564 results about "Bell mouth" patented technology

The invention relates to the technical field of steel pipe connector forming, in particular to a bell and spigot type flexible connector steel pipe bell and spigot forming production line and method. In spigot forming equipment, all spigot forming modules are driven by a spigot forming driving mechanism to synchronously move towards the outer side in the radial direction of a spigot annular support; the rapid forming of the steel pipe socket can be easily completed; in the bell mouth forming equipment, an outer side forming driving mechanism drives all outer side forming modules to synchronously move towards the inner side in the radial direction of an outer side annular support, and an inner side forming driving mechanism drives all inner side forming modules to synchronously move towards the outer side in the radial direction of an inner side annular support. The rapid forming of the steel pipe socket can be completed; the forming machine is high in mechanization and automation degree, easy to operate and high in forming efficiency, the corresponding contours of the inner side forming module and the outer side forming module can be customized according to actual needs, and rapid forming of complex socket connectors of different structures can be met.

The utility model discloses a submarine cable center clamp falling maintenance device which is used for fixing a J-shaped pipe and a submarine cable and comprises a horn mouth clamp, an adapter flange, a metal limiter, a bending limiter and a telescopic transition joint. The horn mouth clamp is used for holding and fixing a horn mouth of the J-shaped pipe, two connecting grooves are oppositely formed in the horn mouth clamp, the two connecting grooves are matched to fix the adapter flange, the adapter flange is further connected with a plurality of metal limiters and a plurality of bending limiters, and the bending limiters are fixed with an undamaged limiter group through telescopic transition joints; the utility model is based on the maintenance device. According to the utility model, efficient underwater operation maintenance can be carried out on the damaged center clamp and the bending limiter, the submarine cable protection is enhanced, the service life of the submarine cable is prolonged, the maintenance operation difficulty is reduced, the construction steps are simplified, and the maintenance cost is greatly reduced.

A water injection pipe column and a steam injection heat insulation pipe are installed in a casing pipe in parallel, a horn opening is formed in the bottom of the water injection pipe column, and an oil pipe centralizer is arranged between the water injection pipe column and the outer wall of the steam injection heat insulation pipe; a double-pipe packer is arranged among the inner wall of the casing pipe, the outer wall of the water injection tubular column and the outer wall of the steam injection heat insulation pipe, an eccentric packer is arranged between the outer wall of the steam injection heat insulation pipe and the inner wall of the casing pipe, the bottom of the steam injection heat insulation pipe is connected with a rod type pump seat, and a pen point is installed at the bottom of the rod type pump seat. A sucker rod is installed in the steam injection heat insulation pipe, the bottom of the sucker rod is connected with a rod pump, and the rod pump is installed on a rod pump base. Water injection is carried out on a thin oil layer, steam huff and puff is carried out on a thick oil layer, then rotary pumping production is carried out, the well spacing number is reduced, and the block oil extraction speed is increased. Meanwhile, the tubular column further has the functions of negative pressure oil extraction and strong oil pipe righting, liquid production of an oil well is improved, and oil pipe winding is prevented.

The invention discloses a dip pipe for an RH vacuum refining device, which comprises an annular sleeve, a tubular partition wall and a horn mouth, the tubular partition wall is located in the middle of the annular sleeve, the axis of the tubular partition wall coincides with the axis of the annular sleeve, the upper part of the horn mouth is linked with the lower part of the tubular partition wall, and the lower part of the horn mouth is linked with the upper part of the tubular partition wall. The axis of the horn mouth coincides with the axis of the circular-tube-shaped partition wall, and the circular-tube-shaped partition wall, the horn mouth and the annular sleeve are connected through spiral warping plates which form angles with one another. The circular-tube-shaped partition wall and the inner side of the horn mouth jointly form an ascending tube of the dip tube, and the circular-tube-shaped partition wall and the annular sleeve jointly form a descending tube of the dip tube. The invention further discloses an air blowing method, the RH vacuum refining device using the dip pipe and the air blowing method, the circulation flow can be increased under the condition that the structure and the size of an existing RH vacuum refining device are not changed, and the efficiency of the RH vacuum refining device is improved.

