Vortex pump and fuel vapor treatment device comprising the vortex pump

Patent metadata

Field	Value
Publication number	US-10041501-B2
Application number	US-201715481719-A
Country	US
Kind code	B2
Filing date	Apr 7, 2017
Priority date	Apr 13, 2016
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A vortex pump may include a motor portion and a pump portion. The pump portion includes an impeller that rotates integrally with an output shaft of a motor. The motor portion and the pump portion are separated by a separation wall. A vane-groove region including vane grooves is provided on a surface of the impeller facing the separation wall. The separation wall includes a facing groove facing the vane-groove region and extending along a rotation direction of the impeller. A communication hole that communicates the motor portion and the pump portion is provided on the facing groove. The communication hole extends in a direction along swirling flow formed by the vane grooves and the facing groove when the vortex pump is operating.

First claim

What is claimed is:

1. A vortex pump comprising a housing, wherein
the housing comprises:
a motor portion comprising a motor;
a pump portion comprising a fluid suction port, a fluid discharge port, and an impeller configured to rotate together with an output shaft of the motor; and
a separation wall comprising a bearing fixed to the separation wall and separating the motor portion and the pump portion, the bearing supporting the output shaft;
wherein the impeller comprises a vane-groove region at an outer periphery of a surface of the impeller facing the separation wall along a rotation direction in which the impeller rotates, the vane-groove region including a plurality of vanes and a plurality of vane grooves, each of which is disposed between the adjacent vanes, and
the separation wall comprises a facing groove facing the vane-groove region, extending in the rotation direction of the impeller, and having a bottom provided with a communication hole for communicating the motor portion and the pump portion, and
wherein the communication hole extends from a bottom of the facing groove toward the motor portion, the communication hole inclined to approach the output shaft of the motor.

2. The vortex pump according to claim 1 , further comprising another communication hole for communicating the motor portion and the pump portion,
wherein the communication hole is provided on a fluid suction port side and the other communication hole is provided on a fluid discharge port side.

3. The vortex pump according to claim 2 , further comprising a filter provided on the other communication hole on the fluid discharge port side.

4. The vortex pump according to claim 1 , wherein
the communication hole is provided at a position where a pressure equivalent to a pressure applied to the bearing is applied when the vortex pump is operating.

5. A fuel vapor treatment device comprising:
a canister that absorbs fuel vapor generated in a fuel tank;
a purge passage connected between an intake passage of an internal combustion engine and the canister, and through which purge gas fed from the canister to the internal combustion engine passes; and
a vortex pump according to claim 1 and provided on the purge passage between the canister and the intake passage,
wherein a size of the communication hole provided in the vortex pump is larger than a size of apertures of a filter provided on the canister.

6. A vortex pump comprising a housing, wherein
the housing comprises:
a motor portion comprising a motor;
a pump portion comprising a fluid suction port, a fluid discharge port, and an impeller configured to rotate together with an output shaft of the motor; and
a separation wall comprising a bearing fixed to the separation wall and separating the motor portion and the pump portion, the bearing supporting the output shaft;
wherein the impeller faces the separation wall, and
the separation wall comprises a communication hole for communicating the motor portion and the pump portion, the communication hole inclined to the output shaft of the motor.

Assignees

• Aisan Ind

Inventors

• Torii Hidemasa
• Sugimoto Atsushi
• Suzuki Shinya

Classifications

• F04D5/002 Primary

  Regenerative pumps (for elastic fluids F04D23/008) · CPC title

• F02M25/08

  adding fuel vapours drawn from engine fuel reservoir {(electrical control of purge system F02D41/003)} · CPC title

• F04D23/008 Primary

  Regenerative pumps (for liquids or for liquids and elastic fluids F04D5/002) · CPC title

• F04D29/2244

  Free vortex · CPC title

• F04D5/00

  Pumps with circumferential or transverse flow {(control thereof F04D15/005)} · CPC title