US20090232672A1 - Refrigerating compressor and refrigerating device using the same - Google Patents
Refrigerating compressor and refrigerating device using the same Download PDFInfo
- Publication number
- US20090232672A1 US20090232672A1 US11/573,017 US57301706A US2009232672A1 US 20090232672 A1 US20090232672 A1 US 20090232672A1 US 57301706 A US57301706 A US 57301706A US 2009232672 A1 US2009232672 A1 US 2009232672A1
- Authority
- US
- United States
- Prior art keywords
- oil
- pipe
- refrigerating compressor
- refrigerating
- insulating wall
- 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
Links
- 239000003921 oil Substances 0.000 claims description 82
- 239000003507 refrigerant Substances 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 4
- 239000002480 mineral oil Substances 0.000 claims description 4
- 235000010446 mineral oil Nutrition 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 150000004996 alkyl benzenes Chemical class 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000006260 foam Substances 0.000 description 4
- 238000005187 foaming Methods 0.000 description 3
- -1 polybutylene terephthalate Polymers 0.000 description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
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
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
- F04B39/0238—Hermetic compressors with oil distribution channels
- F04B39/0246—Hermetic compressors with oil distribution channels in the rotating shaft
- F04B39/0253—Hermetic compressors with oil distribution channels in the rotating shaft using centrifugal force for transporting the oil
-
- 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
- F04B39/0027—Pulsation and noise damping means
-
- 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
-
- 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
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
-
- 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
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/0276—Lubrication characterised by the compressor type the pump being of the reciprocating piston type, e.g. oscillating, free-piston compressors
-
- 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
- F04B39/02—Lubrication
- F04B39/0284—Constructional details, e.g. reservoirs in the casing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/13—Vibrations
Definitions
- the present invention relates to a refrigerating compressor to be used in a refrigerator, and it also relates to a refrigerating device using the same compressor.
- a conventional refrigerating compressor including a feed oil pipe dipped in oil is disclosed in Unexamined Japanese Patent Publication No. H11-303740, for example.
- the conventional compressor is described hereinafter with reference to FIGS. 5 and 6 .
- FIG. 5 shows a vertical sectional view of the conventional refrigerating compressor
- FIG. 6 shows an essential part enlarged from FIG. 5 .
- Hermetic container 1 accommodates oil 2 and motor 3 .
- Compressing unit 4 driven by motor 3 is also accommodated in container 1 under motor 3 .
- Compressing unit 4 has cylinder block 7 including cylinder 5 and bearing 6 ; and crankshaft 10 including eccentric section 8 and main shaft 9 which is supported by bearing 6 .
- Eccentric section 8 of crankshaft 10 is connected to piston 11 via connecting rod 12 .
- Piston 11 is inserted reciprocally in cylinder 5 .
- Valve plate 14 seals an opening end of cylinder 5 , and discharging valve 13 is provided to valve plate 14 on the other side of cylinder 5 .
- Valve plate 14 has suction valve 15 .
- a first end of suction muffler 17 communicates with suction valve 15 , a second end of suction muffler 17 opens into container 1 via sound deadening space 16 .
- Eccentric section 8 has feed oil pipe 18 at its lower end, and a first end of oil feed pipe 18 is press-fitted to eccentric section 8 and a second end thereof is dipped in oil 2 .
- Feed oil pipe 18 is formed of a steel pipe, and is bent to form a V-shape including an obtuse angle such that the second end dipped in oil 2 is positioned at the rotating center of main shaft 9 .
- the operation of the refrigerating compressor having the foregoing structure is described hereinafter.
- the spin of crankshaft 10 by motor 3 is transmitted to connecting rod 12 , so that piston 11 reciprocates.
- This reciprocation sucks refrigerant into suction muffler 17 , and intermittently sucks the refrigerant into cylinder 5 via suction valve 15 .
- the refrigerant flows through an outer cooling circuit (not shown) and is temporarily released into hermetic container 1 before it is sucked into suction muffler 17 .
- the refrigerant sucked into cylinder 5 is compressed by piston 11 , and pushes discharge valve 13 open, so that the refrigerant is discharged again into the outer cooling circuit.
- Oil 2 stored in container 1 is drawn through oil feed pipe 18 by centrifugal force of feed oil pipe 18 placed at the lower end of eccentric section 8 and is delivered to respective sliding sections of compressing unit 4 .
- eccentric section 8 of crankshaft 10 is vibrated by large intermittent loads applied from connection rod 12 when compressing unit 4 compresses the refrigerant, so that eccentric section 8 repeats bending deformation.
- the vibration of eccentric section 8 travels to feed oil pipe 18 .
- feed oil pipe 18 is vibrated and thus generates resonance sound.
- feed oil pipe 18 rotates in oil 2 , thereby agitating oil 2 .
- Oil 2 collides with structural elements of the compressor in container 1 , and the flow of oil 2 is thus disturbed, so that no neat eddy is formed.
- the refrigerant dissolved in oil 2 foams.
- This foam collides with feed oil pipe 18 following the disturbance of oil 2 , thereby vibrating feed oil pipe 18 and generating the resonance sound.
- This phenomenon is conspicuous particularly when the refrigerant, e.g. hydrocarbon, dissolved much amount in oil 2 is used.
- the refrigerating compressor of the present invention has a hermetic container accommodating oil; a motor accommodated in the hermetic container; a compressing unit disposed under the motor, accommodated in the container, and driven by the motor; and a vibration insulating wall.
- the compressing unit includes a crankshaft, a cylinder block, a piston, a connecting rod, and a feed oil pipe.
- the crankshaft has a main shaft and an eccentric section.
- the cylinder block has a bearing for supporting the main shaft rotatably, and a cylinder.
- the piston reciprocates in the cylinder.
- the connecting rod connects the piston to the eccentric section.
- the feed oil pipe is fixed to the eccentric section, and one of its ends is dipped into the oil.
- the vibration insulating wall is disposed inside of the container at the bottom, and surrounds the feed oil pipe with a given space in between. This structure allows isolating the resonance sound traveling from the pipe to the container, so that a refrigerating compressor with low noises is obtainable.
- FIG. 1 shows a vertical sectional view of a refrigerating compressor in accordance with an embodiment of the present invention.
- FIG. 2 shows an essential part of the compressor enlarged from FIG. 1 .
- FIG. 3 shows a lateral sectional view of the refrigerating compressor shown in FIG. 1 .
- FIG. 4 shows a refrigerating cycle of a refrigerating device employing the refrigerating compressor shown in FIG. 1 .
- FIG. 5 shows a vertical sectional view of a conventional refrigerating compressor.
- FIG. 6 shows an essential part enlarged from the conventional compressor.
- FIGS. 1 , 2 and 3 show a vertical sectional view, a sectional view illustrating an essential part enlarged, and a lateral sectional view of the refrigerating compressor in accordance with the embodiment of the present invention, respectively.
- Refrigerating compressor 50 includes hermetic container 101 , motor 106 , compressing unit 107 , and vibration insulating wall 125 .
- Hermetic container 101 stores oil 102 formed of mineral oil at its bottom, and is filled with refrigerant 103 formed of hydrocarbon such as R600a (isobutane).
- Hermetic container 101 accommodates motor 106 having stator 104 and rotor 105 , and compressing unit 107 driven by motor 106 . Compressing unit 107 is placed under motor 106 .
- Crankshaft 110 includes main shaft 109 , rigidly inserted into rotor 105 of motor 106 , and eccentric section 108 .
- Cylinder block 114 includes bearing 111 for supporting main shaft 109 rotatably, and cylinder 113 , into which piston 115 is inserted for forming compressing room 112 .
- Cylinder block 114 supports stator 104 .
- Eccentric section 108 of crankshaft 110 is connected to piston 115 by connecting rod 116 .
- Feed oil pipe 118 attaches to the lower end of eccentric section 108 such that a first end of pipe 118 is press-fitted to the lower end of eccentric section 108 and a second end is dipped in oil 102 and placed on an extension line of the rotation axis of main shaft 109 .
- Pipe 118 is formed of a steel pipe such as carbon steel pipe for machine construction, and bent at bent section 117 to form a V-shape including an obtuse angle.
- Feed oil hole 119 into which pipe 118 is press-fitted, communicates with respective sliding sections of compressing unit 107 .
- Hermetic container 101 includes lower container 120 and upper container 121 both formed by drawing hot-rolled sheet steel, for example, and lower and upper containers 120 and 121 are welded at junction 122 by electric welding.
- Lower container 120 is equipped with discharge pipe 123 and suction pipe 124 both connected to the refrigerating cycle detailed later and shown in FIG. 4 .
- Valve plate 131 seals an opening end of cylinder 113 , and discharge valve 130 is provided to valve plate 131 on the other side of cylinder 113 .
- Valve plate 131 is equipped with suction valve 132 .
- a first end of suction muffler 134 communicates with suction valve 132 , and a second end of suction muffler 134 opens into hermetic container 101 via sound deadening space 133 .
- FIG. 4 shows a refrigerating cycle of a refrigerating device including refrigerating compressor 50 .
- Refrigerating compressor 50 is coupled to heat exchanger 60 on heat absorption side (hereinafter simply referred to as “heat exchanger 60 ”), namely low pressure side of the refrigerating cycle, by suction pipe 124 shown in FIG. 3 .
- Refrigerating compressor 50 is also coupled to heat exchanger 70 on heat radiation side (hereinafter referred simply as “heat exchanger 70 ”), namely high pressure side of the refrigerating cycle, by discharge pipe 123 .
- Compressed refrigerant 103 is discharged from discharge pipe 123 , and is sent to heat exchanger 70 for radiating heat, then returns to heat exchanger 60 via expansion valve 80 for absorbing heat.
- the refrigerating device is thus formed.
- Vibration insulating wall 125 disposed in lower container 120 is described hereinafter.
- Vibration insulating wall 125 is shaped like a cup and is placed inside lower container 120 at the bottom so that it surrounds pipe 118 with a given distance in between.
- Vibration insulating wall 125 is made of the material such as metal and polybutylene terephthalate resin which is not swelled by refrigerant 103 or oil 102 .
