JP6415702B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and more particularly, to a heat pump type air conditioner including a heat storage tank.

  There is a heat pump type air conditioner equipped with a heat storage tank as described in Patent Document 1. Hereinafter, with reference to FIGS. 6 to 9, the operation of the conventional air conditioner described in Patent Document 1 will be described.

  A conventional air conditioner includes a compressor 2, a cooling / heating switching four-way valve 1, a heat storage switching, a load-side heat exchanger 7, a load-side expansion mechanism 6, an outdoor switching valve 9, an outdoor heat exchanger 8, and an accumulator. 15 is connected in an annular shape to form a medium circuit, branched from a gas pipe through which refrigerant gas flows between the four-way valve 1 and the load-side heat exchanger 8, and expanded to adjust the four-way valve 3, the heat storage tank 4, and the amount of stored heat. The valve 5 is connected and connected to the liquid side piping.

  The operation of the above-described conventional air conditioner will be described. First, heating heat storage control will be described with reference to FIG. The flow rate flowing into the load-side heat exchanger 7 is bypassed to the heat storage tank 4 to store heat in the heat storage tank 4, and a normal heating operation is performed. And the opening degree of the expansion valve 5 is adjusted, and the heat storage amount is controlled. The refrigerant that has circulated through the load-side heat exchanger 7 and the refrigerant that has circulated through the heat storage tank 4 are merged and flow into the outdoor heat exchanger 8.

  Next, heating heat dissipation control will be described with reference to FIG. The hot gas discharged from the compressor 2 is bypassed upstream of the outdoor heat exchanger 8 and defrosted. And normal heating operation is performed. Next, the heating capacity and the defrosting capacity during defrosting are adjusted by a hot gas bypass circuit in which the discharge side of the compressor 2 and the liquid side pipe of the outdoor heat exchanger 8 are connected via the switching valve 10. In addition, the refrigerant circulated through the load-side heat exchanger 7 flows into the heat storage tank 4, merges with the refrigerant exiting the outdoor heat exchanger 8 in front of the accumulator 15, and is sucked into the compressor 2.

  Next, the cooling heat storage control will be described with reference to FIG. The liquid refrigerant condensed in the outdoor heat exchanger 8 is bypassed and flows to the expansion valve 5, the opening degree of the expansion valve 5 is adjusted, and the evaporation temperature is lowered to store heat. At this time, the expansion valve 6 of the load side heat exchanger 7 is closed. Further, the refrigerant circulating in the heat storage tank 4 joins the gas refrigerant evaporated in the load side heat exchanger 7 and flows to the accumulator 15.

  Next, cooling heat radiation control will be described with reference to FIG. The refrigerant condensed in the outdoor heat exchanger 8 is bypassed in front of the closed valve 14 and further condensed in the heat storage tank 4. Further, in order to reduce the load on the outdoor heat exchanger 8, the refrigerant circulating in the heat storage tank 4 is caused to flow to the load side heat exchanger 7 to evaporate the refrigerant. The refrigerant that has circulated through the load-side heat exchanger 7 is caused to flow to the accumulator 15 as in normal cooling.

Japanese Patent Laid-Open No. 03-87576

  In the conventional air-conditioning apparatus described above, there are a method of storing cold during the cooling operation and a method of storing heat during the heating operation. Moreover, the electric power for heat storage and cold storage will be consumed excessively.

  The present invention has been made in order to solve such problems, and a first object is to provide energy of an exhaust heat unit (such as a control box and a motor winding unit constituting a compressor) in the air conditioner. In addition, heat is stored in a heat storage tank as necessary, and is supplied (radiated) to the outdoor heat exchanger during heating operation, thereby ensuring operating capacity during heating.

  The second purpose is to cool the heat storage tank in a conventional manner during cooling, and supply cold storage heat within the range that does not reach the dew point when the heat generating part becomes hot during operation. (Cooling) is to secure the cooling capacity.

