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

Claim 0:
1. 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;
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; and
a lower impeller member coupled to an upper impeller member formed by the inlet member, the upper member, and the extension member to form a discharge space from which the fluid is discharged from the impeller;
wherein the lower impeller member and the upper impeller member are located inside an upper pump housing and a lower pump housing, which are coupled to each other;
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 is defined between a first portion of the upper pump housing and a second portion of the lower pump housing,
wherein the discharge space from the impeller and the inlet to the discharge passage are configured to increase pump efficiency by positioning an end of the extension member defining the discharge space to be identical to a position of the first portion of the upper pump housing defining the inlet to the discharge passage, and by positioning 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 defining the inlet to the discharge passage,
wherein the extension member and the lower impeller member forming the discharge space define a length of the extension member that is in a range of 40 to 70% of a height between the extension member and 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 which face each other are parallel to each other to constantly maintain a width of the discharge space.