JP2000171078A - Cooler with ice heat storage tank and cooler/heater with ice heat storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cooler with an ice heat storage tank in which oil return is improved while utilizing an outdoor heat exchanger effectively by practically equalizing the cooling capacity during cooling operation and ice heat storage operation. SOLUTION: A cooler with an ice heat storage tank performing cooling operation and ice heat storage operation comprises a cooling unit coupled with a compressor, an outdoor heat exchanger, a pressure reducing unit and an indoor heat exchanger sequentially through piping, and a heat storage tank for storing a heat storage material being cooled by a heat storage heat exchanger coupled in parallel with at least the indoor heat exchanger of the cooling unit wherein a control means controls the r.p.m. of the compressor such that the cooling capacity during cooling operation is substantially equal to that during ice heat storage operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device with an ice storage tank or a cooling and heating device with an ice storage tank for utilizing heat stored in a heat storage material of a heat storage tank by supplying the heat to an indoor heat exchanger during a cooling operation. It is.

[0002]

2. Description of the Related Art A conventional cooling device with an ice storage tank performs an ice storage operation during a time period such as midnight while changing the rotation speed of the compressor in accordance with the load to store heat in a heat storage material in the storage tank. In general, the stored heat is used for air-conditioning and industrial cooling in a time period other than the time period.

Next, this conventional cooling / heating device with an ice heat storage tank will be described with reference to FIGS. As shown in these figures, a conventional cooling and heating apparatus with an ice heat storage tank includes a compressor 1 for compressing a refrigerant and an outdoor heat exchanger 3 or an indoor heat exchanger 7 for transferring the refrigerant from the compressor 1 to be described later. A four-way valve 2 that switches the flow of refrigerant between a heating operation and a cooling operation, an outdoor heat exchanger 3 that is connected to the four-way valve and that releases the heat of the refrigerant to the outside, and an outdoor heat exchanger 3 and the indoor heat exchanger 7, the high-pressure refrigerant from the heat exchangers 3 and 7 functioning as condensers is guided to the cooling and heating operation pressure reducing device 6 via the cooling and heating operation solenoid valve 5, and is led to the pressure reducing device. And a refrigerant flow path control mechanism 4 for flowing the low-pressure refrigerant decompressed in 6 to the heat exchangers 3 and 7 functioning as evaporators. The cooling / heating operation from the cooling / heating operation solenoid valve 5 to the indoor heat exchanger 7 is performed. A heat storage operation solenoid valve 8 connected in parallel with the refrigerant circuit; Use decompressor 9, regenerative heat exchanger 10, and 貯流 the heat storage material 12 is cooled by the heat storage refrigerant circuit comprising a check valve 11 for preventing the flow of refrigerant during the heating storage tank 13
It is composed of

The above-described refrigerant flow path control mechanism 4 comprises a set of two check valves connected in series, 4a and 4b, and 4c and 4d connected in parallel. The outlet pipe from the outdoor heat exchanger 3 is connected between 4a and 4b, and the inlet pipe of the indoor heat exchanger 7 is connected between 4c and 4d. The pressure reducing device 6 and the solenoid valve 5 are connected to the pipe connected to the outlet side. The arrows in the figure indicate the flow of the refrigerant, the solid line indicates the flow of the refrigerant during cooling, and the dotted line indicates the flow of the refrigerant during the heat storage operation.

The cooling / heating refrigerant circuit described above and a heat storage refrigerant circuit connected in parallel with the cooling / heating refrigerant circuit are shown in FIG.
0, the solenoid valve 5 for cooling / heating operation of the cooling / heating refrigerant circuit
Is provided on the inlet side of the indoor heat exchanger 7 and the heat storage operation solenoid valve 8 is provided on the heat storage heat exchanger 10 inlet side to eliminate the heat storage operation decompression device 9, in other words, simply store heat. The operation pressure reducing device 9 is removed, the heat storage heat exchanger 10 is connected in parallel with the indoor heat exchanger 7, and the heat storage operation is performed on each of the refrigerant inlet sides of the heat storage heat exchanger 10 and the indoor heat exchanger 7. The electromagnetic valve 8 for cooling and the electromagnetic valve for cooling / heating operation may be provided. That is, the refrigerant from the high pressure side is decompressed by the decompression device 6, and the depressurized low pressure refrigerant is caused to flow to either the indoor heat exchanger 7 or the heat storage heat exchanger 10, and then flows to the heat storage heat exchanger 10. When the heat storage material 12 in the heat storage tank 13
Any mechanism may be used as long as it has a mechanism for cooling the air.

