The metal-toothed pad is an innovative type of threaded fastener designed to prevent loosening. It comes in two main varieties: standard and anti-loose. Manufactured from high-strength, high-precision, cold-rolled diamond-shaped stainless steel wire, it features a spring-like internal and external thread structure. The anti-loose version includes one or more locking rings, enhancing its ability to maintain tightness under stress. When embedded into metal or non-metallic materials, it forms a strong, wear-resistant, interchangeable internal thread. This fastener is ideal for use on steel and cast iron, improving the durability of screw holes, preventing thread loosening due to vibrations or fatigue, and increasing the overall strength of the threaded connection.
When selecting a seal for the impeller nut, it's essential to consider the forces it must withstand—both axial compression and rotational torque. Let’s examine some common sealing options and their pros and cons in terms of material and function.
(1) Asbestos board gaskets are known for their heat resistance and corrosion protection, offering good sealing performance. However, they are toxic and unsuitable for food-grade applications. Due to health concerns, their use is being phased out in many regions, including China.
(2) PTFE flat gaskets can handle high temperatures and corrosive environments with good sealing properties. However, they tend to slip outward when subjected to axial pressure or rotational force, leading to a loss of sealing effectiveness.
(3) Fluororubber gaskets also perform well under high temperatures and corrosion, and can withstand axial pressure. However, they are not suitable for high rotational torque, making them prone to damage over time.
(4) Corrosion-resistant metal-toothed pads offer excellent resistance to heat and corrosion, as well as the ability to handle both axial and rotational forces. They provide some locking and anti-loose functionality, though their anti-loose performance is slightly limited compared to other options.
(5) Metal-toothed pads made with graphite combine high-temperature resistance, corrosion protection, and good sealing. They can handle axial pressure but are not suitable for rotational torque, as the graphite may flake off easily.
(6) Corrosion-resistant metal-toothed pads paired with corrosion-resistant wire screw sleeves offer the best overall performance. They can endure high temperatures, resist corrosion, and manage both axial and rotational forces effectively. Their locking and anti-loose capabilities are also strong, making them a reliable choice.
The metal-toothed pad itself is highly effective in resisting heat and corrosion, providing a solid sealing effect. It also offers some auxiliary locking and anti-loose capabilities, allowing it to handle the axial and rotational forces applied during the tightening of the impeller nut. When combined with a wire screw sleeve, this system prevents the pump shaft from corroding and ensures that the impeller nut remains secure even under vibration. This design is safe, reliable, and especially effective in high-temperature environments.
After extensive field testing, it has been confirmed that combining the metal-toothed pad with the wire screw sleeve in high-temperature chemical pumps significantly improves performance. It addresses four key aspects: structural function, installation process, material selection, and safety reliability. This combination effectively solves sealing, locking, and anti-loose issues between the impeller nut, pump shaft, seal, and impeller, delivering excellent results.
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