Abstract: A refrigerator of the present invention includes a Rankine cycle heat engine and a refrigeration cycle heat engine which share a condenser, and drives a compressor of the refrigeration cycle by an expander of the Rankine cycle. A screw expander and a screw compressor are set up within a common casing, and the exhaust side of a rotating shaft of the screw expander is connected to the discharge side of a rotating shaft of the screw compressor. Preferably, an intermediate space in which an exhaust passage of the screw expander and a discharge passage of the screw compressor are merged together and connected to a condenser, and a coupling which connects the rotating shaft of the screw expander to the rotating shaft of the screw compressor is housed is formed within the casing.

Abstract: In order to suppress the damage and the degradation in durability of a bearing of an expander, simplify the configuration of the expander, and reduce the manufacturing cost thereof, an expander of the present invention includes an expander rotor that is rotationally driven by an expanding force transmitted from vapor of a working medium introduced into an expansion chamber and a first bearing that supports a first rotation shaft of the expander rotor to a vapor inlet, a casing includes therein first bearing chambers that have a pressure lower than that of the vapor inlet and accommodate the first bearing, and a passage that leads lubricant to a low-pressure portion having a pressure lower than that of the first bearing chamber is connected to a position above the lowermost portion of the first bearing in the first bearing chamber.

Abstract: A power generation apparatus according to the present invention includes: an expander; a generator that includes a generator rotor driven by the expander and a stator disposed outside the generator rotor in the radial direction; and a casing that includes an expander chamber accommodating the expander and a generator chamber accommodating the generator. The casing includes a first communication portion that causes an expansion chamber which gradually expands a working medium by the expander in the expander chamber to communicate with a front generator portion which is located nearer the expansion chamber than the generator in the generator chamber and a second communication portion that causes a portion which is a downstream portion from the expansion chamber and is located near the expansion chamber with respect to the generator to communicate with the front generator portion.

Abstract: A power generation apparatus that suppress cavitation includes a first on/off valve provided between a steam generator and an expander in a circulating channel; a bypass channel connected between an area between the steam generator and the first on/off valve and an area between the expander and a condenser; a second on/off valve provided in the bypass channel; a third on/off valve provided between a pump and the steam generator; and a controller. When stopping the pump, the controller outputs a control signal that stops the pump, a control signal that closes the first on/off valve, a control signal that opens the second on/off valve, and a control signal that closes the third on/off valve. In the case where a predetermined condition has been met, the controller outputs a control signal that closes the second on/off valve.

Abstract: A screw expander in which a pair of male and female screw rotors engaged with each other are housed in a rotor chamber formed in a casing, an expansion force of a high-pressure gas supplied from an intake flow path to the rotor chamber is converted into a rotational force by the screw rotors and the expanded low-pressure gas is exhausted to an exhaust flow path includes a valve mechanism capable of allowing communication between an intermediate pressure portion, which is a space in the rotor chamber and can be separated from the intake flow path and the exhaust flow path by the screw rotors, and a bypass flow path, to which a high-pressure gas is supplied, and a controller for controlling the valve mechanism in accordance with an operation expansion ratio which is a ratio of a pressure in the intake flow path to a pressure in the exhaust flow path.

Abstract: A power generation apparatus of the present invention includes: a separation member that separates a lubricant from a fluid mixture flowing into an expander casing; an expander rotor that is rotationally driven by an expansion force applied from steam of a working medium from which the lubricant is separated; a power generator rotor that rotates with the rotation of the expander rotor; a first bearing holding portion that accommodates a first bearing supporting a first rotation shaft of the expander rotor; a second bearing holding portion that accommodates a second bearing supporting a second rotation shaft of the expander rotor; and a lubricant supply path which connects a lubricant accumulation position inside the expander casing to both inner spaces of the first bearing holding portion and the second bearing holding portion of which the pressures are lower than the pressure of the lubricant accumulation position inside the expander casing.

Abstract: In a power generation apparatus, a working medium is evaporated in an evaporator using a heating medium supplied from outside, and the evaporated working medium is subsequently introduced into an expander, which is connected to an electric generator, to convert a thermal expansion force of the working medium into a rotation force inside the expander for generation of electric power. Then, the working medium exhausted from the expander is fed into a condenser in which the working medium is condensed by cooling the working medium with a coolant medium supplied from outside, and the condensed working medium is pressurized by a circulating pump to resupply the evaporator with the pressurized working medium. In the power generation apparatus, when a condensing pressure in the condenser is high, a rotational speed of the circulating pump and a suction volume of the evaporator are increased.

