CN105091254B - control device - Google Patents

Abstract

A control device for controlling a refrigeration apparatus having a main fan and an auxiliary fan, the refrigeration apparatus including an outdoor unit (20) and a booster fan (32) attached to the outdoor unit (20) for assisting an outdoor fan (25), the outdoor unit having an outdoor heat exchanger and the outdoor fan (25) for supplying outdoor air to the outdoor heat exchanger and being capable of changing the number of rotations, fan drive degrees out of a plurality of fan drive degrees for the outdoor fan (25) are determined in advance as a start drive corresponding value for starting the driving of the booster fan (32), and the determined start drive corresponding value is corrected in accordance with the driving or stopping condition of the booster fan (32), thereby enabling to suppress an increase in power consumption when a desired air volume is obtained.

Description

control device

technical field

The present invention relates to a control device.

Background technique

In the prior art, when a refrigeration device includes a heat source unit having a main fan whose rotational speed can be changed, an auxiliary fan is also provided on the heat source unit in order to assist the main fan. For example, in the refrigeration apparatus disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2013-50222 ), an outdoor fan corresponding to a main fan and an auxiliary fan corresponding to an auxiliary fan are interlocked and controlled so that both are driven at the same rotational speed.

However, for example, when the desired air volume is small during low-load operation, the desired air volume may be obtained by driving only the main fan. In this case, if not only the main fan but also the auxiliary fan is driven, the power consumption may increase.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a control device capable of suppressing an increase in power consumption when a desired air volume is obtained in a refrigeration apparatus including a main fan and an auxiliary fan.

The control device according to the first aspect of the present invention is a control device for controlling a cooling device including a heat source unit and an auxiliary fan attached to the heat source unit in order to assist the main fan. The heat source unit includes a heat source side heat exchanger and a main fan whose rotation speed can be changed to supply outdoor air to the heat source side heat exchanger. The control device includes a memory unit and a correction unit. One rotation number indication value among a plurality of rotation number indication values of the main fan is pre-stored in the memory unit, and the rotation number indication value is used as a start driving corresponding value for starting the driving of the auxiliary fan. The correction unit corrects the determined value corresponding to the start of driving according to the drive or stop state of the auxiliary fan.

In the control device according to the first aspect of the present invention, one of the plurality of rotational speed indication values of the main fan pre-stored in the memory section is determined as a value corresponding to the start of driving of the auxiliary fan, and the correction section is based on the rotation of the auxiliary fan. The drive or stop condition correction starts to drive the corresponding value. In this control device, since the predetermined value corresponding to the start of driving of the auxiliary fan is corrected according to the driving or stop status of the auxiliary fan, the rotation number indication value of the main fan at the time of starting to drive the auxiliary fan changes, and as a result, the driving of the auxiliary fan is started. The air volume of the main fan will change from time to time. Therefore, it is possible to cope with a case where a desired air volume can be obtained only by driving the main fan without driving the auxiliary fan.

According to this configuration, in the refrigeration apparatus including the main fan and the auxiliary fan, it is possible to suppress an increase in power consumption when a desired air volume is obtained.

According to the control device of the second aspect of the present invention, in the control device of the first aspect, there is an upper limit in the start driving corresponding value.

Here, when the desired air volume is large, the power consumption tends to be smaller when the main fan and the auxiliary fan are interlocked to obtain the desired air volume than by driving the main fan only to obtain the desired air volume.

In the control device according to the second aspect of the present invention, the start driving corresponding value is set with an upper limit. Since the air volume of the main fan increases as the rotation number instruction value increases, when the desired air volume is large, the rotation number instruction value designated for the main fan also increases. In this control device, even if the desired air volume is large, the auxiliary fan starts to be driven because the upper limit is set in the rotation number instruction value determined as the corresponding value to start driving. Therefore, it is difficult to occur a situation in which the auxiliary fan is not used despite the large desired air volume.

According to this configuration, when a desired air volume is obtained, it is possible to suppress an increase in power consumption due to not using the auxiliary fan.

According to the control device of the third aspect of the present invention, in the control device of the first or second aspect, there is a lower limit in the start driving corresponding value.

Here, if the desired air volume is small, and the rotation speed instruction value determined to start driving is small, the auxiliary fan may also be driven even though only the main fan can obtain the desired air volume. In this case, when the main fan and the auxiliary fan are interlocked and a desired air volume is obtained, power consumption may increase compared to driving only the main fan to obtain the desired air volume.

In the control device according to the third aspect of the present invention, a lower limit is set in the start driving corresponding value. The smaller the rotational speed instruction value for the main fan, the smaller the air volume of the main fan, and the smaller the desired air flow rate is. In this control device, since the lower limit is set in the rotation number instruction value determined as the start-drive corresponding value, the auxiliary fan is not driven even if the desired air volume is small due to the corrected start-drive corresponding value. Therefore, it is difficult to drive the auxiliary fan even though the desired air volume can be obtained only by the main fan.

According to this configuration, when a desired air volume is obtained, an increase in power consumption due to use of the auxiliary fan can be suppressed.

According to the control device of the fourth aspect of the present invention, in the control device of any one of the first to third aspects of the present invention, when the driving or stopping of the auxiliary fan is repeated a predetermined number of times within the first predetermined time, the response to increase the start of driving is performed. value correction.

Here, when the driving or stopping of the auxiliary fan is repeated in a short time interval, the air volume of the auxiliary fan can be considered to be excessive in terms of the air volume balance between the main fan and the auxiliary fan required to satisfy the desired air volume.

