WO2004081378A2 - Cylinder supporting structure of reciprocating compressor - Google Patents

Cylinder supporting structure of reciprocating compressor Download PDF

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Publication number
WO2004081378A2
WO2004081378A2 PCT/KR2004/000508 KR2004000508W WO2004081378A2 WO 2004081378 A2 WO2004081378 A2 WO 2004081378A2 KR 2004000508 W KR2004000508 W KR 2004000508W WO 2004081378 A2 WO2004081378 A2 WO 2004081378A2
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WO
WIPO (PCT)
Prior art keywords
cylinder
frame
support
insertion hole
axial support
Prior art date
Application number
PCT/KR2004/000508
Other languages
French (fr)
Other versions
WO2004081378A3 (en
Inventor
Sang-Wook Ahn
Original Assignee
Lg Electronics Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Publication of WO2004081378A2 publication Critical patent/WO2004081378A2/en
Publication of WO2004081378A3 publication Critical patent/WO2004081378A3/en

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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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1045—Cylinders
    • 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 present invention relates to a reciprocating compressor, and in particular to a cylinder supporting structure of a reciprocating compressor capable of facilitating assembly operation of a cylinder combined with a frame and preventing deformation of the cylinder when the cylinder is fixed-combined with the frame and a discharge cover covering thereon.
  • a compressor converts electric energy into kinetic energy and compresses refrigerant by the kinetic energy.
  • the compressor is the core part, and the compressor can be divided into a rotary compressor, a scroll compressor and a reciprocating compressor, etc. according to fluid compression mechanisms.
  • Figure 1 is a sectional view illustrating the reciprocating compressor. As depicted in
  • the reciprocating compressor includes a casing 100 having a gas suction pipe 110 and a discharge pipe 120; a frame unit 200 disposed in the casing 100; a driving motor 300 installed to the frame unit 200 to generate a linear reciprocating driving force; a compression unit 400 for compressing gas by receiving the driving force of the driving motor 300; and a resonance spring unit 500 for resonating the driving force of the driving motor 300.
  • the frame unit 200 includes a front frame 210 for housing the compression unit
  • middle frame 220 combined with the front frame 210; and a rear frame 230 for fixing the driving motor 300 with the middle frame 220.
  • the driving motor 300 includes an outer stator 310 fixed between the middle frame
  • the mover 330 consists of a magnet 331 and a magnet holder 332 for supporting the magnet 331.
  • the compression unit 400 includes a cylinder 410 fixedly combined with the front frame 210; a piston 420 in which one end is movably inserted into an inner space (P) of the cylinder 410 and the other end is fixedly combined with the mover 330; a discharge cover 430 installed to a side of the front frame 210 to cover the inner space (P) of the cylinder; a discharge valve 440 disposed in the discharge cover 430 to open/ close the inner space (P) of the cylinder; a discharge spring 450 disposed in the discharge cover 430 to support the discharge valve 440; and a suction valve 460 installed to the end of the piston 420 to control flow of refrigerant sicked into the inner space (P) of the cylinder.
  • Reference numeral 510 is a spring support, 520 is a front coil spring, and 530 is a rear coil spring.
  • the piston 420 performs a linear reciprocating motion in the inner space (P) of the cylinder 410, by a pressure difference generated in the inner space (P) of the cylinder 420 according to the linear reciprocating motion, the suction valve 460 and the discharge valve 440 are operated, and accordingly the refrigerant is sucked into the inner space (P) of the cylinder 410, compressed and discharged.
  • the discharged refrigerant is discharged to the outside through the discharge cover 430 and the discharge pipe 120 combined with the discharge cover 430.
  • Figure 2 is an exploded- sectional view illustrating the assembly of the cylinder.
  • a cylinder insertion hole 212 having a certain inner diameter is pierced- formed at a certain- shaped body portion 211, a ring- shaped oil pocket 213 having a certain width and depth is formed on the inner circumference of the cylinder insertion hole 212, and a mounting portion 214 having a certain depth and outer diameter is formed at an inlet side of the cylinder insertion hole 212.
