1 Working Principle
The three-screw pump is composed of a driving screw and two driven screws that are meshed with each other and fixed in a bushing. The screw profile is composed of a double-headed cycloid and an arc tooth shape. The screw pair and bushing are installed in the pump body. When the driving screw rotates under the driving of the prime mover, the main and driven screws form a sealed cavity under a certain length of the meshing spiral surface. The driven screw is transported by the liquid medium due to the pressure difference on both sides of the spiral surface. Push and rotate. At this time, the transported liquid enters the pump suction port and enters the sealing chamber evenly and continuously along the axial direction, and smoothly and without agitation reaches the discharge chamber from the pump suction chamber, thereby achieving the function of transporting liquid media.
2. Performance characteristics
It has strong self-priming ability and can transport liquid media with lubricity and no solid particles.
Compact structure, no need for synchronous gear transmission, high mechanical efficiency
Low noise and vibration, stable performance, long service life, easy maintenance
Specially equipped with oil storage device, which can be started again It avoids the trouble of refueling
It has a variety of connection structures, which is convenient for design and selection
For pump outlet diameters (inclusive) and below, the connection form of the inlet and outlet uses cylindrical pipe threads, and above it uses flanges join.
List of application industries of three-screw pumps
●Used as fuel injection, diesel, fuel supply and transfer pump in heating equipment, fuel system, burner system, boiler heating system, thermal power plant, etc. Vehicle pump, oil unloading pump, backfill pump.
●In the metallurgical and steel plant industry, it is used as a lubrication pump in the lubrication system, as an oil supply pump in the hydraulic system, as a combustion pump in the combustion system, and as a transport backflow pump in the oil depot.
●In mechanical machine lubrication, gear transmission lubrication, large oil film bearing oil supply circulation cooling system, we make liquid supply pumps, oil supply pumps, booster oil pumps, circulation pumps, lubricating oil pumps and remote control motor pumps, and three-screw oil pump devices.
●Hydraulic elevators are used as hydraulic pumps in hydraulic transmission devices in the lift industry, and as delivery pumps for resins, pigments, latex inks, paints, glycerin, and paraffin in the chemical industry.
●In the petroleum refinery refining industry, it is used to transport crude oil, heavy oil residue, asphalt tar emulsion, and is used in the refining process of high-temperature viscous products, such as asphalt vacuum tower bottom oil and residual fuel loading, transportation and liquid supply pumps. ●In the engine room of oil tankers, cargo ships, merchant ships and many combat ships, in port terminal crude oil pipeline services and in the collection, pressurization and loading of barges and ships, it is used to transport pressurized fuel injection and main engine lubrication pumps, main engine oil pumps and lubrication oil pumps. Three-screw pumps are also widely used in marine hydraulic pumps, marine hydraulic pumps, anchor machines, hydraulic winch drive pumps, etc.
●In shipyards/machine
manufacturers, such as separators, superchargers, engines, etc. Oil delivery systems, fuel treatment systems, lubricating oil systems It is also widely used in lubrication and hydraulic systems in propulsion systems.
●It is also widely used in industrial fields such as oil fields and offshore platforms to transport crude oil, latex liquid, etc.
●In the food industry, it is used in oil factories, wineries and food factories to transport edible oil, animal oil, and vegetable oil. , alcohol, honey, sugar juice, toothpaste, milk, cream, chocolate
●In the building materials industry, it is used as ignition oil pump and heavy oil fuel pump in the kiln of the glass factory, ceramic factory, refractory material factory, cement factory,
Important instructions on the selection and configuration of the three-screw pump unit and the precautions for use and startup: (for reference by design institutes and on-site installation and maintenance personnel)
Idling without medium is strictly prohibited. Please be sure to add lubricating medium or transport before starting the operation. medium.
It is strictly forbidden to allow any debris, welding slag, etc. to enter the pump cavity. Be sure to keep the pump cavity and the inside of the pipeline clean.
It is strictly prohibited to use pipeline filters or type filter devices. When configuring a filter, please ensure that the filtration area is times the cross-sectional area of the pump inlet diameter. And correctly configure the mesh number of the filter according to the cleanliness of the media.
