JP5723734B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner equipped with a human detection function, and more particularly to an air conditioner that changes operation according to the presence or absence of a person in the room.

  When the user leaves the air-conditioned room while the air conditioner is in operation, useless operation continues and wasteful power is consumed. In response to this problem, the air conditioner is equipped with a human detection sensor that detects the presence or absence of a room occupant, and shifts to save operation when it detects absence for a certain period of time. A method has been proposed.

  In Patent Document 1, when the detected object cannot be detected by the detected object detection unit for a set time, the set value of the remote control is changed to save the operation, and after the operation is set to the save state, the detected object is detected. When the detection cannot be continued for a set time, the operation of the air conditioner is stopped. Furthermore, an air conditioner is disclosed that performs a notification sound and a notification display when the operation is set to the save state and when the operation is stopped, prompts the user to move, and increases the accuracy of the human detection sensor.

JP 2000-74452 A

  In Patent Document 1, since a notification sound and a notification display are performed when shifting to the save state and the stop state, consideration for the activities of the occupants (for example, watching TV / radio, listening to music) is not sufficient.

  An object of the present invention is to provide an air conditioner with improved accuracy for determining the presence or absence of an occupant without hindering the activities of the occupant.

  The problems to be solved by the present invention are a housing having an air inlet and an air outlet, a heat exchanger disposed in the housing, and sucking indoor air from the air inlet, and the heat exchanger. A fan that blows out from the air outlet, an infrared detector that detects a person in the room, and a voice detector that detects the sound in the room, and the infrared detector during operation of the air conditioner When the apparatus does not detect a person in the room for a set time, the rotation speed of the blower fan is decreased, and after the rotation speed of the blower fan is decreased, the sound detection apparatus is caused to detect the sound in the room, and the sound detection is performed. When the device detects an occupant, the rotation speed of the blower fan is increased, and when the sound detection device does not detect the occupant, the operation of the air conditioner is stopped.

  An air conditioner with improved accuracy for determining the presence or absence of a occupant can be provided without hindering the activities of the occupant.

It is a block diagram of the air conditioner of an Example. It is sectional drawing of the indoor unit of the air conditioner. It is sectional drawing of the outdoor unit of the air conditioner. It is a refrigerant circuit diagram of the air conditioner. It is an external appearance perspective view of the indoor unit. It is the external appearance perspective view which opened the up-and-down wind direction board of the indoor unit. It is an operation | movement procedure flowchart of the air conditioner. It is an operation | movement procedure flowchart of the air conditioner. It is an operation | movement procedure flowchart of the air conditioner.

  Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals in the drawings indicate the same or equivalent.

  First, the whole structure of an air conditioner is demonstrated using FIGS. FIG. 1 is a configuration diagram of an air conditioner according to an embodiment. FIG. 2 is a sectional view of the indoor unit of the air conditioner. FIG. 3 is a sectional view of the outdoor unit of the air conditioner. FIG. 4 is a refrigerant circuit diagram of the air conditioner, (a) is a diagram showing the flow direction of the refrigerant during the cooling / dehumidification operation, and (b) is a diagram showing the flow direction of the refrigerant during the heating operation. FIG. 5 is an external perspective view of the indoor unit. FIG. 6 is an external perspective view of the indoor unit with the up-and-down wind direction plate opened.

  The air conditioner 1 connects the indoor unit 2 and the outdoor unit 6 with a connection pipe 8 to air-condition the room. In the indoor unit 2, an indoor heat exchanger 33 is placed at the center of the housing base 21, and a cross-flow fan type indoor fan 311 having a length substantially equal to the width of the indoor heat exchanger 33 is disposed downstream of the indoor heat exchanger 33. The dew tray 35 and the like are attached, these are covered with the decorative frame 23, and the front panel 25 is attached to the front surface of the decorative frame 23. The decorative frame 23 is provided with an air inlet 27 for sucking in indoor air and an air outlet 29 for blowing air with adjusted temperature and humidity. An indoor blower 311 is provided downstream of the air flow of the indoor heat exchanger 33, and when the indoor blower 311 rotates, indoor air passes through the indoor heat exchanger 33 and the indoor blower 311 from the air inlet 27 provided in the indoor unit 2. Then, the air flows in a blowout air passage 290 having a width substantially equal to the length of the indoor blower 311, and the left and right airflow direction plates 295 arranged in the middle of the blowout air passage 290 are deflected in the left-right direction of the airflow, and further arranged in the air blowout port 29. The vertical airflow direction plates 291 and 292 deflect the airflow in the vertical direction and blow it out indoors.