In the control device according to the fourth aspect of the present invention, when the driving or stopping of the auxiliary fan is repeated a predetermined number of times within the first predetermined time, the correction for increasing the start driving corresponding value is performed. By performing this correction, the rotation number instruction value of the main fan at the time of starting to drive the auxiliary fan is changed to a rotation number instruction value larger than the rotation number instruction value before the correction. As a result, even if the main fan is driven according to the rotation speed instruction value before the correction of the corresponding value for the start of driving, the auxiliary fan does not start driving. Therefore, it is difficult to start driving the auxiliary fan when the air volume of the auxiliary fan becomes excessive in terms of the air volume balance between the main fan and the auxiliary fan required to satisfy the desired air volume.

According to this configuration, it is possible to reduce the possibility of starting to drive the auxiliary fan when the air volume of the auxiliary fan is not required.

According to the control device of the fifth aspect of the present invention, in the control device of any one of the first to fourth aspects of the present invention, the main fan is driven for more than the second predetermined time based on the rotation number instruction value lower than the predetermined rotation number instruction value When , the correction is performed to reduce the corresponding value of the drive start.

Here, when the desired air volume is not small, the power consumption when the main fan and the auxiliary fan are interlocked to obtain the desired air volume is smaller than the power consumption when only the main fan obtains the desired air volume.

In the control device according to the fifth aspect of the present invention, when the main fan is driven for more than the second predetermined time according to the rotation number instruction value lower than the predetermined rotation number instruction value, the correction for lowering the driving start corresponding value is performed. By performing this correction, the rotation number instruction value corresponding to the main fan when the auxiliary fan starts to be driven is changed to a rotation number instruction value smaller than the rotation number instruction value before the correction. As a result, when the main fan is driven according to the rotation speed instruction value before the correction of the corresponding value for the start of driving, the driving of the auxiliary fan is started. Therefore, if the desired air volume is not small, since the auxiliary fan starts to be driven, the situation that the auxiliary fan is not used will not occur.

According to this configuration, when a desired air volume is obtained, it is possible to suppress an increase in power consumption due to not using the auxiliary fan.

According to the control device of the sixth aspect of the present invention, in the control device of any one of the first to fifth aspects of the present invention, when the main fan starts to be driven, the rotation number instruction to the main fan is determined based on the outdoor air temperature value. value to control the drive or stop of the auxiliary fan.

Here, there is a certain relationship between the air conditioning load and the outdoor air temperature. Therefore, by determining the air volume to be supplied to the heat source side heat exchanger based on the outdoor air temperature, the air volume suitable for the air conditioning load, that is, the desired air volume can be easily adjusted.

In the control device according to the sixth aspect of the present invention, the drive or stop of the auxiliary fan is controlled based on the rotation number instruction value for the main fan determined based on the outdoor air temperature value. Therefore, the drive or stop of the auxiliary fan can be determined indirectly based on the temperature value of the outdoor air.

According to this configuration, it is easy to adjust the air volume to the air volume suitable for the air-conditioning load.

According to the control device of the seventh aspect of the present invention, in the control device of any one of the first to sixth aspects of the present invention, the plurality of rotational speed indication values further include a stop-drive response predetermined to stop the drive of the auxiliary fan The value corresponding to the stop driving is different from the corresponding value of the start driving. In this control device, since the rotation number instruction value determined in advance as a value corresponding to the start of driving is different from the rotation number instruction value determined in advance as a value corresponding to the stop of driving, it is possible to suppress the occurrence of wobble due to driving or stopping of the auxiliary fan.

Invention effect

According to the control device of the first aspect of the present invention, in the refrigeration device including the main fan and the auxiliary fan, it is possible to suppress an increase in power consumption when a desired air volume is obtained.

In the control device according to the second aspect of the present invention, it is possible to suppress an increase in power consumption due to not using an auxiliary fan when a desired air volume is obtained.

In the control device according to the third aspect of the present invention, it is possible to suppress an increase in power consumption due to use of the auxiliary fan when a desired air volume is obtained.

According to the control device of the fourth aspect of the present invention, when a desired air volume is obtained, the possibility of starting to drive the auxiliary fan can be reduced even though the air volume of the auxiliary fan is not required.

In the control device according to the fifth aspect of the present invention, it is possible to suppress an increase in power consumption due to not using an auxiliary fan when a desired air volume is obtained. .

In the control device according to the sixth aspect of the present invention, the air volume can be easily adjusted to suit the air conditioning load air volume.

In the control device according to the seventh aspect of the present invention, it is possible to suppress the occurrence of sway due to the drive or stop of the auxiliary fan.

Description of drawings

1 is a schematic diagram of a heat source device;

2 is a control module diagram of a control device included in the air-conditioning device;

3 is a graph showing the relationship between the fan drive of the outdoor fan and the air volume/static pressure of the outdoor fan;

4 is a graph showing the relationship between the fan drive of the outdoor fan and the air volume/static pressure of the outdoor fan and the booster fan;

(Symbol Description)

20 Outdoor unit (heat source unit)

25 Outdoor fan (main fan)

32 booster fan (auxiliary fan)

60 Controls

Detailed ways

Hereinafter, the control device 60 according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the embodiments of the control device 60 of the present invention are not limited to the embodiments described below, and various modifications can be made without departing from the technical idea of the present invention.

(1) Configuration of Control Device 60

FIG. 1 is a side view of the heat source device 10 . FIG. 2 is a control block diagram of the control device 60 included in the air-conditioning apparatus. The control device 60 according to an embodiment of the present invention is a control device 60 for controlling a cooling device including a heat source unit and an auxiliary fan attached to the heat source unit. The refrigerating apparatus is an air-conditioning apparatus for supplying cooling and heating to the interior of a building such as a building, for example, by performing a vapor-compression refrigeration cycle operation. The air conditioner is formed by connecting the heat source device 10 and an indoor unit (not shown) installed in a room of a building such as a building as a utilization unit through a connecting pipe (not shown). The control device 60 is composed of the heat source side control unit 62 of the heat source device 10, the use side control unit 61 of the indoor unit, and the transmission line connecting the heat source side control unit 62 and the use side control unit 61, and controls the entire air-conditioning apparatus. run.

