JP6225819B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner.

  In conventional air conditioners, as in Patent Document 1, for example, the air volume of an indoor unit is divided into a plurality of set air volumes such as “strong wind”, “weak wind”, and “slight wind” so that the user can arbitrarily select them. There is something that has become. Also, the set air volume selected by the user is often set to operate at a constant air volume regardless of the magnitude of the air conditioning load at the start of operation or the temporal change of the air conditioning load. When the maximum set air volume among the set air volumes that can be selected is selected, the indoor unit always operates with the maximum set air volume set in the air conditioner.

  Further, some conventional air conditioners control the air conditioning capacity according to the air conditioning load by controlling the number of revolutions of the compressor as disclosed in Patent Document 2, for example. Specifically, when the outdoor temperature is high during indoor cooling, the amount of heat that moves from the outdoor to the indoor increases, so the air conditioning load increases, and in order to keep the indoor temperature constant, compression is performed according to the air conditioning load. It is necessary to increase the air conditioning capacity by increasing the number of revolutions of the machine. Conversely, when the outdoor temperature is low during indoor cooling, the amount of heat that moves from the outdoor to the indoor space decreases, so the air conditioning load is reduced, and the compressor speed needs to be reduced to reduce the air conditioning capacity. .

JP 2011-252655 A JP 2007-10200 A

  Generally, the compressor has a minimum rotation speed that can be operated from the viewpoint of reliability. Therefore, if the air conditioning capacity is controlled by operating the compressor speed as in Patent Document 2, the control of the compressor speed alone can cope with an air conditioning load lower than the air conditioning capacity at the minimum compressor speed. The air conditioning capacity is adjusted by repeating the operation / stop of the compressor. However, if the operation / stop of the compressor is repeated, the indoor temperature changes frequently and the user feels uncomfortable. In addition, when restarting the compressor operation, it is necessary to cool or heat not only the indoor air but also the components of the air conditioner such as the refrigerant and the indoor heat exchanger, and the power consumption increases when the compressor is started. From this point, the energy consumption increases by repeating the operation / stop of the compressor.

  Further, since the amount of heat exchange between the indoor heat exchanger and room air increases as the air volume of the indoor unit increases, the air conditioning capacity of the air conditioner also increases as the air volume of the indoor unit increases. Therefore, especially when the maximum set air volume that can be selected by the user is selected, the air conditioning capacity at the minimum speed of the compressor increases, and the frequency of occurrence of operation / stop of the compressor also increases. End up.

  This invention is made | formed in view of the above, Comprising: It aims at providing the air conditioner by which the repetition of the driving | operation / stop of a compressor was suppressed and energy consumption efficiency was improved.

The air conditioner of the present invention includes a compressor that compresses a refrigerant, an indoor heat exchanger that heats or cools indoor air using the refrigerant, an indoor blower that blows the indoor air to the indoor heat exchanger, and an outdoor An outdoor temperature sensor for measuring the temperature of the air, storage means for storing a preset indoor set temperature, and control means for controlling the number of revolutions of the compressor and the indoor blower. Then, as the difference between the outdoor temperature measured by the outdoor temperature sensor and the indoor set temperature is reduced, the rotational speed of the compressor is controlled after the rotational speed of the indoor blower is decreased .

  The air conditioner according to the present invention reduces not only the rotation speed of the compressor but also the rotation speed of the indoor blower as the difference between the outdoor temperature measured by the outdoor temperature sensor and the set temperature is reduced. The difference between the outdoor temperature and the set temperature is repeated, and frequent compressor operation / stop is suppressed, improving energy consumption efficiency.

It is the schematic at the time of the cooling operation of the air conditioner which concerns on this invention. It is the schematic at the time of heating operation of the air conditioner which concerns on this invention. It is a block diagram of the air conditioner concerning the present invention. It is the graph showing the air-conditioning load and the air-conditioning capability of the air conditioner with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation related to the conventional air conditioner. It is the graph showing the rotation speed of the indoor fan motor with respect to the difference of the outdoor temperature at the time of the cooling operation which concerns on the conventional air conditioner, and indoor setting temperature. It is the graph showing the rotation speed of the compressor with respect to the difference of the outdoor temperature at the time of the cooling operation which concerns on the conventional air conditioner, and indoor setting temperature. 6 is a graph showing the air conditioning load and the air conditioning capacity of the air conditioner with respect to the difference between the outdoor temperature and the indoor set temperature during cooling operation according to the air conditioner of Embodiment 1. 5 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of Embodiment 1. 4 is a graph showing the number of rotations of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during cooling operation according to the air conditioner of Embodiment 1. 2 is a flowchart for controlling the air conditioning capability during cooling operation according to the air conditioner of Embodiment 1. FIG. 7 is a correspondence table between indoor set temperature Tm and threshold temperature T12 in a modification of the first embodiment. 5 is a graph showing the air conditioning load and the air conditioning capacity of the air conditioner with respect to the difference between the outdoor temperature and the indoor set temperature during the heating operation according to the air conditioner of Embodiment 1. FIG. 6 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the heating operation according to the air conditioner of Embodiment 1. 6 is a graph showing the number of rotations of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during the heating operation according to the air conditioner of Embodiment 1. 3 is a flowchart for controlling the air-conditioning capability during the heating operation according to the air conditioner of Embodiment 1. FIG. 6 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of Embodiment 2. 6 is a graph showing the number of rotations of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during cooling operation according to the air conditioner of Embodiment 2. 6 is a flowchart for controlling the air-conditioning capacity during cooling operation according to the air conditioner of Embodiment 2. FIG. 6 is a flowchart for controlling the air-conditioning capacity during heating operation according to the air conditioner of Embodiment 2. FIG. 10 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of Embodiment 3. 10 is a graph showing the number of rotations of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during cooling operation according to the air conditioner of Embodiment 3. 6 is a flowchart for controlling the air-conditioning capacity during cooling operation according to the air conditioner of Embodiment 3. FIG. 6 is a flowchart for controlling the air-conditioning capacity during heating operation according to the air conditioner of Embodiment 3. FIG.

Embodiment 1 FIG.
First, the configuration of the air conditioner according to the present invention will be described. FIG. 1 is a schematic view of the air conditioner according to the present invention during cooling operation. FIG. 2 is a schematic view during the heating operation of the air conditioner according to the present invention. The air conditioner 1 is composed of an outdoor unit 10 and an indoor unit 20, and the outdoor unit 10 is disposed outdoors and the indoor unit 20 is disposed indoors. The outdoor unit 10 and the indoor unit 20 are connected by a refrigerant pipe and a communication line.

