JP5193632B2 - Air conditioning and power generation system - Google Patents

Description

  The present invention relates to an air conditioning and power generation system that simultaneously performs air conditioning and power generation by driving a compressor and a generator by driving force of an internal combustion engine such as an engine.

  In a conventional engine-driven air conditioner, in an outdoor unit, an air-conditioning operation is performed by driving a compressor that compresses a refrigerant with a driving force of an internal combustion engine such as a gas engine. In recent years, a generator is connected to an internal combustion engine such as a gas engine, the generator is driven by this driving force to generate power, and the power generated by the generator is blown to, for example, an outdoor heat exchanger. Realization of a generator-driven engine-driven air conditioner (air conditioning / power generation system) that supplies power to a load device such as a blower or a cooling water pump that cools the internal combustion engine and does not supply power is being sought. (For example, refer to Patent Document 1).

Furthermore, the generator is equipped with a generator having a large power generation capacity and is driven by the driving force of the internal combustion engine, and the voltage and frequency of the commercial power source are detected to supply power suitable for the commercial power source to the system. An engine-driven air conditioner with a generator that can be supplied via an interconnection circuit has been proposed. (For example, refer to Patent Document 2).
JP-A-5-231745 JP 2006-296039 A

  However, the conventional engine-driven air conditioner with a generator has an engine, a compressor, and the like, and a grid interconnection circuit including a converter unit and an inverter unit is provided in its casing, so that it can be configured compactly. Even if it is called “commercial power”, there are AC100V, AC200V, single-phase power supply, three-phase power supply, etc. in Japan. Had to be a small amount.

  In particular, when considering overseas expansion, it was necessary to further increase the number of varieties.

  Therefore, the present invention provides an engine-driven air conditioner (air conditioning / power generation system) with a generator that can simplify the model configuration.

The first invention includes a compressor driven by the driving force of the engine, a generator driven by the driving force of the engine, and converts the power generated by the generator into DC power by the converter unit. A grid interconnection circuit that converts and converts the DC power into AC power suitable for commercial power by an inverter unit, and controls increase / decrease in the amount of power generated by the generator based on received power from the commercial power In the air conditioning / power generation system, the grid interconnection circuit includes an output unit that can supply at least the DC power converted by the converter unit, and the grid interconnection circuit includes the converter unit and the inverter unit. The converter part
Is provided in the same first casing as the compressor, the inverter unit is provided in a second casing different from the first casing, and the first casing and the second casing are: The DC power line is connected to at least the DC power line via a terminal provided in each casing, and the converter section in the first casing and the inverter section in the second casing are connected to each other. The converter unit and the inverter unit are connected by a control line, and the inverter unit is also controlled via the control line by a control device that controls the converter unit. It is.

  According to the present invention, the DC power converted by the converter unit can be supplied from the air conditioning / power generation system. Therefore, the inverter unit can be connected to a commercial power source using a general-purpose inverter circuit or the like and can be supplied with power. Therefore, even if power supply suitable for various commercial power sources is performed, the model configuration of the engine-driven air conditioner with a generator can be simplified.

  Thereby, since the said model structure can be made into a small variety, it becomes possible to comprise and supply an inexpensive air conditioning and electric power generation system.

  The converter unit is provided in the same first casing as the engine and the compressor, and the inverter unit is provided in a second casing different from the first casing. These casings are provided in the respective casings. Since it is assumed that they are connected by at least a DC power line through the provided terminals, if necessary, a plurality of second housings can be connected and a plurality of commercial power supplies can be supplied simultaneously. Become.

  In addition to the power line, the converter unit and the inverter unit are connected by a control line, so that the entire system can be controlled in the same manner as a conventional engine-driven air conditioner with a generator. Therefore, it is possible to supply electric power sufficiently suitable for a commercial power supply.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an engine-driven air conditioner with a generator to which the present invention is applied. First, an outline of the air conditioner 1 will be described with reference to FIG.

  The air conditioner 1 includes an outdoor unit 2 and an indoor unit 3, which are connected by an inter-unit pipe 4 including a liquid pipe 4a and a gas pipe 4b. The outdoor unit 2 includes a first housing 2a and a second housing 2b. The outdoor unit 2 includes, for example, a gas engine 10 using a gas such as 13A or propane as fuel, and the gas. A generator 11 that generates power using the driving force of the engine 10 and a compressor 12 that compresses the refrigerant using the driving force of the gas engine 10 are housed. The gas engine 10 generates a driving force by combusting an air-fuel mixture of a fuel such as a gas supplied via a fuel adjustment valve 7 and air supplied via a throttle valve 8.