  Basic internal structures such as an indoor blower 311, filters 231 and 231 ′, an indoor heat exchanger 33, a dew tray 35, vertical wind direction plates 291 and 292, and left and right wind direction plates 295 are attached to the housing base 21. These basic internal structures are included in a casing 20 including a casing base 21, a decorative frame 23, and a front panel 25, and constitute the indoor unit 2.

  The outdoor unit 6 includes a base 61 on which a compressor 75, an outdoor heat exchanger 73, and the like are mounted. The outdoor unit 6 is covered with an outer box 62. The outdoor fan 63 causes the outside air to flow to the outdoor heat exchanger 73 and exchanges heat with the refrigerant flowing inside. Then, the air is blown out through the blower cover 635.

  At the time of cooling / dehumidifying operation, as shown in FIG. 4A, the refrigerant is converted into a compressor 75, a refrigerant flow path switching valve 72, an outdoor heat exchanger 73, a cooling / heating throttle device 74, a dehumidifying heater 332, a dehumidifying throttle device 34, and dehumidifying cooling. 333 and the refrigerant flow switching valve 72 are flowed in this order and returned to the compressor 75, and the cooling / dehumidifying throttle device 74 and the dehumidifying throttle device 34 are appropriately throttled or opened in accordance with the cooling / dehumidifying operation to control the refrigerant. 75, the outdoor blower 63 and the indoor blower 311 are operated at an appropriate number of revolutions to perform a known cooling / dehumidifying operation.

  Further, during the heating operation, as shown in FIG. 4B, the refrigerant flow path switching valve 72 is switched to flow the refrigerant in the reverse direction, and the well-known heating operation is similarly performed.

  In addition, on the lower right side of the front panel 25, a display device 397 for displaying an operation status and a light receiving unit 396 for receiving an infrared operation signal from a separate remote controller 5 are arranged.

  An air outlet 29 formed on the lower surface of the decorative frame 23 is disposed adjacent to the divided portion with the front panel 25 and communicates with the rear outlet air passage 290. The two up-and-down air direction plates 291 and 292 are configured to have a large curved surface continuous with the bottom surface of the indoor unit 2 while substantially concealing the blowing air passage 290 in a closed state. These up-and-down wind direction plates 291 and 292 are rotated by a drive motor when the air conditioner 1 is operated in response to an instruction from the remote controller 5 with the rotation shafts provided at both ends as fulcrums. Open and hold in that state. When the operation of the air conditioner 1 is stopped, the up-and-down air direction plates 291 and 292 are controlled so as to close the air outlet 29.

  The left and right wind direction plates 295 are rotated by a drive motor with a rotation shaft provided at the lower end portion as a fulcrum, and are rotated in accordance with an instruction from the remote controller 5 and held in that state. As a result, the blown air is blown out in the left and right desired directions. In addition, by instructing from the remote controller 5, the up and down wind direction plates 291 and 292 and the left and right wind direction plates 295 are periodically oscillated during the operation of the air conditioner 1, and the blown air is periodically sent over a wide range in the room. it can.

  The movable panel 251 is configured to be rotated by a drive motor with a rotation shaft provided at a lower portion as a fulcrum, and to open the front air suction portion 230 ′ when the air conditioner 1 is operated. As a result, the indoor air is also sucked into the indoor unit 2 from the front air suction portion 230 'during operation. When the air conditioner 1 is stopped, the front air suction portion 230 ′ is controlled to be closed.

  The indoor unit 2 includes a control board in an internal electrical component box, and a microcomputer is provided on the control board. The microcomputer receives signals from various sensors such as an indoor temperature sensor and an indoor humidity sensor, and also receives an operation signal from the remote controller 5 via the light receiving unit 396. Based on these signals, the microcomputer controls the indoor blower 311, the movable panel drive motor, the up / down wind direction plate drive motor, the left / right wind direction plate drive motor, and the like, and controls the communication with the outdoor unit 6. Control all over.

  The filters 231 and 231 ′ are for removing dust contained in the sucked indoor air, and are arranged so as to cover the suction side of the indoor heat exchanger 33. The dew tray 35 is disposed below the lower ends of the front and rear sides of the indoor heat exchanger 33, and is provided to receive condensed water generated in the indoor heat exchanger 33 during cooling operation or dehumidifying operation. The condensed water received and collected is discharged to the outside through the drain pipe 37.

