38 results about "Backdraft" patented technology

The invention relates to the technical field of biomass carbonization, in particular to a biomass continuous carbonization kiln based on a double-layer rotary kiln structure and application of the biomass continuous carbonization kiln. A biomass continuous carbonization kiln comprises a rotary kiln body, a heating box body and a sealing system. According to the invention, preheating and carbonization are carried out in sections through the inner and outer layer guide plates, the carbonization time is prolonged by 30%, and the product yield is improved by 15%; oxygen permeation is controlled through triple sealing, the deflagration risk is reduced, and safety is good; heat energy closed-loop utilization: flue gas purification, tail gas backdraft and waste heat drying are integrated, comprehensive energy consumption is reduced by 25%, flue gas waste heat is fully recycled, heat energy is utilized in a stepped mode, energy consumption is low, and environment-friendly production is achieved; the explosion-proof device is linked with the cooling system, so that the problem of passive protection only depending on buffer filler in the prior art is effectively solved, and the safety controllability is high.

A forming device for hot forming a component, such as a steel door panel for a vehicle, is provided. The forming device includes an upper cam slide and a lower fill slide which form a heated steel blank into the component therebetween. The upper cam slide and the lower fill slide are designed to form the desired shape and material properties in the component, such that no post forming operations are needed. The lower fill slide also retracts from the upper cam slide after forming the component, such that the component can be easily removed from the forming device and a backdraft situation is avoided.

A terminal unit for a heating, ventilation, and / or air conditioning (HVAC) system, including: a housing including a base wall, a first chamber configured to receive a first air flow, and a second chamber configured to receive a second air flow; an internal wall disposed within the housing and extending between the first chamber and the second chamber, wherein the internal wall includes an opening formed therein, and wherein the second air flow selectively flows through the opening from the second chamber to the first chamber along an air flow path; and a damper door rotatable relative to the internal wall and configured to substantially prevent the first air flow from flowing through the opening from the first chamber to the second chamber in a closed position, the damper door positioned at an angle relative a vertical plane that is perpendicular to the base wall.

The present invention discloses a backdraft training device for Class A substances (wood), which relates to the technical field of fire simulation training. It includes a training room and a door panel fixedly installed at its bottom end. The door panel is rotatably installed on the training room, and further includes: a side baffle, which is vertically slidably installed on the side wall of the training room; a connecting rod, which is fixedly installed above the side baffle, and a top plate is fixedly installed at the top end of the connecting rod; a rotating shaft, which is rotatably installed on the side wall of the training room, and a rotating rod is fixedly installed on the rotating shaft, and long plates are arranged at both ends of the rotating rod. After the backdraft training is carried out in the training room in the present invention, the rotating rod is rotated by an electric push rod or other driving mechanisms. At this time, as the rotating rod rotates, the side baffle will be opened, and at the same time, the bottom plate will rotate upwards to pour out the ashes on the surface. And while the side baffle is closed, the top plate squeezes the air flow inwards, so that the combustibles on the bottom plate are quickly blown out, thereby facilitating the rapid cleaning of the training room.

The invention relates to the technical field of metallurgical engineering, and particularly discloses an iron ore rotary kiln high-temperature flue gas waste heat utilization device and method. The problems that in the prior art, a kiln body forms rings, temperature distribution is uneven, and waste heat is not utilized are mainly solved. The core of the device comprises an air heat exchanger arranged in a gravity settling chamber, a discharge end sleeve type burner, and a blowpipe array (each pipe is provided with a spherical air nozzle) arranged along the kiln wall of the high-temperature reduction section at an interval of 0.8-1.2 m. The method comprises the following steps: pressurizing air to 20-60kPa, introducing the pressurized air into an air heat exchanger, and carrying out heat exchange with flue gas at 600-700 DEG C to produce preheated air at 580 DEG C; then, preheated air is introduced into the sleeve type burner to form diffusion flames larger than 10 m; 2-3 kPa of air is blown into the blowpipe through the partition kiln back fan, and the air is radially sprayed into the kiln through the spherical spray head. The purposes of uniformizing the temperature of a high-temperature section in the kiln, increasing the temperature of a cooling section and preventing ring formation of the rotary kiln are achieved while waste heat of high-temperature flue gas is recycled.

