JP2020029990A - Air conditioner - Google Patents

Abstract

To provide an air conditioner capable of promptly responding to even a case where an air conditioning load in a room is changed while preventing hunting of a room temperature due to frequent occurrence of a thermo-off state.SOLUTION: In an air conditioner, a compressor is thermostatically turned off when a temperature difference between a room temperature and a preset temperature reaches a first threshold value, and after the compressor is thermostatically turned off, when the temperature difference between the room temperature and the preset temperature reaches a second threshold value, the compressor is thermostatically turned on. In the air conditioner, an upper limit value of rotational frequency of the compressor is set when a thermo-off state occurs as rotational frequency regulation control of the compressor after the thermo-off state occurs (S2), and after a first predetermined time elapses after the thermo-off state occurs (Yes in S3), the setting of the upper limit value of the rotational frequency of the compressor is cancelled (S4).SELECTED DRAWING: Figure 3

Description

  The present invention relates to an air conditioner.

  2. Description of the Related Art Conventionally, in an air conditioner, operation control for changing the rotation speed of a compressor according to a temperature difference between a room temperature and a set temperature has been performed. Specifically, operation control is performed to increase the rotation speed of the compressor when the temperature difference between the room temperature and the set temperature is large, and to decrease the rotation speed of the compressor when the temperature difference between the room temperature and the set temperature is small. In such control, when the temperature difference between the room temperature and the set temperature is large, the room temperature is quickly brought close to the set temperature by increasing the operation capability of the air conditioner, and when the temperature difference between the room temperature and the set temperature is small, The aim is to maintain the room temperature near the set temperature by lowering the operation capacity of the harmonic machine.

  However, control that only changes the rotation speed of the compressor according to the temperature difference between the room temperature and the set temperature may not be sufficient. That is, even when the room temperature is close to the set temperature and the rotational speed of the compressor is reduced to the lowest, the capacity of the air conditioner may be too high and the room temperature may continue to fluctuate beyond the set temperature ( For example, during the cooling operation, the room temperature keeps decreasing at a temperature lower than the set temperature.

  Thermo-OFF is a control for avoiding such a problem. That is, when the room temperature continues to fluctuate beyond the set temperature even when the rotation speed of the compressor is lowered to the lowest, the operation of the compressor is temporarily stopped (thermo OFF).

  Patent Literature 1 discloses that a limit is set so that the operating frequency of a compressor does not exceed a predetermined frequency until a predetermined time elapses after the compressor restarts operation from thermo-OFF (thermo-ON). Is disclosed. Such a limitation of the operating frequency (rotation speed) of the compressor after the return from the thermo-OFF is performed in order to prevent the occurrence of hunting at room temperature due to repeated occurrence of the thermo-OFF in a short time.

  That is, once the compressor is stopped by the thermo-OFF, the compressor cannot be restarted for a certain period of time (about 3 minutes) to ensure the reliability of the compressor. Since the temperature difference between the room temperature and the set room temperature increases while the compressor is stopped, the rotational speed of the compressor according to the temperature difference may be too high when the thermostat is turned on after the elapse of the predetermined time. At this time, by regulating the number of revolutions of the compressor, the change speed of the room temperature can be reduced, and the thermo-ON time until thermo-OFF occurs again can be lengthened.

Japanese Patent No. 04415817

  However, in the control of Patent Document 1, the operation according to the air conditioning load of the room cannot be performed during the regulation of the number of rotations of the compressor after the return from the thermo-OFF. In other words, there is a problem that during the regulation of the number of rotations of the compressor, even if an air conditioning load increases due to a person entering or exiting the room or opening / closing a window, it is not possible to quickly respond to this change.

  In particular, in a room with good heat insulation performance, the thermo-OFF time is long and the temperature difference between the room temperature and the set temperature gradually increases, so that the number of revolutions according to the temperature difference when the thermo-ON is too high. There is no need to regulate the number of revolutions of the compressor. In this case, the regulation time of the rotational speed of the compressor becomes longer than necessary, and during this time, the response of the cooling and heating capacity to the fluctuation of the air conditioning load is delayed.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide an air conditioner capable of promptly responding to a change in the air conditioning load of a room while preventing room temperature hunting due to frequent thermo-OFF. Aim.

