JP6045400B2 - Heat source unit of refrigeration cycle apparatus and control method thereof - Google Patents

Description

  The present invention relates to a heat source unit of a refrigeration cycle apparatus and a control method for the heat source unit of a refrigeration cycle apparatus.

  As a heat source unit of a conventional refrigeration cycle apparatus, it is used in a refrigerant circulation circuit in which a compressor, a heat source side heat exchanger, a throttling device, and a load side heat exchanger are connected by piping, and heats the refrigerant and outside air in the refrigerant circulation circuit. Some have a heat source side heat exchanger to be exchanged and a shutter device that receives outside air blown into the heat source side heat exchanger. The shutter device suppresses the outside air blown into the heat source side heat exchanger from affecting the operation of the refrigerant circulation circuit. The opening degree of the shutter device is controlled based on the outside air temperature, the condensation pressure, or the discharge pressure (see, for example, Patent Document 1).

JP-A-5-322329 (paragraph [0008], FIGS. 2 to 5)

  In the heat source unit of the conventional refrigeration cycle apparatus, the opening degree of the shutter apparatus is controlled without taking into account fluctuations in the wind force of the outside air accompanying changes in weather or the like. For this reason, for example, when the refrigerant circuit is performing a cooling operation in a state where the temperature of the outside air is low, if the wind of the outside air is strong, the shutter device will be overopened, the condensation capacity will be excessive, and the load Low-temperature refrigerant flows into the unit, and the operation is stopped by the freeze prevention control. In addition, for example, when the refrigerant circulation circuit is performing a cooling operation in a state where the temperature of the outside air is high, if the wind force of the outside air is weak, the shutter device becomes too closed, the condensation capacity becomes too low, and the high pressure Operation is stopped by the side pressure over-rise prevention control.

  That is, in the heat source unit of the conventional refrigeration cycle apparatus, since the opening degree of the shutter apparatus is controlled without taking into account fluctuations in the wind force of the outside air, the shutter apparatus is in an excessively open state or an excessively closed state. Thus, there has been a problem that excessive or insufficient condensation capacity or evaporation capacity of the heat source side heat exchanger occurs.

  The present invention has been made to solve the above-described problems, and a heat source unit of a refrigeration cycle apparatus in which excessive or insufficient condensation capacity or evaporation capacity of a heat source side heat exchanger is suppressed. The purpose is to obtain. It is another object of the present invention to provide a method for controlling a heat source unit of a refrigeration cycle apparatus in which excessive or insufficient condensation capacity or evaporation capacity of a heat source side heat exchanger is suppressed.

The heat source unit of the refrigeration cycle apparatus according to the present invention is used in a refrigerant circulation circuit in which a compressor, a heat source side heat exchanger, a throttling device, and a load side heat exchanger are connected by piping, and the refrigerant in the refrigerant circulation circuit and the outside air The heat source side heat exchanger that exchanges heat with the outside air, and the outside air is sucked from the suction port, supplied to the heat source side heat exchanger, and blown out from the blowout port, and through the blowout port or the suction port A shutter device that receives the outside air blown into the heat source side heat exchanger, a rotation speed detection sensor that detects the rotation speed of the fan, an outside air temperature sensor that detects the temperature of the outside air, and an opening degree of the shutter device and a control unit for the said control device, based on the rotational speed of the fan detected by the rotational speed detecting sensor, to estimate the wind of the outside air, the estimated the The magnitude of the wind power of the outside air is classified by comparing the wind power of the wind with a preset threshold value, and the temperature of the outside air detected by the outside air temperature sensor and the classified magnitude of the wind power are classified. The opening degree of the shutter device is calculated based on different constants set accordingly .

  In the heat source unit of the refrigeration cycle apparatus according to the present invention, since the opening degree of the shutter device is controlled according to the wind force of the outside air, the fluctuation of the wind force of the outside air is taken into account, so the shutter device is opened too much. It is suppressed that the condensing capacity or the evaporating capacity of the heat source side heat exchanger becomes excessive or insufficient due to the above state or an excessively closed state.

It is a figure which shows schematic structure of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is an external view of an outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. It is an external view of an outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. It is an external view of an outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. It is an external view of an outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. It is an external view of an outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. It is a figure which shows the operation | movement flow of the control apparatus at the time of the driving | operation start of a refrigerant circulation circuit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship of the wind force state, external temperature, and shutter initial opening of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the operation | movement flow of the control apparatus during the driving | operation of the refrigerant circuit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the operation | movement flow of the control apparatus during the driving | operation of the refrigerant circuit of the air conditioning apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the operation | movement flow of the control apparatus during the driving | operation of the refrigerant circuit of the air conditioning apparatus which concerns on Embodiment 3 of this invention.

