Scroll compressor
First Claim
1. A scroll compressor comprising:
- a casing;
a drive shaft rotatably supported on the casing;
a fixed scroll member arranged in and fixed to the casing;
a movable scroll member movably arranged in the casing;
said scroll members having scroll portions which are arranged in a side-by-side relationship in a radial direction so that radially spaced chambers are created;
a crank member which is connected to the drive shaft at a location spaced from an axis of the drive shaft;
the movable scroll member being connected rotatably to the crank member, so as to obtain an orbital movement of the movable scroll member about an axis of the drive shaft, so that said radially spaced chambers move radially inwardly, while volumes of the chambers are reduced;
inlet means for introducing a medium to be compressed into a radially outwardmost one of the chambers;
outlet means for discharging the medium as compressed from a radially innermost one of the chambers;
a plurality of circumferentially spaced first pins mounted on the movable scroll member, so that the first pins extend axially away from the scroll portion; and
a plurality of circumferentially spaced second pins mounted on the casing, so that the second pins extend axially toward the movable scroll member;
dimensions of the first and second pins with respect to the radius of the orbital movement of the movable scroll member being such that the first and second pins are capable of being in side by side contact with each other, while the first pins are rotated about the respective second pins during the orbital movement of the movable scroll member, each of the first pins being unrestricted in movement in a direction radially away from an associated one of the second pins;
an arrangement of the first and second pins on the movable scroll member and the casing, respectively, is such that there exists, at every angular position of the movable scroll member, at least one pair of the first and second pins, which generates a force in a direction opposite to a direction of self-rotation of the movable scroll member, thereby preventing the movable scroll member from rotating about its own axis.
1 Assignment
0 Petitions
Accused Products
Abstract
A self-rotation blocking mechanism in a scroll compressor having a movable scroll member and fixed scroll member fixed to a casing. The mechanism is constructed of circumferentially spaced opposing pairs of pins 9 and 10, which are connected to an end plate 12 of the movable scroll member 2 and a faced end wall of the casing 4, respectively, and which are in a side-by-side contacting relationship. The circumferential arrangement of the pins is such that, at every angular position of the movable scroll member, there exists at least one pair of the pins which generates a force in a direction opposite to a self-rotating torque applied to the movable scroll member caused by the compression reaction force. A locally concentrated arrangement of the pairs of the pins for generating such a force can be employed at the angular position which produces a larger value of self-rotating torque. Furthermore, the diameters of the pins are such that one half of the sum of the diameters is equal to or smaller than the radius of the orbital movement of the movable scroll member.
30 Citations
19 Claims
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1. A scroll compressor comprising:
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a casing; a drive shaft rotatably supported on the casing; a fixed scroll member arranged in and fixed to the casing; a movable scroll member movably arranged in the casing; said scroll members having scroll portions which are arranged in a side-by-side relationship in a radial direction so that radially spaced chambers are created; a crank member which is connected to the drive shaft at a location spaced from an axis of the drive shaft; the movable scroll member being connected rotatably to the crank member, so as to obtain an orbital movement of the movable scroll member about an axis of the drive shaft, so that said radially spaced chambers move radially inwardly, while volumes of the chambers are reduced; inlet means for introducing a medium to be compressed into a radially outwardmost one of the chambers; outlet means for discharging the medium as compressed from a radially innermost one of the chambers; a plurality of circumferentially spaced first pins mounted on the movable scroll member, so that the first pins extend axially away from the scroll portion; and a plurality of circumferentially spaced second pins mounted on the casing, so that the second pins extend axially toward the movable scroll member; dimensions of the first and second pins with respect to the radius of the orbital movement of the movable scroll member being such that the first and second pins are capable of being in side by side contact with each other, while the first pins are rotated about the respective second pins during the orbital movement of the movable scroll member, each of the first pins being unrestricted in movement in a direction radially away from an associated one of the second pins; an arrangement of the first and second pins on the movable scroll member and the casing, respectively, is such that there exists, at every angular position of the movable scroll member, at least one pair of the first and second pins, which generates a force in a direction opposite to a direction of self-rotation of the movable scroll member, thereby preventing the movable scroll member from rotating about its own axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A scroll compressor comprising:
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a casing; a drive shaft rotatably supported on the casing; a fixed scroll member arranged in and fixed to the casing; a movable scroll member movably arranged in the casing; said scroll members having scroll portions which are arranged in a side-by-side relationship in a radial direction so that radially spaced chambers are created; a drive key fixedly connected to the drive shaft at a location spaced from an axis of the drive shaft; a bushing on which the movable scroll member is rotatably mounted, the bushing defining a groove which receives said drive key, so as to obtain an orbital movement of the bushing about an axis of the drive shaft, so that said radially spaced chambers move radially inwardly, while volumes of the chambers are reduced; the drive key having a rotating force transmission radial plane extending parallel to the axis of the drive shaft, while the groove defines a rotating force receiving radial plane extending parallel to the axis of the drive shaft, these planes contacting with each other while allowing the drive key to be radially slidable in the groove, the planes being, in a cross section transverse to the axis of the shaft, inclined with respect to the line connecting the axis of the movable scroll member and the axis of the drive shaft opposite to the direction of the rotation of the drive shaft; inlet means for introducing a medium to be compressed into a radially outwardmost one of the chambers; outlet means for discharging the medium as compressed from a radially innermost one of the chambers; a plurality of circumferentially spaced first pins mounted onto the movable scroll member, so that the first pins extend axially away from the scroll portion, and; a plurality of circumferentially spaced second pins mounted onto the casing, so that the second pins extend axially toward the movable scroll member; the dimensions of the first and second pins with respect to the radius of the orbital movement of the movable scroll member being such that the first and second pins can be in side-by-side contact with each other while the first pins are rotated about the respective second pins during the orbital movement of the movable scroll member; the arrangement of the first and second pins on the movable scroll member and the casing, respectively, is such that there exist, at every angular position of the movable scroll member, at least one pair of the first and second pins which generates a force in a direction opposite to the direction of the self-rotation of the movable scroll member, thereby preventing the movable scroll member from being rotated about its own axis.
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Specification