JP6297176B2 - Indoor unit and air conditioner using the same - Google Patents

Description

  The present invention relates to an indoor unit that controls a static pressure supplied from an indoor fan to a constant value and an air conditioner using the indoor unit.

  Conventionally, a heat pump system using a refrigerant circuit is known as an air conditioner. In the refrigerant circuit, for example, an outdoor unit including a compressor, an outdoor unit side heat exchanger, an expansion valve, an indoor unit side heat exchanger, and an indoor unit including an indoor fan are connected by a refrigerant pipe. Yes. The refrigerant circuit has a configuration in which an outdoor unit that is a heat source side unit and an indoor unit that is a load side unit are connected by a refrigerant pipe so that the refrigerant circulates. The refrigerant circuit absorbs heat from the air in the air-conditioning target space that is the heat exchange target in the indoor unit-side heat exchanger, evaporates the refrigerant, or dissipates heat to the air in the air-conditioning target space that is the heat exchange target. To condense. Thereby, an air conditioning apparatus performs air conditioning of an air-conditioned space.

  An indoor unit of an air conditioner may be installed in a constant temperature and humidity chamber in which temperature and humidity are controlled to be constant with high accuracy. This indoor unit has a structure in which, for example, an indoor unit-side heat exchanger and an indoor fan that blows air to the indoor unit-side heat exchanger are housed in a housing. As an indoor fan drive system, there is a pulley drive system in which an indoor unit fan and a motor are connected by a pulley and a belt. Since the air volume or static pressure from the indoor fan varies depending on the environment in which the indoor unit is installed, it is necessary to adjust the air volume of the indoor fan according to the local usage environment. In the pulley drive method, the air volume is adjusted by changing the fan rotation speed on the indoor unit side by changing the pulley diameter connected to the fan on the indoor unit side and the pulley diameter connected to the motor side.

  On the other hand, during continuous operation, the air flow from the indoor fan decreases due to an increase in filter pressure loss. In order to suppress the decrease in the air volume, the rotational speed of the indoor fan may be increased. However, in the pulley drive system, the pulley diameter connected to the fan on the indoor unit side and the pulley diameter connected to the motor side cannot be changed during operation.

  Here, in order to make the air volume on the air supply side constant, a humidity control device that controls the air volume on the exhaust side according to the motor load on the air supply side has been proposed (see, for example, Patent Document 1). Japanese Patent Application Laid-Open No. H10-228561 discloses a method for controlling the rotational speed of a fan motor from the relationship between the rotational speed of the motor and the operating current value as a method for controlling the air volume of the intake fan or the exhaust fan to be constant.

JP 2010-139144 A

  As described above, when the indoor unit is continuously operated and the air volume is reduced due to an increase in the pressure loss of the filter, the rotational speed of the fan motor is controlled from the relationship between the rotational speed of the motor and the operating current value, as in Patent Document 1. It is conceivable to use a predetermined air volume. However, when the indoor unit is installed in a constant temperature and humidity chamber, for example, it is required not only to make the air volume constant as in Patent Document 1, but also to obtain a predetermined static pressure with high accuracy.

  This invention was made in order to solve the above problems, and it aims at providing the indoor unit which can control an air volume and a static pressure accurately, and an air conditioning apparatus using the same. Is.

The indoor unit of the present invention includes an indoor heat exchanger that exchanges heat between air and a refrigerant, an indoor fan that blows air to the indoor heat exchanger, a control device that controls the operation of the indoor fan, A remote controller that transmits information to and from the control device, and the control device detects the operation current of the indoor fan, and the operation current detected by the current detection unit Calculated in the air volume calculation unit that calculates the air volume blown from the indoor fan, the storage unit that stores the blower characteristic information indicating the relationship between the air volume and the static pressure for each rotation speed of the indoor fan, and the air volume calculation unit. Based on the air volume and the blower characteristic information stored in the storage unit, a rotation speed setting section that sets the rotation speed of the indoor fan that becomes the set air volume is set in the rotation speed setting section. Times A rotation control unit that drives the indoor fan based on the number, and the remote control has an input unit to which the set air volume is input, and the rotation speed setting unit determines whether the air volume is greater than a lower limit air volume threshold value. has a function of determining whether, with the one in which the rotation speed of the set when the air volume is determined to be smaller than the lower air volume threshold, obtains the set air Ryo及beauty set Teisei圧from the remote controller To do.

