Air compressor for vehicle

Patent metadata

Field	Value
Publication number	US-2022403854-A1
Application number	US-202017641850-A
Country	US
Kind code	A1
Filing date	Sep 29, 2020
Priority date	Oct 10, 2019
Publication date	Dec 22, 2022
Grant date	—

Abstract

Air compressor for a vehicle having improved internal cooling efficiency by ensuring a circulation flow of compressed air for internal cooling and allowing the compressed air to sufficiently flow. The air compressor comprises: a housing with a compression unit for introducing and compressing air from outside; a motor unit which includes a rotor and a stator, and drives the compression unit to rotate according to the rotation of the rotor; a bearing unit supporting the rotor to be rotatable; a cooling circulation flow path formed inside the housing for moving, in an axial direction, some of the air compressed in the compression unit and circulating the air to the compression unit; and a bypass flow path which receives some of the air passing through the cooling circulation flow path and bypasses a partial region of the bearing unit to join the cooling circulation flow path.

First claim

1 . An air compressor for a vehicle, comprising:
a compression portion disposed on one side of a rotor to generate compressed air by compressing air which flows therein; a bearing portion configured to support the rotor in a front-rear direction; a cooling circulation flow path configured to allow the compressed air discharged from the compression portion to flow in the bearing portion to cool the bearing portion; and a bypass flow path configured to allow the compressed air to bypass at least a part of the bearing portion.

2 . The air compressor of claim 1 , wherein the cooling circulation flow path and the bypass flow path diverge in front of the bearing portion or at a point where the bearing portion is disposed and join behind the bearing portion.

3 . The air compressor of claim 2 , wherein some of the joining compressed air is discharged outward.

4 . The air compressor of claim 2 , wherein at least some of the joining compressed air is supplied to the compression portion through the cooling circulation flow path.

5 . The air compressor of claim 1 , further comprising a housing configured to accommodate the compression portion, the bearing portion, the cooling circulation flow path, and the bypass flow path.

6 . The air compressor of claim 5 , wherein the housing comprises a rear cover disposed behind the rotor.

7 . The air compressor of claim 6 , wherein the rear cover is a plastic material.

8 . The air compressor according to claim 6 , wherein the rear cover comprises at least one discharge hole formed to extend rearward, and
wherein the compressed air is discharged through the discharge hole.

9 . The air compressor of claim 1 , wherein the rotor comprises:
a rotating shaft coupled to the compression portion; a rotor part coupled to an outer circumferential surface of the rotating shaft; and a rotor disk formed on a rear side of the rotor part.

10 . The air compressor of claim 9 , wherein the bearing portion comprises a front air foil bearing and a rear air foil bearing which support a front surface and a rear surface of the rotor disk, respectively.

11 . The air compressor of claim 6 , wherein the cooling circulation flow path comprises:
a cooling flow path disposed outside the rotor to move some of the air compressed by the compression portion from the front to the rear; and a circulation flow path disposed inside the rotor to circulate and supply the air moved from the cooling flow path to the compression portion.

12 . The air compressor of claim 11 , wherein the cooling circulation flow path further comprises a chamber disposed between the cooling flow path and the circulation flow path.

13 . The air compressor of claim 12 , wherein the bypass flow path joins the chamber.

14 . The air compressor of claim 13 , wherein the chamber has a width greater than a width of the cooling flow path or the bypass flow path.

15 . The air compressor of claim 14 , wherein rotating air which rotates in one direction is formed in the chamber while the rotating air rotates in a direction from an outlet of the bypass flow path to an inlet of the circulation flow path.

16 . The air compressor of claim 15 , wherein the compressed air which flows into the chamber from the bypass flow path is transferred to the rear of the chamber due to a flow of the rotating air.

17 . The air compressor of claim 16 , wherein the bypass flow path comes closer to the rotor in a direction toward the chamber.

18 . The air compressor according to claim 17 , wherein the chamber is disposed in the internal of rear cover.

Assignees

• Hanon Systems

Inventors

• Park Gun Woong
• Park Chi Yong
• Lee Jong Sung
• Choi Kyu Sung

Classifications

• F04D17/10

  for compressing or evacuating · CPC title

• F04D29/4206

  especially adapted for elastic fluid pumps · CPC title

• F16C17/04

  for axial load only · CPC title

• F04D29/063

  specially adapted for elastic fluid pumps · CPC title

• F16C37/00

  Cooling of bearings · CPC title