EP3690341B1

EP3690341B1 - Air conditioner indoor unit

Info

Publication number: EP3690341B1
Application number: EP18863185.7A
Authority: EP
Inventors: Shiori ISHIKAWA
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2017-09-27
Filing date: 2018-09-21
Publication date: 2022-08-10
Anticipated expiration: 2038-09-21
Also published as: WO2019065530A1; EP3690341A4; EP3690341A1; AU2018343291A1; AU2021206776A1; CN111051788B; AU2021206776B2; JP6515968B2; CN111051788A; JP2019060564A; ES2926176T3

Description

TECHNICAL FIELD

The present invention relates to an air conditioning indoor unit.

BACKGROUND ART

There has been conventionally adopted a method of adjusting an angle of an airflow direction adjusting blade in accordance with temperature of blow-out air in order to prevent dew condensation on the airflow direction adjusting blade. For example, Patent Literature 1 ( JP 2009-97755 A ) discloses an air conditioning indoor unit configured to detect air temperature passing a blow-out port, and turn an airflow direction adjusting blade to a position forming a dew condensation safety angle as a small angle to a predetermined blow-out direction in a case where dew condensation is determined as being formed on the airflow direction adjusting blade, and turn the airflow direction adjusting blade to a position forming an angle larger than the dew condensation safety angle to the predetermined blow-out direction in another case where dew condensation is determined as not being formed.
Further related art may be found in CN 204786798 U which describes an indoor apparatus of an air conditioner, in CN 105444387 A which describes an air outlet adjusting blade and an indoor unit of air conditioner and in WO 2017024637 A1 which describes an indoor unit of air conditioner and air conditioner.

SUMMARY OF THE INVENTION

An air conditioning indoor unit as described above accordingly has a narrower airflow direction adjusting range of blow-out air by an airflow direction adjusting blade when the blow-out air has a low temperature.
In view of this, it is an object of the present invention to provide an air conditioning indoor unit configured to have an airflow direction adjusting range wider than a conventional range, of blow-out air by an airflow direction adjusting blade even when the blow-out air has a low temperature.

The present invention is defined by appended independent claim 1. The dependent claims describe optional features and distinct embodiments. Any disclosure not falling under the ambit of said claims is thus not part of the present invention.
An air conditioning indoor unit according to a first aspect of the present disclosure is a wall-hung air conditioning indoor unit including an airflow direction adjusting blade configured to vertically adjust an airflow direction of blow-out air, in which the airflow direction adjusting blade has at least one through hole provided at a longitudinal end and allowing part of the blow-out air to pass in a thickness direction.
The blow-out air flowing along a lower surface of the airflow direction adjusting blade separates at around a curved portion of the lower surface during cooling operation. Dew condensation is formed where warm indoor air entering the curved portion joins cool blow-out air. Dew condensation is particularly likely to be formed at the end of the airflow direction adjusting blade.
The air conditioning indoor unit has the through hole allowing part of the blow-out air to pass in the thickness direction. Air passing the through hole flows toward a downstream end of the lower surface to attract the blow-out air flowing along the lower surface from an upstream end and prevent separation of the blow-out air from the lower surface. This prevents entry of the warm air for inhibition of dew condensation.
An air conditioning indoor unit according to a second aspect of the present disclosure is the air conditioning indoor unit according to the first aspect, in which the through hole is a long hole extending in a longitudinal direction of the airflow direction adjusting blade.
The air conditioning indoor unit has the through hole formed as the long hole extending in the longitudinal direction of the airflow direction adjusting blade to increase air passing the through hole and flowing toward the downstream end of the lower surface. This configuration more effectively attracts the blow-out air flowing along the lower surface from the upstream end, and is less likely to separate the blow-out air from the lower surface.
An air conditioning indoor unit according to a third aspect of the present disclosure is the air conditioning indoor unit according to the first or second aspect, in which the through hole guides part of the blow-out air in a forward and downward direction during cooling operation.
The air conditioning indoor unit guides part of the blow-out air in the forward and downward direction via the through hole, so that air passing the through hole is likely to flow toward the downstream end of the lower surface.
An air conditioning indoor unit according to a fourth aspect of the present disclosure is the air conditioning indoor unit according to any one of the first to third aspects, in which the through hole is inclined to extend downward toward a tip of the airflow direction adjusting blade.
An air conditioning indoor unit according to a fifth aspect of the present disclosure is the air conditioning indoor unit according to any one of the first to fourth aspects, in which the through hole is positioned between a downstream end and a center in a flow direction of the blow-out air, in the airflow direction adjusting blade.
An air conditioning indoor unit according to a sixth aspect of the present disclosure is the air conditioning indoor unit according to any one of the first to fifth aspects, and the air conditioning indoor unit further includes a perpendicular blade. The perpendicular blade has a vertical plane swung laterally to laterally adjust an airflow direction of air flowing toward the airflow direction adjusting blade. The through hole is at least partially located in a section from a region where a virtual plane including the vertical plane of the perpendicular blade located at a farthest end opposite to a swing direction of the perpendicular blade located at a maximum swung position crosses the airflow direction adjusting blade to a closest end, to the region, of the airflow direction adjusting blade.
In an exemplary case where the perpendicular blade is located at a maximum leftward swung position, air has a weak flow in the section on the right of the region where the virtual plane including the vertical plane of the perpendicular blade located at a rightmost position crosses the airflow direction adjusting blade, and its airflow is likely to separate from the lower surface of the airflow direction adjusting blade and allow entry of warm indoor air to form dew condensation.
The air conditioning indoor unit has the through hole provided in the section to allow air passing the through hole to flow toward the downstream end of the lower surface to attract the blow-out air flowing along the lower surface from the upstream end and prevent separation of the blow-out air from the lower surface. This prevents entry of the warm air for inhibition of dew condensation.
An air conditioning indoor unit according to a seventh aspect of the present disclosure is the air conditioning indoor unit according to any one of the first to sixth aspects, and the air conditioning indoor unit further includes a scroll configured to guide conditioned air to a blow-out port. When the conditioned air has a temperature (hereinafter, called a blow-out air temperature) within a range from 5°C to 15°C, a tangent line at a terminal end of the scroll and a virtual line connecting a front end and a rear end of the airflow direction adjusting blade form an angle within a range from 0 degrees to 35 degrees.
The angle of the airflow direction adjusting blade to a direction of the scroll is kept at an angle unlikely to cause separation of the blow-out air along the airflow direction adjusting blade during cooling operation, for inhibition of dew condensation on the airflow direction adjusting blade. When the airflow direction adjusting blade is postured to be inclined to have an angle causing separation due to a user's request, the blow-out air temperature needs to be increased to prevent dew condensation or achieve water retention when dew condensation is formed.
The air conditioning indoor unit has the through hole provided at the longitudinal end of the airflow direction adjusting blade and allowing part of the blow-out air to flow in the thickness direction. This configuration allows the airflow direction adjusting blade to be angled within the range from 0 degrees to 35 degrees even when the blow-out air temperature is decreased during cooling operation, to achieve excellent usability.