  In the outdoor unit 10, a compressor 11 that sucks and compresses the refrigerant and discharges it, a four-way valve 12 having four connection ports of A port, B port, C port and D port, and decompression of the refrigerant. An expansion valve 13 to be performed, an outdoor heat exchanger 14 that exchanges heat between the refrigerant and the outdoor air, an outdoor fan 15 that blows outdoor air to the outdoor heat exchanger 14, and an outdoor temperature that measures the temperature of the outdoor air A sensor 16 is provided. An indoor heat exchanger 21 that exchanges heat between the refrigerant and room air and an indoor blower 22 that blows room air to the indoor heat exchanger 21 are provided inside the indoor unit 20. The indoor blower 22 includes an indoor fan 22a that rotates to form a flow of indoor air, and an indoor fan motor 22b that rotates the indoor fan 22a. Therefore, the rotation speed of the indoor fan 22 corresponds to the rotation speed of the indoor fan motor 22b.

  The air conditioner 1 includes a compressor 11, a four-way valve 12, an expansion valve 13, an outdoor heat exchanger 14, and an indoor heat exchanger 21 connected by a refrigerant pipe, thereby constituting a refrigeration cycle in which refrigerant circulates inside. Has been. Specifically, the A port of the four-way valve 12 is the indoor heat exchanger 21, the B port is the outlet of the compressor 11, the C port is the outdoor heat exchanger 14, and the D port is the inlet of the compressor 11. The refrigeration cycle is configured by connecting the outdoor heat exchanger 14 and the indoor heat exchanger 21 via the expansion valve 13 and the refrigerant pipe, respectively. The refrigeration cycle can be switched between a cooling operation for cooling indoor air and a heating operation for heating indoor air by switching the refrigerant flow by the four-way valve 12.

  During the cooling operation, as shown in FIG. 1, the four-way valve 12 connects the A port and the D port, and connects the B port and the C port. During the cooling operation, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 11 is sent to the outdoor heat exchanger 14 via the four-way valve 12. The outdoor heat exchanger 14 functions as a condenser, and the refrigerant releases heat to the outdoor air and changes to a low-temperature and high-pressure liquid state. The refrigerant that has changed to the liquid state expands under reduced pressure by passing through the expansion valve 13, enters a low-temperature low-pressure liquid state, and flows into the indoor heat exchanger 21. Since the indoor heat exchanger 21 functions as an evaporator, the refrigerant absorbs heat from the indoor air and vaporizes, and changes to a high-temperature and low-pressure gas state. The high-temperature and low-pressure gas state refrigerant is sucked into the compressor 11 via the four-way valve 12, and returns to the high-temperature and high-pressure gas state again by the compressor 11. Since the refrigerant circulates in this way during the cooling operation, the indoor air is cooled by the low-temperature and low-pressure refrigerant flowing into the indoor heat exchanger 21.

  During the heating operation, the four-way valve 12 connects the A port and the B port and connects the C port and the D port as shown in FIG. During the heating operation, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 11 is sent to the indoor heat exchanger 21 via the four-way valve 12. The indoor heat exchanger 21 functions as a condenser, and the refrigerant releases heat to the indoor air and changes to a low-temperature and high-pressure liquid state. The refrigerant that has changed to a liquid state expands under reduced pressure by passing through the expansion valve 13, enters a low-temperature low-pressure liquid state, and flows into the outdoor heat exchanger 14. Since the outdoor heat exchanger 14 functions as an evaporator, the refrigerant absorbs heat from the outdoor air and vaporizes, and changes to a high-temperature and low-pressure gas state. The high-temperature and low-pressure gas state refrigerant is sucked into the compressor 11 via the four-way valve 12, and returns to the high-temperature and high-pressure gas state again by the compressor 11. Since the refrigerant circulates in this way during the heating operation, the indoor air is heated by the high-temperature and high-pressure refrigerant flowing into the indoor heat exchanger 21.

  Further, since the flow rate of the refrigerant per unit time increases as the rotational speed of the compressor 11 increases, the amount of heat exchange between the refrigerant flowing into the indoor heat exchange 21 and the room air increases, so that the air conditioner 1 is air-conditioned. Ability increases. Furthermore, since the flow rate of the indoor air blown to the indoor heat exchanger 21 increases as the rotational frequency RF of the indoor fan motor 22b increases, more indoor air exchanges heat with the indoor heat exchanger 21. The air conditioning capacity of the harmony machine 1 increases.

  FIG. 3 is a block diagram of the air conditioner according to the present invention. The air conditioner 1 is provided with a control device 30 and an operation unit 40 that allows at least a user to select the indoor set temperature Tm and the air volume of the indoor unit 20. At least the compressor 11, the four-way valve 12, the outdoor temperature sensor 16, the indoor fan motor 22b, and the operation unit 40 are communicably connected to the control device 30. The control device 30 also includes a storage unit 31 that stores the indoor set temperature Tm and air volume selected by the operation unit 40 and a predetermined threshold temperature difference T1, the compressor 11, the four-way valve 12, and the indoor fan motor. A control unit 32 that performs control of 22b, a calculation unit 33 that calculates a temperature difference between the indoor set temperature Tm and the outdoor temperature T, and a determination unit that compares the temperature difference between the indoor set temperature Tm and the outdoor temperature T with a threshold temperature difference T1. 34.

Further, the storage unit 31 corresponds to a plurality of set air volumes each having a different air volume set in advance, a set rotation speed RF ₁ that is the rotation speed of the indoor fan motor 22b corresponding to each set air volume, and the set air volume. the set airflow is set rotational speed RF corresponding to the (first set air volume corresponding to the present invention) 1 _(first set corresponding to the rotational speed of the present invention) preset reduced set rotational speed RF lower than ₂ (corresponding to the third set rotational speed of the present invention). Lowering speed setting RF ₂ is set air volume of the stage of one lower than the set air amount corresponding to the decrease speed setting RF ₂ set rotational speed RF 1 _(present invention in (a second corresponding to the set air volume of the present invention) Is equivalent to the second set rotational speed). For example, “High”, “Medium”, and “Low” are set in three stages. The “High” setting speed is set to RF _L1 , the “Low” setting speed is set to RF _L2 , and “Medium” is set. When the rotational speed is RF _M1 , the lower setting rotational speed of “medium” is RF _M2 , the lower rotational speed setting of “weak” is RF _{S1, and} the lower rotational speed setting of “weak” is RF _S2 , RF _L1 > RF _L2 > The relationship RF _M1 > RF _M2 > RF _S1 > RF _S2 is established. In this example, assuming that the first set air volume in the present invention is “strong”, the second set air volume is “medium”, the first set speed is RF _L1 , and the second set speed is The third set rotational speed corresponds to RF _M1 and RF _L2 , respectively. Further, assuming that the first set air volume is “medium”, the second set air volume is “weak”, the first set speed is RF _M1 , the second set speed is RF _S1 , and the third The set rotational speed corresponds to RF _M2 . Also, if the rotational speed of the indoor fan motor 22b becomes too small, vibration due to uneven rotation, or the refrigerant is not sufficiently vaporized in the indoor heat exchanger 21 during the cooling operation and is sucked into the compressor 11 in a liquid state, causing the failure. Therefore, the indoor fan motor 22b is often set to a minimum rotational speed. Therefore, most air volume decrease setting rotational speed RF ₂ in a small set air amount is set higher than the minimum rotational speed of the indoor fan motor 22b.

