Difficulties in ensuring a good mixture of gas and air:
- pressure resistances or negative pressure on the gas line
- intermittent overpressure on the gas line
- pulsating engine suction
- changing the quality of the gas
Vacuum on the gas line:
To a large extent, this would be solved by a diaphragm, which actually transfers the pressure conditions from the gas line to the air line, there is also a lever with which we adjust the tension of the auxiliary spring, thus enriching the combustible mixture.
Gas line overpressure:
The moving element in the mixer tightly closes the gas supply to the intake manifold until the engine starts the intake cycle, at which time air also enters in addition to the gas, because the gas overpressure also loosens the spring on the air valve and thus almost equalizes the conditions in the mixer work and the mixture is good
Pulsating engine suction:
The moving element will be made of light plastic, which will ensure a quick, easy opening and just as quick closing of the mixture, which will allow a good filling of the engine. The leading axle will have a small diameter, which allows easy movement and jams are almost impossible.
Changing gas quality:
The driver or operator has the option of “damping” the air by increasing the spring tension behind the air flap, thus enriching the mixture.
Please alert me to any other problems that I have not taken into account.
A little more physics to spice it up, the definition of pressure is the force on the surface and if we study the mixing of two gases in the same ratio and this ratio is maintained from the min flow to the max flow, the cross-section between the inlet opening of the gas and the air at the point of mixing should be the same, no depending on the size of the flow. At the same time, it is necessary to maintain the same pressure of both gases at this point, this is partly done during the preparation with a throttle valve and membrane for equalization, and the greater part is provided by the moving element, which is affected by the pressure and gas flow, and this determines the size of the offset and with this the size of the cross-section of the openings of the two gases and if you imagine, you can find that the pressure of the two gases will also be relatively equal at the point of mixing.