That is, as shown in FIG. 5, the heat storage heat exchanger 10, the brine pump 15, and the brine installed inside the heat storage tank 13 are not installed inside the heat storage tank 13. A heat storage device that cools the heat storage material 12 via a brine circuit formed by the coil 16 may be used.

FIG. 11 is a control system diagram of a conventional cooling and heating device with an ice heat storage tank. As shown in FIG. 11, the control device 14 includes a compressor 1, a four-way valve 2, and a solenoid valve 5 for cooling and heating operation. , And the operation of the heat storage operation solenoid valve 8 is controlled.

Next, the operation of the conventional air conditioner with an ice heat storage tank will be described with reference to FIGS.

First, the cooling operation will be described. During the cooling operation, the control device 14 controls the four-way valve 2 based on the cooling operation signal input from the outside so that the refrigerant flows directly from the compressor 1 to the outdoor heat exchanger 3, and controls the cooling and heating operation. The valve 5 is opened, and the heat storage operation solenoid valve 8 is closed. Accordingly, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 flows through the four-way valve 2 to the outdoor heat exchanger 3, where heat exchange is performed with the outside air, and condensed and liquefied. The liquefied high-pressure refrigerant flows through the check valve 4a of the refrigerant flow path control mechanism 4 and the cooling / heating operation solenoid valve 5 and is throttled by the cooling / heating operation pressure reducing device 6, so that it becomes a low-pressure refrigerant liquid. Next, the low-pressure refrigerant liquid flows to the indoor heat exchanger 7 via the check valve 4d of the refrigerant flow path control mechanism 4 and exchanges heat with the object to be cooled passing through the indoor heat exchanger 7. Due to the heat of the object to be cooled, it evaporates to become a low-temperature low-pressure refrigerant gas, returns to the compressor 1 via the four-way valve 2, and repeats the same operation again. That is, the refrigerant repeats the flow indicated by the solid arrow in FIG.

Next, the ice heat storage operation will be described. At the time of the ice heat storage operation, the control device 14 controls the four-way valve 2 based on the ice heat storage operation switching signal input from the outside so that the refrigerant flows directly from the compressor 1 to the outdoor heat exchanger 3, and performs cooling and heating. The operation solenoid valve 5 is closed, and the heat storage operation solenoid valve 8 is opened. Accordingly, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 flows through the four-way valve 2 to the outdoor heat exchanger 3, where heat exchange is performed with the outside air, and condensed and liquefied. Next, the liquefied high-pressure refrigerant flows through the check valve 4a and the heat storage operation solenoid valve 8 of the refrigerant flow path control mechanism 4 and is throttled by the heat storage operation pressure reducing device 9, so that it becomes a low pressure refrigerant liquid. The low-pressure liquid refrigerant flows to the heat storage heat exchanger 10 installed in the heat storage tank 13 and exchanges heat with the heat storage material 12 to be cooled in the heat storage heat exchanger 10. The refrigerant gas evaporates and becomes low-temperature low-pressure refrigerant gas, and returns to the compressor 1 via the check valve 11,
The same operation is repeated again. That is, the refrigerant repeats the flow indicated by the dotted arrow in FIG. By repeating this, the heat storage tank 1
The heat storage material 12 of No. 3 is gradually cooled, and the amount of cold heat is stored in the heat storage material 12. Note that this operation is performed during the midnight power time zone (time zone from 22:00 to 8:00) when the control device 14 lowers the power rate.

Next, the heating operation will be described with reference to FIG. At the time of the heating operation, the control device 14 controls the four-way valve 2 based on the heating operation switching signal input from the outside so that the refrigerant flows directly from the compressor 1 to the indoor heat exchanger 7. The electromagnetic valve 5 is opened, and the heat storage operation electromagnetic valve 8 is closed. Accordingly, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 passes through the four-way valve 2 and passes through the indoor heat exchanger 7.
To be condensed and liquefied. Next, the liquefied high-pressure refrigerant flows through the check valve 4c of the refrigerant flow path control mechanism 4 and the cooling / heating operation solenoid valve 5 and is throttled by the cooling / heating operation decompression device 6, so that it becomes a low-pressure refrigerant liquid. The refrigerant flows to the outdoor heat exchanger 3 via the check valve 4b of the refrigerant flow path control mechanism 4. Since the low-pressure refrigerant liquid flowing to the outdoor heat exchanger 3 exchanges heat with the outside air, it evaporates and becomes low-temperature low-pressure refrigerant gas, returns to the compressor 1 via the four-way valve 2, and repeats the same operation again. . That is, the refrigerant repeats the flow indicated by the solid arrow in FIG.