The air conditioning indoor unit according to the first aspect of the present disclosure has the through hole allowing part of the blow-out air to pass in the thickness direction. Air passing the through hole accordingly flows toward the downstream end of the lower surface to attract the blow-out air flowing along the lower surface from the upstream end and prevent separation of the blow-out air from the lower surface. This prevents entry of the warm air for inhibition of dew condensation.
The air conditioning indoor unit according to the second aspect of the present disclosure has the through hole formed as the long hole extending in the longitudinal direction of the airflow direction adjusting blade to increase air passing the through hole and flowing toward the downstream end of the lower surface. This configuration more effectively attracts the blow-out air flowing along the lower surface from the upstream end, and is less likely to separate the blow-out air from the lower surface.
The air conditioning indoor unit according to any one of the third to fifth aspects of the present disclosure guides part of the blow-out air in the forward and downward direction via the through hole, so that air passing the through hole is likely to flow toward the downstream end of the lower surface.
The air conditioning indoor unit according to the sixth aspect of the present disclosure has the through hole provided in the section on the right of the region where the virtual plane including the vertical plane of the perpendicular blade located at the rightmost position crosses the airflow direction adjusting blade when the perpendicular blade is located at the maximum leftward swung position. This configuration allows air passing the through hole to flow toward the downstream end of the lower surface to attract the blow-out air flowing along the lower surface from the upstream end and prevent separation of the blow-out air from the lower surface. This prevents entry of the warm air for inhibition of dew condensation.
The air conditioning indoor unit according to the seventh aspect of the present disclosure has the through hole provided at the longitudinal end of the airflow direction adjusting blade and allowing part of the blow-out air to flow in the thickness direction. This configuration allows the airflow direction adjusting blade to be angled within the range from 0 degrees to 35 degrees even when the blow-out air temperature is decreased to be equal to or less than 15°C during cooling operation, to achieve excellent usability.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a perspective view of an air conditioning indoor unit not in operation.
FIG. 1B is a perspective view of the air conditioning indoor unit in preparation for operation.
FIG. 2A is a side view of the air conditioning indoor unit not in operation.
FIG. 2B is a side view of the air conditioning indoor unit in preparation for operation.
FIG. 3 is a perspective view of the air conditioning indoor unit in operation.
FIG. 4 is a longitudinal sectional view of the air conditioning indoor unit not in operation.
FIG. 5 is a longitudinal sectional view of the air conditioning indoor unit in preparation for operation.
FIG. 6 is a longitudinal sectional view of the air conditioning indoor unit in operation.
FIG. 7 is a longitudinal sectional view of a panel conveyance mechanism.
FIG. 8 is a perspective view of a rear surface of a first panel.
FIG. 9A is an enlarged perspective view of a lock mechanism connecting the first panel and a movable link.
FIG. 9B is an enlarged perspective view depicting an unlocking state of the lock mechanism in FIG. 9A.
FIG. 10 is a partial perspective view of the air conditioning indoor unit in a case where the first panel is located at a maintenance position.
FIG. 11A is a perspective view of a panel support mechanism before a support operates.
FIG. 11B is a perspective view of the panel support mechanism after the support operates.
FIG. 12 is a front view of the panel support mechanism before the support operates.
FIG. 13A is a perspective view of a first airflow direction adjusting blade not in operation.
FIG. 13B is a perspective view of the first airflow direction adjusting blade in operation.
FIG. 14A is a sectional view taken along line X-X indicated in FIG. 13A.
FIG. 14B is an enlarged sectional view of a first concave portion.
FIG. 14C is an enlarged sectional view of a second concave portion.
FIG. 15 is a longitudinal sectional view of the air conditioning indoor unit, indicating an inclination angle of a second airflow direction adjusting blade.
FIG. 16A is a perspective view of the second airflow direction adjusting blade.
FIG. 16B is a sectional view taken along line Y-Y indicated in FIG. 16A.
FIG. 17 is a longitudinal sectional view of an air conditioning indoor unit not in operation according to a modification example.
FIG. 18 is a longitudinal sectional view of the air conditioning indoor unit before starting operation according to the modification example, including a panel conveyance mechanism in operation.
FIG. 19 is a longitudinal sectional view of the air conditioning indoor unit in operation according to the modification example.

DESCRIPTION OF EMBODIMENTS

An embodiment of the present invention will be described hereinafter with reference to the drawings. The following embodiment specifically exemplifies the present invention and is not intended to limit the technical scope of the present invention.

(1) Outline of air conditioning indoor unit 1

FIG. 1A is a perspective view of an air conditioning indoor unit 1 not in operation. FIG. 1B is a perspective view of the air conditioning indoor unit 1 in preparation for operation. FIG. 2A is a side view of the air conditioning indoor unit 1 not in operation. FIG. 2B is a side view of the air conditioning indoor unit 1 in preparation for operation. FIG. 3 is a perspective view of the air conditioning indoor unit 1 in operation. The air conditioning indoor unit 1 depicted in FIG. 1A, FIG. 1B, FIG. 2A, FIG. 2B, and FIG. 3 is of a wall-hung type, and includes an indoor unit body 10 and a front panel 11 covering a front surface of the indoor unit body 10.
As depicted in FIG. 1A and FIG. 2A, the air conditioning indoor unit 1 not in operation includes a blow-out port 5 having a front end entirely covered with a first panel 111 and a lower end entirely covered with a first airflow direction adjusting blade 30. This configuration does not allow the interior of the indoor unit body 10 to be visible via the blow-out port 5 to achieve excellent design.
As depicted in FIG. 1B and FIG. 2B, the first panel 111 in the front panel 11 shifts forward an upward to be disposed in front of a second panel 112 before the air conditioning indoor unit 1 starts operation, to allow the blow-out port 5 to be opened forward. As depicted in FIG. 3, the first airflow direction adjusting blade 30 positioned at the bottom of the indoor unit body 10 subsequently turns clockwise by 180 degrees to open the lower end of the blow-out port 5.

(2) Indoor unit body 10

FIG. 4 is a longitudinal sectional view of the air conditioning indoor unit 1 not in operation. FIG. 5 is a longitudinal sectional view of the air conditioning indoor unit 1 in preparation for operation. FIG. 6 is a longitudinal sectional view of the air conditioning indoor unit 1 in operation. As depicted in FIG. 4, FIG. 5, and FIG. 6, the indoor unit body 10 includes a body casing 100 constituting an outer contour, as well as the first airflow direction adjusting blade 30, a second airflow direction adjusting blade 40, and a perpendicular airflow direction adjusting blade 50 that are configured to adjust a blow-out direction of conditioned air. The body casing 100 accommodates an indoor heat exchanger 12, a fan 13, and a frame 16.

(2-1) Body casing 100

The body casing 100 has a front surface 101, an upper surface 102, and a lower surface 103, which form a substantially rectangular parallelepiped space accommodating the indoor heat exchanger 12, the fan 13, the frame 16, and a filter 9. The upper surface 102 is provided with an upper blow-in port 4A (see FIG. 10) including a plurality of slits. The blow-out port 5 extends from a lower portion of the front surface 101 to a front portion of the lower surface 103. The front surface 101 further includes a front blow-in port 4B disposed above the blow-out port 5.
The indoor heat exchanger 12 and the fan 13 are attached to the frame 16. The indoor heat exchanger 12 exchanges heat with passing air. The fan 13 causes air introduced via the upper blow-in port 4A and the front blow-in port 4B to reach and pass through the indoor heat exchanger 12 and then blow out of the blow-out port 5. The blow-out port 5 is provided with the first airflow direction adjusting blade 30 and the second airflow direction adjusting blade 40 configured to guide blow-out air in a vertical direction. The first airflow direction adjusting blade 30 is driven by a motor (not depicted) and is configured to change an air blow-out direction as well as open and close the blow-out port 5 adjacent to the lower surface 103.
The perpendicular airflow direction adjusting blade 50 is provided upstream of the first airflow direction adjusting blade 30 and the second airflow direction adjusting blade 40, and is configured to guide air in a lateral direction.
The filter 9 is disposed between the indoor heat exchanger 12 and the front surface 101 as well as the upper surface 102 of the body casing 100. The filter 9 removes dust contained in air flowing in toward the indoor heat exchanger 12.
The fan 13 operates to cause indoor air to flow via the upper blow-in port 4A, the front blow-in port 4B, the filter 9, and the indoor heat exchanger 12, be sucked into the fan 13, and then blow out of the blow-out port 5 via a blow-out flow path 18.

