3results about How to "Prevent sucking" patented technology

This invention discloses an inflatable protective vacuum packaging bag and its manufacturing process, belonging to the field of packaging bag technology. The packaging bag includes an outer bag body and an inner bag body. The outer bag body is formed by sealing an inner and outer film on all four sides, creating a sealed inflatable buffer cavity between the inner and outer films. The outer bag body is shaped like a "U" with an open top. The inner bag body is made of a single layer of heat-sealable plastic film, with the same shape as the outer bag body but smaller in size. The inner bag body is fitted inside the outer bag body, and the inner and outer bags are heat-sealed only at the edge of the top opening, forming a gap space between the outer surface of the inner bag body and the inner surface of the outer bag body. The outer bag body has ventilation holes penetrating the inner and outer films. The inner and outer films are heat-fused together at the hole walls, keeping the inflatable buffer cavity sealed at the perforation. The outer bag body also has a pressure-limiting and venting structure communicating with the inflatable buffer cavity. This structure closes when the air pressure inside the inflatable buffer cavity is below a preset threshold and opens to vent when it exceeds the preset threshold.

This utility model provides a bottom ash suction device for a coal-fired chain grate boiler, including an ash pot. A bag filter is installed above the ash pot, and the top of the bag filter is connected to the inlet of a Roots blower via a pipeline. A discharge device is installed below the ash pot, and an ash hopper is installed below the discharge device. One side of the ash pot is connected to one end of a ash suction pipe, and the other end of the ash suction pipe is connected to a suction nozzle. An air mixing port is opened on the side of the suction nozzle, and an air mixing inlet pipe is provided on the air mixing port. This utility model has a strong blower suction power, which can easily suck up larger ash lumps. It consumes less energy and has low operating costs. The bag filter can thoroughly filter dust in the air, ensuring environmental hygiene. The ash suction pipe uses a transparent steel wire hose, which can prevent it from being squeezed out by negative pressure and allows the flow of ash inside the pipe to be seen. The air mixing port on the side of the suction nozzle ensures that some air is mixed in while sucking up ash, ensuring that the airflow carries the ash smoothly into the ash pot and preventing ash blockage in the ash suction pipe.

The application discloses a kind of dangerous chemical storage tank manhole quick opening explosion-proof safety device, it is related to dangerous chemical storage tank technical field, including tank body, the top of the tank body is fixedly connected with manhole pipeline, the explosion-proof safety device further includes: safety protection component, the safety protection component is used to block fire and extinguish when spark mixes in pipeline, safety protection component includes: sealing door, heat insulating plate and explosion-proof fire-retardant core, the sealing door is placed in the top of manhole pipeline, heat insulating plate is fixedly installed in the bottom of sealing door, the manhole remote automation is opened and closed by automatic opening and closing mechanism, eliminate the explosion hidden danger that spark is generated when manually disassembling bolt, pressure sensor cooperates with pressure relief valve and air pipe real-time monitoring adjusts tank pressure, prevent high pressure spouts or vacuum suction, explosion-proof fire-retardant core and heat insulating plate block pipeline in spark spread, filter component dustproof, ceiling protects electrical components, improve the safety of manhole operation.