  • the cylinder 410 is inserted into the cylinder insertion hole 412 of the front frame 210.
  • the cylinder 410 includes a cylinder portion 411 having a certain length; and a ring-shaped bridging portion 412 extended-projected from the outer circumference of the cylinder portion 411.
  • the cylinder portion 411 is inserted into the cylinder insertion hole 212 of the body portion 211, and the bridging portion 412 is inserted into the mounting portion 214.
  • the discharge cover 430 includes a cap portion 431 having a cap shape; and a flange portion 432 curved-extended from the end of the cap portion 431.
  • the discharge cover 430 is fixedly combined with the front frame 210.
  • An oil passage 218 in which oil flow into/out of the oil pocket 213 is respectively formed at the front frame 210.
  • the piston 420 is movably inserted into the inner space (P) of the cylinder.
  • Reference numeral 433 is a through hole, and 219 is a screw hole.
  • [22] F wever, in the above-mentioned structure, when the plural bolts 10 are fastened in order to combine the discharge cover 430, the front frame 210 and the cylinder 410, a fastening force applied on the bolts 10 is transmitted to the front frame 210.
  • the fastening force transmitted to the front frame 210 acts on the portion at which bolt 10 is combined, due to that, repulsive power may act on the front support portion 215 which is the inner side of the portion at which the bolt 10 is fastened, and twisted force generated in fastening of the bolts 10 may act on the front support portion 215.
  • a reciprocating compressor including a frame having a cylinder insertion hole therein, a cylinder inserted into the cylinder insertion hole of the frame, a piston performing a linear reciprocating motion in the cylinder by receiving a driving force of a driving motor, a discharge cover for covering a side of the cylinder and a fastening means for combining the discharge cover with the frame
  • a cylinder supporting structure of a reciprocating compressor includes a bridging portion formed in the cylinder; an axial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the length direction by being supported by the bridging portion of the cylinder; and a radial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the circumferentional direction by being contacted- supported by the outer surface of the cylinder.
  • Figure 1 is a sectional view illustrating a general reciprocating compressor
  • Figure 2 is an exploded- sectional view illustrating assembly of a cylinder of the conventional reciprocating compressor
  • Figure 3 is an enlarged- sectional view illustrating a cylinder supporting structure of the reciprocating compressor
  • Figures 4 and 5 are a front-sectional view and a side-sectional view illustrating a cylinder supporting structure of a reciprocating compressor respectively;
  • Figure 6 is a sectional view illustrating a modified example of an axial support of a cylinder supporting structure of the reciprocating compressor in accordance with the present invention.
  • Figure 7 is a partial-enlarged sectional view illustrating the cylinder supporting structure of the reciprocating compressor in accordance with the present invention.
  • Figures 4 and 5 are a front-sectional view and a side-sectional view illustrating a cylinder supporting structure of a reciprocating compressor respectively.
  • the same parts with the conventional art will have the same reference numerals.
  • a cylinder 410 is inserted into a front frame 240 of a frame unit 200, and a piston 420 is movably inserted into an inner space (P) of the cylinder.
  • a discharge cover 430 covers a side of the cylinder 410 and is fixedly combined with the front frame 240 by a fastening means.
  • the fastening means is plural bolts.
  • a cylinder insertion hole 242 having a certain inner diameter is formed at a certain- shaped body portion 241.
  • a ring-shaped axial support 243 having a certain width and height is formed at the inner circumference of the cylinder insertion hole 242
  • a ring-shaped radial support 244 having a certain width and height is formed at the inner circumference of the cylinder insertion hole 242 at a certain internal from the axial support 243, herein the radial support 244 has an inner diameter greater than that of the axial support 243.
  • the axial support 243 is arranged so as to be nearer to the discharge cover 430 in comparison with the radial support 244.
  • the axial support 243 and the radial support 244 are extended- formed on the inner circumference of the cylinder insertion hole 242.
  • the cylinder 410 includes a cylinder unit 411 having a certain length so as to receive a piston 420 therein; and a bridging portion 412 projected from the outer circumference of the cylinder portion 411 so as to have a certain width and height.
