Disassembly and installation of pump mechanical seal
When we repair the pump, we must pay attention to the pump seal and the pump assembly. If there are problems in these steps, either the pump is not repaired or the pump can not work properly! The mechanical seal is the most effective way to rotate the mechanical body seal. First, the precision of its own processing is relatively high, especially the dynamic and static rings. If the disassembly method is inappropriate or improperly used, the mechanical seal after assembly will not achieve the purpose of sealing, and will damage the assembled sealing components.
1. Precautions for pump mechanical seal disassembly
1) When removing the mechanical seal, do not use the hand hammer and the flat shovel to avoid damage to the sealing components.
2) If there is a mechanical seal at both ends of the pump, care must be taken during the disassembly process to prevent this from happening.
3) For the mechanical seal that has been worked, if the sealing surface moves when the gland is loose, the moving and static ring parts should be replaced and should not be re-tightened for continued use. Because the original running track of the friction pair changes after loosening, the sealing of the contact surface is easily destroyed.
4) If the sealing element is bonded by dirt or condensate, the condensate should be removed before the mechanical seal is removed.
2, the pump mechanical seal installation precautions
1) Before installation, carefully check whether the number of assembled sealing parts is sufficient, whether the components are damaged, especially the dynamic and static rings, such as bumps, cracks and deformation. If there is a problem, repair or replace it with a new one.
2) Check that the chamfering of the bushing or gland is appropriate. If it does not meet the requirements, it must be trimmed.
3) Mechanical seal components and their associated assembly contact surfaces must be cleaned with acetone or absolute alcohol prior to installation. It should be kept clean during the installation process, especially the moving and static rings and auxiliary sealing components should be free of impurities and dust. Apply a layer of clean engine oil or turbine oil to the surface of the moving and stationary rings.
4) The tightening gland should be carried out after the coupling is aligned. The bolts should be evenly tightened to prevent the gland section from being skewed. Check the points with a feeler gauge or special tools with an error of no more than 0.05 mm. (Hebei Innovation Sealing Material Co., Ltd.)
5) Check the matching clearance (and concentricity) between the gland and the outer diameter of the shaft or bushing. It is necessary to ensure uniformity around the circumference. Check the tolerance of each point with a feeler gauge to be no more than 0.10 mm.
6) The amount of spring compression should be carried out according to the regulations. It is not allowed to be too large or too small. The required error is ±2.00 mm. The cross-section specific pressure is increased and the section wear is accelerated. If it is too small, it will cause insufficient sealing pressure and will not seal. After the spring is installed, it should be flexible in the spring seat. When using a single spring, pay attention to the direction of rotation of the spring. The direction of rotation of the spring should be opposite to the direction of rotation of the shaft.
7) After the moving ring is installed, it must be kept flexible. When the moving ring is pressed against the spring, it should be able to bounce back automatically.
8) Never use the tool to directly hit the sealing component during the installation process. When knocking, you must use a special tool to strike to prevent damage to the sealing component.
9) After the static ring seal is placed on the back of the static ring, it is then placed in the sealed end cap. Pay attention to protect the static ring section, ensure the perpendicularity of the static ring section and the center line of the end cover, and align the anti-rotation groove on the back of the static ring with the anti-rotation pin, but do not make them contact each Other. (Source: Sealing Technology Network)
PTFE packing range: It is made of raw material belt. It is suitable for packing and sealing of valves, kettles and pumps under corrosive medium conditions in chemical, pharmaceutical, food, petrochemical and electric power industries.
Technical Parameters:
Temperature: -200 ° C ~ 280 ° C
Line speed: 20M/S
Pressure: 2MPa 15MPa
Chemical resistance: PH value 0-13
Aramid packing range: granular fluid and its medium, steam, organic solution, acid, alkali, etc., used in the sealing of machinery, pumps, valves, pipes, containers, etc. used in fluid conveying equipment.
Features: The filler has excellent lubricity and wear resistance. The most outstanding performance is high strength, high grinding capacity, good chemical resistance, high rebound, low cold flow and easy disassembly. It is especially suitable for dynamic sealing parts containing solid particle media.
Technical Parameters:
Temperature: -100 ° C ~ +300 ° C
Pressure: 35MPa
Chemical resistance: PH value 2-13.
The main products of Hebei Innovation Sealing Material Co., Ltd. are as follows:
1: Packing series: carbon packing, PTFE packing, graphite packing, high water based packing, aramid packing, aramid PTFE mixed packing, aramid carbon mixed packing, polytetrafluoroethylene Ethylene split wire packing, PTFE packing, expanded PTFE packing, asbestos packing, carbon fiber packing, butter packing, oil-impregnated asbestos packing, asbestos rubber packing, glass fiber packing, ceramics Fiber packing, nylon packing, composite fiber packing, ceramic packing and other products. 2: Various gasket series: PTFE gasket, PTFE coated gasket, flexible graphite gasket, metal coated gasket, asbestos rubber gasket, graphite composite gasket, toothed gasket, asbestos gasket, Ladle gasket, metal spiral gasket, graphite gasket, graphite high-strength gasket, PTFE gasket gasket, rubber flange gasket, asbestos manhole gasket, asbestos hand hole gasket, autoclave special sealing ring, reaction kettle Special sealing ring, etc. 3: Rubber products: various special-shaped products such as silica gel, fluorine rubber, nitrile rubber, EPDM, and neoprene. 4: PTFE products series: PTFE rod, PTFE raw material belt, PTFE elastic belt, PTFE gasket, PTFE sheet, etc. 5: Graphite products: graphite packing, graphite rope, graphite gasket, graphite high-strength composite mat, flexible graphite packing ring and other special-shaped graphite pieces. | |
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