| 摘要 |
PROBLEM TO BE SOLVED: To provide a two cylinder rotary compressor capable of varying capacity of full capacity operation and half capacity operation and surely improving efficiency in half capacity operation while securing reliability, and to improve refrigeration cycle efficiency by providing the two cylinder rotary compressor. SOLUTION: Compression mechanism parts 3A, 3B includes an intermediate partition plate 2, a first cylinder 6A, a second cylinder 6B, a first cylinder chamber Sa, a main bearing 7, a second cylinder chamber Sb, an auxiliary bearing 8, two eccentric parts "a", "b" on a rotary shaft 5, a main shaft part 5a, an auxiliary shaft part 5b, and two eccentric rollers 9a, 9b, and is provided with a change over mechanism K capable of changing over compression operation and non-compression operation in the second cylinder chamber. An auxiliary shaft part shaft diameter ϕDb of the rotary shaft pivotally supported by the auxiliary bearing satisfies an expression (1) (√(L1/(L2+L3)))×ϕDa≤ϕDb≤L4/0.43-2×E, where ϕDa: a main shaft part shaft diameter of the rotary shaft pivotally supported by the main bearing. L1: axial distance from axial center position of the first cylinder to axial load position of the rotary shaft main shaft part (distance of half of the main shaft part shaft diameter from a first cylinder chamber side end part in the main shaft part). L2: axial distance from axial center position of the first cylinder to axial center position of the second cylinder. L3: axial distance from axial center position of the second cylinder to axial load position of the rotary shaft auxiliary shaft part (distance of half of the auxiliary shaft part shaft diameter from a secondary cylinder chamber side end part in the auxiliary shaft part). L4: slide length of an eccentric roller and an eccentric part of the rotary shaft. E: eccentric quantity of the eccentric part of the rotary shaft. COPYRIGHT: (C)2010,JPO&INPIT
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