  According to the indoor unit of the present invention and the air conditioner using the indoor unit, the indoor fan whose air volume becomes the set air volume based on the air volume calculated in the air volume calculating unit and the blower characteristic information stored in the storage unit. By setting the number of rotations, even if there is a change in air volume due to pressure loss, the number of rotations is adjusted so that the set air volume and static pressure are set using the blower characteristic information. It can be controlled with high accuracy.

It is a refrigerant circuit diagram which shows the air conditioning apparatus using the indoor unit in Embodiment 1 of this invention. It is a perspective view which shows an example of the indoor unit in Embodiment 1 of this invention. FIG. 3 is a block diagram illustrating an example of a control device and a remote controller in the indoor unit of FIG. It is a graph which shows an example of the air blower characteristic information (air volume-static pressure characteristic) memorize | stored in the memory | storage part of FIG. It is a graph which shows an example of the setting of the rotation speed in the control apparatus of FIG. It is a graph which shows an example of the automatic air volume control in the control apparatus of FIG. It is a flowchart which shows the operation example at the time of the initial setting in the control apparatus of FIG. FIG. 8 is a flowchart showing an example of automatic air volume control in the control device of FIG. It is a flowchart which shows an example of the automatic air volume control in Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the indoor unit of the present invention will be described with reference to the drawings. FIG. 1 is a refrigerant circuit diagram illustrating an air conditioner using an indoor unit according to Embodiment 1 of the present invention. The air conditioner 1 in FIG. 1 has an outdoor unit 10 that is a heat source side unit and an indoor unit 20 that is a usage side unit, and the outdoor unit 10 and the indoor unit 20 constitute a refrigerant circuit connected by a refrigerant pipe. ing. The refrigerant circuit is filled with a refrigerant, and the air conditioner 1 performs air conditioning harmony by circulating the refrigerant in the refrigerant pipe.

  The outdoor unit 10 includes a compressor 11, a flow path switch 12, an outdoor heat exchanger 13, and a supercooling heat exchanger 14. An operation valve 17 a is connected to a refrigerant pipe connected to the indoor unit 20. 17b is provided. The compressor 11 compresses the refrigerant to high temperature and high pressure. The flow path switch 12 is composed of, for example, a four-way valve, and switches the connection relationship in the refrigeration cycle circuit according to the operating state such as cooling operation or heating operation. The outdoor heat exchanger 13 is composed of, for example, a fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins, and performs heat exchange between the refrigerant and the outdoor air. The outdoor heat exchanger 13 acts as a condenser during the cooling operation, and acts as an evaporator during the heating operation.

  The supercooling heat exchanger 14 is composed of, for example, a double pipe heat exchanger, and supercools the refrigerant flowing from the outdoor heat exchanger 13 to the indoor unit 20 during the cooling operation. The refrigerant pipe between the supercooling heat exchanger 14 and the indoor unit 20 is branched and connected to the outdoor expansion valve 15, and the refrigerant flowing out of the outdoor expansion valve 15 flows into the supercooling heat exchanger 14 and the accumulator 16. Is connected to the suction side of the compressor 11. The accumulator 16 stores refrigerant and is connected to the suction side of the compressor 11 and the flow path switch 12.

  The indoor unit 20 includes an indoor heat exchanger 21, an indoor fan 22, and an indoor expansion device 23. The indoor side heat exchanger 21 is configured by, for example, a fin-and-tube heat exchanger configured by heat transfer tubes and a large number of fins. One of the indoor side heat exchangers 21 is connected to the flow path switch 12 of the outdoor unit 10, and the other is connected to the indoor expansion device 23. The indoor side heat exchanger 21 acts as an evaporator during the cooling operation, and acts as a condenser during the heating operation. The indoor fan 22 blows air to the indoor heat exchanger 21 and is driven to rotate by inverter control, for example. The indoor fan 22 can adjust the air volume by changing the rotation speed. The indoor expansion device 23 is constituted by, for example, an electronic expansion valve, and adjusts the refrigerant flow rate by setting the opening, and functions as a pressure reducing valve or an expansion valve to decompress and expand the refrigerant.

