The air hanging butterfly valve is an elastic element that uses the reaction force of compressed air of the electric butterfly valve wired with a built-in curtain to isolate vibration. The air suspension consists of air chamber, auxiliary air chamber, upper platen, suspension base, stop block and other parts. The air suspension is filled with compressed air to provide elastic force, so as to achieve the purpose of vibration reduction. Air is an important part of air suspension. The high-strength fiber layer is vulcanized between layers as the framework for air suspension, and is supported and protected by the stop block.
1： Classification of electric butterfly valves
According to different empty working modes, vehicle air suspension can be divided into two categories: bag type air suspension and membrane type air suspension. The bladder type air suspension is a round lantern shaped structure, and its deflection can be formed by one or several layers in series, which are respectively called single curved bladder type air suspension, double curved bladder type air suspension or multi curved bladder type air suspension. The membrane air suspension is also a cylindrical structure, which can be divided into two types: confined membrane air suspension and free membrane air suspension. The confined membrane air suspension is sealed by bolt clamping, while the free membrane air suspension is sealed by pressure in the air suspension. In the early days, the air suspension for vehicles was mainly double curved bladder type and triple curved bladder type. With the progress of people's requirements for vehicle ride comfort and body function, the membrane type air suspension has been widely used in passenger cars and trucks due to its excellent function.
2： Electric butterfly valve spot
1. The stiffness of the air suspension can be adjusted by changing the air pressure inside, for example, adding auxiliary air chamber to the air suspension to increase the volume of the air suspension, thereby reducing the stiffness of the air suspension and achieving the purpose of vibration reduction and noise reduction.
2. Compared with traditional metal hanging, air hanging has a long service life. The test shows that the fatigue life of the air suspension can reach 4 million times, while the fatigue life of the steel plate metal suspension is only 500000 times.
3. The stiffness of the air suspension changes with the change of vehicle load, which can achieve a constant natural frequency under any load and obtain excellent damping function. However, the ordinary metal butterfly valve suspension cannot change its own stiffness, so its natural vibration frequency varies widely with the change of vehicle load, and it is difficult to design a vehicle suspension system with good performance.
4. For air suspension, different bearing capacities can be obtained by changing the inflation pressure. Therefore, the air suspension can meet the requirements of various loads of the vehicle, and has a good use function. In addition, the height control valve can be adjusted to make the air suspension have different body heights under a certain load, so as to improve its passing function.
5. The air suspension has excellent nonlinear elasticity and can design an ideal performance curve. For example, in the vehicle suspension device, the ideal inverted/S0 function curve is reasonably configured with the suspension stiffness, so as to ensure that the suspension is soft when the vehicle is running normally, and the stiffness is increased under the conditions of sharp turns, uneven roads and braking, which can limit the displacement and large vibration of the vehicle body, so that the vehicle has excellent functions. The ordinary metal suspension, because the performance curve is linear, must affect the vibration isolation and limit function of the vehicle.
6. The manufacturing process of air suspension is complex and needs sealing, so the cost is high.
3： Development of Automobile Air Valve
In 1847, American John Lewis invented the air suspension. After that, William RFee, HoaglandIW and others studied the tightness of the air suspension and designed the air suspension for vehicles. In the 1930s, Firestone Company applied air suspension to cars for several times and achieved good results. In 1944, General Motors Corporation of the United States cooperated with Firestone Corporation to install air hangers on passenger cars for. times. The test results show that the air hangers are excellent and have good vibration and noise reduction effects. General Motors began to produce passenger cars equipped with air suspension in batches in 1953, which pioneered the use of air suspension in commercial vehicles. With the emergence of synthetic polymers, air suspension has been widely used in commercial vehicles. With the maturity of air suspension technology, air suspension technology has also been developed rapidly in Europe. In 1955, the Federal Republic of Germany began to manufacture passenger cars equipped with air hangers. By 1964, the vast majority of more than 50 large and medium-sized passenger cars produced in the Federal Republic of Germany were equipped with air hangers. In the following years, air suspension on passenger cars has developed rapidly. Since the 1980s, based on the consideration of reducing the damage of heavy trucks to highway pavement, many developed countries have conducted extensive and in-depth theoretical research on the mechanism of vehicle road interaction.
The research results show that the heavy truck with air suspension system can reduce the damage to the road. On this basis, the concept of road friendly suspension is proposed. Nowadays, the air suspension has been widely used in commercial vehicles. The air suspension has a broad prospect of development and is increasingly recognized by vehicle design staff.