JP6077245B2 - Air conditioning indoor unit - Google Patents

Description

  The present invention relates to an air conditioning indoor unit.

  In recent years, in order to improve the comfort of living space, efforts have been made to bring the conditioned air blown from the air-conditioning indoor unit closer to a natural airflow. For example, an air conditioner described in Patent Document 1 (Japanese Patent Application Laid-Open No. 8-86502) performs fluctuation control that changes the air volume within a certain range and with an irregular cycle according to the set reference air volume. The user can feel more comfortable than when blowing a constant air volume.

  However, if the fluctuation control that changes the air volume as described above is performed in a quiet room, the sound at the time of fan motor rotation speed fluctuation may become unpleasant noise for the user and conversely impair comfort. There is.

  The subject of this invention is providing the air-conditioning indoor unit which makes it possible to adjust the sound at the time of fluctuation control by the user side.

  An air conditioning indoor unit according to a first aspect of the present invention is an air conditioning indoor unit including a control unit that is configured to be able to select fluctuation airflow control that irregularly changes the air volume of conditioned air, and selects fluctuation airflow control. And a control unit having one of the first function and the second function. The first function changes the set value of the change amount of the air volume in the fluctuation air flow control. The second function changes the set value of the change rate of the air volume in the fluctuation air flow control. The selection means is provided with an input unit for a user to input a set value.

  In this air conditioning indoor unit, both the first function and the second function can be set so as to reduce the amount of change in the air volume per unit time, and the user can suppress the sound when changing the air volume as necessary. Because it is possible, it is easy to use.

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, wherein the control unit has the first function. The first function is a function for changing the magnitude of increase / decrease in the air volume.

  In this air conditioner indoor unit, for example, the acceleration of the fan motor can be suppressed, so that noise such as a beep can be suppressed accordingly.

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, and the control unit has the second function. The second function is a function for changing the time interval of increase / decrease of the air volume.

  In this air conditioner indoor unit, for example, the number of rotations of the fan motor can be increased or decreased gradually, so that noise such as a beep can be suppressed accordingly.

  An air conditioning indoor unit according to a fourth aspect of the present invention is the air conditioning indoor unit according to the second aspect, wherein the control unit fixes the air volume at one stage in an air volume range composed of a plurality of stages, or the air volume is fixed. Set the air volume to one of the automatic air volume controls automatically, and the fluctuation air flow control selected when the air volume setting immediately before the fluctuation air flow control is selected is fixed as the first fluctuation air flow control. The fluctuation airflow control selected when the airflow setting immediately before the airflow control is selected is automatic airflow is recognized as the second fluctuation airflow control. Further, the control unit stores in advance an allowable change width of the increase / decrease amount of the air volume. The allowable change width is set so that the amount of increase / decrease in the air volume in the first fluctuation airflow control is smaller than that in the second fluctuation airflow control.

  In this air conditioning indoor unit, the fluctuation airflow control selected when the airflow is fixed, such as the first fluctuation airflow control, is irregularly increased or decreased based on the fixed airflow at that time. When the air volume is high, the sound when the air volume increases or decreases becomes loud. Therefore, the allowable change width is set so that the magnitude of the increase / decrease in the air volume in the first fluctuation airflow control becomes smaller than that in the second fluctuation airflow control, and noise such as a roaring sound is suppressed.

  An air conditioning indoor unit according to a fifth aspect of the present invention is the air conditioning indoor unit according to the third aspect, wherein the control unit fixes the air volume at one stage in an air volume range consisting of a plurality of stages, or the air volume is adjusted. Set the air volume to one of the automatic air volume controls automatically, and the fluctuation air flow control selected when the air volume setting immediately before the fluctuation air flow control is selected is fixed as the first fluctuation air flow control. The fluctuation airflow control selected when the airflow setting immediately before the airflow control is selected is automatic airflow is recognized as the second fluctuation airflow control. Further, the control unit stores in advance an allowable change width of the time interval for increasing or decreasing the air volume. The allowable change width is set so that the time interval of increase / decrease in the air volume in the first fluctuation airflow control is larger than that in the second fluctuation airflow control.

