearing pivotally connected to said plunger, said slipper bearing having said recess in the undersurface thereof with the rim of said recess closely adjacent the outer face of said eccentric, and fluid passage means in said pump communicating said pumping chamber with said recess, the area of said recess in said slipper bearing being slightly less than the area of said plunger to provide a slight overload acting on said plunger urging said slipper bearing into close sliding engagement with said eccentric to reduce fluid leakage between the rim of said recess and said eccentric.

Claim 8

The pump of claim 4 wherein said means for moving said plunger radially inwardly comprises slipper retention plates secured to opposite sides of said eccentric, said slipper retention plates having rim portions overlying shoulder portions on said slipper bearing for retaining said slipper bearing in close relation to said eccentric.

Claim 9

The pump of claim 5 further comprising a link pin interconnecting said plunger and slipper bearing, said rim portions of said slipper retention plates extending radially beyond the ends of said link pin to retain said link pin in place.

Claim 10

The pump of claim 3 wherein there are a plurality of said circumferentially spaced radial plungers reciprocable in said housing during rotation of said shaft, plural pumping chambers for said plungers, and additional recesses in the wall of said bore radially opposite each of said plungers, said additional recesses having direct fluid communication with the radially opposite pumping chambers substantially to provide a hydrostatic load balance on said shaft.

Claim 11

The pump of claim 7 wherein there are two of said recesses for each of said plungers located on opposite sides of the plunger center lines radially opposite said plungers, the area of each of said recesses being substantially equal to one-half the area of said plungers to provide a hydrostatic load balance on said shaft.

Claim 12

A radial pump comprising a housing, a radial plunger reciprocable in said housing, a drive shaft for said pump, an eccentric on said drive shaft for moving said plunger radially outwardly during a portion of each revolution of said drive shaft, means for moving said plunger radially inwardly during another portion of each such revolution of said drive shaft, a pumping chamber associated with said plunger having an inlet port through which fluid is drawn during radial movement of said plunger away from said pumping chamber and a delivery port through which such fluid is pumped from said pumping chamber during radial movement of said plunger toward said pumping chamber, and means providing a confined recess adjacent the outer face of said eccentric in radial alignment with said plunger, said recess having fluid communication with said pumping chamber for providing a load on said plunger in opposition to the load imposed on said plunger by the fluid pressure in said pumPing chamber, said means providing a confined recess adjacent the outer face of said eccentric comprising a slipper bearing pivotally connected to said plunger, said slipper bearing having said recess in the undersurface thereof with the rim of said recess closely adjacent the outer face of said eccentric, a link pin interconnecting said plunger and slipper bearing, a central longitudinal passage in said pin, aligned radial passages in said plunger and link pin communicating said pumping chamber with said central longitudinal passage in said link pin, and additional aligned radial passages in opposite ends of said link pin and slipper bearing communicating said central longitudinal passage in said link pin with said recess in said slipper bearing, said means for moving said plunger radially inwardly comprising slipper retention plates secured to opposite sides of said eccentric, said slipper retention plates having rim portions overlying shoulder portions on said slipper bearing for retaining said slipper bearing in close relation to said eccentric, said rim portions also overlying the ends of said link pin to retain said link pin in place.

Claim 13

A radial pump comprising a housing, a radial plunger reciprocable in said housing, a drive shaft for said pump, an eccentric on said drive shaft for moving said plunger radially outwardly during a portion of each revolution of said drive shaft, means for moving said plunger radially inwardly during another portion of each such revolution of said drive shaft, a pumping chamber associated with said plunger having an inlet port through which fluid is drawn during radial movement of said plunger away from said pumping chamber and a delivery port through which such fluid is pumped from said pumping chamber during radial movement of said plunger toward said pumping chamber, and means providing a confined recess adjacent the outer face of said eccentric in radial alignment with said plunger, said recess having fluid communication with said pumping chamber for providing a load on said plunger in opposition to the load imposed on said plunger by the fluid pressure in said pumPing chamber, said means providing a confined recess adjacent the outer face of said eccentric comprising a slipper bearing pivotally connected to said plunger, said slipper bearing having said recess in the undersurface thereof with the rim of said recess closely adjacent the outer face of said eccentric, a link pin interconnecting said plunger and slipper bearing, a central longitudinal passage in said pin, aligned radial passages in said plunger and link pin communicating said pumping chamber with said central longitudinal passage in said link pin, and additional aligned radial passages in opposite ends of said link pin and slipper bearing communicating said central longitudinal passage in said link pin with said recess in said slipper bearing, said means for moving said plunger radially inwardly comprising slipper retention plates secured to opposite sides of said eccentric, said slipper retention plates having rim portions overlying shoulder portions on said slipper bearing for retaining said slipper bearing in close relation to said eccentric, said rim portions also overlying the ends of said link pin to retain said link pin in place.