Air volume setting of the indoor unit 20, operation unit 40 from the user selects one from among the set air volume, the selected set airflow indoor fan motor 22b rpm RF setting rotational speed RF ₁ in response to It has been achieved by controlling. For example, when “strong” is selected from the set air volume from the operation unit 40, the indoor fan motor 22b rotates at the rotation speed RF _L1 , and the air volume of the indoor unit 20 is set to the “strong” air volume.

  Next, the control of the air conditioning capacity in the case of a conventional air conditioner will be described. FIG. 4 is a graph showing the air conditioning load and the air conditioning capacity of the air conditioner with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation of the conventional air conditioner. FIG. 5 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the conventional air conditioner. FIG. 6 is a graph showing the number of rotations of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation of the conventional air conditioner. The configuration of the conventional air conditioner is the same as that of the air conditioner 1 of the first embodiment. As shown in FIG. 1, the four-way valve connects the A port and the D port, and connects the B port and the C port. The conditioner is in a cooling operation state. Tm is the indoor set temperature of the indoor air selected by the operation unit 40, and the control unit 32 controls the air conditioner so as to keep the indoor temperature at the indoor set temperature Tm. In addition, the graph of FIG.4, FIG5 and FIG.6 is a graph in case room temperature is equal to Tm.

  The air conditioning load in the present invention is a heat load necessary for removing the amount of heat entering the room from the outside in order to keep the air condition such as the room temperature, humidity or enthalpy constant. Therefore, the air conditioning load generally increases as the difference between the outdoor temperature T and the indoor temperature, that is, the indoor set temperature Tm increases. Further, in the case of Tm = T where the difference between the outdoor temperature T and the indoor set temperature Tm is 0, the amount of heat entering the room from the outside disappears, so the air conditioning load is also 0. Further, since FIG. 4 assumes a cooling operation, the air conditioning load is considered to be 0 when the outdoor temperature is smaller than the indoor set temperature Tm and Tm> T. That is, when Tm ≧ T, the air conditioning load is 0. When Tm <T, the air conditioning load increases as the difference between the outdoor temperature T and the indoor set temperature Tm increases, that is, as the value of (T−Tm) increases. Therefore, the graph is as shown in FIG.

In the case of the conventional air conditioner, the control device 30 acquires the outdoor temperature T measured by the outdoor temperature sensor 16, the indoor set temperature Tm stored in the storage unit 31 in advance, the selected set air volume, The rotational speed of the compressor 11 is controlled according to the measured outdoor temperature T, and the air conditioning capacity is controlled to be substantially equal to the air conditioning load. At this time, the control method of the rotational speed RC of the compressor 11 is determined by the control device 30 calculating the air conditioning load from the difference between the outdoor temperature T and the indoor set temperature Tm according to the calculation result and the selected set air volume. The association is stored in the control device 30 so that the rotational speed of the compressor 11 is specified by the method or the difference between the outdoor temperature T and the indoor set temperature Tm and the set air volume, and the association and the indoor set temperature at the time of control are stored. There is a method of determining according to Tm and outdoor temperature T. The rotational speed RF of the indoor fan motor 22b, regardless of the indoor set temperature and the outdoor temperature is constant at the set rotational speed RF ₁ in accordance with the set air amount that has been selected by the operation section 40, for example, "HIGH" setting If it is, the rotational frequency RF of the indoor fan motor 22b is constant at RF _L1 .

A set rotational speed RF ₁ the rotational speed RF of the indoor fan motor 22b is corresponding to the set air amount is selected from the operation unit 40, the air-conditioning capacity equivalent to the case where the rotational speed of the compressor 11 is minimum rotational speed RC _min The difference between the outdoor temperature T, which is an air conditioning load, and the indoor set temperature Tm is defined as a limit temperature difference T2. In the conventional air conditioner, when (T−Tm) ≧ T2, the air conditioning capacity can be controlled to be substantially equal to the air conditioning load by controlling the rotation speed of the compressor 11, but (T−Tm). <for exceeding the air conditioning capability is the air conditioning load even minimum rotation speed RC _min compressor 11 in the case of T2, the compressor 11 must repeat the operation and stop. Therefore, when (T−Tm) <T2, when the compressor 11 is stopped, the refrigerant and the members constituting the refrigeration cycle approach the indoor temperature or the outdoor temperature, respectively. It is necessary to return the members constituting the refrigeration cycle to the temperature during the refrigeration cycle operation again. Further, in general, in the compressor 11, the power consumption for starting activation is larger in the power consumption for starting activation and the power consumption for maintaining rotation. Therefore, towards the case of repeating operation and stop than when continuous operation for a minimum rotational speed RC _min is the energy consumption efficiency is deteriorated.

  Next, control of the air conditioning capability in the case of the air conditioner of Embodiment 1 of the present invention will be described. FIG. 7 is a graph showing the air conditioning load and the air conditioning capacity of the air conditioner with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation of the air conditioner of the first embodiment. FIG. 8 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of the first embodiment. FIG. 9 is a graph showing the number of rotations of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of the first embodiment. In the air conditioner, the four-way valve is connected to the A port and the D port, and the B port and the C port are connected as shown in FIG.

In the case of the air conditioner 1 according to the first embodiment, the control device 30 acquires the outdoor temperature T measured by the outdoor temperature sensor 16, and based on the stored indoor set temperature Tm and the measured outdoor temperature T. The number of revolutions of the compressor 11 and the indoor fan motor 22b is controlled to control the air conditioning capacity so as to be substantially equal to the air conditioning load. Specifically, when the difference between the outdoor temperature T and the indoor set temperature Tm is equal to or greater than a preset threshold temperature difference T1, the rotational frequency RF of the indoor fan motor 22b is set to the set air volume selected from the operation unit 40. rotates at the set rotational speed RF ₁ in accordance, it is smaller than the threshold temperature difference T1 rotates at a reduced speed setting RF ₂ in accordance with the set air amount is selected from the operation unit 40. For example, when “strong” is selected as the set air volume, the indoor fan motor 22b rotates at the set rotation speed RF _L1 in the region of (T−Tm) ≧ T1, and the region of (T−Tm) <T1. Then, the indoor fan motor 22b rotates at RF _L2 which is the lower set rotational speed. The threshold temperature difference T1 is set to a temperature difference higher than the limit temperature difference T2, and T2 <T1 is established.

