Impeller and cleaner employing the same

Patent metadata

Field	Value
Publication number	US-2024392799-A1
Application number	US-202418766852-A
Country	US
Kind code	A1
Filing date	Jul 9, 2024
Priority date	Apr 28, 2023
Publication date	Nov 28, 2024
Grant date	—

Abstract

A cleaner includes an impeller that is rotated by a motor, wherein the impeller includes a boss portion, a base portion, and a plurality of blades arranged radially on the base portion to generate a suction force. Each of the plurality of blades has a pressure surface, which is a front surface of each of the plurality of blades with respect to a rotational direction of the impeller, wherein the pressure surface is curved concavely toward the rotational direction.

First claim

What is claimed is:

1 . A cleaner comprising:
a main body portion including a filtration chamber and an exhaust chamber; a dust case connected to the main body portion; an impeller disposed in the main body portion to generate a suction force within an air passage to suck air from the dust case into the main body portion through the air passage while being rotated; and a motor for rotating the impeller, wherein the motor includes a shaft and wherein the impeller comprises: a boss portion to which the shaft is fixed; a base portion that slopes downward from an upstream side of the air passage toward a downstream side of the air passage based on the boss portion, wherein the base portion has a diameter that gradually increases from the upstream side of the air passage toward the downstream side of the air passage; and a plurality of blades disposed radially on the base portion to generate the suction force within the air passage, wherein each of the plurality of blades has a pressure surface, which is a front surface of each of the plurality of blades with respect to a rotational direction of the impeller, and wherein the pressure surface is curved concavely toward the rotational direction.

2 . The cleaner of claim 1 , wherein
a length of a blade of the plurality of blades is expressed as a percentage, wherein when an end of the blade located adjacent to the boss portion is set to about 0% and an end of the blade located on an outside portion of the base portion in a diameter direction is set to about 100%, a minimum radius of curvature of a cross-sectional shape of the pressure surface becomes minimum at between about 60% and about 95% of a lengthwise direction of the blade.

3 . The cleaner of claim 1 , wherein
the base portion includes an inclined surface that slopes downward from the upstream side of the air passage toward the downstream side of the air passage and has a diameter that gradually increases from the upstream side of the air passage toward the downstream side of the air passage, the plurality of blades protrude from the inclined surface and extend to be shifted in a backward direction with respect to the rotational direction in a radial direction from the boss portion, and when the impeller rotates, air within the air passage flows from inside of the air passage to outside of the air passage in a diameter direction and slips out of the impeller through gaps disposed between the plurality of blades in a direction inclined with respect to a rotation axis, and thus a suction force is generated on the upstream side of the air passage.

4 . The cleaner of claim 1 , wherein
each of the plurality of blades includes a wind-cutting edge disposed close to the boss portion, wherein the wind-cutting edge includes a proximal end located on a side of the base portion and a protruding end spaced apart from the base portion, wherein each of the plurality of blades has a swept-back wing shape in which the protruding end is located behind the proximal end with respect to the rotation direction.

5 . The cleaner of claim 4 , wherein
a swept-back angle of the wind-cutting edge is about 30° to about 50°.

6 . The cleaner of claim 5 , wherein
the wind-cutting edge is inclined to protrude toward the upstream side of the air passage in a direction from the proximal end to the protruding end.

7 . The cleaner of claim 6 , wherein
an inclination angle of the wind-cutting edge is about 10° to about 30°.

8 . The cleaner of claim 7 , further including a shroud for forming the air passage,
wherein the shroud comprises: a moving blade portion having an inner diameter gradually increasing in a direction from an upstream side of the shroud to a downstream side of the shroud, in which the impeller is accommodated such that each of the plurality of blades faces an inner surface of the moving blade portion with a tip clearance disposed therebetween; a suction portion extending from the moving blade portion to the upstream side of the shroud, and a static blade portion extending from the moving blade portion to the downstream side of the shroud, and the motor, wherein the motor is disposed within the suction portion.

9 . The cleaner of claim 8 , wherein
an inner diameter of the suction portion gradually becomes smaller from the upstream side of the air passage to the downstream side of the air passage so that air flows along an inner surface of the suction portion from outside of the suction portion to inside of the suction portion in a diameter direction within the suction portion.

10 . The cleaner of claim 1 , comprising
a controller for controlling the motor, wherein the motor is disposed within the air passage to be located on an upstream side of the impeller, and the controller is disposed within the air passage to be located on an upstream side of the motor.

11 . An impeller disposed within an air passage to generate a suction force while being rotated by a motor, the impeller comprising:
a boss portion, wherein the boss portion is connected to a shaft of the motor; a base portion that slopes downward from an upstream side of the air passage toward a downstream side of the air passage based on the boss portion, and which has a diameter that gradually increases from the upstream side of the air passage toward the downstream side of the air passage; and a plurality of blades disposed radially on the base portion to generate a suction force within the air passage, wherein each of the plurality of blades has a pressure surface which is a front surface of each of the plurality of blades with respect to a rotational direction of the impeller, and wherein the pressure surface is curved concavely toward the rotational direction.

12 . The impeller of claim 11 , wherein
a length of a blade of the plurality of blades is expressed as a percentage, and when an end of the blade located adjacent to the boss portion is set to about 0% and an end of the blade located on outside portion of the blade in a diameter direction is set to about 100%, a minimum radius of curvature of a cross-sectional shape of the pressure surface becomes minimum at between about 60% and about 95% of a lengthwise direction of the blade.

13 . The impeller of claim 12 , wherein
the base portion includes an inclined surface that slopes downward from the upstream side of the air passage toward the downstream side of the air passage and has a diameter that gradually increases from the upstream side of the air passage toward the downstream side of the air passage, and the plurality of blades protrude from the inclined surface and extend to be shifted in a backward direction with respect to the rotational direction in a radial direction from the boss portion.

14 . The impeller of claim 11 , wherein
each of the plurality of blades includes a wind-cutting edge located close to the boss portion, wherein the wind-cutting edge includes a proximal end disposed on a side of the base portion and a protruding end spaced apart from the base portion, and wherein, each of the plurality of blades has a swept-back wing shape in which the protruding end is located behind the proximal end with respect to the rotational direction.

15 . The impeller of claim 14 , wherein
the wind-cutting edge is inclined to protrude toward the upstream side of the air passage in a direction from the proximal end to the protruding end.

16 . A cleaner comprising:
a main body portion including a filtration chamber and an exhaust chamber; a dust case connected to the main body portion; and an impeller disposed with

Assignees

• Samsung Electronics Co Ltd

Inventors

• Takada Masayuki
• Yoshida Minoru

Classifications

• A47L5/22

  with rotary fans · CPC title

• F04D29/281

  for fans or blowers · CPC title

• F04D29/701

  especially adapted for elastic fluid pumps · CPC title

• A47L5/28

  Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle (A47L5/24 takes precedence) · CPC title

• A47L9/127

  tube- or sleeve-shaped · CPC title