| English Name 1 |
Stator G35-1-V -Nitrile Butadiene Rubber/Silica Gel/Fluororubber For Screw Pump |
| English Name 2 |
Screw Pump Stator |
| Using |
Food Producing |
| Material |
Nitrile Butadiene Rubber/Silica Gel/Fluororubber |
| Advantage |
Acid and alkali resistance, wear-resistant |
The stator of screw pump is an important part that is easily damaged in screw pump. The accuracy of the stator tooth curve and the correct selection of material must be considered in the design and development, which directly determines the length of the stator life .
Generally, the hardness of the rubber stator should be considered: the medium containing particles should be lower, and the pure and net medium should have a higher hardness; Medium with small viscosity, hardness can be appropriately high:
The reliable basis can be obtained by selecting the formula of stator rubber for dynamic test. Because even if the hardness is close to the conventional physical properties, if the formula is different, there is still a big gap in the results of the dynamic test.
The selection of the rubber material formula must take into account what kind of medium (the composition of the medium and the corrosiveness of the medium, etc.) and the temperature of the medium, as well as the hardness of the rubber, the expansion rate of the rubber in the medium and the tearing strength. The performance of rubber after injection, not only can determine the life of the stator, and even affect the normal operation of the pump, for example: the oil medium must be selected, because many rubber is not resistant to oil media; Conveying high temperature medium should choose fluorine rubber and so on.
Hardness is a very important indicator of the performance of the stator rubber: it is expressed by quantifying the degree of resistance of the elastic surface to the quantitative load in the vertical direction. Shore (A) hardness (GB/T 531-1983) is the most commonly used in China.
High temperature concentrated sulfuric acid submerged pump
Slurry Pump Main parts:
• Impeller - front and rear shrouds have pump out vanes that reduce recirculation and seal contamination.
Hard metal and molded rubber impellers are complete interchangeable. Cast in impeller threads require no inserts or nuts. High efficiency and high head designs are also available.
• Liners - Easily replaceable liners are bolted, not glued, to the casing for positive attachment and ease of maintenance. Hard metal liners are completely interchangeable with pressure molded elastomers. Elastomer
seal rings back all liner joints.
• Throat Bush - Wear is reduced and maintenance simplified by the use of tapered mating faces to allow positive accurate alignment during assembly and simple removal.
• Bearing assembly - A large diameter shaft with short overhang minimizes deflection and contributes to long bearing life. Only four through bolts are required to hold the cartridge type housing in the frame.\
Mainly include: oil seal seal, gasket seal, thread seal, labyrinth seal, packing seal and power seal, mechanical seal.
1.
Oil seal seal
Is a self-tight lip seal, its simple structure, small size, low cost, easy maintenance, small torque resistance, both to prevent the leakage of the medium, but also to prevent the invasion of external dust and other harmful substances, and wear has a certain compensation ability, but not high pressure, so generally used in low-pressure occasions of chemical pumps.
Two, gasket seal
Gasket is the basic component of centrifugal pump static seal, which is used in a wide range. The selection of gasket is mainly determined by the chemical pump conveying medium, temperature, pressure and corrosion.
Three, thread sealing
There are generally two forms on the chemical pump, one is a threaded gasket seal, and the other is a threaded plus filler seal, both of which are used for sealing occasions with small diameter threaded connections. The sealing part of the threaded electric diaphragm pump gasket seal is a gasket, and the thread only provides the role of compression force.
Four, labyrinth seal
When the design is reasonable, the processing is excellent, the assembly is intact and the speed is high, the labyrinth sealing effect is very good. However, in practical applications, the chemical pump leakage caused by this is a lot, so it is not commonly used in chemical pump seals.
Five, packing seal
The compressibility and resilience of the packing is put into the stuffing box, and the axial compression force of the gland is converted into a radial sealing force, so as to play a sealing role.
This sealing method is called packing seal, and this packing is called sealing packing. Because the packing seal structure is simple, easy to replace, low price, adapt to the speed, pressure, medium wide and widely used in the design of chemical pump.
Six, power seal
When the chemical pump is in operation, the pressure head generated by the auxiliary impeller balances the high-pressure liquid at the outlet of the main impeller, so as to achieve sealing. When parking, the auxiliary impeller does not work, so it must be equipped with a parking sealing device to solve the leakage of the chemical pump that may occur during parking.
The seal structure of the auxiliary impeller is simple, the seal is reliable, the service life is long, and the chemical pump can be realized in the operation of the water, so it is often used in the pump containing the impurity medium of the chemical pump.
Seven, mechanical seal
The most widely used seal form in the chemical pump industry, because the mechanical seal has the advantages of less leakage and long life, so the mechanical seal is the most important shaft seal in these equipment in the world today. The mechanical seal is also called the end seal, which is defined in the relevant national standards as follows: "A device to prevent fluid leakage composed of at least a pair of end faces perpendicular to the axis of rotation in the fluid pressure and the role of the compensation mechanism elasticity (or magnetic force) and the auxiliary seal to maintain the relative sliding of the stick.
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