Hereinafter, the heat source unit of the refrigeration cycle apparatus according to the present invention will be described with reference to the drawings.
In the following, the case where the heat source unit of the refrigeration cycle apparatus according to the present invention is an outdoor unit of an air conditioner will be described, but the heat source unit of the refrigeration cycle apparatus according to the present invention is not limited to such a case. . In the following, a case where the heat source unit of the refrigeration cycle apparatus according to the present invention switches between the cooling operation and the heating operation will be described. However, the heat source unit of the refrigeration cycle apparatus according to the present invention is in such a case. However, the present invention is not limited to this, and only one of the cooling operation and the heating operation may be performed. Moreover, the structure, operation | movement, etc. which are demonstrated below are examples, and the heat source unit of the refrigerating-cycle apparatus which concerns on this invention is not limited to such a structure, operation | movement, etc. Moreover, in each figure, the same code | symbol is attached | subjected to the same or similar member or part. Further, the illustration of the fine structure is simplified or omitted as appropriate. In addition, overlapping or similar descriptions are appropriately simplified or omitted.

Embodiment 1 FIG.
The air conditioning apparatus according to Embodiment 1 will be described.
<Configuration of air conditioner>
Below, the structure of the air conditioning apparatus which concerns on Embodiment 1 is demonstrated.

(Outline configuration)
A schematic configuration of the air-conditioning apparatus according to Embodiment 1 will be described.
FIG. 1 is a diagram showing a schematic configuration of the air-conditioning apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 1, the air conditioner 1 includes an outdoor unit 2 and an indoor unit 3. The outdoor unit 2 and the indoor unit 3 are connected by a pipe, and the refrigerant circulation circuit 4 is formed.

The refrigerant circulating in the refrigerant circuit 4 may be any of HCFC refrigerant such as R22, HFC refrigerant such as R407C, R410A, and R32, natural refrigerant such as CO ₂ , and ammonia.

  The refrigerant circulation circuit 4 is provided with a compressor 11, a four-way valve 12, a heat source side heat exchanger 13, an expansion device 14, a load side heat exchanger 15, and an accumulator 16. The throttle device 14 is, for example, an electronic linear expansion valve. The compressor 11, the four-way valve 12, the heat source side heat exchanger 13, the expansion device 14, and the accumulator 16 are provided in the outdoor unit 2. The load side heat exchanger 15 is provided in the indoor unit 3.

  The outdoor unit 2 is provided with a fan 21 that sucks outside air from the suction port, supplies it to the heat source side heat exchanger 13, and blows it out from the blowout port. The fan 21 is rotated by a fan motor 22. The fan 21 and the fan motor 22 may be between the heat source side heat exchanger 13 and the outlet, or may be between the heat source side heat exchanger 13 and the inlet. The indoor unit 3 is provided with a fan 23 that sucks room air from the suction port, supplies the air to the load-side heat exchanger 15, and blows it out from the blow-out port. The fan 23 is rotated by a fan motor 24.

  A shutter device 25 is provided in at least one of the outlet and the inlet of the outdoor unit 2. Of course, you may provide in both a blower outlet and a suction inlet. The shutter device 25 may be provided at a position for receiving outside air blown into the heat source side heat exchanger 13 through the blowout port or the suction port, and even if provided outside the blowout port or the suction port, the shutter device 25 It may be provided inside. Moreover, the outdoor unit 2 may have a member different from the housing in which the blowout port or the suction port is formed, and the shutter device 25 may be provided on the member.

  The refrigerant circuit 4 includes a pipe temperature sensor 31 that detects the pipe temperature on the discharge side of the compressor 11, a pipe temperature sensor 32 that detects the pipe temperature of the heat source side heat exchanger 13, and the liquid side on the outdoor unit 2 side. A pipe temperature sensor 33 for detecting the pipe temperature, a pipe temperature sensor 34 for detecting the liquid side pipe temperature on the indoor unit 3 side, and a pipe temperature sensor 35 for detecting the pipe temperature of the load side heat exchanger 15 are provided. .

  The outdoor unit 2 is provided with a rotation speed detection sensor 41 that detects the rotation speed of the fan 21. The rotation speed detection sensor 41 may be built in the fan motor 22 or may be externally attached. The outdoor unit 2 is provided with an outside air temperature sensor 42 that detects the temperature of the outside air. The indoor unit 3 is provided with an indoor air temperature sensor 43 that detects the temperature of the indoor air. The outside air temperature sensor 42 and the indoor air temperature sensor 43 may be provided inside the casing or may be provided outside the casing.

