Abstract: A water-lubrication type screw fluid machine has a first non-contact seal, a second non-contact seal and a lip seal disposed between a rotor chamber and a bearing for a rotor shaft. The bearing is located on the high pressure side and in this order from the rotor chamber side. the bearing includes a low pressure communicating channel for allowing an outflow space formed on the rotor chamber side with respect to the first non-contact seal to communicate with a low pressure channel for the target gas communicating with a low pressure space inside the rotor chamber or the rotor chamber, a pressurized communicating channel for introducing high-pressure target gas into a pressurized space formed between the first and second non-contact seals, and an open communicating channel through which an open space formed between the second non-contact seal and the lip seal opens to the outside of the casing.

Abstract: An oscillating variable displacement ring pump provides both positive and variable displacement. A housing circumscribes a pump chamber. The pump chamber encases an oscillating ring driven by a crank assembly. The ring encircles an end of the crank assembly. The crank assembly includes an annular spacer that rolls inside the ring. When the pump chamber is sealed, rotation of the crank assembly causes ring oscillation in the chamber. Ring oscillation creates vacuum pressure, which draws substances into pump chamber via an inlet port while pumping out substances of the pump chamber via an outlet port. A valve within the pump chamber contacts the ring and follows ring oscillation to help separate incoming substances from outgoing substances. The pump can include an adjustable internal by-pass means to control the volume and pressure of substances delivered by the pump.

Abstract: A rotary compressor is provided, in which an inner diameter of a connection hole connected to a vane chamber and an outer diameter of a connection tube inserted into the connection hole are designated so that the connection tube can closely be adhered to the connection hole, thereby preventing a refrigerant from being leaked out between the connection hole and the connection tube so as to allow a fast and accurate mode switching of the vane, resulting in improvement of the performance of the compressor and prevention of noise caused by vibration of the vane.

Abstract: In a screw compression apparatus in which shaft sealing members (13, 14) isolate a bearing space (7, 8) from a rotor chamber (5) and a lubricating fluid separating collector (3) separates the rotor lubricating fluid from the target gas discharged by the screw compressor (2), rotor lubricating fluid separated by the lubricating fluid separating collector (3) is introduced into the rotor chamber (5) via a rotor lubricating flow channel (25), and a bearing lubricating system (17) supplies a bearing lubricating fluid to the bearing space (7, 8). The bearing lubricating fluid flowing out from the bearing space (7, 8) is cooled and returned to the bearing space (7,8). A part of the target gas may be supplied to the shaft sealing members (13, 14) at a location between carbon rings of the shaft sealing members.

Abstract: There is disclosed a scroll compressor which can lower the noise level of a harsh frequency without taking a lot of troubles. In a sealed container, a scroll compression element and an electromotive element are provided. The scroll compression element is constituted of a fixed scroll including a vertically provided spiral lap, and a swingable scroll including a vertically provided spiral lap and swiveled by a rotary shaft of the electromotive element with respect to the fixed scroll. A refrigerant compressed by gradually reducing, from the outside to the inside, a plurality of compression spaces formed by engaging both the laps with each other is discharged to a discharge pressure space in the sealed container.

Abstract: A bi-rotational hydraulic motor having a selectively pluggable case drain with check valves incorporated into the thrust plate allowing excess lubrication fluid to pass from the bearings into the outlet port of the motor.

Abstract: The compressor includes a sealed housing defining a suction volume and a compression volume respectively provided on either side of a body contained in the housing, an oil injection circuit supplied with oil from an oil contained in a casing and adapted for injecting oil into the compression volume, the oil injection circuit comprising an electrovalve including a body attached to the wall of the sealed housing and a core movable under the action of a magnetic fluid between a closing position for injecting oil into the compression volume and an opening position preventing or limiting the injection of oil into the compression volume. The compressor includes a control system for moving the core of the electrovalve between the opening and closing positions based on the compressor speed and/or on the cooling gas discharge temperature.

Abstract: A self-sealing mechanism for a scroll compressor is disposed inside a frame of the scroll compressor at a position between a back-pressure chamber and a fixed scroll, including an accommodating space; a groove communicating the space with the chamber; a one-way valve disposed at one end of the space adjacent to the groove to maintain communication between the space and the groove in a normally closed state; and a suction port penetrating from the space to an entrance of the fixed scroll. When the pressure of the chamber is increased in an instant, the valve is opened in real time for allowing the lubricating oil inside the chamber to flow into the space, thereby regulating the pressure of the chamber. Moreover, the lubricating oil in the space can be sucked under the suction force from the fixed scroll and fill in positions between the fixed scroll and an orbiting scroll.

Abstract: A vane air motor configured to prevent uneven wear of vanes is provided. The vane air motor has a cylindrical member having a rotor chamber (19) defined by a circular cylindrical inner peripheral surface (11), and a vaned rotor. A plurality of air discharge openings (50) are provided over a predetermined length range in the axial direction of the rotor chamber. Each pair of axially adjacent air discharge openings are spaced from each other and overlap each other as seen in the circumferential direction of the rotor chamber.

Abstract: To a hermetic compressor and a refrigeration cycle device having the same, an oil separator for separating oil from a refrigerant discharged from a compression unit is added. Separated oil is recollected into an oil pump driven by a driving motor. Because refrigerant separated from the oil is prevented from being re-introduced into the compressor, a cooling capability of the refrigeration cycle device may be enhanced. Because the oil pump is driven by the driving force of the driving motor, the compressor may have a simplified configuration, and the fabrication costs may be reduced. The oil used for a crankshaft lubrication process is returned to the oil pump by forming an oil pocket between bearing surfaces of a crankshaft and the oil pump, oil may be prevented from back-flowing to the oil separator from the crankshaft. This may allow oil to be smoothly recollected into the oil pump.

Abstract: A scroll compressor is provided and may include an orbiting scroll member having an orbiting end plate and an orbiting spiral wrap extending from the orbiting end plate. The scroll compressor may also include a non-orbiting scroll member having a non-orbiting end plate and a non-orbiting spiral wrap extending from the non-orbiting end plate and intermeshed with the orbiting spiral wrap. The scroll compressor may further include a drive member for causing the orbiting scroll member to orbit relative to the non-orbiting scroll member and a discharge slot formed by one of the orbiting scroll member and the non-orbiting scroll member. A discharge valve may be rotatable with the drive member and may operate between a closed state preventing fluid communication between the pockets and the discharge slot and an open state permitting fluid communication between the pockets and the discharge slot.

Abstract: An oil supply groove in communication with a pump room is formed above a bearing of a housing, and an open air groove in communication with atmospheric air is formed at a position rotated around the bearing by 90° from the oil supply groove. In a shank of a rotor, a branch passage branching from an oil passage formed in its axial direction to the diametrical direction of the shank and an open air passage formed in the direction perpendicular to the branch passage are formed. The branch passage and the oil supply groove communicate with each other while the open air passage and the open air groove are arranged to also communicate with each other.

Abstract: A rotary spring-return actuator operator is provided with a multi-slot shaft and a clock type spring retained by a retaining band which encircles the spring in such a manner as to insure that the potential energy within the spring is safely contained during all operations requiring disassembly of the actuator assembly, and wherein the retaining band facilitates the in-field reversal of the spring direction or the adjustment of the spring preload by securing the spring to one or more of the slots on the multi-slot shaft.

Abstract: A variable capacity vane pump (100) has a pump housing (10) having a high-load bearing part (10a) on which a higher load is exerted than another part when the pump vane pump (100) operates. A control valve (21) for varying a capacity of the vane pump (100) is provided in a valve housing (28) which is formed integrally in the pump housing (10). By arranging the valve housing (28) on the same side of the pump housing (10) as the high-load bearing part (10a) with respect to the rotation axis of the vane pump (100), the high-load bearing part (10a) can be reinforced without increasing the size of the vane pump (100).

Abstract: A valve for selectively allowing the return of oil from a discharge plenum to a suction plenum includes a passage which is selectively opened or blocked by a valve spool. The valve spool sees a pressure from a discharge pressure location upstream of a discharge check valve on one face, and a discharge pressure from a discharge plenum on an opposed face. While the compressor is running, the two pressures should be relatively equal. The face which sees the pressure from the chamber upstream of the check valve is larger than the face which sees the pressure from the discharge plenum. Thus, when the compressor is running, the valve spool is biased to a first position at which it allows oil return from the discharge plenum to the suction plenum. However, upon shutdown of the compressor, the pressure in the chamber upstream of the discharge valve drops. The valve spool will be driven to a second position at which it blocks communication for oil return.