  In this air conditioning indoor unit, for example, by setting the allowable change width so that the time interval of increase / decrease in the air volume in the first fluctuation airflow control becomes larger than that in the second fluctuation airflow control, for example, the rotational speed of the fan motor is moderated. Since it can be increased or decreased, noise such as beating can be suppressed accordingly.

  In the air conditioning indoor unit pertaining to the first aspect of the present invention, both the first function and the second function can be set so as to reduce the amount of change in air volume per unit time, and the user can change the air volume as necessary. Since the sound of the time can be suppressed, it is easy to use.

  In the air conditioning indoor unit according to the second aspect of the present invention, since the acceleration of the fan motor can be suppressed, it is possible to suppress noise such as a beat noise.

  In the air-conditioning indoor unit according to the third aspect of the present invention, the number of rotations of the fan motor can be increased or decreased gradually, so that noise such as beating can be suppressed accordingly.

  In the air conditioning indoor unit according to the fourth aspect of the present invention, the allowable change width is set so that the amount of increase / decrease in the air volume in the first fluctuation airflow control becomes smaller than that in the second fluctuation airflow control, I try to suppress noise.

  In the air conditioning indoor unit according to the fifth aspect of the present invention, by setting the allowable change width so that the time interval of increase / decrease in the air volume in the first fluctuation airflow control is larger than that in the second fluctuation airflow control, for example, Since the number of rotations of the fan motor can be increased / decreased gently, noise such as beating can be suppressed accordingly.

Sectional drawing of the air-conditioning indoor unit at the time of the operation stop which concerns on one Embodiment of this invention. A sectional view of an air-conditioning indoor unit at the time of operation. The side view of the wind direction adjustment blade | wing and Coanda blade | wing when conditioned air is normally blown forward. The side view of the wind direction adjustment blade | wing and Coanda blade | wing at the time of conditioned air normally blowing forward lower. 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. The conceptual diagram which shows the direction of conditioned air, and the direction of Coanda airflow. The conceptual diagram showing an example of the opening angle of a wind direction adjustment blade | wing and a Coanda blade | wing. The comparison figure of the internal angle which the tangent of the scroll end F at the time of Coanda airflow front blowing and the Coanda blade | wing make, and the internal angle which the tangent of the scroll end F and the wind direction adjustment blade | wing make. The comparison figure of the interior angle which the tangent of the terminal F of a scroll at the time of Coanda airflow ceiling blowing and the Coanda blade | wing consist, and the internal angle which the tangent of the terminal F of a scroll and a wind direction adjustment blade | wing form. The side view of the air-conditioning indoor unit installation space which shows the wind direction of the conditioned air by the vertical swing of a wind direction adjustment blade. The side view of the air-conditioning indoor unit installation space which shows the wind direction of the conditioned air at the time of a wind direction adjustment blade | wing facing down. The side view of the air-conditioning indoor unit installation space which shows the wind direction of Coanda airflow when the attitude | position of a Coanda blade | wing is a ceiling blowing attitude | position. The flowchart which shows the wind direction adjustment blade | wing at the time of fluctuation airflow B control, the operation | movement of a Coanda blade | wing, and the fan rotation speed of an indoor fan. Fan rotation speed variation pattern table for indoor fans. The flowchart of the fluctuation amount correction | amendment of the fan rotation speed in fluctuation airflow control. The flowchart of the fluctuation amount correction | amendment of the fan rotation speed in fluctuation airflow control.

  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 cross-sectional view of the air conditioning indoor unit 10 when operation is stopped according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the air conditioning indoor unit 10 during operation. 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, and a control unit 40 therein. .

  The top surface part 11a is located in the upper part of the main body casing 11, and the inlet (not shown) is provided in the front part of the top surface part 11a.

  The front panel 11b constitutes the front part of the indoor unit, and has a flat shape without a suction port. 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.

