CN102900479B - Variable nozzle turbocharger regulating mechanism integrated on turbine shell - Google Patents

Variable nozzle turbocharger regulating mechanism integrated on turbine shell Download PDF

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Publication number
CN102900479B
CN102900479B CN201210423087.4A CN201210423087A CN102900479B CN 102900479 B CN102900479 B CN 102900479B CN 201210423087 A CN201210423087 A CN 201210423087A CN 102900479 B CN102900479 B CN 102900479B
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CN
China
Prior art keywords
nozzle ring
nozzle
adjustable vane
mounting disc
integrated
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Expired - Fee Related
Application number
CN201210423087.4A
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Chinese (zh)
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CN102900479A (en
Inventor
马朝臣
施新
邢世凯
李聚霞
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Beijing Institute of Technology BIT
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Beijing Institute of Technology BIT
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Priority to CN201210423087.4A priority Critical patent/CN102900479B/en
Publication of CN102900479A publication Critical patent/CN102900479A/en
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Publication of CN102900479B publication Critical patent/CN102900479B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention relates to a variable nozzle turbocharger regulating mechanism integrated on a turbine shell, belonging to the technical field of variable nozzle turbochargers used for vehicles. The variable nozzle turbocharger regulating mechanism comprises nozzle ring fixed blades, nozzle ring adjustable blades, a mounting disc, driven gears, a driven gear ring, a driving gear, a double-rocker driving mechanism, a split-type turbine shell and a turbine shell cover board. The driven gears and the nozzle ring adjustable blades are respectively installed on the circumferences of the front and the back side faces of the mounting disc through mounting shafts of the driven gears and the nozzle ring adjustable blades. The driven gears are connected at the inner edge of the driven gear ring which is used for controlling the nozzle ring adjustable blades to revolve synchronously, and through the driven gear ring, the nozzle ring adjustable blades on the circumference can revolve synchronously. For the purpose of adapting to air motion law, the initial installation angles of the nozzle ring adjustable blades are arranged to be unequal along the circumferential direction. The width of the nozzle ring is controlled by the nozzle ring fixed blades, and the nozzle ring adjustable blades are driven by the double-rocker driving mechanism, so the accuracy and the uniformity of the adjustment of opening sizes of the nozzle ring adjustable blades are ensured.

Description

A kind of variable nozzle turbocharger controlling mechanism being integrated on turbine shroud
Technical field
Invention relates to automobile-used variable nozzle turbocharger technical field, is specifically related to a kind of variable nozzle turbocharger controlling mechanism being integrated on turbine shroud.
Background technique
Internal-combustion engine is from developing into more than 100 year later today, and correlation technique is constantly brought forth new ideas and moved to maturity.But internal-combustion engine still faces problems as automobile power: the thermal efficiency not high (particularly petrol engine); The petroleum resources that rely on reduce gradually; Pollution from exhaust emission atmosphere environment, and be difficult to concentrate improvement etc.Engine booster mainly improves density of the induced air by gas compressor, and this technology is used widely as the important measures that improve HP, hp/litre, improve Economy and emission performance.According to the difference that drives gas compressor mode, engine booster can be divided into engine driven supercharging, complex supercharge and three kinds of basic modes of exhaust gas turbocharge.
What motor was discharged in exhaust gas turbocharge has the waste gas introducing turbine of certain energy the acting of expanding, whole power of exhaust gas turbine, for driving and the gas compressor running wheel of turbo machine coaxial rotating, will be sent into cylinder in gas compressor again after compresses fresh air.Exhaust gas turbocharge, owing to having utilized exhaust energy, has improved the export ratio of useful horsepower, therefore motor Economy obviously improves, and can reduce significantly discharge and the noise level of harmful gas.
