The solution to the large vibration in the use of the serpentine spring coupling

The serpentine spring coupling is a new structure of metal.It relies on serpentine springs to transmit torque.The serpentine spring coupling is a relatively new shaft coupling transmission component in the field of global machinery today, and it is also a particularly versatile shaft coupling transmission component.The main structure of the serpentine spring coupling is composed of two half couplings, two half outer covers, two sealing rings and a serpentine spring sheet.It transfers torque by embedding the serpentine spring into the tooth grooves of the two coupling halves, and the coupling uses serpentine springs to be embedded in the tooth grooves of the two coupling halves to realize the link between the driving shaft and the driven shaft.During operation, the driven end is driven by the axial force of the active end tooth facing the snake spring to transmit torque, which largely avoids the occurrence of resonance and the elastic variable produced by the reed when transmitting torque. , So that the mechanical system can obtain a good damping effect, with an average damping rate of over XNUMX%.

The serpentine spring coupling tooth type is curvilinear: when the load is small, the straight part of the serpentine spring is basically parallel to the axis to be connected; when the load increases, the deformation of the serpentine spring increases, and the contact arc surface with the tooth is also Increase, and the distance between the contact point with the tooth becomes shorter and shorter, the stiffness increases, the relative rotation angle of the two halves of the coupling and the transmitted torque are non-linear, which belongs to the variable stiffness serpentine spring coupling.The linear tooth profile is easy to process and low in cost, but it is only suitable for working conditions with small changes in the transmission torque.Curved tooth couplings are suitable for large torque changes and positive and negative working conditions, and have a good cushioning effect, but the curved tooth shape has poor manufacturability and high manufacturing costs.

The solution to the large vibration in the use of the serpentine spring coupling

(1) Bearings and vibrations in all directions are dominated by power frequency, with obvious double frequency components.Whether there is an obvious bearing failure frequency, it indicates that the bearings are not faulty and the installation and lubrication are good.

(2) According to the field measurement data, the vibration of the non-drive end of the fan (impeller side) is less than the vibration of the drive end. The vibration of the two fans is not caused by the unbalanced mass of the serpentine spring coupling of the impeller itself or the unbalanced mass of the fan rotor after installation caused.

(3) Whether there is an obvious passing frequency of the blades, and the field test has confirmed that the fan vibration has no relationship with the opening of the baffle, indicating that the flow part of the fan is normal.

The diaphragm coupling can compensate for the axial, radial and angular deviations between the active machine and the driven machine due to manufacturing errors, installation errors, load-bearing deformations, and the effects of temperature rise changes.It consists of several sets of diaphragms, namely stainless steel thin plates, which are alternately connected with the two halves of the coupling with bolts. Each set of diaphragms is made up of several pieces. The diaphragms are divided into connecting rod type and different shape of the whole piece type.The diaphragm coupling compensates for the relative displacement of the two shafts connected by the elastic deformation of the diaphragm. It is a high-performance flexible coupling with strong metal components. It does not require lubrication, has a compact structure, has a long service life, and does not rotate. The clearance is not affected by temperature and oil pollution, and is suitable for shafting transmission in high temperature, high speed, and corrosive medium conditions.

Compensating for the misalignment of the two axes, the angular displacement can be twice as large as that of the gear coupling, the reaction force is small during radial displacement, the flexibility is large, and the corresponding axial, radial and angular displacements are allowed.It has obvious shock absorption, no noise and no wear.

It is suitable for working in high temperature and harsh environment, and can operate stably under shock and vibration conditions.

The transmission speed is high, especially suitable for medium, high speed and high power transmission.

Simple structure, light weight, small size, convenient assembly and disassembly.It can be assembled and disassembled without moving the machine (refer to the type with intermediate shaft), and no lubrication is required.

It can accurately transmit the rotation speed without slippage, and can be used for mechanical transmission.

The diaphragm coupling is a flexible coupling with a metal elastic element. It relies on the metal coupling diaphragm to connect the main and driven machines to transmit torque. It has the advantages of elastic vibration reduction, no noise, and no need for lubrication. It is today's replacement tooth Ideal product for type couplings and general couplings.We believe that the diaphragm-type elastic coupling is an ideal product to replace gear couplings and general couplings for good reasons. It is commonly used in shaft transmissions of various mechanical devices, such as water pumps, especially large Power, chemical pumps, fans, compressors, hydraulic machinery, petroleum machinery, printing machinery, textile machinery, chemical machinery, mining machinery, metallurgical machinery, aviation helicopters, naval high-speed power transmission systems, after being dynamically balanced, applied to high-speed transmission Shafting has become more common.In practical applications, the intermediate shaft type is generally used to improve the performance of two-axis offset compensation.