1254 results about "Gas heating" patented technology

The invention discloses a nuclear fusion superconducting coil heat treatment temperature control system and method. The temperature control system comprises a fuel gas heating control subsystem, an electric heating control subsystem, a wind speed control subsystem, a temperature acquisition subsystem and a temperature analysis feedback subsystem. The temperature control method comprises the following steps: performing an electric heating zoning temperature control process in a heat treatment temperature rise stage; and a gas heating and electric heating zoning cooperative temperature control process in the heat treatment heat preservation stage is carried out. According to the method, the power load peak value is remarkably reduced, and meanwhile, the method is suitable for the heat treatment scene of the nuclear fusion superconducting coil by dynamically distributing the power proportion of gas and electric heating; the actual temperature of each temperature control subarea of the heating furnace body and the superconducting coil is detected in real time and compared with the preset target temperature value of the corresponding process temperature curve in real time, the top layer is combined with stirring fan rotating speed dynamic adjustment and gas-electric power complementation, a closed-loop feedback chain from a local part to an overall part is formed, and the response speed and stability are effectively improved.

The invention discloses a shock wave heat loading high-temperature wind tunnel and a test method, and relates to the technical field of high-temperature wind tunnel test equipment. The shock wave heat loading high-temperature wind tunnel comprises a shock tube, a wind tunnel test system, a pressure acquisition system and an air intake and exhaust system; a high-temperature and high-pressure gas source is obtained in a secondary shock wave reflection heating mode, and the total temperature of the obtained heating gas source is higher; the high-temperature wind tunnel realizes gas heating and pressurization completely through shock wave flow, extra electric power and gas requirements are not needed, and the cost of a single test is lower; the high-temperature wind tunnel test gas is premixed, so that the components of the test gas can be accurately controlled, and the purity of the components of the test gas is ensured; the device can obtain a high-temperature high-pressure subsonic flow field and even a supersonic flow field covering wide-range working conditions, can be used for visualization test diagnosis of spray fuel atomization and spontaneous combustion processes under high-temperature crosswind, accurately characterizes physical and chemical characteristic parameters such as fuel atomization characteristics, self-ignition characteristics, flame propagation characteristics and the like, and has a wide application prospect. And test data support is provided for engine combustion chamber spray atomization combustion organization.

The invention discloses an analogue simulation system for operation of a ground source heat pump and a gas boiler in a severe cold area. The analogue simulation system comprises a heat supply correction model building module, a ground source / gas heat supply estimation module, a heat supply dispatching distribution module and a correction model optimization module. According to historical operation data of a ground source heat pump subsystem, heat supply correction models associated with soil geology and environmental climate are constructed based on a single variable principle, a heat supply amount estimated value of the ground source heat pump subsystem is dynamically corrected, heat supply amount of a gas boiler subsystem and heat load required by a building group are estimated, heat supply output of the two subsystems is intelligently distributed, and heat supply efficiency is improved. And the heat supply amount correction model is optimized through the actual heat supply amount deviation. The method can effectively overcome the problem of ground source heat pump heat supply amount deviation caused by soil heat unbalance and climate fluctuation in a severe cold area, further improves the energy efficiency estimation precision of a heat supply system, facilitates optimization of a scheduling strategy, has dynamic compensation and model self-evolution capabilities, and can adapt to complex environmental changes.

Swimming pool or spa gas heaters, cabinets, water header manifolds, and heat exchangers include: gas heaters having an air gap between a cabinet and combustion chamber to reduce heat transfer to sides of the cabinet; gas heaters having a user interface that is repositionable on a top panel; gas heater cabinets including a removable top panel that can be hung on a side panel; gas heaters having a built-in dual junction box; gas heaters having a top-accessible igniter and burner that are interlocked to maintain positioning thereof; adaptable water manifolds including connectable inlet and outlet fittings that adjust effective inlet and outlet positions; heat exchangers having a plurality of tube-and-fin subassemblies arranged in a semi-circular configuration; and water manifolds including internal cartridges that divide the water manifold into a plurality of chambers for improved circulation through a heat exchanger.

