JP6065959B1 - air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioning indoor unit in which an airflow flowing along a floor surface is suppressed from rising even if the floor surface is not sufficiently warmed. In the air-conditioning indoor unit 10, the temperature of the airflow flowing along the floor surface from the wall surface in the wall airflow mode is lowered by lowering the blown air temperature. However, the rising of the airflow flowing along the floor surface can be suppressed more than before. In addition, since the wall airflow is an airflow that crawls along the floor surface from the wall surface and does not hit the resident, it is difficult for the resident to feel uncomfortable even if the temperature falls. [Selection] Figure 12D

Description

  The present invention relates to an air conditioning indoor unit.

  In recent years, in the field of air conditioning, efforts have been made to improve the comfort of the air-conditioned space by controlling various air directions of the blown air. For example, in the air conditioner described in Patent Document 1 (Japanese Patent Application Laid-Open No. 6-109312), when the floor surface temperature is low, the living space is quickly and efficiently warmed by directing warm air toward the center of the floor surface. In a saturated steady state, hot air that flows downward along the wall surface is blown out so that the occupant is not exposed to hot air without lowering the temperature of the living space.

  However, in the above air conditioner, when the floor surface is not sufficiently warmed up, the warm air flowing from the wall surface to the floor surface may rise and hit the resident.

  The subject of this invention is providing the air-conditioning indoor unit which suppressed that the airflow which flows along a floor surface rises even if the floor surface is not fully warmed by any chance.

  An air-conditioning indoor unit according to a first aspect of the present invention is a wall-mounted air-conditioning indoor unit that is installed on a side wall of an air-conditioning target space and has a function of changing a wind direction of blown air blown from a blowout port. Switching means and a control unit are provided. The wind direction switching means changes the wind direction of the blown air. The control unit executes a plurality of airflow modes via the wind direction switching means. The plurality of airflow modes include a mode in which the blown air is made into an airflow corresponding to each of a plurality of preset wind directions, and a wall airflow mode is included therein. The wall airflow mode is a mode in which the blown air is turned into an airflow that flows along the side wall and the floor of the air-conditioning target space during the heating operation. The control unit performs blown air temperature suppression control. The blown air temperature suppression control is a control for lowering the temperature of the blown air when the wall airflow mode is executed than when executing the other airflow modes in the heating operation.

  In this air conditioning indoor unit, the temperature of the airflow flowing along the floor surface from the wall surface in the wall airflow mode is lowered by lowering the blown air temperature, so even if the floor surface is not sufficiently warmed, The rise of the airflow flowing along the surface can be suppressed as compared with the conventional case. In addition, since the wall airflow is an airflow that crawls along the floor surface from the wall surface and does not hit the resident, it is difficult for the resident to feel uncomfortable even if the temperature falls.

  The air conditioning indoor unit according to the second aspect of the present invention is the air conditioning indoor unit according to the first aspect, and further includes an indoor heat exchanger that functions as a condenser during heating operation. The control unit lowers the temperature target value of the indoor heat exchanger in the blown air temperature suppression control.

  In this air conditioning indoor unit, in the blown air temperature suppression control, the target temperature of the indoor heat exchanger 13 through which the blown air passes is controlled, so that the followability of the blown air temperature with respect to the target temperature is improved.

  The air conditioning indoor unit according to the third aspect of the present invention is the air conditioning indoor unit according to the first aspect or the second aspect, and the plurality of airflow modes include a first airflow mode and a second airflow mode. Yes. The first airflow mode is a mode in which the blown air is turned forward and downward. The second airflow mode is a mode in which the blown air is made to be an airflow that faces downward from the first airflow mode toward the floor surface of the air-conditioning target space. The controller executes the wall airflow mode after sequentially executing the first airflow mode and the second airflow mode.

  In this air conditioning indoor unit, first, the entire air-conditioning target space is warmed in the first airflow mode to a room temperature that satisfies the user. Next, in order to suppress the airflow soaring when shifting to the wall airflow mode due to the low floor temperature, the back side is warmed from the center of the floor in the second airflow mode. As a result, even if the mode is shifted to the wall airflow mode, the airflow is suppressed from rising.

  The air conditioning indoor unit according to the fourth aspect of the present invention is the air conditioning indoor unit according to the third aspect, and the plurality of airflow modes further include a third airflow mode. The third airflow mode is a mode in which the blown air is changed to an airflow toward the lower portion of the side wall. The controller executes the wall airflow mode after sequentially executing the first airflow mode, the second airflow mode, and the third airflow mode.

  In this air conditioning indoor unit, first, the entire air-conditioning target space is warmed in the first airflow mode to a room temperature that satisfies the user. Next, in order to suppress the airflow soaring when shifting to the wall airflow mode due to the low floor temperature, the back side is warmed from the center of the floor in the second airflow mode. Furthermore, in order to prevent the thermo-off caused by the airflow rising just below the air-conditioning indoor unit due to the low temperature in front of the floor, the floor in front is warmed in the third airflow mode. As a result, even when the mode is changed to the wall airflow mode, the airflow is further suppressed from being suppressed, and unnecessary thermo-off is prevented.

  An air conditioning indoor unit according to a fifth aspect of the present invention is the air conditioning indoor unit according to the fourth aspect, and the control unit includes an indoor temperature that is a temperature of the air-conditioning target space, and a set temperature that is a target value of the indoor temperature. Find the temperature difference. Furthermore, the control unit shifts the airflow mode from the first airflow mode to the second airflow mode when the absolute value of the temperature difference becomes equal to or less than the first threshold during execution of the first airflow mode, and during execution of the second airflow mode. When the absolute value of the temperature difference becomes equal to or less than the second threshold, the airflow mode is shifted from the second airflow mode to the third airflow mode.

  In this air conditioning indoor unit, since the first air flow mode is sequentially shifted to the third air flow mode based on the temperature difference between the set temperature and the room temperature, the wall air flow mode is set after waiting for the indoor temperature to reach a comfortable temperature. Can be migrated.

  An air conditioning indoor unit according to a sixth aspect of the present invention is the air conditioning indoor unit according to the fourth aspect, wherein the airflow mode is changed to the third airflow mode after the first predetermined time has elapsed since the control unit shifted to the third airflow mode. To wall flow mode.

  In this air conditioning indoor unit, since the first air flow mode is sequentially shifted to the third air flow mode based on the temperature difference between the set temperature and the room temperature, the indoor temperature becomes a comfortable temperature, and the floor surface directly under the air conditioning indoor unit is Since the third airflow mode is shifted to the wall airflow mode after warming up, the rising of the airflow is further suppressed.

  An air conditioner indoor unit according to a seventh aspect of the present invention is the air conditioner indoor unit according to the fifth aspect, wherein the control unit has passed the second predetermined time after the transition to the wall air flow mode. When the absolute value of the temperature difference between the room temperature and the set temperature exceeds the third threshold by the time, the next transition to the wall airflow mode is delayed.