  Each sensor transmits the detected information to the control device 51. The control device 51 controls actuators such as the compressor 11, the expansion device 14, and the fan motor 22 based on information received from each sensor. The rotation speed of the fan motor 22 may be variably controlled or fixedly controlled. The rotational speed of the fan 21 is the outside air blown into the fan 21 when the fan motor 22 is energized (that is, when the fan 21 is in operation) and when it is not energized (that is, when the fan 21 is stopped). Fluctuates depending on the wind power. Further, the control device 51 switches the flow path of the four-way valve 12 to switch between the cooling operation and the heating operation of the refrigerant circulation circuit 4. The control device 51 may be provided in the outdoor unit 2, may be provided in the indoor unit 3, or may be provided in addition to them.

  The shutter device 25 has actuators that change the opening thereof, and the actuators are connected to the control device 51. The control device 51 controls the driving of the actuators, that is, the opening degree of the shutter device 25 based on the information received from the rotation speed detection sensor 41 and the outside air temperature sensor 42.

(Configuration of shutter device)
2 to 6 are external views of the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 2, the shutter device 25 may be one that changes its opening degree by changing the angle of the louver (so-called louver method), and as shown in FIGS. 3 and 4. In addition, the position of the aperture may be changed by changing the position of the slide (so-called slide method), and as shown in FIGS. 5 and 6, the position of the diaphragm blades may be changed. The opening degree may be changed (so-called diaphragm blade method), or any other method may be used as long as the opening degree is changed.

<Operation of air conditioner>
Below, operation | movement of the air conditioning apparatus which concerns on Embodiment 1 is demonstrated.

(Schematic operation of refrigerant circulation circuit)
During the cooling operation, the control device 51 switches the flow path of the four-way valve 12 as shown by a solid line in FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the heat source side heat exchanger 13 and exchanges heat with the outside air passing through the heat source side heat exchanger 13 to become a high pressure liquid refrigerant. Leaked. The high-pressure liquid refrigerant flowing out of the heat source side heat exchanger 13 is decompressed by the expansion device 14, becomes a low-pressure gas-liquid two-phase refrigerant, and flows into the load-side heat exchanger 15. The low-pressure gas-liquid two-phase refrigerant flowing into the load-side heat exchanger 15 exchanges heat with the indoor air passing through the load-side heat exchanger 15 and is sucked into the compressor 11 as a low-pressure gas refrigerant. Is done.

  During the heating operation, the control device 51 switches the flow path of the four-way valve 12 as indicated by a dotted line in FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the load-side heat exchanger 15 and exchanges heat with the indoor air passing through the load-side heat exchanger 15, and the high-pressure liquid refrigerant and And then leak. The high-pressure liquid refrigerant flowing out of the load-side heat exchanger 15 is decompressed by the expansion device 14 to become a low-pressure gas-liquid two-phase refrigerant and flows into the heat source-side heat exchanger 13. The low-pressure gas-liquid two-phase refrigerant flowing into the heat source side heat exchanger 13 exchanges heat with the outside air passing through the heat source side heat exchanger 13 and is sucked into the compressor 11 as a low pressure gas refrigerant. The

(Operation of control device at start of operation of refrigerant circulation circuit)
FIG. 7 is a diagram showing an operation flow of the control device at the start of operation of the refrigerant circuit in the air-conditioning apparatus according to Embodiment 1 of the present invention. FIG. 7 shows the case where the refrigerant circuit 4 performs the cooling operation, but the same applies to the case where the heating operation is performed.

As shown in FIG. 7, when there is a cooling operation start command for the refrigerant circulation circuit 4, the control device 51 causes the rotation speed N ₀ (here, the rotation speed is detected) detected by the rotation speed detection sensor 41 in S 101. means the number of rotations per unit time. later the same) receives, acquires the average value AVE ₀ and the variation time count NUM _0, estimate the wind _{I 0} blowing fan 21, the process proceeds to S102 . In S101, the control device 51 receives and acquires the outside air temperature Ta ₀ detected by the outside air temperature sensor 42, and proceeds to S102. The control device 51 constantly receives the rotation speed N ₀ detected by the rotation speed detection sensor 41 or receives a plurality of times only when a start command is issued.