Vehicular engine is motive power machine device, exports high torque (HT) while requiring low speed.For exhaust gas turbocharge, because turbo machine is fluid machinery, its boosting capability depends on the rotating speed of pressurized machine.The raising of supercharger speed is that energy that the waste gas of discharging by motor has promotes vane rotary and obtains on turbo machine.When low engine speed, the little and energy shortage of extraction flow, the low pressurized effect of gas compressor that causes of secondary speed is not obvious, and engine torque increases few, conflicting with the engine torque characteristic that vehicle requires.Internal-combustion engine is the rapid response with rotating speed to load, and the Security to Vehicle Driving Cycle and Economy are very important.In the time that engine operating condition changes, the inertia of turbosupercharger self makes its transient response characteristic poor, need the regular hour from the foundation that changes to suction pressure of exhaust energy, not only affect the booster response characteristic of motor to mutational load, and because transient process is spun out and caused emission performance and economic performance variation while accelerating.
In order to ensure that motor has higher boost pressure and higher torque when the low speed, ensure that motor boost pressure in the time of high speed is unlikely too high again simultaneously, prevent the too high and turbosupercharger of engine heat load hypervelocity, should take corresponding technical measures to improve the torque characteristics of automobile-used turbosupercharged engine.
With the obvious advantage being widely applied that regulates the method for nozzle blade aperture to improve because of its engine performance.Adopt variable nozzle turbocharger compared with common pressurized machine, the low speed torque of motor, oil consumption, smoke intensity and transiting performance etc. have all obtained improvement to a certain degree.Variable nozzle turbocharger is in the time of low engine speed, nozzle ring adjustable vane aperture is reduced, thereby improve the gas pressure of turbine inlet, improved the acting ability of turbine inlet gas, increase turbine drives moment, so exhaust-gas turbocharger rotating speed is improved, boost pressure also improves; Otherwise in the time of high engine speeds, nozzle ring adjustable vane aperture increases, boost pressure reduces relatively, and while preventing high speed, boost pressure is too high.
The major defect that variable nozzle turbocharger exists is at present as follows:
1) traditional variable nozzle turbocharger nozzle ring adjustable vane drive unit is all installed on intermediate part, transform fixed nozzle turbosupercharger modification as variable nozzle turbocharger if want, need carry out structural change to intermediate and turbine part simultaneously, complex manufacturing, commutative rate and the versatility of part are low, improve cost of production, be difficult for realizing industrialization and produce.
2) in full accord when the aperture of the each nozzle ring adjustable vane of traditional variable nozzle turbocharger designs, be not inconsistent with the inlet air flow angle Changing Pattern of vehicular engine real work, increase energy loss.
3) in part variable nozzle turbocharger, although the aperture of nozzle ring adjustable vane can be made along with the change of engine speed corresponding adjustment, but in use its performance is extremely unstable, reliability is poor, in using process, may occur nozzle ring adjustable vane can not be completely by the situation of default regular movement, even stuck.Therefore, the application area of variable nozzle turbocharger is restricted, and is difficult to promote the use of on a large scale in vehicular engine.
Summary of the invention
In view of this, the invention provides a kind of variable nozzle turbocharger controlling mechanism being integrated on turbine shroud, wherein the variable nozzle ring adjustable vane of aperture and the immutable nozzle ring stator blade of aperture are circumferentially in the uniform nozzle ring that is arranged on variable nozzle turbocharger turbo machine, nozzle ring is the toroidal cavity forming between the internal face of the relatively split type turbine case in mounting disc surface, can improve the working efficiency of turbine in whole condition ranges.
