JPH05264077A - Heat storage type air-conditioning apparatus - Google Patents

Abstract

PURPOSE:To enable the continuation of safe operation by providing bypass circuit between a circuit for general cooling and a circuit for releasing cold heat in a setup to allow the refrigerant to flow from the liquid line of one circuit to that of the other circuit and from the gas line of one circuit to that of the other circuit. CONSTITUTION:A general-cooling circuit 17 operating with a compressor 1 in the circuit and a cold heat-releasing circuit 18 operating with a refrigerant pump 13 in the circuit are provided each as a circuit functioning independent of the other and each with either of evaporators 4a, 4b in the line. Bypass circuit 19, 20 are provided, which connect respectively the gas lines 17b, 18b and the liquid lines 17a, 18a of the two circuits 17, 18 so as to enable the refrigerant to flow from one to the other of the two circuits 17, 18. To store cold heat, the bypass circuit 19, 20 are opened to form a cold heat-storing circuit which is passed through the compressor 1, a condenser 2, a first pressure-reducing mechanism 3, and a cold heat-storing heat exchanger 9 and cold heat energy is accumulated in a heat storage tank 8. The bypass circuit 19, 20 are shut off when either of the two circuits 17, 18 is operated separately or both of them are operated simultaneously; therefore, the cooling capacity does not decrease or vary when the amount of the refrigerant in the circuit 17, 18 is appropriate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to suppression of daytime electric power and leveling measures, and more particularly to a heat storage type air conditioner equipped with a heat storage tank containing a heat storage medium.

[0002]

2. Description of the Related Art FIG. 10 is a cycle diagram showing a circuit configuration of a conventional heat storage type air conditioner disclosed in, for example, Japanese Patent Application Laid-Open No. 2-33573. This circuit includes a compressor 1, a condenser 2 and a first circuit. 1. A main refrigerant circuit 6 in which a pressure reducing mechanism 3 and an evaporator 4 are sequentially connected, a heat storage tank 8 containing a heat storage medium 7, and a heat storage medium for exchanging heat with the heat storage medium 7 in the heat storage tank 8 and a refrigerant. A heat exchanger 9, and a first bypass circuit 10 that enables the movement of the refrigerant in the liquid line 5a and the gas line 5b between the condenser 2 and the pressure reducing mechanism 3 via the heat storage heat exchanger 9. A second pipe provided in the liquid pipe 10a of the first bypass circuit 10
A pressure reducing mechanism 11, a refrigerant gas pump 13 that circulates a refrigerant to exchange heat between the heat storage medium stored in the heat storage tank 8 and the refrigerant, and the refrigerant gas pump 13 described above. The first bypass circuit 10 includes a second bypass circuit 12 provided in the gas pipe 10b, and an opening / closing device 14 that controls the flow of the refrigerant into the second bypass circuit 12.

Next, the operation will be described. Each of the above devices 1
Reference numerals 4 to 4 are connected to each other through a refrigerant pipe 5 so that the refrigerant can flow therethrough, and a main refrigerant circuit 6 that gives cold heat obtained by heat exchange with outdoor air in the condenser 2 to indoor air in the evaporator 4 is configured. Has been done. On the other hand, a heat storage tank 8 containing a heat storage medium 7 capable of storing heat is arranged in the apparatus, and for heat storage for performing heat exchange between the refrigerant and the heat storage medium 7 in the heat storage tank 8 inside the heat storage tank 8. A heat exchanger 9 is arranged. During normal cooling operation (hereinafter, referred to as general cooling operation), the operation is performed with the second pressure reducing mechanism 11 closed, and the refrigerant circulates only in the main refrigerant circuit 6. That is, the refrigerant gas discharged from the compressor 1 is condensed in the condenser 2 and adiabatically expanded in the first decompression mechanism 3 to become a low-temperature gas-liquid two-phase fluid and enters the evaporator 4, where heat from the surroundings is generated. Robbing the air and cooling it, evaporating itself and the compressor 1
Circulate back to. Further, during a cold storage operation in which cold heat is stored in the heat storage tank 8 (hereinafter, referred to as a cold storage operation) by utilizing a time zone in which the power load is small at night, the operation is performed with the first pressure reducing mechanism 3 closed. .. That is, the refrigerant gas discharged from the compressor 1 is condensed in the condenser 2 to become a high-temperature and high-pressure refrigerant, flows into the first bypass circuit 10, and is adiabatically expanded by the second pressure reducing mechanism 11, and then heat exchange for heat storage. By evaporating in the container 9, cold heat is stored in the heat storage medium 7 in the heat storage tank 8. After evaporation, it passes through the opening / closing device 14 and returns to the compressor 1. When the refrigerant gas pump 13 is operated when the compressor 1 is stopped, as a cold storage heat recovery operation (hereinafter referred to as a cooling operation) that uses the cold heat stored in the heat storage tank 8 at night, the refrigerant gas pump 13 boosts the pressure. The low-temperature low-pressure gas refrigerant enters the heat storage heat exchanger 9 and gives heat to the heat storage medium 7, condenses itself into a liquid, and adiabatically expands by the second pressure reducing mechanism 11.
It becomes a low-temperature gas-liquid two-phase fluid and flows into the evaporator 4, where heat is taken from the surroundings to be cooled, and itself evaporates and is gasified and returns to the refrigerant gas pump again. Further, in this example, the cooling operation can be performed simultaneously with the general cooling operation by the operation of the compressor 1. That is, the operation is performed with both the compressor 1 and the refrigerant gas pump 13 operating, and the refrigerant condensed in the refrigerant circuit 6 evaporates in the evaporator 4 while the bypass circuit 10
The refrigerant condensed in the heat storage heat exchanger 9 merges with the refrigerant in the main refrigerant circuit 6 and is circulated so as to be evaporated in the evaporator 4.

