JPS6333092Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an air conditioner equipped with a capacity control mechanism. There are air conditioners that are only for cooling or those that can perform cooling and heating operations, and there are also those that allow control of their performance. As this capacity control mechanism, one is known in which the cylinder of the compressor and the suction side of the compressor are connected through a release pipe, and a two-way valve is installed in the middle of the release pipe. For example, when trying to control the room temperature to temperature T ₁ during cooling operation, the control temperature T ₁
At a temperature ΔT higher than T ₂ (temperature lower by ΔT during heating operation), the two-way valve is opened as shown in Figure 1 (Figure 2 during heating operation), and the inside of the cylinder is Some of the compressed refrigerant gas is released and the compressor is switched to save operation. As a result, when the control temperature T ₁ is reached, the compressor operation is stopped and the two-way valve is closed, and thereafter the two-way valve is opened and closed in the same way, and the compressor save operation and stop are repeated, and the room temperature is is maintained at a predetermined temperature. However, in the past, the compressor was switched to save operation at a temperature higher than the control temperature T ₁ during cooling operation and lower during heating operation.
The drawback was that it took a long time for the room temperature to reach the desired temperature. In addition, since the two-way valve is switched when the room temperature is pulled down, a two-way valve with a large operating pressure difference is required, and the power of the two-way valve coil must be increased accordingly, reducing power consumption. It had grown and become uneconomical. This invention was made with attention to the above circumstances,
The purpose of this is to bring the room temperature to the desired temperature in a short time, and to reduce the power consumption of the control valve.
The present invention aims to provide an air conditioner that can be made smaller. Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 to 6. 1 in the figure is a compressor, and this compressor 1 has a condenser 2, a capillary tube 3,
and an evaporator 4 are connected to constitute a refrigeration cycle A. Further, the cylinder of the compressor 1 and the cut side of the compressor 1 are connected via a release pipe 5, and an electromagnetic two-way valve 6 as a control valve is installed in the middle of the release pipe 5. . This electromagnetic two-way valve 6 is of a so-called energized open type, and has an inlet 8 and an outlet 9 in its valve body 7, as shown in FIG. It has a rod 10. FIG. 5 shows the control circuit. Reference numeral 30 denotes a control unit that performs overall control of the air conditioner, and includes, for example, a microcomputer and its peripheral circuits.
2. An indoor fan motor 33M, an outdoor fan motor 34M, a compressor motor 1M, and an electromagnetic two-way valve 6 are connected. The operation section 31 is used to perform operations such as starting operation and setting control temperature. The indoor temperature detector 32 detects the indoor temperature. The indoor fan motor 33M is a drive motor for an indoor fan (not shown) that circulates indoor air to the evaporator 4. The outdoor fan motor 34M is a drive motor for an outdoor fan (not shown) that circulates outdoor air to the condenser 2. Next, the operation in the above configuration will be explained. Set the control temperature T ₁ with the operation unit 21,
And perform operation start operation. Then, the control section 20
are the detected temperature and control temperature of the indoor temperature detector 22.
_T1 is compared, and if the detected temperature is higher than the control temperature _T1 , the compressor 1 is turned on. When the compressor 1 is turned on, the discharged refrigerant is sent to the condenser 2 and liquefied. After the liquefied refrigerant flows out from the condenser 2, it is depressurized in the capillary tube 3 and flows into the evaporator 4.
The air is sent to the room where it evaporates and cools the room.
The gas refrigerant flowing out from the evaporator 4 is returned to the compressor 1.
be sucked into. As a result of this cooling operation, when the indoor temperature (sensed temperature) decreases and reaches the control temperature _T1 , the control unit 20 turns off the operation of the compressor 1. When a predetermined period of time has elapsed since the operation was turned off (when the detected temperature reaches a value slightly higher than the control temperature _T1 ), the control section 20 energizes the two-way valve 6 and turns on the compressor 1 again. When the two-way valve 6 is energized, its valve stem 10 rises against the pressing force of the spring 11, the outlet 9 is opened, and a part of the compressed gas refrigerant in the cylinder of the compressor 1 is released into the release pipe. 5 to the suction side of the compressor 1, and a save operation is performed. Then, when a predetermined period of time has elapsed (when the detected temperature reaches the control temperature T ₁ ), the control unit 20 turns off the compressor 1 and also stops energizing the two-way valve 6 .
occlusion. Thereafter, similarly, the control unit 20 opens and closes the two-way valve 6 in synchronization with turning on and off the compressor 1.
Continue cooling operation. As described above, since the operation of the compressor 1 is not stopped until the room temperature reaches the control temperature T ₁ at the start of cooling operation, the control temperature T _{1 is}
Compared to the case where the compressor 1 is switched to save operation before reaching the desired temperature, the room temperature can be brought to the desired temperature in a shorter time. In addition, since the two-way valve 6 is switched after the operation of the compressor 1 is temporarily stopped, the pressure difference between the inlet and outlet ports 8 and 9 of the valve body 7 becomes small, and the coil 12 of the two-way valve 6 is made small. can also be operated satisfactorily. Note that the operating pressure difference and power consumption of the two-way valve 6 are compared with those of the prior art as shown in the table below.

