WO2004081379A2

WO2004081379A2 - Reciprocating compressor having vibration attenuating supporting unit

Info

Publication number: WO2004081379A2
Application number: PCT/KR2004/000510
Authority: WO
Inventors: Kyung-Seok Kang
Original assignee: Lg Electronics Inc.
Priority date: 2003-03-11
Filing date: 2004-03-11
Publication date: 2004-09-23
Also published as: WO2004081379A3; KR20040080454A; CN1759245B; CN1759245A

Abstract

A reciprocating compressor comprises: a casing having a predetermined inner space and provided with a suction pipe for sucking a fluid from outside and a discharge pipe for discharging a fluid to outside; a compressor body disposed inside the casing for compressing the fluid introduced through the suction pipe by a linear reciprocating of the piston and then discharging the compressed fluid through the discharge pipe, and supporting unit that a plurality of elastic members and at least one mass body are alternately connected in order to absorb vibration generated from the body, for supporting the compressor body at the casing. The mass bodies of the supporting unit are vibrated between the plurality of elastic member, thereby greatly reducing vibration and noise generated from the compressor body.

Description

Description RECIPROCATING COMPRESSOR HAVING VIBRATION

ATTENUATING SUPPORTING UNIT

Technical Field

[1] The present invention relates to a reciprocating compressor having a vibration attenuating supporting unit, and more particularly, to a reciprocating compressor having a vibration attenuating supporting unit for reducing vibration generated at the time of an operation of a compressor.

Background Art

[2] In general, a reciprocating compressor is an apparatus constituting an air conditioner for sucking a refrigerant gas into a compressor and discharging a compressed gas outside the compressor accordingly as a piston is linearly-reciprocated inside a cylinder.

[3] As shown in Figure 1, the conventional reciprocating compressor comprises: a casing 10 forming an appearance of the compressor, having a certain inner space, and provided with a suction pipe SP for sucking refrigerant gas and a discharge pipe DP for discharging refrigerant gas compressed inside the compressor outwardly; a compressor body 70 disposed inside the casing 10 for compressing sucked refrigerant gas; and a supporting unit 60 for elastically connecting one surface of the body 70 and one surface of the casing 10 so that the body 70 can be fixed to the casing 10.

[4] The body 70 of the compressor includes: a frame unit 20 elastically connected to the supporting unit 60 and forming an entire frame of the body 70; a reciprocating motor 30 fixed to the frame unit 20 for generating a linear reciprocation force; and a compressing unit 40 supported at the frame unit 20 for compressing sucked refrigerant gas by the driving force of the reciprocating motor 30.

[5] The frame unit 20 includes: a front frame 21 of which one surface is supported by the supporting unit 60 and to which one surface of the reciprocating motor 30 is fixed; a middle frame 22 fixed to another surface of the reciprocating motor 30 fixed to the front frame 21; and a rear frame 23 of which one surface is elastically fixed by the supporting unit 60 and connected to the middle frame 22.

[6] The reciprocating motor 30 includes: an outer stator 31 fixedly-installed between the front frame 21 and the middle frame 22 and provided with a winding coil 34 therein; an inner stator 32 fixedly-installed at one side of the front frame 21 to face the outer stator 31 with a certain interval; and a mover 33 performing a linear motion between the outer stator 31 and the inner stator 32.

[7] The compressing unit 40 includes: a cylinder 41 insertion-fixed to inside of the front frame 21; a piston 42 having a refrigerant gas channel F therein, of which one end is connected to the mover 33, and reciprocated inside the cylinder 41; a suction valve 43 disposed at the front end surface of the piston 42 for opening and closing the refrigerant gas channel F; and a discharge valve assembly 44 disposed at one end surface of the cylinder 41 for restricting a discharge of compressed refrigerant gas. According to this, a compression space P is formed between the suction valve 43 and the discharge valve assembly 44.

[8] A front side resonant spring 51 and a rear side resonant spring 52 for inducing a resonant motion of the piston are respectively installed between one end of the piston 42 connected to the mover 33 and one end of the front frame 21 and between one end of the piston 42 connected to the mover 33 and one end of the rear frame.

[9] The supporting unit 60 is composed of: a front side supporting spring 61 for connecting the front frame 21 and one surface of the casing 10 so that the body 70 can be elastically fixed to inside of the casing 10; and a rear side supporting spring 62 for connecting the rear frame 23 and one surface of the casing 10.

[10] Operation of the conventional compressor will be explained as follows.