  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 direction of the conditioned air, and can also open and close the air outlet 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 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.

  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 the paper surface of FIG. 1) 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 air outlet 15, the air direction of the conditioned air blown out from the air outlet 15 is a direction substantially along the tangent L 0 of the terminal end F of the scroll 17.

(2-4) Vertical wind direction adjusting plate 20
As shown in FIGS. 1 and 2, 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 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. 1, so that the upper end of the airflow direction adjusting blade 31 moves away from the upper end side of the outlet 15 to open the outlet 15. On the contrary, when the rotation shaft 311 rotates in the clockwise direction in FIG. 1, 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. In other words, the conditioned air blown out substantially along the tangential direction of the terminal end F of the scroll 17 has its wind direction changed slightly upward by the wind direction adjusting blade 31.

(2-6) Coanda blade 32
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 housing portion 130 of the front surface of the indoor unit, the height position of the lower end of the Coanda blade 32 rotates so as to become lower. Further, the inclination when the Coanda blade 32 rotates and opens is gentler than the inclination of the front surface of the indoor unit.

  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. Instead of this structure, only a part of the Coanda blade 32 may be accommodated outside the air passage, and the rest may be accommodated in the air passage (for example, the upper wall portion of the air passage).

  Further, when the rotating shaft 321 rotates counterclockwise in the front view of FIG. 1, the upper and lower ends of the Coanda blades 32 are separated from the housing portion 130 while drawing an arc. The shortest distance between the accommodation unit 130 on the front surface of the indoor unit is larger than the shortest distance between the lower end and the accommodation unit 130. That is, the Coanda blade 32 is controlled so as to move away from the front surface of the indoor unit as it goes forward. Then, when the rotation shaft 321 rotates in the clockwise direction in the front view of FIG. 1, 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) Controlling the direction of conditioned air The air conditioning indoor unit of the present embodiment, as means for controlling the direction of conditioned air, is a normal blowing mode in which only the wind direction adjusting blade 31 is rotated to adjust the direction of conditioned air, and the wind direction. The adjustment vane 31 and the Coanda vane 32 are rotated, and the Coanda effect utilization mode in which the conditioned air is made into a Coanda airflow along the outer surface 32a of the Coanda vane 32 by the Coanda effect is provided.

  Since the postures of the wind direction adjusting blade 31 and the Coanda blade 32 change for each air blowing direction in each mode, each posture will be described with reference to the drawings. It should be noted that the blowing direction can be selected by the user via a remote controller or the like. It is also possible to control the mode change and the blowing direction to be automatically changed.

(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 direction of the conditioned air, and includes “normal forward 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 when the conditioned air is normally forward blown. In FIG. 3A, when the user selects “normal blow”, the control unit 40 rotates the wind direction adjusting blade 31 to a position where the inner side surface 31b of the wind direction adjusting blade 31 becomes substantially horizontal. 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 when the conditioned air is normally forward down blown. In FIG. 3B, when the user wants to direct the blowing direction downward from “normal forward blowing”, the user may select “normal forward lower blowing”.

  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.

(3-1-3) Wind Direction Automatic FIG. 6A is a side view of the air conditioning indoor unit installation space showing the wind direction of the conditioned air by the vertical swing of the wind direction adjusting blade 31. The wind direction adjustment as shown in FIG. 6A is a wind direction adjustment by a so-called auto louver function, which is also implemented in a conventional product, and is used as a means for repeating the operation of applying or not applying the wind to the human body 400.

(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.

  The direction of the conditioned air and the direction of the Coanda airflow differ depending on how the reference position is determined, but an example is shown below. FIG. 4A is a conceptual diagram showing the direction of conditioned air and the direction of Coanda airflow. In FIG. 4A, in order to produce the Coanda effect on the outer surface 32a side of the Coanda blade 32, the inclination of the conditioned air direction (D1) changed by the wind direction adjusting blade 31 is close to the posture (inclination) of the Coanda blade 32. There is a need. If they are too far apart, the Coanda effect will not occur. Therefore, in this Coanda effect utilization mode, the Coanda blade 32 and the wind direction adjusting blade 31 need to be equal to or less than a predetermined opening angle, and the above relationship is established so that both blades (31, 32) are within the range. Is established. Thereby, as shown in FIG. 4A, after the wind direction of the conditioned air is changed to D1 by the wind direction adjusting blade 31, it is further changed to D2 by the Coanda effect.

