Sanden Corporation

Yuji Yoshii

Masaharu Hiraga

Norio Kitano

Atsushi Mabe

Akihiro Kawano

Shinichi Otake

Takayuki Kudo

Yasuomi Matsumoto

Junichi Yabushita

Kiyoshi Teracuhi

Hideaki Satoh

A fixed scroll (16) and a movable scroll (18) cooperatively define compressing chambers therebetween. The movable scroll is driven by a crank pin (12) eccentrically attached to a shaft (11) which is rotated by an external driving source. A surface treatment for abrasion resistance is applied to at least one of an end surface of the crank pin and a confronting end plate of the movable scroll. It may also be arranged that an abrasion-resistant plate is interposed between the end surface of the crank pin and the confronting end plate of the movable scroll.

Scroll type compressor having an abrasion-resistant means between a

An improved electrical insulation structure is provided for a motor driven fluid apparatus having the compression and drive mechanisms within a hermetically sealed housing. The drive mechanism comprises a drive shaft operatively connected to the compression mechanism and a motor for rotating the drive shaft. The motor comprises a rotor fixedly surrounding the drive shaft and a stator assembly surrounding the rotor with a small radial air gap therebetween. The stator assembly comprises an annular magnetic core fixedly secured to the housing. The core has a plurality of axially extending slots and a plurality of windings, each having a plurality of coils formed by multiple turns of an enamel-coated conductor. The multiple turns of the conductor have side turn portions which are disposed within the axially extending slots and end turn portions which axially project from the slots and are generally disposed about the axial end surfaces of the core. The connection points between the windings themselves, and between the windings and conductor leads, are fixedly covered with a film of insulating material, such as epoxy resin. Alternatively, a portion of the surface of the housing is fixedly covered with a film of insulating material, such as aluminum oxide formed by anodization.

Hermetic motor driven fluid apparatus having improved insulating

A hermetic type scroll compressor includes a hermetically sealed compressor housing formed by first and second cup-shaped casings. A cylindrical housing portion is disposed between the first and second cup-shaped casings and has an annular inner block extending inwardly therefrom. The inner block divides the interior of the compressor into a first chamber in which the drive mechanism is housed and a second chamber in which the compression mechanism is housed. At one end, the drive shaft is supported by the inner block through bearings, and at the its other end, the drive shaft is supported by an annular projection extending from and integral with the second cup-shaped casing. Additionally, the stator is fixedly secured to the second cup-shaped casing. A gas passage, which allows the outer diameter of the compressor to be reduced, extends through the inner block to provide fluid communication between the first and second chambers.

Motor driven fluid compressor

The present invention discloses a reliable rotation preventing/thrust bearing device for use in an orbiting member fluid displacement apparatus. The rotation preventing/thrust bearing device includes a discrete fixed portion, a discrete orbital portion, and bearing elements. The fixed portion includes a first annular race and a first ring, both of which are formed separately. The first annular race is placed in a loose fit surrounding a first annular step in an inner surface of the housing and the first ring is attached to the housing. The orbital portion includes a second annular race and a second ring, both of which are formed separately. The second annular race is placed in a loose fit surrounding a second annular step in an end plate of the orbiting member and the second ring is attached to the end plate of the orbiting member. A plurality of pockets of the rings face one another in generally aligned pairs. A bearing element is received in each aligned pair of pockets to prevent the rotation of the orbiting member by the bearing elements interacting with the first and second rings and to carry the axial thrust load from the orbiting member. The first and second annular anti-wear plates are overlaid surrounding the first and second annular races, respectively. The first and second annular anti-wear plates are fixedly placed within the first and second annular steps respectively in order to prevent the circumferential and radial movement thereof.

