CN1715678A

CN1715678A - Gas leakage reducing structure for rotary compressor

Info

Publication number: CN1715678A
Application number: CN 200410019814
Authority: CN
Inventors: 赵承衍
Original assignee: LG Electronics Tianjin Appliances Co Ltd
Current assignee: LG Electronics Tianjin Appliances Co Ltd
Priority date: 2004-06-28
Filing date: 2004-06-28
Publication date: 2006-01-04

Abstract

The present invention provides a kind of gas leakage reducing structure for rotary compressor. On the outer cylindrical surface of rolling piston, notch is formed for the head of blade to be inserted in, so that the blade and the rolling piston are surface contacted to increase the sealing area, to avoid the leakage of the refrigerant gas from the compression area to the sucking area and to raise the efficiency of the compressor.

Description

The reduction gas leakage structure of rotary compressor

Technical field

The present invention relates to a kind of reduction gas leakage structure (STRUCTURE FORREDUCING GAS LEAKAGE OF ROTARY COMPRESSOR) of rotary compressor, be particularly related to and a kind ofly on the outer cylinder of rolling piston, groove be set, prevent that thus the gas leakage of the rotary compressor of the gas leakage between rolling piston and the blade from reducing structure.

Background technique

Usually, rotary compressor with rotating shaft that motor drive mechanism combines on the eccentric rolling piston that is provided with compressing mechanism, rolling piston rotates in the cylinder interior space of circle thus, absorbs compression and output refrigeration agent.Fig. 1 is the sectional drawing of rotary compressor example in the past, and Fig. 2 is in rotary compressor in the past, and the ground plan of the leakage process of refrigerant gas is described.

As shown in the figure, comprise in the rotary compressor in the past: a certain amount of machine oil of packing into, the casing 1 that is connected and communicates with outlet pipe DP with sucking pipe SP; Be arranged on the top of casing, the motor drive mechanism of rotating force is provided; Be arranged on the bottom of casing, utilize the compressing mechanism of the rotating force compressed refrigerant of motor drive mechanism generation to constitute.

Motor drive mechanism comprises: be fixed on the stator Ms that the inside of casing 1 is connected with external power supply; Inside at stator Ms is arranged at a distance of certain space, is constituting with the interactional rotor Mr that is rotated motion simultaneously of described stator Ms.

Compressing mechanism comprises: adopt loop configuration, be arranged on the cylinder 2 of casing 1 inside; Cover the both sides up and down of cylinder 2, together constitute main bearing 3 and the auxiliary bearing 4 of inner space V; Be pressed in the rotor 2, support, transmit the rotating shaft 5 of rotating force by main bearing 3 and auxiliary bearing 4; Be arranged on the eccentric structure of rotating shaft 5 rolling piston 6 of compressed refrigerant in the rotation of the inner space of cylinder 2 rotationally; For the outer cylinder with rolling piston 6 joins, radially can be arranged on movably on the cylinder 2, the inner space V of described cylinder 2 is divided into the blade 7 of suction chamber and pressing chamber; But the delivery outlet 3a head end that is equipped with on the middle position that is arranged on main bearing 3 of switch, the output valve assembly 8 that the refrigerant gas of exporting for pressing chamber limits; Possessed the resonant chamber that can hold output valve assembly 8, the silencing apparatus 9 that is arranged on the outer side surface of auxiliary bearing 4 constitutes.

Cylinder 2 carries out relative movement in order to make described rolling piston 6, adopt the structure of annular, its side is provided with the groove 2a that makes described blade 7 do the radial alignment motion, connect the relief opening 3a of described main bearing 3, the output steering channel 2c of guiding refrigerant gas output at the opposite side of groove and be provided with when radially running through the suction port 2b that connects sucking pipe SP in the side of groove 2a.

Rolling bearing 6 adopts the level and smooth loop configuration of outer cylinder, and sliding is inserted on the eccentric structure of rotating shaft 5.

Blade 7 adopts the Square consisting of two isosceles right-angled triangles structures, and by leaf spring S elastic support, and the inside end that itself and described rolling bearing 6 outer cylinders join has formed the curved-surface structure 7a with certain curvature in the inside of described groove 2a.

There is not the symbol 9a of explanation to represent delivery outlet among the figure.

As above the working procedure of the rotary compressor in the past of Gou Chenging is as follows.

That is, after the stator Ms of the motor drive mechanism energising, when rotor Mr began to rotate, the rotating shaft 5 of compressing mechanism was rotated with rotor Mr.At this moment, described rolling piston 6 carries out the off-centre rotation in the V of the inner space of cylinder 2, refrigerator gas is sucked into the inside of suction chamber thus, be compressed continuously, the moment of the pressure in the pressure of pressing chamber surpasses casing 1, export casing 1 inside to by relief opening 3a on the main bearing 3 and silencing apparatus 9.

