Micro hydraulic suspension mechanical pump and assembling method thereof

A micro hydraulic suspension mechanical pump, comprising:

• a volute, a sealing gasket, an upper end cap, a waterproof cover, a positioning sheet, a hollow cup motor, an impeller, a rotor sleeve, a shaft cover, and a motor bottom cap, wherein
• the volute is provided with a water inlet channel and a water outlet channel, an inner space of the volute serves as a pump chamber, and the water inlet channel and the water outlet channel are respectively communicated with the pump chamber;
• a lower end of the waterproof cover is closed, and an upper end is open and is provided with a flange;
• the hollow cup motor comprises a motor casing, an iron core, a coil, and a magnet rotor;
• the iron core is installed on a side wall of the motor casing, an inner wall of the iron core is sheathed with the coil, and an inner hole of the coil is covered with the waterproof cover to prevent liquid from flowing into the coil;
• the waterproof cover is in a separated state from the motor casing, and a lower part of the flange of the waterproof cover has a positioning boss to implement radial limitation in cooperation with a recess at a corresponding position of the hollow cup motor, the recess is located on the motor casing;
• the positioning sheet is installed between the recess and the positioning boss, and axial positioning of the waterproof cover is implemented through adjusting a number and/or a thickness of the positioning sheet;
• the volute and the motor casing are fixedly connected, the sealing gasket is disposed between an upper end surface of the waterproof cover and the volute, and the waterproof cover is also used to carry the upper end cap;
• the upper end cap is provided with a circumferential water inlet communicated with the pump chamber to allow water to flow into the waterproof cover, the rotor sleeve is sleeved onto an outer side of the magnet rotor, and the shaft cover is fixedly sleeved onto an inner hole wall surface of the magnet rotor;
• the magnet rotor is located in the waterproof cover, a rotating shaft of the impeller passes through a middle water outlet of the upper end cap to be cooperatively connected to an inner side wall of the shaft cover, and a vane of the impeller is located in the pump chamber, there is a first gap between an inner side wall of the shaft cover and an outer side surface of the rotating shaft of the impeller as a first water flow channel, the first gap extends over a part of a radial portion of the rotating shaft, the first water flow channel is communicated with the pump chamber, there is a second gap between an outer side wall of the rotor sleeve and an inner side wall of the waterproof cover as a second water flow channel, and the second water flow channel is communicated with the circumferential water inlet.