JP6324612B2 - Refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a refrigeration cycle apparatus that operates by receiving direct current power supply.

  Conventionally, a refrigeration cycle apparatus such as an air conditioner is operated with a three-phase AC power supplied from a commercial power source or a generator (see, for example, Patent Document 1). In general, electrical components (for example, a compressor motor, a blower motor, or a solenoid valve) constituting the refrigeration cycle apparatus operate using a three-phase AC 200 V, a single-phase AC 200 V, a DC 12 V, or the like as a primary power source. Therefore, in such a refrigeration cycle apparatus, other voltages are generated from three-phase AC200V as a primary power source.

  Moreover, in the refrigerating cycle apparatus etc. which are described in patent document 1, in order to drive motors, such as a compressor and an air blower, a large capacity inverter apparatus is generally used (for example, refer patent document 2). . In such an inverter device, a method is generally used in which three-phase or two-phase alternating current is rectified to generate a DC bus voltage for driving the inverter.

  On the other hand, in data centers equipped with large-capacity ICT (Information and Communication Technology) devices, there is a move to increase the efficiency of the system significantly by replacing the power supply system from AC to high-voltage DC (for example, non- Patent Document 1). In the case of such a configuration, the supplied high direct-current voltage can be used as it is as the direct current for driving the inverter device used in the refrigeration cycle apparatus. Thereby, simplification of the configuration of the refrigeration cycle apparatus and higher efficiency of the refrigeration cycle apparatus can be aimed at.

  A typical electric circuit of an AC input type refrigeration cycle apparatus (hereinafter referred to as an AC refrigeration cycle apparatus 1000) will be described. FIG. 7 is a circuit configuration showing an outline of an electric circuit of the AC refrigeration cycle apparatus 1000. The AC refrigeration cycle apparatus 1000 includes a compressor motor 1002, a DC / AC converter 1003, a smoothing capacitor 1004, a relay 1005, an inrush prevention resistor circuit 1006, a three-phase full-wave rectifier circuit 1007, and a zero cross sensor 1014.

The compressor motor 1002 drives a compressor (not shown).
The DC / AC converter 1003 drives the compressor motor 1002.
The smoothing capacitor 1004 smoothes the current supplied to the DC / AC converter 1003.
The relay 1005 and the inrush prevention resistance circuit 1006 are for suppressing an inrush current flowing into the smoothing capacitor 1004.
The three-phase full-wave rectifier circuit 1007 rectifies alternating current into direct current.
The zero cross sensor 1014 detects the presence of an AC voltage.

The operation of the AC refrigeration cycle apparatus 1000 will be described.
The AC refrigeration cycle apparatus 1000 takes in the voltage supplied from the AC system 1009 through the system impedance 1011 and the AC circuit breaker 1008. System voltage taken into AC refrigeration cycle apparatus 1000 is converted from AC to DC by three-phase full-wave rectifier circuit 1007.

  The voltage converted into direct current by the three-phase full-wave rectifier circuit 1007 is supplied to the smoothing capacitor 1004 through the relay 1005 and the inrush prevention resistor circuit 1006. The DC bus voltage smoothed by the smoothing capacitor 1004 is input to the DC / AC converter 1003. Thus, the compressor motor 1002 is driven. Here, the relay 1005 and the inrush prevention resistance circuit 1006 are provided to suppress an inrush current flowing from the AC system into the smoothing capacitor 1004 when power is supplied from the AC circuit breaker 1008.

  When the AC refrigeration cycle apparatus 1000 is turned on from the AC circuit breaker 1008, the relay 1004 is opened, and the smoothing capacitor 1004 is slowly charged with a low current through the inrush prevention resistor from the system. Thereafter, AC refrigeration cycle apparatus 1000 closes relay 1005 after DC voltage is sufficiently charged in smoothing capacitor 1004, and starts driving of compressor motor 1002 by DC / AC converter 1003.

  In the general AC refrigeration cycle apparatus 1000, the AC circuit breaker 1008 is opened for some reason during operation, and the open state of the AC circuit breaker 1008 is determined in order to prevent an excessive inrush current from flowing during re-entry. Several functions are provided, and the inrush prevention relay 1005 is opened.