  The compressor 12 is composed of compressors 12a and 12b having large and small capacities, and two of them are connected to the gas engine 10 in parallel via electromagnetic clutches 14a and 14b, respectively. The discharge pipes 12c of the compressors 12a and 12b are connected in the order of the plate heat exchanger 31, the four-way valve 15, and the outdoor heat exchanger 17, and the outdoor heat exchanger 17 is connected to the indoor through the liquid pipe 4a. The expansion valve 19 of the unit 3 and the indoor heat exchanger 21 are connected. The indoor heat exchanger 21 is connected to a four-way valve 15 via a gas pipe 4b. The four-way valve 15 includes compressors 12a and 12b. Is connected. Further, the discharge pipe 12c and the suction pipe 12d of the compressors 12a and 12b are connected by a bypass pipe 18, and an unloading bypass valve 20 is connected to the bypass pipe 18.

  By the way, when the compressors 12a and 12b are driven, if the four-way valve 15 is switched, and if it is heating switching, the compressors 12a and 12b, the four-way valve 15 and the indoor heat exchange are indicated as indicated by solid arrows. The refrigerant circulates in the order of the vessel 21, the expansion valve 19, and the outdoor heat exchanger 17, and the room is heated by the refrigerant condensation heat in the indoor heat exchanger 21. On the other hand, if the four-way valve 15 is switched to cooling, the compressors 12a and 12b, the four-way valve 15, the outdoor heat exchanger 17, the expansion valve 19, and the indoor heat exchanger 21 are shown as indicated by broken arrows. The refrigerant circulates sequentially, and the room is cooled by the refrigerant evaporation heat in the indoor heat exchanger 21.

  Next, a cooling device for the gas engine 10 will be described.

  The gas engine 10 is water-cooled, and the cooling water circulated through the water jacket of the gas engine 10 is supplied to the radiator 25 through the first three-way valve 22 and the second three-way valve 24. The radiator 25 is provided together with the outdoor heat exchanger 17, which are air-cooled by air sent by the same blower 26, and the cooling water that has passed through the radiator 25 is supplied to the cooling water pump 27 and the exhaust gas heat exchanger 29. It flows in order and is returned to the water jacket of the gas engine 10.

  Exhaust gas from the gas engine 10 is passed through the exhaust gas heat exchanger 29, and this exhaust gas is discharged out of the outdoor unit 2 through the exhaust top 30.

  The first three-way valve 22 described above is automatically switched according to the cooling water temperature. That is, when the cooling water temperature is lower than the predetermined temperature, the cooling water from the water jacket of the gas engine 10 is bypassed by the radiator 25 and directly led to the cooling water pump 27 and the exhaust gas heat exchanger 29 in this order. Return to the jacket.

  The second three-way valve 24 is switched, for example, during heating operation. In this case, the cooling water bypasses the radiator 25, passes through the plate heat exchanger 31, and flows in the order of the cooling water pump 27 and the exhaust gas heat exchanger 29. Returned to the water jacket.

  Next, a power generation system using the generator 11 will be described.

  A grid interconnection inverter 33 is connected to the generator 11, and the grid interconnection inverter 33 (system interconnection circuit) converts the three-phase AC power from the generator 11 into DC power via the converter unit 33 a. Is then converted into 100V / 200V AC power via the inverter 33b and output to the commercial power system 35. The commercial power system 35 includes a commercial power source 36, a breaker 37, and a consumer load 38, and the grid interconnection inverter 33 is connected between the breaker 37 and the consumer load 38.

  A power detector 43 installed between the commercial power source 36 and the breaker 37 is connected to the grid interconnection inverter 33. The power detector 43 acquires the power value supplied to the commercial power system 35 in real time, and the acquired power value data is input to the grid interconnection inverter 33 and is connected to the outdoor controller 39 via the communication line 40. Sent to.

  Further, the grid interconnection inverter 33 has a function of controlling the power generation amount of the generator 11 and decreases or increases the power generation amount as necessary. Further, this power generation is performed by using surplus power that the generator 11 drives the compressor 12.

  In the above configuration, for example, when the load on the compressors 12a and 12b increases according to the air conditioning request on the indoor unit 3 side, and the power generation request increases according to the increase in the consumer load 38 of the commercial power system 35, The load on the engine 10 increases.

  The customer load 38 is constantly monitored by the power detector 43, the grid interconnection inverter 33, and the outdoor controller 39.

  In addition, a grid interconnection board 60 is connected between the power detector 43 and the outdoor unit 2.

  And the converter part 33a is provided in the 1st housing | casing 2a of the same outdoor unit as the said compressor 11, and the said inverter part 33b is provided in the 2nd housing | casing 2b different from the said outdoor unit, The first housing 2a and the second housing 2b are provided with an output unit 2c and an input unit 2d that connect the power line 33c and the control line 33d to each other. The output unit 2c and the input unit 2d are provided with connection means such as terminals and connectors (not shown). By connecting via the power line 33c and the control line 33d, the DC power, the control signal, etc. are exchanged. Is to be done.

