Patent ID: 8974206
Filing Date: 2015-03-10
Classification: F01C,F04C

Abstract:
1. A metering pump with a special-shaped cavity comprising a housing ( 1 ) with a special-shaped surface inner cavity, an inlet ( 2 ) and an outlet ( 3 ), an upper cover plate ( 12 ) and a lower cover plate ( 22 ), wherein the upper cover plate ( 12 ) and the lower cover plate ( 22 ) are mounted on the two end surfaces of the housing ( 1 ), the housing ( 1 ), the upper cover plate ( 12 ) and the lower cover plate ( 22 ) constitute a sealed cavity, a rotor is mounted in the sealed cavity, and the metering pump with the special-shaped cavity is characterized in that a first combined sliding plate ( 6 ) and a second combined sliding plate ( 7 ) are arranged on the rotor, and two ends of each of the first combined sliding plate ( 6 ) and the second combined sliding plate ( 7 ) are kept in joint with the special-shaped surface inner cavity respectively; the special-shaped surface inner cavity of the housing ( 1 ) is formed by sequentially linking a one-quarter circular arc surface AB, a one-quarter oval arc surface BC, the one-quarter circular arc surface CD, a turning transition surface DE and a position-limiting curved surface EA, and the one-quarter circular arc surface AB, the one-quarter oval arc surface BC and the one-quarter circular arc surface CD have a common axis O; a radius R of the one-quarter circular arc surface AB is equivalent to a major semi-axis α of the one-quarter oval arc surface BC, and a radius r of the one-quarter circular arc surface CD is equivalent to a minor semi-axis b of the one-quarter oval arc surface BC; the end point B of a major axis of the one-quarter oval arc surface BC is tangent to the one-quarter circular arc surface AB at the end point B for forming a smooth transition; the end point C of a minor axis of the one-quarter oval arc surface BC is tangent to the one-quarter circular arc surface CD at the end point C for forming the smooth transition; the position-limiting curved surface EA is tangent to the one-quarter circular arc surface AB at the end point A for forming the smooth transition; the turning transition surface DE is intersected with the one-quarter circular arc surface CD at the end point D and intersected with the position-limiting curved surface EA at the end point E for forming a step transition from the one-quarter circular arc surface CD to the position-limiting curved surface EA; and a distance from the common axis O is gradually increased during the transition from the E point to the A point in the position-limiting curved surface EA.