JPH053856U - Air conditioner - Google Patents

Abstract

(57) [Summary] [Purpose] To further simplify the refrigeration cycle and improve heating capacity. [Structure] The figure shows a refrigeration cycle. In the figure, 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant, 3 is an outdoor heat exchanger, 4 is a capillary tube, and 5 is an indoor heat exchanger 5. 6 is a solenoid valve provided in parallel with the capillary tube 4, 7 is a solenoid valve provided on the low-pressure side that connects the return outlet of the four-way valve 2 and the compressor 1, and 8 is heat storage that constitutes a parallel circuit with this solenoid valve 7. It is a device. The solenoid valve 6 is closed and the solenoid valve 7 is opened during the cooling and heating operations, and the solenoid valve 6 is opened and closed during the defrosting operation. Control to open.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a refrigeration cycle (refrigerant circuit) for an air conditioner.

[0002]

[Prior art]

  In the air conditioner, the characteristics at the start of operation, the cooling / heating capacity, and the defrosting operation are improved. Although various measures have been taken to shorten the time period, the refrigeration cycle shown in Fig. 2 is also used. one of. In this refrigeration cycle, the compressor 11, the four-way valve 12, the outdoor heat exchanger 13 , The capillary tube 14, the indoor heat exchanger 15, a heat storage device 16, a solenoid valve 17, 18 and check valves 19 and 20 are used. And in the case of this refrigeration cycle, Refrigerant gas discharged from the compressor 11 during the operation of the cell is transferred to the outdoor heat exchanger 13 by the four-way valve 12. To be condensed and liquefied. Then, after passing through the capillary tube 14, the pressure was reduced. It evaporates in the indoor heat exchanger 15, cools down, and returns to the compressor 11 via the four-way valve 12 again. It In the heating operation, the pressure is changed by switching the four-way valve 12 to the above cooling operation. The high temperature refrigerant gas discharged from the compressor 11 is sent to the indoor heat exchanger 15 to perform heating operation. It In the defrosting operation during heating, the solenoid valve 17 is opened during the heating operation, and the indoor heat exchanger is The refrigerant that is still hot from 15 is guided to the heat storage device 16 where it is stored. Defrosting of the outdoor heat exchanger 13 is promptly performed by obtaining heat. Furthermore, at the start of initial operation Temporarily opens the solenoid valves 17 and 18, and returns the discharged refrigerant directly to the compressor 11, The amount of ring is increased so that the operator can quickly get up to a proper driving condition.

[0003]

[Problems to be solved by the device]

  However, in the above refrigeration cycle, the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, a capillary tube 14, an indoor heat exchanger 15, a heat storage device 16, and a solenoid valve 17 , 18 and check valves 19, 20 are used, so a lot of connecting piping is required, and the circuit itself Due to the complexity of the assembly, the time and effort required for assembly have increased, resulting in higher costs. Therefore, The present invention provides a cheaper air conditioner that solves these problems. And is intended.

[0004]

[Means for Solving the Problems]

  The present invention has been made to solve the above problems, and includes a compressor, a four-way valve, Air that connects the outdoor heat exchanger, the capillary tube, and the indoor heat exchanger in that order In the refrigeration cycle of the air conditioner, parallel with the capillary tube between the heat exchangers. Is provided with a first solenoid valve, and the low-pressure side connecting the four-way valve and the compressor is connected to the second solenoid valve. A parallel circuit composed of a valve and a heat storage device is used, and the first electric power is used during cooling and heating operations. Just as the magnetic valve is closed and the second solenoid valve is opened, the first solenoid valve is opened during defrosting operation. Control so that the second solenoid valve is closed, and when the operation is started, the first solenoid valve is closed. Was opened temporarily.

[0005]

[Action]

  With the above configuration, parallel to the capillary tube during cooling and heating operations. Close the first solenoid valve provided and parallel the heat storage device on the low pressure side that connects the four-way valve and the compressor. It controls to open the second solenoid valve provided in the Operate and open the first solenoid valve and close the second solenoid valve during defrosting operation As a result, the high temperature refrigerant that has exited the indoor heat exchanger is directly fed to the outdoor heat exchanger. Can be sent, which can reduce the defrosting time of the outdoor heat exchanger. , The heat of the refrigerant that passed through this outdoor heat exchanger and the four-way valve was recovered by the heat storage device. It can be returned to the compressor later. Also, when starting operation, temporarily open the first solenoid valve. As a result, the start-up characteristics at the beginning of operation are improved.