Hereinafter, the heat source device 10 will be described first.

(2) Structure of Heat Source Device 10

The heat source device 10 includes an outdoor unit 20 as a heat source unit, a pipe member 40 , a fan unit 30 having a booster fan 32 as an auxiliary fan, and a heat source side control unit 62 .

(2-1) Outdoor unit 20

The outdoor unit 20 of the present embodiment is installed in a building. The outdoor unit 20 includes a casing 21, a compressor 22, a four-way switching valve 23, an expansion valve 24 serving as an expansion mechanism, an outdoor heat exchanger (not shown) serving as a heat source side heat exchanger, and an outdoor serving as a main fan Fan 25. Furthermore, the compressor 22 , the four-way switching valve 23 , the expansion valve 24 , the outdoor heat exchanger, and the outdoor fan 25 are arranged in the casing 21 .

The casing 21 has, for example, a rectangular parallelepiped shape, and a suction port 21 a for sucking outdoor air into the casing 21 is provided on the side surface thereof. The suction port 21a is arranged to face, for example, a ventilation port for communicating the outside and the inside of a building so as to take in outdoor air. Moreover, the upper surface of the casing 21 is provided with the installation part 21c for attaching the fan unit 30. As shown in FIG. The installation part 21c is provided with the blower outlet 21b which opens upward.

Further, an electrical component box 26 is accommodated in the housing 21 . Furthermore, the heat source side control unit 62 is arranged in the electrical component box 26 .

The compressor 22 is a compressor whose operation capacity can be changed, and compresses the refrigerant flowing in the refrigerant circuit. The four-way switching valve 23 is a valve for switching the flow direction of the refrigerant. During cooling operation, the refrigerant circuit is switched so that the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator. The flow direction of the internal refrigerant. During the heating operation, the four-way switching valve 23 switches the flow direction of the refrigerant in the refrigerant circuit so that the indoor heat exchanger functions as a condenser and the outdoor heat exchanger functions as an evaporator. The outdoor heat exchanger functions as a condenser during cooling operation and functions as an evaporator during heating operation by exchanging heat with the air sent by the outdoor fan 25 . The expansion valve 24 is an electric expansion valve connected to the liquid side of the outdoor heat exchanger in order to adjust the pressure, flow rate, etc. of the refrigerant flowing in the refrigerant circuit.

The outdoor fan 25 is a fan that can send outdoor air to the outdoor heat exchanger by rotating. More specifically, the outdoor fan 25 sucks outdoor air into the casing 21 from the suction port 21a, exchanges heat with the refrigerant in the outdoor heat exchanger, and blows the heat-exchanged air toward the casing 21 from the outlet 21b. outside. Also, the outdoor fan 25 is a fan controlled by an inverter capable of changing the amount of air supplied to the outdoor heat exchanger, and a propeller fan is used in this embodiment.

The outdoor fan 25 mainly includes an outdoor fan motor 25m, a hub 25a attached to a rotating shaft of the outdoor fan motor 25m, and a plurality of blades 25b arranged on the outer periphery of the hub 25a. The outdoor fan motor 25m is connected to the outdoor fan motor drive unit 64 having the heat source side control unit 62 . The outdoor fan motor drive unit 64 drives the outdoor fan motor 25m or stops the driving of the outdoor fan motor 25m by supplying or cutting off electric power. Then, the outdoor fan motor drive unit 64 supplies electric power to drive the outdoor fan motor 25m at the specified rotational speed based on the specified rotational speed control signal received from the fan control unit 63 including the heat source side control unit 62 . The outdoor fan motor drive unit 64, upon receiving a signal from the fan control unit 63 to stop driving the outdoor fan, stops supplying electric power to the outdoor fan motor 25m.

(2-2) Tube member 40

The pipe member 40 is a duct that guides the air blown out from the outdoor unit 20 to the outside. As the pipe member 40 , members of different lengths and shapes are used depending on the installation environment of the outdoor unit 20 and the like.

An exhaust port 41 is provided on one end side of the pipe member 40 . In the pipe member 40, the exhaust port 41 is an air outlet blown out from the outdoor unit 20 side. Also, the exhaust port 41 of the pipe member 40 is provided so as to be opposed to the ventilation louver 80 . In addition, a damper (not shown in the figure) that can open and close the exhaust port 41 is provided near the exhaust port 41, and can be configured as follows, that is, when the operation of the air conditioner is stopped, the exhaust air that communicates with the outside is closed. mouth 41.

An intake port 42 is provided on the other end side of the pipe member 40 . In the pipe member 40, the intake port 42 is an air inlet blown out from the outdoor unit 20 side. Furthermore, the duct member 40 is connected to the fan unit 30 so that the air blown out from the outdoor unit 20 side flows into the intake port 42 .

(2-3) Fan unit 30

The fan unit 30 is additionally provided between the outdoor unit 20 and the duct member 40 in order to supplement the insufficient air volume of the outdoor fan 25 due to the pressure loss in the duct member 40 . The fan unit 30 includes a fan casing 31 and a booster fan 32 .

