CN114502893A

CN114502893A - Air conditioner

Info

Publication number: CN114502893A
Application number: CN202080066758.9A
Authority: CN
Inventors: 大西弘祐; 小栗诚
Original assignee: Hitachi Johnson Controls Air Conditioning Inc
Current assignee: Hitachi Johnson Controls Air Conditioning Inc
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2022-05-13
Also published as: WO2021186498A1; JPWO2021186498A1; JP7002662B1

Abstract

An air conditioner (A) is provided with a room temperature detection mechanism (51) for detecting a room temperature, a human detection sensor (110) for detecting a human in the room, and a control unit (60) having an automatic closing function for stopping the operation when the human detection sensor (110) cannot detect a human within a predetermined time, wherein the control unit (60) deactivates the automatic closing function when the room temperature is outside a predetermined automatic closing allowable range (within an automatic closing prohibited area) while the automatic closing function is in the process of being activated.

Description

Air conditioner

Technical Field

The present invention relates to an air conditioner.

Background

The air conditioner has the following functions (automatic closing function): when a user or the like is not present in the room, the air conditioner is switched to a power saving operation or the operation of the air conditioner is stopped. The power-saving operation is performed by subtracting a predetermined value from the set temperature of the remote controller (during heating operation) or adding a predetermined value to the set temperature of the remote controller (during cooling operation), and performing room temperature control based on the changed value. By this power-saving operation or operation stop, unnecessary power consumption can be reduced, that is, power of the air conditioner can be saved.

Patent document 1 proposes the following method: in an air conditioner for detecting a human body by a pyroelectric infrared sensor, even when the difference between the indoor temperature and the user temperature is small and the detection of a subject becomes difficult, the probability of detection of the subject can be increased, and the probability of switching to control different from the setting of the air conditioner can be reduced, so that the user or the like is not given a sense of incongruity due to erroneous control. The detailed method comprises the following steps: when a human body is not detected within a predetermined time and the room temperature is 34 ℃ to 38 ℃ close to the temperature of the human body, the time until switching to the operation different from the setting is set to a predetermined value, and when the room temperature is out of the range, the time is set to a value smaller than the predetermined value.

Documents of the prior art

Patent literature

Patent document 1: japanese patent No. 4324830

Disclosure of Invention

Problems to be solved by the invention

Patent document 1 proposes setting a time until switching to the power saving operation or a time until the operation is stopped to a predetermined value, but even in this predetermined value, there is a possibility that a human body cannot be detected due to the room layout, the arrangement of furniture, and the like, in addition to the room temperature. Therefore, there is a problem in that even if a human body exists in the air-conditioned space, the operation is automatically stopped (automatically turned off) by the unintentional control of the user.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an air conditioner capable of maintaining comfort in a room when an automatic closing function is set.

Means for solving the problems

In order to achieve the above object, an air conditioner according to the present invention includes: a room temperature detection mechanism (e.g., room temperature sensor 51) that detects room temperature; a human detection sensor that detects a human body in a room; and a control unit having an automatic shutoff function for stopping the operation when the human detection sensor fails to detect a human for a predetermined time (for example, time T2 in fig. 7), wherein the control unit disables the automatic shutoff function when the room temperature is outside a predetermined automatic shutoff allowable range (for example, within the automatic shutoff prohibition area in fig. 9) while the automatic shutoff function is enabled. Other embodiments of the present invention will be described in the following embodiments.

The effects of the invention are as follows.

According to the present invention, when the auto-close function is set, the comfort in the room can be maintained.

Drawings

Fig. 1 is an explanatory diagram showing an external configuration of an air conditioner according to the present embodiment.

Fig. 2 is an explanatory diagram illustrating a structure of an indoor unit of an air conditioner according to the present embodiment.

Fig. 3 is an explanatory diagram showing a structure of an outdoor unit of an air conditioner according to the present embodiment.

Fig. 4 is an explanatory diagram showing an appearance of a remote controller of an air conditioner according to the present embodiment.

Fig. 5 is an explanatory diagram showing a structure of a sensor unit of the air conditioner according to the present embodiment.

Fig. 6 is an explanatory diagram showing a configuration of a control unit of the air conditioner according to the present embodiment.

Fig. 7 is an explanatory diagram showing an outline of the automatic shutdown function of the present embodiment.

Fig. 8 is a flowchart showing the processing of the auto-close function of the present embodiment.

