JP2020115064A - Air conditioner - Google Patents

Abstract

To provide an air conditioner that can complete moist-heat sterilization in the shortest time possible.SOLUTION: An air conditioner includes: a pre-treatment control unit 81b for performing first air blowing operation in order to remove water adhering at a surface of a heat exchanger by driving a blower fan at a first rotation number per minute; a heating control unit 81a for maintaining temperature of the heat exchanger at 55 degrees Celsius or more by performing heating cycle operation while maintaining dew condensation water in a clearance of the heat exchanger after the first air blowing operation; and a post-treatment control unit 81c for performing second air blowing operation in order to lower the temperature of the heat exchanger by driving the blower fan at a second rotation number per minute which is smaller than the first rotation number.SELECTED DRAWING: Figure 6

Description

The present invention relates to an air conditioner that performs moist heat sterilization.

Patent Document 1 discloses an air conditioner. The air conditioner performs internal clean operation after cooling operation. In the internal clean operation, the heating operation is performed after the air blowing operation. A strong wind is set at the start of the blowing operation. The strong wind blows away the water existing inside the indoor unit. Water in the indoor unit is removed according to the heating operation. As disclosed in Patent Document 2, there is proposed an air conditioner that realizes sterilization by moist heat using condensed water formed on the surface of a heat exchanger.

JP, 2009-299983, A Patent No. 6399181

In the moist heat sterilization disclosed in Patent Document 2, a heating cycle operation is performed after the air blowing operation. Here, the heating cycle operation refers to an operation other than the so-called heating operation, which establishes the same circulation of the refrigerant as during the heating operation. However, if the moisture inside the indoor unit is removed in accordance with the heating cycle operation as in Patent Document 1, the heat sterilization by heat cannot be realized.

An object of the present invention is to provide an air conditioner that can surely complete moist heat sterilization.

According to the first aspect of the present invention, an air flow that passes through the heat exchanger is generated according to the rotation of the blower fan, and the indoor unit that blows out the air flow from the air outlet, and the functions of the compressor and the expansion valve, An outdoor unit that supplies a refrigerant to the heat exchanger in a regulated phase state, and a first air-blowing operation that drives the air-blowing fan at a first rotation speed per minute to remove water adhering to the surface of the heat-exchanger. And the pre-treatment control unit for performing the heating cycle operation after maintaining the condensed water in the gap of the heat exchanger after the first blowing operation to maintain the temperature of the heat exchanger at 55 degrees Celsius or higher. A heating control unit and a post-processing control unit that drives the blower fan at a second rotation speed lower than the first rotation speed per minute to perform a second blowing operation to lower the temperature of the heat exchanger. An air conditioner having the same is provided.

When the heat exchanger is maintained at 55 degrees Celsius or higher, the heat sterilization by moist heat is realized. Since the condensed water is maintained during the heating cycle operation, mold and bacteria can be effectively removed in the condensed water. Since the temperature of the heat exchanger is low during the first blowing operation, the skin feeling of the person in the room can be maintained well even if the humidity rises due to the blowing airflow. During the second blowing operation, the heat exchanger reaches a high temperature after the heating cycle operation, but the blowing fan rotates at the second rotation speed lower than the first rotation speed per minute, so the flow rate of the blown airflow is suppressed. As a result, the skin feeling of the person in the room can be favorably maintained.

The air conditioner has a first value that defines the rotation speed of the blower fan corresponding to a first air volume set by a remote controller, and a second air volume that is set by the remote controller and is smaller than the first air volume. A reference table holding a second value defining the rotation speed of the blower fan and a third value defining the rotation speed of the blower fan corresponding to a third air volume set by the remote controller and smaller than the second air volume. May be provided. At this time, the second rotation speed may be set to the second value, and the rotation speed of the blower fan may be set to the third value during the heating cycle operation.

If the air volume is suppressed most during the heating cycle operation, the person in the room is not exposed to the warm air flow. Therefore, the skin feeling of the person in the room can be favorably maintained. During the second blowing operation, if a larger air volume is secured than during the heating cycle operation, drying of the heat exchanger and lowering of the temperature can be promoted. Therefore, the processing time can be shortened. Since the temperature of the blown airflow drops during the second air blowing operation, the skin feeling of the person in the room can be maintained well even if the air volume increases.

Generally, in an air conditioner, the air volume of the indoor unit can be adjusted according to the user's selection. When adjusting the air volume, the rotation speed of the blower fan is preset for each user option. The user's choices are set on the remote control. When the rotation speed set in the remote control is used for the heating operation or the second air blowing operation, the rotation speed does not change from that during normal control. Therefore, when preparing the rotation speed for the heating cycle operation or the second air blowing operation. In comparison, the control can be simplified. The load on the controller can be reduced. Since it is not necessary to add a new numerical value to the reference table, the storage capacity can be saved.

The reference table may hold a fourth value that defines the first rotation speed corresponding to an air volume that is smaller than the first air volume and larger than the second air volume. In this way, the rotation speed different from the user's choice is assigned to the first rotation speed. The rotation speed suitable for the first blowing operation can be set other than the user's choice. In this way, the time of the first blowing operation can be shortened as much as possible. The moist heat sterilization can be completed in the shortest possible time.

The temperature of the heat exchanger may be set to be equal to or lower than a limit temperature that protects the compressor from excessive heating. The heat exchanger is set with a temperature limit that protects the compressor from excessive heating. When the temperature of the heat exchanger exceeds the limit temperature, the operation of the compressor is suppressed (for example, the compressor is stopped). Therefore, when the temperature of the heat exchanger is suppressed below the limit temperature, the operation of the compressor is not suppressed and the heating of the heat exchanger can be favorably maintained. In addition, since the limit temperature is set in the heat exchanger, it is possible to prevent the excessively warm airflow from being blown into the room from the indoor unit. Deterioration of the indoor living environment can be prevented.

As described above, according to the disclosed air conditioner, it is possible to complete the moist heat sterilization as quickly as possible.