  Furthermore, the indoor unit 20 includes a control device 40 that controls the operation of the indoor fan 22 described above, and a remote controller 30 that is connected to the control device 40 in a wired or wireless manner so that information can be transmitted. The remote control 30 transmits information received from the user to the control device 40, and the control device 40 controls the operation of the indoor unit 20 based on the information sent from the remote control 30. Further, the control device 40 transmits the operating status of the indoor unit 20 to the remote controller 30, and the remote controller 30 displays the operating status of the indoor unit 20 and notifies the user.

  With reference to FIG. 1, the flow of the refrigerant | coolant in the case of a cooling operation is demonstrated as an operation example of the air conditioning apparatus 1. FIG. The refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 13 through the flow path switch 12 and is heat-exchanged in the outdoor heat exchanger 13. The refrigerant heat-exchanged in the outdoor heat exchanger 13 is subcooled in the supercooling heat exchanger 14 and then flows into the indoor unit 20. At this time, a part of the refrigerant flows into the supercooling heat exchanger 14 via the outdoor expansion valve 15 and flows into the accumulator 16. Thereafter, the refrigerant flowing into the indoor unit 20 is decompressed by the indoor expansion device 23 and flows into the indoor heat exchanger 21. In the indoor heat exchanger 21, the refrigerant exchanges heat with the indoor air to cool the indoor air. Thereafter, the refrigerant flowing out of the indoor heat exchanger 21 is stored in the accumulator 16 via the flow path switch 12 of the outdoor unit, and the refrigerant stored in the accumulator 16 is sucked into the compressor 11 again.

  FIG. 2 is a perspective view showing an example of the indoor unit 20 in the embodiment of the present invention. The indoor unit 20 has a structure in which an indoor heat exchanger 21 and an indoor fan 22 are accommodated in, for example, a rectangular housing 20A. An indoor fan 22 is installed above the indoor heat exchanger 21, and a control device 40 is installed below the indoor heat exchanger 21. The indoor fan 22 has a fan body 22a and a motor 22b, and the fan body 22a and the motor 22b are directly connected.

  The fan main body 22a is made of, for example, a sirocco fan, and has an air outlet 22x disposed on the upper surface side of the housing 20A. The fan body 22a is rotationally driven by the drive of the motor 22b. Then, an air flow from the lower side of the indoor heat exchanger 21 toward the outlet 22x is formed in the housing 20A. In addition, the air which blows off from the blower outlet 22x is supplied to the indoor load side by direct blowing or duct connection. The operation of the indoor fan 22 is controlled by the control device 40.

  FIG. 3 is a block diagram showing an example of a remote controller and a control device in the indoor unit of FIG. The remote controller 30 in FIG. 3 includes an input unit 31 that includes buttons and the like for receiving input from the user, a display unit 32 that displays the operation status of the indoor unit, and remote control that controls operations of the input unit 31 and the display unit 32. And a remote control communication unit 34 that transmits information by wire or wireless between the control unit 40 and the control unit 40. In addition, in the remote control 30, the input part 31 and the display part 32 may consist of touch panels. In particular, the set air volume Qs and the set static pressure Ps of the indoor unit 20 are input from the user to the input unit 31 of the remote controller 30, and the remote controller communication unit 34 sets the set air volume Qs and the set static pressure Ps input to the input unit 31. Is transmitted to the control device 40.

  The control device 40 controls the operation of the indoor fan 22 based on the operating current I supplied to the indoor fan 22, and includes a rotation control unit 41, a current detection unit 42, an air volume calculation unit 43, and a rotation speed setting unit 44. A storage unit 45 is provided. In addition, the control device 40 transmits information to and from the remote control communication unit 34 of the remote control 30 via the control communication unit 46. The rotation control unit 41 controls the operation of the indoor fan 22 and, for example, controls the indoor fan 22 with an inverter. At this time, the rotation control unit 41 controls the indoor fan 22 so that the rotation number N set in the rotation number setting unit 44 is reached.