  In this air conditioning indoor unit, depending on the load, the supply capacity is insufficient after the transition to the wall airflow mode, and the wall airflow mode may have to be stopped immediately. The transition condition to the airflow mode is made strict and the transition is delayed to avoid such a situation.

  In the air conditioning indoor unit according to the first aspect of the present invention, the temperature of the airflow flowing along the floor surface from the wall surface in the wall airflow mode is lowered by lowering the blown air temperature, so that the floor surface is not sufficiently warmed by any chance. Even if it is a case, the rising of the airflow which flows along a floor surface can be suppressed rather than before.

  In the air-conditioning indoor unit according to the second aspect of the present invention, in the blown air temperature suppression control, the target temperature of the indoor heat exchanger 13 through which the blown air passes is controlled to follow the blown air temperature with respect to the target temperature. Sexuality is improved.

  In the air-conditioning indoor unit according to the third aspect of the present invention, first, the entire air-conditioned space is warmed in the first airflow mode to a room temperature that satisfies the user. Next, in order to suppress the airflow soaring when shifting to the wall airflow mode due to the low floor temperature, the back side is warmed from the center of the floor in the second airflow mode. As a result, even if the mode is shifted to the wall airflow mode, the airflow is suppressed from rising.

  In the air conditioning indoor unit according to the fourth aspect of the present invention, first, the entire air-conditioning target space is warmed in the first air flow mode to a room temperature that satisfies the user. Next, in order to suppress the airflow soaring when shifting to the wall airflow mode due to the low floor temperature, the back side is warmed from the center of the floor in the second airflow mode. Furthermore, in order to prevent the thermo-off caused by the airflow rising just below the air-conditioning indoor unit due to the low temperature in front of the floor, the floor in front is warmed in the third airflow mode. As a result, even when the mode is changed to the wall airflow mode, the airflow is further suppressed from being suppressed, and unnecessary thermo-off is prevented.

  In the air conditioning indoor unit according to the fifth aspect of the present invention, the room temperature is changed to the comfortable temperature because the first air flow mode is sequentially shifted to the third air flow mode based on the temperature difference between the set temperature and the room temperature. You can wait for a transition to wall airflow mode.

  In the air conditioning indoor unit pertaining to the sixth aspect of the present invention, since the first air flow mode is sequentially shifted to the third air flow mode based on the temperature difference between the set temperature and the room temperature, the room temperature becomes a comfortable temperature, and the air conditioning Since the third airflow mode is shifted to the wall airflow mode after the floor surface directly below the indoor unit is warmed, the airflow is further suppressed.

  In the air conditioning indoor unit according to the seventh aspect of the present invention, such a situation occurs because there is a possibility that the supply capacity is insufficient after the transition to the wall airflow mode depending on the load and the wall airflow mode must be stopped immediately. In such a case, the transition condition to the next wall airflow mode is tightened to delay the transition, thereby avoiding such a situation.

The block diagram of the air conditioner which concerns on one Embodiment of this invention. The perspective view of the air-conditioning indoor unit of an air conditioner. Sectional drawing of the air-conditioning indoor unit in FIG. Air conditioner control block diagram FIG. 4 is an enlarged cross-sectional view of a front flap and a rear flap in FIG. 3. Sectional drawing of the air-conditioning indoor unit at the time of operation stop. Sectional drawing of the air-conditioning indoor unit at the time of the front downward airflow mode using a sub front flap. FIG. 8 is an enlarged cross-sectional view of a front flap, a sub-front flap, and a rear flap in FIG. 7. Sectional drawing of the air-conditioning indoor unit at the time of the front downward airflow mode which does not utilize a sub front flap. The fragmentary sectional view of the air-conditioning indoor unit at the time of circulation airflow mode. The fragmentary sectional view of the air-conditioning indoor unit at the time of intermediate airflow mode. Explanatory drawing showing the 1st airflow mode performed by preliminary operation. Explanatory drawing showing the 2nd airflow mode performed by preliminary operation. Explanatory drawing showing the 3rd airflow mode performed by preliminary operation. Explanatory drawing showing the wall airflow mode performed by insensitive airflow driving | operation. The control flowchart from a preliminary operation to the start of an insensitive airflow operation. The control flowchart from an insensitive airflow driving | operation start to completion | finish. The control flowchart from the preliminary | backup operation of a modification to the insensitive airflow operation start. The block diagram which shows the conditions which transfer to 1st airflow mode from wall airflow mode. The graph which shows the change from the 1st airflow mode in the 1st modification to wall airflow mode, and the change of room temperature and effective floor average temperature.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

(1) Configuration of Air Conditioner 1 FIG. 1 is a configuration diagram of an air conditioner 1 according to an embodiment of the present invention. In FIG. 1, an air conditioner 1 is an air conditioner capable of cooling operation and heating operation, and is a liquid for connecting an air conditioner indoor unit 10, an air conditioner outdoor unit 70, an air conditioner outdoor unit 70, and an air conditioner indoor unit 10. A refrigerant communication pipe 7 and a gas refrigerant communication pipe 9 are provided.

(1-1) Air conditioner outdoor unit 70
In FIG. 1, the air conditioning outdoor unit 70 mainly includes a compressor 73, a four-way switching valve 75, an outdoor heat exchanger 77, an expansion valve 79, and an accumulator 71. Furthermore, the air conditioning outdoor unit 70 also has an outdoor fan 78.

(1-1-1) Compressor 73, four-way switching valve 75, and accumulator 71
The compressor 73 variably adjusts the operating capacity by an inverter and sucks and compresses the gas refrigerant. An accumulator 71 is arranged in front of the suction port of the compressor 73 so that liquid refrigerant is not directly sucked into the compressor 73.

  The four-way switching valve 75 switches the direction of the refrigerant flow when switching between the cooling operation and the heating operation. During the cooling operation, the four-way switching valve 75 connects the discharge side of the compressor 73 and the gas side of the outdoor heat exchanger 77 and connects the suction side of the compressor 73 and the gas side of the indoor heat exchanger 13. . That is, this is the state indicated by the solid line in the four-way switching valve 75 in FIG.

  During the heating operation, the four-way switching valve 75 connects the discharge side of the compressor 73 and the gas side of the indoor heat exchanger 13 and connects the suction side of the compressor 73 and the gas side of the outdoor heat exchanger 77. Connecting. That is, this is the state indicated by the dotted line in the four-way selector valve 75 in FIG.

(1-1-2) Outdoor heat exchanger 77 and outdoor fan 78
The outdoor heat exchanger 77 can condense or evaporate the refrigerant flowing inside by heat exchange with outdoor air. An outdoor fan 78 is disposed so as to face the outdoor heat exchanger 77. By rotating, the outdoor fan 78 takes in outdoor air and blows it to the outdoor heat exchanger 77 to exchange heat between the refrigerant and the outdoor air. Facilitate.

