Abstract: A compressor includes a casing that stores a lubrication oil in a bottom portion, a compression mechanism disposed in the casing, an electric motor disposed above the compression mechanism, a discharge pipe opening in a space in the casing on an upper side of the motor, and an oil drainage mechanism that guides a lubrication oil adhering to an inner wall of the casing to the discharge pipe using a swirling flow generated by rotation of the motor. The oil drainage mechanism includes an oil drain pipe having one end opening in the inner wall of the casing and another end connected to the discharge pipe, and a flow-rate regulating valve disposed at the oil drain pipe. The flow-rate regulating valve has a changeable opening degree. The opening degree of the flow-rate regulating valve is configured to be regulated in accordance with a rotational speed of the motor.

Abstract: The invention relates to a scroll compressor for compressing a fluid, comprising a compression section with an inlet for sucking the fluid into the compression section, an outlet for discharging the compressed fluid out of the compression section, a stationary disk having a stationary spiral, and an orbiting disk having an orbiting spiral. The orbiting disk is orbitable relative to the stationary disk to move the fluid from the inlet to the outlet and to compress it thereby. The scroll compressor comprises an oil separator for separating oil from the compressed fluid and a direct oil return for directly returning oil from the oil separator to the compression section, the direct oil return comprising at least one orifice opening. For enabling efficient operation, the direct oil return comprises an outgassing chamber arranged between the first flow valve and the orifice opening and a fluid return for returning fluid from the outgassing chamber to the compression section.

Abstract: A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a first compressor having a first capacity, a second compressor having a second capacity, a condenser, an expansion device, and an evaporator fluidly connected. The first compressor and the second compressor are arranged in parallel. The first compressor includes a first lubricant sump. The second compressor includes a second lubricant sump. The first lubricant sump is fluidly connected to the second lubricant sump via a lubricant transfer conduit. A flow restrictor is disposed in the lubricant transfer conduit. The flow restrictor is configured to reduce a refrigerant flow between the first compressor and the second compressor.

Abstract: A refrigeration apparatus includes a compressor connected to a refrigerant circuit, and a bearing monitor. The compressor includes a compression mechanism, an electric motor, a drive shaft, and a plain bearing that supports a journal portion of the drive shaft. The bearing monitor performs an abnormal-state operation to cope with poor lubrication on the plain bearing if an abnormal state condition is satisfied. The abnormal state condition is a condition indicating that a rate of change of current exceeds a first reference value. The rate of change of current is an amount of change in a driving current usable to drive the compressor per unit time. The journal portion of the drive shaft has a surface roughness of at least 0.05 ?m.

Abstract: Disclosed herein is a motor including a shaft, a rotor, a motor housing forming an inner space to receive the shaft and the rotor therein, a stator received in the motor housing and disposed outside the rotor based on a radial direction of the shaft, a first flow path disposed outside the stator based on the radial direction of the shaft such that a first fluid flows in the first flow path, the first fluid being discharged to the inner space and cooling the stator and the rotor, and a second flow path disposed between the first flow path and the stator based on the radial direction of the shaft such that a second fluid flows in the second flow path, the second fluid absorbing heat of the stator transferred through a flow path wall.

Abstract: A screw compressor, refrigerant circuit, lubrication method are disclosed. The screw compressor includes a suction inlet that receives a working fluid to be compressed. A compression mechanism is fluidly connected to the suction inlet. A discharge outlet is fluidly connected to the compression mechanism that outputs the working fluid following compression by the compression mechanism. The screw compressor includes a slide valve that is movable between a first position and a second position. The first position corresponds to a high volume ratio and the second position corresponds to a low volume ratio. The slide valve includes a plurality of lubricant passageways selectively connectable to a lubricant source. A first of the plurality of lubricant passageways is configured to be selected to provide lubricant at the high volume ratio, and a second of the plurality of lubricant passageways is configured to be selected to provide lubricant at the low volume ratio.