The evaporating temperature during the cooling operation is about 5 ° C.
Since the evaporation temperature during the ice heat storage operation is generally operated at about −10 ° C., as shown in FIG. 13, the cooling capacity of the compressor 1 is about half or less of the cooling operation. Here, the cooling capacity will be compared between the cooling operation and the ice heat storage operation with reference to FIG. In FIG. 13, Q indicates the cooling capacity, ET indicates the evaporation temperature, Q _COMP indicates the compression function force with respect to the evaporation temperature, and Q _HEX indicates the evaporation temperature when the temperature of the object to be cooled is substantially constant. This shows the cooling capacity of the evaporator.

As shown in this figure, when the compressor speed is constant, the compression function force Q _COMP increases because the density of the refrigerant increases as the evaporation temperature ET increases. At this time (when the evaporating temperature ET is high), the evaporator capacity Q _HEX is low because the temperature difference with the object to be cooled is small. As a result, as shown in the figure, the operation is performed at a point where the compression function power and the evaporator capacity are balanced. That is, the evaporation temperature ET
Is high, the compressor is operated at the balance point P ₁ where the compression function Q _COMP and the evaporator capacity Q _HEX are equal to each other. When the evaporation temperature ET is low, the balance point P _{2 having} a low cooling capacity is used.
Will be driven. However, as described above, the outdoor heat exchanger 3 is condensed during both the cooling operation and the ice heat storage operation, although the evaporation temperature (cooling capacity) is considerably different between the cooling operation and the ice heat storage operation. The capacity (capacity) of the condenser is selected in accordance with the cooling operation capacity having a high cooling capacity. As a result, during the ice heat storage operation having a low evaporation temperature, that is, a low cooling capacity, Therefore, the outdoor heat exchanger 3 having an excessively large condensing capacity is used as a condenser.

Further, the size of the refrigerant pipe is selected based on the cooling capacity _QC1 in the cooling operation with a high cooling capacity in order to prevent the capacity from being reduced due to the pipe loss. The refrigerant speed became slow, and it was difficult for the oil to return.

[0015]

As described above,
In the conventional cooling and heating system with an ice storage tank, the condenser capacity and refrigerant pipe size of the outdoor heat exchanger are selected based on the cooling capacity during the cooling operation with a high evaporation temperature, and the ice storage operation is also performed during the cooling operation. Because the compressor is running at the rated speed
At the time of ice heat storage operation, the capacity of the condenser of the outdoor heat exchanger becomes a selection capacity more than necessary, and there is a problem that the outdoor heat exchanger is not effectively utilized.

Further, there is another problem that the speed of the refrigerant during the ice heat storage operation is reduced, and it is difficult for the oil to return.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In both the cooling operation and the ice heat storage operation, the heat can be quickly stored while effectively utilizing the outdoor heat exchanger, and the oil can be stored. It is an object of the present invention to obtain a reversible, economical and highly reliable cooling device with an ice storage tank.

It is another object of the present invention to provide an economical and reliable cooling device with an ice heat storage tank that heats quickly while effectively using an indoor heat exchanger even during a heating operation, and has a good oil return. And

[0019]

In a cooling device with an ice storage tank and a cooling and heating device with an ice storage tank according to the present invention, a compressor, an outdoor heat exchanger, a decompression device, an indoor heat exchanger, and the like are sequentially piped. And a heat storage tank for storing a heat storage material cooled by a heat storage heat exchanger connected in parallel with at least the indoor heat exchanger of the cooling device, and a cooling operation. In the cooling device with an ice heat storage tank that performs the ice heat storage operation, the control means controls the rotation speed of the compressor so that the cooling capacity during the cooling operation and the cooling capacity during the ice heat storage operation are substantially the same. Is what you do.

