| 摘要 |
PURPOSE:To facilitate machining, lower the level of the sound generated at the time of passage of a refrigerant and prevent noise at a specified frequency from being generated, by providing a refrigerant passage construction based on a simple shape of a body of revolution, and appropriately selecting the position of an equalizing port for connection between a refrigerant passage and a pressure space on the lower side of a diaphragm. CONSTITUTION:An outlet passage 250 is provided with a first region 252 adjacent to a valve port part 251, and a second region 254 in which an equalizing port 160 for connecting a pressure space on the lower side of a diaphragm and the outlet passage to each other is provided perpendicularly to the outlet passage 250. A sheet 260 provided in a substantially central part thereof with a circular hole having such a diameter as to provide a passage cross-sectional area greater than that of the valve port part 251 and smaller than that of the first region 252 is fixed in a boundary region between the first region 252 and the second region 254. A fluid has a high flow velocity upon coming out of the region 252 into the region 254. The equalizing passage 160 for connecting the space on the lower side of the diaphragm and the fluid passage to each other is provided in an upper wall part of the passage in the region 254, perpendicularly to the passage. Since the equalizing passage 160 is provided at a position where the flow velocity of a refrigerant is high, the pressure in the pressure space on the lower side of the diaphragm is lower as the flow velocity is higher. |
