Abstract: A vacuum pump which can reduce a stress generated in a connected part between a rotating body and a rotating shaft is provided. A rotating body is provided having rotor blades provided on an outer periphery of a rotor-blade forming portion, and fastened to the rotor shaft by a bolt, and rotatable with the rotor shaft. At least either one of a fitting hole portion fitted with the rotating shaft and a through hole portion, through which a bolt penetrates, in the rotating body is a stress-reduction target portion, and a groove portion that reduces stress generated in the stress-reduction target portion during rotation of the rotating body is provided.

Abstract: In a vacuum pump in which the rotor blade in one stage has an outer diameter that is smaller at an outlet port side, or the rotor blade in one stage has an inner diameter that is larger at an outlet port side, at least one of an outer circumference portion or an inner circumference portion of the stator blade that is located immediately above the rotor blade having a smaller outer diameter or immediately above the rotor blade having a larger inner diameter has a tapered surface sloping down to an outlet port side. By providing the tapered surface, entering molecules are reflected at a right angle, sent toward an inner circumference side, and hit by the rotor blade in the upper stage. The molecules are thus sent to a next exhaustion stage.

Abstract: A vacuum pump and a vacuum pump component are provided that achieve the efficient heat dissipation of the rotor without changing the material or structure of stator blades or rotor blades. The vacuum pump includes a casing having a gas inlet port and a gas outlet port and a rotor configured to rotate in the casing. The vacuum pump is configured to exhaust gas from the gas inlet port to the gas outlet port by rotation of the rotor. The rotor substantially has the shape of a cylinder. A purge gas flows between the inner circumference surface of the rotor and the stator column that faces at least a part of the inner circumference surface of the rotor. A projection or a groove that disturbs the flow of the purge gas is provided in the flow passage of the purge gas.

Abstract: An electromagnet unit in which influence of a noise on a displacement sensor is suppressed and which can be installed in a space-saving manner and a vacuum pump including the electromagnet unit are provided. An electromagnet unit includes a radial electromagnet which controls a shaft to a predetermined position, a radial sensor which detects a position of the shaft, and a printed board interposed between the radial electromagnet and the radial sensor and on which a wiring pattern for sensor connecting coils of the corresponding two radial sensors to each other and a wiring pattern connecting coils of the corresponding two radial electromagnets to each other are provided. The wiring pattern for sensor and the wiring pattern for electromagnet are disposed so as not to overlap when seen from the axial direction.

Abstract: Provided are a vacuum pump which can be reduced in size without reducing exhaust performance, and a connection port which is used in the vacuum pump. The connection port which connects the vacuum pump and an auxiliary pump includes an oval first opening connectable to the vacuum pump and a circular second opening connectable to the auxiliary pump, and a diameter dimension of the first opening is set to be smaller than a diameter dimension of the second opening in an axial direction of the vacuum pump.

Abstract: Bobbins of an annular electromagnet each have a bobbin body that has a coil wire wound around an outer periphery thereof and is attached to a respective tooth of an annular stator core by having the corresponding tooth inserted therethrough. A first flange portion in a rectangular hallow shape is provided on an end surface of the bobbin body near the center of the annular stator core and a second flange portion in a rectangular hallow shape is provided on the other end surface of the bobbin body. A coil winding amount increasing means is formed at least on the first flange portion or the second flange portion and increases the amount of winding of the coil wire wound around the bobbin body.

Abstract: A vacuum pump and a sensor target are provided that are inexpensive and widen the linearity range of the sensor sensitivity as compared to a configuration in which a ferromagnetic material is used for the sensor target of a displacement sensor, and also reduce the possibility of touch down even when a disturbance occurs. An axial displacement sensor 109 includes a shaft 109A, which is extended through and fixed to the central section of a holder 5 holding an axial electromagnet 106, and a bobbin 109B, which is coupled to the upper end of the shaft 109A and around which a coil 7 is wound. A shaft end portion 113B, which has the shape of a small-diameter column, projects from the lower end of a rotor shaft 113 and is separated from the coil 7 by a gap 2. An external thread is formed on the outer circumference of the shaft end portion 113B so that a nut 19, which has an internal thread on the inner side, is engaged with the shaft end portion 113B.