Fig. 9 is an explanatory diagram showing the activation and deactivation of the automatic shutdown function according to the present embodiment.

Fig. 10 is a flowchart showing the process of enabling and disabling the auto-close function according to the present embodiment.

Fig. 11 is an explanatory diagram showing a change in the set temperature of the automatic power saving function according to the present embodiment.

Fig. 12 is an explanatory diagram showing other functions of the auto-close function of the present embodiment, which are active and inactive.

Detailed Description

A mode for carrying out the present invention (hereinafter, referred to as an embodiment) will be described in detail with reference to the accompanying drawings as appropriate.

Fig. 1 is an explanatory diagram showing an external configuration of an air conditioner according to the present embodiment. The air conditioner a is a device that performs indoor air conditioning such as cooling using, for example, a heat pump technique. The air conditioner a is substantially constituted by: indoor units 100 installed on indoor walls, ceilings, floors, and the like; an outdoor unit 200 installed outdoors; a remote controller 40 (remote controller, air conditioning control terminal) for communicating with the indoor unit 100 by infrared rays, electric waves, communication lines, etc. and allowing a user to operate the air conditioner a; and various sensor units 50 (see fig. 5) for acquiring information used for controlling and displaying the air conditioner, such as room temperature and outside air temperature. The indoor unit 100 and the outdoor unit 200 are connected by a refrigerant pipe and a communication cable (not shown). The indoor unit 100 further includes an infrared sensor 110 as one sensor of the sensor unit 50.

< indoor Unit >

Fig. 2 is an explanatory diagram illustrating a structure of an indoor unit of an air conditioner according to the present embodiment. The indoor unit 100 includes a heat exchanger 102, a blower fan 103, a horizontal air vane 104 (air direction portion), an up-down air vane 105 (air direction portion), a front panel 106, a casing base 101, various sensor units 50 (see fig. 5), and the like.

The heat exchanger 102 includes a plurality of heat transfer pipes 102a, and is configured to exchange heat between indoor air taken into the indoor unit 100 by the blower fan 103 and the refrigerant flowing through the heat transfer pipes 102a, and to cool or heat the air. The heat transfer pipe 102a communicates with the refrigerant pipe described above, and constitutes a part of a known refrigerant cycle. The blower fan 103 can adjust the air speed. The horizontal wind direction plate 104 is rotated forward and backward by a horizontal wind direction plate motor with a rotation shaft provided at a lower portion of the indoor unit on a base end side as a fulcrum. Then, the front end side of the horizontal wind direction plate 104 is directed to the indoor side, and the front end side of the horizontal wind direction plate 104 can be operated to swing in the horizontal direction. The up-down wind vane 105 is rotated forward and backward by a motor for the up-down wind vane with a rotation shaft provided at both ends in the longitudinal direction of the indoor unit 100 as a fulcrum. Thus, the tip end side of the up-down wind vane 105 can be operated to swing in the up-down direction. The front panel 106 is provided to cover the front surface of the indoor unit, and is rotatable forward and backward by the front panel motor with the rotation shaft of the lower end portion as a fulcrum. Incidentally, the front panel 106 may be fixed to the lower end of the indoor unit without rotating.

In the indoor unit 100, by rotating the blower fan 103, indoor air is sucked into the indoor unit 100 through the air inlet 107 and the filter 108, and heat exchange is performed on the air by the heat exchanger 102. Thus, the heat-exchanged air is cooled or heated by the heat exchanger 102. The heat-exchanged air is guided to the outlet air duct 109 a. The air guided to the outlet duct 109A is sent out from the air outlet 109b to the outside of the indoor unit, and air conditioning is performed indoors. When the air after heat exchange is blown out from the air outlet 109b into the room, the horizontal direction air direction is adjusted by the horizontal air vanes 104, and the vertical direction air direction is adjusted by the vertical air vanes 105.

