US20170022989A1 - Unfastened thrust plate - Google Patents
Unfastened thrust plate Download PDFInfo
- Publication number
- US20170022989A1 US20170022989A1 US14/805,097 US201514805097A US2017022989A1 US 20170022989 A1 US20170022989 A1 US 20170022989A1 US 201514805097 A US201514805097 A US 201514805097A US 2017022989 A1 US2017022989 A1 US 2017022989A1
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- United States
- Prior art keywords
- scroll
- thrust plate
- unfastened
- scroll compressor
- bearing member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C17/00—Arrangements for drive of co-operating members, e.g. for rotary piston and casing
- F01C17/06—Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints or similar elements
- F01C17/066—Arrangements for drive of co-operating members, e.g. for rotary piston and casing using cranks, universal joints or similar elements with an intermediate piece sliding along perpendicular axes, e.g. Oldham coupling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/005—Axial sealings for working fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
- F04C18/0223—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving with symmetrical double wraps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/50—Bearings
Definitions
- This invention generally relates to scroll compressors for compressing refrigerant.
- a scroll compressor is a certain type of compressor that is used to compress refrigerant for such applications as refrigeration, air conditioning, industrial cooling and freezer applications, and/or other applications where compressed fluid may be used.
- Such prior scroll compressors are known, for example, as exemplified in U.S. Pat. No. 6,398,530 to Hasemann; U.S. Pat. No. 6,814,551, to Kammhoff et al.; U.S. Pat. No. 6,960,070 to Kammhoff et al.; U.S. Pat. No. 7,112,046 to Kammhoff et al.; and U.S. Pat. No.
- scroll compressors conventionally include an outer housing having a scroll compressor contained therein.
- a scroll compressor includes first and second scroll compressor members.
- a first compressor member is typically arranged stationary and fixed in the outer housing.
- a second scroll compressor member is moveable relative to the first scroll compressor member in order to compress refrigerant between respective scroll ribs which rise above the respective bases and engage in one another.
- the moveable scroll compressor member is driven about an orbital path about a central axis for the purpose of compressing refrigerant.
- An appropriate drive unit typically an electric motor, is usually provided within the same housing to drive the movable scroll member.
- Embodiments of the present invention represent an advancement of the state of the art for scroll compressors.
- a scroll compressor with unfastened thrust plate includes a compressor housing and scroll compressor bodies disposed in the compressor housing.
- the scroll bodies include a fixed scroll body and a moveable scroll body.
- the fixed and moveable scroll bodies have respective bases and respective scroll ribs that project from the respective bases.
- the scroll ribs mutually engage.
- the moveable scroll body is movable relative to the fixed scroll body for compressing fluid.
- An upper bearing member provides axial thrust support to the moveable scroll compressor body through a bearing support via an unfastened thrust plate that is located between the upper bearing member and the moveable scroll body.
- the unfastened thrust plate has no means of attachment to the upper bearing member or to the moveable scroll body.
- the unfastened thrust plate is rotationally unconstrained.
- the unfastened thrust plate is constrained radially by an upper bearing member.
- the unfastened thrust plate may be concentrically located within a cylindrical portion of the upper bearing member.
- the unfastened thrust plate may be constrained axially by the upper bearing member and the moveable scroll body.
- the unfastened thrust plate has a central opening to accommodate a drive shaft of the compressor.
- the unfastened thrust plate may include a central hub that defines the central opening.
- the unfastened thrust plate has a plate-like perimeter region, and wherein the central hub is raised above the plate-like region.
- the unfastened thrust plate nests within a cylindrical recess in a top of the upper bearing member.
- a radial clearance between the unfastened thrust plate and the upper bearing member ranges from RC 3 to RC 8 based on the ANSI B4.1 tolerance fit limits, but more preferably ranges from RC 3 to RC 5.
- the radial clearance may be defined as the average distance between an outer diameter of the unfastened thrust plate and an inner diameter of the upper bearing member.
- FIG. 1 is a cross-sectional isometric view of a scroll compressor assembly, according to an embodiment of the invention
- FIG. 2 is a cross-sectional isometric view of an upper portion of the scroll compressor assembly of FIG. 1 ;
- FIG. 3 is a cross-sectional isometric view of a top portion of the scroll compressor assembly of FIG. 1 ;
- FIG. 4 is a cross-sectional isometric view of a lower portion of the scroll compressor assembly of FIG. 1 ;
- FIG. 5 is a perspective view of an exemplary key coupling and movable scroll compressor body, according to an embodiment of the invention.
- FIGS. 1-4 An embodiment of the present invention is illustrated in FIGS. 1-4 as a scroll compressor assembly 10 generally including an outer housing 12 in which a scroll compressor 14 can be driven by a drive unit 16 .
- the scroll compressor assembly 10 may be arranged in a refrigerant circuit for refrigeration, industrial cooling, freezing, air conditioning or other appropriate applications where compressed fluid is desired.
- Appropriate connection ports provide for connection to a refrigeration circuit and include a refrigerant inlet port 18 and a refrigerant outlet port 20 extending through the outer housing 12 .
- the scroll compressor assembly 10 is operable through operation of the drive unit 16 to operate the scroll compressor 14 and thereby compress an appropriate refrigerant or other fluid that enters the refrigerant inlet port 18 and exits the refrigerant outlet port 20 in a compressed high-pressure state.
- the outer housing 12 for the scroll compressor assembly 10 may take many forms.
- the outer housing 12 includes multiple shell sections.
- the outer housing 12 includes a central cylindrical housing section 24 , and a top end housing section 26 , and a bottom end housing section 28 .
- the housing sections 24 , 26 , 28 are formed of appropriate sheet steel and welded together to make a permanent outer housing 12 enclosure.
- other housing assembly provisions can be made that can include metal castings or machined components, wherein the housing sections 24 , 26 , 28 are attached using fasteners.
- the central housing section 24 is cylindrical, joined with the top end housing section 26 .
- a separator in the form of separator plate 30 is disposed in the top end housing section 26 .
- Each of the top and bottom end housing sections 26 , 28 are generally dome shaped and include respective cylindrical side wall regions 32 , 34 that assemble to the center section 24 and provide for closing off the top and bottom ends of the outer housing 12 .
- the top side wall region 32 telescopically overlaps the central housing section 24 and is exteriorly welded along a circular welded region to the top end of the central housing section 24 .
- a bottom portion of the central cylindrical housing section 24 overlaps the side wall region 34 .
- these components may be assembled such that when the top end housing section 26 is joined to the central cylindrical housing section 24 , a single weld around the circumference of the outer housing 12 joins the top end housing section 26 , the separator plate 30 , and the central cylindrical housing section 24 .
- the central cylindrical housing section 24 is welded to the bottom shell 28 , though, as stated above, alternate embodiments would include other methods of joining (e.g., fasteners) these sections of the outer housing 12 .
- separator plate 30 could be a stamped steel component, it could also be constructed as a cast and/or machined member (and may be made from steel or aluminum) to provide the ability and structural features necessary to operate in proximity to the high-pressure refrigerant gases output by the scroll compressor 14 . By casting or machining the separator plate 30 in this manner, heavy stamping of such components can be avoided.
- the top end housing section 26 is generally dome-shaped and includes a respective cylindrical side wall region 32 that abuts the top of the central cylindrical housing section 24 , and provides for closing off the top end of the outer housing 12 .
- the drive unit 16 in is the form of an electrical motor assembly 40 .
- the electrical motor assembly 40 operably rotates and drives a shaft 46 .
- the electrical motor assembly 40 generally includes an outer annular motor housing 48 , a stator 50 comprising electrical coils and a rotor 52 that is coupled to the drive shaft 46 for rotation together.
- the rotor 52 is mounted on the drive shaft 46 , which is supported by upper and lower bearing members 42 , 44 . Energizing the stator 50 is operative to rotatably drive the rotor 52 and thereby rotate the drive shaft 46 about a central axis 54 .
- axial and radial are used herein to describe features of components or assemblies, they are defined with respect to the central axis 54 .
- axial or “axially-extending” refers to a feature that projects or extends in a direction generally parallel to the central axis 54
- radial or “radially-extending” indicates a feature that projects or extends in a direction generally perpendicular to the central axis 54 .
- the lower bearing member 44 includes a central generally cylindrical hub 58 that includes a central bushing and opening to provide a cylindrical bearing 60 to which the drive shaft 46 is journaled for rotational support.
- a plurality of arms 62 and typically at least three arms project radially outward from the bearing central hub 58 preferably at equally spaced angular intervals. These support arms 62 engage and are seated on a circular seating surface 64 provided by the terminating circular edge of the bottom side wall region 34 of the bottom outer housing section 28 .
- the bottom housing section 28 can serve to locate, support and seat the lower bearing member 44 and thereby serves as a base upon which the internal components of the scroll compressor assembly can be supported.
- the lower bearing member 44 in turn supports the cylindrical motor housing 48 by virtue of a circular seat 66 formed on a plate-like ledge region 68 of the lower bearing member 44 that projects outward along the top of the central hub 58 .
- the support arms 62 also preferably are closely toleranced relative to the inner diameter of the central housing section 24 .
- the arms 62 may engage with the inner diameter surface of the central housing section 24 to centrally locate the lower bearing member 44 and thereby maintain position of the central axis 54 . This can be by way of an interference and press-fit support arrangement between the lower bearing member 44 and the outer housing 12 .
- the lower bearing member 44 engages with the lower housing section 28 which is in turn attached to center section 24 .
- the outer motor housing 48 may be supported with an interference and press-fit along the stepped seat 66 of the lower bearing member 44 .
- screws may be used to securely fasten the motor housing 48 to the lower bearing member 44 .
- the drive shaft 46 further includes an offset eccentric drive section 74 that has a cylindrical drive surface 75 about an offset axis that is offset relative to the central axis 54 .
- This offset drive section 74 is journaled within a cavity of the movable scroll member 112 of the scroll compressor 14 to drive the movable scroll member 112 of the scroll compressor 14 about an orbital path when the drive shaft 46 is rotated about the central axis 54 .
- the outer housing 12 provides an oil lubricant sump 76 at the bottom end in which suitable oil lubricant is provided.
- the drive shaft 46 has an impeller tube 47 that acts as an oil pump when the drive shaft 46 is spun and thereby pumps oil out of the lubricant sump 76 into an internal lubricant passageway 80 within the drive shaft 46 .
- centrifugal force acts to drive lubricant oil up through the lubricant passageway 80 against the action of gravity.
- the lubricant passageway 80 include various radial passages to feed oil through centrifugal force to appropriate bearing surfaces and thereby lubricate sliding surfaces as may be desired.
- the upper bearing member, or crankcase, 42 includes a central bearing hub 87 into which the drive shaft 46 is journaled for rotation. Extending outward from the central bearing hub 87 is a disk-like portion 86 that terminates in an intermittent perimeter support surface 88 .
- the central bearing hub 87 extends below the disk-like portion 86 , while an unfastened thrust plate 84 is assembled above the disk-like portion 86 and contains a thrust plate surface 96 , which provides axial support for the moveable scroll compressor body 112 .
- the intermittent perimeter support surface 88 is adapted to have an interference and press-fit with the outer housing 12 . It is understood that alternate embodiments of the invention may include crankcase posts with threaded holes to receive fasteners for assembly. Alternate embodiments of the invention also include those in which the posts are integral with a pilot ring instead of the crankcase.
- the location of the thrust plate is typically fixed axially, radially, and rotationally by a plurality of fasteners, such as threaded bolts.
- the thrust plate 84 is concentrically located within a cylindrical portion of the upper bearing member. More specifically, the thrust plate 84 is retained radially by an inner pilot diameter of the crankcase 42 with a small radial clearance, and retained axially by the crankcase 42 on the bottom, and by the movable scroll compressor member 112 on the top.
- crankcase 42 /thrust plate 84 pilot interface to be the primary radial constraint, and for the crankcase 42 and movable scroll compressor member 112 to serve as the axial restraints of the thrust plate 84 .
- the thrust plate 84 of the present invention has no rotational restraint.
- Positional error after machining can cause deformation of the thrust plate surface 96 if the bolts fasten these parts together.
- Deformation of the thrust plate surface 96 against a flat movable scroll compressor member thrust plate surface 96 can cause “hot spots” where increased pressure at the high spots on the warped thrust plate 84 meets the movable scroll compressor member 112 .
