JP2006038290A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of using a standardized outdoor unit as it is, storing the excess refrigerant in an ice-making operation without needing a special container, and simplifying a constitution to prevent bad influence on costs. <P>SOLUTION: In this air conditioner composed of an outdoor unit 1 comprising a compressor 5 and an outdoor heat exchanger 8, a thermal storage unit 2 comprising a heat exchanger for thermal storage 24 storing the cold heat by making ice from the water, an indoor unit 3 comprising an indoor heat exchanger 31, and a refrigerant pipe P constituting a refrigeration cycle circuit R by connecting the outdoor unit 1, and the thermal storage unit 2 and the indoor unit 3, the excess refrigerant on the refrigeration cycle is stored in a liquid-side refrigerant pipe PC connecting the thermal storage unit and the indoor unit in the ice-making operation in the thermal storage unit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of an air conditioner including an ice heat storage system so as to cope with power leveling in summer, for example.

For example, an air conditioner equipped with an ice heat storage system corresponding to power leveling in summer is known. This includes an outdoor unit having a compressor and an outdoor heat exchanger, a heat storage heat exchanger for making water for ice making, a heat storage unit for storing cold heat, an indoor unit having an indoor heat exchanger, and the outdoor unit The unit is constituted by a refrigerant pipe that constitutes a refrigeration cycle circuit by connecting between the unit for heat storage and the indoor unit.
Specifically, during the time zone where the electricity rate is cheap (from 10:00 to 8:00 the next morning), the heat storage heat exchanger accommodated in the heat storage tank of the heat storage unit is operated to The ice making operation is performed to replace the water stored in the ice with ice. By storing the cold energy in the heat storage unit in this way, it is possible to improve the efficiency of the cooling operation and reduce the running cost by using the cold energy stored during the cooling operation.

The ice making operation described above has fewer refrigerant circulation parts on the refrigeration cycle than the cooling operation (hereinafter referred to as “utilizing cooling operation”) performed using the cooling energy stored in the heat storage unit. That is, the required refrigerant pipe length may be shorter during ice making operation than during use cooling operation. On the other hand, since the design standard of the refrigeration cycle is during use cooling operation, the amount of circulating refrigerant required is smaller than during use cooling operation during ice making operation, and surplus refrigerant is produced.
In practice, however, surplus refrigerant cannot be taken out of the refrigeration cycle only during the ice making operation. Therefore, a countermeasure may be considered in which a predetermined container is prepared during the refrigeration cycle, and the excess refrigerant is separately stored in the container during the ice making operation, and the circuit configuration is taken out from the container during the cooling operation. became.

For example, in [Patent Document 1], a first liquid pipe connecting a heat source side heat exchanger and a use side heat exchanger, and a second liquid pipe connected to the outlet of the heat storage heat exchanger during the condensing cold storage use operation, There is disclosed a technique characterized in that a receiver tank is provided at the intersection of the two. According to the present invention, only one receiver tank has been required, so that the cost can be reduced, and the refrigerant piping can be simplified and the apparatus can be downsized.
Japanese Patent Laid-Open No. 2002-22215

By the way, in the technique of the above-mentioned [Patent Document 1], since the number of receiver tanks conventionally required is one, not only the ice heat storage unit but also the configuration of the heat source side unit (outdoor unit) has been significantly changed. There must be. Therefore, the outdoor unit of the air conditioner which constitutes a normal heat pump refrigeration cycle cannot be used as it is, and needs a special order.
In other words, an outdoor unit for an air conditioner equipped with a heat storage unit and an outdoor unit for an air conditioner of a normal configuration that does not require a heat storage unit must be provided separately, and the cost is reduced accordingly. It will be up.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to store a surplus refrigerant at the time of ice making operation without requiring a special container, and to use a standard outdoor unit as it is. The present invention is intended to provide an air conditioner that uses an ice heat storage system to simplify the configuration and suppress adverse effects on cost.