In order to solve the above-described conventional problems, an air conditioner according to the present invention includes a compressor, a four-way valve, a load-side heat exchanger, a decompression device, and an outdoor heat exchanger connected by a pipe that transfers liquid refrigerant. 1 refrigerant circuit,
A bypass circuit in which a suction pipe having a first electromagnetic valve, a heat storage tank containing a heat storage agent, and a discharge pipe having a second electromagnetic valve are connected in series is provided in the pressure reducing device so that liquid refrigerant can be stored during heating operation. Connected in parallel, opens the first solenoid valve, closes the second solenoid valve to perform heating heat storage operation, closes the first solenoid valve, and opens the second solenoid valve to perform heating operation. when performing, in an air conditioner that Nessu蓄exhaust heat in the apparatus,
Providing a second refrigerant circuit connecting the heat storage tank and the heat generating part in the apparatus, circulating the refrigerant of the second refrigerant circuit using a pump ,
During the cooling operation, using the second refrigerant circuit, characterized that you configure a cooling circuit for supplying a cold storage heat of the heat storage tank to the heating unit.

  If the air conditioner in this invention is used, it can defrost without interrupting a heating operation state by supplying the refrigerant | coolant currently stored by the heat storage tank at the high temperature state at the time of heating to an outdoor heat exchanger. . On the other hand, the cooling operation state is not limited by supplying the refrigerant stored in the heat storage tank in a low temperature state to the heat generating portion during cooling.

It is a figure which shows the structure and operation | movement of heating heat storage control in embodiment of this invention. It is a flowchart which shows control of the heating heat storage control in the embodiment. It is a flowchart which shows control of the heating radiation control in the same embodiment. It is a figure which shows the structure and operation | movement of the cooling heat storage control in embodiment of this invention. It is a flowchart which shows the control of the cooling heat radiation control in the embodiment. It is a figure which shows the structure and operation | movement of the conventional heating heat storage control. It is a figure which shows the structure and operation | movement of the conventional heating radiation control. It is a figure which shows the structure and operation | movement of the conventional cooling heat storage control. It is a figure which shows the structure and operation | movement of the conventional cooling heat radiation control.

Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.
Initially, the structure of the air conditioning apparatus in this Embodiment is demonstrated using FIG. The air conditioner includes a four-way valve 1 for switching between cooling and heating, a compressor 2, a four-way valve 3 for switching heat storage, a heat storage tank 4, a heat storage amount adjusting expansion valve 5, a load side expansion valve 6, and a load side heat exchanger 7. , An outdoor heat exchanger 8, outdoor switching valves 9 and 10, heat storage switching valves 11 to 14, an accumulator 15, a heat sink 16 and a reactor 17 disposed in the control box 25.

  Next, the heating heat storage control in this Embodiment is demonstrated using FIG. In FIG. 1, the structure of the air conditioning apparatus and the flow of a refrigerant | coolant in heating thermal storage control are shown. In this Embodiment, it has 1st heating heat storage control and 2nd heating heat storage control. The refrigerant flows in the direction indicated by the arrow.

  The second heating heat storage control is a control for storing heat from the heat generating part in the unit, and is a refrigerant system (system 2) different from the first heating heat storage control (system 1). The system 2 is provided with a second refrigerant circuit that connects the heat generating unit including the heat sink 16 and the reactor 17 and the heat storage tank (tank) 4 with refrigerant piping and circulates the refrigerant using the pump 18.

  In FIG. 1, temperature sensors 21 to 24 for measuring respective temperatures are installed in a heat sink 16, a reactor 17, a compressor 2, and a heat storage tank (tank) 4. During the operation of the air conditioner, these temperature sensors are used to monitor the surface temperature (T1) of the heat sink 16, the surface temperature (T2) of the reactor 17, and the temperature of the motor winding (T3) of the compressor 2. In the following description, a case where only the temperature (T1) of the heat sink 16 is measured is described as a representative.