[11] When a current is applied to the winding coil 34 of the outer stator 31 of the reciprocating motor 30, an induction magnetic field of which direction is varied according to a current direction is formed at the outer stator 31. By an interaction between the induction magnetic field and a magnetic field of the inner stator 32, an electromagnetic force of which direction is varied according to a direction of the induction magnetic field is generated between the outer stator 31 and the inner stator 32. At this time, the mover 33 and the piston 42 move according to a direction of the electromagnetic force, and the piston 42 linearly reciprocates inside the cylinder by the front and rear resonant springs 51 and 52 thus to generate a pressure difference in the compression space P of the cylinder 41. According to this, refrigerant gas is sucked into the compressing space P, compressed, and discharged, which is repeated.

[12] Herein, the frame unit 20 of the compressor body 70 is elastically supported at the casing 10 by the front side supporting spring 61 and the rear side supporting spring 62.

[13] However, in the conventional reciprocating compressor, since the compressor body is elastically supported at the casing only by the front and rear side supporting springs, vibration generated from the compressor body is easily transmitted to the casing thus to increase an entire vibration amount of the compressor and noise. Disclosure

[14] Therefore, it is an object of the present invention to provide a reciprocating compressor having a vibration attenuating supporting unit for reducing vibration and noise generated at the time of driving a compressor.

[15] To achieve these objects, there is provided a compressor comprising: a casing having a predetermined inner space and provided with a suction pipe for sucking a fluid from outside and a discharge pipe for discharging a fluid to outside; a compressor body disposed inside the casing for compressing the fluid introduced through the suction pipe by a linear reciprocating of the piston and then discharging the compressed fluid through the discharge pipe; and a supporting unit that a plurality of elastic members and at least one mass body are alternately connected in order to absorb vibration generated from the compressor body, for supporting the compressor body at the casing.

Description of Drawings

[16] Figure 1 is a longitudinal section view showing a reciprocating compressor in accordance with the conventional art;

[17] Figure 2 is a longitudinal section view showing a reciprocating compressor according to the present invention;

[18] Figure 3 is a perspective view showing a supporting unit of a reciprocating compressor according to a first embodiment of the present invention;

[19] Figure 4 is a perspective view showing a supporting unit of a reciprocating compressor according to a second embodiment of the present invention;

[20] Figure 5 is a perspective view showing a supporting unit of a reciprocating compressor according to a third embodiment of the present invention;

[21] Figure 6 is a perspective view showing a supporting unit of a reciprocating compressor according to a fourth embodiment of the present invention; and

[22] Figure 7 is a schematic view showing an operation of the supporting unit of the reciprocating compressor according to the present invention.

Mode for Invention

[23] Hereinafter, a reciprocating compressor having a vibration attenuating supporting unit according to the present invention will be explained in more detail.

[24] Even if a plurality of embodiments can exist in the present invention, the most preferable embodiment will be explained.

[25] Figure 2 is a longitudinal section view showing a reciprocating compressor according to the present invention, Figure 3 is a perspective view showing a supporting unit of a reciprocating compressor according to a first embodiment of the present invention, and Figure 4 is a perspective view showing a supporting unit of a reciprocating compressor according to a second embodiment of the present invention.

[26] As shown in Figure 2, the reciprocating compressor according to the present invention comprises: a casing 200 forming an appearance of the compressor, having a certain inner space, and provided with a suction pipe SP for sucking refrigerant gas from outside and a discharge pipe DP for discharging refrigerant gas compressed inside the compressor outwardly; a compressor body 300 disposed inside the casing 200 for compressing sucked refrigerant gas; and a supporting unit 400 that a plurality of elastic members and at least one mass body are alternately connected in order to absorb vibration generated from the body 300, for supporting the compressor body 300 at the casing 200.

[27] The body 300 of the compressor includes: a frame unit 270 elastically connected to the supporting unit 400 and forming an entire frame of the body 300; a reciprocating motor 280 fixed to the frame unit 270; and a compressing unit 290 supported at the frame unit 270 for compressing sucked refrigerant gas by a linear motion of the reciprocating motor 280.

[28] The frame unit 270 includes: a front frame 271 of which one surface is supported by the supporting unit 400 and to which one surface of the reciprocating motor 280 is fixed; a middle frame 272 fixed to another surface of the reciprocating motor 271 fixed to the front frame 271; and a rear frame 273 of which one surface is elastically fixed by the supporting unit 400 and connected to the middle frame 272.

[29] The reciprocating motor 280 includes: an outer stator 281 fixedly-installed between the front frame 271 and the middle frame 272 and provided with a winding coil 284 therein; an inner stator 282 fixedly-installed at one side of the front frame 271 to face the outer stator 281 with a certain interval; and a mover 283 performing a linear motion between the outer stator 281 and the inner stator 282.

