Description Of The Advantages Of Modified PTFE Oil Seal
Jun 08, 2022
Pure PTFE oil seal products do not have wear resistance. To make the PTFE oil seal material seal have wear resistance, the PTFE raw material should be filled and modified. Dongsheng Sealing Technology Co., Ltd. adopts two methods. One is inorganic material. Filling modification, adding glass fiber raw materials, carbon fiber, graphite, molybdenum disulfide, etc. to PTFE, the other is filling modification, adding polyphenylene grease, polyphenylene sulfide, etc. to PTFE raw materials (suitable for water purification , food, medicine sealing industry). Through filling and modification, the wear resistance of PTFE oil seals has been improved by 2000 times, and the rigidity and thermal conductivity have been increased, so that the PTF oil seals can meet the requirements of long life.
The principle of sealing shoes
The sealing lip of the modified PTFE oil seal is drawn into a trumpet shape during processing. Since PTFE has memory shrinkage properties after being drawn, the frictional heat generated during work causes the lip to shrink continuously, so it does not need the help of a spring. The sealing lip of the PTFE oil seal will tightly hug the shaft, so that there is no gap between the sealing lip and the shaft surface, and can compensate for wear.
Product advantages
Compared with rubber oil seals, modified PTFE oil seals have the following advantages
1. The rubber oil seal is a pointed sealing lip compressed by a spring, and the width of the contact surface with the shaft is about 0.3~0.5mm. The PTFE oil seal adopts a wide sealing lip dynamic structure without spring, and the contact surface with the shaft is 5~7mm wide , so that a sufficiently lubricated oil film can be maintained, and the eccentricity of the shaft can still ensure normal sealing work under the working condition of radial runout of 0.44mm.
2. The inner wall of the modified PTFE oil seal has a thread groove opposite to the rotation direction of the shaft. When the shaft rotates, a reverse internal thrust will be generated to prevent the fluid from flowing out. This thrust is very high, so that it can seal 1.0MPa (single lip) , 3MP (lips) fluid pressure, rubber oil seal is only 0.03MPa.
3. The modified PTFE oil seal has anti-friction properties, especially suitable for working environments with no oil or less oil. Even if it is restarted after a long-term shutdown, it can still have low friction characteristics.
4. The modified PTFE oil seal ring is especially suitable for high-speed rotation applications, and the speed can reach 30m/s.
5. The modified PTFE oil seal can be leak-free.
Applications
Modified PTFE oil seals are mainly used in air compressors, generators, gearboxes, motors, pumps, air conditioners, mixers, self-energizing machinery, robots, chemical processing equipment, pharmaceutical and food processing such as food-grade equipment, etc. etc., especially suitable for applications that cannot be satisfied by traditional rubber oil seals.