Abstract: Bobbins of an annular electromagnet each have a bobbin body that has a coil wire wound around an outer periphery thereof and is attached to a respective tooth of an annular stator core by having the corresponding tooth inserted therethrough. A first flange portion in a rectangular hallow shape is provided on an end surface of the bobbin body near the center of the annular stator core and a second flange portion in a rectangular hallow shape is provided on the other end surface of the bobbin body. A coil winding amount increasing means is formed at least on the first flange portion or the second flange portion and increases the amount of winding of the coil wire wound around the bobbin body.

Abstract: In a vacuum pump, the lower Ra sensor target, the fourth spacer, and the Ra electromagnetic target are configured in this order, from the inlet port side toward the outlet port side, at the lower side of the shaft of the 5-axis control magnetic bearing Likewise, at the lower side of the stator, the lower Ra sensor and the lower Ra electromagnet are configured in this order, from the inlet port toward the outlet port. In other words, the lower Ra sensor is disposed above the lower Ra electromagnet. According to this configuration, the third spacer fixed above the lower Ra sensor target is shortened. As a result, the height of the 5-axis control magnetic bearing and the length of the stator column enclosing electrical components constituting the 5-axis control magnetic bearing is reduced, thereby reducing the overall height of the vacuum pump.

Abstract: An object is to reduce an adhesion amount of a product in a vacuum pump as a whole and effectively prevent occurrence of a trouble in a vacuum pump electric system due to a magnetic flux leak. A vacuum pump includes a rotor enclosed in a pump case, a rotating shaft fixed to the rotor, a supporting means that rotatably supports the rotating shaft, a driving means that rotates the rotating shaft, and thread-groove-exhaust-portion stators that form thread grove exhaust passages between the thread-groove-exhaust-portion stator and an outer circumferential side of or an inner circumferential side of the rotor. A heating portion is provided below the thread-groove-exhaust-portion stators. The heating portion includes a yoke, a coil, and a heating plate. The heating portion heats the yoke and the heating plate with electromagnetic induction heating by feeding an alternating current to the coil.

Abstract: Provided are a stator blade assembly advantageous for improving the evacuation performance by shortening the evacuation time, and an exhaust pump provided with such a stator blade assembly. Inner and outer stator blade bases of a plurality of stator blades are supported by frames. A projecting portion protruding from the frame supporting the inner stator blade base, or from the frame supporting the outer stator blade base, or from both of the frames is provided in a gap in the vicinity of the inner or outer stator blade base between one of the supported stator blades and the stator blade transversely adjacent thereto.

Abstract: An object is to reduce an adhesion amount of a product in a vacuum pump as a whole and effectively prevent occurrence of a trouble in a vacuum pump electric system due to a magnetic flux leak. A vacuum pump includes a rotor enclosed in a pump case, a rotating shaft fixed to the rotor, a supporting means that rotatably supports the rotating shaft, a driving means that rotates the rotating shaft, and thread-groove-exhaust-portion stators that form thread grove exhaust passages between the thread-groove-exhaust-portion stator and an outer circumferential side of or an inner circumferential side of the rotor. A heating portion is provided below the thread-groove-exhaust-portion stators. The heating portion includes a yoke, a coil, and a heating plate. The heating portion heats the yoke and the heating plate with electromagnetic induction heating by feeding an alternating current to the coil.

Abstract: Provided are a stator blade assembly advantageous for improving the evacuation performance by shortening the evacuation time, and an exhaust pump provided with such a stator blade assembly. Inner and outer stator blade bases of a plurality of stator blades are supported by frames. A projecting portion protruding from the frame supporting the inner stator blade base, or from the frame supporting the outer stator blade base, or from both of the frames is provided in a gap in the vicinity of the inner or outer stator blade base between one of the supported stator blades and the stator blade transversely adjacent thereto.

Abstract: The distance h between a base end face 12ta (12tb) of a stator-blade-wheel outer ring part 12a and the corresponding rotor-blade end face 4aa (4ab), is set at a value larger than the maximum deformation of the running rotor blade wheel 4a during the pump operation. The larger distance h keeps perfectly stator-rotor separation, while the outer ring part 12a of a stator blade wheel 12 goes, in assembling, into the rotor area on account of large shift of any half of stator blade wheels owing to the wide cutting width. It makes also easy stator blade wheel assembling of the pump, as it is allowable to arrange half stator blade wheels with some eccentricity.