[30] The compressing unit 290 includes: a cylinder 291 insertion-fixed to inside of the front frame 271 ; a piston 292 having a refrigerant gas channel F therein, of which one end is connected to the mover 283, and reciprocated inside the cylinder 291; a suction valve 293 disposed at the front end surface of the piston 292 for opening and closing the refrigerant gas channel F; and a discharge valve assembly 294 disposed at one end surface of the cylinder 291 for restricting a discharge of compressed refrigerant gas. According to this, a compression space P is formed between the suction valve 293 and the discharge valve assembly 294. [31] A front side resonant spring 320 and a rear side resonant spring 321 for inducing a resonant motion of the piston 292 are respectively installed between one end of the piston 292 connected to the mover 283 and one end of the front frame 271 and between one end of the piston 292 connected to the mover 283 and one end of the rear frame 273.

[32] Even if a plurality of embodiments of the supporting unit 400 can exist, the most preferable embodiment thereof will be explained hereinafter.

[33] Figure 3 is a perspective view showing a supporting unit of a reciprocating compressor according to a first embodiment of the present invention.

[34] The supporting unit 400 is composed of: a plurality of first elastic members 410 fixed to one surface of the body 300 so that the body 300 can be supported at the casing 200; a plurality of second elastic members 420 fixed to one surface of the casing 200 to face the first elastic members 410; and a mass body 430 positioned between free ends of the plurality of first and second elastic members 410 and 420 and formed as a plate shape having a certain mass and an area, wherein the supporting unit 400 is constructed as a multiple-layer form that the first elastic members 410, the mass body 430, and the second elastic members 420 are alternately connected.

[35] The plurality of first elastic members 410 are preferably fixed to one surface of the front frame 271 and one surface of the rear frame 273.

[36] The plurality of first and second elastic members 410 and 420 are coupled to face each other on the same axis under a state that the mass body 430 is positioned therebetween. It is possible that the first and second elastic members 410 and 420 are fixed on the mass body 430 individually instead of being coupled to each other on the same axis thus to distribute vibration entirely.

[37] Elasticity coefficients of the plurality of first and second elastic members 410 and

420 can be varied according to positions that the first and second elastic members 410 and 420 are coupled to the mass body.

[38] The mass body 430 includes: a body portion 431 of a plate shape for insertion- fixing the plurality of first and second elastic members 410 and 420; and fixing protrusions 432 more than two formed at both surfaces of the body portion 431 for insertion-fixing free ends of the elastic members 410 and 420. That is, the number of the fixing protrusions 432 is determined according to the number of the elastic members 410 and 420. A position that the fixing protrusion 432 is formed can be freely varied according to a position that the elastic members 410 and 420 are coupled to the mass body 430. [39] The supporting unit of the reciprocating compressor according to the present invention can be implemented as second and third embodiments as shown in Figures 4 and 5.

[40] As shown in Figures 4 and 5, the supporting unit 400 of the reciprocating compressor according to the present invention includes: a plurality of first elastic members 410 symmetrically fixed to both sides of one surface of the body 300; a plurality of second elastic members 420 fixed to one surface of the casing 200 to face the first elastic members 410 on the same axis; and a pair of mass bodies 430 positioned between free ends of the division-aligned first and second elastic members 410 and 420 so that the body 300 can be division- supported at both sides of the casing 200.

[41] The pair of mass bodies 530 include: a body portion 533 of a plate shape having a certain thickness and area enough for the elastic members 410 and 420 to be couple- supported; and a plurality of fixing protrusions 532 formed at both surfaces of the body portion 533 so that the free ends of the elastic members 410 and 420 can be insertion- fixed to both surfaces of the mass body 530.

[42] As shown in the second embodiment of Figure 4, it is possible to arrange the pair of mass bodies 530 in a direction that the piston 292 is linearly-reciprocated. Also, as shown in the third embodiment of Figure 5, it is possible to arrange the pair of mass bodies 530 in a vertical direction to a direction that the piston 292 is linearly-reciprocated. The arrows of Figures 4 and 5 indicates a motion direction of the piston.

[43] Figure 6 is a perspective view showing a supporting unit of a reciprocating compressor according to a fourth embodiment of the present invention.

[44] In the supporting unit 400 of the reciprocating compressor according to the fourth embodiment, a plurality of mass bodies 630 are individually disposed between a pair of elastic members so that the only a pair of first and second elastic members 410 and 420 can be coupled independently. In this case, the plurality of mass bodies 630 also have an area enough to support the elastic members 410 and 420 of both sides. A fixing protrusion 632 for insertion-fixing the elastic members 410 and 420 is preferably formed at both surfaces thereof.

[45] The plurality of first and second elastic members are preferably formed of compression springs, but other elastic materials can be used.

[46] The supporting unit 400 of the reciprocating body according to the present invention can be composed of plural layers more than three layers including: a plurality of first elastic members 410 fixed to the compressor body 300; mass bodies 430, 530, and 630 connected to free ends of the first elastic members 410; and a plurality of elastic members 420 connected to the mass bodies 430, 530, and 630. That is, it is possible to add other plurality of elastic members and mass bodies between the plurality of first elastic members 410 and the mass bodies 430, 530, and 630 and thereby much more elastic members and mass bodies can be alternately connected.