  When the operation of the gas engine 10 is started by the outdoor controller 39, the generator 11 is driven by the driving force of the gas engine 10, and the three-phase AC power generated by the generator 11 is converted into the converter 33a. The DC power converted into DC power is sent from the output unit 2c of the converter unit 33a via the power line 33c, and supplied from the input unit 2d of the inverter unit 33b to the inverter unit 33b. . And in this inverter part 33b, based on the electric power value data from the electric power detector 43 and the grid connection board 60, and the control signal transmitted via the communication line 40 and the control line 33d from the outdoor controller 39, electric power Electric power is supplied from the supply line 34 to the commercial power system 35. The communication performed via the control line 33d may be performed by serial communication using a signal line and a ground line, or may be performed by parallel communication using a contact signal using a multi-line signal line. .

  And the inverter part 33b is provided in the 2nd housing | casing 2b different from the 1st housing | casing 2a in which the gas engine 10, the generator 11, and the converter part 33a are provided in this way, The said 1st housing | casing 2a By providing the output unit 2c that can supply DC power converted to DC, the configuration of the inverter unit 33b provided in the second housing 2b can be achieved even when the commercial power system has many types. It is possible to deal with various commercial electric power systems only by changing, and it is possible to cope without changing the configuration of the devices constituting the first housing 2a, so that the device configuration can be simplified.

  In such a configuration, as shown in FIG. 2, a general-purpose inverter unit 55b can be provided instead of the inverter unit 33b.

  In the general-purpose inverter unit 55a, the communication form with the converter unit 33a performed via the control line 33d is not necessarily the same, so only the power line 33c is connected, and the inverter unit 55b is independent. Driving will be performed. Needless to say, even if the inverter unit 55b is a general-purpose product, if the inverter unit 55b can communicate with the converter unit 33a, a control line 33d may be provided for communication. Further, the communication performed via the control line 33d may be performed by serial communication using a signal line and a ground line, or may be performed by parallel communication using a contact signal using a multi-line signal line. .

  In FIG. 2, the same functions as those in FIG. 1 are denoted by the same reference numerals, and the difference from FIG. 1 is provided in the second housing 2b as described above. It is only that the inverter unit 55b is a general-purpose inverter unit.

  Even in this case, as described above, even if there are many types of commercial power systems, only the general-purpose inverter unit 55b (that is, the second casing 2b) is changed, and various commercial power systems can be connected. It is possible to cope with this, and it is possible to deal with without changing the configuration of the device constituting the first housing 2a, so that the device configuration can be simplified.

  As described above, by providing the grid interconnection circuit of the air conditioning / power generation system with an output unit that can supply at least DC power converted by the converter unit, the configuration of a model that can support various commercial power systems is achieved. It can be simplified.

  Further, although the present invention has been described based on the above embodiment, the present invention is not limited to this. For example, in the above embodiment, the inverter unit connected from the converter unit 33a by the power line 33c or the like has been described as connecting only the inverter unit 33b or the general-purpose inverter unit 55b, but a plurality of output units 2c are connected to the output unit 2c. The inverter part may be connected. As a result, power can be supplied to various commercial power systems at the same time. Alternatively, a plurality of inverter units may be connected to the output unit 2c, and outputs of these inverter units may be connected to the same commercial power system. As a result, when any one of the inverter units becomes unable to supply power due to damage or the like, it is possible to supply power as a backup.

It is a block diagram of the engine drive type air conditioning apparatus with a generator to which this invention is applied. In the said FIG. 1, it is a block diagram of the engine drive type air conditioner with a generator which provided the general purpose inverter part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine drive type air conditioner with a generator 2 Outdoor unit 2a 1st housing | casing 2b 2nd housing | casing 2c Output part 2d Input part 3 Indoor unit 4 Refrigerant pipe 4a Liquid pipe 4b Gas pipe 10 Gas engine 11 Generator 12 Compressor 33 System interconnection inverter 33a Converter unit 33b Inverter unit 33c Power line 33d Control line 35 Commercial power system 36 Commercial power supply 37 Breaker 38 Customer load 39 Outdoor controller 40 Communication line 43 Power detector 55a General-purpose inverter unit 60 System interconnection board

Claims (1)

A compressor driven by the driving force of the engine, a generator driven by the driving force of the engine, and converting the electric power generated by the generator into DC power by a converter unit; In the air conditioning and power generation system including a grid interconnection circuit that converts the power generation amount of the generator based on the received power from the commercial power source by converting the AC power into the AC power suitable for the commercial power source by the inverter unit,
The grid interconnection circuit includes an output unit capable of supplying at least the DC power converted by the converter unit,
The grid interconnection circuit includes the converter unit and the inverter unit. The converter unit is provided in the same first casing as the compressor, and the inverter unit is different from the first casing. Provided in two housings, and the first housing and the second housing are connected by a power line of at least the DC power via terminals provided in the respective housings,
The converter section in the first casing and the inverter section in the second casing are connected by the power line of the DC power, and the converter section and the inverter section are connected by a control line, and the converter section The air conditioning and power generation system , wherein the inverter unit is also controlled via the control line by a control device to control .

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