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Double-end mechanical seal instruction manual text version
double mechanical seal
Instructions for use
Overview of 1. mechanical seals
The double-end mechanical seal is composed of two single-end seals. It has simple structure, reliable installation, and does not need to be adjusted during operation. Because the mechanical seal relies on spring force and fluid pressure to make the friction pair fit, it will automatically maintain contact during operation, and it does not need to adjust the compression force like ordinary flexible packaging after assembly. This type of leakage can be limited to a small range, as long as the surface roughness and flatness of the main sealing surface can meet the requirements, as long as the material has good wear resistance, the mechanical seal can achieve a small leakage, even invisible to the naked eye.
Pay attention to the point of mechanical seal for 2. pump:
1. Water-cooled double-end mechanical seal. Before the equipment is connected for trial operation, first, connect the cooling water to the two plastic inlet and outlet pipes between the bearing seat of the equipment and the pump casing. The water inlet mode: lower inlet and upper outlet (generally, the outlet of the cooling water pipe is about 1 meter higher than the seal, so as to ensure that the cooling water is stored in the seal cavity to prevent forgetting to seal and open the water control valve during startup). Then slightly open the water control valve, start the motor again. In daily work, the seal cooling water control valve must be opened before starting the motor, otherwise the seal will burn out and affect normal operation;
2. Oil-cooled double-end mechanical seal. Before the equipment is connected for trial operation, first add 32#~ 46# hydraulic lubricating oil to a small oil storage tank on the equipment, which should be added to about 70% of the oil tank mirror tube. Then connect the power line to determine the steering of the oil pump motor and start the oil supply. Then, start the main motor. Start the oil pump motor before starting the main motor later, otherwise the seal will burn out and affect the normal operation. In daily work, high temperature will be generated due to the high-speed friction of the sealed double-end alloy, and long-term operation will also increase the oil temperature in the circulating tank. The screw at the root of the plexiglass mirror tube sometimes loosens and causes oil leakage. If oil leakage is found, the screw of the plexiglass mirror tube must be tightened in time and lubricating oil must be added. If the oil level of the mirror tube is found to drop quickly or turbid, the seal, please replace. If the above situation is found just after a few days of use, first remove the sealing chamber and check whether there are any damage marks on the alloy surface of the department in contact with the material and whether the sealing rubber ring has dissolution and swelling. If not, the feeding pressure may be greater than the pressure of the sealing spring to cause leakage. The seal needs to be reinstalled or replaced with a new seal. The test pressure when the seal leaves the factory is ≤ 0.2MPa.
3. For single-end mechanical seal, before the equipment wiring is put into trial operation, the motor will be inched after advanced liquid materials, and then the motor will be started after there is no abnormality, otherwise the seal will burn out and affect normal operation;
Analysis of 3. Seal Damage
3.1, lack of water or lack of oil caused by the seal leakage phenomenon: the static and dynamic ring rubber ring is burnt or double end alloy is broken marks;
3.2. Sealing leakage caused by material corrosion rubber: dissolution and swelling of the contact surface between material and sealing rubber, and no damage to the general double-ended alloy;
3.3. Leakage occurs when the feeding pressure is greater than the sealing pressure: the sealing rubber on the material contact surface is detached, or there are micro-particles on the sealing rubber surface and the bottom of the sealing chamber, or the sealing alloy surface is scratched by the material on the alloy friction surface, but there is no rubber dissolution or the dynamic and static ring rubber ring is charred, which can be cleaned and re-secured (except for scratches on the sealing alloy surface) or replaced with a new seal.
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