JP5803869B2 - Air conditioning indoor unit - Google Patents

Description

  The present invention relates to an air-conditioning indoor unit, and more particularly, to an air-conditioning indoor unit having a wind direction adjusting function for adjusting the wind direction of conditioned air blown out from an air outlet.

  In the wall-mounted air conditioning indoor unit, when the conditioned air is desired to reach farther, the wind direction of the conditioned air blown from the outlet is guided to the ceiling using the wind direction adjusting function. For example, in an air-conditioning indoor unit disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2002-61938), an anti-peeling means is provided at the upper edge of the air outlet. In this air conditioning indoor unit, the conditioned air blown out from the air outlet proceeds along the front inclined portion without being separated from the front inclined portion by the separation preventing means, and is guided to the ceiling.

  However, in the air conditioner as described above, a suction port is provided in the vicinity of the upper end portion of the front inclined portion, so that a phenomenon in which conditioned air toward the ceiling is directly sucked into the suction port, a so-called short circuit may occur. There is sex. If a short circuit occurs, the conditioned air is sucked into the suction port without circulating through the room, so that the room is not air-conditioned.

  An object of the present invention is to provide an air conditioning indoor unit capable of guiding conditioned air to a ceiling while suppressing the occurrence of a short circuit.

An air-conditioning indoor unit according to a first aspect of the present invention is a wall-hanging air-conditioning indoor unit having a function of adjusting the direction of conditioned air blown from an outlet, and includes a main body casing and Coanda blades. . The main body casing has an air outlet and a suction port located above the air outlet. The Coanda blade is provided in the vicinity of the air outlet, and guides the conditioned air into a predetermined direction as a Coanda airflow along its lower surface by the Coanda effect. The rear end portion of the Coanda blade is located in front of the air outlet and in the vicinity of the upper end of the air outlet. Moreover, the 1st taper-shaped part which guides the conditioned air which exits from a blower outlet to a lower surface is provided in the rear-end part of the Coanda blade | wing.

  In this air conditioning indoor unit, since the taper is formed at the rear end portion of the Coanda blade that receives the conditioned air blown out from the air outlet, the conditioned air is more easily guided to the lower surface than the state where the taper is not formed. Therefore, it is possible to suppress a short circuit flow that is directed toward the suction port along the front surface of the main body casing without facing to the main body casing.

  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 is provided with a second tapered portion at the front end of the Coanda blade. The taper length of the second tapered portion is smaller than that of the first tapered portion.

  In this air conditioning indoor unit, the airflow along the lower surface of the Coanda blade is separated at the front end of the Coanda blade, but by reducing the taper length of the front end portion, the generation of turbulent flow on the downstream side of the front end is suppressed, while Peeling can be induced.

  The air conditioner indoor unit according to the third aspect of the present invention is the air conditioner indoor unit according to the first aspect, and is provided with a separation inducing portion that facilitates separation of the conditioned air from the lower surface at the front end of the Coanda blade.

  In this air conditioning indoor unit, the airflow along the lower surface of the Coanda blade is separated at the front end of the Coanda blade, but by providing a separation inducing portion at the front end, the generation of turbulent flow on the downstream side of the front end is suppressed, while Peeling can be induced.

  In the air conditioning indoor unit according to the first aspect of the present invention, since the taper is formed at the rear end portion of the Coanda blade that greets the conditioned air blown out from the outlet, the conditioned air is more conditioned than the state where the taper is not formed. It becomes easy to guide to the lower surface, and it is possible to suppress a short circuit flow that is directed to the suction port along the front surface of the main body casing without facing the lower surface.

  In the air conditioning indoor unit according to the second aspect or the third aspect of the present invention, it is possible to induce separation from the lower surface while suppressing generation of turbulent flow on the downstream side of the front end of the Coanda blade.