(1-1-3) Expansion valve 79
The expansion valve 79 is connected to a pipe between the outdoor heat exchanger 77 and the indoor heat exchanger 13 in order to adjust the refrigerant pressure and the refrigerant flow rate, and allows the refrigerant to flow in both the cooling operation and the heating operation. Has the function of expanding.

(1-2) Air conditioning indoor unit 10
2 is a perspective view of the air conditioning indoor unit 10 of the air conditioner 1, and FIG. 3 is a cross-sectional view of the air conditioning indoor unit 10 in FIG. 1, 2, and 3, a main body casing 11, an indoor heat exchanger 13, an indoor fan 14, and a frame 17 are mounted on the air conditioning indoor unit 10.

(1-2-1) Main body casing 11
The main body casing 11 accommodates the indoor heat exchanger 13, the indoor fan 14, the frame 17, and the control unit 50 inside.

  An air outlet 15 is provided at the lower part of the main body casing 11. A rear flap 40 as a wind direction switching means for changing the direction of the blown air blown from the blower outlet 15 is rotatably attached to the blower outlet 15. The rear flap 40 is driven by a motor (not shown) and can change the direction of the blown air, and can also open and close the blowout port 15. The rear flap 40 can take a plurality of postures having different inclination angles.

  Further, a front flap 31 as a wind direction switching means is provided in the vicinity of the air outlet 15. The front flap 31 can take a posture inclined in the front-rear direction by a motor (not shown), and is provided on the inclined lower surface portion 11d between the lower end of the front panel 11b and the outlet 15 when the operation is stopped. It is accommodated in the accommodating part 130. The front flap 31 can take a plurality of postures having different inclination angles. A sub-front flap 32 as a wind direction switching means is rotatably arranged upstream of the front flap 31 in the flow of the blown air.

(1-2-2) Indoor heat exchanger 13 and indoor fan 14
The indoor heat exchanger 13 is a cross-fin heat exchanger, and can evaporate or condense the refrigerant flowing inside by heat exchange with indoor air, thereby cooling or heating indoor air. In addition, the indoor heat exchanger 13 has an inverted V-shape in which both ends are bent downward in a side view, and the indoor fan 14 is located below the indoor heat exchanger 13. The indoor fan 14 is a cross-flow fan, blows air taken in from the room against the indoor heat exchanger 13 and then blows it into the room. The indoor heat exchanger 13 and the indoor fan 14 are attached to the frame 17.

(1-3) Control unit 50
FIG. 4 is a control block diagram of the air conditioner 1. 1 and 4, the control unit 50 includes an indoor side control unit 50 a built in the air conditioning indoor unit 10 and an outdoor side control unit 50 b built in the air conditioning outdoor unit 70. Infrared signals are transmitted and received between the indoor control unit 50a and the remote controller 52. Signals are transmitted and received between the indoor side control unit 50a and the outdoor side control unit 50b via wires.

  The indoor side control unit 50 a drives the front flap drive motor 315, the sub-front flap drive motor 325, the rear flap drive motor 405, and the indoor fan 14 based on a command signal from the remote controller 52.

  The outdoor control unit 50b receives the command from the remote control 52 and based on the command signal from the indoor control unit 50a, the operating frequency of the compressor 73, the switching operation of the four-way switching valve 75, and the opening of the expansion valve 79. , And the rotation of the outdoor fan 78 is controlled.

(1-4) Remote control 52
A remote control unit (hereinafter referred to as a remote controller 52) controls the air conditioner by communicating with a control unit built in the air conditioner indoor unit 10 and the air conditioner outdoor unit 70 in accordance with a user operation.

  The remote controller 52 is provided with an operation switch 522, an operation changeover switch 524, a temperature setting switch 526, an on timer switch 528, an insensitive air current operation on / off switch 530, and a wind direction adjustment switch 532.

  The wind direction adjusting switch 532, the front flap 31, the sub front flap 32, the rear flap 40, the front flap drive motor 315, the sub front flap drive motor 325, and the rear flap drive motor 405 are collectively referred to as a wind direction switching unit.

  The operation switch 522 alternately switches between operation and stop of the air conditioner 1 every time it is operated. The operation changeover switch 524 switches the operation in the order of automatic → cooling → dehumidification / cooling → dehumidification → heating → humidification / heating each time it is operated. The temperature setting switch 526 increases in set temperature each time it is pressed upward, and decreases in temperature each time it is pressed down. Each time the on-time timer switch 528 is operated, the time is entered sequentially, such as 1 hour later, 2 hours later... 6 hours later.

  The insensitive airflow operation on / off switch 530 is operated when turning on the insensitive airflow operation, which is one of the start conditions of the insensitive airflow operation.

  Each time the wind direction adjustment switch 532 is operated, the front flap 31 and the rear flap 40 are alternately switched between vertical swing and fixed arbitrary position.

(2) Details of wind direction switching means (2-1) Vertical wind direction adjusting plate 20
The vertical air direction adjusting plate 20 has a plurality of blade pieces 201 arranged along the longitudinal direction of the air outlet 15 (direction perpendicular to the paper surface of FIG. 3). The vertical air direction adjusting plate 20 is disposed in the outlet channel 18 at a position closer to the indoor fan 14 than the rear flap 40. The plurality of blade pieces 201 swings left and right around a state perpendicular to the longitudinal direction by horizontally reciprocating along the longitudinal direction of the air outlet 15.

(2-2) Front flap 31
FIG. 5 is an enlarged cross-sectional view of the front flap 31 and the rear flap 40 in FIG. FIG. 6 is a cross-sectional view of the air conditioning indoor unit when operation is stopped. 5 and 6, the front flap 31 is accommodated in the accommodating portion 130 while the air conditioning operation is stopped.

  The front flap 31 is separated from the accommodating portion 130 by rotating. The rotation axis of the front flap 31 is set below the front rib 15a of the upper partition wall 161 of the blower outlet forming wall 16, and the rear end of the front flap 31 and the rotation shaft are connected at a predetermined interval. ing. Therefore, the height position of the rear end of the front flap 31 is rotated so that the front flap 31 is rotated away from the accommodating portion 130.

  The front flap 31 is moved counterclockwise when viewed from the front in FIG. 6, so that the front flap 31 moves away from the housing portion 130 while drawing a circular arc at both the front and rear ends of the front flap 31. Further, the front flap 31 rotates in the clockwise direction in the front view of FIG. 3, so that the front flap 31 approaches the housing portion 130 and is finally housed in the housing portion 130.

  The operating state of the front flap 31 includes the attitude accommodated in the accommodating part 130 (see FIG. 6), the attitude rotated and tilted forward and upward, further rotated and substantially horizontal, and further rotated and downwardly forward. And a posture (see FIGS. 3 and 5) that further rotates and tilts backward and downward.