The present invention belongs to the technical field of constant temperature and humidity air-conditioning units, and in particular to a bidirectional energy-saving constant temperature and humidity air-conditioning unit. In view of the problem in the prior art that the fan power will increase once the membrane cloth humidifier is turned on, the following scheme is proposed, including a unit cover with a square tubular structure placed horizontally as a whole, wherein the interior of the unit cover is fixed with a partition frame 1, a partition frame 2 and a sealing baffle with parallel and vertical plate surfaces, an air filter cloth is provided on the surface of the sealing baffle, and an evaporator module is provided in the middle of the partition frame 2, and the space between the partition frame 1 and the partition frame 2 is a humidification space. The present invention can not only allow the airflow to quickly pass through the bell mouth during ventilation and take away the water vapor on the surface of the water-absorbing membrane cloth 1 or the water-absorbing membrane cloth 2 on both sides, but also allow the airflow to quickly and easily pass through the gap between the two adjacent membrane cloths, avoiding the traditional need for pressurization and acceleration to pass through layers of membrane cloth, thereby greatly reducing wind resistance.

The invention relates to an automatic exhaust valve of a circulating cooling water system of a power plant. A horn mouth structure is formed on the inner side of an exhaust port of a valve body; the sleeve is arranged in the valve body and forms an exhaust channel with the inner wall of the valve body; the solid floating body is in vertical sliding fit in the sleeve; the hollow rubber ball is connected with the upper surface of the solid floating body through a first pull rope; when the valve body is filled with water, the hollow rubber ball and the solid floating body float upwards, so that the hollow rubber ball blocks the exhaust port and further presses the hollow rubber ball upwards under the action of buoyancy of the solid floating body, and water leakage caused by untight sealing of the exhaust port is prevented. When no water exists in the valve body, the hollow rubber ball and the solid floating body lose buoyancy and fall back naturally. The weight of the solid floating body can ensure that certain resistance can be overcome in the process, and the hollow rubber ball is pulled down through the first pull rope to prevent the hollow rubber ball from being clamped at the exhaust port and cannot fall back.

The invention belongs to the technical field of house building roof drainage, and particularly relates to a double-sleeve structure for inverted roof drainage and a construction method of the double-sleeve structure. The structure is composed of a DN100 pre-embedded sleeve, a DN50 newly-added sleeve, a connecting rib and a waterproof horn mouth. The two sleeves are concentrically welded into a whole, a top opening of the pre-buried sleeve is flush with the lowest point of a slope making layer and used for draining seepage water above a waterproof layer, and a top opening of the newly-added sleeve is higher than a finished surface and provided with a horn mouth used for collecting surface open water to form an upper-lower layered independent drainage channel. During construction, the double-sleeve assembly is synchronously pre-buried in one-time pouring concrete of the structural slab and the upturning beam, a slope making layer, a waterproof layer, a heat preservation layer and a protection layer are constructed in sequence subsequently, post drilling is not needed, and the heat preservation layer and the waterproof layer are not damaged. Hydrostatic pressure of the waterproof layer can be thoroughly eliminated, the leakage risk of the roof is remarkably reduced, and the device is simple in structure, accurate in positioning, durable, free of maintenance and suitable for newly-built and reconstructed inverted roofs.

The invention provides a stern side thrust hole design method, which comprises the following steps: S1, calculating pressure distribution and streamline distribution of the surface of a ship body; S2, determining the position of a stern side thrust hole; S3, designing a diversion trench based on the position of the side thrust hole: outwards extending the diversion trench by taking the side thrust hole as the center of a horn mouth to form a horn mouth structure with a deep inner part and a shallow outer part; the center point of a first arc at the front end of the intersecting periphery of the flow guide grooves right faces the water flow direction in streamline distribution of the tail of the ship. The water flow passes through the central point of the second arc at the tail end of the diversion trench; and S4, designing grids in the side pushing hole, wherein the first grid is parallel to the water flow direction, and the second grid is perpendicular to the first grid. According to the design method of the stern lateral thrust hole, the resistance of the ship body after the hole is formed is effectively reduced, through the shape and depth design of the diversion trenches, the pressure distribution at the diversion trenches is uniform and gentle, the pressure gradient is small, the transition is smooth, local stress concentration and flow separation are reduced, and the resistance of the small stern lateral thrust hole to the ship body is reduced; and the influence on the rapidity of the ship is reduced.