  The current detector 42 detects the operating current I supplied to the motor 22b of the indoor fan 22. For example, in a power supply circuit that supplies input power to the motor 22b, a current sensor for detecting an operation current I to the motor 22b is installed, and the current detection unit 42 uses the operation current I detected by the current sensor. get. The current detector 42 detects the operating current I at a predetermined sampling period T. This sampling period T may be set in the current detection unit 42 in advance, or may be set by the user on the remote controller 30.

  The air volume calculation unit 43 calculates the air volume Q blown from the indoor fan 22 based on the operating current I detected by the current detection unit 42. That is, when the motor 22b is inverter-controlled as described above, the air volume Q and the operating current I have a predetermined relationship. The air volume calculation unit 43 stores the relationship between the operating current I and the air volume Q according to the model of the indoor fan 22 and the like, and calculates the air volume Q based on the operating current I. For example, when the filter pressure loss increases due to filter clogging or the like, the air volume Q decreases, and when the air volume Q decreases, the operating current I decreases.

  The rotational speed setting unit 44 determines the rotational speed N of the indoor fan 22 at which the air volume Q becomes the set air volume Qs based on the air volume Q calculated by the air volume calculator 43 and the blower characteristic information stored in the storage unit 45. It is to set. Here, the setting air volume Qs and the setting static pressure Ps are set by the remote controller 30 when the indoor unit 20 is initially set, for example.

  FIG. 4 is a graph showing an example of blower characteristic information (air volume-static pressure characteristic) stored in the storage unit of FIG. In FIG. 4, the horizontal axis indicates the amount of air blown from the indoor fan 22, and the vertical axis indicates the static pressure. The storage unit 45 stores blower characteristic information for each horsepower. In FIG. 4, the difference between the total static pressure and the in-machine resistance of the indoor unit 20 is the static pressure.

FIG. 5 is a graph showing an example of setting of the rotational speed in the control device of FIG. 3, and the setting of the rotational speed based on the set air volume Qs and the set static pressure Ps will be described with reference to FIG. For example, it is assumed that the set air volume Qs = 90 [m ³ / min] and the set static pressure Ps = 245 [Pa] are transmitted as unit information from the remote controller 30 to the control communication unit 46. The rotation speed setting unit 44 derives in-machine resistance = 115 [Pa] when the air volume = 90 [m ³ / min] from the blower characteristic information. Then, the rotational speed setting unit 44 calculates that the required total static pressure is 115 [Pa] +245 [Pa] = 360 [Pa] by adding the in-machine resistance and the set static pressure Ps. 700 [rpm] at which the pressure is 360 [Pa] is set as the rotation speed N of the indoor fan 22. Then, the rotation control unit 41 controls the indoor fan 22 to rotate at the rotation number N = 700 [rpm] calculated by the rotation number setting unit 44.

  As described above, the rotation speed setting unit 44 acquires the set air volume Qs and the set static pressure Ps at the initial setting, and sets the initial rotation speed Ns based on the blower characteristic information, the set air volume Qs, and the set static pressure Ps. calculate. At this time, the air volume calculation unit 43 has a function of calculating the initial operating current Is from the set air volume Qs. Then, the initial rotational speed Ns and the initial operating current Is are transmitted to the remote controller 30 via the control communication unit 46, and the display unit 32 of the remote controller 30 displays the initial rotational speed Ns and the initial operating current Is.

  Here, when the filter pressure loss due to filter clogging or the like increases in the indoor unit 20 during continuous operation, the air volume Q decreases. Even if the air volume Q decreases, the set static pressure Ps cannot be obtained when the rotation control unit 41 controls the rotation with the initial rotation speed Ns at the initial setting. Therefore, the control device 40 has a function of automatically controlling the air volume. Specifically, the rotation speed setting unit 44 sets the rotation speed N based on the air volume Q during the automatic air volume control of the indoor unit 20.

