JP2014126335A - Air conditioner indoor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner indoor unit capable of preventing an opening/closing plate from repeatedly opening or closing a lower suction port when an air-direction setting is repeatedly made.SOLUTION: If a user changes an inclination angle θ of an air-direction adjustment blade 31 via an air-direction setting unit 451 of a remote controller 45, the changed inclination angle θ is set, and the set inclination angle θ is greater than a downward threshold angle θs, then a control unit 40 closes a lower suction port 21 via an opening/closing plate 29 and prevents generation of a short-circuit. Note however that the control unit 40 closes the lower suction port 21 via the opening/closing plate 29 after the air-direction adjustment blade 31 completes operating at the inclination angle θ.

Description

  The present invention relates to an air conditioning indoor unit.

  In recent years, air-conditioning indoor units in which a suction port is provided below or behind the air outlet have been widely introduced by publications and the like. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-116346) discloses an air conditioning indoor unit having an upper suction port on the front upper surface and upper surface of the main body and a lower suction port on the bottom surface of the main body. An opening / closing plate is rotatably attached to the lower suction port. According to Patent Document 1, the opening / closing plate fully opens the lower suction port during normal operation, and closes the lower suction port as necessary when operation is stopped or maintenance is performed.

  However, in the air conditioning indoor unit as described above, when the wind direction adjusting blade that adjusts the blowing angle of the conditioned air assumes a specific downward posture during the swing mode, the conditioned air passes directly over the wind direction adjusting blade and directly into the lower suction port. Phenomenon that is sucked into, so-called short circuit occurs, the ability is significantly reduced.

  In order to prevent this phenomenon, an air-conditioning indoor unit having a configuration in which the lower suction port is closed by the opening and closing plate when the wind direction adjusting blade is in a specific downward posture has been studied.

  However, in such an air conditioner indoor unit, until the wind direction is determined when the user sets the wind direction, the opening / closing plate is moved to the lower suction port every time the wind direction adjusting blade moves around the specific downward posture. Repeated opening and closing may cause discomfort to the user.

  The subject of this invention is providing the air-conditioning indoor unit which prevents that an opening-and-closing board repeats operation when a wind direction setting is repeated.

  An air conditioning indoor unit according to a first aspect of the present invention is a wall-mounted air conditioning indoor unit provided with at least two suction ports and a blowout port for blowing out conditioned air, and includes a main body casing, an opening / closing plate, and a wind direction An adjustment blade and a control unit are provided. The main body casing has a first suction port located below or behind the air outlet, and a second suction port located above the air outlet. The opening / closing plate opens and closes the first suction port. The wind direction adjusting blade changes the angle of inclination with respect to the horizontal plane to adjust the blowing angle of the conditioned air. The control unit is set so that the swing mode and the manual mode can be switched as the wind direction mode. The swing mode is a mode in which the wind direction adjusting blade is swung by automatically changing the inclination angle. The manual mode is a mode in which the inclination angle of the wind direction adjusting blade is maintained at an angle selected by the user. In the manual mode, the inclination angle of the wind direction adjusting blade can be selected within a predetermined angle range. Within the predetermined angle, a threshold angle is set as a threshold for the control unit to determine whether the first suction port is opened or closed. The control unit switches the first suction port to the open state or the closed state based on whether or not the inclination angle of the wind direction adjusting blade is larger than the threshold angle. Further, when the control unit determines to close or open the first suction port, the control unit performs an opening / closing operation of the first suction port by the opening / closing plate after the operation of the wind direction adjusting blade is completed.

  While the user repeats the wind direction setting by the wind direction adjusting blade, the posture (tilt angle) of the wind direction adjusting blade is not fixed. When the opening / closing plate enters an operation of closing the first suction port without determining the posture of the wind direction adjusting blade, the operation of the opening / closing plate is repeated every time the wind direction is set, which gives the user an unpleasant feeling.

  In this air conditioning indoor unit, since the opening / closing plate enters the operation of closing the first suction port after the operation of the wind direction adjusting blade is completed, unnecessary operation of the opening / closing plate is omitted, and the user's discomfort is also eliminated.

  The air conditioning indoor unit according to the second aspect of the present invention is the air conditioning indoor unit according to the first aspect, and further includes a stepping motor that drives the wind direction adjusting blade. The control unit determines whether or not the operation of the wind direction adjusting blade has been completed based on the number of pulses input to the stepping motor and / or the excitation state of the stepping motor.

