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A capacity varying type rotary compressor and a refrigeration system having the same are provided. The capacity varying type rotary compressor includes a casing that contains a certain amount of oil and maintains a discharge pressure state; a motor installed in the casing that generates a driving fo

A capacity varying type rotary compressor and a refrigeration system having the same are provided. The capacity varying type rotary compressor includes a casing that contains a certain amount of oil and maintains a discharge pressure state; a motor installed in the casing that generates a driving force; one or more cylinder assembly fixed in the casing, having a compression space that compresses a refrigerant by a rolling piston that performs an orbit motion and a vane that performs a linear motion by contacting the rolling piston, and having a vane pressure chamber formed at a rear side of the vane that implements a normal driving as the vane contacts the rolling piston or a saving driving as the vane is separated from the rolling piston; and a mode switching device that selectively supplies a suction pressure or a discharge pressure to the vane pressure chamber of the cylinder assembly according to a driving mode.

대표청구항 ▼

The invention claimed is: 1. A capacity varying type rotary compressor, comprising: a casing that contains a certain amount of oil and a refrigerant maintained at a discharge pressure in an inner space of the casing and having a gas discharge pipe that communicates with the inner space; a motor fix

The invention claimed is: 1. A capacity varying type rotary compressor, comprising: a casing that contains a certain amount of oil and a refrigerant maintained at a discharge pressure in an inner space of the casing and having a gas discharge pipe that communicates with the inner space; a motor fixedly installed in the inner space of the casing that generates a driving force; a first cylinder fixedly installed in the inner space of the casing, having a first compression space to compress the refrigerant, and having a first inlet that supplies the refrigerant at a suction pressure to the first compression space; a second cylinder fixedly installed in the inner space of the casing positioned at one side of the first cylinder, having a second compression space to compress the refrigerant separately from the first compression space of the first cylinder, and having a second inlet that supplies the refrigerant at a suction pressure to the second compression space; an upper bearing installed at an upper side of the first cylinder such that the upper bearing covers the upper side of the first cylinder, and having a first outlet that communicates with the first compression space; a lower bearing installed at a lower side of the second cylinder such that the lower bearing covers the lower side of the second cylinder, and having a second outlet that communicates with the second compression space; a middle bearing that separates the first and second cylinders from each other; a first rolling piston that performs an orbit motion in the first compression space of the first cylinder; a second rolling piston that performs an orbit motion in the second compression space of the second cylinder; a first vane coupled to the first cylinder that performs a linear motion by contacting the first rolling piston; a second vane coupled to the second cylinder that performs a linear motion by contacting the second rolling piston; a vane pressure chamber formed in the second cylinder at a rear side of the second vane in the inner space of the casing, and sealed by the lower and middle bearings such that the vane pressure chamber is separated from the inner space of the casing; a suction pressure side connection pipe connected to the second inlet by passing through the casing; a discharge pressure side connection pipe connected to the inner space of the casing by passing through the casing; a common side connection pipe connected to the vane pressure chamber by passing through the casing; a first mode switching valve connected to the suction pressure side connection pipe, the discharge pressure side connection pipe, and the common side connection pipe, that selectively connects the suction pressure side connection pipe and the discharge pressure side connection pipe to the common side connection pipe; a second mode switching valve connected to the first mode switching valve, that connects the suction pressure side connection pipe and the discharge pressure side connection pipe to the first mode switching valve to control the first mode switching valve; an accumulator fixed to the casing; and a connection device that couples the first mode switching valve to an outer circumferential surface of the accumulator. 2. The rotary compressor of claim 1, wherein the discharge side connection pipe communicates with the inner space of the casing from the lower side of the second cylinder, such that the oil inside the casing is supplied to the vane pressure chamber when the compressor performs a normal driving. 3. The rotary compressor of claim 2, wherein the oil inside the casing is supplied to the vane pressure chamber via the first and second mode switching valves. 4. The rotary compressor of claim 1, further comprising a vane restricting device that restricts the second vane under a state in which the second vane is separated from the second rolling piston. 5. The rotary compressor of claim 4, wherein the vane restricting device restricts the second vane by inducing a high pressure inside the casing to a lateral surface or upper and lower surfaces of the second vane and thus by adhering the second vane to the second cylinder. 6. The rotary compressor of claim 5, wherein the motor is a constant speed motor. 7. The rotary compressor of claim 5, wherein the motor is a variable speed motor. 8. The rotary compressor of claim 5, wherein the connection device includes one or more brackets each having one end fixed to the outer circumferential surface of the accumulator by welding or bolting and another end fixed to an outer circumferential surface of the first mode switching valve by welding or bolting. 9. The rotary compressor of claim 5, wherein the connection device includes: a first bracket fixed to the accumulator by welding or bolting; and a second bracket fixed to the first bracket and the first mode switching valve by welding or bolting. 10. The rotary compressor of claim 5, wherein the connection device includes one or more clamps each having one end that elastically supports the first mode switching valve in a winding manner and another end fixed to the accumulator by welding or bolting. 11. A refrigeration system comprising a capacity varying type rotary compressor, a condenser, an expansion valve, and an evaporator as a closed circuit, the capacity varying type rotary compressor comprising: a casing that contains a certain amount of oil and a refrigerant maintained at a discharge pressure in an inner space of the casing and having a gas discharge pipe that communicates with the inner space; a motor fixedly installed in the inner space of the casing that generates a driving force; a first cylinder fixedly installed in the inner space of the casing, having a first compression space to compress the refrigerant, and having a first inlet that supplies the refrigerant at a suction pressure to the first compression space; a second cylinder fixedly installed in the inner space of the casing positioned at one side of the first cylinder, having a second compression space to compress the refrigerant separately from the first compression space of the first cylinder, and having a second inlet that supplies the refrigerant at a suction pressure to the second compression space; an upper bearing installed at an upper side of the first cylinder such that the upper bearing covers the upper side of the first cylinder, and having a first outlet that communicates with the first compression space; a lower bearing installed at a lower side of the second cylinder such that the lower bearing covers the lower side of the second cylinder, and having a second outlet that communicates with the second compression space; a middle bearing that separates the first and second cylinders from each other; a first rolling piston that performs an orbit motion in the first compression space of the first cylinder; a second rolling piston that performs an orbit motion in the second compression space of the second cylinder; a first vane coupled to the first cylinder that performs a linear motion by contacting the first rolling piston; a second vane coupled to the second cylinder that performs a linear motion by contacting the second rolling piston; a vane pressure chamber formed in the second cylinder at a rear side of the second vane in the inner space of the casing, and sealed by the lower and middle bearings such that the vane pressure chamber is separated from the inner space of the casing; a suction pressure side connection pipe connected to the second inlet by passing through the casing; a discharge pressure side connection pipe connected to the inner space of the casing by passing through the casing; a common side connection pipe connected to the vane pressure chamber by passing through the casing; a first mode switching valve connected to the suction pressure side connection pipe, the discharge pressure side connection pipe, and the common side connection pipe, that selectively connects the suction pressure side connection pipe and the discharge pressure side connection pipe to the common side connection pipe; a second mode switching valve connected to the first mode switching valve, that connects the suction pressure side connection pipe and the discharge pressure side connection pipe to the first mode switching valve to control the first mode switching valve; an accumulator fixed to the casing; and a connection device that couples the first mode switching valve to an outer circumferential surface of the accumulator.