Abstract:
A refrigerant compressor having a drive shaft for driving a compressing mechanism and driven by a drive power transmitted from an external drive power source, and a rotation detecting unit for detecting the rotating speed of the compressor by detecting a change in the magnetic flux leaking from the solenoid clutch and circulating through a predetermined magnetic circuit. The change in the magnetic flux is caused by rotation of a magnetic plate-like element having at least one cutout which moves past the magnetic detecting unit, and a permanent magnet fixedly held by the housing assembly of the compressor is arranged so as to increase the density of the magnetic flux circulating through the predetermined magnetic circuit whereby the change in the magnetic flux caused by the rotation of the magnetic plate-like element becomes rapid.
Abstract:
A swash plate type compressor with a malfunction detector, the detector comprising a detected unit embedded in part of the outer periphery of the swash plate of the compressor and a detecting unit fixedly mounted on part of the combined cylinder block of the compressor. The detected unit has a thermosensor and a permanent magnet embedded inwardly from the thermosensor. The detecting unit has a fixed magnetic member and an electric coil wound around the magnetic member.
Abstract:
A compressor of the present invention is provided with a plurality of housing members (a front housing, a cylinder block, and a rear housing) that forms a body, a fastener (a bolt member) for coupling the plurality of the housing members to one another, a drive shaft inserted through the body and coupled to a power source via an electromagnetic clutch, a movable member (a piston) that moves in association with the drive shaft to compress a fluid, a detection body that moves in association with the drive shaft, and a detection part for detecting a rotational state of the drive shaft by means of the detection body. A magnetic sensor having a magnetic impedance element constitutes the detection part. The magnetic sensor is provided on an outer lateral face side of the body and in proximity to the fastener.
Abstract:
A variable capacity wobble plate compressor includes a wobble plate (36) in the crank chamber (7) for adjusting the piston stroke; a control valve (45) for controlling the chamber pressure in the crank chamber to adjust the angle of the wobble plate; a pressure sensor (53); a rotary speed sensor (56); a heat load sensor (61); and/or a vibration sensor (62); and a control unit responsive to a signal from at least one of the sensors for controlling the control valve to prevent the compressor from entering an unstable zone.
Abstract:
A variable capacity wobble plate compressor of the type that a wobble plate mounted on a drive shaft is swung axially of the drive shaft as the drive shaft rotates, and pistons connected to the wobble plate make reciprocating motions in response to swinging of the wobble plate, wherein a change in the angularity of the wobble plate causes a change in stroke of the reciprocating motions of the pistons whereby the capacity of the compressor is varied. A sensing element arranged on the wobble plate is moved along a predetermined orbital path together with swinging of the wobble plate. A sensor arranged on a compressor housing generates an electric signal when the sensing element passes by the sensor as the wobble plate swings. A control unit determines the rotational speed of the compressor and the angularity of the wobble plate on the basis of the electric signal from the sensor. The sensor is so located as to align with a predetermined location between an axial center of the predetermined orbital path of swinging of the sensing element and an extreme possible point toward the pistons, when the wobble plate assumes the minimum angularity.
Abstract:
A compressor having a rotation sensor disposed in a portion provided for mounting a magnetic clutch. The rotation sensor is compressed of a detectable portion co-rotatable with a drive shaft of the compressor, and a detecting portion disposed on a cylindrical head in confronting relation to the detectable portion. The rotation sensor is disposed outside of a seal means disposed between the drive shaft and the cylinder head for providing a hermetic seal therebetween. With this construction, no separate seal means is necessary for the rotation sensor.
Abstract:
Disclosed is a device for controlling or measuring operational parameters of an axial piston machine. The tilting plate which engages and adjusts the stroke of the piston is provided with two opposite pivot pins supported in fixed bearings. At least one pivot pin is provided with a shearing stress sensor preferably in the form of a magnetoelastic feeler which produces electrical signals the pulsation of which is indicative of rotational speed and the magnitude of the signal is proportional to pressure applied by the pistons and thus to the delivery of the machine. A second sensor is coupled to the tilting plate to indicate the angular displacement of the latter. The output signals from the sensors are separated into the pressure dependent signals, frequency dependent signals and angular displacement signals which upon multiplication are applied to a programmable data processing unit. The output of the unit is supplied to a solenoid operated proportional valve which controls pressure fluid for hydraulic setting motors which adjust the angular displacement of the tilting plate.