Mechanical valve and pneumatic valve pulse combustor
    According to the fuel and air into the combustion chamber of the way, but also the pulse combustor divided into mechanical valve pulse combustor (diaphragm valve, reed Yan and rotary valve 3 kinds) and pneumatic diode pulse combustor (or called valveless pulse combustor). One-way flow valve is a pulse combustor basic features. Positive pressure state in the pulsating combustion, combustion products, mechanical valves are set up a barrier to reflux. That require low power input, high open degree (maximum and minimum output of the brain of the ratio) in the case, the mechanical valve has outstanding advantages.
    1 diaphragm valve
    Also called diaphragm valve flap valve. Usually vented disc valve, the diaphragm and the stopper plate components. Diaphragm valve is small power applied pulse combustor more of a valve, its working principle is: When the valve is greater than the right to the left gas pressure in the gas pressure, the pressure differential between the force of the pressure to the diaphragm Let moving plate, air or gas fuel through the valve seat into the hole on the chassis base plate between the diaphragm and Yan space formed by the stopper plate in the waist-shaped hole and the stopper plate and the inner wall of the formed body circular cross-section and into the combustion chamber. Air and gas mixture in the combustion chamber, the combustion chamber pressure rise rapidly. At this time, the valve of the gas pressure is greater than the left side right side gas pressure, the diaphragm is pressed against the valve plate, cover the ventilation
Hole, thereby cutting off a reverse flow of air. There stopper plate on the valve to prevent the erosion of the flame effect.
    When the pulse combustor designed structure, the air and gas flow rate regulating valve can increase or decrease the gap that the flow area of ​​the diaphragm to achieve Yan. In the pulse combustor, the air valve important than the gas valve, it directly affects the reliability of the start pulse combustor, operating stability and operating frequency. Air valve into the gas and air diaphragm valve structure size, density, and the combustion chamber diaphragm pressure pulsation frequency and other parameters related to air flow through the various parameters on the analysis of the impact on the air valve can be optimized based sauce. The diaphragm should be met: density, material flat, flex resistance, thermal deformation, in order to ensure its service life, the most commonly used membrane materials: PTFE, resin plate, stainless steel and spring steel sheet (0.1- 1mm).
    2 reed valve
    Reed valve is the earliest and used a one-way valve, reed and single reed how two structural forms. When the inlet pressure is greater than the air inside the combustion chamber pressure, air flow reed red open combustion air into the combustion chamber provided; when the combustion heat makes the combustion chamber where the gas pressure is higher than the inlet air pressure, open the valve reed channel is closed. Combustion products only through the tail pipe emissions, the main problem is that the reed valve due to high vibration reed valve working conditions, easy fatigue failure, short life. In recent years, development of materials science provides a new type of high fatigue strength metal materials and fluorine plastics and other non-metallic materials, help to improve the life of the reed, reed-type check valve is still a simple structure, reliable operation The one-way valve.
    3 rotary valves
    Rotary valve function and the diaphragm / reed-type check valve the same, i.e., when the combustion chamber pressure is greater than the intake pressure, the intake channel seal, preventing combustion chamber pressure gas reflux. A rotary valve design includes two plates: a motor driven rotating plate and a dish 180 degrees apart drilled two long holes stationary plate. The air needed for combustion in the direction of rotation is perpendicular to the rotary valve, into the combustion chamber. Depending on the still area of ​​the air inlet plate height and width of the long hole. A cylinder head of the combustion chamber wall, opened along the circumference a number of uniform radial through hole formed seat, in its outer sleeve with a coaxial valve with simple turn, connected to the open drum with the corresponding hole in the valve seat. Motor driven rotary valve cylinder, when the two holes opposite, the air entering the combustion chamber through the hole; when two holes staggered, the air passage is blocked, the combustion chamber
High-pressure gas can not turn the clock back.
Rotary valve has a durable, adaptable, resistant to oil and dirt build-up characteristics, its design, manufacture and burner design independent and can adapt to a wide range of operating frequency and the burner firing rate. However, the speed of the valve determines the operating frequency of pulse combustor, and thus require a "feedback" device so that the combustion speed of the resonance frequency synchronization. When the rotational speed of the valve and the burner resonant frequency is not synchronized, this is called frequency adjustable burner of the "pulse" Burner. "Heartbeat" is a cyclical burner combustion, but non-resonant and self-priming apparatus of the rotary valve for controlling the inflow of air and gas in the order, the operating frequency is usually lower than the resonance frequency of the burner.
    4 pneumatic valve
    Pneumatic valve is the use of a specially designed inlet fluid into the performance of the flow characteristics of the combustion products to achieve a reflux hindered (i.e., a valveless). The structure of the main advantages are: no moving parts, thereby avoiding the mechanical failure or mechanical damage, such as a burner can be used for heavy operations inlet member harsh environment applications. Pneumatic valves designed to prevent the return should be maximized, while the fluid flow to minimize
Obstacles. One approach is called the entrance of a "fluid diode," the device, but the operation of such devices is less than the mechanical valve, it can not completely prevent backflow. The size of the return flow limitation Another method is designed to be shaped cross section of the inlet. Spread gradually flared entrance to the combustion chamber, the air flow entering the first acceleration, and then the gas stream before entering the diffusion chamber. At reflux, this structure effectively acts as the role of the nozzle, thus minimizing back flow.

 

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