The utility model discloses an automatic alignment device for eccentric bolt processing, which comprises a platform, a cover plate and an alignment component, the platform is supported by a cushion frame, a bell mouth is arranged on the platform and is used for placing the head of an eccentric bolt, a shaft hole vertically penetrating through the platform downwards is arranged in the bell mouth, and a screw of the eccentric bolt penetrates through the shaft hole. The cover plate is connected with the platform through a pin column, the cover plate can pivot to the position above the bell mouth, a limiting part capable of preventing the head of the eccentric bolt from inclining is installed on the cover plate, the alignment assembly comprises a first arc plate fixedly connected to the lower end of the shaft hole and a first telescopic source installed at the bottom of the platform, and the movable end of the first telescopic source is connected with a second arc plate; the second arc plate and the first arc plate can be spliced to form a clamping cavity, and the clamping cavity clamps the eccentric bolt screw and is collinear with the center line of the eccentric bolt screw. According to the automatic centering device, automatic centering and clamping of the eccentric bolt are achieved, only the eccentric bolt needs to be taken and placed, operation is easy and convenient, and the centering efficiency is effectively improved.

Air horns and methods for their operation. Such an air horn includes a main body having a cavity, a base, an actuator housing, and a diaphragm housing and bell fluidically connected to the cavity and to a channel within the main body. The actuator housing has a wall, a cavity surrounded by the wall, and standoffs within the cavity that define first and second sets of gaps between pairs of the standoffs. An actuator is coupled to the actuator housing so as to have first and second rotational positions. The actuator includes a shaft received in the cavity and standoff guides that individually receive pairs of the standoffs. The standoffs and the standoff guides interact to only permit axial movement of the actuator relative to the actuator housing when the actuator is in the first and second rotational positions and not at any rotational position therebetween.

The utility model provides a protection device for an automatic pressure maintaining system of a shield tunneling machine. The protection device comprises a connecting pipe communicated with the automatic pressure maintaining system and the shield tunneling machine soil bin, a pipe opening of the connecting pipe is located on a breast plate of the shield tunneling machine soil bin, the protection device further comprises a seamless steel pipe elbow matched with the pipe opening of the connecting pipe, and one end of the seamless steel pipe elbow is fixed to the pipe opening of the connecting pipe in a butt joint mode. The other end of the seamless steel pipe elbow faces downwards, a horn mouth is arranged at an end opening of the seamless steel pipe elbow, the small-opening end of the horn mouth is in butt joint and fixed with the end opening of the seamless steel pipe elbow, a grating is fixed on the large-opening end face of the horn mouth, and a floating ball is movably arranged in the horn mouth. The automatic pressure maintaining system is simple in structure, the problem that the automatic pressure maintaining system is damaged due to the fact that muddy water intrudes through an automatic connecting pipeline when the position of muck in a soil cabin is high in an existing automatic pressure maintaining system is solved, and the risk that the automatic pressure maintaining system is damaged in the shield tunneling process is greatly reduced.

The invention belongs to the technical field of wind tunnel simulation, and particularly discloses a complex environment wind field simulation device, which comprises a test cabin, a fan system and a wind guide curtain assembly, the test cabin comprises a pressure stabilizing cabin, an inner cabin and an outer cabin, the fan system comprises a rotational flow fan, a horizontal flow fan and a vertical flow fan, and any cabin wall of the inner cabin is provided with a wind wall. An air return wall is arranged opposite to the air wall; the multiple rotational flow fans are evenly arranged in the circumferential direction of the bottom of the inner cabin at intervals. The vertical flow fans are uniformly distributed on the peripheral side walls of the pressure stabilizing cabin; a movable horn mouth is formed in the top of the inner cabin; the air guide curtain assembly is arranged in the inner cabin and comprises two groups of horizontal air channel roller shutters which are arranged in the inner cabin and can be unfolded or folded; the fan system, the horn mouth, the horizontal air channel roller shutter and the air guide curtain assembly are selectively started to form different closed wind environment modes, and simulation of a complex wind field coupled by multiple physical fields is achieved. The invention further discloses a simulation method using the complex environment wind field simulation equipment.

