The working principle of the spiral power seal is equivalent to a screw capacity pump, and the right spiral (or the spiral groove on both the housing, the spiral groove on both the case) is set. The purpose of the target, the friction between the liquid medium and the shell is the purpose of counterclockwise, and the division of friction F on the spiral line of the right thread to the right, so the liquid

The medium push the liquid to the right as if the nut was loosened along the screw. With the continuous reduction of the capacity, the head of the head gradually increases. In this way, the sealing pressure established with the pressure of the sealing fluid is balanced, thereby preventing the leak.

When designing the spiral sealing device, you must pay attention to the purpose of the spiral oil -catching target. If the purpose of the target is wrong, not only cannot be sealed, but on the contrary, the liquid is rushed to the purpose of the leakage, which greatly increases the leakage volume.

Obviously, spiral sealing is also a power seal. The sealing function will be removed in parking or low -speed environments. Therefore, it is often necessary to help parking sealing, which complicates the device and requires sufficient axial size.