The compressor 1 and the refrigerant gas pump 1 shown above
The simultaneous operation of No. 3, that is, the mixed operation of the general cooling operation and the cooling operation, effectively acts as a load reduction measure for the daytime power demand, but like the conventional example, the condenser 2 and the heat storage heat exchange are used. In the method in which the refrigerants condensed in the container 9 are combined and evaporated in the same evaporator 4, in the heat storage heat exchanger side due to fluctuations in ambient environment conditions such as indoor air temperature and outdoor air temperature and temperature changes in the heat storage medium. Due to load fluctuations, there is an imbalance in the amount of refrigerant and the amount of refrigerating machine oil on the general cooling operation side and the cooling operation side. There is a risk of directly damaging the refrigerant circuit parts, such as high pressure rise, liquid backing, and seizure of the compressor bearing due to depletion of refrigerating machine oil. Here, as a solution to the above problem,
A method of adjusting the operating capacity of the compressor or refrigerant gas pump and adjusting the flow rate ratio of the condensed refrigerant on the general cooling operation circuit side and the condensed refrigerant on the cooling operation side (bypass circuit side) can be considered. Higher cost due to complexity, higher cost in terms of control equipment and increase in control circuit transmission lines, and additional capacity adjustment mechanism (eg inverter) for compressor and refrigerant gas pump. To be forced,
Not a very effective method. Also, there is a difference in the amount of refrigerant required for each operation mode of cold storage operation / general cooling operation / cooling operation, and the amount of refrigerant required for general cooling operation and cold storage operation is small. Since the required amount of refrigerant is relatively large, most of the amount of refrigerant enclosed in the entire circuit will be excessive during cold storage operation, and a large amount will be added next time the cooling operation or the mixed operation mode of general cooling and cooling operation is entered. Since the amount of refrigerant is required, it becomes necessary to install a device for temporarily collecting and discharging the refrigerant in the circuit. However, in the conventional example, there is no portion that can cover such adjustment of the refrigerant amount, and it is difficult to actually apply the device from the viewpoint of adjusting the refrigerant amount.

[0005]

Since the conventional heat storage type air conditioner is constructed as described above, when the general cooling circuit and the cooling circuit are operated at the same time, subcooling in each circuit, Since the depressurized refrigerant merges in the evaporator, fluctuations in the amount of refrigerant and oil between the circuits (unbalanced) occur due to fluctuations in the ambient environment conditions and the load on the heat storage heat exchanger side. There was a problem that it interferes with the continuation of driving.
In addition, since there is no measure to adjust the refrigerant amount variation for each operation mode caused by the difference in the required refrigerant amount in each operation mode, the operation is disturbed especially in the cold storage operation, and the actual There was a problem that it was difficult to apply the device.

The present invention has been made to solve the above problems, and when operating the general cooling circuit and the cooling circuit at the same time or individually, the refrigerant in both circuits is overheated. There is no problem such as damage to the compressor or reduction in cooling capacity due to shortage, and it is possible to continue operation with the refrigerant amount and refrigerating machine oil amount adjusted appropriately. The purpose is to obtain a harmony device.