- Embodiments of the present invention also serve to reduce manufacturing costs by eliminating the machining necessary to create the bolt holes in the thrust plate 84 , and the threaded holes in the crankcase 42 . Further, multiple fasteners are eliminated, thus removing their cost from the compressor assembly cost, and removing the labor cost of assembling these fasteners, reducing the compressor assembly time, and reducing the potential for deformation of the thrust plate surface due to bolt tightening.
- the plate 84 will wear in evenly, “seeking” an ideal worn surface complementary of the mating surface on the movable scroll compressor member 112 .
- the floating, or unfastened, configuration of the thrust plate 84 will allow the for thrust plate 84 to “seek” a low resistance orientation and operate in that orientation, thus reducing the power needed to movable scroll compressor member 112 , thus increasing overall compressor efficiency.
- crankcase 42 pilot inner diameter 104 is defined by a cylindrical recess in a top portion of the crankcase 42 , such that the thrust plate 84 nests within the cylindrical recess.
- the cylindrical recess is bounded by a top surface 109 of the crankcase 42 and by the crankcase pilot inner diameter 104 . Further, by allowing the thrust plate 84 to move, the total relative sliding motion is reduced between the movable scroll compressor member 112 and the thrust plate 84 , and some motion is transferred to a bottom face 108 of the thrust plate 84 . This extends the life of the thrust plate 84 and movable scroll compressor member 112 by reducing wear on their respective surfaces.
- a relatively small radial clearance between the thrust plate outer diameter 106 and the crankcase pilot inner diameter 104 reduces the hertzian stress, reduces the possibility of thrust plate 84 /crankcase 42 impact, and thus reduces the possibility of noise.
- the radial gap must be optimized for reduction is noise, reduction in hertzian stress, balance of relative motion between the an interface of the movable scroll compressor member 112 and the thrust plate surface 96 , and the interface of the thrust plate bottom surface 108 and the mating top surface 109 of the crankcase 42 , while maintaining sufficient surface overlap between the thrust plate 84 and it's mating members to maintain an oil film all around.
- the hertzian stresses and accompanying noise are reduced by maintaining the radial clearance between the thrust plate outer diameter 106 and crankcase pilot inner diameter 104 within a range of RC 3 through RC 8 based on standard ANSI B4.1 engineering and manufacturing tolerance fit limits.
- Running and sliding fits (RC) are intended to provide a similar running performance, with lubrication allowance, throughout a range of sizes.
- RC fits are scalable measures in which the allowable clearances change with the size of the parts being considered.
- RC 3 indicates precision running fits, which are the closest fits that can be expected to run freely, and are intended for precision work at slow speeds and light journal pressures, but are not suitable where appreciable temperature differences are likely to be encountered.
- RC 8 indicates loose running fits intended for use where wide commercial tolerances may be necessary, together with an allowance, on the external member.
- the allowable range of fits for radial clearance between the thrust plate 84 and crankcase 42 is RC 3 to RC 8, but preferably from RC 5 to RC 8.
- This relatively looser range of running clearances allows for the high speeds and high temperatures likely to occur at the interfaces between the movable scroll member 112 and thrust plate 84 , as well as between the thrust plate 84 and the crankcase 42 under normal operating conditions.
- first and second scroll compressor bodies which preferably include a relatively stationary fixed scroll compressor member 110 and a second scroll compressor member 112 movable relative to the fixed scroll compressor member 110 .
- fixed generally means stationary or immovable in the context of this application, more specifically “fixed” refers to the non-orbiting, non-driven scroll member, as it is acknowledged that some limited range of axial, radial, and rotational movement is possible due to thermal expansion and/or design tolerances.
- the second scroll compressor member 112 is arranged for orbital movement relative to the fixed scroll compressor member 110 for the purpose of compressing refrigerant.
- the fixed scroll compressor member 110 includes a first rib 114 projecting axially from a plate-like base 116 and is designed in the form of a spiral.
- the second movable scroll compressor body 112 includes a second scroll rib 118 projecting axially from a plate-like base 120 and is in the design form of a similar spiral.
- the scroll ribs 114 , 118 engage in one another and abut sealingly on the respective base surfaces 120 , 116 of the respectively other compressor body 112 , 110 .
- multiple compression chambers 122 are formed between the scroll ribs 114 , 118 and the bases 120 , 116 of the respective compressor bodies 112 , 110 .
- progressive compression of refrigerant takes place. Refrigerant flows with an initial low pressure via an intake area 124 surrounding the scroll ribs 114 , 118 in the outer radial region.
- the refrigerant exits via a discharge port 126 which is defined centrally within the base 116 of the fixed scroll compressor member 110 .
- Refrigerant that has been compressed to a high pressure can exit the chambers 122 via the discharge port 126 during operation of the scroll compressor.
- the movable scroll compressor body 112 engages the eccentric offset drive section 74 of the drive shaft 46 . More specifically, the receiving portion of the movable scroll compressor body 112 includes a cylindrical bushing drive hub 128 which slideably receives the eccentric offset drive section 74 with a slideable bearing surface provided therein. In detail, the eccentric offset drive section 74 engages the cylindrical drive hub 128 in order to move the second scroll compressor member 112 about an orbital path about the central axis 54 during rotation of the drive shaft 46 about the central axis 54 . Considering that this offset relationship causes a weight imbalance relative to the central axis 54 , the assembly preferably includes a counter weight 130 that is mounted at a fixed angular orientation to the drive shaft 46 .
- the counter weight 130 acts to offset the weight imbalance caused by the eccentric offset drive section 74 and the movable scroll compressor body 112 that is driven about an orbital path (e.g. among other things, the scroll rib is not equally balanced).
- the counter weight 130 includes an attachment collar 132 and an offset weight region 134 (see counter weight 130 shown in FIGS. 2 and 3 ) that provides for the counter weight effect and thereby balancing of the forces of the rotating components about the central axis 54 . This provides for reduced vibration and noise of the overall assembly by internally balancing or canceling out inertial forces.
- the guiding movement of the scroll compressor can be seen.
- an appropriate key coupling 140 may be provided. Keyed couplings are often referred to in the scroll compressor art as an “Oldham Coupling.”
- the key coupling 140 includes an outer ring body 142 and includes two first keys 144 that are linearly spaced along a first lateral axis 146 and that slide closely and linearly within two respective keyway tracks 148 that are linearly spaced and aligned along the first axis 146 as well.