The present furnace chamber with complete combustion of coal relates to the field of industrial and municipal heating, as well as to furnace chambers in which coal is burnt. The bricks of a brick pipe are arranged vertically and the brick pipe extends below plugs disposed in cooling pipes. Coals situated at the outlet from the brick pipe into a furnace lie in contact with the brick pipe along the entire perimeter, and the low temperatures below the cooling pipes do not lower the temperature of the coals at the outlet from the brick pipe and do not cause the formation of black spots of unburnt coal below the cooling pipes, thus preventing flue gases from escaping into the furnace and also preventing small coals from dropping into the furnace. The bricks of the brick pipe wall are braced by brick supports (32) which maintain the integrity and stable fixed position of the bricks of the wall of the brick pipe (17), thus preventing the formation of cracks at the joins between the bricks and ensuring that the flue gases remain sealed off from the furnace gases. Backdraft is prevented from occurring in flue gas pipes (12) and there is no movement of flue gases back into a housing (7) and from there into an exhaust flue through broken seals in the joins of the bricks of the brick pipe.

The utility model relates to the technical field of vacuum pump units, and discloses a suction filtration anti-suck-back device of a vacuum pump, which comprises a first container, a second container, a third container and a fourth container, the air inlet pipeline extends into the first container from the first inlet; an adsorption layer is arranged in the second container; two ends of the middle pipeline are respectively communicated with the first outlet and the second container; one end of the air outlet pipeline communicates with the second container, and the other end communicates with an air suction port of the vacuum pump; the air inlet pipeline extends in the first container to form a buffer pipe section, and a pipe opening of the buffer pipe section is lower than the first outlet; according to the suction filtration anti-suck-back device of the vacuum pump provided by the utility model, the first container and the second container are arranged for dual trapping, so that waste liquid and volatile gas entering the vacuum pump are effectively reduced; the extended arrangement of the buffer pipe section prevents waste liquid and volatile gas from directly entering the second container through the first outlet, prolongs the residence time of the volatile gas in the first container, increases the condensation efficiency, improves the trapping efficiency, and effectively protects the vacuum pump from being polluted.

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.

A forming device (10) for hot forming a component (12), such as a steel door panel for a vehicle, is provided. The forming device includes an upper cam slide (16) and a lower fill slide (18) which form a heated steel blank into the component (12) therebetween. The upper cam slide (16) and the lower fill slide (18) are designed to form the desired shape and material properties in the component (12), such that no post forming operations are needed. The lower fill slide (18) also retracts from the upper cam slide (16) after forming the component (12), such that the component (12) can be easily removed from the forming device (10) and a backdraft situation is avoided.

The utility model relates to the technical field of hot water supply equipment, and discloses a dual downdraft prevention structure of a gas water heater. The dual-downdraft-prevention structure of the gas water heater comprises a containing cylinder, a first downdraft-prevention mechanism and a second downdraft-prevention mechanism, the first downdraft-prevention mechanism is arranged in a first channel and comprises a first shaft seat, a first rotating shaft and two first downdraft-prevention covers, and the two first downdraft-prevention covers are rotatably arranged on the first shaft seat through the first rotating shaft; the two first down draft preventing covers are used for opening or closing the first channel, the second down draft preventing mechanism comprises a second shaft seat, a second rotating shaft and a second down draft preventing cover, and the second down draft preventing cover is rotatably arranged on the second shaft seat through the second rotating shaft. According to the utility model, the double-door type first downdraft-preventing mechanism and the single-door type second downdraft-preventing mechanism are arranged in the accommodating cylinder, so that the downdraft-preventing sealing effect is ensured, the assembly of the double downdraft-preventing structure is facilitated, and the production cost is reduced.

