Outdoor unit of air conditioner and refrigeration cycle device

Patent metadata

Field	Value
Publication number	US-10495328-B2
Application number	US-201515749826-A
Country	US
Kind code	B2
Filing date	Nov 2, 2015
Priority date	Nov 2, 2015
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A casing has a wall portion surrounding an impeller, as seen in an axial direction of a rotating shaft. The wall portion of the casing has a portion, and a portion located further away from a center of rotation of the rotating shaft than the portion, as seen in the axial direction. A curved portion has a curved surface portion located on a line connecting the center of rotation and the portion, and a curved surface portion located on a line connecting the center of rotation and the portion, as seen in the axial direction. A radius of curvature of the curved surface portion is greater than a radius of curvature of the curved surface portion.

First claim

The invention claimed is:

1. An outdoor unit of an air conditioner, comprising:
a casing having an air outlet port;
an impeller disposed in the casing and rotatable about a rotating shaft; and
a bell mouth surrounding an outer periphery of the impeller,
the bell mouth having
a straight pipe portion surrounding the outer periphery of the impeller, and
a curved portion located between the straight pipe portion and the air outlet port, and increasing in diameter from the straight pipe portion toward the air outlet port,

the casing having a wall portion surrounding the outer periphery of the impeller, as seen in an axial direction of the rotating shaft,
the wall portion having a first portion, and a second portion located further away from a center of rotation of the rotating shaft than the first portion, as seen in the axial direction,
the curved portion having a first curved surface portion located on a line connecting the center of rotation and the first portion, and a second curved surface portion located on a line connecting the center of rotation and the second portion, as seen in the axial direction, and
a radius of curvature of the second curved surface portion being greater than a radius of curvature of the first curved surface portion.

2. The outdoor unit of an air conditioner according to claim 1 , wherein
the curved portion is configured to maintain the radius of curvature of at least one of the first curved surface portion and the second curved surface portion in a circumferential direction around the center of rotation.

3. The outdoor unit of an air conditioner according to claim 1 , wherein
the casing has a front panel having the air outlet port, and
an end portion of the bell mouth is connected to the front panel.

4. A refrigeration cycle device comprising: a compressor to compress and discharge an introduced refrigerant; a condenser to condense the refrigerant compressed by the compressor; a restrictor device to reduce a pressure of the refrigerant condensed by the condenser; and an evaporator to evaporate the refrigerant reduced in pressure by the restrictor device,
the outdoor unit of an air conditioner according to claim 1 including one of the condenser and the evaporator.

5. An outdoor unit of an air conditioner, comprising:
a casing having an air outlet port;
an impeller disposed in the casing and rotatable about a rotating shaft; and
a bell mouth surrounding an outer periphery of the impeller,
the bell mouth having
a straight pipe portion surrounding the outer periphery of the impeller, and
a flared portion located between the straight pipe portion and the air outlet port, and increasing in diameter from the impeller toward the air outlet port,

the casing having a wall portion surrounding the impeller, as seen in an axial direction of the rotating shaft,
the wall portion having a first portion, and a second portion located further away from a center of rotation of the rotating shaft than the first portion, as seen in the axial direction,
the flared portion having a first extending portion located on a line connecting the center of rotation and the first portion, and a second extending portion located on a line connecting the center of rotation and the second portion, as seen in the axial direction, and
the first extending portion having a first dimension along the axial direction, the second extending portion having a second dimension along the axial direction, the second dimension being greater than the first dimension.

6. The outdoor unit of an air conditioner according to claim 5 , wherein
the flared portion is configured to maintain at least one of the first dimension and the second dimension in a circumferential direction around the center of rotation.

7. The outdoor unit of an air conditioner according to claim 5 , wherein
the bell mouth further has a curved portion located between the straight pipe portion and the flared portion, and
the curved portion has a curved surface, the curved surface connecting a wall surface of the straight pipe portion and a wall surface of the flared portion.

8. The outdoor unit of an air conditioner according to claim 7 , wherein
the curved portion has a first curved surface portion located on a line connecting the center of rotation and the first portion, and a second curved surface portion located on a line connecting the center of rotation and the second portion, as seen in the axial direction, and
a radius of curvature of the second curved surface portion is greater than a radius of curvature of the first curved surface portion.

9. The outdoor unit of an air conditioner according to claim 5 , wherein
the casing has a front panel having the air outlet port, and
an end portion of the bell mouth is connected to the front panel.

10. A refrigeration cycle device comprising: a compressor to compress and discharge an introduced refrigerant; a condenser to condense the refrigerant compressed by the compressor; a restrictor device to reduce a pressure of the refrigerant condensed by the condenser; and an evaporator to evaporate the refrigerant reduced in pressure by the restrictor device,
the outdoor unit of an air conditioner according to claim 5 including one of the condenser and the evaporator.

Assignees

• Mitsubishi Electric Corp

Inventors

• Yamamoto Katsuyuki
• Nakashima Seiji
• Ikeda Takashi

Classifications

• F24F1/40

  Vibration or noise prevention at outdoor units (for outdoor units compressors F24F1/12) · CPC title

• F24F1/38 Primary

  Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings · CPC title

• F04D19/002

  Axial flow fans · CPC title

• F04D29/547

  having a special shape in order to influence fluid flow · CPC title