< outdoor unit >

Fig. 3 is an explanatory diagram showing a structure of an outdoor unit of an air conditioner according to the present embodiment. The outdoor unit 200 of the air conditioner a includes a compressor 202 that compresses a refrigerant, an expansion valve that reduces the pressure of the high-pressure refrigerant, a four-way valve that switches the flow path of the refrigerant, a heat exchanger 206 (outdoor heat exchanger) that exchanges heat between outside air and the refrigerant, and the like. The outdoor unit 200 is partitioned (divided) into a heat exchanger chamber 204 and a machine chamber 205 by a partition 211, an electrical component box 210, and a lead wire support member 209. A propeller fan 207 for promoting heat exchange between the refrigerant circulating in the refrigerant piping and the outside air, a motor for driving the propeller fan 207, a fan support for rotatably supporting the propeller fan 207, and a heat exchanger 206 for performing heat exchange between the outside air and the circulating refrigerant are disposed in the heat exchanger chamber 204. The machine chamber 205 is provided with a compressor 202 for converting a circulating refrigerant into a high-temperature and high-pressure gas refrigerant, an electric expansion valve for converting a normal-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure liquid refrigerant, a reactor for electric components, and a heat transfer pipe of a refrigerant pipe through which the refrigerant flows. The electrical component box 210 accommodates electrical components for controlling the outdoor unit 200, and an electrical installation cover covers the electrical components.

< remote controller >

Fig. 4 is an explanatory diagram showing an appearance of a remote controller of an air conditioner according to the present embodiment. The remote controller 40 is operated by a user to transmit an infrared signal to a remote controller receiving unit Q (see fig. 1) of the indoor unit. The content of the signal is various commands such as an operation request, a change in set temperature, a timer, a change in operation mode, a stop request, and the like. The air conditioner a can perform at least cooling, heating, dehumidification, and the like of the room based on the signal. Further, other air conditioning functions such as air cleaning may be provided. The air conditioner a can perform various adjustments of indoor air.

When the smart button (これっきりボタン)41 of the remote controller 40 is pressed, the automatic power saving function is turned into the unattended energy saving mode when no human body is recognized during operation, and the operation is automatically stopped when a predetermined time has elapsed based on the automatic power off function. Details will be described below with reference to fig. 7 and 8.

< sensor part >

Fig. 5 is an explanatory diagram showing a structure of a sensor unit of the air conditioner according to the present embodiment. The sensor unit 50 is provided in the indoor unit 100 and the outdoor unit 200. The sensor unit 50 includes a room temperature sensor 51 (temperature detection unit), a humidity sensor 52, an infrared sensor 110 (see fig. 1) as a human detection sensor, an outside air temperature sensor, a compressor temperature sensor, a refrigerant pipe temperature sensor, a clock, and the like.

As the human detection sensor, a near infrared ray sensor, a thermopile, an infrared thermal imager, a pyroelectric type sensor, an ultrasonic sensor, a noise sensor may be used in addition to the infrared ray sensor 110. When the human detection sensor is a thermopile, for example, the horizontal direction × the vertical direction is preferably formed by 1 × 1 pixel, 4 × 4 pixel, and 1 × 8 pixel, and is preferably provided in a lower portion of the center of the front panel 106 (see fig. 1) in the left-right direction.

The human detection sensor may be an imaging unit. The human body detection unit 61 (see fig. 6) detects the position of the head of a person or the like from the image captured by the image capturing unit, and sets the position of the head as the position of the person. In the present embodiment, the position of the human foot is detected in addition to the position of the human. The position of the human foot may be directly detected based on the image captured by the image capturing unit, or may be estimated from the position of the head or the like of the human.

< control part >

Fig. 6 is an explanatory diagram showing a configuration of a control unit of the air conditioner according to the present embodiment. The control unit 60 is provided in the electrical component. The control unit 60 drives the blower fan 103, the horizontal air vanes 104, and the vertical air vanes 105 of the indoor unit 100, and drives the compressor 202 and the propeller fan 207 of the outdoor unit 200, based on information from the remote controller 40 via the transmission/reception unit 45 and information from the sensor unit 50.

The control unit 60 includes: a human body detection unit 61 that detects a human body based on information from the infrared sensor 110; an automatic shutdown function unit 62 that automatically stops the operation by the automatic shutdown function if no person (human body) is recognized; an unmanned energy saving operation function unit 63 (automatic power saving function unit) for automatically setting an energy saving setting by the automatic power saving function if no person is recognized; an airflow control unit 64 that controls an airflow direction unit that changes the airflow direction of the conditioned air; and a storage section 65.

Fig. 7 is an explanatory diagram showing an outline of the automatic shutdown function of the present embodiment. As described above, the automatic shutdown function automatically stops the operation if no person is recognized during the operation. It is possible to suppress unnecessary power consumption caused by forgetting to turn off the air conditioner a. Here, the auto-off function including the auto-power-saving function will be described. With appropriate reference to figure 6.

