14 results about "Backdraft" patented technology

The utility model relates to the technical field of air cloth cover installation, in particular to a convenient disassembly and assembly structure of an air return prevention cloth cover of a livestock raising fan, which comprises a fan main body frame and an installation connection unit, and the installation connection unit comprises a right-angle plate, a sliding rail, an arc-shaped seat, a trapezoidal rod, a threaded rod, a knob frame, a protection assembly and a supporting assembly. The air return prevention cloth cover is arranged on the outer side wall of the fan body frame in a sleeving mode, the rotary knob frame is rotated to drive the threaded rod to rotate in the threaded hole, the threaded rod is driven to extend by means of the characteristics of threads, at the moment, the trapezoidal hole is matched with the trapezoidal rod to convert axial rotation of the threaded rod into driving force abutting against the arc-shaped base to move downwards, and the air return prevention cloth cover is clamped. In the process, the supporting assembly is used for assisting the arc-shaped base in fixing the air return prevention cloth cover, in this way, a worker can conveniently install the air return prevention cloth cover, a large amount of manpower and time cost consumed by maintenance and replacement of the air return prevention cloth cover is reduced, and efficient management and operation of a breeding place are facilitated.

The utility model discloses an anti-backflow air device, which is applied to a fresh air system and comprises a base assembly, an air inlet and an air outlet, and the base assembly is provided with a base air inlet and a base air outlet which are both communicated with the interior of a room; the separation assembly is provided with a separation air inlet and a separation air outlet; the mixing cavity assembly is arranged on the base assembly, and the mixing cavity assembly is provided with a mixing cavity air inlet and a mixing cavity air outlet; a mixing cavity is formed in the mixing cavity assembly, the mixing cavity assembly is connected to the base assembly, and the partition assembly is located in the mixing cavity; the driving assembly is connected with the separating assembly and used for driving the separating assembly to be switched between the first position and the second position. The partition assembly and the mixing cavity assembly are matched at different positions, so that the air opening is communicated or blocked, pollutants can be prevented from flowing back into a room, small animals can be prevented from entering the room, meanwhile, a fresh air system can be started even under the conditions of bad outdoor environment conditions and the like, and the fresh air system is protected. And internal circulation of indoor air is realized by utilizing the anti-backflow air device.

The invention discloses a garbage treatment system based on fly ash backdraft and low-nitrogen combustion, which comprises a garbage incineration waste heat boiler and a flue, a flue gas recirculation nozzle is arranged at a front arch and / or a rear arch of a hearth, the tail section of the flue is connected with a recirculation pipeline, and the recirculation pipeline is connected with the flue gas recirculation nozzle; an ash hopper is arranged at the communication part of the second flue and the third flue, and an ash discharge port is formed in the lower part of the ash hopper; and a water-cooling flow guide screen is arranged on the ash hopper and is used for separating large-particle fly ash. The device has the beneficial effects that the two functions of reducing nitrogen oxide and improving the combustion efficiency are integrated, generation of thermal NOx is restrained, and ignition of garbage entering the furnace is facilitated; particles can be reduced through the water-cooling flow guide screen, the combustion efficiency is further improved while emission of nitric oxide is reduced, and the combustion efficiency of the garbage furnace is effectively improved; fly ash is melted by utilizing a cyclone combustion technology, so that harmless treatment is realized.

The invention discloses a gas flow channel switching structure, a combustor with the gas flow channel switching structure and a combustion furnace with the gas flow channel switching structure, the gas flow channel switching structure comprises a first baffle located in a first channel and a second baffle located in a second channel, the first baffle and the second baffle are both movable, and the first baffle is constructed to seal the first channel; the first baffle and the second baffle are in motion connection, the first baffle moves to drive the second baffle to move, and correspondingly, the second baffle moves to drive the first baffle to move. By means of the gas flow channel switching structure, automatic switching of the gas flow channels can be achieved in the process that fuel in the device is continuously reduced, and reverse smoke generated when the fuel is burnt out is prevented from entering a room.

This invention relates to the field of civil engineering, and more particularly to a rapid switching ventilation device for main and backup tunnel fans. The technical solution includes a tee pipe and a branch pipe fixed to one end of the tee pipe. A sealing mechanism is provided on one side of the outer wall of both the tee pipe and the branch pipe. The sealing mechanism includes a sealing frame fixed to one side of the outer wall of the tee pipe and the branch pipe. A hydraulic pushing mechanism is provided on one side of the top of the sealing frame, and multiple rotating rods penetrate the inner wall of the sealing frame. This invention's rapid switching ventilation device for main and backup tunnel fans significantly shortens the switching time, improves the reliability and stability of the ventilation system, and prevents damage to the fans caused by backdraft and the unnecessary waste of airflow. By effectively utilizing natural wind at the tunnel entrance and optimizing fan operating parameters, it reduces fan energy consumption and carbon emissions, achieving green and environmentally friendly tunnel ventilation.