[0007]

In order to achieve the above object, a heat storage type air conditioner according to the present invention has a general cooling circuit driven by a compressor and a cooling circuit driven by a refrigerant pump as independent circuits. Evaporators are provided separately, and bypass circuits that enable the movement of the refrigerant between the liquid pipes and gas pipes of the respective circuits are provided. During the cold storage operation, the bypass circuits are opened, and the compressor, condenser, and first A cold storage circuit including a pressure reducing mechanism and a cold heat exchanger is formed.

Further, during the cold storage operation, a third bypass circuit that bypasses the second pressure reducing mechanism via the check valve, and a refrigerant provided on the second gas pipe side of the cooling circuit via the opening / closing device. A fourth bypass circuit that bypasses the gas pump, and opening / closing devices provided on the refrigerant inlet sides of the first and second evaporators, respectively, are provided to shut off the evaporator inlet-side opening / closing devices and to provide the first to fourth A bypass circuit is connected to form a cool storage circuit.

Further, when operating the general cooling circuit and the cooling circuit simultaneously or individually, at least one of the switching devices provided in the first and second bypass circuits at the same time when the compressor or the refrigerant pump is started. Open to move the refrigerant between the two circuits and detect the degree of supercooling on the refrigerant outlet side of the cold storage heat exchanger or the refrigerant outlet side of the condenser, or the refrigerant superheat degree of the first or second evaporator. However, a refrigerant flow rate adjusting means for closing the opening / closing device when the degree of supercooling or the degree of superheat reaches a predetermined value is provided.

Further, there is provided a fifth bypass circuit which is branched from the outlet of the condenser to bypass the first pressure reducing mechanism, and which is connected in the middle with a liquid receiver, a third pressure reducing mechanism and an opening / closing device.

Furthermore, a sixth bypass circuit is provided which is bypassed from the lower part of the accumulator provided on the inlet side of the refrigerant gas pump to the gas pipe between the first bypass circuit and the fourth bypass circuit via the switchgear. , The switchgear is to be opened for a certain period of time from the start of heat storage operation for storing cold heat in the heat storage tank.

The first and second evaporators have a common fin, and a single heat exchanger capable of obtaining heat exchange amounts for both the general cooling circuit and the cooling circuit is provided. It was done.

[0013]

In the heat storage type air conditioner according to the present invention, the evaporator is separately provided as the independent cooling circuit driven by the compressor and the cooling discharge circuit driven by the refrigerant pump. By providing a bypass circuit that connects the gas pipes and allows the refrigerant to move between the circuits, the refrigerant can be moved between the circuits only when the bypass circuit is opened. Is opened to form a cold storage circuit including a compressor, a condenser, a first pressure reducing mechanism, and a cold storage heat exchanger to store cold energy in the heat storage tank. Further, when the both cooling circuits are operated individually or simultaneously, the bypass circuit is closed and operated. Therefore, when an appropriate amount of refrigerant is secured in both circuits, the cooling capacity does not decrease or fluctuate.

Further, when the general cooling circuit and the cooling circuit are operated simultaneously or individually, the bypass circuit is opened at the start of operation to move the refrigerant between the circuits, and the amount of refrigerant in both circuits is appropriately adjusted. Since the refrigerant flow rate adjusting means is provided,
For example, when there is an excessive amount of refrigerant in the general cooling circuit, the refrigerant is moved to the cooling side through the bypass circuit, and the bypass circuit is cut off when the degree of subcooling of the cooling circuit becomes appropriate. In the opposite case, the proper amount is determined based on the degree of superheat of the general cooling circuit. For this reason, even if there is an excess or deficiency of the amount of refrigerant between both circuits, it is possible to operate so as to ensure an appropriate amount.

However, since a small amount of refrigerant is required during the cold storage operation, a receiver other than the required amount for the cold storage operation is stored by the liquid receiver provided at the condenser outlet, and is discharged during the cooling operation, so that the operation modes are different. It is possible to correct the amount of refrigerant.

Further, a refrigerating machine oil is provided with a bypass circuit which can communicate with the general cooling circuit from the lower part of the accumulator on the cooling circuit side through the gas pipe, and the oil passes through the bypass circuit for a certain period from the start of the cold storage operation. By making it movable to the side of the general cooling circuit, it is possible to avoid uneven distribution of oil between the compressor and the refrigerant gas pump.

