CN101413433B

CN101413433B - Guide blade type module type pulse conversion turbocharging system

Info

Publication number: CN101413433B
Application number: CN2008102030275A
Authority: CN
Inventors: 邓康耀; 王绍明; 崔毅; 田中旭; 石磊
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2008-11-20
Filing date: 2008-11-20
Publication date: 2010-06-23
Anticipated expiration: 2028-11-20
Also published as: CN101413433A

Abstract

The invention relates to a guide vane type module-mode pulse conversion turbocharging system and belongs to the technical field of internal combustion engine. The guide vane type module-mode pulse conversion turbocharging system comprises a cylinder, an exhaust branch pipe, an exhaust pipe, a turbine and a guide vane; the guide vane is arranged inside the exhaust branch pipe; and the exhaust branch pipe is divided into a gradually reducing pipe and a gradually increasing pipe. When an engine operates in low load, in the initial stage of exhaust, the restriction loss of an exhaust valve is reduced as a result of the existence of the guide vane; when a piston drives the exhaust air to flow out, as the increasing pipe has the function of pressure diffusion, the negative pressure of the exhaust air is reduced; and jet current is formed in an outlet of the reducing pipe so as to achieve the draining function on the exhaust air of the increasing pipe, thereby reducing the loss of pumped air and improving the low-load performance of the engine. When the engine runs in high load, the supercharging system can be wholly regarded as the module-mode pulse conversion turbocharging system and is favorable for high-load operation. The guide vane type module-mode pulse conversion turbocharging system has the advantages that the guide vane type module-mode pulse conversion turbocharging system has reasonable design and a simple structure, can improve the low-load performance of the engine and is suitable for the turbocharging system the turbine of which is provided with a single inlet and laterally arranged.

Description

Guide blade type module type pulse conversion turbocharging system

Technical field

The present invention relates to a kind of internal combustion engine turbocharging system, particularly a kind of turbine is the guide blade type module type pulse conversion turbocharging system of single import and turbine side, belongs to technical field of internal combustion engines.

Background technique

Along with the development of society and the raising of environmental requirement, now the engine booster technology is used more and more widely, in powerful motor mostly adopt turbocharging technology, to improve power and to reduce fuel consumption rate.Two kinds of basic pressurization systems of turbosupercharged engine are constant pressure charging system and impulse pressure charging system.The structural feature of constant pressure charging system is exactly that exhaust pipe volume is bigger, and outlet pipe plays pressure stabilization function, and the exhaust pressure fluctuation is little, and by the stability of flow of turbine, turbine has higher efficient; But bigger in the restriction loss of drain tap place, exhaust increases bigger from drain tap to the entropy the turbine inlet place, and the exhaust pulses energy almost completely loses; It is high more to load, and shared ratio will be few more in all exhaust energies for pulse energy, and stable operation is favourable so the level pressure system is for high load.The exhaust pipe volume of impulse pressure charging system is less, and exhaust increases less from drain tap to the entropy the turbine inlet place, exhaust energy utilization ratio height, and can in time reflect the variation of load, speed of response is fast; But, cause turbine efficiency low, so impulse pressure charging system is favourable for low-load and instantaneous conditions because turbine is the pulsation air inlet.The modular pulse converter supercharging system is the MPC system, combines the advantage of impulse pressure charging system and constant pressure charging system, but the low-load performance of this pressurization system is very poor, and can make the temperature of partial cylinders head too high when being applied on some motor.In prior art, the patent No. is 97242566.7, and name is called the utility model patent of mixed pulse converter vent systems, solved the too high problem of temperature of partial cylinders head when motor adopts the MPC pressurization system, but low-load performance is still not fine.

Summary of the invention

In order to overcome the deficiency of prior art, the invention provides a kind of guide blade type module type pulse conversion turbocharging system.When engine low load moved, the stator in the exhaust branch pipe can make the engine low load performance improve; When high engine load was moved, this moment, air outlet duct system integral body was the modular pulse converter supercharging system, and the high load of motor is functional.The present invention can make motor can both obtain more excellent performance under each operating conditions, and satisfies the requirement of Economy and power character aspect simultaneously.

The technological scheme taked of the present invention is for achieving the above object: this system comprises cylinder, exhaust branch pipe, outlet pipe, turbine and circular arc stator, cylinder is connected with outlet pipe by exhaust branch pipe, turbine is single import, the outlet of outlet pipe is connected with the import of turbine, exhaust branch pipe is a reducing pipe that sectional area reduces gradually, the long-pending ratio range of the discharge area of exhaust branch pipe and entrance section is 0.6 to 0.9, the circular arc stator is installed in the inside of exhaust branch pipe, its the top is d with the perpendicular distance of exhaust branch pipe import, the circular arc stator is positioned at the centre of residing exhaust branch pipe cross section topmost, the dual-side of circular arc stator all is integral with the inwall of exhaust branch pipe is affixed, the circular arc stator bottom with the outlet of exhaust branch pipe on same cross section, the circular arc stator is divided into the increaser that reducing pipe that sectional area reduces gradually and sectional area enlarge gradually with itself and the contacted part of exhaust branch pipe.The long-pending ratio range of the discharge area of reducing pipe and entrance section is 0.3 to 0.8, and the span of d is Wherein D is the vertical length between the import and export of exhaust branch pipe.