  Further, the compressor 11 is controlled by the control device 30 so that the air conditioning capability is substantially equal to the air conditioning load. Unlike the conventional air conditioner, when the difference between the outdoor temperature T and the indoor set temperature Tm is the threshold temperature difference T1, the rotational speed of the indoor fan motor 22b is changed, and accordingly the rotational speed of the compressor 11 is also changed. It changes with the threshold temperature difference T1. However, since the rotation speed of the indoor fan motor 22b is determined by the outdoor temperature T and the indoor set temperature Tm, the control device 30 selects the indoor set temperature Tm and the measured outdoor temperature T as in the conventional air conditioner. The rotational speed of the compressor 11 can be controlled according to the set air volume.

In the first embodiment, a flowchart for controlling the air conditioning capability will be described. FIG. 10 is a flowchart of control of the air conditioning capability during the cooling operation according to the air conditioner of the first embodiment. In step S <b> 1, the control device 30 acquires the outdoor temperature T from the outdoor temperature sensor 16. After acquiring the outdoor temperature T, the process proceeds to step S <b> 2, and the calculation unit 33 calculates the difference (T−Tm) between the outdoor temperature T acquired in step S <b> 1 and the indoor set temperature Tm stored in the storage unit 31. After the calculation of (T−Tm), the process proceeds to step S3, and the determination unit 34 compares the calculation result of (T−Tm) with a preset threshold temperature difference T1 to determine whether the threshold temperature difference T1 is higher. That is, it is determined whether or not the condition of (T−Tm) <T1 is satisfied. If the condition is satisfied, the process proceeds to step S4, the control unit 32 controls the lowering speed setting RF ₂ in accordance with the set air amount is selected from the operation unit 40 the rotational speed RF of the indoor fan motor 22b. If the condition is not satisfied processing proceeds to a step S5, the control unit 32 controls the setting rotational speed RF ₁ in accordance with the set air amount is selected from the operation unit 40 the rotational speed RF of the indoor fan motor 22b. In step S4 and step S5, after controlling the rotational speed RF of the indoor fan motor 22b, the process proceeds to step S6, and the control unit 32 selects the rotational speed RC of the compressor 11 as the outdoor temperature T and the indoor set temperature Tm. Control based on the set air volume. After controlling the rotation speed of the compressor 11, the process returns to step S1.

Air conditioner 1 of the first embodiment is rotated in the (T-Tm) <In the case of T1 indoor fan motor 22b is lower rpm than the set rotating speed RF ₁ drop speed setting RF _2. Therefore, the air conditioner 1 according to Embodiment 1 has an air conditioning load equivalent to the air conditioning capacity when the rotation speed of the indoor fan motor 22b is RF ₂ and the rotation speed of the compressor 11 is the minimum rotation speed RC _min. It can be lowered to a second limit temperature difference T3, which is the difference between the outdoor temperature T and the indoor set temperature Tm. Since the relationship between the set rotational speed RF ₁ and the lower set rotational speed RF ₂ is RF ₁ > RF ₂ , a relationship of T2> T3 is established between the limit temperature difference T2 and the second limit temperature difference T3. The air conditioner 1 in the first embodiment has a wider range in which the air conditioning capability can be controlled to be substantially equal to the air conditioning load, as compared with the conventional air conditioner. That is, in the air conditioner 1 according to the first embodiment, the difference between the outdoor temperature T and the indoor set temperature Tm at which the compressor is repeatedly operated / stopped is narrower than that of the conventional air conditioner. The operation / stop of the compressor is suppressed. Therefore, energy consumption due to repeated operation / stop of the compressor is suppressed, and energy consumption efficiency is improved.

As described above, the air conditioner of Embodiment 1 performs control so as to decrease the rotational speed of the indoor fan motor 22b when the difference between the outdoor temperature T and the indoor set temperature Tm is lower than the threshold temperature T1. Frequent compressor operation / stop is suppressed, improving energy consumption efficiency. In particular, when the rotational speed of the indoor fan motor 22b is high compared to other set air volumes, such as when the set air volume is "strong", the limit temperature difference T2 at which the compressor is repeatedly operated / stopped is set to another setting. Since the temperature difference is higher than that at the time of air flow, a higher effect can be obtained. Furthermore, lowering speed setting RF ₂ are the rotational speed higher than the set rotational speed RF ₁ in set air volume stage below the set air volume of the drop speed setting RF _2, the rotation speed of the indoor fan motor 22b is Even in the case of (T−Tm) <T1, the air volume does not become lower than the lower set air volume, so that the user is less likely to notice the change in the air volume of the indoor unit.

In the first embodiment, only the state where the set air volume is “strong” is described as an example. However, the present invention is not limited to this. For example, in the state where the set air volume is “medium” or the set air volume is “small”, When (T−Tm) ≧ T1, the number of rotations of the indoor fan motor 22b is controlled to RF _M1 or RF _S1 , which is the set number of rotations. When (T−Tm) <T1, the number of rotations of the indoor fan motor 22b is controlled. You may make it control to RF _M2 or RF _S2 which is each fall setting rotation speed defined lower than RF _M1 or RF _S1 . That is, when a plurality of stages of set air volume can be set, a lower set rotation speed RF ₂ lower than the set rotation speed RF ₁ of the indoor fan motor 22b is set in advance according to each set air volume, and (T−Tm). <satisfies the conditions of T1 may be configured so as to control the indoor fan motor 22b to decrease speed setting RF _2. In any case, the lower setting rotational speed is set so as not to be lower than the setting rotational speed of the lower set air volume, thereby making it difficult for the user to notice a change in the air volume of the indoor unit. Further, by setting each of the rotation speed, such as the difference between the set rotational speed RF ₁ and lowering speed setting RF ₂ corresponds to less noise value -2 dB, further users hardly notice the change in the air volume of the indoor unit.

Further, when the air volume can be set from a plurality of set air volumes, there may be a set air volume that does not control the indoor fan motor 22b when controlling the air conditioning capability. For example, when the set air volume is “strong” and “medium”, the rotational speed RF of the indoor fan motor 22b is changed according to the outdoor temperature T and the indoor set temperature Tm according to the flowchart of FIG. May control the indoor fan motor to rotate at the set rotational speed RF _S1 regardless of the outdoor temperature T and the indoor set temperature Tm.

