Analysis on the Design of the Performance of Metal Toothed Pads

The metal toothed pad is a new type of threaded anti-loose fastener. It is divided into two types: ordinary type and anti-loose type. It is made of high-strength, high-precision, smooth-cut cold-rolled diamond-shaped stainless steel wire. A spring-like internal and external thread concentric body. The anti-loose locking type threaded screw sleeve is added with one or several turns of the locking ring on the basis of the ordinary type. Embedding it into a metal or non-metallic material creates a high-strength, wear-resistant, interchangeable standard internal thread. It can be used on steel and cast iron to improve the durability of the screw hole, prevent loosening of the thread due to various vibrations, fatigue fracture and increase the fatigue strength of the threaded connection.

The impeller nut seal should be able to withstand the axial compression force of the impeller nut and the rotational torque applied to the impeller nut during the sealing and auxiliary locking process. First analyze the following common impellers from the perspective of the installation process. The advantages and disadvantages of the nut seal in terms of material selection and function.

(1) Asbestos board mat can withstand high temperature and medium corrosion, and the sealing effect is good, but it can not be used for food tools. Because it is toxic, it has been suggested in China that asbestos board mats gradually withdraw from the sealing industry.

(2) The PTFE flat pad can withstand higher temperature and medium corrosion, and the sealing effect is also good, but when subjected to the axial pressing force and the rotating torque, it is easy to slip outward, and the sealing effect is invalid.

(3) Fluororubber gasket can withstand high temperature and medium corrosion, and can also bear axial compression force, but can not withstand the role of rotating torque, easy to damage.

(4) Corrosion-resistant metal toothed pad can withstand high temperature and medium corrosion, can also bear the role of axial pressing force and rotating torque, and has the auxiliary locking ability, but the anti-loose ability is slightly poor.

(5) Metal toothed pad graphite can withstand high temperature and medium corrosion, good sealing effect, and can also bear axial pressing force; but can not withstand the rotating torque, graphite is easy to fall off.

(6) Corrosion-resistant metal toothed pad and corrosion-resistant wire screw sleeve can withstand high temperature and medium corrosion, good sealing effect, can withstand axial pressing force and rotating torque, and the locking and anti-loose ability are also good. .

The metal toothed pad can withstand high temperature and medium corrosion, has a sealing effect, and has a good sealing effect. It also has certain auxiliary locking and anti-loose ability, and can withstand the axial pressing force applied to the toothed pad during the tightening of the impeller nut. And rotating torque. The combination of the metal toothed pad and the wire screw sleeve makes the pump shaft not corroded by corrosive media, and the impeller nut does not pose a danger due to loose vibration. This structure is safe and reliable for high temperature.

After a long-term field test verification, it was confirmed that the metal toothed pad and the wire screw sleeve were combined in the high-temperature chemical pump impeller nut, and the high-temperature chemical pump was reasonably solved from the four aspects of structural function, installation process, material selection and safety reliability. The sealing, locking and anti-loose problems between the impeller nut, the pump shaft, the impeller nut seal and the impeller are four components, and the effect is very good.

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