JP4033190B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner having functions for improving the air environment, such as an oxygen-enriched air supply function, a ventilation function, and an air purification function.

  An air conditioner having an air cleaning function, a ventilation function or an oxygen-enriched air supply function has been developed, and there is a health-oriented boom in recent years, and many air conditioners having these functions have been put into practical use. This type of air conditioner detects indoor dirt, and operates / stops the respective functions or adjusts the operation amount according to the detected value, thereby maintaining the room in a comfortable environment.

  FIG. 5 shows a conventional method of operating an air conditioner with a ventilation function. The indoor environment is detected, and the indoor fan speed and the ventilation fan speed are adjusted according to the detection result and the operating condition of the air conditioner. The interior of the room is maintained in an optimum environment (see, for example, Patent Document 1).

In addition, air conditioners that carry out air cleaning, oxygen-enriched air supply operations, and ventilation operations during the operation of air conditioners to maintain the indoor environment in an optimum environment more efficiently have been put into practical use. Yes.
JP 2004-101116 A

  However, in the above conventional control, only the ventilation operation is performed when the air conditioner is stopped, or the air purification operation, the oxygen-enriched air supply function operation and the ventilation operation are stopped during the operation stop. When the machine was shut down, the indoor air environment deteriorated.

  The present invention solves the above-described conventional problems, and always detects the indoor air environment even when the operation of the air conditioner is stopped, optimally executes the oxygen-enriched air supply operation, and further performs the air cleaning operation. An object of the present invention is to provide an air conditioner that constantly creates a comfortable indoor environment more efficiently by having an operation mode in which ventilation operation is simultaneously performed.

In order to solve the above-described conventional problems, an air conditioner of the present invention includes an oxygen concentration sensor that constantly detects the oxygen concentration of room air in an air conditioner with a ventilation function and / or an oxygen-enriched air supply function. When the oxygen concentration sensor detects a low oxygen concentration while the operation of the air conditioner is stopped, the operation of the equipped function is automatically started, and when the low oxygen concentration is restored, the operation of the equipped function is automatically stopped. The patrol operation mode includes an internal timer for counting the low oxygen concentration detection time, and an oxygen monitor for visually displaying the oxygen concentration sensor value and the indoor oxygen concentration calculated from the internal timer, and the patrol operation mode. An air conditioner having a control for starting and ending ventilation operation or / and oxygen-enriched air supply operation based on the oxygen monitor.

In addition, the air conditioner of the present invention is provided with a ventilation function, and includes an oxygen concentration sensor or a dirt sensor that constantly detects the oxygen concentration or dirt of the indoor air, and the oxygen concentration sensor or the dirt sensor while the air conditioner is stopped. When the dirt sensor detects a low oxygen concentration or dirt, a ventilation operation is automatically started, and when the low oxygen concentration or dirt state is recovered, a patrol operation mode is automatically provided.

In addition, the air conditioner of the present invention is provided with an air cleaning function, and includes a dirt sensor that constantly detects the dirt of indoor air. When the dirt sensor detects dirt while the air conditioner is stopped, the air conditioner automatically The air cleaning operation is started, and a patrol operation mode for automatically stopping the air cleaning operation when the low oxygen concentration or the dirty state is recovered is provided.

  As a result, even when the operation is stopped, the oxygen concentration in the room can be kept constant and the air can be kept clean, and a comfortable space can be created throughout the year.

  The air conditioner of the present invention always detects the oxygen concentration in the room even when the operation of the air conditioner is stopped, and automatically executes the oxygen-enriched air supply operation when the oxygen concentration in the room decreases, thereby The concentration can always be kept constant. Furthermore, by providing a dirt sensor and performing the air cleaning operation and the ventilation operation in the same manner, it is possible to always create a comfortable space with cleaner and more efficient air quality in the room.

  A first aspect of the present invention is an air conditioner with an oxygen-enriched air supply function, comprising an oxygen concentration sensor that constantly detects the oxygen concentration of indoor air, and the oxygen concentration sensor is a low oxygen concentration when the air conditioner is stopped. Is detected, and the operation of the equipped function is automatically started, and when the low oxygen concentration is restored, the operation of the equipped function is automatically stopped. A timer, an oxygen monitor that visually displays the oxygen concentration sensor value and the indoor oxygen concentration calculated from the internal timer, and ventilation operation or / and oxygen-enriched air based on the oxygen monitor during the patrol operation mode By providing the control to start and end the supply operation, the oxygen concentration in the room can be kept constant even when the operation of the air conditioner is stopped.

