a gas mixer

Abstract

The invention discloses a gas mixer. The gas mixer comprises a mixer core body and a whirlwind disk assembly on the inner side. The mixer core body comprises an EGR core body with holes formed in thecircumferential direction. The whirlwind disk assembly comprises a plurality of whirlwind units distributed in the circumferential direction of the EGR core body. Each whirlwind unit comprises a whirlwind sheet and a fixed supporting column extending in the radial direction of the EGR core body. The ends, facing air inlets of the mixer core body, of the whirlwind sheets rotate around and are matched with the supporting columns. Acting force applied to the whirlwind sheets by elastic components between the whirlwind sheets and the supporting columns drives the whirlwind sheets to rotate in thedirection of reducing the flow area of the EGR core body. Each whirlwind unit further comprises a positioning structure used for limiting the rotating angle of the whirlwind sheets. A turbine type whirlwind sheet combined structure with changeable whirlwind strength is adopted. Pressure drop of an inlet and an outlet of the mixer is reduced and whirlwind is generated by the mixer, and the mixing effect is improved. The strength of the whirlwind can be automatically adjusted based on air side flow change, high-speed rotating and low-speed rotating are both achieved, and mixing uniformity of anengine in different working conditions is greatly improved.

Description

technical field [0001] The invention relates to the technical field of gas mixers for gas engines, in particular to a gas mixer. Background technique [0002] The mixing uniformity of natural gas, air, and EGR (Exhaust Gas Recycle, exhaust gas recirculation) has a significant impact on the power, economy, and emissions of natural gas engines. During the intake process of the engine, if the mixture is not uniformly distributed, the amount of gas distributed to each cylinder through the intake pipe is inconsistent, which will inevitably lead to problems such as uneven operation, knocking, and misfire in each cylinder of the engine. Therefore, the uniformity of the mixed gas is one of the important indicators for evaluating the mixer. With the escalation of emission regulations, the demand for EGR rates is also increasing. Pulse exhaust systems are commonly used today to increase the EGR rate. If the EGR is not mixed uniformly, it will further aggravate the working instabili...

AI Technical Summary

Problems solved by technology

[0008] (1) The windward area of ​​the mixing core is large, and the pressure loss at the inlet and outlet of the mixer is large;

[0009] (2) The swirling effect is poor, and the mixed gas at the outlet of the mixer is not sufficiently mixed and distributed unevenly;

[0010] (3) The swirl intensity cannot be adjusted, and it is difficult to have a good mixing effect and a low inlet and outlet pressure drop at all speeds

Images