The fan case 31 has, for example, a rectangular parallelepiped shape, and accommodates the booster fan 31 therein. The upper surface side communication opening 31 a is formed on the upper surface of the fan case 31 . The pipe member 40 is fixed to the upper surface of the fan case 31 so that the intake port 42 and the upper surface side communication opening 31a face each other. On the lower surface of the fan case 31, a lower surface communication opening 31b is formed. The lower surface of the fan case 31 is fixed to the installation portion 21c of the casing 21 so that the lower surface side communication opening 31b and the air outlet 21b face each other.

The supercharging fan 32 has a role of assisting the outdoor fan 25 by rotating. In addition, the supercharging fan 32 is a fan with a fixed number of revolutions, that is, a so-called constant-speed fan, and a propeller fan is used in this embodiment.

The supercharging fan 32 mainly includes a supercharging fan motor 32m, a hub 32a attached to a rotating shaft of the supercharging fan motor 32m, and a plurality of blades 32b arranged on the outer periphery of the hub 32a. The booster fan motor 32m is connected to the booster fan motor drive unit 65 . The booster fan motor drive unit 65 is arranged in an electrical component box (not shown) arranged in the fan case 31 . A fan motor drive part 65 is added, and the supercharging fan motor 32m is driven by supplying or cutting off the electric power, or the supercharging fan motor 32m is stopped from driving. Furthermore, when the fan unit 30 is attached to the outdoor unit 20, the supercharging fan motor drive part 65 of the present embodiment is connected to the heat source side control part 62. Also, the booster fan motor drive unit 65 receives a drive or stop signal from the fan control unit 63 having the heat source side control unit 62, and supplies power to drive the booster fan motor 32m, or stops supplying power to the booster fan motor 32m .

According to this configuration, when the outdoor fan motor 25m is driven as an air flow in the heat source device 10, the outside air is sucked into the casing 21 from the suction port 21a through the vent through the rotation of the blades 25b. The sucked outdoor air is blown out from the outlet 21b after heat exchange is performed by the outdoor heat exchanger. At this time, the booster fan motor 32m is driven, and by the rotation of the blades 32b, the air discharged from the air outlet 21b is sucked into the fan casing 31, passes through the duct member 40, and passes from the exhaust port 41 of the duct member 40 to the ventilation louver 80. Outdoor discharge. Of course, even if the booster fan motor 32m is not driven, by driving the outdoor fan motor 25m, after being sucked in from the suction port 21a and supplied to the outdoor heat exchanger, the outdoor air blown out from the blower outlet 21b passes through the duct member 40 from the duct member 40 The exhaust port 41 is exhausted to the outside through the ventilation shutter 80 .

In addition, although the booster fan motor drive unit 65 of the present embodiment receives a drive or stop signal from the fan control unit 63 having the heat source side control unit 62 and supplies/stops power supply to the booster fan motor 32m, it is not limited to this. The fan unit 30 may independently include a control unit that generates a drive or stop signal of the supercharger fan motor drive unit 65 . Furthermore, in this embodiment, the outdoor unit 20 and the fan unit 30 have different power sources, respectively. Of course, it is not limited to this configuration, and a single power source may be branched from the outdoor unit 20 and supplied to the fan unit 30 .

(2-4) Heat source side control unit 62

The heat source side control unit 62 is arranged inside the electric component box 26 of the outdoor unit 20 . The heat source side control unit 62 includes a CPU, a memory, and the like, and controls operations of various devices included in the heat source device 10 .

(3) Specific Configuration of Heat Source Side Control Unit 62

Hereinafter, the heat source side control unit 62 will be described in detail with reference to the drawings. The heat source side control unit 62 is connected to the compressor 22, the four-way switching valve 23, the expansion valve 24, the outdoor fan motor 25m, the booster fan motor drive unit 65, and various sensors. Various sensors include an outdoor air temperature sensor 90 , a suction pressure sensor 92 , and a discharge pressure sensor 91 . The outdoor air temperature sensor 90 is a sensor required to detect the temperature of the outdoor air around the outdoor unit 20, and is provided in the vicinity of the suction port 21a. The suction pressure sensor 92 is a sensor required to detect the suction pressure of the compressor 22 , and is provided between the four-way switching valve 23 and the suction side of the compressor 22 in the refrigerant circuit. The discharge pressure sensor 91 is a sensor required to detect the discharge pressure of the compressor 22 , and is provided between the four-way switching valve 23 and the discharge side of the compressor 22 in the refrigerant circuit. Furthermore, the heat source side control unit 62 includes a fan control unit 63 .

The fan control unit 63 controls the operations of the outdoor fan 25 and the booster fan 32 . Specifically, the fan control unit 63 transmits a specified rotation speed control signal to the outdoor fan motor drive section 64 to drive the outdoor fan 25, wherein the specified rotation speed control signal is a signal for driving the outdoor fan 25m at a specified rotation speed . Then, the fan control unit 63 transmits a signal to stop driving the outdoor fan 25 to the outdoor fan motor drive unit 64 to stop driving the outdoor fan 25 . In addition, the fan control unit 63 transmits a drive or stop signal of the booster fan 32 to the booster fan motor drive unit 65 , that is, a signal to start driving the booster fan and a signal to stop driving the booster fan, so that the booster fan 32 drive, or stop the booster fan 32 from driving.

In addition, when each signal sent to the outdoor fan motor drive unit 64 and/or the booster fan motor drive unit 65 is the same as the signal sent last time, the signal may not be sent from the fan control unit 63 to the outdoor fan motor drive unit. 64 and/or booster fan motor drive unit 65 . Further, the fan control unit 63 includes an acquisition unit 63a, a storage unit 63b, a determination unit 63c, and a signal generation unit 63d.