  The front flap 31 has a first surface 31a that forms an outer surface and a second surface 31b that forms an inner surface when the front flap 31 is in the posture of being accommodated in the accommodating portion 130. The first surface 31a and the second surface 31b form a rear surface and a front surface, respectively, when the front flap 31 is tilted downward in the rearward direction in FIGS.

  As shown in FIG. 5, the first surface 31 a is provided with a recess 311 whose size is reduced in the thickness direction of the front flap 31. The recess 311 is located closer to the rotation axis when viewed from the center of the front flap 31.

(2-3) Sub-front flap 32
The sub-front flap 32 is a plate-like member that is located upstream of the front flap 31 in the flow of blown air. The sub-front flap 32 is smaller than the front flap 31, but the sub-front flap 32 is set to a size sufficient to guide the air that has passed through the blowout flow path 18 to the first surface 31 a of the front flap 31.

  The sub-front flap 32 is accommodated in an accommodating portion 16a provided in the upper partition wall 161 of the outlet forming wall 16 when not in use. The sub-front flap 32 has a first surface 32a that forms a lower surface and a second surface 32b that forms an upper surface when in the posture of being accommodated in the accommodating portion 16a. The first surface 32a and the second surface 32b form a rear surface and a front surface, respectively, when the sub-front flap 32 takes the posture shown in FIGS.

  The accommodating part 16a is formed by denting the upper partition 161 of the blower outlet forming wall 16 in the thickness direction. The depth of the accommodating portion 16a is set so that the first surface 32a of the sub-front flap 32 does not protrude toward the flow path side from the surface of the upper partition wall 161 when the sub-front flap 32 is accommodated.

  When the sub-front flap 32 is used, the sub-front flap 32 moves from the housing portion 16 a by rotation and protrudes toward the flow path side from the surface of the upper partition wall 161. The rotation axis of the sub-front flap 32 is set below the upstream end of the accommodating portion 16a.

  For example, when the front flap 31 is inclined rearward and downward as shown in FIG. 5, the sub front flap 32 rotates so that its front end enters the recess 311 of the front flap 31. At this time, since the blown air bypasses the gap between the upper partition wall 161 and the sub front flap 32 when the entire sub front flap 32 is separated from the housing portion 16a, the rear end of the sub front flap 32 is placed in the housing portion in order to prevent this. 16a remains and the expansion of the gap between the upper partition wall 161 and the sub-front flap 32 is suppressed.

  Thereafter, the first surface 32a of the sub-front flap 32 and the first surface 31a of the front flap 31 form an air flow guide surface 30a, and generate an air flow toward the lower portion of the side wall together with the rear flap 40.

(2-4) Rear flap 40
As shown in FIG. 6, the rear flap 40 has an area that can close the air outlet 15. The rear flap 40 has a first surface 40a that forms an outer surface and a second surface 40b that forms an inner surface when the air outlet 15 is closed. The first surface 32a and the second surface 32b form a rear surface and a front surface, respectively, when the rear flap 40 takes a posture in which the rear flap 40 is inclined rearward and downward in FIGS.

  The first surface 40a is finished to a gentle circular curved surface that is convex outwardly with emphasis on design. In contrast, the second surface 40b includes a flat surface 40ba and a curved surface 40bb, and is arranged in the order of the flat surface 40ba and the curved surface 40bb from the upper end to the lower end of the rear flap 40 as shown in FIG. Yes. In FIG. 5, the curved surface 40bb is a curved surface that swells to the front side with a radius of 200 mm or more.

  The rotation axis of the rear flap 40 is set at a position adjacent to the rear rib 15 b of the lower partition 162 of the blower outlet forming wall 16. When the rear flap 40 rotates about the rotation axis in the counterclockwise direction of FIG. 6 when viewed from the front, the rear flap 40 operates to move away from the front end of the air outlet 15 to open the air outlet 15. Conversely, when the rear flap 40 rotates about the rotation axis in the clockwise direction in FIG. 3, the rear flap 40 operates so as to approach the front end of the air outlet 15 to close the air outlet 15.

  In a state where the rear flap 40 opens the blower outlet 15, the blown air blown from the blower outlet 15 flows along the second surface 40 b of the rear flap 40 substantially.

(3) Direction control of blown air The air-conditioning indoor unit of this embodiment changes the attitude | position of the front flap 31, the sub front flap 32, and the rear flap 40 for every wind direction mode as a means to control the direction of blown air, and blows off air The direction is adjusted. Hereinafter, each wind direction mode will be described with reference to the drawings. Each wind direction mode can be controlled to be automatically changed, or can be selected by a user via a remote controller or the like.

(3-1) Rear Downward Airflow Mode The rearward downward airflow mode is a mode in which the blown air is directed toward the lower part of the side wall where the air conditioning indoor unit 10 is installed. In the rear downward airflow mode, the blown air flows from the lower part of the side wall to the floor surface and flows toward the opposite side wall along the floor surface.

  In the rear downward airflow mode, the front flap 31, the sub-front flap 32, and the rear flap 40 take the postures shown in FIGS. In FIG. 5, the sub front flap 32 is inclined at an angle α (0 to 10 °) with respect to the vertical plane with its lower end positioned in front of the upper end.

  Further, the front flap 31 is inclined at an angle β (0 to 20 °) with respect to the vertical plane with its lower end positioned on the side of the side wall from the upper end. Thereby, the convex airflow guide surface 30a in which the first surface 32a of the sub front flap 32 and the first surface 31a of the front flap 31 bulge forward is formed.

  The lower end of the front flap 31 at this time is positioned below the height position of the tip of [the rear rib 15b protruding vertically downward from the rear end position of the blowout port 15]. The front end of the rear rib 15 b is the lowermost end of the air outlet 15.

  On the other hand, the rear flap 40 has its lower end positioned closer to the side wall than the upper end, and the second surface 40b is inclined with respect to the vertical plane. Specifically, as shown in FIG. 3, the rear flap 40 is inclined until the first surface 40 a of the rear flap 40 contacts or approaches the tip of the rear rib 15 b.

  In the present embodiment, since the gap between the rear flap 40 and the rear rib 15b is equal to or less than a predetermined value (5 mm), the ventilation resistance when air flows through the gap is increased, and the blown air passes through the gap. The airflow guide space 30a and the second surface 40b, which is a wider passage, are avoided and flow into the air passage space.

  Accordingly, the blown air passes through the air passage space sandwiched between the airflow guide surface 30a and the second surface 40b. In that case, the blowing air guided to the sub front flap 32 follows the front flap 31 larger than that. Since the front flap 31 is inclined with respect to the vertical plane with the lower end of the front flap 31 positioned on the side of the side of the upper end, the blown air can be guided to the lower side of the side wall downward by 90 ° or more from the horizontal.

  Further, until the blown air passing through the air passage space sandwiched between the airflow guide surface 30a and the second surface 40b reaches below the height position of the tip of the rear rib 15b (the lowermost end of the blowout port 15), The vehicle advances along the air passage space in a state where forward diffusion is prevented by the front flap 31. Since the blown air becomes an air flow along the second surface 40b of the rear flap 40 when leaving the air passage space, the air flow toward the lower portion of the side wall is sufficiently generated.

