Scroll type compressor

Claim 2

A scroll type compressor with a hermetically sealed housing (10), the compressor comprising a fixed scroll (20) disposed within said housing (10), said fixed scroll (20) having a first end plate (21) and a first spiral element (22) extending therefrom, said first end plate (21) of said fixed scroll (20) dividing said housing (10) into a discharge chamber (50) and a suction chamber (60) into which said first spiral element (22) extends, an orbiting scroll (30) having a second end plate (31) from which a second spiral element (32) extends, said first and second spiral elements (22, 32) interfitting at an angular and radial offset to form a plurality of line contacts which define at least one pair of sealed off fluid pockets (70), a drive mechanism operatively connected to said orbiting scroll (30) to effect orbital motion of said orbiting scroll (30), a rotation preventing means (34) for preventing the rotation of said orbiting scroll (30) during orbital motion whereby the volume of said fluid pockets (70) changes to compress fluid in said pockets (70), said drive mechanism including a drive shaft (13) rotatably supported within an inner block member (11), said inner block member (11) being fixedly secured to said housing (10), characterized by a first plain bearing (14) disposed between an interior surface of said inner block member (11) and an exterior surface of said drive shaft (13), said drive shaft (13) having an axial bore (81) and at least one radial hole (84) extending through its exterior surface linked to said axial bore (81), and at least a first helical groove (131) formed on said exterior surface of said drive shaft (13) and linked to said radial hole (84).

Claim 3

The sealed scroll type compressor of claim 1, characterized in that said inner block member (11) comprises a first axial annular projection (111) extending therefrom, and that said first plain bearing (14) is disposed between an interior surface of said first axial annular projection (111) and an exterior surface of said drive shaft (13).

Claim 4

The sealed scroll type compressor of claim 1 or 2, characterized in that said axial bore (81) of said drive shaft (13) extends from an opening at one end of said drive shaft (13) to a closed end near an opposite end of said drive shaft (13).

Claim 5

The sealed scroll type compressor of one of claims 1 to 3, characterized by an integral pin member (16) disposed at said opposite end of said drive shaft (13), said pin member (16) being radially offset with respect to the axis of said drive shaft (13), said pin member (16) being operatively connected to said orbiting scroll (30) through a bushing (17) in which said pin member (16) is located, said bushing (17) being disposed within a second axial annular projection (33) extending from said second end plate (31) of said orbiting scroll (30), and a narrow passage formed from said closed end of said axial bore (81) to an end surface of said pin member (16) facing said second end plate (31).

Claim 6

The sealed scroll type compressor of one of claims 1 to 4, characterized by a second plain bearing (15) disposed between an interior surface of said second axial annular projection (33) and an exterior surface of said bushing (17), and a second helical groove (171) formed in said exterior surface of said bushing (17).

Claim 7

The sealed scroll type compressor of one of claims 1 to 5, characterized in that said housing (10) is provided with a refrigerant gas inlet port (85) extending therethrough and terminating near said opening of said axial bore (81).

Claim 8

The sealed scroll type compressor of one of claims 1 to 6, characterized in that said drive shaft (13) comprises at least one radial bore (82) extending therethrough linking said axial bore (81) near its closed end to said suction chamber (61).

Claim 9

The sealed scroll type compressor of one of claims 2 to 7, characterized in that said radial hole (84) is formed near the end of said first axial annular projection (111) and that said first helical groove (131) extends from said radial hole (84) along the entire length of drive shaft (13) supported in said inner block member (11).

Claim 10

The sealed scroll type compressor of one of claims 1 to 8, characterized in that said inner block member (11) divides said suction chamber (60) into a first suction chamber section (61) and a second suction chamber section (62) and that said rotation preventing means (34) is located in said second suction chamber section (62).

Claim 11

The sealed scroll type compressor of claim 9, characterized by at least one communicating hole (12) linking said first and second suction chamber sections (61, 62), said communicating hole (12) being formed through said inner block member (11).

Claim 12

The sealed scroll type compressor of claim 9, characterized by a first gap formed between said end surface of said pin member (16) and said orbiting scroll (30), and a second gap formed between said bushing (17) and said second plain bearing (15), said second gap linking said first gap with said second suction chamber section (62) and with said second helical groove (171) adjacent said second gap.