A sectional view of an air-conditioning indoor unit at the time of operation concerning one embodiment of the present invention. Sectional drawing of the air-conditioning indoor unit in FIG. The side view of the wind direction adjustment blade | wing at the time of normal front blowing, and a Coanda blade | wing. The side view of the wind direction adjustment blade | wing at the time of normal front lower blowing, and a Coanda blade | wing. The side view of the wind direction adjustment blade | wing at the time of Coanda airflow front blowing, and the Coanda blade | wing. The side view of the wind direction adjustment blade | wing at the time of Coanda airflow ceiling blowing, and a Coanda blade | wing. Sectional drawing of the upper wall of a blower outlet. Sectional drawing of the Coanda blade | wing which takes an upward attitude | position. Sectional drawing of the Coanda blade | wing of the upper wall of a blower outlet, and an upward attitude | position.

  Hereinafter, embodiments of the present invention will be described 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 Conditioning Indoor Unit 10 FIG. 1 is a perspective view of the air conditioning indoor unit 10 during operation according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of the air conditioning indoor unit 10 in FIG. 1 and 2, the air conditioning indoor unit 10 is a wall-hanging type, and a main body casing 11, an indoor heat exchanger 13, an indoor fan 14, a bottom frame 16, and a control unit 40 are mounted thereon.

  The main body casing 11 has a top surface portion 11a, a front panel 11b, a back plate 11c, and a lower horizontal plate 11d, and houses an indoor heat exchanger 13, an indoor fan 14, a bottom frame 16, a filter 24, and a control unit 40 therein. doing.

  The top surface part 11a is located in the upper part of the main body casing 11, and the inlet 12 is provided in the front part of the top surface part 11a.

  The front panel 11b constitutes the front part of the air conditioning indoor unit 10, and has a curved shape with no suction opening. Further, the upper end of the front panel 11b is rotatably supported by the top surface portion 11a, and can operate in a hinged manner.

  A filter 24 is disposed between the suction port 12 and the indoor heat exchanger 13. The filter 24 removes dust contained in the air sucked from the suction port 12. The filter 24 is housed in the main body casing 11 in a state of being incorporated in the filter automatic cleaning unit 25.

  The indoor heat exchanger 13 and the indoor fan 14 are attached to the bottom frame 16. The indoor heat exchanger 13 exchanges heat with the passing 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.

  An air outlet 15 is provided at the lower part of the main body casing 11. A wind direction adjusting blade 31 that changes the direction of conditioned air blown from the blower outlet 15 is rotatably attached to the blower outlet 15. The wind direction adjusting blade 31 is driven by a motor (not shown) and can change the blowing direction of the conditioned air, and can also open and close the blowout port 15. The wind direction adjusting blade 31 can take a plurality of postures having different inclination angles.

  A Coanda blade 32 is provided in the vicinity of the air outlet 15. The Coanda blade 32 can take a posture inclined in the front-rear direction by a motor (not shown), and is accommodated in the accommodating portion 130 provided in the front panel 11b when the operation is stopped. The Coanda blade 32 can take a plurality of postures having different inclination angles.

  Further, the air outlet 15 is connected to the inside of the main body casing 11 by the air outlet channel 18. The blowout channel 18 is formed along the scroll 17 of the bottom frame 16 from the blowout port 15.

  The indoor air is sucked into the indoor fan 14 through the suction port 12 and the indoor heat exchanger 13 by the operation of the indoor fan 14, and blown out from the blower outlet 15 through the blowout passage 18 from the indoor fan 14.

  Furthermore, a lower suction port 21 is provided on the lower surface of the main casing 11 on the wall side with respect to the air outlet 15. The lower suction port 21 is connected to the inside of the main body casing 11 by a suction flow path 22, and the suction flow path 22 is formed along the scroll 17 from the lower suction port 21. That is, the suction flow path 22 is adjacent to the blowout flow path 18 with the scroll 17 interposed therebetween.

  The indoor air near the lower suction port 21 is sucked into the indoor fan 14 via the lower suction port 21, the suction flow path 22, the filter 24 and the indoor heat exchanger 13 by the operation of the indoor fan 14, and is blown out from the indoor fan 14. 18 is blown out from the outlet 15.

  The control unit 40 is located on the right side of the indoor heat exchanger 13 and the indoor fan 14 when the main body casing 11 is viewed from the front panel 11b, and controls the rotational speed of the indoor fan 14, the wind direction adjusting blade 31 and the Coanda blade 32. Perform motion control.