  Normally, a stepping motor receives a target pulse corresponding to the position where the wind direction adjusting blade reaches the target inclination angle from the current position, so that the operation of the open / close plate is continued until the number of input pulses reaches the target pulse. Does not complete. Therefore, in this air conditioning indoor unit, the completion of the operation of the wind direction adjusting blade can be reasonably determined based on the number of input pulses to the stepping motor.

  Further, since the stepping motor is in the excited state while the pulse is being input to the stepping motor, the completion of the operation of the airflow direction adjusting blade can be reasonably determined by whether or not the stepping motor is in the excited state.

  The air conditioning indoor unit according to the third aspect of the present invention is the air conditioning indoor unit according to the first aspect or the second aspect, and the opening / closing plate closed state setting means for maintaining the first suction port closed by the opening / closing plate. Is further provided.

  In this air conditioning indoor unit, when the user feels uncomfortable opening / closing operation of the first suction port by the opening / closing plate, the user can set the first suction port closed, which is convenient for the user. .

  The air conditioning indoor unit according to the fourth aspect of the present invention is the air conditioning indoor unit according to any one of the first to third aspects, wherein the threshold angle is the first of the inclination angles of the wind direction adjusting blades. This is the lower limit angle at which the conditioned air blown out from the air outlet when the air inlet is in an open state does not cause a phenomenon in which the conditioned air is directly sucked into the first air inlet through the wind direction adjusting blade.

  In this air conditioning indoor unit, when the inclination angle of the wind direction adjusting blade is larger than the threshold angle, the first suction port is switched to the closed state, so that a so-called short circuit is prevented.

  In the air conditioning indoor unit according to the first aspect of the present invention, since the opening / closing plate enters the operation of closing the first suction port after the operation of the airflow direction adjusting blade is completed, unnecessary operation of the opening / closing plate is omitted, and the user feels uncomfortable. Is also resolved.

  In the air conditioning indoor unit pertaining to the second aspect of the present invention, the completion of the operation of the wind direction adjusting blade can be reasonably determined based on the number of input pulses to the stepping motor.

  Further, since the stepping motor is in the excited state while the pulse is being input to the stepping motor, the completion of the operation of the airflow direction adjusting blade can be reasonably determined by whether or not the stepping motor is in the excited state.

  In the air conditioning indoor unit according to the third aspect of the present invention, when the user feels uncomfortable with the opening and closing operation of the first suction port by the opening and closing plate, the user himself can set the first suction port closed. Therefore, it is convenient for users.

  In the air conditioner indoor unit according to the fourth aspect of the present invention, when the inclination angle of the wind direction adjusting blade is larger than the threshold angle, the first suction port is switched to the closed state, and so-called short circuit is prevented.

The perspective view of the air-conditioning indoor unit at the time of a driving | operation. Sectional drawing of the air-conditioning indoor unit in FIG. The control block diagram of an air-conditioning indoor unit. Sectional drawing of the periphery of a lower inlet when the downward inclination angle (theta) of a wind direction adjustment blade | wing is larger than threshold angle (theta) s. Sectional drawing of the lower suction inlet periphery when the downward inclination angle (theta) of a wind direction adjustment blade | wing is smaller than threshold angle (theta) s. The control flowchart of the opening-and-closing control of the lower inlet at the time of the wind direction setting by manual mode. The control flowchart of opening-and-closing control of the lower inlet in swing mode.

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

(1) Configuration of Air Conditioning Indoor Unit 10 FIG. 1 is a perspective view of the air conditioning indoor unit 10 during operation. FIG. 2 is a cross-sectional view of the air conditioning indoor unit 10 in FIG. 1 and 2, 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 on the air conditioning indoor unit 10.

(1-1) Main body casing 11
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 upper 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.

(1-2) Filter 24
A filter 24 is disposed between the upper suction port 12 and the indoor heat exchanger 13. The filter 24 removes dust contained in the air sucked from the upper 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.

(1-3) Indoor heat exchanger 13
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.

(1-4) Indoor fan 14
In FIG. 2, the indoor fan 14 is located below the indoor heat exchanger 13. The indoor fan 14 is a cross-flow fan, blows air taken in from the room against the indoor heat exchanger 13 and then blows it into the room. The indoor fan 14 and the indoor heat exchanger 13 are attached to the bottom frame 16.