Abstract: An e-charger includes an outer housing and a rotor supported for rotation within the outer housing. A motor assembly is housed within the outer housing and includes an electric motor and a motor case. The electric motor is encased within the motor case. The electric motor is configured to drivingly rotate the rotor within the outer housing. Furthermore, the e-charger includes a cooling system configured to receive a coolant. The cooling system includes a manifold passage defined in the outer housing. The cooling system includes a first motor cooling circuit and a second motor cooling circuit that are cooperatively defined by the outer housing and the motor case. The first motor cooling circuit and the second motor cooling circuit are fluidly connected to the manifold passage. The manifold passage is configured to distribute a flow of the coolant between the first motor cooling circuit and the second motor cooling circuit.

Abstract: An oil-cooled screw compressor includes a controller having an arithmetic operation section for arithmetically determining a remaining moisture amount Dr from at least a suction temperature Ts, a suction pressure Ps, a discharge temperature Td, and a discharge pressure Pd, an inverter control section for comparing a first rotational speed of a motor at which the remaining moisture amount Dr becomes the target moisture amount and a second rotational speed of the motor at which a discharge pressure Pd becomes the target pressure, and for controlling an inverter so as to drive the motor at the larger one of the first and second rotational speeds, and an air release valve control section for opening an air release valve while the discharge pressure Pd exceeds an air release pressure when the motor is driven at the first rotational speed.

Abstract: A method of operating an internal combustion engine comprising a cylinder and a piston, the method including injecting into the cylinder, as a liquid, a fuel which has been condensed into its liquid phase via a refrigeration process, such that the fuel vaporises into its gaseous phase during a compression stroke of the piston and before combustion such that a rise in temperature caused by the compression stroke is limited by the absorption of heat by the fuel.

Abstract: The present invention relates to a system and to a method for storing energy in form of compressed air, having an assembly of connected tubes forming a storage volume, which are confined in a pressure-resistant thermally-insulating tank. The storage system according to the invention comprises a system for storing and releasing the heat of the compressed air to increase the storage system efficiency.

Abstract: The present invention relates to a refrigerator and a method for controlling a refrigerator, and more particularly to a refrigerator and a method for controlling a refrigerator in which unnecessary operation of a compressor is prevented for saving power consumption of the refrigerator. The refrigerator includes a compressor, a refrigerating chamber evaporator and a freezing chamber evaporator connected to the compressor, a refrigerant valve for guiding refrigerant to the refrigerating chamber evaporator or the freezing chamber evaporator, and a control unit for controlling the refrigerant valve such that the refrigerant valve blocks or introduces the refrigerant to cause an inside pressure of the freezing chamber evaporator to be elevated higher than an inside pressure of the refrigerating chamber evaporator during evaporation at the refrigerating chamber evaporator for the compressor to draw in the refrigerant remained in the freezing chamber evaporator which did not evaporate.

Abstract: Crankcase ventilation filter systems are described, along with components and selected features thereof. Example features include preferred use of a backpressure limiting valve regulation (regulator) arrangement; and, a vacuum limiting valve regulation (regulator) arrangement. An example embodiment is provided which use two filter cartridges and two drain arrangements. Another example is provided which uses a single cartridge. Example filter cartridges are depicted and described.

Abstract: An engine lubricating oil supply device (1) according to the present invention is configured such that a connection hole (45) is opened and closed by a ball valve element (53) based on a balance between a biasing force of a shape memory spring (51) which changes in accordance with the temperature of the lubricating oil and a hydraulic pressure of the lubricating oil flowing into a piston chamber (31) such that the lubricating oil flowing into an accommodating space (44) from the connection hole (45) is drained via a second drain oil passage (46), thereby adjusting the degree of opening of a first drain oil passage (34) by causing a piston (35) to slide on the basis of a balance between a biasing force of a valve spring (39) and a pressure differential between an upstream chamber (32) and a downstream chamber (33) which is generated in accordance with a flow of the lubricating oil passing through an orifice (38).

