JP2757660B2 - Thermal storage type air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to daytime electric power suppression and leveling countermeasures and relates to a heat storage type air conditioner having 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 regenerative air conditioner disclosed in, for example, JP-A-2-33573. This circuit includes a compressor 1, a condenser 2, and a compressor. 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 for exchanging heat between the heat storage medium 7 and the refrigerant in the heat storage tank 8. A heat exchanger 9, a first bypass circuit 10 that allows the refrigerant to move through the liquid line 5 a and the gas line 5 b between the condenser 2 and the pressure reducing mechanism 3 via the heat storage heat exchanger 9, The second bypass line 10a of the first bypass circuit 10
, A refrigerant gas pump 13 that circulates a refrigerant for heat exchange between the heat storage medium stored in the heat storage tank 8 and the refrigerant, and a refrigerant gas pump 13, both of which have input / output terminals as described above. The first bypass circuit 10 includes a second bypass circuit 12 provided in the gas pipe 10 b of the first bypass circuit 10, and an opening / closing device 14 for controlling the flow of refrigerant into the second bypass circuit 12.

Next, the operation will be described. Each of the above devices 1
Are connected by a refrigerant pipe 5 so that refrigerant can flow therethrough, and a main refrigerant circuit 6 for applying cold heat obtained by heat exchange with outdoor air in the condenser 2 to indoor air in the evaporator 4 is configured. Have been. On the other hand, a heat storage tank 8 containing a heat storage medium 7 capable of storing heat is provided in the apparatus, and a heat storage tank 8 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, adiabatically expanded in the first decompression mechanism 3, turns into a low-temperature gas-liquid two-phase fluid, enters the evaporator 4, where heat from the surroundings is generated. To cool and cool itself,
Circulate back to. In addition, at the time of the cold storage operation in which cold heat is stored in the heat storage tank 8 using the time period during which the electric power load is small at night (hereinafter, referred to as the cold storage operation), 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, adiabatically expands in the second decompression mechanism 11, and then exchanges heat for heat storage. The heat is stored in the heat storage medium 7 in the heat storage tank 8 by being evaporated in the vessel 9. After the evaporation, it returns to the compressor 1 through the opening / closing device 14. Then, 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) using the cold stored in the heat storage tank 8 at night, the pressure is increased by the refrigerant gas pump 13. The low-temperature and low-pressure gas refrigerant enters the heat exchanger 9 for heat storage, gives heat to the heat storage medium 7, condenses and liquefies, and is adiabatically expanded by the second pressure reducing mechanism 11.
It becomes a low-temperature gas-liquid two-phase fluid and flows into the evaporator 4, where it takes heat from the surroundings to cool it, evaporates and gasifies itself, and returns to the refrigerant gas pump again. Further, in this embodiment, 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 circulates together to evaporate in the evaporator 4.

[0004] The compressor 1 and the refrigerant gas pump 1 described above
3, the combined operation of the general cooling operation and the cooling operation effectively acts as a load reduction measure against the power demand in the daytime. However, as in the conventional example, the condenser 2 and the heat exchange for heat storage are used. In the method in which the refrigerants condensed in the heat exchanger 9 are combined and evaporated in the same evaporator 4, the temperature of the heat storage heat exchanger due to fluctuations in ambient environmental conditions such as indoor air temperature and outdoor air temperature and changes in the temperature of the heat storage medium. Due to the load fluctuation, imbalance occurs in the required refrigerant amount and refrigerating machine oil amount on the general cooling operation side and the cooling operation side, and as a result, not only the capacity decrease due to the deterioration of the operation state, but also the excess and deficiency of the refrigerant amount in each circuit There is a danger of directly damaging the refrigerant circuit parts, such as high pressure rise, liquid back, and seizure of the compressor bearing due to depletion of the refrigerating machine oil. Here, as a solution to the above problem,
A method is considered in which the operating capacity of the compressor and the refrigerant gas pump is adjusted to adjust the flow rate ratio of the condensed refrigerant on the general cooling operation circuit side to the condensed refrigerant on the cooling operation side (bypass circuit side). It is becoming more complicated and requires higher costs in terms of control equipment and an increase in the number of transmission lines for control circuits, and it is necessary to add a capacity adjustment mechanism (for example, an inverter) for compressors and refrigerant gas pumps. To be forced
This is not a very effective method. In addition, there is a difference in the amount of refrigerant required for each operation mode of the cool storage operation, the general cooling operation, and the cooling operation, and the amount of refrigerant required for the general cooling operation and the cooling operation is small. Since the required refrigerant amount is relatively large, most of the enclosed refrigerant amount in the entire circuit becomes excessive during the cold storage operation, and then a large amount is required when entering the cooling operation or the hybrid operation mode of general cooling and cooling operation. Since the amount of the refrigerant is required, it is 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 amount of refrigerant, and it is difficult to actually apply the equipment from the viewpoint of adjusting the amount of refrigerant.

