Purpose unified standard seal design standards, to facilitate the development of the seal structure design.
two. Scope of application Applicable to all units of Zhongyu Building Materials Group.
three. Seal Overview
Sealing in mechanical equipment is to prevent leakage. Parts that are sealed are called seals. There are two main reasons for the leakage: First, due to the results of mechanical processing, mechanical products on the surface there must be a variety of defects and shape and size deviation. As a result, gaps are inevitably generated at the mechanical part connection. Second, the pressure on both sides of the seal is poor, the working medium will leak through the gap. Eliminating or reducing any element can prevent or reduce leakage. In general, the reduction or elimination of the main way to prevent leakage. Seal is to seal the gap between the joints, isolate or cut off the leakage channel, increase the resistance in the leakage channel or in the channel by adding a small work components, the leakage of material pressure, and the leakage caused by partial pressure offset Or fully balanced to prevent leakage. Therefore, the sealing performance is an important indicator of product quality assessment, it is a direct impact on product performance and service life. four. Sealed classification 1. Sealed classification
Seal can be divided into relatively static joint between the static seal and the relative movement of the joint between the two types of dynamic seal. Static seal mainly pad seal, sealant seal and direct contact seal three categories. The dynamic seal can be divided into two basic types: rotary seal and reciprocating seal. Contact the seal with the relative movement of the parts are contact, can be divided into contact seals and non-contact seal. Almost all of the static seal are contact-type seal, dynamic seal both contact type, there are non-contact type. In general, the contact seal is good, but by friction and wear restrictions, apply to the sealing surface speed is low occasions. Non-contact seals are less tightly adapted for higher speed applications.
Zhongyu Building Materials Group Development Department standard documents
2. The type and material of sealing a) The basic requirements of the seal is good sealing, safe and reliable, long life, and should strive to compact structure, the system is simple, easy manufacturing and maintenance, low cost, to ensure interchangeability, to achieve standardization, The Second, the sealing material should meet the sealing function requirements. Due to the different media being sealed, and the working conditions of the equipment are different, the sealing material is required to have different applicability. The requirements of the sealing material are generally: 1) material density is good, not easy to leak media 2) have the appropriate mechanical strength and hardness.