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2022-03-22 来源: 51Due教员组 类别: Essay范文

我的分析目的是为了展示不同类型的金属波纹管的特性。有几种类型的压力调节器设计可用。在不同的设计下,我们在选择材料的时候会有不同的考虑。通过对各种金属波纹管的详细分析,我们更容易找到适合不同设计的压力调节器的金属波纹管。

 

My analysis aims to show the characteristics of different types of metal bellows. There are several types of pressure regulator designs available. Under different designs, we have different considerations when selecting materials. Through the detailed analysis of various metal bellows, it is easier for us to find the most suitable metal bellows for pressure regulators of different designs.

 

Metal bellows can be classified in two ways, one is by manufacturing method, the other is by material.

 

The manufacturing methods of metal bellows are different. According to these methods, metal bellows can be divided into seamless hydroforming bellows, seam welding bellows, edge welding bellows and electroforming bellows.

 

Seamless bellows have no potential leakage and internal stress problems, and the design is flexible because one end is closed. The outside diameter is approximately 0.25 to 3 inches. Seam welded bellows are usually up to 8 inches in diameter and can be made to any length required. However, when a very precise spring rate is required, the use of seam welded bellows is not recommended, and the design flexibility of seam welded bellows is limited because it must be opened at both ends. When given a set of life and stroke, the minimum package of edge welded bellows is the smallest. The edge welded metal bellows has the maximum stroke ratio per size, which can give full play to the maximum performance in a limited space. Electroformed bellows has great control over several important parameters, such as wall thickness, crimp shape and diameter. Therefore, the spring speed, MEA and pressure can be better controlled. The electroformed bellows has compact structure. Their package size is 0.125 inches. [1]

 

In addition to the manufacturing method, the material is also an important factor affecting the performance of metal bellows.

 

Brass can still work when operating temperatures are up to 300 ° F and its ultimate tensile strength is between 49 and 68 Ksi, so it is not a good choice because the regulator operates in an environment with greater temperature changes. Bronze can be used in high temperature applications with ultimate tensile strength between 40 and 90 Ksi. Beryllium copper is an ideal material for seamless metal bellows. High tensile strength ranges from 75 to 85 Ksi. After age hardening, the length tolerance of beryllium copper is the best. Monel is a nickel alloy. It has better corrosion resistance than brass, bronze or beryllium copper. The typical ultimate tensile strength is 80 Ksi. Bellows are made of different types of stainless steel, the two most common are 316L and 321. Stainless steel has excellent tensile strength, so it is easier to maximize travel and minimize package size. Their minimum tensile strength is 90 Ksi. In a variety of environments and media, stainless steel has good corrosion resistance. Stainless steel bellows can work at high operating temperature. Nickel is a hard material. It has excellent corrosion resistance and tensile strength ranging from 50 Ksi to 145 Ksi. [1]

 

As described in the project description, the pressure regulator operates in the temperature range of - 40F to 1300f. These valves have line sizes of 3 / 8 inches, diameters of up to 10 inches, and pressures ranging from slightly above atmospheric pressure to 600 psig. In addition, there are various designs,

 

Therefore, when we choose metal bellows, we need metal bellows that can withstand the pressure and temperature changes of different tensile strength. At the same time, when we try to use metal bellows in design, flexibility is very important. Therefore, according to the above information of different types of metal bellows, according to the specific design and cost requirements, edge welding, electroforming, bronze, Monel alloy, stainless steel and nickel can be considered.


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