(1-5) Vertical wind direction adjusting plate 20
As shown in FIG. 1, the vertical wind direction adjusting plate 20 is disposed on the back side of the air outlet 15 of the main body casing 11. 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.

  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 stepping motor (not shown).

(1-6) Wind direction adjusting blade 31
An air outlet 15 is provided in the lower part of the main 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 stepping motor (not shown), and can not only change the blowing direction of the conditioned air, but 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.

(1-7) Coanda blade 32
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 stepping motor (not shown), and is housed in the housing portion 130 provided on the front panel 11b when the operation is stopped. The Coanda blade 32 can take a plurality of postures having different inclination angles.

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

  The Coanda (effect) is a phenomenon in which if there is a wall near the flow of gas or liquid, even if the direction of the flow and the direction of the wall are different, they will flow in the direction along the wall surface ( Asakura Shoten "Dictionary of the Law").

(1-8) Blowing flow path 18 and suction flow path 22
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 upper 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 flow path 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.

  When the opening / closing plate 29 is in the open state, the indoor air near the lower suction port 21 is sucked into the indoor fan 14 through 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. Then, the air is blown out from the blower outlet 15 through the blowout flow path 18 from the indoor fan 14.

(1-9) Control unit 40
FIG. 3 is a control block diagram of the air conditioning indoor unit 10. In FIG. 3, the control unit 40 includes a CPU 41 and a memory 42. The control unit 40 is connected to the stepping motor 208 of the vertical wind direction adjusting plate 20, the stepping motor 318 of the wind direction adjusting blade 31, the stepping motor 328 of the Coanda blade 32, and the stepping motor 308 of the opening / closing plate 29.

  The control unit 40 transmits and receives infrared signals to and from a remote control device (hereinafter referred to as “remote controller 45”). The user can transmit commands such as wind direction setting, threshold angle setting, swing range setting, and opening / closing plate closed state setting to the control unit 40 via the remote controller 45. Therefore, the remote controller 45 is provided with a wind direction setting unit 451, a threshold angle setting unit 453, a swing range setting unit 455, and an open / close plate closed state setting unit 457.

  In the control unit 40, the operation mode of the wind direction adjusting blade 31 is set to be switchable between the swing mode and the manual mode, and can be switched by the wind direction setting unit 451. The swing mode is a mode in which the wind direction adjusting blade 31 is swung by automatically changing the inclination angle of the wind direction adjusting blade 31 with respect to the horizontal plane. The manual mode is a mode in which the inclination angle of the wind direction adjusting blade 31 with respect to the horizontal plane is maintained at an angle selected by the user.

(2) Detailed configuration (2-1) Opening / closing mechanism 30 of the lower suction port 21
FIG. 4A is a cross-sectional view around the lower inlet 21 when the downward inclination angle θ of the wind direction adjusting blade 31 is larger than the threshold angle θs. 4B is a cross-sectional view of the periphery of the lower suction port 21 when the downward inclination angle θ of the airflow direction adjusting blade 31 is smaller than the threshold angle θs.

  In FIG. 4A, an opening / closing mechanism 30 is installed in the lower suction port 21. The opening / closing mechanism 30 includes a rotary opening / closing plate 29 and a stepping motor 308 that rotates the opening / closing plate 29.

  The opening / closing plate 29 has a size that can be fitted into the opening of the lower suction port 21 to block the lower suction port 21. The rotation shaft 307 of the opening / closing plate 29 is located above both longitudinal ends of the lower suction port 21. The opening / closing plate 29 and the rotation shaft 307 are connected by a hinge link 309.

  In the closed position where the opening / closing plate 29 closes the lower suction port 21, the rotation shaft 307 is located above the opening / closing plate 29 and closer to the outlet 15 than the center in the width direction of the opening / closing plate 29. Therefore, when the rotation shaft 307 rotates 90 ° in the CW direction in FIG. 4A, the outer surface of the opening / closing plate 29 is close to the front edge of the lower suction port 21 (the edge closer to the air outlet 15). It becomes a vertical posture.

  As a result, as shown in FIG. 4B, the opening / closing plate 29 slightly protrudes vertically downward from the lower suction port 21. The projecting dimension is preferably half or less of the width direction dimension of the opening / closing plate 29. This is because, when the mounting position of the air conditioning indoor unit 10 is directly above the curtain rail, if the projecting dimension of the opening / closing plate 29 is too long, it interferes with the curtain rail.

