JP7195461B2 - air conditioner - Google Patents

Description

The present disclosure relates to an air conditioner that controls the number of revolutions of an outdoor fan.

2. Description of the Related Art Conventionally, noise generated by outdoor fans has been reduced in air conditioners. In Patent Document 1, when the operating frequency of the compressor provided in the outdoor unit is near the lower limit, for example, 30 Hz to 40 Hz, the number of rotations of the outdoor fan is reduced, or when there are multiple outdoor fans, the number of operating units is reduced. A technique for reducing noise is disclosed.

Japanese Utility Model Laid-Open No. 64-25658

However, according to the prior art described above, there is no description of reducing the rotational speed of the outdoor fan until the operating frequency of the compressor reaches the lower limit range. Therefore, until the operating frequency of the compressor reaches near the lower limit, there is a problem that the outdoor fan continues to generate a large amount of noise due to the high rotation speed of the outdoor fan.

Unlike Patent Document 1, a method of quickly reducing the noise of the outdoor fan by reducing the rotational speed of the outdoor fan without changing the operating frequency of the compressor is conceivable. However, when the number of revolutions of the outdoor fan is decreased, at a certain stage, the upper limit of the operating frequency of the compressor is restricted in order to protect the compressor. In this case, there is a problem that the required air conditioning capacity may be insufficient in the air conditioner.

The present disclosure has been made in view of the above, and an object thereof is to obtain an air conditioner capable of reducing noise generated by an outdoor fan while ensuring necessary air conditioning capacity.

In order to solve the above-described problems and achieve the object, the air conditioner according to the present disclosure includes a compressor that adjusts the operating frequency and compresses the refrigerant flowing in the refrigerant circuit, and adjusts the rotation speed to heat the refrigerant. By controlling the outdoor fan that cools the outdoor heat exchanger to be exchanged, the operating frequency of the compressor, and the number of revolutions of the outdoor fan, the number of revolutions of the outdoor fan is preferentially reduced while ensuring the necessary air conditioning capacity. and a control unit that implements noise operation. Based on the difference between the indoor set temperature and the indoor suction temperature of the indoor unit, the control unit determines whether or not a required capacity line is set, which specifies the operating frequency and rotation speed to ensure the required air conditioning capacity. If determined, the required capacity line is set based on the operating mode of the air conditioner and the outside air temperature, the compressor is controlled so that the operating frequency is equal to or higher than the operating frequency specified by the required capacity line, and the Control the outdoor fan so that the number of revolutions is higher than that.

The air conditioner according to the present disclosure has the effect of being able to reduce the noise generated by the outdoor fan while ensuring the required air conditioning capacity.

A diagram showing a configuration example of an air conditioner according to the present embodiment. FIG. 1 shows an example of a soundproofing material included in the air conditioner according to the present embodiment; A second diagram showing an example of a soundproof material included in the air conditioner according to the present embodiment. A diagram showing a required capacity line set by the control unit of the air conditioner according to the present embodiment. Flowchart showing the operation of the control unit of the air conditioner according to the present embodiment for determining the required capacity line based on the operation mode of the air conditioner and the outside air temperature A diagram showing transition of the operating frequency of the compressor and the rotation speed of the outdoor fan by the control unit of the air conditioner according to the present embodiment. Flowchart showing control of rotation speed of outdoor fan using radiator plate temperature by control unit of air conditioner according to the present embodiment 3 is a flow chart of control of the rotation speed of the outdoor fan using the condensing temperature by the control unit of the air conditioner according to the present embodiment; FIG. 4 is a diagram showing control of the rotation speed of the outdoor fan based on the heat sink temperature and condensation temperature by the control unit of the air conditioner according to the present embodiment; A diagram showing changes in noise value due to an outdoor fan in the air conditioner according to the present embodiment. FIG. 4 is a diagram showing control performed after the control unit of the air conditioner according to the present embodiment reduces the noise of the outdoor fan; Flowchart showing determination of whether or not the required capacity line is required by the control unit of the air conditioner according to the present embodiment A diagram showing transition of the operating frequency of the compressor and the rotational speed of the outdoor fan when the controller of the air conditioner according to the present embodiment determines that the air conditioning capacity is not required. A diagram showing transition of the operating frequency of the compressor when it is determined that the air conditioning capacity is required after determining that the air conditioning capacity is not required in the control unit of the air conditioner according to the present embodiment. A diagram showing an example of a hardware configuration that realizes a control unit included in the air conditioner according to the present embodiment.