  One of them has a function of determining that the AC circuit breaker 1008 is opened when the voltage of the smoothing capacitor 1004 becomes a predetermined value or less. The predetermined value is set to a value smaller than the lower limit value of the allowable system voltage. For example, the DC voltage of -10% down of the AC400V system that needs to be continuously operated is about 509V. By setting the open state determination level to a value lower than that, the AC circuit breaker 1008 is opened. After that, when the voltage of the smoothing capacitor 1004 decreases, the open state of the AC circuit breaker 1008 can be determined.

  As one of them, the presence of the AC voltage input to the AC refrigeration cycle apparatus 1000 is grasped by the zero cross sensor 1014, and when there is no point crossing zero in the AC voltage, there is no AC, that is, the AC circuit breaker 1008. Has a function of determining that is in an open state.

  By using these circuit breaker open state determination functions, even if the AC circuit breaker 1008 is once opened and then closed, the relay 1005 can be opened immediately after the circuit breaker 1008 is opened. Inrush current can be prevented at the time of turning on.

  In the AC refrigeration cycle apparatus 1000, a large charging current flows to the smoothing capacitor 1004 even when an instantaneous voltage drop occurs in the AC system 1009 and then the voltage is restored, but the current is somewhat suppressed by the system impedance 11. It has come to be. Therefore, by devising the design of the smoothing capacitor 1004 and the like, it is possible to avoid the influence on the AC refrigeration cycle apparatus 1000 due to a large charging current.

  Next, a typical electric circuit of a DC input type refrigeration cycle apparatus (hereinafter referred to as a DC refrigeration cycle apparatus 2000) will be described. FIG. 8 is a circuit configuration showing an outline of the electric circuit of the DC refrigeration cycle apparatus 2000. The DC refrigeration cycle apparatus 2000 includes a compressor motor 2002, a DC / AC converter 2003, a smoothing capacitor 2004, a relay 2005, and an inrush prevention resistance circuit 2006. These function similarly to the compressor motor 1002, the DC / AC converter 1003, the smoothing capacitor 1004, the relay 1005, and the inrush prevention resistance circuit 1006 provided in the AC refrigeration cycle apparatus 1000.

  The DC refrigeration cycle apparatus 2000 is supplied with a DC voltage via an AC / DC converter 2013 that converts the voltage of the AC system 2009 to DC and a circuit breaker 2011 that opens and closes the DC. A battery 2012 is installed on the output side of the AC / DC converter 2013. The battery 2012 is installed to stabilize high-voltage direct current.

The operation of the DC refrigeration cycle apparatus 2000 will be described.
In the DC refrigeration cycle apparatus 2000, the voltage supplied from the AC system 2009 is converted into a high-voltage DC (about 380 VDC in the case of an AC 400V system) by the AC / DC converter 2013, and then taken in through the DC circuit breaker 2011. . The DC voltage taken into the DC refrigeration cycle apparatus 2000 is supplied to the smoothing capacitor 2004 through the relay 2005 and the inrush prevention resistance circuit 2006. The DC voltage smoothed by the smoothing capacitor 2004 is input to the DC / AC converter 2003. Thus, the compressor motor 2002 is driven.

  Further, by adopting such a configuration, even when applied to an air conditioning system for a data center, as shown in Non-Patent Document 1, it is equivalent to one DC / AC converter on the uninterruptible power supply side. One AC / DC converter on the load side is unnecessary, and power loss can be reduced.

  Note that the battery 2012 not only stabilizes the DC voltage, but also functions as a backup when the AC system 2009 is not supplied due to a power failure or the like. However, the output voltage of the battery 2012 varies depending on the state of charge (remaining amount), and the minimum output voltage generally decreases to about 70% with respect to the maximum output voltage. Specifically, when the AC system 2009 is an AC 400V system, the high-voltage DC voltage is set to about 380V, but the minimum output voltage of the battery 2012 at that time is about 270V.

JP 2011-89737 A JP 2009-232591 A

http: // www. ntt-f. co. jp / news / heisei23 / h23-1110. html

  However, in the refrigeration cycle apparatus as disclosed in Patent Document 1, the primary power supply has a device configuration assuming a three-phase AC power supply, and a high-voltage DC power supply represented by DC380V can be used as the primary power supply. There was a problem that it was not possible.

