The working principle of vertical screw pump is as follows:
Vertical screw pump belongs to the volumetric pump, and its working principle mainly relies on the mutual meshing between the screws Inside the pump, there is usually one active screw and one or two slave screws. The main screw is driven by a motor through a transmission device such as a coupling and begins to rotate. The helical surfaces of the master and follower screws fit tightly together, forming a series of closed sealing chambers between them. When the master screw rotates, these sealing chambers make continuous, uniform linear movement along the screw’s axial direction.
At the suction end, with the rotation of the screw, the volume of the sealing chamber gradually increases, thus generating negative pressure. Under the action of external atmospheric pressure and the liquid’s own pressure, the liquid is smoothly sucked into the sealing chamber. Subsequently, the sealing chamber containing the liquid moves axially towards the discharge end. During this process, the volume of the sealing cavity gradually decreases, the liquid is squeezed, and the internal pressure gradually increases. When the sealing chamber reaches the discharge end, the pressure rises sufficiently to overcome the resistance of the discharge pipe, and the liquid is forcibly discharged.
It is worth noting that the sealing performance is very good due to the high machining precision of the screw and the tight meshing between the helical surfaces. This effectively prevents the phenomenon of backflow of liquid in the conveying process, ensuring that the liquid can be sucked in and discharged stably, continuously and evenly.
The following is a comprehensive analysis of the advantages and disadvantages of vertical screw pumps:
Advantages
1. Excellent delivery stability
– Vertical screw pumps can provide uniform, continuous and pulsation-free flow output, which is critical for processes that require precise control of fluid delivery and pressure. The flow rate remains relatively constant under both high and low load operating conditions, ensuring the stability and consistency of the production process.
– Due to its smooth conveying characteristics, it can effectively reduce the impact and wear on the piping system and related equipment, and extend the service life of the entire conveying system.
2. Wide range of media adaptability
– Can handle a variety of different nature of the media, including high viscosity, solid particles, corrosive and lubricating difference of the fluid. Whether it is viscous oils, pasty substances, slurries containing fibres or fine particles, or even corrosive liquids such as strong acids and alkalis, vertical screw pumps are capable of transporting tasks.
– This wide range of media adaptability makes it in many industrial areas can find a place, without the need to replace different types of pumps for different nature of the media, reducing the cost of equipment procurement and maintenance.
3. Good self-priming performance
– Usually has a strong self-priming ability, can be in the case of no additional filling or priming, suction liquid and establish a stable transport process. This feature is very practical in some of the more demanding start-up conditions or difficult to pre-fill the liquid occasions.
– The existence of self-priming performance not only simplifies the operation steps, but also improves the flexibility of the equipment and emergency response capability, so that it can be put into working condition faster.
Disadvantages
1. Higher initial investment cost
– Due to its complex structural design, high-precision manufacturing requirements and the selection of high-quality materials, the acquisition cost of vertical screw pumps is relatively high. Compared with some simple structure pumps, more money needs to be invested in the purchase.
– Especially in application scenarios with high requirements for pump performance and reliability, it may be necessary to select models with higher configuration and better materials, further increasing the initial investment.
2. Maintenance and repair complexity
– The complexity of the internal structure requires specialised technicians in case of failure or maintenance. The disassembly and assembly process is cumbersome and requires a high level of skill and experience on the part of the maintenance personnel.
– Maintenance may require the replacement of specific parts, which are also relatively expensive to obtain and replace, increasing the overall cost of equipment maintenance and downtime.
3. Sensitivity to operating conditions
– Sensitivity to operating conditions such as cleanliness and temperature of the conveying medium. If the medium contains large solid particles or impurities, it will easily lead to wear and tear of the screw and pump cavity, affecting the performance and life of the pump.
– At the same time, too high or too low a temperature may also cause damage to the pump sealing materials and components, additional cooling or heating measures need to be taken to ensure its normal operation.
Vertical screw pumps have a wide range of applications in many fields due to their unique performance characteristics, including the following:
1. Petrochemical industry
– Can be used to transport all kinds of crude oil and refined oil, such as petrol, diesel, paraffin, etc.
– Able to accurately transport a variety of complex chemical raw materials, such as polymer solutions, high viscosity organic compounds.