It is a conceptual diagram which shows roughly the structure of the air conditioner which concerns on one Embodiment of this invention. It is a perspective view showing roughly the appearance of the indoor unit concerning one embodiment. It is a perspective view which shows the structure of the main body of an indoor unit schematically. It is an exploded perspective view which shows the structure of an indoor unit roughly. It is an expanded vertical sectional view of the main body of an indoor unit. It is a block diagram which shows the structure of a control part roughly. FIG. 3 is an enlarged plan view schematically showing the appearance and display of the remote controller. It is a flow chart which shows a heating sterilization operation roughly. It is a graph which shows the time change of the humidity change rate per minute.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

(1) Configuration of Air Conditioner FIG. 1 schematically shows a configuration of an air conditioner 11 according to an embodiment of the present invention. The air conditioner 11 includes an indoor unit 12 and an outdoor unit 13. The indoor unit 12 is installed in, for example, an indoor space inside a building. In addition, the indoor unit 12 may be installed in a space corresponding to the indoor space. An indoor heat exchanger 14 is incorporated in the indoor unit 12. A compressor 15, an outdoor heat exchanger 16, an expansion valve 17 and a four-way valve 18 are incorporated in the outdoor unit 13. The indoor heat exchanger 14, the compressor 15, the outdoor heat exchanger 16, the expansion valve 17 and the four-way valve 18 form a refrigeration circuit 19. The outdoor unit 13 should just be installed outdoors which can exchange heat with outdoor air.

The refrigeration circuit 19 includes a first circulation path 21. The first circulation path 21 connects the first port 18a and the second port 18b of the four-way valve 18 to each other. A compressor 15 is provided in the first circulation path 21. The suction pipe 15a of the compressor 15 is connected to the first port 18a of the four-way valve 18 via a refrigerant pipe. The gas refrigerant is supplied to the suction pipe 15a of the compressor 15 from the first port 18a. The compressor 15 compresses the low pressure gas refrigerant to a predetermined pressure. The discharge pipe 15b of the compressor 15 is connected to the second port 18b of the four-way valve 18 via a refrigerant pipe. The gas refrigerant is supplied from the discharge pipe 15b of the compressor 15 to the second port 18b of the four-way valve 18. The refrigerant pipe may be, for example, a copper pipe.

The refrigeration circuit 19 further includes a second circulation path 22. The second circulation path 22 connects the third port 18c and the fourth port 18d of the four-way valve 18 to each other. The outdoor heat exchanger 16, the expansion valve 17, and the indoor heat exchanger 14 are incorporated in the second circulation path 22 in order from the third port 18c side. The outdoor heat exchanger 16 exchanges heat energy between the refrigerant passing through the outdoor heat exchanger 16 and the air in contact with the outdoor heat exchanger 16. The indoor heat exchanger 14 exchanges heat energy between the refrigerant passing through the indoor heat exchanger 14 and the air contacting the indoor heat exchanger 14.

A blower fan 23 is incorporated in the outdoor unit 13. The blower fan 23 ventilates the outdoor heat exchanger 16. The blower fan 23 generates an airflow according to the rotation of the impeller, for example. The airflow passes through the outdoor heat exchanger 16 by the function of the blower fan 23. The outdoor air passes through the outdoor heat exchanger 16 and exchanges heat with the refrigerant. The heat-exchanged cold or warm airflow is blown out from the outdoor unit 13. The flow rate of the airflow passing through is adjusted according to the rotation speed of the impeller.

A blower fan 24 is incorporated in the indoor unit 12. The blower fan 24 ventilates the indoor heat exchanger 14. The blower fan 24 generates an airflow according to the rotation of the impeller. The indoor air is sucked into the indoor unit 12 by the function of the blower fan 24. The indoor air passes through the indoor heat exchanger 14 and exchanges heat with the refrigerant. The heat-exchanged cold or warm airflow is blown out from the indoor unit 12. The flow rate of the airflow passing through is adjusted according to the rotation speed of the impeller.

The indoor unit 12 includes vertical airflow direction vanes 25a and 25b. The vertical airflow direction vanes 25 a and 25 b define the direction of the airflow blown out from the indoor unit 12. Details of the structures of the vertical airflow direction vanes 25a and 25b will be described later.

When the cooling operation is performed in the refrigeration circuit 19, the four-way valve 18 connects the second port 18b and the third port 18c to each other and the first port 18a and the fourth port 18d to each other. Therefore, the high-temperature and high-pressure refrigerant is supplied to the outdoor heat exchanger 16 from the discharge pipe 15b of the compressor 15. The refrigerant sequentially flows through the outdoor heat exchanger 16, the expansion valve 17, and the indoor heat exchanger 14. In the outdoor heat exchanger 16, the refrigerant radiates heat to the outside air. The expansion valve 17 reduces the pressure of the refrigerant to a low pressure. The decompressed refrigerant absorbs heat from the ambient air in the indoor heat exchanger 14. Cold air is produced. The cool air is blown into the indoor space by the function of the blower fan 24.

When heating operation is performed in the refrigeration circuit 19, the four-way valve 18 connects the second port 18b and the fourth port 18d to each other and connects the first port 18a and the third port 18c to each other. The high temperature and high pressure refrigerant is supplied from the compressor 15 to the indoor heat exchanger 14. The refrigerant sequentially flows through the indoor heat exchanger 14, the expansion valve 17, and the outdoor heat exchanger 16. The indoor heat exchanger 14 radiates heat from the refrigerant to the surrounding air. Warm air is generated. The warm air is blown into the indoor space by the function of the blower fan 24. The expansion valve 17 reduces the pressure of the refrigerant to a low pressure. The depressurized refrigerant absorbs heat from the ambient air in the outdoor heat exchanger 16. After that, the refrigerant returns to the compressor 15.

The air conditioner 11 includes a temperature sensor 26a and a humidity sensor 26b. The temperature sensor 26a is attached to the indoor heat exchanger 14. The temperature sensor 26a measures the temperature of the indoor heat exchanger 14. The temperature sensor 26a outputs a temperature signal including temperature information of the measured temperature. The humidity sensor 26b is arranged in the indoor unit 12. The humidity sensor 26b measures the relative humidity inside the indoor unit 12. The humidity sensor 26b outputs a humidity signal including humidity information of the measured humidity.

The air conditioner 11 includes a control unit 27. The controller 27 is formed on a control board (not shown) incorporated in the outdoor unit 13, for example. The four-way valve 18, the expansion valve 17, and the compressor 15 in the outdoor unit 13 are electrically connected to the control unit 27 by individual signal lines. Similarly, the control unit 27 is electrically connected to the drive motor of the blower fan 24 in the indoor unit 12, the drive sources of the vertical airflow direction vanes 25a and 25b, the temperature sensor 26a, and the humidity sensor 26b by individual signal lines. .. The control unit 27, based on the temperature signal from the temperature sensor 26a and the humidity signal from the humidity sensor 26b, the four-way valve 18 in the outdoor unit 13, the expansion valve 17, the blower fan 23 and the compressor 15, and the indoor unit 12. The operation of the blower fan 24 is controlled. As a result of such control, as will be described later, the cooling operation, the heating operation, and the heat disinfection operation of the air conditioner 11 are realized.

