JPS60140052A - Method of controlling capacity of air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a capacity control method for an air conditioner that is equipped with a capacity control mechanism that controls the capacity of a compressor so that it can be operated at a capacity that corresponds to the outside temperature. It is related to.

The configuration of the conventional example and its problems The 12th
7 As shown in the figure, a compressor 1° and an evaporator 2. Pressure reducer 3. The condensers 4 are connected in an annular manner, and a capacity control bypass is provided from a capacity control intermediate port of the compressor 1 to the suction side of the compressor 1 via a solenoid valve 5.

The solenoid valve 6 is controlled by turning the switch 6 on and off manually or automatically, as shown in FIG.
This is done by controlling the energization of the solenoid valve Koi/l/61L. In other words, when the solenoid valve 5 is closed, full power operation is achieved, and the solenoid valve 6
It has been known in the past that capacity control operation is performed by opening the engine.

The following will explain the cooling operation as an example. As shown in Figure 3, when the outside temperature is low and the required capacity is small, open the solenoid valve 6,
Perform capacity control operation.

Further, when the outside temperature is high and the required capacity is high, the solenoid valve 6 is closed to perform omnipotent operation.

In this case, since there are only two operating states that can be selected by turning on and off the switch 6: omnipotent operation and capacity control operation, as shown in the shaded area in Figure 3, capacity control operation is There are many situations where the capacity is too small and the capacity is too large in omnipotent operation.

If the capacity is too large during full-power operation, the room temperature will drop too much, and a room temperature controller such as a thermostat will control the compressor 1 to stop, or to start when the room temperature rises. This causes a large change in room temperature, which can make you feel uncomfortable.

Also, if the required capacity is slightly higher than capacity control operation,
The room temperature will not drop and you will feel uncomfortable.

Comfortable air conditioning cannot be achieved by simply switching between two types of control: omnipotent operation and capacity control operation.

OBJECTS OF THE INVENTION It is an object of the present invention to compensate for the above-mentioned drawbacks and to provide comfortable air conditioning.

Structure of the Invention In order to achieve this object, the present invention includes a compressor, an evaporator, a pressure reducer, and a condenser each having a capacity control mechanism connected in a ring, and a solenoid valve connected to an intermediate port for capacity control of the compressor. In a refrigerant circuit provided with a capacity control bypass on the suction side of the compressor, the opening and closing of the solenoid valve is controlled by time using a full timer, and the time setting of this timer is changed.

DESCRIPTION OF EMBODIMENTS The present invention will be explained below with reference to FIGS. 4 and 6 showing one embodiment thereof.

Bypass solenoid valve coil lv5 for capacity control as shown in Figure 4
B, fz When the switch 6 operated is linked to a timer T which is variable in time, the capacity control bypass solenoid valve 6 opens and closes according to the time set by the timer T, making it possible to control the bypass flow rate.

Therefore, by appropriately changing the set time of the timer T, it is possible to perform a timer-controlled operation in which the capacity can be varied stepwise as shown in FIG. For example, if the opening and closing times of the solenoid valve 6 are made the same, the amount of bypass passing through the solenoid valve 6 will be the same as the amount of bypass during the capacity control operation, and the capacity will be between the omnipotent operation and the capacity control operation.

It can be made infinitely smaller by changing the time ratio of timer T in the stepwise variable capacity shown in Figure 5.

If the timer control operation is made infinitely narrow, it will match the required capacity straight line. This timer Tld can be easily implemented at low cost by using a microcomputer, which is currently used in large numbers to control air conditioners.

As another example, heat pump operation will be explained with reference to FIGS. 6 and 7. The same number is assigned to the same number as the cooling operation.

Figure 6 shows compressor 1. This figure represents a refrigerant circuit that connects a capacity control bypass solenoid valve 4 (which functions as an evaporator in heat pump operation) as shown in the figure.

The solid line indicates the entire flow of refrigerant during pump operation, and the broken line indicates the flow of refrigerant during cooling operation.

In the heat pump operation, the heating capacity is changed by interlocking the capacity control bipanu solenoid valve 6 with the time variable timer T shown in FIG. By changing the time of this timer T, step-like heating capacity control as shown in Fig. 7 can be realized, and even narrower6...

By changing the timer T, matching with the required heating capacity straight line can be realized.

Effects of the Invention As described above, in the present invention, the variable capacity allows stepless control between full-power operation and controlled operation of the compressor, so it is no longer necessary to start and stop the compressor using a room temperature controller as in the past. There is no need to repeat the process, the room temperature is always kept constant, and comfortable air conditioning can be achieved.

[Brief Description of the Drawings] Figure 1 is a refrigerant circuit diagram with a capacity control mechanism added. Fig. 2 is a schematic electric circuit diagram for controlling the capacity of a compressor showing a conventional example, and Fig. 3 is a cooling capacity curve diagram 2 using the same control method.
Fig. 4 is a schematic electric circuit diagram for controlling by a timer in one embodiment of the present invention, Fig. 6 is a cooling capacity curve diagram under the same control, and Fig. 6 is a heat pump operation showing another embodiment of the present invention. A possible refrigerant circuit diagram, FIG. 7, is a heating capacity curve diagram using the same control. 1... Compressor, 2... Evaporator, 3...
... pressure reducer, 4 ... condenser, 6 ...
View control solenoid valve, T...Evening now. Name of agent: Patent attorney Toshi Nakao and 1 other person 1 Figure 3 Butto temperature - - 7> Figure 4 Figure 5 (3) Evening temperature 3 to 3 = - Man 6 Figure 7 Tato temperature

Claims (1)

[Claims] Compressor with capacity control mechanism 1. Evaporator 2. In a refrigeration circuit in which a pressure reducer 3 and a condenser 4 are connected in an annular manner, and a capacity control bypass is provided from an intermediate boat for capacity control of the compressor 1 to the suction side of the compressor 1 via a solenoid valve 5, electric power, A capacity control method for an air conditioner, in which the opening and closing of a magnetic valve 5 is controlled by time using a timer T, and the capacity is controlled steplessly by changing the time setting of the timer T.