Further, since the fins of the respective independent evaporators of the general cooling circuit and the cooling circuit are made common, a single heat exchanger capable of obtaining the heat exchange amount for both circuits is provided. When both circuits are operating at the same time, the heat transfer effect for each of them can be obtained, but when both cooling circuits operate independently, the fins on the stopped side can be used and the former A double heat transfer area is obtained, and as a result, the amount of heat exchange can be increased.

[0018]

【Example】

Example 1. Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a refrigerant piping system diagram showing an overall configuration of a heat storage type air conditioner according to a first embodiment to which the inventions of claim 1, claim 2 and claim 3 of the present invention are applied. 1 in the figure
Is a compressor, 2 is a condenser, 3 is a first pressure reducing mechanism, 4a is a first evaporator, 15 is a first accumulator, and these are sequentially connected to form a general cooling circuit 17. Cooling is performed via the first evaporator 4a.

13 is a refrigerant gas pump, 9 is a heat exchanger for cold storage, 11 is a second pressure reducing mechanism, 4b is a second evaporator, 16
Is a second accumulator, which is sequentially connected to form a cooling circuit 18, and performs cooling via the second evaporator 4b. Reference numeral 7 is a heat storage medium for storing heat via the heat storage heat exchanger 9, and 8 is a heat storage tank containing the heat storage medium 7. For example, water is used as the heat storage medium 7, and as the heat storage means in this case, most of the cold heat is stored as latent heat by ice making. Although the first evaporator 4a and the second evaporator 4b are individually independent as a refrigerant circuit, the heat exchange portion is provided either in the same air passage or in an individually independent air passage. May be.

Reference numeral 19 indicates the movement of the refrigerant by opening and closing an opening / closing device 24 interposed between the first gas pipe 17b on the inlet side of the first accumulator 15 and the second gas pipe 18b on the inlet side of the second accumulator 16. A first bypass circuit that enables 20 is a first liquid pipe 17a between the first pressure reducing mechanism 3 and the first evaporator 4a, a second pressure reducing mechanism 11 and a second evaporator 4.
Opening / closing device 25 interposed between the second liquid pipe 18a and the second liquid pipe 18a
Is a second bypass circuit that enables the movement of the refrigerant by opening and closing the refrigerant. These bypass circuits 19 and 20 serve as the main circuit during the cold storage operation, and the refrigerant between the circuits during the general cooling operation and the cooling operation. Used as a moving circuit.

Reference numeral 21 denotes a third bypass circuit for bypassing the second expansion device 11 via the check valve 23 during a cold storage operation in the heat storage tank 8 via the heat storage heat exchanger 9.
Is a fourth valve provided between the outlet of the refrigerant gas pump 13 and the inlet of the second accumulator 16 via an opening / closing device 26.
The bypass circuits 27 and 28 are switch devices provided at the inlets of the first evaporator 4a and the second evaporator 4b, respectively.

FIG. 2 is a circuit diagram showing the operation during the heat storage operation, which is mainly the operation in the midnight power time zone (broken line arrow indicates the flow direction of the refrigerant). The opening / closing devices 27 and 28 are closed and the opening / closing device 24, When 25 and 26 are opened and the compressor 1 is operated while the refrigerant gas pump 13 is stopped, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 dissipates heat in the condenser 2, condenses itself into liquid, and the first decompression mechanism. After being adiabatically expanded at 3 to become a low-temperature gas-liquid two-phase fluid, it enters the second liquid pipe 18a in the heat radiation circuit 18 through the second bypass circuit 20, and the non-return in the third bypass circuit 21. Heat exchanger 8 for heat storage via valve 23
Then, the heat storage medium 7 is deprived of heat and vaporized by itself. After that, it returns to the first gas pipe 17b of the general cooling circuit 17 again through the fourth bypass circuit 22 and the first bypass circuit 19, passes through the first accumulator 15, and finally returns to the compressor 1. By this operation, the low temperature cold heat is stored by freezing the heat storage medium 7.