FIG. 6 is a graph showing an example of automatic air volume control in the control device of FIG. As shown in FIG. 5, in the state where the set air volume Qs is set to 90 [m ³ / min], the in-machine resistance of the indoor unit 20 is increased from the initial in-machine resistance R0 to the in-machine resistance R1 due to filter pressure loss or the like. . At this time, the air volume Q decreases from 90 [m ³ / min] to 85 [m ³ / min]. Taking 10 horsepower cooling as an example, this results in a 1.5% reduction in capacity. Further, when the rotational speed N = 700 [rpm] and the air volume Q = 85 [m ³ / min], the static pressure is higher than when the rotational speed N = 700 [rpm] and the air volume Q = 90 [m ³ / min]. Will grow. Therefore, the set static pressure Ps is not obtained and the capacity is reduced. Therefore, the rotation speed setting unit 44 sets the rotation speed N that is increased by an amount corresponding to the increase in the in-machine resistance in order to suppress a decrease in performance.

  Specifically, the rotation speed setting unit 44 calculates an increase in the in-machine resistance from the blower characteristic information, the rotation speed N, and the air volume Q, and derives the rotation speed N taking into account the calculated increase in the in-machine resistance. In the case of FIG. 6 described above, the rotation speed setting unit 44 changes the rotation speed N of the indoor fan 22 from N = 700 [rpm] to the rotation speed N = 800 [rpm]. In this way, by making it possible to grasp at which point on the blower characteristic information it is possible to adjust the rotational speed N of the indoor fan 22 so as to obtain the set air volume Qs and the set static pressure Ps. It is possible to control the air volume and static pressure uniformly with high accuracy.

  The control device 40 has a function of transmitting the above-described adjusted rotational speed N, operating current I, static pressure, and air volume Q to the remote controller 30 via the control communication unit 46. The unit 33 causes the display unit 32 to display the changed rotation speed N, operating current I, static pressure, and air volume Q. Thereby, the user can grasp the operating status of the indoor unit 20 from the remote controller 30.

  Further, the rotation speed setting unit 44 has a function of determining whether or not the calculated rotation speed N is larger than the set maximum rotation speed Nmax. This set maximum rotation speed Nmax is the maximum rotation speed of the indoor fan 22 limited by the fan main body 22a and the motor 22b. When the rotational speed N is larger than the set maximum rotational speed Nmax, it means that the indoor unit 20 is in a state where the set air volume Qs cannot be obtained due to filter pressure loss. When the rotational speed N is greater than the set maximum rotational speed Nmax, the rotational speed setting unit 44 transmits a message indicating that the air volume is decreasing to the remote controller 30 via the control communication unit 46. Then, an alarm indicating that the air volume has decreased is displayed on the display unit 32 of the remote controller 30.

  The rotation speed setting unit 44 has a function of adjusting the rotation speed N when the air volume Q calculated by the air volume calculation section 43 is larger than the lower limit air volume threshold Qmin. The lower limit air volume threshold value Qmin is set to a value smaller than the set air volume Qs, and is input from the user via the input unit 31 of the remote controller 30, for example. The lower limit air volume threshold value Qmin may be set in the storage unit 45 in advance. At this time, the rotation speed setting unit 44 performs control so that the air volume Q is larger than the lower limit air volume threshold Qmin and smaller than the set air volume Qs (Qmin <Q <Qs). In other words, the rotation speed setting unit 44 does not adjust the rotation speed N until the air volume Q becomes equal to or lower than the lower limit air volume threshold Qmin. Thereby, it can suppress that the rotation speed N is changed frequently.

  FIG. 7 is a flowchart showing an operation example at the time of initial setting in the control device of FIG. 3, and the initial setting of the control device 40 will be described with reference to FIGS. First, unit information (horsepower, set air volume Qs, set static pressure Ps) is input to the remote controller 30 (step ST1). The unit information input to the remote controller 30 is transmitted from the remote controller 30 to the control device 40 (step ST2).

  Thereafter, in the rotational speed setting unit 44 of the control device 40, the initial rotational speed Ns of the indoor fan 22 is determined from the blower characteristic information for each horsepower in the storage unit 45, the set air volume Qs and the set static pressure Ps transmitted from the remote controller 30. Is calculated (see FIGS. 4 and 5). Further, the initial operation current Is is calculated in the air volume calculation unit 43. Then, the initial rotational speed Ns and the initial operating current Is are stored in the storage unit 45 and transmitted to the remote controller 30 (step ST3). When reception of the initial rotational speed Ns and the initial operating current Is is completed in the remote controller 30, “initial value setting completion” is displayed on the remote controller 30 on the display unit 32 of the remote controller 30 (step ST4). Thereby, the initial setting of the indoor fan 22 is completed.