  In order to satisfy the above-described object, the present invention provides an outdoor unit including a compressor and an outdoor heat exchanger, a heat storage unit including a heat storage heat exchanger that cools the heat storage material and stores cold energy, and indoor heat. In an air conditioner composed of an indoor unit provided with an exchanger, and an outdoor unit, a heat storage unit, and a refrigerant pipe that configures a refrigeration cycle circuit between the indoor units, when performing a cold storage operation in the heat storage unit, On the refrigeration cycle, surplus refrigerant is stored in a refrigerant pipe connecting the heat storage unit and the indoor unit.

  According to the present invention, the standardized outdoor unit can be used in an ice heat storage system as it is, by accumulating surplus refrigerant during the cold storage operation in a part of the refrigerant pipe, thereby simplifying the configuration and reducing the cost. There are effects such as suppressing the adverse effects of.

Hereinafter, an air-conditioning apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIGS. 1 to 3 all show the same refrigeration cycle configuration of the air conditioner. FIG. 1 is a pipeline diagram during cold storage operation, FIG. 2 is a pipeline diagram during utilization cooling operation, and FIG. It is a pipe line figure at the time of utilization cooling operation.
This air conditioner connects the outdoor unit 1, the heat storage unit 2, the plurality of indoor units 3, and the outdoor unit 1, the heat storage unit 2, and each indoor unit 3, and sets up the refrigeration cycle circuit R. It consists of the refrigerant pipe P which comprises.

First, the outdoor unit 1 will be described. Here, two compressors 5 are accommodated. The refrigerant pipe connected to the discharge part of each compressor 5 is joined to one refrigerant pipe P via a check valve and communicates with the oil separator 6. A refrigerant pipe P is provided through the bottom of the oil separator 6, and the refrigerant pipe opens at a predetermined height inside the oil separator. The refrigerant pipe P coming out from the bottom of the oil separator 6 is connected to one port of the four-way switching valve 7.
Connected to the other port of the four-way switching valve 7 is an outdoor heat exchanger 8, an electronic automatic expansion valve 9, a refrigerant pipe P in which a liquid tank 10 and a liquid packed valve 11 are sequentially communicated in a straight line. In particular, in the liquid tank 10, the refrigerant pipe P penetrates from the upper surface of the liquid tank and opens near the inner bottom, and another refrigerant pipe P penetrates the upper surface from the position near the inner bottom of the liquid tank 10. Then, it is connected to the liquid packed valve 11.

The refrigerant pipe P connected to the other port of the four-way switching valve 7 is connected to the introduction part of the accumulator 12. The refrigerant pipe P connected to the lead-out part of the accumulator 12 branches in two directions in the middle part, and each is connected to a suction cup 13 provided in the suction part of the compressor 5. Further, the refrigerant pipe P connected to the remaining port of the four-way switching valve 7 is connected to a gas packed valve 14 provided on the side surface of the outdoor unit 1.
The above is the circuit configuration constituting a part of the refrigeration cycle circuit R in the outdoor unit 1, but the oil return circuit 15 is further provided in the outdoor unit 1.

That is, the hatching shown in each of the compressors 5 and the oil separators 6 and the oil tank 16 to be described later indicates lubricating oil for lubricating the compression mechanism part constituting the compressor 5. A predetermined amount of lubricating oil is stored in the compressor 5, but it is inevitable that a part of the lubricating oil is mixed with the compressed refrigerant gas and discharged from the compressor 5. The oil separator 6 provided on the discharge side of the compressor 5 can separate the lubricating oil from the compressed gas and temporarily store it.
This lubricating oil component is introduced into the oil tank 16 provided between the compressors 5 through an oil return pipe 17 connected to the oil separator 6. Further, the oil return pipe 17 directs the lubricating oil in the oil tank 16 and the lubricating oil in the oil separator 6 directly to the middle part of the refrigerant pipe P communicating with the accumulator 12 and each suction cup 13. Connected through.