  Moreover, in the Coanda effect utilization mode of this embodiment, it is preferable that the Coanda blade | wing 32 exists in the front (downstream side of blowing) and the upper position of the wind direction adjustment blade | wing 31. FIG.

  The opening angle between the wind direction adjusting blade 31 and the Coanda blade 32 is defined differently depending on how to set the reference position, but an example is shown below. FIG. 4B is a conceptual diagram illustrating an example of an opening angle between the wind direction adjusting blade 31 and the Coanda blade 32. 4B, the angle between the straight line connecting the front and rear ends of the inner surface 31b of the wind direction adjusting blade 31 and the horizontal line is the inclination angle θ1 of the wind direction adjusting blade 31, and the straight line connecting the front and rear ends of the outer surface 32a of the Coanda blade 32 and the horizontal line Is the inclination angle θ2 of the Coanda blade 32, the opening angle between the wind direction adjusting blade 31 and the Coanda blade 32 is θ = θ2−θ1. Note that θ1 and θ2 are not absolute values, and are negative values when they are below the horizontal line in the front view of FIG. 4B.

  In both “Coanda airflow forward blowing” and “Coanda airflow ceiling blowing”, the wind direction adjusting blade 31 and the Coanda blade 32 have an inner angle formed by the tangent of the end F of the scroll 17 and the Coanda blade 32 and the tangent of the end F of the scroll 17. It is preferable to take a posture that satisfies the condition that it is larger than the inner angle formed by the wind direction adjusting blade 31.

  5A (the inner angle R2 formed by the tangent line L0 of the terminal end F of the scroll 17 and the Coanda blade 32 when the Coanda airflow is blown forward and the tangent line L0 of the terminal end F of the scroll 17 and the airflow direction adjusting blade 31 are formed. Comparison diagram with inner angle R1) and FIG. 5B (inner angle R2 formed between tangent L0 of end F of scroll 17 and Coanda blade 32 when Coanda airflow ceiling is blown, tangent L0 of end F of scroll 17 and wind direction adjusting blade 31) (Refer to the comparison figure with the internal angle R1).

  Further, as shown in FIGS. 5A and 5B, in the Coanda blade 32 in the Coanda effect utilization mode, the tip of the Coanda blade 32 is located forward and upward from the horizontal, and is located outward and upward from the air outlet 15. As a result, the Coanda airflow reaches further, and the generation of a strong airflow that passes above the Coanda blade 32 is suppressed, and the upward induction of the Coanda airflow is less likely to be inhibited.

  In addition, since the height position of the rear end portion of the Coanda blade 32 is lower than when the operation is stopped, a Coanda airflow is easily generated due to the Coanda effect on the upstream side.

(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. That is, as shown in FIG. 5A, the inner angle R2 formed by the tangent line L0 and the tangent line L2 is larger than the inner angle R1 formed by the tangent line L0 and the tangent line L1.

  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 generated by the Coanda effect by the Coanda effect. It blows off in the tangent L2 direction at the front end E2 of the outer side surface 32a, that is, in the horizontal direction.

  In this way, the Coanda blades 32 are separated from the front surface of the indoor unit 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. The air direction is changed while the pressure loss due to the airflow resistance of the air direction adjusting blade 31 is suppressed as compared with the method in which the air immediately after passing through the air outlet is brought close to the front panel and is directed upward by the Coanda effect of the front panel.