The control unit 60 sets "auto off", and during operation, after the absence of a person is recognized and after time T1 (first predetermined time period), (1) becomes "auto power saving (unmanned energy saving)". Thereafter, (2) if time T2 (second predetermined time) elapses after the absence of the person is recognized, the "automatic shutdown" is performed (temporary stop). In the "auto-off", the infrared sensor 110 is operated, and if a person is detected, the operation is automatically started. After the operation is resumed, if no person is recognized, the process returns to (1).

And, (3) in a case where a person is not detected even if the time T3 (third predetermined time) elapses after "auto off", complete stop ("auto off" stop).

Fig. 8 is a flowchart showing the processing of the auto-close function of the present embodiment. With appropriate reference to figure 6. While the "auto off" setting is in effect (step S80), the control unit 60 detects that no person is present (step S81), and proceeds to step S82 if no person is present (step S81, yes), and returns to step S81 if no person is present (step S81, no).

The control unit 60 determines whether or not the time T1 has elapsed after the detection of the absence (step S82), and proceeds to step S83 if the time T1 has elapsed (step S82, yes), and returns to step S81 if the time T1 has not elapsed (step S82, no).

In step S83, the control unit 60 starts "automatic power saving", determines whether or not a human body is detected (step S84), and proceeds to step S85 if no human body is detected (step S84, no), and proceeds to step S8A if a human body is detected (step S84, yes).

The control unit 60 determines whether or not the time T2 has elapsed after the detection of the absence (step S85), and proceeds to step S86 if the time T2 has elapsed (step S85, yes), and returns to step S84 if the time T2 has not elapsed (step S85, no).

In step S86, the control unit 60 starts "auto-off", determines whether or not a human body is detected (step S87), and proceeds to step S88 if no human body is detected (step S87, no), and proceeds to step S8B if a human body is detected (step S87, yes). In step S8B, control unit 60 starts the operation and returns to step S81.

The control unit 60 determines whether or not the time T3 has elapsed after the start of "automatic closing" (step S88), and stops "automatic closing" when the time T3 has elapsed (yes at step S88) (step S89). On the other hand, if the time T3 has not elapsed (no at step S88), the controller 60 returns to step S87.

Fig. 9 is an explanatory diagram showing the activation and deactivation of the automatic shutdown function according to the present embodiment. Fig. 9 is a diagram showing the activation and deactivation of the automatic shutoff function, and the upper limit temperature RT1 and the lower limit temperature RT2 are set as the automatic shutoff permission region. That is to say that the first and second electrodes,

the lower limit temperature RT2 is less than or equal to the room temperature and less than or equal to the upper limit temperature RT1(1)

In the case of the above formula (1), the automatic shut-off function is effective,

room temperature < lower limit temperature RT2 or upper limit temperature RT1 < room temperature (2)

In the case of the above equation (2), the auto-close function is disabled as the auto-close prohibition region.

In this setting, the comfort of the person in the room can be taken into consideration, and energy saving performance can also be ensured. As described in patent document 1, a pyroelectric infrared sensor is difficult to detect a human when the temperature difference between room temperature and a human body is small. Therefore, if there is a person, it may be determined that there is no person.

In the present embodiment, in order to cope with heatstroke, automatic shutdown is not performed when the room temperature is higher than, for example, 30 ℃. Further, the farther the distance from the indoor unit 100 is, the more difficult it is to detect a person. In this case, even if it is determined that there is no person when there is a person, the automatic closing may not be performed when the room temperature is higher than 30 ℃.

On the other hand, in order to cope with the fear of hypothermia and frostbite, the automatic shutdown may not be performed when the room temperature is lower than, for example, 2 ℃.

Further, even when a person may not be detected due to the layout of a room, the arrangement of furniture, or the like, the automatic closing function is disabled in the automatic closing prohibition area, so that the operation is not stopped, and the comfort in the room can be maintained.

Fig. 10 is a flowchart showing the process of enabling and disabling the auto-close function according to the present embodiment. The control unit 60 determines whether or not the room temperature is within the automatic shutoff permission region during operation (step S1), validates the setting of "automatic shutoff" when the room temperature is within the automatic shutoff permission region (step S1, yes), invalidates the setting of "automatic shutoff" when the room temperature is outside the automatic shutoff permission region (step S1, no) (step S3), and repeats the processing. Further, the processing of fig. 10 and the processing of fig. 8 are parallel processing.

