US20130058816A1 - Reciprocating compressor - Google Patents

Reciprocating compressor Download PDF

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Publication number
US20130058816A1
US20130058816A1 US13/602,951 US201213602951A US2013058816A1 US 20130058816 A1 US20130058816 A1 US 20130058816A1 US 201213602951 A US201213602951 A US 201213602951A US 2013058816 A1 US2013058816 A1 US 2013058816A1
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United States
Prior art keywords
gas
cylinder
piston
reciprocating
reciprocating compressor
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
Application number
US13/602,951
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English (en)
Inventor
Donghan KIM
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LG Electronics Inc
Original Assignee
LG Electronics Inc
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Filing date
Publication date
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Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, DONGHAN
Publication of US20130058816A1 publication Critical patent/US20130058816A1/en
Abandoned legal-status Critical Current

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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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • 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
    • F04B39/0005—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 adaptations of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/122—Cylinder block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/123—Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/125—Cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/126—Cylinder liners
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system

Definitions

  • the present disclosure relates to a reciprocating compressor, and more particularly, to a reciprocating compressor with a gas bearing.
  • a reciprocating compressor serves to intake, compress, and discharge a refrigerant as a piston linearly reciprocates within a cylinder.
  • the reciprocating compressor may be classified into a connection type reciprocating compressor or a vibration type reciprocating compressor according to the method employed to drive the piston.
  • connection type reciprocating compressor the piston is connected to a rotating shaft associated with a rotation motor by a connection rod, which causes the piston to reciprocate within the cylinder, thereby compressing the refrigerant.
  • the piston is connected to a mover associated with a reciprocating motor, which vibrates the piston while the piston reciprocates within the cylinder, thereby compressing the refrigerant.
  • the present invention relates to the vibration type reciprocating compressor, and the term “reciprocating compressor” will hereinafter refer to the vibration type reciprocating compressor.
  • a portion between the cylinder and the piston, being hermetically sealed, has to be properly lubricated.
  • a reciprocating compressor which seals and lubricates a portion between the cylinder and the piston by supplying a lubricant such as oil between the cylinder and the piston and forming an oil film.
  • the supplying of the lubricant requires an oil supply apparatus, and an oil shortage may occur depending on operation conditions, thereby degrading compressor performance.
  • the compressor size needs to be increased because a space for receiving a certain amount of oil is required, and the installation direction of the compressor is limited because the entrance of the oil supply apparatus should always be kept immersed in oil.
  • FIG. 1 there has been conventionally known a technique of forming a gas bearing between the piston 1 and the cylinder 2 by bypassing a part of compressed gas between the piston 1 and the cylinder 2 .
  • a plurality of gas flow paths 2 a with a small diameter are formed in the cylinder 2 , or a sintered porous material member (not shown) is provided on an inner circumferential surface of the cylinder 2 .
  • This technique can simplify a lubrication structure of the compressor because it requires no oil supply apparatus, unlike the oil-lubricated type for supplying oil between the piston 1 and the cylinder 2 , and can maintain constant compressor performance by preventing an oil shortage depending on operating conditions.
  • this technique has the advantage that the compressor can be smaller in size and the installation direction of the compressor can be freely designed because no space for receiving oil is required in the casing of the compressor.
  • a plate spring 3 is used for a resonating motion of the piston, as shown FIG. 2 .
  • the piston (shown in FIG. 1 ) 1 constituting a compression portion 4 and the plate spring (shown in FIG. 2 ) 3 are connected by a flexible connecting bar (not shown) so that the piston 1 has forward movability within the cylinder (shown in FIG. 1 ) 2 , or the connecting bar is divided into a plurality of parts 5 a to 5 c and connected by at least one (preferably two or more) links 6 a and 6 b.
  • suction loss occurs as the outlets of the gas flow paths are exposed to the compression space during a suction stroke to thus cause a high-pressure refrigerant to enter the compression space.
  • inlets of the gas flow paths are formed in the piston, gas from the gas bearing flows backward to the compression space as the inlets of the gas flow paths are exposed to the compression space during a suction stroke.
  • an object of the present invention is to provide a reciprocating compressor which makes it easy to form a gas flow path for guiding compressed gas to a gas bearing.
  • Another object of the present invention is to provide a reciprocating compressor in which an outlet of a gas flow path is formed in a piston and an inlet of the gas flow path is formed in a cylinder to prevent the inlet or outlet of the gas flow path from communicating with a compression gas during a suction stroke of the piston and improve the performance of the compressor.
  • a reciprocating compressor comprising: a cylinder having a compression space; a piston inserted into the compression space and reciprocating relative to the cylinder; a discharge valve configured to be attachable to and detachable from a front end surface of the cylinder and selectively opening and closing the compression space of the cylinder; and a discharge cover having a discharge space to selectively communicate with the compression space, wherein the cylinder has a cylinder side gas flow path for guiding refrigerant discharged to the discharge space to an inner circumferential surface of the cylinder, and the piston has a piston side gas flow path communicating with the cylinder side gas flow path to distribute and supply the refrigerant guided through the cylinder side gas flow path between the cylinder and the piston.
  • a reciprocating compressor comprising: a cylinder having a compression space and gas flow paths for introducing gas in the compression space to an inner circumferential surface; a piston inserted into the compression space and reciprocating relative to the cylinder; a discharge valve configured to be attachable to and detachable from a front end surface of the cylinder and selectively opening and closing the compression space of the cylinder; and a discharge cover having a discharge space to selectively communicate with the compression space
  • the piston comprising: a piston body having a gas guide groove having a predetermined depth formed on an outer circumferential surface; and a gas guide member inserted and coupled to the outer circumferential surface of the piston body so as to open the gas guide groove, wherein a gas communication opening is formed in the gas guide member to allow the gas flow paths of the cylinder and the gas guide groove of the piston to communicate with each other, and a bearing hole is formed at one side of the gas communication opening to allow the gas guide groove and an bearing surface between the cylinder and the piston to communicate with each other.
  • FIG. 1 is a longitudinal cross-sectional view showing an example in which a conventional gas bearing is applied to a reciprocating compressor;
  • FIG. 2 is a perspective view showing an example in which conventional plate springs are applied to a reciprocating compressor
  • FIG. 3 is a longitudinal cross-sectional view showing a reciprocating compressor according to the present invention.
  • FIG. 4 is an exploded perspective view showing a reciprocating motor in the reciprocating compressor of FIG. 3 ;
  • FIG. 5 is a half cross-sectional view showing an example of a stator in a reciprocating motor of FIG. 3 ;
  • FIG. 6 is a half cross-sectional view showing another embodiment of the stator in the reciprocating motor of FIG. 3 ;
  • FIG. 7 is a cross-sectional view showing an embodiment of a gas bearing in the reciprocating compressor of FIG. 3 ;
  • FIG. 8 is an exploded perspective view showing a gas guide member in the piston of FIG. 7 ;
  • FIG. 9 is a cross-sectional view taken along line “I-I” of FIG. 7 ;
  • FIG. 10 is a cross-sectional view taken along line “II-II” of FIG. 7 ;
  • FIG. 11 is a cross-sectional view enlarged showing portion “A” of FIG. 5 ;
  • FIG. 12 is a cross-sectional view showing an example in which a gas diffusion groove is formed in the gas guide member of FIG. 7 ;
  • FIG. 13 is a partial cross-sectional view for explaining resonant springs in the reciprocating compressor of FIG. 3 ;
  • FIG. 14 is a top plan view for explaining the arrangement of the resonant springs of FIG. 13 .
  • a frame 20 is installed within a sealed casing 10 , a reciprocating motor 30 and a cylinder 41 are fixed to the frame 20 , a piston 42 coupled to a mover 32 of the reciprocating motor 30 is inserted into the cylinder 40 to reciprocate, and resonant springs 51 and 52 for inducing a resonating motion of the piston 42 are installed at both sides of the piston 42 in the motion direction of the piston 42 .
  • the mover 32 of the reciprocating motor 30 reciprocates. Then, the piston 42 coupled to the mover 32 sucks and compresses a refrigerant gas while linearly reciprocating within the cylinder 41 , and discharges it.
  • the piston 42 moves backwards, the refrigerant gas in the sealed casing 10 is sucked into the compression space S 1 through the suction path F of the piston 42 , and when the piston 42 moves forwards, the suction path F is closed and the refrigerant gas in the compression space S 1 is compressed. Also, when the piston 42 further moves forwards, the discharge valve 44 is opened to discharge the refrigerant gas compressed in the compression space S 1 and move it to the outside refrigeration cycle.