After the end of the heat storage operation, when the general cooling operation, the cooling operation using heat storage, or the simultaneous operation of both are performed, the opening / closing devices 24, 25, as shown in FIG.
26 and the opening / closing devices 27 and 28 are opened, the compressor 1
And the refrigerant gas pump 13 are operated individually or simultaneously. First, when the general cooling circuit 17 is operated (the solid line arrow indicates the flow direction of the refrigerant), the refrigerant is condensed in the high-temperature and high-pressure discharged refrigerant gas condenser 2 from the compressor 1 and insulated by the first pressure reducing mechanism 3. The first evaporator 4a expands and becomes a low-temperature gas-liquid two-phase fluid.
At this point, heat is taken from the surroundings to cool it, and after it evaporates and enters the first accumulator 15, it circulates so as to return to the compressor 1. Next, when the cooling circuit 18 is operated (the one-dot chain line arrow indicates the flow direction of the refrigerant), the low-temperature low-pressure gas refrigerant boosted by the refrigerant gas pump 13 enters the heat storage heat exchanger 9 to store heat. Heat the medium 7,
It condenses and liquefies, adiabatically expands by the second decompression mechanism 11, becomes a low-temperature gas-liquid two-phase fluid, and flows into the second evaporator 4b, where it takes heat from the surroundings to cool and cool itself. Then, it gasifies, passes through the second accumulator 16, and then returns to the refrigerant gas pump 13 again. Although the above example shows the case where the refrigerant pump is used as a gas pump,
A pump may be installed in the liquid pipe at the outlet of the heat storage heat exchanger 9 and used as a refrigerant liquid pump. Further, in general, when performing both cooling operations of cooling, the refrigerating cycles are independent from each other because the bypass circuits 19 and 20 between the two circuits are cut off, and the movement of the refrigerant or the refrigerating machine oil between the two is not performed. Absent. Therefore, when the proper amount of refrigerant and amount of oil are secured in both cycles, there is no reduction or fluctuation of capacity, and no compressor trouble due to reduction of refrigerating machine oil.

As described above, the general cooling circuit driven by the compressor and the cooling circuit driven by the refrigerant pump are formed as independent circuits, so that the condenser and the heat storage heat exchanger as in the conventional example are respectively provided. Due to the method in which condensed refrigerants are combined and evaporated in the same evaporator, the amount of refrigerant and refrigerating machine oil required on the general cooling operation side and the cooling operation side are imbalanced, the capacity is reduced due to deterioration of operating conditions, and the amount of refrigerant is excessive or insufficient. High pressure rise and liquid back due to, compressor bearing seizure due to depletion of refrigerating machine oil,
The problem is solved. Further, individual cooling operations of general cooling and cooling can be arbitrarily performed.

FIG. 4 and FIG. 5 are operation diagrams showing an example of a refrigerant moving method when an excess or deficiency of the refrigerant amount in each circuit occurs during the cooling operation of general cooling / cooling. FIG. 4 shows the operation when the refrigerant in the general cooling circuit is excessive and the cooling circuit is insufficient (thick line arrow indicates the refrigerant moving direction), and the switching device 24 in the first bypass circuit 19 By opening the opening / closing device 25 in the second bypass circuit 20, the refrigerant moves to the cooling circuit side. When the degree of refrigerant supercooling of the outlet side pipe 9a of the heat storage heat exchanger 9 increases to a certain value, or the outlet side pipe 4 of the second evaporator 4b is filled with the refrigerant on the cooling circuit side.
The determination device 36 receives the detection signal of the refrigerant supercooling degree or the refrigerant superheating degree when the refrigerant superheat degree of d has decreased to a certain value, and after confirming that the refrigerant is sufficient, the opening / closing devices 24, 25 Is closed to shut off the movement of the refrigerant by closing the opening / closing device. FIG. 5 is the opposite of the former and shows the operation when the refrigerant in the general cooling circuit is insufficient and the cooling circuit is excessive (thick line arrow indicates the refrigerant moving direction), and the first bypass circuit 19 By opening the opening / closing device 24 inside and the opening / closing device 25 inside the second bypass circuit 20, the refrigerant is moved to the general cooling circuit side. The refrigerant on the general circuit side is filled with the refrigerant when the refrigerant superheat degree of the outlet side pipe 4c of the first evaporator 4a decreases to a certain value or the outlet side pipe 2 of the condenser 2.
It is judged when the degree of refrigerant supercooling of a has increased to a certain value, the determination mechanism 36 receives the detection signal of the degree of refrigerant superheat or the degree of refrigerant supercooling, and after confirming the sufficientness of the refrigerant, the switchgear 24, In response to a command to close 25, the opening / closing device is closed to block the movement of the refrigerant. By performing such adjustment of the refrigerant amount, it is possible to operate so that an appropriate amount can be secured even when there is an excess or deficiency of the refrigerant amount between both circuits. The imbalance in the amount of refrigerant gradually occurs due to fluctuations in the ambient environment conditions and the load on the heat storage heat exchanger side.However, in addition to this, at the time of startup of general cooling or cooling operation after the completion of cold storage operation, both circuits are It can be said that the amount of refrigerant is far from being appropriate. The above-mentioned adjustment operation is indispensable for correcting such imbalance.

