摘要:
A swash plate type compressor has a housing assembly (1,3,5), a drive shaft (7), a swash plate (29), a piston (21), a motion converter (35), a bleed passage (39), and an oil separator (43). The housing assembly includes a cylinder bore (1A), a suction chamber (11), a discharge chamber (13), and a crank chamber (15). The drive shaft is rotatably supported by the housing assembly, and extends through the crank chamber. The bleed passage communicates between the crank chamber and the suction chamber. The oil separator is disposed in the housing assembly. The oil separator separates no or less amount of lubricating oil from the refrigerant gas in the increased rotational speed of the drive shaft than that in the decreased rotational speed of the drive shaft. The refrigerant gas passed through the oil separator is introduced into the suction chamber, and the separated lubricating oil is returned to the crank chamber.
摘要:
An introduction passage (31) of rotary valve (35, 36) has outlets (312, 313) for feeding out refrigerant in a suction pressure zone (142) toward each of compression chambers (271, 281). A switch portion in a shutoff state shuts off a portion (142) of the suction pressure zone within a compressor (10) from the outlets (312, 313) of the introduction passage (31). The switch portion includes a valve body (42), a working pressure chamber (412), and a working pressure applying portion (48, 67-68). The working pressure chamber (412) introduces a working pressure that is applied to the valve body (42) so as to arrange the valve body (42) at a communication position. The pressure in the suction pressure zone (142) acts against the pressure in the working pressure chamber (412) through the valve body (42).
摘要:
A roots pump (10) has a housing (11), a plurality of rotary shafts (22,25), a rotor (28-37), a confluent passage (49,51,52,53) and a closed space (P1,P2). The housing (11) forms therein a pump chamber (17,18,19,20,21). The rotary shafts (22,25) are supported on the housing in parallel relation to each other. The rotor (28-37) is mounted on each of the rotary shafts (22,25), and the rotors (28-37) on any adjacent rotary shafts (22,25) are in engagement with each other. A set of the engaged rotors (28-37) is accommodated in the pump chamber (17,18,19,20,21). The confluent passage (49,51,52,53) is formed along one crossing line of paired imaginary swept peripheral surfaces (59,60) in one-to-one correspondence with the paired and engaged rotors (28-37). The closed space (P1,P2) is formed in one-to-one correspondence with each of the paired rotors (28-37) between the paired rotors (28-37) and paired peripheral wall surfaces (59,60) which form the pump chamber (17,18,19,20,21). The closed space (P1,P2) initially joins the confluent passage (49,51,52,53) from a terminal end thereof with rotation of the paired rotors (28-37).
摘要:
A viscous fluid type heat generator including a housing assembly in which a heat generating chamber (8) confining therein a heat generative viscous fluid to which a shearing action is applied by a rotor element (15) rotated by a drive shaft (14), and having inner wall surfaces (2A,3A) confronting outer surfaces (15A,15B) of the rotor element (15), the inner wall surfaces (2A,3A) of the heat generating chamber and the outer faces (15A,15B) of the rotor elements (15) defining a small space in which the heat generative viscous fluid is held, and having fluid movement regulator formed by an elongate recess or ridge (16,17), formed therein to increase or suppress heat generation of the viscous fluid during the rotation of the rotor element in response to a change in an environmental condition in which the heat generator is used, and a change in an operation condition of the viscous fluid heat generator.
摘要:
A vacuum pump has a main pump, a booster pump and a coupling member. The main pump has a first housing and a first pump mechanism accommodated in the first housing. The booster pump has a second housing and a second pump mechanism accommodated in the second housing. The booster pump and the main pump are coupled in series such that gas is sent from the booster pump to the main pump. The coupling member couples the first housing and the second housing to each other. The coupling member is directly coupled to a portion of the first housing that surrounds a last stage of the first pump mechanism such that transmission of heat to the portion is permitted.
摘要:
A vacuum pump having a rotary shaft that is rotated by a drive source has a main pump and a sub pump. The main pump includes a pump chamber and a gas transferring body that is located in the pump chamber. The main pump is driven by the drive source through the rotary shaft for transferring gas to an exhaust space. The sub pump is connected to the exhaust space for partially exhausting the gas from the exhaust space. The sub pump is driven by the same drive source. The displacement volume of the sub pump is smaller than that of the main pump.
摘要:
A vacuum pump draws gas by operating a gas conveying body (23-32) in a pump chamber (39-43) through rotation of a rotary shaft (19, 20). The vacuum pump has an oil housing member (14, 33), a stopper (67, 68, 72) and a circumferential wall surface (702, 712). The oil housing member (14, 33) defines an oil zone (331) adjacent to the pump chamber (39-43). The stopper (67, 68, 72) has a circumferential surface (671, 681, 721). The stopper (67, 68, 72) is located on the rotary shaft (19, 20) to rotate integrally with the rotary shaft (19, 20) and prevents oil from entering the pump chamber (39-43). The center of curvature of the circumferential wall surface (702, 712) coincides with that of the rotary shaft (19, 20). The circumferential wall surface (702, 712) surrounds at least a part of the circumferential surface (671, 681, 721) of the stopper (67, 68, 72) that is above the rotary shaft (19, 20). The circumferential wall surface (702, 712) is inclined such that the distance between the circumferential wall surface (702, 712) and the axis of the rotary shaft (19, 20) decreases toward the oil zone (331).
摘要:
In a compressor of the present invention, an intermediate pressure port 37 through which a first discharge chamber 25 and a motor chamber 29 communicate with each other is formed in a front housing 11. A refrigerant having an intermediate pressure is discharged to the first discharge chamber 25. Consequently, it is possible to guide the refrigerant having the intermediate pressure in the first discharge chamber 25 to the motor chamber 29, and cool an electric motor 5, which generates heat during actuation, with the refrigerant having the intermediate pressure. In the compressor, a first impeller 7 and a second impeller 9 are disposed such that large diameter portions of the first impeller 7 and the second impeller 9 face each other. The second impeller 9 is smaller in diameter than the first impeller 7. Therefore, in the compressor, a first thrust force generated on the first impeller 7 side and a second thrust force generated on the second impeller 9 side act to offset each other. A resultant force of the first and second thrust forces decreases.
摘要:
A turbo type compressor 100 of the present invention comprises a housing 1, a rotating shaft 3, and first and second impellers 7 and 9. The rotating shaft 3 is supported by the housing 1 to be rotatable around a rotational axis O. A cylinder portion 3c is provided on the rear end side of the rotating shaft 3. The rotating shaft 3 is supported by a first radial foil bearing 57 provided on the radially outer circumference of the cylinder portion 3c and a second radial foil bearing 59 provided on the radially inner circumference of the cylinder portion 3c.
摘要:
A compressor includes a housing, a compression mechanism formed in the housing and operable to compress refrigerant, an input shaft extending into the housing from outside and rotatably supported on an axis of the input shaft, an output shaft extending in the housing and rotatably supported on the axis for driving the compression mechanism, a transmission provided in the housing between the input shaft and the output shaft for transmitting torque from the input shaft to the output shaft and also changing the rotating speed of the input shaft into two different speeds of the output shaft for driving the compression mechanism by increasing or remaining the rotating speed of the input shaft and a control device. The transmission includes a plurality of planetary rollers, a carrier rotatably supporting the respective planetary rollers and being integrally rotatable with the input shaft, a sun roller engaged with the respective planetary rollers and integrally rotatable with the output shaft and a ring roller engaged with the respective planetary rollers. The ring roller can be fixed to the housing or rotatable relative to the housing. The control device provided between the carrier and the ring roller for controlling the operation of the transmission includes a one-way clutch provided between the ring roller and the carrier and allowing the ring roller to rotate only one direction relative to the carrier and a clutch provided between the housing and the ring roller, the clutch fixing the ring roller to the housing or allowing the ring roller to rotate relative to the housing. The ring roller includes a first ring engaged with the respective planetary rollers and a second ring supporting the one-way clutch. The ring roller can be movable relative to the housing in the direction parallel to the axis. The first ring and the second ring are connected so that the first ring can be displaced in a radial direction, integrally rotatable with the second ring and movable with the second ring in the direction parallel to the axis.