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US 8,485,789 B2Granted
Capacity modulated scroll compressor system and method
AssigneeEmerson Climate Technologies, Inc.
InventorsYumin Gu, Xilai Yang, Simon Wang
Life of this patent
Estimating the term…
Abstract
A system and method for modulating capacity of a scroll compressor having a motor includes determining a target capacity of the scroll compressor, operating the motor at a first speed when the target capacity is within a first predetermined capacity range and at a second speed when the target capacity is within a second predetermined capacity range, determining a pulse width modulation cyclic ratio based on the target capacity and the first or second speed, and periodically separating intermeshing scroll members of the compressor according to the pulse width modulation cyclic ratio to modulate the capacity of the scroll compressor.
Claims10
A method comprising:
- determining a target capacity for a scroll compressor having intermeshing scroll members, a motor, a scroll separation system for separating the intermeshing scroll members, and a delayed suction system for releasing pressure from at least one intermediate chamber created by the intermeshing scroll members;
- comparing the target capacity with a first predetermined capacity range and a second predetermined capacity range, each of the first and second predetermined capacity ranges having an upper capacity range and a lower capacity range;
- operating the motor at a high speed when the target capacity is within the first predetermined capacity range and at a low speed when the target capacity is within the second predetermined capacity range;
- operating the scroll separation system according to a first pulse width modulation cyclic ratio, with the delayed suction system deactivated, when the target capacity is within the upper capacity range of the first predetermined capacity range or the upper capacity range of the second predetermined capacity range, the first pulse width modulation cyclic ratio being calculated based on the target capacity, and the high or low speed;
- and
- operating the scroll separation system according to a second pulse width modulation cyclic ratio, with the delayed suction system activated, when the target capacity is within the lower capacity range of the first predetermined capacity range or the lower capacity range of the second predetermined capacity range, the second pulse width modulation cyclic ratio being calculated based on the target capacity, and the high or low speed.
3 more elements
A method comprising:
- determining a target capacity for a scroll compressor having intermeshing scroll members, a motor, a scroll separation system for separating the intermeshing scroll members, and a delayed suction system for releasing pressure from at least one intermediate chamber created by the intermeshing scroll members;
- comparing the target capacity with a first predetermined capacity range and a second predetermined capacity range, each of the first and second predetermined capacity ranges having an upper capacity range and a lower capacity range;
- operating the motor at a high speed when the target capacity is within the first predetermined capacity range and at a low speed when the target capacity is within the second predetermined capacity range;
- operating the delayed suction system according to a first pulse width modulation cyclic ratio, with the scroll separation system deactivated, when the target capacity is within the upper capacity range of the first predetermined capacity range or the upper capacity range of the second predetermined capacity range, the first pulse width modulation cyclic ratio being calculated based on the target capacity, and the high or low speed;
- and
- operating the scroll separation system according to a second pulse width modulation cyclic ratio, with the delayed suction system fully activated, when the target capacity is within the lower capacity range of the first predetermined capacity range or the lower capacity range of the second predetermined capacity range, the second pulse width modulation cyclic ratio being calculated based on the target capacity, and the high or low speed.
3 more elements
A system comprising:
- a scroll compressor having intermeshing scroll members, a motor, a scroll separation system for separating the intermeshing scroll members, and a delayed suction system for releasing pressure from at least one intermediate chamber created by the intermeshing scroll members;
- a controller, connected to the motor, the scroll separation system, and the delayed suction system, that
- determines a target capacity of the scroll compressor;
- compares the target capacity with a first predetermined capacity range and a second predetermined capacity range, each of the first and second predetermined capacity ranges having an upper capacity range and a lower capacity range;
- operates the motor at a high speed when the target capacity is within the first predetermined capacity range and at a low speed when the target capacity is within the second predetermined capacity range;
- operates the delayed suction system according to a first pulse width modulation cyclic ratio, with the scroll separation system deactivated, when the target capacity is within the upper capacity range of the first predetermined capacity range or the upper capacity range of the second predetermined capacity range, the first pulse width modulation cyclic ratio being calculated based the target capacity, and the high or low speed;
- and
- operates the scroll separation system according to a second pulse width modulation cyclic ratio, with the delayed suction system fully activated, when the target capacity is within the lower capacity range of the first predetermined capacity range or the lower capacity range of the second predetermined capacity range, the second pulse width modulation cyclic ratio being calculated based on the target capacity, and the high or low speed.
5 more elements
Dependencies are inferred from the claim text.