Patent ID: 11873819
Assignee: COAVIS
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 3:
4. An impeller for an electric water pump, comprising:
an inlet member formed in a pipe shape extending from an upper member to allow a fluid to be introduced through the inlet member and flow through the upper member in a first direction;
the upper member having an inner diameter increasing in size along the first direction;
a lower impeller member coupled to an upper impeller member formed by the inlet member and the upper member to form a discharge space from which the fluid is discharged, wherein the lower impeller having a support shaft inserted into a central portion thereof, and having a protruding portion that is partially surrounding the support shaft, and
an extension member outwardly extending from one end of the upper member and at an angle different from that of an inclined angle of the upper member;
wherein an outer surface of the protruding portion includes a curved surface; and
wherein the lower impeller member and the upper impeller member are located inside an upper pump housing and a lower pump housing coupled to each other, and wherein the upper and lower pump housings form a discharge passage to receive and convey the fluid to be discharged from the impeller;
wherein an inlet to the discharge passage being formed between a first portion in the upper pump housing and a second portion in the lower pump housing, and
wherein a position of an end of the extension member defining the discharge space is positioned identical to a position of the first portion of the upper pump housing and a position of an end of the lower impeller member defining the discharge space to be identical to a position of the second portion of the lower pump housing,
wherein a length of the extension member is in a range of 40 to 70% of a height between the extension member and the lower impeller member,
wherein an edge portion of the lower impeller member and the extension member are parallel to each other, and
wherein inner surfaces of the upper impeller member and the lower impeller member that face each other are parallel to each other to constantly maintain a width of the discharge space.