Air conditioners according to embodiments of the present disclosure will be described in detail below with reference to the drawings. In addition, this disclosure is not limited by this embodiment.

Embodiment.
FIG. 1 is a diagram showing a configuration example of an air conditioner 30 according to the present embodiment. The air conditioner 30 includes an outdoor unit 31 and an indoor unit 32 . FIG. 1 specifically shows the configuration of a refrigeration cycle extending over an outdoor unit 31 and an indoor unit 32 in an air conditioner 30. As shown in FIG. The outdoor unit 31 includes a compressor 1, a four-way valve 2, an outdoor fan 3, an outdoor heat exchanger 4, an expansion valve 5, a pipe 7, a radiator plate 8, a radiator plate temperature sensor 9, and an outdoor two A phase tube temperature sensor 10 , an outdoor liquid tube temperature sensor 11 , an outside air temperature sensor 16 , and a control section 17 are provided. The indoor unit 32 includes an indoor heat exchanger 6, a pipe 7, an indoor two-phase tube temperature sensor 12, an indoor liquid tube temperature sensor 13, an indoor preset temperature storage unit 14, and an indoor suction temperature sensor 15. . In the air conditioner 30, the compressor 1, the four-way valve 2, the outdoor heat exchanger 4, the expansion valve 5, the radiator plate 8, and the indoor heat exchanger 6 are connected by pipes 7 to form a refrigerant circuit 18. .

The compressor 1 has its operating frequency adjusted by inverter control by the control unit 17 and compresses the refrigerant flowing through the refrigerant circuit 18 . The four-way valve 2 changes the direction in which the refrigerant flows when the operation mode of the air conditioner 30, that is, switching between cooling and heating. The outdoor fan 3 cools the outdoor heat exchanger 4 by adjusting the rotational speed under the control of the control unit 17 . The outdoor heat exchanger 4 performs heat exchange of refrigerant as a condenser and an evaporator. Expansion valve 5 reduces the pressure of the refrigerant. The radiator plate 8 has a role of releasing heat from a control board that controls the operation of the outdoor unit 31 . A radiator plate temperature sensor 9 detects the temperature of the radiator plate 8 , which is the temperature of the radiator plate. The outdoor two-phase tube temperature sensor 10 detects the temperature of the outdoor heat exchanger 4 . The outdoor liquid pipe temperature sensor 11 detects the temperature of the liquid refrigerant. The outside air temperature sensor 16 detects the outside air temperature around the outdoor unit 31 . The control unit 17 controls the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 to ensure the necessary air conditioning capacity of the air conditioner 30, while preferentially lowering the rotation speed of the outdoor fan 3 to reduce noise. carry out driving. The control unit 17 may be mounted on the aforementioned control board.

The indoor heat exchanger 6 performs heat exchange of refrigerant as a condenser and an evaporator. The indoor two-phase tube temperature sensor 12 detects the temperature of the indoor heat exchanger 6 . The indoor liquid pipe temperature sensor 13 detects the temperature of the liquid refrigerant. The indoor set temperature storage unit 14 stores a desired set temperature for the air conditioner 30 set by the user using a remote controller (not shown) or the like. The indoor suction temperature sensor 15 detects the indoor suction temperature near the suction port of the indoor unit 32 .

The air conditioner 30 may be equipped with a soundproof material 19 that is wound directly around the compressor 1 as shown in FIG. A type of sound deadening material 20 that runs along the machine room may be provided. FIG. 2 is a diagram showing an example of the soundproof material 19 included in the air conditioner 30 according to this embodiment. FIG. 3 is a diagram showing an example of the soundproof material 20 included in the air conditioner 30 according to this embodiment. 3A shows a state in which the outdoor unit 31 is not equipped with the soundproof material 20 as a comparative example, and FIG. 3B shows a state in which the outdoor unit 31 is equipped with the soundproof material 20. FIG.

