The small pump couplings mainly include rigid couplings, toothed couplings and flexible couplings, which are described as follows:
First, rigid coupling
Rigid couplings are generally used on centrifugal pumps with low power. Firstly, the connecting bolts and rubber elastic rings are removed during maintenance. For liquids with low temperature, the plane clearance of the two coupling halves is 2.2~4.2mm. When high, it should be 1.55~2.05 mm larger than the axis. The rubber elastic ring of the coupling should be 0.15~0.35 mm smaller than the diameter of the perforation. At the same time, special tools must be used when disassembling and disassembling, keeping it clean and not scratching.
Second, the toothed coupling
The toothed coupling is flexible and has automatic centering performance. The inspection is generally carried out as follows:
1. Check the meshing condition of the coupling tooth surface. The contact area is not less than 50% along the tooth height, not less than 70% along the tooth width. The tooth surface must not have serious pitting, wear and crack.
2. The full-circle jump of the outer ring gear of the coupling is not more than 0.03mm, and the circular runout of the end face is not more than 0.02mm.
3. If you need to remove the ring gear, you must use special tools, not to knock, so as not to bend or damage the shaft. When reloading, the ring gear should be heated to about 200 ° C and then loaded onto the shaft.
The interference between the outer ring gear and the shaft is generally 0.01~0.03mm.
4. When assembling the indirect tube or other parts, it should be assembled according to the original mark and data.
5. Tighten the bolt evenly with a torque wrench.
Third, diaphragm type elastic coupling
1. Clean and inspect the surface of the two coupling halves. There should be no cracks or abrasion on the surface. The surface matching the middle spacer should be smooth and burr-free. The coaxiality deviation of the coupling halves should be less than 0.003mm.
2. Clean and inspect the spring piece, no cracks or deformation.
3. Clean and inspect the bolts. The surface should be free from cracks, abrasion and deformation.
4. Correction requirements: axial ± 0.03mm, radial ± 0.05mm.