(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. That is, as shown in FIG. 5B, the inner angle R2 formed by the tangent line L0 and the tangent line L2 is larger than the inner angle R1 formed by the tangent line L0 and the tangent line L1. 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 generated by the Coanda effect 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. Furthermore, since the tip of the Coanda blade 32 is located above the air outlet 15, the generation of an airflow that passes above the Coanda blade 32 is suppressed, and the upward induction of the Coanda airflow is hardly inhibited. .

  In this way, the Coanda blades 32 are separated from the front surface of the indoor unit 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.

(3-2-3) Unexpected Wind FIG. 6B is a side view of the air-conditioning indoor unit installation space showing the wind direction of the conditioned air when the wind direction adjusting blade 31 faces downward. FIG. 6C is a side view of the air conditioning indoor unit installation space showing the wind direction of the Coanda airflow when the Coanda blade 32 is in the ceiling blowing posture.

  6B and 6C, the wind directed toward the human body 400 as shown in FIG. 6B is changed to the upward Coanda airflow as shown in FIG. 6C using the Coanda effect, and then the reverse operation is performed. An unexpected wind that suddenly hits the human body 400 can be created.

  For example, when the wind direction adjusting blade 31 directs conditioned air in the direction in which the resident is present, the boundary between the region in which the Coanda blade 32 generates the Coanda effect and the region in which the Coanda effect does not occur with an irregular cycle. When moving across the area, the generation and disappearance of the Coanda airflow is repeated, creating a wind that suddenly hits the resident.

(3-2-4) Fluctuating airflow Fluctuating airflow is airflow generated by irregularly changing the wind direction of conditioned air, and (3-1-3) in that the wind direction is irregularly changed. This is different from the automatic wind direction described in.

  FIG. 7 is a flowchart showing the operation of the wind direction adjusting blade 31 and the Coanda blade 32 and the fan rotation speed of the indoor fan 14 during fluctuation airflow control. In FIG. 7, the wind direction adjusting blade 31 swings between an upper limit position and a lower limit position with an operation of waiting at an intermediate position interposed therebetween. The control unit 40 irregularly changes the time during which the wind direction adjusting blade 31 waits at the intermediate position (hereinafter referred to as the intermediate position standby time), and thereby the wind moving away from the wind approaching the resident. Since the combination of the two is irregularly changed, it is possible to provide residents with various winds.

  Further, the Coanda blade 32 swings between the upper limit position and the lower limit position. As shown in FIG. 7, in the fluctuation airflow control, while the Coanda blade 32 swings between the upper limit position and the lower limit position, the airflow direction adjustment blade 31 swings between the upper limit position and the intermediate position. One pattern and a second pattern in which the wind direction adjusting blade 31 swings between the intermediate position and the lower limit position while the Coanda blade 32 stands by at the upper limit position are included.

  In the first pattern, the operation in which the Coanda blade 32 moves from the upper limit position to the lower limit position is synchronized with the timing at which the wind direction adjustment blade 31 moves from the intermediate position to the upper limit position. The operation of the Coanda blade 32 moving from the lower limit position to the upper limit position is synchronized with the timing when the wind direction adjusting blade 31 is moved from the upper limit position to the intermediate position.

  When the wind direction adjusting blade 31 is in the intermediate position, the Coanda blade 32 is controlled so as to be in the upper limit position, so that no Coanda airflow is generated. Therefore, when the intermediate position standby time of the wind direction adjusting blade 31 is irregularly changed, the time during which the Coanda airflow is not generated is irregularly changed, and the intervals at which the wind is unexpectedly changed are irregularly switched.

  In the intermediate position standby time of the wind direction adjusting blade 31, since it is desired to blow conditioned air stably in one direction, in this embodiment, the wind direction adjusting blade 31 is in the intermediate position and the Coanda blade 32 is in the upper limit position. Time is measured as standby time.

  As described above, the wind direction adjusting blade 31 and the Coanda blade 32 swing irregularly, so that conditioned air close to natural wind can be provided to the occupant.

(4) Airflow Control during Fluctuation Control In the fluctuation airflow control, the fan rotation speed of the indoor fan 14 is changed according to the operation of the airflow direction adjusting blade 31 and the Coanda blade 32 as well as the airflow direction.

