Abstract: The present invention provides a pharmaceutical composition for prevention or treatment of a stress disease and depression, the pharmaceutical composition be safely useable without toxicity and side effects by using an extract of leaves of Vaccinium bracteatum Thunb., which is natural resource of Korea, so that the reduction of manufacturing and production costs and the import substitution and export effects can be expected through the replacement of a raw material for preparation with a plant inhabiting in nature.

Abstract: Provided are a silicon nitride film etching composition, a method of etching a silicon nitride film using the same, and a manufacturing method of a semiconductor device. Specifically, a silicon nitride film may be stably etched with a high selection ratio relative to a silicon oxide film, and when the composition is applied to an etching process at a high temperature and a semiconductor manufacturing process, not only no precipitate occurs but also anomalous growth in which the thickness of the silicon oxide film is rather increased does not occur, thereby minimizing defects and reliability reduction.

Abstract: A hermetic compressor to conduct electricity to a stator coil without peeling off a coating formed on the coil while preventing the separation of the stator coil or lead wire from a compressible terminal. In the hermetic compressor including a hermetic container, a compression device to compress a refrigerant, a drive device to drive the compression device, the drive device including a stator formed by winding the stator coil on a core and a rotor to rotate inside the stator, the lead wire extending from a terminal block to receive electricity, and a compressible terminal to be compressed after the stator coil and the lead wire are inserted into the compressible terminal, the stator coil is formed by covering an aluminum wire with an enamel coating, and the compressible terminal includes electricity-conduction protrusions to piece the enamel coating so as to come into contact with the aluminum wire.

Abstract: A hermetic type compressor in which manufacturing costs can be reduced, wherein a connection between stator coils wound around a stator and lead wires of a terminal block, is prevented from being cut, and a manufacturing method of the same. The compressor includes a sealed casing, a compression device, a driving unit having a stator, including stator coils wound around a core and a rotor rotating within the stator to drive the compression device, lead wires extended from a terminal block coupled with the a terminal installed to the sealed casing to supply electric current, and a connected part formed by which the stator coils are made by coating aluminum wires with enamel, the ends of the stator coils whose enameling is removed are connected to the lead wires to supply the electric current, and the entire ends of the aluminum wires whose enameling is removed and exposed are inserted into a joint band to connect the ends of the stator coils to ends of the lead wires.

Abstract: A cylinder assembly for a hermetic compressor is capable of reducing impulse and noise that is generated by a contact of a valve plate and a suction valve when the suction valve is closed. The cylinder assembly has a cylinder block having a cylinder formed therein; a cylinder head connected to the cylinder block, for sealing the cylinder off from outside; a valve plate disposed between the cylinder block and the cylinder head, the valve plate having a refrigerant suction hole; a suction valve disposed at a side of the valve plate for resiliently opening and closing the refrigerant suction hole; and a noise/impulse reducing device disposed between the suction valve and the valve plate so that the noise/impulse reducing device first contacts with the suction valve prior to contacting with the valve plate. During the refrigerant compression in the cylinder, the impulse and noise, which is generated by the hitting movement of the suction valve 38a against the valve plate, is reduced.

Abstract: A valve assembly of a close-type reciprocal compressor. The valve assembly includes a valve plate disposed between a cylinder body and a cylinder head, a reed valve for opening and sealing a refrigerant discharge hole formed at the valve plate, a first stopper for resisting against a bending force of the reed valve bent when the refrigerant is discharged, a second stopper for resisting against a bending force of the first stopper by the reed valve, a keeper for limiting bending degree of the second stopper by the first stopper, and a bolt engaged with the keeper for connecting with the stopper bent by the reed valve. When refrigerant discharge pressure is increased, the resisting force against the bending force is added by the first stopper and the second stopper in turn, and thus compressing efficiency is increased by changing opening degree of the reed valve corresponding to the change of the pressure, and at the same time, noise can be reduced by lessening shock added to the reed valve.

Abstract: A valve apparatus for a hermetic compressor including a valve plate having a refrigerant discharging hole for discharging a refrigerant, a discharging valve having one end fixed at the valve plate and another end for opening and closing the refrigerant discharging hole, a stopper having one end fixed at the valve plate in order to support the discharging valve, a keeper disposed at an upper part of the stopper at a predetermined distance from the stopper and fixed at the valve plate, a first shock absorbing means for buffering an opening and a closing of the stopper by being disposed at the keeper, and a second shock absorbing means disposed at the keeper in order to move up and down. The second shock absorbing means is for buffering the opening and the closing of the stopper together with the first shock absorbing means.

Abstract: A cylinder assembly for a hermetic compressor is capable of reducing impulse and noise that is generated by a contact of a valve plate and a suction valve when the suction valve is closed. The cylinder assembly has a cylinder block having a cylinder formed therein; a cylinder head connected to the cylinder block, for sealing the cylinder off from outside; a valve plate disposed between the cylinder block and the cylinder head, the valve plate having a refrigerant suction hole; a suction valve disposed at a side of the valve plate for resiliently opening and closing the refrigerant suction hole; and a noise/impulse reducing device disposed between the suction valve and the valve plate so that the noise/impulse reducing device first contacts with the suction valve prior to contacting with the valve plate. During the refrigerant compression in the cylinder, the impulse and noise, which is generated by the hitting movement of the suction valve 38a against the valve plate, is reduced.

Abstract: A valve apparatus for a hermetic compressor including a valve plate having a refrigerant discharging hole for discharging a refrigerant, a discharging valve having one end fixed at the valve plate and another end for opening and closing the refrigerant discharging hole, a stopper having one end fixed at the valve plate in order to support the discharging valve, a keeper disposed at an upper part of the stopper at a predetermined distance from the stopper and fixed at the valve plate, a first shock absorbing means for buffering an opening and a closing of the stopper by being disposed at the keeper, and a second shock absorbing means disposed at the keeper in order to move up and down. The second shock absorbing means is for buffering the opening and the closing of the stopper together with the first shock absorbing means.

Abstract: A valve assembly of a close-type reciprocal compressor. The valve assembly includes a valve plate disposed between a cylinder body and a cylinder head, a reed valve for opening and sealing a refrigerant discharge hole formed at the valve plate, a first stopper for resisting against a bending force of the reed valve bent when the refrigerant is discharged, a second stopper for resisting against a bending force of the first stopper by the reed valve, a keeper for limiting bending degree of the second stopper by the first stopper, and a bolt engaged with the keeper for connecting with the stopper bent by the reed valve. When refrigerant discharge pressure is increased, the resisting force against the bending force is added by the first stopper and the second stopper in turn, and thus compressing efficiency is increased by changing opening degree of the reed valve corresponding to the change of the pressure, and at the same time, noise can be reduced by lessening shock added to the reed valve.

Abstract: In a reciprocating compressor, a piston reciprocates to compress a gas, and the compressed gas communicates with a discharge opening formed in a valve plate to force open a discharge valve apparatus mounted on the valve plate. The discharge valve apparatus includes a discharge valve and a stopper disposed behind the discharge valve. The discharge valve includes a fixing or anchoring portion and a movable portion which is flexibly movable relative to the fixing portion for opening and closing the discharge opening. The stopper limits the opening angle that can be achieved by the movable portion of the valve. The stopper forms a corner that bears against the valve. The corner extends at an oblique angle relative to a longitudinal axis of the valve in order to attenuate vibration in the movement portion of the valve before it reaches the fixing portion, thereby stabilizing the valve.