Orbiting member fluid displacement apparatus with rotation preventing

A rotary machine, such as a horizontally oriented scroll type refrigerant compressor is disclosed. The compressor includes a compressor housing, an inner block fixedly disposed within the compressor housing, a drive shaft extending substantially in the horizontal direction, and a driven mechanism, such as a compression mechanism operatively connected to one end of the drive shaft. The drive shaft is rotatably supported by the inner block and the compressor housing. A shielding element, such as an annular cylindrical member is fixedly held between the inner block and the compressor housing to prevent the drive shaft from passing through an oil sump of the housing. An internal lubrication oil pump is formed by the elements which are associated with the drive shaft, and is operated by virtue of the rotational motion of the drive shaft in order to supply the lubrication oil from the oil sump to the frictional surfaces of the internal component parts of the compressor. According to the construction and operational manner of the oil pump, the oil pump can be used for various types of horizontally oriented rotary machines. The drive shaft can also rotate without receiving oil viscous drag.

Horizontally oriented rotary machine having internal lubication oil pump

A method for assembling a motor driven fluid compressor having a compression mechanism, such as a scroll type fluid compression mechanism and a drive mechanism which are contained within a hermetically sealed housing is disclosed. The compression mechanism includes a fixed and orbiting scrolls. The drive mechanism includes a drive shaft and a motor rotating the drive shaft. The housing is divided into a first and second cup-shaped portions and a cylindrical portion. An opening end of the first cup-shaped portion is releasably and hermetically connected to one opening end of the cylindrical portion. An opening end of the second cup-shaped portion is releasably and hermetically connected to another opening end of the cylindrical portion. A first, second and third sub-assemblies are separately prepared, and then are assembled into the compressor. The first sub-assembly is formed by the first cup-shaped portion and at least one internal component part of the compressor. The second sub-assembly is formed by the first cup-shaped portion and at least one internal component part of the compressor. The third sub-assembly is formed by the cylindrical portion and the remainder of the internal component parts of the compressor. Accordingly, the compressor can be easily assembled under a flexible management.

Scroll compressor formed of three sub-assemblies

The present invention is directed to a scroll type compressor having an injection mechanism in which a part of the refrigerant flowing from the condenser is combined with the refrigerant in the intermediately located fluid pockets of the scroll elements in order to increase the amount of heat radiation from the refrigerant in the condenser without increasing the capacity of the compressor and in order to prevent operation of the compressor at a thermally severe condition. The injection mechanism includes a horseshoe-shaped groove formed between a circular end plate of a fixed scroll and an end portion of a casing adjacent to the circular end plate, a pair of axial conduits formed through the end plate of the fixed scroll and an axial hole formed through the end portion of the casing. The refrigerant is conducted to the intermediately located fluid pockets of the scroll elements via the axial hole, the groove and the axial conduits which are connected in series for fluid communication. In accordance with the present invention, the injection mechanism is easily assembled, and the thermal influence of the high temperature discharged refrigerant gas in the discharge chamber of the injection mechanism is negligible so that the operation of the compressor at a thermally severe condition is effectively prevented.

Scroll type compressor with injection mechanism

A method for assembling a motor driven fluid compressor having a compression mechanism, such as a scroll type fluid compression mechanism and a drive mechanism which are contained within a hermetically sealed housing. The compression mechanism includes fixed and orbiting scrolls. The drive mechanism includes a drive shaft and a motor rotating the drive shaft. The housing is divided into first and second cup-shaped portions and a cylindrical portion. An opening end of the first cup-shaped portion is releasably and hermetically connected to one opening end of the cylindrical portion. An opening end of the second cup-shaped portion is releasably and hermetically connected to another opening end of the cylindrical portion. First, second and third sub-assemblies are separately prepared, and then are assembled into the compressor. The first sub-assembly is formed by the first cup-shaped portion and at least one internal component part of the compressor. The second sub-assembly is formed by the second cup-shaped portion and at least one internal component part of the compressor. The third sub-assembly is formed by the cylindrical portion and the remainder of the internal component parts of the compressor. Accordingly, the compressor can be easily assembled under a flexible management.