[Table] Furthermore, the present invention is not limited to the above-mentioned embodiment; as shown in FIG. The indoor heat exchanger 26 is connected, and the capillary tubes 24 and 25 are connected to the cylinder of the compressor 1 via an injection extension pipe 27.
7 and the suction side of the compressor 21 are connected to the release pipe 28
The same effect can be obtained even if the heat pump type refrigeration cycle B is connected through the release pipe 28 and a two-way valve 29 as a control valve is installed in the middle of the release pipe 28 for use during heating operation. Control in this case is as shown in FIG. As explained above, the present invention is configured to stop the operation of the compressor when the room temperature reaches the control temperature after the start of operation of the refrigeration cycle. Compared to switching to operation, the room temperature can be brought to the desired temperature in a shorter time. In addition, after the room temperature reaches the control temperature and the compressor operation is stopped, the control valve and compressor operation are synchronized and switched to save operation, which reduces the pressure difference when the control valve operates and saves power. This is advantageous in that it is economical and the control valve can be made smaller and costs can be reduced.

[Brief explanation of the drawing]

Figures 1 and 2 show conventional examples; Figure 1 is a graph showing the room temperature characteristics during cooling operation and the operating status of the compressor and two-way valve; Figure 2 is a graph showing the room temperature characteristics during heating operation. 3 to 6 show an embodiment of the present invention, FIG. 3 is a configuration diagram showing a refrigeration cycle, and FIG. FIG. 5 is a configuration diagram showing the control circuit; FIG. 6 is a graph showing the room temperature characteristics during cooling operation, the compressor, and the operating status of the two-way valve; FIGS. 7 and 8 The figures show other embodiments; Fig. 7 is a structural diagram showing a heat pump type refrigeration cycle, and Fig. 8 is a graph showing the room temperature characteristics and the operating status of the compressor and two-way valve during its operation. be. 1, 21... Compressor, A, B... Refrigeration cycle, 5, 28... Release pipe, 6, 29... Control valve (two-way valve).

Claims (1)

[Scope of utility model registration request] A refrigeration cycle equipped with a compressor, a release pipe that connects the cylinder of the compressor and the suction side of the compressor, a control valve that opens and closes this release pipe to control the refrigeration capacity, and an indoor temperature that detects the indoor temperature. a detector, means for comparing the temperature detected by the indoor temperature sensor and a control temperature during operation, means for turning on and off the compressor according to the comparison result, and means for detecting the indoor temperature at the start of operation. means for closing the control valve until the temperature detected by the indoor temperature detector reaches the control temperature; and after the temperature detected by the room temperature detector reaches the control temperature, the control valve is controlled in synchronization with turning on and off the compressor. An air conditioner characterized by comprising means for opening and closing a valve.