Two stage reciprocating compressors and associated HVAC system and methods
First Claim
1. A system for cooling a space comprising:
- a two stage compressor that operates either at a first fixed maximum load or at a reduced second fixed load;
an evaporator, a condenser, and an expansion device in a refrigeration loop with said compressor;
a two stage evaporator blower that operates either at a first fixed maximum load or at a second reduced fixed load; and
a control system interconnected with the compressor and blower and designed to operate the compressor and blower at the respective first stages when the cooling requirement exceeds a preselected value and at the respective second stages when the cooling requirements fall below that preselected value.
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Accused Products
Abstract
A two stage reciprocating compressor and associated HVAC systems and methods are disclosed. The reciprocating compressor includes a crankshaft having an eccentric crankpin, a reversible motor for rotating the crankshaft in a forward and a reverse direction, and an eccentric, two position cam rotatably mounted over the crankpin. The crankshaft and cam combine to cause the piston to have a first stroke when the motor operates in the forward direction and a second stroke when the motor operates in the reverse direction. The cam and crankpin also include stabilization means to restrict the relative rotation of the cam about the crankpin. A lubrication system is provided to lubricate the engaging surfaces of the crankshaft and cam and between the cam and the bearing surface of the connecting rod. There is also provided a control for selectively operating the motor either in the forward direction at a first power load or in the reverse direction at a reduced second power load. A protector for the motor is also provided. In addition, the application of the reciprocating compressor to both air conditioning and heat pump systems is disclosed.
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Citations
27 Claims
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1. A system for cooling a space comprising:
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a two stage compressor that operates either at a first fixed maximum load or at a reduced second fixed load;
an evaporator, a condenser, and an expansion device in a refrigeration loop with said compressor;
a two stage evaporator blower that operates either at a first fixed maximum load or at a second reduced fixed load; and
a control system interconnected with the compressor and blower and designed to operate the compressor and blower at the respective first stages when the cooling requirement exceeds a preselected value and at the respective second stages when the cooling requirements fall below that preselected value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of cooling a space comprising the steps of:
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providing an air conditioning system including a two stage compressor having a first fixed load and a second fixed load, an evaporator, a two stage evaporator blower, an expansion device, and a condenser;
sensing the condition of the space to be cooled; and
controlling the compressor and blower motor to operate at their respective first stages when cooling load exceeds a predetermined level and to operate at their respective second stages when the cooling load falls below the predetermined level. - View Dependent Claims (21, 22, 24, 25, 26, 27)
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23. The method of claim 23 wherein only a single condenser is included in the system but multiple evaporators are included in the system.
Specification