Impeller of centrifugal fan and method and apparatus for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10697474-B2
Application number	US-201616065989-A
Country	US
Kind code	B2
Filing date	Aug 10, 2016
Priority date	Dec 28, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

An impeller of a centrifugal fan includes multiple blades arranged annularly around a rotational axis, a main plate, a shroud, main plate-side welded portions between main plate-side blade axial ends of the blades and the main plate, and shroud-side welded portions between shroud-side blade axial ends of the blades and the shroud. The main plate is arranged opposite to main plate-side blade axial ends. The shroud is arranged opposite to shroud-side blade axial ends. The main plate-side welded portions have main plate-side welding holes that are recesses extending through the main plate to portions of the main plate-side blade axial ends. The shroud-side welded portions have shroud-side welding holes that are recesses extending through the shroud to portions of the shroud-side blade axial ends.

First claim

What is claimed is:

1. An impeller of a centrifugal fan, the impeller comprising:
multiple blades arranged annularly around a rotational axis, each blade having two blade axial ends wherein both of the blade axial ends are along a direction of the rotational axis;
a main plate arranged opposite to a main plate-side blade axial end that is one of the two blade axial ends of each of the blades;
a shroud arranged opposite to a shroud-side blade axial end that is an other of the two blade axial ends of each of the blades,
main plate-side welded portions between each of the main plate-side blade axial ends and the main plate, the main plate-side welded portions having main plate-side welding holes extending completely through the main plate and partially through each of the main plate-side blade axial ends; and
shroud-side welded portions between each of the shroud-side blade axial ends and the shroud, the shroud-side welded portions having shroud-side welding holes extending completely through the shroud and partially through each of the shroud-side blade axial ends.

2. The impeller of the centrifugal fan according to claim 1 , wherein
the main plate has a blade-side main plate surface arranged opposite to each of the main plate-side blade axial ends and an opposite-blade-side main plate surface that is an opposite surface of the blade-side main plate surface along the direction of the rotational axis,
the opposite-blade-side main plate surface includes opposite-blade-side main plate protrusions at positions corresponding to each of the main plate-side blade axial ends,
the opposite-blade-side main plate protrusions include opposite-blade-side main plate recesses, and
the main plate-side welded portions are arranged on the opposite-blade-side main plate recesses.

3. The impeller of the centrifugal fan according to claim 1 , wherein
the shroud includes plate-shaped shroud flat plate portions disposed at positions corresponding to each of the shroud-side blade axial ends, and
the shroud-side welded portions are arranged on each of the corresponding shroud flat plate portions.

4. The impeller of the centrifugal fan according to claim 3 , wherein
the shroud flat plate portions are arranged opposite to the main plate-side welded portions along the direction of the rotational axis.

5. The impeller of the centrifugal fan according to claim 1 , wherein
the shroud has a blade-side shroud surface arranged opposite to the shroud-side blade axial ends and an opposite-blade-side shroud surface that is an opposite surface of the blade-side shroud surface along the direction of the rotational axis, and
the opposite-blade-side shroud surface includes shroud flat surfaces arranged opposite to the main plate-side welded portions along the direction of the rotational axis.

6. The impeller of the centrifugal fan according to claim 1 , further comprising:
unwelded portions located on the main plate-side blade axial ends or the main plate to secure gaps between each of the main plate-side blade axial ends and the main plate on a rear edge side of the blades with respect to the main plate-side welded portions.

7. The impeller of the centrifugal fan according to claim 1 , wherein
the main plate includes weir portions arranged along blade rear edge-side portions of each of the main plate-side blade axial ends.

Assignees

• Daikin Ind Ltd

Inventors

• Kumaou Shigeo

Classifications

• F04D29/626

  Mounting or removal of fans · CPC title

• F04D29/023 Primary

  especially adapted for elastic fluid pumps · CPC title

• F04D29/62

  of radial or helico-centrifugal pumps · CPC title

• B29C66/81433

  being toothed, i.e. comprising several teeth or pins (comprising a single tooth B29C66/81429), or being patterned · CPC title

• B29C66/81429

  comprising a single tooth · CPC title