US20070134108A1 - Reciprocating compressor - Google Patents
Reciprocating compressor Download PDFInfo
- Publication number
- US20070134108A1 US20070134108A1 US11/636,547 US63654706A US2007134108A1 US 20070134108 A1 US20070134108 A1 US 20070134108A1 US 63654706 A US63654706 A US 63654706A US 2007134108 A1 US2007134108 A1 US 2007134108A1
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- piston
- cylinder
- reciprocating compressor
- frame
- oil
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- 230000004044 response Effects 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims description 33
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 238000005461 lubrication Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- MROJXXOCABQVEF-UHFFFAOYSA-N Actarit Chemical compound CC(=O)NC1=CC=C(CC(O)=O)C=C1 MROJXXOCABQVEF-UHFFFAOYSA-N 0.000 description 24
- 239000003507 refrigerant Substances 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 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
- 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
- F04B35/045—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 using solenoids
Definitions
- the field relates to a compressor, and more particularly, to a reciprocating compressor.
- a compressor converts mechanical energy into compressive energy.
- Compressor may typically be categorized into a reciprocating type, a scroll type, a centrifugal type and a vane type.
- Reciprocating compressors may be further categorized into a horizontal type compressor, and a vertical type compressor.
- FIG. 1 is a cross-sectional view of an exemplary horizontal type reciprocating compressor
- FIG. 2 is a disassembled perspective view of an oil pumping unit in accordance with embodiments as broadly described herein;
- FIG. 3 illustrates an oil suction process in accordance with embodiments as broadly described herein;
- FIG. 4 illustrates an oil supply process in accordance with embodiments as broadly described herein;
- FIG. 5 is a cross-sectional view of another exemplary horizontal type reciprocating compressor incorporating an oil pumping assembly as embodied and broadly described herein;
- FIG. 6 is a cross-sectional view of another exemplary horizontal type reciprocating compressor incorporating an oil pumping assembly as embodied and broadly described herein;
- FIGS. 7-9 are exemplary installations of a compressor incorporating an oil pumping assembly as embodied and broadly described herein.
- FIG. 1 A reciprocating compressor having an oil pump in accordance with embodiments as broadly described herein is shown in FIG. 1 .
- a reciprocating compressor and particularly a horizontal type reciprocating compressor, is presented for ease of discussion, it is well understood that an oil pumping assembly as embodied and broadly described herein may be applied to other types of compressors and/or other applications which require fluid pumping as described herein.
- the exemplary reciprocating compressor includes a casing 100 , a reciprocating motor 200 provided in the casing 100 and having a linearly-reciprocating mover 230 , a compression unit 300 for compressing a fluid, such as, for example a refrigerant as a piston 320 coupled to the mover 230 reciprocate together, and a pumping unit 400 installed near the piston 320 of the compression unit 300 for pumping fluid, such as, for example, oil, contained in the casing 100 .
- a fluid such as, for example a refrigerant as a piston 320 coupled to the mover 230 reciprocate together
- a pumping unit 400 installed near the piston 320 of the compression unit 300 for pumping fluid, such as, for example, oil, contained in the casing 100 .
- the reciprocating motor 200 includes an outer stator 210 fixed to the casing 100 and having a winding coil 211 thereon, an inner stator 220 provided at an inner side of the outer stator 210 with a predetermined gap therebetween, and a mover 230 having a magnet 231 positioned in the gap between the outer stator 210 and the inner stator 220 .
- the mover 230 is fixedly coupled to an outer circumferential surface of a movable frame 232 , the moveable frame 232 having a substantially cylindrical shape so as to support a plurality of magnets 231 arranged between the outer stator 210 and the inner stator 220 .
- the movable frame 232 has two opened sides, with a rear side of the two opened sides having a portion which extends towards the center so as to be coupled to a piston 320 of the compression unit 300 by a bolt or other suitable fastener.
- a passage (not shown) for transferring a refrigerant from inside the movable frame 232 outwardly when the mover 230 reciprocates can be formed in the movable frame 232 . Since the oil pumping assembly 400 operates under an air pressure generated by the movable frame 232 , the passage may be formed large enough to generate an adequate air pressure.
- the outer stator 210 is supported by first and second fixed frames 240 and 250 , respectively, coupled to both ends of the mover 230 , and is fixedly coupled to the casing 100 .
- the inner stator 220 may be press fit to an outer circumferential surface of the front, or first fixed frame 240 .
- the first fixed frame 240 may have a disc shape having an outer diameter similar to that of the outer stator 220 .
- a cylindrical fixing protrusion 241 may protrude back from a center of the first fixed frame 240 .
- the inner stator 220 is inserted into an outer circumferential surface of the first fixed frame 240
- a cylinder 310 of the compression unit 300 is inserted into an inner circumferential surface of the first fixed frame 240 .
- An oil passage 242 for guiding oil inside the casing 100 may be formed at the first fixed frame 240 , penetrating the fixing protrusion 241 from a lower side to an upper side.
- the oil passage 242 guides oil between the cylinder 310 and the piston 320 , and then back into the casing 100 .
- a valve seat portion 243 may be connected to the oil passage 242 .
- the valve seat portion 243 may have a circular-arc shape, with an oil inlet 243 a and an oil outlet 243 b for supporting an oil valve 420 extending from an inner circumferential surface of the fixing protrusion 241 of the first fixed frame 240 .
- An oil pocket 244 in communication with the oil passage 242 may be formed between an inner circumferential surface of the fixing protrusion 241 and an outer circumferential surface of the cylinder 310 (including a front surface of the cylinder 310 ).