Beneficial effect of the present invention:

The present invention is reasonable in design, and is simple in structure, is not subjected to the restriction of cylinder number, makes motor can obtain more excellent performance in whole load operation scope.

Description of drawings

Fig. 1 is the structural representation of turbo charge system of the present invention;

Fig. 2 is the part outlet pipe and the exhaust branch pipe structural representation of turbo charge system of the present invention;

Fig. 3 is the structural representation of A-A section among Fig. 1;

Fig. 4 is the structural representation of B-B section among Fig. 1.

Embodiment

Below in conjunction with accompanying drawing, concrete enforcement of the present invention is described further.

As Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4, the present invention includes cylinder 1, exhaust branch pipe 2, outlet pipe 6, turbine 7 and circular arc stator 3, cylinder 1 is connected with outlet pipe 6 by exhaust branch pipe 2, turbine 7 is single import, the outlet of outlet pipe 6 is connected with the import of turbine 7, exhaust branch pipe 2 is the reducing pipes that sectional area reduces gradually, the long-pending ratio range of the discharge area of exhaust branch pipe 2 and entrance section is 0.6 to 0.9, circular arc stator 3 is installed in the inside of exhaust branch pipe 2, its the top is d with the perpendicular distance of exhaust branch pipe 2 imports, circular arc stator 3 is positioned at the centre of residing exhaust branch pipe 2 cross sections topmost, the dual-side of circular arc stator 3 all is integral with the inwall of exhaust branch pipe 2 is affixed, circular arc stator 3 bottom with the outlet of exhaust branch pipe 2 on same cross section, circular arc stator 3 is divided into the increaser 5 that reducing pipe 4 that sectional area reduces gradually and sectional area enlarge gradually with itself and exhaust branch pipe 2 contacted parts.Through computation optimization, the long-pending ratio range of the discharge area of reducing pipe 4 and entrance section is 0.3 to 0.8, and the span of d is

Wherein D is the vertical length between the import and export of exhaust branch pipe 2.Circular arc stator 3 is positioned at the centre of residing exhaust branch pipe 2 cross sections topmost, as shown in Figure 3.The outlet of exhaust branch pipe 2 is exactly the outlet of reducing pipe 3 and the outlet sum of increaser 4.When time of engine low load operation, pressure ratio in the outlet pipe 6 is lower, and cylinder 1 is in exhaust during the starting stage, but because the effect of circular arc stator 3, can make very fast that close cylinder head pressure partly rises in the exhaust branch pipe 2, the restriction loss of drain tap is reduced; Spent the exhaust starting stage at cylinder 1, piston promotes exhaust when drain tap flows out, because increaser 5 plays certain diffusion action, exhaust back pressure is reduced to some extent, and the outlet of reducing pipe 4 also can form certain jet, certain drainage is played in the exhaust of increaser 5, thereby reduce pumping loss, the low-load performance of motor is improved.When motor was in high load running, the pressure ratio in the outlet pipe 6 was bigger, and the outlet exhaust flow velocity of reducing pipe 4 is not very big, can not play drainage to the exhaust of increaser 5; But because exhaust branch pipe 2 integral body also are the diminishing reducing pipe of sectional area, can regard pressurization system integral body as the modular pulse converter supercharging system this moment, favourable for high load running, because the existence of circular arc stator 3 is arranged, exhaust air flow is played certain inhibition, but since this moment the pressure in the outlet pipe 6 also than higher, so the existence of circular arc stator 3 is not very big to the whole high load running performance impact of motor.So in exhaust branch pipe 2, add after the circular arc stator 3, can make motor under each operating conditions, can both obtain more excellent performance, and satisfy the requirement of Economy and power character aspect simultaneously.When high engine load is moved,, still play a role for the temperature that reduces cylinder head though the drainage of 4 pairs of increasers 5 of reducing pipe is strong when the low-load.Because circular arc stator 3 is relatively simple for structure, can cast together with exhaust branch pipe, so the present invention also can directly make module type.

Claims

1. guide blade type module type pulse conversion turbocharging system, comprise cylinder (1), exhaust branch pipe (2), outlet pipe (6) and turbine (7), cylinder (1) is connected with outlet pipe (6) by exhaust branch pipe (2), turbine (7) is single import, the outlet of outlet pipe (6) is connected with the import of turbine (7), exhaust branch pipe (2) is a reducing pipe that sectional area reduces gradually, the long-pending ratio range of the discharge area of exhaust branch pipe (2) and entrance section is 0.6 to 0.9, it is characterized in that also comprising circular arc stator (3), circular arc stator (3) is installed in the inside of exhaust branch pipe (2), its the top is d with the perpendicular distance of exhaust branch pipe (2) import, circular arc stator (3) is positioned at the centre of residing exhaust branch pipe (2) cross section topmost, the dual-side of circular arc stator (3) all with affixed being integral of inwall of exhaust branch pipe (2), circular arc stator (3) bottom and the outlet of exhaust branch pipe (2) on same cross section, circular arc stator (3) is divided into the increaser (5) that reducing pipe (4) that sectional area reduces gradually and sectional area enlarge gradually with itself and the contacted part of exhaust branch pipe (2).

2. guide blade type module type pulse conversion turbocharging system according to claim 1 is characterized in that the discharge area of reducing pipe (4) and the long-pending ratio range of entrance section are 0.3 to 0.8, and the span of d is

Wherein D is the vertical length between the import and export of exhaust branch pipe (2).