Abstract:
A protecting device for a car air conditioner includes a timer for timing a period of the rise in the level of a rotation signal delivered from a rotation sensor for detecting a rotational speed of a compressor with the signal being distinguished from noise. On the basis of the obtained period, a judgment is made as to whether rotation of the compressor is in an abnormal state. An electromagnetic clutch between the compressor and a car engine is controlled on the basis of the judgment. The protecting device is mounted on a housing of the compressor with the rotation sensor so that wiring is executed only in an engine room. The protecting device includes a state holding device for memorizing the abnormal state of the rotation of the compressor. The air conditioner can restart on condition that a conscious operation is performed to reset the state holding device.
Abstract:
An acceleration responsive switch includes a receptacle including a housing having a conical face on an inner bottom face and a header fixed to the housing to close an open end of the housing, a lead terminal fixed in a through-aperture of the header, a contact member secured to an end of the lead terminal located in the housing and including a plurality of feather portions arranged radially to be approximately concentric with the housing, an electrically conductive inertia ball enclosed in the closed receptacle so as to be capable of rolling on the inner bottom face of the housing, a plurality of protrusions formed an inner peripheral wall of the housing, an oscillation damping liquid contained in the receptacle and having a viscosity suitable to apply resistance to the inertia ball so that the inertia ball terminates its rotation when the inertia ball is subjected to an external oscillation to be rotated. When subjected to acceleration, the inertia ball rolls to come into contact with one or more of the feather portions of the contact member so that it electrically conducts between the feather portions and the housing. The inertia ball in a rotational motion collides against the protrusion, changing the course of its movement.
Abstract:
A structure for mounting a thermal protector in a hermetic refrigeration compressor including an electric motor and a compressing means enclosed in a housing with refrigerant is disclosed. The housing has at least one through hole. The structure includes a terminal assembly airtightly secured in the hole of the housing. The terminal assembly includes a metal base and a plurality of electrically conductive terminal pins secured to the metal base by an electrically insulative material with small thermal conductivity. The structure further includes a thermal protector including a hermetic casing, a thermally responsive element disposed in the casing to be in direct contact with an inner wall of the casing at one side, and a contact mechanism. The thermal protector is mounted on a plurality of connection terminals connected to respective ends of the terminal pins located inside the compressor housing so as to be subjected to heat from at least one of the motor, compressing means and the refrigerant, so that the thermal protector is positioned to occupy a predetermined position.
Abstract:
A fixing method and assembly of a temperature responsive element capable of detecting variation in temperature of discharge cooling medium of a compressor exactly and rapidly and preventing the compressor from being burned. A through hole is formed in a cover 6 which covers a path 7B for discharge cooling medium of the compressor. A plug 9 is fixed to the through hole from the side of the path by a fixing member 13. In this case, it is sealed airtightly by means of a packing. Lead terminal pins penetrating the plug 9 is insulatively fixed in the plug airtightly. Leads are connected to one ends of the lead terminal pins projecting outside and the temperature responsive clement 8 is connected to the other ends of the lead terminal pins projecting on the side of the discharge path. The temperature responsive clement 8 is disposed not to come into direct contact with a vessel and the cover 6 of the compressor and is exposed to discharge cooling medium as a whole. Consequently, the temperature responsive element can detect a temperature of the discharge cooling medium exactly and rapidly without influence of external disturbance such as heat from the outside and a path 7A for suction cooling medium.
Abstract:
A thermal protector includes a metal housing having open and closed ends, a header plate secured to the housing so as to close its open end and having two through-apertures, first and second terminal pins hermetically secured in the respective apertures of the header plate so as to extend into the housing, a dish-shaped bimetal disposed on an inner bottom of the housing so that one of its two sides is in contact with the inner bottom face of the housing, an elastic support disposed in the housing to be opposite to the other side of the bimetal for supporting it, a pair of fixed and movable contact members welded to the first and second terminal pins respectively such that a straight line passing through the center of the first terminal pin and a location of the fixed contact member welded to the first terminal pin is approximately parallel to a straight line passing through the center of the second terminal pin and a location of the movable contact member welded to the second terminal pin and vice versa and further such that the location of the fixed contact member welded to the first terminal pin is not substantially opposed to the location of the movable contact member welded to the second terminal pin and vice versa, and a pressure strip disposed between the support and the movable contact member for transmitting movement of the support due to reversion of the bimetal to the movable contact member.
Abstract:
A three-phase thermal protector includes a hermetic receptacle composed of an elliptic dome-shaped cover having an opening at one end and a header plate having two terminal pins extending through respective apertures formed in it, and a switch assembly mounted in the receptacle. Two fixed contacts are secured to the respective terminal pins. The switch assembly includes a metal operating temperature calibrating plate with one end welded to the cover, a bimetallic thermally responsive element having one end secured to the calibrating plate and the other end having a central dish-shaped portion, and a thermally-responsive-element support to which the supported end of the thermally responsive element is welded. The thermally responsive element carries two movable contacts symmetrical about the center line. The calibrating plate has a push projection pushing the thermally responsive element so that the contact pressure is increased when the calibrating plate is deformed with deformation of the cover for the calibration of the operating temperature. The header plate has a protrusion receiving the thermally responsive element at a position away from its supported end toward the center.