One:Single Screw PumpProduct Description:
G Type Single Screw PumpIt is a single-screw conveyance pump.ItsThe main working component is the eccentric helical screw.(The rotor) and the sleeve with a double-threaded helical surface on the inner surface (referred to as the stator). Its working principle is that when the motor drives the pump shaft to rotate, the screw rotates around its own axis while also rolling along the inner surface of the sleeve, thus forming a sealed chamber of the pump. With each revolution of the screw, the liquid in the sealed chamber is pushed forward by one pitch. As the screw continues to rotate, the liquid is propelled in a spiral manner from one sealed chamber to another, eventually being extruded out of the pump body. The screw pump is a new type of mechanical liquid conveyance with simple structure, safe and stable operation, easy maintenance, continuous and uniform discharge, and stable pressure, among other advantages.
A screw pump that uses the rotation of a screw to suction and discharge liquids, suitable for thick fluids.
Parameters as follows:
Traffic:0-150m3/h;
Head pump discharge:60-120m;
Power:0.75-37kw;
RPM:500-960r/min;
Bore size:20-135MM;
Temperature:-15-200℃。
Single-screw pump is a new type of pump operating according to the reciprocating meshing volume principle, with the eccentric screw as its main working component.Rotor and fixed sleeve (stator).
Due to the unique geometric shapes of the two components, they individually form separate sealed cavities. The medium is uniformly pushed and flows axially, with low internal flow velocity, maintaining a constant volume, stable pressure, thus preventing the formation of eddies and turbulence. The output pressure of each pump stage is:0.6 MPa, head 60 m (clean water), self-priming height typically 6 m, suitable for conveying media temperatures below 80°C (special requirements up to 150°C).
Due to the use of various elastic materials for the stator, this pump boasts characteristics that general pumps cannot handle, such as the transport of high-viscosity fluids, solids with hard suspended particles, or fibrous materials. Its flow rate is proportional to the speed.
Transmission can be achieved through a coupling for direct drive, or by using a variable-speed motor, V-belt, and transmission gear unit for speed variation. This pump features few parts, a compact structure, small size, easy maintenance, and the rotor and stator being the easily damaged components. Their simple design facilitates assembly and disassembly.
Screw pump structure composition：
Screw and rotor. As the motor drives the rotor to rotate through a coupling, the screw also turns. When the screw rotates, the teeth mesh with the rotor to form a sealed chamber. After the meshing process is complete, the rotor stops rotating while the screw continues to turn, expelling the liquid from the stator's inner cavity.
Bearings and sealing devices. To ensure the long-term normal operation of the screw pump, it is essential to guarantee that the rotational motion of the motor can smoothly occur between the rotor and stator inner holes. Bearings primarily serve to support the rotor and prevent vibration during rotation; sealing devices are measures taken to prevent oil leakage or seepage between the bearings and the rotor. Currently, the sealing devices for screw pumps include mechanical seals and packing seals.
Electric motors and control units. The electric motor powers the screw pump and drives the motor to operate, while the control unit is used to monitor the motor's operating status, working parameters, and operational conditions.
Du'an Environmental ProtectionType GScrew pumps, as a commonly used industrial pump, are widely applied due to their stable operation, reliable performance, and low energy consumption.
During the operation of screw pumps, it is common to require replacement parts due to component wear or damage.
注意事项 for replacing screw pump accessoriesDescription:
Screw pumpBefore replacing parts, the machine must be cleaned.ScrewthreadPump interior. Due toScrewthreadPumps often contain various dirt and debris inside. Failure to clean them beforehand can lead to various issues during component replacement and may also reduce machine efficiency.Screw ThreadPump lifespan.
Next, it's crucial to select the appropriate accessories for replacement. Different types and models of screw pumps have varying components, so when changing accessories, you must choose the correct ones and follow the manufacturer's instructions meticulously to avoid unnecessary losses.
Additionally, safety should be a priority when replacing parts. Be cautious and careful during disassembly to prevent injury to personnel or equipment. Prior to removing the parts, always disconnect the power source and apply necessary coatings or treatments to avoid electrical hazards that could cause personal injury.
After replacement, a check is required. After replacing the components, the pump unit must be reassembled and tested. Should any abnormalities be detected, the pump must be stopped immediately to investigate the cause, in order to avoid potential safety hazards.
In summary, the process of replacing parts for screw pumps requires careful consideration of various factors and systematic operation.Comprehensive pre-replacement parts inspectionIn order to better maintainScrew threadPumps, ensuring their stable operationExtend its service lifeBy strictly controlling the process of component replacement, we can also reduce equipment failure rates, enhance work efficiency, and improve production benefits.