- the oil pocket 244 is connected to an oil passing hole 312 of the cylinder 310 so that oil can be supplied between an inner circumferential surface of the cylinder 310 and an outer circumferential surface of the piston 320 .
- the compression unit 300 includes a cylinder 310 which is inserted into and fixed to the fixing protrusion 241 of the first fixed frame 240 , the piston 320 which is coupled to the mover 230 of the reciprocating motor 200 so as to reciprocate in a compression space 311 of the cylinder 310 , a plurality of resonance springs 330 and 340 which elastically support the piston 320 , thereby causing resonance in the piston 320 , a suction valve 350 provided at an end surface of the piston 320 so as to open and close a suction channel 321 of the piston 320 thereby restricting suction of refrigerant gas, a discharge valve 360 provided at a discharge side of the cylinder 310 so as to open and close the compression space 311 thereby restricting discharge of the refrigerant gas, a valve spring 370 which elastically supports the discharge valve 360 , and a discharge cover 380 which covers a discharge side of the cylinder 310 so as to receive the discharge valve 360 and the valve spring 370 .
- the oil pocket 244 has a certain volume defined by an outer circumferential surface of the cylinder 310 and an inner circumferential surface of the fixing protrusion 241 of the first fixed frame 240 .
- the cylinder 310 is inserted into and fixed to the fixing protrusion 241 so that the oil pumping assembly 400 can be installed at the oil pocket 244 .
- the piston 320 is provided with a connection portion 322 which connects to the movable frame 232 .
- the connection portion 322 is formed as a flange which extends from a rear end of a body portion 321 .
- a suction channel 321 a is formed within the shaft of the piston 320 .
- Another passage (not shown) for passing a refrigerant inside the movable frame 232 outwardly when the piston 320 is reciprocated can be formed at the connection portion 322 . Since the oil pumping assembly 400 operates under an air pressure generated by the movable frame 232 , the passage may be formed large enough to generate an adequate air pressure.
- the first and second resonance springs 330 and 340 may be compression coil springs.
- One end of the first, or front resonance spring 330 is fixed to a front side of a connection portion 332 which is coupled to the connection portion 322 of the piston 320 , and another end of the first resonance spring 330 is fixed to the second fixed frame 250 that supports a rear side of the outer stator 210 .
- One end of the second, or rear resonance spring 340 is fixed to a rear side of the connection portion 332 , and another end of the second resonance spring 340 is fixed to an inner circumferential surface of the casing 100 .
- a fixed portion 351 (see FIG. 3 ) is formed as a cut-out at a middle portion of the suction valve 350 so as to be fixed to an end surface of the piston 320 .
- An opening/closing portion 352 (see FIG. 3 ) for opening and closing the suction channel 321 a of the piston 320 by being either bent or straightened based on a position of the fixed portion 351 is formed as a cut-out at an outer side of the fixed portion 351 .
- the discharge valve 360 may be formed of an appropriate material, such as, for example a plastic material.
- a compression surface of the discharge valve 360 is detachably coupled to an end surface of the cylinder 310 , thus allowing the valve 360 to be opened and closed.
- the outer surface of the compression surface may have a substantially semi-spherical shape.
- the valve spring 370 may be, for example, a cylindrical or a conical compression coil spring. One end of the valve spring 370 is fixed to the outer surface of the compression surface of the discharge valve 360 , and another end thereof is fixed to an inner surface of the discharge cover 380 . When the valve spring 370 has a conical shape, a relatively wider end of the valve spring 370 may be fixed to the discharge cover 380 to provide stability.
- the discharge cover 380 can form a single discharge space as shown, for example, in FIG. 1 . In alternative embodiments, the discharge cover 380 may form a plurality of discharge spaces (not shown).
- the discharge cover 380 is installed so that a discharge space portion 381 of the discharge cover 380 can be exposed outwardly through the cover insertion hole 110 of the casing 100 .
- a coupling flange portion 382 of the discharge cover 380 hermetically coupled to an outer surface of the first fixed frame 240 may be formed at an outer circumferential surface of an opened side of the discharge space portion 381 .
- the oil pumping assembly 400 may include an oil piston 410 slidably inserted into the oil pocket 244 and arranged between an outer circumferential surface of the cylinder 310 and an inner circumferential surface of the first fixed frame 240 along a motion direction of the piston 320 , an oil valve 420 for opening and closing the oil pocket 244 connected to the oil passage 242 when the oil piston 410 is reciprocated, a valve seat 430 for supporting a rear side of the oil valve 420 , first and second piston springs 440 and 450 installed along a motion direction of the oil piston 410 so as to elastically support reciprocation of the oil piston 410 , and a spring supporting plate 460 pressed-fit between an outer circumferential surface of the cylinder 310 and an inner circumferential surface of the first fixed frame 240 so as to support the second piston spring 450 .
- the oil piston 410 may have a substantially cylindrical shape with a certain thickness so that an inner circumferential surface thereof can slidably contact an outer circumferential surface of the cylinder 310 , and an outer circumferential surface thereof can slidably contact an inner circumferential surface of the fixing protrusion 241 of the first fixed frame 240 .
- the length the oil piston 410 is selected so as to allow the oil passing hole 312 of the cylinder 310 to be open to the oil pocket 244 , and not blocked by the oil piston 410 , during an oil suction stroke to allow for a smooth supply of oil.
- the oil piston 410 may be formed of a plastic material, taking into consideration friction with the cylinder 310 or the first fixed frame 240 .
- the oil valve 420 may be formed in a ring shape so as to be supported by the valve seat portion 243 of the first fixed frame 240 .
- One side of the oil valve 420 is provided with a suction valve portion 421 , and another side thereof is provided with a discharge valve portion 422 which opens and closes in a direction opposite that of the suction valve portion 421 .
- the valve seat 430 which supports a rear side of the oil valve 420 , may also be formed in a ring shape.
- a suction hole 431 for opening the suction valve portion 421 of the oil valve 420 is formed at a lower end of the valve seat 430
- a discharge hole 432 for opening the discharge valve portion 422 of the oil valve 420 is formed at an upper end of the valve seat 430 .
- the first and second piston springs 440 and 450 are installed at opposite sides of the oil piston 410 , along a motion direction of the oil piston 410 .
- the first piston spring 440 is supported by the valve seat 430
- the second piston spring 450 is supported by the spring supporting plate 460 and press fit or welded between an outer circumferential surface of the cylinder 310 and an inner circumferential surface of the first fixed frame 240 .
- a plurality of air passing holes 461 may be formed at the spring supporting plate 460 .
- the air passing holes 461 receive an inner pressure developed in the mover 230 when the piston 320 is reciprocated, and this received pressure causes the oil piston 410 to smoothly reciprocate by outwardly applying an inner pressure of the oil pocket 244 when the oil piston 410 is retreated.
- the oil pumping assembly 400 can be installed between an inner circumferential surface of the first fixed frame 240 and an outer circumferential surface of the cylinder 310 .
- the cylinder 310 may have a double structure.
- the cylinder may include a first cylinder which receives the piston, and a second cylinder inserted into an inner circumferential surface of the first fixed frame.
- the first cylinder and the second cylinder may be coupled to each other with a gap formed therebetween so as to form an oil pocket in which the oil pumping assembly may be installed.
- the compressor as shown in FIG. 1 also includes an oil guiding pipe 260 , a suction pipe SP, and a discharge pipe DP.
- a semi-hermetic space is formed in the mover 230 , and thus a refrigerant filled in the mover 230 is repeatedly contracted and expanded when the mover 230 reciprocates together with the piston 320 .
- a pressure inside the mover 230 is lowered, causing the first piston spring 440 arranged at a front side of the oil piston 410 to be restored to a rest position and the oil piston 410 to move backward along with the mover 230 and the piston 320 .
- a volume of the oil pocket 244 formed a front side of the oil piston 410 is increased, thus generating a suction force.
- the suction force causes the suction valve portion 421 of the oil valve 420 to open, thereby sucking oil from the casing 100 in through the oil passage 242 .
- the oil is dispersed between the cylinder 310 and the piston 320 through the oil passing hole 312 of the cylinder 310 to provide for lubrication between the cylinder 310 and the piston 320 .
- the second piston spring 450 extends a longer distance, between a rear side of the oil piston 410 and the connection portion 322 of the piston 320 .
- An oil pumping operation associated with this second embodiment is similar to that of the first embodiment.
- a reciprocation force of the mover 230 and the piston 320 causes the oil piston 410 to reciprocate, a pumping force of the oil piston 410 is increased and a stability of the oil piston 410 is enhanced due to the longer extension of the second piston spring 450 and its attachment to the connection portion 322 of the piston 320 .
- the oil piston 410 may be connected to the piston 320 by a cylindrical body or a rigid body, such as, for example, a plurality of bars, rather than by the second piston spring 450 . This would further increase the pumping force and the stability of the oil piston 410 .
- a damping device may also be required.
- a reciprocating compressor having an oil pumping assembly in accordance with a third embodiment will now be explained.
- front and rear sides of the oil piston 410 are supported by the first and second piston springs 440 and 450 .
- a ring-shaped collision plate 470 is interposed between the second piston spring 450 and the spring supporting plate 460 , and a collision member 323 protrudes from the connection portion 322 of the piston 320 .
- the collision member 323 applies an impact force to the second piston spring 450 via the collision plate 470 .
- the collision member 323 when the piston 320 moves forward, the collision member 323 repeatedly collides with the collision plate 470 as it passes through one of the holes 461 in the spring supporting plate 460 , thereby applying an impact force to the second piston spring 450 via the collision plate 470 .
- This impact causes the second piston spring 450 to be repeatedly contracted and expanded, with corresponding movement of the first piston spring 440 , thus causing the oil piston 410 to be reciprocated.
- the oil pumping assembly 400 reciprocates together with the mover 230 and the piston 320 , thereby further increasing a pumping force and a reliability for the oil pumping operation.
- the oil pumping assembly 400 is installed inside the compression unit 300 , a size of the compressor may be reduced and an entire structure of the compressor may be simplified.
- the oil pumping assembly for a compressor as embodied and broadly described herein has numerous applications in which compression of fluids is required, and in different types of compressors. Such applications may include, for example, air conditioning and refrigeration applications.
- FIG. 7 One such exemplary application is shown in FIG. 7 , in which a compressor 710 having an oil pumping assembly as embodied and broadly described herein is installed in a refrigerator/freezer 700 . Installation and functionality of a compressor in a refrigerator is discussed in detail in U.S. Pat. Nos. 7,082,776, 6,955,064, 7,114,345, 7,055,338 and 6,772,601, the entirety of which are incorporated herein by reference.
- FIG. 8 Another such exemplary application is shown in FIG. 8 , in which a compressor 810 having an oil pumping assembly as embodied and broadly described herein is installed in an outdoor unit of an air conditioner 800 .
- a compressor 810 having an oil pumping assembly as embodied and broadly described herein is installed in an outdoor unit of an air conditioner 800 .
- Installation and functionality of a compressor in a refrigerator is discussed in detail in U.S. Pat. Nos. 7,121,106, 6,868,681, 5,775,120, 6,374,492, 6,962,058, 6,951,628 and 5,947,373, the entirety of which are incorporated herein by reference.
