CN2553140Y

CN2553140Y - Axial sealing mechanism for vortex compressor

Info

Publication number: CN2553140Y
Application number: CN 02221114
Authority: CN
Inventors: 钱永贵
Original assignee: 钱永贵
Current assignee: Nanjing Aotecar Refrigerating Co., Ltd.
Priority date: 2002-06-10
Filing date: 2002-06-10
Publication date: 2003-05-28
Anticipated expiration: 2012-06-10

Abstract

The utility model relates to an axial sealing member on the top scroll body of scroll compressor, which is characterized in that the a flat-bottom groove is arranged on the top surface of the scroll bodies of a dynamic scroll disk and a static scroll disk corresponding to the position of initial pressure of a high-pressure area; a scroll sealing strip matched with the groove is arranged in the groove on the top surface of the scroll body correspondingly; the scroll sealing strip is glidingly fitted with the groove; a plurality of small slots arrayed at intervals on the bottom surface in corresponding groove of the scroll seal strip in the direction vertical to the scroll line, or, a plurality of shallow recesses are arranged at intervals on the bottom surface of the scroll sealing strip. The utility model has the advantages that a new sealing strip is used to substitute the floating axial sealing member of ordinary sealing strip, thereby leakage of air through bypass channel is reduced, volumetric efficiency is improved and manufacturing cost can be reduced without improving precision requirements of parts.

Description

The axial seal mechanism of scroll compressor

Technical field

The utility model belongs to the scroll machine technical field of sealing technology, and the vortex body top axle that further belongs to a kind of scroll compressor is to sealing mechanism.

Background technique

The leakage of gas in the scroll compressor compression chamber directly produces significant impact to the machine volumetric efficiency.The compression chamber of scroll compressor is formed together by dynamic and static two scroll assemblings in interleaved relation with each other, and these two scroll radial offset also keep 180 degree phase differences.Fig. 1 is two scroll assembling schematic representation.

Can see that by Fig. 1 compression chamber is surrounded by the sidewall of the vortex body 12 of two

scroll

1 and 2 and 22 and

end plate inwall

11 and 21 and forms.During compressor operating, the gas compression chamber is constantly moved and is simultaneously reduced volume gradually from the periphery to the center, and gas in the chamber is compressed.

In the compressor operation, gas has two leakage ways in the compression chamber: one is the leakage way that the radial clearance that may exist between the two vortex body engagement place sidewalls forms; Another is the vortex body end face and the leakage way that axial clearance forms between the scroll end plate inwall that is complementary.Its width is identical with vortex body height and vortex body involute-type line length respectively, because latter's width is than the big several times of the former width, thereby the axial seal of scroll compressor compression chamber more should be paid attention to.

The radial leakage that minimizing vortex body top axial clearance causes can adopt two kinds of methods: one, improve the machining accuracy and the assembly precision of two scroll, guarantee that axial clearance keeps micron order numerical value; Two, adopt axial seal mechanism shown in Figure 2, in the groove 13 that vortex body 12 end faces of scroll 1 go out, lay Stamping Steel Ribbon 3, in the groove 23 that vortex body 22 end faces of scroll 2 mill out, lay Stamping Steel Ribbon 4.Stamping Steel Ribbon 3 is fitted with the bottom surface and the scroll end plate inwall 21 of groove 13, and Stamping Steel Ribbon 4 is fitted with the bottom surface and the scroll end plate inwall 11 of groove 23, just blocks gas and radially leaks by axial clearance.

Adopt first method, processing cost enlarges markedly, and leaks also to be difficult to really avoid.Adopt second method, sealing surface is fitted tighter, and friction power loss is big during operation, and Stamping Steel Ribbon is wear out failure too early.

For addressing this problem, a kind of axial seal mechanism of laying the floating seal bar is used widely in scroll compressor at present, and it as shown in Figure 3.In this mechanism, Stamping

Steel Ribbon

3 and 4 radial width be respectively less than the width of

groove

13 and 23, and their axial height is respectively less than the distance of groove 13 bottom surfaces to the distance of end plate inwall 21 and groove 23 bottom surfaces to end plate inwall 11.Two Stamping Steel Ribbons can float within the specific limits.During compressor operating, Stamping Steel Ribbon 3 is fitted with end plate inwall 21 and groove 13 sidewalls respectively, Stamping Steel Ribbon 4 is fitted with end plate inwall 11 and groove 23 sidewalls respectively, adopt this sealing mechanism, by general machining tolerance is may command vortex body height and axial clearance, and friction power loss is little during compressor operating.But during with conventional Stamping Steel Ribbon, two vortex body engagement places can form bypass leakage way as shown in Figure 4 around the Stamping Steel Ribbon at sealing mechanism.Among Fig. 4, radial clearance when a is

vortex body

12 and 22 engagements between the sidewall, b is the cross section of the bypass passageways of Stamping Steel Ribbon 3 and groove 13, end plate inwall 21 and the formation of vortex body 22 sidewalls, gas will tangentially leak through gap a and b, the leakage rate of bypass passageways b may be bigger, must be paid attention to.Reduce the gap of 21 of the end face of vortex body 12 and end plate inwalls, can significantly reduce the sectional area of bypass passageways, but this increases the processing cost of part such as scroll again, and the advantage of this mechanism has not been existed.

Summary of the invention

The purpose of this utility model is exactly in order to address the above problem, and provides a kind of reducing to leak, and improves the axial seal mechanism of the scroll compressor of machine volumetric efficiency.

