Method for realizing zero leakage and non-contact mechanical seal

[0019] The present invention can adopt the laser processing method to realize the design scheme of the sealing ring surface. Laser processing is flexible and easy to control, and can realize the processing of the desired shape.

[0020] Embodiment A micro-lubrication chamber (1) evenly distributed in the non-pumping groove area and a pumping groove (2) in the middle of the sealing ring are provided on the dynamic ring of the mechanical seal, see figure 1. The opening of lubricating chamber (1) and pumping groove (2) can be divided into two steps. The first step is to set microscopic lubricating chambers (1) in all areas of the sealing ring. The diameter d of these lubricating chambers (1) is 20-80um, the depth h1 is: 5-20um, and the distance L between the lubricating chambers (1) is 100~300um, such as Figure 7. The second step is to set up a pumping groove (2) in the middle area of ​​the sealing ring. The depth h2 of the pumping groove (2) is slightly greater than the depth h1 of the lubricating chamber (1), so that in the area with the pumping groove (2) , the pumping groove (2) will cover the pre-set microscopic lubricating chamber, thus realizing the staggered combination of the lubricating chamber (1) and the pumping groove (2). The pumping grooves (2) are distributed along the circumferential direction of the sealing ring, the number n of the pumping grooves (2) is 8-30, and the depth h2 is: 8-30um. Since it is set on the sealing moving ring, the inclination direction of the pumping groove (2) is opposite to the rotating direction of the moving ring, such as figure 1 shown. The sealing ring works like this: under working conditions, viscous fluid with a certain pressure enters between the end faces of the sealing dynamic ring or static ring, and due to the existence of the pumping groove (2), the fluid produces a dynamic pressure effect and an upstream pumping effect , the lubricating chamber (1) produces a dynamic pressure effect. In this way, the combination of the two is a significant reflection of the dynamic pressure effect and the upstream pumping effect. The shear flow generated by the upstream pumping effect resists the internal and external pressure difference flow, preventing the sealing medium from leaking outward; the hydrodynamic pressure effect makes the fluid film Axial bearing capacity is generated, which separates the two ends and realizes non-contact, that is, complete fluid lubrication.

[0021] This embodiment is to illustrate the present invention, and its groove shape, distribution position, and lubricating cavity distribution position are not limited, and can be all the situations mentioned in the summary of the invention.