ELECTRIC PUMP

• US 20190316594A1
• Filed: 04/11/2019
• Published: 10/17/2019
• Est. Priority Date: 04/13/2018
• Status: Abandoned Application

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Inventors: HATTORI, Shuji, YOSHIDA, Taichi, IMAI, Yuya, SUZUKI, Shinjiro
• Application Number:
  US16/381,500
• Publication Number:
  US 20190316594A1
• Time in Patent Office: Days
• CPC Class Codes: F04D 1/00 Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps adapted for pumping specific fluids F04D7/00; priming or boosting F04D9/00
• CPC Class Codes: F04D 13/06 the pump being electrically driven
• CPC Class Codes: F04D 13/0606 Canned motor pumps
• CPC Class Codes: F04D 13/0633 Details of the bearings
• CPC Class Codes: F04D 29/043 Shafts
• CPC Class Codes: F04D 29/20 Mounting rotors on shafts
• CPC Class Codes: F04D 29/4293 Details of fluid inlet or outlet
• CPC Class Codes: F05B 2240/60 Shafts
• CPC Class Codes: F05D 2260/30 Retaining components in desired mutual position

Abstract

An electric pump includes a shaft, a rotor provided outward in a radial direction of the shaft, and to be rotated to the shaft, an impeller fixed to the rotor, and a cylindrical cap attached to a tip end portion of the shaft. A pump housing includes a suction port provided in an extending direction of the shaft, and a discharge port provided at one side of the impeller and in a direction crossing an extending direction of the shaft. The shaft includes an exposed portion at a tip end side further than a portion to which the cap is attached in the tip end portion. The cap is held by the shaft, prevents the rotor from moving toward a tip end side of the shaft, and includes, on an outer peripheral portion, a first taper portion being decreased in diameter toward the tip end side of the shaft.

Claims

1. An electric pump, comprising:

a motor housing, and a pump housing adjacent to the motor housing;

a shaft including a base end portion fixed to the motor housing;

a rotor housed in the motor housing, provided outward in a radial direction of the shaft, and to be rotated with respect to the shaft; and

an impeller housed in the pump housing and fixed to the rotor at a side of a tip end portion of the shat, and a cylindrical cap attached to the tip end portion of the shaft, wherein

the pump housing includes a suction port provided in an extending direction of the shaft, and a discharge port provided at one side of the impeller and in a direction crossing an extending direction of the shaft,

the shaft includes an exposed portion at a tip end side further than a portion to which the cap is attached in the tip end portion, and

the cap is held by the shaft, is configured to prevent the rotor from moving toward a tip end side of the shaft, and includes, on an outer peripheral portion, a first taper portion being decreased in diameter toward a tip end side of the shaft.

2. The electric pump according to claim 1, wherein the exposed portion of the shaft includes a second taper portion being decreased in diameter toward a tip end of the shaft.

3. The electric pump according to claim 2, wherein

the impeller includes a third taper portion being decreased in diameter toward a tip end side of the shaft at a portion adjacent to the cap on an outer peripheral side of the shaft.

4. The electric pump according to claim 3, wherein

the first taper portion of the cap, the second taper portion of the shaft, and the third taper portion of the impeller are formed in such a way that all inclinations relative to a virtual plane perpendicular to an extending direction of the shaft are same.

5. The electric pump according to claim 3, wherein

the first taper portion of the cap, the second taper portion of the shaft, and the third taper portion of the impeller are formed in such a way that inclinations relative to a virtual plane perpendicular to an extending direction of the shaft become gentler toward the impeller from a tip end of the tip end portion of the shaft.

6. The electric pump according to claim 1, wherein the tip end portion of the shaft is attached with a retaining ring which prevents a fall of the cap.

7. The electric pump according to claim 4, wherein the tip end portion of the shaft is attached with a retaining ring which prevents a fall of the cap.

8. The electric pump according to claim 5, wherein the tip end portion of the shaft is attached with a retaining ring which prevents a fall of the cap.

9. The electric pump according to claim 1, wherein a male screw is provided to an outer peripheral portion of the tip end portion of the shaft, a female screw portion is provided to an inner peripheral portion of the cap, and the cap is screwed to the tip end portion of the shaft.

10. The electric pump according to claim 4, wherein a male screw is provided to an outer peripheral portion of the tip end portion of the shaft, a female screw portion is provided to an inner peripheral portion of the cap, and the cap is screwed to the tip end portion of the shaft.

11. The electric pump according to claim 5, wherein a male screw is provided to an outer peripheral portion of the tip end portion of the shaft, a female screw portion is provided to an inner peripheral portion of the cap, and the cap is screwed to the tip end portion of the shaft.

12. The electric pump according to claim 1, wherein the cap is attached to the shaft by press- fitting.

13. The electric pump according to claim 4, wherein the cap is attached to the shaft by press- fitting.

14. The electric pump according to claim 5, wherein the cap is attached to the shaft by press- fitting.