- FIG. 9 Another such exemplary application is shown in FIG. 9 , in which a compressor 910 having an oil pumping assembly as embodied and broadly described herein is installed in a single, integrated air conditioning unit 900 .
- a compressor 910 having an oil pumping assembly as embodied and broadly described herein is installed in a single, integrated air conditioning unit 900 .
- Installation and functionality of a compressor in a refrigerator is discussed in detail in U.S. Pat. Nos. 7,032,404, 6,412,298, 7,036,331, 6,588,228, 6,182,460 and 5,775,123, the entirety of which are incorporated herein by reference.
- oil pumping assembly as embodied and broadly described herein is not limited to installation in compressors. Rather, the oil pumping assembly as embodied and broadly described herein may be applied in any situation in which this type of fluid pumping is required and/or advantageous.
- An object is to provide a reciprocating compressor capable of reducing a production cost by reducing a number of components, and capable of enhancing a reliability with an oil supply device.
- a reciprocating compressor including a frame for supporting a stator of a reciprocating compressor having a linearly-reciprocated mover, and having an oil passage, a cylinder fixedly coupled to the frame, a piston sidably inserted into the cylinder and reciprocating with the mover, and an oil pump installed between the frame and the cylinder so as to be connected to the oil passage of the frame and reciprocating with the piston, for generating a pumping force.
- any reference in this specification to “one embodiment,” “an exemplary,” “example embodiment,” “certain embodiment,” “alternative embodiment,” and the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment as broadly described herein.
- the appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment.
Abstract
A reciprocating compressor is provided. The compressor includes a casing, a linear reciprocating motor provided inside the casing to generate a linear driving force, a cylinder fixed with respect to the casing, and a piston which reciprocates within the cylinder based on movement of the linear motor. An oil pump provided in the compressor includes an oil piston which reciprocates in response to the reciprocating motion of the piston to provide oil to the cylinder and piston.
Description
- This application claims priority to Korean Application No. 10-2005-0122720, filed in Korea on Dec. 13, 2005, the entirety of which is incorporated herein by reference.
- 1. Field
- The field relates to a compressor, and more particularly, to a reciprocating compressor.
- 2. Background
- In general, a compressor converts mechanical energy into compressive energy. Compressor may typically be categorized into a reciprocating type, a scroll type, a centrifugal type and a vane type. Reciprocating compressors may be further categorized into a horizontal type compressor, and a vertical type compressor.
- Due to the need to provide for lubrication of various components, combined with the placement and orientation of the various components of the horizontal and vertical type reciprocating compressors, additional space is required in the casing to accommodate the oil. Further, in a horizontal type reciprocating compressor, assembly is complicated due to the number of components of the oil pump, and oil is not smoothly and continuously provided when oil viscosity is high. Likewise, the vertical orientation of the components of a vertical type reciprocating compressor makes it difficult to pump oil to the various components, thus decreases reliabilities of the compressor.
- The embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements wherein:
-
FIG. 1 is a cross-sectional view of an exemplary horizontal type reciprocating compressor; -
FIG. 2 is a disassembled perspective view of an oil pumping unit in accordance with embodiments as broadly described herein; -
FIG. 3 illustrates an oil suction process in accordance with embodiments as broadly described herein; -
FIG. 4 illustrates an oil supply process in accordance with embodiments as broadly described herein; -
FIG. 5 is a cross-sectional view of another exemplary horizontal type reciprocating compressor incorporating an oil pumping assembly as embodied and broadly described herein; -
FIG. 6 is a cross-sectional view of another exemplary horizontal type reciprocating compressor incorporating an oil pumping assembly as embodied and broadly described herein; and -
FIGS. 7-9 are exemplary installations of a compressor incorporating an oil pumping assembly as embodied and broadly described herein. - A reciprocating compressor having an oil pump in accordance with embodiments as broadly described herein is shown in
FIG. 1 . Although a reciprocating compressor, and particularly a horizontal type reciprocating compressor, is presented for ease of discussion, it is well understood that an oil pumping assembly as embodied and broadly described herein may be applied to other types of compressors and/or other applications which require fluid pumping as described herein. - Descriptions of reciprocating compressors and operation thereof can be found, for example, in U.S. Pat. Nos. 6,875,000, 6,875,001 and 6,863,506, which are subject to an obligation of assignment to the same entity, and the entirety of which is incorporated herein by reference.
