China Pumping Solutions Leader
Working principle of pneumatic diaphragm pump: structure, characteristics and application
Pneumatic diaphragm pump, also known as air diaphragm pump or compressed air diaphragm pump, is a pump that uses compressed air or other compressible gas as a power source. The pump has the advantages of simple structure, easy operation, no spark, no power demand, etc., and is widely used in chemical, petroleum, pharmaceutical, food and other fields. This paper will introduce the working principle, structure characteristics and application field of pneumatic diaphragm pump in detail.
First, the working principle
The working principle of the pneumatic diaphragm pump is based on compressed air driving the diaphragm to do reciprocating movement in the pump body, so as to achieve the suction and discharge of liquid. The specific process is as follows:
When the compressed air enters the pneumatic part of the pneumatic diaphragm pump, it first pushes a diaphragm to move in the other direction, so that one chamber of the pump produces negative pressure, thus opening the suction valve and drawing the liquid into the pump.
The compressed air then passes through a pneumatic valve in the pneumatic section, driving another diaphragm in the opposite direction. At this time, the diaphragm in the chamber that originally produced negative pressure moves, so that the liquid is discharged out of the pump through the discharge valve under the action of pressure.
With the continuous switching of the pneumatic valve in the pneumatic part, the two diaphragms move alternately to achieve continuous and uninterrupted liquid transportation.
Second, structural characteristics
The main structure of the pneumatic diaphragm pump includes the pneumatic part, the pump body part and the diaphragm. The following are the structural characteristics of the pneumatic diaphragm pump:
Pneumatic part: The pneumatic part consists of a pneumatic valve, an air chamber and a driving diaphragm. The pneumatic valve is responsible for controlling the flow of compressed air and driving the diaphragm to do reciprocating movement in the pump body.
Pump body part: The pump body part is composed of two chambers, suction valve and discharge valve. The chamber is equipped with a diaphragm, and the suction valve and the discharge valve are responsible for controlling the flow of liquid.
Diaphragm: The diaphragm is the core component of the pneumatic diaphragm pump, which is responsible for isolating the compressed air in the pump body from the transported liquid. Diaphragms are usually made of high-strength, corrosion-resistant materials, such as polytetrafluoroethylene, nitrile butadiene rubber, fluorine rubber, etc.
Iii. Characteristics
Pneumatic diaphragm pump has the following characteristics:
No power supply: Because the pneumatic diaphragm pump uses compressed air as a power source, no power supply is required, and it is suitable for special environments such as flammable and explosive.
Self-priming capacity: The pneumatic diaphragm pump has a strong self-priming capacity, which can be self-primed without relying on external equipment.
High viscosity and granular liquids can be transported: pneumatic diaphragm pumps can transport liquids with high viscosity and particles, and are not easy to clog.
Can achieve dry operation: in the absence of liquid, the pneumatic diaphragm pump can be dry operation without damaging the pump body.
Easy to adjust: By adjusting the compressed air pressure into the pump, the flow rate and discharge pressure of the pump can be easily adjusted.
4. Application field
Pneumatic diaphragm pumps have a wide range of applications in many fields, such as:
Chemical industry: Pneumatic diaphragm pump can transport a variety of corrosive, flammable and explosive and toxic chemical liquids.
Oil: Pneumatic diaphragm pump can be used to transport crude oil, diesel oil, lubricating oil and other petroleum products.
Pharmaceutical: Pneumatic diaphragm pump can be used to transport a variety of liquid medicine, apis and biological products.
Food: Pneumatic diaphragm pump can be used to transport juice, alcohol, seasonings and other food liquids.
Mineral: Pneumatic diaphragm pump can be used to transport pulp, wastewater and other mining liquids.
Water treatment: Pneumatic diaphragm pump can be used in sewage treatment, waste water recycling and other water treatment fields.
In summary, pneumatic diaphragm pump with its simple working principle, unique structural characteristics and a wide range of applications, has become an indispensable pump in modern industry.