  In this case, since the projecting dimension of the opening / closing plate 29 is short, the airflow flowing out from the blower outlet 15 in the direction of the lower suction port 21 becomes insufficient, and a short circuit may occur. Therefore, when the inclination angle θ of the wind direction adjusting blade 31 is larger than the threshold angle θs in the downward direction, a short circuit is prevented beforehand by controlling the lower suction port 21 to close. That is, the threshold angle θ can be said to be a downward limit angle that does not generate a short circuit among the inclination angles of the wind direction adjusting blades 31.

  Here, the short circuit refers to a phenomenon in which conditioned air blown from the air outlet 15 when the lower air inlet 21 is in an open state passes directly over the wind direction adjusting blade 31 and is directly sucked into the lower air inlet 21.

  In this embodiment, since the wind direction adjusting blade 31 having an arc shape in cross section is adopted, when the inclination angle of the wind direction adjusting blade 31 with respect to the horizontal plane is recognized, as shown in FIGS. 4A and 4B, the wind direction adjusting blade 31 is used. An inclination angle is defined by an angle between a straight line connecting the upper surface front end F and the upper surface rear end R of 31 and a horizontal plane.

(2-2) Wind direction setting unit 451 of remote controller 45
The wind direction setting unit 451 is configured to select either the manual mode or the swing mode as the wind direction mode. Furthermore, when the manual mode is selected, the inclination angle θ of the wind direction adjusting blade 31 can be selected within a predetermined angle range.

  For example, when the user switches the wind direction mode to the manual mode while the wind direction adjusting blade 31 is operating in the swing mode, the wind direction adjusting blade 31 stops at the inclination angle θ immediately after the switching operation, and the user sets the wind direction. Otherwise, the inclination angle θ is maintained as it is.

  Further, the wind direction can be switched in stages, and for example, five stages of wind direction can be set from upward to downward. Therefore, when the user switches the wind direction mode to the manual mode, the wind direction adjusting blade 31 stops at the inclination angle θ immediately after the switching operation, but the user selects one wind direction from the five wind directions. The setting is maintained in the wind direction.

  The threshold angle θ is set within the predetermined angle range, and is a threshold for the control unit 40 to determine whether to open or close the lower suction port 21 in order to prevent a short circuit.

(2-3) Threshold angle setting unit 453 of the remote controller 45
The control unit 40 can set a threshold angle θs that is a lower limit angle that does not generate a short circuit among the inclination angles of the wind direction adjusting blade 31 with respect to the horizontal plane, and is set by a threshold angle setting unit 453 (see FIG. 3). can do.

  The threshold angle θs may vary depending on the model of the air conditioning indoor unit 10, and is thus set when the air conditioning indoor unit 10 is shipped from the factory. Therefore, when the manufacturer side needs to change the threshold angle θs of the wind direction adjusting blade 31 due to a minor change or the like, the set value can be easily changed.

  Also, for the service person or the user side, when the threshold angle θs of the wind direction adjusting blade 31 that is set in advance depending on the installation position of the air conditioning indoor unit 10 is not appropriate, the threshold angle θs can be easily changed. Because it is possible, it is easy to use.

(2-4) Swing range setting unit 455 of the remote controller 45
Further, the control unit 40 can set the swing range in the swing mode of the wind direction adjusting blade 31, and can be set by the swing range setting unit 455.

  Since the swing range may vary depending on the model of the air conditioning indoor unit 10, the swing range is set when the air conditioning indoor unit 10 is shipped from the factory. Therefore, if the manufacturer needs to change the swing range of the wind direction adjusting blade 31 due to a minor change or the like, it can be easily changed.

  Also, for the service person or the user, if the swing range of the wind direction adjusting blade 31 set in advance by the installation position of the air conditioning indoor unit 10 is not appropriate, the swing range can be easily changed. Easy to use.

(2-5) Opening / Closing Plate Closed State Setting Unit Furthermore, the control unit 40 can set the lower suction port 21 to be always closed by the opening / closing plate 29 and sets it by the open / close plate closed state setting unit 457. be able to. For example, when the user feels uncomfortable with the opening / closing operation of the lower suction port 21 by the opening / closing plate 29, the user himself can set the lower suction port 21 closed, which is convenient for the user.