  The infrared detecting device 14 and the sound detecting device 17 are provided at the center in the longitudinal direction of the blowout air channel upper enlarged portion 290e so that the interior can be detected as shown in FIG. 6 during operation, and the upper side as shown in FIG. 5 when operation is stopped. The vertical wind direction plate 291 is shielded from the room so as not to give the room a sense of incongruity.

  The infrared detector 14 detects the movement of a part of the body such as the user's hand, leg, face, and sends a detection signal to the microcomputer. The microcomputer can know the presence or absence of a room occupant by processing this signal. Thereby, according to the presence or absence of a room occupant, for example, if it is absent, driving can be saved or stopped, and energy saving and convenience can be improved.

  The sound detection device 17 detects the sound in the room and sends a detection signal to the microcomputer. The microcomputer can know the sound condition in the room by processing this signal. For example, it is possible to detect conversations such as operating sound of an air conditioner, motor sound of a vacuum cleaner, TV or radio.

  In the embodiment, a pyroelectric infrared sensor is used as the infrared detecting device 14, and a microphone is used as the sound detecting device 17.

  Next, a method for controlling the operation of the air conditioner according to the presence or absence of a room occupant will be described using the flowcharts of FIGS. FIG. 7 is a flowchart from normal operation to save operation. FIG. 8 is a flowchart from a save operation to a temporary determination of operation stop. FIG. 9 is a flowchart from the temporary determination of the operation stop to the operation stop.

  When the air conditioner 1 is in operation, it is first determined whether or not the user intends to stop the operation, that is, whether or not the off timer is set (Step 1), and the off timer is set. For example, the user's intention is respected and the operation is continued as it is (Step 2).

  Subsequently, a counter is initialized (Step 3), and the presence or absence of a detection object (such as a user) is determined by the infrared detection device 14 (Step 4). When the detected object is not detected, the counter is advanced by 1 (Step 5), it is determined whether the counter is equal to or greater than the threshold value 1 (Step 6), and Steps 4 to 6 are repeated until the counter reaches the threshold value 1 or more. That is, the infrared detection device 14 monitors the detected object until the counter reaches the threshold value 1 or more. When the detected object is detected by the infrared detecting device 14 until the counter reaches the threshold value 1 or more, the process returns to Step 3 to initialize the counter, and the detection of the detected object by the infrared detecting device 14 is resumed.

  Thus, if the detected object is detected indoors until the threshold value 1 is reached, normal operation is continued, so that indoor comfort is maintained. In the embodiment, the threshold value 1 is set to 30 minutes, but the threshold value 1 may be set by the user using the remote controller 5, for example. The threshold 1 may be a predetermined number of times instead of a predetermined time.

  When the counter reaches the threshold value 1 or more, the process proceeds to Step 7 to perform the save operation. For example, in the cooling operation, the save operation is an operation that saves energy by controlling the room temperature so that the target temperature is increased several degrees with respect to the set temperature of the remote controller 5. That is, when it can be determined that there is no object to be detected in the room during the threshold 1, energy saving can be improved by performing the minimum necessary operation.

  At the same time as the save operation is started, the counter is initialized (Step 8), and the detection of the detected object is resumed by the infrared detecting device 14 (Step 9). When the detected object is not detected, the counter is advanced by 1 (Step 10), it is determined whether the counter is equal to or greater than the threshold 2 (Step 11), and Steps 9 to 11 are repeated until the counter reaches the threshold 2 or more. That is, the object to be detected is monitored by the infrared detecting device 14 until the counter reaches the threshold value 2 or more. When the detected object is detected by the infrared detecting device 14 before the counter reaches the threshold value 2 or more, the operation is performed according to the setting of the remote controller 5 (Step 12), and the process returns to Step 3. That is, the save operation is canceled, the air conditioner set temperature is set to the set temperature before the save operation is performed, the normal operation is restored, the counter is initialized, and the detection of the detected object by the infrared detector 14 is resumed. To do. When returning to normal operation, the set temperature of the air conditioner may not be necessarily set to the set temperature before performing the save operation, but may be changed to another set temperature.