A kind of variable nozzle turbocharger controlling mechanism being integrated on turbine shroud, mechanism comprises nozzle ring adjustable vane drive unit, three nozzle ring stator blades, three above nozzle ring adjustable vane, split type turbine case and turbine case cover plates, and peripheral unit is intermediate; Nozzle ring adjustable vane drive unit comprises mounting disc, driven gear, driving gear ring, driving gear, driving gear shaft and double rocking lever driving mechanism; Wherein, mounting disc is cirque structure;
In nozzle ring adjustable vane drive unit, three nozzle ring stator blades are fixed on by installation shaft on the same circumference of the same side of mounting disc, three nozzle ring stator blades are uniform on circumference, nozzle ring adjustable vane is movably arranged in mounting disc by installation shaft and is distributed between three nozzle ring stator blades, and nozzle ring stator blade and nozzle ring adjustable vane are by this circumference equal dividing;
Driven gear is positioned on the same circumference of mounting disc another side, driven gear is fixedly connected with the installation shaft of nozzle ring adjustable vane, on the residing circumference of driven gear, suit drives gear ring, each driven gear engages with the inner edge that drives gear ring, driving gear is connected on double rocking lever driving mechanism by driving gear shaft, and driving gear engages with the inner edge that drives gear ring simultaneously;
Its integrated connection closes: split type turbine case is fixedly connected with intermediate, nozzle ring adjustable vane drive unit is fixed on by nozzle ring stator blade on the inwall of split type turbine case vertical direction, and the cavity that the internal face of split type turbine case and mounting disc surface form is nozzle ring; Split type turbine case is fixedly connected with turbine case cover plate, in nozzle ring adjustable vane drive unit, the outer ring of the mounting disc inwall axial with split type turbine case contacts, the inner ring of mounting disc contacts with the axial inwall of turbine case cover plate, and double rocking lever driving mechanism is positioned at the chamber of split type turbine case and the formation of turbine case cover plate through turbine case cover plate;
The aperture of three nozzle ring stator blades is identical, and it is unequal mutually that the initial settling angle degree of each nozzle ring adjustable vane is along the circumferential direction designed to size, to meet the needs of turbo machine efficiency operation, more meets the actual conditions of vehicular engine.
Wherein, the width of nozzle ring stator blade is greater than the width of nozzle ring adjustable vane, nozzle ring stator blade Control Nozzle ring width, and nozzle ring stator blade adopts blunt nosed pneumatic blade profile;
It between nozzle ring adjustable vane installation shaft and mounting disc, is Spielpassung; It between nozzle ring stator blade installation shaft and mounting disc, is interference fit; The end of adjustable vane installation shaft is lower than driven gear end face;
Working principle: the import of split type turbine case is connected with waste pipe, engine exhaust enters nozzle ring region under the guiding of split type turbine case, by driving double rocking lever driving mechanism to make driving gear rotation, thereby driving gear drives and drives gear ring to rotate, the moving each driven gear being connected with adjustable vane of driving gear astragal is synchronizeed and is rotated, and then realizes the adjustment of nozzle ring adjustable vane aperture.In the time of motor starting or low-speed running, reduce the aperture of nozzle ring adjustable vane by double rocking lever driving mechanism, waste gas flow velocity is accelerated, exhaust-gas turbocharger rotating speed is higher, boost pressure improves relatively, has increased the driving moment of turbine, to improve the low speed torque output characteristics of motor; In the time of high engine speeds, increase the aperture of nozzle ring adjustable vane by double rocking lever driving mechanism, boost pressure reduces relatively, the too high and turbosupercharger hypervelocity of boost pressure while preventing high speed, engine heat load.
Beneficial effect:
1, in the present invention the initial settling angle degree of the each nozzle ring adjustable vane of variable nozzle turbocharger to be along the circumferential direction designed to size unequal mutually, to meet the needs of turbo machine efficiency operation, more meet the actual conditions of vehicular engine.The present invention utilizes three nozzle ring stator blade Control Nozzle ring widths, and nozzle ring stator blade adopts blunt nosed pneumatic blade profile, to reduce the receptance to carrying out flow path direction, and reduces aerodynamic loss.The width of nozzle ring stator blade is more bigger than the width of nozzle ring adjustable vane, and nozzle ring adjustable vane can freely be rotated in regulation process, has reduced resistance to motion, has ensured the stability of nozzle ring adjustable vane work.