Abstract: A device for the pulsed release of an amount of fluid stored in a storage housing (2) has a locking device (7) formed by a piston-cylinder arrangement (8). The arrangement has a cylinder housing (9) subdivided into a first working chamber (11) and a second working chamber (12) by a working piston (10). An electrorheological or magnetorheological valve (14) in the form of a gap (15) or an opening is arranged between the working chambers (11, 12) in the circumference (13) of the working piston (10) or in the working piston (10).

Abstract: An apparatus circulates a coolant in a turbocharger, which includes a first coolant line for supplying the coolant to the turbocharger from a water pump and configured to form a first flow resistance member to increase flow resistance to the coolant flowing through the first coolant line.

Abstract: A pump has a pressure chamber and a control ring which is mounted to pivot about a pivoting axis and which undergoes a pivoting motion. The control ring can be pivoted about a deflection angle during its pivoting movement. An aperture is provided in the pressure chamber of the pump. The aperture opens or closes to varying degree based on the pivoting motion of the control ring. In a hydrodynamic retarder with such a pump, a lubricating and cooling medium is supplied at least to bearings of rotating components of the retarder. Differentiated lubrication and cooling, at least of the bearings, can be brought about during braking operation and during non-braking operation of the retarder.

Abstract: An air compressor with oil pump inlet strainer bypass features, including a bypass valve assembly in fluid communication with the air compressor crankcase to provide lubricating oil to the dynamic compressor components, or simply to the air compressor. The bypass valve assembly includes a valve housing defining an interior chamber and an oil strainer screen engaged with the valve housing to filter the lubricating oil entering the interior chamber. A bypass valve is in fluid communication with the interior chamber and includes a valve body having a bypass port and an indicator port. An optional suction tube is connected to the bypass port on the valve body. An indicator assembly is connected to the indicator port on the valve body.

Abstract: Disclosed compressor embodiments can prevent or substantially reduce the inefficient upwardly spiraling heat buildup found in typical compressors by significantly increasing the surface area of mating piston and chamber walls, using the meshing and undulating geometry of the piston/chamber walls to create increased air turbulence in the chamber and generate more air flow against the cooling walls, promoting turbulence even more by varying the axial path of the piston head so that it is not simply linear, using fluid to cool the non-working side of the piston, and/or providing additional cooling features (such as fins) on the non-working side of the piston to provide still further cooling means for the piston head. Analogous principles can also be included in wobble-plate compressors, scroll compressors, blowers, and other compressor types.

Abstract: A dry running gas compressor has at least a first compression unit with a housing and a first working chamber in which gas is compressed. A hollow of said first working chamber is in said housing. A closed cooling liquid circuit is adapted for cooling the first working chamber of the first compression unit. The compression unit has at least one lubricant channel through which lubricant is guided to a bearing or gearbox or other component of the first compression unit. The lubricant channel is part of a lubricant circuit. The lubricant circuit is effectively fluidly separated from the cooling circuit.

Abstract: In order to prevent working medium from accumulating in the compressor housing (2) of a piston compressor (1) in a simple manner by means of a sealing of the piston rod (7) in the form of sealing medium barrier supplied by a hydraulic unit (12), it is provided that a ventilator (32) and a sealing medium container (37), which is partially filled with sealing medium, are provided in the hydraulic unit (12), wherein the ventilator (32) suctions air from the free space of the sealing medium container (37). and the free space (45) in the sealing medium container (37) is connected via a line (15, 17) to the compressor housing (2), and an opening (16) is provided at the compressor housing (2) for connecting the interior of the compressor housing (2) to a purge gas reservoir (18).

Abstract: A first switching device includes a first and second inputs connected to first and second power lines, respectively, the first and second power lines for receiving a first voltage. The first switching device selectively connects and disconnects the first and second inputs to and from first and second nodes, respectively. A second switching device includes a third input connected to the first node, includes a fourth input connected to a third power line, and includes a first output connected to a first end of a stator winding. A third switching device includes a fifth input connected to the second node and includes a sixth input connected to a fourth power line, the third and fourth power lines for receiving a second voltage that is less than the first voltage. The third switching device further includes a second output connected to a second end of the stator winding. A compressor crankcase heating control module controls the second and third switching devices to control compressor crankcase heating.

