Propeller fan, and air blower, air conditioner, and hot-water supply outdoor unit including the same
US-2015176597-A1 · Jun 25, 2015 · US
Reversible flow fan
US10662973B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10662973-B2 |
| Application number | US-201715716018-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 26, 2017 |
| Priority date | Sep 29, 2016 |
| Publication date | May 26, 2020 |
| Grant date | May 26, 2020 |
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- Title
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- Abstract
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- Assignees and inventors
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Abstract
Official abstract text for this publication.
A reversible flow fan includes: an impeller that includes blade portions; and rear-edge curved portions disposed on surfaces on rear edge sides of the blade portions in a normal rotation direction of the impeller. The rear-edge curved portions are convexly curved from a center of the impeller toward directions of outer peripheral portions of the blade portions in airflow directions during a reverse rotation of the impeller.
First claim
Opening claim text (preview).
What is claimed is: 1. A reversible flow fan comprising: an impeller that includes blade portions; and a set of curved portions disposed on surfaces on either one of rear or front edge sides of each of the blade portions in a rotation direction of the impeller, wherein each of the curved portions is convexly curved from a center of the impeller toward directions of outer peripheral portions of the blade portions in airflow directions during a rotation of the impeller, the curved portion has an inflection point as a position where a curvature of the curved portion varies, the inflection point is positioned on a position apart from the center of the impeller by 70% to 90% of a length from the center of the impeller to the outer peripheral portion of the blade portion, an inclined angle of the curved portion in a direction of the impeller center with respect to the inflection point is in a range of −5° to +5°, and an inclined angle of the curved portion in a direction of the outer peripheral portion of the impeller with respect to the inflection point is in a range of +15° to +30°. 2. The reversible flow fan according to claim 1 , wherein each of the curved portions is disposed on surfaces on the rear edge sides of the blade portions in the rotation direction of the impeller. 3. The reversible flow fan according to claim 1 , wherein each of the curved portions is disposed on surfaces on the front edge sides of the blade portions in the rotation direction of the impeller. 4. The reversible flow fan according to claim 3 , further comprising: rear-edge curved portions disposed on surfaces on rear edge sides of the blade portions in the rotation direction of the impeller, wherein the rear-edge curved portions are convexly curved from the center of the impeller toward the directions of outer peripheral portions of the blade portions in the airflow directions during the reverse rotation of the impeller.
Assignees
Inventors
Classifications
related to the leading edge of a rotor blade · CPC title
- F04D29/386Primary
Skewed blades · CPC title
by means of rotor construction or layout, e.g. unequal distribution of blades or vanes · CPC title
- F04D19/005Primary
reversible fans · CPC title
- F04D29/384Primary
characterised by form · CPC title
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Frequently asked questions
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- What does patent US10662973B2 cover?
- A reversible flow fan includes: an impeller that includes blade portions; and rear-edge curved portions disposed on surfaces on rear edge sides of the blade portions in a normal rotation direction of the impeller. The rear-edge curved portions are convexly curved from a center of the impeller toward directions of outer peripheral portions of the blade portions in airflow directions during a rev…
- Who is the assignee on this patent?
- Sanyo Electric Co
- What technology area does this patent fall under?
- Primary CPC classification F04D29/386. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue May 26 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).