(2) Configuration of Indoor Unit FIG. 2 schematically shows the appearance of the indoor unit 12 according to the embodiment. An outer panel 28b covers the main body (housing) 28a of the indoor unit 12. An air outlet 29 is formed on the lower surface of the main body 28a. The air outlet 29 opens toward the inside of the room. The main body 28a can be fixed to, for example, a wall surface inside the room. Cold air or warm air is generated in the indoor heat exchanger 14, and the air flow of the cool air or warm air is blown out from the air outlet 29.

A pair of front and rear airflow direction vanes 25a and 25b are arranged at the air outlet 29. The vertical airflow direction vanes 25a and 25b can rotate around rotation axes 32a and 32b, respectively, which are parallel to the longitudinal direction of the main body. The upper and lower wind direction plates 25a and 25b open and close the air outlet 29 according to the rotation. The direction of the blown airflow can be changed according to the angles of the vertical airflow direction vanes 25a and 25b.

As shown in FIG. 3, a suction port 33 is formed in the main body 28a. The suction port 33 opens on the front surface and the upper surface of the main body 28a. The air in the room is taken into the main body 28a through the suction port 33 and is supplied toward the indoor heat exchanger 14.

The air filter assembly 34 is arranged in the suction port 33 in a direction parallel to the rotation axes 32a and 32b. The air filter assembly 34 includes an air filter 35 and a dust box 36. The air filter 35 is held by the dust box 36. The dust box 36 is detachably attached to the main body 28a. When the dust box 36 is set on the main body 28a, the air filter 35 is arranged over the entire surface of the suction port 33.

A front filter rail 38 is formed on the dust box 36. A rear filter rail 39 is formed on the main body 28a so as to correspond to an extension of the front filter rail 38. The filter rails 38, 39 extend along a vertical plane orthogonal to the axes of rotation 32a, 32b. Both left and right ends of the air filter 35 are slidably held by filter rails 38 and 39. The air filter 35 is driven by a second driven gear 52, which will be described later, and moves along the filter rails 38 and 39.

As shown in FIG. 4, the blower fan 24 is rotatably supported by the main body 28a. For example, a cross flow fan is used as the blower fan 24. The blower fan 24 rotates around a rotation axis 41 that is parallel to the rotation axes 32a and 32b. The rotation shaft 41 of the blower fan 24 extends in the horizontal direction when the main body 28a is installed. The blower fan 24 is arranged parallel to the air outlet 29. The driving force around the rotating shaft 41 is transmitted to the blower fan 24 from a driving source (not shown). The drive source is supported by the main body 28a. The airflow passes through the indoor heat exchanger 14 according to the rotation of the blower fan 24. As a result, a cold or warm air stream is generated. The airflow of cold air or warm air is blown out from the air outlet 29.

The indoor heat exchanger 14 includes a front body 14a and a rear body 14b. The front body 14 a faces the blower fan 24 from the front side of the blower fan 24. The rear body 14b faces the blower fan 24 from the rear side of the blower fan 24. The front side body 14a and the rear side body 14b are connected to each other at the upper end as described later. The front body 14a and the rear body 14b have a refrigerant pipe 42a. That is, the refrigerant pipe 42a extends parallel to the rotation axes 32a and 32b, is folded back at the left and right ends of the main body 28a when viewed from the front, again extends parallel to the rotation axes 32a and 32b, and is folded back at the left and right ends of the main body 28a when viewed from the front. , These are repeated. The refrigerant pipe 42 a constitutes a part of the second circulation path 22. A plurality of heat radiation fins 42b are coupled to the refrigerant pipe 42a. The radiating fins 42b are arranged parallel to each other while being orthogonal to the rotation axes 32a and 32b. The refrigerant pipe 42a and the heat radiation fin 42b can be formed of a metal material such as copper or aluminum. Heat exchange is realized between the refrigerant and the air through the refrigerant pipe 42a and the heat radiation fins 42b.

As shown in FIGS. 4 and 5, the air filter assembly 34 includes a filter cleaning unit 43. The dust box 36 serves as one component of the filter cleaning unit 43. The dust box 36 includes an upper dust box 45 and a lower dust box 46. The upper dust box 45 is arranged on the front side of the air filter 35. The upper dust box 45 has a cover 47. The cover 47 opens and closes the storage space 49 of the box body 48. The lower dust box 46 is arranged on the rear surface side of the air filter 35. The upper dust box 45 and the lower dust box 46 sandwich the air filter 35. During cleaning of the air filter 35, dust on the front surface of the air filter 35 is collected in the box body 48 of the upper dust box 45, and dust on the rear surface of the air filter 35 is collected in the lower dust box 46.

The filter cleaning unit 43 includes a first driven gear 51 and a second driven gear 52. The first driven gear 51 is supported by the upper dust box 45. The first driven gear 51 rotates around the horizontal axis 53. The teeth of the first driven gear 51 are partially exposed from the outer surface of the upper dust box 45. Similarly, the second driven gear 52 is supported by the lower dust box 46. The second driven gear 52 rotates around the horizontal axis 54. The second driven gear 52 drives the air filter 35 at both ends of the lower dust box 46. The teeth of the second driven gear 52 are partially exposed from the outer surface of the lower dust box 46. When the air filter assembly 34 is set on the body 28a, the first driven gear 51 meshes with a first drive gear (not shown) mounted on the body 28a, and similarly, the second driven gear 52 is mounted on the body 28a. 2 meshes with a drive gear (not shown). A drive source (not shown) such as an electric motor is individually connected to each drive gear. The first driven gear 51 and the second driven gear 52 rotate individually according to the driving force supplied from each driving source.