A cooling and heating device in which a compressor, a four-way valve, an outdoor heat exchanger, a decompression device, an indoor heat exchanger and the like are sequentially connected by piping, and connected in parallel with at least the indoor heat exchanger of the cooling and heating device A heat storage tank for storing a heat storage material cooled by the heat exchanger for heat storage, wherein the cooling means performs an operation of cooling and warming and an operation of storing ice ice. The number of revolutions of the compressor is controlled so that the cooling capacity during operation and the cooling capacity during heating operation are substantially the same.

Further, the control means controls the number of revolutions of the compressor so that the cooling capacity during the cooling operation and the cooling capacity during the ice heat storage operation become substantially the same.

Further, when the control means controls the number of revolutions of the compressor, the control means controls the number of poles of a motor of the compressor.

The control means performs the ice heat storage operation at midnight power time.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 and 4 show a refrigerant system of a cooling and heating device with an ice heat storage tank according to Embodiment 1 of the present invention. As shown in the figure, reference numeral 17 denotes a compressor for compressing a refrigerant. The compressor 17 is a pole change motor 1 having a device for increasing the number of poles of the motor.
7b. Note that other reference numerals in the refrigerant system diagram are described in the related art, and thus description thereof is omitted.
FIG. 2 is a control system diagram. In FIG. 2, reference numeral 18 denotes a control device that controls operations of the compressor 17, the four-way valve 2, the cooling / heating operation solenoid valve 5, and the heat storage operation solenoid valve 8.

Next, the driving operation will be described with reference to FIGS. First, the cooling operation will be described.
During the cooling operation, the control device 18 controls the four-way valve 2 based on the cooling operation switching signal input from the outside so that the refrigerant flows directly from the compressor 17 to the outdoor heat exchanger 3, and also controls the cooling and heating operation. The electromagnetic valve 5 is opened, and the heat storage operation electromagnetic valve 8 is closed. Therefore, the high-temperature and high-pressure refrigerant gas compressed by the compressor 17 flows to the outdoor heat exchanger 3 via the four-way valve 2 and exchanges heat with the outside air to condense and liquefy. The condensed and liquefied high-pressure refrigerant liquid flows through the check valve 4a and the cooling / heating operation solenoid valve 5 of the refrigerant flow path control mechanism 4 and is throttled by the cooling / heating operation pressure reducing device 6, so that it becomes a low-pressure refrigerant liquid.

Next, the low-pressure refrigerant liquid flows to the indoor heat exchanger 7 via the check valve 4d of the refrigerant flow path control mechanism 4 and exchanges heat with the object to be cooled. The refrigerant gas evaporates and becomes low-temperature and low-pressure refrigerant gas, returns to the compressor 17 again via the four-way valve 2, and repeats the same operation. That is, the refrigerant repeats the flow indicated by the solid arrow in FIG. At this time, the control device 18 controls the rotation speed of the compressor 17 so as to substantially match the selected capacity of the outdoor heat exchanger 3. That is, the number of poles of the pole change motor 17b is controlled by a preset number of poles (for example, 8 poles) so as to substantially match the selected capacity of the outdoor heat exchanger 3.

It should be noted that as the rotational speed of the compressor increases, the mechanical loss of the compressor increases as the compressor speed increases, and the cooling capacity with respect to power consumption decreases. In other words, it is self-evident that the coefficient of performance, which is the ratio of the cooling capacity to the work load, is reduced. Therefore, it is not possible to operate at a lower speed than the rated rotation speed (for example, to operate at 8 poles) during the cooling operation. This is important for obtaining an economical air conditioning system with an ice storage tank.

Next, the ice heat storage operation will be described. In the ice heat storage operation, the control device 18 controls the four-way valve 2 based on the ice heat storage operation switching signal input from the outside so that the refrigerant flows directly from the compressor 17 to the outdoor heat exchanger 3, and performs the cooling / heating operation. The electromagnetic valve 5 for heat storage is closed, and the electromagnetic valve 8 for heat storage operation is opened. Accordingly, the high-temperature and high-pressure refrigerant gas compressed by the compressor 17 flows to the outdoor heat exchanger 3 via the four-way valve 2,
Condensed and liquefied by heat exchange with the outside air. The condensed and liquefied high-pressure refrigerant liquid flows through the check valve 4a and the heat storage operation electromagnetic valve 8 of the refrigerant flow path control mechanism 4 and is throttled by the heat storage operation pressure reducing device 9, so that it becomes a low pressure refrigerant liquid. Next, the low-pressure refrigerant liquid flows to the heat storage heat exchanger 10 installed in the heat storage tank 13 and exchanges heat with the heat storage material 12 in the heat storage heat exchanger 10. The refrigerant gas is vaporized into low-temperature and low-pressure refrigerant gas, returns to the compressor 17 via the check valve 11, and repeats the same operation. That is, the refrigerant repeats the flow indicated by the dotted arrow in FIG. By this repetition, the heat storage material 12 of the heat storage tank 13 is gradually cooled, and the heat storage material 12 stores the amount of cold energy.

