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Mechanical seal of water pump

Date: November 8, 2015 popularity: 115
Mechanical seal introduction:
Mechanical seal is a kind of shaft sealing device of rotating machinery. Such as centrifugal pumps, centrifuges, reactors and compressors and other equipment. Because the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment, and the medium in the equipment leaks outward through the gap. If the pressure in the equipment is lower than atmospheric pressure, the air will leak into the equipment. Therefore, there must be a shaft sealing device to prevent leakage. There are many kinds of shaft seals. Due to the advantages of less leakage and long service life of mechanical seals, mechanical seals are the most important shaft seals in these equipments in the world. The relative pressure compensation device of the end face (or at least the axial force of the magnetic seal) is combined with that of the rotary seal in the state standard
Main components
Moving ring and stationary ring.

1、 Installation of mechanical seal
1. Check whether the model and specification of the mechanical seal to be installed are correct.  
2. Check whether the dimensional accuracy, geometric accuracy and mutual relationship of the parts related to the installation of the main engine and mechanical seal meet the technical requirements. It mainly includes the following aspects:
(1) Radial runout tolerance of shaft (or shaft sleeve) installed in mechanical seal position, surface finish and outer diameter dimension tolerance of shaft (or shaft sleeve).  
(2) The perpendicularity tolerance of the shaft (or shaft sleeve) center line between the sealing chamber and the gland joint positioning end face.  
(3) The chamfering and finish of the end structure of the shaft (or shaft sleeve) of the movable ring seal ring and the end structure of the housing hole for installing the mechanical seal.  
(4) The axial displacement of rotating shaft of mechanical seal.  
3. During the installation of mechanical seal, it should be kept clean, and it is not allowed to knock the sealing elements with tools to prevent damage and damage.  
4. During installation, a layer of clean engine oil and turbine oil should be coated on the surfaces of the moving and stationary rings. A layer of clean engine oil or turbine oil should be applied to auxiliary sealing ring (including moving ring seal ring and static ring seal ring) before installation to ensure smooth installation.  
5. After the static ring seal ring is set on the back of the static ring, install it into the seal end cover. Pay attention not to damage the end face of the static ring, ensure that the end face of the static ring is vertical to the center line of the end cover, and pay attention to the anti rotation groove on the back of the static ring to align with the anti rotation pin, but not contact.  
6. The rotating part of the mechanical seal is fixed with the shaft by two fixed screws on the spring seat. When tightening the fixed screw, the working length of the spring should be ensured.  
2、 Use of mechanical seal
1. Before starting the main engine, it is necessary to check whether the attached device of mechanical seal and cooling and lubrication system are perfect and unblocked.  
2. Before starting, the material pipeline should be cleaned to prevent rust impurities from entering the sealing chamber.  
3. Turn the coupling by hand to check whether the shaft rotates easily. If the rotation is heavy, check whether the installation dimension is correct.

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