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 utility model relates to the technical field of boilers, and discloses an environment-friendly energy-saving boiler which comprises a boiler barrel, a support is fixedly installed at the bottom of the boiler barrel, a backdraft bin is fixedly installed at one end of the boiler barrel, a front smoke box is fixedly installed at the other end of the boiler barrel, a front door plate is installed on the front smoke box in a clamped mode, and a rear door plate is installed on the rear smoke box in a clamped mode. And a rear door plate is mounted on the backdraft bin in a clamping manner. According to the environment-friendly and energy-saving boiler, in order to further reduce pollution to the environment, the adsorption assembly is arranged and matched with flue gas to enter the shell through the guide pipe, meanwhile, adsorption holes in an adsorption barrel can adsorb harmful substances in the flue gas, when the adsorption barrel is saturated in adsorption, a turbine drives a straight rod to rotate under the action of flue gas flowing, and the flue gas enters the straight rod; the supporting rod compresses the spiral spring, when the spiral spring is compressed to a certain degree, the warning button is triggered, a worker is reminded to replace or clean the adsorption barrel, and it is ensured that the adsorption assembly continuously and effectively purifies smoke.

The present invention relates to the technical field of gas appliances, and discloses an anti-backdraft device and a gas water heater, which includes a pipe body. The pipe body includes a section of horizontal straight pipe and a section of L-shaped elbow pipe. The horizontal straight pipe is communicated with the L-shaped elbow pipe, and the outer port of the horizontal straight pipe is the smoke outlet. A Venturi tube is arranged in the lower section of the L-shaped elbow pipe. There is a gap between the outer wall of the Venturi tube and the inner wall of the lower section of the L-shaped elbow pipe. A side through hole is arranged on the pipe wall of the L-shaped elbow pipe corresponding to the middle section of the Venturi tube. The edge of the bottom port of the Venturi tube is connected to the edge of the bottom port of the L-shaped elbow pipe. The bottom port of the Venturi tube serves as the smoke inlet, and an anti-backdraft plate is arranged at the upper port of the Venturi tube. When there is backdraft from the outside and the anti-backdraft device is sealed to a certain extent, the outside backdraft can be bypassed at the same time; the water heater is protected from shutting down, and the low-temperature cold air is prevented from backflowing and impacting the water, resulting in cracking of the water tank.

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 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 belongs to the field of fire scene monitoring, and discloses a flashover and backdraft fire scene real-time monitoring and intelligent early warning system and method. The sampling module is used for collecting the surface layer temperature, the ceiling temperature and the fire scene gas concentration in a preset time period; the processing module is used for extracting statistical characteristics and change characteristics according to the surface layer temperature and the ceiling temperature and extracting cross term characteristics according to the fire scene gas concentration; training by utilizing statistical characteristics and change characteristics of the average temperature, the surface layer temperature and the ceiling temperature to obtain a flashover detection model; combining cross term feature training to obtain a backdraft detection model; carrying out real-time detection by utilizing the trained flashover detection model and backdraft detection model, and judging the risk level of the current fire scene according to a threshold value and a real-time detection result; and the image transmission module is used for displaying the real-time detection results of the flashover detection model and the backdraft detection model and the risk level of the current fire scene. According to the invention, limitation of traditional data acquisition is broken through, and fire scene monitoring accuracy and generalization are improved.

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.

The utility model discloses a pneumatic solid material conveying device, which belongs to the field of material conveying and comprises a stock bin, a feed opening is arranged at the bottom of the stock bin, an air closing machine is arranged at the bottom end of the feed opening, the bottom end of the air closing machine is communicated with a material blowing pipe, one end of the material blowing pipe is used for being connected with a boiler, and the other end of the material blowing pipe is used for being connected with a material blowing fan. The air seal machine is arranged at the discharging opening in the bottom of the stock bin for discharging, smooth, even and continuous discharging is guaranteed, meanwhile, air pressure separation of the upper portion and the lower portion of the air seal machine is achieved, and raised dust caused by air return is prevented. Meanwhile, the equipment is simple in structure, small in occupied area, convenient to operate and high in practicability, and a good effect is achieved in actual engineering use.

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.

