7results about How to "Solve stress concentration" patented technology

The present invention relates to a high-temperature metal sealing ring for a small gas turbine, comprising: a sealing ring, a sealing mating surface and a stress relief groove; the sealing mating surface comprises a mating surface 1 and a mating surface 2, and the stress relief groove is arranged on the inner side of the sealing ring. The beneficial effects of the present invention are: a stress relief groove is provided to absorb the high-temperature expansion, and when the temperature changes from low temperature to high temperature, the expansion direction will point to the direction of reducing the stress relief groove, which effectively solves the stress concentration caused by high-temperature expansion and improves the service life of the metal sealing ring under high temperature conditions; the width of the stress relief groove is set to the ring expansion of the sealing ring at the working temperature of the sealing ring, and the stress relief groove is just closed during normal operation, which effectively improves the sealing effect under high temperature environment; there are sealing mating surfaces on both sides with a surface roughness not greater than Ra0.8, and the free spacing is 1.005 to 1.01 times the width of the sealing groove, so as to ensure plane sealing during use, and use the pressure difference to achieve sealing, thereby improving the sealing effect.

The application relates to a fan technical field, and provides a fan impeller structure, the impeller structure comprises a central shaft and a blade, further comprises a base plate coaxially arranged with the central shaft, the blade is fixedly connected with the base plate, and the outer end of the blade is bent into a bending part located on the inner side of the base plate; the impeller structure of the application embodiment fixes the blade through the base plate, and the bending part is located on the inner side of the base plate to improve the stability; compared with the prior art, the vibration of the outer end of the blade can be reduced, the stress concentration effect of the blade root can be reduced, and the service life of the blade can be prolonged.

The invention provides a semiconductor device and a preparation method thereof, a power module, a power conversion circuit and a vehicle, and relates to the technical field of semiconductors, and the semiconductor device comprises a semiconductor body, a gate structure, a filling layer, a source electrode and a drain electrode. The first surface of the semiconductor body is provided with a source trench extending into the semiconductor body, the semiconductor body further comprises an insulating layer located on the inner wall of the source trench, and the insulating layer further comprises at least one part extending out of the source trench from the inner wall of the source trench. The gate structure extends from the first surface into the semiconductor body. The filling layer comprises a first part and a second part which are connected, the first part is arranged in the source trench, and the second part is positioned on one side, far away from the second surface, of the first surface, extends towards at least one side in a first direction parallel to the first surface and covers the insulating layer. The technical scheme provided by the invention aims to improve the reliability of the semiconductor device.

The local stress dispersion structure of the battery box body comprises the battery box body and the hanging lug arranged on the battery box body, the stress dispersion assembly is arranged between the battery box body and the hanging lug, and the stress dispersion assembly can effectively solve the problem of stress concentration generated by welding of the hanging lug and the battery box body. The welding fusion penetration risk is reduced, the vibration resistance of the box body is improved, and the influence of welding spot failure of the battery box body on the air tightness and safety of the battery pack in later use is reduced; the local stress dispersion structure of the battery box body provided by the utility model can effectively solve the problem of stress concentration generated by the welding of the hanging lugs and the battery box body, is beneficial to reducing the welding penetration risk, and improves the vibration resistance of the box body; and the influence of the welding spot failure of the battery box body on the air tightness and safety of the battery pack in later use is reduced.

The curved-swept blade design method comprises the following steps that a blade in the area above the gravity center of a blade tenon rotates around the axis of an engine, the blade in the area from the gravity center of the tenon to 30% of the blade height position rotates around the axis of the engine to the blade back direction, and the blade in the area above the gravity center of the tenon to the blade back direction; and an included angle is formed between the element-level gravity center of the runner hub and the connecting line of the axis of the engine and the gravity center of the blade tenon. The invention further provides a swept-curved blade. According to the method and the swept-curved blade, smooth transition between the root end area and the middle upper part of the blade can be achieved, the problem of stress concentration is avoided, and smooth transition from the end area in the blade runner to the tenon is achieved.

The invention discloses a short-distance coal seam 110 construction method roadway forming method, and belongs to the technical field of coal mining, the short-distance coal seam comprises an upper coal seam and a lower coal seam, and the specific steps are as follows: calculating a roof cutting height: firstly calculating a theoretical value of the roof cutting height, and then calculating an actual value of the roof cutting height based on the theoretical value of the roof cutting height; the roadway roof is reinforced according to the actual value of the roof cutting height; performing top-cutting dense drilling according to the actual value of the top-cutting height; supporting in a roadway of a roadway-forming dynamic pressure area; and according to the actual value of the roof cutting height, supporting in the roadway of the roadway forming stable area. By the adoption of the method, through coal-pillar-free mining, remaining coal pillars of a close-distance coal seam can be omitted, coal pillar resources originally wasted in mining can be removed, the problem of stress concentration of the coal pillars is solved, the damage situation of interlayer rock masses is greatly improved, and the adverse mine pressure influence on mining of a lower coal seam is greatly reduced.

The application discloses a large-diameter gas film dome spherical warehouse dome arrangement structure, which comprises a dome body, a double-ring beam is arranged on the upper portion of the dome body, the warehouse upper building is connected through the double-ring beam, the distribution of force flow is changed, the portion where the lower portion of the double-ring beam and the top warehouse wall of the dome body intersect is a ring beam reinforcing area, and a plurality of ring reinforcing ribs are arranged along the height direction of the ring beam reinforcing area. The application changes the distribution of force flow through the arrangement of the double-ring beam, so that the force is uniformly transmitted to the dome, the ring beam reinforcing area ensures the smooth transmission of stress, and the stress concentration of the local dome is improved, thereby solving the problem of stress concentration in the existing connecting structure for the upper portion of the spherical warehouse dome and the warehouse upper building.