  FIG. 8 is a fan rotation speed variation pattern table of the indoor fan 14. In FIG. 8, the first column represents a path to be advanced every time a predetermined time has elapsed, and in this embodiment, the predetermined time is set to 1 second. In each of the second to sixth columns, the variation amount of the fan rotation speed of the first pattern to the fifth pattern is represented.

  For example, when fluctuation airflow control is selected when the airflow is automatically controlled, the control unit 40 calculates a reference fan rotation speed suitable for fluctuation control and uses it in normal fixed airflow control [high speed , High / medium speed, medium speed, low / medium speed, low speed], the medium speed is compared with the calculated reference fan speed, and the higher one is set as the reference fan speed.

  Next, when changing the reference fan speed, the control unit 40 randomly selects one pattern from the first pattern to the fifth pattern, and the first to the 60th shown in the pattern are selected. The fluctuation amount is switched in turn every second, and the reference fan speed is increased or decreased. When the pattern ends, one pattern is irregularly selected again from the first pattern to the fifth pattern, and is similarly changed. The control unit 40 repeatedly performs such an operation during fluctuation control.

  However, when the Coanda blade 32 starts to move from the upper limit position to the lower limit position, there is a restriction that the reference fan speed of the indoor fan 14 is increased to a predetermined value. The predetermined value here refers to the number of rotations of the fan for ensuring the minimum air volume that allows the wind separated from the Coanda blades 32 to reach the occupant.

  That is, when the Coanda blade 32 starts to move from the upper limit position to the lower limit position, if the fan rotation speed of the indoor fan 14 rises to a predetermined value, the air current is peeled off from the Coanda blade 32 and directed to the resident. Unexpected wind is realized because the airflow surely reaches the residents.

  Then, when the Coanda blade 32 starts to move from the lower limit position to the upper limit position and the Coanda blade 32 reaches the upper limit position, the restriction is released, and the reference fan speed is changed according to the selected pattern.

(5) Correction of Fluctuation in Fan Rotation Speed However, when the fluctuation airflow control that fluctuates the airflow as described above is performed in a quiet room, the sound at the time of fan motor rotation speed fluctuation is uncomfortable for the user. There is a possibility that it becomes noise, and conversely, comfort is lost. Therefore, in the present embodiment, the resident can adjust the sound. Specifically, the resident can perform fluctuation airflow setting switching through the remote controller.

  By selecting the correction coefficient so as to reduce the fluctuation amount of the fan rotation speed by switching the fluctuation airflow setting, the fluctuation amount can be changed by applying the correction coefficient to the entire fluctuation amount of each pattern shown in FIG. it can.

  FIG. 9A and FIG. 9B are flowcharts for correcting the fluctuation amount of the fan rotation speed in the fluctuation airflow control.

(5-1) Steps S1 to S10
In FIG. 9A, the control unit 40 determines whether or not the fluctuation airflow control is turned on in step S1, and proceeds to step S2 if turned on, and continues step S1 if not turned on.

  In step S2, the control unit 40 determines whether or not the air volume is automatically set. If the air volume is automatic, the control section 40 proceeds to step S3. If the air volume is not automatic (that is, the air volume is fixed), the control section 40 proceeds to step S21. In step S3, the control unit 40 calculates the reference fan speed, and proceeds to step S4.

  In step S4, the control unit 40 determines whether or not the calculated reference fan rotational speed is equal to or higher than the low / medium speed rotational speed. If the calculated reference fan rotational speed is equal to or higher than the low / medium speed rotational speed (LM tap), the control unit 40 proceeds to step S5. If it is less than the medium speed (LM tap), the process proceeds to step S11.

  In step S5, the control unit 40 sets the calculated reference fan speed to the reference fan speed, and in step S11, sets the low / medium speed speed (LM tap) to the reference fan speed.