It is strictly forbidden that the inlet and outlet pipes of the pump do not match the inlet and outlet pipes of the pump. The pipe diameter configuration must be consistent with the inlet and outlet diameters of the pump. To avoid cavitation or failure to self-prime. If the pipeline is too thin, it will inevitably lead to cavitation, which will cause the pump to work in an under-fed state, resulting in a drop in flow pressure of the three-screw pump unit or even abnormal vibration and noise. Long-term operation will also cause serious damage to the jammed pump and the screw pump.
The installation height of the three-screw pump must fully consider the cavitation conditions of the pump and the self-priming ability of the pump (the cavitation margin is related to the viscosity of the medium, the speed and the lead of the screw)
Due to packaging, transportation, lifting, loading and unloading, The tightening effect of pipe bolts may easily cause the original factory positioning of the pump to change or even be seriously misaligned. Therefore, after the three-screw pump unit piping configuration is installed and fixed, the coaxiality of the three-screw pump and motor must be rechecked before starting the vehicle. .
It is strictly prohibited to start the machine with back pressure or with the inlet and outlet valves closed.
It is strictly prohibited to start the rotation in a direction that does not comply with the pump rotation mark.
When two pumps are connected in parallel, one-way valves must be added at the outlet and inlet of the pump to prevent backflow of the medium from driving the three-screw pump in reverse.
It is strictly prohibited to adjust the safety valve bolts at will. The safety valve is only used to protect the safety of the pump and match the motor power with the working status of the pump. It is strictly prohibited to be used as a pressure regulating valve or a relief valve.
Four models and specifications
Three-screw pump device
Three-screw pump device
Three-screw pump device
Three-screw pump device
Three-screw pump Device
Three-screw pump device
Three-screw pump device
Three-screw pump device
Three-screw pump device
Three-screw pump device
Three-screw pump device< br />Three-screw pump device
Three-screw pump device
The series is widely used in the transmission of various media with lubricity or partial lubricity requirements and no solid particles, such as:
Lubricant liquids: hydraulic oil, mineral oil, mechanical oil, lubricating oil, quenching oil, gear oil, transformer oil, turbine oil, water glycol, crude oil, animal and vegetable oils, etc.
Low lubricity liquid: light Diesel, heavy diesel, fuel oil, fuel oil, heavy oil, residual oil, wax-containing thin oil, coolant, saponified liquid, etc.
Viscous liquids: various synthetic rubber liquids, artificial glue, emulsions, etc.
Installation of six pumps
Before installing the pump, check the coaxiality of the pump and the motor, and turn the coupling by hand to see if there is any sticking phenomenon
If a single pump needs to be assembled with the motor, the pump head should be Deburr the keys and keyways and apply engine oil, then install the pump coupling on the pump shaft
When installing the oil suction and oil discharge pipes of the pump, their diameters must not be smaller than those of the pump, and the oil suction pipes must not be smaller than the suction and oil discharge diameters of the pump. It is too long and must not have too many turns, otherwise it will affect the working performance of the pump
All pipeline gate valves, etc. should be flushed before installation, otherwise the residues during installation: such as welding slag, rigid grains, nuts, screws, etc. will be It will damage the internal parts of the pump and affect the operation and service life of the pump
The pump must be balanced on the mailbox, and the pump connecting bolt must be tightened.
After assembly, the coupling should be able to be easily rotated by hand
When two or more pumps are installed on the same main line, a check valve must be installed on the oil discharge pipe near the pump. Professional technology Engineers serve you and provide you with accurate and appropriate selection combinations to ensure that customers choose the best cost-effective products. Provide inspection reception: We welcome you to visit the company for on-site inspection anytime and anywhere, and provide you with any convenience.
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After-sales service We have established a complete after-sales service system to serve you around the clock. Provide product installation guidance to meet your various needs around the clock. All products are guaranteed for one year, and we will provide you with free service during the warranty period. We provide all kinds of accessories for our products at the lowest cost price throughout our lives.
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