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Scroll compressor with complex fillets between eccentric pin and shaft shoulder

a compressor and eccentric pin technology, applied in the field of scroll compressors, can solve the problems of increasing the size of the scroll compressor, increasing the likelihood of eccentric pin fatigue, and not being able to be as large as the fillets,

Inactive Publication Date: 2006-06-15
SCROLL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention provides a design for a fillet between an eccentric pin and a shaft shoulder that is more complex than a single radius. This design uses a pair of radii at both the flat surface and the curved portion, with a larger radius merging into the outer diameter of the eccentric pin and a smaller radius connecting from the larger radius and merging into the shaft shoulder. This design ensures that the eccentric pin and the shaft do not need to be formed to have a greater diameter. In another embodiment, the complex surface is formed by an ellipse, where varying radii are provided along the fillet. This design provides improved performance and efficiency of the shaft and eccentric pin assembly."

Problems solved by technology

Due to size issues, the fillets have not been able to be as large as may be desirable.
As the forces encountered by the eccentric pin in causing the one scroll member increase, such as may be the case with increasing capacity for the scroll compressor, there is a greater likelihood of fatigue of the eccentric pin.
While these issues could be addressed by increasing the size of the eccentric pin, or simply increasing the radius of the fillet, such changes would require an increase in the size of the scroll compressor.
A size increase would be undesirable.

Method used

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  • Scroll compressor with complex fillets between eccentric pin and shaft shoulder
  • Scroll compressor with complex fillets between eccentric pin and shaft shoulder
  • Scroll compressor with complex fillets between eccentric pin and shaft shoulder

Examples

Experimental program
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first embodiment

[0019]FIG. 4A shows a first embodiment eccentric pin 60, wherein the flat portion 62 has a fillet formed of a compound surface with a first relatively large radius portion 68 extending to an outer surface of the eccentric pin 60, and a second relatively small radius portion 70 extending to a shoulder 71 of the shaft. A merge point 69 blends the two portions.

[0020] The curved portion 64 has similar portions 72 and 74 extending to the shoulder 71. A merge point 75 blends the two portions.

[0021] In preferred embodiments, the radius for portion 68 may be and the radius for portion 70 may be ______, with the radius for portion 72 being ______ and the radius for portion 74 being ______. Of course, other radii may be utilized within the scope of this invention.

embodiment 80

[0022]FIG. 5 shows another embodiment 80 wherein the fillets are formed to generally have the shape of an ellipse, such that there is a relatively large radius portion 82 at one end and a decreasing radius portion 86 extending to a relatively smaller radius portion 87 extending to the shoulder 84, and similar portions 90, 91 and 92 on the curved portion.

[0023] The present invention thus provides an eccentric pin extending from a shaft in a scroll compressor that is less likely to suffer from fatigue, but which does not require any dimensional changes in the sizes of the shaft, eccentric pin, slider block, or the orbiting scroll.

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Abstract

A scroll compressor has an eccentric pin that extends forwardly of a rotating shaft. The eccentric pin generally has a curved outer portion and a flat outer portion. Each of the flat and curved outer portions have fillets that are formed to merge the eccentric pin portions into an end surface or shoulder on the shaft. The fillets are formed to have a relatively complex shape with more than a single radius of curvature. In one embodiment, there are two radii of curvature, with a greater radius of curvature formed to extend from an outer periphery of the eccentric pin, and merge into a second portion having the lesser radius of curvature that merges from the first portion downwardly into the shoulder. In a second embodiment, the fillet generally has the shape of one quarter of an ellipse.

Description

BACKGROUND OF THE INVENTION [0001] This application relates to a scroll compressor wherein an eccentric pin extending forwardly of a rotating shaft shoulder is formed to have fillets at its roots that have a complex shape, to reduce the likelihood of fatigue. [0002] Scroll compressors are becoming widely utilized in refrigerant compression applications. In a scroll compressor, a pair of scroll members each have a base with a generally spiral wrap extending from the bases. One of the two scroll members is caused to orbit relative to the other. [0003] In one major style of scroll compressors, the one scroll member is caused to orbit by a rotating shaft being driven by an electric motor. The rotating shaft has a pin formed to extend eccentrically from an end of the shaft, and into a boss in the one scroll member. A slider block is positioned between the eccentric pin and the boss. Rotation of the shaft causes an orbiting movement of the one scroll member through the interaction of the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01C1/02F04C2/00F01C1/063
CPCF04C18/0215Y10T74/211F04C29/0057F04C23/008
Inventor SUN, ZILI
Owner SCROLL TECH