Air conditioner

• US 20020172588A1
• Filed: 05/09/2002
• Published: 11/21/2002
• Est. Priority Date: 09/29/2000
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Yoshihashi, MAkoto, Ikeda, Takashi, Tanabe, Yoshihiro, Nakagawa, Hidetomo, Morishita, Kunihiro
• Granted Patent: US 6,692,223 B2
• Time in Patent Office: Days
• US Class Current: 415/53.1
• CPC Class Codes: F04D 17/04 of transverse-flow type
• CPC Class Codes: F04D 29/30 Vanes
• CPC Class Codes: F04D 29/665 by means of resonance chambers or interference
• CPC Class Codes: F24F 1/0025 Cross-flow or tangential fans
• CPC Class Codes: F24F 1/0057 mounted in or on a wall
• CPC Class Codes: F24F 1/0063 by the mounting or arrangement of the heat exchangers
• CPC Class Codes: F24F 1/0067 by the shape of the heat exchangers or of parts thereof, e.g. of their fins
• CPC Class Codes: F24F 1/0073 characterised by the mounting or arrangement of filters
• CPC Class Codes: F24F 1/0083 with dehumidification means
• CPC Class Codes: F24F 13/24 Means for preventing or suppressing noise

Abstract

To obtain an air conditioning apparatus which provides a favorable atmosphere to the ear and saves energy even if the suction resistance of the impeller becomes high due to such as dust in the air conditioning apparatus. The air conditioning apparatus is provided with an impeller which is formed by a plurality of vanes and a ring for supporting the plurality of vanes, and includes a nozzle portion formed by a stabilizer and an air outlet, a cross flow fan formed by a guide wall, and a heat exchanger. The ratio H/φD2 of the outside diameter φD2 of the impeller to the height H of the air conditioning apparatus is 2.2 or above and 3.0 or below.

Claims

1. An air conditioning apparatus having a cross flow fan and a heat exchanger, the cross flow fan being provided with an impeller formed by a plurality of vanes and a ring for supporting the plurality of vanes, the cross flow fan being formed by a nozzle portion formed by a stabilizer and an outlet, and a guide wall, wherein a ratio H/φ

D2 of an outside diameter φ

D2 of the impeller to a height H of a main body of the air conditioning apparatus is 2.2 or above and 3.0 or below.

2. The air conditioning apparatus of claim 1, wherein the impeller of the cross flow fan includes a vane'"'"'s exit angle β

2 which is between 23 degrees and 30 degrees.

3. The air conditioning apparatus of claim 1 or 2, wherein a ratio tm/t2 of a maximum thickness tm of the vane of the impeller of the cross flow fan to a minimum thickness t2 of the vane is at least 1.5 or above and 3.5 or below so as to reduce singular noise generated in a frequency range lower than that of rotation noise, the minimum thickness t2 being a diameter of a peripheral end portion of the vane in a shape of a circular arc, and

wherein a thickness of the vane is gradually varied.

4. The air conditioning apparatus of claim 1, wherein a maximum thickness of a vane of the impeller of the cross flow fan is between 0.9 mm and 1.5 mm, and wherein a minimum thickness t2 of the vane of the impeller of the cross flow fan is between 0.2 mm and 0.6 mm, the minimum thickness t2 of the vane being a diameter of a peripheral end portion of the vane in a shape of a circular arc.

5. The air conditioning apparatus of claim 3, wherein the maximum thickness of the vane of the impeller of the cross flow fan is between 0.9 mm and 1.5 mm, and

wherein the minimum thickness t2 of the vane of the impeller of the cross flow fan is between 0.2 mm and 0.6 mm, the minimum thickness t2 being the diameter of the peripheral end portion of the vane in the shape of the circular arc.

6. The air conditioning apparatus of claim 1, wherein the vane of the impeller of the cross flow fan is formed into a shape of an edge obtained by cutting the vane along a circle passing through a peripheral end portion of the vane when a center of the circle is a center O of a rotating shaft of the impeller.

7. The air conditioning apparatus of claim 3, wherein the vane of the impeller of the cross flow fan is formed into a shape of an edge obtained by cutting the vane along a circle passing through the peripheral end portion of the vane when a center of the circle is a center O of a rotating shaft of the impeller.

8. The air conditioning apparatus of claim 1, wherein the plurality of vanes of the impeller of the cross flow fan is fitted with an irregular space between the vanes in pitch.

9. The air conditioning apparatus of claim 3, wherein the plurality of vanes of the impeller of the cross flow fan is fitted with an irregular space between the vanes in pitch.

10. The air conditioning apparatus of claim 1, wherein the stabilizer is formed at a lower front portion of the air conditioning apparatus in such a manner that an acute angle formed by a straight line, which connects a closest point of the stabilizer to the impeller of the cross flow fan to a center O of a rotating shaft of the impeller, and a horizontal line, which passes through the center O of the rotating shaft of the impeller, is between 30 degrees and 70 degrees.

11. The air conditioning apparatus of claim 1, wherein the stabilizer is formed in such a manner that an acute angle formed by two straight lines, which connect a center O of the impeller of the cross flow fan, respectively, to a closest point of the stabilizer to the impeller of the cross flow fan and to a lower portion of the stabilizer, is between 15 degrees and 40 degrees.

12. The air conditioning apparatus of claim 1, wherein the guide wall is formed at an upper rear portion of the air conditioning apparatus in such a manner that an angle θ

3 formed by a straight line connecting a closest point of the guide wall to the impeller of the cross flow fan and a center of a rotating shaft of the impeller and a horizontal line passing through the center O of the rotating shaft of the impeller, is between 35 degrees and 80 degrees.

13. The air conditioning apparatus of claim 1, wherein in a cross-sectional view at right angles to a line of a rotating shaft of the impeller of the cross flow fan, a shape of a peripheral end portion of the vane extends to a peripheral side of the impeller in a shape of an inclining parallelogram forward in a direction of rotation of the impeller, but the shape is not projecting outside a periphery of the ring for supporting the plurality of vanes.

14. The air conditioning apparatus of claim 1, wherein two vertexes of a peripheral end portion of the vane facing a peripheral side of the impeller are formed in a fixed shape of R when the vertexes extend to the peripheral side of the impeller in a shape of parallelogram.

15. The air conditioning apparatus of claim 1, wherein each of the plurality of vanes of the impeller of the cross flow fan is inclined by a fixed angle to a rotating shaft of the cross flow fan.

16. The air conditioning apparatus of claim 1, wherein a peripheral end portion of the vane of the impeller of the cross flow fan is formed by an elastic body.