A capacity varying rotary compressor is provided. The compressor includes a cylinder mounted in a casing, and a vane pressure chamber provided at a rear side of a vane that divides an inner space of the cylinder into a suction chamber and a compression chamber. A pressure controlling unit supplies a
A capacity varying rotary compressor is provided. The compressor includes a cylinder mounted in a casing, and a vane pressure chamber provided at a rear side of a vane that divides an inner space of the cylinder into a suction chamber and a compression chamber. A pressure controlling unit supplies a discharge pressure or a suction pressure to the vane pressure chamber to thereby restrict or release a motion of the vane. A pressure leakage preventing unit couples the cylinder and bearings positioned at opposite sides of the cylinder to form the vane pressure chamber. A capacity to compress and discharge a refrigerant may be varied according to a load, thereby reducing power consumption of the compressor and simplifying assembly. Furthermore, pressure leakage from the vane pressure chamber may be prevented, thereby enhancing a capacity varying function.
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The invention claimed is: 1. A capacity varying rotary compressor, comprising: a first cylinder and a second cylinder provided in a casing, the first and second cylinders being coupled to a rotary shaft by first and second rolling pistons; an upper bearing positioned at an upper surface of the firs
The invention claimed is: 1. A capacity varying rotary compressor, comprising: a first cylinder and a second cylinder provided in a casing, the first and second cylinders being coupled to a rotary shaft by first and second rolling pistons; an upper bearing positioned at an upper surface of the first cylinder, a middle bearing positioned between a lower surface of the first cylinder and an upper surface of the second cylinder, and a lower bearing positioned at a lower surface of the second cylinder; a vane that divides an inner space of the second cylinder into a suction chamber and a compression chamber; a vane pressure chamber formed at a rear portion of the vane, defined by the second cylinder and the middle and lower bearings; a pressure controlling unit that supplies a discharge pressure or a suction pressure to the vane pressure chamber so as to restrict or release a motion of the vane; a connection unit that extends from a connection pipe of the pressure controlling unit, through the casing, and to the vane pressure chamber formed in the second cylinder so as to supply the discharge pressure or the suction pressure to the vane pressure chamber; and a coupling unit that couples the cylinder and the middle and lower bearings to each other so as to prevent a leakage of pressure from the vane pressure chamber, wherein the vane pressure chamber comprises a pressure space that extends from a vane slot formed in the second cylinder, and wherein the coupling unit is coupled to extension portions of each of the first middle and second lower bearings such that the extension portions hermetically seal the pressure space of the second cylinder. 2. A capacity varying rotary compressor, comprising: a first cylinder and a second cylinder provided in a casing, the first and second cylinders being coupled to a rotary shaft by first and second rolling pistons; an upper bearing positioned at an upper surface of the first cylinder, a middle bearing positioned between a lower surface of the first cylinder and an upper surface of the second cylinder, and a lower bearing positioned at a lower surface of the second cylinder; a vane that divides an inner space of the second cylinder into a suction chamber and a compression chamber; a vane pressure chamber formed at a rear portion of the vane, defined by the second cylinder and the middle and lower bearings; a pressure controlling unit that supplies a discharge pressure or a suction pressure to the vane pressure chamber so as to restrict or release a motion of the vane; a connection unit that extends from a connection pipe of the pressure controlling unit, through the casing, and to the vane pressure chamber formed in the second cylinder so as to supply the discharge pressure or the suction pressure to the vane pressure chamber, wherein the connection unit is a stepped connection tube comprising: a first pipe portion that penetrates through the casing and into the second cylinder so as to connect the vane pressure chamber to an outside of the casing; and a second pipe portion that extends from the first pipe portion to the connection pipe, wherein the first pipe portion of the stepped connection tube is formed of steel, and the second pipe portion of the stepped connection tube is formed of copper; and a coupling unit that couples the cylinder and the middle and lower bearings to each other so as to prevent a leakage of pressure from the vane pressure chamber. 3. A capacity varying rotary compressor, comprising: a first cylinder and a second cylinder provided in a casing, the first and second cylinders being coupled to a rotary shaft by first and second rolling pistons; an upper bearing positioned at an upper surface of the first cylinder, a middle bearing positioned between a lower surface of the first cylinder and an upper surface of the second cylinder, and a lower bearing positioned at a lower surface of the second cylinder; a vane that divides an inner space of the second cylinder into a suction chamber and a compression chamber; a vane pressure chamber formed at a rear portion of the vane, defined by the second cylinder and the middle and lower bearings; a pressure controlling unit that supplies a discharge pressure or a suction pressure to the vane pressure chamber so as to restrict or release a motion of the vane; a connection unit that extends from a connection pipe of the pressure controlling unit, through the casing, and to the vane pressure chamber formed in the second cylinder so as to supply the discharge pressure or the suction pressure to the vane pressure chamber, wherein the connection unit comprises: a first connection tube that penetrates through the casing and into the second cylinder so as to connect the vane pressure chamber to an outside of the casing; and a second connection tube having a first end coupled to the first connection tube and a second end coupled to the connection pipe, wherein an inner diameter of the second connection tube corresponds to an outer diameter of the first connection tube, and wherein the first connection tube is formed of steel, and the second connection tube is formed of copper; and a coupling unit that couples the cylinder and the middle and lower bearings to each other so as to prevent a leakage of pressure from the vane pressure chamber. 4. A capacity varying rotary compressor, comprising: a first cylinder and a second cylinder provided in a casing, the first and second cylinders being coupled to a rotary shaft by first and second rolling pistons; an upper bearing positioned at an upper surface of the first cylinder, a middle bearing positioned between a lower surface of the first cylinder and an upper surface of the second cylinder, and a lower bearing positioned at a lower surface of the second cylinder; a vane that divides an inner space of the second cylinder into a suction chamber and a compression chamber; a vane pressure chamber formed at a rear portion of the vane, defined by the second cylinder and the middle and lower bearings; a pressure controlling unit that supplies a discharge pressure or a suction pressure to the vane pressure chamber so as to restrict or release a motion of the vane; a connection unit that extends from a connection pipe of the pressure controlling unit, through the casing, and to the vane pressure chamber formed in the second cylinder so as to supply the discharge pressure or the suction pressure to the vane pressure chamber, wherein the connection unit comprises: a first connection tube that penetrates through the casing and into the second cylinder so as to connect the vane pressure chamber to an outside of the casing; and a second connection tube having a first end coupled to the first connection tube and a second end coupled to the connection pipe, wherein an inner diameter of the second connection tube corresponds to an outer diameter of the first connection tube, and wherein the first connection tube is formed of steel, the second connection tube is formed of copper, and the connection pipe is formed of copper; and a coupling unit that couples the cylinder and the middle and lower bearings to each other so as to prevent a leakage of pressure from the vane pressure chamber.
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이 특허에 인용된 특허 (6)
Kim Jin Dong,KRX ; Lee Byung Chan,KRX, Resonator for rotary compressor.
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