摘要:
An internal intermediate pressure 2-stage compression type rotary compressor (10), which comprises an electrically-driven element (14) in a closed vessel (12), and first and second rotary compression elements (32, 34) driven by the electrically-driven element (14), wherein CO2 coolant gas subjected to first-stage compression by the first rotary compression element (32) is discharged into the closed vessel (12) and the discharged coolant gas of intermediate pressure is passed through an accumulator (106) and subjected to second-stage compression by the second rotary compression element (34), the rotary compression elements (32, 34) comprising upper and lower cylinders (38, 40), upper and lower rollers (46, 48) eccentrically rotating within the cylinders, upper and lower vanes (50, 52) contacting the rollers and partitioning the upper and lower cylinders into higher and lower pressure chambers, the volume ratio of the upper and lower cylinders (38, 40) for first and second stage compression being set at 1 : 0.65 so that the equilibrium pressure and the intermediate pressure are equal. Since the pressure variation at the start of operation is low, oil forming is suppressed and the pressure vessel is easy to design and can be reduced in weight.
摘要:
A multi-stage compression refrigerating device, wherein refrigerant delivered from a condenser (1) is divided so as to feed one refrigerant from first decompression means (3) to a first intermediate cooler (6) and the other refrigerant from second decompression means (7) to an evaporator (8), refrigerant flowing into the second decompression means (7) is heat-exchanged with the first intermediate cooler (6), refrigerant delivered from the evaporator (8) is sucked into low stage compression means (32) and, after refrigerant delivered from the first intermediate cooler (6) is merged into the refrigerant delivered from the low stage compression means (32), the merged refrigerant is sucked into high stage compression means (34), the displacement volume of the low stage compression means (32) being set at a value larger than the displacement volume of the high stage compression means (34), a one-way valve (9) allowing refrigerant to flow only from the first intermediate cooler (6) in the direction of a merged point (106) being provided between the first intermediate cooler (6) and the merged point (106), whereby the delivery gas refrigerant temperature of the high stage compression means (34) can be suppressed, and a time required until a circuit is stabilized at the beginning of starting of the refrigerating device can be reduced so as to increase an efficiency.
摘要:
A multistage compressor, wherein the refrigerant compressed by a pre-stage compression element (30) is delivered from a noise reducing chamber (35) into an enclosed container (10), led to a post-stage compression element (40) through a post-stage side connection pipe (16) while cooling a motor (20), and delivered to the outside of the compressor after compressed by the post-stage compression element (40), whereby the motor (20) can be cooled with a simple structure.
摘要:
A closed motor-driven compressor (10) wherein a rotary compression element (18) using CO2 as a refrigerant and driven by a motor element (14) and a rotary shaft (16) connected to the motor element (14) is disposed in a closed vessel (12) storing lubricating oil in the bottom, the lubricating oil being fed to the slide portions in bearings, in upper and lower eccentric portions (38, 40) provided on the rotary shaft (16), and in upper and lower rollers (42, 44), via an oil hole (60) formed in the rotary shaft (16), oil supply holes (62, 64) and spiral oil grooves (66, 68), the lubricating oil being polyalkylene glycol type oil (PAG oil) (82) with low solubility in CO2 and high viscosity. PAG oil is low in solubility in CO2 and is capable of suppressing the decrease of efficiency due to the decrease of oil viscosity and also suppressing the outflow of oil into piping, and an increase in input is prevented from occurring.
摘要:
A multi-stage compression refrigerating device, comprising low stage compression means (32) and high stage compression means (34), a condenser (1), first decompression means (3), an intermediate cooler (6), second decompression means (7), and an evaporator (8), wherein refrigerant delivered from the condenser (1) is divided so as to feed one refrigerant from the first decompression means (3) to the intermediate cooler (6) and the other refrigerant from the second decompression means (7) to the evaporator (8), refrigerant flowing into the second decompression means (7) is heat-exchanged with the intermediate cooler (6), refrigerant delivered from the evaporator (8) is sucked into low stage compression means (32), and refrigerant delivered from the intermediate cooler (6) is sucked into high stage compression means (34) together with refrigerant delivered from low stage compression means (32), a second intermediate cooler (5) being provided between the evaporator (8) and the low stage compression means (32), the other refrigerant heat-exchanged with the second intermediate cooler (5) being heat-exchanged with the intermediate cooler (6), whereby the delivery gas refrigerant temperature of the high stage compression means can be suppressed, and refrigerating effects of the refrigerating device at the beginning of starting can be increased to improve the efficiency.
摘要:
A 2-cylinder, 2-stage compression type rotary compressor of internal intermediate pressure type, comprising an electric motor part (14) stored in a closed container (12) and upper and lower cylinders (40) and (42) driven by the rotating shaft (16) of the electric motor part (14), wherein upper and lower rollers (48) and (50) fitted to upper and lower eccentric cams (44) and (46) provided on the rotating shaft (16) are rotated eccentrically in the cylinders, the insides of the cylinders are partitioned through upper and lower vanes (52) and (54), and a low-stage side compression part and a high-stage side compression part sucking and compressing refrigerant gas are provided and an intermediate partition plate (38) having an inner diameter hole (36) formed therein allowing the rotating shaft (16) to be inserted is provided between these compression parts, and the center of an inner diameter hole (36a) in the intermediate partition plate facing the upper roller is shifted to 90±45° in the rotating direction of the rotating shaft (16) relative to the center of the rotating shaft and on the basis of the position of the upper vane and the center of the inner diameter hole (36b) in the intermediate partition plate facing the lower roller is shifted to 270 to 360° in the rotating direction of the rotating shaft (16) for setting the intermediate plate, whereby the overlapped area of the upper and lower rollers and the intermediate partition plate can be increased at a portion where a pressure difference is increased and the leaked gas amount can be reduced so as to increase a volume efficiency and a compression efficiency.