(2-2) First airflow direction adjusting blade 30

The first airflow direction adjusting blade 30 is positioned still to cover the lower end of the blow-out port 5 when the air conditioning indoor unit is not in operation. Such a position of the first airflow direction adjusting blade 30 will be called an initial position SP (see FIG. 4 and FIG. 5). The first airflow direction adjusting blade 30 located at the initial position SP has a lower surface that is constantly visible while the air conditioning indoor unit is not in operation and is thus finished to have excellent appearance. The lower surface will be called a decorative surface 30a.
At the initial position SP, the blow-out port 5 has an inner surface that is directed downward and is followed by blow-out air when the air conditioning indoor unit is in operation. The inner surface will be called a Coanda surface 30b.
The first airflow direction adjusting blade 30 is turned by a motor (not depicted). The first airflow direction adjusting blade 30 has a shaft (not depicted) positioned above the front end of the first airflow direction adjusting blade 30 located at the initial position SP by about a half of a height of the blow-out port 5.
As depicted in FIG. 6, the first airflow direction adjusting blade 30 rotated clockwise by 180 degrees projects forward from the upper end of the blow-out port 5 with the decorative surface 30a directed being upward and the Coanda surface 30b being directed downward.
The first airflow direction adjusting blade 30 will be described in detail later in a section "(5) Detailed description of first airflow direction adjusting blade 30".

(2-3) Second airflow direction adjusting blade 40

The second airflow direction adjusting blade 40 is positioned upstream of the blow-out port 5 and above the initial position SP of the first airflow direction adjusting blade 30 when the air conditioning indoor unit is not in operation. As depicted in FIG. 6, the second airflow direction adjusting blade 40 has an arc sectional shape having a convex surface 40a directed downward and a concave surface 40b directed upward during cooling operation. In order to generate a vertically downward air flow during heating operation, the second airflow direction adjusting blade 40 may be postured to have the convex surface 40a directed upward and the concave surface 40b directed downward.
The second airflow direction adjusting blade 40 is turned by a motor (not depicted). The second airflow direction adjusting blade 40 has a shaft (not depicted) positioned above the concave surface 40b.
The second airflow direction adjusting blade 40 will be described in detail later in a section "(6) Detailed description of second airflow direction adjusting blade 40".

(2-4) Perpendicular airflow direction adjusting blade 50

As depicted in FIG. 4, FIG. 5, and FIG. 6, the perpendicular airflow direction adjusting blade 50 includes a plurality of blade pieces 501 and a coupling rod 503 coupling the plurality of blade pieces 501. At the blow-out flow path 18, the perpendicular airflow direction adjusting blade 50 is positioned closer to the fan 13 in comparison to the first airflow direction adjusting blade 30 and the second airflow direction adjusting blade 40.
When the coupling rod 503 horizontally reciprocates in the longitudinal direction of the blow-out port 5, the plurality of blade pieces 501 laterally swings from a state perpendicular to the longitudinal direction. The coupling rod 503 is horizontally reciprocated by a motor (not depicted).

(3) Front panel 11

As depicted in FIG. 1A, FIG. 2A, and FIG. 4, the front panel 11 covers the front surface of the indoor unit body 10. The front panel 11 is divided into upper and lower portions, and includes the first panel 111 as the lower portion and the second panel 112 positioned above the first panel 111.
The first panel 111 and the second panel 112 constitute a design surface of the air conditioning indoor unit 1, and are similar to each other in pattern, color, or combination thereof.
The first panel 111 has different positioning between the case where the air conditioning indoor unit 1 is not in operation and the case where the air conditioning indoor unit 1 is in operation.
In a first case where the air conditioning indoor unit 1 is not in operation, the first panel 111 and the second panel 112 have surfaces vertically aligned on an identical vertical plane to be beautifully integrated to each other and achieve excellent appearance. The first panel 111 is set to be vertically longer than the second panel 112 in a front view. The second panel 112 has a vertical length set to be equal to a height of the front end of the blow-out port 5.
The first panel 111 and the blow-out port 5 have lower ends adjacent to each other as if the lower ends seem to be leveled in a front view. Similarly, the second panel 112 and the front surface 101 of the body casing 100 have upper ends adj acent to each other as if the upper ends seem to be leveled in a front view.
In a second case where the air conditioning indoor unit 1 starts operation, a panel conveyance mechanism 21 shifts forward and upward simultaneously the first panel 111 and shifts the first panel 111 until the upper end of the first panel 111 is leveled with the upper end of the second panel 112 in a front view. The front end of the blow-out port 5 is thus opened, and the front blow-in port 4B and the first panel 111 form a space for air introduction.
When the first panel 111 and the second panel 112 have the upper ends leveled with each other, the front panel 11 does not project upward from a top surface of the indoor unit body 10 when the air conditioning indoor unit is in operation without change in size of a product between the case where the air conditioning indoor unit is in operation and the case where the air conditioning indoor unit is not in operation in a front view.
Even in a case where a room ceiling surface and the upper surface of the air conditioning indoor unit 1 have distance restriction, a service person can mount the air conditioning indoor unit without paying attention to size of the product in operation. The upper end of the first panel 111 and the upper end of the second panel 112 do not need to be completely leveled in a front view, and have only to be adjacent to each other so as to seem to be leveled in the front view. The upper end of the first panel 111 can thus project slightly from the upper end of the second panel 112 in the front view.
As depicted in FIG. 2A and FIG. 2B, the upper end of a side surface 111a of the first panel 111 and the lower end of a side surface 112a of the second panel 112 face each other and are inclined forward and upward. Even when the first panel 111 shifts forward and upward simultaneously, the upper end of the side surface 111a of the first panel 111 and the lower end of the side surface 112a of the second panel 112 will not interfere with each other.

(3-1) Panel conveyance mechanism 21

The panel conveyance mechanism 21 is configured to cause the first panel 111 to shift forward and upward simultaneously, in other words, shift obliquely upward. For easier description, assume that the first panel 111 closes the front end of the blow-out port 5 at a close position CP (see FIG. 2A), and that the first panel 111 shifts vertically to have the upper end leveled with the upper end of the second panel 112 in a front view and opens the front end of the blow-out port 5 at an open position OP (see FIG. 2B).
FIG. 7 is a longitudinal sectional view of the panel conveyance mechanism 21. FIG. 11A and FIG. 11B are perspective views of a panel support mechanism 24 before and after a support 25 operates, and these figures also depicting the panel conveyance mechanism 21 will be referred to. As depicted in FIG. 7, FIG. 11A, and FIG. 11B, the panel conveyance mechanism 21 is obtained by applying a parallel crank mechanism. The panel conveyance mechanism 21 includes a first crank 211, a second crank 212, a movable link 213, and a fixed link 214.