An oil equalizing pipe 18 having a check valve and a capillary tube is connected between each compressor 5 and the oil tank 16. By providing these oil leveling pipes 18, the lubricating oil stored in the compressors 5 is guided to the oil tank as a surplus when it reaches a predetermined height or more, and concentrated in one compressor 5. The other compressor is surely prevented from being insufficient.
In such an outdoor unit 1, refrigerant tubes PA and PB are connected to the liquid packed valve 11 and the gas packed valve 14, respectively. The refrigerant pipe connected to the liquid packed valve 11 communicates with the heat storage unit 2 as a liquid side refrigerant pipe PA, and the refrigerant pipe PB connected to the gas packed valve 14 communicates with each indoor unit 3 as a gas side refrigerant pipe. The

The heat storage unit 2 is provided with first to third packed valves 20, 21, and 22. The liquid side refrigerant pipe PA communicating with the liquid packed valve 11 of the outdoor unit 1 is connected to the first packed valve 20. The second packed valve 21 is connected to a liquid side refrigerant pipe PC that communicates with the indoor heat exchanger 31 in each indoor unit 3. The third packed valve 22 is connected to a middle portion of the gas side refrigerant pipe PB that communicates the gas packed valve 14 of the outdoor unit 1 and each indoor unit 3 via the refrigerant pipe PD.
The heat storage unit 2 includes a heat storage tank 23 for storing a heat storage material, and includes a heat storage heat exchanger 24 in a state of being immersed in the heat storage material in the heat storage tank. The refrigerant flow paths Pa to Pe are provided.

In addition, in this Embodiment, it demonstrates using water for a thermal storage material.
The first refrigerant flow path Pa is composed of a refrigerant pipe that communicates the first packed valve 20 and the second packed valve 21 with each other, and is introduced from the outdoor unit 1 through the liquid refrigerant pipe PA. Can be circulated and led to the liquid-side refrigerant pipe PC connected to the indoor unit 3. A first on-off valve 25 is provided in the first refrigerant flow path Pa.
The second refrigerant flow path Pb is a refrigerant pipe that branches off from the middle portion of the first refrigerant flow path Pa and communicates with the refrigerant introduction portion of the heat storage heat exchanger 24. The refrigerant that flows in from the side refrigerant pipe PA and is led to the first refrigerant flow path Pa can be divided and led to the heat storage heat exchanger 24. A second opening / closing valve 26 is provided in the second refrigerant flow path Pb together with a check valve.

The third refrigerant flow path Pc is composed of a refrigerant lead-out portion of the heat storage heat exchanger 24 and a refrigerant pipe communicating with the middle portion of the first refrigerant flow path Pa, and is led out from the heat storage heat exchanger 24. The refrigerant to be sent can be sent to the first refrigerant flow path Pa. A third on-off valve 27 is provided in the third refrigerant flow path Pc via a check valve.
The fourth refrigerant flow path Pd is a refrigerant pipe that connects the middle part of the third refrigerant flow path Pc and the third packed valve 22, and the refrigerant led out from the heat storage heat exchanger 24 is used as the fourth refrigerant flow path Pd. The gas can be guided to the gas side refrigerant pipe PB through the third packed valve 22 and the refrigerant pipe PD. A fourth on-off valve 28 is provided in parallel in the fourth refrigerant flow path Pd.

The fifth refrigerant flow path Pe includes a refrigerant discharge side of the first on-off valve 25 in the first refrigerant flow path Pa and a refrigerant discharge side of the second on-off valve 26 in the second refrigerant flow path Pb. It is a refrigerant pipe connected between them. The fifth refrigerant channel Pe guides the refrigerant guided to the first refrigerant channel Pa to the heat storage heat exchanger 24 via the fifth refrigerant channel Pe and the second refrigerant channel Pb. it can. Conversely, the second refrigerant flow path Pb can be led to the first refrigerant flow path Pa through the fifth refrigerant flow path Pe. An electronic automatic expansion valve 29 is provided in the fifth refrigerant channel Pe.
On the other hand, each indoor unit 3 accommodates an electronic automatic expansion valve 30 and an indoor heat exchanger 31. The electronic automatic expansion valve 30 and the indoor heat exchanger 31 are branched from the liquid side refrigerant pipe PC. The branch refrigerant pipe Pf communicates in series. Each indoor heat exchanger 31 communicates with the gas-side refrigerant pipe PB via a branch refrigerant pipe Pg.