– In asphalt production, smoothly transport high temperature and high viscosity asphalt.
– For residual oil, which is a medium with high impurity content and high viscosity, it can also achieve stable transport.
2. Food industry
– Widely used in chocolate, syrup and other high-viscosity and strict hygiene requirements of food material transport.
– Precise transmission of cream, jam and other food materials with different viscosity and composition.
– It can guarantee the quality and hygiene safety of milk, fruit juice and other liquid food in the conveying process.
3. Paper industry
– Effective transport of pulp to ensure a stable supply of raw materials in the paper production process.
– Precise control of the conveying volume and pressure of the coating to improve the coating quality of paper.
4. Sewage treatment
– Reliably conveying sludge containing large amounts of solid particles and impurities in municipal sewage treatment plants.
– Help the efficient discharge and treatment of sewage, and guarantee the normal operation of sewage treatment system.
5. Pharmaceutical industry
– Accurately conveying all kinds of pharmaceutical liquids, including those with corrosive or high viscosity.
– Ensure the stable conveying of special dosage forms such as creams, suppositories, etc., and guarantee the quality and efficiency of drug production.
6. Construction industry
– Efficiently conveying cement slurry to provide stable material supply for building construction.
– Accurately control the conveying of mortar to meet the requirements of different construction parts and processes.
7. Marine industry
– On the ship, it is responsible for the safe and stable delivery of fuel to ensure the normal operation of the ship’s power system.
– Effectively complete the discharge and adjustment of ballast water to maintain the balance and stability of the ship.
8. chemical fibre industry
– Accurately conveying chemical fibre raw materials, such as polyester chips, melts, etc., to meet the process requirements of chemical fibre production.
– Ensure the stability and consistency of material conveying during the production of chemical fibre products.
9. Energy industry
– For example, smooth conveying of solid waste such as fly ash in thermal power plants.
– For energy production of various types of media transport to provide reliable support.
Vertical Screw Pumps: The Right Hand for Industrial Fluid Conveying
In the modern industrial field, efficient and stable fluid transfer is a crucial part of the production process. Vertical screw pumps, as a common and high-performance fluid transfer equipment, is playing an indispensable role.Vertical screw pump, as the name suggests, has a vertical structure and is mainly composed of pump body, screw, drive shaft, sealing device and other components.
Its working principle is unique and subtle. The active screw in the pump rotates under power drive and engages with the driven screw. Between the spiral surfaces of the screw, a series of continuous closed chambers are formed. As the lead screw rotates, these chambers move axially from the suction end to the discharge end. At the suction end, the chamber volume gradually increases, forming a negative pressure, the liquid is sucked in; and at the discharge end, the chamber volume decreases, the liquid is squeezed, the pressure rises, and finally is discharged from the pump.
Vertical screw pump has many significant advantages. First of all, it can transport a variety of different properties of the fluid, whether it is high viscosity oil, polymer solution, or slurry containing solid particles, and even corrosive chemical liquids, can cope with it. Secondly, the flow rate is stable and uniform, which can effectively avoid the influence of flow rate fluctuation on the production process. Furthermore, it has a strong self-priming ability, no need to fill the pump when starting, easy to operate. In addition, the operation noise is relatively low, reducing the noise pollution in the working environment.However, the vertical screw pump is not perfect. Its cost is relatively high, which is mainly due to its complex structure and high-precision machining requirements. At the same time, repair and maintenance also require professional technology and equipment, which is costly. Moreover, it is more sensitive to impurities in the conveying medium, and larger particles may lead to pump wear and failure.
In practical applications, vertical screw pumps are widely involved in a number of industries. In the petrochemical field, it is used to transport all kinds of oil, chemical raw materials; food industry, can transport chocolate, syrup and other food materials; paper industry, bear the task of transporting pulp and paint; sewage treatment plant, help sludge and sewage treatment; pharmaceutical industry, the precise delivery of medicine and preparation.
In short, vertical screw pumps occupy an important position in the field of industrial fluid transfer with its unique working principle and performance characteristics. With the continuous progress of technology, it is believed that it will continue to be optimised and improved to provide more powerful support for industrial production.
English 
Russian 
Spanish 
Portuguese 
Arabic