Title:
SCROLL CASING OF CENTRIFUGAL BLOWER, CENTRIFUGAL BLOWER PROVIDED WITH SCROLL CASING, AIR CONDITIONER, AND REFRIGERATION CIRCUIT DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/024267
Kind Code:
A1
Abstract:
This scroll casing comprises a scroll part that guides an airflow generated by a fan in a spiral, a discharge part having a discharge port that discharges the airflow, and a tongue part formed in a connection section between a spiral start part of the scroll part and the discharge part. In a cross section of an extension plate, which extends from a spiral end part in the discharge part, cut in the thickness direction, the extension plate, has a change point that, due to a change in the inclination of the extension plate, expands downstream more than upstream the expansion ratio of the cross-sectional area of a cross section of the discharge part that is orthogonal to the direction of the airflow. In the extension plate, an angle ϴ1 that is formed between a first part, which is a part further upstream than the change point, and a virtual line that passes through the change point and is parallel to the inner wall surface of a housing, and an angle ϴ2 that is formed between a second part, which is a part further downstream than the change point, and the virtual line, have the relationship 0 ≤ ϴ2 <ϴ1 or 0 <ϴ2 ≤ ϴ1. Furthermore, a distance L1, which is in a direction parallel to the virtual line between the upstream end part of the tongue part and the change point, and a distance L2, which is in a direction parallel to the virtual line between the change point and the downstream end part of the second part, have the relationship L2 < L1.
Inventors:
HAYASHI HIROYASU (JP)
TERAMOTO TAKUYA (JP)
YAMATANI TAKAHIRO (JP)
NAGANO TOMOHIRO (JP)
HARA YUKI (JP)
HORIE RYO (JP)
YAMAGUCHI TAKASHI (JP)
NAGANO KOTA (JP)
TERAMOTO TAKUYA (JP)
YAMATANI TAKAHIRO (JP)
NAGANO TOMOHIRO (JP)
HARA YUKI (JP)
HORIE RYO (JP)
YAMAGUCHI TAKASHI (JP)
NAGANO KOTA (JP)
Application Number:
PCT/JP2020/029089
Publication Date:
February 03, 2022
Filing Date:
July 29, 2020
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F04D29/44
Domestic Patent References:
| WO2018079776A1 | 2018-05-03 |
Foreign References:
| JPH1191334A | 1999-04-06 | |||
| CN102937112A | 2013-02-20 | |||
| JP2005069177A | 2005-03-17 |
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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