Next, the operation of the air conditioner including the refrigeration cycle circuit R configured as described above will be described.
(1) Cold storage operation (Fig. 1)
The cold storage operation of the air conditioner shown in FIG. 1 is performed by, for example, storing a liquid refrigerant from the outdoor heat exchanger 8 of the outdoor unit 1 in the heat storage unit 2 in a time zone where the electricity rate from 10:00 to 8:00 the next morning is low. In this operation, the water stored in the heat storage tank 23 is cooled to store the cold energy, and the water stored in the heat storage tank 23 is normally stored in place of ice. Hereinafter, it demonstrates as ice-making operation.

At this time, in the heat storage unit 2, the first on-off valve 25 and the fourth on-off valve 28 are opened, the second on-off valve 26 and the third on-off valve 27 are closed, and the electronic automatic expansion valve 29 is opened. Is controlled to auto-expand. In addition, the electronic automatic expansion valve 9 of the outdoor unit 1 is fully opened, and the electronic automatic expansion valves 30 of each indoor unit 3 are all controlled to be fully closed.
Two compressors 5 are driven under such settings. The high-temperature and high-pressure refrigerant gas discharged in accordance with the refrigerant compression operation of the compressor 5 is led to the outdoor heat exchanger 8 through the oil separator 6 and the four-way switching valve 7, where it is condensed and liquefied. The liquid refrigerant passes through the fully-opened electronic automatic expansion valve 9 as it is, led from the liquid tank 10 through the liquid side packed valve 11 to the liquid side refrigerant pipe PA, led out from the outdoor unit 1 and first of the heat storage unit 2. To the packed valve 20.

In the heat storage unit 2, the second on-off valve 26 and the third on-off valve 27 are closed, the first on-off valve 25 and the fourth on-off valve 28 are opened, and the electronic automatic expansion valve 29 is opened. Therefore, the liquid refrigerant is guided from the first packed valve 20 to the first refrigerant flow path Pa, and directly flows from the second packed valve 21 into the liquid side refrigerant pipe PC. Is divided from the middle of the refrigerant flow path Pa and led to the fifth refrigerant flow path Pe.
The liquid refrigerant that exits the heat storage unit 2 from the first refrigerant flow path Pa and is led to the liquid side refrigerant pipe PC is such that the electronic automatic expansion valve 30 in each indoor unit 3 is fully closed. Distribution is blocked by the automatic expansion valve and does not flow to the indoor heat exchanger 31. That is, the liquid refrigerant is accumulated over a part of the first refrigerant flow path Pa and the entire length of the liquid side refrigerant pipe PC.

On the other hand, the liquid refrigerant guided to the fifth refrigerant flow path Pe is subjected to adiabatic expansion control by the electronic automatic expansion valve 29 and further from the second opening / closing valve 26 leading side which is a part of the second refrigerant flow path Pb. It is led to the heat storage heat exchanger 24 in the heat storage tank 23. The refrigerant adiabatically expanded in the heat storage heat exchanger 24 evaporates by exchanging heat with the water stored in the heat storage tank 23 and takes away latent heat of evaporation from the water. Water turns into ice as soon as the temperature drops. That is, the ice making operation is performed in the heat storage tank 23.
The refrigerant evaporated in the heat storage heat exchanger 24 is guided to the fourth refrigerant flow path Pd, passes through the fourth on-off valve 28, passes through the third packed valve 22, and is led out from the heat storage unit 2. The The evaporative refrigerant is guided to the gas side refrigerant pipe PB and returns to the outdoor unit 1. Then, in the outdoor unit 1, the air is sucked into each compressor 5 through the four-way switching valve 7, the accumulator 12 and the suction cup 13, compressed again, and circulated through the above-described path.
In this way, the ice making operation is performed smoothly. In the ice making operation, the necessary piping length is shorter than that in the later-described use cooling operation, and therefore, the refrigerant encapsulated in accordance with the use cooling operation remains. However, during the ice making operation, surplus refrigerant can be stored in the liquid side refrigerant pipe PC communicating from the heat storage unit 2 to the indoor unit 3. Since a special container (receiver tank) is unnecessary and a part of the refrigeration cycle circuit R can be used as it is to store excess refrigerant, the configuration can be simplified.