(2) Detailed configuration (2-1) Front panel 11b
As shown in FIG. 1, the front panel 11 b extends toward the front edge of the lower horizontal plate 11 d while drawing a gentle arc curved surface from the upper front of the main body casing 11. There is a region recessed toward the inside of the main body casing 11 at the bottom of the front panel 11b. The depth of the depression in this region is set so as to match the thickness dimension of the Coanda blade 32, and constitutes a housing portion 130 in which the Coanda blade 32 is housed. The surface of the accommodating part 130 is also a gentle circular curved surface.

(2-2) Air outlet 15
As shown in FIG. 1, the blower outlet 15 is formed in the lower part of the main body casing 11, and is a rectangular opening which makes a horizontal direction (direction orthogonal to FIG. 2 paper surface) a long side. The lower end of the blower outlet 15 is in contact with the front edge of the lower horizontal plate 11d, and the virtual plane connecting the lower end and the upper end of the blower outlet 15 is inclined forward and upward.

(2-3) Scroll 17
The scroll 17 is a partition wall curved so as to face the indoor fan 14 and is a part of the bottom frame 16. The end F of the scroll 17 reaches the vicinity of the periphery of the air outlet 15. The air passing through the blowout flow path 18 travels along the scroll 17 and is sent in the tangential direction of the end F of the scroll 17. Therefore, if there is no wind direction adjusting blade 31 at the blowout port 15, the wind direction of the conditioned air blown out from the blowout port 15 is a direction substantially along the tangent to the terminal end F of the scroll 17.

(2-4) Vertical wind direction adjusting plate 20
As shown in FIG. 1, the vertical wind direction adjusting plate 20 includes a plurality of blade pieces 201 and a connecting rod 203 that connects the plurality of blade pieces 201. Further, the vertical air direction adjusting plate 20 is disposed nearer the indoor fan 14 than the air direction adjusting blades 31 in the blowout flow path 18.

  The plurality of blade pieces 201 swing left and right around a state perpendicular to the longitudinal direction as the connecting rod 203 horizontally reciprocates along the longitudinal direction of the outlet 15. The connecting rod 203 is horizontally reciprocated by a motor (not shown).

(2-5) Wind direction adjusting blade 31
The wind direction adjusting blade 31 has a hollow structure in which two plate-like members are overlapped with a gap. Further, the wind direction adjusting blade 31 has an area that can block the air outlet 15. In the state where the airflow direction adjusting blade 31 closes the air outlet 15, the outer side surface 31 a is finished to have a gentle circular curved surface that protrudes outwardly as if it is an extension of the curved surface of the front panel 11 b. Further, the inner side surface 31b (see FIG. 2) of the wind direction adjusting blade 31 also forms an arcuate curved surface substantially parallel to the outer surface.

  The wind direction adjusting blade 31 has a rotation shaft 311 at the lower end. The rotating shaft 311 is connected to the rotating shaft of a stepping motor (not shown) fixed to the main body casing 11 in the vicinity of the lower end of the air outlet 15.

  The rotation shaft 311 rotates counterclockwise when viewed from the front in FIG. 2, so that the upper end of the airflow direction adjusting blade 31 moves away from the upper end side of the air outlet 15 to open the air outlet 15. On the contrary, when the rotation shaft 311 rotates in the clockwise direction in front view in FIG. 2, the upper end of the wind direction adjusting blade 31 operates so as to approach the upper end side of the outlet 15 to close the outlet 15.

  In a state where the airflow direction adjusting blade 31 opens the air outlet 15, the conditioned air blown out from the air outlet 15 flows substantially along the inner side surface 31 b of the airflow direction adjusting blade 31.

(2-6) Coanda blade 32
The Coanda blade 32 has a two-layer structure in which two plate-like members are overlapped. The Coanda blade 32 is stored in the storage unit 130 while the air-conditioning operation is stopped or in an operation in the normal blowing mode described later. The Coanda blade 32 moves away from the accommodating portion 130 by rotating. The rotation shaft 321 of the Coanda blade 32 is provided in the vicinity of the lower end of the housing portion 130 and inside the main body casing 11 (a position above the upper wall of the blowout flow path 18). The rotating shaft 321 is connected with a predetermined interval. Therefore, as the rotation shaft 321 rotates and the Coanda blade 32 moves away from the accommodating portion 130, the height position of the lower end of the Coanda blade 32 rotates so as to become lower. In addition, the inclination when the Coanda blade 32 rotates and opens is gentler than the inclination of the accommodating portion 130.