  The flowchart of FIG.2 and FIG.3 shows the content of the control in the heating heat storage control of this invention. As shown in FIG. 2, when the temperature T1 of the heat sink 16 exceeds the temperature Tt of the heat storage tank (tank) 4, the heat storage operation switching valve 3 is switched in the system 1, and the pump 18 starts operating in the system 2. Thus, heat is supplied (heat storage) to the heat storage tank (tank) 4. When the temperature T1 of the heat sink 16 falls below the temperature Tt of the heat storage tank (tank) 4, the heating heat storage control is terminated and the normal heating operation is resumed.

  In addition, as shown in FIG. 3, when the inlet temperature T4 of the outdoor heat exchanger 8 is lower than the temperature Tt of the heat storage tank (tank) 4, the heat storage tank (tank) is switched by switching the heat storage operation switching valve 3 in the system 1. ) Heat is supplied (dissipated) from 4 to the outdoor heat exchanger 8 side. When the inlet temperature T4 of the outdoor heat exchanger 8 exceeds the temperature Tt of the heat storage tank (tank) 4, the heating heat storage control is terminated and the normal heating operation is resumed.

  With the air conditioner configured as described above, it is possible to optimize the driving ability by heat transfer. And by suppressing the exhaust heat of a control box and a compressor motor as needed, the driving | operation capability at the time of heating can be ensured to the maximum.

  For example, during heating, supply (heat storage) from the control box 25 (heating unit) to the heat storage tank (tank) 4 is possible. During heating, the above heat storage is further supplied to the outdoor heat exchanger 8 as necessary to ensure the heating capacity.

  As heating capacity, during heating, exhaust heat in the air conditioner (heat generation of the control box 25, heat generation of the motor of the compressor 2) is stored, and heat is supplied to the outdoor heat exchanger 8 when necessary. It is possible to secure the maximum capacity. Since the heat of the control box 25 always acts as heat storage even during defrosting, the amount of heat stored in the refrigerant can be suppressed.

  As described above, it is possible to improve the operation efficiency by using unnecessary exhaust heat by transferring heat (accumulating heat and releasing heat) when necessary during heating operation. It is possible to save power by using the same model for cooling and heating when heating is strong, or by storing heat at night and using it in the daytime. Moreover, at the time of heating operation, heating operation capability is ensured by comprising the thermal radiation circuit which defrosts the frost adhering to the heat exchanger using the refrigerant circuit of the system | strain 2. FIG.

  Next, the cooling heat storage control in this Embodiment is demonstrated using FIG. FIG. 4 shows the configuration of the air-conditioning apparatus and the refrigerant flow in the cooling and heat storage control. In the present embodiment, the first cooling heat storage control and the second cooling heat storage control are provided. In FIG. 4, heat supply (cooling) to the control box is possible by using cold storage.

  The flowchart of FIG. 5 shows the contents of the control in the cooling heat storage control of the present invention. As shown in FIG. 5, when the temperature T1 of the heat sink 16 exceeds the temperature Tt of the heat storage tank (tank) 4, the heat storage operation switching valve 18 is switched in the system 1, and the pump 18 starts operating in the system 2, and the control box 25 Heat is supplied to (cooled). When T1 falls below the dew condensation temperature Tk, the pump 18 is stopped and the cooling heat storage control is terminated. When T1 exceeds Tk, the heat storage operation is continued while the dew temperature exceeds the dew condensation temperature Tk.

  With the air conditioner configured as described above, it is possible to optimize the driving ability by heat transfer. Further, by suppressing the exhaust heat of the motor of the control box 25 and the compressor 2 as necessary, it is possible to secure the maximum operating capacity during cooling.

  As the cooling capacity, it is possible to ensure the maximum cooling capacity by performing cold storage during cooling and cooling the heat generating part (control box 25, motor of the compressor 2) in the air conditioner. By interposing the heat storage tank (tank) 4, it is possible to use the heat of the refrigerant at the time of cooling, and load leveling and efficiency can be achieved, such as cold storage while controlling the efficiency of the compressor 2 to be improved. .