  In addition, when a circuit configuration is used in which the primary power supply is fed to an electric motor (for example, a compressor motor or a blower motor) via a contactor, an electric motor that operates with high-voltage direct current is widely used. There were problems such as not. In other words, since refrigeration cycle devices that operate with power supplied from an AC power source are widespread, it is difficult to obtain parts that operate on high voltage DC on the market. Even if parts that operate with high-voltage direct current are available, it is necessary to increase the size of the refrigeration cycle apparatus by using a DC power source drive, and there is a problem in that mounting on the refrigeration cycle apparatus is restricted. . In addition, there is a problem that the cost is increased as compared with the existing refrigeration cycle apparatus.

  The present invention has been made to solve at least one of the above-described problems, and an object thereof is to provide a refrigeration cycle apparatus that supports not only AC power supply but also DC power supply.

A refrigeration cycle apparatus according to the present invention includes a compressor, a condenser, a decompression device, a refrigerant circuit in which an evaporator is connected by a refrigerant pipe, at least one auxiliary equipment, the condenser and the evaporator. A blower attached to at least one of the blowers and configured to be operable by feeding from both a DC power supply and an AC power supply. The compressor, the condenser, the pressure reducing device, and the evaporation An indoor unit on which any one of the units is mounted, and an outdoor unit on which the compressor, the condenser, the decompression device, and an apparatus that is not mounted on the indoor unit among the evaporators are mounted, The AC power source is a DC / AC converter device that is connected between the DC power source, the outdoor unit, and the indoor unit, and converts a DC voltage supplied from the DC power source into an AC voltage. The DC / AC converter device supplies power to the auxiliary equipment that is at least one of an electromagnetic valve, a pressure switch, and a belt heater provided in the indoor unit or the outdoor unit, and the DC power supply is The power supply unit supplies power to at least one of the compressor or the blower provided in the indoor unit or the outdoor unit .

  According to the refrigeration cycle apparatus according to the present invention, a direct-current power supply can be used as a primary power supply, so that a significant improvement in system efficiency can be achieved.

1 is a schematic circuit diagram schematically showing a configuration of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. It is a system block diagram which shows roughly an example of the electric power feeding structure of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is a system block diagram which shows roughly another example of the electric power feeding structure of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is a system block diagram which shows roughly another example of the electric power feeding structure of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention. It is a system block diagram which shows roughly another example of the electric power feeding structure of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention. It is a system block diagram which shows roughly another example of the electric power feeding structure of the refrigerating-cycle apparatus which concerns on Embodiment 3 of this invention. It is a circuit configuration showing an outline of an electric circuit of an AC input type refrigeration cycle apparatus. It is a circuit configuration showing an outline of an electric circuit of a DC input type refrigeration cycle apparatus.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one. Further, in the following drawings including FIG. 1, the same reference numerals denote the same or equivalent parts, and this is common throughout the entire specification. Furthermore, the forms of the constituent elements shown in the entire specification are merely examples, and are not limited to these descriptions.

Embodiment 1 FIG.
FIG. 1 is a schematic circuit diagram schematically showing a configuration of a refrigeration cycle apparatus 100 according to Embodiment 1 of the present invention. Based on FIG. 1, the apparatus structure of the refrigerating cycle apparatus 100 is demonstrated. In addition, the refrigerating cycle apparatus 100 demonstrated here is an example of an apparatus provided with the refrigerating cycle to the last, and this invention is not applied only to the refrigerating cycle apparatus 100 shown here. For example, the number of outdoor units (heat source units) and indoor units (load side units) is not limited, and the number of components mounted on them is not limited. Moreover, what is necessary is just to determine the mounting unit of a component apparatus according to the use of the refrigerating-cycle apparatus 100. FIG.

[Equipment configuration]
As shown in FIG. 1, the refrigeration cycle apparatus 100 includes an indoor unit 60 and an outdoor unit 50. The indoor unit 60 and the outdoor unit 50 are connected by refrigerant pipes 10 and 11.

<Indoor unit 60>
In the indoor unit 60, the expansion valve 3, the use side heat exchanger 4, and the compressor 1 are connected in series and mounted. In the indoor unit 60, the indoor electromagnetic valve 5 is mounted in parallel with the compressor 1, and a pressure switch 9 is mounted on the discharge side of the compressor 1. The indoor unit 60 is equipped with an indoor blower 8 that is rotated by a fan motor 8a. Furthermore, the indoor unit 60 is provided with an indoor control device 40.

