Sichuan Nikki Seal Co.

Chengdu, China

Sichuan Nikki Seal Co.

Chengdu, China
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Duan Y.,Xihua University | Wang H.,Xihua University | Zhu W.,Xihua University | Zhang C.,Sichuan Nikki Seal Co. | Huang Z.,Sichuan Nikki Seal Co.
Proceedings - 2016 International Conference on Cybernetics, Robotics and Control, CRC 2016 | Year: 2016

The theoretical model of the wavy-tilt-dam mechanical face seal with asymmetry circumferential waviness is given. The geometric model is established, the model is presented that is a combination of asymmetry waves in the circumferential direction, a taper in the radial direction, and a sealing dam. The physical model is built. By using the finite difference method, the calculation formula of the pressure distribution in the design is derived. Then, the formula of opening force and leakage is given respectively. The results show that: 1) the waves on the seal face will obviously impair the hydrodynamic and hydrostatic effects. The calculation and analysis of the pressure distribution can be used to understand the influence of the structure of the reaction. 2) The opening force should be large enough to keep the two faces separated during the start-up period. The leakage should be less enough and a certain leakage should be designed to carry away the heat caused by the film simultaneously. © 2016 IEEE.


Wang H.,Xihua University | Zhu W.,Xihua University | Huang Z.,Sichuan Nikki Seal Co. | Zhang C.,Sichuan Nikki Seal Co. | Zhang J.,Sichuan Nikki Seal Co.
Journal of Mechanical Science and Technology | Year: 2015

For better film characteristics of the main pump seal (MPS), a theoretical calculation model was proposed based on the Reynolds equation. A case study with defined MPS was carried out, film stiffness was taken as the basic constraint condition, and the cone angle and clearance are two optimization targets. When the film stiffness reaches a maximum, the corresponding cone angle and clearance is the optimal value. The results show that: (1) film stiffness increased and decreased with clearance and cone angle, respectively; (2) the optional clearance was determined to be within a range of 2~8 µm at a cone angle of between 0.1~1.2′; (3) the maximum of film stiffness is inversely proportional to the cone angle (Clearance) approximately under the clearance (Cone angle) is fixed; (4) leakage is directly proportional to the clearance to power three, and the clearance has greater influence on the amount of leakage than the cone angle. These results provide a reliable theoretical justification for MPS-based designs including optimization method. It therefore forms a fundamental base for research and practical application. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.


Wang H.,Xihua University | Zhu W.,Xihua University | Wang Q.,Xihua University | Huang Z.,Sichuan Nikki Seal Co. | Zhang C.,Sichuan Nikki Seal Co.
2010 International Conference on Computer Design and Applications, ICCDA 2010 | Year: 2010

For more details about gas flow field of spiral grooved dry gas seals, the numerical simulation of face flow filed under different face clearances is carried out, based on the Navier Stokes equation, the laminar model and the SIMPLEC algorithm. The distribution of gas film pressure and the variety of opening force are investigated emphatically. The numerical result shows, there's clearly change of film pressure at the intersection of groove and land. At the position of gas flow out, hydrodynamic pressure is formed, at the position of gas flow into, negative pressure (relatively) zone is formed. Hydrodynamic pressure weakens rapidly as face clearance increased and changes acutely at small clearance (less than 3μm) zone. The opening force increased rapidly when the clearance is became smaller, especially when the clearance less than 3μm. At the point about 3.5μm,the opening force and closing force get the same value, and the balance clearance is gained. © 2010 IEEE.


Wang H.,Xihua University | Wang Q.,Xihua University | Zhu W.,Xihua University | Huang Z.,Sichuan Nikki Seal Co. | Zhang C.,Sichuan Nikki Seal Co.
2010 International Conference on Computer Design and Applications, ICCDA 2010 | Year: 2010

For further research on temperature field and thermal strain of dry gas seal, numerical simulation is carried out. It is discovered, the temperature of rotating ring declined gradually from inside to outside, maximum temperature (85.45T) appeared at the inner side of the face, minimum temperature (72.18T) appeared at the left outside of the ring, with a temperature difference of 13.27T.The face temperature curve is similar to a parabola; the position maximum temperature appeared is 8.7mm distant from inside, outside of the face has the minimum temperature, with a temperature difference of 3.25°C.By using the material with higher thermal conductivity and controlling the position of face groove, the thermal strain is reduced, gas dynamical reaction and film stiffness is enhanced, thereby, higher stability will be gained. © 2010 IEEE.


Wang H.,Xihua University | Dong L.,Xihua University | Huang Z.,Sichuan Nikki Seal Co. | Zhang C.,Sichuan Nikki Seal Co. | Chen C.,Southwest Petroleum University
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2011

In order to improve the performance of an aerostatic dry gas seal, the flow field numerical simulation was carried out based on the N-S equation, laminar flow model and SIMPLEC algorithm with different throttle diameters and face clearances. The gas film pressure distributes and force changes were analyzed especially. The results show that significant pressure drop formed after the gas flows through orifice, and the drop value increases with clearance increases, decreases with orifice diameter increases. The highest-pressure appears at the center of shallow groove, and is gradually declining to around. Bigger pressure gradient appears in the shallow groove near the edge area. The opening force general decreases with clearance, minimum value is close to zero. When the face clearance is in the range of 5-12 μm, the opening force increases rapidly with clearance decreasing, therefore larger gas film stiffness is formed. According to calculations, smaller orifice diameter is helpful to get larger gas film stiffness under the conditions of less face clearance. Both hydrostatic and hydrodynamic test were carried out, the diameter of the seal tested was 30 mm and the test speed is of 50-300 r/min. The leakage and wear were monitored and the results show that the sealing achieved stable non-contacting operation.

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