The average value AVE ₀ and the number of fluctuations NUM ₀ are calculated from a plurality of recently detected rotation speeds N ₀ . The average value AVE ₀ may be one revolution number N ₀ detected by the revolution number detection sensor 41. By obtaining the average value AVE _0, the estimation accuracy of the wind force I ₀ blown into the fan 21 is improved. Further, the number of fluctuations NUM ₀ is, for example, that the fluctuation amount of the rotation speed N ₀ detected by the rotation speed detection sensor 41 with respect to the rotation speed N ₀ detected last time is larger than the reference upper limit fluctuation amount. , The number of times within a preset reference period. The wind force I ₀ blown into the fan 21 is estimated by, for example, I ₀ = α1 × AVE ₀ + α2 × NUM ₀ . α1 and α2 are constants. Either one of α1 and α2 may be set to 0 according to the use environment or the like. When both α1 and α2 are not ₀ , the estimation accuracy of the wind force I0 blown into the fan 21 is improved.

The rotation speed N ₀ detected by the rotation speed detection sensor 41 is detected in a state where the fan motor 22 is not energized. Even in the energized state, the difference between the rotational speed N ₀ detected by the rotational speed detection sensor 41 and the rotational speed at the same setting detected at the set rotational speed or no wind is the rotational speed. only to be calculated as the rotational speed N ₀ detected by the detection sensor 41. When it is detected in a state where current is not energized, fluctuations in the rotational speed N ₀ due to factors other than the outside air blowing into the fan 21 are suppressed, and the estimation accuracy of the wind power I ₀ blowing into the fan 21 is improved.

If the outside air temperature Ta ₀ detected by the outside air temperature sensor 42 is acquired in advance, and the time has not passed since the acquisition, the value may be used. Moreover, the outside temperature detected with the other air conditioning apparatus 1 may be diverted. Alternatively, the local air temperature may be acquired using a telecommunication line (so-called Internet) and the outside air temperature Ta ₀ may be estimated from the air temperature.

Controller 51 determines in S102, whether the wind _{I 0} blown into the fan 21 is the threshold value C1 or more. If it is greater than or equal to the threshold C1, the process proceeds to S104, and if not, the process proceeds to S103. Controller 51 determines in S103, whether the wind _{I 0} blown into the fan 21 is the threshold value C2 or more. If it is greater than or equal to the threshold value C2, the process proceeds to S106, and if not, the process proceeds to S108. Note that it may be compared with only one threshold, or may be compared with three or more thresholds.

The control device 51, in S104, determines that the wind is strong state, in S105, to calculate the shutter initial opening _{S 0,} the process proceeds to S110. The shutter initial opening degree S ₀ is calculated as S ₀ = β1 × Ta ₀ + γ1. β1 and γ1 are constants.

The control device 51, in S106, determines that the wind is the medium state, in S107, to calculate the shutter initial opening _{S 0,} the process proceeds to S110. The shutter initial opening degree S ₀ is calculated as S ₀ = β2 × Ta ₀ + γ2. β2 and γ2 are constants. β2> β1 and γ2> γ1.

The control device 51, in S108, determines that the wind is weak state, in S109, to calculate the shutter initial opening _{S 0,} the process proceeds to S110. The shutter initial opening degree S ₀ is calculated as S ₀ = β3 × Ta ₀ + γ3. β3 and γ3 are constants. β3> β2 and γ3> γ2.

The control device 51, in S110, so that the shutter initial opening _{S 0} calculated, to operate the actuators of the shutter device 25, the process proceeds to S111. The control device 51 starts the operation of the compressor 11 in S111, and starts the cooling operation of the refrigerant circulation circuit 4 in S112.

FIG. 8 is a diagram illustrating the relationship among the wind force state, the outside air temperature, and the initial shutter opening degree of the air-conditioning apparatus according to Embodiment 1 of the present invention. In FIG. 8, the horizontal axis represents the outside air temperature Ta ₀ [° C.], and the vertical axis represents the shutter initial opening degree S ₀ [%]. The shutter initial opening degree S ₀ [%] means that 0% is a fully closed state and 100% is a fully open state.

By operating the control device 51 as shown in FIG. 7, as shown in FIG. 8, the wind power I ₀ blown into the fan 21, that is, the outside air blown into the heat source side heat exchanger 13 through the blowout port or the suction port. shutter initial opening S ₀ wind states is taken into account is set.

Incidentally, the shutter initial opening S ₀ may be calculated using another function such as a quadratic function. Moreover, wind I ₀ blown into the fan 21 is not compared to a threshold, the shutter initial opening S ₀ may be changed continuously in accordance with the wind I ₀ blown into the fan 21. In such a case, the shutter initial opening degree S ₀ is calculated by, for example, S ₀ = (β × Ta ₀ + γ) / I ₀ . β and γ are constants.