At this time, the control device 18 increases the rotation speed of the compressor 17 during the cooling operation by an amount corresponding to the decrease in the capacity of the compressor 17 caused by the difference between the evaporation temperature in the cooling operation and the evaporation temperature in the heat storage operation. Than increase. That is,
Lower the number of poles of the pole change motor 17b (for example, 8
(From a pole to a four pole, etc.), the cooling capacity is increased, that is, the cooling capacity during the cooling operation is made substantially the same, and is substantially matched with the selected capacity of the outdoor heat exchanger 3.

Next, with reference to the graph of FIG. 3, a description will be given of the case where the pole change is performed and the case where the pole change is not performed when the cooling operation is switched to the ice heat storage operation. First, when the pole is changed, that is, when the rotation speed of the compressor 17 is increased from the cooling operation by the pole number conversion of the pole change motor 17b, the refrigerant circulation amount increases, and the capacity of the compressor 17 becomes Q _COMP1.
To Q _COMP2 . When the evaporation temperature at this time is ET _2, balance in terms of P ₃ in the cooling capacity Q _C2 high cooling capacity Q _C1 than the cooling capacity conventional ice thermal storage operation in the evaporation temperature ET ₂ (when not pole-changing) Will do.

On the other hand, when no pole-changing, as shown in FIG. 3, will be operating at capacity Q _C2 of the compressor 1 of P _2, an outdoor heat exchanger which is selected in correspondence with the compression force Q _C1 The capacity of the vessel 3 and the size of the refrigerant pipe are increased. Accordingly, as described above, if the rotation speed of the compressor is increased by changing the pole to make Q _C2 close to Q _C1 , the compression capacity (cooling capacity) can be reduced by the selected capacity of the outdoor heat exchanger 3 and the refrigerant. Since it almost matches the size of the piping, the number of revolutions (capacity) is increased, so that the outdoor heat exchanger is effectively used, heat is stored quickly, and oil is returned efficiently, economically and reliably. The cooling and heating device with an ice heat storage tank having a high temperature can be obtained.

When this ice heat storage operation (operation in which the number of revolutions of the compressor is increased) is performed during the late night power hours when the power rate is low, a large amount of heat can be stored in the heat storage material at a low power rate. Therefore, an economical air-conditioning apparatus with an ice heat storage tank having a low running cost can be obtained.

Next, the heating operation will be described with reference to FIG. The controller 18 controls the four-way valve 2 based on the heating operation switching signal input from the outside so that the refrigerant flows directly from the compressor 17 to the indoor heat exchanger 7, and opens the cooling / heating operation solenoid valve 5, The heat storage operation solenoid valve 8 is closed.
Therefore, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 flows to the indoor heat exchanger 7 via the four-way valve 2 and exchanges heat with the object to be cooled, thereby condensing and liquefying. Next, the liquefied high-pressure refrigerant flows through the check valve 4c of the refrigerant flow path control mechanism 4 and the cooling / heating operation solenoid valve 5 and is throttled by the cooling / heating operation decompression device 6, so that it becomes a low-pressure refrigerant liquid. It flows to the outdoor heat exchanger 3 via the check valve 4b of the flow path control mechanism 4. Since the low-pressure refrigerant liquid flowing to the outdoor heat exchanger 3 exchanges heat with the outside air, it evaporates and becomes low-temperature low-pressure refrigerant gas, returns to the compressor 17 via the four-way valve 2, and repeats the same operation again. . That is, the refrigerant repeats the flow indicated by the solid arrow in FIG.

During the heating operation, if the outside air temperature becomes lower than a preset temperature, the temperature difference between the refrigerant temperature of the outdoor heat exchanger 3 functioning as an evaporator and the outside air temperature is determined when the outside air temperature is high. Therefore, the decompression device catches this from the outlet refrigerant temperature of the outdoor heat exchanger 3 and squeezes it to lower the evaporation temperature ET so as to increase the temperature difference. As a result, the capacity of the compressor 17 decreases as shown in FIG. For this reason, the selected capacity of the indoor heat exchanger 7 functioning as a condenser is larger than the capacity of the compressor 17, so that the indoor heat exchanger 7 is not fully utilized.