Abstract: A screw compressor includes a pair of rotors housed in a rotor chamber. A gas sucked from an intake channel is compressed by the screw rotors and discharged from a discharge channel. A columnar space having a functional end face with an opening into an intermediate pressure section, which is an empty space in the rotor chamber and isolatable from both the intake channel and the discharge channel by the screw rotors. The functional end face has an opening into a bypass channel in communication with the discharge channel. A piston, inserted in the columnar space and brought into contact with the functional end face, separates the intermediate pressure section from the bypass channel when the piston contacts the functional end face. A pressure detection channel allows an area located on an opposite side of the functional end face in the columnar space to communicate with the discharge channel.

Abstract: A hermetically sealed compressor in which heat generation and insulation breakdown are hardly to occur at the connection portion between a lead wire of a motor and an external terminal is configured as follows. The compressor main body and the motor are integrally structured. The flow path of a fluid to be compressed is communicated with the internal space of the motor. The stator (10) of the motor is formed by winding each of a plurality of independent coils (A1, A2, B1, B2, C1, C2) in multiple turns. Each of the coils (A1, A2, B1, B2, C1, C2) is provided with a separate external terminal (18).

Abstract: In a power generation apparatus, a working medium is evaporated in an evaporator using a heating medium supplied from outside, and the evaporated working medium is subsequently introduced into an expander, which is connected to an electric generator, to convert a thermal expansion force of the working medium into a rotation force inside the expander for generation of electric power. Then, the working medium exhausted from the expander is fed into a condenser in which the working medium is condensed by cooling the working medium with a coolant medium supplied from outside, and the condensed working medium is pressurized by a circulating pump to resupply the evaporator with the pressurized working medium. In the power generation apparatus, when a condensing pressure in the condenser is high, a rotational speed of the circulating pump and a suction volume of the evaporator are increased.

Abstract: A power generation apparatus that suppress cavitation includes a first on/off valve provided between a steam generator and an expander in a circulating channel; a bypass channel connected between an area between the steam generator and the first on/off valve and an area between the expander and a condenser; a second on/off valve provided in the bypass channel; a third on/off valve provided between a pump and the steam generator; and a controller. When stopping the pump, the controller outputs a control signal that stops the pump, a control signal that closes the first on/off valve, a control signal that opens the second on/off valve, and a control signal that closes the third on/off valve. In the case where a predetermined condition has been met, the controller outputs a control signal that closes the second on/off valve.

Abstract: There is provided a two-stage screw compressor including a first-stage compressor that compresses a fluid, a second-stage compressor that further compresses the fluid compressed by the first-stage compressor, a motor that drives the first-stage compressor and the second-stage compressor, and a box body that serves as a flow passage connecting an outlet of the first-stage compressor and an inlet of the second-stage compressor, and also forms a connection space storing a transmission mechanism for transmitting a rotation force from the motor to the first-stage compressor and to the second-stage compressor, wherein the connection space is sealed by the casing of the motor, and the connection space and an internal space of the casing of the motor communicate with each other.

Abstract: A screw compressor includes a pair of rotors housed in a rotor chamber. A gas sucked from an intake channel is compressed by the screw rotors and discharged from a discharge channel. A columnar space having a functional end face with an opening into an intermediate pressure section, which is an empty space in the rotor chamber and isolatable from both the intake channel and the discharge channel by the screw rotors. The functional end face has an opening into a bypass channel in communication with the discharge channel. A piston, inserted in the columnar space and brought into contact with the functional end face, separates the intermediate pressure section from the bypass channel when the piston contacts the functional end face. A pressure detection channel allows an area located on an opposite side of the functional end face in the columnar space to communicate with the discharge channel.

Abstract: A refrigerator of the present invention includes a Rankine cycle heat engine and a refrigeration cycle heat engine which share a condenser, and drives a compressor of the refrigeration cycle by an expander of the Rankine cycle. A screw expander and a screw compressor are set up within a common casing, and the exhaust side of a rotating shaft of the screw expander is connected to the discharge side of a rotating shaft of the screw compressor. Preferably, an intermediate space in which an exhaust passage of the screw expander and a discharge passage of the screw compressor are merged together and connected to a condenser, and a coupling which connects the rotating shaft of the screw expander to the rotating shaft of the screw compressor is housed is formed within the casing.