Further, for example, when the outdoor unit 2 is used in an environment where the temperature of the outside air is small, the initial shutter opening degree S ₀ is simply set as a constant according to the determination of the wind force I ₀ blown into the fan 21. May be. In such a case, for example, if the wind power I ₀ blowing into the fan 21 is determined to be in a strong state, the shutter initial opening degree S ₀ is determined to be δ1, and the wind power I ₀ blowing into the fan 21 is determined to be in a middle state. If it is determined that the shutter initial opening degree S ₀ is δ2 and the wind force I ₀ blown into the fan 21 is weak, the shutter initial opening degree S ₀ is set to δ3. δ1, δ2, and δ3 are constants. When the outside air temperature Ta ₀ detected by the outside air temperature sensor 42 is taken into consideration as in the operation shown in FIG. 7, the shutter initial opening degree S ₀ is further optimized.

(Operation of control device during operation of refrigerant circulation circuit)
FIG. 9 is a diagram showing an operation flow of the control device during operation of the refrigerant circulation circuit of the air-conditioning apparatus according to Embodiment 1 of the present invention. FIG. 9 shows the case where the refrigerant circulation circuit 4 is performing the cooling operation, but the same applies to the case where the refrigerant operation is performed.

In the following description, the description overlapping or similar to the flow shown in FIG. 7 is omitted as appropriate.
As shown in FIG. 9, during the cooling operation of the refrigerant circulation circuit 4, the control device 51 receives the rotation speed N detected by the rotation speed detection sensor 41 in S <b> 201 and determines the initial shutter opening degree S ₀ . A fluctuation amount Na with respect to the rotational speed N ₀ detected by the rotational speed detection sensor 41 at the time of setting is calculated, and the process proceeds to S202. The control device 51 constantly receives the rotational speed N detected by the rotational speed detection sensor 41. The rotation speed N may be received a plurality of times, and the average value AVE may be obtained.

  The rotation speed N detected by the rotation speed detection sensor 41 is detected in a state where the fan motor 22 is energized. The difference between the rotation speed N detected by the rotation speed detection sensor 41 and the rotation speed that is set or the same rotation speed detected when there is no wind is the rotation speed N detected by the rotation speed detection sensor 41. Used. The operation of the fan 21 may be temporarily interrupted, and the rotational speed N detected by the rotational speed detection sensor 41 may be detected in a state where the fan motor 22 is not energized. When detected in the energized state, the cooling operation efficiency of the refrigerant circulation circuit 4 is suppressed from decreasing.

In S202, the control device 51 determines whether or not the variation amount Na is larger than the reference upper limit variation amount Na _Hi . If it is larger, the process proceeds to S204, and if not, the process proceeds to S203. The control device 51, in S203, determines smaller or not than the lower limit fluctuation _{Na Lo} of variation Na becomes the reference. If it is smaller, the process proceeds to S208, and if not, the process proceeds to S206.

In S204, the control device 51 determines that the opening degree of the shutter device 25 is in an excessively open state, and in S205, operates the actuators of the shutter device 25 so that the shutter opening degree S is reached, and proceeds to S210. The shutter opening S is set to S = S ₀ −ε _Na . epsilon _Na is constant.

In S206, the control device 51 determines that the opening degree of the shutter device 25 is in an appropriate state. In S207, the control devices 51 operate the actuators of the shutter device 25 so that the shutter opening degree S is reached, and the process proceeds to S210. The shutter opening S is set to S = _{S 0.}

In S208, the control device 51 determines that the opening degree of the shutter device 25 is too closed. In S209, the control device 51 operates the actuators of the shutter device 25 so that the shutter opening degree S is reached, and the process proceeds to S210. The shutter opening S is set to _S = S ₀ + ε _Na.

  In S210, the control device 51 determines whether or not there is an instruction to stop the cooling operation of the refrigerant circulation circuit 4. If not, the control device 51 proceeds to S201, and if present, proceeds to S211 and ends the cooling operation.

Note that the constant ε _Na may be changed according to the difference between the fluctuation amount Na and the reference upper limit fluctuation amount Na _Hi or the lower limit fluctuation amount Na _Lo . The constant ε _Na may be changed so that the change amount continuously changes according to the difference, or may be changed so that the change amount changes stepwise.

Alternatively, the fluctuation number NUM may be calculated instead of the fluctuation amount Na, and the fluctuation number NUM may be compared with the reference upper limit fluctuation number NUM _Hi or lower limit fluctuation number NUM _Lo . Even in such a case, similarly, it can be determined whether the opening degree of the shutter device 25 is in an excessively open state, an appropriate state, or an excessively closed state.

<Operation of air conditioner>
Below, the effect | action of the air conditioning apparatus which concerns on Embodiment 1 is demonstrated.
In the outdoor unit 2 of the air conditioner 1, since the opening degree of the shutter device 25 is controlled according to the wind force of the outside air, the variation of the wind force of the outside air is taken into account, so the shutter device 25 is opened too much. It is suppressed that the condensing capacity or the evaporating capacity of the heat source side heat exchanger 13 becomes excessive or insufficient due to the above state or an excessively closed state.