  Next, a trial run of the indoor fan 22 is performed (step ST5). First, the operation of the indoor fan 22 at the initial rotational speed Ns is started, and it is determined whether or not the rotational speed N of the fan is the initial rotational speed Ns (step ST6). When the rotational speed N of the fan is not the initial rotational speed Ns (NO in step ST6), the operating frequency of the motor 22b is adjusted and controlled to be the initial rotational speed Ns. On the other hand, when the rotation speed N of the fan reaches the initial rotation speed Ns (YES in step ST6), counting of a predetermined continuous operation time (for example, 30 minutes) starts (step ST7). Here, the continuous operation time of 30 minutes is the time required for the operation current I of the motor 22b to stabilize. If it stops due to a power outage, reset the timer and try again from the beginning.

  Next, the operating current I of the motor 22b after the continuous operation time has elapsed is detected. Since the operating current I of the motor 22b varies, the current detection unit 42 determines whether the operating current I during the trial operation is within a predetermined range (for example, 95 [%] to 105 [%]) of the initial operating current Is. (Step ST8). If the operating current I during the trial operation is out of the predetermined range of the initial operating current Is (NO in step ST8), the static pressure is adjusted so as to be within the predetermined range (step ST9). This static pressure adjustment is performed using a known technique such as adjusting the angle of a damper (not shown) or the opening of the shutter, for example, at the air outlet 22x. For example, when the air-conditioned space and the indoor fan 22 are connected via a duct, the external resistance varies depending on the length of the duct, so the static pressure may be adjusted according to the environment to be used. On the other hand, if the operating current I during the test operation is within a predetermined range of the initial operating current Is (YES in step ST8), the operation is stopped and the test operation is completed.

  FIG. 8 is a flowchart showing an example of automatic air volume control in the control device of FIG. First, the sampling period T and the lower limit air volume threshold value Qmin are input from the user to the input unit 31 of the remote controller 30. The input sampling cycle T and lower limit air volume threshold value Qmin are transmitted from the remote controller 30 to the control device 40 (step ST11). Then, the operation of the indoor fan 22 is started (step ST12).

  The control device 40 starts measuring the count time from the start of operation, and determines whether the count time is longer than the sampling period T (step ST13). If the count time is less than or equal to the sampling period T (NO in step ST13), the count of the accumulated count time is continued without resetting the timer. On the other hand, when the count time becomes longer than the sampling period T (YES in step ST13), the operating current I is detected by the current detector 42, and the air volume Q based on the operating current I is calculated by the air volume calculator 43. (Step ST14).

  Thereafter, the rotational speed setting unit 44 determines whether or not the air volume Q is smaller than the lower limit air volume threshold Qmin (step ST15). When the air volume Q is equal to or greater than the lower limit air volume threshold Qmin (NO in step ST15), it is determined that the adjustment of the rotation speed N is unnecessary, the timer of the sampling period T is reset (step ST16), and the count time is measured again. Performed (step ST13). On the other hand, when the air volume Q is smaller than the lower limit air volume threshold Qmin (YES in step ST15), the rotational speed setting unit 44 calculates the rotational speed N of the indoor fan 22 that becomes the set air volume Qs and the set air volume Qs (step). ST17).

  Then, the rotation speed setting unit 44 determines whether or not the rotation speed N is larger than the set maximum rotation speed Nmax (step ST18). When the rotation speed N is equal to or less than the set maximum rotation speed Nmax (NO in step ST18), the rotation control unit 41 drives and controls the indoor fan 22 using the rotation speed N calculated by the rotation speed setting unit 44. At this time, the timer of the sampling period T is reset (step ST16), and the count time is counted again. On the other hand, when the rotational speed N is larger than the set maximum rotational speed Nmax (YES in step ST18), it is determined that the indoor unit 20 is in a state where it is not possible to secure an air volume exceeding the lower limit air volume threshold Qmin due to clogging or the like. An air volume drop alarm is displayed (step ST19), and the automatic air volume adjustment control ends.