FIG. 4 is a diagram showing a required capacity line set by the control unit 17 of the air conditioner 30 according to the present embodiment. In FIG. 4 , the horizontal axis indicates the operating frequency of the compressor 1 and the vertical axis indicates the rotation speed of the outdoor fan 3 . The required capacity line defines the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 in order to ensure the required air conditioning capacity of the air conditioner 30 . The content of the required capacity line varies depending on the operation mode of the air conditioner 30 and the outside air temperature. In the example of FIG. 4, K1 indicates a cooling rated capacity line that is a required capacity line under cooling rated conditions, and K2 indicates a heating rated capacity line that is a required capacity line under heating rated conditions. Further, K3 indicates a cooling high outside air capacity line that is a required capacity line under high cooling outside air conditions, and K4 indicates a heating low outside air capacity line that is a required capacity line under heating low outside air conditions. Further, K5 indicates a cooling low outside air capacity line which is a required capacity line under cooling low outside air conditions, and K6 indicates a heating high outside air capacity line which is a required capacity line under heating high outside air conditions.

For the required capacity line of each condition, the control unit 17 uses the coefficient for each condition of the outside air temperature set in advance in the storage area, the operating frequency of the compressor 1 based on the outside temperature, and the maximum rotation speed of the outdoor fan. 3, the operating frequency of the compressor 1 for each rotational speed is calculated and set by the following equation (1). The coefficient for each outside air temperature condition and the operating frequency of the compressor 1 based on the outside air temperature were obtained by, for example, the user or the manufacturer of the air conditioner 30 through actual machine tests under each outside temperature condition. Determined based on actual measurements.

Operating frequency of compressor 1 = Coefficient for each outdoor temperature condition x (Outdoor fan rotation speed - Outdoor fan maximum rotation speed) + Operating frequency of compressor 1 for each outdoor temperature condition (1)

A method by which the control unit 17 determines the required capacity line based on the operation mode of the air conditioner 30 and the outside air temperature detected by the outside air temperature sensor 16 will be described. As an example, the operation modes of the air conditioner 30 are cooling and heating. FIG. 5 is a flow chart showing the operation of the controller 17 of the air conditioner 30 according to the present embodiment for determining the required capacity line according to the operation mode of the air conditioner 30 and the outside air temperature. In the flowchart shown in FIG. 5, the low outdoor air cooling threshold, the high outdoor air cooling threshold, the low outdoor air heating threshold, and the high outdoor air heating threshold are determined from test results conducted in advance by the user or the manufacturer of the air conditioner 30. It is assumed that each threshold is determined and set in the control unit 17 .

The control unit 17 determines whether the operation mode of the air conditioner 30 is cooling or heating (step S101). In the case of cooling (step S101: Yes), the controller 17 compares the outside air temperature with a low outside air cooling threshold (step S102). If the outside air temperature≦the low outside air cooling threshold (step S102: Yes), the control unit 17 sets the cooling low outside air capacity line K5 as the required capacity line (step S103). If low outside air cooling threshold<outside temperature (step S102: No), the controller 17 compares the outside air temperature with a high outside air cooling threshold (step S104). If low outside air cooling threshold<outside temperature≤high outside air cooling threshold (step S104: Yes), the control unit 17 sets the cooling rated capacity line K1 as the required capacity line (step S105). If high outside air cooling threshold<outside temperature (step S104: No), the controller 17 sets a high cooling capacity line K3 as the required capacity line (step S106).

In the case of heating (step S101: No), the controller 17 compares the outside air temperature with a low outside air heating threshold (step S107). If the outside air temperature≦the low outside air heating threshold (step S107: Yes), the controller 17 sets the heating low outside air capacity line K4 as the required capacity line (step S108). If low outside air heating threshold<outside temperature (step S107: No), the controller 17 compares the outside air temperature with a high outside air heating threshold (step S109). If low outside air heating threshold<outside temperature≦high outside air heating threshold (step S109: Yes), the controller 17 sets the heating rated capacity line K2 as the required capacity line (step S110). If high outside air heating threshold<outside temperature (step S109: No), the controller 17 sets a high outside air heating capacity line K6 as the required capacity line (step S111).

FIG. 6 is a diagram showing transition of the operating frequency of the compressor 1 and the rotational speed of the outdoor fan 3 by the control unit 17 of the air conditioner 30 according to the present embodiment. Here, as an example, a graph is shown when the operation mode of the air conditioner 30 is cooling and the outside air temperature is the rated condition. Therefore, the required capacity line of L1 shown in FIG. Become.