  • the bridging portion 412 has a ring shape.
  • An inner diameter of the cylinder insertion hole 242 of the front frame 240 is greater than an outer diameter of the cylinder unit 411 of the cylinder 410, an inner diameter of the radial support 244 of the front frame 240 is the same with an outer diameter of the cylinder unit 411 of the cylinder 410, and an inner diameter of the axial support 243 is smaller than an outer diameter of the cylinder unit 411.
  • a side surface of the bridging portion 412 is contacted to a side surface of the axial support 243, and the inner circumference of the radial support 244 is contacted to the outer circumference of the cylinder unit 411.
  • the cylinder 410 is supported in the axial direction, by contacting an inner surface (A) of the radial support 244 of the front frame 240 to the outer circumference of the cylinder unit 411, the cylinder 410 is supported in the radial direction.
  • a width (a) of the radial support 244 is greater than a width (b) of the axial support
  • An oil pocket 245 in which oil circulates is formed in a space between the axial support 243 and the radial support 244.
  • a mounting portion 247 is formed between an inlet of the cylinder insertion hole 242 and a side of the axial support 243.
  • a width (c) (in the length direction) of the bridging portion 412 is the same with or greater than a distance between the end of the inlet of the cylinder insertion hole 242 of the front frame and a side surface of the axial support 243.
  • An outer diameter of the bridging portion 412 is smaller than an inner diameter of the cylinder insertion hole 242.
  • the discharge cover 430 includes a cap portion 431 having a cap shape and a flange portion 432 curved-extended from the cap portion 431.
  • the discharge cover 430 is fixedly combined with the front frame 240, by fastening the plural bolts 10 to the discharge cover 430 and the front frame 240, the cylinder 410 is pressurized-fixed to the discharge cover 430.
  • a discharge valve 440 for opening/closing an inner space (P) of the cylinder and a discharge spring 450 for elastically supporting the discharge valve 440 are arranged.
  • the axial support 243 consists of plural protrusions (B) extended-formed at the inner wall of the cylinder insertion hole 242 so as to have a certain width, height and length in the circumferential direction.
  • a diameter of a circle formed by the inner surface of the plural protrusions (B) is greater than an outer diameter of the cylinder 410.
  • the cylinder 410 combined with the front frame 240 is supported in the axial and radial direction by pressurization of the discharge cover 430, and accordingly a combination state is firm.
  • the bridging portion 412 of the cylinder contacts -supports the axial support 243 in the axial direction
  • the discharge cover 430 pressurizes the cylinder 410 in the axial direction
  • the radial support 244 of the front frame supports the outer circumference of the cylinder portion 411 of the cylinder in the radial direction, and accordingly the combination state of the cylinder 410 is firm.
  • the fastening force by the bolts 10 acts on the front frame 240.
  • the fastening force acting on the front frame 240 acts on a portion at which the bolt 10 is combined, according to that, repulsive power acts on the axial support 243 formed at the inner side of the portion (at which the bolt 10 is combined), and twisted force occurred in fastening of the bolts 10 acts on the axial support 243.
  • an inner diameter of the axial support 243 of the front frame is greater than an outer diameter of the cylinder portion 411, when the cylinder 410 is combined with the front frame 240, assembly operation can be simplified.
  • the cylinder supporting structure of the reciprocating compressor in accordance with the present invention when the cylinder for compressing gas is fixedly combined with the frame, by preventing deformation of the cylinder, the cylinder can maintain a set assembly size, and accordingly it is possible to prevent contact and abrasion between parts in operation and perform the operation smoothly. Therefore, life span of the parts can be extended, and reliability can be improved.

Abstract

In a cylinder supporting structure (215) of a reciprocating compressor for combining a cylinder (410) compressing gas with a frame (240) with a fastening means, by inclduing a bridging portion (412) formed in the cylinder (410); an axial support extende-projected from the inner circumference of the cylinder (410) insertion hole of the frame to support the cylinder inte length direction by being suuported by the ridging portion (412) of the cylinder (410); and a radial support extended-projected from the inner circumference of the cylinder insertion hole (242) of the frame to support the cylinder (410) in the circumferentional direction by being contacted-supported by the outer surface of the cylinder, it is posible to prevent deformation of the cylinder (410) and facilitate assembly operation.

