Bell mouth

About: Bell mouth is a research topic. Over the lifetime, 603 publications have been published within this topic receiving 1624 citations.

Necking plastic inspection well

Abstract: The utility model relates to a necking plastic inspection well, and belongs to the field of municipal engineering. The necking plastic inspection well comprises a well base, a straight-wall well I, a necking well, a straight-wall well II, a main pipe bell mouth, a branch pipe bell mouth and a flowing slot, wherein one side of the well base is connected with the main pipe bell mouth; the other side of the well base is connected with the branch pipe bell mouth; the bottom of the straight-wall well I is connected with the top of the well base; the bottom of the straight-wall well II is connected with the top of the straight-wall well I; the necking well is arranged between the straight-wall well I and the straight-wall well II; and the flowing slot is formed at the bottom of the well base. The necking plastic inspection well is attractive in appearance, simple in process, high in production efficiency and small in equipment investment; the well body connection and the bell mouth connection adopt a two-welding way, so that the integrality of the inspection well as well as the connecting strength and the sealing performance of the inspection well are ensured, and the inspection well is not deformed and the interface is not loosened due to nonuniform stress of filled soil, sedimentation and the like.

Rotary air purifier

Abstract: PROBLEM TO BE SOLVED: To provide an inexpensive air purifier whose installing area is made small so that it can be used in a dust generating work site of a narrow and closed space such as a tunnel digging jobsite and by which large gas volume to be treated is adopted and gas volume to be treated is arbitrarily changed according to dust generating conditions. SOLUTION: Around a cylindrical cage 1 horizontally installed and freely rotatable, a beltlike filter medium 4 drawn out from a draw-out roll 2 and going around the outer periphery of the cylindrical cage 1 and wound on a winding roll 3 is wound, and also one of a cylindrical open ends of the cylindrical cage 1 is covered with a blind cover 5, and another open end is connected to a suction duct 7 having a diameter smaller than that of the cylindrical cage 1 through a bell mouth 6 to suck the purified air.

Denitrifying water distributor

Abstract: The utility model discloses a denitrifying water distributor, which comprises a bracket, a draft tube fixed below the bracket and a bell mouth arranged at the lower end of the draft tube, wherein the bell mouth is a cylinder that becomes larger increasingly from the top downward; the lower end of the draft tube is communicated with the upper end of the bell mouth; a reflecting plate is arranged at the bottom of the bell mouth, and is a tapered plate with an upward top; and a water inlet extending from the draft tube, a cooling return conduit extending from the draft tube and an ultrafiltration return conduit extending from the draft tube are arranged in the draft tube. The denitrifying water distributor has a simple structure, distributes water uniformly, and can effectively eliminate bubbles in a nitration reactor.

Plastic tube butting technology

Abstract: The invention discloses a plastic tube butting technology, and belongs to the technical field of plastic tube processing technologies. The technology mainly comprises the following steps: 1, cleaning the internal surface and the external surface of a plastic tube end; 2, setting a coupling on the external surface of the plastic tube; 3, arranging a support device in the plastic tube; 4, using a flaring device to flare the end of the plastic tube to form a bell mouth; 5, carrying out cooling shaping of the bell mouth, and dismounting the flaring device and the support device; 6, installing a joint at the bell mouth, connecting the coupling with the joint, and compressing the bell mouth between the coupling and the joint; 7, connecting the other end of the plastic tube to a joint through a coupling; and 8, relatively connecting two flange connecting ends. The technology can guarantee that the flow of a butting pipeline is not influenced, can also guarantee that a butting position can bearing enough large radial impact force and axial impact force, and can be widely used in the plastic tube butting.

Blowout device of air conditioning duct

Abstract: PROBLEM TO BE SOLVED: To provide constitution capable of obtaining gentle cool air feeling like breeze and physically cooler air feeling at will with practically sama flow rate, and generating no cooling capacity drop and no uneven temperature distribution in a car room in the blowout device installed in an air conditioning duct of a bus or the like. SOLUTION: An orifice equipped with a diffusion type air passage having an equivalent opening area and a nozzle member equipped with a bell mouth type air passage are coaxially arranged in an blowout port of the air conditioning duct, and a moving mechanism for relatively displacing the orifice and the nozzle member in the axial line direction is installed. By separating the nozzle member from the orifice with the moving mechanism, the orifice is operated, cool air flows in the car room through the diffusion type air passage, gently cool air feeling can be obtained, and by approaching the nozzle member to the orifice, the nozzle member is operated, to flow cool air at high speed in the car room from the bell mouth type air passage, with which cooler air feeling can be obtained.