11results about How to "Improve dynamic sealing performance" patented technology

The utility model discloses a vacuum sealing device for a vacuum high-pressure gas quenching furnace. The vacuum sealing device comprises a sealing flange seat, a flange cover, a furnace shell flange, a dynamic sealing assembly and a static sealing assembly, the furnace shell flange is arranged on the vacuum high-pressure gas quenching furnace body, and the flange cover is arranged on the furnace shell flange; a flange base extending section is formed at the bottom of the sealing flange base and penetrates through the flange cover, the sealing flange base is located above the flange cover, and the flange cover is in static sealing connection with the flange base extending section and the furnace shell flange through a static sealing assembly. The cylinder piston rod assembly is arranged on the sealing flange seat, penetrates through the sealing flange seat, the flange seat extension section, the flange cover and the furnace shell flange and then is inserted into the vacuum high-pressure gas quenching furnace body; the hot zone cabin cover is connected with the cylinder piston rod assembly; the air cylinder piston rod assembly is in dynamic sealing connection with the flange base extension section through the dynamic sealing assembly. The utility model relates to the technical field of vacuum furnaces, and can solve the problem of poor dynamic sealing effect of an O-shaped sealing ring between a cylinder piston rod and a furnace body in the prior art.

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.

The invention relates to the field of mixer trucks, and discloses a material sealing device and a mixer truck. The material sealing device is applied to the mixer truck, the mixer truck comprises a material guide barrel and a feeding hopper, and the material guide barrel is located in a mixing barrel. The material sealing device comprises a base plate, the base plate is a flexible plate capable of being bent into a circular arc shape in the plate length direction, and the base plate is used for being installed on the feeding hopper. The friction layer is arranged on the outer plate surface of the base plate and is arranged in a strip shape in the plate length direction, and oil outlet holes are formed in the friction surface of the friction layer; the elastic extrusion layer is arranged between the base plate and the friction layer in a cushioned mode, and an oil storage cavity used for supplying oil to the oil outlet holes is formed in the elastic extrusion layer. The agitating lorry comprises a material guide barrel; the feed hopper comprises a tail circular ring extending into the guide cylinder; the invention discloses a material sealing device. Wherein the base plate wraps the peripheral wall of the bottom of the tail circular ring, and the two ends, in the plate length direction, of the elastic extrusion layer are both lower than the center of the tail circular ring. According to the material sealing device and the mixer truck, the sealing performance between the feeding hopper and the material guide barrel can be improved.

The present invention relates to the technical field of biaxially stretched optical film production, specifically to a zero temperature difference spiral flow channel heat exchange roller of a longitudinal stretching machine, comprising a heat transfer cylinder body, a first end cover and a second end cover, wherein the first end cover and the second end cover are distributed at both ends of the heat transfer cylinder body, a flow guide mechanism and a spiral sheet are arranged inside the heat transfer cylinder body, the flow guide mechanism comprises a reflux pipe, a liquid inlet pipe and a partition, the outer surface of the reflux pipe is sleeved with a connecting seat, the outer surface of the connecting seat is sleeved with a ball bearing and a liquid inlet joint, the liquid inlet joint is movably connected to the connecting seat through a ball bearing, the outer surface of the liquid inlet joint is provided with an arc groove, a sealing ring is embedded in the arc groove, the outer surface of the connecting seat is sleeved with an umbrella-shaped sealing hoop, the umbrella-shaped sealing hoop is against the sealing ring, and the outer surface of the umbrella-shaped sealing hoop is sleeved with a fixed cover. The present invention has an umbrella-shaped sealing hoop, which improves dynamic sealing and keeps the roller surface temperature difference close to zero.

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 silicon core furnace isolating valve structure which is structurally characterized in that the inner diameter of a throat of a valve cavity is 650mm, the side face of the valve cavity is connected with a valve cover through a hinge assembly, a valve plate assembly is arranged in the valve cavity and comprises a rotary vane valve plate and a valve shaft which are connected with each other, the valve shaft is installed on the valve cavity, and the upper end of the valve shaft is connected with a valve plate driving assembly installed on the top of the valve cavity. And valve shaft sealing assemblies are respectively arranged at the upper and lower joints of the valve shaft and the valve cavity. The valve cover has the advantages that 1) the valve cover of the valve cavity of the large-size isolating valve can effectively meet the drawing requirement of a silicon core furnace; (2) the loading strength can be ensured, the phenomena of slag falling, abnormal sound and the like during opening of an original metal gasket are avoided, and the crystal pulling quality and the personnel maintenance convenience are ensured; the vacuum airtightness of the whole isolating valve cavity can be guaranteed, the dynamic sealing performance is good, a sealing ring is resistant to fatigue, the service life is long, the integrated junction box design facilitates installation and maintenance and gas-electric pipeline layout and routing, the production cost can be saved, a water inlet hose can be protected through the isolating valve plate assembly, and safety accidents and production losses are avoided.

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.

The invention discloses a distributed cross beam restraint system. The distributed cross beam restraint system comprises a cross beam, a middle drive locking device, a rack, a rotary drive rod and two end restraint devices. The rotary driving rod is rotationally connected with the rack, and the cross beam is supported by the rack and can move on the rack in the vehicle width horizontal direction; the end restraint devices are located in the areas nearby the two ends of the cross beam respectively. Each end restraint device comprises a cam mechanism and a lock hook and lock catch restraint pair. The cam mechanism comprises a cam and a driven piece, the cam is fixed to the end of the rotary driving rod, and the driven piece is rotationally connected to the rack; the lock hook and lock catch constraint pair comprises a lock hook and a lock catch, the lock hook is fixed on the driven piece, and the lock catch is fixed on the cross beam; when the rotary driving rod and the cam rotate together, the driven piece and the lock hook swing together to be matched with plug-pull movement of the cross beam, so that the lock hook is coupled with the lock catch, and the two ends of the cross beam are restrained. The space, weight and cost expenditure are reduced, and the dynamic sealing performance of the upper portion of the door system is improved.

The utility model discloses an axial compensation formula miniature gear pump, it includes, pump shell, sealing assembly and anti -backflow subassembly, the inside of pump shell is equipped with first gear and second gear, and first gear and second gear interlock, the one side fixedly connected with sealing element of sealing cover, the inside fixedly connected with spring of first annular groove, the one side of anti -backflow spare is provided with low pressure groove, the other side of anti -backflow spare is provided with high pressure groove, through above -mentioned structure, through the pre -tightening elastic force effect of spring in sealing assembly, continuously push sealing element axial compression anti -backflow subassembly, can compensate the axial gap of gear pair because of long -term wear, promote the dynamic sealing performance between high low pressure chamber, avoid the oil leakage caused by the gap increase, prolong the service life of gear pump, and anti -backflow subassembly adopts high low pressure groove differentiation volume structure, effectively suppresses high pressure oil liquid through gear end face gap to the oil inlet reverse backflow.