Description

Description CYLINDER SUPPORTING STRUCTURE OF RECIPROCATING COMPRESSOR
Technical Field
[1] The present invention relates to a reciprocating compressor, and in particular to a cylinder supporting structure of a reciprocating compressor capable of facilitating assembly operation of a cylinder combined with a frame and preventing deformation of the cylinder when the cylinder is fixed-combined with the frame and a discharge cover covering thereon.
Background Art
[2] Generally, a compressor converts electric energy into kinetic energy and compresses refrigerant by the kinetic energy. The compressor is the core part, and the compressor can be divided into a rotary compressor, a scroll compressor and a reciprocating compressor, etc. according to fluid compression mechanisms.
[3] Figure 1 is a sectional view illustrating the reciprocating compressor. As depicted in
Figure 1, the reciprocating compressor includes a casing 100 having a gas suction pipe 110 and a discharge pipe 120; a frame unit 200 disposed in the casing 100; a driving motor 300 installed to the frame unit 200 to generate a linear reciprocating driving force; a compression unit 400 for compressing gas by receiving the driving force of the driving motor 300; and a resonance spring unit 500 for resonating the driving force of the driving motor 300.
[4] The frame unit 200 includes a front frame 210 for housing the compression unit
400; a middle frame 220 combined with the front frame 210; and a rear frame 230 for fixing the driving motor 300 with the middle frame 220.
[5] The driving motor 300 includes an outer stator 310 fixed between the middle frame
220 and the rear frame 230; an inter stator 320 inserted into the outer stator 310 and fixedly combined with the rear frame 230; a mover 330 movably inserted between the outer stator 310 and the inner stator 320; and a wiring coil 340 combined with the outer stator 310. The mover 330 consists of a magnet 331 and a magnet holder 332 for supporting the magnet 331.
[6] The compression unit 400 includes a cylinder 410 fixedly combined with the front frame 210; a piston 420 in which one end is movably inserted into an inner space (P) of the cylinder 410 and the other end is fixedly combined with the mover 330; a discharge cover 430 installed to a side of the front frame 210 to cover the inner space (P) of the cylinder; a discharge valve 440 disposed in the discharge cover 430 to open/ close the inner space (P) of the cylinder; a discharge spring 450 disposed in the discharge cover 430 to support the discharge valve 440; and a suction valve 460 installed to the end of the piston 420 to control flow of refrigerant sicked into the inner space (P) of the cylinder.
[7] Reference numeral 510 is a spring support, 520 is a front coil spring, and 530 is a rear coil spring.
[8] Operation of the reciprocating compressor will be described as following.
[9] When power is supplied to the reciprocating compressor, a linear reciprocating driving force is generated by electro-magnetic mutual operation of the driving motor 300, and the linear reciprocating driving force is transmitted to the piston 420 through the mover 330.
[10] The piston 420 performs a linear reciprocating motion in the inner space (P) of the cylinder 410, by a pressure difference generated in the inner space (P) of the cylinder 420 according to the linear reciprocating motion, the suction valve 460 and the discharge valve 440 are operated, and accordingly the refrigerant is sucked into the inner space (P) of the cylinder 410, compressed and discharged. The discharged refrigerant is discharged to the outside through the discharge cover 430 and the discharge pipe 120 combined with the discharge cover 430.
[11] By the resonance spring unit 500, the motion of the mover 330 and the piston 420 is resonated.
[12] In the meantime, in order to minimize leakage of compression refrigerant between the cylinder 410 and the piston 420 in the operation and improve a compression performance, the cylinder 410 and the piston 420 have to be assembled precisely. In addition, in order to make the piston 420 perform the linear reciprocating motion smoothly in the inner space (P) of the cylinder 410, the cylinder 410 has to be precisely combined to the front frame 210.
[13] Figure 2 is an exploded- sectional view illustrating the assembly of the cylinder.