  In the present embodiment, the accommodating portion 130 is provided outside the air passage, and the entire Coanda blade 32 is accommodated outside the air passage when being accommodated.

  Further, when the rotation shaft 321 rotates counterclockwise when viewed from the front in FIG. 2, the upper end and the lower end of the Coanda blade 32 move away from the accommodating portion 130 while drawing an arc. The shortest distance is larger than the shortest distance between the lower end and the accommodating portion 130. Then, when the rotation shaft 321 rotates in the clockwise direction in front view in FIG. 2, the Coanda blade 32 approaches the storage unit 130 and is finally stored in the storage unit 130. The operating state of the Coanda blade 32 includes a state where the Coanda blade 32 is housed in the storage unit 130, a posture rotated and tilted forward and upward, a posture rotated and substantially horizontal, and a posture rotated and tilted forward and downward. is there.

  In a state where the Coanda blade 32 is housed in the housing portion 130, the outer surface 32a of the Coanda blade 32 is finished to a gentle circular curved surface that protrudes outwardly as if it is an extension of the gentle circular curved surface of the front panel 11b. . Further, the inner side surface 32 b of the Coanda blade 32 is finished to have an arcuate curved surface that follows the surface of the housing portion 130.

  Further, the dimension in the longitudinal direction of the Coanda blade 32 is set to be equal to or larger than the dimension in the longitudinal direction of the wind direction adjusting blade 31. This is because all the conditioned air whose direction is adjusted by the wind direction adjusting blade 31 is received by the Coanda blade 32, and its purpose is to prevent the conditioned air from the side of the Coanda blade 32 from short-circuiting.

(3) Direction control of conditioned air The air conditioning indoor unit 10 of the present embodiment is a normal blowing mode in which only the wind direction adjusting blade 31 is rotated to adjust the conditioned air blowing direction as means for controlling the conditioned air blowing direction. And a Coanda effect utilization mode in which the conditioned air is turned along the outer surface 32a of the Coanda blade 32 by rotating the wind direction adjusting blade 31 and the Coanda blade 32 and by the Coanda effect.

  Since the attitude | position of the wind direction adjustment blade | wing 31 and the Coanda blade | wing 32 changes for every blowing direction of air in each said mode, each attitude | position is demonstrated, referring FIG. 3A-FIG. 3D.

(3-1) Normal blowing mode The normal blowing mode is a mode in which only the wind direction adjusting blade 31 is rotated to adjust the blowing direction of the conditioned air, and includes “normal pre-blowing” and “normal forward lower blowing”. .

(3-1-1) Normal Front Blow FIG. 3A is a side view of the wind direction adjusting blade 31 and the Coanda blade 32 during normal front blow. In FIG. 3A, for example, when the user selects “normal pre-blowing” via a remote controller (not shown), the control unit 40 moves the wind direction adjusting blade 31 to a position where the inner side surface 31b of the wind direction adjusting blade 31 is substantially horizontal. Rotate. In addition, when the inner side surface 31b of the wind direction adjustment blade | wing 31 has comprised the circular arc curved surface like this embodiment, the wind direction adjustment blade | wing 31 is rotated until the tangent in the front end E1 of the inner side surface 31b becomes substantially horizontal. As a result, the conditioned air is in a front blowing state.

(3-1-2) Normal Front Down Blow FIG. 3B is a side view of the wind direction adjusting blade 31 and the Coanda blade 32 during normal front down blowing. In FIG. 3B, for example, when the user wants to direct the blowing direction downward from “normal forward blowing”, “normal forward downward blowing” may be selected via the remote control.

  At this time, the control unit 40 rotates the wind direction adjusting blade 31 until the tangent at the front end E1 of the inner side surface 31b of the wind direction adjusting blade 31 becomes lower than the horizontal. As a result, the conditioned air is in a front lower blowing state.

