German VARISCO pump VARISCO model VARISCO price

VARISCO pumps are pumps in which the vanes in the rotor slots contact the pump casing (stator ring) to press the sucked liquid from the inlet side to the outlet side. There are two types: One) specifically refers to vane pumps among positive displacement pumps. Two) refers to the three types of dynamic pumps (centrifugal pumps, mixed-flow pumps, axial-flow pumps) or other special pumps. Such pump products are generally not called vane pumps. However, in monographs, vane pumps almost entirely refer to centrifugal pumps, mixed-flow pumps, axial-flow pumps, etc. Depending on whether the theoretical displacement per revolution is a fixed value or a variable value, they can be divided into variable-displacement vane pumps and fixed-displacement vane pumps.

VARISCO pump operating principle

Its operating principle is similar to that of a single-acting vane pump; the only difference is that the stator surface consists of eight parts: two long-radius arcs, two short-radius arcs, and four transition curves, and the stator and rotor are concentric. With the rotor rotating clockwise as shown, the volume of the sealed working chamber gradually increases at the upper left and lower right corners, forming the suction zone, and gradually decreases at the lower left and upper right corners, forming the pressure zone; an oil-sealing zone separates the suction and pressure zones. For each revolution of the rotor, each sealed working chamber completes two suction and two pressure actions, hence it is called a double-acting vane pump. The two suction zones and two pressure zones of the pump are radially symmetric, and the hydraulic forces acting on the rotor are radially balanced, so it is also called a balanced vane pump. The instantaneous flow of a double-acting vane pump is pulsating; when the number of vanes is a multiple of 4, the pulsation rate is low. Therefore, the number of vanes for double-acting vane pumps is generally chosen as 12 or 16.

VARISCO pump usage precautions

Gear pumps are suitable for various industries, with a wide range of transportable media. These gear pumps have advantages such as robust structure, easy installation, easy disassembly, simple maintenance, uniform and continuous flow, slight wear, and long service life. 1) During the use of gear pumps, frequent greasing is required; since lubricating grease evaporates easily, attention must be paid to replenishment and replacement, and cleanliness at the bearings must be maintained. 2) When using or after use, place the electric oil pump in a relatively dry, non-corrosive, and clean environment. 3) During the use of gear pumps, frequent inspection and maintenance are required; pay attention to checking the electric oil drum to see if the power cord, internal wiring, plug, and switch are still functioning normally, and check whether any bearing components are damaged. 4) Preserve every component of the gear pump; during disassembly and inspection, keep every component clean and safe.

VARISCO pump maintenance

When using a gear pump, it is inevitable to encounter wear on the gear pump. Therefore, many problems will arise. Thus, it is necessary to learn the most common maintenance techniques for gear pumps. This enables accurate diagnosis when problems occur. Routine maintenance techniques are as follows: 1) Maintenance of the working surface: If the wear on the pump cover's working surface is minor, you can manually eliminate the wear marks by lapping, that is, place a small amount of valve grinding compound on a flat platform or thick glass plate, then place the pump cover on top and perform lapping, until the wear marks are removed, and the working surface is flat. If the wear depth on the working surface of the pump cover exceeds zero point one millimeter, it must be repaired by first turning and then lapping. 2) Maintenance of the drive shaft bushing bore: The repair method for wear on the drive shaft bushing bore in the pump cover is the same as that for the housing's drive shaft bushing bore. Repair of the pump housing bore: After wear occurs in the pump housing bore, the sleeve insertion method is used for repair, which involves boring out the inner cavity and fitting a cast iron or steel sleeve. After inserting the sleeve, bore the inner cavity to the required dimensions, and grind off the portion of the sleeve protruding from the end face, so that it is flush with the mating surface of the pump housing. 3) Maintenance of the valve seat: Pressure-limiting valves come in two types: ball valves and plunger valves. After the ball valve seat wears, place a steel ball on the valve seat, then gently tap the steel ball with a metal rod, until the ball valve seats tightly against the valve seat. If the valve seat is severely worn, ream to remove the wear marks, and then use the above method to achieve a tight seal. After the plunger-type valve seat wears, add a small amount of valve grinding compound for lapping, lap until a tight seal is achieved. The above describes some basic maintenance of components for gear pumps. During application, other different problems may also be encountered. These different problems must be carefully discussed to identify their causes.

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