[14] As depicted in Figure 2, in the front frame 210, a cylinder insertion hole 212 having a certain inner diameter is pierced- formed at a certain- shaped body portion 211, a ring- shaped oil pocket 213 having a certain width and depth is formed on the inner circumference of the cylinder insertion hole 212, and a mounting portion 214 having a certain depth and outer diameter is formed at an inlet side of the cylinder insertion hole 212.
[15] The cylinder 410 is inserted into the cylinder insertion hole 412 of the front frame 210. The cylinder 410 includes a cylinder portion 411 having a certain length; and a ring-shaped bridging portion 412 extended-projected from the outer circumference of the cylinder portion 411. In the cylinder 410, the cylinder portion 411 is inserted into the cylinder insertion hole 212 of the body portion 211, and the bridging portion 412 is inserted into the mounting portion 214.
[16] By the oil pocket 213 and the mounting portion 214 formed at the inner circumference of the cylinder insertion hole 212, relatively projected two portions are formed, one is a front support portion 215, and the other is a rear support portion 216. An inner diameter of the front support portion 215 and the rear support portion 216 is corresponded to an outer diameter of the cylinder portion 411 of the cylinder 410, the front support portion 215 and the rear support portion 216 are contacted to the outer circumference of the cylinder portion 411 of the cylinder 410, and accordingly the cylinder 410 is supported. In addition, an inner diameter of the mounting portion 214 is corresponded to an outer diameter of the bridging portion 412 of the cylinder 410.
[17] The discharge cover 430 includes a cap portion 431 having a cap shape; and a flange portion 432 curved-extended from the end of the cap portion 431.
[18] In the discharge cover 430, the flange portion 432 is contacted to the end surface
217 of the body portion 211 of the front frame and the side surface 413 of the bridging portion 412 of the cylinder, and the flange portion 432 is combined with the end surface 217 of the body portion 411 of the front frame by plural bolts 10 fastened at the flange portion 432 of the discharge cover. Accordingly, the discharge cover 430 is fixedly combined with the front frame 210.
[19] An oil passage 218 in which oil flow into/out of the oil pocket 213 is respectively formed at the front frame 210.
[20] The piston 420 is movably inserted into the inner space (P) of the cylinder.
[21] Reference numeral 433 is a through hole, and 219 is a screw hole.
[22] F wever, in the above-mentioned structure, when the plural bolts 10 are fastened in order to combine the discharge cover 430, the front frame 210 and the cylinder 410, a fastening force applied on the bolts 10 is transmitted to the front frame 210.
[23] The fastening force transmitted to the front frame 210 acts on the portion at which bolt 10 is combined, due to that, repulsive power may act on the front support portion 215 which is the inner side of the portion at which the bolt 10 is fastened, and twisted force generated in fastening of the bolts 10 may act on the front support portion 215.
[24] By the repulsive power and twisted force acting on the front support portion 215, as depicted in Figure 3, deformation occurs at the front support portion 215 supporting the cylinder 410, and the deformation force is transmitted to the cylinder 410 contacted with the front support portion 215. By the force transmitted to the cylinder 410, the cylinder 410 may be deformed or error may occur in assembly size of the cylinder, and accordingly abrasion of the parts may occur or operation may not be performed smoothly.
Disclosure
[25] In order to solve the above-mentioned problems, it is an object of the present invention to provide a cylinder supporting structure of a reciprocating compressor capable of facilitating assembly operation of a cylinder combined with a frame and preventing deformation of the cylinder in combining of a discharge cover for covering the cylinder with the frame.
[26] In order to achieve the above-mentioned object, in a reciprocating compressor including a frame having a cylinder insertion hole therein, a cylinder inserted into the cylinder insertion hole of the frame, a piston performing a linear reciprocating motion in the cylinder by receiving a driving force of a driving motor, a discharge cover for covering a side of the cylinder and a fastening means for combining the discharge cover with the frame, a cylinder supporting structure of a reciprocating compressor includes a bridging portion formed in the cylinder; an axial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the length direction by being supported by the bridging portion of the cylinder; and a radial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the circumferentional direction by being contacted- supported by the outer surface of the cylinder.
