摘要:
Provided is a two-stage compression heat pump with which the amount of refrigerant oil in the two compressors is easily kept uniform. The system is provided with: a compression mechanism (10) provided with a lower stage-side compressor (10a) and a higher stage-side compressor (10b), for compressing and discharging a refrigerant; a water-refrigerant heat exchanger (11) for heat exchange between a target to undergo heat exchange and the refrigerant compressed by the compression mechanism (10); an expansion valve (12) for decompression and expansion of the refrigerant outflowing from the water-refrigerant heat exchanger (11); a heat source-side heat exchanger (13) for heat exchange between a target to undergo heat exchange and the refrigerant decompressed and expanded by the expansion valve (12); an oil equalizing mechanism (20) connecting the lower stage-side compressor (10a) and the higher stage-side compressor (10b), through which a refrigerant oil flows; and a four-way switching valve (14) for selectively switching between a two-stage compression path in which the refrigerant flows in order to the lower stage-side compressor (10a) and the higher stage-side compressor (10b), and a one-stage compression path in which it flows either to the lower stage-side compressor (10a) or the higher stage-side compressor (10b) only.
摘要:
A power generation system (20A) includes a medium circuit (22) through which a medium is circulated; a circulation pump (23); an evaporator (25) configured to heat the pressurized medium using heat of an external source so as to evaporate the medium, wherein the external source that the heat quantity is capable of fluctuating; an expander (26) configured to be driven using the medium evaporated by the evaporator (25); a generator (28) configured to be driven using the expander (26) to generate power; and a flow rate control device (35) configured to control the flow rate of the medium flowing into the expander (26) such that, even when the heat quantity of the external source has fluctuated, the number of rotations of the expander (26) or the generator (28) is within a region in which the number of rotations is preset.
摘要:
A scroll compressor having an improved compression efficiency by optimizing a step mesh gap in an operating state is provided. The scroll compressor having a step-like shape has a step-mesh-gap set value (Hf) occurring between step side surfaces of a connecting wall 12h of a fixed scroll 12 and a connecting edge 13e of a revolving scroll 13 and a step-mesh-gap set value (H0) occurring between step side surfaces of a connecting wall 13h of the revolving scroll 13 and a connecting edge 12e of the fixed scroll 12, and a fixed-side set value (Hf in the example shown in the drawing) for when the two move close together due to the revolving scroll tilting by receiving gas pressure during operation is set greater than that (H0 in the example shown in the drawing) for when the two move apart.
摘要:
An injection pipe (17) that supplies a compressor (3) with a gas refrigerant subjected to gas/liquid separation by a receiver, which separates the reduced-pressure refrigerant into gas and liquid, or a gas refrigerant gasified by a heat exchanger, wherein a muffler (19) having an inside diameter larger than the inside diameter of the injection pipe (17) is provided at an end located at the compressor (3) side. This can reduce pulsation caused by a refrigerant flowing back from the compressor, which can reduce vibration and noise due to the pulsation, thereby preventing the pipe from being damaged by the vibration.
摘要:
This power generation system includes a first on-off valve (40A) that, with respect to a maintenance target device including at least one among a circulation pump (23), an evaporator (25), an expander (26), and a condenser (27) that are provided in a medium circuit (22) through which a medium with a boiling point lower than that of water circulates, is provided on the upstream side in a flow direction of the medium in the medium circuit (22), and is capable of shutting off the flow of the medium; a second on-off valve (40B) that is provided on the downstream side in the flow direction of the medium in the medium circuit (22), and is capable of shutting off the flow of the medium; a port (42) that is communicable with the medium circuit (22) between the first on-off valve (40A) and the second on-off valve (40B); and a third on-off valve (43) that is provided in the port (42).
摘要:
Provided is a rotary fluid machine in which the irregular contact of a crankshaft with a bearing can be reduced by reducing the deflection of an intermediate shaft. A crankshaft (1) is provided with a first crankshaft section (3), a first crank pin (5), a second crankshaft section (11), a second crank pin (9), and an intermediate shaft (7), wherein the intermediate shaft (7) has a shape in which the intermediate shaft (7) has a first side which is located on the first direction (A) side in a longitudinal cross-section which includes the axes of any two of the first crankshaft section (3), the first crank pin (5), and the second crank pin (9), the first side (X) is provided so as to continuously connect a first side-side first connection point which is connected to the first crank pin (5) and a first side-side second connection point which is connected to the second crank pin (9), and the first side-side first connection point is provided at a position displaced further in the first direction (A) than the first side-side second connection point.