| 摘要 |
<p>A number of scroll compressor designs protect the back chamber seals (34, 36, 68, 70, 94, 96, 123, 124, 140, 142) upon reverse rotation. In the prior art, scroll compressors are sometimes miswired and inadvertent reverse rotation results. In some applications, this has caused the seals to be crushed. The present invention ensures that upon reverse rotation, the pressure within the back chamber (29, 56, 86, 122, 134) is maintained at suction pressure rather than the very low pressure which may be found in the compression chambers. The seals are protected. In one embodiment a relief (38) is formed at a seal groove to ensure suction pressure does communicate into the back chamber. In other embodiments, a valve (60, 88, 118, 138) controls the pressure in the back chamber. Upon normal operation, the valve allows pressure from the back pressure tap (54, 84, 114, 132) to communicate into the back chamber. During reverse rotation, the valve allows suction pressure to communicate to the back chamber.</p> |
