CN105402348A - Hydraulic coupling for automobile turbine compound system - Google Patents

Abstract

The invention relates to a hydraulic coupling for an automobile turbine compound system, and the hydraulic coupling is used for transmitting high rotating speed and high power. According to the requirement of the turbine compound system, the effective circle diameter of the coupling is 140-160 mm; according to the effective circle diameter, the number of pump impeller blades and the number of turbine blades are 20-25; each blade is a non-uniform-thickness blade, and each blade is characterized in that the thickness of the root portion is 1.2-1.6 times of the blade point thickness, and the blade point thickness is 0.75-1.8 mm; full-three-dimension camber blades are adopted as the pump impeller blades and the turbine blades, the angles of the blades at an outlet of a pump impeller range from 65 degrees to 75 degrees, and the angles of the blades at an inlet of the pump impeller range from 90 degrees to 95 degrees; the angles of the blades at an inlet of a turbine range from 63 degrees to 68 degrees, and the angles of the blades at an outlet of the turbine range from 70 degrees to 75 degrees. Compared with a conventional straight-blade hydraulic coupling, torque and power transmission of the hydraulic coupling can be obviously improved, and the hydraulic coupling can be applied to the automobile turbine compound system to transmit high speed and high power; the highest rotating speed of the system can reach 12000 r/min, transmitted power is 150 Kw, the effective circle diameter is reduced, and the requirement of an engine mounted on a vehicle which is limited in space and compact in structure is met.

Description

A kind of vehicle turbine combined system fluid coupling

Technical field

The present invention relates to a kind of fluid coupling, particularly a kind of being applicable to transmits high rotating speed, high-power fluid coupling in vehicle turbine combined system, belongs to hydraudynamic drive technical field.

Background technique

Fluid coupling is a kind of efficient, energy-conservation drive technology, the feature of its Flexible Transmission makes it can coordinate many power engines synchronously to drive, alleviate and isolate the impulsive load caused due to working conditions change, being therefore widely used in the transmission system of various engineering machinery and vehicle.In the turbo-compound system of automobile, fluid coupling plays the key effect of taking over from the past and setting a new course for the future, and this is inseparable with its work characteristics: compared to traditional mode such as rigid gear transmission, electromagnetic driven, hydraudynamic drive effectively can reduce impulsive load; Actual road conditions are full of uncertainty, cause engine output to change at any time, and due to the existence of rotating ratio, and the operating conditions of fluid coupling can regulate according to the change of load automatically; The most important thing is, in turbo-compound system, what input engine crankshaft is internal-combustion engine active force and power turbine auxiliary power, it is harmonious that these two kinds of power input needs simultaneously, otherwise mutually can interfere, reduce and always input, and " flexibility " of hydraudynamic drive can be coordinated many power well and input simultaneously.When turbo-compound system is mainly used in the diesel engine that power demand is large, air displacement is large, power turbine output speed is higher, transmitted power is larger, and due on vehicle motor lay limited space, therefore require turbo-compound system compact overall structure, cause the active chamber effective diameter of coupler less.

In hydraudynamic drive field, at present and this patent correlative study situation as follows: CN101473125A document discloses a kind of Turbocompound engine drive, document is referred to fluid coupling, but this fluid coupling is only one of its parts, the detailed inner feature of this coupler unexposed and roadability.The documents such as CN101614269A, CN101709771A, CN103807403A, CN1199810A disclose the multi-form fluid torque converter with three dimendional blade.Distinguish to this patent and be: although fluid torque converter is similar to hydraulic coupler rotor principle, the variety classes that all belongs to hydraulic transmission component, but both are because of application direction difference, its bending blade form, three-dimensional blade profile are also completely different, and wherein fluid coupling adopts prismatic blade form usually.This seminar is according to lot of experiments and numerical simulation, devise a kind of there is full three dimendional blade form be applicable to small size, high-power fluid coupling, the blade angle distortion scope of this blade and the rotating speed interval of running, above-mentioned document all there is no relevant discussion.

The researcher of this seminar, according to the research research work of different direction that needed carry out the same period, have employed the research of two dimension, accurate three-dimensional, full three-dimensional bending blade, wherein accurate two blades adopt uniform thickness to arrange, bend to Way out from vane inlet, traffic coverage is 3000r/min-7500r/min.This design has certain lifting to fluid coupling performance, but have ignored the high rotating speed of transmission, high power to stability during fluid coupling and reliability.This patent considers to transmit high rotating speed, high power needs the design of fluid coupling stability, adopt full three-dimensional bending blade shape, and according to lot of experiments and numerical simulation, determine the blade angle distortion scope being applied to more than 10000r/min, at present can safe operation to 12000r/min.