Description of Drawings
[27] Figure 1 is a sectional view illustrating a general reciprocating compressor;
[28] Figure 2 is an exploded- sectional view illustrating assembly of a cylinder of the conventional reciprocating compressor;
[29] Figure 3 is an enlarged- sectional view illustrating a cylinder supporting structure of the reciprocating compressor;
[30] Figures 4 and 5 are a front-sectional view and a side-sectional view illustrating a cylinder supporting structure of a reciprocating compressor respectively;
[31] Figure 6 is a sectional view illustrating a modified example of an axial support of a cylinder supporting structure of the reciprocating compressor in accordance with the present invention; and
[32] Figure 7 is a partial-enlarged sectional view illustrating the cylinder supporting structure of the reciprocating compressor in accordance with the present invention.
Mode for Invention
[33] Hereinafter, the preferred embodiments of the present invention will be described with reference to accompanying drawings.
[34] Figures 4 and 5 are a front-sectional view and a side-sectional view illustrating a cylinder supporting structure of a reciprocating compressor respectively. The same parts with the conventional art will have the same reference numerals.
[35] As depicted in Figures 4 and 5, a cylinder 410 is inserted into a front frame 240 of a frame unit 200, and a piston 420 is movably inserted into an inner space (P) of the cylinder. And, a discharge cover 430 covers a side of the cylinder 410 and is fixedly combined with the front frame 240 by a fastening means. The fastening means is plural bolts.
[36] In the front frame 240, a cylinder insertion hole 242 having a certain inner diameter is formed at a certain- shaped body portion 241. And, a ring-shaped axial support 243 having a certain width and height is formed at the inner circumference of the cylinder insertion hole 242, a ring-shaped radial support 244 having a certain width and height is formed at the inner circumference of the cylinder insertion hole 242 at a certain internal from the axial support 243, herein the radial support 244 has an inner diameter greater than that of the axial support 243.
[37] The axial support 243 is arranged so as to be nearer to the discharge cover 430 in comparison with the radial support 244. The axial support 243 and the radial support 244 are extended- formed on the inner circumference of the cylinder insertion hole 242.
[38] The cylinder 410 includes a cylinder unit 411 having a certain length so as to receive a piston 420 therein; and a bridging portion 412 projected from the outer circumference of the cylinder portion 411 so as to have a certain width and height. The bridging portion 412 has a ring shape.
[39] An inner diameter of the cylinder insertion hole 242 of the front frame 240 is greater than an outer diameter of the cylinder unit 411 of the cylinder 410, an inner diameter of the radial support 244 of the front frame 240 is the same with an outer diameter of the cylinder unit 411 of the cylinder 410, and an inner diameter of the axial support 243 is smaller than an outer diameter of the cylinder unit 411.
[40] In the cylinder 410, the cylinder unit 411 is inserted into the cylinder insertion hole
242 of the front frame 240, a side surface of the bridging portion 412 is contacted to a side surface of the axial support 243, and the inner circumference of the radial support 244 is contacted to the outer circumference of the cylinder unit 411. By contacting the side of the axial support 243 of the front frame 240 to the side of the bridging portion 412, the cylinder 410 is supported in the axial direction, by contacting an inner surface (A) of the radial support 244 of the front frame 240 to the outer circumference of the cylinder unit 411, the cylinder 410 is supported in the radial direction.
[41] A width (a) of the radial support 244 is greater than a width (b) of the axial support
243.
[42] An oil pocket 245 in which oil circulates is formed in a space between the axial support 243 and the radial support 244. A mounting portion 247 is formed between an inlet of the cylinder insertion hole 242 and a side of the axial support 243. A width (c) (in the length direction) of the bridging portion 412 is the same with or greater than a distance between the end of the inlet of the cylinder insertion hole 242 of the front frame and a side surface of the axial support 243. An outer diameter of the bridging portion 412 is smaller than an inner diameter of the cylinder insertion hole 242.