Abstract: A rotary compressor includes a compressor casing which includes a compression unit for sucking refrigerant gas from a low pressure side of a refrigerating cycle and ejecting the gas to a high pressure side of the refrigerating cycle, and a motor for driving the compression unit through a rotating shaft. The compressor has a gas hole formed on a rotor of the motor for causing a refrigerant gas below the motor to pass upward, and an oil separation plate having a central cylindrical portion, a curved portion continuous to the central cylindrical portion and curved in a radial direction, and an outer peripheral disk portion continuous to the curved portion and is fixed on the rotor by a rivet so that a lower end portion of the central cylindrical portion comes into close contact with the upper end of the rotor or an upper end plate of the rotor.

Abstract: The fluid system is intended for an oscillating-piston engine (100) which has at least two double-armed oscillating pistons (4) arranged in a spherical housing (19) and revolving together about an axis (23) of revolution arranged in the housing center, wherein the oscillating pistons, when revolving, mutually perform reciprocating oscillating movements about an oscillation axis (24) perpendicular to the axis (23) of revolution, and guide members (5) attached to at least two pistons (4) engage in at least one guide groove (17) formed in the housing (19) and serving to control the oscillating movements. The fluid system (70) comprises at least one central feed opening (1), lying in the vicinity of an end of the axis (23) of revolution, for a fluid, continuous cavities and/or bores (10) in the pistons (4) for the fluid, and a fluid discharge on the outer side (3) of the respective piston.

Abstract: An oil-cooled type screw compressor includes shafts mounted on rotors in a casing and extended to two sides of the rotors. Thrust plates rotate with the shafts. The thrust plates are sealed while spacing them from the rotors and define first and second spaces. Thrust bearings are arranged in the first and second spaces. An oil feed passage communicates with the one of the first and second spaces that is located on the side to apply a force against the thrust force to the thrust plates when boosted. An oil discharge passage communicates with the one of the first and second spaces that is located on the side to apply a force against the anti-thrust force to the thrust plates when boosted, to establish the communication between the space inside and an oil discharge target. An oil distribution passage distributes oil between the first space and the second space.

Abstract: An integrally formed vane (301) is disposed slidably in a vane groove (205a) of a first cylinder (205) and a vane groove (206a) of a second cylinder (206). A cut-out (301a) with a width substantially equal to the thickness of an intermediate plate (304) is provided in the vane (301), which is divided by this cut-out (301a) into a first vane portion (301b) whose leading end makes contact with a first piston (209) at its leading end and a second vane portion (301c) whose leading end makes contact with a second piston (210). This configuration allows the first vane portion (301b) to be pushed toward the first piston (209) side by the pressure difference acting on the second vane portion (301c) and makes it possible to keep a contact state between the first vane portion (301b) and the first piston (209), even when no pushing force toward the first piston (209) side that results from the pressure difference acts on the first vane portion (301b).

Abstract: A variable capacity rotary compressor includes a rolling piston eccentrically rotated in the compression space of the cylinder assembly, and a vane coming in contact with the rolling piston. A vane restricting device restricts the vane by applying a pressure onto a side face of the vane, where a sectional area A of a passage through which the restriction pressure is applied to the side face of the vane is formed so as not to be larger than a vane area B of the vane to which the restriction pressure is applied through a passage. The passage includes a first passage for connecting an inner space of the casing to a vane slot which is provided in the cylinder assembly and has the vane slidably inserted therein, and a second passage for connecting the vane slot to an inlet which is connected to the suction chamber of the cylinder assembly.

Abstract: There is disclosed a scroll compressor capable of improving the oil separating device of a refrigerant gas discharged from a scroll compression element to effectively suppress the amount of oil to be discharged through a discharge tube. The scroll compressor has, in a sealed container, a scroll compression element, a motor element which drives the scroll compression element, and a support frame having a bearing portion which keeps a shaft of the motor element, and provided with a communication path. The scroll compressor further includes a shield plate which extends from the support frame to the motor element side to surround the periphery of the bearing portion, and a guide member provided at an outlet of the communication path to guide the discharged gas in the direction of the shield plate.