(3-1) Acquisition section 63a

When the user inputs a stop operation command via a remote controller (not shown) or the like, the acquisition unit 63a sends the stop operation command to the signal generation unit 63d. Then, when the user inputs an operation introduction command via the remote controller, the acquiring unit 63a acquires the current outdoor air temperature detected by the outdoor air sensor 90, and sends the operation introduction command and the acquired outdoor air temperature as the temperature value of the outdoor air. Go to the judgment section 63c.

The acquisition unit 63a acquires the suction pressure detected by the suction pressure sensor 92 and the discharge pressure detected by the discharge pressure sensor 91 at predetermined time intervals, and sends the acquired suction pressure and discharge pressure to the determination unit 63c.

(3-2) Memory unit 63b

FIG. 3 is a graph showing the relationship between the fan drive degree of the outdoor fan 25 and the air volume/static pressure of the outdoor fan 25 . FIG. 4 is a graph showing the relationship between the fan drive degree of the outdoor fan 25 and the air volume/static pressure of the outdoor fan 25 and the supercharging fan 32 .

The memory unit 63b stores a revolution table (not shown) in advance. The number of revolutions table indicates the number of revolutions of the outdoor fan motor 25 prescribed for each of the plurality of fan driving degrees of the outdoor fan 25 . The determination unit 63c specifies the fan drive degree by referring to the revolution table stored in the memory unit 63b. In addition, the fan drive degree of the present embodiment ranges from 0 to 11, and is set stepwise so that "0" is the stop, "1" is the minimum rotation number, and "11" is the maximum rotation number.

Then, the memory unit 63b stores in advance one of the fan drive degrees of the plurality of fan drive degrees with respect to the outdoor fan 25 as a drive start corresponding value for starting the drive of the booster fan 32 . In addition, the storage unit 63b uses a fan drive degree other than the fan drive degree stored in advance as the start drive corresponding value among the plurality of fan drive degrees for the outdoor fan 25 as a stop drive for stopping the booster fan 32 from driving. The corresponding value is stored in advance. In addition, in the present embodiment, the fan drive degree "6" is determined in advance as the start driving corresponding value, and the fan driving degree "3" is predetermined as the stop driving corresponding value.

Furthermore, the storage unit 63b stores the fan drive degree of the outdoor fan 25 designated by the determination unit 63c. When the driving start corresponding value is corrected by the determination unit 63c, the memory unit 63b also stores the latest corrected driving start corresponding value.

(3-3) Judging part 63c

When the determination unit 63c receives the operation introduction command and the temperature value of the outdoor air from the acquisition unit 63a, it determines the fan drive degree when the outdoor fan 25 starts to be driven based on the temperature value of the outdoor air received from the acquisition unit 63a, and specifies Determined fan drive. In addition, the determination part 63c of this Example designates the fan drive degree at the time of starting to drive the outdoor fan 25 based on the temperature value of an outdoor air and an operation state. Specifically, when the outdoor air temperature exceeds 20 degrees and an operation introduction command for cooling operation is input, the determination unit 63c determines the fan drive degree as "6" and designates it. On the other hand, when the outdoor air temperature is lower than 20 degrees and the operation introduction command of the cooling operation is input, the determination unit 63c determines the fan drive degree as "1" and designates it. Then, when the outdoor air temperature is lower than 20 degrees and the operation introduction command for the heating operation is input, the determination unit 63c determines the fan drive degree as "11" and designates it. On the other hand, when the outdoor air temperature exceeds 20 degrees and the operation introduction command of the heating operation is input, the determination unit 63c determines the fan drive degree as "1" and designates it.

Then, the determination unit 63c determines the fan drive degree of the outdoor fan 25 after the start of driving based on the operation load, and designates the determined fan drive degree. In the present embodiment, the determination unit 63c determines the fan drive degree of the outdoor fan 25 after the start of driving based on the refrigerant pressure of the compressor 22, and designates the determined fan drive degree. Specifically, the determination part 63c determines and designates the fan drive degree of the outdoor fan 25 so that the suction pressure and the discharge pressure sent from the acquisition part 63a may reach desired target values, respectively. In addition, in the present embodiment, the fan drive degree determined by the determination unit 63c makes the suction pressure and the discharge pressure sent from the acquisition unit 63a reach desired target values, respectively. However, the fan drive degree determined by the determination unit 63c may be such that the pressure difference between the suction pressure and the discharge pressure sent from the acquisition unit 63a reaches a desired target pressure difference.

In addition, the determination part 63c determines whether it is necessary to drive the supercharging fan 32 based on the value corresponding to the start of drive. That is, the determination part 63c determines the drive or stop of the supercharging fan 32 based on the corresponding value of the start of drive stored in the memory part 63b and the fan drive degree of the designated outdoor fan 25.

Specifically, when the determination unit 63c receives the operation introduction command from the acquisition unit 63a, the storage unit 63b compares the pre-stored value corresponding to the start of driving with the fan drive degree of the designated outdoor fan 25. Then, when the fan drive degree of the designated outdoor fan 25 is larger than the drive degree of the fan drive degree (“6” in the present embodiment) determined in advance as the starting drive corresponding value, the determination unit 63 c determines that it is necessary to drive the supercharger fan 32. That is, in the present embodiment, when "6" or "11" is designated as the fan drive degree of the outdoor fan 25 at the time of starting the drive, the determination unit 63c determines that the booster fan 32 needs to be driven. On the other hand, when the fan drive degree of the designated outdoor fan 25 is smaller than the drive degree of the fan drive degree (“6” in the present embodiment) determined in advance as the starting drive corresponding value, the determination unit 63 c determines that the drive increase is unnecessary. pressure fan 32. That is, in the present embodiment, when "1" is designated as the fan drive degree of the outdoor fan 25 at the start of driving, the determination unit 63c determines that the booster fan 32 does not need to be driven.