Method for assembling motor driven fluid compressor

A scroll type fluid displacement apparatus including a housing and a pair of scrolls having interfitting spiral wraps which undergo relative orbital motion to make moving line contacts and define sealed off moving fluid pockets of changing volume. The center portion of at least one of the wraps is higher than the remaining portion thereof. The center portion extends substantially from the inner end of the spiral wrap outwardly at least to the location of the line contact between the curved surfaces of the wraps when the innermost pair of fluid pockets are merged into a single fluid pocket to form the high pressure space near the center of the scrolls. This construction prevents abnormal wear of the spiral wrap and the opposite end plate which might otherwise occur during axial slant of the orbiting scroll, or which might be caused by non-parallelism of the scroll end plates, without compromising the important sealing of the central high pressure space.

Scroll type fluid displacement apparatus with nonuniform scroll height

A scroll type compressor including a housing, a fixed scroll which is joined to the housing and including a first end plate from which a first wrap extends and an orbiting scroll which includes a second end plate from which a second wrap extends. The wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. The first end plate is formed with a plurality of pairs of holes, the holes of each pair of holes being placed at symmetrical positions. The most inwardly placed hole is placed at a location defined by involute angles within the area defined by .phi.end-2(n-1).pi.&gt;.phi.1&gt;.phi.end-2n , where .phi.end is the final involute angle of the wrap which extends from the end plate having the holes, .phi.1 is the involute angle at which the hole is placed and n is the amount of pairs of holes. The most outwardly placed hole is placed at a location defined by involute angles within the area defined by .phi.n-1+2.pi.&gt;.phi.n&gt;.phi.end-2.pi.. The intermediate holes are located within an area defined by .phi.k-1+2.pi.&gt;.phi.k&gt;.phi.k+1-2.pi., where .phi.k is the involute angle at which hole kth from the most inwardly placed hole is located. A control mechanism controls the opening and closing of the holes to thereby control the capacity or displacement volume of the compressor.

Scroll type compressor with displacement adjusting mechanism

A scroll type fluid displacement apparatus including a housing with a fluid inlet port and fluid outlet port is disclosed. A fixed scroll is joined with the housing and has a first circular end plate from which a first wrap extends. An orbiting scroll has a second circular end plate from which a second wrap extends. The first and second wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. A driving mechanism, which includes a drive shaft, is operatively connected to the orbiting scroll to effect the orbital motion of the orbiting scroll at radius Ror, while the rotation of the orbiting scroll is prevented by a rotation preventing/thrust bearing device, whereby the fluid in the fluid pockets moves inwardly or outwardly and changes in volume. The center of the first circular end plate is aligned with the center line of the housing and the center of the first wrap is radially offset from the center of the first circular end plate by the distance 1/2 Ror. The center of the second wrap is radially offset from the center of the second circular end plate by the distance 1/2 Ror. The drive shaft has a center line, which is aligned with the center line of the housing, and also has a crank pin, the center line of which is aligned with the center of the second circular end plate.

Scroll type fluid displacement apparatus with offset wraps for reduced

A scroll type compressor is disclosed. The compressor includes a housing. A fixed scroll is joined to the housing and includes a first end plate from which a first wrap extends. An orbiting scroll also includes second end plate from which a second wrap extends. The wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. The first end plate is formed with at least two holes which are placed at the symmetrical positions. A first of the holes is placed at a location, defined by involute angles, within the area defined by .phi. end &gt;.phi.1&gt;.phi. end-2.pi., where .phi.0 end is the final involute angle of the wrap which extends from the end plate having the holes, and .phi. 1 is the involute angle at which the first hole is placed. The second hole is located at an involute angle approximately .phi.1-.pi.. A control mechanism controls the opening and closing of the holes to thereby control the capacity of compressor.

Growing community of inventors

Takasaki, Japan

Yuji Yoshii