Moreover, FIG. 6 shows the relationship between the operating frequency of the compressor 1 and the rotational speed of the outdoor fan 3, and the magnitude of the noise value. The region F1 has a large noise value because both the operating frequency of the compressor 1 and the rotational speed of the outdoor fan 3 are high. In region F2, the operating frequency of the compressor 1 is low, but the rotation speed of the outdoor fan 3 is high, so the noise value is a middle region. In region F3, the operating frequency of the compressor 1 is high, but the noise is reduced by the soundproof materials 19, 20, etc., and the rotational speed of the outdoor fan 3 is slightly low. Become. In region F4, the operating frequency of the compressor 1 is low and the rotational speed of the outdoor fan 3 is slightly low, so the noise value is small. In region F5, the rotation speed of the outdoor fan 3 is low, but the operating frequency of the compressor 1 is high, so the noise value is a middle region. In region F6, the operating frequency of the compressor 1 and the rotational speed of the outdoor fan 3 are both low, so the noise value is small.

In FIG. 6 , L2 indicates the timing point at which the air conditioner 30 enters steady operation, that is, the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 . In the present embodiment, the control unit 17 does not perform noise reduction control for a certain period of time after the air conditioning apparatus 30 is started, and starts noise reduction control at the timing of entering steady operation. . This is because the air conditioner 30 performs predetermined control so that the compressor 1 does not deviate from the safe operating range at the initial start of the compressor 1 . The control unit 17 performs control to change, that is, decrease the rotation speed of the outdoor fan 3 as indicated by L3 when L2 at which the air conditioner 30 enters steady operation is set as the starting point.

The control unit 17 determines the change in the rotational speed of the outdoor fan 3 indicated by L3 using the heat sink temperature detected by the heat sink temperature sensor 9 and the condensation temperature. Here, when the operation mode of the air conditioner 30 is cooling, the condensing temperature is the temperature detected by the outdoor two-phase tube temperature sensor 10 and the outdoor liquid tube temperature sensor 11, whichever is higher. When the operation mode of the air conditioner 30 is heating, the condensing temperature is set to the temperature detected by the indoor two-phase tube temperature sensor 12 or the indoor liquid tube temperature sensor 13, whichever is higher. That is, the condensing temperature is the temperature detected by the temperature sensor installed in the indoor unit 32 or the outdoor unit 31 , which is defined by the operation mode of the air conditioner 30 .

First, the control unit 17 uses the radiator plate temperature detected by the radiator plate temperature sensor 9 to determine whether the rotation speed of the outdoor fan 3 is decreased, maintained, or increased. FIG. 7 is a flowchart showing control of the number of revolutions of the outdoor fan 3 using the heat sink temperature by the controller 17 of the air conditioner 30 according to the present embodiment. In the flowchart shown in FIG. 7, the first fan rotation speed down threshold value and the first fan rotation speed up threshold value are determined by the user or the manufacturer of the air conditioner 30 based on the results of tests conducted in advance. and is set in the control unit 17. The control unit 17 compares the temperature of the radiator plate with the first fan speed reduction threshold (step S201). If the radiator plate temperature<the first fan rotation speed down threshold (step S201: Yes), the control unit 17 determines that the first fan rotation speed is down (step S202). If the first fan rotation speed down threshold ≦ the radiator plate temperature (step S201: No), the control unit 17 compares the radiator plate temperature with the first fan rotation speed increase threshold (step S203). If the first fan rotation speed down threshold <= the radiator plate temperature < the first fan rotation speed up threshold (step S203: Yes), the control unit 17 determines that the first fan rotation speed is maintained (step S204). . If the first fan speed-up threshold value≦heat radiator plate temperature (step S203: No), the control unit 17 determines that the first fan speed-up state is established (step S205). Note that the controller 17 does not change the rotation speed of the outdoor fan 3 at this time.