Abstract: A multi-stage rotary compressor comprises: a casing having a sealed space therein; a driving unit installed in the casing, for generating a driving force; a first compression unit and a second compression unit for receiving the driving force from the driving unit and compressing a refrigerant; and a connection unit for connecting the first and second compression units and guiding the refrigerant discharged from the second compression unit to be sucked directly in the first compression unit and then re-compressed, by which it is possible to vary capacity, even using every plurality of compression units, and to obtain power saving effect suitable for a saving mode.

Abstract: A compressor may include a shell assembly, a first scroll member, and a second scroll member. The first scroll member may be located within the shell assembly and may include a first end plate and a first spiral wrap extending from a first side of the first end plate. The first end plate may define an oil groove extending into the first side. The second scroll member may be located within the shell assembly and supported for orbital movement relative to the first scroll member. The second scroll member may include a second end plate and a second spiral wrap extending from the second end plate and meshingly engaged with the first spiral wrap to form compression pockets.

Abstract: In an oil-cooled screw compressor comprising, a compressor body including a pair of a male rotor and a female rotor, a motor including a stator and a motor rotor connected to one of the male and female rotors, and an oil separator container for gathering the oil from a mixture of the gaseous manner and oil to restrain the oil from proceeding with the compressed gaseous matter after the mixture of the gaseous manner and oil is discharged from the pair of male and female rotors, a rotational axis of the motor rotor and the rotational axis of the one of the male and female rotors are coaxial with respect to each other.

Abstract: A motor, comprising: an internal motor chamber, and a rotor rotatable therein. The rotor is drivable by having a pressure medium applied to it and a braking element for braking the rotor. The braking element is axially arranged directly adjacent to the rotor, wherein the braking element and the rotor are axially moveable with respect to each other and form a spring-loaded friction pair, at least between a front end face of the rotor and the braking element.

Abstract: In a motor-driven scroll type compressor, a rotary shaft includes a first opening at a position adjacent to a front end of the rotary shaft and facing an inner surface of a bearing for rotatably supporting the front end of the rotary shaft, a second opening at a position adjacent to a rear end of the rotary shaft and communicating with a back pressure chamber provided in front of a movable scroll member in a housing of the compressor, a communication passage interconnecting the first opening and the second opening, and a throttle formed by a clearance between the first opening and the inner surface of the bearing.

Abstract: A compressor includes a compression mechanism for suctioning gas through a suction path to compress the gas and discharging the compressed gas and a check valve for preventing backward-flow of the gas in the suction path. The check valve includes an accommodation hole (its one end is opened toward the suction path and its another end is functioned as a reservoir), a valving element accommodated within the accommodation hole movably, a valve seat provided at the opened end of the accommodation hole for closing the suction path while the valving element is pressed thereonto and an urging component for urging the valving element toward the valve seat. A release groove is grooved on an inner surface of the accommodation hole. The reservoir is communicated with the suction path through the release groove. The compressor can reduce machining cost, component count and weight in respect to the check valve.

Abstract: A compressor incorporated with an oil separator having a separation chamber and communication holes. The separation chamber is placed adjacent to a discharge chamber, has a space formed in the entire inside of the separation chamber, separates oil-containing gas, which is introduced into the separation chamber, into gas and oil by centrifugal separation, allows the separated oil to drop downward, and upwardly extracts the separated gas. The communication holes interconnect the discharge chamber and the separation chamber and introduce the oil-containing gas, coming from the discharge chamber, into the separation chamber. The communication holes are arranged in the separation chamber, in a direction extending from a gas release side to an oil drop side. The structure of an oil separation section is simplified to improve productivity and reduce cost, and a high degree of design freedom of the position of a discharge port is obtained.

Abstract: A fluid machinery includes a rotary mechanism, an annular back pressure chamber and an oil passage. The rotary mechanism includes first and second cooperating members, each including an engaging member extending from an end plate, with the cooperating members being arranged to oscillate relative to each in order to change volumes of operation chambers formed between the cooperating members. The annular back pressure chamber is formed on the back surface side of the end plate of the first cooperating member, and communicates with an intermediate operation chamber of the operation chambers to thrust the first cooperating member against the second cooperating member. The intermediate operation chamber is in an intermediate pressure state. The oil passage is arranged to communicate an oil into the back pressure chamber to fill the back pressure chamber with the oil. The rotary mechanism can include a piston and cylinder, or can include a fixed and orbiting scroll.

Abstract: A suction screen member is provided that bridges the inlet port and entrance port between a compressor housing and a suction duct in a scroll compressor. The suction screen member also serves to screen fluid entering the scroll compressor to prevent particulates from entering the scroll compressor. The suction screen member may be formed from only two components, including a sheet metal body that has a folded over section to provide a mounting segment that mounts into the inlet fitting for the outer housing and a tubular extension. Crimping of the folded over segment can secure the screen thereto. Other embodiments may have employ welding for screen attachment.

Abstract: A scroll type compressor has a fixed scroll member, a movable scroll member, an oil reservoir, a back-pressure chamber, an oil extraction passage, a flow passage, and a partition wall. The back-pressure chamber disposed behind the movable scroll member is in communication with a discharge chamber. The oil extraction passage having a regulating valve or a throttle connects the back-pressure chamber to the oil reservoir. The oil return passage and the flow passage connect the oil reservoir to a suction chamber, respectively. The flow passage introduces excess lubricating oil into the suction chamber when the level of lubricating oil in the oil reservoir becomes higher than a predetermined level. The partition wall disposed between the openings of the oil extraction passage for restricting lubricating oil from the oil extraction passage other than the excess lubricating oil collected in the oil reservoir from flowing to the flow passage.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flowpath. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flowpath. A check valve (70; 170; 270) has a valve element (72; 172; 272) mounted for movement between a first condition permitting downstream flow along the flowpath and a second condition blocking a reverse flow. The valve element includes a resonator (112; 174; 274).

Abstract: A method of assembling a compressor, including assembling, first as a subassembly external of the compressor housing, portions of the motor-compressor unit, including a crankcase, mount brackets, stator, outboard bearing assembly, and drive shaft. Thereafter, the motor-compressor unit subassembly is inserted into a first end of the housing, and the housing is shrink-fit around the subassembly. The mount brackets may then be welded to the interior surface of the housing. Once the mount brackets are welded to the housing, the remainder of the components of the motor-compressor unit, including the orbiting scroll member, the Oldham coupling, and the fixed scroll member, are then assembled to the motor-compressor unit subassembly and the housing through a second end of the housing opposite the first end, followed by welding the top and bottom caps to the housing.

Abstract: A scroll compressor and assembly includes a suction duct to direct refrigerant from the housing inlet to a location upstream of a motor. Additionally, the suction duct includes drain ports that act to drain oil received in the suction duct into the oil sump. This can be used for filling and charging the oil sump with oil initially by using the common refrigerant inlet port through the housing and also acts to collect coalesced oil from oil mist generated by operation of the scroll compressor in a refrigeration system and likewise drain the lubricant oil into the lubricant sump.

Abstract: A dual drive compressor is disclosed including a discharge chamber having a wall disposed therein forming a plurality of discharge zones within the discharge chamber to attenuate pulsations caused by a fluid received in the compressor and improve a performance of the compressor.

Abstract: A scroll-type expansion machine includes an expansion mechanism including an orbiting scroll and a first fixed scroll for expanding a refrigerant and recovering a power, a sub-expansion mechanism including an orbiting scroll and a second fixed scroll for compressing the refrigerant by the power recovered by the expansion mechanism, and a seal ring disposed in at least one of an outer circumference portion of the sub-compression mechanism or an outer circumference portion of the expansion mechanism. An oil flow path is opened in an upper space of a hermetic vessel to make the upper space and a lower space at a compressed pressure of the sub-compression mechanism, and the lower space is provided with an oil pipe for communicating with the main compressor.

Abstract: An oil rotary vacuum pump of mechanical type is filled with a requested amount of oil at the end of the manufacturing process, then it is stored and then shipped to the user, letting the user avoid an operation of introducing the proper amount of oil into the pump. The oil leakage is prevented by securing the suction and/or exhaust ports of the pump, which are sealed by means of a removable sealing member, for instance by means of a membrane.

