Many types of multi-stage pump, but the same principle of work, the structure is similar. The main components are a rotating impeller and a fixed pump housing. The impeller is a component that works directly on the liquid. There are 4-8 blades on the back, and the pump casing is a scroll-shaped energy conversion device. Multi-stage pump must first be filled with the liquid to be sent to the shell before starting. After starting, the pump shaft drives the impeller to rotate together to force the liquid between the blades to rotate. Under the action of inertial centrifugal force, the liquid is thrown to the periphery from the center of the impeller and energy is obtained, which increases the static pressure of the liquid flowing to the periphery of the impeller and increases the flow rate up to 15-20 m / s. After the liquid leaves the impeller and enters the pump casing, the liquid is decelerated due to the gradual enlargement of the flow passage in the casing, and some kinetic energy is converted into static pressure energy. As long as the impeller is constantly rotating, the liquid is continuously aspirated and discharged. The reason why multi-stage pump can transport liquid, mainly rely on high-speed rotating impeller, the liquid in the inertial centrifugal force to gain energy to improve pressure. Multistage pumps are driven with a large area piston low pressure gas (2-8 bar) to generate high pressure gas / liquid on a small area piston. Can be used for compressed air and other gases, the output pressure can be steplessly adjusted by the driving pressure. Multi-stage gas pipeline pump has a single role of the pump and double-acting pump. The double-acting pump piston compresses the gas in both strokes. When the driving gas is applied to the gas piston, the working piston can be driven with gas to obtain a larger output flow rate. Multi-stage pump has the following characteristics: 1. Simple maintenance: multi-stage pump parts and sealing less, simple maintenance and low cost with the pressure increase. 2. Cost-effective: Multi-stage pump with high output performance and low cost characteristics. 3. Adjustability: multi-stage pump output pressure and flow are driven by gas pressure regulating valve accurately adjusted. Adjust the driving pressure so that the output pressure of the multistage pump of the pneumatic pipe is precisely adjusted between the pre-boost pressure and the maximum output pressure. 4. High output pressure: the maximum working pressure of pneumatic liquid pipe multistage pump can reach 700Mpa, the maximum working pressure of multistage pump of pneumatic gas pipe can reach 300 Mpa. 5. Material: multi-stage high-pressure pump made of hard aluminum alloy. High pressure plunger material is stainless steel. Double sealed. The material of the key parts can be selected according to the media system. 6. A variety of gas-driven: compressed air, nitrogen, water vapor and so on. 7. Large output flow: multi-stage pneumatic pipe pump only 0.2-0.8Mpa compressed air. All "O" rings of the same series of pumps, replaceable consumable parts for service packs, greatly reducing maintenance costs. Pneumatic multi-stage pump without the use of lubricants. 8. Flexible application: Multi-stage pump from simple manual * to fully automatic * Made for multi-stage pump for various applications, and to facilitate and customer support system compatible. The air motors for most models of pumps in the same series are interchangeable. 9. Auto-packing: When working, multi-stage pump reciprocates quickly, with the output pressure close to the set pressure value, the pump reciprocating speed decreases until it stops. And to maintain this pressure, then the energy consumption is very small, no heat, no parts movement. When the pressure balance breaks the multi-stage pump automatically starts to work to the next balance.
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