Next, the control unit 17 uses the condensation temperature to determine whether the rotation speed of the outdoor fan 3 is decreased, maintained, or increased. FIG. 8 is a flow chart showing control of the rotational speed of the outdoor fan 3 using the condensation temperature by the controller 17 of the air conditioner 30 according to the present embodiment. In the flowchart shown in FIG. 8, the second fan rotation speed down threshold value and the second fan rotation speed up threshold value are determined by the user or the manufacturer of the air conditioner 30 based on the results of tests conducted in advance. and is set in the control unit 17. The controller 17 compares the condensing temperature with the second fan rotational speed down threshold (step S301). If the condensing temperature<the second fan rotation speed down threshold (step S301: Yes), the controller 17 determines that the second fan rotation speed is down (step S302). If the second fan rotation speed down threshold value≦condensing temperature (step S301: No), the controller 17 compares the condensation temperature with the second fan rotation speed up threshold value (step S303). If the second fan rotation speed down threshold value≦the condensation temperature<the second fan rotation speed up threshold value (step S303: Yes), the control unit 17 determines that the second fan rotation speed is maintained (step S304). If the second fan rotation speed increase threshold value≦condensing temperature (step S303: No), the control unit 17 determines that the second fan rotation speed increase state is established (step S305).

The control unit 17 displays the determination result of the first fan rotation speed down state, the first fan rotation speed maintenance state, or the first fan rotation speed increase state obtained using the heat sink temperature as shown in FIG. The determination result of the second fan rotation speed down state, the second fan rotation speed maintenance state, or the second fan rotation speed up state obtained by applying the condensing temperature is applied to FIG. FIG. 9 is a diagram showing control of the rotational speed of the outdoor fan 3 based on the radiator plate temperature and the condensation temperature by the controller 17 of the air conditioner 30 according to the present embodiment. The control unit 17 determines whether to decrease the fan rotation speed, maintain the fan rotation speed, or increase the fan rotation speed based on the result of applying each determination result to FIG. In the example of FIG. 9, in the case of the first fan rotational speed down state and the second fan rotational speed down state, the fan rotational speed is reduced. In addition, in the case of the first fan speed-up state or the second fan speed-up state, and in the case of the first fan speed-up state and the second fan speed-up state, the fan speed is increased. In other cases, the fan rotation speed is maintained. When the fan rotation speed is decreased, the control unit 17 reduces the upper limit value of the rotation speed of the outdoor fan 3 by a specified number. In the case of maintaining the fan rotation speed, the control unit 17 maintains the current upper limit value of the rotation speed of the outdoor fan 3 . When the fan rotation speed is increased, the control unit 17 increases the upper limit value of the rotation speed of the outdoor fan 3 by a specified number.

The control unit 17 implements the change in the rotational speed of the outdoor fan 3 indicated by L3 in FIG. 6 by the operations shown in FIGS. 7 to 9 . The control unit 17 repeatedly performs the operations shown in FIGS. 7 to 9 at prescribed time intervals. When the control unit 17 decreases the upper limit value of the rotation speed of the outdoor fan 3 by the operation of L3 in FIG. Decrease frequency. By the control unit 17 repeatedly performing the operations of L3 and L4, in the air conditioner 30, the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 are stabilized at the point L5 where the required capacity line of L1 is reached. .

Thus, in the present embodiment, the control unit 17 controls the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 as shown in FIG. It is possible to shorten the time spent in the region F1 where the noise value is large. FIG. 10 is a diagram showing changes in noise value due to the outdoor fan 3 in the air conditioner 30 according to the present embodiment. In FIG. 10, the horizontal axis indicates time, and the vertical axis indicates noise value. In FIG. 10, the dashed line P1 indicates the transition of the noise value under the control of Patent Document 1 as a comparative example, and P2 indicates the transition of the noise value of the air conditioner 30 under the control of the control unit 17 of the present embodiment. . In FIG. 10, the region P3 indicates the noise value difference. It can be seen that in P2, that is, in the present embodiment, the number of revolutions of the outdoor fan 3 is rapidly decreased, and the time period during which the noise value is high can be kept short.