[0005]

Since the conventional regenerative air conditioner is configured as described above, when the general cooling circuit and the cooling circuit are operated at the same time, supercooling is performed in each circuit. Since the depressurized refrigerants are combined at the evaporator, fluctuations in the ambient environment conditions and fluctuations in the load on the heat storage heat exchanger cause fluctuations (imbalance) in the refrigerant amount and oil amount between the respective circuits, and each circuit has There is a problem that hinders the continuation of operation of the vehicle.
In addition, since no measures have been taken to adjust the amount of refrigerant in each operation mode caused by the difference in the required amount of refrigerant in each operation mode, operation has been hindered, especially during cold storage operation, and actual operation has occurred. There was a problem that application to equipment was difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and when the general cooling circuit and the cooling circuit are operated simultaneously or individually, the excess refrigerant in both circuits is required. Regenerative air with refrigerant recovery / release control and oil volume control that can continue operation with proper refrigerant and refrigerating machine oil levels without problems such as compressor damage and cooling capacity reduction due to shortage The aim is to obtain a harmony device.

[0007]

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

In the cold storage operation, a third bypass circuit for bypassing the second pressure reducing mechanism via a check valve and a refrigerant provided on the second gas pipe side of the cooling circuit via an opening / closing device. A fourth bypass circuit for bypassing the gas pump, and switching devices provided on the refrigerant inlet side of the first and second evaporators, respectively, shut off the evaporator inlet-side switching devices, and perform the first to fourth operations. A cool storage circuit is formed by connecting the bypass circuit.

When the general cooling circuit and the cooling circuit are operated 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. Is opened to move the refrigerant between the two circuits to detect the degree of supercooling at the refrigerant outlet side of the cool storage heat exchanger or the refrigerant outlet side of the condenser, or the degree of superheating of the refrigerant at the first or second evaporator. Then, there is provided 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.

In addition, a fifth bypass circuit is provided which branches off from the condenser outlet and bypasses the first pressure reducing mechanism, and on the way, connects the liquid receiver, the third pressure reducing mechanism and the switchgear in order.

Further, there is provided a sixth bypass circuit which is bypassed from a lower part of the accumulator provided on the inlet side of the refrigerant gas pump to a gas pipe between the first bypass circuit and the fourth bypass circuit via an opening / closing device. , to open a predetermined time switchgear from the time蓄cold start-storing cold storage heat in the thermal storage tank.

Further, a single heat exchanger is provided in which the fins of the first and second evaporators are shared, and a heat exchange amount for both the general cooling circuit and the cooling circuit can be obtained. It was done.

[0013]

According to the regenerative air conditioner of the present invention, a general cooling circuit driven by a compressor and a cooling circuit driven by a refrigerant pump are provided as independent circuits, and evaporators are individually provided. By providing a bypass circuit that communicates the gas pipes and allows the refrigerant to move between the two circuits, the refrigerant can be moved between the two circuits only when the bypass circuit is opened. To form a cool storage circuit including a compressor, a condenser, a first pressure reducing mechanism, and a cool storage heat exchanger to store cold energy in the heat storage tank. When both cooling circuits are operated individually or simultaneously, the bypass circuit is closed and operated. Therefore, if a proper amount of refrigerant is secured in both circuits, there is no decrease or fluctuation in cooling capacity.

