A single screw pump is a positive displacement pump, according to the number of screw can be divided into single screw pump, double single screw pump, three single screw pump and five single screw pump and several other, their working principle is basically the same, the difference is the number of screws, The geometry of the screw differs from the conveying medium.
　　
First, the working principle and structure of single screw pump
　　
Single screw pump. Single-screw pump is by intermeshing screw rotation for suction liquid. Due to the intermeshing of the screws and the close cooperation of the screw with the inner wall of the liner, the suction and discharge of the pump are separated into one or more sealed spaces. As the screw is rotated and engaged, these sealed spaces are constantly formed at the suction side of the pump, sealing the liquid in the suction chamber therein and continuously sliding in the axial direction of the screw from the suction chamber to the discharge side, The fluid in the space is continually expelled as if a nut were constantly pushed forward as the thread was turning.
　　
Second, the characteristics of a single screw pump
　　
Compared with other pumps, single screw pump has many advantages: single screw pump loss, good economic performance; high pressure and uniform, uniform flow, high speed, direct connection with the prime mover; single screw pump can transport lubricants, transport Fuel, transport a variety of oils and polymers for the transport of viscous body.
　　
â‘ pressure and flow stability, minimal pulsation. Medium in the pump for continuous and uniform linear flow, no mixing.
　　
â‘¡ self-priming capability, do not need the bottom valve or vacuum-attached ancillary equipment.
　　
â‘¢ work stable, low noise.
　　
â‘£ Intermeshing screw wear very little, high efficiency, long life.
　　
⑤ simple structure, compact, small size, easy disassembly.
　　
The disadvantages of single screw pump: Sludge screw pump tooth type complex, high precision machining.
　　
Third, single screw pump common fault and troubleshooting
　　
Single screw pump common fault and troubleshooting.
　　
1. The pump does not absorb oil: â‘ Suction pipe is blocked or leaked â‘¡ Inhalation height exceeds the allowable suction vacuum degree â‘¢ Motor reversal â‘£ Medium viscosity is too large
　　
The solution: â‘ maintenance suction pipe â‘¡ reduce the suction degree â‘¢ change the motor steering â‘£ the media warming
　　
2. Gauge pressure gauge fluctuations: â‘ suction pipe leaks â‘¡ safety valve is not adjusted so that the safety valve open when closed â‘¢ working pressure is too large, so that when the safety valve open
　　
The solution: â‘ suction pipe repair â‘¡ adjust the safety valve â‘¢ adjust the working pressure
　　
3. Flow decline: ①suction enough pressure head ② suction pipe plugging or leakage ③ screw and pump sleeve wear ④ safety valve spring is too loose or valve and seat contact lax ⑤ motor speed is not enough
　　
The solution: ①increase the surface of the man-machine suction pipe, plugging, leakage ③ severe wear and tear should be replaced parts ④ adjust the spring, grinding valve and seat ⑤ repair or replace the motor
　　
First, the working principle and structure of single screw pump
　　
Single screw pump. Single-screw pump is by intermeshing screw rotation for suction liquid. Due to the intermeshing of the screws and the close cooperation of the screw with the inner wall of the liner, the suction and discharge of the pump are separated into one or more sealed spaces. As the screw is rotated and engaged, these sealed spaces are constantly formed at the suction side of the pump, sealing the liquid in the suction chamber therein and continuously sliding in the axial direction of the screw from the suction chamber to the discharge side, The fluid in the space is continually expelled as if a nut were constantly pushed forward as the thread was turning.
　　
Second, the characteristics of a single screw pump
　　
Compared with other pumps, single screw pump has many advantages: single screw pump loss, good economic performance; high pressure and uniform, uniform flow, high speed, direct connection with the prime mover; single screw pump can transport lubricants, transport Fuel, transport a variety of oils and polymers for the transport of viscous body.
　　
â‘ pressure and flow stability, minimal pulsation. Medium in the pump for continuous and uniform linear flow, no mixing.
　　
â‘¡ self-priming capability, do not need the bottom valve or vacuum-attached ancillary equipment.
　　
â‘¢ work stable, low noise.
　　
â‘£ Intermeshing screw wear very little, high efficiency, long life.
　　
⑤ simple structure, compact, small size, easy disassembly.
　　
The disadvantages of single screw pump: Sludge screw pump tooth type complex, high precision machining.
　　
Third, single screw pump common fault and troubleshooting
　　
Single screw pump common fault and troubleshooting.
　　
1. The pump does not absorb oil: â‘ Suction pipe is blocked or leaked â‘¡ Inhalation height exceeds the allowable suction vacuum degree â‘¢ Motor reversal â‘£ Medium viscosity is too large
　　
The solution: â‘ maintenance suction pipe â‘¡ reduce the suction degree â‘¢ change the motor steering â‘£ the media warming
　　
2. Gauge pressure gauge fluctuations: â‘ suction pipe leaks â‘¡ safety valve is not adjusted so that the safety valve open when closed â‘¢ working pressure is too large, so that when the safety valve open
　　
The solution: â‘ suction pipe repair â‘¡ adjust the safety valve â‘¢ adjust the working pressure
　　
3. Flow decline: ①suction enough pressure head ② suction pipe plugging or leakage ③ screw and pump sleeve wear ④ safety valve spring is too loose or valve and seat contact lax ⑤ motor speed is not enough
　　
The solution: ①increase the surface of the man-machine suction pipe, plugging, leakage ③ severe wear and tear should be replaced parts ④ adjust the spring, grinding valve and seat ⑤ repair or replace the motor
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