Axial thrust equalizer for a liquid pump
First Claim
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1. An axial thrust equalizer for a liquid pump comprisinga dummy piston for securement to a pump rotor shaft;
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1 and the sum of the cross-sectional areas of said ducts is at least three times the cross-sectional area of said gap.
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Abstract
The sleeve of the axial-thrust equalizer is provided with radial bores which deliver working liquid to the annular gap between the sleeve and dummy piston without pre-rotation. The delivered liquid divides within the annular gap so that a sub-flow of liquid is returned to the contiguous pump chamber to prevent pre-rotating liquid from entering directly into the gap from the pump chamber.
37 Citations
18 Claims
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1. An axial thrust equalizer for a liquid pump comprising
a dummy piston for securement to a pump rotor shaft; - and
a stationary sleeve spaced from said dummy piston to define an annular gap of uniform radial width therebetween, said sleeve having a plurality of ducts extending inwardly from an outer periphery to said gap to guide a flow of working liquid from a pump chamber contiguous with said sleeve and said piston into said gap, said ducts communicating with said gap to permit a delivered flow of working liquid to divide into two sub-flows with one sub-flow returning into the pump chamber to prevent rotating liquid in the pump chamber from entering into said gap wherein the ratio of the outer diameter of said sleeve to the inner diameter of said sleeve is at least 1.24;
1 and the sum of the cross-sectional areas of said ducts is at least three times the cross-sectional area of said gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a pump, the combination comprising a housing;
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a shaft rotatably mounted in said housing; at least one rotor mounted on said shaft within said housing and spaced from said housing to define a pump chamber for delivery of a working liquid thereto; a dummy piston on said shaft; and a sleeve mounted in said housing and spaced from said dummy piston to define an annular gap therebetween with said gap communicating at one end with said pump chamber, said sleeve having a plurality of ducts communicating said pump chamber with said gap to guide a flow of the working liquid into said gap, said ducts communicating with said gap to permit a delivered flow of working liquid in said gap to divide into two sub-flows with one sub-flow returning into said pump chamber to prevent pre-rotating liquid in said chamber from entering said gap and the other sub-flow moving towards an opposite end of said gap. - View Dependent Claims (10, 11, 12)
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13. An axial thrust equalizer for a liquid pump comprising
a dummy piston for securement to a pump rotor shaft; -
a stationary sleeve spaced from said dummy piston to define an annular gap therebetween, said sleeve having a plurality of ducts extending inwardly from an outer periphery to said gap to guide a flow of working liquid from a chamber contiguous with said sleeve into said gap, said ducts communicating with said gap to permit a delivered flow of working liquid to divide into two sub-flows with each sub-flow moving towards a respective opposite end of said gap; and wherein the ratio of the outer diameter of said sleeve to the inner diameter of said sleeve is at least 1.25;
1 and the sum of the cross-sectional areas of said ducts is at least three times the cross-sectional area of said gap. - View Dependent Claims (14, 15)
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16. In a pump, the combination comprising
a housing; -
a shaft rotatably mounted in said housing; at least one rotor mounted on said shaft within said housing and spaced from said housing to define a pump chamber for delivery of a working liquid thereto; a dummy piston on said shaft; and a sleeve mounted in said housing and spaced from said dummy piston to define an annular gap therebetween, said sleeve having a plurality of ducts communicating said pump chamber with said gap to guide a flow of the working liquid into said gap, said ducts communicating with said gap to permit a delivered flow of working liquid to divide into two sub-flows with each sub-flow moving towards a respective opposite end of said gap wherein the ratio of the outer diameter of said sleeve to the inner diameter of said sleeve is at least 1.25;
1 and the sum of the cross-sectional areas of said ducts is at least three times the cross-sectional area of said gap. - View Dependent Claims (17)
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18. In a pump, the combination comprising
a housing; -
a shaft rotatably mounted in said housing; at least one rotor mounted on said shaft within said housing and spaced from said housing to define a pump chamber for delivery of a working liquid thereto; a dummy piston on said shaft; and a sleeve mounted in said housing and spaced from said dummy piston to define an annular gap therebetween with said gap opening at one end into said pump chamber, said sleeve having a plurality of ducts communicating said pump chamber with said gap to guide a flow of the working liquid into said gap, said ducts communicating with said gap to permit a delivered flow of working liquid to divide into two sub-flows with one sub-flow returning into said pump chamber to prevent pre-rotating liquid in said chamber from entering said gap and the other sub-flow moving towards an opposite end of said gap, and wherein the ratio of the outer diameter of said sleeve to the inner diameter of said sleeve is at lest 1.25;
1 and the sum of the cross-sectional areas of said ducts is at least three times the cross-sectional area of said gap.
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Specification