  Furthermore, the value of the threshold temperature difference T1 may be changed according to the indoor set temperature Tm. When the value of the threshold temperature difference T1 is changed according to the indoor set temperature Tm, the threshold according to the indoor set temperature Tm is set so that the outside air temperature T becomes smaller than 35 ° C. when (T−Tm) = T1. It is desirable to set the temperature difference T1. For example, when the indoor set temperature Tm is set to 28 ° C., it is desirable to set T1 to a value lower than 7 ° C. This is because in JIS C9612, the outside air temperature is determined to be 35 ° C. in the air conditioning capability test during the cooling operation, and it is desirable that the air conditioner 1 is set so as to exhibit the maximum air conditioning capability at the outside air temperature of 35 ° C. Because.

In the first embodiment, but controls the indoor fan motor 22b to decrease speed setting RF ₂ if the difference between the outdoor temperature T and the indoor set temperature Tm is equal to or less than the threshold temperature difference T1, not limited to this , threshold temperature T12 in response to the indoor set temperature Tm is stored in the storage unit 31, if the outdoor temperature T is higher than the threshold temperature T12 controls the indoor fan motor 22b in the set rotational speed RF _1, the outdoor temperature T threshold If lower than the temperature T12 may control the indoor fan motor 22b to decrease speed setting RF _2. For example, as shown in the correspondence table between the indoor set temperature Tm and the threshold temperature T12 in the modification of the first embodiment in FIG. 11, the threshold temperature T12 is determined for the indoor set temperature Tm, and the determined threshold temperature T12 and the outdoor temperature are determined. The rotational speed of the indoor fan motor 22b may be changed by comparing the temperature T. Further, the threshold temperature T12 is preferably set to 35 ° C. or lower from JIS C9612.

FIG. 12 is a graph showing the air conditioning load and the air conditioning capability of the air conditioner with respect to the difference between the outdoor temperature and the indoor set temperature during the heating operation according to the air conditioner of the first embodiment. FIG. 13 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the heating operation according to the air conditioner of the first embodiment. FIG. 14 is a graph showing the rotation speed of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during the heating operation according to the air conditioner of the first embodiment. In Embodiment 1, the air conditioner 1 has been described only when it is in the cooling operation, but the same control can be performed during the heating operation. In the case of the heating operation, the air conditioning load is considered to be 0 when the outdoor temperature is larger than the indoor set temperature Tm and Tm <T. That is, when Tm ≦ T, the air conditioning load becomes 0. When Tm> T, the air conditioning load increases as the difference (Tm−T) between the outdoor temperature T and the indoor set temperature Tm increases. Therefore, in the case of the cooling operation, the difference between the outdoor temperature T and the indoor set temperature Tm is derived by (T−Tm), but in the case of the heating operation, it is substantially the same except that it is derived by (Tm−T). Can be adapted. Incidentally, the threshold temperature difference T1, the set rotational speed RF ₁ and lowering speed setting RF ₂ may be different from the cooling operation and the heating operation, also may be the same.

  Further, when the value of the threshold temperature difference T1 is changed according to the indoor set temperature Tm during the heating operation, the difference between the indoor set temperature Tm and the threshold temperature difference T1, that is, the outside air temperature T when (Tm−T) = T1. It is desirable to set the threshold temperature difference T1 in accordance with the indoor set temperature Tm so that is smaller than 7 ° C. For example, when the indoor set temperature Tm is set to 20 ° C., it is desirable to set T1 to a value lower than 13 ° C. This is because in JIS C9612, the outside air temperature is determined to be 7 ° C. in the air conditioning capability test during heating operation, and it is desirable that the air conditioner 1 is set so as to exhibit the maximum air conditioning capability at the outside air temperature of 7 ° C. It is.

  FIG. 15 is a flowchart of control of the air conditioning capability during the heating operation according to the air conditioner of the first embodiment. The only difference from the cooling operation is step S12 and step S13, and steps S11, S14, S15, and S16 perform the same processing as steps S1, S4, S5, and S6, respectively. In step S12, the calculation unit 33 calculates the difference (Tm−T) between the indoor set temperature Tm stored in the storage unit 31 and the outdoor temperature T acquired in step S11. After the calculation of (Tm−T), the process proceeds to step S13, and the determination unit 34 compares the calculation result of (Tm−T) with a preset threshold temperature difference T1 to determine whether the threshold temperature difference T1 is higher. That is, it is determined whether the condition of (Tm−T) <T1 is satisfied. If the condition is satisfied, the process proceeds to step S14. If not satisfied, the process proceeds to step S15.

Embodiment 2. FIG.
Control of the air conditioning capability in the case of the air conditioner of Embodiment 2 will be described. FIG. 16 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of the second embodiment. FIG. 17 is a graph showing the rotation speed of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of the second embodiment. The storage unit 31 stores the second limit temperature difference T3 at each set air volume, and the determination unit 34 compares the second limit temperature difference T3 with the difference between the outdoor temperature T and the indoor set temperature Tm. Since it is the same as that of form 1, it omits. Further, the graph showing the air conditioning load and the air conditioning capacity of the air conditioner with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of Embodiment 2 is the same as FIG. .

In the air conditioner 1 of the second embodiment, as in the first embodiment, the control device 30 acquires the outdoor temperature T measured by the outdoor temperature sensor 16, and the outdoor set temperature Tm stored in advance is measured. The rotational speeds of the compressor 11 and the indoor fan motor 22b are controlled based on the temperature T, and the air conditioning capability is controlled to be substantially equal to the air conditioning load. Specifically, when the difference between the outdoor temperature T and the indoor set temperature Tm is equal to or greater than a preset threshold temperature difference T1, the indoor fan motor 22b rotates according to the set air volume selected from the operation unit 40. When the rotational speed is a number RF ₁ and is smaller than the threshold temperature difference T1, the rotational speed is controlled to decrease continuously or stepwise as the difference between the outdoor temperature T and the indoor set temperature Tm decreases. Rotational speed of the lower limit of the indoor fan motor 22b is set to decrease speed setting RF _2, the rotation speed of the indoor fan motor 22b is reduced speed setting RF ₂ speed minimum rotational speed RC of the compressor 11 The difference between the outdoor temperature T and the indoor set temperature Tm, which is an air conditioning load equivalent to the air conditioning capacity when _min , is the second limit temperature difference T3. Further, since the second temperature difference limit T3 which changes according to the lowering speed setting RF _2, the second threshold temperature difference T3 is stored in the storage unit 31 in correspondence to the set air volume. Indoor fan motor 22b, the difference between the outdoor temperature T and the indoor set temperature Tm is, if less than the second threshold temperature difference T3 is rotated at a reduced speed setting RF _2. That is, the rotation speed RF of the indoor fan motor 22b, the set in the setting rotational speed RF ₁ in the case of (T-Tm)> T1, T1>(T-Tm)> T3 RF 1> RF in the case of> The rotational speed RF that satisfies RF ₂ is set, and when T3> (T−Tm), the lower rotational speed RF ₂ is set. Further, the rotational frequency RF of the indoor fan motor 22b in the case of T1>(T−Tm)> T3 is set in association with the difference between the outdoor temperature T and the indoor set temperature Tm, and the set air volume. Is set in the control device 30. That is, the rotation speed RF of the indoor fan motor 22b is controlled to a rotation speed set in advance according to the indoor set temperature Tm, the measured outdoor temperature T, and the selected set air volume. Furthermore, lowering speed setting RF ₂ is set to a rotational speed higher than the set rotational speed RF ₁ in set air volume stage below the set air volume of the drop speed setting RF _2.

