US20100172756A1 - Rotary compressor - Google Patents
Rotary compressor Download PDFInfo
- Publication number
- US20100172756A1 US20100172756A1 US12/461,587 US46158709A US2010172756A1 US 20100172756 A1 US20100172756 A1 US 20100172756A1 US 46158709 A US46158709 A US 46158709A US 2010172756 A1 US2010172756 A1 US 2010172756A1
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- United States
- Prior art keywords
- cylinder
- case
- lower cap
- compressing device
- compressor according
- 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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- 230000006835 compression Effects 0.000 claims description 28
- 238000007906 compression Methods 0.000 claims description 28
- 239000003507 refrigerant Substances 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 230000003014 reinforcing effect Effects 0.000 claims description 13
- 238000003466 welding Methods 0.000 description 12
- 230000033001 locomotion Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
-
- 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
-
- 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
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- 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
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
-
- 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
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/23—Manufacture essentially without removing material by permanently joining parts together
- F04C2230/231—Manufacture essentially without removing material by permanently joining parts together by welding
Definitions
- Embodiments of the present invention relate to a rotary compressor, a compressing device of which is fixedly welded inside a case via an improved configuration.
- a rotary compressor In a general rotary compressor, an eccentric part and a roller are coupled to a rotating shaft that is rotated via electromagnetic interaction between a stator and a rotor. As the eccentric part and roller are eccentrically rotated in a compression chamber defined in a cylinder, compression of refrigerant suctioned into the compression chamber is accomplished.
- a vane is supported by a vane spring in the compression chamber while being in contact with a surface of the roller, the vane dividing the compression chamber into a low-pressure chamber for suction of refrigerant and a high-pressure chamber for discharge of compressed refrigerant.
- Such a rotary compressor includes a case provided with a refrigerant suction pipe and a refrigerant discharge pipe, a drive device to generate rotating force, and a compressing device to perform suction and compression of refrigerant.
- the drive device includes a stator, a rotor, and a rotating shaft coupled to the rotor and adapted to be rotated along with the rotor.
- the eccentric part and roller are eccentrically coupled to one end of the rotating shaft thus performing eccentric rotation via rotation of the rotating shaft.
- the compressing device includes the compression chamber in which the eccentric rotation of the eccentric part and roller is performed, the cylinder defining the compression chamber, an upper bearing and a lower flange coupled respectively to upper and lower ends of the cylinder to hermetically seal the cylinder, and the vane dividing the compression chamber into the high pressure chamber and the low pressure chamber, the vane being arranged in contact with an outer periphery of the roller and adapted to perform vertical sliding motion based on the eccentric rotation of the roller.
- the vane is supported by the vane spring in a vane slot defined in one side of the cylinder.
- a region of the case in contact with the cylinder is perforated with a plurality of through-holes, and each of the through-holes is formed with a weld zone to integrally couple the cylinder to the case by welding.
- the plurality of through-holes may be perforated in the case and also, an edge of each through-hole may be welded to the cylinder in a radial direction of the case. This may cause the case to be thermally deformed by heat generated during welding, or the cylinder and the upper bearing to be deformed upon receiving the heat transmitted from the case.
- welding the edge of the through-hole to the cylinder in the radial direction of the case causes distortion of a gap between the stator and the rotor, resulting in excessive drive load of the compressing device and deteriorating compression efficiency and use life thereof.
- a rotary compressor a compressing device of which may be fixed inside a case with a minimized possibility of thermal deformation of a cylinder and an upper bearing, resulting in enhanced efficiency of the compressing device.
- a rotary compressor includes a case defining an external appearance of the compressor, a compressing device arranged inside the case, a lower cap fixed to a lower end of the case, and a weld zone to fix the compressing device and lower cap to each other.
- the weld zone may be formed by at least one reinforcing protrusion extending from the compressing device to the lower cap by a predetermined length.
- the weld zone may be formed by at least one supporting protrusion protruding from the lower cap to the compressing device by a predetermined length.
- the compressing device may include a cylinder defining a compression chamber for compression of refrigerant gas, and a lower bearing to support the cylinder from the lower side of the cylinder, and the weld zone may be formed in a boundary region between the reinforcing protrusion axially provided at the lower bearing and a through-hole perforated in the lower cap.
- the compressing device may include a cylinder defining a compression chamber for compression of refrigerant gas, and a lower bearing to support the cylinder from the lower side of the cylinder, and the weld zone may be formed in a boundary region between a through-hole perforated in the supporting protrusion and the lower bearing.
- the reinforcing protrusion may be provided at a peripheral position of a lower bearing to come into close contact with a bottom surface of the lower cap when the lower cap is fixed to the case.
