Common chemical pump seal structure principle is introduced

Chemical water pump seal is to prevent the leakage of gas, liquid or solid particles with external, fluid into a confined space or the function of the piping system. Seal to the function of parts called the seal. More complex sealing connection is called seal structure or sealing device. Sealing device is widely used in industry, agriculture, national defense and People's Daily life. Modern chemical, oil, aerospace, atomic energy, and the rapid development of the deep sea technology of equipment of seal request higher and higher. Seal failure may be a waste of energy and material resources, environmental pollution, and even equipment scrapped and personnel casualties. Due to leakage accident has a lot of, fluid seal is a complex and difficult to solve the problem, the reliability of the seal is not only related to the seal material and seal components used, and connected structure, dielectric properties, working conditions, and many other factors. A classification method has a lot of classification, sealing seal. In accordance with the sealing can be divided into the medium of liquid sealing and gas sealing, etc. ; According to sealing pressure can be divided into high pressure sealing, low pressure sealing, vacuum sealing, etc. ; According to the relative motion between the contact surface is divided into dynamic seals and static seals. There is no relative movement between static seal is refers to the sealing surface sealing; Dynamic seal is sealed junction plane between the relative motion, such as rotating seal and cylinder piston seal, etc. Second, the theory of non-contact type dynamic seal seal structure is different, sealing mechanism vary widely, not classified in detail. For contact type seal, dynamic seal or static seal is solid contact between the seal, the sealing mechanism of the theory can be divided into three categories: the block theory, the self-styled theory and interference theory. 1, block theory of block theory is that the sealing material of sealing effect, is by the contact pressure on the surface of the sealing material for joint and to tighten the elastic restoring force force jointly formed by the blocking effect of internal media. Block theory is mainly suitable for static sealing gasket. For gasket seal, seal principles can be divided into two kinds: the plastic surface contact sealing principle and the principle of elastic line contact seal. As the plastic surface contact sealing gasket, namely by the bolt force will make the flange gasket compression, gasket produce plastic deformation, to fill the unevenness of seal face, eliminate the gap. As the elastic line contact seal, namely the gasket and the sealing surface for different curvature of the surface of the precision molding, constitute a closed circle contact line after contact, depending on the contact line Wei Xiao elastic deformation to stuffing seal online uneven, achieve the goal of eliminating gaps. 2, the self-styled theory as the sealing material is installed to the combining site, produce certain contact pressure on the surface of a joint. As the internal pressure medium, the inner pressure by superposition of sealing material on the contact pressure, better joint sealing material and the joint surface, increases the sealing effect. 3, the interference theory of sealing material is with the edge of the over surplus quantity of the structure, the axial interface is able to generate enough contact pressure, reach the purpose of sealing. The oil seal is a typical interference seal. Three, mechanism of 1, wear fluid leakage through the sealing surface of the medium leaking clearance leakage causes: a. Fluid pressure difference delta P; b。 Leakage gap h; Features: one-way leakage, from high voltage side to low voltage side; Leakage, are the main indicators of sealing device sealing performance; One-way peripheral leakage: 2, leakage ( 渗流) Under the action of pressure difference delta P, sealed fluid through the capillary leakage cause of seal materials: a. Fluid pressure difference delta P; b。 Capillary seal materials; Features: unidirectional molecular leakage; Gas leakage in weight: type, r: capillary radius or interface capillary channels.
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