  In order to solve the above problem, an air conditioner according to a first aspect of the present invention thermostats a compressor when a temperature difference between a room temperature and a set temperature reaches a first threshold value. An air conditioner that turns on the compressor when the temperature difference between the temperature and the set temperature reaches a second threshold value. When the thermo-off occurs, an upper limit value is set for the rotation speed of the compressor, and the thermo-off is set. The setting of the upper limit value is canceled after a lapse of a first predetermined time from.

  According to the above configuration, by performing the rotation speed regulation control after the thermo-OFF until the first predetermined time elapses from the thermo-off, the time for receiving the rotation speed regulation control after the thermo-ON is reduced depending on the use environment of the air conditioner. Accordingly, appropriate control according to the use environment of the air conditioner can be performed. For example, in an environment where the room temperature fluctuation after the thermo-OFF is large and the time until the thermo-on is short, it is possible to lengthen the time to be subjected to the rotation speed regulation control after the thermo-on, and to perform the operation with an emphasis on preventing hunting at room temperature. it can. On the other hand, in an environment in which the room temperature fluctuation after the thermo-OFF is small and the time until the thermo-on is long, the time to be subjected to the rotation speed regulation control after the thermo-on is shortened, and the response to the fluctuation of the air conditioning load of the room is reduced. Enhanced operation can be performed.

  In order to solve the above-described problem, an air conditioner according to a second aspect of the present invention thermostats a compressor when a temperature difference between a room temperature and a set temperature reaches a first threshold value. An air conditioner that turns on the compressor when the temperature difference between the temperature and the set temperature reaches a second threshold value. When the thermo-off occurs, an upper limit value is set for the rotation speed of the compressor, and the thermo-off is set. When the temperature difference between the room temperature and the set temperature later becomes equal to or more than a third threshold value larger than the second threshold value, the setting of the upper limit is canceled.

  According to the above configuration, as long as there is no large change in the air conditioning load after the thermo-ON and the temperature difference between the room temperature and the set temperature does not exceed the third threshold, the upper limit value is set for the rotation speed of the compressor. It is possible to perform an operation that emphasizes prevention of hunting at room temperature. On the other hand, when a large change in the air-conditioning load occurs after the thermo-ON and the temperature difference between the room temperature and the set temperature exceeds the third threshold, the upper limit value of the number of revolutions of the compressor is released, thereby controlling the air-conditioning of the room. It can respond to load fluctuations.

  In order to solve the above-mentioned problem, an air conditioner according to a third aspect of the present invention thermostats a compressor when a temperature difference between room temperature and a set temperature reaches a first threshold, and sets the room temperature after the thermostat is turned off. An air conditioner that turns on the compressor when the temperature difference between the temperature and the set temperature reaches a second threshold value. When the thermo-off occurs, an upper limit value is set for the rotation speed of the compressor, and the thermo-off is set. After that, the temperature difference between the room temperature and the set temperature becomes equal to or more than a third threshold value larger than the second threshold value, or the setting of the upper limit value is canceled after a lapse of a first predetermined time from the thermo OFF. I have.

  According to the configuration described above, when a large change in the air conditioning load occurs after the thermo-ON is performed and the temperature difference between the room temperature and the set temperature exceeds the third threshold, the upper limit value of the rotation speed of the compressor is released. It can respond to fluctuations in the air conditioning load in the room. On the other hand, even if the temperature difference between the room temperature and the set temperature does not exceed the third threshold value, the upper limit value setting is released after the first predetermined time has elapsed from the thermo-OFF, so that the air conditioning load may change thereafter. Responsiveness can be improved.

  Further, in the air conditioner, the upper limit value is changed in accordance with the outside air temperature.In cooling, the lower limit is set to a lower value as the outside air temperature is lower. The configuration may be such that the higher the temperature, the lower the upper limit is set.