- the supporting protrusion may be provided at a peripheral position of the lower cap to come into close contact with a lower bearing when the lower cap is fixed to the case.
- the compressing device may further include an upper bearing to support the cylinder from the upper side of the cylinder.
- the rotary compressor may further include a stator fixed to the case, a rotor rotatably supported inside the stator, and a rotating shaft press-fitted in the rotor.
- a rotary compressor in accordance with another aspect of the invention, includes a case, a cylinder arranged inside the case, a lower bearing closely coupled to a lower end of the cylinder, and a lower cap fixedly welded to the lower bearing for fixing the cylinder in an axial direction.
- At least one protrusion may be provided between the lower bearing and the lower cap, to fixedly weld the lower bearing to the lower cap.
- the protrusion may be integrally formed with any one of the lower bearing and the lower cap.
- FIG. 1 is a sectional view illustrating a rotary compressor according to an embodiment of the present invention
- FIG. 2 is an exploded partial sectional view of the rotary compressor shown in FIG. 1 ;
- FIG. 3 is a sectional view illustrating a compressing device and a lower cap of the rotary compressor according to the embodiment
- FIG. 4 is an enlarged perspective view of a lower bearing and the lower cap according to the embodiment
- FIG. 5 is a sectional view illustrating a rotary compressor according to another embodiment.
- FIG. 6 is an enlarged perspective view illustrating a lower cap of the rotary compressor shown in FIG. 5 .
- FIG. 1 is a sectional view illustrating a rotary compressor according to an embodiment
- FIG. 2 is an exploded partial sectional view of the rotary compressor shown in FIG. 1 .
- a rotary compressor 10 includes a case 100 defining an external appearance of the compressor, a drive device 200 to generate drive force, and a compressing device 300 to compress refrigerant gas upon receiving the drive force of the drive device 200 . Both the drive device 200 and the compressing device 300 are arranged inside the cylindrical case 100 .
- the case 100 includes a cylindrical case body 110 in which the drive device 200 and the compressing device 300 are mounted, an upper cap 120 , a part of which is fixedly inserted into an upper end opening of the case body 110 , and a lower cap 130 , a part of which is fixedly inserted into a lower end opening of the case body 110 .
- the upper cap 120 is subjected to welding in a peripheral direction thereof so as to be coupled to an upper end of the case 100
- the lower cap 130 is subjected to welding in a peripheral direction thereof so as to be coupled to a lower end of the case 100 . More particularly, the welding of the upper or lower cap is performed in a peripheral direction such that a fixing weld zone 140 is created in a boundary region between the end of the case 100 and the cap.
- a suction pipe 160 is connected to one side of a lower part of the case 100 , through which refrigerant gas is fed from an accumulator 150 to the compressing device 300 , the accumulator 150 functioning to filter liquid-phase refrigerant.
- a discharge pipe 170 is connected to an upper part of the case 100 , through which the refrigerant gas compressed in the compressing device 300 is discharged.
- An oil storage space 180 is provided in a bottom region of the case 100 , in which a predetermined amount of oil is stored for lubrication and cooling of any frictional member.
- the drive device 200 includes a stator 210 fixed to the case 100 , a rotor 220 rotatably supported inside the stator 210 , and a rotating shaft 230 press-fitted in the rotor 220 .
- a stator 210 fixed to the case 100
- a rotor 220 rotatably supported inside the stator 210
- a rotating shaft 230 press-fitted in the rotor 220 .
- the compressing device 300 includes an eccentric part 310 formed near a lower end of the rotating shaft 230 , a roller 320 fitted around the eccentric part 310 , a cylinder 330 defining a compression chamber 360 in which the roller 320 is received, and an upper bearing 340 and a lower bearing 350 coupled respectively to an upper end and a lower end of the cylinder 330 and adapted to hermetically seal the compression chamber 360 while supporting the rotating shaft 230 .
- the cylinder 300 and the upper and lower bearings 340 and 350 have bolt fastening holes 300 b. As fastening bolts 300 a are fastened through the bolt fastening holes 300 b, the upper and lower bearings 340 and 350 are brought into close contact with upper and lower surfaces of the cylinder 330 , thereby hermetically sealing the compression chamber 360 .
- the cylinder 330 is provided at one side thereof with a suction port 370 , which is connected to the suction pipe 160 connected to the accumulator 150 and is used to feed refrigerant gas into the compression chamber 360 , and at the other side thereof with a discharge port (not shown) to guide the refrigerant gas compressed in the compression chamber 360 to the outside of the compression chamber 360 .
- the upper bearing 340 has a discharge hole 380 formed in communication with the discharge port (not shown) in order to discharge the refrigerant gas guided through the discharge port (not shown) to the outside.
- a valve device 390 is arranged on the upper bearing 340 at a position immediately above the discharge hole 380 and is used to open or close the discharge hole 380 .