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 to adjust the amount of the refrigerant in both circuits appropriately. Since the refrigerant flow control means is provided,
For example, when the refrigerant is excessive 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 supercooling of the cooling circuit becomes appropriate. In the opposite case, the appropriate amount is determined based on the degree of superheating of the general cooling circuit. For this reason, even if there is an excess or deficiency in the amount of refrigerant between the two circuits, the operation can be performed so that an appropriate amount is ensured.

However, since only a small amount of refrigerant is required during the cold storage operation, the amount of refrigerant other than that required for the cold storage operation is collected by the receiver provided at the outlet of the condenser and discharged during the cooling operation. The amount of refrigerant can be corrected.

Further, a bypass circuit is provided which allows the refrigerating machine oil to communicate with the general cooling circuit through the gas pipe from the lower part of the accumulator on the cooling circuit side, and the oil passes through the bypass circuit for a fixed time from the start of the cold storage operation. By allowing movement to the general cooling circuit side, bias of oil between the compressor and the refrigerant gas pump can be avoided.

Furthermore, since the fins of the evaporators independent of the general cooling circuit and the cooling circuit are shared, a single heat exchanger can obtain the heat exchange amount for both circuits. When both circuits are operating at the same time, the required heat transfer effect can be obtained.However, when both cooling circuits operate independently, the former fin can be used because the stopped fin can be used. The heat transfer area is twice as large, and as a result, the heat exchange amount can be increased.

[0018]

【Example】

Embodiment 1 FIG. Hereinafter, a first embodiment 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 claims 1, 2 and 3 of the present invention are applied. In the figure, 1
Is a compressor, 2 is a condenser, 3 is a first decompression 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 through the second evaporator 4b. Reference numeral 7 denotes a heat storage medium for storing cold through the heat storage heat exchanger 9, and reference numeral 8 denotes a heat storage tank containing the heat storage medium 7. The heat storage medium 7 is, for example, water. In this case, the heat storage means stores most of the cold heat as latent heat by ice making. Although the first evaporator 4a and the second evaporator 4b are individually independent as refrigerant circuits, the heat exchange part is provided in the same air passage or in an individually independent air passage. May be.

Reference numeral 19 denotes movement of the refrigerant by opening and closing a switch 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. The first bypass circuit 20 enables the first liquid pipe 17a between the first decompression mechanism 3 and the first evaporator 4a, the second decompression mechanism 11 and the second evaporator 4
b opening and closing device 25 interposed between the second liquid pipe 18a
The bypass circuits 19 and 20 serve as a main circuit during the cold storage operation, and serve as a main circuit during the cold storage operation and the refrigerant between the two 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 a check valve 23 during a cold storage operation to the heat storage tank 8 via the cold storage heat exchanger 9;
The fourth is 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 opening / closing devices provided at the entrances of the first evaporator 4a and the second evaporator 4b, respectively.

[0022] Figure 2 (shown dashed arrows the flow direction of the refrigerant) is a circuit diagram showing the operation at the time蓄cold operation consisting mainly midnight operation of power consumption period, closing the closing device 27 and 28, opening and closing device 24 , 25 and 26 are opened and the compressor 1 is operated with the refrigerant gas pump 13 stopped, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is radiated by the condenser 2, itself condensed and liquefied, and the first decompression is performed. adiabatic expanded in mechanism 3 enters into the second liquid pipe 18a in the second bypass circuit 20 through to release cold <br/> circuit 18 after a low-temperature gas-liquid two-phase fluid, the third bypass Heat exchanger 8 for heat storage via check valve 23 in circuit 21
, And takes heat from the heat storage medium 7 to evaporate itself. After that, the air 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, and returns to the compressor 1 finally through the first accumulator 15. By this operation, low-temperature cold heat is stored by freezing the heat storage medium 7 or the like.

