Blower
US-8973576-B2 · Mar 10, 2015 · US
Multiblade centrifugal fan and air conditioner equipped with the same
US9334875B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9334875-B2 |
| Application number | US-201113806003-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 20, 2011 |
| Priority date | Oct 25, 2010 |
| Publication date | May 10, 2016 |
| Grant date | May 10, 2016 |
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- Title
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Abstract
Official abstract text for this publication.
Provided are a low-noise, high-performance multiblade centrifugal fan that suppresses interference between rotational flows generated within extension sections that are extended in a rotation-axis direction at upper and lower end surfaces of a scroll casing, and an air conditioner equipped with the same. In a multiblade centrifugal fan having an impeller disposed in a rotatable manner about a rotation shaft within a scroll casing having a flow path whose cross section gradually increases in a rotational direction, at least one of upper and lower end surfaces of the scroll casing serves as an inclined end surface that is extended in the extending direction of the rotation shaft such that an extended height thereof gradually increases in the rotational direction from a scroll start position, and a stepped section extending in the rotational direction is provided between the inclined end surface and an inner-peripheral side surface of an extension section.
First claim
Opening claim text (preview).
The invention claimed is: 1. A multiblade centrifugal fan having an impeller disposed in a rotatable manner about a rotation shaft within a scroll casing having a flow path whose cross section gradually increases in a rotational direction, wherein at least one of upper and lower end surfaces of the scroll casing serves as an inclined end surface that is extended in a rotation-axis direction such that an extended height thereof gradually increases in the rotational direction from a scroll start position of the scroll casing, wherein at least one stepped section extending in the rotational direction is provided between the inclined end surface and an inner-peripheral side surface of an extension section, and wherein the stepped section gradually decreases in size in a diffuser section formed in an outlet of the scroll casing, and the stepped section vanishes at an exit of the diffuser section. 2. The multiblade centrifugal fan according to claim 1 , wherein the lower end surface opposite the upper end surface that is provided with an inlet in the scroll casing serves as the inclined end surface that is extended in the rotation-axis direction such that the extended height thereof gradually increases in the rotational direction, and wherein the stepped section is provided between the inclined end surface and the inner-peripheral side surface of the extension section. 3. The multiblade centrifugal fan according to claim 1 , wherein each of the upper and lower end surfaces of the scroll casing serves as the inclined end surface that is extended in the rotation-axis direction such that the extended height thereof gradually increases in the rotational direction, and wherein the stepped section is provided between each inclined end surface and the inner-peripheral side surface of the extension section. 4. The multiblade centrifugal fan according to claim 1 , wherein the stepped section has a height and a width that gradually increase from an inclination start position of the inclined end surface toward a position in front of a tongue section of the scroll casing. 5. The multiblade centrifugal fan according to claim 1 , wherein an upper surface of the stepped section is downwardly inclined toward an outer periphery. 6. The multiblade centrifugal fan according to claim 1 , wherein the stepped section is provided with an even number of steps. 7. An air conditioner having the multiblade centrifugal fan according to claim 1 installed therein as an air-blowing fan.
Assignees
Inventors
Classifications
especially adapted for elastic fluid pumps · CPC title
especially adapted for elastic fluid pumps · CPC title
- F04D29/4226Primary
Fan casings · CPC title
Outlet · CPC title
Means for preventing or suppressing noise · CPC title
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Frequently asked questions
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- What does patent US9334875B2 cover?
- Provided are a low-noise, high-performance multiblade centrifugal fan that suppresses interference between rotational flows generated within extension sections that are extended in a rotation-axis direction at upper and lower end surfaces of a scroll casing, and an air conditioner equipped with the same. In a multiblade centrifugal fan having an impeller disposed in a rotatable manner about a r…
- Who is the assignee on this patent?
- Sato Seiji, Eguchi Tsuyoshi, Suzuki Atusi, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification F04D29/4226. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue May 10 2016 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).