(3-1-1) First crank 211

The first crank 211 is a resin member and has each end molded into a columnar or a tubular shape so as to serve as a shaft. There is provided a first shaft 211a positioned adjacent to the first panel 111 and rotatably retained by an upper end bearing 213a of the movable link 213. As depicted in FIG. 11A, the first shaft 211a according to the present embodiment is formed into a columnar projection.
There is further provided a second shaft 211b positioned adjacent to the indoor unit body 10 and coupled to an output shaft of a motor (not depicted). As depicted in FIG. 7, the second shaft 211b is provided behind the second panel 112. The output shaft of the motor according to the present embodiment receives a resin rod having a quadrilateral section, and the second shaft 211b has a center provided with a quadrilateral hole receiving the resin rod.
As depicted in FIG. 7, the first crank 211 includes a curved portion 211c. The curved portion 211c connects the first shaft 211a and the second shaft 211b, and extends to be distant obliquely downward from a virtual line (two-dot chain line KL) connecting the center of the first shaft 211a and the center of the second shaft 211b to have a minimum distance and is then curved to extend toward the virtual line.
When the first panel 111 is lifted upward to have the first shaft 211a positioned in front of the second panel 112, the first crank 211 approaches the lower end of the second panel 112. The curved portion 211c curves to avoid the lower end of the second panel 112 so as to prevent interference between the first crank 211 and the lower end of the second panel 112.

(3-1-2) Second crank 212

The second crank 212 is a resin member and has each end molded into a columnar or a tubular shape so as to serve as a shaft. There is provided a first shaft 212a positioned adj acent to the first panel 111 and rotatably retained by a lower end bearing 213b of the movable link 213. As depicted in FIG. 11A, the first shaft 212a according to the present embodiment is formed into a columnar projection.
There is further provided a second shaft 212b positioned adjacent to the indoor unit body 10 and rotatably retained by the lower end of the fixed link 214. As depicted in FIG. 7, the second shaft 212b according to the present embodiment is formed into a columnar projection.

(3-1-3) Movable link 213

The movable link 213 is an elongated resin member and is fixed in a vertical posture to the rear surface of the first panel 111. The movable link 213 has upper and lower ends each constituting a bearing. The upper end serves as the upper end bearing 213a receiving the first shaft 211a of the first crank 211, whereas the lower end serves as the lower end bearing 213b receiving the first shaft 212a of the second crank 212.
As depicted in FIG. 11A, the upper end bearing 213a according to the present embodiment has a bearing hole receiving the columnar projection of the first shaft 211a of the first crank 211. The lower end bearing 213b has a bearing hole receiving the columnar projection of the first shaft 212a of the second crank 212.

(3-1-4) Fixed link 214

The fixed link 214 is located adjacent to the indoor unit body 10, and does not need to have a specific shape but has only to be provided with at least a bearing for the second shaft 211b of the first crank 211 and a bearing for the second shaft 212b of the second crank 212.
In the present embodiment, the second shaft 211b of the first crank 211 is supported by the output shaft of the motor whereas the second shaft 212b of the second crank 212 is supported by a bearing 214b positioned below and distant by a predetermined length from the output shaft of the motor.

(3-2) Operation of first panel 111 at operation start

When the first panel 111 is in the state depicted in FIG. 4 and the motor rotates clockwise the second shaft 211b of the first crank 211, the first crank 211 turns clockwise. In this case, the first shaft 211a of the first crank 211 draws an arc around the second shaft 211b and lifts the movable link 213 upward.
The first crank 211 stops turning at a position where the virtual line connecting the first shaft 211a and the second shaft 211b is inclined upward by about 5 degrees from a horizontal direction. Such a stop position will be called a maximally turned position Rm of the first crank 211 (see FIG. 5 and FIG. 6).
The first shaft 211a of the first crank 211 and the upper end bearing 213a of the movable link 213 are rotatably connected to each other. The lower end bearing 213b of the movable link 213 and the first shaft 212a of the second crank 212 are rotatably connected to each other. The bearing 214b of the fixed link 214 and the second shaft 212b of the second crank 212 are rotatably connected to each other.
The movable link 213 lifted upward keeps the vertical posture and shifts upward to be distant from the indoor unit body 10.
In this case, the "virtual line connecting the first shaft 211a and the second shaft 211b" of the first crank 211 and a "virtual line connecting the first shaft 212a and the second shaft 212b" of the second crank 212 are substantially parallel to each other, and a "virtual line connecting the upper end bearing 213a and the lower end bearing 213b" of the movable link 213 and a "virtual line connecting the output shaft of the motor and the bearing 214b" of the fixed link 214 are substantially parallel to each other, so that these four virtual lines form a substantial parallelogram.
When the first crank 211 serves as a driver and rotates, the first panel 111 fixed to the movable link 213 can ascend or descend while being kept in parallel with the fixed link 214.
As depicted in FIG. 5 and FIG. 6, when the first crank 211 reaches the maximally turned position Rm, the first panel 111 is positioned in front of the second panel 112 and the upper ends of the first panel 111 and the second panel 112 are leveled in a front view.
The first panel 111 is set to be vertically longer than the second panel 112 in a front view. When the first panel 111 ascends to have the upper end leveled with the upper end of the second panel 112 in a front view, the first panel 111 covers the second panel 112 so that there seems to be a single panel.
The vertical length of the second panel 112 is equal to the height of the front end of the blow-out port 5. As depicted in FIG. 2B, when the first panel 111 ascends to reach the position (open position OP) where the upper end of the first panel 111 is leveled with the upper end of the second panel 112 in a front view, the front end of the blow-out port 5 is opened completely.
The first panel 111 may be conveyed from the open position OP to the close position CP by turning counterclockwise the first crank 211 of the panel conveyance mechanism 21 depicted in FIG. 5.

(4) Mechanism configured keep posture of first panel 111

The panel conveyance mechanism 21 operates when air conditioning indoor unit is in operation as well as upon maintenance such as cleaning of the filter 9. Upon maintenance such as cleaning of the filter 9, a user needs to turn the first panel 111 to cause the lower end of the first panel 111 to be distant from the indoor unit body 10 so as to open the front surface of the indoor unit body 10.
In this case, as depicted in FIG. 2A, the first panel 111 turned at the close position CP causes interference between the upper end of the side surface 111a of the first panel 111 and the lower end of the side surface 112a of the second panel 112 to generate squeak sound and damage to the first panel 111 and the second panel 112.
In order to prevent such defects, when the user opens the front surface of the indoor unit body 10 for maintenance of the filter 9 or the like, the first panel 111 is conveyed to the open position OP in the present embodiment. As depicted in FIG. 2B, the upper end of the side surface 111a of the first panel 111 and the lower end of the side surface 112a of the second panel 112 are distant from each other at the open position OP. Turn of the first panel 111 will not cause interference between the upper end of the side surface 111a of the first panel 111 and the lower end of the side surface 112a of the second panel 112 to prevent generation of squeak sound and damage to the first panel 111 and the second panel 112.
The user can manually convey the first panel 111 from the close position CP to the open position OP. The panel conveyance mechanism 21 is connected to the motor and such work is a burden of the user, so that the first panel 111 is preferably conveyed by the panel conveyance mechanism 21.
The panel conveyance mechanism 21 operates when an operation button 81 or a maintenance preparation button 83 preliminarily provided at a remote control device (see FIG. 3, hereinafter called a remote controller 80) of the air conditioning indoor unit 1 is turned ON.
Upon maintenance, the user initially turns ON the maintenance preparation button 83 to cause the panel conveyance mechanism 21 to shift the first panel 111 to the open position OP.
The user then turns the first panel 111 to have the lower end distant from the indoor unit body 10 in order to open the front surface of the indoor unit body 10. Because the movable link 213 of the panel conveyance mechanism 21 is coupled to the rear surface of the first panel 111, such a coupled state therebetween needs to be changed to a turnable state where the first panel 111 is solely turnable.
The rear surface of the first panel 111 and the movable link 213 of the panel conveyance mechanism 21 thus interpose a hinge mechanism 22, a lock mechanism 23, and the panel support mechanism 24.