(2) Cooling operation (Fig. 2)
The cooling operation shown in FIG. 2 is supercooled by supplying the liquid refrigerant led from the outdoor unit 1 to the heat storage unit 2 to the heat storage heat exchanger 24 in the heat storage unit, for example, during the daytime, when the temperature rises. The state (undercool) is set, and the supercooled liquid refrigerant is supplied to the indoor heat exchanger 31 of the indoor unit 3.
In this case, in the heat storage unit 2, the second on-off valve 26 and the third on-off valve 27 are opened, the first on-off valve 25 and the fourth on-off valve 28 are closed, and the electronic automatic expansion valve 29 is opened. Is controlled to automatically expand based on a detection signal of a temperature sensor TLi attached to the first refrigerant flow path Pa in the vicinity of the second packed valve 21. Further, the electronic automatic expansion valve 9 in the outdoor unit 1 is fully opened, and the electronic automatic expansion valve 30 in each indoor unit 3 is controlled to automatically expand.

Two compressors 5 are driven under such settings. The high-temperature and high-pressure refrigerant gas discharged along with the refrigerant compression operation of the compressor 5 is led to the outdoor heat exchanger 8 through the oil separator 6 and the four-way switching valve 7 to be condensed and liquefied. The liquid refrigerant passes through the fully opened electronic automatic expansion valve 9, is led from the liquid tank 10 to the liquid side refrigerant pipe PA via the liquid side packed valve 11, is led out from the outdoor unit 1, and is first in the heat storage unit 2. Guided to the packed valve 20.
In the heat storage unit 2, the first on-off valve 25 and the fourth on-off valve 28 are closed, and the second on-off valve 26 and the third on-off valve 27 are opened. The refrigerant led to 20 immediately flows into the second refrigerant flow path Pb from the first refrigerant flow path Pa, and is introduced to the heat storage heat exchanger 24 in the heat storage tank 23 via the second on-off valve 26. It is burned. Here, the cold energy stored by the previous ice making operation is absorbed (the ice in the heat storage tank 23 is deiced), and the supercooled state is led to the third refrigerant flow path Pc.

On the other hand, there is a liquid refrigerant that is diverted from the second refrigerant flow path Pb and guided to the fifth refrigerant flow path Pe, and the flow rate is controlled by the electronic automatic expansion valve 29 to be guided to the first refrigerant flow path Pa. It is burned. In a state where the first opening / closing valve 25 is bypassed, the flow returns to the first refrigerant flow path Pa and is guided to the second packed valve 21. In the middle of this, it is mixed with the supercooled liquid refrigerant guided from the heat storage heat exchanger 24 via the third refrigerant flow path Pc.
Eventually, all the liquid refrigerant is led out from the heat storage unit 2 and led to the electronic automatic expansion valve 30 of each indoor unit 3 through the liquid side refrigerant pipe PC, where it is adiabatically controlled to evaporate in the indoor heat exchanger 31. To do. Each indoor heat exchanger 31 evaporates by removing latent heat of evaporation from the indoor air, and performs an indoor cooling function.

  In particular, since the refrigerant that has been led to the heat storage heat exchanger 31 of the heat storage unit 2 and is in a supercooled state is led to each indoor heat exchanger 31 and evaporates, the cooling efficiency can be improved. In addition, the temperature sensor TLi detects the refrigerant temperature at the outlet of the heat storage unit 2 and controls to adjust the opening degree of the electronic automatic expansion valve 29 provided in the fifth refrigerant flow path Pe based on the detection signal. That is, the amount of refrigerant led to the heat storage heat exchanger 24 is controlled so as to keep the temperature of the liquid refrigerant passing through the outlet of the heat storage tank 23 of the heat storage unit 2 constant, and the heat storage use cooling maintenance time is maintained for a long time. Can improve performance.