Abstract: The invention discloses a fracturing pump, comprising a cooling device and a control device, wherein a motor is connected on an shaft of the fracturing pump, the cooling device comprises an air-cooled device for cooling a rotor of the motor and a water-cooled device for cooling a stator of the motor, and the control device is connected with the motor and the cooling device, respectively. The fracturing pump in the invention adopts a structure directly driven by the motor, thus breaking the form of a transmission structure of a diesel engine of the conventional fracturing pump added with a transmission tank, simplifying the structure of the entire fracturing pump, reducing the apparatus mounted on a fracturing car, decreasing failure rate of the apparatus, and becoming more safe and reliable.

Abstract: A reciprocating compressor is provided. The reciprocating compressor may include a cylinder having a compression space, a piston inserted into the cylinder to define the compression space while being reciprocated, the piston having a suction passage to communicate with the compression space, a gas bearing having at least one bearing hole that passes through the cylinder, so that a refrigerant gas may be injected between the cylinder and the piston to support the piston with respect to the cylinder, and a flow resister disposed at an outer circumferential surface of the cylinder or at one side of the cylinder to restrict a flow of the refrigerant gas flowing through or toward the at least one bearing hole.

Abstract: The present invention disclosures an oil balance device and a method for performing an oil balance operation between a plurality of compressor units, which are suitable for air conditioner units comprising at least two parallel connected compressor units. Each compressor unit comprises at least one parallel connected compressors. The oil balance device comprises an oil reservoir, a first pipe, a second pipe, a third pipe and a fourth pipe. The four pipes communicate with the oil reservoir respectively. Each pipe is provided with at least one valve to control the opening and the closing of the corresponding pipe.

Abstract: An oil balancing apparatus is for use with a first compressor and at least two second compressors. Suction pipes of the first compressor and the second compressors are connected in parallel to a suction main pipe and discharge pipes of the first compressor and the second compressors are connected in parallel to a discharge main pipe. The first compressor is in an operating state, and the second compressors are operated intermittently. The oil balancing apparatus includes a first oil balancing pipe connecting oil sumps of the second compressors in series, and a second oil balancing pipe connecting an oil sump of the first compressor to a bottom of the first oil balancing pipe. A refrigeration system is also disclosed.

Abstract: Compressor device that comprises a compressor element that is equipped with a compression chamber with at least one coolant inlet, and which furthermore comprises a gas outlet, a gas/coolant separation tank connected to it, and, a cooling circuit with a cooler that extends between the separation tank and the coolant inlet, and which is equipped with control means to adjust the temperature of the coolant flow supplied to the compressor element, whereby the aforementioned control means comprise a first and a second sub-controller, each with a different target parameter, whereby the control means also comprise switching means to place one of the two sub-controllers in an activated state and the other sub-controller in a deactivated state.

Abstract: In a control valve, the spring load of a spring, which biases a main valve element in a valve opening direction, is regulated, for instance. This allows a range of suction pressures Ps, where a main valve and a sub-valve are simultaneously closed until a sub-valve element is lifted from a sub-valve seat after a main valve element has been seated on a main valve seat, to be set as a deadband. The control valve is configured such that the value of a suction pressure Ps with which to open the sub-valve after the closing of the main valve and the pressure values at which the deadband takes place are set variably by the setting of a value of current supplied to the solenoid.

Abstract: A lubrication apparatus of a high pressure pump for a common rail system is configured such that a sufficient amount of lubrication fuel can be supplied from a low pressure pump to the frictional junction between a roller and a shoe within a short period of time, thereby efficiently improving the lubrication performance of the frictional junction.

Abstract: A compression and expansion system includes a pressure vessel having a variable volume working chamber therein. The pressure vessel has a conduit through which at least one fluid can be introduced into and discharged from the working chamber. The system further includes a heat transfer element disposed within the working chamber and including a layer and at least one of a fin and a spacing element. The pressure vessel is operable to compress fluid introduced into the working chamber such that heat energy is transferred from the compressed fluid to the heat transfer element, and is further operable to expand fluid introduced into the working chamber such that heat energy is transferred from the heat transfer element to the expanded fluid.