When the air-conditioning apparatus starts to operate, the determination unit 63c determines whether or not it is necessary to drive the supercharger fan 32, and then continuously determines whether or not it is necessary to drive the supercharger fan 32 during the operation of the air-conditioning apparatus.

For example, when the air-conditioning apparatus is in operation and the supercharging fan 32 is driven, the determination unit 63c compares the value corresponding to the stop driving stored in the memory unit 63b in advance with the fan drive degree of the designated outdoor fan 25 . Then, when the fan drive degree of the designated outdoor fan 25 is greater than the fan drive degree determined in advance as a stop driving corresponding value (“3” in this embodiment), the determination unit 63 c determines that the booster fan 32 needs to be driven. That is, in the present embodiment, when any one of the fan drive degrees between "4" and "11" is designated as the fan drive degree of the outdoor fan 25, the determination unit 63c determines that the booster fan 32 needs to be driven. On the other hand, when the fan drive degree of the designated outdoor fan 25 is smaller than the fan drive degree determined in advance as the stop driving corresponding value (“3” in this embodiment), the determination unit 63 c determines that the booster fan 32 does not need to be driven . That is, in the present embodiment, when any one of the fan drive degrees between "0" and "3" is designated as the fan drive degree of the outdoor fan 25, the determination unit 63c determines that the booster fan 32 does not need to be driven.

Then, for example, when the air-conditioning apparatus is operating and the booster fan 32 is not driven, the determination unit 63c compares the drive start corresponding value stored in the storage unit 63b with the fan drive degree of the designated outdoor fan 25 . The determination unit 63c determines that it is necessary to drive the booster fan 32 when the fan drive degree of the designated outdoor fan 25 is greater than the fan drive degree stored in the memory unit 63b and determined as a start driving corresponding value. On the other hand, when the fan drive degree of the designated outdoor fan 25 is smaller than the fan drive degree stored in the memory unit 63b and determined as the start driving corresponding value, the determination unit 63c determines that the booster fan 32 does not need to be driven.

In addition, the determination part 63c corrects the determined value corresponding to the start of drive according to the drive or stop state of the supercharger fan 32. FIG. More specifically, when the driving or stopping of the booster fan 32 is repeated a predetermined number of times within the first predetermined time, the determination unit 63c corrects the value corresponding to the start of driving. In the present embodiment, when the fan drive degrees "6" and "3" of the outdoor fan 25 are designated as a predetermined number of times (for example, once) to alternate within a first predetermined time (for example, 10 minutes), the determination unit 63c performs a Increase the correction of the corresponding value of the start drive. More specifically, in the present embodiment, when the fan drive degree of the outdoor fan 25 within the first predetermined time is designated in the order of "6", "3", and "6", the determination unit 63c performs correction to increase the corresponding value for the start of drive . In addition, when the correction for increasing the start driving corresponding value is performed, the fan driving degree determined as the driving start corresponding value may be increased one by one driving degree. That is, when the current starting drive corresponding value is determined to be the fan drive degree "6", the correction may be performed so that the starting drive corresponding value is changed from the current fan drive degree "6" to the fan drive degree "7". ". In addition, an upper limit may be set for the fan drive degree determined as the starting drive corresponding value. In the present embodiment, when the correction to increase the starting drive corresponding value is performed, the fan drive degree is determined to be within the range of "8" or less as the start drive the corresponding value.

Then, when the outdoor fan 25 is driven for more than the second predetermined time in a state where the degree of driving of the outdoor fan is lower than the predetermined fan driving degree, the determination unit 63c corrects the corresponding value to start driving. In the present embodiment, when the second predetermined time (for example, 20 minutes) is exceeded and the fan drive degree of the outdoor fan 25 is less than the fan drive degree of "6" during the operation of the air-conditioning apparatus, the determination unit 63c determines Correction is performed to lower the corresponding value of the start drive. Furthermore, when the driving start corresponding value is lowered, the fan driving degree designated as the driving start corresponding value may be lowered one by one driving degree. That is, when the current starting drive corresponding value is determined as the fan drive degree "7", the correction may be performed so that the current fan drive corresponding value is changed from the current fan drive degree "7" to the fan drive degree "6". ".

In addition, a lower limit may be set for the fan drive degree determined as the value corresponding to the start of driving. In this embodiment, when the correction to lower the value corresponding to the start of drive is performed, the fan drive degree is determined as the start within the range greater than "6". drive the corresponding value.

When the correction is performed, the determination unit 63c determines whether it is necessary to drive the supercharging fan 32 based on the corrected value corresponding to the start of driving. Specifically, the determination unit 63c compares the corrected start driving corresponding value stored in the storage unit 63b with the fan drive degree of the designated outdoor fan 25 . Then, the determination unit 63 c determines that the booster fan 32 needs to be driven when the fan drive degree of the designated outdoor fan 25 is greater than the fan drive degree determined as the corrected start driving corresponding value. In addition, when driving the supercharging fan 32, even when the start driving corresponding value is corrected, it is determined that the supercharging needs to be driven until a fan driving degree lower than the fan driving degree determined as the stop driving corresponding value is designated. fan 32.

In addition, in the determination part 63c, the determination as to whether it is necessary to drive the supercharging fan 32 is performed, for example, every predetermined time. Furthermore, when the outdoor fan 25 and the booster fan 32 are stopped while the defrosting operation is being performed, the driving of the booster fan 32 during the defrosting operation may be stopped, and the correction to increase the corresponding value of the start of driving may not be performed. calculated.

