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Design and characteristics of metal bellows

Time: 04-15 󰃯 Reading times: 534 󰃳 Editor in charge: The sea 󰃗 Column: product focus

Introduction: The design of metal bellows is multi parameter design, and the design difficulty coefficient is relatively large. The parameters are: the thickness of the corrugated pipe, the number of layers, the number of layers, the effective thickness of the corrugated pipe. The performance parameters of metal bellows are: bit

The design of metal bellows is multi parameter design, and the design difficulty coefficient is relatively large. The geometric parameters of metal bellows are: inner diameter, outer diameter, wall thickness, number of layers, wave distance, wave thickness, ripple number, effective length and famous structure. The performance parameters of metal bellows are: displacement, pressure resistance, stiffness, life, etc.
      According to the design input conditions, the preliminary design of geometric parameters and materials is carried out, and then the performance parameters are designed and evaluated by using the design formula such as EJMA. If the design does not meet the requirements, some parameters need to be redesigned again until the design requirements are considered. In most cases, in order to carry out a practical design, it needs to be in multiple divergent design provisions An effective plan for promotion. The orientation of lifting design is to ensure that the stiffness is as small as possible under the conditions of pressure, displacement and temperature. Using new material and new structure to improve the pressure resistance and working displacement of bellows.
Features of metal bellows:
1. Excellent performance
The multi-layer structure of metal bellows can reduce the stiffness and increase the effective displacement, which is beneficial to reduce the valve length.
2. Design specification
According to the requirements of valve design manual, such as small stem diameter, small opening stroke and the welding form of bellows under pressure, the structure of metal bellows is reasonable and compact, which is conducive to the miniaturization of valve design structure.
3. Strong practicability
Customers can choose the products according to their needs and simple calculation, which are suitable for all kinds of globe valves, gate valves, regulating valves, etc. The design and calculation of metal bellows are based on the theory of plate and shell, mechanics of materials and calculation mathematics. There are many parameters in the design of bellows, because of the different uses of bellows in the system, the design and calculation are also different. For example, bellows are used as force balancing elements, and the effective area of bellows is fixed or little changed within the working range, and the elastic characteristics of bellows are specified to be linear; the vacuum switch pipe is used as vacuum sealing element to specify the vacuum sealing performance, radial displacement and fatigue life of bellows; when valves are used as sealing parts, the bellows shall have certain requirements It can resist pressure, corrosion, temperature, working displacement and fatigue life. According to the structural characteristics of bellows, bellows can be made up of ring shell, flat cone shell or ring plate. Design and calculation of bellows is to design and calculate circular shell, flat conical shell or ring plate.
The design parameters, the effective stress, the effective stress, and the service life of the bellows.