(3) Non-use cooling operation (Fig. 3)
The non-use cooling operation shown in FIG. 3 is a cooling operation that is carried out without using the stored cold energy, which is ice stored in the heat storage tank 23 in the heat storage unit 2.
In this case, in the heat storage unit 2, only the first on-off valve 25 is opened, the second on-off valve 26 to the fourth on-off valve 28 are closed, and the electronic automatic expansion valve 29 is fully closed. The electronic automatic expansion valve 9 in the outdoor unit 1 is fully opened, and the electronic automatic expansion valve 31 in each indoor unit 3 is controlled to automatically expand.

Two compressors 5 are driven under such settings. The high-temperature and high-pressure refrigerant gas discharged along with the refrigerant compression operation of the compressor 5 is led to the outdoor heat exchanger 8 through the oil separator 6 and the four-way switching valve 7 to be condensed and liquefied. The liquid refrigerant passes through the fully opened electronic automatic expansion valve 9, is led from the liquid tank 10 to the liquid side refrigerant pipe PA via the liquid side packed valve 11, is led out from the outdoor unit 1, and is first in the heat storage unit 2. Guided to the packed valve 20.
In the heat storage unit 2, only the first on-off valve 25 is opened, the second on-off valve 26 to the fourth on-off valve 28 are closed, and the electronic automatic expansion valve 29 is fully closed. The refrigerant is guided from the first packed valve 20 to the first refrigerant flow path Pa, and is led out from the heat storage unit 2 through the second packed valve 21 as it is.

The liquid refrigerant is led to the electronic automatic expansion valve 30 of each indoor unit 3 through the liquid side refrigerant pipe PC, and adiabatically expands and evaporates in the indoor heat exchanger 31 here. Each indoor heat exchanger 31 evaporates by removing latent heat of evaporation from the indoor air, and performs an indoor cooling function.
In addition, after switching the refrigerant | coolant conduction | electrical_connection direction of the four-way switching valve 7, the electronic automatic expansion valve 9 in the outdoor unit 1 is automatically expanded, only the first on-off valve 25 of the heat storage unit 2 is opened, and the second If the on-off valve 26 to the fourth on-off valve 28 and the electronic automatic expansion valve 29 are closed and the electronic automatic expansion valve 30 of the indoor unit 3 is fully opened to allow the refrigerant to flow, heating operation can be performed. Detailed description is omitted.

In any case, if the air conditioner of the present invention is adopted, it is assumed that an ice heat storage system that uses the cold heat stored at night as an undercooling during daytime cooling operation is provided, and the excess refrigerant during ice making operation is refrigerated. The refrigerant pipe PC constituting a part of the cycle circuit R can be stored as it is. Since it is not necessary to separately provide a special container for storing surplus refrigerant, it is possible to suppress the increase in parts cost and the number of mounting steps, and promote the downsizing of the apparatus.
In particular, since it is not necessary to provide a special container for the outdoor unit 1, the conventional standard type outdoor unit can be used as it is for an air conditioner equipped with this heat storage system, and the air conditioner is inexpensive as a whole. A device can be provided.

Further, during ice making operation, the amount of refrigerant necessary for ice making is adjusted by adjusting the opening degree of the automatic electronic expansion valve 29 provided in the fifth refrigerant flow path Pe of the heat storage unit 2 so as to be a heat exchanger for ice making. Since it is guided to the heat exchanger 24, an efficient ice making operation is possible.
Further, in the cooling operation using the heat storage, during the cooling operation, the temperature detected by the temperature sensor TLi attached to the outlet of the first refrigerant channel Pa is constant in the fifth refrigerant channel Pe. Since the opening degree of the electronic automatic expansion valve 29 is controlled, it becomes possible to supply a constant cooling capacity without being affected by the temperature change in the heat storage tank 23, and to make the use cooling maintenance time as long as possible. Can continue.

