Use knowledge of diaphragm coupling in compressor

The diaphragm coupling relies on the elastic deformation of the diaphragm to compensate for the relative displacement of the connected two shafts. It is a high-performance flexible coupling with metal strong components. It does not require lubrication, has a compact structure, long service life, and no rotation. The gap is not affected by temperature and oil pollution.There are many types of stable couplings.Such as shear pin type, steel sand type, friction type, magnetic powder type and other couplings.Since the stable coupling can automatically cut off the connection of the shaft when it is running, some stable couplings have the same function as the stable clutch.Due to various reasons, the center of mass or inertial principal axis of the coupling does not coincide with the axis of rotation, and the phenomenon of unbalanced centrifugal inertial force, centrifugal inertial couple force and dynamic deflection (vibration shape) will occur during operation, which is called the unbalance of the rotor. Phenomenon, this imbalance phenomenon will inevitably cause the vibration of the shaft system, thereby affecting the normal operation and service life of the machine, so it needs to be paid attention to.Diaphragm couplings have been commonly used in industrially developed countries around the world. my country has formulated machinery industry standards. The elastic deformation of the diaphragm compensates for the relative displacement of the two shafts connected. It is a high-performance metal elastic element. Sex coupling.

The metal diaphragm does not need to be lubricated when used, its structure is compact, light weight, long service life, no maintenance, no rotation gap, large eccentricity is allowed, not affected by temperature and oil, and easy to load and unload.Choose the diaphragm coupling that suits you, and combine your own working conditions. We choose the diaphragm coupling that suits you. Then our work will get twice the result with half the effort. The initially selected bearing coupling connection size, that is, the diameter of the shaft hole d and the length of the shaft hole L should meet the requirements of the shaft diameter of the driving and driven ends, otherwise, the specifications of the coupling should be adjusted according to the shaft diameter d.

XNUMX. Diaphragm couplings are often used in servo systems

(1) The diaphragm has good torque rigidity, but it is slightly inferior to the bellows coupling.

(2) The characteristic of diaphragm coupling is a bit like bellows coupling. In fact, the way the coupling transmits torque is similar.The diaphragm itself is very thin, so it is easy to bend when the relative displacement load is generated, so it can withstand up to 1.5 degrees of deviation, while generating a lower bearing load in the servo system.

(3) The diaphragm coupling is composed of at least one diaphragm and two shaft sleeves.The diaphragm is fastened to the sleeve with a pin and generally will not loosen or cause backlash between the diaphragm and the sleeve.Some manufacturers provide two diaphragms, and some provide three diaphragms, with one or two rigid elements in the middle, and the two sides are connected to the shaft sleeve.

(4) On the other hand, the diaphragm coupling is particularly delicate, and it is easy to be damaged if it is misused or not installed correctly during use.Therefore, it is particularly necessary to determine that the deviation is within the tolerance range of the normal operation of the coupling.

Second, the use of the diaphragm coupling in the compressor knowledge

1. Generally, compressors with medium and low power use elastic diaphragm couplings, such as elastic sleeve pin coupling, elastic pin coupling, diaphragm coupling; large symmetrical balanced medium and high pressure Compressors such as the hydrogen-nitrogen compressor in the synthetic ammonia plant have high power and low speed, and are generally directly driven by a synchronous motor. The motor shaft and the compressor crankshaft use flange couplings.

2. High-speed compressors also use gear couplings.When the fan is driven by a coupling, small and medium-sized centrifugal blowers often use elastic couplings, such as elastic sleeve pin couplings, nylon pin couplings, and diaphragm couplings.For high power, gear couplings are used.

3. Centrifugal compressors generally use gear couplings.Expansion sleeve gear coupling.The working principle of pump coupling, gear coupling refers to the transmission of torque by the meshing of inner and outer gear teeth.

4. Since the top of the external tooth of the half coupling is processed into a spherical surface, the center of the spherical surface should be located on the axis, and the meshing teeth have a large tooth side clearance, so that it has a good ability to compensate for the displacement of the two shafts in any direction .

5. If the external gear is modified into drum teeth, it is more conducive to increase the coupling's ability to compensate for the comprehensive displacement.Slowly it has replaced the old-fashioned rubber strap as the bottom of the seat. The snake spring is located on the sofa seat frame and fixed with a snake spring buckle. It has good flexibility and long life. The cushion can be adjusted at will. The snake spring is an important part of the sofa structure. It is also called S spring. The extension spring has tensile properties because of its shape resembling the letter S.