Patent Application
20110243776
The present disclosure relates to compressors including washers having anti-rotation features.
This section provides background information related to the present disclosure and which is not necessarily prior art.
Compressors may include a scroll member secured to a bearing housing by a fastener. A sleeve guide may extend through the scroll member, receiving the fastener and defining a guide for axial displacement of the scroll member during operation. However, rotation of the fastener during assembly may result in rotation of the sleeve guide and camming of the sleeve guide against the scroll member.
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
A compressor may include a shell, a housing fixed within the shell, a first scroll member disposed within the shell, a second scroll member disposed within the shell, a sleeve guide, a fastener, and a washer. The first scroll member may have a first spiral wrap extending from a first end plate and a radially outward extending scroll flange defining an opening. The second scroll member may have a second spiral wrap intermeshed with the first spiral wrap. The sleeve guide may be disposed within the opening defined by the scroll flange and may define an axial bore. The fastener may be disposed within the axial bore and engaged with the housing. The washer may be located between a head of the fastener and the scroll flange. A first portion of the washer may extend radially outward from the fastener head and may define a rotational stop inhibiting rotation of the washer through engagement with a rotationally fixed structure.
The first portion of the washer may define a first radial extent greater than a second radial extent defined by a second portion of the washer generally perpendicular to the first portion. The first radial extent may be at least twenty-five percent greater than the second radial extent. The washer may define an oblong shape in a radial direction relative to the fastener.
The washer may define a washer bore and the first portion of the washer may extend in a first radial direction from the washer bore. A second portion of the washer may extend in a second direction opposite the first radial direction. The first and second portions may each have a radial extent outward from the washer bore greater than a radial extent of a third portion generally perpendicular to the first radial direction. The radial extent of the first and second portions may be generally equal to one another.
The washer may abut an axial end of the sleeve guide. A first radial width of the washer may be greater than a second radial width of the washer. The first radial width may be greater than a radial distance between a shank of the fastener and the shell. The first radial width may be greater than a radial distance between a shank of the fastener and an outer surface of the first scroll member adjacent the washer. The first portion of the washer may define tapered sides opposite one another. The fastener may include a threaded portion and the washer may be retained axially between the threaded portion and the head by the threaded portion and the head.
In another arrangement, a compressor may include a shell, a housing fixed within the shell, a first scroll member disposed within the shell, a second scroll member disposed within the shell, a sleeve guide, a fastener, and a washer. The first scroll member may have a first spiral wrap extending from a first end plate in a radially outward extending scroll flange defining an opening. A second scroll member may have a second spiral wrap intermeshed with the first spiral wrap. The sleeve guide may be disposed within the opening defined by the scroll flange and may define an axial bore. The fastener may be disposed within the axial bore and may be engaged with the housing. The washer may be located between a head of the fastener and the scroll flange. The washer may define a first radial width greater than a second radial width of the washer.
The first radial width may be at least twenty-five percent greater than the second radial width. The radial extent of the washer may form a parallelogram. The parallelogram may include rounded corners.
The washer may include first and second sides opposite and generally parallel to one another and third and fourth sides extending between the first and second sides and generally parallel to one another. The first and third sides may define a first angle therebetween and the second and third sides may define a second angle therebetween greater than the first angle. The first angle may be less than ninety degrees and the second angle may be greater than ninety degrees. The second and fourth sides may define a third angle less than ninety degrees and the first and fourth sides may define a fourth angle greater than ninety degrees. The first radial width may be defined between a junction of the first and third sides and a junction of the second and fourth sides and the second radial width may be defined between a junction of the first and fourth sides and a junction of the second and third sides. The first and third angles may be approximately equal to one another and the second and fourth angles may be approximately equal to one another.
The first radial width of the washer may extend radially outward from an outer perimeter of the fastener head. The first radial width of the washer may define a rotational stop adapted to inhibit rotation of the washer. The washer may abut an axial end of the sleeve guide. The first radial width may be greater than a radial distance between a shank of the fastener and the shell. The first radial width may be greater than a radial distance between a shank of the fastener and an outer surface of the first scroll member adjacent the washer.
A method may include providing a compressor assembly including a first scroll member supported on a housing and having a first spiral wrap extending from a first end plate and a radially outward extending first scroll flange defining an opening. A first sleeve guide may be disposed within the opening and may define a first axial bore. A first fastener may be disposed within the axial bore and a first washer may be located between a head of the fastener and the scroll flange. The method may further include rotationally securing the washer and rotating the fastener to provide engagement between the fastener and the housing. The washer may be rotationally fixed during the rotating.
The washer may include a rotational stop and rotationally securing the washer may include engaging the rotational stop to prevent rotation of the washer with rotation of the fastener. Engaging the rotational stop may include rotationally securing a fixture relative to the compressor assembly and the rotational stop abutting the fixture. The washer may include a first portion defining a first radial extent greater than a second radial extent defined by a second portion of the washer generally perpendicular to the first portion.
Rotationally securing the washer may include the fixture abutting the first portion of the washer. The compressor assembly may include a fixture abutting a first portion of the washer. The compressor assembly may include a shell having the first scroll member and the housing located therein. Rotationally securing the washer may include locating the fixture radially between the washer and the shell. The fixture may include a locating member having first and second axially extending pins. The washer may include a third portion extending generally opposite the first portion and defining a third radial extent greater than a fourth radial extent defined by a fourth portion extending generally opposite the second portion. The first pin may be engaged with the first portion and the second pin may be engaged with the third portion to locate the fixture relative to the compressor assembly. The compressor assembly may include a second fastener extending through a second scroll flange of the first scroll member and a second washer located between a head of the second fastener and the second scroll flange. The fixture may include a third pin engaged with the second washer and preventing rotation of the second washer after the locating member locates the fixture relative to the compressor assembly.
The first washer may include first and second sides opposite and generally parallel to one another and third and fourth sides extending between the first and second sides and generally parallel to one another. The first and third sides may define a first angle therebetween and the second and third sides may define a second angle therebetween greater than the first angle. The method may further include orienting the fixture relative to the scroll assembly. The fixture may include a locating member having first and second axially extending pins. The orienting may include abutting the first side of the washer with the first pin and abutting the third side of the washer with the second pin. The orienting may include locating the fastener between the first and second pins. A junction between the first and third sides of the washer may be located radially outward from the first and second pins relative to the first scroll member.
The washer may define a first radial width greater than a second radial width of the washer generally perpendicular to the first radial width. Rotationally securing the washer may include the portion of the washer defining the first radial width abutting a structure rotationally fixed relative to the compressor assembly.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
Example embodiments will now be described more fully with reference to the accompanying drawings.
When an element or layer is referred to as being “on”, “engaged to”, “connected to” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to”, “directly connected to” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
The present teachings are suitable for incorporation in many different types of scroll and rotary compressors, including hermetic machines, open-drive machines and non-hermetic machines. For exemplary purposes, a compressor 10 is shown as a hermetic scroll refrigerant-compressor of the low-side type, i.e., where the motor and compressor are cooled by suction gas in the hermetic shell, as illustrated in the vertical section shown in
With reference to
Shell assembly 12 may form a compressor housing and may include a cylindrical shell 30, an end cap 32 at the upper end thereof, a transversely extending partition 34, and a base 36 at a lower end thereof. End cap 32 and partition 34 may define a discharge chamber 38. Discharge chamber 38 may form a discharge muffler for compressor 10. Refrigerant discharge fitting 22 may be attached to shell assembly 12 at opening 40 in end cap 32. Discharge valve assembly 24 may be located within discharge fitting 22 and may generally prevent a reverse flow condition. Suction gas inlet fitting 26 may be attached to shell assembly 12 at opening 42. Partition 34 may include a discharge passage 44 therethrough providing communication between compression mechanism 18 and discharge chamber 38.
First bearing housing assembly 14 may be affixed to shell 30 at a plurality of points in any desirable manner, such as staking. First bearing housing assembly 14 may include a main bearing housing 46, a first bearing 48 disposed therein, bushings (sleeve guides) 50, and fastener assemblies 52. Main bearing housing 46 may house first bearing 48 therein and may define an annular flat thrust bearing surface 54 on an axial end surface thereof. Main bearing housing 46 may include apertures 56 extending therethrough and receiving fastener assemblies 52.
Motor assembly 16 may generally include a motor stator 58, a rotor 60, and a drive shaft 62. Motor stator 58 may be press fit into shell 30. Drive shaft 62 may be rotatably driven by rotor 60 and may be rotatably supported within first and second bearing housing assemblies 14, 28. Rotor 60 may be press fit on drive shaft 62. Drive shaft 62 may include an eccentric crank pin 64 having a flat 66 thereon.
Compression mechanism 18 may generally include an orbiting scroll 68 and a non-orbiting scroll 70. Orbiting scroll 68 may include an end plate 72 having a spiral vane or wrap 74 on the upper surface thereof and an annular flat thrust surface 76 on the lower surface. Thrust surface 76 may interface with annular flat thrust bearing surface 54 on main bearing housing 46. A cylindrical hub 78 may project downwardly from thrust surface 76 and may have a drive bushing 80 rotatably disposed therein. Drive bushing 80 may include an inner bore in which crank pin 64 is drivingly disposed. Crank pin flat 66 may drivingly engage a flat surface in a portion of the inner bore of drive bushing 80 to provide a radially compliant driving arrangement. An Oldham coupling 82 may be engaged with the orbiting and non-orbiting scrolls 68, 70 to prevent relative rotation therebetween. Non-orbiting scroll 70 may include an end plate 84 having a spiral wrap 86 on a lower surface thereof, and a series of radially outward extending flange portions 88 defining openings 90.
