CN204371768U - A kind of turbo-charger blower impeller of anti-low cycle fatigue - Google Patents
A kind of turbo-charger blower impeller of anti-low cycle fatigue Download PDFInfo
- Publication number
- CN204371768U CN204371768U CN201420787319.9U CN201420787319U CN204371768U CN 204371768 U CN204371768 U CN 204371768U CN 201420787319 U CN201420787319 U CN 201420787319U CN 204371768 U CN204371768 U CN 204371768U
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- China
- Prior art keywords
- cycle fatigue
- pinch roller
- turbo
- low cycle
- blower impeller
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Abstract
The utility model belongs to field of turbochargers, the turbo-charger blower impeller of specifically a kind of anti-low cycle fatigue.It comprises wheel pressing shaft, pinch roller, and pinch roller top is provided with seal boss, and described pinch roller blade back is provided with noncontact seal device.The utility model has the advantages that the labyrinth-type excluder of noncontact seal device causes the unexpected change of passage section, make gas flow through change place suddenly of each cross section and throttling action occurs, produce the pressure loss, stream pressure is declined.
Description
Technical field
The utility model belongs to field of turbochargers, the turbo-charger blower impeller of specifically a kind of anti-low cycle fatigue.
Background technique
Come out in more than 100 year at internal-combustion engine, on the equipment such as boats and ships, lorry, engineering machinery, military vehicle, small hydropower station, diesel engine is used widely.Even if in car, also some selects diesel engine as power.But; along with the minimizing day by day of petroleum resources; the research of the aspects such as the efficiency of raising diesel engine and UTILIZATION OF VESIDUAL HEAT IN is the important topic of diesel engines at present enterprise and each scientific research institution; many problems that will solve are also had in addition in all many-sides such as noise, vibration, discharges; so just require that diesel engine is towards the developing direction of high-performance, long-life, high efficiency, low oil consumption, low noise, low vibration, low emission, could petroleum resources shortage and protection of the environment huge challenge in occupy advantage.The people that develop into of diesel engine supercharging technology obtain high-quality diesel machine and provide good solution route.The appearance of turbosupercharger, greatly facilitates the development of internal-combustion engine, is described as second milestone in internal combustion engine development history.
Turbosupercharger is the blade mechanism of High Rotation Speed, and vehicle turbocharger working speed is generally about 100000r/min, and maximum speed reaches 260000r/min.Supercharger rotor blade in use bears cyclic loading (low week) and the oscillating load (high week) of centrifugal force and gas force, and they are the principal elements affecting leaf longevity.The operating conditions of compressor impeller is relatively more severe, stressed also very complicated, but due to speed very high, topmost stressed be centrifugal force.Under the working state of some frequent start-stops, the large stomidium mouth of the compressor impeller of usual structure can checking, and then causes and break, and cause pressurized machine to work, its main cause is low-cycle fatigue failure.Low cycle fatigue, also known as conditional fatigue limit, or " low cycle fatigue ".In addition, conventional compressor impeller adopts cast aluminium alloy material, its internal body often have be mingled with, shrinkage hole, these defects are also the destruction sources causing low cycle fatigue.
The compressor impeller of usual structure is under cyclic loading, and the large stomidium mouth of connection turbine shaft can checking, and then causes and break, and causes pressurized machine to work.Its main cause is low-cycle fatigue failure.Low cycle fatigue also known as conditional fatigue limit, or " low cycle fatigue ", is the main failure mode of compressor impeller.As shown in Figure 1, the compressor impeller of usual structure descends stress maximum value to appear in the bottom corner in impeller central hole in working order, its reason is that the centrifugal force produced due to High Rotation Speed forms tensile stress at impeller internal, and as can be seen from the external form of impeller, the base material of impeller is many, barycenter is near vane edge side, inertia ratio is comparatively large, therefore, forms outside centrifugal force also larger, affect and inner form the region of high stress, thus cause fracture failure at most weakness.Top is just in time contrary, and quality focuses mostly near axis, and outside is impeller blade, and inertial force is less, and stress is little.In radially direct, impeller is comparatively large near axis portion stress, and outside is impeller blade, and inertial force is less, and stress is little, outwards in reduction trend.Minimum stress appears at the tip of big leaf's slice, the reason of this distribution is, material near axis is larger by the traction of outside centrifugal force, using investigated particle as boundary line, the material being radiated the interval at the edge of impeller beyond axis is more, barycenter is the closer to wheel rim, and the stress suffered by this barycenter is larger.
Summary of the invention
The utility model is the turbo-charger blower impeller of a kind of anti-low cycle fatigue proposed for the above problem of compressor impeller.
Provide following technological scheme:
A turbo-charger blower impeller for anti-low cycle fatigue, it comprises wheel pressing shaft, pinch roller, and pinch roller top is provided with seal boss, and described pinch roller blade back is provided with noncontact seal device.
Described noncontact seal device is labyrinth sealing ridge.
Three sections of screw threads be connected with turbine shaft are provided with in described wheel pressing shaft.
The utility model has the advantages that the labyrinth-type excluder of noncontact seal device cause passage section unexpected change, make gas flow through change place suddenly of each cross section and throttling action occur, produce the pressure loss, stream pressure is declined.