  Further, the blown air flows in the order of the flat surface 40ba and the curved surface 40bb of the second surface 40b of the rear flap 40. Since the curved surface 40bb is set to have a radius of 200 mm or more so that the Coanda effect can be easily exerted, the blown air is drawn downward to the curved surface 40bb by the Coanda effect after becoming a downward air flow along the plane 40ba, and the lower portion of the side wall. The airflow toward

  As described above, when the front flap group 30 and the rear flap 40 by the front flap 31 and the sub front flap 32 interact with each other, a backward downward airflow toward the lower portion of the side wall is easily generated.

(3-2) Front Downward Airflow Mode In the forward downward airflow mode, either the mode using the sub-front flap 32 or the mode not using is selected automatically or by the user.

(3-2-1) Mode Using Sub-Front Flap 32 FIG. 7 is a cross-sectional view of the air conditioning indoor unit 10 in the forward downward airflow mode using the sub-front flap 32. 8 is an enlarged cross-sectional view of the front flap 31, the sub front flap 32, and the rear flap 40 in FIG.

  7 and 8, first, the front flap 31 is rotated so that the first surface 31a of the front flap 31 is inclined downward by a predetermined angle x1 from the horizontal. If the first surface 31a is a circular arc surface and it is difficult to determine the angle, a line connecting both ends of the first surface 31a may be used as the angle reference, as shown in FIG.

  Further, the sub-front flap 32 also rotates, and the first surface 32a of the sub-front flap 32 is inclined downward by a predetermined angle y1 from the horizontal. At this time, since the blown air bypasses the gap between the upper partition wall 161 and the sub front flap 32 when the entire sub front flap 32 is separated from the housing portion 16a, the rear end of the sub front flap 32 is placed in the housing portion in order to prevent this. 16a remains and the expansion of the gap between the upper partition wall 161 and the sub-front flap 32 is suppressed.

  Further, the rear flap 40 is also rotated so that the flat surface 40ba of the second surface 40b of the rear flap 40 is inclined downward by a predetermined angle z1 from the horizontal.

  As shown in FIG. 8, when the front flap 31 and the sub front flap 32 are viewed from the front in the horizontal direction, the front end portion of the sub front flap 32 is upstream of the front flap 31 and the front flap 31. It overlaps the rear end of the front flap 31 by a dimension L vertically below the rear end surface.

  The positional relationship between the front flap 31, the sub front flap 32, and the gap between them is a relationship in which the sub front flap 32, the gap, and the front flap 31 are arranged in this order, as viewed from the upstream side of the flow of the blown air. Since it is hidden by the upstream sub-front flap 32, the air guided to the first surface 32 a of the sub-front flap 32 through the blow-out flow path 18 is vigorous and does not rotate around the gap, but the first surface of the front flap 31. It flows to 31a. As a result, even if there is the gap, the conditioned air is prevented from bypassing the gap.

  As described above, in the forward downward airflow mode using the sub-front flap 32, the sub-front flap 32 takes a posture of blocking the airflow passing through the gap between the upper partition wall 161 and the front flap 31, and the upper end of the front flap 31 is the boundary. Since blowing air is prevented from flowing along both surfaces of the front flap 31, the upper end of the front flap 31 does not become ventilation resistance. As a result, an increase in power consumption of the indoor fan 14 and a decrease in energy saving performance are prevented.

  Further, the forward downward airflow mode using the sub-front flap 32 is particularly useful when generating forward downward blowing air in the cooling operation. This is because the cooled air does not flow to the second surface 31b side of the front flap 31 and thus has an effect of preventing condensation.

  In the present embodiment, the sub-front flap 32 is used in the cooling operation except when an upward airflow is generated.

(3-2-2) Mode without Using the Sub-Front Flap 32 FIG. 9 is a cross-sectional view of the air conditioning indoor unit 10 in the forward downward airflow mode without using the sub-front flap 32. In FIG. 9, the sub-front flap 32 is accommodated in the accommodating portion 16 a, and the first surface 32 a of the sub-front flap 32 is along the extended surface of the adjacent upper partition 161, and the air along the upper partition 161 Does not obstruct the flow.

  In the forward downward airflow mode in which the sub-front flap 32 is not used, the sub-front flap 32 itself does not have ventilation resistance. However, since the sub-front flap 32 cannot prevent the airflow passing through the gap between the upper partition wall 161 and the front flap 31, it cannot be denied that the upper end of the front flap 31 becomes a ventilation resistance.

(3-3) Forward airflow mode In the forward airflow mode, a circulation airflow mode that sends out the blown air forward vigorously and an intermediate airflow mode that sends out the blown air thickly forward are selected automatically or by the user.

(3-3-1) Circulation Airflow Mode FIG. 10 is a partial cross-sectional view of the air conditioning indoor unit 10 in the circulation airflow mode. In FIG. 10, the front flap 31 is in a horizontal posture or a posture in which the front end is directed horizontally forward. The sub-front flap 32 is accommodated in the accommodating portion 16a. The rear flap 40 has an inclined posture in which the flat surface 40ba of the second surface 40b is along the extension of the tangent at the end of the lower partition 162 of the blower outlet forming wall 16. Since the lower partition 162 is also inclined along the extension of the tangent at the terminal end of the lower scroll 172, the lower scroll 172, the lower partition 162, and the plane 40ba are arranged so as to form one scroll wall. Is guided to the second surface 40b of the rear flap 40 without being interrupted.

  In the circulation airflow mode, since the distance between the first surface 31a of the front flap 31 and the second surface 40b of the rear flap 40 is narrow, the blown air is squeezed to increase the flow velocity, and the air is sent forward. Stir the air in the space. As a result, air stagnation in the air-conditioning target space can be eliminated.

(3-3-2) Intermediate Airflow Mode FIG. 11 is a partial cross-sectional view of the air conditioning indoor unit 10 in the intermediate airflow mode. In FIG. 11, the front flap 31 takes a posture in which the front end is directed above the horizontal. The sub-front flap 32 is accommodated in the accommodating portion 16a. The rear flap 40 has a posture in which the flat surface 40ba of the second surface 40b is inclined forward and downward.

  At first glance, it seems that the blown air flows forward and downward along the plane 40ba of the rear flap 40. However, the blown air that has exited the blowout port 15 is attracted to the first surface 31a of the front flap 31 by the Coanda effect and becomes horizontal and It is sent out as a slightly upward airflow from the horizontal.

  Here, the Coanda effect is a phenomenon in which if there is a wall near the flow of gas or liquid, it will flow in the direction along the wall even if the direction of the flow is different from the direction of the wall (Asakura). Bookstore "Dictionary of the Law").