Claim 13

A scroll type compressor with a hermetically sealed housing (10) the compressor comprising a fixed scroll (20) disposed within said housing (10), said fixed scroll (20) having a first end plate (21) and a first spiral element (22) extending therefrom, said first end plate (21) of said fixed scroll (20) dividing said housing (10) into a discharge chamber (50) and a suction chamber (60) into which said first spiral element (22) extends, an orbiting scroll (30) having a second end plate (31) from which a second spiral element (32) extends, said first and second spiral elements (22, 32) interfitting at an angular and radial offset to form a plurality of line contacts which define at least one pair of sealed off fluid pockets (70), a drive mechanism operatively connected to said orbiting scroll (30) to effect orbital motion of said orbiting scroll (30), a rotation preventing means (34) for preventing the rotation of said orbiting scroll (30) during orbital motion whereby the volume of said fluid pockets (70) changes to compress fluid in said pockets (70), said drive mechanism including a drive shaft (13) rotatably supported within an inner block member (11), said inner block member (11) being fixedly secured to said housing (10), characterized by said drive shaft (13) having an axial bore (81) extending from an opening at one end of said drive shaft (13) to a closed end near an opposite end of said drive shaft (13), an integral pin member (16) disposed at said opposite end of said drive shaft (13), said pin member (16) being operatively connected to said orbiting scroll (30) through a bushing (17) in which said pin member (16) is located, said bushing (17) being disposed within an axial annular projection (33) extending from said second end plate (31) of said orbiting scroll (30), a narrow passage formed from said closed end of said axial bore (81) to an end surface of said pin member (16) facing said orbiting scroll (30), a first gap formed between said end surface of said pin member (16) and said orbiting scroll (30), a plain bearing (14) disposed between an interior surface of said axial annular projection (33) and an exterior surface of said bushing (17), a helical groove (171) formed in said exterior surface of said bushing (17) and linked to said suction chamber (62) and a second gap formed between said bushing (17) and said plain bearing (15) linking said first gap to said suction chamber (62).

Claim 14

A scroll type compressor with a hermetically sealed housing (10) the compressor comprising a fixed scroll (20) disposed within said housing (10), said fixed scroll (20) having a first end plate (21) and a first spiral element (22) extending therefrom, said first end plate (21) of said fixed scroll (20) dividing said housing (10) into a discharge chamber (50) and a suction chamber (60) into which said first spiral element (22) extends, an orbiting scroll (30) having a second end plate (31) from which a second spiral element (32) extends, said first and second spiral elements (22, 32) interfitting at an angular and radial offset to form a plurality of line contacts which define at least one pair of sealed off fluid pockets (70), a drive mechanism operatively connected to said orbiting scroll (30) to effect orbital motion of said orbiting scroll (30), a rotation preventing means (34) for preventing the rotation of said orbiting scroll (30) during orbital motion whereby the volume of said fluid pockets (70) changes to compress fluid in said pockets (70), said drive mechanism including a drive shaft (13) rotatably supported within an inner block member (11), said inner block member (11) being fixedly secured to said housing (10), characterized by said drive shaft (13) having an axial bore (81) extending from an opening at one end of said drive shaft (13) to a closed end near an opposite end of said drive shaft (13), an integral pin member (16) disposed at said opposite end of said drive shaft (13), said pin member (16) being operatively connected to said orbiting scroll (30) through a bushing (17) in which said pin member (16) is located, said bushing (17) being disposed within an axial annular projection (33) extending from said second end plate (31) of said orbiting scroll (30), a narrow passage formed from said closed end of said axial bore (81) to an end surface of said pin member (16) facing said orbiting scroll (30), a first gap formed between said end surface of said pin member (16) and said orbiting scroll (30), a plain bearing (14) disposed between an interior surface of said axial annular projection (33) and an exterior surface of said bushing (17), a helical groove (171) formed in said exterior surface of said bushing (17) and linked to said suction chamber (62) and a second gap formed between said bushing (17) and said plain bearing (15) linking said first gap to said suction chamber (62).

Claim 15

The sealed scroll type compressor of claim 12, characterized by said pin member (16) being radially offset with respect to the axis of said drive shaft (13).

Claim 16

The sealed scroll type compressor of claim 12 or 13, characterized in that said inner block member (11) divides said suction chamber (60) into a first suction chamber section (61) and a second suction chamber section (62), said second gap linking said first gap to said second suction chamber section (62).