Further, after the蓄cold end of operation, the general cooling operation or cooling operation using the heat storage utilization, or when performing the simultaneous operation of both opening and closing device 24, 25 as shown in FIG. 3,
26, and opening and closing devices 27 and 28,
And the refrigerant gas pumps 13 are operated individually or simultaneously. First, when the general cooling circuit 17 is operated (solid arrows indicate the flow direction of the refrigerant), the refrigerant is condensed by the high-temperature and high-pressure discharged refrigerant gas condenser 2 from the compressor 1 and is insulated by the first pressure reducing mechanism 3. The first evaporator 4a expands and becomes a low-temperature gas-liquid two-phase fluid.
, Where it cools by removing heat from the surroundings, evaporates and enters the first accumulator 15 and then circulates back to the compressor 1. Next, when driving the cool circuit 18 (indicating the flow direction of the refrigerant flows towards one point), low-temperature low-pressure gas refrigerant pressurized by the refrigerant gas pump 13 enters the蓄cold heat exchanger 9, Giving heat to the heat storage medium 7,
It is condensed and liquefied, adiabatically expanded by the second decompression mechanism 11, flows as a low-temperature gas-liquid two-phase fluid into the second evaporator 4b, where it takes heat from the surroundings to cool and evaporate itself. After passing through the second accumulator 16, the gas returns to the refrigerant gas pump 13 again. The above example shows the case where the refrigerant pump is used as a gas pump,
Pump may be used as the refrigerant fluid pump installed on the liquid pipe of the heat exchanger 9 the outlet for 蓄-cooling. Further, when performing both the cooling operation of the general cooling and the cooling operation, the bypass circuits 19 and 20 between the two circuits are used.
Refrigeration cycles are independent of each other, and there is no transfer of refrigerant or refrigeration oil between them. Therefore, when the appropriate refrigerant amount and oil amount are secured in both cycles, there is no decrease or fluctuation in capacity, and no compressor trouble due to a decrease in refrigerating machine oil.

As described above, since the general cooling circuit driven by the compressor and the cooling circuit driven by the refrigerant pump are independent circuits, each of the condenser and the heat storage heat exchanger as in the conventional example is provided separately. The required amount of refrigerant on the general cooling operation side and the cooling operation side and the amount of refrigerating machine oil are imbalanced by the method of condensing refrigerants and evaporating in the same evaporator. Compressor bearing seizure due to high pressure rise and liquid back due to refrigerating machine oil depletion,
Such a problem is solved. In addition, individual cooling operations of general cooling and cooling can be arbitrarily performed.

FIGS. 4 and 5 are operation diagrams showing an example of a refrigerant moving method when the amount of refrigerant in each circuit becomes excessive or insufficient during the cooling operation of the general cooling and the cooling. FIG. 4 shows the operation when the refrigerant in the general cooling circuit is excessive and the cooling circuit is insufficient (the thick arrow indicates the refrigerant movement direction), and the switching device 24 in the first bypass circuit 19 and By opening the switching device 25 in the second bypass circuit 20, the refrigerant moves to the cooling circuit side. Outlet pipe of the cooling circuit side time or fulfillment of the refrigerant is increased to a constant value in the refrigerant subcooling degree at the outlet side pipe 9a of蓄cold heat exchanger 9 of the second evaporator 4b 4
The determination is made when the degree of superheat of the refrigerant d decreases to a certain value, and after the detection mechanism 36 receives the detection signal of the degree of supercooling of the refrigerant or the degree of superheating of the refrigerant and confirms the sufficiency of the refrigerant, the switching devices 24, 25 In response to a command to close the switch, the switching device is closed to shut off the movement of the refrigerant. FIG. 5 is the reverse of the former, and shows the operation when the refrigerant in the general cooling circuit is insufficient and the cooling circuit is excessive (thick arrow indicates the refrigerant movement direction). By opening the switchgear 24 in the inside and the switchgear 25 in the second bypass circuit 20, the refrigerant moves to the general cooling circuit side. The refrigerant on the general circuit side is filled when the degree of superheat of the refrigerant in the outlet pipe 4c of the first evaporator 4a is reduced to a certain value or when the outlet pipe 2 of the condenser 2 is discharged.
The judgment is made at the time when the refrigerant supercooling degree of a has increased to a certain value, and after the detection mechanism 36 receives the detection signal of the refrigerant superheating degree or the refrigerant subcooling degree and confirms that the refrigerant is full, the switching device 24, In response to a command to close 25, the opening and closing device is closed to shut off the movement of the refrigerant. By performing such refrigerant amount adjustment, operation can be performed such that an appropriate amount is ensured even if there is an excess or shortage of the refrigerant amount between the two circuits. Although imbalances amount of refrigerant gradually due to changes in the load of the ambient conditions and蓄cold heat exchanger side, when start-up of the cold-storage operation general cooling or cooling operation after completion of this addition, etc. between the two circuits Can be said to be far from proper. In order to correct such imbalance, the adjustment operation as described above is indispensable.