- The exemplary reciprocating compressor includes a
casing 100, a reciprocatingmotor 200 provided in thecasing 100 and having a linearly-reciprocatingmover 230, acompression unit 300 for compressing a fluid, such as, for example a refrigerant as apiston 320 coupled to themover 230 reciprocate together, and apumping unit 400 installed near thepiston 320 of thecompression unit 300 for pumping fluid, such as, for example, oil, contained in thecasing 100. - The
reciprocating motor 200 includes anouter stator 210 fixed to thecasing 100 and having awinding coil 211 thereon, aninner stator 220 provided at an inner side of theouter stator 210 with a predetermined gap therebetween, and amover 230 having amagnet 231 positioned in the gap between theouter stator 210 and theinner stator 220. - The
mover 230 is fixedly coupled to an outer circumferential surface of amovable frame 232, themoveable frame 232 having a substantially cylindrical shape so as to support a plurality ofmagnets 231 arranged between theouter stator 210 and theinner stator 220. Themovable frame 232 has two opened sides, with a rear side of the two opened sides having a portion which extends towards the center so as to be coupled to apiston 320 of thecompression unit 300 by a bolt or other suitable fastener. A passage (not shown) for transferring a refrigerant from inside themovable frame 232 outwardly when themover 230 reciprocates can be formed in themovable frame 232. Since theoil pumping assembly 400 operates under an air pressure generated by themovable frame 232, the passage may be formed large enough to generate an adequate air pressure. - The
outer stator 210 is supported by first and secondfixed frames mover 230, and is fixedly coupled to thecasing 100. Theinner stator 220 may be press fit to an outer circumferential surface of the front, or first fixedframe 240. - The first
fixed frame 240 may have a disc shape having an outer diameter similar to that of theouter stator 220. Acylindrical fixing protrusion 241 may protrude back from a center of the first fixedframe 240. Theinner stator 220 is inserted into an outer circumferential surface of the firstfixed frame 240, and acylinder 310 of thecompression unit 300 is inserted into an inner circumferential surface of the firstfixed frame 240. - An
oil passage 242 for guiding oil inside thecasing 100 may be formed at the first fixedframe 240, penetrating thefixing protrusion 241 from a lower side to an upper side. Theoil passage 242 guides oil between thecylinder 310 and thepiston 320, and then back into thecasing 100. Avalve seat portion 243 may be connected to theoil passage 242. Thevalve seat portion 243 may have a circular-arc shape, with anoil inlet 243 a and anoil outlet 243 b for supporting anoil valve 420 extending from an inner circumferential surface of thefixing protrusion 241 of the first fixedframe 240. - An
oil pocket 244 in communication with theoil passage 242 may be formed between an inner circumferential surface of thefixing protrusion 241 and an outer circumferential surface of the cylinder 310 (including a front surface of the cylinder 310). Theoil pocket 244 is connected to anoil passing hole 312 of thecylinder 310 so that oil can be supplied between an inner circumferential surface of thecylinder 310 and an outer circumferential surface of thepiston 320. - The
compression unit 300 includes acylinder 310 which is inserted into and fixed to thefixing protrusion 241 of the first fixedframe 240, thepiston 320 which is coupled to themover 230 of the reciprocatingmotor 200 so as to reciprocate in acompression space 311 of thecylinder 310, a plurality ofresonance springs piston 320, thereby causing resonance in thepiston 320, asuction valve 350 provided at an end surface of thepiston 320 so as to open and close asuction channel 321 of thepiston 320 thereby restricting suction of refrigerant gas, adischarge valve 360 provided at a discharge side of thecylinder 310 so as to open and close thecompression space 311 thereby restricting discharge of the refrigerant gas, avalve spring 370 which elastically supports thedischarge valve 360, and adischarge cover 380 which covers a discharge side of thecylinder 310 so as to receive thedischarge valve 360 and thevalve spring 370. Thedischarge cover 380 is inserted into acover insertion hole 110 provided at one side of thecasing 100. - The
oil pocket 244 has a certain volume defined by an outer circumferential surface of thecylinder 310 and an inner circumferential surface of thefixing protrusion 241 of the first fixedframe 240. Thecylinder 310 is inserted into and fixed to thefixing protrusion 241 so that theoil pumping assembly 400 can be installed at theoil pocket 244. - The
piston 320 is provided with aconnection portion 322 which connects to themovable frame 232. Theconnection portion 322 is formed as a flange which extends from a rear end of abody portion 321. A suction channel 321 a is formed within the shaft of thepiston 320. Another passage (not shown) for passing a refrigerant inside themovable frame 232 outwardly when thepiston 320 is reciprocated can be formed at theconnection portion 322. Since theoil pumping assembly 400 operates under an air pressure generated by themovable frame 232, the passage may be formed large enough to generate an adequate air pressure. - The first and
second resonance springs front resonance spring 330 is fixed to a front side of aconnection portion 332 which is coupled to theconnection portion 322 of thepiston 320, and another end of thefirst resonance spring 330 is fixed to the second fixedframe 250 that supports a rear side of theouter stator 210. One end of the second, orrear resonance spring 340 is fixed to a rear side of theconnection portion 332, and another end of thesecond resonance spring 340 is fixed to an inner circumferential surface of thecasing 100. - A fixed portion 351 (see
FIG. 3 ) is formed as a cut-out at a middle portion of thesuction valve 350 so as to be fixed to an end surface of thepiston 320. An opening/closing portion 352 (seeFIG. 3 ) for opening and closing the suction channel 321 a of thepiston 320 by being either bent or straightened based on a position of the fixedportion 351 is formed as a cut-out at an outer side of thefixed portion 351. - The
discharge valve 360 may be formed of an appropriate material, such as, for example a plastic material. A compression surface of thedischarge valve 360 is detachably coupled to an end surface of thecylinder 310, thus allowing thevalve 360 to be opened and closed. The outer surface of the compression surface may have a substantially semi-spherical shape. - The
valve spring 370 may be, for example, a cylindrical or a conical compression coil spring. One end of thevalve spring 370 is fixed to the outer surface of the compression surface of thedischarge valve 360, and another end thereof is fixed to an inner surface of thedischarge cover 380. When thevalve spring 370 has a conical shape, a relatively wider end of thevalve spring 370 may be fixed to thedischarge cover 380 to provide stability. - The