[47] The supporting unit according to the present invention can be applied not only to a reciprocating compressor but also to another kind of compressor.

[48] Operation of the reciprocating compressor having a vibration attenuating supporting unit according to the present invention will be explained as follows.

[49] When a current is applied to the winding coil 284 of the outer stator 281 of the reciprocating motor 280, an induction magnetic field of which direction is varied according to a current direction is formed at the outer stator 281. By an interaction between the induction magnetic field and a magnetic field of the inner stator 282, an electromagnetic force of which direction is varied according to a direction of the induction magnetic field is generated between the outer stator 281 and the inner stator 282. At this time, the mover 283 and the piston 292 move together according to a direction of the electromagnetic force, and the piston 292 linearly reciprocates inside the cylinder 291 by the front and rear resonant springs 320 and 321 thus to generate a pressure difference in the compression space P of the cylinder 291. According to this, refrigerant gas is sucked into the compressing space P, compressed, and discharged, which is repeated. While the piston is reciprocated by the reciprocating motor and refrigerant gas sicked into the cylinder is compressed thus to be discharged, vibration is generated in the compressor body. The generated vibration is transmitted to the casing 200 by the supporting unit 400 that the plurality of elastic members and the mass bodies are alternately connected. At this time, the mass bodies of the supporting unit 400 is vibrated between the plurality of elastic members thus to absorb vibration generated from the compressor body 300, thereby attenuating vibration generated from the body and transmitted to the casing.

[50] In the reciprocating compressor according to the present invention, the supporting unit that a plurality of elastic members and at least one mass body are alternately connected for supporting the compressor body at the casing is provided to absorb vibration generated from the compressor body. According to this, an amount of vibration transmitted from the compressor body to the casing can be reduced, and vibration and noise generated from a system such as a refrigerator and an air conditioner to which the compressor of the present invention is applied can be greatly reduced. [51] It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

[1] A reciprocating compressor comprising: a casing having a predetermined inner space and provided with a suction pipe for sucking a fluid from outside and a discharge pipe for discharging a fluid to outside; a compressor body disposed inside the casing for compressing the fluid introduced through the suction pipe by a linear reciprocating of the piston and then discharging the compressed fluid through the discharge pipe; and a supporting unit that a plurality of elastic members and at least one mass body are alternately connected in order to absorb vibration generated from the compressor body, for supporting the compressor body at the casing.

[2] The reciprocating compressor of claim 1, wherein the supporting unit includes: a plurality of first elastic members fixed to one surface of the body; a plurality of second elastic members fixed to one surface of the casing to face the first elastic members; and a mass body positioned between free ends of the plurality of first and second elastic members and coupled to the first and second elastic members with a plate shape.

[3] The reciprocating compressor of claim 2, wherein other plurality of elastic members and mass bodies are additionally connected between the plurality of first elastic members and the mass body.

[4] The reciprocating compressor 1, wherein the elastic members of the supporting unit are compression springs.

[5] The reciprocating compressor of claim 1, wherein the mass body includes: a body portion having a certain thickness and area of a plate shape; and at least one fixing protrusion respectively formed at both surfaces of the body portion for insertion-fixing the plurality of elastic members.

[6] The reciprocating compressor of claim 1, wherein the supporting unit includes: a plurality of first elastic members symmetrically fixed to both sides of one surface of the body by being division- aligned with a certain number; a plurality of second elastic members fixed to one surface of the casing to face the first elastic members; and a pair of mass bodies respectively positioned between free ends of the division- aligned first and second elastic members so that the compressor body can be division-supported at both sides of the casing. [7] The reciprocating compressor of claim 6, wherein said the pair of mass bodies are arranged in a direction that the piston is linearly-reciprocated. [8] The reciprocating compressor of claim 6, wherein said the pair of mass bodies are arranged in a direction perpendicular to a direction that the piston is linearly- reciprocated. [9] The reciprocating compressor of claim 6, further comprising a plurality of elastic members and mass bodies between the free ends of the division-aligned plurality of elastic members and said the pair of mass bodies. [10] The reciprocating compressor of claim 1, wherein the supporting unit includes: a plurality of first elastic members fixed to one surface of the body; a plurality of second elastic members fixed to one surface of the casing to face the first elastic members; and a plurality of mass bodies positioned between the first and second elastic members so that free ends of the first elastic members and free ends of the second elastic members can be individually connected. [11] The reciprocating compressor of claim 10, further comprising a plurality of elastic members and mass bodies between the free ends of the plurality of first elastic members and the plurality of mass bodies.