Air motor

A pneumatic motor, also called a pneumatic motor, refers to a device that converts pressure energy of compressed air into rotational mechanical energy. It is generally used as a source of rotational power for more complex devices or machines. Pneumatic motors are classified according to the structure: vane air motors, piston air motors.

Basic introduction The pneumatic actuator converts the pressure energy of the compressed gas into mechanical energy and generates a rotary actuator. The commonly used pneumatic motor is a volumetric air motor, which utilizes the volume change of the working chamber to perform work such as vane type, piston type and gear type.

Air motors are devices that convert the pressure energy of compressed air into rotational mechanical energy. Its role is equivalent to a motor or a hydraulic motor, that is, output torque to drive the mechanism for rotational movement.

Classification of Pneumatic Motors The most commonly used pneumatic motors are vane type (also called slide type), piston type, and film type. (Blade air motors and piston air motors are the most commonly used on the market today).

Compared with the characteristics of the vane air motor and the piston air motor, the vane type air motor has a slightly higher rotational speed and the piston type pneumatic motor has a slightly lower rotational speed, but the pneumatic motor has a relatively high rotational speed with respect to the hydraulic motor. The torque is small.

Working Principle of Air Motor Compressed air is divided into two ways when it is input from hole A: All the way through the slots at the two ends of the stator into the bottom of the blade (not shown in the figure), the blade is pushed out, the blade is relying on this pressure thrust and the centrifugal force after the rotation of the rotor The combined action closely adheres to the inner wall of the stator. The other way of compressed air passes through the hole and enters the corresponding sealed working space and acts on the two blades. Since the protruding length of the two blades is not equal, a torque difference is generated, so that the blade and the rotor are rotated counterclockwise; after work The gas is discharged from the hole C in the stator and the residual gas is discharged through the hole. If you change the direction of compressed air input (that is, compressed air entering from hole B, hole A and hole C), you can change the direction of rotation of the rotor. Figure b is a schematic of a radial piston air motor. Compressed air enters the cylinder through the air inlet and then enters the cylinder to push the piston and connecting rod assembly to move and then crank the crankshaft. At the same time as the crankshaft rotates, the distribution valve driven on the crankshaft is driven to rotate synchronously so that the compressed air enters into different cylinders as the angular position of the distribution valve changes, which in turn urges each piston to move and the crankshaft and the connecting rod drive the crankshaft. Continuous operation, at the same time, the cylinder corresponding to the intake cylinder is in the exhaust state.

It is actually a film-type cylinder. When it reciprocates, the ratchet is rotated by the pawl at the end of the push rod.

Advantages and Disadvantages of Air Motors Air motors are characterized by their lighter housing and easier transportation than their counterparts. They also have the advantage of being light because of the air in their working medium, and they do not have to worry about causing fire; they can automatically stop when the air motor is overloaded. , while maintaining balance with supply pressure. Because of the above characteristics, pneumatic motors are widely used in mining machinery and pneumatic tools.

Compared with pneumatic motor and hydraulic motor:

1) Advantages (1) Work safety, explosion-proof performance, and no influence of high temperature and vibration;

(2) Work can be fully loaded for a long period of time with a small increase in temperature;

(3) The power range and speed range are relatively wide. The power is as small as several hundred watts and as large as tens of thousands of watts. The rotation speed can be changed from several minutes per minute.

(4) High starting torque. Can carry start;

(5) Simple structure, convenient operation, easy maintenance and low cost. 2) Disadvantages (1) Poor speed stability;

(2) Low output power, low efficiency, and large air consumption;

(3) The noise is high and it easily generates vibration.

Characteristics of Air Motors Motors separate air motors, starters, hydraulic motors, electric motors, swing motors, etc.

Pneumatic motors use air compressed air to drive the motor, which in turn compresses air into mechanical energy. Lishui Zhengwei mechanical air motor is still relatively good.

The starter motor is the motor that was used to start the engine when it was first started on the generator or engine (I'm talking about the more popular).

Hydraulic motor, this principle is similar to the air motor, that is, the compression energy of hydraulic oil can be converted into mechanical energy.

Electric motors, which are more common in life, convert electricity into mechanical energy.

The following mainly introduces the air motor:

A pneumatic motor is a prime mover using compressed air as a working medium, and it is a power device that converts pressure energy into mechanical energy using the expansion effect of compressed gas.

Although all types of air motors have different structures and work principles, most air motors have the following features:

1. Stepless speed regulation. As long as the opening of the intake valve or the exhaust valve is controlled, that is, the flow of the compressed air is controlled, the output power and the rotational speed of the motor can be adjusted. It can achieve the purpose of adjusting the speed and power.

2. It can be reversed if it can be turned. Most air motors simply use the control valve to change the direction of motor intake and exhaust, that is, the forward and reverse rotation of the output shaft of the air motor can be achieved and can be instantaneously reversed. In the forward and reverse conversion, the impact is small. A major advantage of the commutation operation of an air motor is that it has the ability to rise to full speed almost instantaneously. The vane air motor can be raised to full speed in half a second; the piston air motor can reach full speed in less than one second. Positive and negative reversals can be achieved by changing the intake direction using the control valve. The time to achieve positive and negative reversal is short, the speed is fast, the impact is small, and no load is required to be unloaded.

3. Work safety, not affected by vibration, high temperature, electromagnetic, radiation, etc., applies to the harsh working environment, and can work normally under flammable, explosive, high temperature, vibration, humidity, dust and other unfavorable conditions.

4. With overload protection, it will not malfunction due to overload. When the motor is overloaded, the motor only reduces or stops the rotation speed. When the overload is released, the motor can be resumed normal operation immediately without any damage such as damage to the engine. It can run continuously for a long time and its temperature rise is small.

5. With a high starting torque, it can be started directly with a load. Start and stop quickly. Can start with load. Start and stop quickly.

6. Wide power range and speed range. Power is as small as several hundred watts, as large as tens of thousands of watts; speed can be from zero to 10,000 rpm.

7. Easy to operate, easy to maintain and overhaul The air motor has a simple structure, small size, light weight, high horsepower, easy operation, and easy maintenance.

8. The use of air as a medium has no supply difficulties. The used air does not need to be disposed of. It can be put into the atmosphere without pollution. The compressed air can be supplied centrally and transported over long distances.

Because the air motor has many features, it can work in harsh environments such as humidity, high temperature, and high dust. In addition to being used as power for drilling, drilling, and loading in mining machinery, ships, metallurgical, chemical, and papermaking industries are also widely used.

Air motor air motor is the best alternative to explosion-proof motors In addition to the standard models, we also have a model of aerodynamic gearmotors equipped with a reducer, with a reduction ratio from 10:1 to 60:1.

Features include:

1) variable speed;

2) Explosion-proof - no power spark;

3) operation does not heat;

4) Will not burn out;

5) Both positive and negative directions are possible.

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