After making the transition to L5 as shown in FIG. 6, the control unit 17 repeats the transition within the same region as shown in FIG. FIG. 11 is a diagram showing control performed by the control unit 17 of the air conditioner 30 according to the present embodiment after the noise of the outdoor fan 3 is reduced. First, when the controller 17 determines that the air conditioning capacity is required at the point of L5, it increases the operating frequency of the compressor 1 as indicated by Q1. After that, the control unit 17 determines a change in the rotation speed of the outdoor fan 3 as described above, and changes the rotation speed of the outdoor fan 3 as indicated by Q2. Next, the control unit 17 reduces the operating frequency of the compressor 1 as indicated by Q3 by restricting the prevention of excessive rise in condensation temperature. The control unit 17 determines a change in the rotation speed of the outdoor fan 3 as the operating frequency of the compressor 1 decreases, and changes the rotation speed of the outdoor fan 3 as indicated by Q4. As shown in FIG. 11, the control unit 17 changes the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 near the required capacity line, thereby performing air conditioning at the minimum required rotation speed of the outdoor fan 3. Operation of the device 30 can be continued. Thus, the control unit 17 controls the rotation speed of the outdoor fan 3 by changing the upper limit rotation speed of the outdoor fan 3 based on the outdoor radiator plate temperature and the condensation temperature. The controller 17 reduces the operating frequency of the compressor 1 when the upper limit rotation speed of the outdoor fan 3 is reduced.

Next, a method for setting or canceling the required performance line by the control unit 17 will be described. The control unit 17 sets or cancels the required capacity line depending on whether or not the air conditioning capacity is required. FIG. 12 is a flowchart showing determination of whether or not the required capacity line is required by the control unit 17 of the air conditioner 30 according to the present embodiment. First, the control unit 17 calculates the absolute value ΔTj of the difference between the indoor set temperature stored in the indoor set temperature storage unit 14 and the indoor intake temperature detected by the indoor intake temperature sensor 15 (step S401). The control unit 17 stores the calculated absolute value ΔTj of the difference. The control unit 17 calculates the difference ΔFj between the absolute value ΔTj of the difference one minute ago and the absolute value ΔTj of the current difference (step S402). When ΔFj>0 (step S403: Yes), the control unit 17 determines that the air conditioning capacity is required, and sets the required capacity line (step S404). The method of setting the required capacity line is as described above. When ΔFj≦0 (step S403: No), the control unit 17 determines that the air conditioning capacity is not required, and does not set the required capacity line (step S405).

Thus, the control unit 17 determines whether or not the required capacity line is set based on the difference between the indoor set temperature and the indoor suction temperature of the indoor unit 32 . When determining that the required capacity line needs to be set, the control unit 17 sets the required capacity line based on the operation mode of the air conditioner 30 and the outside air temperature. The control unit 17 controls the compressor 1 so that the operating frequency is equal to or higher than the required capacity line, and controls the outdoor fan 3 so that the rotational speed is equal to or higher than the required capacity line.

The transition of the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 by the control unit 17 when the air conditioning capacity is not required will be described. FIG. 13 is a diagram showing transitions of the operating frequency of the compressor 1 and the rotational speed of the outdoor fan 3 when the controller 17 of the air conditioner 30 according to the present embodiment determines that the air conditioning capacity is not required. As shown in FIG. 13, the control unit 17 does not set a lower limit value according to the required capacity line of L1. Thus, the operating frequency of the compressor 1 can be reduced.

FIG. 14 is a diagram showing the transition of the operating frequency of the compressor 1 when the control unit 17 of the air conditioner 30 according to the present embodiment determines that the air conditioning capacity is required after determining that the air conditioning capacity is not required. . When the required capacity line of L1 is set with R4 as an initial point, the control unit 17 sets the lower limit value of the operating frequency of the compressor 1 on the required capacity line L1, and as indicated by R5, the required capacity The operating frequency of the compressor 1 is transitioned, that is, increased so as to exceed the lower limit indicated by line L1. After that, the control unit 17 changes the operating frequency of the compressor 1 and the rotational speed of the outdoor fan 3 as shown in FIG. 11 .

In this way, by setting and canceling the required capacity line, the control unit 17 does not operate with excessive air conditioning capacity when air conditioning capacity is not required, and air conditioning is performed with the minimum required air conditioning capacity. Operation of the device 30 is enabled.

Next, the hardware configuration of the controller 17 included in the air conditioner 30 will be described. FIG. 15 is a diagram showing an example of a hardware configuration that implements the controller 17 included in the air conditioner 30 according to the present embodiment. Control unit 17 is implemented by processor 201 and memory 202 .

The processor 201 is a CPU (Central Processing Unit, central processing unit, processor, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)), or system LSI (Large Scale Integration). The memory 202 is a non-volatile or volatile memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), EEPROM (Registered Trademark) (Electrically Erasable Programmable Read-Only Memory). can be exemplified. Moreover, the memory 202 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc).