Embodiment 2 FIG. Hereinafter, Example 2 of the present invention will be described with reference to FIG.
It will be described based on FIG. In the figure, the same parts as those of the conventional example or the first embodiment are denoted by the same reference numerals, and the description is omitted. FIG. 6 is a refrigerant piping diagram showing the overall configuration of a heat storage type air conditioner according to Embodiment 2 to which the invention of claim 4 of the present invention is applied.
In the figure, reference numeral 29 denotes a fifth bypass circuit which branches off from the outlet of the condenser 2 and bypasses the first decompression mechanism 3, and sequentially connects the liquid receiver 30, the third decompression mechanism 31, and the opening / closing device 32 on the way. It is composed.

As described above, there is a slight difference in the required amount of refrigerant in each operation mode of the cold storage operation, the general cooling operation, and the cooling operation. That is, the required amount of refrigerant for the general cooling operation and the cool storage operation is small, and the required amount of the refrigerant for the cooling operation is relatively large in comparison with this. Next, when entering the cooling operation mode or the simultaneous operation mode of general cooling and cooling operation, a large amount of refrigerant is required, so it is necessary to install equipment that temporarily collects and discharges refrigerant in the circuit. Will occur. The present embodiment shows a case where a liquid receiver for storing condensed liquid is used as a refrigerant recovery device, and can cope with the above-mentioned demand. At the time of the cold storage operation, the opening / closing device 32 is closed, the liquid receiver is filled, and the liquid refrigerant is sent to the first pressure reducing mechanism 3 for adiabatic expansion. At this time, the amount of the refrigerant obtained by subtracting the required amount of the cool storage operation from the amount of the refrigerant in the entire circuit is stored in the liquid receiver 30. Then, in general cooling and releasing the cold operation, opening and closing device 32
Is opened, the liquid receiver 30 is emptied, and the liquid refrigerant is sent to the third decompression mechanism 31 for adiabatic expansion. At this time, it is necessary to adjust the amount of refrigerant in both circuits. However, since the liquid receiver 30 is provided on the high pressure side of the general cooling circuit, the refrigerant can be easily moved from the general cooling circuit to the cooling circuit. The refrigerant amount in each refrigerant circuit is adjusted to an appropriate amount by the refrigerant amount adjusting means using the first and second bypass circuits described in the first embodiment.

Embodiment 3 FIG. Hereinafter, a third embodiment of the present invention will be described with reference to FIG. In the figure, the same parts as those of the conventional example or the first embodiment are denoted by the same reference numerals, and the description is omitted. FIG. 7 is a refrigerant piping system diagram showing the entire configuration of a regenerative air conditioner according to Embodiment 3 to which the invention of claim 5 of the present invention is applied (thick line arrows indicate the flow direction of refrigerating machine oil). In the figure, reference numeral 33 denotes the second accumulator 1
6 through the switchgear 34 from the lower part to the second gas pipe 18 between the first bypass circuit 19 and the fourth bypass circuit 22.
This is a sixth bypass circuit that is bypassed to b. The opening and closing device 34 is opened for a certain period of time from the start of the cold storage operation for storing cold heat in the heat storage tank 8. This is because there is generally a tendency that the refrigerating machine oil is biased to蓄cold heat exchanger 9 having a large heat transfer area of the cooling circuit side during cold-storage operation, the oil accumulated in the second accumulator 16 during cooling operation Since it is necessary to return to the general cooling circuit side, according to the third embodiment, bias of oil between the compressor and the refrigerant gas pump, particularly toward the gas pump side can be avoided.