(3-2) Coanda effect utilization mode Coanda (effect) means that if there is a wall near the flow of gas or liquid, it flows in the direction along the wall even if the direction of flow and the direction of the wall are different. It is a phenomenon to try (Asakura Shoten "Dictionary of Law"). The Coanda utilization mode includes “Coanda airflow front blowing” and “Coanda airflow ceiling blowing” using this Coanda effect.

(3-2-1) Coanda Airflow Forward Blow FIG. 3C is a side view of the wind direction adjusting blade 31 and the Coanda blade 32 during the Coanda airflow forward blow. In FIG. 3C, when “Coanda airflow forward blowing” is selected, the control unit 40 moves the airflow direction adjustment blade 31 until the tangent L1 at the front end E1 of the inner side surface 31b of the airflow direction adjustment blade 31 becomes lower than the horizontal. Rotate.

  Next, the control unit 40 rotates the Coanda blade 32 until the outer surface 32a of the Coanda blade 32 becomes substantially horizontal. When the outer side surface 32a of the Coanda blade 32 has an arcuate curved surface as in the present embodiment, the Coanda blade 32 is rotated until the tangent L2 at the front end E2 of the outer surface 32a becomes substantially horizontal.

  The conditioned air adjusted by the wind direction adjusting blade 31 to the front lower blowing becomes a flow attached to the outer surface 32a of the Coanda blade 32 by the Coanda effect, and changes to a Coanda airflow along the outer surface 32a.

  Therefore, even if the tangent L1 direction at the front end E1 of the airflow direction adjusting blade 31 is the front lower blowing, the tangential L2 direction at the front end E2 of the Coanda blade 32 is horizontal, so that the conditioned air is caused by the Coanda effect. It blows off in the tangent L2 direction at the front end E2 of the outer surface 32a, that is, in the horizontal direction.

  In this way, the Coanda blades 32 are separated from the housing portion 130 and the inclination becomes gentle, and the conditioned air becomes more susceptible to the Coanda effect in front of the front panel 11b. As a result, even if the conditioned air whose wind direction has been adjusted by the wind direction adjusting blade 31 is the front lower blowing, it becomes horizontal blowing air due to the Coanda effect.

(3-2-2) Coanda Airflow Ceiling Blow FIG. 3D is a side view of the wind direction adjusting blade 31 and the Coanda blade 32 when the Coanda airflow ceiling is blown. In FIG. 3D, when “Coanda airflow ceiling blowing” is selected, the control unit 40 rotates the airflow direction adjusting blade 31 until the tangent L1 at the front end E1 of the inner side surface 31b of the airflow direction adjusting blade 31 becomes horizontal.

  Next, the control part 40 rotates the Coanda blade | wing 32 until the tangent L2 in the front end E2 of the outer side surface 32a becomes front upward. The conditioned air adjusted to be blown horizontally by the airflow direction adjusting blade 31 becomes a flow adhered to the outer surface 32a of the Coanda blade 32 by the Coanda effect, and changes to a Coanda airflow along the outer surface 32a.

  Therefore, even if the tangent L1 direction at the front end E1 of the wind direction adjusting blade 31 is forward blowing, the tangential L2 direction at the front end E2 of the Coanda blade 32 is forward upward blowing, so that the conditioned air is caused by the Coanda effect. It blows out in the tangent L2 direction at the front end E2 of the outer side surface 32a, that is, the ceiling direction. Since the front end portion of the Coanda blade 32 protrudes outward from the air outlet 15, the Coanda airflow reaches further away.

  In this way, the Coanda blades 32 are separated from the housing portion 130 and the inclination becomes gentle, and the conditioned air becomes more susceptible to the Coanda effect in front of the front panel 11b. As a result, even if the conditioned air whose wind direction is adjusted by the wind direction adjusting blade 31 is blown forward, it becomes upward air due to the Coanda effect.

  The size in the longitudinal direction of the Coanda blade 32 is not less than the size in the longitudinal direction of the wind direction adjusting blade 31. Therefore, all of the conditioned air whose wind direction is adjusted by the wind direction adjusting blade 31 can be received by the Coanda blade 32, and the effect of preventing the conditioned air from being short-circuited from the side of the Coanda blade 32 is also achieved.

