Air-conditioning apparatus

Patent metadata

Field	Value
Publication number	US-9759441-B2
Application number	US-201214119197-A
Country	US
Kind code	B2
Filing date	Mar 29, 2012
Priority date	Jun 10, 2011
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

The length of a cross flow fan in the rotational axis direction is longer than the length of an air outlet in the longitudinal direction, and the cross flow fan has a fan extension positioned beyond each end of the air outlet in the rotational axis direction. Deflectors are provided in the air-conditioning apparatus main body. An outlet airflow blown from each fan extension of the cross flow fan impinges upon a corresponding one of the deflector. Furthermore, the shape of blade portions of the fan extensions of the cross flow fan and the shape of blade portions opposing the air outlet are different from each other. The wind speed of the outlet airflow blown from the blade portion is lower than the wind speed of an outlet airflow blown from the blade portion.

First claim

The invention claimed is:

1. An air-conditioning apparatus comprising:
an indoor unit main body having
an air inlet through which indoor air is sucked, and
an air outlet from which air is blown, the air outlet being elongated in a horizontal direction of the indoor unit main body;

a cross flow fan provided in the indoor unit main body in which a length thereof in a rotational axis direction is longer than a length of the air outlet in a longitudinal direction such that the cross flow fan extends beyond both ends of the air outlet in the longitudinal direction and the rotational axis direction of the cross flow fan matches the horizontal direction of the indoor unit main body; and
deflectors provided in the indoor unit main body, the deflectors opposing airflows blown from extensions being portions of the cross flow fan, the extensions being positioned beyond the both ends of the air outlet in the longitudinal direction,
wherein the cross flow fan includes a plurality of individual impeller units, each of the plurality of individual impeller units has a plurality of blades provided in a circumferential direction of annular support plates, the plurality of individual impeller units includes a pair of individual impeller units positioned at the both ends of the longitudinal direction,
wherein each of the plurality of blades provided to the pair of individual impeller units comprises a first blade portion and a second blade portion,
wherein the first blade portion opposing the air outlet is differently shaped from the second blade portion in the extensions opposing the deflectors,
wherein the first blade portion and the second blade portion of the plurality of blades of the individual impeller unit are disposed between two of the annular support plates adjacent each other, and
wherein, in a section of each of the plurality of blades perpendicular to the rotational axis, for each of the plurality of blades,
in a case that a locus of rotation of an outer circumferential blade end portion is defined as blade outer diameter, that a line that extends in a center between a positive pressure surface as a negative pressure surface is defined as a camber line, the positive pressure surface being at a front in a rotational direction of the blade, the negative pressure surface being at a rear in the rotational direction of the blade, and that an angle formed between a tangent of the blade outer diameter and a tangent of the camber line at an intersection of the blade outer diameter and the camber line is defined as an outlet angle α,
an outlet angle αa of the second blade portion is smaller than an outlet angle αb of the first blade portions opposing the air outlet.

2. The air-conditioning apparatus of claim 1 ,
wherein, in a section of each of the plurality of blades perpendicular to the rotational axis, for each of the plurality of blades,
when a line segment that connects an outer circumferential blade end portion and an inner circumferential blade end portion is defined as a chord line M,
a length of a chord line Ma of the second blade portion is shorter than a length of a chord line Mb of the first blade portion opposing the air outlet.

3. The air-conditioning apparatus of claim 1 ,
wherein, for each of the plurality of blades,
a boundary portion between the second blade portion and the first blade portion opposing the air outlet has a blade shape of a straight line, a concave curve or a convex curve.

4. The air-conditioning apparatus of claim 1 ,
wherein the cross flow fan includes a plurality of the individual impeller units being connected to one another in the rotational axis direction.

5. The air-conditioning apparatus of claim 1 , further comprising
a heat exchanger provided in the indoor unit main body, the heat exchanger configured to heat-exchange with the indoor air sucked through the air inlet.

6. An air-conditioning apparatus comprising:
an indoor unit main body having
an air inlet through which indoor air is sucked, and
an air inlet from which air is blown, the air outlet being elongated in a horizontal direction of the indoor unit main body;

a cross flow fan provided in the indoor unit main body in which a length thereof in a rotational axis direction is longer than a length of the air outlet in a longitudinal direction such that the cross flow fan extends beyond both ends of the air outlet in the longitudinal direction and the rotational axis direction of the cross flow fan matches the horizontal direction of the indoor unit main body; and
deflectors provided in the indoor unit main body, the deflectors opposing airflows blown from extensions being portions of the cross flow fan, the extensions being positioned beyond the both ends of the air outlet in the longitudinal direction,
wherein the cross flow fan includes a plurality of individual impeller units, each of the plurality of individual impeller units has a plurality of blades provided in a circumferential direction of annular support plates, the plurality of individual impeller units includes a pair of individual impeller units positioned at the both ends of the pair longitudinal direction,
wherein each of the plurality of blades provided to the pair of individual impeller units comprises a first blade portion and a second blade portion,
wherein the first blade portion opposing the air outlet is differently shaped from the second blade portion in the extensions opposing the deflections,
wherein the first blade portion and the second blade portion of the plurality of blades of the individual impeller unit are disposed between two of the annular support plates adjacent each other,
wherein, in a section of each of the plurality of blades perpendicular to the rotational axis, for each of the plurality of blades,
in a case that a line that extends in a center between a positive pressure surface and a negative pressure surface is defined as a camber line, the positive pressure surface being at a front in a rotational direction of the blade, the negative pressure surface being at a rear in the rotational direction of the blade, and that a central angle of a sector, an arc of which is the camber line, is defined as a camber angle β,
a camber angle βa of the second blade portion is smaller than a camber angle βb the first blade portions opposing the air outlet.

7. The air-conditioning apparatus of claim 6 ,
wherein, in a section of each of the plurality of blades perpendicular to the rotational axis, for each of the plurality of blades,
when a line segment that connects an outer circumferential blade end portion and an inner circumferential blade end portion is defined as a chord line M,
a length of a chord line Ma of the second blade portion is shorter than a length of a chord line Mb of the first blade portion opposing the air outlet.

8. The air-conditioning apparatus of claim 6 ,
wherein, for each of the plurality of blades,
a boundary portion between the second blade portion and the first blade portion opposing the air outlet has a blade shape of a straight line, a concave curve or a convex curve.

9. The air-conditioning apparatus of claim 6 ,
wherein the cross flow fan includes a plurality of the individual impeller units being connected to one another in the rotational axis direction.

10. The air-conditioning apparatus of claim 6 , further comprising
a heat exchanger provided in the indoor unit main body, the heat exchanger configured to heat-exchange with the indoor air sucked through the air inlet.

Assignees

• Tadokoro Takahide
• Ikeda Takashi
• Hamada Shingo
• Shirota Mitsuhiro
• Mitsubishi Electric Corp

Inventors

• Tadokoro Takahide
• Ikeda Takashi
• Hamada Shingo
• Shirota Mitsuhiro

Classifications

• F24F1/0025

  Cross-flow or tangential fans · CPC title

• F04D29/4226

  Fan casings · CPC title

• F24F1/0011

  characterised by air outlets · CPC title

• F04D17/04 Primary

  of transverse-flow type · CPC title

• F24F13/24

  Means for preventing or suppressing noise · CPC title