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A system and method of maintaining multiple temperatures using a single refrigeration system. A single refrigeration system includes a compressor, reservoir, condenser and associated piping is selectively coupled to one of a plurality of evaporator units. Each evaporator unit has an inlet valve, an

A system and method of maintaining multiple temperatures using a single refrigeration system. A single refrigeration system includes a compressor, reservoir, condenser and associated piping is selectively coupled to one of a plurality of evaporator units. Each evaporator unit has an inlet valve, an expansion valve and an evaporator. A sensor signals a microprocessor that one of the plurality of evaporators requires cooling, initiating a cooling cycle. The compressor is energized and the evaporator inlet valve opens, allowing refrigerant to flow through the evaporator unit. At the conclusion of the cooling cycle, the evaporator inlet valve closes while the compressor continues to operate allowing the removal or drawing down of the refrigerant from the evaporator prior to cooling another evaporator section. At the conclusion of the draw down process, the compressor is de-energized.

대표청구항 ▼

A system and method of maintaining multiple temperatures using a single refrigeration system. A single refrigeration system includes a compressor, reservoir, condenser and associated piping is selectively coupled to one of a plurality of evaporator units. Each evaporator unit has an inlet valve, an

A system and method of maintaining multiple temperatures using a single refrigeration system. A single refrigeration system includes a compressor, reservoir, condenser and associated piping is selectively coupled to one of a plurality of evaporator units. Each evaporator unit has an inlet valve, an expansion valve and an evaporator. A sensor signals a microprocessor that one of the plurality of evaporators requires cooling, initiating a cooling cycle. The compressor is energized and the evaporator inlet valve opens, allowing refrigerant to flow through the evaporator unit. At the conclusion of the cooling cycle, the evaporator inlet valve closes while the compressor continues to operate allowing the removal or drawing down of the refrigerant from the evaporator prior to cooling another evaporator section. At the conclusion of the draw down process, the compressor is de-energized. ed valve that allows the fluid to flow from the brake release duct to said cooling duct only when the fluid pressure in the brake release chamber is at least equal to a determined pressure. 7. A system as claimed in claim 1, wherein the cooling duct communicates with the disk enclosure in a region of said enclosure that is adjacent to the axis of rotation about which the rotor rotates relative to the stator. 8. A system as claimed in claim 7, wherein perforations are provided in brake disk portions of the brake disks that lie in that region of the disk enclosure which is adjacent to the axis of rotation about which the rotor rotates relative to the stator, the perforations of the disks successively disposed in the axial direction being angularly offset relative to one another. 9. A system as claimed in claim 1, wherein the disks of the second series, which disks are secured to the rotor, are of outside diameter greater than an outside diameter of the disks of the first series, which disks are secured to the stator, the rotor extending at least in part about the stator, and each disk of the second series co-operating with the rotor via an outer periphery thereof, while each disk of the first series co-operates with the stator via an inner periphery thereof. 10. A system as claimed in claim 1, wherein the rotor is supported as it rotates relative to the stator by a bearing comprising at least one roller bearing disposed in a roller bearing enclosure in continuous communication with the disk enclosure. 11. A hydraulic motor comprising a rotary cylinder block having radial pistons and disposed in a stationary casing having a reaction member for the pistons, said hydraulic motor having a rotor and a stator which are constrained to rotate respectively with the cylinder block and with the casing of said motor, the latter having a braking system comprising brake disks disposed in a disk enclosure, which disks are distributed in a first series of disks secured to the stator and in a second series of disks constrained to rotate with the rotor relative to the stator, the system further comprising a brake piston device that can be caused to go between a braking configuration in which an active portion of said piston device co-operates with the brake disks so as to urge said disks into braking contact, and a brake release configuration, the system further comprising control means for controlling the piston device, which control means comprise braking resilient return means continuously urging the brake piston device towards its braking configuration, a brake release chamber distinct from the disk enclosure and suitable for being fed with pressurized fluid via a brake release duct so as to urge the brake piston device into its brake release configuration, and a braking chamber suitable for being fed with pressurized fluid so as to urge the brake piston device towards its braking configuration, the braking system further comprising a cooling device for cooling the brake disks by means of fluid flow, wherein, for the purpose of being fed with cooling fluid, the cooling device is provided with a cooling duct branching from the brake release duct and communicating with the disk enclosure, said cooling duct being formed in a casing portion of the braking system, and wherein the system is provided with means for limiting the quantity of cooling fluid tapped by the cooling duct from the brake release duct. 12. A motor as claimed in claim 11, wherein the cooling duct is connected to the brake release duct via a connection segment which is formed in a casing portion and which has an end that is situated at the outer periphery of said casing portion and that is closed by removable closure means. 13. A motor as claimed in claim 11, wherein the cooling duct is connected to the brake release duct via a device for limiting a flow rate of the fluid through said cooling duct. 14. A motor as claimed in claim 11, wherein the cooling duct is connected to the