(4) Prevention of short circuit flow during wind improvement direction As shown in FIG. 3D, there is a certain gap G between the air outlet 15 and the rear end of the Coanda blade 32. Therefore, when the wind direction is upward (ceiling blow), a part of the conditioned air that has come out from the blowout port 15 rises from the gap G along the accommodating portion 130 on the front surface of the main casing 11 and flows into the suction port 12 as it is. Can cause a short circuit. When the short circuit occurs, the conditioned air is sucked into the suction port 12 without circulating through the room, so that the room is not air-conditioned.

  Therefore, in the present embodiment, a configuration is adopted in which the conditioned air blown out from the blowout port 15 is made to flow along the outer side surface 32a of the Coanda blade 32 while suppressing the flow into the gap G. Hereinafter, the configuration will be described with reference to the drawings.

  The rear end of the Coanda blade 32 is an end on the side close to the outlet 15 of the two ends of the Coanda blade 32 as shown in FIG. 3D. Further, the front end of the Coanda blade 32 is an end of the two ends of the Coanda blade 32 that is far from the outlet 15.

(4-1) Convex part 150
FIG. 4 is a cross-sectional view of the upper wall of the air outlet 15. In FIG. 4, a convex portion 150 is formed on the upper wall of the air outlet 15. The outlet 15 corresponds to the final end of the outlet channel 18, and the upper wall of the outlet 15 can be said to be a part of the upper wall 18 a of the outlet channel 18.

  Since the upper wall 18a of the blowout flow path 18 is inclined downward from the indoor fan 14 side toward the blowout port 15, the upper wall 18a forms an inclined surface 18aa. The inclined surface 18aa is formed with a first curved surface 151 whose curvature gradually increases as it approaches the convex portion 150 from the middle. The first curved surface 151 is a curved surface that terminates at the top 153 of the convex portion 150 and is recessed upward from the top 153.

  The upper wall 18a is inclined upward toward the lower end of the accommodating portion 130 immediately after the top portion 153 of the convex portion 150 is exceeded, and an inclined surface 18ab is formed there. The inclined surface 18ab is formed with a second curved surface 152 in which the curvature gradually decreases as the distance from the top 153 of the convex portion 150 increases. In other words, the curvature of the second curved surface 152 gradually increases as it approaches the convex portion 150 from the middle of the inclined surface 18ab. That is, the second curved surface 152 is a curved surface that ends at the top 153 of the convex portion 150 and is recessed upward from the top 153.

  Since the top portion 153 is sandwiched between two curved surfaces that are recessed upward, the apex angle is relatively small. For example, in the present embodiment, the angle M between the lines connecting the end points on the top side of the first curved surface 151 and the second curved surface 152 and the points 2 mm from each end point, and the first curved surface 151 and the second curved surface 152 The relationship with the angle N between the virtual tangents at each end on the apex side of the curved surface 152 is MN = 0 to 5 °, and M is in the range of 60 ° to 120 °.

  Due to the presence of such a convex portion 150, the conditioned air flowing through the blowout flow path 18 passes through the top portion 153 along the first curved surface 151. Since the first curved surface 151 is a curved surface that is recessed above the top portion 153, the conditioned air passing through the top portion 153 is blown obliquely downward. As a result, since the conditioned air flows away from the gap G between the outlet 15 and the rear end of the Coanda blade 32 (arrow in FIG. 6), a situation where the conditioned air causes a short circuit through the gap G is avoided. .

(4-2) End of Coanda Blade 32 FIG. 5 is a cross-sectional view of the Coanda blade 32 taking an upward blowing posture. In FIG. 5, the rear end portion of the Coanda blade 32 is chamfered so as to taper from the outer surface 32 a side toward the rear end. The inclined portion formed by the chamfering is called a first tapered shape portion 326.

  Further, the front end portion of the Coanda blade 32 is also chamfered so as to taper from the outer surface 32a side toward the front end. The inclined portion formed by the chamfering is called a second tapered portion 327.