(4-1) Hinge mechanism 22

The hinge mechanism 22 is configured to turn the first panel 111 about the upper end bearing 213a of the movable link 213 in order to open the front surface of the indoor unit body 10 (see FIG. 8).
Specifically, the hinge mechanism 22 is provided on the rear surface of the first panel 111 and retains the upper end bearing 213a of the movable link 213. The hinge mechanism 22 may alternatively be constituted by a shaft fitted to the upper end bearing 213a of the movable link 213 by snap fitting.
When the lower end of the first panel 111 is shifted to be distant from the indoor unit body 10, the first panel 111 turns about the upper end bearing 213a of the movable link 213.

(4-2) Lock mechanism 23

FIG. 8 is a perspective view of the lock mechanism 23 disposed on the rear surface of the first panel 111. FIG. 9A is an enlarged perspective view of the lock mechanism 23 between the first panel 111 and the movable link 213. FIG. 9B is an enlarged perspective view depicting an unlocking state of the lock mechanism 23 in FIG. 9A.
As depicted in FIG. 8, FIG. 9A, and FIG. 9B, the first panel 111 has a portion facing the lower end bearing 213b of the movable link 213 and provided with the lock mechanism 23 configured to restrain the lower end bearing 213b of the movable link 213. The lock mechanism 23 includes a claw 231, a spring 232, and a grip 233. The claw 231, the spring 232, and the grip 233 are made of same resin and is molded integrally in the present embodiment.

(4-2-1) Claw 231

The claw 231 slides along the rear surface of the first panel 111. The claw 231 has a claw tip 231a typically inserted to a hole 213h provided in a lower portion of the lower end bearing 213b of the movable link 213 to prevent the lower end bearing 213b from being distant from the rear surface of the first panel 111.

(4-2-2) Spring 232

The spring 232 biases upward the claw 231 such that the claw tip 231a of the claw 231 is not distant from the hole 213h provided in the lower portion of the lower end bearing 213b of the movable link 213. The spring 232 is made of resin and is molded into an arc beam shape. The spring 232 has a first end that is retained by the rear surface of the first panel 111 and will be called a free end 232a. The spring 232 has a second end that is fixed to the claw 231 and will be called a fixed end 232b. The claw 231 and the spring 232 provide a lock function of the lock mechanism 23 in the present embodiment.

(4-2-3) Grip 233

The grip 233 is hooked by a finger of the user and is connected to the lower end of the claw 231. The rear surface of the first panel 111 located at the open position OP and the indoor unit body 10 form a gap therebetween allowing entry of a hand of the user. When the user hooks by the finger and pulls the grip 233 downward, the claw 231 is descended and the claw tip 231a exits the hole 213h provided in the lower portion of the lower end bearing 213b of the movable link 213, so that the first panel 111 and the lower end bearing 213b of the movable link 213 become separable from each other. The grip 233 provides an unlock function of the lock mechanism 23 in the present embodiment.

(4-3) Panel support mechanism 24

FIG. 10 is a partial perspective view of the air conditioning indoor unit 1 in a case where the first panel 111 is located at a maintenance position. As depicted in FIG. 10, when the first panel 111 shifts to a position (hereinafter, called a "maintenance position MP") where the front surface of the indoor unit body 10 is opened, the first panel 111 needs to be retained at the maintenance position MP to allow the user to execute work with both hands.
The panel support mechanism 24 is configured to retain the first panel 111 at the maintenance position MP As depicted in FIG. 10, the panel support mechanism 24 includes a shaft 24a provided on the movable link 213 of the panel conveyance mechanism 21, and the support 25 turnably supported by the shaft 24a.

(4-3-1) Shaft 24a

FIG. 11A is a perspective view of the panel support mechanism 24 before the support 25 operates. FIG. 11B is a perspective view of the panel support mechanism 24 after the support 25 operates. FIG. 12 is a front view of the panel support mechanism 24 before the support 25 operates.
As depicted in FIG. 11A, FIG. 11B, and FIG. 12, the shaft 24a has a pin shape projecting outward from the both side surfaces of the movable link 213. The shaft 24a is provided within a section 213c connecting the upper end bearing 213a and the lower end bearing 213b of the movable link 213, between the center of the section 213c and the lower end bearing 213b.

(4-3-2) Support 25

The support 25 has an elongated shape having a section perpendicular to the longitudinal direction and recessed into a cornered U shape. The support 25 has an end provided with a shaft hole 25a receiving the shaft 24a.
For easier description, the end of the support 25 provided with the shaft hole 25a will be called a first end 251 and another end will be called a second end 252. When the shaft 24a is inserted to the shaft hole 25a at the first end 251, the support 25 is turnable relatively to the movable link 213.
In a case where the support 25 is pushed to come closer to the movable link 213 and turned, part of the section 213c of the movable link 213 is fitted to a recessed portion of the support 25, and the support 25 and the movable link 213 are overlapped with each other, so that the support 25 cannot be pushed any further.
In another case where the support 25 stops being pushed to come closer to the movable link 213, the support 25 turns to be distant from the movable link 213. As depicted in FIG. 11A, the support 25 has a center of gravity 25g positioned above and ahead (to be distant from the movable link 213) of the shaft 24a, and thus naturally turns to be distant from the movable link 213 unless being restrained.
The first end 251 has an end surface including an arc surface 251a having a central angle of 100 degrees around the shaft hole 25a and an inclined surface 251b projecting in the longitudinal direction of the support 25 from the arc surface 251a.
When the support 25 turns to be distant from the movable link 213 from the state where the part of the section 213c of the movable link 213 is fitted to the recessed portion of the support 25, the arc surface 251a and the inclined surface 251b turn simultaneously. The movable link 213 has a proceed blocking surface 213d shifted in a turning direction from the inclined surface 251b by 60 degrees and facing the inclined surface 251b.
When the support 25 turns by 60 degrees to be distant from the movable link 213, the inclined surface 251b touches the proceed blocking surface 213d to stop turn of the support 25.
While the lower end bearing 213b of the movable link 213 and the first panel 111 located at the open position OP are kept coupled to each other, the support 25 is interposed between the rear surface of the first panel 111 and the section 213c of the movable link 213 and thus stays still.

(4-3-3) Operation of support 25

When the grip 233 of the lock mechanism 23 is pulled downward (see FIG. 9B), the lower end bearing 213b of the movable link 213 and the first panel 111 are uncoupled, and the lower end of the first panel 111 is pulled by a hand of the user to be distant from the indoor unit body 10, the hinge mechanism 22 causes the first panel 111 to turn about the upper end bearing 213a of the movable link 213.
In a case where the first panel 111 starts turning to be distant from the indoor unit body 10, the support 25 simultaneously starts turning about the shaft 24a to follow the first panel 111. When the first panel 111 reaches the maintenance position MP, the support 25 turns by 60 degrees to be distant from the movable link 213 and the inclined surface 251b touches the proceed blocking surface 213d to stop turn of the support 25.
Even if the user releases the first panel 111 in this state, the second end 252 of the support 25 supports the rear surface of the first panel 111 to stop the first panel 111 at the maintenance position MP and open the front surface of the indoor unit body 10.
In another case where the first panel 111 is returned from an inclined posture upon maintenance to a vertical posture, the support 25 is temporarily lifted upward and the first panel 111 is then pushed with a hand, so that the second end 252 of the support 25 slides on the rear surface of the first panel 111 to approach the movable link 213 of the panel conveyance mechanism 21. Eventually, the part of the section 213c of the movable link 213 is fitted to the recessed portion of the support 25 and the support 25 and the movable link 213 are overlapped with each other, so that the support 25 cannot be pushed any further. The first panel 111 returns to the vertical posture at this point.
As depicted in FIG. 11A, FIG. 11B, and FIG. 12, the second end 252 is not located at a body end 25b of the support 25, but temporarily rises backward from a left side surface of the body end 25b of the support 25 in a front view in FIG. 12, is then bent leftward, and extends along a sheet surface (vertically). The second end 252 is closer to the indoor unit body 10 in comparison to the body end 25b.
The second end 252 deviates from the body end 25b of the support 25 as described above. Even if a buckling load is applied from the tip of the second end 252, the second end 252 warps to generate force shifting the body end 25b toward the indoor unit body 10. The support 25 inevitably has a moment toward the indoor unit body 10 in this case.
Even if the user erroneously pushes the first panel 111 without shifting the support 25 upward, the second end 252 of the support 25 warps upon receiving certain force and subsequently slides on the rear surface of the first panel 111 without causing damage.
As described above, the support 25 of the panel support mechanism 24 is accommodated to be overlapped with the movable link 213 of the panel conveyance mechanism 21 when the first panel 111 has the vertical posture at the close position CP and the open position OP, and descends by its own weight to support the first panel 111 when the first panel 111 has the inclined posture at the maintenance position MP