  • the reciprocating motor 30 comprises a stator 31 having a coil 35 and an air gap formed at only one side of the coil 35 and a mover 32 inserted into the air gap of the stator 31 and having a magnet 325 that linearly moves in the motion direction.
  • the stator 31 includes a plurality of stator blocks 311 and a plurality of pole blocks 315 respectively coupled to sides of the stator blocks 311 and forming an air gap portion 31 a along with the stator blocks 311 .
  • the stator blocks 311 and the pole blocks 315 include a plurality of thin stator cores laminated sheet by sheet in a circular arc shape when axially projected.
  • the stator blocks 311 are formed in the shape of recesses when axially projected, and the pole blocks 315 are formed in a rectangular shape when axially projected.
  • the stator block (or each of the stator core sheets constituting the stator blocks) 311 may include a first magnetic path 312 positioned inside the mover 32 to form the inner stator and a second magnetic path 313 extending integrally from an axial side of the first magnetic path 312 , i.e., the opposite end of the air portion 31 a , and positioned outside the mover 32 to form the outer stator.
  • the second magnetic path 313 is formed in a stepwise manner and extends from the first magnetic path 312 .
  • a coupling groove 311 b and a coupling protrusion 315 b may be formed on a coupling surface of the stator block 311 and a coupling surface of the pole block 315 , which connect the stator block 311 and the pole block 315 to form a magnetic path connecting portion (not shown), to firmly couple the stator block 311 and the pole block 315 and maintain a given curvature.
  • the stator block 311 and the pole block 315 may be coupled in a stepwise manner.
  • the coupling surface 311 a of the stator block 311 and the coupling surface 315 a of the pole block 315 are formed to be flat, thereby preventing an air gap between the stator block 311 and the pole block 315 . This prevents magnetic leakage between the stator block 311 and the pole block 315 , thereby leading to an increase in motor performance.
  • a first pole portion 311 c having an increasing cross-sectional area is formed at a distal end of the second magnetic path 313 of the stator block 311 , i.e., a distal end of the air gap portion 31 a
  • a second pole portion 315 c having an increasing cross-sectional area is formed at a distal end of the pole block 315 , corresponding to the first pole portion 311 c of the stator block 311 .
  • the mover 32 may include a magnet holder 321 having a cylindrical shape and a plurality of magnets 325 attached onto an outer circumferential surface of the magnet holder 321 in a circumferential direction to form a magnetic flux together with the coil 35 .
  • the magnetic holder 321 may be formed of a non-magnetic substance in order to prevent flux leakage; however, it is not limited thereto.
  • the outer circumferential surface of the magnetic holder 321 may be formed in a circular shape so that the magnets 325 are in line contact therewith and adhered thereto.
  • a magnet mounting groove (not shown) may be formed in a strip shape on the outer circumferential surface of the magnet holder 321 so as to insert the magnets 325 therein and support them in the motion direction.
  • the magnets 325 may be formed in a hexahedral shape and adhered one by one to the outer circumferential surface of the magnet holder 321 .
  • supporting members such as fixing rings or a tape made up of a composite material.
  • the magnets 325 may be serially adhered in a circumferential direction to the outer circumferential surface of the magnet holder 321 , it is preferable that the magnets 325 are adhered at predetermined intervals, i.e., between the stator blocks in a circumferential direction to the outer circumferential surface of the magnet holder 321 to minimize the use of the magnets, because the stator 31 comprises a plurality of stator blocks 311 and the plurality of stator blocks 311 are arranged at predetermined intervals in the circumferential direction.
  • the magnets 325 are preferably formed to have a length corresponding to the air gap length of the magnetic holder 321 , i.e., the circumferential length of the air gap.
  • the magnet 325 may be configured such that its length in a motion direction is not shorter than a length of the air gap portion 31 a in the motion direction, more particularly, longer than the length of the air gap portion 31 a in the motion direction.
  • the magnet 325 may be disposed such that at least one end thereof is located inside the air gap portion 31 a , in order to ensure a stable reciprocating motion.
  • magnets 325 may be disposed in the motion direction, a plurality of magnets 325 may be disposed in the motion direction in some cases.
  • the magnets may be disposed in the motion direction so that an N pole and an S pole correspond to each other.
  • the above-described reciprocating motor may be configured such that the stator has one air gap portion 314 as shown in FIG. 5 , it may be configured such that in some cases the stator has air gap portions 31 a and 31 c on both sides of the coil in the reciprocating direction as shown in FIG. 6 .