As shown in FIG. 5, the filter cleaning unit 43 includes a cleaning brush 56. The cleaning brush 56 is housed in the upper dust box 45. The cleaning brush 56 includes a brush pedestal 57. The brush pedestal 57 can be rotated about the horizontal axis 58 by the driving force from the first driven gear 51. The brush bristles 59 are arranged on the cylindrical surface of the brush base 57 over a predetermined center angle range. The bristle implantation area of the brush bristles 59 has a spread across the air filter 35 in the axial direction of the brush seat 57. The cleaning brush 56 brings the bristles 59 into contact with the air filter 35 at a predetermined rotation position, and detaches the bristles 59 from the air filter 35 at a position other than the rotation position. When the air filter 35 moves in a direction along a vertical plane orthogonal to the rotation axes 32a and 32b while the brush bristles 59 are in contact with the air filter 35, dust attached to the front surface of the air filter 35 is entangled with the brush bristles 59. Can be

The filter cleaning unit 43 includes a brush receiver 61. The brush receiver 61 is housed in the lower dust box 46. The brush receiver 61 has a receiving surface 62. The receiving surface 62 faces the cleaning brush 56. When the brush bristles 59 contact the air filter 35, the receiving surface 62 sandwiches the air filter 35 with the bristles 59. In addition, brush bristles may be planted on the receiving surface 62.

The indoor heat exchanger 14 includes a connecting body 63 that connects the front body 14a and the rear body 14b to each other. The connecting body 63 is coupled to the upper end of the front body 14a and the upper end of the rear body 14b. The connecting body 63 is formed of a metal material having good thermal conductivity such as copper or aluminum. The connecting body 63 is formed at least partially on a plate member that covers the upper ends of the front body 14a and the rear body 14b. When the blower fan 24 rotates, the air flowing from the suction port 33 toward the blower fan 24 is blocked by the connecting body 63 and does not reach the first region 64 of the indoor heat exchanger 14.

The indoor heat exchanger 14 includes a lower body 14c connected to the lower end of the front body 14a. A wind shield 65 such as a plasma clean unit is arranged in front of the gap between the front body 14a and the lower body 14c. The wind shield 65 blocks the air flowing from the front of the main body 28a toward the blower fan 24. When the blower fan 24 rotates, the air flowing from the suction port 33 toward the blower fan 24 is blocked by the wind shield 65 and does not reach the second region 66 of the indoor heat exchanger 14.

The indoor unit 12 of the air conditioner 11 includes a drain pan arranged below the indoor heat exchanger 14. The drain pan includes a first drain pan 67a arranged below the front body 14a and a second drain pan 67b arranged below the rear body 14b. The first drain pan 67a is supported by the main body 28a in front of the blower fan 24. The dew condensation water generated on the surface of the front body 14a flows down to the first drain pan 67a by the action of gravity. The first drain pan 67a gently inclines toward the lowest outlet (not shown). A pipe connected to the outdoor unit 13 is connected to the discharge port. When the blower fan 24 rotates, the air flowing from the suction port 33 toward the blower fan 24 is shielded by the first drain pan 67a and does not reach the third region 68 of the indoor heat exchanger 14.

The second drain pan 67b is supported by the main body 28a behind the blower fan 24. The dew condensation water generated on the surface of the rear body 14b flows down to the second drain pan 67b by the action of gravity. The second drain pan 67b gently inclines toward the discharge port (not shown) at the lowest position. A pipe connected to the outdoor unit 13 is connected to the discharge port. The second drain pan 67b closes the passage of the air flowing from the suction port 33 along the back wall of the main body 28a when the blower fan 24 rotates. Therefore, when the blower fan 24 is rotated, the air flowing in from the suction port 33 along the back wall of the main body 28a cannot pass through, and therefore cannot flow toward the second drain pan 67b, and the fourth heat of the indoor heat exchanger 14 is not generated. I can't reach the area 69.

(3) Configuration of Control System As shown in FIG. 6, the control unit 27 includes a cooling operation unit 78 that manages the operation of the cooling operation, a heating operation unit 79 that manages the operation of the heating operation, and a heat sterilization operation. And a heat sterilization operation unit 81 for managing. The cooling operation unit 78, the heating operation unit 79, and the heat sterilization operation unit 81 include a valve switching control unit 82, an opening control unit 83, a compressor control unit 84, a first blower fan control unit 85, and a second blower fan control unit. The section 86 and the wind direction control section 87 are connected. The valve switching control unit 82 is connected to the four-way valve 18. The valve switching control unit 82 outputs a control signal toward the four-way valve 18. The four-way valve 18 is switched between a first position and a second position according to the received control signal. In the first position, the four-way valve 18 connects the second port 18b and the third port 18c to each other and the first port 18a and the fourth port 18d to each other. In the second position, the four-way valve 18 connects the second port 18b and the fourth port 18d to each other and the first port 18a and the third port 18c to each other. The valve switching control unit 82 generates a control signal that specifies the first position or the second position in response to an instruction from the cooling operation unit 78, the heating operation unit 79, or the heat sterilization operation unit 81.

The opening degree control unit 83 is connected to the expansion valve 17. The opening control unit 83 outputs a control signal to the expansion valve 17. The opening degree of the expansion valve 17 is adjusted according to the received control signal. The control signal specifies the opening degree of the expansion valve 17. When setting the temperature of the indoor heat exchanger 14, adjustment of the opening degree of the expansion valve 17 is used together with control of the compressor 15 described later. The opening degree control unit 83 generates a control signal that specifies the opening degree of the expansion valve 17 in response to an instruction from the cooling operation unit 78, the heating operation unit 79, or the heat sterilization operation unit 81.

The compressor controller 84 is connected to the compressor 15. The compressor controller 84 outputs a control signal to the compressor 15. The operation of the compressor 15 is controlled according to the received control signal. The control signal specifies, for example, the rotation speed of the compressor 15. When setting the temperature of the indoor heat exchanger 14, the operation of the compressor 15 is adjusted together with the opening degree of the expansion valve 17. The compressor control unit 84 generates a control signal that specifies the rotation speed of the compressor 15 in response to an instruction from the cooling operation unit 78, the heating operation unit 79, or the heat sterilization operation unit 81.

The first blower fan controller 85 is connected to the blower fan 23 of the outdoor unit 13. The first blower fan controller 85 outputs a control signal to the blower fan 23. The rotation of the blower fan 23 is controlled according to the received control signal. The control signal switches between rotation and standstill of the blower fan 23, for example. When the blower fan 23 rotates, the control signal specifies the rotation speed of the blower fan 23. The amount of heat energy exchanged by the outdoor heat exchanger 16 is adjusted according to the amount of air based on the rotation of the blower fan 23. The first blower fan control unit 85 generates a control signal that specifies the stop of the operation or the rotation speed of the blower fan 23 in response to an instruction from the cooling operation unit 78, the heating operation unit 79, or the heat disinfection operation unit 81. ..

