Centrifugal fan and clothing dryer

Patent metadata

Field	Value
Publication number	US-11898573-B2
Application number	US-202017613618-A
Country	US
Kind code	B2
Filing date	May 13, 2020
Priority date	May 23, 2019
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A centrifugal fan and a dryer, where the centrifugal fan includes a shell, a driving mechanism, an impeller and a volute tongue arranged in the shell, the driving mechanism is connected with the tongue and can drive the tongue to rotate between a first limit position and a second limit position, the tongue includes a first volute tongue part and a second volute tongue part; when the tongue is located at the first limit position and the impeller rotates forwards, the first tongue part abuts against the inner wall of one side of the shell in a sealed mode, the second tongue part can cut the air blown by the impeller, and when the tongue is located at the second limit position and the impeller rotates reversely, the first tongue part can cut air blown by the impeller.

First claim

What is claimed is:

1. A centrifugal fan, comprising:
a housing,
a driving mechanism,
an impeller arranged in the housing, and
a volute tongue arranged in the housing and having a rotating shaft,
wherein the housing is provided with an air inlet and an air outlet, the driving mechanism is connected to the volute tongue via the rotating shaft and is capable of driving the volute tongue to rotate between a first limit position and a second limit position, and the volute tongue comprises a first volute tongue portion and a second volute tongue portion;
wherein the volute tongue has a periphery including a first curve surface, a second curve surface connected to the first curve surface at a first side edge, and a third curve surface connected to the first curve surface at a second side edge and to the second curve surface at a third side edge;
wherein the first side edge and the second side edge are positioned on opposite sides of the first curve surface, the third side edge is positioned between the first curve surface and the impeller, and the rotating shaft is positioned adjacent to the middle of the first curve surface;
wherein the first curve surface protrudes away from the impeller and both the second curve surface and the third curve surface protrude towards the first curve surface;
wherein the impeller is arranged to be capable of suctioning air into the housing from the air inlet when rotating, and the volute tongue is arranged to be capable of cutting the air blown from the impeller and guiding the air to the air outlet when the volute tongue is in the first limit position and the impeller is rotating in a forward direction; and wherein the volute tongue is further arranged to be capable of cutting the air blown from the impeller and guiding the air to the air outlet when the volute tongue is in the second limit position and the impeller is rotating in a reverse direction; and
wherein the first limit position is a position where the first volute tongue portion abuts against an inner wall of the housing via the first side edge on one side in a sealingly manner, and the second limit position is a position where the second volute tongue portion abuts against an inner wall of the housing on the other side in a sealingly manner.

2. The centrifugal fan according to claim 1 , wherein a first sealing structure is provided on the inner wall of the housing on one side, and a second sealing structure is provided on the inner wall of the housing on the other side; and wherein when the volute tongue is in the first limit position, the first volute tongue portion abuts against the first sealing structure in a sealingly manner, and when the volute tongue is in the second limit position, the second volute tongue portion abuts against the second sealing structure in a sealingly manner.

3. The centrifugal fan according to claim 2 , wherein the first sealing structure is a first sealing protrusion formed on the inner wall of the housing on the one side.

4. The centrifugal fan according to claim 2 , wherein the second sealing structure is a second sealing protrusion formed on the inner wall of the housing on the other side.

5. The centrifugal fan according to claim 1 , wherein the impeller comprises a plurality of straight vanes arranged annularly.

6. The centrifugal fan according to claim 5 , wherein the plurality of straight vanes are all arranged in a radial direction of the impeller.

7. The centrifugal fan according to claim 1 , wherein the impeller comprises a plurality of arc-shaped vanes arranged annularly.

8. The centrifugal fan according to claim 1 , wherein the driving mechanism comprises a driving member and a transmission member, the driving member is connected to the housing, the driving member is connected to the volute tongue through the transmission member, and the driving member is capable of driving the transmission member to cause the volute tongue to rotate.

9. The centrifugal fan according to claim 8 , wherein the driving member is a motor, the transmission member is a transmission belt, one end of the transmission belt is connected to an output shaft of the motor, and the other end of the transmission belt is connected to the volute tongue.

10. A dryer, comprising the centrifugal fan according to claim 1 .

Assignees

• Qingdao Haier Drum Washing Machine Co Ltd
• Haier Smart Home Co Ltd

Inventors

• Li Tao
• Lv Peishi
• Bing Jindong
• Cheng Rongfeng
• Yang Long

Classifications

• F04D29/281 Primary

  for fans or blowers · CPC title

• D06F58/20 Primary

  General details of domestic laundry dryers  (D06F59/00 takes precedence) · CPC title

• F04D17/08

  Centrifugal pumps · CPC title

• F04D29/4226

  Fan casings · CPC title

• F04D17/16 Primary

  for displacing without appreciable compression · CPC title