CN1087160A

CN1087160A - Short-vane type diffuser

Info

Publication number: CN1087160A
Application number: CN 92113029
Authority: CN
Inventors: 姜鹏明; 耿晓音
Original assignee: 姜鹏明
Current assignee: Benjing Luchuang Environment Protection Equipment Co., Ltd.
Priority date: 1992-11-18
Filing date: 1992-11-18
Publication date: 1994-05-25
Anticipated expiration: 2007-11-18
Also published as: CN1056673C

Abstract

Short-vane type diffuser is used for centrifugal compressor, in particular for the variable geometry compressor Diffuser.The present invention places the outlet section or the inducer of Diffuser with the stator of vaned diffuser, has concentrated the advantage of vaned diffuser and vaneless diffuser, the working zone with same broadness, and efficient has improved 8.6%, and pressure ratio is almost identical with vaned diffuser; Use this Diffuser the biserial leaf grating can be done coaxial rotation, thereby realize the variation of how much through-flow runners.The control mechanism of this variable-geometry is very simple.Manufacturing of the present invention is simple, help lend some impetus to the extensive use of turbosupercharger, especially the application on vehicle motor improves the adaptive capacity of turbosupercharger for vehicle motor variable working condition characteristic, thereby improves power character, Economy and the reduction toxic emission of motor significantly.

Description

Short-vane type diffuser

Short-vane type diffuser is used for centrifugal compressor, in particular for variable-geometry whirlpool compressor (being called for short VGC) Diffuser.

In recent years, development at full speed is paid much attention to and obtained to variable geometry turbine technology (being called for short VGT) why, one of its major reason, this exactly technology can be improved the adaptive capacity of turbosupercharger for vehicle motor variable working condition characteristic, thereby improves power character, Economy and the reduction toxic emission of motor significantly.VGT up to now studies, and mainly concentrates on impeller and the entry guide vane and the vaneless diffuser aspect of turbo machine, compressor.Though and vaned diffuser can improve peak efficiencies and pressure ratio, yet seem owing to its working zone is too narrow and to lose more than gain, thereby seldom in VGT, use.Britain HOLSET company has taken the lead in producing the VGT model machine, use also be vaneless diffuser, this has just limited efficient and the pressure ratio that reaches higher greatly, and also more complicated of control mechanism, has increased manufacturing expense, has reduced the reliability of using.

The purpose of this invention is to provide a kind of vaned diffuser that can be used in variable geometry turbocharger.

The front face (1) of the straight wall type Diffuser of centrifugal compressor and rear surface (2) are actually to be made up of two concentric circles.The present invention with Diffuser by its radially effective length be divided into two zones, and be defined as inducer (3) and outlet section (4) as shown in Figure 1 by air-flow trend.

The present invention will hang down the inducer that grid silk fabric degree short blade (5) places the Diffuser antetheca, as shown in Figure 2, or place the outlet section of rear wall, as shown in Figure 3, and import and export all vaneless antetheca of section and can form two kinds of novel vaned diffusers of A, B.

High grid denseness blade has definite throat, and its working field is narrow, introduces the stator occasion in the time of can only being used for small flow as the variable-geometry device, or when big flow by coaxial Unscrew throat.

With Fig. 2 and Diffuser combination shown in Figure 3, be called A group biserial leaf grating Diffuser.Diffuser ring shown in Figure 3 is fixed, and another does coaxial rotation in the arc length of a runner.When the short leaf of outlet is positioned at the runner center elongation line of the short leaf of inlet, just formed the biserial leaf grating that blade interlaces and arranges, as shown in Figure 4.Coaxial rotation is done in the variation of operating mode during according to use, just can realize the variation of how much through-flow runners.When the position that reaches capacity, just become the common Diffuser that comes into leaves, as shown in Figure 5 with linear leaf (6).Like this, when small flow, can use state shown in Figure 5, obtain satisfied performance characteristic, can be widened at the working field of pumping point.And in during big flow, then can use state shown in Figure 4, so that obtain broader working field.The control mechanism of this Diffuser also can be very simple.

With Fig. 3 and no blade to enlarge pressure ring combination, be called the low grid silk fabric degree outlet section short-vane type diffuser of B group.

The low grid silk fabric degree outlet section short-vane type diffuser of B group has surprising broad working field owing to having expanded choked flow working field (is the boundary with 60% efficient point), compares with vaneless diffuser, has all improved the performance of Diffuser on most working fields.The air-flow that leaves impeller has well-mixed chance, and has possessed the flow condition that enters blade relatively uniformly before entering blade, on the other hand, at the blade of outlet section air-flow is imported dirty volute, has improved the coupling of Diffuser and volute thus.This Diffuser has been concentrated the advantage that leaf and vaneless diffuser are arranged, and compares with vaneless diffuser, has the working zone of same broadness, and efficient has improved 8.6%, and pressure ratio is almost identical with vaned diffuser, and structure is very simple.

The present invention helps lend some impetus to the extensive use of turbosupercharger, the especially application on vehicle motor, thus reach the purpose that when improving engine performance, reduces discharging.

Description of drawings:

Fig. 1: common centrifugal compressor vaneless diffuser.Wherein: 1-front face, 2-rear surface, 3-inducer, 4-outlet section.

Fig. 2: low grid silk fabric degree inducer short-vane type Diffuser ring.Wherein: the 5-short blade;

Fig. 3: low grid silk fabric degree outlet section short-vane type Diffuser ring;

Fig. 4: biserial leaf grating Diffuser;

Fig. 5: the low grid silk fabric degree Diffuser that comes into leaves.Wherein: the 6-linear leaf;

Fig. 6: A group biserial leaf grating diffuser performance curve;

The low grid silk fabric degree outlet section short-vane type diffuser performance curve of Fig. 7: B group;

Embodiment 1:

A group biserial leaf grating Diffuser, Diffuser ring external diameter ∮ 139MM, internal diameter ∮ 87.6MM, the high 7MM of leaf.61.8 ° of blade outlet angles, the performance curve of A group biserial leaf grating Diffuser is seen Fig. 5, and T11 represents the situation of biserial leaf grating among the figure, and its working field is very wide.T9 represents the limit position of its rotation, the Diffuser that promptly comes into leaves, and its efficient when intermediate flow is higher.

Embodiment 2:

B group biserial leaf grating Diffuser, Diffuser ring external diameter ∮ 139MM, internal diameter ∮ 87.6MM, the high 7MM of leaf.61.8 ° of blade outlet angles, the performance curve of B group biserial leaf grating Diffuser is seen Fig. 6, the situation of the short blade to enlarge pressure device of the low grid silk fabric degree outlet of T7 representative among the figure, dotted line is represented vaneless diffuser.As seen, its working field is almost the same with vaneless diffuser wide, and its pressure ratio is then almost identical with the Diffuser that comes into leaves with efficient.T3 represents the situation of the short blade to enlarge pressure device of high grid silk fabric degree outlet among the figure, and as seen its pressure ratio and efficient are all not as the short blade to enlarge pressure device of low grid silk fabric degree outlet.

Claims

1, a kind of short-vane type diffuser is made up of antetheca, rear wall, the short blade that is installed on antetheca or the rear wall.It is characterized in that Diffuser radially is divided into import and two zones of outlet, the radial length of short blade is less than this zone.Blade grid denseness is low grid denseness.

2, want 1 described short-vane type diffuser as right, it is characterized in that short blade can be installed in the outlet section on antetheca or the rear wall, and can use separately.

3, want 1 described short-vane type diffuser as right, it is characterized in that short blade can be installed in inducer and outlet section simultaneously, realize the variation of how much passage sections by coaxial rotation.