BROAD SUMMARY

The object of this invention is to provide one to have and meet high rotating speed, small size, powerful requirement, there is the fluid coupling of three-dimensional bending blade structure.

Technological scheme of the present invention is:

(1) according to turbo-compound system requirement, the effective circular diameter of fluid coupling is 140mm-160mm.

(2) according to the effective circular diameter of active chamber that (1) is chosen, coupling pump impeller, turbine blade quantity are 20-25 sheet;

(3) blade adopts not straightedge vane, and it is characterized by root thickness and be greater than blade tip thickness 1.2-1.6 doubly, blade tip thickness is 0.75mm-1.8mm;

(4) coupling pump impeller and turbine blade all adopt full three-dimensional bending blade, wherein: pump impeller exit vane angle 65-75 °, and pump impeller inlet vane angle 90-95 °, turbine inlet blade angle 63-68 °, turbine outlet blade angle 70-75 °.

The present invention relatively has following characteristics with existing prismatic blade formula coupler: high rotating speed, small size, high-power.The fluid coupling of the effective circular diameter 150mm wherein designed, runs maximum speed 7500r/min by tradition and is lifted beyond 10000r/min, Part load can safe operation to 12000r/min.To under specific speed 7500r/min operating mode, relatively traditional prismatic blade coupler, can transmit the moment of torsion of 54.2Nm at declared working condition point i=0.96 place, and transmit the power of 42kW, the moment of torsion under identical operating point and power increase 2.62 times.When rotating speed is higher, prismatic blade coupler fluid coupling internal flow loss sharply increases, and causes that transmission efficiency reduces, transmitted power sharply declines; This patent is by adopting the full three-dimensional bending design of blade, and the pressure reduction of runner bucket pressure side and suction surface is obviously increased, and capacity for work increases; The flow angle in turbine inlet, pump impeller outlet port is almost nil, and vortex structure reduces, and flow losses are less; Axial whirlpool in two-wheeled blade passage reduces greatly, thus improves fluid coupling interior three-dimensional flow field, improves the stability characteristic (quality) under high speed conditions.

Accompanying drawing explanation

Accompanying drawing 1 fluid coupling three-dimensional hydraulic illustraton of model

Embodiment

Embodiment:

Major parameter is as shown in table 1, and blade adopts three-dimensional curved forms, and wherein characteristic parameter is: pump impeller exit vane angle 74.2 °, pump impeller inlet vane angle 94.3 °, turbine inlet blade angle 64.5 °, turbine outlet blade angle 73.1 °.Test result is in table 2, table 3.

Table 1 embodiment model main geometric parameters

Table 2 embodiment operating mode 1:n _b=12000r/min test result (liquid filled ratio: 80%)

Table 3 embodiment operating mode 2:n _b=7500r/min test result (liquid filled ratio: 80%)

Comparative example 1:

Contrast the Master's thesis write by this seminar member Luo Yi: " high-speed small-size fluid coupling Inner Flow Simulation and performance prediction ", the blade form of laying is that radial direction lays uniform thickness prismatic blade.Main geometric parameters is as shown in table 4, and test result is in table 5.

Table 4 straight radial blade model parameter

Table 5 comparative example n _b=7500r/min test result (liquid filled ratio: 80%)

Known according to table 2, embodiment may operate at 12000r/min, and the given maximum speed of comparative example is 7500r/min.According to table 3 and table 5, under rotating speed 7500r/min operating mode, relatively and comparative example, can transmit the moment of torsion of 54.2Nm at declared working condition point i=0.96 place, transmit the power of 42kW, the moment of torsion under identical operating point and power increase 2.62 times to embodiment.Therefore, fluid coupling of the present invention relatively conventional prismatic blade fluid coupling transmitting torque and power obviously promote, be applicable at a high speed, transmit high-power, at rotating speed 12000r/min, can safety and stability transmitted power 150 kilowatts, and effectively circular diameter is only 150mm, the demand of motor on the satisfied vehicle being placed in limited space, compact structure.

Claims (1)

1. be applicable in vehicle turbine combined system, transmit high rotating speed, a high-power fluid coupling, it is characterized in that:

(1) according to turbo-compound system requirement, the effective circular diameter of fluid coupling is 140mm-160mm;

(2) according to the effective circular diameter of active chamber that (1) is chosen, coupling pump impeller, turbine blade quantity are 20-25 sheet;

(3) blade adopts not straightedge vane, and it is characterized by root thickness and be greater than blade tip thickness 1.2-1.6 doubly, blade tip thickness is 0.75mm-1.8mm;

(4) coupling pump impeller and turbine blade all adopt full three-dimensional bending blade, wherein: pump impeller exit vane angle 65-75 °, and pump impeller inlet vane angle 90-95 °, turbine inlet blade angle 63-68 °, turbine outlet blade angle 70-75 °.