In order to solve the problems of low combustion efficiency caused by different combustion efficiencies of natural gas and hydrogen and safety accidents caused by hydrogen backdraft of a traditional hydrogen-doped natural gas turbulent burner, the hydrogen-doped natural gas turbulent burner comprises a porous hydrogen inlet, a plurality of natural gas inlets, a cyclone and a plurality of secondary air inlets, the secondary air inlet, the natural gas inlet and the hydrogen inlet are sequentially arranged from outside to inside, and the cyclone is mounted between the natural gas inlet and the hydrogen inlet; a plurality of cylindrical straight holes are formed in the top of the hydrogen inlet and are distributed in a concentric circle array. By means of mixed combustion of natural gas and hydrogen, the combustion efficiency is improved, generation of nitric oxide is reduced, and the efficient and clean combustion effect is achieved; the combustion rate of the natural gas is increased through rapid combustion of hydrogen, flame robustness is good, hydroxyl released in the hydrogen combustion process can effectively reduce combination of nitrogen elements in air and oxygen, and generation of nitric oxide is inhibited. The invention belongs to the technical field of energy and chemical engineering.

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 damper system includes a backdraft damper frame, vertically oriented damper blades and a dock frame. A corner piece of the damper frame is attached to perpendicular first and second sides. A set screw passes through the corner piece at an axis that is not parallel to a damper plane defined by rear edges of the sides. The damper blades rotate into open and closed orientations. Portions of the damper blades extend beyond the damper plane when the damper blades are in the open orientation. A dock corner of the dock frame is attached to perpendicular third and fourth sides. The damper plane is parallel to a dock plane defined by front edges of the third and fourth sides. The dock corner has a set screw receiver that extends past the dock plane into the damper plane. The set screw from the corner piece enters into the set screw receiver.

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 application discloses a backdraft intelligent prevention system and method based on airflow regulation, and relates to the technical field of fire prevention.Compared with the previous fire prevention system, the application solves the problem that the traditional backdraft prevention method cannot adaptively adjust the strategy to cope with different fire development stages and complex environmental changes, and is difficult to meet the needs of modern fire safety protection; by fusing multi-sensor data to comprehensively consider the environmental factors in the region, combining the backdraft prediction model of the knowledge graph and the optimized extreme learning machine to analyze and predict backdraft, and intelligently regulating the airflow based on the backdraft risk, the system can automatically adjust the ventilation equipment parameters to reduce the possibility of backdraft occurrence.The system has adaptability and reliability, can self-learn and adapt to different scenes, and improves energy utilization efficiency.Meanwhile, the system is convenient to integrate and manage, integrated with other systems, provides a convenient interactive interface, facilitates remote monitoring and management, and improves the overall safety and efficiency.

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.

The invention discloses an anhydrous semi-coke production system for full-granularity low-rank coal rich / pure oxygen pyrolysis and two-stage waste heat efficient recovery. The anhydrous semi-coke production system comprises a raw material pretreatment unit, a rich / pure oxygen pyrolysis unit, a negative-pressure dissipated waste gas collection and backdraft unit, a waste heat recovery unit, a semi-coke discharging unit and a raw gas purification and coal tar recovery unit, the production process of the system comprises the following steps: 1, screening raw coal to obtain lump coal and pulverized coal, and pressing the pulverized coal into briquette coal; 2, carrying out medium-low temperature pyrolysis gasification on the lump coal and the briquette to produce semi-coke and raw coke oven gas; 3, negative pressure escaping waste gas is collected and subjected to backdraft; 4, recovering the waste heat of the semi-coke to generate saturated steam; 5, screening and discharging the semi-coke; and 6, purifying raw gas and recovering coal tar. According to the system, by arranging the raw material pretreatment unit, the negative-pressure dissipated waste gas collection and backdraft unit and the two-section type waste heat recovery unit, full-granularity low-order raw coal resource utilization is achieved, efficient production of high-quality anhydrous semi-coke, high-calorific-value raw coke oven gas and coal tar is achieved, and efficient gradient recovery of sensible heat of the semi-coke is achieved.