That is, for example, the indoor heat exchanger 7 which functions as a condenser in conjunction with the outdoor heat exchanger 3 (evaporator) selected assuming an evaporation temperature of 0 ° C. corresponding to an outdoor temperature of 7 ° C.
Is, -3 ° C. becomes substantially the ambient air temperature is lowered to about 10 ° C. than expected ambient temperature 7 ° C., the evaporation temperature corresponding to the ambient temperature at that time becomes -10 ° C., as shown in FIG. 3, P from P _{1 Two}
To be the ability of the compressor 1 is to decrease to about half becomes Q _C2 from Q _C1, also the indoor heat exchanger 7 will not be fully utilized. Accordingly, the control device 18 changes the pole of the motor of the compressor 17 to increase the rotation speed of the compressor 17 in accordance with the selected capacity of the indoor heat exchanger 7, thereby increasing the refrigerant circulation amount (cooling capacity). In addition, the selected capacity of the indoor heat exchanger 7 can be sufficiently utilized, and a high heating capacity can be obtained.

Next, this operation will be described in detail with reference to the graph of FIG. That is, the case where the outside air temperature falls below the predetermined temperature, the case where the pole change of the compressor motor is performed, and the case where it is not performed will be described. First, when a pole change is performed, that is, the rotation speed of the compressor 17 is changed to a pole change motor 17b.
When raised by the number of polar transformation, an increase in the amount of circulating refrigerant, the ability of the compressor 17 is to be enhanced from the Q _COMP1 to Q _COMP2. The cooling capacity in the evaporator temperature ET ₂ and the evaporation temperature at this time is ET ₂ becomes high cooling capacity Q _C1 than the cooling capacity Q _C2 when conventional heating operation.

On the other hand, when no pole-changing, as shown in FIG. 3, and thus operating at capacity Q _C2 of the compressor 1 of P _2. However, since the selected capacity and the size of the refrigerant pipe of the indoor heat exchanger 7 is selected to correspond to the compression force Q _C1, the capacity of the indoor heat exchanger 7 on the ability Q _C2 of the compressor 1 and the refrigerant The size of the piping increases. Therefore, if you change the pole so that Q _C2 becomes almost Q _C1 ,
Since the selected capacity of the indoor heat exchanger 7 and the size of the refrigerant pipe are almost matched, the number of revolutions (capacity) is increased, so that the indoor heat exchanger can be effectively used and heating can be performed quickly even when the outside air is low. In addition, it is possible to obtain an economical and highly reliable cooling and heating device with an ice heat storage tank with good oil return.

In the above description, the pole change of the electric motor of the compressor has been described as an example. However, the one in which the rotational speed of the compressor can be higher than that in the cooling operation, for example, as shown in FIG. As described above, a device provided with an inverter device may be used. That is, as long as the rotational speed of the compressor can be varied, almost the same effect can be obtained with any mechanism.

As shown in FIG. 5, instead of installing the heat storage heat exchanger 10 inside the heat storage tank 13 as in the configuration of the present embodiment, the heat storage heat exchanger 10, the brine pump 15, An apparatus for cooling the heat storage material 12 via a brine circuit formed by a brine coil 16 installed inside the heat storage tank 13 can also be controlled by the same pole change motor 17b as in the present embodiment. The same effect as in the embodiment can be obtained.

As shown in FIG. 7, the refrigerant flow control mechanism 4 is eliminated, the cooling / heating decompression device 6 and the heat storage decompression device 9 are shared, and the indoor heat exchange 7 and the heat storage heat exchanger 10 are used.
A cooling / heating operation solenoid valve 5 and a heat storage operation solenoid valve 8 are provided on each refrigerant inlet side during each cooling / heat storage operation, respectively.
The controller 18 opens the cooling / heating operation solenoid valve 5 during the cooling or heat storage operation, closes the heat storage operation solenoid valve 8, and closes the cooling / heating operation solenoid valve 5 and opens the heat storage operation solenoid 8 during the heat storage operation. You may do it. However, in this case, the shared pressure reducing device uses an electric expansion valve (LEV or the like).