  In step S6, the control unit 40 determines whether or not a resident (user) has requested a fan rotation speed fluctuation amount correction. If there is a fluctuation amount correction request, the control unit 40 proceeds to step S7 to request a fluctuation amount correction request. If not, the process proceeds to step S9.

  In step S7, the controller 40 turns on the air volume automatic fluctuation amount correction function, and proceeds to step S8. In step S8, the control unit 40 determines whether or not a correction coefficient has been input. If it has been input, the control unit 40 proceeds to step S9, and if not input, continues to step 8.

  In the present embodiment, a fluctuation airflow setting switching unit is provided in the main body or the remote controller so that the resident can select either “automatic fluctuation airflow” or “weak fluctuation airflow”. For example, when “automatic fluctuation airflow” is selected, 1 is input as the correction coefficient, and the fluctuation amount does not change. On the other hand, when “fluctuating airflow weakness” is selected, 0.7 is input as a correction coefficient, and a value obtained by multiplying the entire fluctuation amount shown in FIG. 8 by 0.7 is the fluctuation amount. .

  In step S9, the control unit 40 performs fluctuation airflow control. As the fluctuation amount of the fan rotation speed of the indoor fan 14 in this fluctuation control, the fluctuation amount multiplied by the correction coefficient input in step S8 is applied.

  In step S10, the control unit 40 determines whether or not the fluctuation airflow control has been cancelled. If it has been cancelled, the control unit 40 ends this control, and if not cancelled, returns to step S6.

  For convenience of explanation, the control from step S2 to step S10 is referred to as second fluctuation airflow control.

(5-2) Steps S21 to S26
The controller 40 determines in step S2 that the air volume is not automatic (that is, the air volume is fixed), and proceeds to step S21. In step S <b> 21, the control unit 40 sets a tap when the airflow is being fixed as a reference fan rotation speed.

  In step S22, the control unit 40 determines whether or not a resident (user) has requested a fan rotation speed variation correction. If there is a variation correction request, the control unit 40 proceeds to step S23 to request a variation correction request. If not, the process proceeds to step S25.

  In step S23, the control unit 40 turns on the variation correction function for fixing the air volume, and proceeds to step S24. In step S24, the control unit 40 determines whether or not a correction coefficient is input. If the correction coefficient is input, the control unit 40 proceeds to step S25, and if not input, continues to step S24.

  For example, when “automatic fluctuation airflow” is selected, 0.5 is input as the correction coefficient, and the value obtained by multiplying the entire fluctuation amount shown in FIG. 8 by 0.5 is the fluctuation amount. . On the other hand, when “fluctuating airflow weakness” is selected, 0.3 is input as the correction coefficient, and the value obtained by multiplying the entire fluctuation amount shown in FIG. 8 by 0.3 is the fluctuation amount. .

  In step S25, the controller 40 performs fluctuation airflow control. As the fluctuation amount of the fan rotation speed of the indoor fan 14 in this fluctuation control, the fluctuation amount multiplied by the correction coefficient input in step S24 is applied.

  In step S26, the control unit 40 determines whether or not the fluctuation airflow control has been cancelled. If it has been cancelled, the control unit 40 ends this control, and if not cancelled, returns to step S22.

  For convenience of explanation, the control from step S21 to step S26 is referred to as first fluctuation airflow control.

(6) Features (6-1)
In the air conditioning indoor unit 10, the magnitude of the increase or decrease in the rotational speed of the indoor fan 14 can be changed by the first function that changes the set value of the change amount of the air volume in the fluctuation air flow control. As a result, since the acceleration of the indoor fan 14 can be suppressed, noise such as a beat noise can be suppressed accordingly.

(6-2)
Further, the control unit 40 recognizes the fluctuation airflow control selected when the airflow is fixed as the first fluctuation airflow control, and recognizes the fluctuation airflow control selected when the airflow is automatic as the second fluctuation airflow control. Since the first fluctuation airflow control is smaller than the second fluctuation airflow control, the magnitude of the airflow increase / decrease in the first fluctuation airflow control is the second fluctuation airflow control. Smaller than The fluctuation airflow control selected when the airflow is fixed, such as the first fluctuation airflow control, is performed irregularly based on the fixed airflow at that time, so if the initial fixed airflow is high The sound when the air volume is increased or decreased is also increased. Therefore, if the magnitude of increase / decrease in the air volume in the first fluctuation airflow control is set to be smaller than that in the second fluctuation airflow control, noise such as a roaring sound can be suppressed.