[0006]

【Example】

  An embodiment of the present invention will be described below with reference to FIG. The figure shows the air conditioner refrigeration unit 1 is a compressor, 2 is a four-way valve for switching the flow of refrigerant, and 3 is a chamber Outside heat exchanger, 4 is throttle means (capillary tube), 5 is indoor heat exchanger, 6 Is a solenoid valve provided in parallel with the capillary tube 4, and 7 is a return outlet of the four-way valve 2. Solenoid valve provided on the low pressure side connecting the compressor 1, 8 constitutes a parallel circuit with this solenoid valve 7. It is a heat storage device. And, of the devices that make up these refrigeration cycles, the compressor Although not shown in the drawings, the control valve 1, the four-way valve 2, and the solenoid valves 6 and 7 are not shown. It is controlled by a computer, and the solenoid valve 6 is used during cooling and heating operations. Is closed and the solenoid valve 7 is opened. Also, during defrosting operation, the solenoid valve 6 is opened and the solenoid valve 7 is closed. Control so that the solenoid valve 6 is temporarily opened at the start of initial operation. is doing.

[0007]   Next, the cooling operation, the heating operation, the defrosting operation, and the start of the initial operation will be described. It In the cooling operation, the refrigerant discharged from the compressor 1 is subjected to outdoor heat exchange by the four-way valve 2. It is sent to the vessel 3 and condensed. Then, it is depressurized through the capillary tube 4. It evaporates in the indoor heat exchanger 5, cools down, passes through the four-way valve 2 again, and then the electromagnetic Return to compressor 1 via valve 7. At this time, the solenoid valve 6 is closed. In heating operation, In contrast to the cooling operation described above, by switching the four-way valve 2, the discharge from the compressor 1 The discharged high-temperature refrigerant gas is sent to the indoor heat exchanger 5 to perform heat dissipation and heating. So After that, the refrigerant flows through the capillary tube 4, the outdoor heat exchanger 3, the four-way valve 2, and the solenoid valve 7. After that, it returns to the compressor 1. At this time as well, the solenoid valve 6 is closed.

[0008]   In the defrosting operation, the solenoid valve 6 is opened during the heating operation, and the indoor heat exchanger 5 exits and remains high. Direct the heat-retaining refrigerant to the outdoor heat exchanger 3 to heat the outdoor heat exchanger 3. , Remove frost that is generated (condensation) on the outdoor heat exchanger 3. Furthermore, close the solenoid valve 7 Guide the refrigerant returned to the compressor 1 to the heat storage device 8, and the heat storage device 8 transfers the heat of the returned refrigerant. After collecting, it is returned to the compressor 1. At the beginning of initial operation, the solenoid valve By opening 6 temporarily, you can increase the amount of refrigerant circulation and It is designed to improve the characteristics.

[0009]

[Effect of device]

  If the refrigeration cycle as explained above is suitable for each operating condition Defrosting is possible because it is possible to create a flow of refrigerant and the heat storage device is effectively used. Short operating time and improved heating characteristics. Furthermore, the structure is simpler than the conventional one. Since there is no check valve, it is possible to provide a cheaper air conditioner.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner showing an embodiment of the present invention.

FIG. 2 is a refrigeration cycle diagram of an air conditioner showing a conventional example.

[Explanation of symbols]

1 compressor 2 four-way valve 3 Outdoor heat exchanger 4 Squeezing means (capillary tube) 5 Indoor heat exchanger 6 Solenoid valve 7 Solenoid valve 8 heat storage device

Claims (2)

[Scope of utility model registration request] 1. A refrigeration cycle of an air conditioner comprising a compressor, a four-way valve, an outdoor heat exchanger, a capillary tube, and an indoor heat exchanger, which are connected in this order, in parallel with the capillary tube between the two heat exchangers. A first solenoid valve, and a low pressure side connecting the four-way valve and the compressor is a parallel circuit composed of a second solenoid valve and a heat storage device, and the first solenoid valve is closed during cooling and heating operations, An air conditioner controlled such that the first electromagnetic valve is opened and the second electromagnetic valve is closed during the defrosting operation so that the second electromagnetic valve is opened. 2. The first unit at the start of operation of the air conditioner
The air conditioner according to claim 1, wherein the solenoid valve is opened temporarily.