CN101881275A

CN101881275A - Rotary compressor

Info

Publication number: CN101881275A
Application number: CN2009103021719A
Authority: CN
Inventors: 邢文君
Original assignee: LG Electronics Tianjin Appliances Co Ltd
Current assignee: LG Electronics Tianjin Appliances Co Ltd
Priority date: 2009-05-08
Filing date: 2009-05-08
Publication date: 2010-11-10

Abstract

The invention discloses a rotary compressor, which comprises a stator and a rotor, wherein the stator and the rotor are arranged in a machine case, the center of the rotor is pressed in and arranged on a crank shaft, the lower part of the crank shaft is provided with a compression structure part, the compression structure part comprises an air cylinder, an upper bearing, a lower bearing and a rotary piston, the air cylinder is fixedly arranged on the inner peripheral surface of the machine case, the upper bearing and the lower bearing are tightly pasted on the upper side surface and the lower side surface of the air cylinder, the rotary piston is arranged on an eccentric part of the crank shaft, and does eccentric rotation in the air cylinder under the effect of the crank shaft, the crank shaft comprises a long shaft, the eccentric part and a short shaft, and a support device using magnetic force for supporting the crank shaft is arranged between the lower end of the short shaft and a lower cover of the compressor. Because the lower end of the short shaft of the lower bearing is provided with an annular magnet, a caged magnet is correspondingly and fixedly arranged at the bottom of the lower cover of the compressor, and the homopolar poles of the annular magnet and the caged magnet are opposite to each other and generate repulsion force, the friction between the crank shaft and the lower bearing is reduced.

Description

Rotary compressor

Technical field

The present invention relates to compressor field, particularly relate to a kind of rotary compressor.

Background technique

The rotary compressor that is applicable to air conditioner etc. usually with bent axle that electric structure portion combines on eccentric rotary-piston in conjunction with compression structure part, rotary-piston is rotated motion in the compression volume of circular cylinder, thus suction, compression and discharging refrigerant.

The structure of existing rotary compressor as shown in Figure 1, its electric structure portion comprises: stator 2, rotor 3 and bent axle 4.Stator 2 and rotor 3 are arranged on the inside of casing 1, and the center of rotor 3 is pressed into and is installed on the bent axle 4, and the bottom of bent axle 4 is provided with the compression structure part of suction, compression refrigeration gas.Described compression structure part comprises: the circular cylinder 5 that is fixedly installed on casing 1 inner peripheral surface; The upper and lower bi-side while bent axle 4 that is close to cylinder 5 connects wherein and supported upper bearing (metal) 6A and lower bearing 6B; Be arranged on the eccentric part 4a of bent axle 4, at the rotary-piston 7 that off-centre is rotated in cylinder 5 under the effect of bent axle 4; One end is crimped on the outer circumferential face of rotary-piston 7, the other end contacts with baffle plate spring (not shown), and is rotated that motion the time is done straight line motion and cylinder 5 is divided into the baffle plate 11 of breathing space and compression volume and is arranged on a side of casing 1 and is connected gas-liquid separator 10 on the suction port of cylinder 5 at rotary-piston 7.

The working procedure of above-mentioned existing rotary compressor is as follows:

Give stator 2 power supplies, make the inner rotation of rotor 3 at stator 2, meanwhile bent axle 4 rotates and rotary-piston 7 off-centre in cylinder 5 is rotated, off-centre rotation along with rotary-piston 7, refrigeration agent is inhaled into the breathing space of cylinder 5, and continue to be compressed to certain pressure, when the pressure in the compression volume of cylinder 5 surpasses critical pressure, the drain tap 8 that is installed on the relief opening of upper bearing (metal) 6A is opened, pressurized gas drains in the casing 1 from compression volume, the gas of discharging enters into the top of rotary compressor by the slit between the slit between casing 1 and the stator 2 or stator 2 and the rotor 3, passes through gas outlet pipe DP then and is discharged to the circulating frozen system.

But existing rotary compressor has following shortcoming:

Existing rotary compressor, under the effect of himself gravity, the serious wear between bent axle and the lower bearing, thus reduced the reliability of compressor.

Summary of the invention

The object of the present invention is to provide a kind of at the bent axle minor axis the lower end and the lower cover of compressor between the support device that utilizes magnetic force to support bent axle is set, thereby reduce friction between bent axle and the lower bearing, improve the rotary compressor of compressor reliability.

To achieve these goals, technological scheme of the present invention is as follows:

A kind of rotary compressor, comprise the stator that is arranged in the casing, rotor, centre of rotor is pressed into and is installed on the bent axle, the bottom of bent axle is provided with compression structure part, described compression structure part comprises: the cylinder that is fixedly installed on the casing inner peripheral surface, be close to cylinder on, the upper bearing (metal) of following bi-side and lower bearing, be arranged on the eccentric part of bent axle, the rotary-piston that off-centre is rotated in cylinder under the effect of bent axle, described bent axle comprises major axis, eccentric part and minor axis are provided with the support device that utilizes magnetic force to support bent axle between the lower cover of the lower end of described minor axis and compressor.

Above-mentioned support device is made up of the magnetite of lower end that is separately fixed at described bent axle minor axis and the inboard bottom of housing lower cover, and the homopolarity of two magnetites is relative.

The above-mentioned magnetite that is fixed on bent axle minor axis lower end is annular magnetite, and the described magnetite that is fixed on the inboard bottom of housing lower cover is the cage mounted magnetite.

Above-mentioned cage mounted magnetite is by upper, annular magnetite, lower annular magnetite and be vertically set between the upper and lower two annular magnetites and a plurality of cylindrical magnetite that is provided with is at interval formed along circumference.