Fig. 11 is an explanatory diagram showing a change in the set temperature of the automatic power saving function according to the present embodiment. The control section 60 starts "automatic power saving" (starts unmanned energy saving) after detecting the absence of the person and after a first predetermined time (for example, time T1). In this case, for example, the control unit 60 increases the temperature from the set temperature of the remote controller 40 by 2 to 3 ℃ during cooling. Specifically, when the set temperature RT0 of the remote controller 40 is set to 28 ℃, the set temperature increases by 3 ℃ and becomes 31 ℃ in the unmanned energy saving operation. The setting of 31 ℃ contradicts the case where the upper limit temperature RT1 is 30 ℃ as the auto-off permission region, and becomes unintentional control by the user.

When the "auto-off" setting is enabled, the upper limit value of the set temperature for unmanned energy saving is set to the upper limit temperature RT1 or less as the auto-off permission region. That is, when the automatic shutoff function is enabled, the control unit 60 preferably sets the upper limit temperature of the set temperature during the energy-saving operation within the automatic shutoff permission range. Specifically, the controller 60 sets the upper limit temperature of the set temperature during the energy saving operation during cooling to be equal to or lower than the upper limit temperature RT1, and sets the lower limit temperature of the set temperature during the energy saving operation during heating to be equal to or higher than the lower limit temperature RT 2.

Fig. 12 is an explanatory diagram of other functions of the auto-close function of the present embodiment, which are active and inactive. In fig. 9, as shown in equation (2), the automatic shutoff prohibition region is set to the case where the room temperature is lower than the lower limit temperature RT2 or the room temperature exceeds the upper limit temperature RT1, but the present invention is not limited to this. In FIG. 12, the Temperature and humidity of the room are determined according to the general WBGT (Wet Bulb thermometer)). The control unit 60 invalidates the setting of "auto-off" in the auto-off prohibition region.

The air conditioner of the present embodiment described above has the following features.

The air conditioner a includes a room temperature detection means (e.g., the room temperature sensor 51) for detecting a room temperature, a human detection sensor for detecting a human in the room, and a control unit 60 having an automatic closing function unit 62 for stopping the operation when the human detection sensor cannot detect a human within a predetermined time (e.g., time T2), and the control unit 60 disables the automatic closing function when the room temperature is outside a predetermined automatic closing allowable range (see fig. 9) while the automatic closing function is in the process of enabling the automatic closing function. Thus, when the automatic closing function is set, even when the room temperature is outside the predetermined automatic closing allowable range, the air conditioning in the room is continued, and thus the comfort in the room can be maintained.

The control unit 60 has an unmanned energy saving operation function unit 63 that performs an energy saving operation when no person is recognized in the room, and when the automatic shutdown function is enabled, the control unit 60 sets the upper limit temperature of the set temperature during the energy saving operation within the automatic shutdown allowable range. Thus, the upper limit temperature of the set temperature during the energy-saving operation is within the automatic shutdown allowable range, and the comfort in the room can be maintained.

The controller 60 can set at least one of the upper limit temperature RT1 of the automatic shutoff permission range and the lower limit temperature RT2 of the automatic shutoff permission range for each operation mode. Specifically, during heating, the room temperature tends to decrease even when the operation is stopped, and it is considered that heat stroke does not occur. That is, the heating and cooling may be set separately.

It is preferable that the controller 60 has a humidity detection means (for example, the humidity sensor 52) for detecting the humidity in the room, and disables the automatic shutoff function when the temperature and humidity are in a region where there is a fear of heatstroke (see fig. 12). This continues the air conditioning of the room, and thus the comfort of the room can be maintained.

Preferably, the control unit 60 restarts the operation when the room temperature reaches the upper limit temperature or the lower limit temperature of the auto-off allowable range after the operation is stopped. This can maintain the comfort in the room.

Preferably, the control unit 60 notifies the operator with a sound or a buzzer to prompt the operator to restart the operation when the room temperature approaches or reaches the automatic-off upper limit temperature or the automatic-off lower limit temperature after the operation is stopped. Can be used for preventing heatstroke, hypothermia or freezing.

Preferably, the control unit 60 transmits a mail having a content outside the auto-off allowable range to a terminal registered in advance when the room temperature reaches the auto-off upper limit temperature or the auto-off lower limit temperature after the operation is stopped. Specifically, a mail for prompting confirmation of security against any chance is transmitted to a terminal (for example, a smartphone) or the like of a login destination such as the person or a family member using Wifi coordination.

