You may not know these knowledge of packing change set seal

Due to the existence of the airbag, the nitrogen gas is not in contact with the isolation liquid at all, which prevents the pressurized gas from being absorbed by the isolation liquid, so that the packing-to-set seal can be used in high-pressure operating conditions such as hydraulic turbines, but because the isolation liquid is in heat exchange The heat exchanger flows in the coil of the heat exchanger, so the tube resistance is large, and the requirements for the internal circulation device are very high. At the same time, the heat exchanger needs to be fully exhausted, otherwise the circulation of the isolation fluid will be greatly affected or even not circulated, and the isolation fluid The cycle effect is directly related to the service life of the seal and the reliability of the seal. The seal includes a guide rail and a bracket fixedly connected to the door. The guide rail is a flexible U-shaped guide rail, and one end of the flexible U-shaped guide rail is an involute guide structure. On the symmetrical positions of the side walls of the involute guide structure, respectively set There is a clamping claw for fixing the sealing strip of the guide groove. The bottom of the U-shaped groove at the other end of the flexible U-shaped guide rail is provided with an inward-folding edge-folding limit structure. A bracket, the connecting bracket is also provided with a bolt and nut structure connected with the door frame, and the sealing strip is an iso-shaped extrusion sealing strip.u200bu200b

The packing-to-set seal pressurizes the isolation fluid through a piston-type booster tank. The area ratio of the piston-type booster tank is generally 1 to 1.15, and the pressure of the isolation fluid is always maintained at about 1.15 times the pressure of the sealing chamber. Under normal circumstances, the inner seal only needs to bear the pressure difference of 0.15 times the pressure of the sealing chamber. At the same time, in the case of pressure fluctuations, the pressure bearing direction of the inner seal will not change. The inner flushing water is to use pressure water to flush the inner sealing surface of the pump, so as to ensure the cleanness of the sealing part and to cool the sealing. Since the inner flushing water channel is connected with the conveying medium cavity, the flushing water must have a certain pressure to ensure The medium in the pump does not leak out. The pressure of the flushing water is 0.3-0.4MPa, and the water volume is 2-5L/min. The external circulating water is a cooling device set up to ensure that the heat generated by the seal friction pair is taken away in time, so as to ensure the normal operation of the friction pair. The seal here does not require too much pressure and water. The seal is suitable for pumps with a solid content of less than 15%. The materials used are different, and it can be applied to various corrosive media or clear liquids. The seal is a built-in mechanical seal, equipped with internal flushing water and external cooling water, and two sets of cooling systems, so as to achieve the effect of protecting the normal use of the seal.