The expansion valve 3 functions as a decompression device that decompresses and expands the refrigerant, and may be configured by an electronic expansion valve whose opening degree can be variably controlled.
The use side heat exchanger 4 functions as an evaporator during cooling operation and as a condenser during heating. In the vicinity of the use-side heat exchanger 4, an indoor blower 8 composed of a centrifugal fan, a multiblade fan, or the like for supplying air is attached. The indoor blower 8 is configured, for example, of a type in which the rotation speed is controlled by an inverter and the air volume is controlled. That is, the use side heat exchanger 4 exchanges heat between the air supplied from the indoor blower 8 and the refrigerant, and evaporates or condenses the refrigerant.

The compressor 1 sucks a refrigerant and compresses the refrigerant to a high temperature and high pressure state. For example, the compressor 1 is of a type in which the rotation speed is controlled by an inverter and the capacity is controlled.
Further, the compressor 1 is provided with a belt heater 1a for preventing the refrigerant from sleeping.
The indoor electromagnetic valve 5 allows passage of a part of the refrigerant discharged from the compressor 1 by controlling opening and closing.
The pressure switch 9 functions as a protection device, and is enclosed in the refrigerant circuit 101 and detects that the pressure of the refrigerant has reached a predetermined pressure.

  The indoor control device 40 includes an arithmetic device 41 that includes a general-purpose CPU, data bus, input / output port, nonvolatile memory, timer, and the like. This indoor control device 40 determines the opening degree of the expansion valve 3, the rotational speed of the indoor blower 8, the drive frequency of the compressor 1, the indoor electromagnetic wave according to the operation information (indoor air temperature, set temperature, refrigerant pipe temperature, refrigerant pressure, etc.). Predetermined control is performed for opening and closing of the valve 5 and the like. In addition, the indoor control device 40 is connected to the outdoor control device 20 described later by a transmission line (not shown), and can transmit and receive information.

<Outdoor unit 50>
In the outdoor unit 50, the heat source side heat exchanger 2 is mounted. Here, an example is shown in which two heat source side heat exchangers 2 are connected and mounted in parallel. An outdoor electromagnetic valve 6 is mounted in the outdoor unit 50 in series with one heat source side heat exchanger 2. The outdoor unit 50 is equipped with an outdoor fan 7 that is rotated by a fan motor 7a. Further, the outdoor unit 50 is provided with an outdoor control device 20.

The heat source side heat exchanger 2 functions as a condenser during cooling operation and as an evaporator during heating operation. In the vicinity of the heat source side heat exchanger 2, an outdoor blower 7 composed of a centrifugal fan, a multiblade fan, or the like for supplying air is attached. The outdoor blower 7 is configured, for example, as a type in which the rotation speed is controlled by an inverter and the air volume is controlled. That is, the heat source side heat exchanger 2 performs heat exchange between the air supplied from the outdoor blower 7 and the refrigerant, and evaporates or condenses the refrigerant.
The outdoor electromagnetic valve 6 allows the passage of a part of the refrigerant to one heat source side heat exchanger 2 by being controlled to open and close.

  The outdoor control device 20 includes an arithmetic device 21 including a general-purpose CPU, a data bus, an input / output port, a nonvolatile memory, a timer, and the like. The outdoor control device 20 determines predetermined values for the rotational speed of the outdoor fan 7 and the opening / closing of the outdoor electromagnetic valve 6 based on the operation information (indoor air temperature, set temperature, refrigerant pipe temperature, refrigerant pressure, etc.) from the indoor unit 60. Take control. In addition, the outdoor control device 20 is connected to the indoor control device 40 via a transmission line (not shown), and can transmit and receive information.

And the compressor 1, the heat source side heat exchanger 2, the expansion valve 3, and the utilization side heat exchanger 4 are connected in order by the refrigerant | coolant piping 10 and 11, and comprise the refrigerating cycle.
That is, the refrigeration cycle apparatus 100 includes a refrigerant circuit 101 configured by a refrigeration cycle including the compressor 1, the heat source side heat exchanger 2, the expansion valve 3, and the use side heat exchanger 4.

