Cruciform pump

A cruciform pump comprises a casing, a positioning round disk, a driven rotary disk, and two sliding blocks;

• wherein the casing is formed by a seat and a top cover;
• the seat is a round disk and an inner edge thereof has a receiving space;
• a bearing is engaged at a center of the receiving space for installing a positioning round disk;
• a periphery of the casing has an inlet and an outlet;
• a top cover is installed above the seat and has a penetrated eccentric hole;
• the positioning round disk is placed in the receiving space;
• one surface thereof is protruded with a positioning post, and another surface is installed with a cruciform sliding groove, the positioning post is exactly inserted into the bearing;
• two sliding blocks are installed in the sliding groove;
• the driven rotary disk is a round disk;
• one surface thereof has a rotary shaft and another surface has two positioning rods, a half a distance between centers of the two positioning rods is equal to a distance between an axial centers of the rotary shaft and the positioning round disk;
• the rotary shaft is eccentric and parallel to the axial centers of the casing and the positioning round disk;
• thereby the rotary shaft exactly passes through the eccentric hole of the top cover and thus is protruded out and the two positioning rods are used for connecting the two sliding blocks;
• the two sliding blocks are positioned in the sliding groove;
• each sliding block has a positioning hole thereon for being inserted by the positioning rod of the rotary disk;
• thereby, the two sliding blocks are driving by the driven rotary disk;
• wherein when the driven rotary disk completes two circular rotations, the positioning round disk completes only one circular rotation, and when the rotary disk and round disk rotate, the movement of the sliding blocks causes fluid to be sucked from the inlet into the sliding groove and then discharged from the sliding groove through the outlet.