[43] The discharge cover 430 includes a cap portion 431 having a cap shape and a flange portion 432 curved-extended from the cap portion 431.
[44] In the discharge cover 430, the flange portion 432 is contacted to an end surface
246 of the body portion of the front frame and a side of the bridging portion 412 of the cylinder, and plural bolts 10 pierce through holes 433 formed at the flange portion 432 and are respectively fastened to screw holes 248 formed at the end surface 246 of the body portion of the front frame. According to that, the discharge cover 430 is fixedly combined with the front frame 240, by fastening the plural bolts 10 to the discharge cover 430 and the front frame 240, the cylinder 410 is pressurized-fixed to the discharge cover 430.
[45] In the front frame 240, oil passages 249 in which oil flows into/out of the oil pocket
245 are formed.
[46] In the discharge cover 430, a discharge valve 440 for opening/closing an inner space (P) of the cylinder and a discharge spring 450 for elastically supporting the discharge valve 440 are arranged.
[47] As depicted in Figure 6, as a modified form of the axial support 243, the axial support 243 consists of plural protrusions (B) extended-formed at the inner wall of the cylinder insertion hole 242 so as to have a certain width, height and length in the circumferential direction. A diameter of a circle formed by the inner surface of the plural protrusions (B) is greater than an outer diameter of the cylinder 410.
[48] Hereinafter, advantages of the cylinder supporting structure of the reciprocating compressor in accordance with the present invention will be described. [49] In the present invention, the cylinder 410 combined with the front frame 240 is supported in the axial and radial direction by pressurization of the discharge cover 430, and accordingly a combination state is firm. In more detail, the bridging portion 412 of the cylinder contacts -supports the axial support 243 in the axial direction, the discharge cover 430 pressurizes the cylinder 410 in the axial direction, the radial support 244 of the front frame supports the outer circumference of the cylinder portion 411 of the cylinder in the radial direction, and accordingly the combination state of the cylinder 410 is firm.
[50] And, when the plural bolts 10 are fastened to combine the discharge cover 430, the front frame 240 and the cylinder 410, the fastening force by the bolts 10 acts on the front frame 240. The fastening force acting on the front frame 240 acts on a portion at which the bolt 10 is combined, according to that, repulsive power acts on the axial support 243 formed at the inner side of the portion (at which the bolt 10 is combined), and twisted force occurred in fastening of the bolts 10 acts on the axial support 243. F wever, because the axial support 243 is not contacted to the cylinder portion 411 of the cylinder but maintains a certain interval, the repulsive power and the twisted force act only on the axial support 243 without being transmitted to the cylinder 410. Accordingly, by the fastening of the plural bolts 10, deformation of the cylinder is prevented, by making the fastening force of the bolts 10 acting only in the axial direction of the cylinder 410 through the discharge cover 430, the bridging portion 412 of the cylinder is supported by the axial support 243 in the axial direction, and accordingly the cylinder 410 is fixed.
[51] In addition, in the present invention, an inner diameter of the axial support 243 of the front frame is greater than an outer diameter of the cylinder portion 411, when the cylinder 410 is combined with the front frame 240, assembly operation can be simplified.
Industrial Applicability
[52] As described-above, in the cylinder supporting structure of the reciprocating compressor in accordance with the present invention, when the cylinder for compressing gas is fixedly combined with the frame, by preventing deformation of the cylinder, the cylinder can maintain a set assembly size, and accordingly it is possible to prevent contact and abrasion between parts in operation and perform the operation smoothly. Therefore, life span of the parts can be extended, and reliability can be improved.
[53] In addition, by facilitating assembly operation of the cylinder, assembly pro- ductivity can be improved, by maintaining a firm assembly state, collision and noise among the parts can be prevented.

Claims

Claims
[1] In a reciprocating compressor including a frame having a cylinder insertion hole therein, a cylinder inserted into the cylinder insertion hole of the frame, a piston performing a linear reciprocating motion in the cylinder by receiving a driving force of a driving motor, a discharge cover for covering a side of the cylinder and a fastening means for combining the discharge cover with the frame, a cylinder supporting structure of a reciprocating compressor, comprising: a bridging portion formed in the cylinder; an axial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the length direction by being supported by the bridging portion of the cylinder; and a radial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the circumferentional direction by being contacted- supported by the outer surface of the cylinder.
