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Match Document Document Title
7404701 Refrigerating system having reciprocating compressor  
A refrigerating system includes: an evaporator ( 2 ) for performing a cooling operation as a refrigerant is evaporated; a compressor ( 4 ) for compressing the refrigerant discharged from the...
7296427 Hybrid compressor device for a vehicle  
In a hybrid compressor for a vehicle where a vehicle engine is stopped when the vehicle is temporally stopped, a pulley, a motor and a compressor can be driven in independent from each other, and...
7240502 Method for controlling operation of air-conditioner  
A method for controlling operations of an air-conditioner includes: a step in which when an operation load of an air-conditioner increases, if an outputted compressing capacity of the...
7207185 Vehicle air conditioning apparatus  
A vehicle air conditioning apparatus includes a refrigerant circulation circuit. The vehicle air conditioning apparatus has a variable displacement type compressor, a first pressure monitoring...
7140198 Air conditioner  
The present invention is capable of eliminating the line unit in an air conditioner that includes a plurality of heat source units, and hold increases in onsite line construction to a minimum while...
7082774 Compressor oil removal in ammonia refrigeration system  
Automatic oil removal from an ammonia evaporator/low pressure vessel in a refrigeration system is disclosed. A liquid refrigerant level controller is utilized to drain the oil. The controller works...
7036329 Lowering of refrigerant emissions by cycling of a variable displacement compressor  
In order to reduce refrigerant leakage from an automotive air conditioning system, the leakage paths are kept sealed by automatically reducing the output of a variable displacement compressor ( 12...
6993920 Heater cycling for improved oil return  
A method comprises the steps of (a) providing a refrigeration unit having a refrigerated or heated space and at least one measured operating parameter, (b) providing heat to the refrigerated space...
6990822 Pressure adjusting device for air conditioning system and air conditioning system equipped with the same  
The present invention relates to an air conditioning system provided with an outdoor unit having a compressor and an outdoor heat exchanger, an indoor unit having an indoor heat exchanger, and a...
6983793 Dual evaporator air conditioning system and method of use  
A dual evaporator air conditioning system and method for use therewith to cool air in front and rear portions of a cabin of a vehicle. The dual evaporator air conditioning system includes primary...
6925822 Oil return control in refrigerant system  
Several control algorithms reduce the likelihood of insufficient oil return to the compressor. One algorithm is useful in a multi-circuit refrigerant system. A control reduces the cooling capacity...
6886354 Compressor protection from liquid hazards  
Two liquid levels are sensed in the oil sump of a compressor to determine if sufficient oil and excess refrigerant are present prior to starting the compressor and appropriate steps taken, if...
6874328 Hybrid compressor device  
In a hybrid compressor for a vehicle where a vehicle engine is stopped when the vehicle is temporally stopped, a pulley, a motor and a compressor can be driven in independent from each other, and...
6834513 Crankcase heater control  
A controller for controlling a heater associated with the crankcase of a compressor senses electrical current flowing through the heater. The sensing is preferably accomplished by a transformer in...
6735965 Air conditioning apparatus and control method thereof  
An air conditioning apparatus and control method thereof includes an inverter-type compressor and a two-stage variable-capacity compressor connected in parallel with their respective capacities...
6675607 Swash plate type compressor  
An oil separator is provided on a bleeding channel inside the shaft 16. By integral rotation of the shaft 16 and a rotary valve, oil contained in a refrigerant gas is centrifuged via the oil...
6637218 Gas heat pump-type air conditioner  
The present invention provides a gas heat pump-type air conditioner that can reliably notify a user that the time for changing the engine oil of the gas engine that drives the compressor has...
6604371 Oil amount detector, refrigeration apparatus and air conditioner  
An oil holding tank ( 40 ) is communicated to the case ( 10 c ) of the compressor ( 10 ). Part of the refrigerant discharged from the compressor ( 10 ) is introduced into the oil holding tank ( 40...
6516627 Flowing pool shell and tube evaporator  
An evaporator for a refrigeration chiller includes a tube bundle in which at least a portion of the tubes of the tube bundle are immersed in a pool which include both liquid refrigerant and is...
6484517 Compressor oil pressure control method and unit  
The present invention relates to the art of refrigeration and more particularly to a method of regulating the cooling process by controlling the oil pressure in a compressor. The system prevents...
6467287 Valve arrangement for a compressor  
A compressor and oil separator assembly for compressing a fluid includes a suction end, a discharge end, and first and second rotors rotatably mounted between the suction and discharge ends. A...
6367272 Compressor capacity control system and method  
An apparatus and system for manipulating the air temperature within an interior compartment of a vehicle, the apparatus and system includes a HVAC system and an operating system. A compressor...
6276901 Combination sight glass and sump oil level sensor for a hermetic compressor  
A combination sight glass and optical sensor is provided in the housing of a hermetic compressor to provide effective visual inspection in addition to automatic sensing of the level of oil in an...
6266967 Refrigerant cycle system for vehicle air conditioner  
In a refrigerant cycle system for a vehicle air conditioner, when a continuous operation time of a compressor elapses a predetermined time after the compressor operates, operation of the compressor...
6244059 Eductor based oil return for refrigeration systems  
In a compression type refrigeration system having a volatile refrigerant circulating along with lubricating oil, member for causing oil to flow from a first location to a second location, where the...