The invention relates to a sound insulation and noise reduction composite material and a preparation method and application thereof, and belongs to the technical field of sound insulation materials. The sound insulation and noise reduction composite material comprises a first polyvinyl chloride layer, a second polyvinyl chloride layer, a silicone rubber sound absorption layer and a butyl damping layer which are sequentially arranged in an attached mode. The center lines of the through holes in the first polyvinyl chloride layer coincide with the center lines of the through holes in the second polyvinyl chloride layer, it can be ensured that the through holes in the first polyvinyl chloride layer and the second polyvinyl chloride layer are combined to form a shape similar to a horn mouth, sound is gradually weakened, and the effects of sound insulation and decoration are achieved; the silicone rubber sound-absorbing layer is an elastic body, so that the transmission of upstairs and downstairs collision sound can be further reduced; the butyl damping layer can block the transmission of collision sound upstairs and downstairs, and the butyl material has certain adhesiveness and can be adhered to a floor and other parts needing noise reduction, so that positioning is convenient.

A bell mouth includes a circumferential wall, and a pressure changing component permeable portion arranged in the circumferential wall at a location where a separated distance from an axial fan is minimal. A fan unit includes the bell mouth, an axial fan, and a case that accommodates the axial fan and the bell mouth. The fan unit has an air layer between the circumferential wall of the bell mouth and the case.

The utility model relates to a constructional column bellmouth chiseling-free concrete pouring device which comprises a formwork, a fixing plate and an inclined back plate, the inclined back plate is fixedly arranged on the formwork through the fixing plate, the top of the inclined back plate is provided with an opening, the end, away from the formwork, of the inclined back plate is provided with an inclined face, the bottom of the inclined face is provided with an opening, and the bottom of the inclined face is provided with an opening. A sliding inclined plate is arranged on the inclined face in a sliding fit mode, the sliding inclined plate can seal an opening of the inclined face, chiseling treatment on the joint position after pouring is avoided, excess materials are recycled through the device, material waste and environmental pollution are reduced, the construction period is shortened, the labor input amount is reduced, and the construction cost is reduced.

The utility model discloses a plastic top pull pipe and a connecting structure of the plastic top pull pipe, which comprise a pipe main body, one end of the pipe main body is provided with a bellmouth, the other end of the pipe main body is provided with an inserting opening matched with the bellmouth, the inserting opening is sleeved with a cleaning piece used for cleaning the surface of the inserting opening and a bonding piece containing glue inside, and the cleaning piece and the bonding piece are matched with each other. The cleaning piece is located on the side, close to the bellmouth, of the bonding piece. The connecting structure comprises at least two plastic jacking and pulling pipes, wherein the inserting opening of one plastic jacking and pulling pipe is inserted into the bell mouth of the other plastic jacking and pulling pipe. According to the utility model, the connection of the plastic top-pull pipe is more convenient, the processing technology is simple, and the production efficiency is improved while the connection reliability is ensured.

The present invention discloses a fairlead hole structure for a double-hull bulwark, comprising a double-hull bulwark portion, a fairlead hole portion and a connecting bracket; the fairlead hole portion comprises an outer sealing plate, an intermediate cylindrical sealing plate, an inner sealing plate, an outer round steel and an inner round steel; the outer sealing plate and the inner sealing plate are both one-way curved plates with a conical bell mouth; the two ends of the outer sealing plate are respectively welded to the outer end ports of the bulwark outer plate and the intermediate cylindrical sealing plate; the two ends of the inner sealing plate are respectively welded to the inner end ports of the bulwark inner plate and the intermediate cylindrical sealing plate; the outer round steel and the inner round steel are both annular and respectively welded to the two end ports of the intermediate cylindrical sealing plate; a plurality of connecting brackets are radially arranged at equal angles around the center of the intermediate cylindrical sealing plate and are welded to the fairlead hole portion and the double-hull bulwark portion on all sides. The present invention can make the fairlead hole and the double-hull bulwark structure self-contained, can be manufactured and formed on site in one go, avoiding the problem of secondary construction, and at the same time has the advantages of high structural strength, rigidity and stability, simplicity, economy and beauty.

