Abstract: A compressor for a system for air-conditioning the passenger compartment of a motor vehicle comprises a casing enclosing a system for compressing a refrigerant fluid, an electric motor for driving the compression system and electronic means for control of the electric motor. A low-pressure intake chamber (24) for the refrigerant fluid is integrated into the casing (6) and is separated from the high-pressure chamber by a separating partition (26). The electronic means for control of the electric motor (12), which are placed in the intake chamber (24), are cooled by the refrigerant fluid. A separate chamber (34) for connection of the motor (12), defined in the casing (6), communicates with the high-pressure chamber (15) via a passage (36). The chambers (24) and (34) are closed off by a cover plate (20) equipped with all the connecting terminals of the compressor.

Abstract: A superconducting device includes a winding including superconductor material, which can be rotated about a rotation axis. For indirect cooling of the winding, a regenerative cryocooler having a co-rotating cold head and including a compressor unit is provided, as well as, in between, a transfer unit including a gas coupling for conveying a working gas between the stationary and rotating parts. The working gas is delivered to the cold head directly after the gas coupling.

Abstract: The scroll compressor includes a scroll compression mechanism portion in combination of an orbiting scroll and a fixed scroll, a frame for supporting the compression portion, a rotary shaft fitted in the orbiting scroll, a motor portion coupled to the rotary shaft, and a hermetic chamber incorporating the above-mentioned components. Windings of a stator of a motor in the motor portion are formed of aluminum wires which are coated with fluororesin compound, that is, the aluminum wires are coated with fluororesin and is molded with a resin material. Ammonia group refrigerant is used in the scroll compressor. Further, a refrigerating system using the above-mentioned scroll compressor, is incorporated therein with a circuit for injecting ammonia group refrigerant into a compression room in the compression mechanism portion.

Abstract: A cooling system controller controls the capacity of a variable capacity compressor based upon the temperature of a housing being cooled, the suction pressure of the compressor or both of these criteria. The cooling system controller is capable of controlling either single-evaporator or multiple-evaporator refrigeration systems. The multiple-evaporator systems can have evaporators of similar temperatures or of mixed temperatures. The controller also allows the use of one or more condenser fans that are operated in a lead/lag fashion to control the cooling capability of the system.

Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.

Abstract: A multistage compression refrigerating machine is disclosed, which efficiently cools a rotating machine such as an electric motor and lubricating oil by using a refrigerant and increases the amount of refrigerant to be used to provide the refrigerating capacity in the evaporator, thereby improving the refrigerating capacity. The machine comprises a condenser for supplying a condensed refrigerant to an evaporator via a subcooler: a multistage compression system for absorbing the above refrigerant, absorbing a refrigerant evaporated from the subcooler, from an intermediate position between adjacent compressors, compressing the absorbed refrigerants together, and discharging it to the condenser; a rotating-machine cooler for cooling a rotating machine for driving the multistage compression system; and a lubricating-oil cooler for cooling lubricating oil.

Abstract: Moisture in a refrigeration circuit is absorbed by means of a polyvinyl ether oil that has hygroscopicity and serves as a refrigerating machine oil. Therefore, even if a compressor comes to have an elevated temperature attributed to the employment of a refrigerant made of a single substance of R32, the insulating film of the built-in motor of the compressor is hard to hydrolyze. Moreover, by setting a saturated moisture amount of polyvinyl ether at a temperature of 30° C. and a relative humidity of 80% to 5000 ppm or more, a tensile strength retention rate of the motor insulating film made of PET or PEN, which can easily be processed, can be set to 50% or more, by which the deterioration of the insulating film can be prevented. Therefore, the performance of the refrigerating apparatus can be stabilized for a long term by avoiding the breakdown of the compressor.

