JPS6032090B2 - air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the efficiency and rise time of an air conditioner using a rotary compressor and a pressure reducer such as a capillary tube or an expansion valve.

Conventionally, in air conditioners that use a pressure reducer such as a capillary tube or an expansion valve, when the compressor is stopped, the high temperature and high pressure cold soot liquid condensed from the condenser passes through the bleed port of the capillary tube or expansion valve and becomes low pressure. It accumulates in the evaporator, mixes with the low temperature refrigerant in the evaporator, and causes heat loss.

In addition, the soot liquid accumulated in the evaporator returns to the compressor at the same time as the compressor starts, causing a liquid backlog that causes compressor failure, accumulator capacity increase, liquid compression to increase input, and condensation again. The rise time was long because the liner liquid was not used for cooling. Furthermore, since the evaporator fan is generally operated regardless of whether the compressor is started or stopped, the condensate adhering to the evaporator evaporates again, resulting in a disadvantage that the humidity cannot be lowered much. This invention was made in view of the above-mentioned drawbacks, and in an air conditioner using a rotary compressor, a valve is provided in the pipe line from the condenser outlet side to the evaporator inlet side, which closes when the compressor is stopped and opens when the compressor is started. In addition, the evaporator side fan can be used to start the compressor.
Drive and stop with a time delay from the stop,
Furthermore, a check valve is provided between the compressor and the condenser.

The details of this invention will be explained below based on the illustrated embodiments.

The figure shows the configuration of the embodiment. In the figure, 1 is a rotary compressor, and the refrigerant compressed to high temperature and high pressure by the compressor 1 passes through the check valve 7 and flows into the condenser 2. It condenses to become a high temperature and high pressure liquid, and this high temperature and high pressure liquid refrigerant passes through the electromagnetic valve 8, becomes low temperature and low pressure in the capillary tube 3, flows into the evaporator 4, and evaporates.

The evaporated refrigerant gas passes through an accumulator (not shown) and returns to the compressor 1 again forming a cold soot circuit. 5 is a fan for the condenser 2, and 6 is a fan for the evaporator 4.

The electromagnetic valve 8 is provided with a relay in the motor circuit of the compressor 1, and is controlled to operate in conjunction with driving and stopping of the motor, so that it is connected when the compressor 1 is started and closed when it is stopped. Reference numeral 9 is a controller for the fan 6 for the evaporator 4, which uses a built-in timer that is linked to the drive and stop of the motor by the relay in the motor section of the compressor 1, so that when the compressor 1 is stopped, the air continues to be blown for a fixed period of about 1 minute. This is a controller that performs control so that when the compressor 1 is stopped and started, air blowing is started with a slight delay of about several seconds.

In the air conditioner according to the present invention configured as described above, the solenoid valve 8 is provided on the inlet side of the capillary tube 3, and the compressor 1
When the evaporator is stopped, it is closed, so the high temperature and high pressure refrigerant liquid condensed in the condenser 2 flows through the capillary tube 3 to the low pressure evaporator 4 side, and does not accumulate in the evaporator 4. Heat loss due to mixing of the condensed high-temperature liquid cold soot with the lining medium in the evaporator 4 does not occur.

In addition, when the solenoid valve 8 closes, the evaporator 4 maintains a low pressure when it is restarted, and when the evaporator 4 is restarted, the pressure becomes even lower due to the pull-in caused by the drive of the compressor 1. The medium is evaporated by heat exchange in the evaporator 4, and the evaporated cold soot gas is sucked into the compressor 1, so there is no liquid back, no input increase due to liquid compression, and steady air conditioning is quickly achieved. will be done. Furthermore, since a check valve 7 is provided on the discharge side of the compressor 1, when the compressor 1 is stopped, the high-pressure gas on the discharge side passes through the gaps between the valves and pistons of the compressor 1, and the low pressure on the suction side of the compressor 1. Even if it flows into the chamber and balances in a low pressure state, the high pressure side of the condenser etc. will not become low pressure. In particular, in the case of a rotor IJ-type compressor, the leakage of high-pressure refrigerant gas is larger than that of a rotor-type compressor.
The time required for the discharge side and suction side to reach the same low pressure is quick.
Therefore, in the case of a rotary compressor, the discharge side is balanced at the same low pressure as the suction side, so there is no pressure difference and the compressor 1 can be started smoothly. Then, the evaporator side fan 6 detects the start and stop of the compressor 1 and uses a built-in timer in the controller 9 to blow air with a delay of several seconds when the compressor 1 starts, so that the evaporator is completely turned off. The pressure can be brought to a low level quickly, and since the compressor 1 is controlled to stop blowing air for about 1 minute when it is stopped, the condensate that adheres to the evaporator 4 while the compressor 1 is operating is compressed. When the machine 1 is stopped, the evaporator side fan 6 blows air to prevent evaporation. Therefore, the humidity of the indoor air in which the evaporator 4 is installed can be kept lower than in the past. Furthermore, in the above embodiment, the solenoid valve 8 was provided between the outlet side of the condenser 2 and the inlet side of the capillary tube 3.
A similar effect can be obtained by providing the pipe between the outlet side and the evaporator 4 inlet side.

Further, in the above embodiment, the solenoid valve 8 and the fan 6 for the evaporator 4 are controlled by detecting the start and stop of the compressor 1. It is also possible to use a signal from a room temperature detector 9 to control the on/off of the machine 1. Further, in the above embodiment, a solenoid valve is used as the valve for opening and closing the soot circuit, but even if an electric valve is used, exactly the same effect can be obtained. Furthermore, in the above embodiment, the solenoid valve at the time of starting the compressor has been described, but the same effect can be obtained by providing a slight time delay after starting the compressor. As explained above, according to the present invention, a valve that opens when the compressor starts and closes when it stops is installed in the pipe line from the condenser outlet side to the evaporator inlet side of an air conditioner using a rotary compressor. A check valve is installed between the machine discharge side and the condenser, and the evaporator fan is started and stopped with a time delay after the start and stop of the compressor, so when the compressor stops, The high-pressure side and low-pressure side of the refrigerant circuit remain separate and do not mix, and the compressor's discharge and suction sides pass through gaps between the compressor's valves and pistons, and are balanced at low pressure, resulting in improved compression. The machine can be restarted smoothly, the pressure can be balanced quickly, and steady air conditioning can be achieved. Compressor failure and input increase due to liquid back can be prevented, and the accumulator can be made smaller. Since the evaporator fan is started and stopped with a time delay compared to the start and stop of the evaporator fan, it is possible to increase the amount of dehumidification and use heat effectively, which is effective in reducing equipment costs, reliability, energy saving, comfort, etc. be.

[Brief explanation of the drawing]

The figure shows a cooling circuit showing one embodiment of the present invention.

Claims (1)

[Claims] 1. In an air conditioner that forms a circuit in which refrigerant returns to the rotary compressor through a rotary compressor, a condenser, a pressure reducer, an evaporator, and an accumulator, from the condenser outlet side to the evaporator inlet side. A valve provided in a pipe line leading to the rotary compressor and opened when the rotary compressor is started and closed when stopped; a check valve provided in a pipe line connecting the rotary compressor and the condenser; An air conditioner comprising: a controller that drives and stops the fan of the rotary compressor with a time delay, respectively, than the start and stop of the rotary compressor.