5results about How to "Improve dynamic sealing performance" patented technology

A brush seal device for suppressing buoyancy disturbance effects includes a Rayleigh stepped groove structure on the axial inner surface of a front baffle. The number of Rayleigh stepped groove structures is evenly distributed along the circumference. This invention innovatively designs the Rayleigh stepped groove structure on the inner surface of the front baffle. When a high-pressure flow enters the Rayleigh stepped groove structure, it creates a velocity gradient in the airflow, generating viscous shear stress. Furthermore, the airflow velocity increases at the converging portion of the Rayleigh stepped groove structure, further forming local dynamic pressure. Through this dynamic pressure effect, a stable air film can be formed between the front row of brush filaments and the front baffle. By limiting the deformation of the front row of brush filaments, brush filament buoyancy is suppressed, thereby achieving the purpose of suppressing the brush filament buoyancy disturbance effect and ultimately improving the dynamic sealing performance and service life of the brush seal.

This utility model relates to the field of respiratory therapy equipment technology, and discloses a mask pad, a nasal mask, and an oronasal mask. The mask pad includes a connecting portion, a pressure support portion, a contact support portion, and a facial contact portion arranged sequentially along the wearing direction. The connecting portion, pressure support portion, contact support portion, and facial contact portion constitute a single-layer pad. The contact support portion and the facial contact portion form a curved structure extending inward and bending towards the connecting portion. The pad is a single-layer membrane pad, which can optimize the support structure to relieve facial pressure, avoid the edge-cutting effect, and improve airflow guidance while ensuring a tight seal, thereby improving wearing comfort. This solves the technical problem of existing mask pads having a contradiction between sealing and comfort, and poor adaptability.

This utility model discloses a multifunctional metal mobile phone cover, relating to the field of mobile phone cover technology. It includes a metal casing body, and its innovation lies in: an inwardly extending U-shaped dustproof protrusion integrally formed at the edge of the SIM card slot opening, covering the left and right sides and top edge of the opening; the inner wall of the dustproof protrusion has a sloping structure, with its end connected to a U-shaped sealing groove and fitted with an elastic sealing strip. When the SIM card tray is inserted, the sloping structure guides the tray to precise positioning and compresses the sealing strip, causing axial compression and radial expansion deformation, tightly filling the gap between the tray and the casing; simultaneously, the U-shaped sealing groove firmly fixes the sealing strip, forming a dynamic sealing interface. This design overcomes the technological limitations of precision molding of metal casings, effectively blocking the path of dust intrusion from the tray's mating gap through the integrated protrusion, sloping guidance, and sealing groove compression mechanism, thus solving the long-term sealing defects of metal covers in the SIM card slot area.

The utility model relates to a kind of elastic expansion joint structure for building construction, it is related to building construction field, including support structure, fixed structure and drainage structure, support structure includes support plate, support plate is equipped with mounting hole, mounting hole inside inserts elastic pin, mounting hole both sides are equipped with sliding slot, sliding slot is equipped with elastic strip, and elastic strip is installed with V-shaped spring;Fixed structure includes cover plate, cover plate center is equipped with limit hole, and bolt is installed in limit hole, and the end of bolt is fixed in the fixed hole on elastic pin;Drainage structure includes drainage groove, drainage groove is U-shaped, and drainage pipe is installed in the bottom of drainage groove.Compared with prior art, the utility model has the advantages that it realizes multi-stage energy absorption from macro displacement to micro deformation, significantly improves dynamic sealing, ensures that the structure moves synchronously with expansion joint, avoids damage caused by stress concentration, effectively delays material aging, reduces maintenance frequency, modular assembly design reduces on-site processing requirements, and is suitable for rapid deployment in different span scenarios.

The utility model relates to the technical field of sealing, and discloses an adjustable labyrinth seal for feeding of a grinding head, which comprises a feeding hopper, a feeding hopper cylinder section and a dust collecting hopper are respectively mounted on the right side of the feeding hopper, a labyrinth seal is arranged on the right side of the feeding hopper cylinder section, and a fine adjustment device is mounted on the right side of the labyrinth seal. The right side of the dust collecting hopper is connected with a graphite dipping flexible sealing ring, and the right side of the fine adjustment device is provided with a feeding spiral. According to the adjustable labyrinth seal for feeding of the grinding head, axial movement and radial deviation generated by operation of equipment are compensated in real time through the self-lubricating characteristic and the elastic modulus self-adaption characteristic of graphite materials, a dynamic sealing interface driven by pressure difference is constructed, and the dynamic sealing efficiency is improved through a multi-stage coupling sealing system.