Embodiments disclosed herein relate to a blower unit for a vehicle and an air conditioning device including the blower unit. The blower unit includes: a volute shell having a suction port formed therein; a fan rotatably disposed in the volute shell; a motor having a shaft connected to the fan; and a bell mouth disposed at the suction port, wherein the inner end of the volute shell forming the suction port is arranged to be radially spaced from the fan to form a gap, and the bell mouth prevents the air flowing due to the rotation of the fan from flowing back through the gap. Therefore, the blower unit for a vehicle and the air conditioning device including the blower unit can prevent the air from flowing back to the outside of the volute shell by the arrangement of the bell mouth and the volute shell and the structural shape of the bell mouth.

The invention discloses a normal-temperature and high-temperature wall surface static pressure measurement integrated assembly which comprises a static pressure measurement integrated assembly body capable of introducing normal-temperature or high-temperature airflow without causing blockage of a pressure guide pipe. The pressure guide pipe and the spherical joint are hermetically welded through the metal welding layer, and the spherical joint and the conical horn mouth of the pressure guide hole in the static pressure measuring seat form linear sealing, so that the problem that colloid melts and flows into the pressure guide pipe to cause blockage is solved when high temperature of introduced high-temperature airflow occurs.

A heat source unit (1) of an air heat pump has a housing (10), a fan (22) housed in the housing (10) and rotatable about a central axis (30), a bell mouth (32) having an opening (32), and a grille (40, 42) covering the opening (32). The grille (40, 42) comprises a plurality of longitudinal first louvers (46), where each of the first louvers (46) has an inlet portion (66) facing the fan (22), and at least the inlet portions (66) are inclined with respect to a central axis (30) of the fan (22), where the inclination angle (alpha) varies in the longitudinal direction of the respective first louvers (46).

The utility model relates to the technical field of air conditioner installation, in particular to a heating ventilation air conditioner installation structure which comprises an outer shell, an inner shell and an outer shell. The opening part of one end, arranged in the shell, of the limiting pipe is a conical horn mouth; the outer side of the conical nut is a conical surface, a threaded hole is formed in the center of the conical nut, the conical nut is divided into two parts along the axial section, the conical nut is located in the horn mouth, and opening parts at the two ends of the conical nut are conical openings; the bottom support is arranged in the shell, and the end of the bottom support is located at the conical opening; the two ends of the compression spring abut against the conical nut and the bottom support respectively. The end part of the top pressing pipe is positioned in the conical opening, far away from the bottom support, of the conical nut; the utility model has the advantages of convenient and fast installation.

According to the post-grouting steel column base and the construction method, the steel column base adopts a hollow steel pipe, and the bottom of the steel column base is made into an expanded horn mouth; grouting holes are formed in the bottoms of the steel column feet; both the grouting hole and the hand hole are provided with threads and plugs; a civil foundation connected with the steel column base is provided with a cup opening with the narrow upper portion and the wide lower portion, and anchoring steel bars are embedded in the cup opening. The steel column base is installed on site through two times of grouting, the first time of grouting is conducted from the edge of a cup opening, the cup opening on a civil engineering foundation is fully filled, and meanwhile the original open column base is changed into a closed space; after first grouting hardening, the upper steel column and the steel beam which are connected with the steel column base can be installed; the micro-expansion grouting material is poured from a grouting opening in the lower end of the steel column foot for the second time of grouting, and the hole is locked by screwing a bolt after the micro-expansion grouting material is fully grouted until the grouting material is hardened. The construction site civil engineering foundation can be independently constructed, and adjustment space is available during installation; the connection strength is higher than that of a traditional mode.