- Vibration insulating wall 125 is sandwiched by fixing nut 127 and the bottom of lower container 120 with fixing bolt 126 .
- Fixing bolt 126 extends through the bottom of vibration insulating wall 125 and welded to lower container 120 by electric welding.
- Fixing nut 127 is screwed on bolt 126 .
- Motor 106 in operation prompts rotor 105 to rotate crankshaft 110 , thereby reciprocating piston 115 in cylinder 113 via connecting rod 116 .
- This motion allows refrigerant 103 , flowing from heat exchanger 60 shown in FIG. 4 , to pass through suction pipe 124 and be released temporarily into hermetic container 101 , then be sucked into suction muffler 134 , and be drawn intermittently into compressing room 112 in cylinder 113 via suction valve 132 .
- Refrigerant 103 flowing into compressing room 112 is compressed by piston 115 reciprocating in cylinder 113 , then pushes discharge valve 130 open, so that refrigerant 103 is discharged from discharge pipe 123 to heat exchanger 70 shown in FIG. 4 .
- Pipe 118 rotates together with crankshaft 110 .
- the first end of pipe 118 is press-fitted into eccentric section 108 roughly at the center.
- the second end of pipe 118 is dipped in oil 102 and positioned on the extension line of the rotation axis of main shaft 109 , so that the centrifugal force due to the rotation works on oil 102 in pipe 118 .
- This centrifugal force works as pumping force which delivers, via feed oil hole 119 , oil 102 inside vibration insulating wall 125 to respective sliding sections of compressing unit 107 .
- Compression load applied to piston 115 allows applying loads intermittently to eccentric section 108 , which thus repeats bending deformation. This deformation of eccentric section 108 travels as vibration to pipe 118 , thereby vibrating pipe 118 , so that pipe 118 generates resonance.
- vibration insulating wall 125 cuts off the travel of the resonance of pipe 118 to hermetic container 101 . As a result, the vibration travelling from pipe 118 to lower container 120 is attenuated, and the noise to be radiated from hermetic container 101 to the outside is suppressed to a lower level.
- Vibration insulating wall 125 is preferably made of vibration damping material such as polybutylene terephthalate resin, so that a greater amount of attenuation is obtainable and the noise radiated to the outside of hermetic container 101 can be suppressed to an excessively low level.
- communicating hole 128 having a smaller diameter than an inner diameter of pipe 118 is provided at the lower part of vibration insulating wall 125 .
- This structure allows continuous supply of oil 102 from the outside of vibration insulating wall 125 through communicating hole 128 into the inside of vibration insulating wall 125 even if the surface of oil 102 inside wall 125 lowers. As a result, supply of oil 102 is never cut off to the respective sliding sections of compressing unit 107 .
- Upper end 129 of vibration insulating wall 125 preferably extends upward and exceeds the surface of oil 102 .
- This structure allows oil 102 inside vibration insulating wall 125 to communicate with oil 102 in hermetic container 101 only through communicating hole 128 .
- Hole 128 has a diameter smaller than that of pipe 118 so that no oil shortage occurs inside vibration insulating wall 125 , so that few vibrations travel from pipe 118 to hermetic container 101 via communicating hole 128 .
- vibration insulating wall 125 effectively isolates the resonance of pipe 118 .
- the inner wall of vibration insulating wall 125 shapes like a smooth body of revolution revolving on an extension line of the rotation axis of main shaft 109 .
- This shape is free from inward protrusions, so that oil 102 inside vibration insulating wall 125 rotates in a conical shape without disturbance following the rotation of pipe 118 .
- drawing a smooth circle the bubbles of refrigerant 103 in oil 102 approach to the tip of pipe 118 , so that collisions between the bubbles and the inside or outside wall of pipe 118 decrease drastically. Oil 102 including the bubbles is thus smoothly drawn into pipe 118 , and the resonance of pipe 118 decreases also drastically.
- Refrigerant 103 such as hydrocarbon and oil 102 such as mineral oil or alkyl benzene are mutually soluble with each other, so that refrigerant 103 dissolved in oil 102 during the halt of refrigerating compressor 50 abruptly starts foaming when refrigerating compressor 50 starts operating. After this abrupt foaming is finished, refrigerant 103 in oil 102 more or less foams successively during the operation of refrigerating compressor 50 .
- refrigerant 103 easy to foam is combined with oil 102 .
- a noise level of hermetic container 101 due to resonance can be lowered even if the resonance of pipe 118 frequently occurs due to the collision between the bubbles and pipe 118 with this combination.
- vibration insulating wall 125 formed of the vibration damping member, efficiently damps the vibration travelling in oil 102 , thereby reducing drastically the vibration transmitted to the outside of vibration insulating wall 125 .
- pipe 118 made of a steel pipe such as a carbon steel pipe for machine construction is just bent at bent section 117 to form a V-shape including an obtuse angle, so that pipe 118 is obtainable at a high productivity.
- Pipe 118 violently agitates oil 102 , which thus splashes from the oil surface, so that the oil drops scatter. This particular case is described hereinafter.
- the centrifugal force works on oil drops attached to the outer wall of pipe 118 .