  According to the above configuration, the upper limit value of the rotation speed is set to a lower value in a state where the thermo-OFF is more likely to occur, and the regulation of the rotation speed of the compressor is strengthened, so that the frequent occurrence of the thermo-off can be suppressed. Further, in a state where thermo-OFF does not easily occur, the regulation of the number of revolutions of the compressor is weakened, and the responsiveness to the fluctuation of the air conditioning load can be improved.

  ADVANTAGE OF THE INVENTION The air conditioner of this invention has the effect of being able to respond promptly even when the air conditioning load of the room fluctuates, while preventing room temperature hunting due to frequent thermo-OFF.

FIG. 1 is a schematic configuration diagram of an air conditioner according to Embodiment 1. FIG. 3 is a block diagram showing a control system of the air conditioner according to Embodiment 1. 4 is a flowchart illustrating rotation speed regulation control of the air conditioner according to Embodiment 1. 9 is a flowchart illustrating rotation speed regulation control of the air conditioner according to Embodiment 2. 9 is a flowchart illustrating rotation speed regulation control of the air conditioner according to Embodiment 3.

[Embodiment 1]
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an air conditioner 10 according to Embodiment 1 and shows a refrigeration cycle applied to the air conditioner 10.

  The air conditioner 10 includes an indoor unit 100 and an outdoor unit 110. On the path of the refrigeration cycle in the air conditioner 10, an indoor heat exchanger 101 is provided on the indoor unit 100 side, and a compressor 111, an outdoor heat exchanger 112, a four-way valve 113 and an expansion valve are provided on the outdoor unit 110 side. 114 are provided. Further, the indoor unit 100 is provided with an indoor fan 102 for sending out the air heat exchanged by the indoor heat exchanger 101 into the room, and the outdoor unit 110 is for sending air to the outdoor heat exchanger 112. Outdoor fan 115 is provided.

  The four-way valve 113 switches the direction of circulation of the refrigerant according to the heating / cooling operation of the air conditioner 10 (FIG. 1 shows a state during the heating operation). During the heating operation, the refrigerant circulates in the order of the compressor 111, the four-way valve 113, the indoor heat exchanger 101, the expansion valve 114, the outdoor heat exchanger 112, the four-way valve 113, and the compressor 111. That is, during the heating operation, the indoor heat exchanger 101 functions as a condenser, and the outdoor heat exchanger 112 functions as an evaporator.

  On the other hand, during the cooling operation, the refrigerant circulates in the order of the compressor 111, the four-way valve 113, the outdoor heat exchanger 112, the expansion valve 114, the indoor heat exchanger 101, the four-way valve 113, and the compressor 111. That is, during the cooling operation, the outdoor heat exchanger 112 functions as a condenser, and the indoor heat exchanger 101 functions as an evaporator.

  Further, the air conditioner 10 has a room temperature sensor 121 near the indoor heat exchanger 101. The room temperature sensor 121 detects the temperature of the intake air in the indoor heat exchanger 101 as room temperature. The air conditioner 10 has various sensors for controlling the air conditioner 10 in addition to the room temperature sensor 121. Here, illustration and description of sensors other than the outside air temperature sensor 122 described later are given. Is omitted. The outside air temperature sensor 122 is disposed near the outdoor heat exchanger 112 and detects the temperature of the intake air in the outdoor heat exchanger 112 as the outside air temperature.

  FIG. 2 is a block diagram illustrating a control system of the air conditioner 10. However, FIG. 2 shows only a configuration related to the control of the rotation speed of the compressor 111 based on the room temperature. The air conditioner 10 controls the rotation speed of the compressor 111 by the control unit 20, and the control unit 20 includes a main control unit 201, a timer 202, and a temperature difference-rotation speed table 203. Further, the main control unit 201 is also connected to the compressor 111 and the room temperature sensor 121.