[Operation]
Next, the operation of the refrigeration cycle apparatus 100 will be described.
Here, the cooling operation performed by the refrigeration cycle apparatus 100 will be mainly described. A refrigerant is sealed in the refrigerant circuit 101 of the refrigeration cycle apparatus 100. In the refrigerant circuit 101, the refrigerant is made high temperature and high pressure by the compressor 1, discharged from the compressor 1, and flows into the heat source side heat exchanger 2. The refrigerant that has flowed into the heat source side heat exchanger 2 exchanges heat with the air supplied from the outdoor blower 7 and is condensed and liquefied. That is, the refrigerant dissipates heat and changes its state to liquid. The condensed and liquefied refrigerant flows through the refrigerant pipe 10 and flows into the expansion valve 3.

  The refrigerant flowing into the expansion valve 3 is decompressed and expanded, and changes its state to a low-temperature / low-pressure gas-liquid two-phase refrigerant of liquid and gas. This gas-liquid two-phase refrigerant flows into the use side heat exchanger 4. The gas-liquid two-phase refrigerant that has flowed into the use-side heat exchanger 4 exchanges heat with the air supplied from the indoor blower 8 to evaporate. That is, it absorbs heat from the air (cools the air) and changes its state to gas. The evaporated gasified refrigerant flows out of the use side heat exchanger 4, passes through the refrigerant pipe 11, and is sucked into the compressor 1 again.

  The air supplied to the usage-side heat exchanger 4 is cooled by the evaporation heat of the refrigerant flowing into the usage-side heat exchanger 4, and is supplied to the cooling target area where the indoor unit 60 is installed by the indoor fan 8. The temperature rises by cooling the area to be cooled or the heat generating equipment installed. Then, the air whose temperature has risen is supplied again to the use-side heat exchanger 4 by the indoor blower 8, and is cooled by the evaporation heat of the refrigerant. In this way, air (for example, room air) is circulated.

In the indoor control device 40, the necessity of the capacity is determined based on the difference between the suction temperature into the indoor unit 60 or the blow-out temperature from the indoor unit 60 and the set temperature that is the target value, and the operation of the compressor 1 is stopped. Thermo-off control is performed.
Once the thermostat is turned off, the necessity of the capacity is determined based on the difference between the suction temperature into the indoor unit or the blowout temperature from the indoor unit and the set temperature that is the target value, and the compressor 1 starts operating. Thermo-on control is performed.

[Example of power supply configuration of refrigeration cycle apparatus 100]
FIG. 2 is a system configuration diagram schematically illustrating an example of a power supply configuration of the refrigeration cycle apparatus 100. An example of the power supply configuration of the refrigeration cycle apparatus 100 will be described based on FIG.
The refrigeration cycle apparatus 100 is configured to be able to operate by receiving power supply from both a DC power supply and an AC power supply.
In addition, the electrical connection state of the apparatus (the compressor 1 and the fan motor (fan motor 7a and fan motor 8a)) which operate | moves by receiving the electric power supply from DC power supply is as having shown in FIG.

  As shown in FIG. 2, a DC power supply device 200 and an AC power supply device 300 provided outside are connected to each of the outdoor unit 50 and the indoor unit 60. That is, each of the outdoor unit 50 and the indoor unit 60 is supplied with DC power from the DC power supply device 200 and AC power from the AC power supply device 300.

In general, the power consumption of a refrigeration cycle apparatus is a compressor (specifically a compressor motor) and a blower (specifically a fan motor of a blower) among the components mounted on the refrigeration cycle apparatus. Most are consumed. A compressor, an air blower, etc. are called power system equipment.
On the other hand, among the components mounted on the refrigeration cycle apparatus, the electromagnetic valve, pressure switch, and belt heater consume relatively less power than the compressor and blower. The solenoid valves (indoor solenoid valve 5, outdoor solenoid valve 6), pressure switch 9 and belt heater 1a are collectively referred to as auxiliary equipment.

Therefore, in the refrigeration cycle apparatus 100, the power system device is driven by supplying power directly from the DC power supply from the DC power supply apparatus 200.
Further, in the refrigeration cycle apparatus 100, the auxiliary equipment is driven using an AC power source fed from the AC power source apparatus 300.
That is, if the power consumption by the DC power source is Wdc and the power consumption by the AC power source is Wac, the relationship Wdc> Wac is established.