The second blower fan controller 86 is connected to the blower fan 24 of the indoor unit 12. The second blower fan controller 86 outputs a control signal to the blower fan 24. The rotation of the blower fan 24 is controlled according to the received control signal. The control signal switches between rotation and standstill of the blower fan 24, for example. When the blower fan 24 is rotating, the control signal specifies the rotation speed of the blower fan 24. The amount of heat energy exchanged in the indoor heat exchanger 14 is adjusted according to the air volume based on the rotation of the blower fan 24. The second blower fan control unit 86 generates a control signal that specifies the stop of the operation or the rotation speed of the blower fan 24 in response to an instruction from the cooling operation unit 78, the heating operation unit 79, or the heat disinfection operation unit 81. ..

The wind direction control unit 87 is connected to the vertical wind direction plates 25a and 25b. The wind direction control unit 87 outputs a control signal toward the upper and lower wind direction plates 25a and 25b. The attitudes of the vertical airflow direction vanes 25a and 25b around the rotation axes 32a and 32b are controlled according to the received control signal. The control signal specifies, for example, the angles of the vertical airflow direction vanes 25a and 25b around the rotation axes 32a and 32b. The vertical airflow direction vanes 25a and 25b close the air outlet 33 at the minimum angle. At the maximum angle, the vertical airflow direction vanes 25a and 25b open the air outlet 33 to the maximum extent. The wind direction control unit 87 generates a control signal that specifies the angles of the vertical wind direction plates 25a and 25b in response to an instruction from the cooling operation unit 78, the heating operation unit 79, or the heat sterilization operation unit 81.

The cooling operation unit 78 instructs the valve switching control unit 82 to establish the cooling operation. The cooling operation unit 78 instructs the opening degree control unit 83 and the compressor control unit 84 according to the set temperature during the cooling operation to control the opening degree of the expansion valve 17 and the rotation speed of the compressor 15. The heating operation unit 79 instructs the valve switching control unit 82 to establish the heating operation. The heating operation unit 79 instructs the opening degree control unit 83 and the compressor control unit 84 according to the set temperature during the heating operation to control the opening degree of the expansion valve 17 and the rotation speed of the compressor 15. In this way, the indoor unit 12 generates an air flow of cool air or warm air that passes through the indoor heat exchanger 14 according to the rotation of the blower fan 24, and blows out the air flow of cool air or warm air from the air outlet 29. The outdoor unit 13 supplies the refrigerant to the indoor heat exchanger 14 in the adjusted phase state according to the functions of the compressor 15 and the expansion valve 17.

The heat sterilization operation unit 81 performs a heating cycle operation and maintains the temperature of the indoor heat exchanger 14 at 55 degrees Celsius or higher for a predetermined duration (for example, 10 minutes), and a heating control. A pretreatment control unit 81b that performs a blowing operation (hereinafter referred to as "first blowing operation") prior to the heating cycle operation of the unit 81a, and a blowing operation after the heating cycle operation of the heating control unit 81a (hereinafter referred to as "second blowing operation"). The post-processing control unit 81c for performing the above). During the blow operation, the compressor 15 is set to a rest state. That is, the operation of the compressor 15 is stopped. Here, in the heating cycle operation, the same circulation of refrigerant is established in the refrigeration circuit 19 as in the heating operation. A temperature sensor 26a and a humidity sensor 26b are connected to the heat sterilization operation unit 81. The temperature sensor 26a and the humidity sensor 26b may be combined with the sensors used for the cooling operation or the heating operation of the air conditioner 11.

Here, the heat sterilization operation unit 81 sets a limit temperature determined corresponding to the upper limit temperature of the operating temperature range of the compressor 15. The compressor 15 is set with an operating temperature range that guarantees the operation of the compressor 15. When the temperature of the compressor 15 is maintained below the upper limit temperature of the operating temperature range, the operation of the compressor 15 is reliably ensured. When the operation of the compressor 15 is suppressed during the heating operation, the temperature rise of the compressor 15 can be avoided. Here, in the air conditioner 11, the temperature of the indoor heat exchanger 14 is used to control the temperature of the compressor 15. The temperature of the indoor heat exchanger 14 is detected by the temperature sensor 26a. When the temperature of the indoor heat exchanger 14 exceeds the limit temperature, the heat sterilization operation unit 81 suppresses the operation of the compressor 15. The heat sterilization operation unit 81 may stop the operation of the compressor 15. In this way, the compressor 15 is protected. The limit temperature is set to 59 degrees Celsius, for example.

A reference table 88 is connected to the second blower fan control unit 86. In the reference table 88, a first value 88a that defines the number of revolutions per minute of the blower fan 24, a second value 88b that defines the number of revolutions per minute of the blower fan 24 that is smaller than the first value 88a, and a second value 88b. A third value 88c that defines the rotation speed per minute of the blower fan 24 that is smaller than the binary value 88b, and a rotation speed per minute of the blower fan 24 that is smaller than the first value 88a and larger than the second value 88b. The fourth value 88d is held. When the blower fan 24 rotates at the rotation speed of the first value 88a, the airflow having the first air volume is blown out from the air outlet 29. When the blower fan 24 rotates at the rotation speed of the second value 88b, the airflow of the second air volume smaller than the first air volume is blown out from the air outlet 29. When the blower fan 24 rotates at the rotation speed of the third value 88c, an airflow having a third air volume smaller than the second air volume is blown out from the air outlet 29. When the blower fan 24 rotates at the rotation speed of the fourth value 88d, an air flow having a smaller air flow than the first air flow and larger than the second air flow is blown out from the air outlet 29. The reference table 88 may be constructed in a storage medium such as a memory. Here, the fifth value 88e that defines the number of revolutions per minute of the blower fan 24 that is smaller than the third value 88c is held in the reference table 88. When the blower fan 24 rotates at the rotation speed of the fifth value 88e, an airflow having a smaller air volume than the third air volume is blown out from the air outlet 29.

In the reference table 88, a first time value 89a that specifies the blowing time of the heating cycle operation performed by the heating control unit 81a and a first time value 89a that specifies the blowing time of the first blowing operation performed by the pretreatment control unit 81b. The 2 hour value 89b and the 3rd time value 89c that specifies the blowing time of the second blowing operation performed by the post-processing control unit 81c are held. Here, 1st value 88a-5th value 88e and 1st time value 89a-3rd time value 89c are each specified by one fixed value.