  The air conditioner 10 performs, as basic control of the compressor 111, operation control of changing the number of revolutions of the compressor according to a temperature difference between room temperature and a set temperature. In this operation control, the current room temperature detected by the room temperature sensor 121 is input to the main control unit 201, and the main control unit 201 obtains a temperature difference between the room temperature and the set temperature. Further, the main control unit 201 obtains the required rotation speed of the compressor 111 using the temperature difference as an input parameter to the temperature difference-rotation speed table 203, and sets the compressor rotation speed so that the rotation speed of the compressor 111 becomes the required rotation speed. 111 is controlled. That is, the temperature difference-rotation speed table 203 stores the temperature difference between the room temperature and the set temperature in association with the required rotation speed of the compressor 111.

  With the above operation control using the temperature difference-rotational speed table 203, in the air conditioner 10, when the temperature difference between the room temperature and the set temperature is large, the room temperature is quickly brought to the set temperature by increasing the operation capability of the air conditioner. When the temperature difference between the room temperature and the set temperature is small, the room temperature is maintained near the set temperature by reducing the operation capacity of the air conditioner.

  Further, even when the room temperature is close to the set temperature and the rotation speed of the compressor 111 is reduced to the lowest, the air conditioner 10 has too high capacity of the air conditioner and the room temperature fluctuates beyond the set temperature. When the operation is continued, control for temporarily stopping the operation of the compressor 111 (thermo-OFF) is also performed.

  That is, when the room temperature continues to fluctuate beyond the set temperature, the air conditioner 10 compares the temperature difference between the room temperature and the set temperature with the first threshold, and when the temperature difference reaches the first threshold, the compressor 111 is temporarily stopped (thermo OFF). Specifically, during the cooling operation, the compressor 111 is thermo-off when the room temperature continues to decrease at a temperature lower than the set temperature and the temperature difference between the room temperature and the set temperature reaches the first threshold value. On the other hand, at the time of the heating operation, the room temperature continues to rise at a temperature higher than the set temperature, and when the temperature difference between the room temperature and the set temperature reaches the first threshold value, the compressor 111 is turned off.

  If the room temperature continues to fluctuate beyond the set temperature in the opposite direction to the temperature after the thermo-off of the compressor 111 after the thermo-off, the temperature difference between the room temperature and the set temperature is compared with a second threshold value, and the temperature difference is determined. Reaches the second threshold, the operation of the compressor 111 is restarted (thermo-ON). Specifically, during the cooling operation, when the room temperature continues to rise at a temperature higher than the set temperature, and when the temperature difference between the room temperature and the set temperature reaches the second threshold, the compressor 111 is thermo-ON. On the other hand, during the heating operation, the compressor 111 is thermo-ON when the room temperature is continuously decreasing at a temperature lower than the set temperature and the temperature difference between the room temperature and the set temperature reaches the second threshold value.

  However, the thermo-ON of the compressor 111 is not always performed at the same time when the temperature difference reaches the second threshold. This is because a fixed operation prohibition period (about 3 minutes) is provided after the operation of the compressor 111 is stopped to ensure reliability. That is, after the operation of the compressor 111 is stopped by the thermo-OFF, the compressor 111 cannot be thermo-ON until the operation prohibition period has elapsed. Therefore, when the temperature difference between the room temperature and the set temperature reaches the second threshold during the operation prohibition period after the thermostat of the compressor 111 is turned off, the compressor 111 waits until the operation prohibition period elapses, and The thermo is turned on. In this case, the temperature difference between the room temperature and the set temperature may exceed the second threshold at the time when the compressor 111 is thermo-ON.

  Next, the control of the rotation speed regulation of the compressor 111 after the thermo-OFF, which is a feature of the air conditioner 10 according to Embodiment 1, will be described with reference to the flowchart of FIG.