  In particular, the air conditioner according to the second aspect of the present invention includes the air conditioner according to the first aspect of the present invention including a fouling function and a fouling sensor that constantly detects fouling of room air. By detecting a low oxygen concentration or dirt, it automatically starts operation of the equipped function, and when the low oxygen concentration or dirt state is recovered, it has a patrol operation mode in which operation of the equipped function is automatically stopped. Even when the operation of the air conditioner is stopped, the oxygen concentration of the room air can be kept constant and the dirt can be removed.

  According to a third aspect of the invention, in particular, the air conditioner of the first aspect of the invention comprises a dirt sensor that constantly detects an air purifying function and dirt in room air, and the dirt sensor detects dirt while the air conditioner is stopped. The operation of the built-in function is automatically started, and when the dirty state is recovered, the operation of the built-in function is automatically stopped, thereby providing a patrol operation mode. The oxygen concentration can be kept constant and the dirt can be removed.

  In particular, the air conditioner according to the first aspect of the present invention further includes an air purifying function, a ventilation function, and a dirt sensor that constantly detects dirt in the room air, and the oxygen sensor or the air conditioner is stopped when the air conditioner is stopped. When the dirt sensor detects low oxygen concentration or dirt, a patrol operation mode that automatically starts a plurality of operation of the equipped function and automatically stops operation of the equipped function when the low oxygen concentration or dirt state is recovered. By providing it, the oxygen concentration of the room air can be kept constant more efficiently and dirt can be removed even when the operation of the air conditioner is stopped.

In the fifth aspect of the invention, in particular, in any of the first to fourth aspects of the invention, it is possible to select the presence / absence setting of the patrol operation mode with a remote control type operating device.
The user can select the presence / absence of the patrol operation mode, and the air conditioner can be operated to meet the user's needs.

  In the sixth aspect of the invention, in particular, when performing the setting of the patrol operation mode of the fifth aspect of the invention, it is possible to select an oxygen-enriched supply operation, a ventilation operation, and an air cleaning operation by a remote control type operation device. The user can select the function of the patrol operation mode, and can further operate the air conditioner that meets the user's needs.

  In a seventh aspect of the invention, in particular, in the patrol operation mode of the first to fourth aspects, if any of the equipped functions is being executed, the indoor fan of the air conditioner is operated, If it is stopped, the control means for stopping the indoor fan is provided, so that the amount of intake of indoor air is increased when the built-in function is executed, and air can be improved efficiently.

  In the eighth aspect of the invention, in particular, when any of the above-mentioned functions is being executed during the patrol operation mode of the first to fourth aspects of the invention, the driven indoor front panel of the air conditioner is opened, By providing a control means that closes the front panel when any of the equipped functions is stopped, the amount of indoor air sucked can be increased when the equipped function is executed, and air can be improved efficiently. Become.

  In the ninth aspect of the invention, in particular, in the patrol operation mode of the first to fourth aspects of the invention, if any of the above functions is being executed, the upper and lower blades disposed at the blower outlet of the blower circuit are moved up and down. By providing control means for closing the upper and lower blades when any of the provided functions is stopped, the air blown out from the air conditioner reaches the entire room when the provided function is executed, thereby improving air efficiency. Can be made.

  In the tenth aspect of the invention, in particular, in the patrol operation mode of the first to fourth aspects of the invention, if any of the above-mentioned equipped functions is being executed, the left and right blades disposed at the blower outlet of the blower circuit are moved left and right. By providing a control means for fixing the left and right blades when any of the provided functions is stopped, the air blown from the air conditioner reaches the entire room when the provided function is executed, thereby improving the air efficiency. It becomes possible to do.

  In an eleventh aspect of the invention, in particular, in any of the third and fourth aspects of the invention, an internal timer for counting a dirt detection time, and the dirt sensor value and the indoor dirt condition calculated from the internal timer are visually displayed. And a control for starting and ending the air cleaning operation based on the dirt monitor during the patrol operation mode, so that the user can more accurately grasp the degree of dirt in the room and By notifying the timing, it is possible to improve user convenience.