  Of the taper surfaces of the first taper shape portion 326 and the second taper shape portion 327, the length of the conditioned air in the flow direction (hereinafter referred to as the taper surface length) is the first taper shape as compared with the second taper shape portion 327. The part 326 is longer. Therefore, in the Coanda blade 32 having the upward blowing posture as shown in FIG. 5, the tapered surface of the first tapered portion 326 is a tapered surface with a gentler slope than the second tapered portion 327. In the present embodiment, the taper length of the first taper-shaped portion 326 is set to be 1.5 to 2 times the thickness dimension of the Coanda blade 32.

  In FIG. 5, the angle P between the outer surface 32a of the Coanda blade 32 and the tapered surface of the first tapered portion 326 is set within a range of 20 ° to 40 °. In the present embodiment, since the outer surface 32a is a curved surface, in this case, the angle between the tangent line passing through the curved surface end near the first tapered portion 326 and the tapered surface of the first tapered portion 326. Is adopted as the angle P.

  The purpose of forming the first tapered portion 326 as described above is to smoothly guide the conditioned air blown from the blowout port 15 to the outer surface 32a of the Coanda blade 32. If the corner on the outer surface 32a side is angular at the rear end of the Coanda blade 32, the airflow of the conditioned air is, due to the angular corner, the airflow toward the gap G between the outlet 15 and the rear end of the Coanda blade 32, There is a high possibility that a short circuit is generated by the air flow toward the gap G, which is divided into the air flow toward the outer surface 32a of the Coanda blade 32.

  Further, the airflow toward the outer surface 32 a is also disturbed by the corner edge, and it becomes difficult to follow the outer surface 32 a of the Coanda blade 32.

  However, since the first taper-shaped portion 326 is formed, the flow angle of the conditioned air flow and the taper angle of the first taper-shaped portion 326 approach each other, so that the air flow is smoothly guided to the outer surface 32a of the Coanda blade 32. It is burned.

  On the other hand, when the Coanda airflow flowing along the outer side surface 32a of the Coanda blade 32 moves away from the Coanda blade 32, the turbulent flow generation on the downstream side of the Coanda blade 32 can proceed in the target direction (upward). Should be suppressed.

  If the front end of the Coanda blade 32 is an angular corner, the magnitude of the turbulent flow on the downstream side of the corner becomes large, so there is a possibility that the airflow beyond the corner cannot advance in the target direction due to resistance.

  The scale of the turbulent flow increases when the shape of the surface along which the air flow changes suddenly. Therefore, in this embodiment, the 2nd taper-shaped part 327 is provided in the front-end part of the Coanda blade | wing 32, and the shape of the surface which a Coanda air current follows changes gradually. That is, the second tapered portion 327 is a separation inducing portion that separates the airflow from the Coanda blade 32 while suppressing the occurrence of turbulent flow. Note that the separation inducing portion does not necessarily have a tapered shape, and may be any device as long as the airflow is separated from the Coanda blade 32 while suppressing the generation of turbulent flow.

  However, if the taper surface of the second taper-shaped portion 327 is set to be long, the airflow changes along the taper surface, and it may not be possible to proceed in the target direction. Therefore, in the present embodiment, the taper length of the second taper shape portion 327 is set to 50 to 70% of the taper length of the first taper shape portion 326.

  Further, the angle Q between the outer surface 32a of the Coanda blade 32 and the tapered surface of the second tapered portion 327 is set within a range of 20 ° to 40 °. In the present embodiment, since the outer surface 32a is a curved surface, in this case, the angle between the tangent line passing through the curved surface end near the second tapered portion 327 and the tapered surface of the second tapered portion 327. Is adopted as the angle Q.

(4-3) Flow of conditioned air at the time of wind improvement FIG. 6 is a cross-sectional view of the upper wall of the air outlet 15 and the Coanda blade 32 in an upward posture. In FIG. 6, the arrows drawn with a dotted line and a two-dot chain line represent the flow of conditioned air. The conditioned air from the upstream side of the blowout channel 18 toward the blowout port 15 flows along the inclined surface 18aa of the upper wall 18a of the blowout channel 18.