Embodiment 4 FIG. Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a schematic diagram showing the configuration of an evaporator of a regenerative air conditioner according to Embodiment 4 to which the invention of claim 6 of the present invention is applied. Reference numeral 35 denotes a general cooling circuit 17 and a cooling circuit 18. The fins are common to both circuits, and are entirely composed of 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 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 between the respective heat exchange amounts.
When each of them is operated independently, when the common fin as shown in FIG. 8 is used, a double heat transfer area is obtained including the fin on the side where the operation is stopped. The amount can be increased.

[0030]

As described above, in the regenerative air conditioner of the present invention, the evaporator is provided separately as a general cooling circuit driven by the compressor and a cooling circuit driven by the refrigerant pump as independent circuits. By using a configuration in which a bypass circuit is provided to enable the refrigerant to move between the liquid pipe and the gas pipe of each circuit, the general cooling circuit and the cooling circuit are operated individually or simultaneously in a state of being cut off from each other. When the appropriate refrigerant amount is secured in both circuits,
There is no problem such as a decrease in the cooling capacity of each of the refrigerators or uneven distribution of the refrigerating machine oil, the operation can be continued in a stable state, and an effect of obtaining a highly reliable air conditioner can be obtained. And
Since there is no need to provide a compressor or a refrigerant pump capacity adjusting device for adjusting the refrigerant flow 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 inexpensive. In addition, even if a gas leak or other trouble occurs in the piping on either the general cooling operation side or the cooling operation side, simple cooling operation using the other cooling circuit is also possible as soon as possible, so that the quality in the market can be improved. In terms of improvement,

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 to adjust the amount of the refrigerant in both circuits appropriately. Because the refrigerant flow control means is used,
Even if there is an excess or deficiency in the amount of refrigerant between the two circuits, there is an effect that operation can be performed so that an appropriate amount is ensured.

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

As a countermeasure against oil amount fluctuations in the refrigerant circuit, oil is supplied from the lower part of the accumulator on the cooling circuit side through a 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 of time from the start of the cold storage operation, the oil can be transferred between the compressor and the refrigerant gas pump. Oil unevenness can be eliminated, and troubles such as burnout of the compressor bearing due to oil depletion can be avoided.

Further, the fins of the independent evaporators of the general cooling circuit and the cooling circuit are commonly used, so that
Even when both cooling circuits operate independently, the amount of heat exchange can be increased by using the fin on the side of which operation is stopped, and there is an effect that a heat exchanger having a high use value can be obtained.

[Brief description of the drawings]

FIG. 1 is a refrigerant piping system diagram of a regenerative air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a circuit diagram showing the operation of the regenerative air-conditioning apparatus according to Embodiment 1 of the present invention during a cold storage operation.

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

FIG. 4 is an operation diagram illustrating a method of moving a refrigerant in the regenerative air conditioner according to the first embodiment of the present invention.

FIG. 5 is an operation diagram showing a method of moving refrigerant in the regenerative air conditioner according to Embodiment 1 of the present invention.

FIG. 6 is a refrigerant piping system diagram of a regenerative air conditioner showing Embodiment 2 of the present invention.

FIG. 7 is a refrigerant piping system diagram of a regenerative air conditioner showing Embodiment 3 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 Embodiment 4 of the present invention.

FIG. 9 is a schematic diagram illustrating a configuration of an evaporator of a regenerative air conditioner according to Embodiment 4 of the present invention.

