dan foydalanishmexanik muhrlaryuqori bosimli idishlarda, asosan, yuqori bosim tufayli, o'rta va past bosimli idishlarga qaraganda ancha qiyin. Yuqori bosim ostida katta diametrli va yuqori haroratga duch kelsa, bu qiyinroq bo'ladi. Yuqori haroratda material plastik deformatsiyaga moyil bo'lib, hatto siqib chiqadigan bo'lsa, mahkamlash murvatini bo'shatadi va uning oqishi oson. Shubhasiz, yuqori bosimli idishning umumiy konstruksiyasini loyihalashda, avvalo, muhrlash portining diametrini imkon qadar kamaytirishni hisobga olishimiz kerak, dizayn haroratida bo'shashishi va deformatsiyasi qiyin bo'lgan materiallarni tanlashimiz kerak. mustahkamligi va keyin ishonchli muhrlanishni olish uchun tegishli muhr tuzilishini oqilona tanlang. muhr.
Yuqori bosimli idishlarni mexanik muhrlash texnologiyasi, muhrlash printsipi va muhr tuzilishidan umumiy tamoyillar quyidagilardan iborat:
1.Metal gaskets are generally used, and the specific pressure on the high-pressure sealing surface greatly exceeds the sealing specific pressure of medium and low pressure containers, and 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 mild steel with good ductility.
2. Tor yuzli muhrlar ishlatiladi va ba'zan hatto tor yuzli muhrlar ham chiziqli aloqa muhrlariga aylanadi.
3. O'z-o'zidan mahkamlanadigan muhrlarga-mukofot qilish uchun imkon qadar o'rtacha bosimdan foydalaning, chunki o'z-o'zidan mahkamlanadigan muhrlar majburiy muhrlanishga qaraganda- ishonchli va ixchamroqdir.
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 as the operating pressure in the pressure vessel increases, the contact pressure between the sealing element, the top cover, and the end of the cylinder also increases, thereby realizing the sealing effect. The characteristics of self-tightening seals are that the higher the pressure, the greater the pressing force of the sealing elements between the contact surfaces, and the better the sealing performance. When the operating conditions fluctuate, the sealing 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.
According to the properties of the sealing material, high-pressure seals can be divided into plastic seals that cause plastic deformation of the sealing element and elastic seals that cause elastic deformation of the sealing element.
At present, the commonly used mechanical seals for pressure vessels include flat gasket seals and Kazari seals; semi-self-tightening seals include double cone seals; self-tightening seals include wedge seals, Wood seals, hollow metal O-ring seals, C-ring seals, B Ring seal, triangular pad seal, octagonal pad seal, flat pad self-tightening seal and rubber O-ring seal, etc.
In the appendix of the national standard for steel pressure vessels in my country, several commonly used mechanical seals structures are recommended based on experience and structural characteristics, which can be reasonably selected in combination with operating conditions during design.