The DC power supply device 200 and the refrigeration cycle apparatus 100 are connected by a communication line 201. Thereby, the refrigeration cycle apparatus 100 can obtain power supply information such as a DC voltage supplied from the DC power supply apparatus 200 and a remaining battery level. The refrigeration cycle apparatus 100 is used for output control of the compressor 1 and the fan motor (fan motor 7a and fan motor 8a) based on the acquired power supply information. The voltage of the DC power supply fed from the DC power supply device 200 is set to 200 V or higher.
Note that the AC power supply apparatus 300 and the refrigeration cycle apparatus 100 are also connected by a communication line 301.

  FIG. 3 is a system configuration diagram schematically illustrating another example of the power supply configuration of the refrigeration cycle apparatus 100. Based on FIG. 3, another example of the power supply configuration of the refrigeration cycle apparatus 100 will be described.

  2 shows an example in which the DC power supply device 200 and the AC power supply device 300 are connected to the outdoor unit 50 and the indoor unit 60, respectively. However, in FIG. 3, the DC power supply device 200 and the AC power supply device are connected to the outdoor unit 50. An example in which 300 is connected is shown. The indoor unit 60 is supplied with DC power from the DC power supply device 200 and AC power from the AC power supply device 300 via the outdoor unit 50.

Here, an example is shown in which the DC power supply device 200 and the AC power supply device 300 are connected to the outdoor unit 50. However, the DC power supply device 200 and the AC power supply device 300 may be connected to the indoor unit 60. . In this case, the outdoor unit 50 is supplied with DC power from the DC power supply device 200 and AC power from the AC power supply device 300 via the indoor unit 60.
Also, here, an example is shown in which both the DC power supply device 200 and the AC power supply device 300 are connected to the outdoor unit 50, but either power supply device is connected to one unit and relayed to the other unit. It is good also as a structure which does.

  Here, the case where the DC power from the DC power supply device 200 is supplied to the fan motor 7a and the fan motor 8a has been described as an example. However, the heat source side heat exchanger 2 and the use side heat exchanger 4 are described. Depending on the configuration, it may be assumed that a blower is not provided. Therefore, it is only necessary to supply the DC power from the DC power supply device 200 to at least one of the fan motor 7a and the fan motor 8a.

  As described above, according to the refrigeration cycle apparatus 100, a high-voltage DC power supply (DC power supply apparatus 200) can be used as a primary power supply. That is, as the direct current for driving the inverter device used in the refrigeration cycle apparatus 100, the supplied high direct-current voltage can be used as it is. Therefore, in the refrigeration cycle apparatus 100, it is possible to greatly increase the efficiency of the system. Thereby, the structure of the refrigeration cycle apparatus 100 can be simplified and the efficiency of the refrigeration cycle apparatus 100 can be improved.

  The outdoor control device 20 and the indoor control device 40 may be supplied with power from either power supply, but the power supply to which the uninterruptible power supply (UPS Uninterruptible Power Supply) described in the second embodiment is connected. It is advisable to supply power from the device.

Embodiment 2. FIG.
FIG. 4 is a system configuration diagram schematically showing still another example of the power supply configuration of the refrigeration cycle apparatus 100A according to Embodiment 2 of the present invention. Based on FIG. 4, another example of the power supply configuration of the refrigeration cycle apparatus 100A will be described.
The configuration other than the power feeding configuration of the refrigeration cycle apparatus 100A is as described in the first embodiment.

  In the first embodiment, the DC power supply device 200 and the AC power supply device 300 are connected to the outdoor unit 50 and the indoor unit 60, respectively. However, in the second embodiment, only the DC power supply device 200 is used as the power supply device. It shows an example that can be used.

  As shown in FIG. 4, a DC power supply device 200 is connected to each of the outdoor unit 50 and the indoor unit 60. However, in each of the outdoor unit 50 and the indoor unit 60, there are devices (electromagnetic valves (indoor electromagnetic valve 5, outdoor electromagnetic valve 6), pressure switch 9 and belt heater 1a, etc.) that are driven by an AC power supply. . Therefore, a DC / AC converter device 400 that can convert a DC power source fed from the DC power source device 200 to an AC power source is connected between the DC power source device 200 and the outdoor unit 50 and the indoor unit 60.

  Thus, as in the first embodiment, in the refrigeration cycle apparatus 100A, the AC power can be supplied to the solenoid valves (indoor solenoid valve 5, outdoor solenoid valve 6), pressure switch 9 and belt heater 1a and can be driven. It is said.

