Coupling types, maintenance, precautions

Water pump couplings mainly include rigid couplings, toothed couplings and elastic couplings, which are described as follows: Rigid couplings are generally used on centrifugal pumps with lower power, and the connection should be removed first during maintenance. For bolts and rubber elastic rings, for liquids with low temperature, the plane gap between the two coupling halves is 2.2~4.2mm. When the temperature is high, the displacement should be 1.55~2.05 mm larger than the shaft displacement.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 during disassembly and assembly to keep them clean and not allowed to be bruised or scratched.The gear coupling has good flexibility and has automatic centering performance.

        There are hundreds of types of gear couplings, but the basic forms are two types: 1. Combination of internal and external teeth; 2. Combination of end gears.The other forms are all deformations on these two foundations.The gear clutch with internal and external gears transmits a relatively large torque. The design takes into account the different needs of users and is deliberately designed so that the lengths of the shaft ends on both sides of the teeth are not consistent, so that users can choose the installation direction according to their needs.Therefore, there is no stipulation on which end faces where.Pay attention to the installation: 1. If it is replaced on the original equipment, it should be in the same direction as the original one. If it is a newly designed and manufactured equipment, it should be in accordance with the internal and external conditions without interference with other surrounding parts. The more the tooth interface, the more reliable the installation principle.
       The maintenance is generally carried out according to the following methods: 1. Check the tooth surface meshing of the coupling. The contact area is not less than 50% along the tooth height and not less than 70% along the tooth width. The tooth surface must not have serious pitting, wear and cracks. 2. The full circle runout of the outer gear ring of the coupling is not more than 0.03mm, and the end circle runout is not more than 0.02mm. 3. If you need to remove the gear ring, you must use special tools, not knocking, so as not to bend or damage the shaft.When reinstalling, heat the ring gear to about 200°C before installing it on the shaft.The interference between the outer gear ring and the shaft is generally 0.01~0.03mm. 4. When reinstalling the intermediate tube or other parts, it should be assembled according to the original markings and data. 5. Tighten the bolts evenly with a torque wrench.

      Tire couplings are divided into two categories: convex and concave. The convex is divided into three types: integral with skeleton, integral without bone and radial incision. Tire couplings are divided into two major types: convex and concave Convex type is divided into three types: integral type with skeleton, integral type without bone and radial incision type.Their common feature is that the tire ring is bolted to connect the two halves of the coupling to realize the connection of the two shafts.The inner side of the tire ring is bonded to the steel frame by a vulcanization method, and the bolt holes on the frame are welded with nuts.When assembling, bolts are used to connect the flanges of the two coupling halves. The friction force generated between the tire and the flange end faces by tightening the bolts is used to transmit torque. The torsional shear deformation occurs when the tire ring is working, so the tire coupling It has a high elasticity, a large ability to compensate the relative displacement of the two shafts, and has good damping, and has a simple structure, does not require lubrication, and is relatively convenient for assembly and disassembly and maintenance.The disadvantage is that the load capacity is not high and the external dimension is large. With the increase of the relative torsion angle of the two shafts, the tire shape is twisted, and the axial dimension is slightly reduced, which will produce a large additional axial force on the two shafts. Increase the bearing load and reduce the life.When the tire coupling is running at high speed, the centrifugal force of the outer edge of the tire expands outward, which will further increase the additional axial force.For this reason, measures should be taken when installing the coupling to make the direction of stress in the tire opposite to the direction of stress generated during work to offset part of the additional axial force and improve the working conditions of the coupling and the two bearings. `

         Diaphragm elastic coupling: 1. Clean and check the surfaces of the two coupling halves. There should be no cracks or wear on them. The surface that matches the spacer sleeve should be smooth and free of burrs, and the coupling halves should be coaxial. The deviation should be less than 0.003mm. 2. Clean and check the spring, there should be no cracks or deformation. 3. Clean and check the bolts. There should be no cracks, wear, or deformation on the surface. 4. Alignment requirements: axial ±0.03mm, radial ±0.05mm.