(3) Opening / closing control of lower suction port 21 (3-1) Opening / closing control of lower suction port 21 at the time of setting the wind direction in the manual mode For example, the inclination angle of the wind direction adjusting blade 31 by the user via the wind direction setting unit 451 of the remote controller 45 When θ is changed and the changed tilt angle θ is determined, if the determined tilt angle θ is downward and larger than the threshold angle θs, the control unit 40 opens the lower suction port 21 via the opening / closing plate 29. Close to prevent the occurrence of a short circuit.

  Conversely, when the user changes the tilt angle θ of the wind direction adjusting blade 31 via the wind direction setting unit 451 of the remote controller 45 and determines the changed tilt angle θ, the determined tilt angle θ is greater than the threshold angle θs. When it becomes smaller, the control unit 40 determines that there is no short circuit and opens the closed lower suction port 21.

  However, the control unit 40 opens and closes the lower suction port 21 via the opening / closing plate 29 after the operation of the wind direction adjusting blade 31 is completed. This is because, while the user repeats the setting of the wind direction by the wind direction adjusting blade 31, the attitude (inclination angle) of the wind direction adjusting blade 31 is not fixed, and the opening / closing plate 29 is not fixed without determining the attitude of the wind direction adjusting blade 31. This is because when the opening / closing operation of the lower suction port 21 is started, the operation of the opening / closing plate 29 is repeated every time the wind direction is set, which gives the user an unpleasant feeling.

  However, since the opening / closing plate 29 enters the lower suction port 21 after the operation of the airflow direction adjusting blade 31 is completed, unnecessary operations of the opening / closing plate 29 are omitted, and the user's discomfort is also eliminated. The above control will be described below with reference to the flowchart.

  FIG. 5 is a control flowchart of the opening / closing control of the lower suction port 21 when the wind direction is set in the manual mode. In FIG. 5, the control unit 40 determines whether or not there is a manual mode wind direction setting command in step S1, proceeds to step S2 if there is such a command, waits if there is no such command, Continue to determine whether there is a command.

  Next, the control unit 40 determines whether or not the operation of the wind direction adjusting blade 31 has been completed in step S2, and when determining that the operation of the wind direction adjusting blade 31 has been completed, the control unit 40 proceeds to step S3 and adjusts the wind direction. When it is determined that the operation of the blade 31 is not completed, the process waits and continues to determine whether or not the operation of the wind direction adjusting blade 31 is completed.

  Here, the control unit 40 determines whether the operation of the wind direction adjusting blade 31 is completed based on the number of pulses input to the stepping motor 318 and / or the excitation state of the stepping motor 318. Since the target pulse corresponding to the position where the wind direction adjusting blade 31 reaches the target inclination angle θ is input to the stepping motor 318, the wind direction adjusting blade is used until the number of input pulses reaches the target pulse. 31 operation is not completed. Therefore, the completion of the operation of the wind direction adjusting blade 31 can be reasonably determined based on the number of input pulses to the stepping motor 318.

  Further, since the stepping motor 318 is in an excited state while the pulse is input to the stepping motor 318, the completion of the operation of the wind direction adjusting blade 31 can be reasonably determined by whether or not the stepping motor 318 is in the excited state.

  The control unit 40 determines whether or not the inclination angle θ of the wind direction adjusting blade 31 exceeds the threshold angle θs in step S3, and determines that the inclination angle θ exceeds the threshold angle θs, step S4. When it is determined that the inclination angle θ does not exceed the threshold angle θs, the process proceeds to step S5.

  The controller 40 closes the lower suction port 21 via the opening / closing plate 29 in step S4. As a result, it is possible to prevent the user from feeling uncomfortable by repeating the operation of the opening / closing plate 29 every time the wind direction is set without determining the attitude of the wind direction adjusting blade 31.

  When the control unit 40 determines in step S3 that “the inclination angle θ does not exceed the threshold angle θs” and proceeds to step S5, the lower suction port 21 is opened via the opening / closing plate 29 in step S5. Alternatively, if it is open from the beginning, it remains open. This is because the inclination angle θ of the wind direction adjusting blade 31 does not become larger than the threshold angle θs, so that a short circuit does not occur even if the lower suction port 21 is kept open.