Abstract: The rotary engine includes a circular stator, a circular rotor rotating about the stator; the rotor and the stator being separated by a circular cylinder and at least one element with two flanges. The rotor includes two compression pistons attached to the inner surface of the rotor. These two pistons are located at the two extremities of a first diameter of the rotor and kept substantially in contact with the outer surface of the stator. The stator includes a recess at each extremity of a diameter. Each recess forms a compression chamber with the compression piston positioned at the end of the recess in the direction of rotation of the rotor and one of the flanges of the element with two flanges, referred to as the cylinder head flange. The motive force is applied to the compression piston when the pressure of the gases inside the compression chamber is suddenly increased to a predefined value.

Abstract: In a gas compressor, a cyclone block is configured to include a substantially cylindrical space into which a compressed gas is introduced to separate refrigeration oil from the gas. A pressure bypass is formed in the substantially cylindrical space defined by an outer cylindrical unit and an inner cylindrical unit to communicate with a discharge chamber having lower pressure than that of the substantially cylindrical space. The pressure bypass includes a pressure valve to open and close the pressure bypass in accordance with the internal pressure of the substantially cylindrical space having the pressure bypass. During a high speed operation of a compressor unit, the coolant gas including unseparated refrigeration oil is discharged from the pressure bypass.

Abstract: A rotary pump includes a stator having a chamber delimited by a circumferential wall, a cylindrical rotor tangent to the circumferential wall of the chamber and suitable for being driven in rotation around an axis eccentric with respect to the chamber, and at least a vane diametrically traversing the rotor by delimiting in the rotor two half shells, mutually separated by the walls guiding the vane. The two half shells are hollow, and inside these hollow half shells are housed elastic leaf springs forming one-way valves with respect to four passageways formed in the half shells; the discharge of the air-oil mixture takes place, after a centrifugation and a partial recycling, through passageways, also in the case of a counter rotation of the pump. This configuration allows a bidirectional use of the same rotor.

Abstract: A new type of progressive cavity compressor is intended primarily for 3 to 10 ton vapor-cycle air conditioning systems. Major working section elements include a rotor, a stator, inlet ports, an outlet endplate, and outlet check valves. The helical rotor is driven in an eccentric orbital path inside the helical stator. In the preferred embodiment, the rotor and stator helices have varying (non-uniform) pitch in the working section. Rotor-stator running clearances are tight, to minimize leakage. Two outlet check valves regulate refrigerant discharge flow and pressure. Efficient compression is provided over a wide range of compression ratios, corresponding to a wide range of ambient temperatures in an air conditioning application. The invention can improve the energy efficiency of air conditioning systems, especially at off-design conditions.

Abstract: Compressor has a fixed scroll and a scroll movable in an orbit relative to the fixed scroll. The fixed and movable scrolls are equipped with a spiral wrap that engage each other and delimit variable-volume compression chambers. The spiral wrap of the movable scroll has a stepped portion extending over at least a portion of its length. At least one of the scrolls defines a passage for communication, during orbital movement of the movable scroll, between two compression chambers, with the ends of the passage terminating respectively on either side of the outer and inner walls of the spiral wrap of the scroll with the passage or inside the outer and inner walls of the spiral wrap of the scroll with the passage. The passage has a check valve for allowing fluid to flow only from the outer wall of the spiral wrap of the scroll with the passage to the inner wall.

Abstract: Provided is a scroll compressor having an improved function of oil circulation and back pressure control. The scroll compressor includes: a housing; a drive part for generating a rotational force; a drive shaft driven by the drive part; and a scroll compression part including a stationary scroll fixed regardless of rotation of the drive shaft and having a scroll wrap for compressing sucked fluid and a discharge port for supplying coolant into a discharge chamber, and an orbiting scroll orbited depending on rotation of the drive shaft and having a scroll wrap, characterized in that the coolant compressed by the scroll compression part is conveyed to the discharge chamber, the coolant of the discharge chamber is separated into oil and gas in an oil separator, the gas being discharged through a discharge hole and the oil being supplied into a back pressure chamber through a return path formed in the stationary scroll, and the oil is returned into a suction chamber through a back pressure adjustment valve.