Furthermore, as shown in FIG. 8, the refrigerant flow path control mechanism 4, the cooling / heating operation solenoid valve 5 and the heat storage operation solenoid valve 8 are eliminated, and the cooling / heating decompression device 6 and the heat storage decompression device 9 are removed. The electric expansion valve (LE
V), the control device 18 opens the electric expansion valve of the cooling / heating decompression device 6 during the cooling or heat storage operation, closes the electric expansion valve of the heat storage decompression device 9, and performs the cooling / heating decompression during the heat storage operation. The electric expansion valve of the device 6 may be closed, and the electric expansion valve of the heat storage pressure reducing device 9 may be opened. 7 and 8, the solid line indicates the refrigerant flow during the cooling operation, the dotted line indicates the refrigerant flow during the heat storage operation, and the dashed line indicates the refrigerant flow during heating.

In the above description, the flow of the refrigerant is switched by the four-way valve 2 to perform cooling and warming. However, as shown in FIG. 9, the heating operation is not performed without the four-way valve 2 and the cooling operation is performed. Even if the configuration is such that only the operation and the ice heat storage operation are performed, or the above-described switching from the cooling operation to the ice heat storage operation is performed, the heat is quickly stored while effectively utilizing the outdoor heat exchanger, and the oil is returned. It goes without saying that a good, economical and reliable cooling device with an ice storage tank can be obtained.

At this time, the flow of the refrigerant is in the direction of the solid line arrow in the cooling operation, and is in the direction of the dotted arrow in the ice storage operation. The control device opens the cooling / heating operation electromagnetic valve 5 and closes the heat storage operation electromagnetic valve 8 during the cooling operation, and closes the cooling / heating operation electromagnetic valve 5 and opens the heat storage operation electromagnetic valve 8 during the ice heat storage operation. Will be. In addition, 22 of this figure is the heat storage material 1 of the heat storage tank 13.
2 is a heat exchanger for exchanging heat with the refrigerant during the cooling operation.

Further, the four-way valve 2 may be removed from the refrigerant circuit diagrams shown in FIGS. 7 and 8, so that only the cooling operation and the heat storage operation may be performed.

[0045]

As described above, the present invention relates to a cooling apparatus with an ice storage tank for performing a cooling operation and an ice storage operation.
The control means controls the number of revolutions of the compressor so that the cooling capacity during the cooling operation is substantially the same as the cooling capacity during the ice heat storage operation. Even if the temperature changes, the amount of circulating refrigerant is almost the same, so that the outdoor heat exchanger functioning as a condenser is always effectively used, heat is stored quickly, and oil is returned efficiently, economically and reliably. A cooling device with a high ice storage tank is obtained.

Further, in the cooling and heating apparatus with the ice storage tank for performing the cooling / warming operation and the ice heat storage operation, the control means may make the cooling capacity during the cooling operation substantially equal to the cooling capacity during the heating operation. Since the number of rotations of the compressor is controlled, even if the evaporation temperature is changed by switching from the cooling operation to the heating operation, the refrigerant circulation amounts are substantially the same, so that the indoor heat exchanger functioning as a condenser is always effective. It is possible to obtain an economical and highly reliable cooling and heating device with an ice heat storage tank, which heats quickly while utilizing it, and has a good return of oil.

Further, in the cooling and heating apparatus with an ice storage tank for performing the cooling / warm operation and the ice storage operation, the control means may make the cooling capacity during the cooling operation substantially equal to the cooling capacity during the ice storage operation. Since the rotation speed of the compressor is controlled so that the refrigerant circulation amount is substantially the same even when the evaporation temperature is changed by switching from the cooling operation to the ice heat storage operation, the outdoor heat exchanger functioning as a condenser is provided. It is possible to obtain an economical and highly reliable cooling and heating device with an ice heat storage tank that stores heat quickly while always making effective use of it, and that has good oil return.

Further, when the control means controls the number of revolutions of the compressor, the number of poles of the motor of the compressor is controlled, so that the control can be performed with a simple structure and with high accuracy, and economical and reliable. A cooling device with an ice heat storage tank or a cooling and heating device with an ice heat storage tank having high performance can be obtained.

Further, since the control means performs the ice heat storage operation at midnight power time, it is possible to obtain a cooling device with an ice heat storage tank or a cooling and heating device with an ice heat storage tank with low running cost.