- the key way tracks 148 are defined by the stationary fixed scroll compressor member 110 such that the linear movement of the key coupling 140 along the first lateral axis 146 is a linear movement relative to the outer housing 12 and perpendicular to the central axis 54 .
- the keys can comprise slots, grooves or, as shown, projections which project from the ring body 142 of the key coupling 140 . This control of movement along the first lateral axis 146 guides part of the overall orbital path of the second scroll compressor member 112 .
- the key coupling includes four second keys 152 in which opposed pairs of the second keys 152 are linearly aligned substantially parallel relative to a second traverse lateral axis 154 that is perpendicular to the first lateral axis 146 .
- the guide portions 156 linearly engage and are guided for linear movement along the second traverse lateral axis 154 by virtue of sliding linear guiding movement of the guide portions 156 along sets of the second keys 152 .
- the second scroll compressor member 112 has movement restrained relative to the fixed scroll compressor member 110 along the first lateral axis 146 and second traverse lateral axis 154 .
- the fixed scroll compressor member 110 limits motion of the key coupling 140 to linear movement along the first lateral axis 146 ; and in turn, the key coupling 140 when moving along the first lateral axis 146 carries the moveable scroll 112 along the first lateral axis 146 therewith.
- the movable scroll compressor body 112 can independently move relative to the key coupling 140 along the second traverse lateral axis 154 by virtue of relative sliding movement afforded by the guide portions 156 which are received and slide between the second keys 152 .
- the eccentric motion that is afforded by the eccentric offset drive section 74 of the drive shaft 46 upon the cylindrical drive hub 128 of the movable scroll compressor body 112 is translated into an orbital path movement of the movable scroll compressor body 112 relative to the fixed scroll compressor member 110 .
- this body 110 is fixed to the upper bearing member 42 , capturing the second scroll compressor member 112 between the fixed scroll member 110 and the upper bearing member 42 .
- the fixed scroll compressor body 110 together with the separator plate 30 , separates a high pressure chamber 180 from the relatively lower pressure region of the compressor 14 contained within the outer housing 12 .
- the central hub 178 of the fixed scroll compressor 110 body includes a circumferential O-ring groove 177 , and when assembled with an O-ring 179 , seals against the central cylindrical bore of the separator plate 30 , preventing the return of high pressure compressed refrigerant to the relatively lower pressure region of the compressor assembly 14 .
- a fillet weld joins the end face of the outer cylindrical wall section of the separator plate 30 with the inside surface of the top end housing section 26 , thus preventing the return of high pressure compressed refrigerant to the relatively lower pressure region of the compressor assembly 14 .
- the fillet weld allows for the separator plate 30 to be assembled to the top end housing section 26 prior to final assembly and weld of the compressor housing 12 . This allows for inspection and confirmation of positional alignment between the central axis 54 of the top end housing section 26 and the central cylindrical bore of the separator plate 30 .
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
A scroll compressor with unfastened thrust plate includes a compressor housing and scroll compressor bodies disposed in the compressor housing. The scroll bodies include a fixed scroll body and a moveable scroll body. The fixed and moveable scroll bodies have respective bases and respective scroll ribs that project from the respective bases. The scroll ribs mutually engage. The moveable scroll body is movable relative to the fixed scroll body for compressing fluid. An upper bearing member provides axial thrust support to the moveable scroll compressor body through a bearing support via an unfastened thrust plate that is located between the upper bearing member and the moveable scroll body. The unfastened thrust plate has no means of attachment to the upper bearing member or to the moveable scroll body.
Description
- This invention generally relates to scroll compressors for compressing refrigerant.
- A scroll compressor is a certain type of compressor that is used to compress refrigerant for such applications as refrigeration, air conditioning, industrial cooling and freezer applications, and/or other applications where compressed fluid may be used. Such prior scroll compressors are known, for example, as exemplified in U.S. Pat. No. 6,398,530 to Hasemann; U.S. Pat. No. 6,814,551, to Kammhoff et al.; U.S. Pat. No. 6,960,070 to Kammhoff et al.; U.S. Pat. No. 7,112,046 to Kammhoff et al.; and U.S. Pat. No. 7,997,877, to Beagle et al., all of which are assigned to a Bitzer entity closely related to the present assignee. As the present disclosure pertains to improvements that can be implemented in these or other scroll compressor designs, the disclosures of U.S. Pat. Nos. 6,398,530, 7,112,046, 6,814,551, 7,997,877 and 6,960,070 are hereby incorporated by reference in their entireties.
- Additionally, particular embodiments of scroll compressors are disclosed in U.S. Pat. No. 6,582,211 to Wallis et al., U.S. Pat. No. 6,428,292 to Wallis et al., and U.S. Pat. No. 6,171,084 to Wallis et al., the teachings and disclosures of which are hereby incorporated by reference in their entireties.
- As is exemplified by these patents, scroll compressors conventionally include an outer housing having a scroll compressor contained therein. A scroll compressor includes first and second scroll compressor members. A first compressor member is typically arranged stationary and fixed in the outer housing. A second scroll compressor member is moveable relative to the first scroll compressor member in order to compress refrigerant between respective scroll ribs which rise above the respective bases and engage in one another. Conventionally the moveable scroll compressor member is driven about an orbital path about a central axis for the purpose of compressing refrigerant. An appropriate drive unit, typically an electric motor, is usually provided within the same housing to drive the movable scroll member.
- Embodiments of the present invention represent an advancement of the state of the art for scroll compressors. These and other advantages of the invention, as well as additional inventive features, will be apparent from the description of the invention provided herein.
- In one aspect, embodiments of the invention provide a scroll compressor with unfastened thrust plate includes a compressor housing and scroll compressor bodies disposed in the compressor housing. The scroll bodies include a fixed scroll body and a moveable scroll body. The fixed and moveable scroll bodies have respective bases and respective scroll ribs that project from the respective bases. The scroll ribs mutually engage. The moveable scroll body is movable relative to the fixed scroll body for compressing fluid. An upper bearing member provides axial thrust support to the moveable scroll compressor body through a bearing support via an unfastened thrust plate that is located between the upper bearing member and the moveable scroll body. The unfastened thrust plate has no means of attachment to the upper bearing member or to the moveable scroll body.