  According to a twelfth aspect of the invention, in particular, in the second and fourth aspects of the invention, an internal timer that counts the dirt detection time, and a dirt monitor that visually displays the dirt sensor value and the indoor dirt condition calculated from the internal timer. And the control for starting and ending the ventilation operation based on the dirt monitor during the patrol operation mode allows the user to more accurately grasp the indoor dirt condition and inform the user of the operation timing of the equipped function. Thus, it is possible to improve user convenience.

  In a thirteenth aspect of the invention, in particular, in the second and fourth aspects of the invention, an internal timer for counting a low oxygen concentration detection time, and the oxygen concentration sensor value and the indoor oxygen concentration calculated from the internal timer are visually displayed. And a control for starting and ending ventilation operation based on the oxygen monitor during the patrol operation mode, so that the oxygen concentration in the room can be grasped more accurately and the user can perform the operation of the equipped function. By notifying the timing, it is possible to improve user convenience.

  In a fourteenth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, an internal timer for counting a low oxygen concentration detection time, the oxygen concentration sensor value, and the indoor oxygen concentration calculated from the internal timer are visually And a control for starting and ending the oxygen-enriched air supply operation based on the oxygen monitor during the patrol operation mode. It is possible to improve the convenience of the user by notifying the operation timing of the provided function to the user.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows the inside of an indoor unit in the embodiment of the present invention.
The front port has a suction port 1, an upper surface portion has a suction port 2, and a lower surface portion has a blower outlet 3, and the suction port 1 is provided with a drive-type front panel 4 that performs opening and closing operations respectively during operation and stop It has been. The air outlet 3 is provided with upper and lower blades 5 that can automatically swing in the vertical direction and adjust the wind direction, and left and right blades 6 that can automatically adjust the wind direction in the horizontal direction.
An indoor heat exchanger 7 and an indoor fan 8 are provided in the blower circuit from the inlets 1 and 2 to the outlet 3. Furthermore, between the inlet 1 and the indoor heat exchanger 7, an oxygen-enriched air that supplies oxygen-enriched air that has passed through an oxygen-enriched membrane installed in the outdoor unit and an electric air purification unit 9 to the room. A supply unit 10 is provided. That is, the air sucked from the suction ports 1 and 2 passes through the air cleaning unit 9 and the oxygen-enriched air supply unit 10 and is blown out by the indoor fan 8 from the blowout port 3 into the room. The ventilation fan unit 11 is provided beside the indoor heat exchanger 7 and discharges dirty air sucked from the room through the ventilation duct 12 to the outside.
The dirt sensor 13 and the oxygen sensor 14 are provided between the suction ports 1 and 2 and the indoor heat exchanger 7, and can detect indoor dirt and oxygen concentration, respectively. Further, the dirt monitor 15 and the oxygen concentration monitor 16 are provided beside the upper and lower blades 5 that are easy to see from the user.

The dirt monitor 15 represents the indoor dirt condition calculated from the dirt sensor value detected by the dirt sensor 13 and the dirt detection duration, and is red when it is most dirty, yellow when it is slightly dirty, and dirt. By illuminating the green LED in the absence state, the user can visually recognize the degree of dirt. Similarly, the oxygen concentration monitor 16 also enables the user to visually recognize the degree of contamination by turning on the red LED during low oxygen, the yellow LED during medium oxygen, and the green LED during high oxygen.

  Next, the configuration of the control circuit is shown in FIG.

  The control unit 17 performs overall control of the air conditioner. The control unit 17 includes a dirt sensor 13, an oxygen concentration sensor 14, a dirt monitor 15, an oxygen monitor 16, an air cleaning unit 9, and an oxygen enrichment supply unit. 10, a ventilation fan unit 11, a front panel 4, an indoor fan 8, upper and lower blades 5, left and right blades 6, and a receiving unit 18 are connected. The receiving unit 18 receives an infrared ray transmitted from a remote control type operating device 19.

  The remote control type operation device 19 (hereinafter referred to as a remote controller) includes a button that can select whether or not to set the patrol operation mode, and an air cleaning operation, an oxygen-enriched air supply operation, and a ventilation operation when the patrol operation mode is executed. Buttons that can select the presence or absence of each are arranged.