  The conditioned air that has reached the first curved surface 151 flows along the first curved surface 151 toward the top 153. Since the first curved surface 151 is upstream of the flow of conditioned air as viewed from the top 153 and is recessed upward from the top 153, the flow of the conditioned air along the first curved surface 151 is obliquely forward and downward. The flow is deflected. Therefore, when the conditioned air exceeds the top portion 153, the conditioned air becomes an airflow that goes away from the gap G between the blowout port 15 and the rear end of the Coanda blade 32.

  A part of the airflow (dotted arrow in FIG. 6) hits the first tapered portion 326 of the Coanda vane 32, and the remaining (two-dot chain line arrow) reaches the outer surface 32a of the Coanda vane 32, along the outer surface 32a. Coanda airflow.

  The airflow hitting the first tapered portion 326 of the Coanda blade 32 advances along the tapered surface of the first tapered portion 326. In the Coanda blade 32 in the upward posture, the taper surface of the first taper-shaped portion 326 is inclined obliquely downward and forward, so that the airflow that hits the first taper-shaped portion 326 is the rear end of the air outlet 15 and the Coanda blade 32. Without flowing toward the gap G, the air flows to the outer surface 32a of the Coanda blade 32 and becomes a Coanda airflow along the outer surface 32a.

  The Coanda airflow flows along the outer surface 32 a of the Coanda blade 32 and reaches the front end of the Coanda blade 32. A second tapered portion 327 is formed at the front end portion. For this reason, since the outer surface 32a is not an edge shape that suddenly disappears, even if a turbulent flow occurs downstream of the second tapered portion 327, the scale of the turbulent flow is larger than that without the second tapered portion 327. It is small and is unlikely to become a resistance that hinders the progression of the Coanda airflow. Therefore, even after the Coanda airflow is peeled off from the outer surface 32a of the Coanda blade 32, it proceeds as an upward airflow as intended.

(5) Features (5-1)
In this air conditioning indoor unit 10, since the first tapered portion 326 is formed at the rear end portion of the Coanda blade 32 that receives the conditioned air blown out from the air outlet 15, the conditioned air is more than in the state where the taper is not formed. Can be easily guided to the outer surface 32a of the Coanda blade 32, and a short circuit flow that is directed toward the suction port 12 along the front surface of the main body casing 11 without facing the outer surface 32a can be suppressed.

(5-2)
Further, a second tapered portion 327 is provided at the front end portion of the Coanda blade 32. The taper length of the second tapered portion 327 is smaller than that of the first tapered portion 326. The airflow along the outer surface 32a of the Coanda blade 32 leaves at the front end of the Coanda blade 32, but by reducing the taper length of the front end portion, the generation of turbulence on the downstream side of the front end is suppressed and the airflow from the lower surface is reduced. Delamination can be induced.

  As described above, the present invention is useful for an air conditioning indoor unit including a ceiling blowing mode.

DESCRIPTION OF SYMBOLS 10 Air-conditioning indoor unit 11 Main body casing 12 Inlet 15 Outlet 32 Coanda blade | wing 326 1st taper shape part 327 2nd taper shape part

JP 2002-61938 A

Claims (3)

A wall-hanging air-conditioning indoor unit having a function of adjusting the direction of the conditioned air blown from the air outlet (15),
A main body casing (11) having a suction port (12) positioned above the air outlet (15) and the air outlet (15);
A Coanda blade (32) that is provided in the vicinity of the air outlet (15) and guides the conditioned air into a Coanda airflow along its lower surface by the Coanda effect in a predetermined direction;
With
The rear end of the Coanda blade (32) is located in front of the air outlet (15) and in the vicinity of the upper end of the air outlet (15),
A first tapered shape portion (326) that guides the conditioned air that exits from the air outlet (15) to the lower surface is provided at a rear end portion of the Coanda blade (32).
Air conditioning indoor unit. A second tapered portion (327) is provided at the front end of the Coanda blade (32);
The taper length of the second tapered portion (327) is smaller than that of the first tapered portion (326).
The air conditioning indoor unit according to claim 1. At the front end of the Coanda blade (32), a peeling guiding part is provided to facilitate peeling of the conditioned air from the lower surface.
The air conditioning indoor unit according to claim 1.

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