- This centrifugal force sometimes produces oil drops splashed and separated from the oil surface of oil 102 .
- the oil drop in general, splashes along the outer rim of pipe 118 and collides with hermetic container 101 or compressing unit 107 , thereby causing noises.
- Upper end 129 of vibration insulating wall 125 preferably extends upward and exceeds bent section 117 of pipe 118 . This structure allows the inner face of vibration insulating wall 125 to catch the oil drops splashed by pipe 118 , so that the scatter of oil drops is prevented from colliding with hermetic container 101 or compressing unit 107 . As a result, noises can be prevented.
- vibration insulating wall 125 made of resin such as polybutylene terephthalate resin is used; however, vibration damping steel plate or rubber such as nitrile-butadiene rubber can be used instead of the resin, and these materials produce an advantage similar to what is discussed above.
- Cold-rolled sheet steel which is inexpensive and highly formable, can be used as the material of vibration insulating wall 125 with an advantage similar to the foregoing one.
- a refrigerating compressor of the present invention is useful for a refrigerating device to be used in a home-use refrigerator which requires quiet operation, and it is applicable to business-use refrigerators to be used in hotels or a medical care industry.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compressor (AREA)
Abstract
Description
- The present invention relates to a refrigerating compressor to be used in a refrigerator, and it also relates to a refrigerating device using the same compressor.
- A conventional refrigerating compressor including a feed oil pipe dipped in oil is disclosed in Unexamined Japanese Patent Publication No. H11-303740, for example. The conventional compressor is described hereinafter with reference to
FIGS. 5 and 6 . -
FIG. 5 shows a vertical sectional view of the conventional refrigerating compressor, andFIG. 6 shows an essential part enlarged fromFIG. 5 .Hermetic container 1 accommodatesoil 2 andmotor 3. Compressingunit 4 driven bymotor 3 is also accommodated incontainer 1 undermotor 3. - Compressing
unit 4 hascylinder block 7 includingcylinder 5 and bearing 6; andcrankshaft 10 includingeccentric section 8 andmain shaft 9 which is supported by bearing 6.Eccentric section 8 ofcrankshaft 10 is connected topiston 11 via connectingrod 12. Piston 11 is inserted reciprocally incylinder 5. -
Valve plate 14 seals an opening end ofcylinder 5, and dischargingvalve 13 is provided tovalve plate 14 on the other side ofcylinder 5. Valveplate 14 hassuction valve 15. A first end ofsuction muffler 17 communicates withsuction valve 15, a second end ofsuction muffler 17 opens intocontainer 1 viasound deadening space 16. -
Eccentric section 8 has feedoil pipe 18 at its lower end, and a first end ofoil feed pipe 18 is press-fitted toeccentric section 8 and a second end thereof is dipped inoil 2. Feedoil pipe 18 is formed of a steel pipe, and is bent to form a V-shape including an obtuse angle such that the second end dipped inoil 2 is positioned at the rotating center ofmain shaft 9. - The operation of the refrigerating compressor having the foregoing structure is described hereinafter. The spin of
crankshaft 10 bymotor 3 is transmitted to connectingrod 12, so thatpiston 11 reciprocates. This reciprocation sucks refrigerant intosuction muffler 17, and intermittently sucks the refrigerant intocylinder 5 viasuction valve 15. The refrigerant flows through an outer cooling circuit (not shown) and is temporarily released intohermetic container 1 before it is sucked intosuction muffler 17. The refrigerant sucked intocylinder 5 is compressed bypiston 11, and pushesdischarge valve 13 open, so that the refrigerant is discharged again into the outer cooling circuit.Oil 2 stored incontainer 1 is drawn throughoil feed pipe 18 by centrifugal force offeed oil pipe 18 placed at the lower end ofeccentric section 8 and is delivered to respective sliding sections of compressingunit 4. - In the foregoing structure,
eccentric section 8 ofcrankshaft 10 is vibrated by large intermittent loads applied fromconnection rod 12 when compressingunit 4 compresses the refrigerant, so thateccentric section 8 repeats bending deformation. The vibration ofeccentric section 8 travels to feedoil pipe 18. Then feedoil pipe 18 is vibrated and thus generates resonance sound. - In addition, feed
oil pipe 18 rotates inoil 2, thereby agitatingoil 2.Oil 2 collides with structural elements of the compressor incontainer 1, and the flow ofoil 2 is thus disturbed, so that no neat eddy is formed. In this status, the refrigerant dissolved inoil 2 foams. This foam collides withfeed oil pipe 18 following the disturbance ofoil 2, thereby vibratingfeed oil pipe 18 and generating the resonance sound. This phenomenon is conspicuous particularly when the refrigerant, e.g. hydrocarbon, dissolved much amount inoil 2 is used. - The vibration due to the resonance of
feed oil pipe 18 travels tohermetic container 1 viaoil 2, and radiates to the outside ofcontainer 1 as noises, so that the refrigerating compressor becomes noisy. - The refrigerating compressor of the present invention has a hermetic container accommodating oil; a motor accommodated in the hermetic container; a compressing unit disposed under the motor, accommodated in the container, and driven by the motor; and a vibration insulating wall. The compressing unit includes a crankshaft, a cylinder block, a piston, a connecting rod, and a feed oil pipe. The crankshaft has a main shaft and an eccentric section. The cylinder block has a bearing for supporting the main shaft rotatably, and a cylinder. The piston reciprocates in the cylinder. The connecting rod connects the piston to the eccentric section. The feed oil pipe is fixed to the eccentric section, and one of its ends is dipped into the oil. The vibration insulating wall is disposed inside of the container at the bottom, and surrounds the feed oil pipe with a given space in between. This structure allows isolating the resonance sound traveling from the pipe to the container, so that a refrigerating compressor with low noises is obtainable.