  • the mover 32 may be formed in the same manner as the foregoing embodiment.
  • the porous material member may be abraded upon initial startup before the formation of the gas bearing because of high manufacturing cost of the porous material member and low abrasion resistance thereof, and therefore the lifespan of the porous material member may be degraded. Also, it is difficult to properly regulate the distribution of pores because of the characteristics of the porous material member, which can make it difficult to design the gas bearing so as to properly seal and lubricate a portion between the cylinder and the piston.
  • the gas bearing according to this embodiment allows a high-pressure compressed gas to be uniformly distributed between the cylinder and the piston, by forming gas flow paths in the cylinder and coupling a gas guide member having gas through holes to the outer circumferential surface of the piston to uniformly distribute and supply a high-pressure compressed gas guided through the gas flow paths between the cylinder and the piston.
  • the gas flow paths 401 may comprise a cylinder side gas flow path 402 formed at the cylinder 41 and a piston side gas flow path 403 communicating with the cylinder side gas flow path 402 and formed at the piston 42 .
  • the cylinder side gas flow path 402 may comprises at least one gas inlet opening 411 c formed in a reciprocating direction of the piston 42 on a front end surface of the discharge side of the cylinder 41 and a gas pocket 411 d formed on the inner circumferential surface of the cylinder 41 , with its side wall surface communicating with the gas inlet opening 411 c .
  • the cross-sectional area of the gas pocket 411 d may be much greater than the cross-sectional area of the gas inlet opening 411 c.
  • the piston side gas flow path 403 may comprise a gas communication opening 423 a formed at a center portion of the gas guide member 423 and communicating with the gas pocket 411 d of the cylinder 41 , a gas guide groove 421 a formed on the outer circumferential surface of the piston body 421 and communicating with the gas communication opening 423 a , and a plurality of bearing holes 423 b formed on both end portions of the gas guide member 423 so as to supply gas guided through the gas guide groove 421 a between the cylinder 41 and the piston 42 .
  • the gas guide groove 421 a has an annular shape.
  • the gas guide groove 421 a has a width in the reciprocating direction much larger than the width of the gas communication opening 423 a in the reciprocating direction so that gas introduced into the gas guide groove 421 a is uniformly distributed over the entire bearing surface, that is, the length of the gas guide groove 421 a is as similar to the width of the gas guide member 423 in the reciprocating direction as possible to increase the baring surface area as much as possible.
  • the bearing holes 423 b have a significantly smaller size than the gas communication opening 423 a to prevent excessive exposure of compressed gas.
  • An annular filter 47 may be installed on the front end of the gas inlet opening, i.e., the front end surface 411 a of the cylinder body 411 so as to prevent impurities from entering the cylinder side gas flow path 402 .
  • At least one gas diffusion groove 423 c may be further formed on an outer circumferential surface of the gas guide member 423 because a high-pressure compressed gas may be uniformly distributed over a bearing area between the cylinder 41 and the piston 42 , as shown in FIG. 12 .
  • the gas diffusion groove 423 c may comprise a linear groove 423 d communicating with the gas communication opening 423 a and an annular groove 423 e communicating with the linear groove 423 d and formed in an annular shape.
  • the gas diffusion groove 423 c is formed to communicate with the gas communication opening 423 a or the bearing holes 423 b so that the compressed gas entering or introduced into the gas guide groove 421 a quickly enters the gas diffusion groove 423 c .
  • unexplained reference numeral 423 f denotes a middle guide groove.
  • the gas guide member 423 is formed in a cylindrical shape and inserted and coupled to the piston body, a part of compressed gas discharged to the discharge space S 2 of the discharge cover 46 enters the gas pocket 411 d through the gas inlet opening 411 c , and this compressed gas enters the gas guide groove 421 a through the gas communication opening 423 a of the gas guide member 423 and diffused in the gas guide groove 421 a , thereby supplying the compressed gas between the cylinder 41 and the piston 42 through the bearing holes 423 b of the gas guide member 423 .
  • the bearing holes 423 b which are the outlets of the gas flow paths, are formed in the piston 42 , the outlets of the gas flow paths are not exposed to the compression space S 1 during a suction stroke of the piston 42 , thereby preventing a degradation in the performance of the compressor caused by a suction loss.
  • the gas guide member 423 has a simple cylindrical shape, and hence the manufacturing costs can be reduced, compared to the porous material member.