Abstract: A screw expander in which a pair of male and female screw rotors engaged with each other are housed in a rotor chamber formed in a casing, an expansion force of a high-pressure gas supplied from an intake flow path to the rotor chamber is converted into a rotational force by the screw rotors and the expanded low-pressure gas is exhausted to an exhaust flow path includes a valve mechanism capable of allowing communication between an intermediate pressure portion, which is a space in the rotor chamber and can be separated from the intake flow path and the exhaust flow path by the screw rotors, and a bypass flow path, to which a high-pressure gas is supplied, and a controller for controlling the valve mechanism in accordance with an operation expansion ratio which is a ratio of a pressure in the intake flow path to a pressure in the exhaust flow path.

Abstract: In a motor, one ends of a plurality of electric wires with the other ends connected to the motor side are connected to a terminal rod, and the terminal rod is exposed to the exterior of a motor casing via a terminal base. The terminal rod is provided with a flange portion and a crimping portion. A concave part is formed on an end surface of the crimping portion, and a communication part providing communication between an outer surface and the concave part is formed. The terminal base is provided with a depression to be fitted to the flange portion of the terminal rod, a seal portion having a diameter reduced from the depression, and a through portion passing from the seal portion through to the exterior of the motor casing. A seal member is put on the terminal rod. In a state that the electric wires are inserted into the concave part of the crimping portion, the outer surface of the crimping portion is pressurized, so that the electric wires are fixed to the crimping portion.

Abstract: In a refrigerating device comprising: a compressor that is driven by a motor; a refrigerant circulation flow passage that includes an oil separator/collector, a condenser, an expansion valve, and an evaporator; and an oil flow passage that conducts oil in the oil separator/collector to a bearing of the compressor, an oil supply opening is provided for a motor casing that stores the motor, an oil supply line for supplying oil from an oil sump of the refrigerant circulation flow passage on the discharge side of the compressor to the oil supply opening is provided, oil is supplied to the oil supply opening through the oil supply line, and oil is distributed across surfaces of windings of the motor. And an internal pressure of the motor casing is lower than a pressure in the oil sump in the refrigerant circulation flow passage on the discharge side of the compressor, consequently oil is easily distributed across the entire motor casing.

Abstract: In a motor, one ends of a plurality of electric wires with the other ends connected to the motor side are connected to a terminal rod, and the terminal rod is exposed to the exterior of a motor casing via a terminal base. The terminal rod is provided with a flange portion and a crimping portion. A concave part is formed on an end surface of the crimping portion, and a communication part providing communication between an outer surface and the concave part is formed. The terminal base is provided with a depression to be fitted to the flange portion of the terminal rod, a seal portion having a diameter reduced from the depression, and a through portion passing from the seal portion through to the exterior of the motor casing. A seal member is put on the terminal rod. In a state that the electric wires are inserted into the concave part of the crimping portion, the outer surface of the crimping portion is pressurized, so that the electric wires are fixed to the crimping portion.

Abstract: 1. In a refrigerating device comprising: a compressor that is driven by a motor; a refrigerant circulation flow passage that includes an oil separator/collector, a condenser, an expansion valve, and an evaporator; and an oil flow passage that conducts oil in the oil separator/collector to a bearing of the compressor, an oil supply opening is provided for a motor casing that stores the motor, an oil supply line for supplying oil from an oil sump of the refrigerant circulation flow passage on the discharge side of the compressor to the oil supply opening is provided, oil is supplied to the oil supply opening through the oil supply line, and oil is distributed across surfaces of windings of the motor. And an internal pressure of the motor casing is lower than a pressure in the oil sump in the refrigerant circulation flow passage on the discharge side of the compressor, consequently oil is easily distributed across the entire motor casing.

Abstract: There is provided a two-stage screw compressor including a first-stage compressor that compresses a fluid, a second-stage compressor that further compresses the fluid compressed by the first-stage compressor, a motor that drives the first-stage compressor and the second-stage compressor, and a box body that serves as a flow passage connecting an outlet of the first-stage compressor and an inlet of the second-stage compressor, and also forms a connection space storing a transmission mechanism for transmitting a rotation force from the motor to the first-stage compressor and to the second-stage compressor, wherein the connection space is sealed by the casing of the motor, and the connection space and an internal space of the casing of the motor communicate with each other.