  Thus, if the detected object is detected indoors until the threshold value 2 is reached, the indoor comfort can be quickly returned by returning from the save operation to the normal operation. Thereby, it is possible to achieve both energy saving and comfort when the user moves from the room and then returns. In the embodiment, the threshold value 2 is set to 110 minutes. However, the threshold value 2 may be set by the user using the remote controller 5, for example.

  When the counter reaches the threshold value 2 or more, a final confirmation for stopping the operation is performed. This is because even if the user or the like is in the room, it may not be detected because there is no movement or there is no difference between the ambient temperature and the user's temperature. Therefore, in this final confirmation, the sound detection device 17 detects the sound information in the room in addition to the infrared detection device 14, and the infrared detection device 14 cannot detect the detection target. It is possible to determine whether it was because the user was not in the room or because it was not detected for some reason. By doing so, it is possible to prevent the comfort from deteriorating by stopping the operation of the air conditioner even though the user is in the room.

  In the final confirmation, first, the detected object is detected by the infrared detecting device 14 (Step 13). When the object to be detected is not detected, the wind speed is minimized in order to increase the detection capability of the sound detection device 17 (Step 14). Specifically, the wind speed is lowered so that the rotational sound of the blower fan detected by the voice detection sensor is 50 dB or less. Subsequently, the voice detection device 17 detects the voice information in the room (Step 15). When the detection result is only the operation sound of the air conditioner, it is determined that the user is not in the room and the operation of the air conditioner is stopped. As a result, when the user does not return after leaving the room for a long time, the operation of the air conditioner is stopped, so that only standby power is required and significant energy saving can be achieved.

  If the detection result of the voice detection device 17 is, for example, a motor sound from a vacuum cleaner, TV, radio, or conversation, there is a high possibility that there is a user. I do. For that purpose, the wind speed once changed at Step 14 is returned to the original rotation speed before changing, and the save operation is performed for a predetermined time (Step 16). In the embodiment, the set time is 30 minutes. In addition to returning to the original rotation speed before changing the wind speed once changed at Step 14, the wind speed changed at Step 14 may be increased to another rotation speed.

  The air conditioner stores in advance main frequencies in the operation sound of the air conditioner, the voice of the user, the motor sound of the cleaner, and the like. Here, the calculation which extracts the predetermined frequency range corresponding to the driving | running sound of an air conditioner, a user's voice | voice, the motor sound of a cleaner, etc. from the value detected with the audio | voice detection apparatus 17 is performed. And when the detection result of the audio | voice detection apparatus 17 detects only the audio | voice data in the frequency range in the driving | running | working sound of an air conditioner, it determines that the user is not indoors. That is, the sound detection device 17 specifies the frequency range of the operation sound of the air conditioner, and the sound information detected by the sound detection device 17 includes sound information other than the frequency range of the operation sound of the air conditioner. If the sound information detected by the sound detection device 17 does not include sound information other than the frequency range of the operation sound of the air conditioner, it is determined that there is no person in the room. To do.

  After performing the save operation for a set time, detection is performed by the infrared detection device 14 and the voice detection device 17 as in Step 13 to Step 15 (Step 17 to Step 19). When the detection object cannot be detected by the infrared detection device 14 and the detection result of the sound detection device 17 is only the operation sound of the air conditioner, it is determined that the user is not in the room and the air conditioner is operated. To stop. Although the object to be detected could not be detected by the infrared detecting device 14, but the detection result of the sound detecting device 17 is not only the operation sound of the air conditioner, there is a high possibility that there is a user. Confirm. In the re-check, the save operation is performed for the set time in the same manner as in Step 16 to Step 17, and the detection is performed by the infrared detector 14 (Step 20 to Step 21). In the embodiment, the set time is 30 minutes.

  Even in Step 21, when the object to be detected cannot be detected by the infrared detection device 14, even if it is not only the operation sound of the air conditioner in Step 15 and Step 19, these are not related to the user such as outdoor noise. Judge that it was voice information and stop the operation of the air conditioner.

  When the detected object is detected by the infrared detector 14 in Step 13, Step 17, and Step 21, the operation is performed according to the setting of the remote controller 5 (Step 22), and the process returns to Step 3. That is, the save operation is canceled, the operation returns to the normal operation, the counter is initialized, and the detection of the detection object by the infrared detection device 14 is resumed. By returning from the save operation to the normal operation, the comfort in the room can be quickly returned. This makes it possible to achieve both comfort and energy saving when the user moves from the room and then returns.

