Thread seals for chemical pumps
The thread seal of chemical pump is a sealing method commonly used in small diameter thread connection sealing occasions. It mainly has two forms: thread connection gasket seal and thread plus filler seal. The following is a detailed explanation of these two forms:
1. Thread connection gasket seal
Principle: In this sealing method, the seal is a gasket, and the thread mainly provides the role of clamping force. By tightening the thread, the gasket is compressed and fits tightly on the sealing surface, thereby achieving a sealing effect.
Influencing factors: The sealing effect depends not only on the performance of the gasket itself, but also on the roughness of the sealing surface and the relative geometric position accuracy with the threaded hole.
Applicability: Since the gasket may be subjected to a large clamping force and torque during the tightening process, non-metallic gaskets are generally only suitable for chemical pumps with low pressure. Metal gaskets are suitable for occasions with pressures of more than 30MPa due to their higher strength and stability.
2. Thread plus filler seal
Principle: Similar to thread connection gasket seal, but on this basis, the use of fillers is added. Fillers can fill the thread gap to further enhance the sealing effect.
Application: This method is often used in situations where high sealing performance is required, especially when the required sealing effect cannot be achieved by gaskets alone.
3. Other considerations
Design and processing: Reasonable design, sophisticated processing and perfect assembly are the key to ensuring the sealing effect of threads. When designing, it is necessary to fully consider factors such as the geometric parameters of the thread, the material and performance of the gasket, and the treatment of the sealing surface.
Maintenance and inspection: Regular inspection and maintenance of thread seals, and timely replacement of aging or damaged gaskets can effectively prevent leakage and other problems.
4. Challenges in practical applications
Leakage problem: Although thread seals can achieve better sealing effects in theory, in practical applications, leakage problems may still occur due to various factors (such as material aging, improper installation, etc.).
Cost and benefit: The cost of thread seals is relatively low, but in some situations where sealing performance is extremely high, other more complex sealing methods may be required to ensure the sealing effect.