- a mixture of refrigerant and oil is introduced through the suction port 370 and is supplied into the compression chamber 360 . Of the mixture, the oil serves to seal the interior of the compression chamber 360 .
- the amount of oil supplied into the compression chamber 360 may be determined to assure appropriate mixing with the refrigerant within a range exerting no degradation in compression efficiency.
- FIG. 3 is a sectional view illustrating the compressing device and the lower cap of the rotary compressor according to the embodiment
- FIG. 4 is an enlarged perspective view of the lower bearing and the lower cap according to the embodiment.
- the compressing device 300 and the lower cap 130 are arranged close to each other, such that a weld zone 400 is created at a contact position therebetween.
- the weld zone 400 may be created in a boundary region between a reinforcing protrusion 353 extending from the compressing device 300 to the lower cap 130 and a through-hole 130 a of the lower cap 130 .
- the lower bearing 350 of the compressing device 300 includes a bearing body 351 in close contact with the lower surface of the cylinder 330 , a rotating shaft inserting portion 352 located at the center of the bearing body 351 and extending perpendicular to the bearing body 351 , through which the rotating shaft 230 is inserted, and at least one reinforcing protrusion 353 extending in an axial direction A of the bearing body 351 .
- the lower cap 130 includes a bottom portion 131 arranged to close the lower end opening of the case 100 , and a peripheral portion 132 extending upward from a peripheral edge of the bottom portion 131 .
- the boundary region between the peripheral portion 132 of the lower cap 130 and the case 100 is subjected to welding in the peripheral direction, to create the fixing weld zone 140 for fixedly welding the lower cap 130 to the case 100 .
- the weld zone 400 is created in the bottom portion 131 via the through-hole 130 a, i.e. in the boundary region between the through-hole 130 a and the lower bearing 350 , thereby fixedly welding the lower bearing 350 to the lower cap 130 .
- the compressing device 300 is fixedly welded to the lower cap 130 located therebelow to thereby be fixed inside the case 100 .
- the cylinder 330 may be fixed inside the case 100 without unwanted movement:
- the reinforcing protrusion 353 extends downward from the lower bearing 350 in the axial direction A, to allow the lower bearing 350 to be welded to the lower cap 130 .
- three cylindrical reinforcing protrusions 353 may be arranged on peripheral positions of a lower surface of the bearing body 351 to extend parallel to the rotating shaft inserting portion 352 in the axial direction A.
- the reinforcing protrusions 353 are simply provided for the purpose of connecting the compressing device 300 to the lower cap 130 for welding therebetween and therefore, the reinforcing protrusions 353 may be replaced by various numbers and shapes of substitutions between the lower bearing 350 and the lower cap 130 .
- stator 210 of the drive device 200 the stator 210 of the drive device 200 , the compressing device 300 , and the rotor 220 of the drive device 200 are sequentially press-fitted into the case 100 . Then, in a state wherein a gap gauge (not shown) is inserted into a gap between the stator 210 and the rotor 220 , a height of the rotary compressor 10 is aligned.
- the peripheral portion 132 of the lower cap 130 is inserted into the lower end opening of the case 100 and is fixedly welded to the case 100 . Then, the bottom portion 131 of the lower cap 130 is welded to the compressing device 300 in the axial direction A, to fix the compressing device 300 inside the case 100 .
- the upper cap 120 is welded to the case 100 , completing the assembly of the rotary compressor 10 .
- the compressing device 300 is welded in the axial direction A of the case 100 , rather than being welded in a radial direction of the case 100 . Therefore, interior elements, such as, e.g., the cylinder 330 and the rotating shaft 230 , may be fixed at positions assuring smooth motions thereof.
- the lower cap 130 is first welded to the case 100 and thereafter, is welded to the compressing device 300 . This assures the welding of the compressing device 300 to have only minimal effect on a gap of the rotary compressor 10 , preventing deterioration in performance of the rotary compressor 10 caused when the stator 210 and rotor 220 of the rotary compressor 10 are incorrectly aligned.
- FIG. 5 is a sectional view illustrating a rotary compressor according to another embodiment
- FIG. 6 is an enlarged perspective view illustrating a lower cap of the rotary compressor shown in FIG. 5 .
- a rotary compressor 10 ′ includes the case 100 defining an external appearance of the compressor 10 ′, a compressing device 300 ′ arranged inside the case 100 , a lower cap 130 ′ coupled to the lower end opening of the case 100 , and a weld zone 400 ′ to fix the compressing device 300 and lower cap 130 ′ to each other.
- the weld zone 400 ′ may be created in a boundary region between a supporting protrusion 133 ′ extending from the lower cap 130 ′ to the compressing device 300 ′ and the compressing device 300 ′.
