CN104373377A - High-pressure-ratio gas compressor impeller of supercharger for internal combustion engine - Google Patents

Abstract

The invention discloses a high-pressure-ratio gas compressor impeller of a supercharger for an internal combustion engine. Transition fillets are designed at the connecting positions of each blade and a wheel disc. The radius of each transition fillet is gradually increased in the direction from an impeller passage inlet of a gas compressor to an impeller passage outlet of the gas compressor. The radius R of each transition fillet located on the impeller passage inlet of the gas compressor ranges from 3 mm to 6 mm. The radius R of each transition fillet located on the impeller passage outlet of the gas compressor ranges from 7 mm to 10 mm. Gas compressor impeller meridian passage data are designed cooperatively. Due to the structure of the transition fillets gradually changing, the impeller can well adapt to reasonable distribution of stress caused by increase of the pressure ratio, and the impeller reliability is improved; due to the passage meridian structure data of the novel gas compressor impeller, the stage efficiency of the gas compressor is improved, the range of the high stage efficiency area of the gas compressor of the supercharger is widened, and the work range of the high efficiency area of the supercharger is widened. The impeller is suitable for the supercharger for the internal combustion engine high in pressure ratio.

Description

Internal-combustion engine vehicle supercharger high pressure ratio compressor impeller

Technical field

The present invention relates to supercharger air compressor stuctures and properties technical field, particularly relate to a kind of new structure of internal combustion locomotive high pressure ratio pressure booster blower impeller.

Background technique

In internal-combustion engine vehicle supercharger, the effect of compressor impeller is absorbed by turbine, utilized the waste gas of discharging in cylinder of diesel engine to make mechanical work, to improve the air pressure of supercharger air compressor outlet.By the rotation of compressor impeller, by air intake to pressurized machine, and by air compressing, thus provide enough air to cylinder of diesel engine, make diesel oil Thorough combustion, reduce delivery temperature and heat load, reduce oil consumption, improve engine fuel economy.In existing technology, 1. gas compressor blade impeller blade and gas compressor blade wheel disc knuckle such as to adopt at the fillet design, and knuckle is R3mm ~ R10mm, and knuckle adopts the milling of cutter tough bulb single forming.Deng knuckle under the blade and wheel disc stress distribution complex situations of high pressure ratio impeller, as small round corner designs such as employings, blade root place stress value is large, can not meet design requirement, as the Rouno Cormer Pregrinding Wheel design such as adopted, vane inlet place runner narrow restriction fillet value, the Rouno Cormer Pregrinding Wheel such as can not to design, and design exists narrow limitation; 2., in application pressure ratio 3.0 ~ 4.5 scope, gas compressor high efficient area easily narrows and high efficiency declines, and Impeller Design exists certain difficulty.

Summary of the invention

Technical problem solved by the invention widens gas compressor blade impeller blade high efficient area scope in pressure ratio 3.0 ~ 4.5 scope, improves supercharger air compressor stage efficiency.

The technical solution used in the present invention is, internal-combustion engine vehicle supercharger high pressure ratio compressor impeller, comprise the blade on wheel disc and wheel disc, blade and the wheel disc position that is connected is designed with knuckle, the direction of radius along compressor impeller tunnel inlets towards compressor impeller runner exit of knuckle increases gradually, the radius at compressor impeller tunnel inlets place is R3mm ~ R6mm, and the radius at compressor impeller runner exit place is R7mm ~ R10mm;

Impeller outlet diameter 280mm ~ 300mm, import root footpath 50mm ~ 68mm, import top footpath 174mm ~ 183mm

Impeller outlet blade height 13.0mm ~ 16.5mm, interior meridional channel length 89mm ~ 103mm, short blade position is apart from runner exit 50mm ~ 58mm.

The radius at compressor impeller tunnel inlets place is R3mm ~ R6mm, and the radius at compressor impeller runner exit place is R7mm ~ R10mm.

The invention has the beneficial effects as follows, for supercharger compressor impeller of diesel locomotive provides a kind of novel change fillet structure design, better can adapt to because pressure ratio improves the stress reasonable layout brought, improve impeller reliability; A kind of Novel pressure mechanism of qi impeller channel meridian structured data is provided, improves compressor stage efficiency, and widen supercharger air compressor level high efficient area scope, increase pressurized machine high efficient area operating range.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Fig. 2 impeller sectional view.