Example 2. Example 2 of the present invention will be described below with reference to FIG.
It will be explained based on. In the figure, the same parts as those in the conventional example or the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. FIG. 6 is a refrigerant piping system diagram showing an overall configuration of a heat storage type air conditioner according to a second embodiment to which the invention of claim 4 of the present invention is applied.
In the figure, 29 is a fifth bypass circuit that branches from the outlet of the condenser 2 and bypasses the first pressure reducing mechanism 3, and a liquid receiver 30, a third pressure reducing mechanism 31, and an opening / closing device 32 are sequentially connected in the middle. Consists of

As described above, there is a slight difference in the required refrigerant amount in each operation mode of the cold storage operation / general cooling operation / cooling operation. That is, the required refrigerant amount for the general cooling operation and the cold storage operation is small, and since the required refrigerant amount for the cold discharge operation is relatively large compared to this, most of the enclosed refrigerant amount in the entire circuit becomes excessive during the cold storage operation, Next, since a large amount of refrigerant is required when entering the cooling operation mode or the simultaneous operation mode of general cooling and cooling operation, it is necessary to install equipment that temporarily collects and discharges the refrigerant in the circuit. Will occur. The present embodiment shows the case where a liquid receiver for collecting the condensate is used as the refrigerant recovery device, and it is possible to meet the above requirements. During the cold storage operation, the opening / closing device 32 is closed, the liquid receiver is filled with liquid, and the liquid refrigerant is sent to the first pressure reducing mechanism 3 for adiabatic expansion. At this time, the amount of refrigerant obtained by subtracting the required amount of cold storage operation from the amount of refrigerant in all circuits is stored in the liquid receiver 30. Next, at the time of general cooling and heat radiation operation, the opening / closing device 32
Is opened, the liquid receiver 30 is emptied, and the liquid refrigerant is sent to the third pressure reducing mechanism 31 for adiabatic expansion. At this time, it is necessary to adjust the amount of refrigerant in both circuits, but since the liquid receiver 30 is installed on the high pressure side of the general cooling circuit, it is easy to move the refrigerant from the general cooling circuit to the cooling circuit. The amount of refrigerant in each refrigerant circuit is adjusted to an appropriate amount by the refrigerant amount adjusting means using the first and second bypass circuits shown in the first embodiment.

Example 3. Example 3 of the present invention will be described below with reference to FIG.
It will be explained based on. In the figure, the same parts as those in the conventional example or the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. FIG. 7 is a refrigerant piping system diagram showing an overall configuration of a heat storage type air conditioner according to a third embodiment to which the invention of claim 5 of the present invention is applied (thick line arrows indicate the flow direction of the refrigerating machine oil). 33 in the figure
From the lower part of the second accumulator 16 through the opening / closing device 34 to the first bypass circuit 19 and the fourth bypass circuit 2
The sixth bypass circuit bypasses the second gas pipe 18b between the two, and the opening / closing device 34 is opened for a certain period from the start of the cold storage operation of storing cold heat in the heat storage tank 8. This is because the refrigerating machine oil generally tends to be unevenly distributed in the heat storage heat exchanger 9 having a large heat transfer area on the cooling circuit side during the cooling operation, so that the oil accumulated in the second accumulator 16 during the cooling operation is generally used. Because it needs to be returned to the cooling circuit side,
According to the third embodiment, it is possible to prevent the oil from being biased between the compressor and the refrigerant gas pump, particularly on the gas pump side.

Example 4. The fourth embodiment of the present invention will be described below with reference to FIGS. FIG. 8 is a schematic diagram showing a configuration of an evaporator of a heat storage type air conditioner according to a fourth embodiment to which the invention of claim 6 of the present invention is applied, and 35 is a circuit 17 for general cooling and a circuit 18 for cooling air. The fins are common to both circuits, and the whole is the general circuit 17 and the cooling circuit 1
8 shows a single heat exchanger capable of obtaining heat exchange amounts for both circuits. FIG. 9 shows a form of the heat exchanger in which the evaporators of the individual circuits shown in the first embodiment are independent. When both the general cooling circuit 17 and the cooling circuit 18 are operating at the same time, there is no difference in heat exchange amount between them.
When each operates independently, using a common fin as shown in FIG. 8, a double heat transfer area is obtained including the fin on the side where operation is stopped, and as a result, heat exchange during independent operation is achieved. The amount can be increased.

