| 摘要 |
<p>PURPOSE:To reduce manufacturing cost of the captioned compressor, by making it possible to switch a low pressure introducing hole connected to a low pressure chamber, a high pressure introducing hole connected to a high pressure chamber, and a signal pressure outputting hole connected to a crank case, by means of a single plunger provided with an electromagnetic coil. CONSTITUTION:An electromagnetic valve 400 to which a low pressure introducing hole 410 connected to a low pressure chamber 305, a high pressure introducing hole 412 connected to a high pressure chamber 304, and a signal outputting hole 411 connected to a crank case 200 are connected is provided with a plunger 420 that is used to open or close each hole 410, 411 or 412. This plunger 420 is provided with a guide groove 425 in addition to a connecting hole 424, which connects the low pressure introducing hole 410 and the signal pressure outputting hole 411 when the plunger 420 is situated at one side but it connects the high pressure introducing hole 412 and the signal outputting hole 411 when the plunger 420 is situated at the other side, so that the plunger 420 can be moved by electromagnetic force of an electromagnetic coil 422. Thus, duty-ratio control over the electromagnetic coil 422 permits a single electromagnetic coil 422 to vary the pressure in the crank case 200.</p> |