  In particular, in recent years, there are cases where the cooling operation is performed even in winter, such as when the air conditioner 1 is used in a server room. In the outdoor unit 2 of the air conditioner 1, even in such a case, it is suppressed that the condensation capacity of the heat source side heat exchanger 13 is excessive.

Further, in the outdoor unit 2 of the air conditioner 1, the wind force of the outside air blown into the heat source side heat exchanger 13 through the blowout port or the suction port is based on the rotation speeds N ₀ and N detected by the rotation speed detection sensor 41. Is estimated. For example, an anemometer can be attached to the outside of the casing of the outdoor unit 2 and the wind force of the outside air blown into the heat source side heat exchanger 13 through the blowout port or the suction port can be estimated from the output. In contrast, when estimated based on the rotational speeds N ₀ and N detected by the rotational speed detection sensor 41 in this way, the air is blown into the heat source side heat exchanger 13 through the blowout port or the suction port. Since the wind power of the outside air is estimated more directly, it is further suppressed that the condensation capacity or the evaporation capacity of the heat source side heat exchanger 13 is excessive or insufficient. Moreover, since existing equipment can be diverted without adding equipment such as an anemometer, the suppression of excessive or insufficient condensation capacity or evaporation capacity of the heat source side heat exchanger 13 is inexpensive. To be realized.

  Further, in the outdoor unit 2 of the air conditioner 1, the opening degree of the shutter device 25 is controlled according to the wind force of the outside air even during the operation of the refrigerant circulation circuit 4. Therefore, even when the wind force of the outside air blown into the heat source side heat exchanger 13 through the blowout port or the suction port fluctuates transiently, the condensation capacity or the evaporation capacity of the heat source side heat exchanger 13 is excessive or insufficient. Is suppressed.

  In addition, the operation | movement at the time of the driving | operation start of the refrigerant | coolant circulation circuit 4 mentioned above and the operation | movement during operation | movement of the refrigerant | coolant circulation circuit 4 mentioned above may be performed together, and only either one may be performed. When the operation at the start of operation of the refrigerant circulation circuit 4 and the operation during operation of the refrigerant circulation circuit 4 described above are performed together, excessive condensation capacity or evaporation capacity of the heat source side heat exchanger 13 or The occurrence of a deficiency is further suppressed.

Embodiment 2. FIG.
An air conditioner according to Embodiment 2 will be described.
Note that, in the following, descriptions that overlap or are similar to those of the first embodiment are appropriately simplified or omitted.

In the first embodiment, the shutter opening degree S is controlled based on the rotation speed N detected by the rotation speed detection sensor 41 during the operation of the refrigerant circulation circuit 4. In the second embodiment, during the operation of the refrigerant circulation circuit 4, the shutter opening degree S is controlled based on the condensation temperature or the evaporation temperature.
<Operation of air conditioner>
Below, operation | movement of the air conditioning apparatus which concerns on Embodiment 2 is demonstrated.
(Operation of control device during operation of refrigerant circulation circuit)
FIG. 10 is a diagram illustrating an operation flow of the control device during operation of the refrigerant circulation circuit in the air-conditioning apparatus according to Embodiment 2 of the present invention. In addition, although FIG. 10 shows the case where the refrigerant circuit 4 is performing the cooling operation, the same applies to the case where the heating operation is performed.

  As shown in FIG. 10, during the cooling operation of the refrigerant circulation circuit 4, the control device 51 receives the piping temperature of the heat source side heat exchanger 13 detected by the piping temperature sensor 32 in S 301, and condenses the temperature. Tc is acquired, and the process proceeds to S302. The control device 51 may always receive the pipe temperature detected by the pipe temperature sensor 32, or may receive it only when there is an instruction to monitor the condensation temperature Tc.

In S302, the control device 51 determines whether or not the condensing temperature Tc is smaller than the lower limit condensing temperature Tc _Lo as a reference. If it is smaller, the process proceeds to S304, and if not, the process proceeds to S303. In S303, the control device 51 determines whether or not the condensation temperature Tc is higher than the reference upper limit condensation temperature Tc _Hi . If it is larger, the process proceeds to S307, and if not, the process proceeds to S306. The reference lower limit condensation temperature Tc _Lo and the reference upper limit condensation temperature Tc _Hi are set according to the operating state of the refrigerant circulation circuit 4. The condensation temperature Tc may be acquired a plurality of times, and the average value thereof may be used.