  In FIG. 11, in order to cause the Coanda effect on the first surface 31 a of the front flap 31, the front flap 31 and the rear flap 40 need to be equal to or less than a predetermined opening angle. Since the positional relationship between the two is disclosed in a patent document (Japanese Patent Laid-Open No. 2013-76530) filed on September 30, 2011 by the applicant, description thereof is omitted here.

(4) Insensitive airflow operation In the air conditioner 1, in the heating operation at low load, the room temperature is maintained by the airflow that blows the blown air along the floor surface from the wall where the air conditioning indoor unit 10 is installed. Air-sensitive operation is performed.

  If only the direction of the airflow is compared, it is the same as the backward downward airflow mode described in (3-1), but in order to perform the insensitive airflow operation, the preliminary operation is performed prior to that.

(4-1) Preliminary operation The preliminary operation is an operation for increasing the room temperature and storing the heat in the floor at the time of high load before entering the insensitive airflow operation. By this preliminary operation, the time for the subsequent insensitive airflow operation can be maintained long.

  12A is an explanatory diagram showing the first airflow mode executed in the preliminary operation, FIG. 12B is an explanatory diagram showing the second airflow mode executed in the preliminary operation, and FIG. 12C is the first airflow mode executed in the preliminary operation. It is explanatory drawing showing 3 airflow modes.

  First, in FIG. 12A, the temperature-controlled air from the air conditioning indoor unit 10 is blown out toward the center of the room 200. The airflow direction at this time is the same as the forward airflow mode described in (3-3), but the forward airflow mode in the preliminary operation is hereinafter referred to as a first airflow mode. The entire room 200 is warmed by the first airflow mode.

  Next, in FIG. 12B, the temperature-controlled air is blown out from the air conditioning indoor unit 10 toward the center of the floor 220. The airflow that reaches the center of the floor flows to the back side along the floor surface. Here, the back means a lower part of the wall 230 facing the side wall 210 on which the air conditioning indoor unit 10 is installed.

  The airflow direction at this time is the same as the forward downward airflow mode described in (3-2), but the forward downward airflow mode in the preliminary operation is hereinafter referred to as a second airflow mode. Since the back side is warmed from the center of the floor surface by the second air flow mode (the oval portion in FIG. 12B), when the temperature of the floor 220 is still low, the warm air flows and rises on the floor surface, causing discomfort to the residents. This situation is avoided.

  In FIG. 12C, the temperature-controlled air is blown out from the air conditioning indoor unit 10 toward the lower portion of the side wall 210. When the airflow flows along the floor surface from the side wall, the front side of the floor 220 is warmed. Here, the near side refers to an area immediately below the air conditioning indoor unit 10.

  The airflow direction at this time is the same as the backward downward airflow mode described in (3-1), but the backward downward airflow mode in the preliminary operation is hereinafter referred to as a third airflow mode. Since the front side of the floor 220 is warmed by the third airflow mode (the oval part in FIG. 12C), the warm air blown directly down from the air conditioning indoor unit 10 rises when the front side is not warmed, and the air conditioning indoor unit 10 is turned off. Invite situations are avoided.

  In the preliminary operation, the control unit 50 starts the insensitive airflow operation after sequentially executing the first airflow mode, the second airflow mode, and the third airflow mode.

(4-2) Operation of Insensitive Airflow Operation FIG. 12D is an explanatory diagram illustrating a wall airflow mode executed in the insensitive airflow operation. In FIG. 12D, in the wall airflow mode of the insensitive airflow operation, the airflow direction is visually the same as the third airflow mode (rearward-downward airflow mode) or further toward the side wall 210.

  The critical difference between the wall airflow mode and the third airflow mode is that the control unit 50 determines the temperature of the blown air when the wall airflow mode is executed by the blown air temperature suppression control in the first airflow mode, the second airflow mode, and It is the point made lower than at the time of any execution of 3 airflow mode.

  That is, the control unit 50 warms the entire air-conditioned space in the first airflow mode to a room temperature that satisfies the user, and then warms the back side from the center of the floor in the second airflow mode to shift to the wall airflow mode. Suppresses air currents. In addition, the air flow when the front side of the floor is warmed in the third airflow mode and the wall airflow mode is shifted is suppressed, and unnecessary thermo-off is prevented.

  When the control unit 50 executes the first airflow mode, the second airflow mode, and the third airflow mode, the room 200 is sufficiently warmed and stored in the floor 220, so that the air conditioner 1 is in a low load state. . Therefore, even if the temperature of the airflow flowing along the floor surface from the wall surface in the wall airflow mode is lowered by the blown air temperature suppression control, the room temperature is maintained long. In addition, the wall airflow is an airflow that crawls along the floor surface from the wall surface and does not hit the occupant, so there is an advantage that it is difficult for the resident to feel uncomfortable even if the temperature drops, and hence it is also called the insensitive airflow .

(4-2-1) Flow from Preliminary Operation to Start of Insensitive Airflow Operation Hereinafter, operations from the preliminary operation to the insensitive airflow operation will be described with reference to a flowchart.

  FIG. 13A is a control flowchart from the preliminary operation to the start of the insensitive airflow operation, and FIG. 13B is a control flowchart from the start to the end of the insensitive airflow operation.

(Step S1)
First, in FIG. 13A, the control unit 50 determines whether or not the condition for starting the insensitive airflow operation is satisfied in step S1, and if satisfied, the process proceeds to step S2, and if not satisfied, the determination is made. continue. The start conditions for the insensitive airflow operation are as follows.

  As a first condition, the insensitive airflow operation needs to be turned on. “The insensitive airflow operation is turned on” means that the insensitive airflow operation on / off switch 530 on the remote controller 52 is turned on.

  As a second condition, the outside air temperature Tout needs to be equal to or higher than a predetermined permission temperature Tper. The reason is that if the outside air temperature is too low, the insensitive airflow operation cannot be maintained.

  As a third condition, the actual operation mode needs to be the heating operation. Further, as a fourth condition, the wind direction setting needs to be automatic.

  When all of the first condition to the fourth condition are satisfied, the control unit 50 determines that the start condition for the insensitive airflow operation is satisfied, and proceeds to step S2, where the first condition to the fourth condition are satisfied. If even one of them is missing, the determination is continued until the start condition for the insensitive airflow operation is satisfied.

(Step S2)
Next, in step S2, the control unit 50 starts execution of the first airflow mode of the preliminary operation, and proceeds to step S3.

(Step S3)
Next, in step S3, the controller 50 determines whether or not the absolute value | Tr−Ts | of the temperature difference between the room temperature Tr and the set temperature Ts is equal to or smaller than the first threshold value ΔT1, and | Tr−Ts When | ≦ ΔT1, the process proceeds to step S4, and when | Tr−Ts | ≦ ΔT1, the process returns to step S2.

(Step S4)
Next, in step S4, the control unit 50 starts execution of the second airflow mode of the preliminary operation, and proceeds to step S5.