Abstract: A compressor includes an ejector oil pump which sucks the oil from an oil reservoir in the bottom part of a sealed container to an oil passage formed in a rotary shaft, and the ejector oil pump includes an oil suction pipe having one end connected to the oil passage and the other end which opens in the oil reservoir, and an ejector pipe having one end which communicates with the discharge side of a compressor mechanism portion and the other end inserted into the opening of the other end of the oil suction pipe to open. The inner diameter of the other end of the oil suction pipe is larger than the outer diameter of the other end of the ejector pipe, and the other end of the oil suction pipe is provided with first and second dowel portions which position the other end of the ejector pipe.

Abstract: A hermetic compressor and a refrigeration cycle device having the same are provided. An oil separator is installed either outside or inside of a casing to separate oil from a discharged refrigerant and an oil pump driven by a driving force of a motor is used to recollect the oil separated in the oil separator, whereby the separation between oil and refrigerant can effectively be performed and also a fabricating cost can be reduced. Also, an introduction of the separated refrigerant back into the compressor can be prevented so as to improve a cooling capability of the refrigeration cycle device. In addition, the oil pump is driven by the driving force of the motor, resulting in a simple configuration of the compressor and a reduction of a fabricating cost of the compressor.

Abstract: According to an aspect of the present invention, an electric pump includes: a housing; an outer rotor; an inner rotor; a base member facing one side surface of the outer rotor and one side surface of the inner rotor; a side plate member, having a facing surface facing the other side surface of the outer rotor and the other side surface of the inner rotor and a non-facing surface opposed to the facing surface; a shaft; a suction port; a discharge port; a negative pressure applied region; a positive pressure applied region; and a relief valve, discharging the fluid from the positive pressure applied region to a non-facing surface side of the side plate member when a pressure applied at the positive pressure applied region exceeds a predetermined value.

Abstract: A rotary compressor has two compression capacities according to two different rotational directions of the driving shaft. The rotary compressor includes a driving shaft with an eccentric portion. A roller rotates on the shaft along an inner circumference of the cylinder. A vane installed in the cylinder continuously contacts the roller. An upper and a lower bearing are respectively disposed on the top and bottom of the cylinder. A disc shaped valve rotates between two positions and has at least one suction port for selectively supplying refrigerant inside the compression chamber according to the rotational direction of the driving shaft and at least one discharge port communicates with the compression chamber for discharging the compressed refrigerant. The refrigerant is supplied through a communication hole to a port formed on the outer valve.

Abstract: A compressor includes a shell, a compression mechanism supported within a suction pressure region of the shell and including a discharge outlet in communication with the discharge chamber, and a discharge valve assembly. The discharge valve assembly includes a valve member, a valve stop including an opening therethrough, and a communication member defining a fluid passage and extending into the discharge chamber from the valve stop toward the discharge outlet in the discharge chamber to provide fluid communication between the opening in the valve stop and a location downstream of the valve stop.

Abstract: A scroll compressor has a reed valve mounted on a central discharge port. The reed valve has a valve portion at a first end and a pin holding the reed valve onto a non-orbiting scroll member at a second end. The reed valve extends along a plane which is non-perpendicular to a drive axis of a drive shaft such that the second end, which receives the pin, is further removed from the compression chambers than is the first end of the reed valve, which covers the central discharge port.

Abstract: The invention relates to a vacuum pump (1) for vehicle motors, comprising a stator (2), a chamber defined within said stator (2) and at least one vane rotatably mounted inside said chamber so as to generate a depression. The stator (2) comprises inlet openings for air and oil, and a first discharge outlet (30) on which a first one-way valve operates (35). According to the invention, the stator (2) further comprises a second discharge outlet (50) separate from said first discharge outlet (30) and a second one-way valve (55) operating on said second discharge outlet (50). In this manner it is possible to separate the air discharge from the oil discharge, both physically and operationally. The invention further relates to a one-way valve for said vacuum pump. Such valve comprises a blade body (60) having a first blade which defines a first one-way valve (35) and at least one second blade which defines at least one second one-way valve (55).