The heat storage unit 2 includes a first packed valve 20 for connecting a refrigerant pipe PA communicating with the outdoor unit 1 and a second packed valve 21 for connecting a refrigerant pipe PC communicating with the indoor unit 3. Two connection ports become the conduction side of the liquid refrigerant. Further, one connection port of the third packed valve 22 for connecting the refrigerant pipe PB that communicates the outdoor unit 1 and the indoor unit 3 is a gas refrigerant conduction side.
Eventually, the heat storage unit 2 includes a total of three connection ports, and the refrigerant is guided in the same direction in the heat storage heat exchanger 24 during the ice making operation and the use cooling operation. Thereby, the structure in the heat storage unit 2 can be simplified, and a low-cost heat storage unit can be provided. Further, by consolidating the gas side refrigerant pipes PB communicating with the heat storage unit 2 into one, it is possible to avoid mistakes in piping work, to improve installation workability, and to reduce construction costs.

1 shows an embodiment according to the present invention, and is a configuration diagram of a refrigeration cycle of an air conditioner, and is also a pipeline diagram during a cold storage operation. It is the refrigeration cycle block diagram of an air conditioning apparatus which shows the same embodiment, and is also a pipeline diagram at the time of utilization cooling operation. It is the refrigeration cycle block diagram of an air conditioning apparatus which shows the same embodiment, and is also a pipeline diagram at the time of non-use cooling operation.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 5 ... Compressor, 8 ... Outdoor heat exchanger, 1 ... Outdoor unit, 24 ... Heat storage heat exchanger, 2 ... Heat storage unit, 31 ... Indoor heat exchanger, 3 ... Indoor unit, P ... Refrigerant pipe, Pa ... No. 1 refrigerant flow path, 25 ... first on-off valve, Pb ... second refrigerant flow path, 26 ... second on-off valve, Pc ... third refrigerant flow path, 27 ... third on-off valve, Pd ... 4th refrigerant | coolant flow path, 28 ... 4th on-off valve, Pe ... 5th refrigerant | coolant flow path, 29 ... Electronic automatic expansion valve.

Claims (2)

An outdoor unit with a compressor and an outdoor heat exchanger;
A heat storage unit equipped with a heat storage heat exchanger that cools the heat storage material and stores cold energy; and
An indoor unit with an indoor heat exchanger;
In the air conditioner configured by the refrigerant pipe that configures the refrigeration cycle circuit by connecting the outdoor unit, the heat storage unit, and the indoor unit,
An air conditioner characterized in that, when performing a cold storage operation in the heat storage unit, an excess refrigerant in the refrigeration cycle is stored in the refrigerant pipe connecting the heat storage unit and the indoor unit. The heat storage unit is
A first refrigerant flow path for guiding the refrigerant flowing from the liquid refrigerant pipe connected to the outdoor unit to the liquid refrigerant pipe connected to the indoor unit, and a first on-off valve provided in the first refrigerant flow path When,
A second refrigerant channel that guides the refrigerant flowing from the liquid side refrigerant pipe of the outdoor unit to the heat storage heat exchanger, and a second on-off valve provided in the second refrigerant channel;
A third refrigerant channel that guides the refrigerant derived from the heat storage heat exchanger to the first refrigerant channel, and a third on-off valve provided in the third refrigerant channel;
A fourth refrigerant flow path for guiding the refrigerant derived from the heat storage heat exchanger to a gas-side refrigerant pipe communicating with the outdoor unit and the indoor unit, and a fourth on-off valve provided in the fourth refrigerant flow path When,
A fifth refrigerant flow connected between the refrigerant outlet side of the first on-off valve in the first refrigerant passage and the refrigerant outlet side of the second on-off valve in the second refrigerant passage. The air conditioner according to claim 1, further comprising a passage and an expansion valve provided in the fifth refrigerant passage.

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