Abstract: A centrifugal compressor assembly includes two centrifugal compressor stages, a diffuser duct, a plurality of collection chambers, inlet and outlet tubing, and a built-in electrical motor between the stages. The centrifugal compressor assembly is used in a refrigerating system. The electrical motor includes a rotor positioned with the compressor stage rotors on one shaft mounted on gasodynamic bearings, with the stator fixed inside the motor housing, forming a cooling skirt. The cooling skirt for the stator is formed by lengthwise slots on the surface of the stator in contact with the housing, with the ends of the slots being connected to annular grooves on the internal surface of the motor housing. Each of the annular grooves is connected to coolant feed and discharge ducts.

Abstract: A dehydrating device for refrigerant has an external casing with an input hole and an output hole formed in a first end thereof. The device is provided with a desiccating filter and is arranged with a substantially U-shaped tube. A diffusion device is provided and a first end of the tube is connected to the output hole, a second end of the tube is open and is in juxtaposition with the diffusing device and the diffusing device is located in upper portion of the casing.

Abstract: A cooling fluid system is disclosed for providing cryogenic cooling fluid to a high temperature super-conducting machine, wherein said system includes a main cooling system (52, 88) and a second cooling system, said second cooling system comprising a storage device having a first cryogenic fluid; at least one cooling coupling in fluid communication with the first cryogenic fluid from the storage device and a second cryogenic fluid flowing through the main cooling system.

Abstract: In a refrigerating apparatus using an HFC group refrigerant, the. performance is improved by increasing the refrigerating capacity and a stable operation is made possible. In order to achieve this, a cycle system in a refrigerator is structured so as to connect a compressor, a condenser, a liquid receiver and a supercooler in this order. In an air-cooled separation type refrigerator, the liquid receiver is disposed within an air-cooled type condenser unit. Further, in the case where a flush gas is liable to be generated in a liquid pipe, a vapor-liquid separator is disposed within the compressor unit integral with an accumulator and separated therefrom by a partition plate.

Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.

Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.

Abstract: A scroll compressor is provided with economizer injection ports which extend through the wrap of one of the scroll members. Preferably the injection ports are formed through a so-called “hybrid” wrap which has a varying thickness. The other scroll member is provided with grooves in its base plate. The injection of economizer fluid occurs only during a portion of the orbiting cycle when the injection port and corresponding grooves are aligned with each other. However, as the orbiting cycle continues, the injection port will no longer be aligned with the groove. At that point, the injection is ceased. This allows a simple and precise way for valving the flow of the economizer fluid into the compression chambers.

Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.

Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.

Abstract: A motor-driven compressor according to the present invention is formed with a housing that contains a compression portion and a motor for compressing refrigerant. The compressor housing further is provided with a suction housing for introducing the refrigerant. A capacitor is provided for smoothing a current that is supplied from a power source to the motor. The capacitor is in contact with the suction housing. In such motor-driven compressors, because the capacitor is in contact with the suction housing, heat transfer from the capacitor to the housing may effectively be facilitated. In further embodiments of the present invention, the capacitors may be disposed on various portions of the suction housing and in various orientations relative to an axial direction of the motor-driven compressor. These selected orientations reduce the dimensions of the motor-driven compressor.

Abstract: A refrigerating apparatus is provided with a supercooling circuit 8 having a supercooling heat exchanger 15 provided between a condenser 3 and a main expansion mechanism 9 and an injection circuit 10 for injecting a gas refrigerant from the supercooling heat exchanger 15 into an intermediate-pressure portion 1a of a compressor 1. A motorized expansion valve 16 is provided in a supercooling pipe that diverges from the main flow on the upstream P1 side of the supercooling heat exchanger 15 and reaches the supercooling. heat exchanger 15. By completely closing the motorized expansion valve 16, the injection operation of the injection circuit 10 can be turned off. The degree of supercooling of the supercooling circuit 8 and the amount of injection of the injection circuit 10 can be set to desired values by controlling the motorized expansion valve 16 to a specified degree of opening. The supercooling circuit and the injection circuit can be controlled with reduced noises at low cost.

