2results about How to "Avoid collateral damage" patented technology

This invention discloses a double-end-face self-cooling mechanical seal, relating to the field of centrifugal pumps. The device includes a cooling sleeve, a transmission fixing component, a lower static seal seat, an upper static seal seat, a lower static seal ring, an upper static seal ring, a lower static seal gland, an upper static seal gland, and two sets of clamping moving rings. The cooling sleeve is inserted into the centrifugal pump impeller shaft and is located at the end of the pump head. The transmission fixing component is located inside the cooling sleeve. The lower static seal seat is installed on the side of the cooling sleeve away from the pump head, and the upper static seal seat is installed on the side of the cooling sleeve closer to the pump head. The two sets of clamping moving rings are slidably connected to both sides of the transmission fixing component. Two sets of elastic elements are provided between the two sets of clamping moving rings and the transmission fixing component. This device uses double independent end-face seals to form a double barrier, preventing direct leakage of the medium to the environment; the integrated cooling sleeve allows the sealing components to be fully immersed and cooled, avoiding dry friction burning of the sealing surfaces; and the double-sided independent elastic pre-tightening achieves independent compensation for wear on the upper and lower sealing surfaces.

This invention discloses a medical pad that is less prone to fiber shedding and its preparation method. The medical pad is made from polytetrafluoroethylene (PTFE) short fibers through a nonwoven process and a laser perforation process. The preparation steps include using PTFE short fibers as raw materials, opening and carding them, feeding them into a web-laying machine to obtain a loosely structured PTFE fiber layer, then reinforcing it with a needle punch to obtain a PTFE felt sheet, and finally using a laser perforation process to form uniformly distributed through holes on the PTFE felt sheet, ultimately obtaining the medical pad that is less prone to fiber shedding. This medical pad is used in the field of vascular surgery as a pad during vascular suturing. It can seal needle holes and reduce the cutting force of sutures on the vessel wall. Compared with conventional short-fiber felt sheets, the fibers in the medical pad of this invention are less prone to shedding.