[Brief description of the drawings]

FIG. 1 is a refrigerant system diagram of a cooling and heating device with an ice heat storage tank according to a first embodiment.

FIG. 2 is a control system diagram of the cooling and heating device with an ice heat storage tank in the first embodiment.

FIG. 3 is a capacity balance diagram of a compression function power and an evaporator capacity in the first embodiment.

FIG. 4 is an explanatory diagram showing a flow of a refrigerant during heating of the cooling and heating device with an ice heat storage tank according to the first embodiment.

FIG. 5 is a refrigerant system diagram of another cooling / heating device with an ice heat storage tank according to the first embodiment.

FIG. 6 is a control system diagram of another cooling / heating device with an ice heat storage tank according to the first embodiment.

FIG. 7 is a refrigerant system diagram of another cooling / heating device with an ice heat storage tank in the first embodiment.

FIG. 8 is a refrigerant system diagram of another cooling / heating device with an ice heat storage tank in the first embodiment.

FIG. 9 is a refrigerant system diagram of the cooling device with an ice heat storage tank having no heating operation mechanism in the first embodiment.

FIG. 10 is a refrigerant system diagram of a conventional cooling / heating device with an ice heat storage tank.

FIG. 11 is a control system diagram of a conventional cooling / heating device with an ice heat storage tank.

FIG. 12 is an explanatory diagram showing a flow of a refrigerant at the time of heating of the conventional cooling and heating device with an ice heat storage tank.

FIG. 13 is a capacity balance diagram of a conventional compression function and an evaporator capacity.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compressor, 1a Refrigerant compression part, 1b Motor for compressor, 2 Four-way valve, 3 outdoor heat exchanger, 4 Refrigerant flow path control mechanism, 4a-4d check valve, 5 Solenoid valve for cooling / heating operation, 6 For cooling / heating operation Decompression device, 7 indoor heat exchanger, 8 heat storage operation solenoid valve, 9 heat storage operation pressure reduction device, 10 heat storage heat exchanger, 11 check valve, 12
Heat storage material, 13 heat storage tank, 14 control device, 15 brine pump, 16 brine coil, 17 compressor, 17a refrigerant compression section, 17b pole change motor, 18 control device.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshifumi Koyanagi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Osamu Otsuka 2-3-2 Marunouchi 3-chome, Chiyoda-ku, Tokyo F term in Ryo Electric Co., Ltd. (reference) 3L060 AA01 AA03 CC08 CC19 DD02 EE02 EE41 3L092 TA02 TA15 UA02 UA34 VA07 YA01 YA20

Claims (5)

[Claims] 1. A cooling device in which a compressor, an outdoor heat exchanger, a decompression device, an indoor heat exchanger, and the like are sequentially connected by piping, and a heat storage device connected to at least the indoor heat exchanger of the cooling device in parallel. A heat storage tank for storing a heat storage material cooled by the heat exchanger for cooling, and a cooling device with an ice heat storage tank performing a cooling operation and an ice heat storage operation, wherein the control means has a cooling capacity during the cooling operation. And controlling the number of revolutions of the compressor so that the cooling capacity during the ice heat storage operation is substantially the same as that of the ice heat storage operation. 2. A cooling and heating device in which a compressor, a four-way valve, an outdoor heat exchanger, a decompression device, an indoor heat exchanger and the like are sequentially connected by piping, and connected in parallel with at least the indoor heat exchanger of the cooling and heating device. A heat storage tank for storing a heat storage material cooled by the heat exchanger for heat storage, wherein the cooling means performs an operation of cooling and warming and an operation of storing ice ice. A cooling and heating device with an ice storage tank, wherein the number of revolutions of the compressor is controlled so that the cooling capacity during operation and the cooling capacity during heating operation are substantially the same. 3. The compressor according to claim 2, wherein the control means controls the number of revolutions of the compressor such that the cooling capacity during the cooling operation is substantially the same as the cooling capacity during the ice heat storage operation. 3. The cooling and heating device with an ice heat storage tank according to 2. 4. The method according to claim 1, wherein the control means controls the number of poles of a motor of the compressor when controlling the number of revolutions of the compressor. A cooling device with an ice storage tank or a cooling and heating device with an ice storage tank. 5. The cooling device with an ice heat storage tank or the ice heat storage tank according to claim 1, wherein the control unit performs the ice heat storage operation during a midnight power time zone. Air conditioning unit.