Be labeled as in figure: 1-wheel disc, 2-blade, 3-knuckle.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

No matter be the split type impeller of gas compressor or integrated type impeller, adopt at the knuckle of blade and wheel disc and become fillet design, as shown in Figure 1, compressor impeller tunnel inlets source knuckle is R3mm ~ R6mm, knuckle is along the point of attachment of blade and wheel disc, that is to say the fitting line of blade and wheel disc, progressively increase towards Way out, the knuckle being transitioned into compressor impeller runner exit is gradually R7mm ~ R10mm.Knuckle adopts some milling to complete.

Compressor impeller meridional channel data, as shown in Figure 2:

(1) impeller outlet diameter 280mm ~ 300mm

(2) import root footpath 50mm ~ 68mm

(3) footpath, import top 174mm ~ 183mm

(4) impeller outlet blade height 13.0mm ~ 16.5mm

(5) interior meridional channel length 89mm ~ 103mm

(6) short blade position is apart from runner exit 50mm ~ 58mm.

Preferred forms is: compressor impeller tunnel inlets source knuckle is R5mm, and knuckle is along the fitting line of blade and wheel disc, and progressively increase towards Way out, the knuckle being transitioned into compressor impeller runner exit is gradually R9mm; Impeller outlet diameter 280mm; Import root footpath 51mm; Import top footpath 179mm; Impeller outlet blade height 15mm; Interior meridional channel length 92mm; Short blade position is apart from runner exit 55mm.

Internal-combustion engine vehicle supercharger high pressure ratio compressor impeller of the present invention, by the stuctures and properties analysis to the split type impeller of gas compressor and integrated type impeller, calculate, test, knuckle based on its blade and wheel disc adopts gradual change design, coordinate a kind of novel compressor impeller meridional channel data, than adopting single knuckle design, there is following advantages: the knuckle of gas compressor blade impeller blade and wheel disc adopts and becomes fillet design, fillet is by the R3mm ~ R6mm of compressor impeller tunnel inlets, be transitioned into the R7mm ~ R10mm of compressor impeller runner exit gradually, knuckle adopts some milling to complete.This structure can proof stress be in different leaves and the distribution taking turns panel well, and conservative control root stress Distribution Value, is conducive to solving because pressure ratio raising makes compressor blade Root Stress value exceed tolerance zone design problem, improves impeller reliability;

New blade profile meridional channel data can organize gas flow in impeller channel better, realize the distribution of high efficiency and high efficient area in pressure ratio 3.0 ~ 4.5 scope.Thus overcome because compressor impeller adopts inappropriate meridional channel data, reduce the working efficiency of compressor stage, gas compressor high efficient area is reduced.

Be conducive to the Impeller Design realizing the distribution of high efficiency and high efficient area in pressure ratio 3.0 ~ 4.5 scope.Analyze as calculated and test proof: internal-combustion engine vehicle supercharger novel high-pressure than under compressor impeller Structure adaptation high pressure ratio to the accurate control of centrifugal stress, in pressure ratio 3.0 ~ 4.5 scope, when surge margin >=15%, compressor efficiency >=80%.This architecture advances of novel impeller, has very wide application prospect and good economic benefit.

Claims (2)

1. internal-combustion engine vehicle supercharger high pressure ratio compressor impeller, comprise the blade on wheel disc and wheel disc, blade and the wheel disc position that is connected is designed with knuckle, it is characterized in that: the direction of radius along compressor impeller tunnel inlets towards compressor impeller runner exit of knuckle increases gradually, the radius at compressor impeller tunnel inlets place is R3mm ~ R6mm, and the radius at compressor impeller runner exit place is R7mm ~ R10mm;

Impeller outlet diameter 280mm ~ 300mm, import root footpath 50mm ~ 68mm, import top footpath 174mm ~ 183mm

Impeller outlet blade height 13.0mm ~ 16.5mm, interior meridional channel length 89mm ~ 103mm, short blade position is apart from runner exit 50mm ~ 58mm.

2. internal-combustion engine vehicle supercharger high pressure ratio compressor impeller as claimed in claim 1, it is characterized in that: the radius at compressor impeller tunnel inlets place is R3mm ~ R6mm, the radius at compressor impeller runner exit place is R7mm ~ R10mm.