When high pressure screw pump is operating, the active screw rotates in a certain direction, causing the driven screw to rotate accordingly. The cavity formed by the tooth cavities at the suction port expands from small to large, drawing in liquid. When the cavity reaches its maximum size, it is sealed by the meshing teeth and tooth cavities. The oil in the sealed cavity moves axially toward the discharge port. At the discharge port, the cavity gradually decreases in size, allowing the liquid to be discharged.
Structural decomposition
- Triple-screw structure: Utilizing a low-pressure balancing mechanism for the axial force of the master and slave screws, the force is evenly balanced. As the screw rotates, the medium moves along the spiral grooves toward the outlet.
- Seal: A skeleton seal is used, ensuring that the seal chamber pressure is connected to the suction pressure. The design ensures a leak-free seal.
- External Structure: Includes an integrated pump liner, front cover, and rear cover.
- Relief Valve Assembly: The relief valve provides instant protection against overloads in the High pressure screw pump, but cannot be used as a pipeline relief valve.
Scope of application
- Used as fuel, fuel supply, and transfer pumps in heating equipment.
- Used as hydraulic, lubrication, and remote motor pumps in the machinery industry.
- Used as loading, transfer, and liquid supply pumps in the chemical, petrochemical, and food industries.
- Used as transfer, boosting, fuel injection, and lubrication pumps on ships, as well as marine hydraulic system pumps.
Type of conveying medium
| Medium | Alubricating liquid | ||||
| Lubricant | Water glycol | Vegetable oil | Heavy oil | Residual oil | |
| Applicability | ☆☆☆ | ☆☆☆ | ☆☆☆ | ☆ | ☆ |
| Medium | Low lubricating lisuid | ||||
| Light diesel oil | Heacy diesel | Waxy thin oil | |||
| Applicability | ☆ | ☆ | ☆ | ||
| Medium | Viscous liquid | ||||
| All kinds of synthetic rubber | Artificial glue | Emulsion | Lubricationg grease | ||
| Applicability | ☆ | ☆ | ☆ | ☆ | |
Note: "☆☆☆ " It means recommended to be used, and "☆ " it means to be used under the guidance of technical personnel.
Performance requirements
- Medium requires lubricity or partial lubricity
- Medium requires no solid particles
- Flow range:10-3600L/min
- Working pressure:≤4.0Mpa
- Speed requirements:500-3000r/min
- Range of viscosity: 3-750mm2 /s
- Use of temperature:-5-150℃
- Allowed suction height:≤8m
Screw pump installation method
Horizontal installation
Vertical installation
Immersion installation
Immersion installation with rectangular plates
Notes for Pump Selection
- If the media has poor lubricity, an external bearing design is recommended. If the media has good lubricity, an internal bearing design is recommended.
- For media viscosity ≤380 mm²/s, the speed can be 1450 r/min or 2900 r/min, with 1450 r/min recommended.
- For media viscosity >380 mm²/s, 950 r/min is recommended.(Note: Higher speeds increase the High pressure screw pump inlet flow rate, which reduces reliability and lifespan. An optimal speed should be selected after careful consideration.)
- To ensure safe pump operation, a filter with a 40-80 mesh filter must be installed before the pump inlet.
- The pump's NPSHr must be less than the device's NPSHa. If NPSHr > NPSHa, reselect a pump with a larger size and a smaller helix angle and recalibrate the NPSHr.
- Matching motor power requirements After the pump model is selected, the High pressure screw pump shaft power N can be found according to the sample data, and the motor power Nm should be selected according to the table below.
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