Friction bearing technology for melt metering pumps explained

Flange is a common part structure in the connection of pipeline and equipment, because of its convenient operation and reliable performance, it is widely used in many industries. In the high temperature melt chemical and extrusion industries, the connection of each equipment and transfer pipeline is also mainly completed through the flange. According to the different shape structure, sealing surface form and connection welding port style, flange has a variety of classifications, but the main structure is basically: two corresponding flange, flange sealing gasket, and through the distribution of the surrounding bolts for locking.

Melt gear pumps are mostly used in high temperature and high pressure conditions, usually the transport medium also has a certain corrosive, continuous chemical and extrusion production process pays great attention to the reliability of the equipment, in order to better meet the needs of the working conditions, melt gear pumps commonly used flange sealing forms are: stop seal, metal ring seal, winding gasket seal, tooth combination gasket seal.

First, stop seal

Stop seal is a kind of cancel gasket sealing style, the structure is: one end of the flange open countersunk hole concave platform, the other end of the flange open and countersunk hole concave platform corresponds to the ring cam, in use through the top surface of the cam and the concave platform bottom surface of the locking sticking to complete the seal. This kind of sealing is mainly used in high viscosity extrusion industry, in order to take into account the role of sealing and relative positioning of the two sides of the flange, eliminating the need to replace the flange gasket every time the disassembly of the trouble. When installing the sealing surface can be properly coated with sealant to enhance the sealing, special attention should be paid to the installation stage to protect the sealing surface from damage.

Second, metal ring seal

Metal ring seal and stop seal is similar, in the structure, the stop sealing sealing cam and flange separation, flange recess into the relatively softer texture, height above the depth of the concave copper or stainless steel metal ring, usually also in the metal ring on both sides of the sealing surface to open up a number of sealing water line to enhance the sealing effect. Metal ring can be reused many times to improve the texture of the stop seal cam and damage is not easy to repair the shortcomings.

Third, winding gasket seal

Winding gasket is by the "V" or "W" shaped metal belt and non-metallic material wound into a circular sealing ring, is a semi-metallic gasket in the elasticity of the gasket, suitable for uneven load, easy to relax the joint force, temperature and pressure cyclical changes, impact or vibration occasions, but also according to the material of the gasket, the gasket can be used for the sealing of the gasket. Vibration of the occasion, but also according to the corrosive properties of the material selection of different metal materials to meet the demand.

Four, tooth-shaped combination gasket sealing

Toothed gasket is a kind of metal soft gasket, the sealing effect is better than the metal flat gasket, generally with precision lathe in the metal stainless steel flat gasket two sides processed into a concentric 90-degree angle waveform serrated grooves, according to different media, you can choose the flexible graphite, PTFE, non-asbestos sheet or some other soft metal pasted on the two sides of the gasket, making full use of the sealing of the soft cover layer as well as the strength of the metal, elasticity and good, also has a labyrinth sealing effect. Both labyrinth sealing effect, in contrast, to achieve the same sealing effect gasket compression force is small.

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