Abstract: Disclosed are a remote control system for a home appliance network and a method for operating the same. The system includes a wired and wireless Internet network; at least one home server for controlling and managing a home network connected to a plurality of home appliances; and a central portal server for updating an IP (Internet Protocol) address to a varied IP address to manage the home server whenever an IP address allocated to the home server for using the Internet network varies, and for exchanging data with the home server. The system and method enable the central portal server to manage a plurality of home servers and remotely control a plurality of home appliances connected to the home network by allowing the home server to transmit a key message containing a varied IP address so that an existing IP address stored in a database of the central portal server can be updated to a new IP address when a home server using a dynamic IP is connected to the central portal server.

Abstract: Disclosed herein are a home appliance network system and a method for operating the same. The home appliance network system comprises a plurality of home appliances connected to a network constructed in a home for transmitting and receiving data over the network, and a home server including a device monitoring module for independently storing and updating state information or product information of a specific one of the home appliances based on an input control command. When a user monitors product information of the home appliances to control the home appliances, the home server more rapidly displays the product information, resulting in an improvement in control speed. Further, the home server uses a smaller amount of network system resources, thereby enabling efficient networking to be made.

Abstract: The invention relates to a reverse rotation preventing structure of a centrifugal compressor. The reverse rotation preventing structure of the centrifugal compressor comprises: a discharge pipeline of the centrifugal compressor; a suction pipeline of the centrifugal compressor; a bypass pipeline for connecting the discharge pipeline and the suction pipeline, wherein a predetermined valve is formed thereon; a control means for controlling an operation of the centrifugal compressor; and a detecting means for generating a predetermined signal to the control means if the operation of the centrifugal compressor is suddenly stopped, thereby opening the bypass pipeline.

Abstract: A home network system including a protocol converter for converting protocols such that a passive home appliance and a home server connected to a network smoothly communicate signals based on different protocols with each other and a method for operating the home network system. The protocol converter converts a status information signal based on a home appliance protocol from the passive home appliance to transmit it to the home server. The protocol converter converts a control signal based on a home server protocol from the home server to transmit it to the passive home appliance. Therefore, the home server can be compatible with the passive home appliance irrespective of manufacturer and/or protocol of the passive home appliance connected to the network. Compatibility and applicability of the home network system are thus extended and simultaneously the home network system becomes more cost-effective.

Abstract: A system for cooling a turbo compressor includes two compressing parts on opposite ends of a rotational shaft driven by a motor. Fluid from a fluid chamber within the casing of the device is supplied to a bearing chamber when the temperature of the bearing chamber increases. A supply passage is formed in a first support where the radial bearing for supporting a load in the axial direction is formed. The open-and-shut valve supplies fluid when the temperature of the bearing chamber increases.

Abstract: A turbo compressor is provided which includes a motor having a stator with a rotor which rotates in the inside of the stator. A rotation shaft is press-fitted into the rotor and is integrally rotated with the rotor. A bearing is provided for supporting the rotation shaft of the motor. At least one impeller is attached to the rotation shaft of the motor and rotated therewith. A foil bearing including a plurality of foils is provided. First ends of the foils are respectively fitted into a multitude of engaging grooves defined on a circumferential inner surface of the stator, and second ends of the foils make contact with a circumferential outer surface of the rotor.

Abstract: Disclosed are a system for remotely controlling home appliances and a method for operating the same. The system for remotely controlling home appliances, includes: a wired and wireless Internet network; a home server for controlling and managing a home network connected to the home appliances; a central portal server for exchanging XML (extensible Markup Language) format data with the home server connected through the Internet network; and remote control equipment connected to the Internet network for remotely controlling the home appliances and forwarding a control command to the central portal server. The system and method can reduce a load of the home server and the central portal server and prevent the delay of data transmission, because an additional data format conversion process is not needed.

Abstract: A cooling system, which includes a compressor for compressing the refrigerant by operation of a motor, a condenser, an expansion means, and an evaporator, comprises a motor cooling device for cooling down the motor by making some of the refrigerant passed the condenser flow to the compressor according to temperature of the motor, and therefore the heat of high temperature generated from the motor in the compressor during the operation of the compressor which is used in the cooling system can be cooled down efficiently.

Abstract: Disclosed are a remote control system for a home appliance network and a method for operating the same. The system includes a wired and wireless Internet network; at least one home server for controlling and managing a home network connected to a plurality of home appliances; and a central portal server for updating an IP (Internet Protocol) address to a varied IP address to manage the home server whenever an IP address allocated to the home server for using the Internet network varies, and for exchanging data with the home server. The system and method enable the central portal server to manage a plurality of home servers and remotely control a plurality of home appliances connected to the home network by allowing the home server to transmit a key message containing a varied IP address so that an existing IP address stored in a database of the central portal server can be updated to a new IP address when a home server using a dynamic IP is connected to the central portal server.

Abstract: The invention relates to a reverse rotation preventing structure of a centrifugal compressor. The reverse rotation preventing structure of the centrifugal compressor comprises: a discharge pipeline of the centrifugal compressor; a suction pipeline of the centrifugal compressor; a bypass pipeline for connecting the discharge pipeline and the suction pipeline, wherein a predetermined valve is formed thereon; a control means for controlling an operation of the centrifugal compressor; and a detecting means for generating a predetermined signal to the control means if the operation of the centrifugal compressor is suddenly stopped, thereby opening the bypass pipeline.

Abstract: A cooling system, which includes a compressor for compressing the refrigerant by operation of a motor, a condenser, an expansion means, and an evaporator, comprises a motor cooling device for cooling down the motor by making some of the refrigerant passed the condenser flow to the compressor according to temperature of the motor, and therefore the heat of high temperature generated from the motor in the compressor during the operation of the compressor which is used in the cooling system can be cooled down efficiently.

Abstract: A turbo compressor includes: a casing having a fluid chamber for receiving a fluid from an external source; a driving unit disposed in the casing and generating a rotational force; a first compressing part installed at one side of a rotational shaft rotated according to the driving of the driving unit and first compressing the fluid; a second compressing part installed at the other side of the rotational shaft and secondly compressing the fluid compressed in the first compressing part; and a bearing cooling unit for supplying a fluid of the fluid chamber to a bearing chamber to perform a cooling operation when a temperature of the bearing chamber where the thrust bearing for supporting a load working in an axial direction of the rotational shaft is mounted is increased, and cutting off the fluid from being introduced into the bearing chamber when the temperature of the bearing chamber is maintained at a proper level.

Abstract: Disclosed is a turbo compressor. The turbo compressor comprising a motor having a stator with a rotor which rotates in the inside of the stator and a rotation shaft which is press-fitted into the rotor and integrally rotated with the rotor, a bearing means for supporting the rotation shaft of the motor, at least one impeller attached to the rotation shaft of the motor and rotated therewith and a foil bearing including a plurality of foils which one ends thereof are respectively fitted into a multitude of engaging grooves defied on a circumferential inner surface of the stator, and the other ends thereof make contact with a circumferential outer surface of the rotor.