(3-4) Signal generation unit 63d

The signal generation unit 63 d generates a control signal and outputs it to the fan control unit 63 upon receiving the judgment result from the judgment unit 63 c or the command from the acquisition unit 63 a. Specifically, the signal generation unit 63d generates a signal to stop driving the outdoor fan and a signal to stop driving the supercharger fan when receiving a stop operation command from the acquisition unit 63a, and outputs the generated signals to the fan control unit 63. Then, upon receiving the determination result from the determination unit 63c, the signal generation unit 63d generates a designated rotation speed control signal so that the rotational speed of the outdoor fan motor 25m becomes the fan drive degree designated by the determination unit 63d, and sends it to the fan control unit 63. The resulting signal is output.

The signal generating unit 63d generates a signal for starting the driving of the booster fan upon receiving the determination result that the booster fan 32 needs to be driven from the determining unit 63c, and outputs the generated signal to the fan control unit 63. Then, the signal generating unit 63 d generates a signal for stopping driving of the booster fan upon receiving the determination result that the supercharging fan 32 does not need to be driven from the determining unit 63 c, and outputs the generated signal to the fan control unit 63 .

(4) Features

(4-1)

As the main fan, a fan that can change the number of revolutions is used, and as the auxiliary fan, a constant-speed fan that is cheaper than a fan with a variable number of revolutions is used. The adjustment range of the air volume/static pressure is limited, and it may not be possible to adjust the air volume below a predetermined air volume. For example, if the outdoor fan 25 and the booster fan 32 are linked in this embodiment, even if the fan drive of the outdoor fan 25 is reduced from "6" to "3" as shown in FIG. The static pressure of the booster fan 32, when the fan driving degree of the outdoor fan 25 is in the range of "3" to "6", the total air volume generated by the outdoor fan 25 and the booster fan 32 will be the fan driving degree "6" ” is the sum of the air volume of the outdoor fan 25 and the air volume of the booster fan 32. As described above, once the air volume cannot be adjusted, especially in the case of low-load operation, it may not be possible to cope with the air volume suitable for the air-conditioning load.

However, during low-load operation, etc., the desired air volume is small, and the desired air volume can be obtained by driving only the main fan. However, once the driving start corresponding value is fixed to a predetermined fan drive degree, the main fan is driven depending on the air volume. Auxiliary fans sometimes increase power consumption as a whole.

Therefore, in the present embodiment, the predetermined value corresponding to the start of driving is corrected according to the driving or stopping state of the supercharging fan 32 . By performing this correction, the fan drive degree of the outdoor fan 25 is changed when the booster fan 32 is started to be driven, and therefore, the air volume of the outdoor fan 25 is changed when the booster fan 32 is started to be driven. Therefore, it can be adapted to a case where a desired air volume can be obtained only by driving the outdoor fan 25 without driving the supercharging fan 32 .

According to this configuration, in the refrigeration apparatus including the outdoor fan 25 and the supercharging fan 32, it is possible to suppress an increase in power consumption when a desired air volume is obtained.

Furthermore, by using the supercharging fan 32, the amount of air supplied to the outdoor heat exchanger can be increased, so that the performance can be improved, and the usable temperature range can be expanded. Also, the fan unit 30 can be used as a kit necessary for improving the performance of the heat source device 10 .

(4-2)

Here, when the desired air volume is large, the power consumption tends to be smaller when the outdoor fan 25 and the booster fan 32 are interlocked to obtain the desired air volume than by driving only the outdoor fan 25 to obtain the desired air volume.

In this embodiment, since the greater the fan drive degree is, the higher the rotation speed of the outdoor fan motor 25m is, the greater the air volume generated by the outdoor fan 25 is. Therefore, when the desired air volume is large, the designated fan drive degree increases. In addition, an upper limit is set to the determined start-driving corresponding value. Therefore, even if the corresponding value of the start of driving is corrected, the supercharging fan 32 is started to be driven when the desired air volume is large. Therefore, it is difficult to occur a situation in which the booster fan 32 is not used despite a large desired air volume.

According to this configuration, when a desired air volume is obtained, it is possible to suppress an increase in power consumption due to not using the supercharging fan 32 .

(4-3)

Here, when the desired air volume is small, the fan drive degree determined to start driving the corresponding value is small, and the booster fan 32 may also be driven even though the desired air volume can be obtained only by the outdoor fan 25 . At this time, when the outdoor fan 25 and the booster fan 32 are driven to obtain a desired air volume, the power consumption may become larger than when only the outdoor fan 25 is driven to obtain a desired air volume.

In this embodiment, since the fan driving degree is smaller, the rotation speed of the motor 25m of the outdoor fan is lower, and the air volume generated by the outdoor fan 25 is smaller. Therefore, when the desired air volume is small, the designated fan drive degree is small. In addition, a lower limit is set to the fan drive degree determined as the value corresponding to the start of drive. Therefore, even if the corresponding value of the start of driving is corrected, the supercharging fan 32 is not started to be driven when the desired air volume is small. Therefore, it is difficult to cause a situation in which the booster fan 32 is driven even though the desired air volume can be obtained only by the outdoor fan 25 .

According to this configuration, when a desired air volume is obtained, it is possible to suppress an increase in power consumption due to use of the supercharging fan 32 .

(4-4)

However, when the driving or stopping of the booster fan 32 is repeated in a short time interval, it is considered that the air volume of the booster fan 32 is excessive from the viewpoint of the balance between the air volumes of the outdoor fan 25 and the booster fan 32 at the desired air volume.