discharge cover 380 can form a single discharge space as shown, for example, inFIG. 1 . In alternative embodiments, thedischarge cover 380 may form a plurality of discharge spaces (not shown). Thedischarge cover 380 is installed so that adischarge space portion 381 of thedischarge cover 380 can be exposed outwardly through thecover insertion hole 110 of thecasing 100. Acoupling flange portion 382 of thedischarge cover 380 hermetically coupled to an outer surface of the first fixedframe 240 may be formed at an outer circumferential surface of an opened side of thedischarge space portion 381. - The
oil pumping assembly 400 may include anoil piston 410 slidably inserted into theoil pocket 244 and arranged between an outer circumferential surface of thecylinder 310 and an inner circumferential surface of the first fixedframe 240 along a motion direction of thepiston 320, anoil valve 420 for opening and closing theoil pocket 244 connected to theoil passage 242 when theoil piston 410 is reciprocated, avalve seat 430 for supporting a rear side of theoil valve 420, first and second piston springs 440 and 450 installed along a motion direction of theoil piston 410 so as to elastically support reciprocation of theoil piston 410, and aspring supporting plate 460 pressed-fit between an outer circumferential surface of thecylinder 310 and an inner circumferential surface of the first fixedframe 240 so as to support thesecond piston spring 450. - The
oil piston 410 may have a substantially cylindrical shape with a certain thickness so that an inner circumferential surface thereof can slidably contact an outer circumferential surface of thecylinder 310, and an outer circumferential surface thereof can slidably contact an inner circumferential surface of the fixingprotrusion 241 of the first fixedframe 240. In certain embodiments, the length theoil piston 410 is selected so as to allow theoil passing hole 312 of thecylinder 310 to be open to theoil pocket 244, and not blocked by theoil piston 410, during an oil suction stroke to allow for a smooth supply of oil. Theoil piston 410 may be formed of a plastic material, taking into consideration friction with thecylinder 310 or the first fixedframe 240. - The
oil valve 420 may be formed in a ring shape so as to be supported by thevalve seat portion 243 of the first fixedframe 240. One side of theoil valve 420 is provided with asuction valve portion 421, and another side thereof is provided with adischarge valve portion 422 which opens and closes in a direction opposite that of thesuction valve portion 421. - The
valve seat 430, which supports a rear side of theoil valve 420, may also be formed in a ring shape. Asuction hole 431 for opening thesuction valve portion 421 of theoil valve 420 is formed at a lower end of thevalve seat 430, and adischarge hole 432 for opening thedischarge valve portion 422 of theoil valve 420 is formed at an upper end of thevalve seat 430. - The first and second piston springs 440 and 450 are installed at opposite sides of the
oil piston 410, along a motion direction of theoil piston 410. Thefirst piston spring 440 is supported by thevalve seat 430, and thesecond piston spring 450 is supported by thespring supporting plate 460 and press fit or welded between an outer circumferential surface of thecylinder 310 and an inner circumferential surface of the first fixedframe 240. - A plurality of
air passing holes 461 may be formed at thespring supporting plate 460. Theair passing holes 461 receive an inner pressure developed in themover 230 when thepiston 320 is reciprocated, and this received pressure causes theoil piston 410 to smoothly reciprocate by outwardly applying an inner pressure of theoil pocket 244 when theoil piston 410 is retreated. - The
oil pumping assembly 400 can be installed between an inner circumferential surface of the first fixedframe 240 and an outer circumferential surface of thecylinder 310. In alternative embodiments, thecylinder 310 may have a double structure. For example, the cylinder may include a first cylinder which receives the piston, and a second cylinder inserted into an inner circumferential surface of the first fixed frame. The first cylinder and the second cylinder may be coupled to each other with a gap formed therebetween so as to form an oil pocket in which the oil pumping assembly may be installed. - The compressor as shown in
FIG. 1 also includes anoil guiding pipe 260, a suction pipe SP, and a discharge pipe DP. - Operation of the exemplary reciprocating compressor having an oil pumping assembly as embodied and broadly described herein will now be explained.
- When power is supplied to the winding
coil 211 fixed to theouter stator 210 of thereciprocating motor 200, a flux is generated between theouter stator 210 and theinner stator 220. This causes themover 230 positioned between theouter stator 210 and theinner stator 220 to be continuously reciprocated due to the resonance springs 330 and 340. As thepiston 320 is coupled to themover 230, themover 230 is reciprocated in thecylinder 310, and a volume of thecompression space 311 formed between thecylinder 310 and thepiston 320 is changed. Accordingly, refrigerant gas is sucked into thecompression space 311, compressed, and then discharged. - A semi-hermetic space is formed in the
mover 230, and thus a refrigerant filled in themover 230 is repeatedly contracted and expanded when themover 230 reciprocates together with thepiston 320. As shown inFIG. 3 , when themover 230 moves backward, a pressure inside themover 230 is lowered, causing thefirst piston spring 440 arranged at a front side of theoil piston 410 to be restored to a rest position and theoil piston 410 to move backward along with themover 230 and thepiston 320. A volume of theoil pocket 244 formed a front side of theoil piston 410 is increased, thus generating a suction force. The suction force causes thesuction valve portion 421 of theoil valve 420 to open, thereby sucking oil from thecasing 100 in through theoil passage 242. The oil is dispersed between thecylinder 310 and thepiston 320 through theoil passing hole 312 of thecylinder 310 to provide for lubrication between thecylinder 310 and thepiston 320. - As shown in
FIG. 4 , when themover 230 moves forward, pressure inside themover 230 is increased and oil is moved to theoil pocket 244 through theair passing holes 461 in thespring supporting plate 460. When theoil piston 410 moves forward along with themover 230 due to the pressure, a pressure in theoil pocket 244 is increased, thus closing thesuction valve portion 421 of theoil valve 420 and opening thedischarge valve portion 422. Through the openeddischarge valve portion 422, the oil in theoil pocket 244 is returned to thecasing 100 through theoil passage 242. In this first embodiment, the oil in thecasing 100 is pumped in response to a pressure difference generated in themover 230 when themover 230 and thepiston 320 are reciprocated. - In a second embodiment shown in