Abstract: A compressor for a system for air-conditioning the passenger compartment of a motor vehicle comprises a casing enclosing a system for compressing a refrigerant fluid, an electric motor for driving the compression system and electronic means for control of the electric motor. A low-pressure intake chamber (24) for the refrigerant fluid is integrated into the casing (6) and is separated from the high-pressure chamber by a separating partition (26). The electronic means for control of the electric motor (12), which are placed in the intake chamber (24), are cooled by the refrigerant fluid. A separate chamber (34) for connection of the motor (12), defined in the casing (6), communicates with the high-pressure chamber (15) via a passage (36). The chambers (24) and (34) are closed off by a cover plate (20) equipped with all the connecting terminals of the compressor.

Abstract: Compressors may include a compressor housing having a compression chamber defined within the compressor housing. The compression chamber is preferably arranged and constructed to compress and discharge a fluid drawn into the compression chamber. A unit housing may be coupled to the compressor housing. A control device may be disposed within the unit housing and the control device preferably controls electric components of the compressor. Further, a suction passage is preferably defined to introduce the fluid into the compression chamber. The suction passage preferably penetrates through the unit housing so as to directly cool the control device due to the fluid flowing through the suction passage.

Abstract: In a scroll compressor that can switch between an internal high-pressure operation and an internal low-pressure operation, in order to provide proper back pressure for an orbiting scroll during either operation, a back pressure chamber of the orbiting scroll is divided by means of a first and a second thrust rings into a first back pressure chamber in communication with a driving chamber and an independent second back pressure chamber, and the pressure in the second back pressure chamber is set at discharge pressure or suction pressure depending on an operation mode.

Abstract: There is provided an apparatus where a first cooler and a second cooler are provided in a refrigeration circuit and difluoromethane having its temperature lowered by these devices is let into a rotary compressor and compressed therein. As a result, the apparatus with high performance and reliability is provided without impairment of the chemical stability of lubricant oil or difluoromethane if the difluoromethane is used as a refrigerant.

Abstract: An optimized position for an economizer shut-off valve, or other method of increasing the volume in an economizer line is disclosed In one embodiment, the economizer shut-off valve is positioned directly downstream of the economizer heat exchanger. In a second embodiment, the valve is positioned upstream of the economizer expansion valve and the economizer heat exchanger. In a third embodiment, the economizer expansion valve is also provided with an appropriate control such that it can be utilized as the shut-off valve. In the fourth embodiment, additional volume is added to the economizer line. With each of these embodiments, the volume of the economizer line between the compressor and the economizer shut-off valve is relatively large compared to the prior art. Benefits with regard to temperature control, efficiency and capacity increase are achieved by this invention. Moreover, a less expensive shut-off valve can be utilized.

Abstract: The invention relates to a device for implementing an additional heating system for a motor vehicle, having a heating/air-conditioning unit of a motor vehicle, which has a compressor that is driven by an electric motor and is arranged in a compression-type refrigerating circuit. In order to achieve additional heating of the motor vehicle in a simple manner while nevertheless obtaining the possibility of heating the motor vehicle rapidly and reliably, the electric motor (17) and/or at least the power components (30) of engine electronics (29) controlling the electric motor (17) are arranged in such a way that the waste heat of the electric motor (17) and/or the power components (30) is dissipated by a refrigerant or a heating agent of the heating/air-conditioning unit (1), which releases the heat absorbed to the interior of the vehicle.

Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.

Abstract: It is proposed to design a compression-type refrigeration system of a motor-vehicle air-conditioning unit having a supercritical process, with a compressor (6), driven by an electric motor (5) with motor-control device (12), a gas cooler (27), an expansion member (8) and an evaporator (9) and also connecting elements for a circulation of a refrigerant, in such a way that the heat loss of the motor and/or of the motor-control device is essentially dissipated to the refrigerant. In particular, the refrigerant may flow around the motor and/or the motor-control device. This results in especially efficient cooling of the components, as a result of which their heat loss is reduced at the same time. Furthermore, in order to achieve a high efficiency of the entire unit, provision is made for the superheating of the refrigerant at the inlet of the compressor to be kept at a virtually constant level by a controlled expansion member.

