Abstract: An air conditioner generally comprises a compressor accommodated in the outer casing thereof and the compressor is surrounded by a sound-proof cover. The sound-proof cover is formed of a main body made of a sound absorbing material and a heat insulating member preferably made of a foam of a thermosetting resin which is bonded to the surface of the main body opposing to the outer surface of the compressor. The heat insulating member has a heat transfer efficiency smaller than that of the main body. The main body is preferably formed of a sound absorbing member and a noise insulating member. The heat insulating member, the sound absorbing member and the noise insulating member are laminated and bonded to each other in this order. The entire sound-proof cover is arranged in contact with substantially the entire outer periphery of the compressor. An outer casing formed of a sound absorbing material may be further disposed so as to surround the sound-proof cover with space therebetween.

Abstract: A bearing having a valve seat for a rotary compressor which is made of austenitic cast iron with graphite crystallized in an austenite matrix in the form of an A type, C type or A/C combined type under the ISO classification, maximum length crystallized graphite being in a range of 0.45 to 1.4 mm.

Abstract: A compressor comprises a casing having an aperture, a compressor unit provided in the casing, and an electric motor for driving the compressor unit, the electric motor being provided in the casing together with the compressor unit. An iron joint is mounted to the aperture of the casing and is formed with an electrically conductive metal coating having a corrosion resistance greater than that of iron on the surface thereof. The iron joint is comprised of a cylindrical portion and a conical outer surface portion welded to the edge of the aperture by resistance welding. A pipe for sucking or discharging gas to or from the casing is brazed into the cylindrical portion of the iron joint with a copper brazing material.