Air conditioning indoor unit

Patent metadata

Field	Value
Publication number	US-9494329-B2
Application number	US-201214367117-A
Country	US
Kind code	B2
Filing date	Dec 26, 2012
Priority date	Dec 28, 2011
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

An air conditioning indoor unit includes a casing having an air outlet, a horizontal blade that changes an up and down direction flow of outlet air, a Coanda blade to change the outlet air to a Coanda airflow along an undersurface of the Coanda blade, and a control unit. The control unit adjusts a relative angle between the Coanda blade and the horizontal blade to selectively use either of a first airflow state and a second airflow state. In the first airflow state, the control unit adjusts the relative angle to a predetermined angle in a first angular range to produce the Coanda airflow on substantially an entire region of the undersurface of the Coanda blade. In the second airflow state, the control unit adjusts the relative angle to a predetermined angle in a second angular range larger than the first angular range to not produce the Coanda airflow.

First claim

What is claimed is:

1. An air conditioning indoor unit comprising:
a casing having an air outlet formed therein from which outlet air is blown out, and the casing having a front panel defining a front portion of the air conditioning indoor unit; a horizontal blade arranged and configured to change an up and down direction flow of the outlet air by a regulating surface;
a Coanda blade that utilizes the Coanda effect, which is a phenomenon in which the outlet air tends to flow in. a direction along an undersurface positioned in a direction out of and different from a flow direction of the outlet air, to change the outlet air between the undersurface of the Coanda blade and the regulating surface of the horizontal blade, of which air direction has been changed by the regulating surface of the horizontal blade, to a Coanda airflow along the undersurface of the Coanda blade; and
a control unit configured to control a motor coupled to the Coanda blade and a motor coupled to the horizontal blade so as to adjust a relative angle between the Coanda blade and the horizontal blade in such a way as to selectively position the blades according to selection of the airflow states, the airflow states including
a first airflow state, in which the control unit adjusts the relative angle to a predetermined angle in a first angular range to produce the Coanda airflow on substantially an entire region of the undersurface of the Coanda blade, and
a second airflow state, in which the control unit adjusts the relative angle to a predetermined angle in a second angular range larger than the first angular range to not produce the Coanda airflow,

a height position of a lower end portion of the Coanda blade becoming lower as an upper end portion of the Coanda blade moves away from the front panel of the casing.

2. The air conditioning indoor unit according to claim 1 , wherein
when the control unit adjusts the relative angle to a predetermined angle in a third angular range, a third airflow state results in which the Coanda airflow is produced on part of the undersurface of the Coanda blade, and
the first angular range and the second angular range are set in such a way as to exclude the third angular range.

3. The air conditioning indoor unit according to claim 2 , wherein
an upper limit angle of the first angular range is set to an angle equal to or less than an angle at which there is a transition from the third airflow state to the first airflow state when the relative angle has been gradually decreased from a predetermined angle in the second angular range.

4. The air conditioning indoor unit according to claim 2 , wherein
a lower limit angle of the second angular range is set to an angle equal to or greater than an angle at which there is a transition from the third airflow state to the second airflow state when the relative angle has been gradually increased from a predetermined angle in the first angular range.

5. The air conditioning indoor unit according to claim 2 , wherein
an angle at which there is a transition from the first airflow state to the third airflow state when the relative angle has been gradually increased from a predetermined angle in the first angular range and an angle at which there is a transition from the third airflow state to the first airflow state when the relative angle has been gradually decreased from a predetermined angle in the third angular range are different.

6. The air conditioning indoor unit according to claim 2 , wherein
an angle at which there is a transition from the second airflow state to the third airflow state when the relative angle has been gradually decreased from a predetermined angle in the second angular range and an angle at which there is a transition from the third airflow state to the second airflow state when the relative angle has been gradually increased from a predetermined angle in the third angular range are different.

7. The air conditioning indoor unit according to claim 1 , further comprising
a fan disposed inside the casing and arranged and configured to form an airflow in which air taken into the casing is channeled toward the air outlet,
the Coanda airflow being produced as a result of the outlet air being regulated by a regulating surface of the horizontal blade and thereafter flowing along the undersurface of the Coanda blade,
the casing including a scroll surface that extends from a back side of the fan to the air outlet and forms a lower portion of an outlet air flow path, and
in a case where the first airflow state is used, the regulating surface of the horizontal blade is set in such a way as to be in a position on an upper side of an imaginary extension plane of the scroll surface.

8. The air conditioning indoor unit according to claim 3 , wherein
a lower limit angle of the second angular range is set to an angle equal to or greater than an angle at which there is a transition from the third airflow state to the second airflow state when the relative angle has been gradually increased from a predetermined angle in the first angular range.

9. The air conditioning indoor unit according to claim 8 , wherein
an angle at which there is a transition from the first airflow state to the third airflow state when the relative angle has been gradually increased from a predetermined angle in the first angular range and an angle at which there is a transition from the third airflow state to the first airflow state when the relative angle has been gradually decreased from a predetermined angle in the third angular range are different.

10. The air conditioning indoor unit according to claim 8 , wherein
an angle at which there is a transition from the second airflow state to the third airflow state when the relative angle has been gradually decreased from a predetermined angle in the second angular range and an angle at which there is a transition from the third airflow state to the second airflow state when the relative angle has been gradually increased from a predetermined angle in the third angular range are different.

11. The air conditioning indoor unit according to claim 3 , wherein
an angle at which there is a transition from the first airflow state to the third airflow state when the relative angle has been gradually increased from a predetermined angle in the first angular range and an angle at which there is a transition from the third airflow state to the first airflow state when the relative angle has been gradually decreased from a predetermined angle in the third angular range are different.

12. The air conditioning indoor unit according to claim 11 , wherein
an angle at which there is a transition from the second airflow state to the third airflow state when the relative angle has been gradually decreased from a predetermined angle in the second angular range and an angle at which there is a transition from the third airflow state to the second airflow state when the relative angle has been gradually increased from a predetermined angle in the third angular range are different.

13. The air conditioning indoor unit according to claim 3 , wherein
an angle at which there is a transition from the second airflow state to the third airflow state when the relative angle has been gradually decreased from a predetermined angle in the second angular range and an angle at which there is a transition from the third airflow state to the second airflow state when the relative angle has been gradually increased from a predetermined angle in the third angular range are different.

14. The air conditioning indoor unit according to claim 4 , wherein
an angle at which there is

Assignees

• Daikin Ind Ltd

Inventors

• Yasutomi Masanao

Classifications

• F24F2221/28

  using the Coanda effect · CPC title

• F24F11/0078

  Mechanical Engineering · mapped topic

• F24F2001/0048

  Mechanical Engineering · mapped topic

• F24F1/0011 Primary

  characterised by air outlets · CPC title

• F24F7/007 Primary

  with forced flow (using ducting systems F24F7/06) · CPC title