Technical solution of the present utility model:

A kind of axial seal mechanism of scroll compressor, it has flat groove in the position that the top end surface correspondence of moving scroll and fixed scroll vortex body just is pressed in the zone of high pressure, correspondingly in the groove of vortex body top end surface, be equipped with the vortex Stamping Steel Ribbon that matches, between them for being slidingly matched, the bottom surface that is positioned at respective grooves that it is characterized in that described vortex Stamping Steel Ribbon have spaced and with the little groove of the perpendicular direction of vortex filament, perhaps, be interval with the scrobicula cave in the bottom surface of vortex Stamping Steel Ribbon.

The utility model proposes a floating type axial seal mechanism that replaces conventional Stamping Steel Ribbon with the novel seal bar, make scroll compressor not improve under the element precision requirement prerequisite, reduce the leakage of gas, improve the volumetric efficiency of machine, also can reduce the processing cost of machine simultaneously through bypass passageways.

Description of drawings

Fig. 1 is two whirlpool dish package assembly schematic representation.

Fig. 2 is that Stamping Steel Ribbon can not axially movable axial seal structural scheme of mechanism.

Fig. 3 is the relocatable axial seal structural scheme of mechanism of Stamping Steel Ribbon.

Fig. 4 is the schematic cross-section of vortex body top bypass leakage way.

Fig. 5 is the utility model Stamping Steel Ribbon and the groove structure schematic representation laid thereof.

Fig. 6 is the step-down sulculus cell structure schematic representation in the utility model bypass leakage way.

Fig. 7 is the schematic representation of the another kind of structure of the utility model Stamping Steel Ribbon.

Embodiment

As Fig. 5-7, the utility model has flat groove 13 (or 23) (the vortex groove depth is generally about 1.5mm) in the position that the top end surface correspondence of moving scroll and fixed scroll vortex body 12 (or 22) just is pressed in the zone of high pressure, correspondingly in the groove 13 (or 23) of vortex body 12 (or 22) top end surface, be equipped with the vortex Stamping Steel Ribbon 3 (or 4) that matches, between them for being slidingly matched, and the bottom surface that is positioned at respective grooves 13 (or 23) of vortex Stamping Steel Ribbon 3 (or 4) has spaced and with the little groove 5 (as shown in Figure 6) of the perpendicular direction of vortex filament, perhaps, be interval with scrobicula cave 6 (as shown in Figure 7) in the bottom surface of vortex Stamping Steel Ribbon 3 (or 4).

In order to guarantee service behaviour of the present utility model, vortex Stamping Steel Ribbon 3 of the present utility model (or 4) should adopt the material of high abrasion, low coefficient of friction, low thermal coefficient of expansion, the Stamping Steel Ribbon that should adopt carbon fibre, glass and teflon blending material sintering to form.

The utility model mills out the flat groove 13 (or 23) that is parallel to vortex body involute wall respectively at two vortex body 12 (or 22) end faces, lays a novel relocatable Stamping Steel Ribbon 3 (or 4) in each groove 13 (or 23), as shown in Figure 5.The sealing mechanism of whole axle is with shown in Figure 3 identical, the utility model Stamping Steel Ribbon 3 (or 4) with the difference of conventional Stamping Steel Ribbon is, its bottom surface gathered the everywhere little groove 5 or the scrobicula cave 6 of gathering in the bottom surface, but adopt this novel floating seal bar, some sulculus chambers of playing the step-down effect can be formed, as Fig. 6 on the bypass passageways stroke of vortex body 12 (or 22) top.Tangentially the gas of Guo Louing is when bypass passageways shown in Figure 6, the step-down of just expanding to the sulculus chamber whenever, the gas stream that volume increases must increase through narrow gap velocity, requirement has bigger pressure reduction, cause the pressure drop of each sulculus chamber increasing like this, earial drainage gas can not unimpededly flow, and reaches sealing purpose.During the utility model work, the mixed gas of working medium in the scroll compressor system and oil is in the compression process of scroll compressor, pressure progressively increases, it is (promptly by the zone of high pressure to low pressure area) infiltration along the bottom of moving scroll and fixed scroll vortex body 12 (or 22) top end surface groove 13 (or 23) from inside to outside, because the bottom surface of the vortex Stamping Steel Ribbon 3 (or 4) of the utility model in their grooves 13 (or 23) has a plurality of spaced little grooves 5 (or spaced apart scrobicula cave 6), then the mixed gas of working medium and oil is moving, the buoyancy that the bottom of fixed scroll vortex body 12 (or 22) top end surface groove 13 (or 23) produces just can make vortex Stamping Steel Ribbon 3 (or 4) float fully reliably, and the upper surface of vortex Stamping Steel Ribbon 3 (or 4) is fitted tightly with the bottom surface of relative scroll all the time, reach the optimal seal effect.And this being sealed in the dynamic wear process of fitting tightly compensates all the time automatically, and remains the optimal seal effect, reduced the axial leakage of scroll compressor, improved the efficient and the working life of scroll compressor greatly.

Claims

1, a kind of axial seal mechanism of scroll compressor, it has flat groove in the position that the top end surface correspondence of moving scroll and fixed scroll vortex body just is pressed in the zone of high pressure, correspondingly in the groove of vortex body top end surface, be equipped with the vortex Stamping Steel Ribbon that matches, between them for being slidingly matched, the bottom surface that is positioned at respective grooves that it is characterized in that described vortex Stamping Steel Ribbon have spaced and with the little groove of the perpendicular direction of vortex filament, perhaps, be interval with the scrobicula cave in the bottom surface of vortex Stamping Steel Ribbon.

2, by the axial seal mechanism of the described scroll compressor of claim 1, it is characterized in that the vortex Stamping Steel Ribbon is formed by carbon fibre, glass and teflon blending material sintering.