Accompanying drawing explanation
Fig. 1 is the structural representation of turbo-charger blower impeller of the prior art.
Fig. 2 is structural representation of the present utility model;
Fig. 3 is the utility model and turbine shaft connection diagram;
Fig. 4 is the utility model and turbine connection diagram;
Fig. 5 is the enlarged diagram at N place in Fig. 4;
Fig. 6 is the structural representation of noncontact seal device.
Embodiment
As a kind of in Fig. 2 turbo-charger blower impeller of anti-low cycle fatigue, it comprises wheel pressing shaft 1, pinch roller 2, pinch roller top is provided with seal boss 3, the wheel pressing shaft 1 that described pinch roller blade back 5 is provided with noncontact seal device 5a compressor impeller connection turbine shaft is set to the cylindrical seal boss 3 of reduced, the diameter of this boss by 1.8 times of connection turbine shaft diameter, compare this position diameter of traditional compressor impeller and reduce about 25%.The diameter of boss is little, and quality focuses mostly near axis, and the tensile stress produced during rotation reduces greatly, improves the fatigue resistance of the aperture place region of high stress.
Noncontact seal device as described in Fig. 4, Fig. 5 is labyrinth sealing ridge 5a, and in machine operation, labyrinth sealing does not have mechanical wear, reliable operation.The principle of this seal arrangement utilizes throttling action and reaches sealing effect.Labyrinth-type excluder cause passage section unexpected change, make gas flow through change place suddenly of each cross section and throttling action occur, produce the pressure loss, stream pressure is declined.
As shown in Figure 3, the hole connect with turbine shaft is set to blind hole, and pinch roller right-hand member is solid structure, and often porose, otch, step etc. in mechanical parts, the discontinuous place of this class formation will cause stress to concentrate, and become " formation of crack " of low-cycle fatigue failure.The hole of conventional compressor impeller connection is through-hole structure, and large stomidium mouth place is the main portions that low-cycle fatigue failure occurs.The hole that compressor impeller of the present invention and turbine shaft connect, be set to tapped hole and two place's positioning holes, and eliminate nut, three sections of screw threads be connected with turbine shaft are provided with in wheel pressing shaft 1, outside thread 4a, 4b, 4c on turbine shaft 4 are connected with internal thread 1a, 1b, 1c in wheel pressing shaft respectively, wherein screw thread 4b coordinates with screw thread 1b and reaches fixation, and screw thread 4a, 4c and screw thread 1a, 1c reach certralizing ability.The hole of compressor impeller connection turbine shaft of the present invention is set to blind hole structure, right-hand member is solid, center of mass is near wheel disc, the maximum tension stress district rotating generation in work process is solid position, there is no structural sudden change, there is not area of stress concentration, compare the compressor impeller of perforate, its fatigue resistance is improved significantly.
As shown in Figure 6, M is airflow direction, when pressurized machine works, due to the effect of pressure difference, pressurized gas is known from experience along the gap between pinch roller blade back and gland to intermediate internal leakage, when gas flow is through labyrinth sealing ridge 5a place, due to the unexpected change of flow area, make gas produce the pressure loss, thus produce the effect of sealing.
Claims (3)
1. a turbo-charger blower impeller for anti-low cycle fatigue, it comprises wheel pressing shaft, pinch roller, it is characterized in that: pinch roller top is provided with seal boss, and described pinch roller blade back is provided with noncontact seal device.
2. the turbo-charger blower impeller of a kind of anti-low cycle fatigue according to claim 1, is characterized in that: described noncontact seal device is labyrinth sealing ridge.
3. the turbo-charger blower impeller of a kind of anti-low cycle fatigue according to claim 1, is characterized in that: be provided with three sections of screw threads be connected with turbine shaft in described wheel pressing shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420787319.9U CN204371768U (en) | 2014-12-12 | 2014-12-12 | A kind of turbo-charger blower impeller of anti-low cycle fatigue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420787319.9U CN204371768U (en) | 2014-12-12 | 2014-12-12 | A kind of turbo-charger blower impeller of anti-low cycle fatigue |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204371768U true CN204371768U (en) | 2015-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420787319.9U Expired - Fee Related CN204371768U (en) | 2014-12-12 | 2014-12-12 | A kind of turbo-charger blower impeller of anti-low cycle fatigue |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204371768U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500440A (en) * | 2014-12-12 | 2015-04-08 | 常州环能涡轮动力股份有限公司 | Low-cycle-fatigue-resistant turbocharger air compressor impeller |
| CN114033717A (en) * | 2021-11-02 | 2022-02-11 | 潍坊科技学院 | Compact turbine rotor device of turbo charger high strength end face location |
-
2014
- 2014-12-12 CN CN201420787319.9U patent/CN204371768U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500440A (en) * | 2014-12-12 | 2015-04-08 | 常州环能涡轮动力股份有限公司 | Low-cycle-fatigue-resistant turbocharger air compressor impeller |
| CN114033717A (en) * | 2021-11-02 | 2022-02-11 | 潍坊科技学院 | Compact turbine rotor device of turbo charger high strength end face location |
| CN114033717B (en) * | 2021-11-02 | 2023-07-04 | 潍坊科技学院 | High-strength end face positioning compact turbine rotor device of turbocharger |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20181212 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |