In anti-corrosion pump type, metal and non-metallic pump, and steel lining plastic pump, basic structure usually have: pump body, impeller, seal, shaft, bearing box, motor, etc. , the basic characteristics of pumps for the FSB all plastic shell structure, here are non-metallic pump structure, performance features what;
A non-metallic pump, impeller impeller can be divided into open, half open and closed type 3 kinds.
Closed impeller made of thermoplastics can cover before and after ultrasonic wave or vibration welding together.
Half open, open impeller can be made from thermoplastic or thermosetting plastic.
Impeller structure and buried metal structure in two.
Low overall nonmetallic structure impeller strength, suitable for small pump;
Buried metal structure in using moulding molding, high strength of the impeller.
The structure of the two non-metallic pump, pump body, pump body has two kinds of general and lining.
Overall pump body refers to the pump body are non-metallic, generally applies only to small centrifugal pump.
Lining pump body generally refers to the pump body material is cast iron or cast steel, for nonmetal lining layer.
Overall pump body can choose thermosetting material, thermoplastic material, lining pump can be divided into elastic lining, spraying lining and rigid lining.
Non-metallic water pump
for single-stage commonly, volute, the radial structure of subdivision.
For the pump body can join to strengthen bones and muscles, non-metallic pump in order to prevent the vulnerability of the interface stress, can be in non-metallic pump body before and after both sides to increase cover plate, and connected with the bolt reinforcement.
For the lining can be through the metal pump shell opening slots are fixed.
Also can consider on the pump shell welding tortoise shell screen.
Three, non-metallic shaft seal of pump shaft seal type mechanical seal, dynamic seal and shaft seal structure.
1, mechanical seal, the domestic many non-metallic pump usually use the type 152 (
F how spring mounted bellows mechanical seal.
The seal is used pressure range of 0 ~ 0.
5 mpa, trunnion 25 to 55 mm, temperature & lt;
120 ℃, the ring material is filled ptfe, static ring for alumina ceramic materials.
The seal can be used for more than 30% of the concentration of hydrochloric acid, 50% below the dilute sulphuric acid, more than 98% of the concentration of phosphoric acid and various mixed acid.
The seal service life is long, generally greater than 4000 h.
For most water medium and acid medium choose WB2 or 152 type mechanical seal, 169 type mechanical seal is generally selected in alkaline medium.
When working medium special should be selected according to dielectric properties of other types of mechanical seal, including material.
2, dynamic seal (including vice impeller
Or deputy leaves)
Parking seal and seal.
The seal type used in conveying medium containing solid particles, generally applicable to solid content is more than 15% of the media.
Need to allow inlet pressure dynamic seal pump, in order to avoid the user when used under high inlet pressure produces a large number of leaks.
3, shaft seal structure mainly refers to the nonmetallic magnetic drive pump, can be used to convey various do not allow the leakage of liquid.
Four, sealing ring (
Non-metallic pump is generally not a sealing ring.
Five, non-metallic pump shaft of pump shaft is generally not contact with the media, adopts metal materials, for impeller fixed at one end, and the other end for installing coupling.
Non-metallic pump shaft and the impeller of pump often USES threaded connections.
Six, non-metallic pump and pump structure difference of metal materials due to the great differences in the non-metal and metal material performance, nonmetal pump structure design has the following characteristics.
Impeller seal and back to the functioning of the pump body clearance for plastic and glass fiber reinforced plastic coefficient of linear expansion of 2 ~ 6 times larger than steel, used metal pump running clearance is prone to bite, the damage of the pump.
Clearance is too large and will reduce the efficiency of the pump, and pump axial force caused by the imbalance.
Due to the radial clearance cannot adjust, also can consider to use axial clearance, so don't need to dismantle the pump, check and adjust the clearance operation.
Impeller and shaft connection type 1)
body lining thickness and fixed by foreign pump enterprise standards, the lining thickness is commonly 3 ~ 5 mm, if the lining too thin,
Such as 1.
, pressing process easy. Local lining defects, lead to pump allows the use of a drop in temperature, and the service life, the lining layer from the water pump body and the possibility of back cover substrate metal loss also increased.
In order to prevent the temperature change caused by non-metallic fell from the water pump casing or cracking, can consider to tortoise shell on the pump shell welding wire mesh, so as to make the lining plastic pump can achieve larger specifications.
Embedded within the impeller metal parts, through the metal parts connected to the shaft with a key, or impeller and shaft directly with key links, end with impeller impeller nut protection.
This structure is derived from the metal pump, because of the sealing surface, poor reliability, after long time use, susceptible to corrosion medium.
Embedded within the impeller metal pieces, and USES threaded coupling shaft, cancel the impeller nut.
This structure can make the shaft is completely protected, avoid shaft is the possibility of corrosion medium.
Drawback is that spiral grain processing precision demand is higher, it is strictly prohibited to motor reversal during operation.
Most of the axial force balance plastic pump impeller with metal parts, should not be commonly use the balancing method of axial force.
Widely used at home and abroad back vane axial force balance.
Interface non-metallic pump force has yet to take over the relevant import and export of qualified standard, generally by the design unit, and according to the manufacturer's own manufacturing conditions.
Non-metallic pump casing as a whole, generally USES the living way of flange and pipe connection, lap joint flange on both ends of the cover plate and connectivity;
Also can adopt the way of the flange and cover board make it whole and pipeline connection.
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