(Step S5)
Next, in step S5, the controller 50 determines whether or not the absolute value | Tr−Ts | of the temperature difference between the room temperature Tr and the set temperature Ts is equal to or less than the second threshold value ΔT2, and | Tr−Ts When | ≦ ΔT2, the process proceeds to step S6A, and when | Tr−Ts | ≦ ΔT2, the process proceeds to step S6B.

(Step S6A)
When the control unit 50 proceeds to step S6A, it starts a timer to start counting elapsed time, and proceeds to step S7.

(Step S6B)
When the control unit 50 proceeds to step S6B, the control unit 50 determines whether or not the absolute value | Tr−Ts | of the temperature difference between the room temperature Tr and the set temperature Ts exceeds the return threshold value ΔTback. The return threshold value ΔTback is a threshold value for determining whether or not to restart from the first air flow mode because the temperature difference between the room temperature Tr and the set temperature Ts has increased.

  When it is determined that | Tr−Ts |> ΔTback, the control unit 50 returns to step S2, and when it is determined that | Tr−Ts |> ΔTback is not satisfied, the control unit 50 proceeds to step S4.

(Step S7)
Next, in step S7, the control unit 50 starts execution of the third airflow mode of the preliminary operation, and proceeds to step S8.

(Step S8)
Next, in step S8, the control unit 50 determines whether or not the elapsed time t after starting the timer has exceeded a predetermined time tw. When t ≧ tw, the control unit 50 proceeds to step S9 and does not satisfy t ≧ tw. If so, the process returns to step S7.

(4-2-2) Operation from Start to End of Insensitive Airflow Operation (Step S9)
In FIG. 13B, the control unit 50 executes the wall airflow mode in step S9. The temperature control in the wall airflow mode is switched to control based on the temperature of the indoor heat exchanger 13 instead of control based on | Tr-Ts | as in the first airflow mode, the second airflow mode, and the third airflow mode. .

  In the wall airflow mode, since the blown air temperature is suppressed more than in the first airflow mode, the second airflow mode, and the third airflow mode, the target temperature of the indoor heat exchanger 13 through which the blown air passes is controlled. Thus, the followability of the blown air temperature with respect to the target temperature is improved.

(Explanation of blown air temperature suppression control)
The upper limit temperature Tct of the indoor heat exchanger 13 is calculated from the equation “Tct = α (Ts−Tr) + Ts + β” using the set temperature Ts and the indoor temperature Tr as parameters.

  The controller 50 controls the drooping of the compressor 73 when the deviation between the temperature Tc of the indoor heat exchanger 13 and the upper limit temperature Tct is within γ1. In addition, when the deviation between the temperature Tc of the indoor heat exchanger 13 and the upper limit temperature Tct exceeds γ2, the control unit 50 increases the operating frequency of the compressor 73 (γ1 <γ2).

  For example, when Tc rises, the result is within the range of Tct−γ2 ≦ Tc ≦ Tct−γ1, and the drooping control of the compressor 73 is performed within the range of Tct−γ1 ≦ Tc ≦ Tct.

  Further, the control unit 50 performs the drooping control of the compressor 73 within the range of Tct−γ1 ≦ Tc ≦ Tct when Tc is lowered, and assumes that the result is within the range of Tct−γ2 ≦ Tc ≦ Tct−γ1, and Tc <Tct In the range of -γ2, the operating frequency of the compressor 73 is increased.

  Control that keeps the blown air temperature lower than in the first airflow mode, the second airflow mode, and the third airflow mode while controlling the upper limit temperature of the indoor heat exchanger temperature Tc in this way is called blown air temperature suppression control.

(Step S10)
Next, in step S10, the control unit 50 determines whether or not a condition for returning to any one of the first airflow mode, the second airflow mode, and the third airflow mode in the preliminary operation is satisfied, and Returns to each mode, and if not established, proceeds to step S11. The return conditions are as follows.

  The condition A is that the absolute value | Tr−Ts | of the temperature difference between the room temperature Tr and the set temperature Ts exceeds the first return threshold ΔTback1.

  Condition B is that the effective bed average temperature Tyuka is less than [set temperature Ts−constant c].

  The condition C is that neither the condition A nor the condition B is satisfied when returning from the thermo-off.

  The controller 50 returns to step S2 when determining that the condition A is satisfied, returns to step S4 when determining that the condition B is satisfied, and returns to step S6 when determining that the condition C is satisfied. Return to.

(Step S11)
Next, in step S11, the control unit 50 determines whether or not a condition for terminating the insensitive airflow operation is satisfied. If the condition is satisfied, the control unit 50 ends. If not, the process returns to step S9. The termination conditions for the insensitive airflow operation are as follows.

  As the first end condition, the insensitive airflow operation needs to be turned off. “The insensitive airflow operation is turned off” means that the insensitive airflow operation on / off switch 530 on the remote controller 52 is turned off.

  As a second end condition, the outside air temperature Tout needs to be lower than the predetermined permission temperature Tper. The reason is that if the outside air temperature is too low, the insensitive airflow operation cannot be maintained.

  As the third end condition, it is necessary that the actual operation mode is not the heating operation. Furthermore, as the fourth end condition, the wind direction setting needs to be not automatic.

  When all of the first to fourth end conditions are satisfied, the control unit 50 determines that the end condition for the insensitive airflow operation is satisfied, and ends the insensitive airflow operation.

  Depending on the load, there is a possibility that the wall airflow mode must be stopped immediately after the wall airflow mode shifts, because the supply capacity is insufficient. When such a situation occurs, it is possible to avoid the occurrence of the situation by delaying the transition (for example, step S3 and / or step S5) by tightening the transition condition to the next wall airflow mode. it can.

  The above is the insensitive airflow operation, and the energy-saving operation can be performed while maintaining the room temperature for a long time without applying blown air to the occupant at low load.

(5) Features (5-1)
In the air conditioning indoor unit 10, the temperature of the airflow flowing along the floor surface from the wall surface in the wall airflow mode is lowered by lowering the temperature of the blown air, so even if the floor surface is not sufficiently warmed, The rise of the airflow flowing along the surface can be suppressed as compared with the conventional case. In addition, since the wall airflow is an airflow that crawls along the floor surface from the wall surface and does not hit the resident, it is difficult for the resident to feel uncomfortable even if the temperature falls.

(5-2)
In the blown air temperature suppression control, the followability of the blown air temperature with respect to the target temperature is improved by controlling the target temperature (upper limit temperature Tct) of the indoor heat exchanger 13 through which the blown air passes.

(5-3)
In the preliminary operation, first, the entire air-conditioning target space is warmed in the first airflow mode to a room temperature that satisfies the user. Next, in order to suppress the airflow soaring when shifting to the wall airflow mode due to the low floor temperature, the back side is warmed from the center of the floor in the second airflow mode. Furthermore, in order to prevent the thermo-off due to the airflow rising just below the inner machine due to the low temperature in front of the floor, the front of the floor is warmed in the third airflow mode. As a result, even when the mode is changed to the wall airflow mode, the airflow is further suppressed from being suppressed, and unnecessary thermo-off is prevented.