Here, described rolling piston 6 is carrying out being rotated motion in the autobiography motion with the eccentric structure of rotating shaft 5 within several angle (haply about ± 60 °) scope of cylinder 2 inside, thus in the inside of groove 2a, described blade 7 with the column jacket upper thread state of contact of rolling piston 6 under, do the radial alignment motion, thereby the inner space V of cylinder 2 is divided into suction zone and constricted zone.

But, in the rotary compressor in the past that as above constitutes, because the outer cylinder of rolling piston 6 adopts level and smooth structure, and the head of blade 7 forms the curved-surface structure 7a with certain curvature, rolling piston 6 carries out line with blade 7 and contacts thus, but carrying out along with compression stroke, the pressure of constricted zone will increase gradually, exposed portions serve on the blade 7 is under the effect of gas pressure thus, slight bending takes place, thereby produce small slit between blade 7 and the rolling piston 6, cause refrigerant gas to leak.

Summary of the invention

In order to solve above problem, the purpose of this invention is to provide a kind of reduction gas leakage structure of rotary compressor, it can reduce the leakage of the refrigerant gas that produces between rolling piston outer cylinder and the tangent with it blade.

To achieve these goals, the present invention is comprising: the circular cylinder that is fixedly installed on casing inside; A side that covers cylinder together constitutes the inner space, but the rotating shaft that combines with drive motor runs through the axis hole that the back forms the radial support rotating shaft, and be provided with the inner space of cylinder in the side of axis hole and communicate, thus refrigerant gas is exported to the main bearing of the relief opening of casing inside; Another side that covers cylinder together constitutes the inner space, but has formed the auxiliary bearing of the axis hole of radial support rotating shaft after rotating shaft runs through; Be arranged on rotationally on the eccentric structure of rotating shaft in the inside of cylinder, when carrying out eccentric rotation, transfer the rolling piston of refrigerant gas; Be arranged between the suction port and delivery outlet of cylinder, when carrying out the off-centre rotation, rolling piston carries out the radial alignment motion, stop thus in the rotary compressor that the blade of refrigerant gas constitutes that being provided at and having formed the groove that inserts leaf head on the outer cylinder of rolling piston is that the gas leakage of the rotary compressor of feature reduces structure.

The gas leakage of rotary compressor of the present invention reduces structure, on the rolling piston outer cylinder that contacts with blade, be provided with groove, making blade and rolling piston carry out face contacts, increased the shutoff area, avoid the refrigerant gas leakage in the constricted zone to enter the suction zone thus, thereby improved the efficient of compressor.

Description of drawings

Fig. 1 is the sectional drawing of rotary compressor example in the past;

Fig. 2 is in rotary compressor in the past, and the ground plan of the leakage process of refrigerant gas is described;

Fig. 3 is an oblique drawing of observing rotary compressor of the present invention part in the bottom surface;

Fig. 4 is the sketch of the correlation between rolling bearing and the blade in the expression rotary compressor of the present invention;

Fig. 5 expresses the detail drawing that cuts off freezing medium leakage in the compressor of the present invention.

The critical piece description of reference numerals

2: cylinder 2a: groove

2b: suction port 2c: delivery outlet

3: main bearing 3a: relief opening

4: auxiliary bearing 5: rotating shaft

7: blade 7a: curved-surface structure

10: rolling piston 11: groove

Embodiment

Below, the gas leakage of the explanation rotary compressor of the present invention that the embodiment in is detailed in conjunction with the accompanying drawings reduces structure.

Fig. 3 is an oblique drawing of observing rotary compressor of the present invention part in the bottom surface, Fig. 4 is the sketch of the correlation between rolling bearing and the blade in the expression rotary compressor of the present invention, and Fig. 5 expresses the detail drawing that cuts off freezing medium leakage in the compressor of the present invention.

As shown in the figure, comprise in the rotary compressor of the present invention: the casing 1 that communicates with sucking pipe SP and outlet pipe DP; Be arranged on casing 1 inside, constitute the motor drive mechanism that produces rotating force by stator Ms and rotor Mr; Combine with the rotor Mr of motor drive mechanism, utilize its rotating force to suck, the compressing mechanism of compression and output refrigerant gas.

