A scroll type compressor including a fixed scroll (23) having a suction opening (32), a movable scroll (25), a hermetically sealed container (3) having an upper cap (7) in which the fixed scroll and the movable scroll are mounted, and a suction pipe (31) that penetrates through the upper cap (7) and is engagedly fitted through an O ring (85) in the suction opening of the fixed scroll at a lower portion thereof. The upper cap (7) is provided with a pipe stand (81) formed of iron at a suction-pipe penetrating portion thereof, and the suction pipe (31) comprises an iron lower suction member (31A) that is engagedly fitted in the suction opening (83) of the fixed scroll (23) and an O-ring groove (8) in which the O ring (85) is fitted, and a copper upper suction member (31B) that is joined to the lower suction member (31A) by brazing and engagedly fitted in the pipe stand (81), the upper suction member (31B) and the pipe stand (81) being joined to each other by brazing.

A compressor includes first and second scroll members (76; 78), first and second bearing housings (14;16), and a motor assembly (20). The first scroll member (76) includes a first end plate (80) and a first spiral wrap (82) extending from the first end plate (80). The second scroll member (78) includes a second end plate (86) and a second spiral wrap (88) extending from the second end plate (86) and intermeshed with the first spiral wrap (82) to define compression pockets (122) therebetween. The first bearing housing (14) supports the first scroll member (76) for rotation about a first rotational axis (A1). The second bearing housing (16) supports the second scroll member (78) for rotation about a second rotational axis (A2) that is parallel to and offset from the first rotational axis (A1). The motor assembly (20) is disposed axially between the first and second bearing housings (14;16) and includes a rotor (100) attached to the first scroll member (76). The rotor (100) surrounds the first and second end plates (80;86).

A scroll type compressor including a fixed scroll (23) having a suction opening (32), a movable scroll (25), a hermetically sealed container (3) having an upper cap (7) in which the fixed scroll and the movable scroll are mounted, and a suction pipe (31) that penetrates through the upper cap (7) and is engagedly fitted through an O ring (85) in the suction opening of the fixed scroll at a lower portion thereof. The upper cap (7) is provided with a pipe stand (81) formed of iron at a suction-pipe penetrating portion thereof, and the suction pipe (31) comprises an iron lower suction member (31A) that is engagedly fitted in the suction opening (83) of the fixed scroll (23) and an O-ring groove (8) in which the O ring (85) is fitted, and a copper upper suction member (31B) that is joined to the lower suction member (31A) by brazing and engagedly fitted in the pipe stand (81), the upper suction member (31B) and the pipe stand (81) being joined to each other by brazing.

A motor-driven compressor has a compression mechanism, a rotary shaft, an electric motor, a motor drive circuit, a connecting terminal and a housing assembly. The compression mechanism, the electric motor, and the motor drive circuit are disposed along the axial direction of the rotary shaft in the housing assembly having first through third housings. The first housing is used for mounting the electric motor and the compression mechanism. The second housing has a terminal mounting portion for fixing the connecting terminal. The first and second housings have fastening portions at the radially peripheral portion thereof. The third housing is joined to the second housing to form an accommodation space for accommodating the motor drive circuit. The closed casing is formed by fastening the fastening portions of the first and second housings by means of a first bolt and connecting the second housing to the open end of the first housing.

In a scroll fluid machine, a stationary scroll (1) fixed to a housing engages with an orbiting scroll (7) to form a sealed chamber between the orbiting and stationary scrolls. Fluid in the sealed chamber is compressed or decompressed with revolution of the orbiting scroll (7) with respect to the stationary scroll (1). A plurality of self-rotation preventing devices (30) are provided on the orbiting scroll (7) to prevent the orbiting scroll from rotating on its own axis. The self-rotation preventing device (30) comprises an eccentric tube (31) connected to a main shaft (32) fitting in the housing, and an eccentric shaft (34) fitted in a bearing plate. The eccentric tube (31) is eccentrically revolved with respect to the main shaft thereby allowing engagement of the orbiting scroll (7) with the stationary scroll (1) to be adjusted.

In a single-screw compressor, a gate rotor (50) and a gate rotor supporting member (55) together form a gate rotor assembly (60). In the gate rotor assembly (60), each gate (51) is supported by a gate supporting portion (57) from the back surface side thereof. Each gate (51) includes a pressure introduction channel (52) running through the gate (51) in the thickness direction thereof. A back pressure space (65) is formed on the back surface side of each gate (51). The back pressure space (65) communicates with a space on the front surface side of the gate (51) via the pressure introduction channel (52). Therefore, the internal pressure of the back pressure space (65) is generally equal to the refrigerant pressure acting upon the front surface of the gate (51). This as a result reduces the deformation of the gate (51).

A suction passage (40) of a cylinder (23) is connected to a suction pipe (42). Discharge passages (56, 57) of the cylinder (23) are open to the inner space of a sealed housing (10). Discharge gas is led to the outside through a discharge pipe (14). A suction pressure chamber (50) closed by an O-ring (47) is formed between part of the outside surface of the cylinder (23) opposite to the suction passage (40) and the head surface of a second block member (46) fixed to the sealed housing (10). The cylinder (23) is formed with a communicating passage (51) extending from the suction passage (40) to the suction pressure chamber (50) to lead suction gas in the suction passage (40) into the suction pressure chamber (50) and thereby allow the pressure of suction gas in the suction passage (40) to act on the outside surface of the cylinder (23).

Leakage in a scroll wrap compressor is reduced by providing a roughened scroll wrap tip surface at the gap between the tip and the cooperating base so as to increase the frictional resistance to flow of fluid through the gap and to cause turbulence within the gap to further increase the resistance to the flow of fluid from the high pressure to the low pressure side across a scroll wrap tip. Various types of surfaces are shown for increasing the frictional resistance to flow such as knurling (16), grooving, cast cavities, metal particles and fibers and the like.