Rotary compressor of the present invention, an annular magnetite is installed in minor axis lower end at lower bearing, corresponding fixedly loads onto a cage mounted magnetite in compressor lower cover bottom, make annular magnetite relative with cage mounted magnetite homopolarity, for example N is extremely relative, or S is extremely relative, make to produce repulsion between the two, thus the friction of minimizing bent axle and lower bearing.In addition, the cage mounted magnetite does not only influence the fuel delivery of pump, makes the pump can proper functioning, the iron filings that wearing and tearing in the running produce can also be adsorbed on the magnetite, prevents to cause bigger wearing and tearing, thereby makes the reliability of compressor obtain very big improvement.

Description of drawings

Fig. 1 is the longitudinal sectional drawing of existing rotary compressor;

Fig. 2 is the longitudinal sectional drawing of rotary compressor of the present invention;

Fig. 3 is the decomposition texture schematic representation of lower bearing and magnetite in the rotary compressor of Fig. 2.

Embodiment

Be elaborated below in conjunction with the structure of accompanying drawing to rotary compressor of the present invention.

Referring to Fig. 2, rotary compressor of the present invention comprises: be arranged on stator 22, rotor 23 and bent axle 24 in the housing 21.The center of rotor 23 is pressed into and is installed on the bent axle 24, and the bottom of bent axle 24 is provided with the compression structure part of suction, compression refrigeration gas.Described compression structure part comprises: the circular cylinder 25 that is fixedly installed on casing 21 inner peripheral surfaces; The upper and lower bi-side while bent axle 24 that is close to cylinder 25 connects wherein and supported upper bearing (metal) 26A and lower bearing 26B; Be arranged on the eccentric part 24a of bent axle 24, at the rotary-piston 27 that off-centre is rotated in cylinder 25 under the effect of bent axle 24; One end is crimped on the outer circumferential face of rotary-piston 27, the other end contacts with baffle plate spring (not shown), and is rotated that motion the time is done straight line motion and cylinder 25 is divided into the baffle plate 31 of breathing space and compression volume and is arranged on a side of casing 21 and is connected gas-liquid separator 20 on the suction port of cylinder 25 at rotary-piston 27.

Described 24 bent axles comprise major axis, eccentric part 24a and minor axis 24b, are provided with the support device that utilizes magnetic force to support bent axle between the lower cover 21a of the lower end of minor axis 24b and compressor.In detail, described support device is made up of the magnetite of the inboard bottom of lower cover 21a of 24b lower end that is fixedly mounted on described bent axle minor axis respectively and housing 21.Referring to Fig. 3, the magnetite that is fixed on bent axle minor axis 24b lower end is annular magnetite 30, and the magnetite that is fixed on the inboard bottom of housing lower cover 21a is a cage mounted magnetite 31, and annular magnetite 30 is relative with the homopolarity of cage mounted magnetite 31, promptly the N of two magnetites extremely relatively or S extremely relative.Cage mounted magnetite 31 is formed by upper, annular magnetite 31a, lower annular magnetite 31b with along a plurality of cylindrical magnetite 31c that circumference is vertically set between upper and lower two annular magnetite 31a, the 31b and the interval is provided with.

Working procedure to rotary compressor of the present invention is as follows below:

Give stator 22 power supplies, make the inner rotation of rotor 23 at stator 22, meanwhile bent axle 24 rotates and rotary-piston 27 off-centre in cylinder 25 is rotated, off-centre rotation along with rotary-piston 27, refrigeration agent is inhaled into the breathing space of cylinder 25, and continue to be compressed to certain pressure, when the pressure in the compression volume of cylinder 25 surpasses critical pressure, the drain tap that is installed on the relief opening of upper bearing (metal) 26A is opened, pressurized gas drains in the casing 21 from compression volume, the gas of discharging enters into the top of rotary compressor by the slit between the slit between casing 21 and the stator 22 or stator 22 and the rotor 23, passes through gas outlet pipe DP then and is discharged to the circulating frozen system.

Since annular magnetite 30 and cage mounted magnetite 31 homopolarity relative, so produce repulsion between the two, under the effect of this repulsion, the power that bent axle 24 acts on the lower bearing 26B reduces, thereby reduced the friction between the lower bearing 26B of bent axle 24, reduced the wearing and tearing between the two.Simultaneously, owing to form the slit between a plurality of cylindrical magnetite 31c of cage mounted magnetite 31, so in the running of compressor, can not influence lubricated oil supplying.

Claims

1. rotary compressor, comprise the stator that is arranged in the casing, rotor, centre of rotor is pressed into and is installed on the bent axle, the bottom of bent axle is provided with compression structure part, described compression structure part comprises: the cylinder that is fixedly installed on the casing inner peripheral surface, be close to cylinder on, the upper bearing (metal) of following bi-side and lower bearing, be arranged on the eccentric part of bent axle, the rotary-piston that off-centre is rotated in cylinder under the effect of bent axle, described bent axle comprises major axis, eccentric part and minor axis is characterized in that: be provided with the support device that utilizes magnetic force to support bent axle between the lower cover of the lower end of described minor axis and compressor.

2. rotary compressor according to claim 1 is characterized in that: described support device is made up of the magnetite of lower end that is separately fixed at described bent axle minor axis and the inboard bottom of housing lower cover, and the homopolarity of two magnetites is relative.

3. rotary compressor according to claim 2 is characterized in that: the described magnetite that is fixed on bent axle minor axis lower end is annular magnetite, and the described magnetite that is fixed on the inboard bottom of housing lower cover is the cage mounted magnetite.

4. rotary compressor according to claim 3 is characterized in that: described cage mounted magnetite is by upper, annular magnetite, lower annular magnetite and be vertically set between the upper and lower two annular magnetites and a plurality of cylindrical magnetite that is provided with is at interval formed along circumference.