Turbocharger with circumferential deflation function

Abstract

The invention discloses a turbocharger with a circumferential deflation function. The turbocharger with the circumferential deflation function comprises a turbine case and a deflation valve assembly; the turbine case is provided with an exhaust gas outlet connected with a flange; the wall of the turbine case is provided with a bypass gas discharge hole communicated with an exhaust gas channel of the turbine case; the deflation valve assembly comprises a pressure valve, a connecting rod and a linkage crank; the bypass gas discharge hole is of an elongated oval shape; the inner circumferential wall of the exhaust gas outlet, which is connected with the flange, is connected with a round rotatable deflation piece and a round fixed deflation piece; the round rotatable deflation piece is circumferentially provided with a plurality of first gas discharge through holes communicated with the bypass gas discharge hole; the round fixed deflation piece is circumferentially provided with a plurality of second gas discharge through holes; the first gas discharge through holes correspond to the second gas discharge through holes in positions; a transmission mechanism capable of driving the round rotatable deflation piece to rotate is arranged between the round rotatable deflation piece and the linkage crank. The turbocharger with the circumferential deflation function has the advantage of achieving the change of deflation amount to discharge sufficient exhaust gas in a bypass mode by changing the overlap of the first gas discharge through holes and the second gas discharge through holes.

Description

technical field [0001] The invention relates to a supercharging device, in particular to a turbocharger with a circumferential air discharge function. Background technique [0002] The goal of today's engines is to require low speed and high torque, which requires the turbocharger to output greater energy when the engine is at low speed, that is, when the engine displacement per unit time is small, which requires the turbocharger The flow area of ​​the turbine box is small, so that a large expansion ratio can be established under the condition of small flow. However, when the engine is at high speed, there is also a high power requirement. When the engine is at high speed, that is, when the exhaust volume per unit time is large, the too small flow area cannot meet the exhaust requirements. A portion of the exhaust gas is directed into the exhaust pipe without passing through the turbo case. [0003] However, existing common turbochargers such as figure 1 and figure 2 As...

AI Technical Summary

Problems solved by technology

When this turbocharger is working, the pressure of the pressure valve 61 can be adjusted to change the opening of the bleed valve 64 to realize the waste gas bypass of the turbine box, but it has the following problems: 1) due to the processing problem of the bleed valve And the location problem, the air release valve can only be made into a circle, so in order to cover the bypass air release hole, the bypass air release hole can only be made into a circle (such as figure 2 As shown), and limited by the position of the exhaust flow channel of the turbo box, the bypass vent hole cannot be made too large, and the maximum diameter can only reach the width of the exhaust flow channel, which limits the amount of air release; 2) due to the exhaust valve When it is opened, it hinders the normal flow of bypass exhaust gas, so the exhaust gas cannot bypass smoothly, and the exhaust gas can only bypass into the exhaust pipe after a significant turning point, which further affects the amount of exhaust gas; 3) due to the very limited amount of exhaust gas , so when the exhaust volume is large, enough exhaust gas cannot be released as required, and the excess exhaust gas still passes through the turbo box, and because the flow area of ​​the turbo box is too small, the excess exhaust gas will increase the turbo pressure when passing through the turbo box , which will cause the exhaust pressure of the engine to be too high, and eventually cause the engine pumping loss to be too large and the engine power to drop; 4) Since the air pressure of the exhaust gas is the exhaust pressure of the engine, it is relatively large, so the exhaust gas acts on the exhaust valve However, due to the change of the opening angle and the exhaust pressure of the engine, the pressure acting on the bleed valve is often changed, so that the pressure of the bypass exhaust gas changes from the maximum to the minimum opening. The control force of the valve is unstable

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