- the lower cap 130 ′ includes a bottom portion 131 ′ arranged to close the lower end opening of the case 100 , and a peripheral portion 132 ′ extending upward from a peripheral edge of the bottom portion 131 ′. At least one supporting protrusion 133 ′ may protrude upward from the bottom portion 131 ′ and in turn, a through-hole 130 a ′ may be perforated throughout the supporting protrusion 133 ′.
- a certain number of supporting protrusions 133 ′ may be arranged on peripheral positions of the bottom portion 131 ′.
- the number and shape of the supporting protrusions 133 ′ may be determined in various manners so long as the supporting protrusions 133 ′ provide satisfactory connection between the compressing device 300 ′ and the lower cap 130 ′.
- the shape and size of the supporting protrusions 133 ′ may be determined in such a manner that the supporting protrusions 133 ′ formed on the bottom portion 131 ′ come into close contact with the compressing device 300 ′ when the lower cap 130 ′ is inserted into the lower end opening of the case 100 , thereby being fixedly welded to the compressing device 300 ′ via the through-holes 130 a′.
- the compressing device 300 ′ is fixedly welded to the lower cap 130 ′ located therebelow to thereby be fixed inside the case 100 . More particularly, as the cylinder 330 is fixedly welded in the axial direction A to the lower cap 130 ′ via a lower bearing 350 ′ that supports the cylinder 300 , the cylinder 330 may be fixed inside the case 100 without unwanted movement.
- a rotary compressor according to the embodiments is basically configured in such a manner that a compressing device is axially welded to a lower cap, preventing thermal deformation of interior elements while assuring that the interior elements are coupled at accurate positions for smooth motion thereof.
Abstract
A rotary compressor including a case defining an external appearance of the compressor. A compressing device is arranged inside the case, and a lower cap is fixed to a lower end of the case. The rotary compressor further includes a weld zone to fix the compressing device and lower cap to each other.
Description
- This application claims the benefit of Korean Patent Application No. 2009-0000712, filed on Jan. 6, 2009 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
- 1. Field
- Embodiments of the present invention relate to a rotary compressor, a compressing device of which is fixedly welded inside a case via an improved configuration.
- 2. Description of the Related Art
- In a general rotary compressor, an eccentric part and a roller are coupled to a rotating shaft that is rotated via electromagnetic interaction between a stator and a rotor. As the eccentric part and roller are eccentrically rotated in a compression chamber defined in a cylinder, compression of refrigerant suctioned into the compression chamber is accomplished. A vane is supported by a vane spring in the compression chamber while being in contact with a surface of the roller, the vane dividing the compression chamber into a low-pressure chamber for suction of refrigerant and a high-pressure chamber for discharge of compressed refrigerant. Such a rotary compressor includes a case provided with a refrigerant suction pipe and a refrigerant discharge pipe, a drive device to generate rotating force, and a compressing device to perform suction and compression of refrigerant.
- The drive device includes a stator, a rotor, and a rotating shaft coupled to the rotor and adapted to be rotated along with the rotor. The eccentric part and roller are eccentrically coupled to one end of the rotating shaft thus performing eccentric rotation via rotation of the rotating shaft.
- The compressing device includes the compression chamber in which the eccentric rotation of the eccentric part and roller is performed, the cylinder defining the compression chamber, an upper bearing and a lower flange coupled respectively to upper and lower ends of the cylinder to hermetically seal the cylinder, and the vane dividing the compression chamber into the high pressure chamber and the low pressure chamber, the vane being arranged in contact with an outer periphery of the roller and adapted to perform vertical sliding motion based on the eccentric rotation of the roller. The vane is supported by the vane spring in a vane slot defined in one side of the cylinder.
- A region of the case in contact with the cylinder is perforated with a plurality of through-holes, and each of the through-holes is formed with a weld zone to integrally couple the cylinder to the case by welding.
- In the above-described rotary compressor, to fix the cylinder inside the case, the plurality of through-holes may be perforated in the case and also, an edge of each through-hole may be welded to the cylinder in a radial direction of the case. This may cause the case to be thermally deformed by heat generated during welding, or the cylinder and the upper bearing to be deformed upon receiving the heat transmitted from the case. In addition, welding the edge of the through-hole to the cylinder in the radial direction of the case causes distortion of a gap between the stator and the rotor, resulting in excessive drive load of the compressing device and deteriorating compression efficiency and use life thereof.
- Therefore, it is an aspect of the present invention to provide a rotary compressor, a compressing device of which may be fixed inside a case with a minimized possibility of thermal deformation of a cylinder and an upper bearing, resulting in enhanced efficiency of the compressing device.
- Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the invention.