The utility model discloses a bellmouth structure of a steel pipe flexible connector, which comprises a bellmouth steel pipe, a conveying steel pipe is arranged at the rear end of the bellmouth steel pipe, a bearing platform is arranged at the joint of the bellmouth steel pipe and the conveying steel pipe, a sealing gasket is mounted at the bearing platform, and the sealing gasket is detachably connected with the bearing platform; a plurality of sealing assemblies are arranged on the inner side face of the socket steel pipe from front to back, each sealing assembly comprises an installation ring and a sealing ring, the sealing rings and the installation rings are connected together in a clamped mode, elastic supporting rings are arranged on the inner sides of the installation rings, and the elastic supporting rings are connected to the inner sides of the sealing rings in an inserted mode. The bearing platform is arranged at the joint of the socket steel pipe and the conveying steel pipe, the sealing gasket is installed on the bearing platform, the inserting steel pipe is inserted into the inner side of the socket steel pipe and then abuts against the sealing gasket, and therefore the first sealing effect is achieved; and a plurality of sealing assemblies are arranged on the inner side face of the socket steel pipe, and the sealing assemblies can well seal the socket steel pipe and the inserting steel pipe.

The utility model discloses an electric sunroof guide rail assembly, and relates to the technical field of automobile parts. Comprising a guide rail assembly, the guide rail assembly comprises a guide rail part and a vehicle body fixing plate arranged on one side of the guide rail part, a mechanical set sliding groove is formed in the guide rail part, a mechanical set flexible shaft channel is formed in one side of the inner wall of the mechanical set sliding groove, and a first horn mouth is formed in one end of the mechanical set flexible shaft channel; the first horn mouth is provided with a first arc transition part, and the top of the guide rail part is provided with a first X-direction positioning station located above the mechanical set flexible shaft channel. One end of the mechanical group flexible shaft channel is provided with a horn mouth I, the other end of the mechanical group flexible shaft channel is chamfered, and the horn mouth I is provided with an arc transition part I. By adopting the design mode, burrs can be effectively reduced, the butt joint of the mechanical group and the mechanical group flexible shaft channel is more efficient, the clamping condition is avoided, the assembly difficulty is greatly reduced, and the assembly efficiency is improved; the economic benefit is met and the application prospect is wide.

The utility model discloses a down-blowing device with automatic clamping and releasing functions for inserts, and belongs to the technical field of blow molding devices. Comprising a pull-down acting cylinder supporting plate and a pull-down acting cylinder, and the pull-down acting cylinder is fixed to the upward side of the pull-down acting cylinder supporting plate; the insert mounting bracket is fixed with the upper end of the pull-down acting cylinder column; a group of insert clamping jaws are formed at the upper end of the insert clamping jaw pipe, and a clamping jaw tensioning groove is formed between every two adjacent insert clamping jaws; the lower air blowing pipe lifting acting cylinder is fixed to the lower end of the pull-down acting cylinder column, the lower end of the lower air blowing pipe extends into the lower air blowing pipe guide sleeve and is connected with the upper end of the lower air blowing pipe lifting acting cylinder column, and the upper end of the lower air blowing pipe lifting acting cylinder column forms a horn-mouth-shaped air outlet head. And the outer wall of the horn-mouth-shaped air outlet head is matched with or released from the group of insert clamping claws. The mold has the advantages that the mold insert can be reliably combined with the opening part of the plastic hollow container, and the mold insert and the formed hollow plastic container can be conveniently taken away after blowing is completed.

An outdoor unit according to the present invention comprises: a box-shaped housing in which an intake port and a blowout port are formed; and an axial flow fan that is disposed inside the housing and rotates to form airflow. The housing has a cylindrical bell mouth that constitutes the blowout port and surrounds the outer circumference of the axial flow fan. The axial flow fan is provided with: a hub that is rotationally driven and forms a rotating shaft; a plurality of blades that are formed around the hub and extend radially outward from the hub; and a cylindrical ring part that is formed in an annular shape when viewed in the axial direction of the rotating shaft and is integrally formed with each blade end at the radially outer side of the plurality of blades. In the axial flow fan, a portion on the downstream side in the direction of the air flow formed by the rotation of the axial flow fan is positioned inside the bell mouth, and a portion on the upstream side thereof is positioned outside the bell mouth, and the ring part is disposed further to the upstream side than the bell mouth inside the housing.