-
FIG. 1 shows a vertical sectional view of a refrigerating compressor in accordance with an embodiment of the present invention. -
FIG. 2 shows an essential part of the compressor enlarged fromFIG. 1 . -
FIG. 3 shows a lateral sectional view of the refrigerating compressor shown inFIG. 1 . -
FIG. 4 shows a refrigerating cycle of a refrigerating device employing the refrigerating compressor shown inFIG. 1 . -
FIG. 5 shows a vertical sectional view of a conventional refrigerating compressor. -
FIG. 6 shows an essential part enlarged from the conventional compressor. - An exemplary embodiment of the present invention is demonstrated hereinafter with reference to the accompanying drawings. This embodiment does not limit the invention.
-
FIGS. 1 , 2 and 3 show a vertical sectional view, a sectional view illustrating an essential part enlarged, and a lateral sectional view of the refrigerating compressor in accordance with the embodiment of the present invention, respectively. Refrigeratingcompressor 50 includeshermetic container 101,motor 106,compressing unit 107, and vibrationinsulating wall 125. -
Hermetic container 101stores oil 102 formed of mineral oil at its bottom, and is filled withrefrigerant 103 formed of hydrocarbon such as R600a (isobutane).Hermetic container 101 accommodatesmotor 106 havingstator 104 androtor 105, and compressingunit 107 driven bymotor 106.Compressing unit 107 is placed undermotor 106. - Next, a structure of compressing
unit 107 is described hereinafter.Crankshaft 110 includesmain shaft 109, rigidly inserted intorotor 105 ofmotor 106, andeccentric section 108.Cylinder block 114 includes bearing 111 for supportingmain shaft 109 rotatably, andcylinder 113, into whichpiston 115 is inserted for forming compressingroom 112.Cylinder block 114 supportsstator 104.Eccentric section 108 ofcrankshaft 110 is connected topiston 115 by connectingrod 116. - Feed oil pipe 118 (hereinafter referred simply as “
pipe 118”) attaches to the lower end ofeccentric section 108 such that a first end ofpipe 118 is press-fitted to the lower end ofeccentric section 108 and a second end is dipped inoil 102 and placed on an extension line of the rotation axis ofmain shaft 109. Pipe 118 is formed of a steel pipe such as carbon steel pipe for machine construction, and bent atbent section 117 to form a V-shape including an obtuse angle. Feedoil hole 119, into whichpipe 118 is press-fitted, communicates with respective sliding sections of compressingunit 107. - A structure of
hermetic container 101 is described hereinafter.Hermetic container 101 includeslower container 120 andupper container 121 both formed by drawing hot-rolled sheet steel, for example, and lower andupper containers junction 122 by electric welding.Lower container 120 is equipped withdischarge pipe 123 andsuction pipe 124 both connected to the refrigerating cycle detailed later and shown inFIG. 4 . -
Valve plate 131 seals an opening end ofcylinder 113, anddischarge valve 130 is provided tovalve plate 131 on the other side ofcylinder 113.Valve plate 131 is equipped withsuction valve 132. A first end ofsuction muffler 134 communicates withsuction valve 132, and a second end ofsuction muffler 134 opens intohermetic container 101 viasound deadening space 133. -
FIG. 4 shows a refrigerating cycle of a refrigerating device including refrigeratingcompressor 50. Refrigeratingcompressor 50 is coupled toheat exchanger 60 on heat absorption side (hereinafter simply referred to as “heat exchanger 60”), namely low pressure side of the refrigerating cycle, bysuction pipe 124 shown inFIG. 3 . Refrigeratingcompressor 50 is also coupled toheat exchanger 70 on heat radiation side (hereinafter referred simply as “heat exchanger 70”), namely high pressure side of the refrigerating cycle, bydischarge pipe 123.Compressed refrigerant 103 is discharged fromdischarge pipe 123, and is sent toheat exchanger 70 for radiating heat, then returns toheat exchanger 60 viaexpansion valve 80 for absorbing heat. The refrigerating device is thus formed. - Next,
vibration insulating wall 125 disposed inlower container 120 is described hereinafter.Vibration insulating wall 125 is shaped like a cup and is placed insidelower container 120 at the bottom so that it surroundspipe 118 with a given distance in between.Vibration insulating wall 125 is made of the material such as metal and polybutylene terephthalate resin which is not swelled byrefrigerant 103 oroil 102. -
Vibration insulating wall 125 is sandwiched by fixingnut 127 and the bottom oflower container 120 with fixingbolt 126. Fixingbolt 126 extends through the bottom ofvibration insulating wall 125 and welded tolower container 120 by electric welding. Fixingnut 127 is screwed onbolt 126. - The operation of the refrigerating compressor having the foregoing structure is demonstrated hereinafter.