Compressing mechanism comprises: the cylinder 2 that is arranged on casing 1 inside; Cover the both sides up and down of cylinder 2, together constitute main bearing 3 and the auxiliary bearing 4 of inner space V; Be pressed in the rotor Mr, support, transmit the rotating shaft 5 of rotating force by main bearing 3 and auxiliary bearing 4; Be arranged on the eccentric structure of rotating shaft 5 rolling piston 10 of compressed refrigerant in the rotation of the inner space of cylinder 2 rotationally; For the outer cylinder with rolling piston 10 joins, radially can be arranged on movably on the cylinder 2, the inner space V of described cylinder 2 is divided into the blade 7 of suction chamber and pressing chamber; But near the delivery outlet 3a head end that is equipped with the middle position that is arranged on main bearing 3 of switch, the output valve assembly 8 that the refrigerant gas of exporting for pressing chamber limits; Possessed the resonant chamber that can hold output valve assembly 8, the silencing apparatus 9 that is arranged on the outer side surface of main bearing 3 constitutes.

Cylinder 2 carries out relative movement in order to make described rolling piston 10, adopt the structure of annular, its side is provided with the groove 2a that makes described blade 7 do the radial alignment motion, connect the relief opening 3a of described main bearing 3, the output steering channel 2c of guiding refrigerant gas output at the opposite side of groove and be provided with when radially running through the suction port 2b that connects sucking pipe SP in the side of groove 2a.

Rolling piston 10 adopts the loop configuration of outer cylinder slyness as shown in Figure 3 and Figure 4, and sliding in a circumferential direction is inserted on the eccentric structure of rotating shaft 5, and axially is provided with long groove 11 in its outer cylinder with on the tangent position of blade 7.Described groove 11 has certain degree of depth.

Groove 11 adopts curved-surface structure, when carrying out plane projection, form semicircular structure thus, and in order to increase the area of contact with blade 7, the curvature of its curved-surface structure preferably curvature with spoon of blade structure 7a is identical, but carry out smooth rotatablely moving in order to ensure rolling bearing 10, the curvature of its curved-surface structure can be greater than the curvature of blade 7 curved-surface structure 7a.

Blade 7 adopts the Square consisting of two isosceles right-angled triangles structures, and by leaf spring S elastic support, and the inside end that itself and described rolling bearing 6 outer cylinders join is provided with the curved-surface structure 7a of protrusion with certain curvature in the inside of described groove 2a.

Used identical symbol with identical in the past part among the figure.

The rotary compressor gas leakage of the present invention that as above constitutes reduces structure and has following effect.

That is, after the stator Ms of the motor drive mechanism energising, when rotor Mr began to rotate, the rotating shaft 5 of compressing mechanism was rotated with rotor Mr.At this moment, described rolling piston 6 carries out the off-centre rotation in the inner space of cylinder 2, refrigerator gas is sucked into the inside of the suction chamber of cylinder 2 thus, be compressed continuously, when the pressure of the pressing chamber of cylinder 2 surpasses moment of the pressure in the casing 1, export casing 1 inside to by relief opening 3a and silencing apparatus 9.

At this moment, rolling bearing 10 rotations cause the pressure of constricted zone to increase, might produce slight gap between the blade 7, therefore among the present invention as shown in Figure 5, on rolling piston 10 outer cylinders, be provided with groove 11, make thus and carry out the face contact between rolling piston 10 and the blade 7, thereby not only increased the shutoff area of rolling piston 10 and blade 7, and inboard slight when crooked at blade 7, avoided breaking away from fully rolling piston 10, prevented the leakage of refrigerant gas thus.And, suppressed because blade 7 inside bend that the relative friction of rolling piston 10 and blade 7 causes the more effective thus leakage of avoiding refrigerant gas.

Claims

1, a kind of gas leakage of rotary compressor reduces structure, is arranged in the rotary compressor that comprises following parts: the circular cylinder that is fixedly installed on casing inside; A side that covers cylinder together constitutes the inner space, but the rotating shaft that combines with drive motor runs through the axis hole that the back forms the radial support rotating shaft, and be provided with identically with the inner space of cylinder in the side of axis hole, thus refrigerant gas is exported to the main bearing of the relief opening of casing inside; Another side that covers cylinder together constitutes the inner space, but has formed the auxiliary bearing of the axis hole of radial support rotating shaft after rotating shaft runs through; Be arranged on rotationally on the eccentric structure of rotating shaft in the inside of cylinder, when carrying out eccentric rotation, transfer the rolling piston of refrigerant gas; Be arranged between the suction port and delivery outlet of cylinder, when rolling piston carries out the off-centre rotation, carry out the radial alignment motion, stop the blade of refrigerant gas thus, it is characterized in that:

On the outer cylinder of rolling piston, formed the groove that inserts leaf head.

2, the gas leakage of rotary compressor according to claim 1 reduction structure is characterized in that: leaf head adopts the curved-surface structure with certain curvature, and groove contacts in order to carry out face with described leaf head, adopts identical curvature to form curved-surface structure haply.