  About the air conditioner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

FIGS. 3A and 3B are flowcharts showing a control method of the oxygen-enriched air supply operation, the air cleaning operation, the ventilation operation, and the indoor fan in the patrol operation mode. When the remote controller 19 receives an air conditioner stop signal or an off signal such as turning off the timer (St1), it stops normal operations such as cooling, heating, and air blowing, and closes the front panel 4 and the upper and lower blades 5. To the state, the oxygen-enriched air supply unit 10, the ventilation fan unit 11, and the air cleaning unit 9 are also stopped (St2). At this time, if the patrol operation mode is not set by the remote controller 19, the stop state is maintained (St3), and when the patrol operation mode is set (St3), the dirt sensor 13 and the oxygen concentration sensor 14 detect the dirt and the oxygen concentration sensor. Execute.

  In order to more accurately determine the degree of indoor contamination, the indoor contamination level is calculated from the sensor value detected by the contamination sensor 13 and the temporal change in the sensor value, and the user visually determines the indoor contamination level. As can be recognized, depending on the level of dirt, the dirt monitor 15 is lit red if it is dirty, yellow if it is slightly dirty, and green if it is clean (St4).

  Similarly, for the oxygen monitor 16, the indoor oxygen concentration is calculated from the oxygen concentration sensor value detected by the oxygen concentration sensor 14 and the change over time of the sensor value. Is red, yellow if the medium oxygen concentration is lit, and green if the oxygen concentration is high (St5).

  At this time, if the dirt monitor 15 is green (St6), or if the air cleaning operation is set to no (St7) in the patrol operation mode by the remote controller 19, the air cleaning unit 9 is maintained in a stopped state ( St11).

  However, if the dirt monitor 15 is yellow or red (St6) and the air purifying operation is set to be enabled (St7) in the patrol operation mode by the remote controller 19, the operation of the air purifying unit 9 is started (St8).

  While the air cleaning unit 9 is in operation, it is always detected by the dirt sensor 13, and the change in the indoor dirt condition is continuously displayed by the color change on the dirt monitor 15 (St9), and the dirt monitor 15 displays green for a predetermined time X time. If the lighting continues for a long time (St10), it is determined that the indoor air has been restored to a clean state, and the operation of the air purification unit 9 is stopped.

  Similarly, for the oxygen-enriched air supply operation, when the oxygen concentration monitor 16 is green (St12), or when the oxygen-enriched air supply operation is set to no (St13) in the patrol operation mode by the remote controller 19, The oxygen-enriched air supply unit 10 is maintained in a stopped state (St11).

  However, if the oxygen concentration monitor 16 is yellow or red (St12), and the oxygen-enriched air supply operation is set to Yes (St13) in the patrol operation mode by the remote controller 19, the operation of the oxygen-enriched air supply unit 10 is performed. Is started (St14). During the operation of the oxygen-enriched air supply unit 10, the oxygen concentration sensor 14 always detects the change, and the oxygen concentration monitor 16 continues to display the color change with the oxygen concentration monitor 16 (St 15). If the green color is continuously lit for a predetermined time Y or longer (St16), it is determined that the indoor air has recovered to the high oxygen concentration state, and the operation of the oxygen-enriched air supply unit 10 is stopped.

  As for the ventilation operation, if the dirt monitor 15 and the oxygen concentration monitor 16 are green (St18), or if the ventilation operation is set to no (St19) in the patrol operation mode by the remote controller 19, the ventilation fan unit 11 Is maintained in a stopped state (St25).

However, if the dirt monitor 15 or the oxygen concentration monitor 16 is yellow or red (St18), and the ventilation operation is set to Yes (St19) in the patrol operation mode by the remote controller 19, the operation of the ventilation fan unit 11 is started. (St20). While the ventilation fan unit 11 is in operation, it is always detected by the dirt sensor 13 and the oxygen concentration sensor 14, and the indoor dirt condition and the change in oxygen concentration are continuously displayed by the color change on the dirt monitor 15 and the oxygen concentration monitor 16 ( St21, St22).