2, in the present invention, between variable nozzle turbocharger nozzle ring adjustable vane installation shaft and mounting disc, be Spielpassung, reduced resistance to motion; Between variable nozzle turbocharger nozzle ring stator blade installation shaft and mounting disc, be interference fit, guarantee the stability of nozzle ring stator blade and mounting disc relative installation.Welding, lower than driven gear end face, is convenient in the end of adjustable vane installation shaft, can prevent that solder joint is outstanding, causes difficulty is installed.
3, nozzle ring adjustable vane drive unit provided by the invention is installed on the exhaust end of turbine shroud, by double rocking lever driving mechanism make nozzle ring adjustable vane within the specific limits (scope is adjustable) synchronously rotate, intermediate part does not need to do any structural change, component interchanging rate and versatility are improved, simplify production technology, reduce cost of production, be easy to realize industrialization and produce.
Brief description of the drawings
Fig. 1 is that the present invention is integrated in the variable nozzle turbocharger controlling mechanism drive end structural representation on turbine shroud;
Fig. 2 is that the present invention is integrated in the variable nozzle turbocharger controlling mechanism nozzle blade end structure schematic diagram on turbine shroud;
Fig. 3 is that the present invention is integrated in variable nozzle turbocharger controlling mechanism nozzle ring adjustable vane, mounting disc and the driven gear package assembly cut-away view on turbine shroud;
Fig. 4 is that the A of Fig. 3 is to view;
Fig. 5 is that the present invention is integrated in variable nozzle turbocharger controlling mechanism nozzle ring stator blade and the mounting disc package assembly cut-away view on turbine shroud;
Fig. 6 is that the A of Fig. 5 is to view;
Fig. 7 is that the present invention is integrated in the variable nozzle turbocharger controlling mechanism double rocking lever driving mechanism schematic diagram on turbine shroud
Fig. 8 is the plan view of Fig. 7;
The nozzle ring adjustable vane drive unit that Fig. 9 provides for the present invention is integrated in the variable nozzle turbocharger controlling mechanism on turbine shroud is arranged on the schematic diagram in turbosupercharger.
Wherein, 1 is nozzle ring stator blade; 2 is nozzle ring adjustable vane; 3 is mounting disc; 4 is driven gear; 5 for driving gear ring; 6 is driving gear; 7 is driving gear shaft; 8 is double rocking lever driving mechanism; 9 is split type turbine case; 10 is turbine case cover plate; 11 is turbine case cover plate mounting screw; 12 is nozzle ring adjustable vane drive unit construction bolt; 13 is split type turbine case mounting screw.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
The invention provides a kind of variable nozzle turbocharger controlling mechanism being integrated on turbine shroud, mechanism comprises nozzle ring adjustable vane drive unit, three nozzle ring stator blades 1, nine nozzle ring adjustable vanes 2, split type turbine case 9 and turbine case cover plates 10, and peripheral unit is intermediate; As shown in attached Fig. 1 and 2, nozzle ring adjustable vane drive unit comprises mounting disc 3, driven gear 4, drives gear ring 5, driving gear 6, driving gear shaft 7 and double rocking lever driving mechanism 8; Wherein, mounting disc 3 is cirque structure;
Three nozzle ring stator blades 1 are distributed in mounting disc with identical aperture α, and the width of nozzle ring stator blade 1 is used for Control Nozzle ring width; Nozzle ring stator blade adopts blunt nosed pneumatic blade profile, to reduce the receptance to carrying out flow path direction; It is unequal mutually that the initial settling angle degree of nine nozzle ring adjustable vanes 2 is along the circumferential direction designed to size, i.e. α 1≠ α n, ensureing that nozzle ring entrance has best suction pressure, the width b of nozzle ring stator blade 1 is greater than the width a of nozzle ring adjustable vane 2, and nozzle ring adjustable vane 2 can freely be rotated in regulation process;
As shown in Figures 3 and 4: wherein omitted driving gear ring 5, show driven gear 4, inner connecting structure between mounting disc 3 and nozzle ring adjustable vane 2, driven gear 4 has circular port with the installation shaft connecting end of nozzle ring adjustable vane, the shape of the installation shaft tail end section of nozzle ring adjustable vane 2 is identical with the circular port in the middle of driven gear, when connection, adjustable vane 2 installation shaft ends insert in circular port and form Spielpassung, and its end is lower than driven gear 4 ends, when assembling, adopt and be welded and fixed, ensure the reliability connecting between adjustable vane 2 and driven gear 4, and while installation, be not subject to the outstanding assembly problem causing of solder joint that the proper motion of adjustable vane 2 is interfered, it between this Placement driven gear 4 and the installation shaft of adjustable vane 2, is circular connection, both can simplify the manufacturing process of adjustable vane 2 installation shaft and driven gear 4, assemble easier, can prevent again adjustable vane 2 installation shaft and driven gear 4 Joint failure at high temperature, the gap in the middle of adjustable vane installation shaft and driven gear 4 between circular port is 0.03~0.08mm.
