Abstract: A diaphragm unit is arranged to be used in a loudspeaker including a frame. The diaphragm includes a diaphragm and an edge joined to an outer periphery of the diaphragm. The diaphragm extends in a longitudinal direction and has a first center line extends along the longitudinal direction. The edge has an outer periphery being arranged to join to the frame, and an inner periphery joined to the outer periphery of the diaphragm. The edge has a convex surface having substantially a semi-circular cross section. The convex surface of the edge has grooves provided therein. The grooves extend from the inner periphery of the edge to the outer periphery of the edge. The grooves have cross sections each having a U-shape or a V-shape, and are arranged symmetrically about the first center line of the diaphragm. This diaphragm unit provides an elongated loudspeaker reproducing bass sounds with small distortions.

Abstract: A waste heat utilization device includes a refrigeration cycle having a compressor, a Rankine cycle using a condenser in common with the refrigeration cycle, and a control unit which controls operation of the refrigeration cycle and the Rankine cycle. The control unit performs a continuation control of the Rankine cycle, in which the Rankine cycle is continuously operated regardless of an operation state of the compressor, when a load of the refrigeration cycle is lower than a predetermined load. In contrast, the control unit performs an intermittent control of the Rankine cycle, in which the Rankine cycle is intermittently operated in accordance with the operation state of the compressor such that the mechanical energy recovered by the expansion unit is larger than a driving energy of the compressor.

Abstract: In a refrigerating device comprising waste heat utilization equipment having: a refrigerating cycle 200 formed by sequentially connecting a compressor 210, a condenser 220, an expansion valve 240, and an evaporator 250; and a Rankine cycle 300 formed by sequentially connecting a heater 310 using the waste heat of a heat generating device (for example, an internal combustion engine) 10 as a heating source, an expansion device 320, the above-mentioned condenser 220, and a pump 330, in which the drive shafts of the compressor 210 and the expansion device 320 are separated from each other. Then, the output of the expansion device 320 is used mainly for generating electricity.

Abstract: A controller reduces a rotational speed of a Rankine cycle from a predetermined normal rotational speed during an operation of a compressor in a predetermined state when the controller determines that a predicted refrigerant flow quantity, which is predicted by assuming that the compressor is operated in a sole operation of the Rankine cycle at the predetermined normal rotational speed of the Rankine cycle, exceeds a predetermined flow quantity. The predetermined state is a state that satisfies a predetermined condition, which relates to the sole operation of the Rankine cycle.

Abstract: A vapor compression refrigerating apparatus comprises a refrigerating cycle for performing a cooling operation of an automotive air conditioning system, a Rankine cycle for collecting waste heat from an engine of a vehicle to generate an electric power by an electric rotating device driven by an expansion device of the Rankine cycle, and a heat pump cycle for generating heat to supply the generated heat to the engine so that a warming up operation of the engine can be facilitated.

Abstract: A power supply control system for a vehicle includes a supply line system, a first electric generating means, a second electric generating means, and a control means. The first electric generating means generates electricity through use of a mechanical drive force of a drive source of the vehicle, which drives the vehicle to run. The second electric generating means generates electricity through use of a heat energy. The first and second electric generating means are connected to the supply line system. The control means controls the first electric generating means and the second electric generating means.

Abstract: A pipe joint structure capable of reducing the joint height (H) and fabrication costs has a connection flange member provided with a through hole piercing the thickness of the flange member. A polygonal enlarged recess greater than the inner diameter of the through hole is formed at one end of the through hole. Meanwhile, an annular protrusion protruding radially outward is formed near an end of a pipe having an outer diameter capable of insertion into the through hole. This annular protrusion has an outer diameter greater than the incircle diameter of the polygonal enlarged recess. The annular protrusion is press-fitted and fixed to the polygonal enlarged recess.

Abstract: A waste heat recovery system of an engine has a cooling water circuit and a Rankine cycle. Cooling water is circulated between the engine and a radiator in the cooling water circuit. The Rankine cycle has a heater and an expansion device. The heater performs heat exchange between the cooling water heated by the engine and an operation fluid so as to heat the operation fluid in the Rankine cycle. The expansion device expands the heated operation fluid, so as to generate driving power. The heater is arranged in a bypass circuit so as to be in parallel with the radiator with respect to the cooling water flow. Thus, waste heat of the cooling water heated by the engine can be effectively recovered without reducing a cooling capacity of the radiator.

Abstract: A device for utilizing waste heat from a heat engine comprises a Rankine cycle including a pump, a heating device, an expansion device, and a condenser device, and a controller for controlling an operation of the Rankine cycle. The controller calculates an optimum heat collection amount (Qho) as a heat value to be collected from waste heat of the engine, wherein the heat collection amount (Qho) is calculated as an optimum amount in relation to a potential maximum heat radiation amount (Qco) to be radiated at the condenser device. The controller calculates an optimum flow amount (G) of refrigerant corresponding to the optimum heat collection amount (Qho), so that a maximum driving power (L) is generated at the expansion device.