Abstract: A compression mechanism is provided, in a casing, and operatively coupled via a drive shaft 17 to an electric motor 21 accommodated in a motor chamber 15 within the casing, so that power can be transmitted. An in-shaft bore 17A is formed in the drive shaft and a first bifurcated hole 17B is formed for communicating the in-shaft bore 17A to the motor chamber 15. The in-shaft bore 17A is communicated to the suction chamber 31 via a second collecting hole 13F, the collecting chamber 13D and a suction communication hole 13G formed in a cylinder block 13. Thereby, part of the refrigerant sucked in the casing is introduced to the compression mechanism through a gap between a stator 19 and a rotor 20, and the remainder of the refrigerant is introduced to the compression mechanism without being used for cooling the electric motor 21.

Abstract: An air conditioning unit comprises a conventional refrigeration circuit including a conventional primary capillary for reducing the pressure of refrigerant flowing from a condenser outlet to an evaporator inlet. During abnormal operating conditions, i.e., when outside temperature is above a predetermined value, a secondary pressure reducing capillary bypasses the evaporator to supply refrigerant flowing out of the condenser to an inlet of a compressor, also responsive to refrigerant flowing out of the evaporator. Refrigerant flowing from the compressor flows into the condenser.

Abstract: A motor-driven compressor is formed integrally with a compression portion and a motor for compressing refrigerant. The motor-driven compressor includes a drive circuit for controlling the driving of the motor. The drive circuit is incorporated into a refrigerant suction side portion of the motor-driven compressor. The motor-driven compressor may be made small and inexpensively, as well as the total system which includes the drive circuit. The assembly of the system may also be more easily facilitated. Further, electromagnetic radiation from an inverter of the drive circuit may be shielded.

Abstract: In a refrigerating apparatus using an HFC group refrigerant, the performance is improved by increasing the refrigerating capacity and a stable operation is made possible. In order to achieve this, a cycle system in a refrigerator is structured so as to connect a compressor, a condenser, a liquid receiver and a supercooler in this order. In an air-cooled separation type refrigerator, the liquid receiver is disposed within an air-cooled type condenser unit. Further, in the case where a flush gas is liable to be generated in a liquid pipe, a vapor-liquid separator is disposed within the compressor unit integral with an accumulator and separated therefrom by a partition plate.

Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.

Abstract: The present invention provides a method and system for controlling and limiting the discharge temperature of a compressor of a refrigeration system. The invention is suitable for converting an existing refrigeration system which operates with one refrigerant to use with another refrigerant which can cause high discharge temperatures. The invention includes a, simple four-part system—a temperature sensor to sense the discharge temperature, an injection valve for injecting liquid refrigerant into the suction gas line of the compressor, a fluid line for providing liquid refrigerant to the valve from the condenser and a digital controller for actuating the valve.

Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.

Abstract: A refrigeration chiller employs a centrifugal compressor the impellers of which are mounted on a shaft which is itself mounted for rotation using rolling element bearings lubricated only by the refrigerant which constitutes the working fluid of the chiller system. Apparatus is taught for providing liquid refrigerant to (1.) the bearings immediately upon chiller start-up, during chiller operation and during a coastdown period subsequent to shutdown of the chiller and (2.) the drive motor of the chiller's compressor for motor cooling purposes. By use of a variable speed-driven motor to drive the compressor, optimized part load chiller performance is achieved in a chiller which does not require or employ an oil-based lubrication system.

Abstract: In an air conditioner having a refrigerant circuit in which a compressor, a four-way switching valve, an outdoor-side heat exchanger, an expansion valve, and an indoor-side heat exchanger are connected in succession via pipes, the interior of an enclosed vessel of a compressor, which contains a refrigerant compressing section and an electric motor, is divided airtightly into a refrigerant discharge chamber and an electric motor chamber, two refrigerant flow path pipes are provided on the electric motor chamber side, and these refrigerant flow path pipes are appropriately switched to the refrigerant discharge side and the refrigerant suction side of the compressor via the four-way switching valve, whereby one compressor can be used as an internal high pressure type or an internal low pressure type.