Fastener assemblies 52 may each include a fastener 92 and a washer 94. Faster 92 may include a head 96 and a shank 98 having a threaded portion 99. Washer 94 may be located axially between fastener head 96 and flange portion 88 of non-orbiting scroll 70. More specifically, washer 94 may abut an axial end of bushing 50 and washer 94 may be captured between head 96 and threaded portion 99 of shank 98. For example, the washer 94 may be located on the shank 98 before threads are formed creating threaded portion 99. The larger diameter of the threaded portion 99 resulting from thread forming may capture the washer 94 on the shank 98.
Washer 94 may include first, second, third and fourth sides 100, 102, 104, 106 and may define first, second, third and fourth portions 108, 110, 112, 114. Washer 94 may additionally define a bore 116. First and second portions 108, 110 of washer 94 may extend radially outward from an outer perimeter of fastener head 96. First and second portions 108, 110 may have radial extents greater than radial extents of third and fourth portions 112, 114 relative to bore 116. First and second sides 100, 102 may be generally opposite and parallel to one another and third and fourth sides 104, 106 may be generally parallel to and opposite one another, forming a parallelogram.
First and third sides 100, 104 may extend at a first angle (θ1) relative to one another, second and third sides 102, 104 may extend at a second angle (θ2) relative to one another, second and fourth sides 102, 106 may extend at a third angle (θ3) relative to one another, and first and fourth sides 100, 106 may extend at a fourth angle (θ4) relative to one another. First and third angles (θ1, θ3) may each be less than second and fourth angles (θ2, θ4). More specifically, first and third angles (θ1, θ3) may each be less than ninety degrees and second and fourth angles (θ2, θ4) may each be greater than ninety degrees. As a result, first, second, third and fourth sides 100, 102, 104, 106 may define tapered sides of washer 94.
Rounded corners may be formed at a first junction 118 between first and third sides 100, 104, a second junction 120 between second and third sides 102, 104, a third junction 122 between second and fourth sides 102, 106, and fourth junction 124 between first and fourth sides 100, 106. A first radial extent (d1) may be defined between the first and third junctions 118 and a second radial extent (d2) may be defined generally perpendicular to the first radial extent between second and fourth junctions 120, 124. The first radial extent (d1) may be at least twenty-five percent greater than the second radial extent (d2), and more specifically at least fifty percent greater than the second radial extent (d2).
A radial distance between the shell 30 and the non-orbiting scroll 70 defined in a direction intersecting the fastener 92 may be less than the first radial extent (d1). The radial extent of the first and second portions 108, 110 may be generally equal to one another and the radial extent of the third and fourth portions 112, 114 may be generally equal to one another. The radial extents of the first and second portions 108, 110 may each be greater than the radial distance from fastener 92 to shell 30 and may also each be greater than the radial distance from fastener 92 to non-orbiting scroll 70.
Washer 94 may be rotationally fixed during assembly of compressor 10. Washer 94 may be located on shank 98 of fastener 92 axially between head 96 and flange portion 88. Bushing 50 may be located within opening 90 in flange portion 88 and shank 98 may be located within an axial bore defined by bushing 50. Washer 94 may be rotationally secured and fastener 92 may be rotated to provide threaded engagement between threaded shank 98 and main bearing housing 46. Rotationally securing washer 94 may generally inhibit displacement of bushing 50 during rotational driving of fastener 92. As shown in
Alternatively, as seen in the example illustrated in
During compressor assembly, fixture 210 may be rotationally secured relative to compressor 10, and more specifically relative to shell 30. Fixture 210 may be located radially between washers 94 and shell 30. First pin 220 may be engaged with first portion 108 of a first washer 94 and second pin 222 may be engaged with second portion 110 of the first washer 94. More specifically, first pin 220 may abut first side 100 of the first washer 94 and second pin 222 may abut fourth side 106 of the first washer 94. Third portion 112 may be located between first and second pins 220, 222 with fourth junction 124 being located radially outward from first and second pins 220, 222 relative to non-orbiting scroll 70. Therefore, fastener 92 may be located between first and second pins 220, 222 to provide orientation of fixture 210 relative to compressor 10.
Third pin 224 may be engaged with first portion 108 of a second washer 94 and fourth pin 226 may be engaged with first portion 108 of a third washer 94. More specifically, third pin 224 may abut first side 100 of the second washer 94 and fourth pin 226 may abut first side 100 of the third washer 94. Fixture 210 therefore secures washers 94 from rotation in a rotational direction of fasteners 92 during assembly. In the present example, washers 94 are fixed from rotation in a clockwise direction.
It is understood that the present disclosure additionally applies to non-symmetric washers. For example, as seen in
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the invention, and all such modifications are intended to be included within the scope of the invention.
This application claims the benefit of U.S. Provisional Application No. 61/319,550, filed on Mar. 31, 2010. The entire disclosure of the above application is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 61319550 | Mar 2010 | US |