Note that the UPS 500 may be connected to the downstream side of the DC / AC converter device 400. The UPS is a device that can continue to supply power to a connected device for a certain period of time without power failure even when the power is not supplied.
In particular, the outdoor control device 20 and the indoor control device 40 have a general-purpose CPU, a data bus, an input / output port, a non-volatile memory, a timer, and the like, and have a function of controlling the constituent devices, and therefore are supplied with power. I want to avoid the situation of being lost. Therefore, the UPS 500 is a communication line to which the outdoor control device 20 and the indoor control device 40 are connected, and is connected to the downstream side of the DC / AC converter device 400 and the upstream side of the outdoor control device 20 and the indoor control device 40. It is advisable to keep power feeding continued.
The outdoor control device 20 and the indoor control device 40 correspond to the “control device” of the present invention.

  FIG. 5 is a system configuration diagram schematically showing still another example of the power supply configuration of the refrigeration cycle apparatus 100A. Based on FIG. 5, another example of the power supply configuration of the refrigeration cycle apparatus 100A will be described.

  FIG. 4 shows an example of a configuration in which power is directly supplied from the DC power supply device 200 to the DC / AC converter device 400. However, in FIG. 5, the DC power supply device 200 steps down the DC voltage to a predetermined value and then performs DC / DC conversion. An example of supplying to the AC converter device 400 is shown. That is, the DC power supply device 200 includes the step-down circuit 202, and the DC power supply voltage (for example, DC380V) supplied to the outdoor unit 50 and the indoor unit 60 and the DC power supply voltage (for example, DC power supply voltage supplied to the DC / AC converter device 400). For example, the voltage value is different from DC48V).

  As described above, according to the refrigeration cycle apparatus 100A, a high voltage DC power supply (DC power supply apparatus 200) can be used as a primary power supply. That is, as the direct current for driving the inverter device used in the refrigeration cycle apparatus 100A, the supplied high direct-current voltage can be used as it is. Therefore, in the refrigeration cycle apparatus 100A, it is possible to greatly improve the efficiency of the system. Thereby, simplification of the configuration of the refrigeration cycle apparatus 100A and higher efficiency of the refrigeration cycle apparatus 100A can be achieved. Further, according to the configuration of the refrigeration cycle apparatus 100A, the outdoor unit 50 and the indoor unit 60 can be added quickly and easily, and the expandability is improved.

Embodiment 3 FIG.
FIG. 6 is a system configuration diagram schematically showing still another example of the power supply configuration of the refrigeration cycle apparatus 100B according to Embodiment 3 of the present invention. Based on FIG. 6, another example of the power supply configuration of the refrigeration cycle apparatus 100B will be described.
The configuration other than the power feeding configuration of the refrigeration cycle apparatus 100B is as described in the first embodiment.

  In the second embodiment, only the DC power supply device 200 is used as the power supply device and the DC / AC converter device 400 is connected between the DC power supply device 200 and the outdoor unit 50 and the indoor unit 60. In the third embodiment, an example in which the DC / AC converter device 400 is mounted on the outdoor unit 50 is shown.

  As shown in FIG. 6, a DC power supply device 200 is connected to each of the outdoor unit 50 and the indoor unit 60. However, in each of the outdoor unit 50 and the indoor unit 60, there are devices (electromagnetic valves (indoor electromagnetic valve 5, outdoor electromagnetic valve 6), pressure switch 9 and belt heater 1a, etc.) that are driven by an AC power supply. . These do not operate with a DC power supply fed from the DC power supply apparatus 200. Therefore, a DC / AC converter device 400 that can convert a DC power supplied from the DC power supply device 200 into an AC power supply is mounted on the outdoor unit 50. Then, the AC power converted by the DC / AC converter device 400 can be driven by supplying power to the equipment of the outdoor unit 50, and can also be sent to the indoor unit 60 to be driven by supplying power to the equipment of the indoor unit 60. .

  Thereby, similarly to Embodiment 1, in the refrigeration cycle apparatus 100B, the AC power can be supplied to the solenoid valves (the indoor solenoid valve 5 and the outdoor solenoid valve 6), the pressure switch 9 and the belt heater 1a and can be driven. It is said.

