Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
  • F04B39/127—Mounting of a cylinder block in a casing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D28/00—Shaping by press-cutting; Perforating
  • B21D28/24—Perforating, i.e. punching holes
  • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
  • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft

Definitions

• the present invention relates to a crankshaft support frame for a compressor and a method of manufacturing the same, and more particularly, to a compressor crankshaft support frame and a method of manufacturing the same that are capable of manufacturing major components using pressing and assembly processes rather than a casting process to remarkably improve strength and productivity of the frame and drastically reduce the weight of the frame.
• a refrigerator is equipped with a compressor installed in a machine room to compress low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant.
• the compressor employs a hermetic electromotive compressor.
• FIG. 1 illustrates the inner configuration of a conventional hermetic compressor which includes a hermetic housing 1 having upper and lower housings It and Ib, and a crankshaft support frame 2 disposed in the hermetic housing 1.
• a stator 3 is fixed to the crankshaft support frame 2 supported in the hermetic housing 1 by springs 2S.
• crankshaft 5 is rotatably installed through a center hole of the crankshaft support frame 2.
• a rotor 4 is integrally fixed to the crankshaft 5 to rotate together with the crankshaft 5 by electromagnetic interaction with the stator 3.
• An eccentric pin 5b eccentric to a rotational axis of the crankshaft 5 is installed at an upper end of the crankshaft 5.
• a balance weight 5c is formed opposite to the eccentric pin 5b.
• an oil passageway 5a is formed in the crankshaft 5, and oil L existing on a bottom surface of the hermetic housing 1 is guided through the oil passageway 5a to be transmitted to an upper part of the crankshaft support frame 2 and then scattered.
• a pump 5d is installed at a lower end of the crankshaft 5 to pump and then transmit the oil L through the oil passageway 5a.
• a cylinder block 6 having a compression chamber 6 1 therein is integrally formed with the crankshaft support frame 2.
• a piston 7 installed in the compression chamber 6' is connected to the eccentric pin 5b of the crankshaft 5 by a connecting rod 8.
• a valve assembly 9 is installed at an end of the cylinder block 6 to control a flow of refrigerant introduced into and discharged from the compression chamber 6'.
• crankshaft support frame 2 is generally fabricated by a casting process. Therefore, more time is required to cool the casting frame and the completed frame should be precisely re-grinded.
• a compressor crankshaft support frame includes: a frame body manufactured through pressing, and having a fastening hole formed in a center of the frame body such that an end of a compressor crankshaft is rotatably installed and a plurality of insertion holes spaced apart from a periphery of the fastening hole; a plurality of boss members fitted in the insertion holes of the frame body at its one end by fastening means; and a bearing member insertion-engaged with the periphery of the fastening hole of the frame body.
• the fastening means may include an end of the boss member having an outer diameter corresponding to an inner diameter of the insertion hole to be insertion- engaged with each other, and a caulking part formed at the end of the boss member.
• the fastening means may be a welded part for integrally fixing the fitted part of the boss member and the insertion hole.
• a periphery of the frame body may have a bent part, at least a portion of which is bent downward.
• a method of manufacturing a compressor crankshaft support frame includes the steps of: providing a mother plate in a press mold and pressing a frame body having at least one insertion hole at a periphery thereof and a fastening hole at a center thereof; inserting an upper part of a bearing member into the fastening hole of the frame body, and fastening the bearing member to the periphery of the frame body using bolt members; and closely fitting a boss member into the corresponding insertion hole of the frame body, and assembling the frame body and the boss member using a fastening means.
• the compressor crankshaft support frame of the present invention may be manufactured through pressing and assembly, rather than casting. Therefore, the frame body is manufactured by the press mold, the separately manufactured boss member and bearing member is assembled to the frame body, thereby enabling to emit the cooling of the casting and a precise abrasion process after the completion of the casting to remarkably reduce weight and working time thereof.
• FIG. 1 is a cross-sectional view of a conventional compressor for a refrigerator
• FIG. 2 is an exploded perspective view of a compressor crankshaft support frame in accordance with the present invention
• FIG. 3 is a perspective view of the compressor crankshaft support frame in accordance with the present invention.
• FIG. 4 is a cross-sectional view taken along line A-A'in FIG. 3;
• FIG. 5 is a schematic cross-sectional view of an embodiment of a fastening means in accordance with the present invention.
• FIG. 6 is a schematic cross-sectional view of another embodiment of a fastening means in accordance with the present invention.
• FIG. 7 is a schematic cross-sectional view of still another embodiment of a fastening means in accordance with the present invention.