[0030]

As described above, in the heat storage type air conditioner of the present invention, the evaporator is separately provided as the independent cooling circuit driven by the compressor and the cooling circuit driven by the refrigerant pump. By configuring the bypass circuits that enable the movement of the refrigerant between the liquid pipes and the gas pipes of the respective circuits, respectively, the general cooling circuit and the cooling air circuit are operated individually or simultaneously while being cut off from each other. When the proper amount of refrigerant is secured in both circuits,
There is no problem such as a decrease in the cooling capacity of each of them or unevenness of the refrigerating machine oil, and the operation can be continued in a stable state, and there is an effect that a highly reliable air conditioner is obtained. And
Since there is no need to provide a compressor or a refrigerant pump capacity adjusting device for adjusting the refrigerant flow rate ratio between the general cooling circuit side and the cooling circuit side according to the load fluctuation, there is an effect that the device can be made inexpensive. In addition, even if there is a gas leak or other trouble in either the general cooling operation side or the cooling operation side, simple cooling operation using the other cooling circuit is possible, so quality in the market is improved. The improvement is seen.

Further, when the general cooling circuit and the cooling circuit are operated simultaneously or individually, the bypass circuit is opened at the start of the operation to move the refrigerant between the circuits, and the amount of refrigerant in both circuits is appropriately adjusted. Since it uses the refrigerant flow rate control means,
Even if there is an excess or deficiency of the amount of refrigerant between both circuits, there is an effect that the operation can be performed so that an appropriate amount is secured.

Further, in order to cope with changes in the required refrigerant amount in each operation mode, a liquid receiver is provided at the condenser outlet as a device for temporarily collecting and discharging the refrigerant. This makes it possible to correct the amount of refrigerant between the operation modes, which is a very effective means in actual commercialization.

As a measure against the fluctuation of the amount of oil in the refrigerant circuit, the oil passes from the lower part of the accumulator on the side of the cooling circuit through the gas pipe,
By providing a bypass circuit that can communicate with the general cooling circuit, and allowing the oil to move from the cooling side to the general cooling circuit side through the bypass circuit for a certain period from the start of the cold storage operation, between the compressor and the refrigerant gas pump. It is possible to eliminate the bias of oil and avoid troubles such as burnout of the compressor bearing due to oil depletion.

Further, by making the fins of the respective independent evaporators of the general cooling circuit and the cooling circuit common,
Even when both cooling circuits operate independently, the heat exchange amount can be increased by utilizing the fins on the side that is not operating, and a highly useful heat exchanger can be obtained.

[Brief description of drawings]

FIG. 1 is a refrigerant piping system diagram of a heat storage type air conditioner according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing an operation during a cold storage operation of the heat storage type air conditioner according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram showing the operation of the heat storage type air conditioner according to the first embodiment of the present invention during general cooling / cooling operation.

FIG. 4 is an operation diagram showing a method of moving a refrigerant of the heat storage type air conditioner according to the first embodiment of the present invention.

[Fig. 5] Fig. 5 is an operation diagram showing a method of moving the refrigerant in the heat storage type air conditioner according to the first embodiment of the present invention.

FIG. 6 is a refrigerant piping system diagram of a heat storage type air conditioner showing a second embodiment of the present invention.

FIG. 7 is a refrigerant piping system diagram of a heat storage type air conditioner showing a third embodiment of the present invention.

FIG. 8 is a schematic diagram showing a configuration of an evaporator of a heat storage type air conditioner according to a fourth embodiment of the present invention.

FIG. 9 is a schematic diagram showing a configuration of an evaporator of a heat storage type air conditioner according to a fourth embodiment of the present invention.

FIG. 10 is a refrigerant piping system diagram of a conventional heat storage type air conditioner.