- In a particular embodiment, the unfastened thrust plate is rotationally unconstrained. In some embodiments, the unfastened thrust plate is constrained radially by an upper bearing member. The unfastened thrust plate may be concentrically located within a cylindrical portion of the upper bearing member. Furthermore, the unfastened thrust plate may be constrained axially by the upper bearing member and the moveable scroll body. In certain embodiments, the unfastened thrust plate has a central opening to accommodate a drive shaft of the compressor. Also, the unfastened thrust plate may include a central hub that defines the central opening. In a further embodiment, the unfastened thrust plate has a plate-like perimeter region, and wherein the central hub is raised above the plate-like region.
- In a certain embodiment of the invention, the unfastened thrust plate nests within a cylindrical recess in a top of the upper bearing member. In this embodiment, a radial clearance between the unfastened thrust plate and the upper bearing member ranges from RC 3 to RC 8 based on the ANSI B4.1 tolerance fit limits, but more preferably ranges from RC 3 to RC 5. In this case, the radial clearance may be defined as the average distance between an outer diameter of the unfastened thrust plate and an inner diameter of the upper bearing member.
- Other aspects, objectives and advantages of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
- The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention and, together with the description, serve to explain the principles of the invention. In the drawings:
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FIG. 1 is a cross-sectional isometric view of a scroll compressor assembly, according to an embodiment of the invention; -
FIG. 2 is a cross-sectional isometric view of an upper portion of the scroll compressor assembly ofFIG. 1 ; -
FIG. 3 is a cross-sectional isometric view of a top portion of the scroll compressor assembly ofFIG. 1 ; -
FIG. 4 is a cross-sectional isometric view of a lower portion of the scroll compressor assembly ofFIG. 1 ; and -
FIG. 5 is a perspective view of an exemplary key coupling and movable scroll compressor body, according to an embodiment of the invention. - While the invention will be described in connection with certain preferred embodiments, there is no intent to limit it to those embodiments. On the contrary, the intent is to cover all alternatives, modifications and equivalents as included within the spirit and scope of the invention as defined by the appended claims.
- An embodiment of the present invention is illustrated in
FIGS. 1-4 as ascroll compressor assembly 10 generally including anouter housing 12 in which ascroll compressor 14 can be driven by adrive unit 16. Thescroll compressor assembly 10 may be arranged in a refrigerant circuit for refrigeration, industrial cooling, freezing, air conditioning or other appropriate applications where compressed fluid is desired. Appropriate connection ports provide for connection to a refrigeration circuit and include arefrigerant inlet port 18 and arefrigerant outlet port 20 extending through theouter housing 12. Thescroll compressor assembly 10 is operable through operation of thedrive unit 16 to operate thescroll compressor 14 and thereby compress an appropriate refrigerant or other fluid that enters therefrigerant inlet port 18 and exits therefrigerant outlet port 20 in a compressed high-pressure state. - The
outer housing 12 for thescroll compressor assembly 10 may take many forms. In particular embodiments of the invention, theouter housing 12 includes multiple shell sections. In the embodiment ofFIG. 1 , theouter housing 12 includes a centralcylindrical housing section 24, and a topend housing section 26, and a bottomend housing section 28. In certain embodiments, thehousing sections outer housing 12 enclosure. However, if disassembly of the housing is desired, other housing assembly provisions can be made that can include metal castings or machined components, wherein thehousing sections - As can be seen in the embodiment of
FIG. 1 , thecentral housing section 24 is cylindrical, joined with the topend housing section 26. In this embodiment, a separator in the form ofseparator plate 30 is disposed in the topend housing section 26. Each of the top and bottomend housing sections side wall regions center section 24 and provide for closing off the top and bottom ends of theouter housing 12. As can be seen inFIG. 1 , the topside wall region 32 telescopically overlaps thecentral housing section 24 and is exteriorly welded along a circular welded region to the top end of thecentral housing section 24. Similarly, a bottom portion of the centralcylindrical housing section 24 overlaps theside wall region 34. - During assembly, these components may be assembled such that when the top
end housing section 26 is joined to the centralcylindrical housing section 24, a single weld around the circumference of theouter housing 12 joins the topend housing section 26, theseparator plate 30, and the centralcylindrical housing section 24. In particular embodiments, the centralcylindrical housing section 24 is welded to thebottom shell 28, though, as stated above, alternate embodiments would include other methods of joining (e.g., fasteners) these sections of theouter housing 12. - While the
separator plate 30 could be a stamped steel component, it could also be constructed as a cast and/or machined member (and may be made from steel or aluminum) to provide the ability and structural features necessary to operate in proximity to the high-pressure refrigerant gases output by thescroll compressor 14. By casting or machining theseparator plate 30 in this manner, heavy stamping of such components can be avoided. - Assembly of the
outer housing 12 results in the formation of anenclosed chamber 31 that surrounds thedrive unit 16, and partially surrounds thescroll compressor 14. In particular embodiments, the topend housing section 26 is generally dome-shaped and includes a respective cylindricalside wall region 32 that abuts the top of the centralcylindrical housing section 24, and provides for closing off the top end of theouter housing 12. - In a particular embodiment, the
drive unit 16 in is the form of anelectrical motor assembly 40. Theelectrical motor assembly 40 operably rotates and drives ashaft 46. Further, theelectrical motor assembly 40 generally includes an outerannular motor housing 48, astator 50 comprising electrical coils and arotor 52 that is coupled to thedrive shaft 46 for rotation together. In a particular embodiment, therotor 52 is mounted on thedrive shaft 46, which is supported by upper andlower bearing members stator 50 is operative to rotatably drive therotor 52 and thereby rotate thedrive shaft 46 about acentral axis 54. - Applicant notes that when the terms “axial” and “radial” are used herein to describe features of components or assemblies, they are defined with respect to the
central axis 54. Specifically, the term “axial” or “axially-extending” refers to a feature that projects or extends in a direction generally parallel to thecentral axis 54, while the terms “radial” or “radially-extending” indicates a feature that projects or extends in a direction generally perpendicular to thecentral axis 54. Some minor variation from parallel and perpendicular is permissible. - With reference to