Motor 106 in operation promptsrotor 105 to rotatecrankshaft 110, thereby reciprocatingpiston 115 incylinder 113 via connectingrod 116. This motion allows refrigerant 103, flowing fromheat exchanger 60 shown inFIG. 4 , to pass throughsuction pipe 124 and be released temporarily intohermetic container 101, then be sucked intosuction muffler 134, and be drawn intermittently intocompressing room 112 incylinder 113 viasuction valve 132.Refrigerant 103 flowing intocompressing room 112 is compressed bypiston 115 reciprocating incylinder 113, then pushesdischarge valve 130 open, so that refrigerant 103 is discharged fromdischarge pipe 123 toheat exchanger 70 shown inFIG. 4 . -
Pipe 118 rotates together withcrankshaft 110. The first end ofpipe 118 is press-fitted intoeccentric section 108 roughly at the center. The second end ofpipe 118 is dipped inoil 102 and positioned on the extension line of the rotation axis ofmain shaft 109, so that the centrifugal force due to the rotation works onoil 102 inpipe 118. This centrifugal force works as pumping force which delivers, viafeed oil hole 119,oil 102 insidevibration insulating wall 125 to respective sliding sections of compressingunit 107. - Compression load applied to
piston 115 allows applying loads intermittently toeccentric section 108, which thus repeats bending deformation. This deformation ofeccentric section 108 travels as vibration topipe 118, thereby vibratingpipe 118, so thatpipe 118 generates resonance. However, in refrigeratingcompressor 50,vibration insulating wall 125 cuts off the travel of the resonance ofpipe 118 tohermetic container 101. As a result, the vibration travelling frompipe 118 tolower container 120 is attenuated, and the noise to be radiated fromhermetic container 101 to the outside is suppressed to a lower level. -
Vibration insulating wall 125 is preferably made of vibration damping material such as polybutylene terephthalate resin, so that a greater amount of attenuation is obtainable and the noise radiated to the outside ofhermetic container 101 can be suppressed to an excessively low level. - It is preferable that communicating
hole 128 having a smaller diameter than an inner diameter ofpipe 118 is provided at the lower part ofvibration insulating wall 125. This structure allows continuous supply ofoil 102 from the outside ofvibration insulating wall 125 through communicatinghole 128 into the inside ofvibration insulating wall 125 even if the surface ofoil 102 insidewall 125 lowers. As a result, supply ofoil 102 is never cut off to the respective sliding sections of compressingunit 107. -
Upper end 129 ofvibration insulating wall 125 preferably extends upward and exceeds the surface ofoil 102. This structure allowsoil 102 insidevibration insulating wall 125 to communicate withoil 102 inhermetic container 101 only through communicatinghole 128.Hole 128 has a diameter smaller than that ofpipe 118 so that no oil shortage occurs insidevibration insulating wall 125, so that few vibrations travel frompipe 118 tohermetic container 101 via communicatinghole 128. As a result,vibration insulating wall 125 effectively isolates the resonance ofpipe 118. - Next, the situation where bubbles of
refrigerant 103 collide withpipe 118, is demonstrated hereinafter. When refrigeratingcompressor 50 starts operating, the inside ofhermetic container 101 is decompressed. As a result, refrigerant 103 dissolved inoil 102 during the halt of refrigeratingcompressor 50 starts foaming. The bubble ofrefrigerant 103 generated at this time draws an eddy-like path following the rotation ofpipe 118, and the bubbles are drawn to the tip ofpipe 118 together withoil 102. At this time, when the bubbles is drawn together withoil 102 disturbed aroundpipe 118 to the tip ofpipe 118, the bubbles collide with the inner and outer walls ofpipe 118, so thatpipe 118 is greatly vibrated. - Considering the status discussed above, it is preferable that the inner wall of
vibration insulating wall 125 shapes like a smooth body of revolution revolving on an extension line of the rotation axis ofmain shaft 109. This shape is free from inward protrusions, so thatoil 102 insidevibration insulating wall 125 rotates in a conical shape without disturbance following the rotation ofpipe 118. As a result, drawing a smooth circle, the bubbles ofrefrigerant 103 inoil 102 approach to the tip ofpipe 118, so that collisions between the bubbles and the inside or outside wall ofpipe 118 decrease drastically.Oil 102 including the bubbles is thus smoothly drawn intopipe 118, and the resonance ofpipe 118 decreases also drastically. -
Refrigerant 103 such as hydrocarbon andoil 102 such as mineral oil or alkyl benzene are mutually soluble with each other, so that refrigerant 103 dissolved inoil 102 during the halt of refrigeratingcompressor 50 abruptly starts foaming when refrigeratingcompressor 50 starts operating. After this abrupt foaming is finished, refrigerant 103 inoil 102 more or less foams successively during the operation of refrigeratingcompressor 50. - In this embodiment, refrigerant 103 easy to foam is combined with