The control unit 27 includes a timer 91 connected to the cooling operation unit 78, the heating operation unit 79, and the heat sterilization operation unit 81. The timer 91 clocks in accordance with an instruction from the cooling operation unit 78, the heating operation unit 79, or the heat sterilization operation unit 81. The operation time of the cooling operation or the heating operation, the heating cycle operation time of the heating control unit 81a, the blowing time of the pretreatment control unit 81b, and the blowing time of the posttreatment control unit 81c are measured. The timer 91 outputs a clock signal to the heat disinfection operation unit 81. The timekeeping signal specifies the value of the timed time. The heat sterilization operation unit 81 controls the operation of the valve switching control unit 82, the operation of the compressor control unit 84, and the operation of the second blower fan control unit 86 according to the value of the measured time.

The control unit 27 includes a receiving unit 92 connected to the cooling operation unit 78, the heating operation unit 79, and the heat sterilization operation unit 81. The receiver 92 communicates with a remote controller (operation unit) 93. Optical signals and radio waves are used for communication. The remote controller 93 is arranged in the indoor space and sends an operation signal to the indoor unit 12.

As shown in FIG. 7, the remote controller 93 includes an operation button group 95 and a display panel 96 embedded in the surface of the housing 94. The operation button group 95 includes “menu” button 95a, “enter” button 95b, “return” button 95c, “cooling” button 95d, “heating” button 95e, “dehumidification” button 95f, and “stop” button 95g. including. When each operation button is operated, an electric signal specific to each operation button 95a to 95g is output. The electric signal is converted into an optical signal or a radio wave by the transmitting circuit and transmitted to the receiving section 92 of the indoor unit 12.

The display panel 96 displays the types of driving operations such as "automatic", "cooling", "heating", "dehumidifying", and "blowing" according to the instruction of the drawing circuit and the set temperature, and also responds to the operation of the "menu" button 95a. A menu list (icon) is displayed. By selecting with the “OK” button 95b from the options displayed in the menu list, execution or non-execution can be determined for other operations including the heat sterilization operation. For example, when the “menu” button 95a is operated during the cooling operation or the heating operation, the menu list 97 is displayed on the display panel 96 as shown in FIG. 7B. When "air volume" is selected according to the operation of the "OK" button 95b, a list 98 of "air volume" is displayed as shown in FIG. 7C. The user can select a desired air volume by operating the “Enter” button 95b. For example, when “strong wind” is selected, the second blower fan control unit 86 acquires the first value 88a from the reference table 88. The second blower fan control unit 86 controls the operation of the blower fan 24 according to the first value 88a. Similarly, when "weak wind" is selected, the second value 88b is acquired. When “light breeze” is selected, the third value 88c is acquired. When “quiet” is selected, the fifth value 88e is acquired. Similarly, the user can select "heat sterilization" from the menu list. When "heat sterilization" is selected by the remote controller 93, the controller 27 carries out the heat sterilization operation.

(4) Heat disinfection operation Next, the heat disinfection operation performed in the air conditioner 11 will be described. If the cooling operation is performed in the air conditioner 11 prior to the start of the heat sterilization operation, the temperature in the indoor unit 12 decreases as compared to room temperature. Therefore, the temperature of the indoor unit 12 varies depending on the humidity in the indoor space. Condensation occurs in the case. At this time, since the radiating fins 42b are arranged at intervals that cause the capillarity of the condensed water in accordance with the surface tension, the condensed water collects in the gap between the radiating fins 42b. Condensed water partially flows down from the indoor heat exchanger 14 to the first and second drain pans 67a and 67b by the action of the airflow and the gravity caused by the rotation of the blower fan 24.

The heat sterilization operation is started, for example, in response to a user's remote control operation. The user displays the menu list on the display panel 96 of the remote controller 93 based on the operation of the "menu" button 95a. The user selects "heat sterilization" from the menu list. A radio wave for specifying "heat sterilization" is transmitted from the remote controller 93 to the receiving unit 92 of the indoor unit 12. The heat sterilization operation unit 81 starts the heat sterilization operation in response to the reception of the "heat sterilization" signal. Prior to the heat sterilization operation, the cooling operation unit 78 ends the cooling operation.

As shown in FIG. 8, when the heat sterilization operation is started, in step S1, the pretreatment control unit 81b performs the first blowing operation. The preprocessing control unit 81b acquires the fourth value 88d and the second time value 89b from the reference table 88 in the first blowing operation. The preprocessing control unit 81b stops the operation of the compressor 15. The pre-processing control unit 81b controls the operation of the blower fan 24 through the second blower fan control unit 86 based on the fourth value 88d and the second time value 89b. The preprocessing control unit 81b may use, for example, the timer 91 when measuring the second time value 89b. In the first region 64, the second region 66, the third region 68, and the fourth region 69, since the air flow does not pass, the condensed water remains in the gap between the heat radiation fins 42b. Water adhering to the surface of the radiation fin 42b other than the gap is removed.

When the first blowing operation ends, the heating control unit 81a performs the heating cycle operation in step S2. In the heating cycle operation, the heating control unit 81a acquires the third value 88c and the first time value 89a from the reference table 88. The heating control unit 81a controls the operations of the four-way valve 18, the expansion valve 17 and the compressor 15 through the valve switching control unit 82, the opening control unit 83 and the compressor control unit 84 to establish the heating operation. In the heating cycle operation, the heating control unit 81a controls the operation of the blower fan 24 through the second blower fan control unit 86 based on the third value 88c and the first time value 89a. The heating control unit 81a may use, for example, a timer 91 when measuring the first time value 89a.

When the heating cycle operation ends, in step S3, the post-processing control unit 81c performs the second blowing operation. In the second blowing operation, the post-processing control unit 81c acquires the second value 88b and the third time value 89c from the reference table 88. The post-processing control unit 81c stops the operation of the compressor 15. The post-processing control unit 81c controls the operation of the blower fan 24 through the second blower fan control unit 86 based on the second value 88b and the third time value 89c. The post-processing control unit 81c may use, for example, the timer 91 when measuring the third time value 89c.

The heating control unit 81a maintains the temperature of the indoor heat exchanger 14 at 55 degrees Celsius or higher for a predetermined duration (=first time value 89a). Since it is desired to shorten the time for the heat sterilization operation, the first time value 89a is set to the minimum time at which mold and bacteria (for example, Escherichia coli) die at 90% or more. Here, the minimum time is set to 5 [min] based on the known experimental result. From the viewpoint of protecting the compressor 15, the temperature of the indoor heat exchanger 14 is set to 59 degrees Celsius or less.