(4-3-4) Other application examples

The panel support mechanism 24 is also applicable to an air conditioning indoor unit including a front panel (including a front grille) configured not to be driven and be turned forward for maintenance of a filter, such as a floorstanding air conditioning indoor unit.
The present embodiment exemplifies the first panel 111 in the inclined posture at the maintenance position MP being supported by the support 25 that is shifted downward by its own weight from the movable link 213. The present invention should not be limited to such a configuration. For example, the support 25 may be turnably retained by the rear surface of the first panel 111 and may be configured to be shifted downward by its own weight from the first panel 111 and touch the movable link 213 to be stopped when the first panel 111 is inclined.

(5) Detailed description of first airflow direction adjusting blade 30

FIG. 13A is a perspective view of the first airflow direction adjusting blade 30 not in operation. FIG. 13B is a perspective view of the first airflow direction adjusting blade 30 in operation. FIG. 14A is a sectional view taken along line X-X indicated in FIG. 13A.
As depicted in FIG. 13A, FIG. 13B, and FIG. 14A, the first airflow direction adjusting blade 30 includes a heat insulator 31 made of expanded polystyrene and interposed between a first blade member 321 constituting the decorative surface 30a and a second blade member 322 constituting the Coanda surface 30b. The first blade member 321 and the second blade member 322 will be collectively called a "blade member 32".
The first airflow direction adjusting blade 30 is configured to adjust an airflow direction of blow-out air from the blow-out port 5 via the blow-out flow path 18. As depicted in FIG. 4, the first airflow direction adjusting blade 30 covers the lower end of the blow-out port 5 with the decorative surface 30a being directed just downward when the air conditioning indoor unit 1 is in an operation stop state.
As depicted in FIG. 6, the first airflow direction adjusting blade 30 rotates by 180 degrees about a shaft 30c when the air conditioning indoor unit 1 starts operation. The first airflow direction adjusting blade 30 reaches the upper end of the blow-out port 5 (see FIG. 14A) in this case. In order to avoid interference with the first panel 111, the first airflow direction adjusting blade 30 inevitably turns after the first panel 111 operates or in a manner of chasing the operation of the first panel 111.
For easier description, assume that the first airflow direction adjusting blade 30 rotates by 180 degrees about the shaft to reach a maximum open position MOP (see FIG. 6).
The first airflow direction adjusting blade 30 stays still at the maximum open position MOP with the decorative surface 30a being directed upward and the Coanda surface 30b being directed downward. During cooling operation, the front blow-in port 4B of the indoor unit body 10 is located above the decorative surface 30a and indoor air is sucked therethrough. The blow-out port 5 is located below the Coanda surface 30b and cool air blows out.

(5-1) Countermeasure against dew condensation at first airflow direction adjusting blade 30

The blow-out port 5 has an upper wall forming a slight gap from the decorative surface 30a to allow indoor air to easily enter. The second blade member 322 constituting the Coanda surface 30b is cooled by cool air during cooling operation, and the first blade member 321 constituting the decorative surface 30a is also cooled due to heat transfer, so that the decorative surface 30a has dew condensation.
Heat transfer in the thickness direction of the first airflow direction adjusting blade 30 is inhibited by the expanded polystyrene constituting the heat insulator 31. Accordingly, the first blade member 321 is cooled due to internal heat conduction of the first blade member 321 and the second blade member 322.
Cool air flows along the Coanda surface 30b of the first airflow direction adjusting blade 30 located at the maximum open position MOP. The cool air separates from the Coanda surface 30b at a distal end having change in arc curvature. Indoor air is caught by an eddy formed after separation and comes into contact with the first airflow direction adjusting blade 30 to form dew condensation.

(5-1-1) Concave portion 33

In order to prevent dew condensation as described above, the first airflow direction adjusting blade 30 is provided with concave portions 33 formed by reducing a thickness of the second blade member 322. The concave portions 33 are provided at both ends of the first airflow direction adjusting blade 30, and includes a first concave portion 331 and a second concave portion 332.
As depicted in FIG. 14A, when the first airflow direction adjusting blade 30 is located at the maximum open position MOP, the first concave portion 331 is positioned within a range of 20% of a lateral width of the first airflow direction adjusting blade 30, downstream of an upstream end 30up of the first airflow direction adjusting blade 30 in the flow of blow-out air.
When the first airflow direction adjusting blade 30 is located at the maximum open position MOP, the second concave portion 332 is positioned within a range of 20% of the lateral width of the first airflow direction adjusting blade 30 and upstream of a downstream end 30dp of the first airflow direction adjusting blade 30 in the flow of blow-out air.
FIG. 14B is an enlarged sectional view of the first concave portion 331. FIG. 14C is an enlarged sectional view of the second concave portion 332. As depicted in FIG. 14B and FIG. 14C, the first concave portion 331 and the second concave portion 332 are formed by reducing the thickness of the second blade member 322 by 35% to 60%. The first concave portion 331 and the second concave portion 332 have a minimum thickness t set within a range from 40% to 65% of the thickness of the second blade member 322 excluding the first concave portion 331 and the second concave portion 332.
The minimum thickness of the first concave portion 331 and the second concave portion 332 seems to be preferably as small as possible. The second blade member 322 according to the present embodiment is produced by resin injection molding, so that the minimum thickness is set within the range from 40% to 65% of the thickness of the second blade member 322 as a thickness allowing molten resin to reliably flow into a mold. The first concave portion 331 and the second concave portion 332 each have a bottom having a rear surface supported by the expanded polystyrene constituting the heat insulator 31 and having no deterioration in strength.
The first concave portion 331 and the second concave portion 332 each have a concave width set to include a concave bottom width w1 sized correspondingly to 40% to 65% of the thickness of the second blade member 322 and a concave entrance w2 sized correspondingly to 100% to 200% of the thickness of the second blade member 322, and the concave width is preferably set within a range from 0.6 mm to 2.4 mm.
Heat transferred through the second blade member 322 is blocked by the portions having the minimum thickness of the first concave portion 331 and the second concave portion 332, to inhibit temperature decrease in sections from the first concave portion 331 and the second concave portion 332 to the first blade member 321. This also inhibits temperature decrease at a portion in contact with warm indoor air to inhibit dew condensation.
The first concave portion 331 and the second concave portion 332 are not limited in terms of their numbers. It is preferred to provide two first concave portions 331 and one second concave portion 332 in view of the fact that a portion upstream of the flow of blow-out air tends to be cooled.
Some air conditioning indoor unit has a plurality of grooves at a portion hit by not blow-out air but indoor air. These grooves are provided to hold condensate to be evaporated by wind, and are completely different from the first concave portion 331 and the second concave portion 332 provided for reduction of heat transfer to a start point and an end point hit by cool air where the cool air and warm air separate from each other.