oil 102. A noise level ofhermetic container 101 due to resonance can be lowered even if the resonance ofpipe 118 frequently occurs due to the collision between the bubbles andpipe 118 with this combination. This is becausevibration insulating wall 125, formed of the vibration damping member, efficiently damps the vibration travelling inoil 102, thereby reducing drastically the vibration transmitted to the outside ofvibration insulating wall 125. As discussed above, even use ofpipe 118, weakening the noise of refrigeratingcompressor 50 to an excessively low level is allowed.Pipe 118 made of a steel pipe such as a carbon steel pipe for machine construction is just bent atbent section 117 to form a V-shape including an obtuse angle, so thatpipe 118 is obtainable at a high productivity. -
Pipe 118 violently agitatesoil 102, which thus splashes from the oil surface, so that the oil drops scatter. This particular case is described hereinafter. Whenpipe 118 rotates inoil 102 during the operation of refrigeratingcompressor 50, the centrifugal force works on oil drops attached to the outer wall ofpipe 118. This centrifugal force sometimes produces oil drops splashed and separated from the oil surface ofoil 102. The oil drop, in general, splashes along the outer rim ofpipe 118 and collides withhermetic container 101 or compressingunit 107, thereby causing noises. -
Upper end 129 ofvibration insulating wall 125 preferably extends upward and exceedsbent section 117 ofpipe 118. This structure allows the inner face ofvibration insulating wall 125 to catch the oil drops splashed bypipe 118, so that the scatter of oil drops is prevented from colliding withhermetic container 101 or compressingunit 107. As a result, noises can be prevented. - In this embodiment,
vibration insulating wall 125 made of resin such as polybutylene terephthalate resin is used; however, vibration damping steel plate or rubber such as nitrile-butadiene rubber can be used instead of the resin, and these materials produce an advantage similar to what is discussed above. Cold-rolled sheet steel, which is inexpensive and highly formable, can be used as the material ofvibration insulating wall 125 with an advantage similar to the foregoing one. - A refrigerating compressor of the present invention is useful for a refrigerating device to be used in a home-use refrigerator which requires quiet operation, and it is applicable to business-use refrigerators to be used in hotels or a medical care industry.
- 1 hermetic container
- 2 oil
- 3 motor
- 4 compressing unit
- 5 cylinder
- 6 bearing
- 7 cylinder block
- 8 eccentric section
- 9 main shaft
- 10 crankshaft
- 11 piston
- 12 connecting rod
- 13 discharge valve
- 14 valve plate
- 15 suction valve
- 16 sound deadening space
- 17 suction muffler
- 18 feed oil pipe
- 50 refrigerating compressor
- 60 heat exchanger on heat absorption side
- 70 heat exchanger on heat radiation side
- 80 expansion valve
- 101 hermetic container
- 102 oil
- 103 refrigerant
- 104 stator
- 105 rotor
- 106 motor
- 107 compressing unit
- 108 eccentric section
- 109 main shaft
- 110 crankshaft
- 111 bearing
- 112 compressing room
- 113 cylinder
- 114 cylinder block
- 115 piston
- 116 connecting rod
- 117 bent section
- 118 feed oil pipe
- 119 feed oil hole
- 120 lower container
- 121 upper container
- 122 junction
- 123 discharge pipe
- 124 suction pipe
- 125 vibration insulating wall
- 126 fixing bolt
- 127 fixing nut
- 128 communicating hole
- 129 upper end
- 130 discharge valve
- 131 valve plate
- 132 suction valve
- 133 sound deadening space
- 134 suction muffler
Claims (10)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005198325A JP4774837B2 (en) | 2005-07-07 | 2005-07-07 | Refrigerant compressor |
JP2005-198325 | 2005-07-07 | ||
PCT/JP2006/313621 WO2007007692A1 (en) | 2005-07-07 | 2006-07-03 | Refrigerating compressor and refrigerating device using the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090232672A1 true US20090232672A1 (en) | 2009-09-17 |
Family
ID=37232942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/573,017 Abandoned US20090232672A1 (en) | 2005-07-07 | 2006-07-03 | Refrigerating compressor and refrigerating device using the same |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090232672A1 (en) |
EP (1) | EP1763635A1 (en) |
JP (1) | JP4774837B2 (en) |
KR (1) | KR100832211B1 (en) |
CN (2) | CN100516517C (en) |
WO (1) | WO2007007692A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2433005A1 (en) * | 2009-05-22 | 2012-03-28 | Arçelik Anonim Sirketi | Hermetic compressor having increased lubrication effectiveness |