  Further, the compressor 11 is controlled by the control device 30 so that the air conditioning capability is substantially equal to the air conditioning load. When T1> (T−Tm)> T3, the rotational speed of the indoor fan motor 22b can be specified by the indoor set temperature Tm, the outdoor temperature T, and the set air volume. The number of revolutions is determined by the outdoor temperature T, the indoor set temperature Tm, and the set air volume. Therefore, like the conventional air conditioner, the control device 30 can control the rotation speed of the compressor 11 according to the indoor set temperature Tm, the measured outdoor temperature T, and the selected set air volume.

In the second embodiment, a flowchart for controlling the air conditioning capability will be described. FIG. 18 is a flowchart of the control of the air conditioning capability during the cooling operation according to the air conditioner of the second embodiment. In step S <b> 21, the control device 30 acquires the outdoor temperature T from the outdoor temperature sensor 16. After acquiring the outdoor temperature T, the process proceeds to step S22, and the calculation unit 33 calculates a difference (T−Tm) between the outdoor temperature T acquired in step S21 and the indoor set temperature Tm stored in the storage unit 31. After the calculation of (T−Tm), the process proceeds to step S23, and the determination unit 34 compares the calculation result of (T−Tm) with the threshold temperature difference T1 stored in the storage unit 31 to determine the threshold temperature difference T1. Is high, that is, whether the condition of (T−Tm) <T1 is satisfied. If the condition of step S23 is satisfied, the process proceeds to step S24. In step S24, the determination unit 34 compares the calculation result of (T−Tm) with the second limit temperature difference T3 corresponding to the set air volume stored in the storage unit 31, and (T−Tm) is the second limit. It is determined whether the temperature difference is equal to or less than T3, that is, whether the condition of (T−Tm) ≦ T3 is satisfied. If conditions are satisfied step S24, the process proceeds to step S25, the control unit 32 controls the rotational speed RF of the indoor fan motor 22b to decrease speed setting RF ₂ in accordance with the set air volume. When the condition of step S24 is not satisfied, the process proceeds to step S26, and the control unit 32 satisfies the rotation frequency RF of the indoor fan motor 22b satisfying RF ₁ >RF> RF ₂ , the outdoor temperature T, the indoor set temperature Tm, It is controlled to the set air volume and the rotation speed set in association with it. Further, if the condition is not satisfied in step S23, the process proceeds to step S27, the control unit 32 controls the rotational speed RF of the indoor fan motor 22b to set the rotational speed RF ₁ corresponding to the set air volume. In step S25, step S26, and step S27, after controlling the rotation speed of the indoor fan motor 22b, it progresses to step S28, and the control apparatus 30 controls the rotation speed of the compressor 11 based on the outdoor temperature T and the indoor set temperature Tm. After controlling the rotational speed RC of the compressor 11, the process returns to step S21.

By controlling the air conditioning capability as in the second embodiment, the same effect as in the first embodiment is obtained. Furthermore, had been changed to Embodiment 1, the threshold temperature difference T1 indoor fan motor 22b set rotational speed RF ₁ or lowering speed setting RF ₂ the rotational speed of the boundary of the implementation, in the second embodiment T1> (T In the case of -Tm)> T3, since the rotation speed of the indoor fan motor 22b is changed continuously or stepwise, the indoor air volume is not rapidly changed, and the user is less likely to notice the change in the air volume of the indoor unit.

In the second embodiment, only when T1>(T−Tm)> T3, the rotational frequency RF of the indoor fan motor 22b is set in association with the difference between the outdoor temperature T and the indoor set temperature Tm and the set air volume. However, the present invention is not limited to this, and the outdoor temperature T is set so that the set rotational speed RF ₁ is in the range of (T−Tm)> T1 and the decreased rotational speed RF ₂ is in the range of T3> (T−Tm). Is set in association with the difference (T−Tm) and the set air volume, and after calculating (T−Tm), the air volume is set according to (T−Tm) and the set air volume. Then, the rotational frequency RF of the indoor fan motor 22b may be controlled without comparing (T−Tm) with the threshold temperature difference T1 and the second limit temperature difference T3.

  Similarly to the first embodiment, in the second embodiment, the same control can be performed during the heating operation by deriving the difference between the outdoor temperature T and the indoor set temperature Tm as (Tm−T). FIG. 19 is a flowchart of the control of the air conditioning capability during the heating operation according to the air conditioner of the second embodiment. The only difference from the cooling operation is steps S32, S33 and S34, and steps S31, S35, S36, S37 and S38 are the same as steps S21, S25, S26, S27 and S28, respectively. In step S32, the calculating part 33 calculates the difference (Tm-T) between the preset indoor set temperature Tm and the outdoor temperature T acquired in step S31. After the calculation of (Tm−T), the process proceeds to step S33, and the determination unit 34 compares the calculation result of (Tm−T) with a preset threshold temperature difference T1 to determine whether the threshold temperature difference T1 is higher. That is, it is determined whether the condition of (Tm−T) <T1 is satisfied. If the condition of step S33 is satisfied, the process proceeds to step S34, and if not, the process proceeds to step S37. In step S34, the determination unit 34 compares the calculation result of (Tm−T) with the second limit temperature difference T3 corresponding to the set air volume stored in the storage unit 31, and (Tm−T) is the second limit. It is determined whether the temperature difference is equal to or less than T3, that is, whether the condition of (Tm−T) ≦ T3 is satisfied. If the condition of step S34 is satisfied, the process proceeds to step S35. Otherwise, the process proceeds to step S36.

Further setting, as in the first embodiment, the reduction setting rotational speed RF _2, the rotational speed lower than the set rotational speed RF ₁ in set air volume of the stage of one lower than the set air volume of the drop speed setting RF ₂ This makes it difficult for the user to notice the change in the air volume of the indoor unit. Further, in the case where a plurality of set air volumes can be set, the lower set rotational speed RF ₂ may be set in advance according to each set air volume, or the setting for not controlling the indoor fan motor 22b when controlling the air conditioning capacity. There may be air volume.

Embodiment 3 FIG.
The control of the air conditioning capability in the case of the air conditioner of Embodiment 3 will be described. FIG. 20 is a graph showing the number of rotations of the indoor fan motor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of the third embodiment. FIG. 21 is a graph showing the rotation speed of the compressor with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of the third embodiment. Regarding the configuration of the air conditioner, the storage unit 31 stores the limit temperature difference T2 and the second limit temperature difference T3 for each set air volume, and the determination unit 34 determines the limit temperature difference T2 and the second limit temperature difference T3. Since it is the same as that of Embodiment 1 except for comparing the difference between the outdoor temperature T and the indoor set temperature Tm, it is omitted. Further, the graph showing the air conditioning load and the air conditioning capacity of the air conditioner with respect to the difference between the outdoor temperature and the indoor set temperature during the cooling operation according to the air conditioner of Embodiment 3 is the same as FIG. .

In the air conditioner 1 of the third embodiment, as in the first embodiment, the control device 30 acquires the outdoor temperature T measured by the outdoor temperature sensor 16, and the outdoor set temperature Tm stored in advance is measured. The rotational speeds of the compressor 11 and the indoor fan motor 22b are controlled based on the temperature T, and the air conditioning capability is controlled to be substantially equal to the air conditioning load. Specifically, the indoor fan motor 22b, if the difference between the outdoor temperature T and the indoor set temperature Tm is equal to or higher than the critical temperature difference T2, rotates at the set rotational speed RF ₁ in accordance with the set air amount, than the limit temperature difference T2 If it is smaller, the rotational speed is controlled to decrease continuously or stepwise as the difference between the outdoor temperature T and the indoor set temperature Tm decreases. As with the second embodiment, the rotational speed of the lower limit of the indoor fan motor 22b is set to decrease speed setting RF _2, the rotation speed of the indoor fan motor 22b is reduced speed setting RF ₂ of the compressor 11 the difference of the outdoor temperature T and the indoor set temperature Tm that speed becomes the same air conditioning load and the air conditioning capacity of the case of the minimum rotational speed RC _min becomes the second threshold temperature difference T3. Further, the temperature difference limit T2 is varied in accordance with the set rotation speed RF _1, since the second temperature difference limit T3 which changes according to the lowering speed setting RF _2, limit temperature difference T2 and the second temperature difference limit T3 is It is associated with the set air volume and stored in the storage unit 31. Indoor fan motor 22b, the difference between the outdoor temperature T and the indoor set temperature Tm is, if less than the second threshold temperature difference T3 is rotated at a reduced speed setting RF _2. That is, the rotation speed RF of the indoor fan motor 22b, the set in the setting rotational speed RF ₁ in the case of (T-Tm)> T2, T2>(T-Tm)> T3 RF 1> RF in the case of> The rotational speed RF that satisfies RF ₂ is set, and when T3> (T−Tm), the lower rotational speed RF ₂ is set. In addition, when T2>(T−Tm)> T3, the rotational speed RF of the indoor fan motor 22b is the difference between the outdoor temperature T and the indoor set temperature Tm, the set air volume, and the capacity at the minimum speed of the compressor 11. Further, the storage unit 31 is set so that the air conditioning capacity at the minimum rotational speed of the compressor 11 becomes the rotational frequency RF of the indoor fan motor that is substantially equal to the air conditioning load. Since the capacity at the minimum rotation speed of the compressor 11 is constant if the compressor 11 is the same, the rotation speed RF of the indoor fan motor 22b is set to the indoor set temperature Tm, the measured outdoor temperature T, and the set air volume. Accordingly, the number of revolutions is controlled in advance. Furthermore, lowering speed setting RF ₂ is set to a rotational speed higher than the set rotational speed RF ₁ in set air volume stage below the set air volume of the drop speed setting RF _2.

In the third embodiment, a flowchart for controlling the air conditioning capability will be described. FIG. 22 is a flowchart of control of the air conditioning capability during the cooling operation according to the air conditioner of the third embodiment. In step S <b> 41, the control device 30 acquires the outdoor temperature T from the outdoor temperature sensor 16. After acquiring the outdoor temperature T, the process proceeds to step S42, and the calculation unit 33 calculates the difference (T−Tm) between the outdoor temperature T acquired in step S41 and the indoor set temperature Tm stored in the storage unit 31. After the calculation of (T−Tm), the process proceeds to step S43, and the determination unit 34 compares the calculation result of (T−Tm) with the limit temperature difference T2 stored in the storage unit 31, and determines the limit temperature difference T2 Is high, that is, whether the condition of (T−Tm) <T2 is satisfied. If the condition of step S43 is satisfied, the process proceeds to step S44. In step S44, the determination unit 34 compares the calculation result of (T−Tm) with the second limit temperature difference T3 stored in the storage unit 31, and (T−Tm) is equal to or less than the second limit temperature difference T3. That is, whether or not the condition of (T−Tm) ≦ T3 is satisfied is determined. If conditions are satisfied step S44, the process proceeds to step S45, the control unit 32 controls the rotational speed RF of the indoor fan motor 22b to decrease speed setting RF ₂ in accordance with the set air volume. When the condition of step S44 is not satisfied, the process proceeds to step S46, and the control unit 32 satisfies the rotation frequency RF of the indoor fan motor 22b satisfying RF ₁ >RF> RF ₂ , the outdoor temperature T, the indoor set temperature Tm, The number of rotations is controlled in advance according to the set air volume. Further, if the condition is not satisfied in step S43 advances to step S47, the control unit 32 controls the rotational speed RF of the indoor fan motor 22b to set the rotational speed RF ₁ corresponding to the set air volume. In step S45, step S46 and step S47, after controlling the rotational speed of the indoor fan motor 22b, the process proceeds to step S48, and the rotational speed RC of the compressor 11 is controlled based on the outdoor temperature T, the indoor set temperature Tm, and the set air volume. After the end of control, the process returns to step S41.

  Further, the compressor 11 is controlled by the control device 30 so that the air conditioning capability is substantially equal to the air conditioning load. Also in the case of T2> (T−Tm)> T3, since the rotation speed of the indoor fan motor 22b can be specified by the indoor set temperature Tm, the outdoor temperature T, and the set air volume, the indoor fan motor 22b The number of revolutions is determined by the outdoor temperature T, the indoor set temperature Tm, and the set air volume. Therefore, like the conventional air conditioner, the control device 30 can control the rotation speed of the compressor 11 according to the indoor set temperature Tm, the measured outdoor temperature T, and the selected set air volume.