As described above, according to the present embodiment, in the air conditioner 30, the control unit 17 preferentially reduces the rotation speed of the outdoor fan 3, and the noise value is large as in the area F1 shown in FIG. The noise of the outdoor fan 3 can be reduced by controlling so as not to stay in the area. At this time, the control unit 17 sets the required capacity line as necessary. The control unit 17 operates the air conditioner 30 so that the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 do not fall below the required capacity line, thereby preventing a situation in which the air conditioning capacity is insufficient due to prioritizing low noise. can be avoided.

The configurations shown in the above embodiments are only examples, and can be combined with other known techniques, or can be combined with other embodiments, without departing from the scope of the invention. It is also possible to omit or change part of the configuration.

REFERENCE SIGNS LIST 1 compressor 2 four-way valve 3 outdoor fan 4 outdoor heat exchanger 5 expansion valve 6 indoor heat exchanger 7 piping 8 radiator plate 9 radiator plate temperature sensor 10 outdoor two-phase tube temperature sensor 11 Outdoor liquid tube temperature sensor 12 Indoor two-phase tube temperature sensor 13 Indoor liquid tube temperature sensor 14 Indoor set temperature storage unit 15 Indoor suction temperature sensor 16 Outside air temperature sensor 17 Control unit 18 Refrigerant circuit 19, 20 Soundproof material, 30 air conditioner, 31 outdoor unit, 32 indoor unit.

Claims (5)

a compressor that adjusts the operating frequency and compresses the refrigerant flowing through the refrigerant circuit;
an outdoor fan that adjusts the rotation speed and cools an outdoor heat exchanger that exchanges heat with the refrigerant;
a control unit that controls the operating frequency of the compressor and the rotation speed of the outdoor fan, and preferentially lowers the rotation speed of the outdoor fan to perform low-noise operation while ensuring necessary air conditioning capacity; ,
with
Based on the difference between the indoor set temperature and the indoor suction temperature of the indoor unit, the control unit determines whether or not the required capacity line, which defines the operating frequency and the rotational speed, is set in order to ensure the required air conditioning capacity. If it is determined that it is necessary, a required capacity line is set based on the operation mode of the air conditioner and the outside air temperature, the compressor is controlled so that the operating frequency is equal to or higher than that specified by the required capacity line, and the necessary controlling the outdoor fan so that the number of revolutions is equal to or higher than that specified by the capacity line;
Air conditioner. The control unit uses the coefficient for each condition of the outside air temperature determined based on the actual measurement value, the operating frequency of the compressor based on the outside air temperature, and the maximum fan rotation speed of the outdoor fan. Calculate the operating frequency of the compressor for each rotation speed and set the required capacity line;
The air conditioner according to claim 1 . The control unit is installed in the indoor unit or the outdoor unit specified by the outdoor heat sink temperature, which is the temperature of the heat sink that releases the heat of the control board that controls the operation of the outdoor unit, and the operation mode of the air conditioner. Based on the condensation temperature detected by the temperature sensor detected, the upper limit rotation speed of the outdoor fan is changed to control the rotation speed of the outdoor fan.
The air conditioner according to claim 1 or 2 . a compressor that adjusts the operating frequency and compresses the refrigerant flowing through the refrigerant circuit;
an outdoor fan that adjusts the rotation speed and cools an outdoor heat exchanger that exchanges heat with the refrigerant;
a control unit that controls the operating frequency of the compressor and the rotation speed of the outdoor fan, and preferentially lowers the rotation speed of the outdoor fan to perform low-noise operation while ensuring necessary air conditioning capacity; ,
with
The control unit is installed in the indoor unit or the outdoor unit specified by the temperature of the outdoor heat sink, which is the temperature of the heat sink that releases the heat of the control board that controls the operation of the outdoor unit, and the operation mode of the air conditioner. changing the upper limit rotation speed of the outdoor fan based on the condensation temperature detected by the temperature sensor, and controlling the rotation speed of the outdoor fan;
Air conditioner. The control unit reduces the operating frequency of the compressor when the upper limit rotation speed of the outdoor fan is reduced.
The air conditioner according to claim 4.

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