Preferably, the control unit 60 performs the freezing process on the outdoor heat exchanger while performing the room temperature recovery (heating) operation when the room temperature gradually approaches the automatic shutoff lower limit temperature after the operation is stopped. The control unit 60 causes the outdoor heat exchanger (see the heat exchanger 206 in fig. 3) to function as an evaporator, and causes the outdoor heat exchanger to freeze or condense. This allows small dust adhering to heat exchanger 206 to be washed away. The heat exchanger can inhibit the reduction of heat exchange capability caused by the blockage among the fins of the heat exchanger, and has an energy-saving effect.

The human body detecting unit 61 may be a human detection sensor that detects a human body based on an image of the imaging unit. As the human detection sensor, an infrared sensor, a near infrared sensor, a thermopile, an infrared thermal imager, a pyroelectric sensor, an ultrasonic sensor, or a noise sensor may be used. When a thermopile is used as the temperature detection sensor, for example, a thermopile having 1 × 1 pixel, 4 × 4 pixel, or 1 × 8 pixel in the horizontal direction × vertical direction is preferably provided in the lower portion of the center of the front panel 106 in the left-right direction. The surface temperature of the room, the surface temperature of human clothes, the temperature of human skin, and the surface temperature of each part of the floor, wall, and ceiling can be detected by the temperature detection sensor.

Description of the symbols

40-remote controller (air conditioning control terminal), 45-transceiver, 50-sensor section, 51-room temperature sensor (room temperature detection mechanism), 52-humidity sensor, 60-control section, 61-human body detection section, 62-automatic off function section, 63-unmanned energy saving operation function section (automatic power saving function section), 64-airflow control section, 65-storage section, 100-indoor unit, 103-air supply fan, 104-left and right wind direction plate (wind direction section), 105-up and down wind direction plate (wind direction section), 106-front panel, 109 b-air outlet (air outlet), 110-infrared sensor (human detection sensor), 200-outdoor unit, 202-compressor, 206-heat exchanger (outdoor heat exchanger), 207-propeller fan, a-air conditioner, RT 1-upper limit temperature, RT 2-lower limit temperature.

Claims

1. An air conditioner is characterized by comprising:

a room temperature detection mechanism that detects a room temperature;

a person detection sensor that detects a person in a room; and

a control unit having an automatic shutdown function for stopping the operation when the human detection sensor fails to detect the human within a predetermined time,

the control unit disables the automatic shutoff function when the room temperature is outside a predetermined automatic shutoff allowance range while the automatic shutoff function is enabled.

2. The air conditioner according to claim 1,

the control part has an unmanned energy-saving operation function for performing energy-saving operation when the control part recognizes that no person is in the room,

the control unit sets the upper limit temperature of the set temperature during the energy saving operation within the automatic shut-off allowable range when the automatic shut-off function is enabled.

3. The air conditioner according to claim 1,

the control unit may set at least one of an upper limit temperature of the automatic shutoff permission range and a lower limit temperature of the automatic shutoff permission range for each operation mode.

4. The air conditioner according to claim 1,

a humidity detection mechanism for detecting the humidity in the room,

the control unit disables the automatic shutdown function when the temperature and the humidity are in a region where the user may suffer from heatstroke.

5. The air conditioner according to claim 1,

the control unit restarts the operation when the room temperature reaches an upper limit temperature or a lower limit temperature of the automatic shutoff permission range after the operation is stopped.

6. The air conditioner according to claim 1,

the control unit notifies the operation restart with a sound or a buzzer when the room temperature approaches or reaches the automatic-off upper limit temperature or the automatic-off lower limit temperature after the operation is stopped.

7. The air conditioner according to claim 1,

after the operation is stopped, the control unit transmits a mail having a content outside the automatic shutdown permission range to a terminal registered in advance as a login destination when the room temperature reaches an automatic shutdown upper limit temperature or an automatic shutdown lower limit temperature.

8. The air conditioner according to claim 1,

the control unit performs a freezing process of the outdoor heat exchanger while performing an operation for returning the room temperature when the room temperature gradually approaches the automatic-off lower limit temperature after the operation is stopped.

9. The air conditioner according to claim 1,

the human detection sensor is a temperature detection unit or a pyroelectric infrared sensor that detects a surface temperature of the human.

10. The air conditioner according to claim 1,

the human detection sensor is an image pickup unit.