AkmanSeals's blog

The use of mechanical seals in high-pressure vessels is much more difficult than in medium and low-pressure vessels, mainly due to the high pressure. It's even harder if you encounter large diameters and high temperatures under high pressure. At high temperatures, the material is prone to plastic deformation or even creep, and the fastening bolts will loosen and leak easily. Undoubtedly, when designing the overall structure of the high-pressure vessel, the first consideration should be to reduce the diameter of the sealing port as much as possible, select the material with good strength that is not easy to loosen and deform at the design temperature, and then reasonably select the appropriate sealing structure to obtain reliable sealing. mechanical seal.

1. Metal gaskets are generally used. The specific pressure of the high-pressure sealing surface greatly exceeds the sealing specific pressure of the medium and low-pressure containers. Non-metallic gasket materials cannot achieve such a large sealing specific pressure. Commonly used metal gaskets for high-pressure vessels are annealed aluminum, annealed copper, or low carbon steel with good ductility.

2. Narrow face seals are used, and sometimes even narrow face seals evolve into line contact seals.

3. Try to use medium pressure to realize the self-tightening seal, because the self-tightening seal is more reliable and compact than the forced seal.

There are many types of high-pressure seals, which are divided into two categories: forced seals and self-tightening seals according to their working principles. Forced sealing relies on the pre-tightening force of the connector (bolt) to ensure a certain contact pressure between the top cover of the pressure vessel, the sealing element, and the end of the cylinder to achieve the purpose of sealing. Self-tightening sealing means that with the increase of the working pressure in the pressure vessel, the contact pressure between the sealing element and the top cover and the end of the cylinder also increases, so as to achieve the sealing effect. The characteristic of self-tightening seals is that the higher the pressure, the greater the pressing force of the sealing element between the contact surfaces, and the better the sealing performance. When the working conditions fluctuate, the seal is still reliable, but the structure is more complicated and the manufacturing is more difficult. Self-tightening seals can also be divided into axial self-tightening seals and radial self-tightening seals according to the deformation of the sealing element.

根据密封材料的性质，高压密封件可分为引起密封件塑性变形的塑料密封件和引起密封件弹性变形的弹性密封件。

目前，压力容器常用的机械密封有平垫片密封和Kazari密封；半自紧式密封包括双锥密封；自紧密封包括楔形密封、木头密封、空心金属O型圈密封、C型圈密封、B型圈密封、三角垫片密封、八角垫片密封、平垫片自紧密封、橡胶O型圈密封等.

以上是关于高压容器机械密封的技术。如果您对机械密封感兴趣，请关注我们的网站。我们是一家专业的机械密封公司。生产的机械密封性能稳定，质量上乘。

At present, there are many types of materials used as friction pairs for mechanical seals. Commonly used non-metallic materials are graphite, polytetrafluoroethylene, phenolic plastics, ceramics, etc. Commonly used metal materials are cast iron, carbon steel, chromium steel, chromium-nickel steel, bronze, and cemented carbide. In addition, there are surface treatments such as surfacing, sintering, spraying, and composite processes to change or improve the surface properties of metal materials or friction pairs to make mechanical seal friction pair materials. All kinds of materials have certain characteristics. When choosing the material of the friction pair of the mechanical seal, the advantages and disadvantages should be avoided, and they should be used reasonably according to the specific working conditions.