  According to the first embodiment, based on the air volume Q calculated by the air volume calculation unit 43 and the blower characteristic information stored in the storage unit 45, the rotational speed of the indoor fan 22 where the air volume Q becomes the set air volume Qs. By setting N, the rotational speed N is adjusted so that the set air volume Qs and the set static pressure Ps are obtained using the blower characteristic information even when the air volume changes due to pressure loss. The pressure can be controlled with high accuracy. That is, by providing the air volume automatic adjustment mode, the air volume range required by the user can be achieved. Capability change can be suppressed by setting the air volume range required by the user. In particular, in an environment used for constant temperature and humidity applications, for example, this leads to an improvement in controllability.

Embodiment 2. FIG.
FIG. 9 is a flowchart of automatic air volume control according to Embodiment 2 of the present invention, and an operation example of air volume automatic adjustment will be described with reference to FIG. In the automatic air volume control in FIG. 9, parts having the same steps as in FIG. The difference between the second embodiment of FIG. 9 and the first embodiment is the operation after the rotation speed N becomes larger than the set maximum rotation speed Nmax.

  That is, when the rotation speed N calculated by the rotation speed setting unit 44 is larger than the set maximum rotation speed Nmax (YES in step ST18), the rotation speed setting unit 44 sets the rotation speed N = the set maximum rotation speed Nmax ( Step ST20). When the indoor fan 22 rotates at the set maximum rotation speed Nmax, the rotation speed setting unit 44 determines whether or not the air volume Q is smaller than the lower limit air volume threshold Qmin (step ST21).

  When the air volume Q is equal to or greater than the lower limit air volume threshold Qmin (NO in step ST21), the rotation control unit 41 controls the indoor fan 22 using the rotation speed N = the set maximum rotation speed Nmax. This difference, the timer of the sampling period T is reset (step ST16), and the count time is measured again. On the other hand, when the air volume Q becomes smaller than the lower limit air volume threshold value Qmin, an air volume lower than the lower limit air volume threshold value Qmin cannot be secured, so an air volume lowering alarm is displayed on the remote controller 30 and the air volume automatic adjustment control is terminated.

  According to the second embodiment, the continuous operation can be continued for a longer time without stopping the operation of the indoor unit 20. That is, especially when used in a constant temperature and humidity application, since it is operated for 24 hours, it is necessary to avoid stopping the operation as much as possible. Therefore, even when the rotational speed N becomes larger than the set maximum rotational speed Nmax, the continuous operation time can be further extended so that the operation is continued if the air volume Q equal to or higher than the lower limit air volume threshold Qmin can be secured. Further, when the air volume Q becomes smaller than the lower limit air volume threshold value Qmin, an alarm is displayed on the remote controller 30 so that the filter can be regularly checked. Further, in the case of the second embodiment, as in the case of the first embodiment, even if a change in the air volume due to the pressure loss occurs, the fan is rotated so that the set air volume Qs and the set static pressure Ps are obtained using the air blower characteristic information. Since the number N is adjusted, the air volume and the static pressure can be accurately controlled.

  The first embodiment of the present invention is not limited to the first embodiment. For example, in the first embodiment, the case where the number of indoor fans 22 and the number of motors 22b is one is illustrated, but the same control can be performed even when the number of indoor fans 22 and the number of motors 22b is two. Is possible.

  DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus, 10 outdoor unit, 11 compressor, 12 flow path switcher, 13 outdoor heat exchanger, 14 supercooling heat exchanger, 15 outdoor expansion valve, 16 accumulator, 17a, 17b operation valve, 20 indoor Machine, 20A housing, 21 indoor heat exchanger, 22 indoor fan, 22a fan body, 22b motor, 22x air outlet, 23 indoor throttle device, 30 remote control, 31 input section, 32 display section, 33 remote control control section, 34 remote control communication unit, 40 control device, 41 rotation control unit, 42 current detection unit, 43 air volume calculation unit, 44 rotation speed setting unit, 45 storage unit, 46 control communication unit, I operation current, Is initial operation current, N rotation Number, Nmax maximum rotation speed, Ns initial rotation speed, Ps setting static pressure, Q air volume, Qmin lower limit air volume threshold, Qs setting air volume, R0, R1 In-machine resistance, T Sampling cycle.