  Further, the rotation speed of the ventilation fan is determined according to the dirt monitor 15, the oxygen concentration monitor 16, each lighting time and color, and whether the rotation speed is Hi or Lo is selected. Carry out driving. When the dirt monitor 15 is lit continuously for a predetermined time X hours or longer and the oxygen concentration monitor 16 is lit continuously for a predetermined time Y hours or longer (St24), the indoor air is clean and high oxygen It is determined that the concentration state has been recovered, and the operation of the ventilation fan unit 11 is stopped.

  The indoor fan 8 in the patrol operation mode is either when the dirt monitor 15 and the oxygen concentration monitor 16 are green (St18), or any of the air purification unit 9, the oxygen-enriched air supply unit 10, and the ventilation fan unit 11. If the operation is stopped (St26), the indoor fan 8 is kept stopped (St32).

  However, if the dirt monitor 15 or the oxygen concentration monitor 16 is yellow or red (St18) and any one of the air cleaning unit 9, the oxygen-enriched air supply unit 10 and the ventilation fan unit 11 is in an operating state (St26). The operation of the indoor fan 8 is started (St27).

  During the operation of the indoor fan 8, it is always detected by the dirt sensor 13 and the oxygen concentration sensor 14, and the indoor dirt condition and the oxygen concentration change are continuously displayed by the color change on the dirt monitor 15 and the oxygen concentration monitor 16 (St28). , St29).

  Further, by determining whether the rotational speed of the indoor fan 8 is Hi, Me, or Lo based on the dirt monitor 15, the oxygen concentration monitor 16, each lighting time and color, and selecting the rotational speed according to the indoor air load, It is possible to increase or decrease the amount of indoor air sucked in and improve the air with high efficiency.

  When the operation of any of the air purification unit 9, the oxygen-enriched air supply unit 10 and the ventilation fan unit 11 is stopped (St31), it is determined that the indoor air has been restored to a clean state and a high oxygen concentration state, The operation of the indoor fan 8 is stopped.

  Next, FIG. 4 shows the operation and timing of each part when the user selects all of the air purification unit 9, the oxygen-enriched air supply unit 10 and the ventilation fan unit 11 with the patrol operation mode in the remote controller 19. Shown in

  The front panel 4 opens the front panel 4 if any of the air purification unit 9, the oxygen-enriched air supply unit 10 and the ventilation fan unit 11 is in an operating state, and closes if any of them is in a stopped state. By doing so, the indoor air can be efficiently sucked and the user can visually recognize that the air environment modification unit is operating.

  Further, the upper and lower blades 5 and the left and right blades 6 swing if any of the air purifying unit 9, the oxygen-enriched air supply unit 10 and the ventilation fan unit 11 is in an operating state and close if all of them are in a stopped state. By fixing, it is possible to distribute the improved blown air throughout the room.

As described above, in the present embodiment, when the patrol operation mode is set, the air cleaning unit 9, the oxygen-enriched air supply unit 10, the ventilation fan unit 11, and other components are interlocked with the monitor that displays the indoor dirt condition. By operating each at the timing as described above, the user can recognize the relationship between the degree of dirt in the room and the operation of each part, and at the same time, it can efficiently improve the indoor air even when the air conditioner is stopped. It is possible to create a comfortable environment indoors all year round.

  As described above, the air conditioner according to the present invention can comfortably hold the room even when the operation is stopped, and can create a comfortable environment throughout the year. It can be applied to the use of the existing air conditioner.

The block diagram of the indoor unit in embodiment of this invention Block diagram of a control circuit in an embodiment of the present invention (A) is a flowchart showing a method of oxygen-enriched air supply operation and air cleaning operation during patrol operation in the embodiment of the present invention. (B) is a ventilation operation and indoor fan during patrol operation according to the embodiment of the present invention. Showing the operation method The time chart which shows the operation timing of each part in embodiment of this invention Flow chart of control method of conventional air conditioner with ventilation function

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inlet 2 Inlet 3 Outlet 4 Driven front panel 5 Top and bottom blades 6 Left and right blades 7 Indoor heat exchanger 8 Indoor fan 9 Air cleaning unit 10 Oxygen-enriched air supply unit 11 Ventilation fan unit 12 Ventilation duct 13 Dirt sensor 14 Oxygen sensor 15 Dirt monitor 16 Oxygen concentration monitor 17 Control unit 18 Receiver 19 Remote controller (operator)

Claims (12)