Abstract: The invention relates to a method for controlling the water supply of a water-injected compressor, into the cooling water circuit of which is injected demineralized and non-demineralized water as fresh water. The method according to the invention is characterized in that the fresh water supplied is a mixture of demineralized and non-demineralized water, and the proportions of the demineralized and non-demineralized water in the fresh water are dependent on the conductivity of the demineralized and non-demineralized water. The invention also relates to a water-injected gas compressor that may be operated with such a method.

Abstract: A regulatable coolant pump of an internal combustion engine having a pump housing in which a pump shaft with an associated impeller is rotatably mounted. The impeller conveys a coolant from an inlet connection into an outlet of the coolant pump, a volume flow of the coolant pump being adjustable by a cover that externally surrounds the impeller at least in some regions and is displaceable by a pressure medium. The cover is moved by an actuator including a solenoid in contact with a piston that is moveable into a piston pressure chamber in order to generate high pressure pulses of a pressure medium that are transmitted to a plunger chamber where they act on a plunger connected to the cover. Upon actuation of the solenoid, the cover is moved by the pressure medium acting on the plunger to an actuated end position.

Abstract: An oil-flooded screw compressor drives a pair of rotors at a rotational speed which is low enough not to increase torque for a short amount of time after start-up and accelerates the pair of rotors up to a normal-operation rotational speed after oil discharge. Alternatively, the oil-flooded screw compressor rotates the pair of rotors for a short amount of time after the remaining compressed gas is discharged after a halt, thereby allowing the oil accumulated inside the working chambers to be discharged and ensuring smooth start-up after the halt.

Abstract: A screw compressor includes a casing, a screw rotor, an oil sump containing lubricant oil, a lubrication passage and a flow rate controller. The screw rotor is inserted in a cylinder portion of the casing to form a fluid chamber. The screw rotor rotates to suck a fluid into the fluid chamber for compression. The lubrication passage supplies the lubricant oil in the oil sump to the fluid chamber due to a difference in pressure between the oil sump and the fluid chamber. The flow rate controller reduces a flow rate of the lubricant oil supplied to the fluid chamber in accordance with a decrease in operating capacity of the screw compressor.

Abstract: According to at least one aspect of the present disclosure, an apparatus for cooling a coolant for a gas compressor includes a compressor to generate a flow of compressed gas, a dryer in fluid communication with the compressor, and a coolant circuit. The coolant circuit includes a accumulator to accumulate the coolant, a pump in fluid communication with the accumulator and the compressor to circulate the coolant through the coolant circuit, a first intercooler in fluid communication with the accumulator and the pump and structured to transfer heat from the coolant circuit to the compressed gas flow via the dryer, and a valve disposed between the accumulator and the first intercooler and structured to route at least a portion of the coolant through the first intercooler depending on a temperature of the coolant relative to prescribed low and high temperature limits.

Abstract: A cooling system for a rotating machine, such as a centrifugal compressor. Specifically, the cooling system may be configured to cool radial and axial magnetic bearings in the rotating machine and the bearing control system that controls said bearings. The cooling system includes canned magnetic radial bearings on each end of the rotor and a canned bearing control system. The canned bearings and canned bearing control system may be filled with a dielectric cooling fluid and in fluid communication with each other via sealed conduits. Accordingly, the radial magnetic bearings and the bearing control system may be entirely immersed in the dielectric cooling fluid to regulate heat generation. An axial magnetic bearing may also be canned and fluidly coupled to the cooling system to immerse the axial magnetic bearing in the dielectric cooling fluid.

Abstract: Embodiments of the present invention provides an oil balancing apparatus, applied to at least three compressors connected in parallel. The oil balancing apparatus includes a first oil balancing pipe and a second oil balancing pipe. The first oil balancing pipe connects oil sumps of all the compressors, and the second oil balancing pipe only connects oil sumps of oil-rich compressors but not an oil sump of an oil-starved compressor.