  In this rotation speed regulation control, it is determined whether or not the thermo-off of the compressor 111 has been performed (S1). If the thermo-off has been performed (YES in S1), the compressor 111 is simultaneously performed with the thermo-off. An upper limit value is set for the number of rotations (S2). The rotation speed upper limit is set only during a first predetermined time (for example, 30 minutes) after the thermo-OFF. For this reason, the main control unit 201 measures the elapsed time from the thermo-OFF by the timer 202, and when the first predetermined time has elapsed from the thermo-OFF (YES in S3), cancels the setting of the upper limit value of the rotation speed of the compressor 111. (S4).

  This rotation speed regulation control is performed independently of the thermo-ON of the compressor 111. That is, the thermo-ON of the compressor 111 normally occurs at an arbitrary timing from the thermo-OFF until the first predetermined time elapses. When the thermo-ON occurs before the first predetermined time has elapsed, the rotation speed regulation control is continued for a while after the thermo-ON. During the rotation speed regulation control, even if the required rotation speed obtained from the temperature difference-rotation speed table 203 exceeds the upper limit value set by the rotation speed regulation control, the compressor 111 maintains the upper limit value. The rotation speed is regulated so that the operation is controlled.

  In the air conditioner 10 according to the first embodiment, the operation capability of the air conditioner 10 immediately after the thermo-ON is suppressed by the rotation speed regulation control of the compressor 111, and the room temperature varies (the room temperature decreases during cooling, the room temperature decreases during heating). Rise) is also moderate. Therefore, it is possible to prevent the thermo-OFF from occurring again in a short time after the thermo-ON, prevent the occurrence of hunting at room temperature, and improve the comfort for the user. In addition, since the operation in which the thermo-OFF and the thermo-ON are repeated in a short time leads to an increase in the power consumption of the air conditioner 10, the air conditioner 10 according to the first embodiment is also excellent in energy saving. Become.

  On the other hand, the time from the thermo-off of the compressor 111 to the thermo-on again depends largely on the use environment of the air conditioner 10, particularly the heat insulation of the room. For example, when the thermal insulation of the room is low, the room temperature fluctuation after the thermo-OFF is large and the time until the thermo-on is short, so that the time under the rotation speed regulation control after the thermo-on is long. Conversely, when the heat insulation of the room is high, the fluctuation in the room temperature after the thermo-OFF is small, and the time until the thermo-on is long, so that the time under the rotational speed regulation control after the thermo-on is short.

  As described above, the air conditioner 10 according to Embodiment 1 performs the above-described rotation speed regulation control after the thermo-OFF, so that the time during which the rotation speed regulation control after the thermo-ON is received can be made variable. Appropriate control according to the use environment of the air conditioner 10 becomes possible. Specifically, in an environment where the room temperature fluctuation after the thermo-OFF is large and the time until the thermo-on is short, the time for receiving the rotation speed regulation control after the thermo-on is extended, and the operation in which the hunting at the room temperature is emphasized is emphasized. It can be carried out. On the other hand, in an environment in which the room temperature fluctuation after the thermo-OFF is small and the time until the thermo-on is long, the time to be subjected to the rotation speed regulation control after the thermo-on is shortened, and the response to the fluctuation of the air conditioning load of the room is reduced. Enhanced operation can be performed.

[Embodiment 2]
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 4 is a flowchart showing the rotation speed control of the air conditioner 10 according to Embodiment 2.

  In this rotation speed regulation control, it is determined whether or not the thermo-off of the compressor 111 has been performed (S1). If the thermo-off has been performed (YES in S1), the compressor 111 is simultaneously performed with the thermo-off. An upper limit value is set for the number of rotations (S2). Steps S1 and S2 are the same as those in the rotation speed regulation control in the first embodiment.

  After the thermo-OFF, the main control unit 201 compares the temperature difference between the room temperature and the set temperature with the third threshold value, and when the temperature difference becomes equal to or more than the third threshold value (YES in S3 ′), the rotation speed of the compressor 111 is reduced. The upper limit value setting is released (S4). Specifically, during the cooling operation, when the room temperature is higher than the set temperature, and the temperature difference between the room temperature and the set temperature reaches the third threshold, the upper limit of the rotation speed of the compressor 111 is released. . On the other hand, at the time of the heating operation, when the room temperature is lower than the set temperature and the temperature difference between the room temperature and the set temperature reaches the third threshold, the upper limit of the rotation speed of the compressor 111 is released.