Abstract: In order to improve a refrigerant compressor apparatus comprising a drive motor, a compressor driven by the drive motor and having several cylinders arranged in a V shape and a compressor shaft bearing eccentrics for driving pistons operating in the respective cylinders in such a manner that as smooth a running as possible can be achieved at any desired V angle it is suggested that the cylinders be arranged at a V angle of less than 90°, that the compressor shaft be mounted with only two bearing sections thereof in corresponding compressor shaft bearings, that the eccentrics be arranged between the bearing sections and that a separate eccentric be provided for each piston and be arranged at a distance from the other, individual eccentrics for the respectively other pistons.

Abstract: In a preferred embodiment, a single motor drives both oil and refrigerant pumps in a refrigeration chiller, the motor and oil pump being disposed in the chiller's oil supply tank and the refrigerant pump being disposed exterior thereof. The refrigerant pump pumps liquid refrigerant to the chiller's compressor section so as to cool the motor by which the compressor is driven while the oil pump pumps oil to chiller locations that require lubrication when the chiller is in operation. A uniquely designed impeller permits low pressure liquid refrigerant in its liquid state to be reliably pumped to a location of use, without significant flashing, from a source location which is at a height only a short distance above the pump inlet. A stand alone refrigerant pump embodiment is also described.

Abstract: In a preferred embodiment, a single motor drives both oil and refrigerant pumps in a refrigeration chiller, the motor and oil pump being disposed in the chiller's oil supply tank and the refrigerant pump being disposed exterior thereof. The refrigerant pump pumps liquid refrigerant to the chiller's compressor section so as to cool the motor by which the compressor is driven while the oil pump pumps oil to chiller locations that require lubrication when the chiller is in operation. A uniquely designed impeller permits low pressure liquid refrigerant in its liquid state to be reliably pumped to a location of use, without significant flashing, from a source location which is at a height only a short distance above the pump inlet. A stand alone refrigerant pump embodiment is also described.

Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.

Abstract: In a refrigerating apparatus using an HFC group refrigerant, the performance is improved by increasing the refrigerating capacity and a stable operation is made possible. In order to achieve this, a cycle system in a refrigerator is structured so as to connect a compressor, a condenser, a liquid receiver and a supercooler in this order. In an air-cooled separation type refrigerator, the liquid receiver is disposed within an air-cooled type condenser unit. Further, in the case where a flush gas is liable to be generated in a liquid pipe, a vapor-liquid separator is disposed within the compressor unit integral with an accumulator and separated therefrom by a partition plate.

Abstract: An improved efficiency economizer system for compressors incorporates the use of a check valve blocking return flow into the economizer return line. The economizer return line communicates with an economizer port, which communicates with a compression chamber. Pressure in the compression chamber can vary during the operational cycle of the compressor. Thus, in the past, there has sometimes been backflow of refrigerant through the economizer injection port and into the return line. The present invention prevents this backflow. Most preferably, the invention is utilized on scroll compressors; however, other types of compressors may benefit from this invention.

Abstract: In an air conditioner having a refrigerant circuit in which a compressor, a four-way switching valve, an outdoor-side heat exchanger, an expansion valve, and an indoor-side heat exchanger are connected in succession via pipes, the interior of an enclosed vessel of a compressor, which contains a refrigerant compressing section and an electric motor, is divided airtightly into a refrigerant discharge chamber and an electric motor chamber, two refrigerant flow path pipes are provided on the electric motor chamber side, and these refrigerant flow path pipes are appropriately switched to the refrigerant discharge side and the refrigerant suction side of the compressor via the four-way switching valve, whereby one compressor can be used as an internal high pressure type or an internal low pressure type.

Abstract: A portion of the condensed liquid in a condenser is diverted to a generator where it supplies heat to boil off refrigerant from a refrigerant oil mixture and is thereby subcooled. The subcooled liquid is supplied to the motor for cooling. The boiling off of refrigerant in the generator results in an “oil rich” liquid which is supplied to the bearings, etc. for lubrication. One, or more, jet or ejector pumps are preferably used to supply the oil rich liquid to the lubrication distribution system.

