Summary of screw pump: screw pump is a single screw transport pump. Its main working parts are the screw of the eccentric screw body (called rotor) and the screw bushing (double stator spiral surface) with inner surface. Its working principle is that when the motor drives the pump shaft to rotate, the screw rotates on its own axis on the one hand, on the other hand it rolls along the inner surface of the bushing, so that the sealing chamber of the pump is formed. When the screw rotates for a week, the liquid in the sealing cavity advances a pitch. With the continuous rotation of the screw, the liquid spiral way is pushed from one seal chamber to another, and finally, the pump body is extruded. The screw pump is a new type of liquid conveying machinery. It has the advantages of simple structure, safe and reliable operation, convenient maintenance, continuous liquid discharge and stable pressure. The working principle of the screw pump is that when the screw pump is working, the liquid is sucked into the sealed space surrounded by the screw and the pump shell. When the active screw rotates, the sealing capacity of the screw pump is increased under the extrusion of the screw teeth, and the screw pump pressure is increased, and it moves along the axis. As the screw is rotated at the same speed, the flow rate of the liquid is also uniform.
Advantages of screw pump: because of its characteristics of variable transport, strong self suction, reversion, and transportation of liquid containing solid particles, it is widely used in wastewater treatment plants for conveying water, wet sludge and flocculant liquid. The selection of screw pump should follow the principle of economic and reasonable. If there is no consideration in design and selection, it will bring trouble to future use, management and maintenance. Therefore, selecting a screw pump that meets the actual needs of production can ensure the smooth production and reduce the cost of repair.
First, the quality of screw pump:
Nowadays, there are many kinds of screw pumps on the market. Relatively speaking, the imported screw pumps are reasonable in design and excellent in quality, but the price is higher. Some services are not in place. The price of the parts is high and the ordering period is long, which may affect the normal operation of the production.
Most of the domestic products are imitation imported products. The quality of products is different. When selecting the domestic products, when considering their performance price ratio, they choose products with low speed, long lead and high transmission volume and long life. A series of screw pump products produced in Shanghai for a long time are the best choice for you.
Two, the rotating speed of the screw pump is selected.
Screw pump flow and speed linearly relative to the screw pump, low speed and high speed screw pump could increase the flow and head, but significantly increased power, high speed accelerated between the rotor and the stator wear, premature failure will make screw pump, and high speed screw pump rotor length is very short, easy to wear, and thus shorten the life of the screw pump.
It can reduce the rotational speed through the deceleration mechanism or the stepless speed regulation mechanism, and keep its rotation speed within a reasonable range of three hundred rpm. Compared with the high-speed running screw pump, its service life can be prolonged several times.
Three, to ensure that the sundries do not enter the pump body:
Wet sludge mixed with the solid debris will rubber material damage to the stator of the screw pump, so to ensure that debris does not enter the pump chamber is very important, many wastewater treatment plant before the installation of a grinder pump, and some install grid device or filter, blocking debris into the pump, the grid should be cleared in time to avoid clogging fishing.
Four. Avoid disconnection:
The screw pump must not be allowed to operate in cutting conditions, the occurrence of rubber stator due to dry friction, instant high heat and burn out, so the grinder intact, is one of the necessary conditions of grille unimpeded, normal operation of the screw pump for some screw pump pump body still installed end feeding stop device, when cutting, due to its characteristics of screw pump self-priming function, will produce a vacuum chamber, a vacuum device causes the screw pump to stop running.
Five, maintain constant export pressure:
A screw pump is a kind of volumetric rotary pump. When the outlet is blocked, the pressure will increase gradually so that it exceeds the predetermined pressure value. At this time the motor load increased dramatically. The load of the related parts of the transmission machinery will also exceed the design value. When it is serious, the motor is burned and the transmission part is broken. In order to avoid the damage of the screw pump, the bypass overflow valve is usually installed at the outlet of the screw pump to stabilize the outlet pressure and maintain the normal operation of the pump.
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