FIG. 10 is a refrigerant piping system diagram of a conventional regenerative air conditioner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compressor, 2 condenser, 2a Refrigerant outlet piping of a condenser, 3 first decompression mechanism, 4 evaporator, 4a first evaporator, 4b second evaporator, 4c first evaporator outlet side Piping, 4d second evaporator outlet side piping, 7 heat storage medium,
8 storage tank, 9蓄cold heat exchanger, a refrigerant outlet pipe of 9a蓄cold heat exchanger, 11 a second pressure reducing mechanism, 13 a refrigerant pump, 15 a first accumulator 16 and the second accumulator, 17 generally Cooling circuit, 17a first liquid pipe, 17b first gas pipe, 18 cooling circuit, 18
a second liquid pipe, 18b second gas pipe, 19 first bypass circuit, 20 second bypass circuit, 21 third
Bypass circuit, 22 fourth bypass circuit, 23 check valve, 24, 25, 26, 27, 28 opening / closing device, 29
Fifth bypass circuit, 30 receiver, 31 third decompression mechanism, 32 switchgear, 33 sixth bypass circuit, 3
4 Switchgear, 35 fins, 36 judgment mechanism.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Hama 6-5-666 Tehira, Wakayama City Mitsubishi Electric Corporation Wakayama Works (72) Inventor Moriya Miyamoto 6-5-666 Teiwa Wakayama City Mitsubishi Electric In Wakayama Works, Ltd. (72) Inventor Hiroshi Nakata 6-66, Tehira, Wakayama City Mitsubishi Electric Wakayama Works, Ltd. (56) References JP-A-62-182538 (JP, A) JP-A-3-3 191231 (JP, A) JP-A-2-33573 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24F 5/00

Claims (6)

(57) [Claims] 1. A general cooling circuit comprising a compressor, a condenser, a first decompression mechanism, and a first evaporator, which are sequentially connected to perform 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 sequentially connected to each other, and a cooling circuit for performing cooling through the second evaporator, and the heat storage heat exchanger. A heat storage tank containing a heat storage medium for storing heat through the first cooling circuit side;
An opening / closing device provided between the gas pipe and the second gas pipe on the side of the cooling circuit, a first bypass circuit for enabling the movement of the refrigerant by opening and closing the opening / closing apparatus, and a first pressure reducing mechanism And the first
A switching device is provided between the first liquid pipe between the evaporators and the second liquid pipe between the second decompression mechanism and the second evaporator, and the opening and closing of the switching device enables the movement of the refrigerant. A second bypass circuit that performs the cooling operation by using the general cooling circuit and the cooling energy stored in the heat storage tank. The switching devices provided in the bypass circuit are both shut off to operate the individual cooling circuits independently, and at the time of the cold storage operation to the heat storage tank, the switching devices of the first and second bypass circuits are opened. A regenerative air conditioner, wherein a regenerative circuit comprising the compressor, the condenser, the first decompression mechanism, and the regenerative heat exchanger is formed. 2. A third bypass circuit for bypassing the second pressure reducing mechanism via a check valve, and a refrigerant gas pump provided on a second gas pipe side of the cooling circuit via an opening / closing device. A fourth bypass circuit, and switching devices provided on the refrigerant inlet side of the first and second evaporators, respectively, shut off the evaporator inlet-side switching devices and communicate the first to fourth bypass circuits. to thermal storage type air conditioning system as in claim 1, wherein said that the formation of the cold accumulating circuit. 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 as the activation of the compressor or the refrigerant pump. Is opened to move the refrigerant between the two circuits to detect the degree of supercooling at the refrigerant outlet side of the cool storage heat exchanger or the refrigerant outlet side of the condenser, or the degree of superheating of the refrigerant at the first or second evaporator. 2. A regenerative air conditioner according to claim 1, further comprising a refrigerant flow rate adjusting means for closing the switching device when the degree of supercooling or the degree of superheating reaches a predetermined value. 4. A fifth bypass circuit, which branches off from a condenser outlet and bypasses the first pressure reducing mechanism, and is provided with a liquid receiving device, a third pressure reducing mechanism, and an opening / closing device sequentially connected on the way. The regenerative air conditioner according to claim 1, characterized in that: 5. A sixth bypass circuit which is bypassed from a lower part of an accumulator provided on an inlet side of a refrigerant gas pump to a gas pipe between a first bypass circuit and a fourth bypass circuit via an opening / closing device. 3. The regenerative air conditioner according to claim 2, wherein the switching device is opened for a predetermined time from the start of the heat storage operation for storing the cold storage heat in the heat storage tank. 6. A single heat exchanger that can share the fins of the first and second evaporators and can obtain the heat exchange amount for both the general cooling circuit and the cooling circuit. The regenerative air conditioner according to claim 1, characterized in that: