JPS60181533A - Capacity control for air conditioner - Google Patents

Abstract

PURPOSE:To reduce input and prevent humidity increase due to the stop of operation by a method wherein the capacity of a compressor is changed to reduce humidity in a short period of time upon starting the operation with a high dehumidifying capacity and, then, the dehumidifying capacity is reduced and continuous operation is effected with a small capacity. CONSTITUTION:Upon the starting of operation, the compressor is operated in a high speed or the compressing capacity of the same is increased to operate the same in the condition having high dehumidifying capacity. Then, when a time T has elapsed or a humidity, detected by humidity detection or the like, has arrived at the humidity P in the diagram or lower, the operating speed of the compressor is reduced or the compressing capacity is decreased to reduce the dehumidifying capacity and continuous operation under that condition may be effected. According to this control, increase of humidity due to the stop of operation may be prevented while the input may be reduced by lowering the capacity of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to capacity control of an air conditioner that performs dehumidification operation.

Structure of the conventional example and its problems As shown in Fig. 1, this type of air conditioner has a compressor 1, an outdoor heat exchanger 2, a cooling throttle device 3, a bypass valve 4, and a heater. It was constructed by communicating a double-evaporator 6, a dehumidifying throttle 6, a second two-way bypass valve 7, and an evaporator 8.

That is, during cooling, the bypass valve heater/evaporator 6 is used as an evaporator for cooling. Then, the first bypass valve 4 is opened, the second bypass valve 7 is closed, and a dehumidifying operation is performed using the heater/evaporator 6 as a heater.

During this dehumidification operation, in order to reduce the input, even if continuous dehumidification operation is performed, the humidity stabilizes at a certain humidity as shown by the solid line in Figure 2, so the operation is controlled intermittently as shown by the dotted line. Intermittent operation is sometimes controlled by time, and sometimes by using a humidity detector.

However, in the case of time control, even if the humidity rises, the device remains stopped and does not operate within the set time.

Also, in the case of humidity detectors, accurate detection is difficult and increasing the accuracy would make it expensive.

Even if the humidity rises, the vehicle is not operated, resulting in an increased sense of discomfort.

OBJECTS OF THE INVENTION The present invention solves these problems and creates a comfortable living space.

Structure of the Invention The present invention varies the capacity of the compressor, lowers the humidity in a short time with a high dehumidifying capacity at the start of operation, then lowers the dehumidifying capacity and operates continuously at a small capacity to reduce input and stop the operation. This prevents humidity from rising due to

Description of examples The present invention will be explained below with reference to FIG.

As shown in FIG. 3, the compressor is operated at a high dehumidifying capacity by rotating at high speed or by increasing the compression capacity. Then, at time T or at a point where the humidity is below P as determined by humidity detection, the rotation speed of the compressor is lowered or the compression capacity is reduced to lower the dehumidifying ability, and the compressor is continuously operated in this state. This control prevents a rise in humidity due to one rotation stoppage, and also reduces the input by lowering the capacity.

In the above embodiment, the capacity is controlled in two stages, but the same effect can be achieved by continuously controlling the performance in several stages or in a stepless manner. Furthermore, even greater effects can be obtained if the indoor blower is also controlled in conjunction.

Effects of the Invention As is clear from the above explanation, the air conditioner capacity control method of the present invention changes the dehumidifying capacity, operates at a high dehumidifying capacity at the start of operation, and then continuously operates at a low capacity, This prevents humidity from rising while the system is stopped, creating a comfortable living space.

In addition, since it operates with low dehumidification capacity, input can be reduced.
This has the advantage that a conventional refrigeration cycle can be used as is simply by using a variable capacity compressor.

[Brief explanation of drawings]

Figure 1 is a refrigeration cycle diagram of a conventional air conditioner, Figure 2 is a characteristic diagram of a conventional air conditioner capacity control method, and Figure 3 is a diagram of the refrigeration cycle of a conventional air conditioner.
The figure is a characteristic diagram of the air conditioner capacity control method of the present invention. 1...Compressor, 2...Outdoor heat exchanger,
3... Throttle device for cooling, 4... Second valve for bypass, 6... Heater and evaporator, 6
... Dehumidification throttle, 7 ... Second two-way valve for bypass, 8 ... Evaporator. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Wi-

Claims (1)

[Claims] An air conditioner capable of dehumidifying operation is constructed by installing a heater and an evaporator on the indoor side, and the dehumidifying capacity is varied, and the air conditioner operates at a high capacity at the start of operation and then continuously operates at a low capacity. Capacity control method.