초록 ▼

A refrigerating circuit apparatus comprises a variable capacity compressor for compressing refrigerant, an inverter circuit for supplying a variable output frequency to the compressor, a memory for storing data representing at least two different control modes including a first mode wherein the outp

A refrigerating circuit apparatus comprises a variable capacity compressor for compressing refrigerant, an inverter circuit for supplying a variable output frequency to the compressor, a memory for storing data representing at least two different control modes including a first mode wherein the output frequency of the inverter circuit is changed at one frequency changing rate until the difference between the actual pressure value of refrigerant flowing into the compressor and a set value is minimum and a second mode wherein the output frequency of the inverter circuit is changed at a different frequency changing rate until the difference between the actual pressure value of refrigerant flowing into the compressor and the set value is minimum, a select switch for selecting either first or second mode stored in the memory and a control circuit for varying the output frequency of the inverter circuit based on the selected mode to control the rotation speed of the compressor. Thus, the refrigerating circuit apparatus may be adopted to different kinds of refrigerating apparatus, e.g., display cases or refrigerators, by selecting either first or second mode stored in the memory.

대표청구항 ▼

A refrigerating circuit apparatus comprising: variable capacity compressing means, having discharge and suction ports, for discharging refrigerant having a discharge side pressure and for drawing refrigerant having a suction side pressure lower than the discharge side pressure, the variable capacity

A refrigerating circuit apparatus comprising: variable capacity compressing means, having discharge and suction ports, for discharging refrigerant having a discharge side pressure and for drawing refrigerant having a suction side pressure lower than the discharge side pressure, the variable capacity compressing means including a compressing element and a variable rotation element for driving the compressing element; means for supplying a variable output frequency to the variable rotation element for rotating the variable rotation element; memory means for storing data defining at least two different predetermined control modes including a first mode having one rate of change of the output frequency of the supplying means and a second mode having a different rate of change of the output frequency; means for selecting one of the first and second control modes from the memory means; and control means for varying the output frequency of the supplying means in accordance with the selected mode for controlling the rotation speed of the variable rotation element.