Abstract: In a scroll compressor provided with a fixed scroll member (4) and a movable scroll member (3) which define a plurality of compression spaces (6) therebetween in cooperation with each other, a hole (32) is formed to the fixed scroll member to be communicable with adjacent ones of the compression spaces. The adjacent compression spaces are different from each other in pressure when the scroll compressor is driven. A piston valve (33) is disposed in the hole and controls communication between the adjacent compression space through the hole. The compression spaces are movable with volumes reduced by movement of the movable scroll member.

Abstract: A refrigeration chiller employs a centrifugal compressor the impellers of which are mounted on a shaft which is itself mounted for rotation using rolling element bearings lubricated only by the refrigerant which constitutes the working fluid of the chiller system. Apparatus is taught for providing liquid refrigerant to (1.) the bearings immediately upon chiller start-up, during chiller operation and during a coastdown period subsequent to shutdown of the chiller and (2.) the drive motor of the chiller's compressor for motor cooling purposes. By use of a variable speed-driven motor to drive the compressor, optimized part load chiller performance is achieved in a chiller which does not require or employ an oil-based lubrication system.

Abstract: A refrigeration unit using HFC group coolant, having an enhanced cooling capacity so that the performance and the performance coefficient thereof can be enhanced, and the operation thereof can be stably made, the refrigeration unit having a refrigerating cycle in which a compressor 1, a condenser, a expansion valve and an evaporator, the expansion valve are connected in series in the mentioned order, d comprises HFC group coolant, and a subcooler located between the condenser and the evaporator, wherein the HFC group coolant is turned into liquid coolant in the subcooler, and is then branched into a main liquid stream and a substream which super-cools the main liquid stream through a super-cooling expansion valve, and is led into the intermediate stage part of the compressor.

Abstract: A system for controlling the amount of foam ingested to a compressor of a cooling system is presented. The present invention utilizes a heated thermistor to control an electrically positioned expansion valve feeding liquid refrigerant to a system evaporator. The thermistor is controlled to be a few degrees warmer than the discharge saturation temperature of the refrigerant exiting the compressor. The saturation temperature corresponding to the compressor discharge pressure is calculated by a microprocessor and compared to the thermistor temperature. If the difference is greater or less than desired, the microprocessor will send the proper signals to the electrically positioned expansion valve thereby controlling the rate of foam ingested by the compressor.

Abstract: A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant pump (36) is stopped at, for example, a power failure, thereby preventing the bearings (39 to 42) from being damaged. To that end, the compressor (30) is further provided with a header (52) for storing a predetermined amount of a high-pressure liquid refrigerant, and with check valves (51, 54 and 56) for maintaining the internal pressure of this header (52) at a high pressure for a predetermined time period after a power failure occurs.

Abstract: In order to improve a refrigerant compressor comprising a motor unit which has a motor and a cooling duct for the motor originating from an outer cooling duct connection as well as a compressor unit which has a compressor stage with a compressor stage inlet and a compressor stage outlet and a suction duct originating from an outer suction connection, this duct, like the cooling duct, being guided to the compressor stage inlet, such that the cooling can be realized variably with as few constructional alterations as possible it is suggested that an outer connection unit be provided, on which the cooling duct connection and the suction connection are arranged, that the connection unit have a receiving means and an adjustment part which can be inserted into the receiving means in at least two different positions and that as a result of the various positions of the adjustment part the amounts supplied to the cooling duct connection and the suction connection of the total quantity of the suction gas supplied via an

Abstract: A refrigeration system to be driven by an electrical power source. A compressor mechanism in a hermetically sealed compressor housing circulates a refrigerant located within the compressor housing through a loop. A motor in the compressor housing and in contact with the refrigerant within the compressor housing is coupled with the compressor mechanism. A power supply line adapted to be connected to the electrical power source has an interior portion passing through and located within the compressor housing. The interior portion is in contact with the refrigerant in the compressor housing. A power switching circuit in the compressor housing and in contact with the refrigerant within the compressor housing connects between the power supply line and the winding for selectively applying electrical power from the electrical power source to a motor winding.