Abstract: A loudspeaker includes a diaphragm, an edge, and a voice coil. The diaphragm includes a groove having a concave cross section. Also, the diaphragm is in a horizontally or vertically elongated shape. The edge is coupled to an outer circumference of the diaphragm, and has a roughly half-round shaped cross section. The voice coil is bonded to the groove. The voice coil is thicker than a depth of the groove. Also, the voice coil has a cross section in which a dimension in a direction along a plane of the diaphragm is longer than a dimension in a direction perpendicular to the plane of the diaphragm.

Abstract: In a refrigerating device comprising waste heat utilization equipment having: a refrigerating cycle 200 formed by sequentially connecting a compressor 210, a condenser 220, an expansion valve 240, and an evaporator 250; and a Rankine cycle 300 formed by sequentially connecting a heater 310 using the waste heat of a heat generating device (for example, an internal combustion engine) 10 as a heating source, an expansion device 320, the above-mentioned condenser 220, and a pump 330, in which the drive shafts of the compressor 210 and the expansion device 320 are separated from each other. Then, the output of the expansion device 320 is used mainly for generating electricity.

Abstract: A complex fluid machine has an expansion-compressor device, a pump, and a motor generator, wherein the expansion-compressor device, the pump, and the motor generator are operatively connected and arranged in series, and a power transmitting device for disconnecting the pump from the motor generator, when the expansion-compressor device is driven by the motor generator so as to be operated as a compressor device.

Abstract: A complex fluid machine has an expansion-compressor device, a pump, and a motor generator, wherein the expansion-compressor device, the pump, and the motor generator are operatively connected and arranged in series, and a power transmitting device for disconnecting the pump from the motor generator, when the expansion-compressor device is driven by the motor generator so as to be operated as a compressor device.

Abstract: A check valve is provided to each discharge port, which communicates between a corresponding working chamber and a high pressure chamber in an integrated compressor/expander apparatus. A valve mechanism, which is opened in a motor mode, is provided to communicate between the working chamber and the high pressure chamber.

Abstract: In an automotive vehicle having a heater for a heating operation for a passenger room of the vehicle with use of waste heat of an engine, a vapor compression refrigerating device comprises a refrigerating cycle for a cooling operation for the passenger room. The vapor compression refrigerating device further comprises a heating cycle (a heat pump cycle, or a hot gas cycle) for performing a heating operation to engine cooling water by using the high temperature and high pressure refrigerant from a compressor device, wherein a control means activates the heating cycle at a predetermined time before starting an engine when an outside air temperature is lower than a predetermined value. Accordingly, the engine has been already warmed up before a driver gets into the vehicle.

Abstract: A controller reduces a rotational speed of a Rankine cycle from a predetermined normal rotational speed during an operation of a compressor in a predetermined state when the controller determines that a predicted refrigerant flow quantity, which is predicted by assuming that the compressor is operated in a sole operation of the Rankine cycle at the predetermined normal rotational speed of the Rankine cycle, exceeds a predetermined flow quantity. The predetermined state is a state that satisfies a predetermined condition, which relates to the sole operation of the Rankine cycle.

Abstract: A waste heat utilization device includes a Rankine cycle in which an operation fluid circulates, and a control unit which controls an operation of the Rankine cycle. The Rankine cycle has a heater for heating the operation fluid using a waste fluid with a waste heat from a heat engine, an expander that expands the heated operation fluid to recover a mechanical energy, and a condenser for cooling and condensing the expanded operation fluid. The control unit operates the Rankine cycle when a waste fluid temperature is not less than a predetermined temperature and when the waste fluid is in a flowing state in the heat engine.

Abstract: An object of the invention is to provide a waste heat collecting system having an expansion device, in which an over expansion of refrigerant is prevented so that a loss to be caused by the over expansion is eliminated. A volume ratio of expansion for the expansion device is selected at a value, at which proper expansion of the refrigerant is achieved when the pressure difference between the high pressure and the low pressure is minimum.

Abstract: A waste heat utilization device includes a refrigeration cycle having a compressor, a Rankine cycle using a condenser in common with the refrigeration cycle, and a control unit which controls operation of the refrigeration cycle and the Rankine cycle. The control unit performs a continuation control of the Rankine cycle, in which the Rankine cycle is continuously operated regardless of an operation state of the compressor, when a load of the refrigeration cycle is lower than a predetermined load. In contrast, the control unit performs an intermittent control of the Rankine cycle, in which the Rankine cycle is intermittently operated in accordance with the operation state of the compressor such that the mechanical energy recovered by the expansion unit is larger than a driving energy of the compressor.