Claims (6)

An indoor heat exchanger that exchanges heat between air and refrigerant;
An indoor fan for blowing air to the indoor heat exchanger;
A control device for controlling the operation of the indoor fan;
A remote controller for transmitting information to and from the control device,
The controller is
A current detector for detecting an operating current of the indoor fan;
An air volume calculating section that calculates an air volume blown from the indoor fan from the operating current detected in the current detecting section;
A storage unit storing blower characteristic information indicating a relationship between the air volume and the static pressure for each rotation speed of the indoor fan;
Based on the air volume calculated in the air volume calculating section and the blower characteristic information stored in the storage section, a rotation speed setting section that sets the rotation speed of the indoor fan at which the air volume becomes a set air volume;
A rotation control unit that drives the indoor fan based on the rotation number set in the rotation number setting unit;
The remote control has an input unit for inputting the set air volume,
The rotation speed setting unit has a function of determining whether or not the air volume is larger than a lower limit air volume threshold, and sets the rotation speed when it is determined that the air volume is smaller than a lower limit air volume threshold. together with the indoor unit and acquires the set air Ryo及beauty set Teisei圧from the remote control.   The rotation control unit performs a test operation in a state where the set air volume and the set static pressure are acquired from the remote controller, and stores the set air volume, the set static pressure, and the operating current during the test operation in the storage unit. Item 2. The indoor unit according to Item 1.   The rotation speed setting unit has a function of determining whether or not the rotation speed of the indoor fan is greater than a set maximum rotation speed, and when the rotation speed of the indoor fan is greater than a set maximum rotation speed, The indoor unit according to claim 1 or 2, which outputs that the air volume has decreased. An indoor heat exchanger that exchanges heat between air and refrigerant;
An indoor fan for blowing air to the indoor heat exchanger;
A control device for controlling the operation of the indoor fan,
The controller is
A current detector for detecting an operating current of the indoor fan;
An air volume calculating section that calculates an air volume blown from the indoor fan from the operating current detected in the current detecting section;
A storage unit storing blower characteristic information indicating a relationship between the air volume and the static pressure for each rotation speed of the indoor fan;
Based on the air volume calculated in the air volume calculating section and the blower characteristic information stored in the storage section, a rotation speed setting section that sets the rotation speed of the indoor fan at which the air volume becomes a set air volume;
A rotation control unit that drives the indoor fan based on the rotation number set in the rotation number setting unit;
The storage unit stores the relationship between the air volume and the total static pressure for each rotation speed and the relationship between the air volume and the in-machine resistance as the blower characteristic information.
The rotation speed setting unit sets the rotation speed of the indoor fan so that the total static pressure determined by the rotation speed of the indoor fan becomes a value obtained by adding the in-machine resistance and the set static pressure. An indoor heat exchanger that exchanges heat between air and refrigerant;
An indoor fan for blowing air to the indoor heat exchanger;
A control device for controlling the operation of the indoor fan,
The controller is
A current detector for detecting an operating current of the indoor fan;
An air volume calculating section that calculates an air volume blown from the indoor fan from the operating current detected in the current detecting section;
A storage unit storing blower characteristic information indicating a relationship between the air volume and the static pressure for each rotation speed of the indoor fan;
Based on the air volume calculated in the air volume calculating section and the blower characteristic information stored in the storage section, a rotation speed setting section that sets the rotation speed of the indoor fan at which the air volume becomes a set air volume;
A rotation control unit that drives the indoor fan based on the rotation number set in the rotation number setting unit;
The rotation speed setting unit has a function of determining whether or not the rotation speed of the indoor fan is greater than a set maximum rotation speed, and the rotation speed of the indoor fan is greater than a set maximum rotation speed and the air volume is a lower limit air volume threshold If larger, the indoor unit is configured to set the rotation speed of the indoor fan to a set maximum rotation speed. The indoor unit according to any one of claims 1 to 5,
An air conditioner having an outdoor unit connected to the indoor unit via a refrigerant pipe and forming a refrigerant circuit together with the indoor unit.

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