(5-4)
In the air conditioning indoor unit 10, since the first air flow mode is sequentially shifted to the third air flow mode based on the temperature difference between the set temperature Ts and the room temperature Tr, the room temperature becomes a comfortable temperature, and the temperature directly below the air conditioning indoor unit 10. Since the third airflow mode is shifted to the wall airflow mode after the floor surface is also warmed, the airflow is further suppressed.

(6) Modification In the above embodiment, the transition determination from the first airflow mode to the second airflow mode and the transition determination from the second airflow mode to the third airflow mode are performed between the room temperature Tr and the set temperature Ts. Although it is based on the absolute value of the difference, it is not limited to this.

  FIG. 14 is a control flowchart from the preliminary operation to the start of the insensitive airflow operation in the first modified example. In FIG. 14, step S3 ′ and step S5 ′ are modifications of step S3 and step S5 in FIG. 13A, and the others are as described in FIGS. 13A and 13B. Will be described.

(Step S3 ')
In step S3 ′, the controller 50 determines whether or not the absolute value | Tr−Ts | of the temperature difference between the room temperature Tr and the set temperature Ts is equal to or less than the first threshold value ΔT1, and the effective floor average temperature is further determined. It is determined whether or not the temperature is equal to or higher than [set temperature Ts−Tyuka1]. When “| Tr−Ts | ≦ ΔT1 and the effective floor average temperature ≧ [set temperature Ts−Tyuka1]”, the process proceeds to step S4, and “| Tr−Ts | ≦ ΔT1 and the effective floor. If the average temperature ≧ [set temperature Ts−Tyuka1] is not satisfied, the process returns to step S2.

(Step S5 ')
In step S5 ′, the controller 50 determines whether or not the absolute value | Tr−Ts | of the temperature difference between the room temperature Tr and the set temperature Ts is equal to or less than the second threshold value ΔT2, and the effective floor average temperature is further determined. It is determined whether or not it is equal to or higher than [set temperature Ts−Tyuka2]. When “| Tr−Ts | ≦ ΔT2 and the effective floor average temperature ≧ [set temperature Ts−Tyuka2]”, the process proceeds to step S6A, where “| Tr−Ts | ≦ ΔT2 and the effective floor. When the average temperature ≧ [set temperature Ts−Tyuka2] is not satisfied, the process proceeds to step S6B.

  As described above, by changing step S3 and step S5 in FIG. 13A to step S3 ′ and step S5 ′, the transition condition becomes stricter, and as a result, the time for maintaining the wall airflow mode can be lengthened.

(7) Supplement Here, the transition from the first airflow mode to the wall airflow mode will be supplementarily described with reference to block diagrams and graphs.

  FIG. 15 is a block diagram showing conditions for shifting from the first airflow mode to the wall airflow mode. As shown in FIG. 15, the transition is repeated between the first airflow mode and the second airflow mode depending on the rise and fall of the room temperature and the floor temperature. There is a transition to the second airflow mode and the third airflow mode, but not the other way around.

  In the wall airflow mode, when the room temperature decreases, the mode changes to the first airflow mode, and when the floor temperature decreases, the mode changes to the second airflow mode.

  When the wall airflow mode is continued when returning from the thermo-off, the mode is shifted to the third airflow mode.

  FIG. 16 is a graph showing the transition from the first airflow mode to the wall airflow mode and the changes in the room temperature and the effective floor average temperature. In FIG. 16, the room temperature and the effective floor average temperature rise with a substantially constant gradient from the first air flow mode to the third air flow mode, and the indoor temperature and the effective floor average temperature are maintained constant after shifting to the wall air flow mode. I understand that.

  That is, the insensitive airflow operation exhibits an energy saving effect by performing airflow control in which the room and the floor are warmed by a three-stage airflow mode and thereafter the airflow control is performed from the wall along the floor surface by the wall airflow mode.

DESCRIPTION OF SYMBOLS 10 Air conditioning indoor unit 13 Indoor heat exchanger 15 Air outlet 30 Wind direction switching means 40 Wind direction switching means 50 Control part

Japanese Patent Laid-Open No. 6-109312

Claims (7)

A wall-mounted air conditioning indoor unit installed on the side wall of the air-conditioning target space and having a function of changing the air direction of the blown air blown out from the air outlet (15),
Wind direction switching means (30, 40) for changing the wind direction of the blown air;
A control unit (50) for executing a plurality of airflow modes through the airflow direction switching means (30, 40) to make the airflow corresponding to each of a plurality of airflow directions set in advance;
With
The plurality of airflow modes include a wall airflow mode that converts the blown air into an airflow that flows along the side walls and the floor of the air-conditioning target space during heating operation.
The control unit (50) performs blown air temperature suppression control that lowers the temperature of the blown air during the wall airflow mode execution than when performing the other airflow mode during heating operation.
Air conditioning indoor unit (10). It further includes an indoor heat exchanger (13) that functions as a condenser during heating operation,
The control unit (50) lowers the temperature target value of the indoor heat exchanger (13) in the blown air temperature suppression control.
The air conditioning indoor unit (10) according to claim 1. The plurality of airflow modes are:
A first air flow mode for turning the blown air forward and downward;
A second airflow mode in which the blown air is made to be an airflow directed downward toward the floor surface of the air-conditioning target space from below the first airflow mode;
Including
The controller (50) executes the wall airflow mode after sequentially executing the first airflow mode and the second airflow mode.
The air conditioning indoor unit (10) according to claim 1 or 2. The plurality of airflow modes further includes a third airflow mode that turns the blown air toward the lower portion of the side wall,
The controller (50) executes the wall airflow mode after sequentially executing the first airflow mode, the second airflow mode, and the third airflow mode.
The air conditioning indoor unit (10) according to claim 3. The controller (50) obtains a temperature difference between an indoor temperature that is a temperature of the air-conditioning target space and a set temperature that is a target value of the indoor temperature,
Furthermore, the control unit (50)
When the absolute value of the temperature difference becomes equal to or less than the first threshold during execution of the first airflow mode, the airflow mode is shifted from the first airflow mode to the second airflow mode,
When the absolute value of the temperature difference becomes equal to or less than a second threshold during execution of the second airflow mode, the airflow mode is shifted from the second airflow mode to the third airflow mode.
The air conditioning indoor unit (10) according to claim 4. The controller (50) transitions the airflow mode from the third airflow mode to the wall airflow mode after a first predetermined time has elapsed since the transition to the third airflow mode.
The air conditioning indoor unit (10) according to claim 4. When the absolute value of the temperature difference exceeds the third threshold before the continuation time of the wall airflow mode passes the second predetermined time after the transition to the wall airflow mode, the control unit (50) Delaying the transition to the wall airflow mode,
The air conditioning indoor unit (10) according to claim 5.

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