- In accordance with one aspect, a rotary compressor includes a case defining an external appearance of the compressor, a compressing device arranged inside the case, a lower cap fixed to a lower end of the case, and a weld zone to fix the compressing device and lower cap to each other.
- The weld zone may be formed by at least one reinforcing protrusion extending from the compressing device to the lower cap by a predetermined length.
- The weld zone may be formed by at least one supporting protrusion protruding from the lower cap to the compressing device by a predetermined length.
- The compressing device may include a cylinder defining a compression chamber for compression of refrigerant gas, and a lower bearing to support the cylinder from the lower side of the cylinder, and the weld zone may be formed in a boundary region between the reinforcing protrusion axially provided at the lower bearing and a through-hole perforated in the lower cap.
- The compressing device may include a cylinder defining a compression chamber for compression of refrigerant gas, and a lower bearing to support the cylinder from the lower side of the cylinder, and the weld zone may be formed in a boundary region between a through-hole perforated in the supporting protrusion and the lower bearing.
- The reinforcing protrusion may be provided at a peripheral position of a lower bearing to come into close contact with a bottom surface of the lower cap when the lower cap is fixed to the case.
- The supporting protrusion may be provided at a peripheral position of the lower cap to come into close contact with a lower bearing when the lower cap is fixed to the case.
- The compressing device may further include an upper bearing to support the cylinder from the upper side of the cylinder.
- The rotary compressor may further include a stator fixed to the case, a rotor rotatably supported inside the stator, and a rotating shaft press-fitted in the rotor.
- In accordance with another aspect of the invention, a rotary compressor includes a case, a cylinder arranged inside the case, a lower bearing closely coupled to a lower end of the cylinder, and a lower cap fixedly welded to the lower bearing for fixing the cylinder in an axial direction.
- At least one protrusion may be provided between the lower bearing and the lower cap, to fixedly weld the lower bearing to the lower cap.
- The protrusion may be integrally formed with any one of the lower bearing and the lower cap.
- These and/or other aspects of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
-
FIG. 1 is a sectional view illustrating a rotary compressor according to an embodiment of the present invention; -
FIG. 2 is an exploded partial sectional view of the rotary compressor shown inFIG. 1 ; -
FIG. 3 is a sectional view illustrating a compressing device and a lower cap of the rotary compressor according to the embodiment; -
FIG. 4 is an enlarged perspective view of a lower bearing and the lower cap according to the embodiment; -
FIG. 5 is a sectional view illustrating a rotary compressor according to another embodiment; and -
FIG. 6 is an enlarged perspective view illustrating a lower cap of the rotary compressor shown inFIG. 5 . - Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.
-
FIG. 1 is a sectional view illustrating a rotary compressor according to an embodiment, andFIG. 2 is an exploded partial sectional view of the rotary compressor shown inFIG. 1 . - As shown in
FIGS. 1 and 2 , arotary compressor 10 according to the embodiment includes acase 100 defining an external appearance of the compressor, adrive device 200 to generate drive force, and acompressing device 300 to compress refrigerant gas upon receiving the drive force of thedrive device 200. Both thedrive device 200 and thecompressing device 300 are arranged inside thecylindrical case 100. - The
case 100 includes acylindrical case body 110 in which thedrive device 200 and thecompressing device 300 are mounted, anupper cap 120, a part of which is fixedly inserted into an upper end opening of thecase body 110, and alower cap 130, a part of which is fixedly inserted into a lower end opening of thecase body 110. - The
upper cap 120 is subjected to welding in a peripheral direction thereof so as to be coupled to an upper end of thecase 100, and thelower cap 130 is subjected to welding in a peripheral direction thereof so as to be coupled to a lower end of thecase 100. More particularly, the welding of the upper or lower cap is performed in a peripheral direction such that afixing weld zone 140 is created in a boundary region between the end of thecase 100 and the cap. - A
suction pipe 160 is connected to one side of a lower part of thecase 100, through which refrigerant gas is fed from anaccumulator 150 to thecompressing device 300, theaccumulator 150 functioning to filter liquid-phase refrigerant. Also, adischarge pipe 170 is connected to an upper part of thecase 100, through which the refrigerant gas compressed in thecompressing device 300 is discharged. Anoil storage space 180 is provided in a bottom region of thecase 100, in which a predetermined amount of oil is stored for lubrication and cooling of any frictional member. - The