[Explanation of symbols]

 1 Compressor 2 Condenser 2a Refrigerant outlet side piping of condenser 3 1st pressure reduction mechanism 4 Evaporator 4a 1st evaporator 4b 2nd evaporator 4c 1st evaporator outlet side piping 4d 2nd evaporator Outlet side pipe 7 Heat storage medium 8 Heat storage tank 9 Heat storage heat exchanger 9a Refrigerant outlet side pipe of heat storage heat exchanger 11 Second pressure reducing mechanism 13 Refrigerant pump 15 First accumulator 16 Second accumulator 17 General cooling circuit 17a 1st liquid pipe 17b 1st gas pipe 18 Cooling circuit 18a 2nd liquid pipe 18b 2nd gas pipe 19 1st bypass circuit 20 2nd bypass circuit 21 3rd bypass circuit 22 4th Bypass circuit 23 Check valve 24, 25, 26, 27, 28 Switchgear 29 Fifth bypass circuit 30 Liquid receiver 31 Third decompression mechanism 32 Switchgear 33 Sixth bypass circuit 34 Closing device 35 fin 36 determines mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroaki Hama, 6-5-66, Tehira, Wakayama City, Wakayama Plant, Mitsubishi Electric Co., Ltd. (72) Moriya Miyamoto, 6-66, Tehira, Wakayama Mitsubishi (72) Inventor Hiroshi Nakata 6-5-66 Tehira, Wakayama City Mitsubishi Electric Co., Ltd. Wakayama Factory

Claims (6)

[Claims] 1. A general cooling circuit comprising a compressor, a condenser, a first pressure reducing mechanism, and a first evaporator, which are connected in sequence, and performs cooling through the first evaporator, and a refrigerant pump. A heat storage heat exchanger, a second pressure reducing mechanism, and a second evaporator, which are connected in sequence, and a cooling circuit for cooling through the second evaporator, and the heat storage heat exchanger A heat storage tank containing a heat storage medium for storing heat via a heat storage tank, and the first cooling circuit side first
A first bypass circuit, which is provided with an opening / closing device between the second gas pipe on the side of the cooling circuit and the second gas pipe on the cooling circuit side, and allows the refrigerant to move by opening / closing the opening / closing device; and a first pressure reducing mechanism. And the first
An opening / closing device is provided between the first liquid pipe between the evaporators and the second liquid pressure pipe between the second pressure reducing mechanism and the second evaporator, and the refrigerant can be moved by opening / closing the opening / closing device. And a second bypass circuit for controlling the general cooling circuit and the cooling circuit that performs cooling operation by using the cooling energy stored in the heat storage tank when operating the cooling circuit. The switchgear provided in the bypass circuit is shut off to operate each cooling circuit independently, and during the cool storage operation in the heat storage tank, each switchgear of the first and second bypass circuits is opened. A heat storage type air conditioner characterized in that a cool storage circuit comprising the compressor, the condenser, the first pressure reducing mechanism, and the cool storage heat exchanger is formed. 2. A third bypass circuit that bypasses the second pressure reducing mechanism via a check valve, and a refrigerant gas pump provided on the second gas pipe side of the cooling circuit via an opening / closing device. A fourth bypass circuit and opening / closing devices provided on the refrigerant inlet sides of the first and second evaporators, respectively, are provided to shut off the evaporator inlet-side opening / closing devices and connect the first to fourth bypass circuits. The regenerator type air conditioner according to claim 1, wherein a regenerator circuit is formed. 3. When operating the general cooling circuit and the cooling circuit simultaneously or individually, at least one of the switching devices provided in the first and second bypass circuits at the same time when the compressor or the refrigerant pump is started. Open to move the refrigerant between the two circuits and detect the degree of supercooling on the refrigerant outlet side of the cold storage heat exchanger or the refrigerant outlet side of the condenser, or the refrigerant superheat degree of the first or second evaporator. The heat storage type air conditioner according to claim 1, further comprising a refrigerant flow rate adjusting means for closing the switch when the degree of supercooling or the degree of superheat reaches a predetermined value. 4. A fifth bypass circuit, which is branched from the condenser outlet to bypass the first pressure reducing mechanism, and which is connected in the middle with a liquid receiver, a third pressure reducing mechanism, and a switchgear in order. The heat storage type air conditioner according to claim 1. 5. A sixth bypass circuit is provided in which a gas pipe between the first bypass circuit and the fourth bypass circuit is bypassed from the lower part of the accumulator provided on the inlet side of the refrigerant gas pump via an opening / closing device. The heat storage type air conditioner according to claim 2, wherein the switchgear is opened for a certain period of time from the start of the heat storage operation for storing the cold heat in the heat storage tank. 6. A single heat exchanger capable of obtaining a heat exchange amount for both the general cooling circuit and the cooling circuit by making the fins of the first and second evaporators common. The heat storage type air conditioner according to claim 1, wherein