Abstract: A compensated barrier and lubrication fluids pressure regulation system for a subsea motor and pump module is disclosed. The system comprises a hydraulic fluid supply, a barrier fluid circuit, and a lubrication fluid circuit. Hydraulic fluid in the barrier fluid circuit is pre-tensioned towards a motor by a first separating pressure compensator which is responsive to the pressure in the lubrication fluid circuit and which applies the sum of the pressure in the lubrication fluid circuit and an inherent pre-tensioning pressure to the barrier fluid circuit. Hydraulic fluid in the lubrication fluid circuit is pre-tensioned towards a pump by a second separating pressure compensator which is responsive to a pumped medium pressure at a suction side or at a discharge side of the pump and which applies the sum of the pumped medium pressure and an inherent pre-tensioning pressure to the lubrication fluid circuit.

Abstract: A system includes a compressor having a shell housing a compression mechanism driven by an electric motor in an on state and not driven by the electric motor in an off state. The system also includes a variable frequency drive that drives the electric motor in the on state by varying a frequency of a voltage delivered to the electric motor and that supplies electric current to a stator of the electric motor in the off state to heat the compressor.

Abstract: A compression device includes a controller to control an operating speed of a compressor based on a detected level of oil in an oil storage area. During a speed-change operation, the controller controls acceleration of the compressor to maintain the oil level within a predetermined range when the oil level is detected to be outside the predetermined range.

Abstract: In order to improve a reciprocating piston compressor for a refrigerant circuit, comprising a crankcase, in which a collecting chamber for lubricant is arranged, a cylinder housing, in which at least one reciprocating piston is movable in an oscillating manner, a valve plate which closes the cylinder housing and in which at least one inlet valve and one outlet valve are arranged, and a cylinder head, in which a suction gas duct which runs to the inlet valve and a compressed gas duct which leads away from the outlet valve are provided, in such a manner that excessive accumulations of lubricant can be avoided, it is suggested that a lubricant suction conduit be provided which has an inlet opening associated with the collecting chamber and an outlet opening associated with the suction gas duct and that the outlet opening be located in an area of the suction gas duct, in which a static pressure, which is lower than a static pressure in the collecting chamber for lubricant, prevails at least temporarily.

Abstract: A refrigerant compressor includes a sealed case 9, a compression mechanism 2 and a motor part 16 contained in the sealed case, and an oil reservoir 53 formed in a lower portion of the sealed case. The refrigerant compressor further includes an oil supply pipe 62 which links the oil reservoir and a suction side of the compression mechanism by passage and introduces oil in the oil reservoir to the suction side, an oil supply amount adjusting means 61 which is provided on the oil supply pipe and adjusts an amount of oil supply supplied to the suction side, a rotational speed detecting means which detects a rotational speed of the motor part, and an oil supply amount controlling unit 80 which controls the oil supply amount adjusting means according to a rotational speed detected by the rotational speed detecting means.

Abstract: In an electric machine, there may be lubrication and cooling needs, such as lubricating bearings and cooling coils of the electric machine. When lubricant is used for both, it is desirable to prioritize the lubrication to the bearings. By providing check valves between a pressurized oil manifold and the cooling coils, lubricant is diverted to the coils only when pressure in the system is sufficient to satisfy both lubrication and cooling. In some embodiments, an oil gallery is provided on an outside surface of a back iron of the stator of the electric machine and orifices are provided in the back iron so that oil drips onto the coils of the electric motor. In some embodiments, the current commanded to the electric motor is based on whether or not lubricant (or other coolant) is being provided to the coils.

Abstract: A coolant pump includes a drive wheel, a driven wheel, and a coupling-control pump. The driven wheel is connected to a coolant impeller and coupled by a variable degree to the drive wheel, the degree of coupling responsive to an amount of fluid confined between the drive wheel and the driven wheel. The coupling-control pump is configured to change the amount of fluid confined between the drive wheel and the driven wheel based on a variable control signal.