(7) Modification In the above embodiment, the fluctuation amount from No. 1 to No. 60 in each pattern shown in FIG. 8 is switched in order at a predetermined time (1 second), but is not limited to this. Absent.

  In the air conditioning indoor unit 10 according to the modified example, the time interval of increase / decrease of the air volume can be changed by the second function that changes the set value of the change rate of the air volume in the fluctuation air flow control. That is, by setting the predetermined time (1 second) in the above embodiment to be longer, fluctuations in the fan rotation speed of the indoor fan 14 can be smoothed.

  As a result, the number of rotations of the indoor fan 14 can be increased or decreased gradually, and noise such as a beep can be suppressed accordingly.

  For example, the rotational speed of the indoor fan 14 is gradually increased or decreased by setting the time interval (predetermined time) for increasing or decreasing the fan rotational speed in the first fluctuation airflow control to be larger than that in the second fluctuation airflow control. Therefore, it is possible to reduce the noise such as a beat sound.

  As described above, according to the present invention, conditioned air close to natural wind can be provided to the occupant, so that it is useful not only for wall-mounted air conditioning indoor units but also for air purifiers.

10 Control unit for air conditioning indoor unit 40

JP-A-8-86502

Claims (5)

An air-conditioning indoor unit comprising a control unit (40) in which fluctuation airflow control for irregularly changing the air volume of conditioned air is set to be selectable,
A selection means for selecting the fluctuation airflow control;
The control unit (40)
A first function for changing a set value of the change amount of the air volume in the fluctuation air flow control; and
A second function for changing a set value of the change rate of the air volume in the fluctuation air flow control;
One of them,
The selection means is provided with an input unit for a user to input the set value.
Air conditioning indoor unit. The control unit (40) has the first function,
The first function is a function of changing the amount of increase or decrease in the air volume.
The air conditioning indoor unit according to claim 1. The control unit (40) has the second function,
The second function is a function of changing a time interval of increase / decrease of the air volume.
The air conditioning indoor unit according to claim 1. The control unit (40)
The air volume is set to either one of the air volume fixing that fixes the air volume to one stage in a plurality of air volume ranges, or the air volume automatic that automatically controls the air volume,
The fluctuation airflow control selected when the airflow setting immediately before the fluctuation airflow control is selected is fixed as the first airflow control,
As the second fluctuation airflow control, the fluctuation airflow control selected when the airflow setting immediately before the fluctuation airflow control is selected is the airflow automatic.
Certified,
Furthermore, the said control part (40) has memorize | stored beforehand the allowable change width | variety of the magnitude | size of the increase / decrease in the said air volume,
The allowable change width is set such that the increase / decrease amount of the air volume in the first fluctuation airflow control is smaller than that in the second fluctuation airflow control.
The air conditioning indoor unit according to claim 2. The control unit (40)
The air volume is set to either one of the air volume fixing that fixes the air volume to one stage in a plurality of air volume ranges, or the air volume automatic that automatically controls the air volume,
The fluctuation airflow control selected when the airflow setting immediately before the fluctuation airflow control is selected is fixed as the first airflow control,
As the second fluctuation airflow control, the fluctuation airflow control selected when the airflow setting immediately before the fluctuation airflow control is selected is the airflow automatic.
Certified,
Furthermore, the said control part (40) has memorize | stored beforehand the allowable change width | variety of the time interval of the increase / decrease in the said air volume,
The allowable change width is set so that a time interval of increase / decrease in the air volume in the first fluctuation airflow control is larger than that in the second fluctuation airflow control.
The air conditioning indoor unit according to claim 3.

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