  Here, the third threshold is set to a value higher than the second threshold used for the thermo-ON determination. That is, in this rotation speed regulation control, at the time when the upper limit of the rotation speed of the compressor 111 is released in S4, the air conditioner 10 is already thermo-ON. The case where a YES determination is made in S3 ′ even though the air conditioner 10 is already thermo-ON means that the air-conditioning load has fluctuated greatly, for example, when a person enters or exits the room or opens or closes a window. It is considered to be the case.

  As described above, the air conditioner 10 according to Embodiment 1 performs the above-described rotation speed regulation control after the thermo-OFF, so that there is no large change in the air-conditioning load after the thermo-ON, and the temperature difference between the room temperature and the set temperature. As long as the value does not exceed the third threshold value, by setting an upper limit value for the rotation speed of the compressor 111, it is possible to perform an operation that emphasizes hunting prevention at room temperature. On the other hand, if a large change in the air-conditioning load occurs after the thermo-ON and the temperature difference between the room temperature and the set temperature exceeds the third threshold, the upper limit of the number of revolutions of the compressor 111 is released to cancel the room. It can respond to fluctuations in air conditioning load.

[Embodiment 3]
Hereinafter, a third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 5 is a flowchart showing the rotation speed regulation control of the air conditioner 10 according to Embodiment 3. The rotation speed regulation control according to the third embodiment is a combination of the rotation speed regulation control of the first and second embodiments.

  In this rotation speed regulation control, it is determined whether or not the thermo-off of the compressor 111 has been performed (S1). If the thermo-off has been performed (YES in S1), the compressor 111 is simultaneously performed with the thermo-off. An upper limit value is set for the number of rotations (S2). Steps S1 and S2 are the same as those in the first embodiment and the second embodiment.

  After the thermostat is turned off, the main control unit 201 determines whether a first predetermined time has elapsed since the thermostat was turned off (S3), and determines whether the temperature difference between the room temperature and the set temperature is equal to or greater than a third threshold value. (S3 '). Then, while both S3 and S3 'are determined to be NO, the setting of the upper limit of the rotational speed of the compressor 111 is continued, and when one of S3 and S3' is determined to be YES, the rotational speed of the compressor 111 is reduced. The upper limit value setting is released (S4).

  As described above, the air conditioner 10 according to Embodiment 3 can enjoy both advantages by combining the rotation speed regulation controls of Embodiments 1 and 2. First, when a large change in the air-conditioning load occurs after the thermo-ON and the temperature difference between the room temperature and the set temperature exceeds the third threshold, the upper limit of the number of revolutions of the compressor 111 is released to control the air-conditioning of the room. Can respond to load fluctuations.

  However, even if the air-conditioning load fluctuates after the thermo-ON, the temperature difference between the room temperature and the set temperature does not always exceed the third threshold. Therefore, with only the rotation speed regulation control according to the second embodiment, the temperature difference between the room temperature and the set temperature does not exceed the third threshold value, and the upper limit setting of the rotation speed of the compressor 111 may not be released forever. obtain. In this case, the required rotation speed of the compressor 111 is obtained from the temperature difference-rotation speed table 203, and the control cannot be shifted to the basic control of controlling the compressor 111 so that the rotation speed of the compressor 111 becomes the required rotation speed. The operation is continued while the responsiveness to a load change (a relatively small change in the air conditioning load such that the temperature difference does not exceed the third threshold) is reduced.

  In the rotation speed regulation control according to the third embodiment, even if the temperature difference between the room temperature and the set temperature does not exceed the third threshold, the upper limit value setting is released after the first predetermined time has elapsed since the thermo-OFF. Therefore, the responsiveness to a change in the air conditioning load is improved thereafter.