  • the above-described reciprocating compressor with the gas bearing according to this embodiment is devised to reduce material costs and the number of assembly processes by using not plate springs but coil springs as the resonant springs, and avoiding the use of a connecting bar or link.
  • the above-described reciprocating compressor with the gas bearing according to this embodiment is devised to reduce material costs and the number of assembly processes by using not plate springs but coil springs as the resonant springs, and avoiding the use of a connecting bar or link.
  • the resonant springs may comprise a first resonant spring and a second resonant spring 52 which are respectively provided on both front and back sides of a spring supporter 53 coupled to the mover 32 and the piston 42 .
  • the first resonant spring 51 and the second resonant spring 52 each are provided in plural and arranged in a circumferential direction. However, either the first resonant spring 51 or the second resonant spring 52 may be provided in plural, and the other resonant spring may be provided in singular.
  • the resonant springs 51 and 52 are compressed coil springs as described above, a side force may be produced when the resonant springs 51 and 52 are expanded. Accordingly, the resonant springs 51 and 52 may be arranged so as to offset a side force or torsion moment of the resonant springs 51 and 52 .
  • first resonant spring 51 and the second resonant spring 52 are arranged alternately by twos in a circumferential direction
  • distal ends of the first and second resonant springs 51 and 52 are wound at the same position in opposite directions (counterclockwise) relative to the center of the piston 42
  • the resonant springs on the same side positioned in their respective diagonal directions are arranged to symmetrically engage each other so that a side force and a torsion moment are produced in opposite directions.
  • first resonant spring 51 and the second resonant spring 52 may be arranged to symmetrically engage the distal ends of the resonant springs with each other so that a side force and a torsion moment are produced in opposite directions along the circumferential direction.
  • first resonant springs 51 are arranged so that lines orthogonal to the front end surfaces of the springs meet at one point to thus offset a side force and a torsion moment.
  • spring fixing protrusions 531 and 532 are respectively formed on a frame or spring supporter 53 to which the ends of the first and second resonant springs 51 and 52 are fixed, in order for the resonant springs 51 and 52 to be forcibly fit and fixed to the spring fixing protrusions 53 , because the engaging resonant springs are prevented from turning.
  • the number of first resonant springs 51 may be equal to or different from the number of second resonant springs 52 as long as the first resonant spring 51 and the second resonant spring 52 have the same elasticity.
  • a side force and a torsion moment may be produced when expanded because of the characteristics of the compression coil springs, and therefore the forward movement of the piston 42 may be distorted.
  • the plurality of first resonant springs 51 and second resonant springs 52 are arranged to be wound in opposite directions, and therefore the side force and torsion moment produced from the resonant springs 51 and 52 are offset by the diagonally corresponding resonant springs. Accordingly, the forward movement of the piston 42 can be maintained, and abrasion of surfaces contacting the resonant springs 51 and 52 can be prevented.
  • the compressor can be installed in a standing type, as well as in a lateral type because compression coil springs, which have a small longitudinal placement, are used as the resonant springs 51 and 52 .
  • the manufacturing costs and the number of assembly processes can be reduced because no connecting bar or link is required.
  • the resonant springs may be used in the same manner as above even when the reciprocating motor is mechanically coupled to a compression unit comprising the cylinder with a predetermined interval therefrom. A detailed description of which will be omitted.
  • the piston is configured to reciprocate and the resonant springs are respectively provided on both sides of the piston in the motion direction.
  • the cylinder may be configured to reciprocate and the resonant springs may be provided on both sides of the cylinder.
  • the resonant springs may be formed as a plurality of compression coil springs, as in the foregoing embodiments, and the plurality of compression coil springs may be arranged in the same manner as the foregoing embodiments. A detailed description of which will be omitted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Compressor (AREA)
US13/602,951 2011-09-06 2012-09-04 Reciprocating compressor Abandoned US20130058816A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2011-0090322 2011-09-06
KR1020110090322A KR101860340B1 (ko) 2011-09-06 2011-09-06 왕복동식 압축기

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US13/602,951 Abandoned US20130058816A1 (en) 2011-09-06 2012-09-04 Reciprocating compressor

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US (1) US20130058816A1 (ko)
EP (1) EP2568172B1 (ko)
KR (1) KR101860340B1 (ko)
CN (1) CN102979698B (ko)
ES (1) ES2613072T3 (ko)

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