FIG. 5 , thesecond piston spring 450 extends a longer distance, between a rear side of theoil piston 410 and theconnection portion 322 of thepiston 320. An oil pumping operation associated with this second embodiment is similar to that of the first embodiment. As a reciprocation force of themover 230 and thepiston 320 causes theoil piston 410 to reciprocate, a pumping force of theoil piston 410 is increased and a stability of theoil piston 410 is enhanced due to the longer extension of thesecond piston spring 450 and its attachment to theconnection portion 322 of thepiston 320. - In alternative embodiments, the
oil piston 410 may be connected to thepiston 320 by a cylindrical body or a rigid body, such as, for example, a plurality of bars, rather than by thesecond piston spring 450. This would further increase the pumping force and the stability of theoil piston 410. However in certain embodiments a damping device may also be required. - A reciprocating compressor having an oil pumping assembly in accordance with a third embodiment will now be explained. As shown in
FIG. 6 , front and rear sides of theoil piston 410 are supported by the first and second piston springs 440 and 450. A ring-shapedcollision plate 470 is interposed between thesecond piston spring 450 and thespring supporting plate 460, and acollision member 323 protrudes from theconnection portion 322 of thepiston 320. Thecollision member 323 applies an impact force to thesecond piston spring 450 via thecollision plate 470. - More specifically, when the
piston 320 moves forward, thecollision member 323 repeatedly collides with thecollision plate 470 as it passes through one of theholes 461 in thespring supporting plate 460, thereby applying an impact force to thesecond piston spring 450 via thecollision plate 470. This impact causes thesecond piston spring 450 to be repeatedly contracted and expanded, with corresponding movement of thefirst piston spring 440, thus causing theoil piston 410 to be reciprocated. - The
oil pumping assembly 400 reciprocates together with themover 230 and thepiston 320, thereby further increasing a pumping force and a reliability for the oil pumping operation. - Furthermore, since the
oil pumping assembly 400 is installed inside thecompression unit 300, a size of the compressor may be reduced and an entire structure of the compressor may be simplified. - Although an exemplary horizontal-type reciprocating compressor is presented herein, for ease of discussion, it is well understood that this can be equally applied to a vertical-type reciprocating compressor, or other type of compressor, or another application in which this type of fluid pumping is required and/or advantageous.
- More specifically, the oil pumping assembly for a compressor as embodied and broadly described herein has numerous applications in which compression of fluids is required, and in different types of compressors. Such applications may include, for example, air conditioning and refrigeration applications. One such exemplary application is shown in
FIG. 7 , in which acompressor 710 having an oil pumping assembly as embodied and broadly described herein is installed in a refrigerator/freezer 700. Installation and functionality of a compressor in a refrigerator is discussed in detail in U.S. Pat. Nos. 7,082,776, 6,955,064, 7,114,345, 7,055,338 and 6,772,601, the entirety of which are incorporated herein by reference. - Another such exemplary application is shown in
FIG. 8 , in which acompressor 810 having an oil pumping assembly as embodied and broadly described herein is installed in an outdoor unit of anair conditioner 800. Installation and functionality of a compressor in a refrigerator is discussed in detail in U.S. Pat. Nos. 7,121,106, 6,868,681, 5,775,120, 6,374,492, 6,962,058, 6,951,628 and 5,947,373, the entirety of which are incorporated herein by reference. - Another such exemplary application is shown in
FIG. 9 , in which acompressor 910 having an oil pumping assembly as embodied and broadly described herein is installed in a single, integratedair conditioning unit 900. Installation and functionality of a compressor in a refrigerator is discussed in detail in U.S. Pat. Nos. 7,032,404, 6,412,298, 7,036,331, 6,588,228, 6,182,460 and 5,775,123, the entirety of which are incorporated herein by reference. - Likewise, the oil pumping assembly as embodied and broadly described herein is not limited to installation in compressors. Rather, the oil pumping assembly as embodied and broadly described herein may be applied in any situation in which this type of fluid pumping is required and/or advantageous.
- An object is to provide a reciprocating compressor capable of reducing a production cost by reducing a number of components, and capable of enhancing a reliability with an oil supply device.
- To achieve these and other advantages and in accordance with the purpose of the embodiments as broadly described herein, there is provided a reciprocating compressor, including a frame for supporting a stator of a reciprocating compressor having a linearly-reciprocated mover, and having an oil passage, a cylinder fixedly coupled to the frame, a piston sidably inserted into the cylinder and reciprocating with the mover, and an oil pump installed between the frame and the cylinder so as to be connected to the oil passage of the frame and reciprocating with the piston, for generating a pumping force.
- Any reference in this specification to “one embodiment,” “an exemplary,” “example embodiment,” “certain embodiment,” “alternative embodiment,” and the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment as broadly described herein. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to affect such feature, structure, or characteristic in connection with other ones of the embodiments.
- Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, numerous variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
Claims (18)
1. A reciprocating compressor, comprising:
a casing;
a frame fixed within the casing and configured to support a stator coupled to a linearly-reciprocated mover;
a cylinder fixed to the frame;
a first piston coupled to the mover and configured to reciprocate within the cylinder as the mover reciprocates; and
a pump installed between the frame and the cylinder so as to be in communication with a passage formed in the frame, wherein the pump is configured to reciprocate with the piston so as to generate a pumping force.
2. The reciprocating compressor of claim 1 , wherein the pump is installed surrounding an outer circumferential surface of the cylinder.
3. The reciprocating compressor of claim 1 , wherein the pump comprises:
a second piston configured to reciprocate within a pocket defined by the cylinder and the frame, in a motion direction of the first piston;
a valve configured to open and close the passage formed in the frame when the second piston is reciprocated; and
one or more piston springs installed along a motion direction of the second piston and configured to elastically support a reciprocation of the second piston.