FIGS. 1 and 4 , thelower bearing member 44 includes a central generallycylindrical hub 58 that includes a central bushing and opening to provide acylindrical bearing 60 to which thedrive shaft 46 is journaled for rotational support. A plurality ofarms 62 and typically at least three arms project radially outward from the bearingcentral hub 58 preferably at equally spaced angular intervals. Thesesupport arms 62 engage and are seated on acircular seating surface 64 provided by the terminating circular edge of the bottomside wall region 34 of the bottomouter housing section 28. As such, thebottom housing section 28 can serve to locate, support and seat thelower bearing member 44 and thereby serves as a base upon which the internal components of the scroll compressor assembly can be supported. - Referring to
FIG. 4 , thelower bearing member 44 in turn supports thecylindrical motor housing 48 by virtue of acircular seat 66 formed on a plate-like ledge region 68 of thelower bearing member 44 that projects outward along the top of thecentral hub 58. Thesupport arms 62 also preferably are closely toleranced relative to the inner diameter of thecentral housing section 24. Thearms 62 may engage with the inner diameter surface of thecentral housing section 24 to centrally locate thelower bearing member 44 and thereby maintain position of thecentral axis 54. This can be by way of an interference and press-fit support arrangement between thelower bearing member 44 and theouter housing 12. Alternatively, according to a more preferred configuration shown inFIG. 1 , thelower bearing member 44 engages with thelower housing section 28 which is in turn attached tocenter section 24. Likewise, theouter motor housing 48 may be supported with an interference and press-fit along the steppedseat 66 of thelower bearing member 44. In some embodiments, screws may be used to securely fasten themotor housing 48 to thelower bearing member 44. - The
drive shaft 46 further includes an offseteccentric drive section 74 that has acylindrical drive surface 75 about an offset axis that is offset relative to thecentral axis 54. This offsetdrive section 74 is journaled within a cavity of themovable scroll member 112 of thescroll compressor 14 to drive themovable scroll member 112 of thescroll compressor 14 about an orbital path when thedrive shaft 46 is rotated about thecentral axis 54. To provide for lubrication of all of these bearing surfaces, theouter housing 12 provides anoil lubricant sump 76 at the bottom end in which suitable oil lubricant is provided. Thedrive shaft 46 has animpeller tube 47 that acts as an oil pump when thedrive shaft 46 is spun and thereby pumps oil out of thelubricant sump 76 into aninternal lubricant passageway 80 within thedrive shaft 46. During rotation of thedrive shaft 46, centrifugal force acts to drive lubricant oil up through thelubricant passageway 80 against the action of gravity. In are particular embodiment, thelubricant passageway 80 include various radial passages to feed oil through centrifugal force to appropriate bearing surfaces and thereby lubricate sliding surfaces as may be desired. - As shown in
FIGS. 1 and 2 , the upper bearing member, or crankcase, 42 includes acentral bearing hub 87 into which thedrive shaft 46 is journaled for rotation. Extending outward from thecentral bearing hub 87 is a disk-like portion 86 that terminates in an intermittentperimeter support surface 88. In the embodiments ofFIGS. 2 and 3 , thecentral bearing hub 87 extends below the disk-like portion 86, while anunfastened thrust plate 84 is assembled above the disk-like portion 86 and contains athrust plate surface 96, which provides axial support for the moveablescroll compressor body 112. In certain embodiments, the intermittentperimeter support surface 88 is adapted to have an interference and press-fit with theouter housing 12. It is understood that alternate embodiments of the invention may include crankcase posts with threaded holes to receive fasteners for assembly. Alternate embodiments of the invention also include those in which the posts are integral with a pilot ring instead of the crankcase. - In conventional scroll compressors, the location of the thrust plate is typically fixed axially, radially, and rotationally by a plurality of fasteners, such as threaded bolts. In the
unfastened thrust plate 84 of the current invention, as shown inFIGS. 1 and 2 , thethrust plate 84 is concentrically located within a cylindrical portion of the upper bearing member. More specifically, thethrust plate 84 is retained radially by an inner pilot diameter of thecrankcase 42 with a small radial clearance, and retained axially by thecrankcase 42 on the bottom, and by the movablescroll compressor member 112 on the top. Removing the fastening bolts allows thecrankcase 42/thrust plate 84 pilot interface to be the primary radial constraint, and for thecrankcase 42 and movablescroll compressor member 112 to serve as the axial restraints of thethrust plate 84. Thethrust plate 84 of the present invention has no rotational restraint. - Positional error after machining can cause deformation of the
thrust plate surface 96 if the bolts fasten these parts together. Deformation of thethrust plate surface 96 against a flat movable scroll compressor member thrustplate surface 96 can cause “hot spots” where increased pressure at the high spots on thewarped thrust plate 84 meets the movablescroll compressor member 112. - Embodiments of the present invention also serve to reduce manufacturing costs by eliminating the machining necessary to create the bolt holes in the
thrust plate 84, and the threaded holes in thecrankcase 42. Further, multiple fasteners are eliminated, thus removing their cost from the compressor assembly cost, and removing the labor cost of assembling these fasteners, reducing the compressor assembly time, and reducing the potential for deformation of the thrust plate surface due to bolt tightening. - In the event that unbalanced sliding friction causes the
unfastened thrust plate 84 to rotate in position, theplate 84 will wear in evenly, “seeking” an ideal worn surface complementary of the mating surface on the movablescroll compressor member 112. Lastly, if either part has a minor surface flatness error, the floating, or unfastened, configuration of thethrust plate 84 will allow the forthrust plate 84 to “seek” a low resistance orientation and operate in that orientation, thus reducing the power needed to movablescroll compressor member 112, thus increasing overall compressor efficiency. - As the movable
scroll compressor member 112 orbits, frictional forces transmitted through itsthrust plate surface 96 to thethrust plate 84 act to carry thethrust plate 84 along that orbit with it. Thethrust plate 84 contacts a crankcase pilotinner diameter 104 which restrains thethrust plate 84 rotationally such that locally, thethrust plate 84outer diameter 106 does not slide relative to the crankcase 42 pilotinner diameter 104. Locally, thethrust plate 84 rolls on itsouter diameter 106, along the surface of thepilot diameter 104 of thecrankcase 42. In a particular embodiment, thecrankcase 42 pilotinner diameter 104 is defined by a cylindrical recess in a top portion of thecrankcase 42, such that thethrust plate 84 nests within the cylindrical recess. The cylindrical recess is bounded by atop surface 109 of thecrankcase 42 and by the crankcase pilotinner diameter 104. Further, by allowing thethrust plate 84 to move, the total relative sliding motion is reduced between the movablescroll compressor member 112 and thethrust plate 84, and some motion is transferred to abottom face 108 of thethrust plate 84. This extends the life of thethrust plate 84 and movablescroll compressor member 112 by reducing wear on their respective surfaces. - To reduce any noise associated with the
unfastened thrust plate 84 during compressor operation, a relatively small radial clearance between the thrust plateouter diameter 106 and the crankcase pilotinner diameter 104. Maintaining such a small radial clearance reduces the hertzian stress, reduces the possibility ofthrust plate 84/crankcase 42 impact, and thus reduces the possibility of noise. The radial gap must be optimized for reduction is noise, reduction in hertzian stress, balance of relative motion between the an interface of the movablescroll compressor member 112 and thethrust plate surface 96, and the interface of the thrust platebottom surface 108 and the matingtop surface 109 of thecrankcase 42, while maintaining sufficient surface overlap between thethrust plate 84 and it's mating members to maintain an oil film all around. - In a particular embodiment, the hertzian stresses and accompanying noise are reduced by maintaining the radial clearance between the thrust plate
outer diameter 106 and crankcase pilotinner diameter 104 within a range of RC 3 through RC 8 based on standard ANSI B4.1 engineering and manufacturing tolerance fit limits. Running and sliding fits (RC) are intended to provide a similar running performance, with lubrication allowance, throughout a range of sizes. Thus, RC fits are scalable measures in which the allowable clearances change with the size of the parts being considered. But, as stated above, the range of clearances associated with a particular RC fit number is intended to provide similar running performance RC 3 indicates precision running fits, which are the closest fits that can be expected to run freely, and are intended for precision work at slow speeds and light journal pressures, but are not suitable where appreciable temperature differences are likely to be encountered. At the other end of the range, RC 8 indicates loose running fits intended for use where wide commercial tolerances may be necessary, together with an allowance, on the external member. - As stated above, the allowable range of fits for radial clearance between the
thrust plate 84 andcrankcase 42 is RC 3 to RC 8, but preferably from RC 5 to RC 8. This relatively looser range of running clearances allows for the high speeds and high temperatures likely to occur at the interfaces between themovable scroll member 112 and thrustplate 84, as well as between thethrust plate 84 and thecrankcase 42 under normal operating conditions. - Turning in greater detail to the
scroll compressor 14, the scroll compressor body is provided by first and second scroll compressor bodies which preferably include a relatively stationary fixedscroll compressor member 110 and a secondscroll compressor member 112 movable relative to the fixedscroll compressor member 110. While the term “fixed” generally means stationary or immovable in the context of this application, more specifically “fixed” refers to the non-orbiting, non-driven scroll member, as it is acknowledged that some limited range of axial, radial, and rotational movement is possible due to thermal expansion and/or design tolerances. - The second
scroll compressor member 112 is arranged for orbital movement relative to the fixedscroll compressor member 110 for the purpose of compressing refrigerant. The fixedscroll compressor member 110 includes afirst rib 114 projecting axially from a plate-like base 116 and is designed in the form of a spiral. Similarly, the second movablescroll compressor body 112 includes asecond scroll rib 118 projecting axially from a plate-like base 120 and is in the design form of a similar spiral. - The
scroll ribs other compressor body multiple compression chambers 122 are formed between thescroll ribs bases respective compressor bodies chambers 122, progressive compression of refrigerant takes place. Refrigerant flows with an initial low pressure via anintake area 124 surrounding thescroll ribs discharge port 126 which is defined centrally within thebase 116 of the fixedscroll compressor member 110. Refrigerant that has been compressed to a high pressure can exit thechambers 122 via thedischarge port 126 during operation of the scroll compressor. - The movable
scroll compressor body 112 engages the eccentric offsetdrive section 74 of thedrive shaft 46. More specifically, the receiving portion of the movablescroll compressor body 112 includes a cylindricalbushing drive hub 128 which slideably receives the eccentric offsetdrive section 74 with a slideable bearing surface provided therein. In detail, the eccentric offsetdrive section 74 engages thecylindrical drive hub 128 in order to move the secondscroll compressor member 112 about an orbital path about thecentral axis 54 during rotation of thedrive shaft 46 about thecentral axis 54. Considering that this offset relationship causes a weight imbalance relative to thecentral axis 54, the assembly preferably includes acounter weight 130 that is mounted at a fixed angular orientation to thedrive shaft 46. - The
counter weight 130 acts to offset the weight imbalance caused by the eccentric offsetdrive section 74 and the movablescroll compressor body 112 that is driven about an orbital path (e.g. among other things, the scroll rib is not equally balanced). Thecounter weight 130 includes anattachment collar 132 and an offset weight region 134 (seecounter weight 130 shown inFIGS. 2 and 3 ) that provides for the counter weight effect and thereby balancing of the forces of the rotating components about thecentral axis 54. This provides for reduced vibration and noise of the overall assembly by internally balancing or canceling out inertial forces. - With reference to
FIGS. 3 and 5 , the guiding movement of the scroll compressor can be seen. To guide the orbital movement of the movablescroll compressor body 112 relative to the fixedscroll compressor member 110, an appropriatekey coupling 140 may be provided. Keyed couplings are often referred to in the scroll compressor art as an “Oldham Coupling.” In this embodiment, thekey coupling 140 includes anouter ring body 142 and includes twofirst keys 144 that are linearly spaced along a firstlateral axis 146 and that slide closely and linearly within two respective keyway tracks 148 that are linearly spaced and aligned along thefirst axis 146 as well. The key way tracks 148 are defined by the stationary fixedscroll compressor member 110 such that the linear movement of thekey coupling 140 along the firstlateral axis 146 is a linear movement relative to theouter housing 12 and perpendicular to thecentral axis 54. The keys can comprise slots, grooves or, as shown, projections which project from thering body 142 of thekey coupling 140. This control of movement along the firstlateral axis 146 guides part of the overall orbital path of the secondscroll compressor member 112. - Additionally, the key coupling includes four
second keys 152 in which opposed pairs of thesecond keys 152 are linearly aligned substantially parallel relative to a secondtraverse lateral axis 154 that is perpendicular to the firstlateral axis 146. There are two sets of thesecond keys 152 that act cooperatively to receive projecting slidingguide portions 156 that project from the base 120 on opposite sides of the movablescroll compressor body 112. Theguide portions 156 linearly engage and are guided for linear movement along the secondtraverse lateral axis 154 by virtue of sliding linear guiding movement of theguide portions 156 along sets of thesecond keys 152. - By virtue of the
key coupling 140, the secondscroll compressor member 112 has movement restrained relative to the fixedscroll compressor member 110 along the firstlateral axis 146 and secondtraverse lateral axis 154. This results in the prevention of any relative rotation of the moveable scroll body as it allows only translational motion. More particularly, the fixedscroll compressor member 110 limits motion of thekey coupling 140 to linear movement along the firstlateral axis 146; and in turn, thekey coupling 140 when moving along the firstlateral axis 146 carries themoveable scroll 112 along the firstlateral axis 146 therewith. Additionally, the movablescroll compressor body 112 can independently move relative to thekey coupling 140 along the secondtraverse lateral axis 154 by virtue of relative sliding movement afforded by theguide portions 156 which are received and slide between thesecond keys 152. By allowing for simultaneous movement in two mutuallyperpendicular axes drive section 74 of thedrive shaft 46 upon thecylindrical drive hub 128 of the movablescroll compressor body 112 is translated into an orbital path movement of the movablescroll compressor body 112 relative to the fixedscroll compressor member 110. - Referring in greater detail to the fixed
scroll compressor member 110, thisbody 110 is fixed to theupper bearing member 42, capturing the secondscroll compressor member 112 between thefixed scroll member 110 and theupper bearing member 42. In a particular embodiment, the fixedscroll compressor body 110, together with theseparator plate 30, separates ahigh pressure chamber 180 from the relatively lower pressure region of thecompressor 14 contained within theouter housing 12. Thecentral hub 178 of the fixedscroll compressor 110 body includes a circumferential O-ring groove 177, and when assembled with an O-ring 179, seals against the central cylindrical bore of theseparator plate 30, preventing the return of high pressure compressed refrigerant to the relatively lower pressure region of thecompressor assembly 14. At the interface between theseparator plate 30 and the topend housing section 26, a fillet weld joins the end face of the outer cylindrical wall section of theseparator plate 30 with the inside surface of the topend housing section 26, thus preventing the return of high pressure compressed refrigerant to the relatively lower pressure region of thecompressor assembly 14. - The fillet weld allows for the
separator plate 30 to be assembled to the topend housing section 26 prior to final assembly and weld of thecompressor housing 12. This allows for inspection and confirmation of positional alignment between thecentral axis 54 of the topend housing section 26 and the central cylindrical bore of theseparator plate 30. - All references, including publications, patent applications, and patents cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
- The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) is to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
- Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context
Claims (12)
1. A scroll compressor with unfastened thrust plate comprising:
a compressor housing;
scroll compressor bodies disposed in the housing, the scroll bodies including a fixed scroll body and a moveable scroll body, the fixed and moveable scroll bodies having respective bases and respective scroll ribs that project from the respective bases, wherein the scroll ribs mutually engage, the moveable scroll body being movable relative to the fixed scroll body for compressing fluid; and
an upper bearing member which provides axial thrust support to the moveable scroll compressor body through a bearing support via a unfastened thrust plate that is located between the upper bearing member and the moveable scroll body, the unfastened thrust plate having no means of attachment to the upper bearing member or to the moveable scroll body.
2. The scroll compressor of claim 1 , wherein the unfastened thrust plate is rotationally unconstrained.
3. The scroll compressor of claim 1 , wherein the unfastened thrust plate is constrained radially by an upper bearing member.
4. The scroll compressor of claim 3 , wherein the unfastened thrust plate is concentrically located within a portion of the upper bearing member.
5. The scroll compressor of claim 3 , wherein the unfastened thrust plate is constrained axially by the upper bearing member and the moveable scroll body.
6. The scroll compressor of claim 3 , wherein the unfastened thrust plate nests within a cylindrical recess in a top of the upper bearing member.
7. The scroll compressor of claim 6 , wherein a radial clearance between the unfastened thrust plate and the upper bearing member ranges from RC 3 to RC 8 based on the ANSI B4.1 tolerance fit limits.
8. The scroll compressor of claim 7 , wherein a radial clearance between the unfastened thrust plate and the upper bearing member ranges from RC 5 to RC 8 based on the ANSI B4.1 tolerance fit limits.
9. The scroll compressor of claim 7 , wherein the radial clearance is an average distance between an outer diameter of the unfastened thrust plate and an inner diameter of the upper bearing member.
10. The scroll compressor of claim 1 , wherein the unfastened thrust plate has a central opening to accommodate a drive shaft of the compressor.
11. The scroll compressor of claim 10 , wherein the unfastened thrust plate has a central hub that defines the central opening.
12. The scroll compressor of claim 11 , wherein the unfastened thrust plate has a plate-like perimeter region, and wherein the central hub is raised above the plate-like region.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/805,097 US20170022989A1 (en) | 2015-07-21 | 2015-07-21 | Unfastened thrust plate |
PCT/US2016/042953 WO2017015278A1 (en) | 2015-07-21 | 2016-07-19 | Unfastened thrust plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/805,097 US20170022989A1 (en) | 2015-07-21 | 2015-07-21 | Unfastened thrust plate |
Publications (1)
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US20170022989A1 true US20170022989A1 (en) | 2017-01-26 |
Family
ID=57835255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/805,097 Abandoned US20170022989A1 (en) | 2015-07-21 | 2015-07-21 | Unfastened thrust plate |
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US (1) | US20170022989A1 (en) |
WO (1) | WO2017015278A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2712777B2 (en) * | 1990-07-13 | 1998-02-16 | 三菱電機株式会社 | Scroll compressor |
JPH09228967A (en) * | 1996-02-20 | 1997-09-02 | Matsushita Electric Ind Co Ltd | Scroll compressor |
CN104533787B (en) * | 2008-06-16 | 2017-01-18 | 三菱电机株式会社 | Scroll compressor |
JP2012036830A (en) * | 2010-08-06 | 2012-02-23 | Daikin Industries Ltd | Compressor |
JP2012241530A (en) * | 2011-05-16 | 2012-12-10 | Mitsubishi Electric Corp | Scroll compressor |
-
2015
- 2015-07-21 US US14/805,097 patent/US20170022989A1/en not_active Abandoned
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2016
- 2016-07-19 WO PCT/US2016/042953 patent/WO2017015278A1/en active Application Filing
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