An air conditioner with a ventilation function and / or an oxygen-enriched air supply function is provided with an oxygen concentration sensor that constantly detects the oxygen concentration of room air, and the oxygen concentration sensor reduces the low oxygen concentration while the air conditioner is stopped. Upon detection, automatic ventilation operation or / and oxygen Tomica air supply operation starts, stops automatically ventilation operation or / and oxygen Tomica air supply operation when the low oxygen concentration is restored, comprising a patrol operation mode, An internal timer for counting the low oxygen concentration detection time; and an oxygen monitor for visually displaying the oxygen concentration sensor value and the indoor oxygen concentration calculated from the internal timer; and based on the oxygen monitor during the patrol operation mode. An air conditioner comprising a control for starting and ending ventilation operation or / and oxygen-enriched air supply operation. 2. The air conditioner according to claim 1 , further comprising a ventilation function , further comprising an oxygen concentration sensor or a dirt sensor that constantly detects an oxygen concentration or dirt in the indoor air, and the oxygen concentration sensor during operation stop of the air conditioner. Or, when the dirt sensor detects low oxygen concentration or dirt, it has a patrol operation mode that automatically starts ventilation operation and automatically stops ventilation operation when the low oxygen concentration or dirt condition is recovered. Air conditioner to do. 2. The air conditioner according to claim 1 , further comprising an air cleaning function , further including a dirt sensor that constantly detects dirt in indoor air, and automatically detects when the dirt sensor detects dirt while the air conditioner is stopped. An air conditioner characterized by having a patrol operation mode that automatically starts an air cleaning operation and automatically stops the air cleaning operation when a low oxygen concentration or a dirty state is recovered . The air conditioner according to claim 1 , further comprising an air purifying function and a ventilation function , further comprising an oxygen concentration sensor or a dirt sensor that constantly detects the oxygen concentration or dirt in the indoor air, and stopping the operation of the air conditioner When the oxygen concentration sensor or the dirt sensor detects low oxygen concentration or dirt, a plurality of air cleaning operations and ventilation operations are automatically started at the same time, and when the low oxygen concentration or dirt state is recovered, the air cleaning operation is automatically started. And an air conditioner having a patrol operation mode for stopping the ventilation operation . The air conditioner according to any one of claims 1 to 4 , wherein the presence or absence of the patrol operation mode can be selected by a remote control type operation device . The air conditioner according to claim 5, when running patrol operation mode, the air conditioner, which is a possible oxygen enrichment feed operation and selection of the air cleaning operation or ventilating operation by a remote control type operating unit Machine. The air conditioner according to any one of claims 1 to 4, wherein any of the oxygen-enriched air supply function, the ventilation function, and the air purifying function is being executed in the patrol operation mode. And an air conditioner comprising control means for stopping the indoor fan if any of the functions is stopped . The air conditioner according to any one of claims 1 to 4, wherein any of the oxygen-enriched air supply function, the ventilation function, and the air purifying function is being executed during the patrol operation mode. An air conditioner comprising control means for opening an indoor front panel and closing the front panel if any of the functions is stopped . In the air conditioner according to any one of claims 1 to 4, if any one of the oxygen-enriched air supply function, the ventilation function, and the air purification function is being executed during the patrol operation mode, An air conditioner comprising control means for moving the arranged upper and lower blades up and down and closing the upper and lower blades when all of the functions are stopped . In the air conditioner according to any one of claims 1 to 4, if any one of the oxygen-enriched air supply function, the ventilation function, and the air purification function is being executed during the patrol operation mode, An air conditioner comprising control means for operating the left and right blades arranged left and right and stopping the left and right blades if any of the functions is stopped . 5. The air conditioner according to claim 3 , wherein an internal timer that counts the indoor air contamination detection time, an output value of the contamination sensor, and the indoor contamination condition calculated from the internal timer are visually displayed. An air conditioner comprising: a dirt monitor configured to start and end an air cleaning operation based on the dirt monitor during the patrol operation mode . 5. The air conditioner according to claim 2 , wherein an internal timer that counts the indoor air contamination detection time, an output value of the contamination sensor, and the indoor contamination level calculated from the internal timer are visually displayed. An air conditioner comprising: a dirt monitor for performing a ventilation operation based on the dirt monitor during the patrol operation mode .