In the first blowing operation, the fourth value 88d and the second time value 89b are set to values that allow dew condensation water to be maintained in the gaps of the indoor heat exchanger 14 during the heating cycle operation of the heating controller 81a. Therefore, in the first blowing operation, the dew condensation water remains in the gap of the indoor heat exchanger 14 in the amount of water that maintains the dew condensation water in the gap of the indoor heat exchanger 14 during the heating cycle operation of the heating control unit 81a. Water adhering to the surface of the heat radiation fin 42b is removed. In the indoor heat exchanger 14, the evaporation of the dew condensation water is suppressed in the areas where the air flow does not pass, such as the above-mentioned first area 64, the second area 66, the third area 68, and the fourth area 69. By adjusting the areas of the first region 64, the second region 66, the third region 68, and the fourth region 69 at the stage, the amount of remaining condensed water can be adjusted.

In the second blowing operation, the second value 88b and the third time value 89c are set to values at least capable of cooling the indoor heat exchanger 14 after the heating cycle operation. Desirably, the indoor heat exchanger 14 is cooled to room temperature. Here, the condensed water remaining in the indoor heat exchanger 14 is vaporized according to the second blowing operation. The surface of the indoor heat exchanger 14 dries.

In the present embodiment, since the dew condensation water is maintained during the heating cycle operation of the heat sterilization operation, if the indoor heat exchanger 14 is maintained at 55 degrees Celsius or higher, the wet heat sterilization is realized. Molds and bacteria are effectively eradicated in dew water. Mold growth is deterred. Moreover, since the air blowing operation is performed prior to the heating cycle operation, the increase in humidity is suppressed in the blowing airflow at the start of the heating cycle operation. As a result, the occupants do not have to touch the warm moist air. The skin feeling of the occupants is maintained well. On the other hand, if the first blowing operation is excessively continued, the dew condensation water evaporates from the gap of the indoor heat exchanger 14, and a sufficient sterilizing effect cannot be realized during the heating cycle operation. On the contrary, if the surface of the indoor heat exchanger 14 is not sufficiently dried during the first air blowing operation, the humidity of the airflow blown out at the start of the heating cycle operation remarkably increases, and the skin feeling of the person in the room deteriorates.

The post-treatment control unit 81 according to the present embodiment performs the second air blowing operation after the heating cycle operation of the heat disinfection operation to cool the indoor heat exchanger 14 and remove the condensed water from the gap of the indoor heat exchanger 14. Vaporize. In this way, the inside of the indoor unit 12 is dried, so that the growth of mold is suppressed (prevented).

The indoor heat exchanger 14 is set with a limit temperature that protects the compressor 15 from excessive heating. When the temperature of the indoor heat exchanger 14 exceeds the limit temperature, the operation of the compressor 15 is suppressed. Therefore, when the temperature of the indoor heat exchanger 14 is suppressed below the limit temperature, the operation of the compressor 15 is not suppressed and the heating of the indoor heat exchanger 14 is maintained well. In addition, since the limit temperature is set in the indoor heat exchanger 14, it is possible to prevent the excessively warm airflow from being blown into the room from the indoor unit 12. Deterioration of the indoor living environment can be prevented.

The pre-processing control unit 81a according to the present embodiment has a reference table 88 that defines one rotation speed and the rotation time per minute of the blower fan 24 in the first blower operation with one fixed value. The condensed water flows down along the surface of the indoor heat exchanger 14 due to the action of gravity. Therefore, the amount of water attached to the surface of the indoor heat exchanger 14 can be estimated in advance. The number of revolutions of the blower fan 24 per minute and the blowing time can be specified based on the amount of water assumed in advance. In this way, the processing operation of the preprocessing control unit 81a is simplified.

In the present embodiment, during the second blowing operation, the indoor heat exchanger 14 reaches a high temperature after the heating cycle operation, but the blower fan 24 rotates the rotation speed during the first blowing operation per minute (the rotation of the fourth value 88d) per minute. Since the number of rotations is smaller than the number of rotations (the number of rotations of the third value 88c), the flow rate of the blown airflow is suppressed, and as a result, the sensation of the person in the room is kept good. Since the indoor heat exchanger 14 is cooled in the second blowing operation, the cooling operation can be started in a short time even when the cooling operation is subsequently performed.

If the air volume is suppressed most during the heating cycle operation in the heat disinfection operation, the person in the room is not exposed to the warm air flow. Therefore, the skin feeling of the person in the room is maintained well. During the second blowing operation, if a larger air volume is secured than during the heating cycle operation, the drying of the indoor heat exchanger 14 and the temperature decrease are promoted. Therefore, the processing time is shortened. Since the temperature of the blown airflow drops during the second air blowing operation, the skin feeling of the person in the room can be maintained well even if the air volume increases.

In the cooling operation of the cooling operation unit 78 and the heating operation of the heating operation unit 79, the air volume of the indoor unit 12 can be adjusted according to the user's selection. When adjusting the air volume, the rotation speed of the blower fan 24 is preset for each user option. The user's options are set on the remote controller 93. When the rotation speed set in the remote controller 93 is used in the heating cycle operation of the heat sterilization operation or the second air blowing operation, the rotation speed does not change from that in the normal control, so that the control can be simplified. The load on the control unit 27 is reduced. Since it is not necessary to add a new numerical value to the reference table 88, the storage capacity can be saved.

In the present embodiment, in the first blowing operation, the rotation speed of the blower fan 24 is set to a fourth value that defines the rotation speed corresponding to an air volume that is smaller than “strong wind” and larger than “weak wind”. In this way, the number of rotations different from the user's choice is allocated in the first blowing operation. The rotation speed suitable for the first blowing operation can be set other than the user's choice. In this way, the time of the first blowing operation can be shortened as much as possible. The heat sterilization operation can be completed in the shortest possible time. However, in the first air blowing operation, the pretreatment control unit 81b may be set to the first value corresponding to “strong air” that is larger than the “weak air” in the second air blowing operation. In this way, when the rotation speed set in the remote controller 93 is used in the first blowing operation, the rotation speed does not change from that in the normal control, so that the control can be simplified.