  Here, the detection by the voice detection device 17 has been described only in Step 15 and Step 19, but the detection by the voice detection device 17 may be performed in another Step. However, the indoor blower 311 is close to the place where the sound detection device 17 is installed, and the operation sound of the indoor blower 311 is easily detected by the sound detection device 17. Therefore, when the detection by the sound detection device 17 is performed, it is necessary to reduce the rotation speed of the indoor blower 311 in order to increase the detection capability of the sound detection device 17. That is, in accordance with the detection by the voice detection device 17, the air volume is reduced, so that the user's comfort may be impaired. Therefore, when the user is not detected by the infrared detection device 14 and the possibility that the user is present in the room is low, detection is performed by the voice detection device 17 for the first time, so that the user is present in the room. When it is, the possibility of reducing the air volume can be lowered.

  Therefore, the infrared detection device 14 that detects the occupant and the sound detection device 17 that detects the sound in the room are provided, and the infrared detection device 14 does not detect the occupant for the set time during the operation of the air conditioner. When the number of rotations of the indoor blower 311 is lowered and the number of rotations of the indoor blower 311 is lowered, the sound detection device 17 detects the sound in the room, and when the sound detection device 17 detects the occupant, When the number of rotations of the indoor blower 311 is increased and the voice detection device 17 does not detect the occupant, the operation of the air blower is stopped by reducing the operation sound of the indoor blower 311 and then the voice detection device 17 is stopped. Since the sound in the room is detected, the accuracy of detecting the occupant is increased. In addition, since the rotation speed of the indoor blower 311 is decreased only when the infrared detection device 14 does not detect the occupant for the set time, the probability that the rotation speed of the indoor blower 311 is decreased in the state where the occupant is present may be reduced. Yes, without compromising the comfort of the occupants.

  Here, during the operation of the air conditioner, when the infrared detection device 14 does not detect a person in the room for a set time, the rotation speed of the indoor blower 311 is lowered to the lowest rotation speed that can be set during normal operation. Note that the number of rotations that can be set during normal operation is, for example, the number of rotations corresponding to strong winds, medium winds, weak winds, and light winds. In this case, the minimum number of rotations that can be set during normal operation is a slight wind.

  In addition, the voice detection control can increase the accuracy of determining the presence or absence of a room occupant by setting the rotation speed of the indoor blower 13 to a rotation speed at which the operation sound of the air conditioner is 50 dB or less.

  Further, when the voice detection device detects the occupant, the rotational speed of the blower fan is returned to the rotational speed before the rotational speed of the blower fan is lowered.

  Moreover, the housing | casing which has an air suction inlet and an air blowing outlet, the heat exchanger arrange | positioned in a housing | casing, the indoor air blower 311 which sucks indoor air from an air suction opening, and blows off from an air blowing opening, Left and right wind direction plates provided in the blowout air passage, up and down air direction plates provided in the blowout air passage of the indoor blower 311, an infrared detection device 14 that detects a person in the room, and a sound detection device 17 that detects the sound in the room, When the infrared detector 14 does not detect a resident in the first predetermined time during the operation of the air conditioner, the set temperature of the air conditioner is changed and the save operation is performed for the second set time. If the infrared detection device 14 detects a resident in the save operation, the save operation is returned to the normal operation. If the infrared detection device 14 does not detect the occupant in the save operation, the indoor blower 311 rotates. Lower the number In addition, when the sound detection device 17 detects the sound in the room after the rotation speed of the indoor blower 311 is lowered, and the sound detection device 17 detects a resident, the rotation speed of the indoor blower 311 is increased and saved. After the operation is completed, the save operation is further performed for the third set time, and when the voice detection device 17 does not detect the occupant, the operation of the occupant is inhibited by stopping the operation of the air conditioner. The accuracy of determining the presence or absence of occupants can be improved, and comfortable driving and energy-saving driving can be performed automatically.

  Further, when the save operation is repeated a predetermined number of times, even if the sound detection device 17 detects a sound other than the operation sound of the air conditioner, the presence or absence of the occupant is stopped by stopping the operation of the air conditioner. By performing the detection operation a plurality of times in the final confirmation, it is possible to automatically perform comfortable driving and energy-saving driving according to the presence or absence of an occupant while preventing operation stop due to erroneous detection.