  As described above, it is possible to improve the operation efficiency by using unnecessary exhaust heat by transferring heat (accumulating heat and releasing heat) when necessary during cooling operation. It is possible to improve the operating efficiency and save power by cooling the heating / cooling simultaneous model when the heating is strong, cooling in the area where the fan does not rotate, and lowering the rotation speed of the fan. Moreover, at the time of air_conditionaing | cooling operation, the fall of the capability by the heat_generation | fever of a control part is suppressed by comprising the cooling circuit which supplies the cold storage heat of the said thermal storage tank with respect to a heat generating part using the refrigerant circuit of the system | strain 2, Ensure cooling operation capacity.

  In addition, since heat dissipation is improved, it is possible to reduce the size of fans and heat sinks, and to cool high-temperature components with ICs and components. Furthermore, it is possible to save power by storing heat at night and using it in the daytime.

DESCRIPTION OF SYMBOLS 1 Four-way valve 2 Compressor 3 Four-way valve 4 Heat storage tank 5 Heat storage amount adjustment expansion valve 6 Load side expansion valve 7 Load side heat exchanger 8 Outdoor heat exchanger 9, 10 Outdoor switching valve 11, 12, 13, 14 Heat storage side Switching valve 15 Accumulator 16 Heat sink 17 Reactor 18 Pump 20, 21, 22, 23, 24 Temperature sensor 25 Control box

Claims (4)

A compressor, a four-way valve, a load-side heat exchanger, a decompressor, and an outdoor heat exchanger, each having a first refrigerant circuit connected by a pipe for transferring liquid refrigerant;
A bypass circuit in which a suction pipe having a first electromagnetic valve, a heat storage tank containing a heat storage agent, and a discharge pipe having a second electromagnetic valve are connected in series is provided in the pressure reducing device so that liquid refrigerant can be stored during heating operation. Connected in parallel, opens the first solenoid valve, closes the second solenoid valve to perform heating heat storage operation, closes the first solenoid valve, and opens the second solenoid valve to perform heating operation. When performing, in an air conditioner that stores exhaust heat in the device,
Providing a second refrigerant circuit connecting the heat storage tank and the heat generating part in the apparatus, circulating the refrigerant of the second refrigerant circuit using a pump ,
During cooling operation, the second with a coolant circuit, an air conditioner which is characterized that you configure a cooling circuit for supplying a cold storage heat of the heat storage tank to the heating unit. A compressor, a four-way valve, a load-side heat exchanger, a decompressor, and an outdoor heat exchanger, each having a first refrigerant circuit connected by a pipe for transferring liquid refrigerant;
A bypass circuit in which a suction pipe having a first electromagnetic valve, a heat storage tank containing a heat storage agent, and a discharge pipe having a second electromagnetic valve are connected in series is provided in the pressure reducing device so that liquid refrigerant can be stored during heating operation. Connected in parallel, opens the first solenoid valve, closes the second solenoid valve to perform heating heat storage operation, closes the first solenoid valve, and opens the second solenoid valve to perform heating operation. When performing, in an air conditioner that stores exhaust heat in the device,
A second refrigerant circuit is provided to connect the heat storage tank and the heat generating part in the apparatus, and the pump is operated based on a comparison between the temperature of the heat generating part and the temperature of the heat storage tank, and the second refrigerant circuit An air conditioner for circulating a refrigerant. The air conditioning apparatus according to claim 2 , wherein a heat dissipation circuit that performs defrosting is configured using the second refrigerant circuit during heating operation. 3. The air conditioner according to claim 2 , wherein during the cooling operation, the second refrigerant circuit is used to constitute a cooling circuit that supplies the heat storage unit with the cold storage heat of the heat storage tank.

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