In setting the fourth value 88d and the second time value 89b of the first blowing operation, for example, the rate of change in humidity per minute in the blowing airflow may be referred to. The present inventor measured the rate of change in humidity per minute for each elapsed time during the first blowing operation and the heating cycle operation. The air conditioner 11 was installed in the laboratory for the measurement. Relative humidity was measured every minute in the laboratory. In the first blowing operation, the blowing amount was set to "weak air" based on the second value 88b. In the heating cycle operation, the air flow rate was set to "light wind" based on the third value 88c.

As shown by the solid line in FIG. 9, when the first air blowing operation is continued for a specific operation time, the rate of change in humidity per minute in the blown airflow shows a peak value 101 and then falls within a predetermined range. It was found to converge. After that, when the heating cycle operation was carried out subsequent to the first blowing operation, the humidity change rate per minute in the blowout airflow showed a peak value 102 again with the start of the heating cycle operation. Thus, it was confirmed that the peak values 101 and 102 were dispersed during the first blowing operation and the heating cycle operation. On the other hand, when the first air blowing operation is not continued until the peak value 101 appears in the first air blowing operation and the first air blowing operation is switched to the heating cycle operation, the heating cycle operation is performed as shown by the dotted line in FIG. 9. The peak value 103, which is larger than either of the peak values 101 and 102, appeared with the start of the. Such an increase in the rate of change in humidity per minute deteriorates the skin feeling of the occupants, and thus the reduction of the peak value leads to the comfort of the occupants. That is, if the first air blowing operation is performed until the rate of change in humidity per minute in the blowing air flow shows a peak value 101 and then converges to a value within a predetermined range, even if the heating cycle operation is subsequently performed. The increase in humidity due to the heating cycle operation is suppressed. Therefore, the skin feeling of the person in the room is maintained well. On the other hand, if the heating cycle operation is started after the rate of change in humidity per minute shows a peak value and before the rate of change in humidity falls within a predetermined range, the rate of change in humidity per minute becomes any of the peak values 101, 102. Significantly more than. Here, when the humidity change rate per minute in the blowout airflow shows a peak value 101 and then the humidity change rate per minute converges within ±1.0%, the heating control unit 81a causes the first ventilation operation to start the heating cycle. Switch to operation.

In the heating cycle operation of the heat disinfection operation, it is not necessary to maintain the condensed water in the indoor heat exchanger 14 for the entire period of the heating cycle operation as described above, and the indoor heat exchanger is kept at 55 degrees Celsius or higher for a predetermined duration. It suffices that the temperature of the heat exchanger 14 be maintained and the condensed water be maintained in the indoor heat exchanger 14. In this case, the number of revolutions per minute and the blowing time of the blower fan 24 are not specified by one fixed value, but the blowing fan 24 blows air according to the amount of dew condensation water generated in the indoor heat exchanger 14 during the cooling operation. The number of revolutions per minute and the blowing time of the fan 24 may be determined. For example, the pretreatment control unit 81b can determine the rotation speed of the blower fan 24 based on the operating time of the cooling operation. Since the amount of dew condensation water generated in the indoor heat exchanger 14 depends on the operating time of the cooling operation, the number of rotations of the blower fan 24 during the blowing operation depends on the operating time of the cooling operation timed by the control unit 27. If determined, the optimum degree of wetness can be established in the indoor heat exchanger 14 at the end of the blowing operation.

In this way, since the rotation speed of the blower fan 24 is determined according to the amount of dew condensation water during the first air blowing operation, the indoor heat exchanger 14 can establish an optimum wet condition for maintaining dew condensation water. Therefore, the blowing operation time can be shortened. If the first blowing operation is continued excessively, the dew condensation water will evaporate from the indoor heat exchanger 14, and a sufficient sterilization effect will not be realized during the heating cycle operation of the heat sterilization operation. On the contrary, if the surface of the indoor heat exchanger 14 is not sufficiently dried during the first air blowing operation, the humidity of the airflow blown out at the start of the heating cycle operation remarkably increases, and the skin feeling of the person in the room deteriorates.

The preprocessing control unit 81b may determine the rotation speed of the blower fan 24 based on the humidity detected by the humidity sensor 26b. Since the amount of dew condensation water generated in the indoor heat exchanger 14 depends on the humidity in the indoor unit 12, the rotation speed of the blower fan 24 during the first blowing operation is determined according to the measurement value of the humidity sensor 26b. For example, at the end of the first blowing operation, the indoor heat exchanger 14 can establish the optimum wet condition.

11... Air conditioner, 12... Indoor unit, 13... Outdoor unit, 14... Heat exchanger (indoor heat exchanger), 15... Compressor, 17... Expansion valve, 24... (Indoor unit) fan, 29... Air outlet, 81a... Heating controller, 81b... Pretreatment controller, 81c... Posttreatment controller, 88... Reference table.

Claims (4)

An indoor unit that generates an airflow that passes through the heat exchanger according to the rotation of the blower fan and blows out the airflow from the air outlet,
An outdoor unit that supplies refrigerant to the heat exchanger in a regulated phase state according to the functions of the compressor and the expansion valve,
A pretreatment control unit that drives the blower fan at a first rotation speed per minute to perform a first blower operation to remove water adhering to the surface of the heat exchanger;
A heating control unit that performs a heating cycle operation while maintaining dew condensation water in the gap of the heat exchanger after the first blowing operation and maintains the temperature of the heat exchanger at 55 degrees Celsius or higher,
A post-processing control unit that drives the blower fan at a second rotation speed that is lower than the first rotation speed per minute to perform a second blowing operation that lowers the temperature of the heat exchanger;
An air conditioner comprising: The air conditioner according to claim 1, wherein a first value that defines a rotation speed of the blower fan corresponding to a first air volume set by a remote controller, and a second value that is set by the remote controller and is smaller than the first air volume. A second value defining the rotation speed of the blower fan according to the air volume, and a third value defining the rotation speed of the blower fan corresponding to the third air volume set by the remote controller and smaller than the second air volume. With a lookup table to hold the values,
The air conditioner, wherein the second rotation speed is set to the second value, and the rotation speed of the blower fan is set to the third value during the heating cycle operation. The air conditioner according to claim 2, wherein the reference table holds a fourth value that defines the first rotation speed corresponding to an air volume that is smaller than the first air volume and larger than the second air volume. An air conditioner characterized by. The air conditioner according to any one of claims 1 to 3, wherein the temperature of the heat exchanger is set to a temperature equal to or lower than a limit temperature for protecting the compressor from excessive heating. Machine.

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