drive device 200 includes astator 210 fixed to thecase 100, arotor 220 rotatably supported inside thestator 210, and a rotatingshaft 230 press-fitted in therotor 220. With this configuration, if power is applied to thestator 210, therotor 220 is rotated by electromagnetic force and simultaneously, the rotatingshaft 230 integrally press-fitted in therotor 220 transmits a rotating force of therotor 220 to thecompressing device 300. - The
compressing device 300 includes aneccentric part 310 formed near a lower end of the rotatingshaft 230, aroller 320 fitted around theeccentric part 310, acylinder 330 defining acompression chamber 360 in which theroller 320 is received, and anupper bearing 340 and alower bearing 350 coupled respectively to an upper end and a lower end of thecylinder 330 and adapted to hermetically seal thecompression chamber 360 while supporting therotating shaft 230. - The
cylinder 300 and the upper andlower bearings holes 300 b. Asfastening bolts 300 a are fastened through the bolt fasteningholes 300 b, the upper andlower bearings cylinder 330, thereby hermetically sealing thecompression chamber 360. - The
cylinder 330 is provided at one side thereof with asuction port 370, which is connected to thesuction pipe 160 connected to theaccumulator 150 and is used to feed refrigerant gas into thecompression chamber 360, and at the other side thereof with a discharge port (not shown) to guide the refrigerant gas compressed in thecompression chamber 360 to the outside of thecompression chamber 360. - The
upper bearing 340 has adischarge hole 380 formed in communication with the discharge port (not shown) in order to discharge the refrigerant gas guided through the discharge port (not shown) to the outside. Avalve device 390 is arranged on theupper bearing 340 at a position immediately above thedischarge hole 380 and is used to open or close thedischarge hole 380. A mixture of refrigerant and oil is introduced through thesuction port 370 and is supplied into thecompression chamber 360. Of the mixture, the oil serves to seal the interior of thecompression chamber 360. The amount of oil supplied into thecompression chamber 360 may be determined to assure appropriate mixing with the refrigerant within a range exerting no degradation in compression efficiency. -
FIG. 3 is a sectional view illustrating the compressing device and the lower cap of the rotary compressor according to the embodiment, andFIG. 4 is an enlarged perspective view of the lower bearing and the lower cap according to the embodiment. - As shown in
FIGS. 3 and 4 , in therotary compressor 10 according to the embodiment, thecompressing device 300 and thelower cap 130 are arranged close to each other, such that aweld zone 400 is created at a contact position therebetween. Theweld zone 400 may be created in a boundary region between a reinforcingprotrusion 353 extending from thecompressing device 300 to thelower cap 130 and a through-hole 130 a of thelower cap 130. - The
lower bearing 350 of thecompressing device 300 includes abearing body 351 in close contact with the lower surface of thecylinder 330, a rotatingshaft inserting portion 352 located at the center of the bearingbody 351 and extending perpendicular to thebearing body 351, through which therotating shaft 230 is inserted, and at least one reinforcingprotrusion 353 extending in an axial direction A of the bearingbody 351. - The
lower cap 130 includes abottom portion 131 arranged to close the lower end opening of thecase 100, and aperipheral portion 132 extending upward from a peripheral edge of thebottom portion 131. The boundary region between theperipheral portion 132 of thelower cap 130 and thecase 100 is subjected to welding in the peripheral direction, to create the fixingweld zone 140 for fixedly welding thelower cap 130 to thecase 100. - Also, the
weld zone 400 is created in thebottom portion 131 via the through-hole 130 a, i.e. in the boundary region between the through-hole 130 a and thelower bearing 350, thereby fixedly welding thelower bearing 350 to thelower cap 130. In this way, thecompressing device 300 is fixedly welded to thelower cap 130 located therebelow to thereby be fixed inside thecase 100. More particularly, as thecylinder 330 is fixedly welded in the axial direction A to thelower cap 130 via thelower bearing 350 that supports thecylinder 300, thecylinder 330 may be fixed inside thecase 100 without unwanted movement: - The reinforcing
protrusion 353 extends downward from thelower bearing 350 in the axial direction A, to allow thelower bearing 350 to be welded to thelower cap 130. In the embodiment as shown inFIG. 2 , three cylindrical reinforcingprotrusions 353 may be arranged on peripheral positions of a lower surface of the bearingbody 351 to extend parallel to the rotatingshaft inserting portion 352 in the axial direction A. Of course, the reinforcingprotrusions 353 are simply provided for the purpose of connecting thecompressing device 300 to thelower cap 130 for welding therebetween and therefore, the reinforcingprotrusions 353 may be replaced by various numbers and shapes of substitutions between thelower bearing 350 and thelower cap 130. - Now, an assembly method of the rotary compressor according to the embodiment will be described.
