A seal ring from Végegyháza, Hungary

The existing seal ring surface defect detection methods for aerospace applications have the problems of low detection efficiency, strong specificity, large fine-grained classification errors, and unstable detection results. Considering these problems, a fine-grained seal ring surface defect detection algorithm for aerospace applications is proposed. Based on analysis of the stacking process of standard convolution, heat maps of original pixels in the receptive field participating in the convolution operation are quantified and generated. According to the generated heat map, the feature extraction optimization method of convolution combinations with different dilation rates is proposed, and an efficient convolution feature extraction network containing three kinds of dilated convolutions is designed. Combined with the O-ring surface defect features, a multiscale defect detection network is designed. Before the head of multiscale classification and position regression, feature fusion tree modules are added to ensure the reuse and compression of the responsive features of different receptive fields on the same scale feature maps. Experimental results show that on the O-rings-3000 testing dataset, the mean condition accuracy of the proposed algorithm reaches 95.10% for 5 types of surface defects of aerospace O-rings. Compared with RefineDet, the mean condition accuracy of the proposed algorithm is only reduced by 1.79%, while the parameters and FLOPs are reduced by 35.29% and 64.90%, respectively. Moreover, the proposed algorithm has good adaptability to image blur and light changes caused by the cutting of imaging hardware, thus saving the cost.

Download Full-text

Seal ring

Sealing Technology ◽

10.1016/s1350-4789(10)70557-2 ◽

2010 ◽

Vol 2010 (11) ◽

pp. 15

Keyword(s):

Seal Ring

Download Full-text

Appliance for making an isotropically finished seal ring

Sealing Technology ◽

10.1016/s1350-4789(21)00110-0 ◽

2021 ◽

Vol 2021 (3) ◽

pp. 11

Keyword(s):

Seal Ring

Download Full-text

Dynamic failure analysis of static seals under pressure fluctuation in an ultrahigh-pressure water piston pump

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/09544062211052024 ◽

2021 ◽

pp. 095440622110520

Author(s):

Qian Cheng ◽

Yinshui Liu ◽

Zhenyao Wang ◽

Defa Wu ◽

Yunxiang Ma

Keyword(s):

Element Model ◽

Piston Pump ◽

Ultrahigh Pressure ◽

Maximum Pressure ◽

Seal Ring ◽

Face Seal ◽

Dynamic Failure ◽

Rubber Material ◽

The Face ◽

Sealing Ring

For ultrahigh-pressure piston pumps, in the reciprocating action of the piston, the fretting between the static face seal and the mating surface occurs with the change of the pressure in the piston chamber. This phenomenon will seriously affect the service life of the seal ring and lead to the failure of the pump. However, the failure of static seals used to seal ultrahigh-pressures is usually studied from the directions of shear, stress, or rubber material. These studies cannot explain the failure phenomenon of the sealing ring found in our experiment. This paper analyzed the failure of the face seal ring in a piston pump with a maximum pressure of 120 MPa. A two-dimensional axisymmetric finite element model was established based on the Mooney-Rivlin constitutive relation of the rubber material, and the fretting conditions of the sealing ring were analyzed. Combined with the wear scars observed by the scanning electron microscope the face seal ring’s dynamic failure mechanism on the ultrahigh-pressure piston pump was determined. A better sealing scheme was proposed and verified by the duration test of the pump, which provided a basis for the design of the sealing of the ultrahigh-pressure fluid with high-frequency fluctuations.

Download Full-text