(3-2) Opening / Closing Control of Lower Suction Port 21 in Swing Mode In swing mode, the inclination angle θ of the wind direction adjusting blade 31 is larger or smaller than the threshold angle θs. When the air inlet 21 is opened and closed, there is a concern that not only visual discomfort is given to the user, but also auditory discomfort due to sound during operation of the opening and closing plate 29 is caused.

  Therefore, in the present embodiment, when the user sets the swing mode via the wind direction setting unit 451 of the remote controller 45, when the position where the inclination angle θ of the wind direction adjusting blade 31 becomes the threshold angle θs is in the swing range, The control unit 40 closes the lower suction port 21 through the opening / closing plate 29 after detecting a fixed or stable swing operation of the wind direction adjusting blade 31 and then executes a normal swing mode. Hereinafter, the details will be described using a flowchart.

  FIG. 6 is a control flowchart of the opening / closing control of the lower suction port 21 in the swing mode. In FIG. 6, the control unit 40 determines “whether there is a swing mode setting command” in step S <b> 11. When there is a swing mode setting command, the control unit 40 proceeds to step S <b> 12, and when there is no swing mode setting command. Waits and continues to determine whether or not there is a swing mode setting command.

  Next, the control unit 40 determines whether or not “the threshold position (the position where the inclination angle θ of the wind direction adjusting blade 31 becomes the threshold angle θs) is within the swing range (swing range)” in Step S12. When the threshold position is within the swing range, the process proceeds to step S13, and when the threshold position is not within the swing range, the process proceeds to step S14.

  The controller 40 closes the lower suction port 21 via the opening / closing plate 29 in step S13. As a result, even if the inclination angle θ of the wind direction adjusting blade 31 becomes larger or smaller than the threshold angle θs, the opening / closing plate 29 does not open and close the lower suction port 21 each time, so that the user is visually injured. There is no pleasure or auditory discomfort.

  If the control unit 40 determines that “the threshold position is not within the swing range” in step S12 and proceeds to step S14, the lower suction port 21 is opened via the opening / closing plate 29 in step S14, or from the beginning. If it is open, it remains open. This is because the inclination angle θ of the wind direction adjusting blade 31 does not become larger than the threshold angle θs, so that a short circuit does not occur even if the lower suction port 21 is kept open.

  Finally, the control unit 40 executes the swing mode in step S15.

(4) Specific example of open / close control of lower suction port 21 (4-1) Specific example A
For example, there is furniture below the installation position of the air conditioning indoor unit 10, the direction of the conditioned air blown out is deflected by the furniture, and the short circuit before the wind direction adjusting blade 31 reaches the preset threshold angle θs. In such a case, it is not appropriate to maintain the threshold angle θs as it is. In such a case, the service person can set the threshold angle θs to a value smaller than the initial setting knowledge via the threshold angle setting unit 453. Therefore, the wind direction adjusting blades 31 at the threshold angle θs after the change are upward as compared with those before the change.

  After installing the air conditioning indoor unit 10, the user sets the inclination angle θ of the airflow direction adjusting blade 31 to be larger than the changed threshold angle θs in the manual mode without knowing anything, and the direction of the conditioned air blown out is deflected by the furniture. Even if a short circuit is likely to occur, the control unit 40 closes the lower suction port 21 via the opening / closing plate 29 by performing the control in steps S1 to S5, so that the occurrence of a short circuit is avoided. The

  On the other hand, as a result of the change of the threshold angle θs, the threshold position (position where the inclination angle θ of the wind direction adjusting blade 31 becomes the threshold angle θs) was not within the swing range of the swing mode of the wind direction adjusting blade 31 before the change. On the other hand, after the change, the threshold position falls within the swing range of the wind direction adjusting blade 31, and the lower suction port 21 remains open even though the wind direction adjusting blade 31 faces downward beyond the threshold position. An inconvenient situation is assumed.

  However, by performing the control in steps S11 to S15, when the control unit 40 is in the swing range of the wind direction adjusting blade 31 in the swing mode, the lower suction port 21 is opened via the opening / closing plate 29. close up. As a result, the above disadvantageous situation is avoided.

(4-2) Specific example B
For example, since the installation position of the air conditioning indoor unit 10 is higher than the standard, the conditioned air does not reach a wide range from the lower side of the air conditioning indoor unit 10 to the front lower side in the swing range of the wind direction adjusting blade 31 set in advance. In such a case, it is not appropriate to maintain the swing range as it is. In such a case, the service person can set the swing range wider than the initial setting knowledge via the swing range setting unit 455, that is, set larger downward.