By controlling the air conditioning capability as in the second embodiment, the same effect as in the first embodiment is obtained. Furthermore, had changed the threshold temperature difference T1 in the first embodiment the rotation speed of the indoor fan motor 22b to set the rotational speed RF ₁ or lowering speed setting RF ₂ as a boundary, the compressor 11 in the third embodiment Since the rotation speed of the indoor fan motor 22b is not changed until the minimum rotation speed _RCmin is reached, the user is less likely to notice a change in the air volume of the indoor unit.

In the third embodiment, only when T2>(T−Tm)> T3, the rotational frequency RF of the indoor fan motor 22b is set in association with the difference between the outdoor temperature T and the indoor set temperature Tm and the set air volume. However, the present invention is not limited to this, and the outdoor temperature T is set so that the set rotational speed RF ₁ is in the range of (T−Tm)> T2 and the decreased rotational speed RF ₂ is in the range of T3> (T−Tm). After the calculation of (T-Tm), the air volume corresponding to (T-Tm) and the set air volume is set. The rotational frequency RF of the indoor fan motor 22b may be controlled without comparing (T−Tm) with the limit temperature difference T2 and the second limit temperature difference T3.

  Similarly to the first embodiment, in the second embodiment, the same control can be performed during the heating operation by deriving the difference between the outdoor temperature T and the indoor set temperature Tm as (Tm−T). FIG. 23 is a flowchart of control of the air conditioning capability during the heating operation according to the air conditioner of the third embodiment. The only difference from the cooling operation is steps S52, S53 and S54, and steps S51, S55, S56, S57 and S58 are the same as steps S41, S45, S46, S47 and S48, respectively. In step S52, the calculation unit 33 calculates a difference (Tm−T) between the preset indoor set temperature Tm and the outdoor temperature T acquired in step S51. After the calculation of (Tm−T), the process proceeds to step S53, and the determination unit 34 compares the calculation result of (Tm−T) with a preset limit temperature difference T2 to determine whether the limit temperature difference T2 is higher. That is, it is determined whether or not the condition of (Tm−T) <T2 is satisfied. If the condition of step S53 is satisfied, the process proceeds to step S54. If not satisfied, the process proceeds to step S57. In step S54, the determination unit 54 compares the calculation result of (Tm−T) with the second limit temperature difference T3 corresponding to the set air volume stored in the storage unit 31, and (Tm−T) is the second limit. It is determined whether the temperature difference is equal to or less than T3, that is, whether the condition of (Tm−T) ≦ T3 is satisfied. When the condition of step S54 is satisfied, the process proceeds to step S55, and when not satisfied, the process proceeds to step S56.

Further setting, as in the first embodiment, the reduction setting rotational speed RF _2, the rotational speed lower than the set rotational speed RF ₁ in set air volume of the stage of one lower than the set air volume of the drop speed setting RF ₂ This makes it difficult for the user to notice the change in the air volume of the indoor unit. Further, in the case where a plurality of set air volumes can be set, the lower set rotational speed RF ₂ may be set in advance according to each set air volume, or the setting for not controlling the indoor fan motor 22b when controlling the air conditioning capacity. There may be air volume.

DESCRIPTION OF SYMBOLS 1 Air conditioner, 10 Outdoor unit, 11 Compressor, 12 Four-way valve, 13 Expansion valve, 14 Outdoor heat exchanger, 15 Outdoor fan, 16 Outdoor temperature sensor, 20 Indoor unit, 21 Indoor heat exchanger, 22 Indoor fan, 22a indoor fan, 22b indoor fan motor, 30 control device, 31 storage unit, 32 control unit, 33 calculation unit, 34 determination unit, 40 operation unit

Claims (5)

A compressor that compresses the refrigerant, an indoor heat exchanger that heats or cools indoor air using the refrigerant, and
An indoor blower for blowing the indoor air to the indoor heat exchanger;
An outdoor temperature sensor for measuring the temperature of outdoor air;
Storage means for storing a preset indoor set temperature;
Control means for controlling the rotation speed of the compressor and the indoor fan,
Wherein, as the difference of the above-mentioned the outdoor temperature measured by the outdoor temperature sensor indoor set temperature is narrowed, after reducing the rotational speed of the indoor blower, and wherein reducing the rotational speed of the compressor Air conditioner to do. The storage means includes a first set air volume, a second set air volume set to be lower than the first set air volume, and a first set rotational speed corresponding to the first set air volume. , A second set speed corresponding to the second set air volume, and a third set speed set to a speed lower than the first set speed and higher than the second set speed. And remember
When the first set air volume is selected as the air volume of the indoor blower, the control means is configured to reduce the outdoor temperature within a range that is equal to or less than the first set speed and equal to or greater than the third set speed. The air conditioner according to claim 1, wherein the rotational speed of the indoor blower is reduced as a difference between an outdoor temperature measured by a sensor and the indoor set temperature is narrowed. The storage means stores a preset threshold temperature difference,
When the difference between the outdoor temperature and the indoor set temperature is equal to or greater than the threshold temperature difference, the control means controls the rotational speed of the indoor fan to the first set rotational speed,
The rotation speed of the indoor blower is controlled to be lower than the first set rotation speed and higher than the third set rotation speed when the difference is smaller than the threshold temperature difference. The air conditioner described.   When the difference between the outdoor temperature and the indoor set temperature is smaller than the threshold temperature difference, the control means decreases the rotational speed of the indoor blower as the difference between the outdoor temperature and the indoor set temperature becomes narrower. The air conditioner according to claim 3, wherein control is performed.   The compressor has a predetermined minimum rotational speed that can be operated,
The control means is configured such that the difference between the outdoor temperature measured by the outdoor temperature sensor and the indoor set temperature is such that the rotational speed of the indoor fan is the first set rotational speed and the rotational speed of the compressor is the minimum rotational speed. In a case where the air conditioning capacity and air conditioning load in a certain case are equal to or greater than a limit temperature difference, the rotational speed of the indoor fan is set to the first set rotational speed, and the rotational speed of the compressor is set to the outdoor temperature and the indoor setting. Control to decrease as the temperature difference narrows,
When the difference between the outdoor temperature measured by the outdoor temperature sensor and the indoor set temperature is smaller than the limit temperature difference, the rotational speed of the compressor is set to the minimum rotational speed, and the rotational speed of the indoor blower is set to the outdoor temperature. The air conditioner according to claim 2, wherein control is performed to reduce the difference in the indoor set temperature as the difference between the indoor set temperatures becomes narrower.

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