In S304, the control device 51 determines that the opening degree of the shutter device 25 is too open, and in S305, the actuator of the shutter device 25 is corrected so that the current shutter opening degree S ′ is corrected to the shutter opening degree S. And the process proceeds to S309. The shutter opening S is corrected to S = S′−ζ _Tc . ζ _Tc is a constant.

  In S306, the control device 51 determines that the opening degree of the shutter device 25 is in an appropriate state, does not correct the shutter opening degree, and proceeds to S309.

The control device 51 determines in S307 that the opening degree of the shutter device 25 is too closed, and in S308, the actuator of the shutter device 25 is corrected so that the current shutter opening degree S ′ is corrected to the shutter opening degree S. And the process proceeds to S309. The shutter opening S is corrected to S = S ′ + ζ _Tc .

  In S309, the control device 51 determines whether or not there is an instruction to stop the cooling operation of the refrigerant circulation circuit 4. If not, the control device 51 proceeds to S310, and if present, proceeds to S311 and ends the cooling operation.

  In S310, the control device 51 calculates the elapsed time after being corrected to the shutter opening degree S. If the reference time has elapsed, the process proceeds to S301, and if not, the process proceeds to S309. By providing S310, it is suppressed that the shutter opening S is further corrected before the correction of the shutter opening is reflected in the condensation temperature Tc.

Note that the constant ζ _Tc may be changed according to the difference between the condensation temperature Tc and the reference lower limit condensation temperature Tc _Lo or the upper limit condensation temperature Tc _Hi . The constant ζ _Tc may be changed so that the change amount continuously changes according to the difference, or may be changed so that the change amount changes stepwise.

<Operation of air conditioner>
Below, the effect | action of the air conditioning apparatus which concerns on Embodiment 2 is demonstrated.
When the control device 51 operates as shown in FIG. 10, it is necessary to estimate the wind force of the outside air blown into the heat source side heat exchanger 13 through the blowout port or the suction port during the operation of the refrigerant circulation circuit 4. Therefore, the processing is simplified, and the control of the shutter opening degree is further improved.

Embodiment 3 FIG.
An air conditioner according to Embodiment 3 will be described.
In the following description, descriptions that overlap or are similar to those in Embodiments 1 and 2 are simplified or omitted as appropriate.

  In the first embodiment, the shutter opening degree S is controlled based on the rotation speed N detected by the rotation speed detection sensor 41 during the operation of the refrigerant circulation circuit 4. In the third embodiment, during the operation of the refrigerant circulation circuit 4, the shutter opening degree S is controlled based on the rotation speed N detected by the rotation speed detection sensor 41 and the outside air temperature Ta detected by the outside air temperature sensor 42. Is done.

<Operation of air conditioner>
Below, operation | movement of the air conditioning apparatus which concerns on Embodiment 3 is demonstrated.
(Operation of control device during operation of refrigerant circulation circuit)
FIG. 11 is a diagram illustrating an operation flow of the control device during operation of the refrigerant circuit in the air-conditioning apparatus according to Embodiment 3 of the present invention. In addition, although FIG. 11 shows the case where the refrigerant circulation circuit 4 performs the cooling operation, the same applies to the case where the heating operation is performed.

  As shown in FIG. 11, during the cooling operation of the refrigerant circulation circuit 4, the control device 51 receives the rotational speed N detected by the rotational speed detection sensor 41 in S <b> 401, and average value AVE and the fluctuation thereof. The number of times NUM is acquired, the wind power I blown into the fan 21 is estimated, and the process proceeds to S402. In S401, the control device 51 receives and acquires the outside air temperature Ta detected by the outside air temperature sensor 42, and proceeds to S402. The control device 51 constantly receives the rotational speed N detected by the rotational speed detection sensor 41.

  The wind force I blown into the fan 21 is estimated by, for example, I = α1 × AVE + α2 × NUM. α1 and α2 may be different from α1 and α2 in the operation at the start of operation of the refrigerant circuit. The rotation speed N detected by the rotation speed detection sensor 41 is detected in a state where the fan motor 22 is energized. The difference between the rotation speed N detected by the rotation speed detection sensor 41 and the rotation speed that is set or the same rotation speed detected when there is no wind is the rotation speed N detected by the rotation speed detection sensor 41. Used.

  In S402 to S409, the control device 51 calculates the shutter opening similarly to S102 to S109 in FIG. Note that the threshold value C1, the threshold value C2, β1, γ1, β2, γ2, β3, and γ3 may be different from S102 to S109.

  In S410, the control device 51 operates the actuators of the shutter device 25 so that the calculated shutter opening degree S is reached, and proceeds to S411. In S411, the control device 51 determines whether or not there is an instruction to stop the cooling operation of the refrigerant circulation circuit 4. If not, the control device 51 proceeds to S401, and if present, proceeds to S412 and ends the cooling operation.