  On the other hand, as the influence of the change of the swing range, the threshold position was not within the swing range of the wind direction adjusting blade 31 before the change, whereas the threshold position was within the swing range of the wind direction adjusting blade 31 after the change. Therefore, an inconvenient situation is assumed in which the lower suction port 21 remains open even though the wind direction adjusting blade 31 faces downward beyond the threshold position.

  However, by performing the control in steps S11 to S15, when the control unit 40 is in the swing range of the wind direction adjusting blade 31 in the swing mode, the lower suction port 21 is opened via the opening / closing plate 29. close up. As a result, the above disadvantageous situation is avoided.

(5) Features (5-1)
In the air conditioning indoor unit 10, since the opening / closing plate 29 enters the operation of closing the lower suction port 21 after the operation of the airflow direction adjusting blade 31 is completed, unnecessary operations of the opening / closing plate 29 are omitted, so that user discomfort is also eliminated. The

(5-2)
Completion of the operation of the wind direction adjusting blade 31 is determined based on the number of input pulses to the stepping motor 318. While the pulse is being input to the stepping motor 318, the stepping motor 318 is in an excited state, and the operation of the wind direction adjusting blade 31 is completed depending on whether or not the stepping motor 318 is in an excited state. Judgment can be made.

(5-3)
When the user feels uncomfortable with the opening / closing operation of the lower suction port 21 by the opening / closing plate 29, the user himself can set the lower suction port 21 to be closed via the opening / closing plate closed state setting unit 457. Therefore, it is convenient for users.

  As described above, the present invention is useful for an air-conditioning indoor unit having a plurality of suction ports, and at least one suction port is provided below or behind the outlet.

10 Air Conditioning Indoor Unit 11 Casing 12 Upper Suction Port (Second Suction Port)
21 Lower inlet (first inlet)
29 Opening / closing plate 31 Wind direction adjusting blade 40 Control unit 457 Opening / closing plate closed state setting unit (opening / closing plate closed state setting means)

JP 2001-116346 A

Claims (4)

A wall-mounted air conditioning indoor unit provided with at least two suction ports and a blow-out port for blowing out conditioned air,
A main body casing (11) having a first suction port (21) positioned below or behind the outlet and a second suction port (12) positioned above the outlet;
An opening and closing plate (29) for opening and closing the first suction port (21);
A wind direction adjusting blade (31) that adjusts the blowing angle of the conditioned air by changing an inclination angle with respect to a horizontal plane;
As a wind direction mode, a swing mode in which the wind direction adjusting blade (31) is swung by automatically changing the tilt angle, and the tilt angle of the wind direction adjusting blade (31) is maintained at an angle selected by a user. A control unit (40) which is set to be switchable between manual mode,
With
In the manual mode, the inclination angle of the wind direction adjusting blade (31) can be selected within a predetermined angle range,
Within the predetermined angle, a threshold angle is set as a threshold for the control unit (40) to determine whether to open or close the first suction port (21),
The controller (40) opens the first suction port (21) in one of an open state and a closed state based on whether the inclination angle of the wind direction adjusting blade (31) is larger than the threshold angle. Switch to
Further, when the control unit (40) decides to close or open the first suction port (21), the controller (40) uses the opening / closing plate (29) after the operation of the wind direction adjusting blade (31) is completed. Opening and closing the first suction port (21);
Air conditioning indoor unit (10). A stepping motor for driving the wind direction adjusting blade (31);
The controller (40) determines whether or not the operation of the wind direction adjusting blade (31) is completed based on the number of pulses input to the stepping motor and / or the excitation state of the stepping motor.
The air conditioning indoor unit (10) according to claim 1. Further comprising an opening / closing plate closed state setting means (457) for maintaining the first suction port (21) always closed by the opening / closing plate (29).
The air conditioning indoor unit (10) according to claim 1 or 2. The threshold angle is equal to the inclination angle of the wind direction adjusting blade (31), and the conditioned air blown out from the outlet when the first suction port (21) is in the open state is the wind direction adjusting blade (31). ) Exceeding the lower limit angle that does not cause a phenomenon of being directly sucked into the first suction port (21).
The air conditioning indoor unit (10) according to any one of claims 1 to 3.

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