WO2013127099A1 (en) * | 2012-02-28 | 2013-09-06 | 智晖有限公司 | Method for charge balancing and load control in parallel battery packs |
CN111852825B (en) * | 2020-07-30 | 2022-05-24 | 加西贝拉压缩机有限公司 | Limiting structure of oil suction pipe of compressor |
CN115388584B (en) * | 2022-10-24 | 2023-01-17 | 冰轮环境技术股份有限公司 | Self-adaptive liquid supply device and cascade refrigeration system with same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2198258A (en) * | 1937-01-21 | 1940-04-23 | Crosley Corp | Refrigeration system |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5127766B2 (en) * | 1971-12-25 | 1976-08-14 | ||
JPS4938204A (en) * | 1972-08-15 | 1974-04-09 | ||
JPS5576814A (en) * | 1978-12-06 | 1980-06-10 | Green Cross Corp:The | Preservative solution for organ transplant |
JPS57107984A (en) * | 1980-12-26 | 1982-07-05 | Ishikawajima Harima Heavy Ind Co Ltd | Water taking method for ship |
US5306126A (en) * | 1991-03-27 | 1994-04-26 | Tecumseh Products Company | Scroll compressor lubrication control |
JPH05202853A (en) * | 1992-01-30 | 1993-08-10 | Sanyo Electric Co Ltd | Oil feeding device for closed type compressor |
US5266015A (en) * | 1992-02-13 | 1993-11-30 | Tecumseh Products Company | Compressor suction and discharge valve assembly |
JPH102282A (en) * | 1996-06-14 | 1998-01-06 | Matsushita Refrig Co Ltd | Closed compressor |
US6276901B1 (en) * | 1999-12-13 | 2001-08-21 | Tecumseh Products Company | Combination sight glass and sump oil level sensor for a hermetic compressor |
JP2002221180A (en) * | 2001-01-26 | 2002-08-09 | Sanyo Electric Co Ltd | Rotary compressor |
JP4552388B2 (en) * | 2003-05-28 | 2010-09-29 | パナソニック株式会社 | Compressor operation control method, control apparatus, refrigerant compressor, and refrigeration apparatus |
JP2005113865A (en) * | 2003-10-10 | 2005-04-28 | Matsushita Refrig Co Ltd | Refrigerant compressor |
JP2005133634A (en) * | 2003-10-30 | 2005-05-26 | Matsushita Refrig Co Ltd | Refrigerant compressor |
-
2005
- 2005-07-07 JP JP2005198325A patent/JP4774837B2/en not_active Expired - Fee Related
-
2006
- 2006-07-03 WO PCT/JP2006/313621 patent/WO2007007692A1/en active Application Filing
- 2006-07-03 KR KR1020077003646A patent/KR100832211B1/en not_active IP Right Cessation
- 2006-07-03 EP EP06780896A patent/EP1763635A1/en not_active Withdrawn
- 2006-07-03 US US11/573,017 patent/US20090232672A1/en not_active Abandoned
- 2006-07-05 CN CNB2006101054381A patent/CN100516517C/en not_active Expired - Fee Related
- 2006-07-05 CN CNU2006201221500U patent/CN2934650Y/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2198258A (en) * | 1937-01-21 | 1940-04-23 | Crosley Corp | Refrigeration system |
Also Published As
Publication number | Publication date |
---|---|
CN1896513A (en) | 2007-01-17 |
KR20070065304A (en) | 2007-06-22 |
EP1763635A1 (en) | 2007-03-21 |
WO2007007692A1 (en) | 2007-01-18 |
KR100832211B1 (en) | 2008-05-23 |
CN100516517C (en) | 2009-07-22 |
JP4774837B2 (en) | 2011-09-14 |
CN2934650Y (en) | 2007-08-15 |
JP2007016671A (en) | 2007-01-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20100239438A1 (en) | Hermetic compressor | |
US20090232672A1 (en) | Refrigerating compressor and refrigerating device using the same | |
US20100031696A1 (en) | Refrigerating compressor and refrigerating device using the same | |
EP1382850B1 (en) | Hermetic motor-driven compressor | |
US6527086B2 (en) | Oil supply device for closed reciprocating compressor | |
EP3211235B1 (en) | Hermetic compressor and refrigeration device using same | |
JP3677434B2 (en) | Hermetic electric compressor | |
US8133038B2 (en) | Hermetic compressor | |
JP2008088958A (en) | Refrigerant compressor | |
US10544782B2 (en) | Hermetic compressor and refrigeration device | |
US20040213682A1 (en) | Hermetic compressor | |
KR101366566B1 (en) | A hermetic type compressor | |
KR20160136754A (en) | Motor Bracket Structure of Hermetic Compressor | |
KR100414124B1 (en) | Device for reducing impact force of reciprocating compressor | |
JP2001059477A (en) | Hermetic motor-driven compressor | |
JP2020002853A (en) | Hermetic type compressor and freezer having the same | |
WO2000077401A1 (en) | Motor-driven hermetic compressor | |
JP2005054580A (en) | Closed type motor-operated compressor | |
KR20090001057A (en) | A hermetic type compressor | |
KR20000032599A (en) | Accumulator of rotary compressor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OTA, TOSHIHIKO;REEL/FRAME:019396/0293 Effective date: 20070105 |
|
AS | Assignment |
Owner name: PANASONIC CORPORATION,JAPAN Free format text: CHANGE OF NAME;ASSIGNOR:MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;REEL/FRAME:021818/0725 Effective date: 20081001 Owner name: PANASONIC CORPORATION, JAPAN Free format text: CHANGE OF NAME;ASSIGNOR:MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;REEL/FRAME:021818/0725 Effective date: 20081001 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |