Electric water pump

Patent metadata

Field	Value
Publication number	US-11353042-B1
Application number	US-202017122207-A
Country	US
Kind code	B1
Filing date	Dec 15, 2020
Priority date	Nov 23, 2020
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

Provided is an electric water pump in which a portion of a fluid discharged from the vicinity of an outer peripheral edge of an impeller flows between the impeller and a lower casing, flows between a rotor and the lower casing, flows between a shaft and the rotor along a channel formed inside the rotor, and then flows to an inlet side of the impeller such that the fluid circulates outside and inside the rotor, and thus, foreign matters contained in the fluid do not accumulate in an accommodation space between the rotor and the lower casing, and thus, efficiency and durability of a motor can be improved.

First claim

What is claimed is:

1. An electric water pump comprising:
a lower casing configured to include a rotor receiver protruding downward and having a rotor accommodating space formed to be recessed from an upper surface to a lower surface;
a shaft configured to be disposed inside the rotor receiver of the lower casing and to have a lower end portion fixed to a bottom of the rotor receiver to extend upward;
an impeller configured to be disposed above the lower casing and to have a hollow penetrating vertically at a center portion thereof;
a rotor configured to be integrally formed with the impeller so as to be fitted onto the shaft and inserted into the rotor accommodation space of the lower casing to be rotatable together with the impeller;
a motor housing configured to be coupled to a lower side of the lower casing; and
a stator configured to be provided inside the motor housing to be fitted into an outer side of the rotor receiver of the lower casing,
wherein the rotor includes a through-hole penetrating both upper and lower surfaces of the rotor, receiving grooves are respectively formed to be recessed on both upper and lower sides of the through-hole, a bushing is inserted into each of the receiving grooves to be fixed thereto, and the bushing is fitted onto the shaft to be rotatably coupled to the shaft, and
the rotor includes a communication channel configured to be connected to the receiving grooves and the through-hole and penetrate both the upper and lower surfaces of the rotor so that an upper end of the communication channel is connected to the hollow of the impeller,
wherein the shaft includes a fixed shaft formed to extend vertically and a fixed plate formed integrally with the fixed shaft to be perpendicular to a lower end of the fixed shaft, and
the fixed plate is fixed to the bottom of the rotor receiver,
wherein the shaft is integrally formed with the rotor receiver by insert injection, and
wherein in the shaft, a lower end portion of the fixed shaft and the fixed plate are embedded in the bottom to be fixed thereto.

2. The electric water pump of claim 1 , wherein the communication channel is formed to be recessed radially outward from the receiving grooves and an inner peripheral surface of the through-hole.

3. The electric water pump of claim 1 , wherein a lower end of the bushing disposed below the rotor is formed to protrude downward than a lower surface of the rotor.

4. The electric water pump of claim 1 , further comprising:
a spacer configured to be disposed between the bushing disposed below the rotor and the bottom of the rotor receiver and to be fitted onto the shaft.

5. The electric water pump of claim 1 , further comprising:
a snap ring configured to be disposed above the bushing disposed above the rotor and to be fitted onto the shaft to be fixed to the shaft.

6. The electric water pump of claim 1 , further comprising:
an upper casing configured to be coupled to an upper side of the lower casing, to be coupled to the lower casing to form an impeller accommodation space for accommodating the impeller inside the upper casing, and to communicate with the impeller accommodation space so as to have an inlet into which a fluid flows and an outlet through which the fluid is discharged.

7. The electric water pump of claim 6 , wherein in the fluid which flows into the inlet when the impeller rotates, a portion of the fluid flows downward between the impeller, the rotor, and the lower casing on a fluid discharge side of the impeller, flows upward along the communication channel formed in the rotor, and then flows to a fluid inlet side of the impeller.

8. An electric water pump comprising:
a lower casing configured to include a rotor receiver protruding downward and having a rotor accommodating space formed to be recessed from an upper surface to a lower surface;
a shaft configured to be disposed inside the rotor receiver of the lower casing and to have a lower end portion fixed to a bottom of the rotor receiver to extend upward;
an impeller configured to be disposed above the lower casing and to have a hollow penetrating vertically at a center portion thereof;
a rotor configured to be integrally formed with the impeller so as to be fitted onto the shaft and inserted into the rotor accommodation space of the lower casing to be rotatable together with the impeller;
a motor housing configured to be coupled to a lower side of the lower casing; and
a stator configured to be provided inside the motor housing to be fitted into an outer side of the rotor receiver of the lower casing,
wherein the rotor includes a through-hole penetrating both upper and lower surfaces of the rotor, receiving grooves are respectively formed to be recessed on both upper and lower sides of the through-hole, a bushing is inserted into each of the receiving grooves to be fixed thereto, and the bushing is fitted onto the shaft to be rotatably coupled to the shaft, and
the rotor includes a communication channel configured to be connected to the receiving grooves and the through-hole and penetrate both the upper and lower surfaces of the rotor so that an upper end of the communication channel is connected to the hollow of the impeller,
wherein the communication channel is formed to be recessed radially outward from the receiving grooves and an inner peripheral surface of the through-hole.

Assignees

• Coavis

Inventors

• Lee Hyun Tae
• Pae Wan Sung
• Lee Woo Keun

Classifications

• F04D29/22

  specially for centrifugal pumps · CPC title

• F04D29/126

  especially adapted for liquid pumps · CPC title

• F04D29/086

  especially adapted for liquid pumps · CPC title

• F04D13/06 Primary

  the pump being electrically driven · CPC title

• F04D29/043

  Shafts · CPC title