| 摘要 |
PURPOSE:To invariably keep the temperature of a compressor adequate by providing a device detecting the temperatures of bypass holes and the compressor and opening/closing the bypass holes on part of the oil cooler in a closed casing and controlling the quantity of a refrigerant flowing through the said cooler. CONSTITUTION:When a compressor is operated while the outside air temperature is high in such a season as summer, the temperature in a closed casing 1 becomes high. Thereby, the coil 33 of an opening/closing device 30 is extended to locate a sleeve tube 31 near the end section of an oil cooling section 21b, i.e., on bypass holes 29, 29 formed at positions above the lubricating oil 17. That is, the opening/closing device 30 closes the bypass holes 29, 29, thus the high-temperature gas refrigerant discharged in the casing 1 flows to the oil cooling section 21b through a rising pipe, a heat radiator, and a trailing pipe (not down in the figure) and effectively cools the lubricating oil 17. At a low temperature in such a season as winter, the bypass holes 29, 29 are opened, and the refrigerant gas flows directly to a discharge pipe 13a from the bypass holes 29, 29 without flowing to the heat radiator 21a. Accordingly, the compressor temperature can be kept adequate.
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