The utility model provides a novel bell and spigot joint structure and a novel joint prestressed concrete cylinder pipe, which relate to the technical field of concrete pipes, and comprise a bell mouth ring, a spigot ring and a double-layer rubber ring structure, the socket ring and the spigot ring are matched with each other to form a socket interface; the double-layer rubber ring structure is arranged on the spigot ring and located at the position in contact with the socket ring. The double-layer rubber ring structure comprises a first rubber ring and a second rubber ring, the width of a first rubber ring groove is larger than that of a second rubber ring groove, the depth of the first rubber ring groove is smaller than that of the second rubber ring groove, and the double-layer rubber ring structure can better adapt to changes of the corner of a bell and spigot. The technical problems that in the prior art, due to the fact that rubber rings are the same in size at the bell and spigot joint, foundation settlement is caused, the connector corner adaptability is poor, and the sealing performance of a connector is affected are solved.

The utility model discloses a demisting and reflowing device for a rolling line. The demisting and reflowing device comprises an air suction cover, a fan assembly, a suction pipeline, a demister and a reflowing pipe, a horn-mouth-shaped air suction cover is horizontally erected at the position, where a large amount of water mist is formed, of an inlet and outlet of the rolling mill, the lower end of the air suction cover is a large-diameter end, the upper end of the air suction cover is communicated with one end of the suction pipeline in a sealed mode, and the other end of the suction pipeline and one end of the backflow pipe are both communicated with the lower end of the vertically-arranged demister in a sealed mode. The other end of the return pipe extends to the slag sluice; a draught fan assembly is further arranged in the air suction cover, on-site mist is sucked away through the draught fan assembly and sent into the demister to be subjected to gas-liquid separation, and formed liquid drops flow into the backflow pipe due to gravity and flow back to the slag flushing trough through the backflow pipe to be recycled. According to the demister, water mist generated on site can be effectively removed, liquid drops collected by the demister can flow back to the slag sluice, and the consumption of circulating water is reduced.

The utility model relates to a safety fan which comprises a fan unit, a machine head, a supporting unit and a base, the fan unit comprises a front fan cover, a rear fan cover and fan blades, the front fan cover and the rear fan cover form a fan cover, each of the front fan cover and the rear fan cover is provided with a net structure composed of a plurality of net ribs, the cross section of each net rib is in a horn shape, and the fan blades are arranged on the front fan cover and the rear fan cover. Every two adjacent net ribs form a horn-shaped grid air opening, the horn mouth direction of the grid air opening of the front fan cover is consistent with the air outlet direction, the horn mouth direction of the grid air opening of the rear fan cover is consistent with the air inlet direction, and the fan blades are arranged in the fan cover inner cavity. The machine head is fixedly connected with the air inlet surface of the rear fan cover; one end of the supporting unit is connected with the base, and the other end of the supporting unit is connected with the machine head. The safe fan is simple in structure and capable of preventing children from touching the fan by mistake and guaranteeing the normal use air outlet amount of the fan at the same time.

The utility model relates to the technical field of drainage pipes, in particular to a concrete drainage pipe with good sealing performance, which comprises a drainage pipe main body, an inserting opening is arranged on one side of the drainage pipe main body far away from a bell mouth, a second connecting ring is fixedly connected inside the inserting opening, and the second connecting ring is matched with a first connecting ring. A sliding groove is formed in the second connecting ring, a spring is sleeved with the sliding groove, a limiting rod is sleeved with the inner surface of the spring, the first connecting ring and the second connecting ring are aligned in parallel to be matched, the drainage pipe body is rotated after matching is completed, and the first connecting ring rotates in the second connecting ring; and after rotating to a designated position, the spring drives the limiting rod to limit the first connecting ring, so that connection between the drainage pipe bodies is completed, the parallelism during connection of the drainage pipe bodies is improved, the sealing assembly is more tightly attached, the sealing performance is improved, and the situation that due to connection error superposition, deviation is caused, and accumulated water falls on a slope due to gaps is avoided.