SCROLL COMPRESSOR

Abstract

A scroll compressor prevents the rotation of an orbiting scroll and reduces manufacturing cost. This scroll compressor has a housing, a fixed scroll having a first end plate and a first spiral wall body, an orbiting scroll having a second end plate and a second spiral wall body, rotation-preventing portions provided for at least one of the housing and the orbiting scroll, which allow the orbiting scroll to revolve while preventing the rotation thereof, a wall body shoulder portion formed along an upper edge of the second spiral wall body, and a step portion formed on the first end plate. In this scroll compressor, the shoulder portion and the step portion contact with and slide along each other, and a phase at which the shoulder portion is disposed to the center of the orbiting scroll is different from phases at which the rotation-preventing portions are disposed.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a cross-sectional view illustrating the structure of a scroll compressor according to a first embodiment of the present invention;

FIG. 2 is a perspective view illustrating the structure of a fixed scroll shown in FIG. 1;

FIG. 3 is a perspective view illustrating the structure of an orbiting scroll shown in FIG. 1;

FIG. 4 is a view illustrating the positions at which rotation-preventing portions shown in FIG. 1 are disposed;

FIG. 5 is a partially enlarged view illustrating the structure of the rotation-preventing portion shown in FIG. 1;

FIG. 6 is a view illustrating the motion of compression spaces in the scroll compressor shown in FIG. 1;

FIG. 7 is a view illustrating the motion of the compression spaces in the scroll compressor shown in FIG. 1;

FIG. 8 is a view illustrating the motion of the compression spaces in the scroll compressor shown in FIG. 1;

FIG. 9 is a view illustrating the motion of the compression spaces in the scroll compressor shown in FIG. 1;

FIG. 10 is a schematic view illustrating the rotation prevention of an orbiting scroll by a step portion, a shoulder portion, and rotation-preventing portions;

FIG. 11 is a schematic view illustrating the rotation prevention of the orbiting scroll by the step portion, the shoulder portion, and the rotation-preventing portions;

FIG. 12 is a schematic view illustrating the rotation prevention of the orbiting scroll by the step portion, the shoulder portion, and the rotation-preventing portions;

FIG. 13 is a schematic view illustrating the rotation prevention of the orbiting scroll by the step portion, the shoulder portion, and the rotation-preventing portions;

FIG. 14 is a view illustrating another example of a connection wall surface and a connection edge shown in FIGS. 2 and 3;

FIG. 15 is a view illustrating still another example of the connection wall surface and the connection edge shown in FIGS. 2 and 3;

FIG. 16 is a cross-sectional view illustrating another example of the rotation-preventing portion shown in FIG. 5;

FIG. 17 is a view illustrating the structure of the rotation-preventing portion shown in FIG. 16;

FIG. 18 is a cross-sectional view illustrating yet another example of the rotation-preventing portion shown in FIG. 5;

FIG. 19 is a view illustrating the structure of a fixed scroll of a scroll compressor according to a second embodiment of the present invention;

FIG. 20 is a view illustrating the structure of an orbiting scroll of the scroll compressor according to the second embodiment of the present invention;

FIG. 21 is a schematic view illustrating the rotation prevention of an orbiting scroll by a step portion, a shoulder portion, and rotation-preventing portions;

FIG. 22 is a schematic view illustrating the rotation prevention of the orbiting scroll by the step portion, the shoulder portion, and the rotation-preventing portions;

FIG. 23 is a schematic view illustrating the rotation prevention of the orbiting scroll by the step portion, the shoulder portion, and the rotation-preventing portions;

FIG. 24 is a schematic view illustrating the rotation prevention of the orbiting scroll by the step portion, the shoulder portion, and the rotation-preventing portions;

FIG. 25 is a view illustrating the structure of a fixed scroll of a scroll compressor according to a third embodiment of the present invention;

FIG. 26 is a view illustrating the structure of an orbiting scroll of the scroll compressor according to the third embodiment of the present invention;

FIG. 27 is a partially enlarged view illustrating the structure of a step portion of the fixed scroll shown in FIG. 25; and

FIG. 28 is a partially enlarged view illustrating the structure of a shoulder portion of the orbiting scroll shown in FIG. 26.

Claims

1. A scroll compressor comprising: a housing;a fixed scroll having a first end plate and a first spiral wall body vertically provided on one surface thereof;an orbiting scroll which has a second end plate and a second spiral wall body vertically provided on one surface thereof, and by engagement between the first body and the second wall body, which is allowed to revolve and is prevented from rotation;rotation-preventing portions which are provided for at least one of the housing and the orbiting scroll, and which allow the orbiting scroll to revolve and prevent the rotation thereof;at least one wall-body shoulder portion provided along an upper edge of the second spiral wall body, the height of the wall-body shoulder portion being small at a central side in the spiral direction and being great at an exterior end side thereof; andat least one end-plate step portion provided on said one surface of the first end plate at a position facing the wall-body shoulder portion, the height of the end-plate step portion being great at a central side in the spiral direction and being small at an exterior end side thereof;wherein a phase at which the wall-body shoulder portion is disposed with respect to the center of the orbiting scroll is different from phases at which the rotation-preventing portions are disposed.

2. The scroll compressor according to claim 1, wherein, among intervals between the phases at which the rotation-preventing portions are disposed with respect to the center of the orbiting scroll, at least one interval between phases is larger than intervals between the other phases, andthe wall-body shoulder portion or the end-plate step portion is disposed between rotation-preventing portions forming said at least one interval.

3. The scroll compressor according to claim 1, wherein the rotation-preventing portions and the wall-body shoulder portion or the end-plate step portion are disposed at approximately equivalent intervals with respect to the center of the orbiting scroll.

4. The scroll compressor according to claim 1, wherein a contact portion of the wall-body shoulder portion in contact with the end-plate step portion and a contact portion of the end-plate step portion in contact with the wall-body shoulder portion are provided with surface treatment layers for improving abrasion resistance.

5. The scroll compressor according to claim 1, wherein a contact portion of the wall-body shoulder portion in contact with the end-plate step portion is provided with a wall-body contact portion formed of an abrasion resistant member, anda contact portion of the end-plate step portion in contact with the wall-body shoulder portion is provided with an end-plate contact portion formed of an abrasion resistant member.

6. The scroll compressor according to claim 1, wherein said at least one wall-body shoulder portion and said at least one end-plate step portion are provided at a plurality of positions.

7. The scroll compressor according to claim 1, wherein the fixed scroll is disposed so that said one surface of the first end plate faces upward, andthe orbiting scroll is disposed so that said one surface of the second end plate faces downward.

8. The scroll compressor according to claim 1, wherein the fixed scroll and the orbiting scroll are disposed so that the first end plate and the second end plate intersect a horizontal surface, andthe wall-body shoulder portion and the end-plate step portion are disposed in the vicinities of lower ends of the second end plate and the first end plate, respectively.

9. The scroll compressor according to claim 1, wherein the rotation-preventing portions each have a housing-side support portion which is disposed at the housing and has a cylindrical surface, a scroll-side support portion which is disposed in the orbiting scroll and has a cylindrical surface, and a restricting portion which restricts a distance between a central axis of the housing-side support portion and that of the scroll-side support portion to have a predetermined length,the housing-side support portion is rotatably supported with respect to the housing or the restricting portion, andthe scroll-side support portion is rotatably supported with respect to the orbiting scroll or the restricting portion.