[2] The structure of claim 1, wherein the axial support is formed as a ring shape having a certain width and height, and an inner diameter of the axial support is greater than an outer diameter of the cylinder.
[3] The structure of claim 1, wherein the radial support is formed as a ring shape having a certain width and height, and an inner diameter of the radial support is the same with an outer diameter of the cylinder.
[4] The structure of claim 1, wherein a length directional width of the radial support is greater than a length directional width of the axial support.
[5] The structure of claim 1, wherein the bridging portion of the cylinder on the outer circumference of the cylinder is formed as a ring shape having a certain width and height
[6] The structure of claim 5, wherein an outer diameter of the bridging portion is smaller than an inner diameter of the cylinder insertion hole of the frame.
[7] The structure of claim 1, wherein the axial support and the radial support are formed so as to have a certain interval therebetween, and an oil pocket in which oil flows is formed between the axial support and the radial support.
[8] The structure of claim 1, wherein a distance between the inlet end of the cylinder insertion hole of the cylinder and a side of the axial support is less than or the same with a length directional width of the bridging portion of the cylinder.
[9] The structure of claim 1, wherein the cylinder is pressurized-combined with the discharge cover by combining the discharge cover and the frame by using the fastening means. [10] The structure of claim 1, wherein the axial support consists of plural protrusions extended- formed at the inner wall of the cylinder insertion hole of the frame so as to have a certain width, height and circumferential length, and a diameter of a circle formed by the inner surface of the protrusions is greater than an outer diameter of the cylinder.
PCT/KR2004/000508 2003-03-11 2004-03-11 Cylinder supporting structure of reciprocating compressor WO2004081378A2 (en)

Applications Claiming Priority (2)

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KR20030015222A KR100511327B1 (en) 2003-03-11 2003-03-11 Structure for supporting cylinder of reciprocating compressor

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EP3249224A3 (en) * 2016-05-03 2018-03-07 LG Electronics, Inc. Linear compressor
EP3348830A1 (en) * 2017-01-12 2018-07-18 LG Electronics Inc. Linear compressor
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EP1674725A2 (en) * 2004-12-22 2006-06-28 Lg Electronics Inc. Reciprocating compressor
EP1674725A3 (en) * 2004-12-22 2007-01-24 Lg Electronics Inc. Reciprocating compressor
US7381033B2 (en) 2004-12-22 2008-06-03 Lg Electronics Inc. Reciprocating compressor
WO2009054639A2 (en) * 2007-10-24 2009-04-30 Lg Electronics, Inc. Linear compressor
WO2009054639A3 (en) * 2007-10-24 2010-04-29 Lg Electronics, Inc. Linear compressor
CN101835983B (en) * 2007-10-24 2012-11-14 Lg电子株式会社 Linear compressor
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CN105298802A (en) * 2014-07-21 2016-02-03 Lg电子株式会社 Linear compressor and refrigerator including a linear compressor
EP2977610A1 (en) * 2014-07-21 2016-01-27 LG Electronics Inc. Linear compressor and refrigerator including a linear compressor
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US10400757B2 (en) 2016-01-19 2019-09-03 Lg Electronics Inc. Linear compressor
EP3196460B1 (en) * 2016-01-19 2023-04-26 Lg Electronics Inc. Linear compressor
EP3249224A3 (en) * 2016-05-03 2018-03-07 LG Electronics, Inc. Linear compressor
US10533546B2 (en) 2016-05-03 2020-01-14 Lg Electronics Inc. Linear compressor
EP3348830A1 (en) * 2017-01-12 2018-07-18 LG Electronics Inc. Linear compressor
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Publication number Publication date
CN1759246A (en) 2006-04-12
KR20040080460A (en) 2004-09-20
CN100416098C (en) 2008-09-03
WO2004081378A3 (en) 2004-12-16
KR100511327B1 (en) 2005-08-31

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