As illustrated in Figures 5 and 6: wherein omitted driving gear ring 5, shown the inner connecting structure between mounting disc 3 and nozzle ring stator blade 1; When connection, nozzle ring stator blade 1 installation shaft is inserted in mounting disc 3 and is formed interference fit, in nozzle ring stator blade 1 and installation shaft thereof, process axial hole, when installation, be connected on split type turbine case 9 by nozzle ring adjustable vane drive unit construction bolt 12, ensured the reliability connecting between nozzle ring stator blade 1 and mounting disc 3.
As shown in FIG. 7 and 8: variable nozzle turbocharger nozzle ring adjustable vane adopts double rocking lever driving mechanism 8, driving gear 6 is connected on double rocking lever driving mechanism 8 and (is considered the restriction of installing space by driving gear shaft 7, double rocking lever driving mechanism can adopt curvilinear rod to connect), rocking-turn handle can drive driving gear 6 to rotate by driving gear shaft 7 by double rocking lever driving mechanism 8, drives gear ring 5 to rotate thereby drive; Drive gear ring 5 to drive nine driven gears 4 that circumferentially arrange along described driving gear ring 5 inner rings to rotate, driven gear 4 is fixed with one by installation shaft and nozzle ring adjustable vane 2, therefore nozzle ring adjustable vane 2 with driven gear 4 synchronous rotaries, has been realized the adjustment of nozzle ring adjustable vane 2 apertures.
As shown in Figure 9, while being integrated in the variable nozzle turbocharger controlling mechanism assembling on turbine shroud, first assembling nozzle ring adjustable vane drive unit, nozzle ring adjustable vane 2 installation shaft ends are inserted in driven gear 4 circular ports and form Spielpassung (nozzle ring adjustable vane 2 installation shaft ends are lower than driven gear 4 ends), by driving gear ring 5 to be connected to the outer ring of several driven gears 4, then adopt the mode of welding that driven gear 4 and adjustable vane 2 installation shaft are connected again; Stator blade 1 adopts the mode of interference fit to be connected with mounting disc 3;
Then nozzle ring adjustable vane drive unit is positioned in split type turbine case 9, be fixed together through axial hole and split type turbine case 9 in nozzle ring stator blade 1 and installation shaft thereof by construction bolt 12, by turbine case mounting screw 13, split type turbine case 9 is linked together with intermediate, finally by cover plate mounting screw 11, turbine case cover plate 10 and split type turbine case 9 are connected, complete the installation of the variable nozzle turbocharger controlling mechanism being integrated on turbine shroud.
Wherein, drive the mode of double rocking lever driving mechanism 8 can adopt pneumatic control and two kinds of methods of electronic control.
Pneumatic control regulates the aperture of variable-nozzle adjustable vane with compressor delivery pressure or turbine inlet pressure, is a kind of continuous control system of feedback automatically, has simple in structurely, controls reliably, and the advantages such as low cost, are applicable to non-automatically controlled diesel engine.