The utility model relates to the technical field of hot blast stoves, in particular to a direct combustion type hot blast stove which comprises a box body, a fan, a fire damper and a driving structure, a stove body is fixedly connected in the box body, a combustor is fixedly connected in the middle of one end of the box body, and the output end of the combustor extends into the stove body. The top of one end of the box body is fixedly connected with a backdraft pipe, the backdraft pipe is communicated with the furnace body, the bottom of the box body is fixedly connected with an air inlet pipe below the combustor, the middle part of one side of the box body is fixedly connected with a fan, the bottom of the box body is fixedly connected with an air outlet pipe below the fan, and a filter is fixedly connected between the fan and the combustor in the box body; a fire damper is arranged at the end, away from the combustor, of the box body, a driving structure used for driving the fire damper to move is installed at the end, close to the fire damper, of the box body, and the direct combustion type hot blast stove has the advantages of being accurate in temperature control, capable of saving energy and reducing consumption, safe and reliable.

A backdraft damper for a ventilation fan assembly, the backdraft damper having a main body having a wall defining an inner surface, an outer surface, a first open end and a second open end. An interior space is defined by the main body wall inner surface. A damper door is rotationally coupled to the main body wall and located within the interior space. The damper door defines a perimeter edge and the damper door is configured to rotate between (i) a closed position, in which the perimeter edge is located adjacent to the main body inner surface, and (ii) an open position in which a majority of the perimeter edge is not adjacent to the main body inner surface. A block extends from the main body wall inner surface into the interior space adjacent to the damper door perimeter edge when the damper door is in the closed position and, during operation of the fan assembly, creates an area of high pressure which creates a torque on the damper door.

This utility model relates to the field of well site blowout ignition technology, specifically to a firebreak wall and its blowout pool. The firebreak wall includes a main body and a fire-resistant wall. By using arc-shaped firebricks to construct the fire-resistant wall, when subjected to flame backdraft, the pressure from the backdraft is transmitted along the arc of the arc to the main body, reducing the impact on the lining material between the firebricks. This makes the fire-resistant wall less prone to deformation under flame backdraft, increasing its overall service life. Simultaneously, a strip-shaped cavity is formed between the fire-resistant wall and the main body, acting as a buffer and facilitating heat transfer through an air layer. This helps reduce the probability of deformation and damage during repeated use, further increasing the firebreak wall's service life and reducing maintenance and construction costs. Similarly, a blowout pool using the aforementioned firebreak wall has an extended overall service life and reduced maintenance and construction costs.

The application provides a backdraft explosion simulation device for fire training, and belongs to the technical field of simulation devices. The device specifically comprises a box body, a spraying system, an ignition system, a telemetry system, a control system, a supply system and a feeding system. One of the supply system and the feeding system shares an oil tank, an oil pump and a flame arrester, and is finally separated from a pipe tee to an oil atomizing nozzle. The feeding system comprises an oil path and a gas path. The gas path comprises a manual valve, a flame arrester, an electromagnetic valve, a combustible gas tank and a pipe. The device has a simple structure, is convenient to operate, and further reduces pollution.

The utility model discloses a kind of anti-back air mechanism of centrifugal fan, it is related to textile workshop cleaning equipment technical field, the mechanism includes fan shell, rotating motor, air inlet and impeller, at least two air outlets are equipped on fan shell, each air outlet is equipped with self-adapting check door component. The check door component is realized automatic opening and closing by the dynamic balance of airflow dynamic pressure and the moment effect of gravity or counterweight device: when fan operates, the airflow pressure generated by impeller pushes check door to open air outlet;When stopping, check door is automatically closed under the action of gravity or counterweight, and air flow is blocked in reverse flow. Up and down air outlet layout optimizes airflow distribution, synchronous opening and closing design enhances sealing reliability, without additional driving device, structure is simple and cost is low. The utility model significantly improves the suction efficiency of fiber inside cleaning box, with high reliability and practicality.

A damper is disclosed. The damper includes a blade having a slot, a jamb frame member having a hole, and a bearing for connecting the blade to the jamb frame member. The bearing has a first portion receivable in the slot of the blade and a second portion receivable in the hole on the jamb frame member to facilitate rotational movement of the blade.

The invention relates to a biomass gasification system and method with a dust removal function. The biomass gasification system comprises a gasification furnace, a combustor, a raw material supply module and a dust suction device. And the raw material supply module is used for conveying the crushed greening wastes or other biomass raw materials to the gasification furnace for gasification reaction so as to generate biomass fuel gas. An inlet of the dust suction device is arranged at the position close to an outlet of the raw material supply module and used for sucking entrained dust materials in the process that the raw materials fall into the gasification furnace, and the dust materials comprise wood chips, colloid fragments and other light combustible particles. And an outlet of the dust collection device communicates with an oxygen supply path of the combustor and is used for introducing dust materials into the combustor and mixing the dust materials with the biomass gas for combustion. By constructing a closed-loop path of'dust material suction-backdraft ', coking of the gasification furnace can be remarkably reduced, the gasification efficiency and the temperature rising rate of the combustor can be improved, efficient recycling of dust energy is achieved, and the overall operation stability and the heat energy output efficiency of the system are enhanced.

1. Name of the product in this design: Check valve. 2. Purpose of this design: To exhaust fumes in a smoke exhaust duct and prevent backdraft and reverse flow of cold air. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.