In the present embodiment, when the driving or stopping of the supercharging fan 32 is repeated a predetermined number of times within the first predetermined time, correction is performed to increase the corresponding value for the start of driving. By performing this correction, the fan drive degree of the outdoor fan 25 when driving of the booster fan 32 is started becomes a greater drive degree than the fan drive degree before the correction. As a result, even if the outdoor fan 25 is driven at the fan driving degree before the correction of the start driving corresponding value, the supercharging fan does not start driving. Therefore, it is difficult to start driving the supercharger fan 32 when the air volume of the supercharger fan 32 becomes excessive in the air volume balance between the outdoor fan 25 and the supercharger fan 32, which is a desired air volume.

According to this configuration, it is possible to reduce the possibility of starting to drive the supercharging fan 32 even though the air volume of the supercharging fan 32 is not required.

(4-5)

If the desired air volume is too small, the power consumption for obtaining the desired air volume by interlocking the outdoor fan 25 with the booster fan 32 may become smaller than driving only the outdoor fan 25 to obtain the desired air volume.

In the present embodiment, when the outdoor fan 25 is driven at a fan driving degree lower than the fan driving degree "6" for more than the second predetermined time period, correction is performed to lower the corresponding value for starting driving. By performing this correction, the fan drive degree of the outdoor fan 25 becomes smaller than the fan drive degree before the correction when the booster fan 32 starts to be driven. As a result, when the outdoor fan 25 is driven at the fan drive degree before the correction of the drive start corresponding value, the booster fan 32 starts to be driven. Therefore, when the desired air volume is too small, since the booster fan 32 starts to be driven, the situation where the booster fan 32 is not used is unlikely to occur.

According to this configuration, it is possible to suppress an increase in power consumption due to not using the booster fan 32 when a desired air volume is obtained.

(4-6)

Here, there is a certain relationship between the air conditioning load and the temperature of the outdoor air. Therefore, by determining the air volume to be supplied to the outdoor heat exchanger according to the temperature of the outdoor air, the air volume suitable for the air conditioning load, that is, the desired air volume can be easily adjusted.

In the present embodiment, when driving of the outdoor fan 25 is started, that is, when the operation of the air-conditioning apparatus is started, the fan driving degree of the outdoor fan 25 is specified according to the temperature value of the outdoor air. Then, the drive or stop of the booster fan 32 is controlled based on the start-drive corresponding value stored in the memory unit 63b in advance and the designated fan drive degree of the outdoor fan 25 . Therefore, the drive or stop of the supercharging fan 32 is indirectly determined according to the temperature value of the outdoor air.

According to this configuration, it is easy to adjust the air volume in accordance with the air-conditioning load when the air-conditioning apparatus is started to operate.

(4-7)

In the present embodiment, among the plurality of fan drive degrees of the outdoor fan 25 , a value other than the fan drive degree determined in advance as a value corresponding to stop driving is designated. As described above, since the fan drive degree predetermined as the value corresponding to start driving is different from the fan drive degree predetermined as the value corresponding to stop driving, it is possible to prevent the booster fan 32 from oscillating between driving and stopping.

(5) Variation

(5-1) Variation A

In the above-described embodiment, the fan drive degree at which the outdoor fan 25 starts to be driven is designated according to the temperature and operation of the outdoor air, and the outdoor fan motor 25m is controlled so that the outdoor fan 25 is driven at the designated fan drive degree.

In addition, if the high pressure of the refrigeration cycle is high during the cooling operation or the low pressure of the refrigeration cycle during the heating operation is low, the outdoor fan 25 can be designed to start driving at the specified fan drive degree.

In the above-described embodiment, the drive or stop of the booster fan 32 is controlled based on the drive start designation value stored in the memory 63b and the designated fan drive degree of the outdoor fan 25 . In addition, when the difference between the discharge pressure and the suction pressure exceeds a predetermined pressure value, the supercharging fan 32 may be designed to start driving.

(5-2) Variation B

In addition to the above-mentioned embodiment, it can also be designed so that the corresponding value of stop driving can be corrected.

Industrial Availability

The present invention relates to a control device capable of suppressing an increase in power consumption when a desired air volume is obtained, and can be effectively used in a refrigeration device including a main fan and an auxiliary fan.

Claims (7)

1, control device (60) for a refrigeration device, the refrigeration device comprising a heat source unit (20) and an auxiliary fan (32), the heat source unit (20) having a heat source side heat exchanger and a main fan (25) capable of changing the number of revolutions, the main fan feeding outdoor air to the heat source side heat exchanger, the auxiliary fan (32) being attached to the heat source unit to assist the main fan and having a constant number of revolutions,

the method is characterized in that:

the control device comprises a memory unit (63b) and a correction unit (63c), wherein rotation speed indication values are stored in the memory unit (63b) in advance, and the rotation speed indication values are determined in advance as corresponding values for starting the auxiliary fan;

the correction unit corrects the determined drive start correspondence value according to a driving or stopping state of the sub fan.

2. The control device according to claim 1, characterized in that:

the start drive correspondence value has an upper limit.

3. The control device according to claim 1 or 2, characterized in that:

the start driving correspondence value has a lower limit.

4. The control device according to claim 1, characterized in that:

when the driving or stopping of the sub fan is repeated a predetermined number of times within a 1 st predetermined time, correction is performed to increase the start driving correspondence value.

5. The control device according to claim 1, characterized in that:

when the main fan is driven for more than 2 nd predetermined time within a revolution value lower than a predetermined revolution instruction value, correction is performed to lower the drive start correspondence value.

6. The control device according to claim 1, characterized in that:

when the main fan starts to be driven, the auxiliary fan is controlled to be driven or stopped according to a rotation number instruction value for the main fan, which is determined based on an outdoor air temperature value.

7. The control device according to claim 1, characterized in that:

the plurality of rotation number instruction values include a stop driving correspondence value for stopping driving of the sub fan, which is determined in advance and is different from the start driving correspondence value.

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