Abstract: Improvements in compressor manufacture are achieved by utilizing polymeric components which retain at least 90% of their dimensions after being exposed to a mixture of refrigerants and/or lubricants for 30 days at 60° C. Polymeric materials include (i) polyetherimides, (ii) polyphenylene sulfides, (iii) polyketones, (iv) polysulfones, (v) liquid crystal polymers, and (vi) combinations thereof. Metal coatings on the polymers are the preferred embodiments for housings.

Abstract: In an oil-cooled air compressor for controlling a temperature of a lubricant by changing a flow rate of a cooling medium supplied to a heat exchanger for the lubricant, for obtaining an energy saving effect by variable control of the flow rate of the cooling medium and preventing securely a condensed water from occurring in a compressor unit even when an exhaust duct is arranged inappropriately, a lubricant flow rate adjustor is arranged to measure a temperature of the lubricant and decreasing a flow rate of the lubricant supplied to the heat exchanger so that the lubricant temperature becomes T1 to satisfy T0>T1?TD when T0 is a control temperature of the lubricant and TD is a condensed water occurrence critical temperature at which a condensed water occurs in the compressor.

Abstract: In a water injection air compressor including a compressor main body for compressing air, a water-feed line for feeding water to an actuation chamber in the compressor main body, an air release valve for releasing the compressed air from the compressor main body, and a control panel for executing an on-load operation mode in which water is fed into the actuation chamber and an air release valve is closed and a no-load operation mode in which the water is fed into the actuation chamber and the air release valve is opened, wherein the control panel further executes a dry operation mode in which the water is prevented from being fed into the actuation chamber and with the air release valve is opened.

Abstract: Disclosed is a water-injection type scroll air compressor whose pre-stopping operation time for drying can be reduced while enhancing compressor efficiency. The compressor body 1 includes a water supply line 24 for supplying water to a water feeder 23 connected to an air suction line 2. The water supply line 24 is provided with a control valve 27 that can control a flow rate of the water. A controller 28 conducts driving control of the control valve 27 in a 5×10?5 to 40×10?5 range of an injected-water volume ratio (more specifically, a volume ratio between an intake air flow rate and injected-water flow rate in the water feeder 23 of the suction line 2) and at the same time, in an injected-water volume ratio range of the compressor characterized so that an increase rate of overall adiabatic efficiency of the compressor per 1×10?5 increase rate of the injected-water volume ratio stays less than 2% of an original or initial value.

Abstract: A compressor includes a housing, compression unit, discharge chamber, outlet, and oil separation structure. The oil separation structure, which is arranged between the discharge chamber and the outlet, includes an oil reservoir, oil separation compartment, intake passage, exhaust passage, and supply passage. The oil separation compartment is located upward from the oil reservoir. The intake passage, which extends upward from the oil separation compartment, draws refrigerant gas into the oil separation compartment from the discharge chamber to separate lubrication oil from the refrigerant gas. The exhaust passage extends upward from the oil separation compartment and discharges the refrigerant gas in the oil separation compartment out of the housing through the outlet. The supply passage extends upward from the oil separation compartment and has a larger cross-sectional area than the intake passage. The supply passage supplies the oil reservoir with lubrication oil from the oil separation compartment.

Abstract: A cryopump system includes a cryopump configured to perform a preparatory operation including a cooldown from a room temperature to a cryogenic temperature and to perform a vacuum pumping operation at the cryogenic temperature, a compressor unit of a working gas for the cryopump, a gas line connecting the cryopump and the compressor unit, a gas volume adjuster configured to increase a quantity of the working gas in the gas line during the vacuum pumping operation in comparison with that during the preparatory operation, and a control device configured to control the compressor unit so as to provide a pressure control for the gas line.

Abstract: A method for operating a compressor device and associated compressor device including a compressor chamber and a cooling chamber adjoining the compressor chamber is provided. The pressure of a cooling medium in the cooling chamber is held above the pressure of a compressor medium in the compressor chamber during operation of the compressor device.