• FIG. 8 is a flowchart illustrating a method of manufacturing a compressor crankshaft support frame in accordance with the present invention.
• FIG. 9 is a diagram schematically illustrating a process of manufacturing a bearing member in accordance with the present invention.
• a compressor crankshaft support frame in accordance with the present invention includes a frame body 100 having a fastening hole 110 at its center and at least one insertion hole 120 at its periphery, a bearing member 200 fastened to the fastening hole 110 of the frame body 100 and in which an end of a compressor crankshaft is rotatably installed, and a boss member 300 fitted in the insertion hole 120 of the frame body 100 by a fastening means.
• the frame body 100 is formed by pressing a mother plate such as a steel plate using upper and lower press molds (not shown) having a symmetrical structure.
• the fastening hole 110 and the insertion hole 120 at the center and periphery of the frame body 100 are also punched by pressing.
• a separate punching machine (not shown) may be used to precisely machine the fastening hole 110 and the insertion hole 120 of the frame body 100.
• through-holes 115 are formed around the fastening hole 110 to make bolt members 250 pass through the through-holes 115, thereby fastening the bearing member 200 to the frame body 100.
• the bearing member 200 has a center hole 210 through which the compressor crankshaft is rotatably installed, and a flange 220 integrally formed at an upper periphery thereof.
• the flange 220 has a plurality of fixing holes 222 for fixing the bearing member 200 to the frame body 100.
• Each of the fixing holes 222 has a female thread to be engaged with a lower end of the bolt member 250 through the through-hole 115 of the frame body 100 after inserting the bearing member 200 into the fastening hole 110.
• the frame body 100 has a recess 105 depressed around the periphery of the fastening hole 110 at the center thereof to secure attachment of the bearing member 200 and the frame body 100.
• the frame body 100 has bent parts 150 bent downward at both ends thereof to increase structural integrity of the frame body 100.
• the fastening means for fixing the boss member 300 to the frame body 100 may be a caulking part that an end of the boss member 300 is inserted into the insertion hole 120 of the frame body 100, or as shown in FIG. 6, may be a welded part that an end of the boss member is welded to the frame body 100.
• the fastening means may be a threaded part that an outer periphery of the boss member 300 and an inner periphery of the insertion hole 120 have male and female threaded parts, respectively.
• a method of manufacturing a compressor crankshaft support frame in accordance with the present invention includes providing a mother plate in a press mold and pressing a frame body 100 having at least one insertion hole 120 at a periphery thereof and a fastening hole 110 at a center thereof (Sl), bending both ends of the press-formed frame body 100 downward to form bent parts (S2), inserting an upper part of a bearing member 200 into the fastening hole 110 of the frame body 100, fastening the bearing member 200 to the periphery of the frame body 100 using bolt members 250 (S3), and closely fitting a boss member 300 into the corresponding insertion hole 120 of the frame body 100 and then assembling the frame body 100 and the boss member 300 using a fastening means (S4).
• the press mold employs conventional upper and lower molds, which are symmetrical to each other.
• the bearing member 200 may be manufactured by a method including machining a cylindrical member to form grooves at upper and lower surfaces thereof and a flange 220 projecting from a periphery thereof, boring the upper and lower grooves to form a center hole 210 connecting the upper and lower grooves, machining the flange 220 to form holes, and tapping the holes to form fixing holes 222 for engaging with the bolt members.
• an inner periphery of the bored center hole 210 may be precisely horned to accommodate an end of the crankshaft to be rotated therein.
• high-pressure air containing asbestos particles may be blown to precisely abrade the inner periphery of the center hole 210.
• the boss member 300 may be manufactured by a method similar to that of the bearing, except that the tapping is not performed during the flange machining.
• the compressor crankshaft support frame in accordance with the present invention is manufactured by assembling the bearing member 200 and the boss member 300 to the pressed frame body 100. Then, an upper end of the compressor crankshaft is accommodated in the center hole 210 of the bearing member 200, and the boss member 300 fixedly supports the support frame to a compressor frame.
• an eccentric pin and a balance weight are installed at an upper surface of the support frame, and a compression chamber is disposed to compress refrigerant, similar to the conventional art.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Compressor (AREA)
• Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37570631

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Citations (4)

Family Cites Families (3)

• 2005
  • 2005-06-23 KR KR1020050054367A patent/KR100676103B1/ko not_active IP Right Cessation
• 2006
  • 2006-05-01 CN CNA2006800227803A patent/CN101223361A/zh active Pending
  • 2006-05-01 JP JP2008518016A patent/JP2009503310A/ja active Pending
  • 2006-05-01 WO PCT/KR2006/001624 patent/WO2006137643A1/en active Application Filing

Patent Citations (4)

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