[Embodiment 4]
In the rotation speed regulation control according to the first to third embodiments, an upper limit value is set for the rotation speed of the compressor 111 at the same time as the execution of the thermo-OFF. The fourth embodiment is characterized in that the upper limit of the number of revolutions is changed depending on the outside air temperature.

  The heating / cooling efficiency of the air conditioner 10 is greatly affected by the outside air temperature. Specifically, during cooling, the cooling efficiency decreases as the outside air temperature increases, and during heating, the heating efficiency decreases as the outside air temperature decreases. Therefore, for example, in the case of cooling, the lower the outside air temperature is, the higher the operation capability of the air conditioner 10 becomes, and the thermo-OFF is more likely to occur. Conversely, at the time of heating, the higher the outside air temperature, the more easily the thermo-OFF is likely to occur.

  In the rotation speed regulation control according to Embodiment 4, during cooling, the lower limit of the rotation speed is set to a lower value as the outside air temperature is lower, and the upper limit value of the rotation speed is set to a higher value as the outside air temperature is higher. On the other hand, during heating, the higher the outside air temperature, the lower the upper limit of the number of revolutions is set, and the lower the outside air temperature, the higher the upper limit of the number of revolutions is set. As a result, the upper limit of the number of revolutions is set to a lower value in a state where the thermo-OFF is more likely to occur, and the regulation of the number of revolutions of the compressor 111 is strengthened. Therefore, frequent occurrence of the thermo-off can be suppressed. Further, in a state where the thermo-OFF does not easily occur, the regulation of the rotation speed of the compressor 111 is weakened, and the responsiveness to the fluctuation of the air conditioning load is improved.

  When performing the rotation speed regulation control according to the fourth embodiment, the outside air temperature is detected by an outside air temperature sensor 122 (see FIG. 1) provided in the outdoor unit 110 and input to the main control unit 201.

  The embodiment disclosed this time is an example in all respects, and is not a basis for restrictive interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the claims. In addition, all changes within the meaning and scope equivalent to the claims are included.

Reference Signs List 10 air conditioner 100 indoor unit 101 indoor heat exchanger 102 indoor fan 110 outdoor unit 111 compressor 112 outdoor heat exchanger 113 four-way valve 114 expansion valve 115 outdoor fan 121 room temperature sensor 122 outside air temperature sensor 20 control unit 201 main control unit 202 Timer 203 temperature difference-speed table

Claims (4)

An air conditioner that turns off the compressor when the temperature difference between room temperature and the set temperature reaches a first threshold, and turns on the compressor when the temperature difference between room temperature and the set temperature reaches a second threshold after the thermo-off. And
An air conditioner wherein an upper limit value is set for the number of revolutions of the compressor when the thermo OFF occurs, and the setting of the upper limit is canceled after a lapse of a first predetermined time from the thermo OFF. An air conditioner that turns off the compressor when the temperature difference between room temperature and the set temperature reaches a first threshold, and turns on the compressor when the temperature difference between room temperature and the set temperature reaches a second threshold after the thermo-off. And
An upper limit value is set for the number of revolutions of the compressor at the time when the thermo-OFF occurs. An air conditioner characterized by canceling the setting. An air conditioner that turns off the compressor when the temperature difference between room temperature and the set temperature reaches a first threshold, and turns on the compressor when the temperature difference between room temperature and the set temperature reaches a second threshold after the thermo-off. And
An upper limit value is set for the number of revolutions of the compressor at the time when the thermo OFF occurs, and after the thermo OFF, the temperature difference between the room temperature and the set temperature becomes equal to or larger than a third threshold larger than the second threshold, or An air conditioner wherein the setting of the upper limit is canceled after a lapse of a first predetermined time from the thermo OFF. The air conditioner according to any one of claims 1 to 3, wherein
The upper limit, the value is changed according to the outside air temperature, during cooling, the upper limit is set to a lower value as the outside air temperature is lower, and during heating, the upper limit is set as the outside air temperature is higher. An air conditioner characterized by being set to a low value.

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