Duwan Environmental ProtectionG TypeSingle Screw PumpSpecsParameter Description：
Du'an Environmental ProtectionG TypeScrew pumps are rotary pumps that convey liquids or increase their pressure by utilizing the volume change and movement of the meshing space formed between the pump body and the screw. Screw pumps are categorized by the number of screws, including single-screw, twin-screw, and triple-screw pumps, among others. As the driving screw rotates, it带动 the driven screw in mesh, causing the meshing space volume at one end of the suction chamber to gradually increase and the pressure to drop. Under the force of the pressure difference, the liquid enters the meshing space. When the volume increases to form a sealed cavity, the liquid moves continuously along the axial direction within each sealed cavity until it reaches the discharge end. At this point, the meshing space volume at the discharge end of the screw gradually decreases, expelling the liquid. The working principle of the screw pump is similar to that of a gear pump, but with screws replacing the gears in structure. The table lists the characteristics and application ranges of various screw pumps. Screw pumps have minimal flow and pressure pulsations, low noise and vibration, and self-priming capabilities, although screw machining can be challenging. The pump comes in two structural types: single-suction and double-suction.But the single screw pump is only available in single suction type. The pump must be equipped with a safety valve (not required for the single screw pump), to prevent damage to the pump or the prime mover due to overpressure at the pump outlet caused by reasons such as clogging of the discharge pipe exceeding the permissible pressure.
Screw ThreadPump screwFive Causes of Wear and Tear:
1. Each type of plastic has an ideal plasticizing temperature range, and the barrel processing temperature should be controlled to approach this range. As granular plastic enters the barrel from the hopper, it first reaches the feeding section, where dry friction is inevitable. When these plastics are not heated sufficiently and melt unevenly, it is easy to cause increased wear on the inner wall of the barrel and the surface of the screw. Similarly, in the compression section and homogenization section, uneven melting of the plastic can also lead to accelerated wear.
2. The rotational speed should be properly adjusted. As some plastics are reinforced with additives like glass fiber, minerals, or other fillers, these materials often have a much higher friction against metal than molten plastic. When injecting these plastics, using a high rotational speed increases the shearing force on the plastic but also causes the reinforcement to produce more shredded fibers. These shredded fibers have sharp ends, significantly increasing the wear. The abrasive action of inorganic minerals is also considerable when they slide at high speeds across the metal surface. Therefore, the rotational speed should not be set too high.
3. As the screw rotates within the barrel, friction between the material and both components causes the working surfaces of the screw and barrel to gradually wear: the screw diameter decreases while the barrel's inner hole diameter increases. Consequently, the clearance between the screw and barrel's mating diameters gradually increases. However, since the resistance from the barrel's front head and分流板 (分流板) has not changed, this increases the leakage flow of the extruded material as it advances, meaning the flow of material through the diameter gap towards the feed direction increases. This results in a decrease in the production output of the plastic machinery. This phenomenon also increases the material's residence time within the barrel, leading to decomposition. In the case of polyethylene, the decomposition produces gases that intensify the corrosion of the screw and barrel.
4. The presence of fillers such as calcium carbonate and glass fiber in the material can accelerate the wear of the screw and barrel.
5. Due to uneven plasticization of the material or the presence of metallic impurities mixed in, the screw shaft suddenly increases its torque. This torque exceeds the strength limit of the screw shaft, causing it to break. This is a non-standard accident-related damage.
Duwan Environmental ProtectionG TypeScrew pump manufacturing, inspection, testing, and acceptance：
Duwan Environmental Protection has specialized in screw pumps.Establish a comprehensive quality inspection system to ensure that all factors affecting product safety, reliability, operational performance, and long-term operational performance have been considered, and necessary tests, inspections, and calibrations are conducted on processing, inspection, and testing equipment.
Sludge screw pump manufacturing, inspection, testing, and acceptance should be conducted in accordance with relevant standards, specifications, and regulations. The seller should note that these requirements do not substitute for the internal quality assurance measures of the manufacturing facility. The seller shall submit the required inspection, testing results, and records.UserAcknowledged.
Inspect materials used for manufacturing sludge screw pumps and issue material factory pass certificate, material inspection and test records.
In accordance with the requirements of relevant standards, specifications, and regulations, static and dynamic balancing tests are conducted on the main rotating components of the pump.
All pressure-bearing components of the screw pump, including the cooling jacket, must be statically tested in the manufacturer's workshop in accordance with regulations, with the static test pressure not less than the closed lift (zero flow).Twice and not less than 0.2 MPa.
Under the specified test pressure, no part of the pump shall exhibit deformation or signs of deformation, nor any other defects. The performance tests for the sludge screw pump and the motor shall be conducted in accordance with the specifications of the relevant standards, and the allowable deviations for each index shall comply with the relevant standards.
For the pumps supplied, the performance curves should start from the closed-point (zero flow) and extend at least to the rated flow point.130%, and should include the following: pump position number, pump model and specifications, test speed, test medium and temperature, performance curve, design operating point.
