Analysis of the leakage of mechanical seal in centrifugal pump

Centrifugal pump mechanical seal leakage analysis of centrifugal pump mechanical seal leakage analysis, and a variety of leaks and may cause leakage of the site is described at the same time, the general common centrifugal pump mechanical seal in the maintenance problems that may arise briefly Description. 1 Introduction to the principle of structure Mechanical seal is a rotary contact with the dynamic seal, which is the fluid medium and the elastic element under the action of two perpendicular to the axis of the sealing surface close to the relative rotation, so as to achieve a sealed Claim. Universal centrifugal pump mechanical seal a wide range of different models, but their leakage are basically reflected in the six: ① dynamic and static end of the ring; ② static and static ring box seal secondary seal; ③ moving ring and shaft Sets of auxiliary seal; ④ seal ring between the stationary box and seal body; ⑤ seal between the sleeve and the pump shaft; ⑥ moving ring inlaid with the structure of the Department. Failure of the mechanical seal performance (1) seal the end of the fault: wear, thermal cracking, deformation, damage (especially non-metallic seal face). (2) spring failure: relaxation, fracture and corrosion. (3) Auxiliary seal failure: Assembling failure has broken pieces, rips, bumps, curling and twisting; non-assembled faults are deformed, hardened, ruptured and deteriorated. Mechanical seal failure in the operation of the performance of the central vibration, heat, wear and tear, and eventually to the media in the form of external leakage. 3 mechanical seal leak analysis and treatment General mechanical seal pump after installation have to go through static and dynamic tests to confirm the mechanical seal installed correctly, when found to facilitate the timely maintenance. In addition, during normal operation may also be a sudden leak, then you can conduct a comprehensive analysis based on the situation to confirm the cause of the mechanical seal leakage of the real reason, easy to solve. The following static pressure test leaks, periodic or paroxysmal and recurrent leakage of three cases were described. 3.1 Static pressure test leak a, seal the end face of the installation bumps, deformation, damage; b, the seal between the end of the installation of granular impurities caught in the installation; c, seal the end face of the screw loose or not tightened, gland Static and static ring assembly is not pressed or compressed enough or damaged; f, static and dynamic ring "V" -shaped seal Anti-counterfeit; g, sleeve leakage, the sleeve seal assembly is not compressed or the amount of compression is not enough or damaged. Handling: Strengthen the assembly inspection, cleaning; in strict accordance with the technical requirements for assembly. 3.2 periodic or paroxysmal leakage a, rotor assembly axial movement too much. Treatment: Adjust the thrust bearing so that the shaft axial movement of not more than 0125mm. b, the rotor components periodically vibrate. Remedy: Find the cause and eliminate it. c, the pressure in the sealed chamber often changes drastically. Treatment: stable process operating conditions. 3.3 Frequent Leakage 3.3.1 The amount of spring compression (mechanical seal compression) is too small due to recurrent leakage due to imperfections on the sealing face. b, the amount of spring compression is too large, graphite ring cracked. c, seal the width of the end face is too small. Treatment: Increase the width of the seal face, and a corresponding increase in spring force. a, compensation seal ring floating too bad (seal ring is too hard or hardening or compression is too large, compensation ring gap is too small). Treatment: To compensate for the seal ring gap is too small, increasing the compensation ring gap. b, diamond or bonded dynamic and static ring joint leakage (poor mounting process, there is residual deformation; uneven material; binder deformation). c, moving, static ring damage or crack. d, seal face wear, the ability to compensate disappears. e, dynamic and static ring seal face deformation (end face by the spring force is too large, massage heat is too large, resulting in thermal deformation; seal parts structure is irrational, strength is not enough, force and deformation; due to processing and other reasons, the seal parts Residual deformation; uneven installation caused deformation). Remedy: Replace defective or damaged seal ring. f, moving, static ring Seal end face and shaft centerline deviation is too large, moving, static sealing ring relative parallelism difference is too large. Remedy: Adjust the seal face. 3.3.2 Auxiliary ring caused by recurrent leakage a, ring material is not right, wear, corrosion, temperature, anti-aging performance is too poor, resulting in premature deformation, hardening, rupture, melting and so on. b, "O" ring seal the amount of compression is not, too large, easy to install bad, too small, the sealing effect is not good. c, Install the ring shaft (or sleeve), seal the end cap and seal chamber, the surface of the "O" ring advancing burrs chamfer angle is not smooth or rounded enough. Treatment: Burr and smooth chamfer, should be properly trimmed smooth, appropriate to increase the arc and chamfer, trim smooth. d, "O" -shaped rings have broken, cracked, bruised, curled and twisted. Handling: pay attention to the assembly matters.

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