  Here, the case where the DC / AC converter device 400 is mounted on the outdoor unit 50 has been described as an example. However, the present invention is not limited to this, and the DC / AC converter device 400 is mounted on the indoor unit 60 and the indoor unit. The AC power may be sent from 60 to the outdoor unit 50. Further, as shown in FIG. 5, the DC power supply device 200 may be configured to supply a DC voltage to the DC / AC converter device 400 after the DC voltage is stepped down to a predetermined value.

  As described above, according to the refrigeration cycle apparatus 100B, a high-voltage DC power supply (DC power supply apparatus 200) can be used as a primary power supply. That is, as the direct current for driving the inverter device used in the refrigeration cycle apparatus 100B, the supplied high direct-current voltage can be used as it is. Therefore, in the refrigeration cycle apparatus 100B, it is possible to significantly increase the efficiency of the system. This simplifies the configuration of the refrigeration cycle apparatus 100B and increases the efficiency of the refrigeration cycle apparatus 100B.

  As described above, the refrigeration cycle apparatus according to the present invention has been described separately in the first to third embodiments. For example, the DC power supply apparatus 200 is widely applied as an air conditioner installed in a facility such as an existing data center. can do.

DESCRIPTION OF SYMBOLS 1 Compressor, 1a Belt heater, 2 Heat source side heat exchanger, 3 Expansion valve, 4 Use side heat exchanger, 5 Indoor solenoid valve, 6 Outdoor solenoid valve, 7 Outdoor blower, 7a Fan motor, 8
Indoor blower, 8a fan motor, 9 pressure switch, 10 refrigerant piping, 11 refrigerant piping, 20 outdoor control device, 21 arithmetic device, 40 indoor control device, 41 arithmetic device, 50
Outdoor unit, 60 indoor unit, 100 refrigeration cycle apparatus, 100A refrigeration cycle apparatus, 100B refrigeration cycle apparatus, 101 refrigerant circuit, 200 DC power supply apparatus, 201 communication line, 202 step-down circuit, 300 AC power supply apparatus, 301 communication line, 400 DC / AC converter device.

Claims (8)

A refrigerant circuit in which a compressor, a condenser, a decompression device, and an evaporator are connected by refrigerant piping;
At least one auxiliary equipment,
A blower attached to at least one of the condenser and the evaporator,
It is configured to be operable by feeding from both DC and AC power supplies ,
An indoor unit in which any of the compressor, the condenser, the decompressor, and the evaporator is mounted;
The compressor, the condenser, the pressure reducing device, and an outdoor unit on which equipment that is not mounted on the indoor unit among the evaporators is mounted,
The AC power source is a DC / AC converter device that is connected between the DC power source and the outdoor unit and the indoor unit, and converts a DC voltage supplied from the DC power source into an AC voltage.
The DC / AC converter device supplies power to the auxiliary equipment that is at least one of a solenoid valve, a pressure switch, and a belt heater provided in the indoor unit or the outdoor unit,
The DC power supply is a refrigeration cycle apparatus that supplies power to a power system device that is at least one of the compressor or the blower provided in the indoor unit or the outdoor unit . The DC power supply includes a step-down circuit,
2. The refrigeration cycle apparatus according to claim 1, wherein the step-down circuit steps down a direct-current voltage to a predetermined value in a direct-current power supply device and then supplies the voltage to the DC / AC converter device. At least one of the compressor and the blower is
Drive with the DC power supply with a voltage of 200V or more,
At least one of the auxiliary equipment is
The refrigeration cycle apparatus according to claim 1, wherein the refrigeration cycle apparatus is driven using the AC power supply . A control device for controlling the operation of the compressor, the pressure reducing device, and the blower;
In what feeds the AC power source converted from the DC power source to the control device,
The refrigeration cycle apparatus according to any one of claims 1 to 3 , wherein an uninterruptible power supply is connected upstream of the control device. Before Symbol refrigeration cycle apparatus according to any one of claims 1-4 for supplying power to each of the DC power source and the AC power supply both the indoor unit and the outdoor unit. And feeding both the pre-Symbol DC power source and the AC power supply to at least one of the indoor unit and the outdoor unit, via the power supply to units according to any one of claims 1-4 for supplying power to the other units Refrigeration cycle equipment. The refrigeration cycle apparatus according to claim 2, wherein the refrigeration cycle apparatus is installed in a facility where the DC power supply device is already installed. The refrigeration cycle apparatus according to claim 7 , wherein the facility is a data center.

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