Fluorine-butterfly centrifugal chemical pump parts maintenance requirements

Fluorine-butterfly centrifugal chemical pump after long time use, fluorine-butterfly centrifugal chemical pump vulnerable parts will be a certain wear and tear. Mainly including machine sealing, bearing, impeller, etc. , and then with the increase of operation time will damage the equipment. We are in the process of using fluorine-butterfly centrifugal chemical pump, it is important to note that maintain fluorine-butterfly centrifugal pump, but can reduce the maintenance cost, then we should be how to overhaul fluorine-butterfly centrifugal chemical pump parts?

1 fluorine-butterfly centrifugal chemical pump coupling equipment chemical pump coupling are rigid coupling and coupling of tooth profile. ( 1) Rigid coupling rigid coupling general use on the smaller power of centrifugal pump, the connecting bolt at the first remove the maintenance and rubber elastic ring, the liquid temperature is not high, the two coupling plane clearance of 2. 2 ~ 4. 2 mm, at high temperature, should be greater than the former volume 1. 55 ~ 2. 05 mm。 Coupling rubber elastic ring is smaller than perforation diameter should be 0. 15 ~ 0. 35 mm。 When disassembling must use special tools at the same time, keep clean, there is no scratch bruised. ( 2) Coupling tooth coupling has good flexible, automatically to the performance. General maintenance according to the following methods: (1) check the coupling tooth surface meshing, the contact area along the tooth height not less than 50%, along the tooth width is not less than 70%, tooth surface must not have severe pitting corrosion, abrasion and crack; (2) stainless steel pump coupling outer ring gear radial runout is not greater than zero. 3 mm, face round beating is not greater than zero. 02 mm; (3) if need to remove the gear ring, have to use special tool, do not knock, lest make the shaft bending or damage. When the back pack, gear ring should be heated to 200 ℃ or so and then loaded on the shaft. Outside of the ring gear and shaft are generally to 0. 01 ~ 0. 03 mm; (4) in the back pack indirect tube or other parts, should be in accordance with the original tags and data assembly; (5) with torque move hand tighten the bolt equably.

2 fluorine-butterfly centrifugal chemical pump dynamic seal part of the overhaul fluorine-butterfly dynamic seal of centrifugal pump is refers to the sealing of the impeller mouth ring, general radius direction should be controlled in 0. 20 ~ 0. 45 mm。 If the gap is too small, barring difficult after assembly; Clearance is too large, easy to cause the vibration of the pump. Shaft sleeve and lining ring gap radius direction is commonly 0. 2 to 0. 6 mm。

3 fluorine-butterfly centrifugal chemical pump static sealing part of the overhaul chemical pump static seal parts including pump body split joint surface, the combination of bearing gland and bearing housing, lubricating oil system of joint, such as import and export of tube flange, such as maintenance does not guarantee no leakage, also make the water pump can not run. Sealing of the above, as long as the types according to choose the suitable adhesives and gaskets, which can ensure no leakage. Now generally use subdivision surface adhesive for nantah 703, its 704.

4 fluorine-butterfly centrifugal chemical pump impeller and the rotor maintenance fluorine-butterfly centrifugal chemical pump is more commonly used for single stage or single stage double suction impeller rotor. First check the impeller maintenance and clean appearance, whether replacement of spare parts, install the new impeller or cleaning the old impeller, returned it after all to do static balance, when necessary to do dynamic balance. The matching of the impeller and shaft using H/H, when installing impeller key and the key to the correct contact. For the rotor part of trunnion allows bending is not greater than zero. 013 mm, maximum bending for low speed shaft should be less than 0. 7 mm, maximum bending of high-speed shaft should be less than 0. 04 mm。 Shaft sleeve parts with shaft assembly with H/H. For part of the rotor shaft, rear axle repair radial runout is not greater than 0. 013 mm, shaft sleeve is not greater than zero. 02 mm, impeller mouth ring is not greater than zero. 4 mm, impeller face runout is not greater than zero. 23 mm。 On both ends of the diameter of axle is not greater than zero. 02 mm。 But for more complex centrifugal pump structure, the data standard varies according to the state of the pump.

5 fluorine-butterfly centrifugal chemical pump mechanical seal maintenance overhaul of chemical process pump seal, should use a special tool right off the plane down the dynamic and static ring, and check the abrasion of end face, all installed seal of pump rotor, regardless of size, power should be dynamic or static balance test. In order to ensure the seal does not leak, can be on the bench platform of dynamic and static compaction, pour water do leakage test, if static water will not leak, shows that the surface roughness of the sealing surface and plane degree conform to requirements. When installation end verticality deviation is not greater than zero. 015 mm。 After installing the shaft axial momentum is not greater than zero. 45 mm。 Should emphasize mechanical seal is installed, according to the requirement must be turning, and check the cooling water section is reliable, prevent leakage or damage to the machine seal face after rotation. Chemical plant most of the mechanical seal of pump used for single, double, tandem seal is decorated, but no matter what kind of seal leakage can be decorate all phenomena. ( 1) Single-stage pump seal arrangement of single-stage seal when installation, must guarantee that parallel to the dynamic and static ring, shaft sleeve, shaft neck should have burr and scratch.

( 2) Machine double seal arrangement double pump seal arrangement.

two-stage decorate seal installation must ensure the locating ring size and clearance, and a push to the position, the o-ring cannot emerge grooves, or damage to the machine seal sealing surface.

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