<Operation of air conditioner>
Below, the effect | action of the air conditioning apparatus which concerns on Embodiment 3 is demonstrated.
When the control device 51 operates as shown in FIG. 11, the shutter device 25 has an opening degree that takes into account the outside air temperature Ta ₀ detected by the outside air temperature sensor 42 during the operation of the refrigerant circulation circuit 4. Therefore, for example, when the refrigerant circulation circuit 4 is continuously operated for a long time, the control of the shutter opening degree is further improved.

  Although the first to third embodiments have been described above, the present invention is not limited to the description of each embodiment. For example, it is possible to combine the embodiments, the modifications, and the like.

  DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus, 2 outdoor unit, 3 indoor unit, 4 refrigerant circulation circuit, 11 compressor, 12 four-way valve, 13 heat source side heat exchanger, 14 expansion device, 15 load side heat exchanger, 16 accumulator, 21, 23 Fan, 22, 24 Fan motor, 25 Shutter device, 31-35 Piping temperature sensor, 41 Rotational speed detection sensor, 42 Outside air temperature sensor, 43 Indoor air temperature sensor, 51 Control device.

Claims (7)

The heat source side heat exchanger used in a refrigerant circulation circuit in which a compressor, a heat source side heat exchanger, a throttling device, and a load side heat exchanger are pipe-connected, and exchanges heat between the refrigerant in the refrigerant circulation circuit and the outside air; ,
A fan that sucks in the outside air from a suction port, supplies it to the heat source side heat exchanger, and blows it out from a blowout port;
A shutter device that receives the outside air blown into the heat source side heat exchanger through the blowout port or the suction port;
A rotational speed detection sensor for detecting the rotational speed of the fan;
An outside air temperature sensor for detecting the temperature of the outside air;
A control device for controlling the opening of the shutter device;
With
The controller is
Based on the rotational speed of the fan detected by the rotational speed detection sensor, the wind force of the outside air is estimated,
Classifying the magnitude of the wind force of the outside air by comparing the estimated wind force of the outside air with a preset threshold;
The opening degree of the shutter device is calculated based on the temperature of the outside air detected by the outside air temperature sensor and a different constant set according to the classified magnitude of the wind force. A heat source unit of a refrigeration cycle apparatus. The rotational speed of the fan at the start operation of the refrigerant circuit, is detect by the rotational speed detecting sensor,
The heat source unit of the refrigeration cycle apparatus according to claim 1 . The rotational speed of the fan at the start of operation of the refrigerant circuit is detect by the rotation speed detection sensor during the operation stop of the fan,
The heat source unit of the refrigeration cycle apparatus according to claim 2 . Rotational speed of the fan during operation of the refrigerant circuit, is detect by the rotational speed detecting sensor,
The heat source unit of the refrigeration cycle apparatus according to any one of claims 1 to 3 . Rotational speed of the fan during operation of the refrigerant circuit is detect by the rotation speed detection sensor during the operation of the fan,
The heat source unit of the refrigeration cycle apparatus according to claim 4 . A pipe temperature sensor for detecting the pipe temperature of the heat source side heat exchanger;
Wherein the control device, during the operation of the refrigerant circuit, controls the opening of the shutter device based on the piping temperature of the heat source-side heat exchanger detected by the pipe temperature sensor,
The heat source unit of the refrigeration cycle apparatus according to claim 2 or 3 . The heat source side heat exchanger used in a refrigerant circulation circuit in which a compressor, a heat source side heat exchanger, a throttling device, and a load side heat exchanger are pipe-connected, and exchanges heat between the refrigerant in the refrigerant circulation circuit and the outside air; The outside air is sucked from the suction port, supplied to the heat source side heat exchanger, and blown out from the blowout port, and the outside air blown into the heat source side heat exchanger through the blowout port or the suction port is received. A refrigeration cycle apparatus comprising: a shutter device; a rotation speed detection sensor that detects a rotation speed of the fan; an outside air temperature sensor that detects a temperature of the outside air; and a control device that controls an opening degree of the shutter device. A control method of a heat source unit,
Estimating the wind force of the outside air based on the rotational speed of the fan detected by the rotational speed detection sensor;
Classifying the magnitude of the outdoor wind force by comparing the estimated wind force of the outside air with a preset threshold;
Calculating the opening degree of the shutter device based on the temperature of the outside air detected by the outside air temperature sensor and different constants set according to the classified magnitude of the wind force;
A method for controlling a heat source unit of a refrigeration cycle apparatus.

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