  The voice detection device 17 specifies the frequency range of the operation sound of the air conditioner, and the sound information detected by the voice detection device 17 includes sound information other than the frequency range of the operation sound of the air conditioner. When it is determined that there is a person in the room and the sound information detected by the sound detection device 17 does not include sound information other than the frequency range of the operation sound of the air conditioner, it is determined that there is no person in the room. Thus, the presence or absence of a person in the room can be determined with higher accuracy from the sound information detected by the voice detection device. In addition, since the sound based on the airflow which blows off from the indoor air blower 13 is dominant in the operation sound of an air conditioner, the frequency range of the sound based on the airflow which blows off from the indoor air blower 13 is specified beforehand, and the audio | voice detection apparatus 17 detects. It is also possible to analyze whether or not the sound information includes sound information other than the sound frequency range based on the airflow blown out from the indoor blower 13.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 5 Remote control 6 Outdoor unit 8 Connection piping 14 Infrared detection device 17 Voice detection device 20 Case 21 Case base 23 Cosmetic frame 25 Front panel 27 Air inlet 29 Air outlet 33 Indoor heat exchanger 34 Dehumidifying throttling device 35 Dew tray 37 Drain pipe 61 Base 62 Outer box 63 Outdoor fan 72 Refrigerant flow path switching valve 73 Outdoor heat exchanger 74 Air-conditioning throttling device 75 Compressor 230, 230 'Air suction part 231, 231' Filter 251 Movable panel 290 Air outlet 290a Air outlet upper wall 290b Air outlet lower wall 290e Air outlet upper enlarged portion 291 Upper vertical wind direction plate 292 Lower vertical air direction plate 295 Left and right air direction plate 311 Indoor blower 332 Dehumidification heater 333 Dehumidification cooler 396 Part 397 Display device 635 Blower cover

Claims (7)

A housing having an air inlet and an air outlet;
A heat exchanger disposed in the housing;
A blower fan that sucks in indoor air from the air suction port, and blows out the air blowing port through the heat exchanger;
An infrared detection device for detecting occupants;
A voice detection device for detecting the sound in the room,
When the infrared detection device does not detect a person in the room for a set time during the operation of the air conditioner, the rotational speed of the blower fan is lowered, and after the rotational speed of the blower fan is lowered, the voice detection device Detecting the sound in the room,
When the voice detection device detects a occupant, increase the rotational speed of the blower fan,
An air conditioner that stops the operation of the air conditioner when the voice detection device does not detect an occupant.   When the infrared detection device does not detect the occupant for the set time during the operation of the air conditioner, the rotational speed of the blower fan is reduced to a minimum rotational speed that can be set during normal operation. Item 2. An air conditioner according to Item 1.   During operation of the air conditioner, when the infrared detection device does not detect the occupant for the set time, the operation sound of the air conditioner detected by the sound detection device is 50 dB or less. The air conditioner according to claim 1, wherein the rotation speed is set to   4. The system according to claim 1, wherein when the voice detection device detects a person in the room, the rotational speed of the blower fan is returned to the rotational speed before the rotational speed of the blower fan is decreased. The air conditioner described. A housing having an air inlet and an air outlet;
A heat exchanger disposed in the housing;
A blower fan that sucks in indoor air from the air suction port, and blows out the air blowing port through the heat exchanger;
An infrared detection device for detecting occupants;
A voice detection device for detecting the sound in the room,
If the infrared detection device does not detect a resident in the first set time during the operation of the air conditioner, the set temperature of the air conditioner is changed and the save operation is performed for the second set time,
If the infrared detector detects a occupant during the save operation, return the save operation to normal operation,
If the infrared detection device does not detect a occupant during the save operation, the rotation speed of the blower fan is reduced, and the sound detection device detects the sound in the room after the rotation speed of the blower fan is reduced. Let
When the voice detection device detects a occupant, the rotation speed of the blower fan is increased, and the save operation is further performed for a third set time after the save operation is completed,
An air conditioner that stops the operation of the air conditioner when the voice detection device does not detect an occupant.   The air conditioner according to claim 5, wherein when the save operation is repeated continuously for a set number of times, the operation of the air conditioner is stopped. The voice detection device is
The frequency range of the operation sound of the air conditioner is specified,
When the sound information detected by the sound detection device includes sound information other than the frequency range of the operation sound of the air conditioner, it is determined that there is a person in the room,
The sound information detected by the sound detection device does not include sound information other than the frequency range of the operation sound of the air conditioner, and it is determined that there is no occupant. An air conditioner according to any one of the above.