German we-er pump we-er model we-er price

we-er pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. It consists of two gears, a pump body, and front and rear covers, forming two enclosed spaces. When the gears rotate, the volume on the disengaging side increases from small to large, creating a vacuum that draws in the liquid. The volume on the meshing side decreases from large to small, forcing the liquid into the pipeline. The suction chamber and discharge chamber are separated by the meshing line of the two gears. The pressure at the discharge port of the gear pump depends entirely on the resistance at the pump outlet.

we-er pump working principle

The concept of a gear pump is very simple. Its most basic form consists of two gears of identical size meshing and rotating within a closely fitted housing. The interior of this housing resembles an "8" shape, with the two gears installed inside. The outer diameter of the gears and their sides fit tightly with the housing. Material from the extruder enters between the two gears at the suction inlet, filling this space. As the teeth rotate, the material moves along the housing and is finally discharged when the teeth mesh. A gear pump is also known as a positive displacement device. Like a piston in a cylinder, when one tooth enters the fluid space of another tooth, the liquid and the tooth cannot occupy the same space simultaneously because the liquid is incompressible. Thus, the liquid is mechanically squeezed out. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, providing a continuous discharge volume at the pump outlet. The discharged volume is the same for each revolution of the pump. As the drive shaft rotates uninterrupted, the pump discharges fluid without interruption. The pump flow rate is directly related to the pump speed. In practice, there is a small amount of fluid loss within the pump because this fluid is used to lubricate the bearings and the sides of the gears. Furthermore, the pump body cannot have a gap-free fit, so the fluid cannot be discharged 100% from the outlet. Therefore, a small amount of fluid loss is inevitable, preventing the pump's operating efficiency from reaching 100%. However, the pump can still operate well, achieving an efficiency of 93% to 98% for most extruded materials. This pump is not significantly affected by fluids whose viscosity or density changes during the process. If there is a damper, such as a filter screen or restrictor placed on the discharge side, the pump will push the fluid through them. If this damper changes during operation—i.e., if the filter becomes dirty or clogged, or if the back pressure of the restrictor increases—the pump will maintain a constant flow rate until the mechanical limit of the weakest component in the system is reached (a torque limiter is usually installed). There is actually a limit to the speed of a pump, which mainly depends on the process fluid. If oil is being transported, the pump can rotate at high speeds. However, when the fluid is a high-viscosity polymer melt, this limit increases significantly. It is crucial to fill the space between the two teeth on the suction inlet side with high-viscosity fluid. If this space is not completely filled, the pump cannot discharge an accurate flow rate. Therefore, the PV value (pressure × flow velocity) is another limiting factor and a process variable. Due to these limitations, gear pump manufacturers offer a range of products with different specifications and displacements (volume discharged per revolution). These pumps are matched to specific application processes to optimize system capacity and price.

we-er pump drive unit

Centrifugal pump shutdown is mainly caused by mechanical seal failure. The manifestation of failure is mostly leakage. The causes of leakage include: 1) Leakage at the sealing surfaces of the stationary and rotating rings. Main reasons include: end face flatness and roughness do not meet requirements, or the surface is scratched; particulate matter between the end faces prevents uniform operation; improper installation or incorrect method. 2) Leakage of the compensating ring seal. Main reasons include: deformation of the gland, uneven preload; incorrect installation; seal quality does not meet standards; incorrect seal selection. Practical use shows that the most common site of seal element failure is the end faces of the rotating and stationary rings. Cracking of the end faces of the rotating and stationary rings in centrifugal pump mechanical seals is a common failure phenomenon. The main reasons are: 3) Excessive gap at the sealing surface during installation, preventing the flushing fluid from removing heat generated by the friction pair in time; flushing fluid leaks through the sealing surface gap, causing overheating and damage to the end faces. 4) Vaporization and expansion of the liquid medium cause the two end faces to separate due to vaporization expansion force. When the two sealing surfaces are forced into contact, the lubricating film is destroyed, causing overheating of the end face surface. 5) Poor lubricity of the liquid medium, combined with excessive operating pressure, causes asynchronous tracking rotation of the two sealing surfaces. For example, a high-speed pump has a speed of 20445r/min, the center diameter of the sealing surface is 7cm, and after the pump operates, its linear speed reaches as high as 75 m/s. If one sealing surface lags and cannot track the rotation, instantaneous high temperature causes damage to the sealing surface. 6) Clogging of the seal flushing fluid orifice plate or filter screen causes insufficient water flow, leading to mechanical seal failure.

we-er pump industry applications

Centrifugal pumps feature a compact structure, wide flow and head ranges, and are suitable for mildly corrosive liquids. They offer various control options, uniform flow, smooth operation, and low vibration. No special vibration-damping foundation is required. Advantages include low costs for equipment installation, maintenance, and overhaul. They are widely used in industries such as electric power, metallurgy, coal, and building materials to transport slurries containing solid particles. Examples include hydraulic ash removal in thermal power plants, ore slurry transport in metallurgical concentrators, and coal slurry and heavy medium transport in coal washing plants. When a centrifugal pump operates, it must be placed on land, with the suction pipe submerged in water, and requires priming before startup. Sludge pumps and submersible centrifugal pumps are structurally limited; during operation, the motor must be positioned above the water surface while the pump is submerged. Therefore, they must be fixed; otherwise, the motor falling into the water would result in motor scrapping. Moreover, since the long shaft length is generally fixed, pump installation and use are more troublesome, and application scenarios are subject to many restrictions.

Weidou Intelligent Technology specializes in selling German we-er impeller pumps, we-er gear pumps, we-er diaphragm pumps, we-er centrifugal pumps, we-er plunger pumps, we-er vacuum pumps, we-er screw pumps, we-er submersible pumps, we-er peristaltic pumps, we-er lubrication pumps, we-er vane pumps, we-er metering pumps, we-er hand pumps, we-er drum pumps, we-er cam pumps, we-er booster pumps, we-er liquid pumps, we-er air pumps. Original German imports. Welcome inquiries and orders from users.