Electronic control generally all adopts external impetus to drive variable nozzle ring adjustable vane, gather the working condition signal such as rotating speed, load, boost pressure, water temperature of motor, then utilize quick computing and the judgement of microcontroller to determine the best aperture of variable nozzle ring adjustable vane, finally rapidly variable nozzle ring adjustable vane is driven into target location by final controlling element.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (8)

1. the variable nozzle turbocharger controlling mechanism being integrated on turbine shroud, it is characterized in that described mechanism comprises nozzle ring adjustable vane, split type turbine case and the turbine case cover plate of the multiple that nozzle ring adjustable vane drive unit, three nozzle ring stator blades, numbers are three, peripheral unit is intermediate; Described nozzle ring adjustable vane drive unit comprises mounting disc, driven gear, driving gear ring, driving gear, driving gear shaft and double rocking lever driving mechanism; Wherein, mounting disc is cirque structure;
In described nozzle ring adjustable vane drive unit, three nozzle ring stator blades are fixed on by installation shaft on the same circumference of the same side of mounting disc, three nozzle ring stator blades are uniform on circumference, nozzle ring adjustable vane is movably arranged in mounting disc by installation shaft and is distributed between three nozzle ring stator blades, and nozzle ring stator blade and nozzle ring adjustable vane are by this circumference equal dividing;
Described driven gear is positioned on the same circumference of mounting disc another side, driven gear is fixedly connected with the installation shaft of nozzle ring adjustable vane, on the residing circumference of driven gear, suit drives gear ring, each driven gear engages with the inner edge that drives gear ring, driving gear is connected on double rocking lever driving mechanism by driving gear shaft, and driving gear engages with the inner edge that drives gear ring simultaneously;
Its integrated connection closes: split type turbine case is fixedly connected with intermediate, nozzle ring adjustable vane drive unit is fixed on by nozzle ring stator blade on the inwall of split type turbine case vertical direction, and the cavity that the internal face of split type turbine case and mounting disc surface form is nozzle ring; Split type turbine case is fixedly connected with turbine case cover plate, in nozzle ring adjustable vane drive unit, the outer ring of the mounting disc inwall axial with split type turbine case contacts, the inner ring of mounting disc contacts with the axial inwall of turbine case cover plate, and double rocking lever driving mechanism is positioned at the chamber of split type turbine case and the formation of turbine case cover plate through turbine case cover plate.
2. the variable nozzle turbocharger controlling mechanism being integrated on turbine shroud as claimed in claim 1, is characterized in that the aperture of described three nozzle ring stator blades is identical.
3. the variable nozzle turbocharger controlling mechanism being integrated on turbine shroud as claimed in claim 1, along the circumferential direction size is unequal mutually to it is characterized in that the initial settling angle degree of described each nozzle ring adjustable vane.
4. as described in claim 1,2 or 3, be integrated in the variable nozzle turbocharger controlling mechanism on turbine shroud, it is characterized in that the width of described nozzle ring stator blade is greater than the width of nozzle ring adjustable vane.
5. the variable nozzle turbocharger controlling mechanism being integrated on turbine shroud as claimed in claim 1 or 2, is characterized in that described nozzle ring stator blade adopts blunt nosed pneumatic blade profile.
6. the variable nozzle turbocharger controlling mechanism being integrated on turbine shroud as claimed in claim 5, is characterized in that between described nozzle ring stator blade installation shaft and mounting disc being interference fit.
7. as described in claim 1 or 3, be integrated in the variable nozzle turbocharger controlling mechanism on turbine shroud, it is characterized in that between described nozzle ring adjustable vane installation shaft and mounting disc being Spielpassung.
8. the variable nozzle turbocharger controlling mechanism being integrated on turbine shroud as claimed in claim 7, is characterized in that the end of described adjustable vane installation shaft is lower than driven gear end face.
CN201210423087.4A 2012-10-30 2012-10-30 Variable nozzle turbocharger regulating mechanism integrated on turbine shell Expired - Fee Related CN102900479B (en)

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CN108343639B (en) * 2018-03-26 2019-09-24 北京理工大学 Integral type end-clearance-free centrifugal compressor adjustable diffuser type blade assembly

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