Abstract: [Problem to be Solved] Stator blade wheels and rotor blade wheels do not interfere with each other using lower-cost but wider cutting-width cutting or grinding for half-cutting-off of the stator blade wheels and not using expensive but narrower cutting-width wire electric discharge machining. [Solution] The distance h between a base end face 12ta (12tb) of a stator-blade-wheel outer ring part 12a and the corresponding rotor-blade end face 4aa (4ab), is set at a value larger than the maximum deformation of the running rotor blade wheel 4a during the pump operation. The larger distance h keeps perfectly stator-rotor separation, while the outer ring part 12a of a stator blade wheel 12 goes, in assembling, into the rotor area on account of large shift of any half of stator blade wheels owing to the wide cutting width. It makes also easy stator blade wheel assembling of the pump, as it is allowable to arrange half stator blade wheels with some eccentricity.

Abstract: A gas compressor includes a housing with suction and discharge ports, and a gas-compressing mechanism housed in the housing to compress a gas sucked through the suction port and discharge the compressed gas via the discharge port. The mechanism includes a cylinder defining a cylinder chamber with a circular or elliptical cross-sectional shape. The cylinder has a suction inlet and a discharge outlet. The suction inlet and the discharge outlet are opened in a peripheral wall of the cylinder chamber. A suction passage is formed along an outer periphery of the cylinder corresponding to a peripheral direction of the cylinder chamber. A discharge passage extends inside a thick portion of the cylinder along a center axis of the cylinder chamber. The suction inlet communicates with the suction port via the suction passage. The discharge outlet communicates with the discharge port via the discharge passage.

Abstract: A gas compressor includes a housing with suction and discharge ports, and a gas-compressing mechanism housed in the housing to compress a gas sucked through the suction port and discharge the compressed gas via the discharge port. The mechanism includes a cylinder defining a cylinder chamber with a circular or elliptical cross-sectional shape. The cylinder has a suction inlet and a discharge outlet. The suction inlet and the discharge outlet are opened in a peripheral wall of the cylinder chamber. A suction passage is formed along an outer periphery of the cylinder corresponding to a peripheral direction of the cylinder chamber. A discharge passage extends inside a thick portion of the cylinder along a center axis of the cylinder chamber. The suction inlet communicates with the suction port via the suction passage. The discharge outlet communicates with the discharge port via the discharge passage.

Abstract: The present invention provides a controlling apparatus and a controlling method for a mode change type refrigerating system allowing the most appropriate temperature control even with respect to various heating loads. When a person sets a target temperature setter and a fan setter in a motor vehicle as desired, a unit to be connected with a mode change condition circuit 101 is determined from among control units and from among calculation units of speed revision. A capacity control instruction value (Duty 1) calculated by controlling a temperature and a capacity control instruction value (Duty 2) calculated by revising a speed are added, then the capacity of a variable capacity type gas compressor is controlled with reference to a capacity control instruction value (Duty 3) as the added signal.

Abstract: The present invention provides a controlling apparatus and a controlling method for a mode change type refrigerating system allowing the most appropriate temperature control even with respect to various heating loads. When a person sets a target temperature setter and a fan setter in a motor vehicle as desired, a unit to be connected with a mode change condition circuit 101 is determined from among control units and from among calculation units of speed revision. A capacity control instruction value (Duty 1) calculated by controlling a temperature and a capacity control instruction value (Duty 2) calculated by revising a speed are added, then the capacity of a variable capacity type gas compressor is controlled with reference to a capacity control instruction value (Duty 3) as the added signal.

Abstract: A magnetic bearing device has a rotational member mounted for undergoing rotation about a rotary axis, a permanent magnet disposed on the rotational member, and a motor for rotating the rotational member. The motor has a core, projecting portions extending from the core, and motor coils each wound around a respective one of the projecting portions. The motor is disposed opposite to and spaced-apart from the permanent magnet for rotating the rotational member and contactlessly controlling an axial position of the rotational member along the rotary axis only by a magnetic forces generated between the permanent magnet, the core and the motor coils. A magnetic radial bearing contactlessly controls a radial position of the rotational member.