摘要:
A polyamic acid that is a condensation reaction product of one or more acid anhydrides and one or more carbonate-based diamine compounds, along with a polyimide obtained by imidizing the polyamic acid, a method of manufacturing the same, and a polyimide film made therefrom.
摘要:
A polymer including a structure represented by the following Chemical Formula 1, and a composition and a film including the same are provided. In the above Chemical Formula 1, each substituent is as defined in the detailed description.
摘要:
Disclosed are an organosilicate compound represented by the following Chemical Formula 1, and a composition and a film including the same. In the above Chemical Formula 1, each substituent is as defined in the detailed description.
摘要:
A rotary compressor is provided, in which an inner diameter of a connection hole connected to a vane chamber and an outer diameter of a connection tube inserted into the connection hole are designated so that the connection tube can closely be adhered to the connection hole, thereby preventing a refrigerant from being leaked out between the connection hole and the connection tube so as to allow a fast and accurate mode switching of the vane, resulting in improvement of the performance of the compressor and prevention of noise caused by vibration of the vane.
摘要:
Disclosed is a variable capacity type rotary compressor (1), a cooling apparatus having the same, and an operation method thereof, wherein in the variable capacity type rotary compressor (1) and the cooling apparatus having the same, a discharge pressure to be supplied to a rear side of a second vane (430) disposed in the compressor (1) is supplied after being higher than a reference pressure, so that the compressor (1) can be switched from a saving mode into a power mode, whereby the second vane (430) can be press-contacted with a second rolling piston (420) with fast and accurately moving without vibration, resulting in preventing beforehand noise occurrence or efficiency degradation due to the vibration of the second vane (430) when the compressor (1) or the cooling apparatus having the compressor (1) is operated in the power mode.
摘要:
An apparatus and method for controlling an operation of a compressor are disclosed to enhance a compressor efficiency in each operation mode in operating a compressor in a power mode or power saving mode according to an external load. The apparatus for controlling an operation of a compressor, including: a controller that generates a control signal to select an operation mode of the compressor according to an operation load of the compressor; a compressor motor that includes a main coil and a sub-coil and is driven in one of a plurality of operation modes according to a control signal of the controller; and a power supply unit that applies power via capacitors each having a different capacitance to the sub-coil of the compressor motor according to a control signal of the controller.
摘要:
The present invention provides a 2 stage rotary compressor including a hermetic container (101) defining an outward appearance of the compressor (100), a 2 stage compression assembly provided in the hermetic Container, wherein a low pressure cylinder (121), a middle plate (140) and a high pressure cylinder (131) successively stacked from any one of upper and lower portions, and first discharge port (161p) discharging refrigerant compressed in the low pressure cylinder (121), and having an inner volume equivalent to 0.5% to 2.5% of an inner volume of the low pressure cylinder (121). A valve is installed on or under the discharge port. When the valve is opened, compressed refrigerant is discharged through the discharge port. When the valve is closed, refrigerant remains in the discharge port as much as the volume of the discharge port. Accordingly, refrigerant remaining in the discharge port is re-expanded in the cylinder to thereby cause a compression loss. Moreover, in a case where the volume of the discharge port is excessively small, a resistance occurs in a refrigerant passage. As a result, the volume of the discharge port should he appropriately restricted.
摘要:
A compressor and an air-conditioner having a compressor are provided. The air-conditioner may be operated in a pre-set operation mode according to a detected application voltage or in a pre-set operation mode according to a pre-set time domain. A compressor temperature or an ambient temperature may be detected to operate the air-conditioner in the pre-set operation mode according to the detected application voltage or in the pre-set operation mode according to the pre-set time domain to continuously operate the compressor.
摘要:
A variable capacity type rotary compressor, in which a refrigerant sucked in via one suction pipe can be alternately sucked into each compression space via a communication passage between cylinders so as to reduce a number of components and a number of assembly processes, thereby reducing fabrication costs. A refrigerant within an idling cylinder is prevented from flowing back into another cylinder so as to improve performance of the compressor. A welding space can be ensured when connecting connection pipes so as to realize a welding automation, thereby further reducing the fabrication cost, and a mode switching valve is stably fixed to an appropriate position so as to attenuate noise due to vibration of compressor.
摘要:
Disclosed is a variable capacity type rotary compressor, in which a refrigerant sucked via one suction pipe can be alternately sucked into each compression space via a communication passage between a plurality of cylinders so as to reduce the number of components and the number of assembly processes, thereby remarkably reducing a fabricating cost, a refrigerant within an idling cylinder can be prevented from flowing back into another cylinder so as to improve the performance of the compressor, a welding space can be ensured when connecting connection pipes so as to realize a welding automation, thereby further reducing the fabricating cost, and a mode switching valve can be stably fixed to an appropriate position so as to attenuate noise due to vibration of the compressor.