4. The reciprocating compressor of claim 3 , wherein the second piston has a substantially cylindrical shape such that an inner circumferential surface of the second piston contacts an outer circumferential surface of the cylinder, and an outer circumferential surface of the oil piston contacts an inner circumferential surface of the frame.
5. The reciprocating compressor of claim 3 , wherein the valve is substantially ring shaped, and wherein the valve comprises a suction valve portion at one side thereof and a discharge valve portion at another side thereof.
6. The reciprocating compressor of claim 5 , wherein the valve is supported by a piston spring.
7. The reciprocating compressor of claim 3 , wherein the piston spring is a compression coil spring.
8. The reciprocating compressor of claim 3 , wherein the pump comprises an oil pump and the second piston comprises an oil piston, and wherein the oil pump is configured to pump oil through the passage so as to provide for lubrication between the first piston and the cylinder.
9. The reciprocating compressor of claim 1 , wherein the pump is configured to reciprocate in response to air pressure developed in the mover.
10. The reciprocating compressor of claim 9 , wherein the pump comprises:
a second piston configured to reciprocate within a pocket formed between the cylinder and the frame, in a motion direction of the first piston;
a valve configured to open and close the passage;
a plurality of piston springs positioned on opposite sides of the second piston and orientated a motion direction of the second piston; and
a spring supporting plate positioned between the cylinder and the frame and having a plurality of air passing holes formed therein, wherein the spring supporting plate is configured to support one of the plurality of piston springs, and to apply an air pressure difference due to a reciprocation of the first piston to the second piston.
11. The reciprocating compressor of claim 1 , wherein the pump is coupled to the first piston so as to reciprocate as the first piston reciprocates.
12. The reciprocating compressor of claim 11 , wherein the pump comprises:
a second piston configured to reciprocate within a pocket formed between the cylinder and the frame, in a motion direction of the first piston;
a valve configured to open and close the passage formed in the frame; and
a plurality of piston springs installed on opposite sides of the second piston and oriented in a motion direction of the second piston, wherein one of the plurality of piston springs has a first end connected to the second piston and a second end connected to the first piston.
13. The reciprocating compressor of claim 11 , wherein the pump comprises:
a second piston and configured to reciprocate within a pocket formed between the cylinder and the frame, in a motion direction of the first piston;
a valve configured to open and close the passage formed in the frame;
a plurality of piston springs installed on opposite sides of the second piston and oriented in a motion direction of the second piston;
a spring supporting plate positioned between the cylinder and the frame and having at least one opening formed therein, wherein the spring supporting plate is configured to support one of the plurality of piston springs; and
a connection member configured to be slidably inserted into the at least one opening formed in the spring supporting plate, wherein the connection member is coupled to the second piston and the first piston.
14. The reciprocating compressor of claim 1 , wherein the pump performs a reciprocation in response to an impact force which occurs when a part of the first piston periodically collides with a part of the pump.
15. The reciprocating compressor of claim 14 , wherein the pump comprises:
a second piston configured to reciprocate within a pocket formed between the cylinder and the frame, in a motion direction of the first piston;
a valve configured to open and close the passage;
a plurality of piston springs installed at opposite sides of the second piston and oriented in a motion direction of the second piston;
a spring supporting plate positioned between the cylinder and the frame and having at least one opening formed therein, wherein the spring supporting plate is configured to support one of the plurality of piston springs; and
a collision member protruding from the first piston and configured to be sidably inserted into the at least one opening in the spring supporting plate so as to periodically collide with the second piston.
16. The reciprocating compressor of claim 15 , further comprising a collision plate positioned between one of the plurality of piston springs and the spring supporting plate, wherein the collision plate is configured to apply an impact force to the piston spring when the collision member collides with the collision plate.
17. The reciprocating compressor of claim 15 , wherein the collision member is a compression coil spring.
18. The reciprocating compressor of claim 15 , wherein the collision member extends from the first piston or from the second piston as a protrusion.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20050122720 | 2005-12-13 | ||
KR10-2005-0122720 | 2005-12-13 |
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US20070134108A1 true US20070134108A1 (en) | 2007-06-14 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/636,547 Abandoned US20070134108A1 (en) | 2005-12-13 | 2006-12-11 | Reciprocating compressor |
Country Status (3)
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US (1) | US20070134108A1 (en) |
CN (1) | CN1982709A (en) |
DE (1) | DE102006058821A1 (en) |
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US20100120007A1 (en) * | 2008-02-06 | 2010-05-13 | The Mitre Corporation | Fluid Percussion System and Method for Modeling Penetrating Brain Injury |
US20130115116A1 (en) * | 2010-07-09 | 2013-05-09 | Lg Electronics Inc. | Reciprocating compressor |
US20150004028A1 (en) * | 2013-06-28 | 2015-01-01 | Lg Electronics Inc. | Linear compressor |
US20150226203A1 (en) * | 2014-02-10 | 2015-08-13 | General Electric Company | Linear compressor |
US20150226201A1 (en) * | 2014-02-10 | 2015-08-13 | General Electric Company | Linear compressor |
US9677553B2 (en) | 2013-06-28 | 2017-06-13 | Lg Electronics Inc. | Linear compressor |
US9695811B2 (en) | 2013-06-28 | 2017-07-04 | Lg Electronics Inc. | Linear compressor |
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US20190178538A1 (en) * | 2016-05-03 | 2019-06-13 | Lg Electronics Inc. | Linear compressor |
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Also Published As
Publication number | Publication date |
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CN1982709A (en) | 2007-06-20 |
DE102006058821A1 (en) | 2007-06-28 |
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Owner name: LG ELECTRONICS INC., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HER, JONG-TAE;REEL/FRAME:018661/0916 Effective date: 20061211 |
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