- First, the
stator 210 of thedrive device 200, thecompressing device 300, and therotor 220 of thedrive device 200 are sequentially press-fitted into thecase 100. Then, in a state wherein a gap gauge (not shown) is inserted into a gap between thestator 210 and therotor 220, a height of therotary compressor 10 is aligned. - Next, the
peripheral portion 132 of thelower cap 130 is inserted into the lower end opening of thecase 100 and is fixedly welded to thecase 100. Then, thebottom portion 131 of thelower cap 130 is welded to thecompressing device 300 in the axial direction A, to fix thecompressing device 300 inside thecase 100. - After removing the gap gauge (not shown) between the
stator 210 and therotor 220, theupper cap 120 is welded to thecase 100, completing the assembly of therotary compressor 10. - Hereinafter, operation of the rotary compressor according to the embodiment will be described.
- In the
rotary compressor 10 according to the embodiment, to fix thecompressing device 300 inside thecase 100, thecompressing device 300 is welded in the axial direction A of thecase 100, rather than being welded in a radial direction of thecase 100. Therefore, interior elements, such as, e.g., thecylinder 330 and therotating shaft 230, may be fixed at positions assuring smooth motions thereof. - Further, owing to the
weld zone 400 for fixation of thecompressing device 300 being provided in the boundary region between the compressingdevice 300 and thelower cap 130, neither thecylinder 330 nor theupper bearing 340 are thermally deformed by heat generated during welding. - Furthermore, in a state wherein the gap gauge (not shown) is inserted between the
stator 210 and therotor 220 of thedrive device 200 to assure a desired space, thelower cap 130 is first welded to thecase 100 and thereafter, is welded to thecompressing device 300. This assures the welding of thecompressing device 300 to have only minimal effect on a gap of therotary compressor 10, preventing deterioration in performance of therotary compressor 10 caused when thestator 210 androtor 220 of therotary compressor 10 are incorrectly aligned. - Next, another embodiment will be described with reference to
FIGS. 5 and 6 . The same or similar elements as those of the previous embodiment are denoted by the same reference numerals, and a description thereof will be omitted.FIG. 5 is a sectional view illustrating a rotary compressor according to another embodiment, andFIG. 6 is an enlarged perspective view illustrating a lower cap of the rotary compressor shown inFIG. 5 . - A
rotary compressor 10′ according to the present embodiment includes thecase 100 defining an external appearance of thecompressor 10′, acompressing device 300′ arranged inside thecase 100, alower cap 130′ coupled to the lower end opening of thecase 100, and aweld zone 400′ to fix thecompressing device 300 andlower cap 130′ to each other. - The
weld zone 400′ according to the present embodiment may be created in a boundary region between a supportingprotrusion 133′ extending from thelower cap 130′ to thecompressing device 300′ and thecompressing device 300′. - The
lower cap 130′ includes abottom portion 131′ arranged to close the lower end opening of thecase 100, and aperipheral portion 132′ extending upward from a peripheral edge of thebottom portion 131′. At least one supportingprotrusion 133′ may protrude upward from thebottom portion 131′ and in turn, a through-hole 130 a′ may be perforated throughout the supportingprotrusion 133′. - A certain number of supporting
protrusions 133′ may be arranged on peripheral positions of thebottom portion 131′. Of course, similar to the above-described reinforcingprotrusions 353, the number and shape of the supportingprotrusions 133′ may be determined in various manners so long as the supportingprotrusions 133′ provide satisfactory connection between the compressingdevice 300′ and thelower cap 130′. That is, the shape and size of the supportingprotrusions 133′ may be determined in such a manner that the supportingprotrusions 133′ formed on thebottom portion 131′ come into close contact with thecompressing device 300′ when thelower cap 130′ is inserted into the lower end opening of thecase 100, thereby being fixedly welded to thecompressing device 300′ via the through-holes 130 a′. - Accordingly, the
compressing device 300′ is fixedly welded to thelower cap 130′ located therebelow to thereby be fixed inside thecase 100. More particularly, as thecylinder 330 is fixedly welded in the axial direction A to thelower cap 130′ via alower bearing 350′ that supports thecylinder 300, thecylinder 330 may be fixed inside thecase 100 without unwanted movement. - As is apparent from the above description, a rotary compressor according to the embodiments is basically configured in such a manner that a compressing device is axially welded to a lower cap, preventing thermal deformation of interior elements while assuring that the interior elements are coupled at accurate positions for smooth motion thereof.
- Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (12)
1. A rotary compressor comprising:
a case defining an external appearance of the compressor;
a compressing device arranged inside the case;
a lower cap fixed to a lower end of the case; and
a weld zone to fix the compressing device and lower cap to each other.
2. The compressor according to claim 1 , wherein the weld zone is formed by at least one reinforcing protrusion extending from the compressing device to the lower cap by a predetermined length.
3. The compressor according to claim 1 , wherein the weld zone is formed by at least one supporting protrusion protruding from the lower cap to the compressing device by a predetermined length.
4. The compressor according to claim 2 , wherein the compressing device includes a cylinder defining a compression chamber for compression of refrigerant gas, and a lower bearing to support the cylinder from the lower side of the cylinder, and wherein the weld zone is formed in a boundary region between the reinforcing protrusion axially provided at the lower bearing and a through-hole perforated in the lower cap.
5. The compressor according to claim 3 , wherein the compressing device includes a cylinder defining a compression chamber for compression of refrigerant gas, and a lower bearing to support the cylinder from the lower side of the cylinder, and
wherein the weld zone is formed in a boundary region between a through-hole perforated in the supporting protrusion and the lower bearing.
6. The compressor according to claim 2 , wherein the reinforcing protrusion is provided at a peripheral position of a lower bearing to come into close contact with a bottom surface of the lower cap when the lower cap is fixed to the case.
7. The compressor according to claim 3 , wherein the supporting protrusion is provided at a peripheral position of the lower cap to come into close contact with a lower bearing when the lower cap is fixed to the case.
8. The compressor according to claim 4 or 5 , wherein the compressing device further includes an upper bearing to support the cylinder from the upper side of the cylinder.
9. The compressor according to claim 8 , further comprising:
a stator fixed to the case;
a rotor rotatably supported inside the stator; and
a rotating shaft press-fitted in the rotor.
10. A rotary compressor comprising:
a case;
a cylinder arranged inside the case;
a lower bearing closely coupled to a lower end of the cylinder; and
a lower cap fixedly welded to the lower bearing for fixing the cylinder in an axial direction.
11. The compressor according to claim 10 , wherein at least one protrusion is provided between the lower bearing and the lower cap, to fixedly weld the lower bearing to the lower cap.
12. The compressor according to claim 10 , wherein the protrusion is integrally formed with any one of the lower bearing and the lower cap.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020090000712A KR20100081463A (en) | 2009-01-06 | 2009-01-06 | Rotary compressor |
KR10-2009-712 | 2009-01-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100172756A1 true US20100172756A1 (en) | 2010-07-08 |
Family
ID=42311818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/461,587 Abandoned US20100172756A1 (en) | 2009-01-06 | 2009-08-17 | Rotary compressor |
Country Status (3)
Country | Link |
---|---|
US (1) | US20100172756A1 (en) |
KR (1) | KR20100081463A (en) |
CN (1) | CN101769254A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150125322A1 (en) * | 2013-11-07 | 2015-05-07 | Jia Huei Microsystem Refrigeration Co., Ltd | Rotary compressor |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102953996B (en) * | 2012-10-23 | 2015-05-27 | 珠海格力电器股份有限公司 | Compressor with compression pump body support member |
CN104948568B (en) * | 2014-03-31 | 2018-09-11 | 珠海凌达压缩机有限公司 | Bent axle and compressor and assembly method |
CN105090028B (en) * | 2015-09-17 | 2017-11-10 | 广东美芝制冷设备有限公司 | Rotary compressor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4216661A (en) * | 1977-12-09 | 1980-08-12 | Hitachi, Ltd. | Scroll compressor with means for end plate bias and cooled gas return to sealed compressor spaces |
JPS59101291A (en) * | 1982-11-30 | 1984-06-11 | Toshiba Corp | Formation of hermetically sealed vessel for hermetic type compressor |
US4518324A (en) * | 1982-04-09 | 1985-05-21 | Hitachi, Ltd. | Sealed type electrically operated compressor |
US5733108A (en) * | 1996-05-28 | 1998-03-31 | White Consolidated Industries, Inc. | Hermetic refrigeration compressor |
-
2009
- 2009-01-06 KR KR1020090000712A patent/KR20100081463A/en not_active Application Discontinuation
- 2009-08-17 US US12/461,587 patent/US20100172756A1/en not_active Abandoned
- 2009-09-10 CN CN200910173081A patent/CN101769254A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4216661A (en) * | 1977-12-09 | 1980-08-12 | Hitachi, Ltd. | Scroll compressor with means for end plate bias and cooled gas return to sealed compressor spaces |
US4518324A (en) * | 1982-04-09 | 1985-05-21 | Hitachi, Ltd. | Sealed type electrically operated compressor |
JPS59101291A (en) * | 1982-11-30 | 1984-06-11 | Toshiba Corp | Formation of hermetically sealed vessel for hermetic type compressor |
US5733108A (en) * | 1996-05-28 | 1998-03-31 | White Consolidated Industries, Inc. | Hermetic refrigeration compressor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150125322A1 (en) * | 2013-11-07 | 2015-05-07 | Jia Huei Microsystem Refrigeration Co., Ltd | Rotary compressor |
Also Published As
Publication number | Publication date |
---|---|
CN101769254A (en) | 2010-07-07 |
KR20100081463A (en) | 2010-07-15 |
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