Variable-capacity control structure, compressor and variable-capacity control method thereof

A variable-capacity control method performed by a compressor;

• wherein the compressor comprises at least one compression cylinder assembly operating constantly, at least one variable-capacity cylinder assembly which is selectively in a working state or an idling state, and a variable-capacity control structure;
• wherein the variable-capacity control structure comprises a variable-capacity assembly and a sliding vane restraint unit;
• wherein the variable-capacity assembly is provided outside a housing of the compressor to which the variable-capacity control structure is attached and is configured to act in a setting order;
• wherein the sliding vane restraint unit is provided inside a pump body of the compressor and is configured to cause a variable-capacity cylinder assembly in the compressor to be in a working state or an idling state under controlling the variable-capacity assembly to act in the setting order;
• and
• wherein the method comprises:
• causing the variable-capacity assembly to act in a setting order;
• causing, by a sliding vane restraint unit, a variable-capacity cylinder assembly in the compressor to be in a working state or an idling state under controlling the variable-capacity assembly to act in the setting order;
• wherein, when the variable-capacity assembly comprises a check valve, a throttling element and an on-off element, the causing the variable-capacity assembly to act in the setting order comprises:
• during a switching process of the variable-capacity cylinder assembly from the working state to the idling state,
• causing the on-off element to be in a closed state;
• causing an opening degree of the throttling element to gradually increase from a lower limit to an upper limit of a setting flow area within a first transition time;
• after completing the switching process of the variable-capacity cylinder assembly from the working state to the idling state, causing the opening degree of the throttling element to be any opening degree in a range from the lower limit to the upper limit of the setting flow area, and maintaining the on-off element in a closed state;
• or,
• during the switching process of the variable-capacity cylinder assembly from the idling state to the working state:
• causing the opening degree of the throttling element to be at the upper limit of the setting flow area;
• causing the on-off element to be in an open state;
• causing the opening degree of the throttling element to be gradually reduced from the upper limit to the lower limit of the setting flow area within a second transition time;
• after completing the switching process of the variable-capacity cylinder assembly from the idling state to the working state, causing the opening degree of the throttling element to be at the lower limit of the setting flow area, and maintaining the on-off element in the open state, or causing the on-off element to be in the closed state;
• wherein,
• when the throttling element is in the closed state and the on-off element is in the open state, causing the check valve to be in an on state;
• or,
• when the throttling element is in the open state and the on-off element is in the closed state, causing the check valve to be in the closed state.