(5-1-2) Wall 34

The above description assumes that dew condensation is formed by cooled indoor air entering the gap between the upper wall of the blow-out port 5 and the decorative surface 30a as well as indoor air caught by the eddy formed after separation of cool air flowing along the Coanda surface 30b of the first airflow direction adjusting blade 30.
A phenomenon other than the above may form dew condensation. Specifically. the perpendicular airflow direction adjusting blade 50 may cause cool air flowing along the Coanda surface 30b of the first airflow direction adjusting blade 30 located at the maximum open position MOP (see FIG. 6) to hit a side wall out of walls constituting the blow-out port 5 to turn onto the decorative surface 30a.
The decorative surface 30a of the first airflow direction adjusting blade 30 located at the maximum open position MOP and the upper wall out of the walls constituting the blow-out port 5 form the gap having negative pressure that will cause cool air to flow upward to the decorative surface 30a, and dew condensation is formed in this case.
As depicted in FIG. 13A and FIG. 13B, the second blade member 322 according to the present embodiment has a lateral end in the longitudinal direction provided with a wall 34 rising in the thickness direction. When the perpendicular airflow direction adjusting blade 50 causes air to flow leftward and rightward, cool air flowing obliquely across the Coanda surface 30b of the first airflow direction adjusting blade 30 hits the wall 34 and flows below the side wall of the blow-out port 5, in which case there is generated no flow turning onto the decorative surface 30a of the first airflow direction adjusting blade 30. This configuration inhibits dew condensation.

(6) Detailed description of second airflow direction adjusting blade 40

In a state where the air conditioning indoor unit 1 is not in operation as depicted in FIG. 4, the second airflow direction adjusting blade 40 is positioned behind the first panel 111 located at the close position CP and above the first airflow direction adjusting blade 30 located at the initial position SP so as to be invisible.
In another state where the air conditioning indoor unit 1 is in operation as depicted in FIG. 6, the first panel 111 shifts to the open position OP to open the front end of the blow-out port 5 and the first airflow direction adjusting blade 30 turns to be positioned above the second airflow direction adjusting blade 40 to open the lower end of the blow-out port 5 to expose the second airflow direction adjusting blade 40 via the blow-out port 5.
FIG. 15 is a longitudinal sectional view of the air conditioning indoor unit 1, indicating an inclination angle of the second airflow direction adjusting blade 40. As depicted in FIG. 15, the second airflow direction adjusting blade 40 has the convex surface 40a directed downward and the concave surface 40b directed upward. Cool air flowing along the upper concave surface 40b thus flows upward toward the first airflow direction adjusting blade 30. Such a flow along the concave surface 40b will be called a main airflow.
Cool air flowing along the lower convex surface 40a keeps flowing along the convex surface 40a in parallel with the main airflow if the angle (hereinafter, referred to as an "inclination angle θ") of the second airflow direction adjusting blade 40 is within a predetermined angle range.
The inclination angle θ of the second airflow direction adjusting blade 40 indicates an angle of a virtual line BL including a frontmost end and a rearmost end of the second airflow direction adjusting blade 40 relative to a tangent line TL at a terminal end of a scroll 17.
When the inclination angle θ of the second airflow direction adjusting blade 40 is out of the predetermined angle range, cool air flows halfway along a curved surface and separates before becoming directed toward the first airflow direction adjusting blade 30 to be distant from the main airflow.
Cool air flowing along the convex surface 40a separates immediately after having passed a vertex of the convex surface 40a, or at the center of a section connecting the vertex and a downstream-side end of the convex surface 40a. Indoor air higher in temperature than the cool air not flowing along the convex surface 40a any more enters to form dew condensation.
A section connecting a deepest point and a downstream-side end of the concave surface 40b will be called a concave second half section 40bb, and a section connecting the vertex and the downstream-side end of the convex surface 40a will be called a convex second half section 40ab.
The applicant has tested to find that, when the perpendicular airflow direction adjusting blade 50 according to the present embodiment swings to the left or to the right, the convex second half section 40ab at each end of the second airflow direction adjusting blade 40 is likely to have dew condensation.

(6-1) Countermeasure against dew condensation at second airflow direction adjusting blade 40

As described above, cool air does not separate in the convex second half section 40ab and the second airflow direction adjusting blade 40 is entirely surrounded with cool air unless the inclination angle θ of the second airflow direction adjusting blade 40 does not exceed the predetermined angle, to prevent dew condensation at the second airflow direction adjusting blade 40.

(6-1-1) Relation between posture of second airflow direction adjusting blade 40 and blow-out air temperature

The applicant researched to find that dew condensation is inhibited in a case where the inclination angle θ of the second airflow direction adjusting blade 40 is within a range from 0 degrees to 5 degrees while blow-out air has a temperature Tb within a range from 12°C to 13°C.
In another case where the user prefers to have an inclination angle causing cool air to separate in the convex second half section 40ab, in other words, where the inclination angle θ of the second airflow direction adjusting blade 40 is set to be out of the range from 0 degrees to 5 degrees, the temperature Tb of blow-out air needs to be increased to a range from 14°C to 16°C for increase in dewpoint temperature, which narrows parameter flexibility.
The applicant aims to expand the range of the inclination angle θ of the second airflow direction adjusting blade 40 as well as inhibit dew condensation. In order to achieve such an object, cool air flowing along the convex surface 40a needs to flow without separating in the convex second half section 40ab.

(6-1-2) Through hole 43

In order to cause cool air to flow without separating in the convex second half section 40ab of the convex surface 40a, the second airflow direction adjusting blade 40 according to the present embodiment has a longitudinal end provided with a through hole 43 passing in the thickness direction of the second airflow direction adjusting blade 40. The through hole 43 will be described below with reference to the drawings.
FIG. 16A is a perspective view of the second airflow direction adjusting blade 40. FIG. 16B is a sectional view taken along line Y-Y indicated in FIG. 16A. As depicted in FIG. 16A and FIG. 16B, the through hole 43 is provided to cause cool air flowing along the concave second half section 40bb of the concave surface 40b to flow to the convex second half section 40ab of the convex surface 40a (see dotted arrows indicated in FIG. 16B).
The through hole 43 has an opening 43b provided in the concave second half section 40bb is positioned upstream of an opening 43a provided in the convex second half section 40ab. The through hole 43 thus extends forward and downward in an obliquely downward direction.
Provision of the through hole 43 causes part of cool air flowing along the concave surface 40b to pass through the through hole 43, flow out to the convex second half section 40ab, and flow toward the downstream-side end. This attracts cool air originally having flown along the convex second half section 40ab so as not to separate.
The through hole 43 is a long hole extending in the longitudinal direction of the second airflow direction adjusting blade 40. The through hole 43 is at least partially located in a section from a region where a virtual plane including a vertical plane 50a of the blade piece 501 located at a farthest end opposite to a swing direction of the perpendicular airflow direction adjusting blade 50 located at a maximum swung position in actual use crosses the second airflow direction adjusting blade 40 to the closest end, to the region, of the second airflow direction adjusting blade 40.
As depicted in FIG. 16A, the through hole 43 according to the present embodiment extends in a range of 20% of the entire longitudinal length from each end. In an exemplary case where the perpendicular airflow direction adjusting blade 50 is located at a maximum leftward swung position, air has a weak flow in a section on the right of the region where the virtual plane including the vertical plane 50a of the rightmost blade piece 501 crosses the second airflow direction adjusting blade 40 (e.g. a range of 80 mm from the right end), and the airflow is likely separate from the convex surface 40a of the second airflow direction adjusting blade 40 and is likely to come into contact with indoor air to form dew condensation.
When the through hole 43 is provided to extend in the range of 20% of the entire longitudinal length from each end, cool air having passed through the through hole 43 flows along the convex second half section 40ab of the convex surface 40a to attract cool air flowing from an upstream portion toward the convex second half section 40ab and prevent separation from the convex second half section 40ab. This prevents indoor air from contacting the second airflow direction adjusting blade 40 for inhibition of dew condensation.
The through hole 43 is provided as described above to inhibit dew condensation. The applicant thus researched to find that dew condensation is inhibited when the inclination angle θ of the second airflow direction adjusting blade 40 is within a range from 0 degrees to 32 degrees while the temperature Tb of blow-out air is within the range from 12°C to 13°C.
The through hole 43 is not necessarily the long hole, but may alternatively include a plurality of round holes provided continuously in one direction, or a plurality of "long holes shorter than the long hole according to the above embodiment" provided continuously in one direction.