6216474 Part load performance of variable speed screw compressor  
Lubrication supply to the rotors of a variable speed screw compressor is optimized for full load and a supplemental supply path is provided which is opened during low speed operation.
6167719 Compressor for refrigeration cycle  
In a compressor of a refrigeration cycle using an HC-based refrigerant and a lubricant having specific gravity greater than that of the HC-based refrigerant and having no or no or less mutual...
6161395 Liquid level sensor  
A sensor system. The system comprises a binary sensor issuing a signal representative of a first or second condition; sampling circuitry, operatively connected to the binary sensor, for monitoring...
6145326 Forced oil cooling for refrigeration compressor  
The invention is a method and apparatus for cooling compressor oil in a refrigeration system by passing the oil through a heat exchanger cooled by evaporating refrigerant. The refrigerant is pumped...
6145325 Method for operating a motor vehicle air conditioner with a compressor with lubricant circulation  
A method for operating a motor vehicle air conditioner includes starting a compressor, and lubricating the compressor with a circulating lubricant for at least a specified minimum lubricating time.
6134898 Positive-displacement-type refrigerant compressor with a novel oil-separating and lubricating system  
A capacity type refrigerant compressor having a compression chamber in which a refrigerant introduced from a suction system is compressed and discharged as a compressed high pressure refrigerant,...
6125642 Oil level control system  
This oil level control device is for a refrigeration system, the control device being attached between the compressor and the oil supply. The control device includes a housing having an inlet...
6116046 Refrigeration chiller with assured start-up lubricant supply  
An assured supply of lubricant to the compressor in a refrigeration chiller is provided by a reservoir that is connected in parallel with the main line by which lubricant is supplied to the...
6041605 Compressor protection  
Responsive to a request for refrigeration, a start up sequence is initiated and, if start up is achieved, a number of motor and compressor parameters of operation are sensed for controlling and...
5970727 Refrigerating cycle apparatus  
A refrigerating cycle apparatus including an inverter driven compressor with controllable speed of rotation, a four-way valve, an indoor heat exchanger, a pressure reducing device, outdoor heat...
5937659 Oil viscosity control method/system for a refrigeration unit  
A method for controlling oil viscosity in a refrigeration unit having an oil viscosity effecting parameter with a desired set point. The refrigeration unit includes an oil lubricated compressor...
5901559 Electromechanical regulator  
An oil level regulator is disclosed for use in a refrigeration system which has an oil reservoir and at least one compressor with a crankcase for containing oil. The regulator has a body with an...
5884497 Automotive air conditioner  
An automotive air conditioner which is capable of suppressing periodic torque variation in an engine-driven refrigerant compressor while ensuring performance of returning oil thereto to circumvent...
5884494 Oil flow protection scheme  
A protection system for a compressor. The system comprises a compressor having a discharge and including at least one rotor and at least one bearing; a lubrication system including at least one oil...
5842352 Refrigeration system with improved liquid sub-cooling  
A refrigeration system has a compressor operable to supply relatively hot compressed refrigerant gas, a condenser to liquify the relatively hot compressed refrigerant gas from the compressor, a...
5842354 Climate controller for automobiles  
A climate controller for an automobile, comprising a compressor and a receiver arranged in an engine compartment of the automobile, a condenser located at an outside-air inlet of the engine...
5782098 Freezer control unit  
To exercise control so that, when power is restored in the case of there having been a prower cut, the motor does not run simultaneously with other devices which reqire large amounts of power when...
5765994 Low oil detector with automatic reset  
An optical liquid level sensor for distinguishing between the presence of oil and vapor within a compressor crankcase. The sensor has a light transmitting window positioned to interface the...
5724821 Compressor oil pressure control method  
The present invention is a method for controlling oil lubricant pressure of a screw type compressor in an air conditioning system. In response to a low oil pressure condition, evaporator pressure...
5673570 Oil equalizing operation control device for air conditioner  
Two outdoor units (2A, 2B) are connected in parallel to a main liquid line (7L) and a main gas line (7G). Three indoor units (3A, 3B, 3C) are connected in parallel to the main liquid line (7L) and...
5634345 Oil monitoring system  
An apparatus and method determines and controls the oil level in one or more refrigeration system compressors. The invention returns lubricating oil to the compressors to maintain oil levels...
5605058 Air conditioning system, and accumulator therefor and manufacturing method of the accumulator  
An air conditioning system of the present invention has a refrigerant circuit including a compressor, an oil separator, a condenser, a expansion device, an evaporator, a first accumulator, and a...
5603227 Back pressure control for improved system operative efficiency  
A normally closed valve is located downstream of the oil separator to insure that sufficient oil pressure builds up to lubricate the compressor. The valve is responsive to the differential pressure...
5572878 Air conditioning apparatus and method of operation  
Two compressors are connected in tandem for an air conditioning system. A control board that includes a microcontroller controls the operation of the system in response to the energization of first...
5522233 Makeup oil system for first stage oil separation in booster system  
In a system having low and high stage compressors with an oil separator downstream of each stage there can be a tendency for oil from the first stage to collect in the second stage. So, responsive...
Matches 1 - 50 out of 115 1 2 3 >