(7) Modification example

In the front panel 11 according to the above embodiment, the second panel 112 is fixed and only the first panel 111 shifts to be positioned in front of the second panel 112 to open the front surface of the indoor unit body 10. The present invention should not be limited to this configuration, and both the first panel 111 and the second panel 112 may shift to open the front surface of the indoor unit body 10.
FIG. 17 is a longitudinal sectional view of an air conditioning indoor unit 1B not in operation according to the modification example. FIG. 18 is a longitudinal sectional view of the air conditioning indoor unit 1B before starting operation, including a panel conveyance mechanism in operation. FIG. 19 is a longitudinal sectional view of the air conditioning indoor unit 1B in operation. As depicted in FIG. 17, FIG. 18, and FIG. 19, the air conditioning indoor unit 1B according to the modification example is different from the air conditioning indoor unit according to the above embodiment in that the air conditioning indoor unit 1B includes a panel conveyance mechanism 21B configured to convey both the first panel 111 and the second panel 112.
The panel conveyance mechanism 21B is obtained by adding a convey mechanism for the second panel 112 to the panel conveyance mechanism 21 configured to convey the first panel 111. As depicted in FIG. 18, the panel conveyance mechanism 21B initially shifts the first panel 111 forward and upward, and shifts the second panel 112 horizontally to be distant from the indoor unit body 10 when the first panel 111 is distant from the indoor unit body 10 by a predetermined distance.
Eventually, the first panel 111 stops after shifting horizontally by a distance D1 and vertically by a distance HI from the indoor unit body 10 as depicted in FIG. 19. The second panel 112 stops after shifting horizontally from the indoor unit body 10 by a distance D2 shorter than the distance D1.
In the air conditioning indoor unit 1B in operation, the second panel 112 opens an upper front surface of the indoor unit body 10, and air passes between the upper front surface of the indoor unit body 10 and the second panel 112 to reach the front surface of the indoor unit body 10. This configuration shortens an air blow-in path from the front surface of the indoor unit body 10 to achieve reduction in air resistance.

(8) Characteristics

(8-1)
The air conditioning indoor unit 1 has the through hole 43 allowing part of the blow-out air to pass in the thickness direction of the second airflow direction adjusting blade 40. Air passing the through hole 43 accordingly flows toward the downstream end of the convex surface 40a during cooling operation to attract the blow-out air flowing along the convex surface 40a from the upstream end and prevent separation of the blow-out air from the convex surface 40a. This prevents entry of the warm air for inhibition of dew condensation.
(8-2)
The through hole 43 is formed as the long hole extending in the longitudinal direction of the second airflow direction adjusting blade 40 to increase air passing the through hole 43 and flowing toward the downstream end of the convex surface 40a. This configuration more effectively attracts the blow-out air flowing along the convex surface 40a from the upstream end, and is less likely to separate the blow-out air from the lower surface.
(8-3)
Part of the blow-out air is guided in the forward and downward direction via the through hole 43, so that air passing the through hole 43 is likely to flow toward the downstream end of the convex surface 40a.
(8-4)
The through hole 43 in the air conditioning indoor unit 1 is at least partially located in the section from the region where the virtual plane including the vertical plane 50a of the blade piece 501 located at the farthest end opposite to the swing direction of the perpendicular airflow direction adjusting blade 50 located at the maximum swung position in actual use crosses the second airflow direction adjusting blade 40 to the closest end, to the region, of the second airflow direction adjusting blade 40. Cool air passing the through hole 43 accordingly flows along the convex second half section 40ab of the convex surface 40a to attract cool air flowing from the upstream portion toward the convex second half section 40ab and prevent separation from the convex second half section 40ab. This prevents indoor air from contacting the second airflow direction adjusting blade 40 for inhibition of dew condensation.
(8-5)
The air conditioning indoor unit 1 has the through hole 43 provided at the longitudinal end of the second airflow direction adjusting blade 40 and allowing part of the blow-out air to flow in the thickness direction. This configuration allows the second airflow direction adjusting blade to be angled within the range from 0 degrees to 35 degrees when the blow-out air temperature is within the range from 5°C to 15°C, to achieve excellent usability.

INDUSTRIAL APPLICABILITY

The present invention is useful for a wall-hung air conditioning indoor unit as well as a floorstanding air conditioning indoor unit.

REFERENCE SIGNS LIST

1: air conditioning indoor unit
1B: air conditioning indoor unit
40: second airflow direction adjusting blade
43: through hole
50: perpendicular blade (perpendicular airflow direction adjusting blade)
50a: vertical plane

CITATION LIST

PATENT LITERATURE

Patent Literature 1: JP 2009-97755 A

Claims

An air conditioning indoor unit as a wall-hung air conditioning indoor unit including an airflow direction adjusting blade (40) configured to vertically adjust an airflow direction of blow-out air, wherein
the airflow direction adjusting blade (40) has at least one through hole (43) provided at a longitudinal end and allowing part of the blow-out air to pass in a thickness direction;

the through hole (43) is inclined to extend downward toward a tip of the airflow direction adjusting blade (40);

the through hole (43) is positioned between a downstream end and a center in a flow direction of the blow-out air, in the airflow direction adjusting blade (40); and

the air conditioning indoor unit being characterised by further comprising:
a perpendicular blade (50) having a vertical plane (50a) swung laterally to laterally adjust an airflow direction of air flowing toward the airflow direction adjusting blade (40), wherein

the through hole (43) is at least partially located in a section from a region where a virtual plane including the vertical plane (50a) of the perpendicular blade (50) located at a farthest end opposite to a swing direction of the perpendicular blade (50) located at a maximum swung position crosses the airflow direction adjusting blade (40) to a closest end, to the region, of the airflow direction adjusting blade (40).
The air conditioning indoor unit according to claim 1, wherein
the through hole (43) is a long hole extending in a longitudinal direction of the airflow direction adjusting blade (40).
The air conditioning indoor unit according to claim 1 or 2, wherein
the through hole (43) guides part of the blow-out air in a forward and downward direction during cooling operation.
The air conditioning indoor unit according to any one of claims 1 to 3, further comprising
a scroll configured to guide conditioned air to a blow-out port, wherein

when the conditioned air has a temperature within a range from 5°C to 15°C, a tangent line at a terminal end of the scroll and a virtual line connecting a front end and a rear end of the airflow direction adjusting blade form an angle within a range from 0 degrees to 35 degrees.