The invention discloses cooking equipment and a control method and a control device thereof, and relates to the technical field of kitchen appliances, the cooking equipment comprises a first shell, a heating assembly, a first fan and a humidifying assembly, the first shell comprises a cooking cavity; the heating assembly is configured to generate hot air flow through gas heating. The first fan is configured to drive the hot air flow to enter the cooking cavity; the humidifying assembly is used for adjusting the humidity of the hot air flow before entering the cooking cavity. The control method comprises the steps that a heating assembly and a first draught fan are controlled to operate, so that hot air flow is introduced into a cooking cavity; if it is determined that the cooking equipment operates in the wet baking mode, after the heating assembly and the first draught fan operate, the humidifying assembly is adjusted according to the baking information so as to control the humidity in the cooking cavity. According to the cooking equipment provided by the embodiment of the invention, the heating assembly and the humidifying assembly are arranged, and the humidifying assembly adjusts the humidity of the hot air flow before the hot air flow enters the cooking cavity, so that the humidity in the cooking cavity is adjustable.

The invention discloses a device and method for improving the laser welding quality of a large cylindrical battery tab, belongs to the technical field of new energy automobile battery welding, and aims to solve the problems of low material absorption rate, poor welding protection effect and the like in the prior art. The device comprises a fastening pressing block, the fastening pressing block fixes a battery cell and a collector plate, the fastening pressing block is provided with an internal gas passage, a blowing nozzle of the fastening pressing block is sequentially connected with a plasma activator, a gas heating device, a gas flow controller and a protective gas cylinder, and an exhaust nozzle of the fastening pressing block is connected with an exhaust device. Nitrogen blown out through the blowing nozzle sweeps over the surface of a to-be-welded area of the collector plate, a protective air curtain is formed in the to-be-welded area, the plasma activator conducts ionization activation on the nitrogen, formed nitrogen free radicals and the to-be-welded surface form a nitride layer in a chemical mode, and the laser absorption rate of the material can be remarkably improved. The reaction between the preheated workpiece surface and nitrogen free radicals can be accelerated, and a dual synergistic mechanism of physical preheating and chemical activation is formed.

The invention discloses cooking equipment which comprises a cooking device provided with a steam inlet; the steam device comprises a combustion chamber, a combustor and a water pipe, the combustor is arranged in the combustion chamber and is configured to be heated through fuel gas, at least one part of the water pipe is arranged in the combustion chamber and is matched with the combustion chamber in a heat exchange mode, and the water pipe is connected with the steam inlet so as to supply steam to the cooking equipment. According to the cooking equipment disclosed by the embodiment of the invention, the steam can be generated by heating the fuel gas, and the steam is provided for the cooking device, so that the cooking of the steam device is facilitated. Steam is generated through gas heating, the limitation of electric heating can be broken through, and the power of the steam device can be greatly improved.

The invention relates to the technical field of gas heating, in particular to a semiconductor special gas pipeline gas heating and heat preservation device which comprises a heat preservation shell, two sets of exhaust pipes fixedly communicate with the two opposite sides of the heat preservation shell in the length direction, and the two sets of exhaust pipes are arranged on the side face of the heat preservation shell up and down and incline relatively. The bottom of the heat preservation shell is fixedly connected with a base. And the heat conduction mechanism comprises a protective shell arranged in the heat preservation shell, heat insulation frames are fixedly connected to the four corners of the inner wall of the protective shell, a gap is formed between every two adjacent heat insulation frames, and the two sides, away from the protective shell, of the heat insulation frames jointly form an inner arc face. Through the drainage assembly and the airflow stirring assembly in the heat conduction mechanism, the transferred unstable hot airflow can be converted into uniform heat, so that gas conveyed in the gas pipe is heated, uniform heating is achieved, the local temperature problem is avoided, high-quality completion of processes such as chemical vapor deposition is guaranteed, and the manufacturing quality and the yield of chips are improved.

The invention discloses a measurement and control system of gas heating equipment, which relates to the technical field of equipment measurement and control, and is characterized in that a flow feed-forward control module is used for determining a target mass flow value through a feed-forward compensation processing mechanism according to at least one parameter measured by a sensor measurement module; the temperature control module is used for determining PID control parameters of a cascade PID control structure comprising a main loop and an auxiliary loop according to the temperature parameters measured by the sensor measurement module and a preset temperature difference grading fuzzy PID control rule; and the power control module is used for determining the target heating power according to the target heating rate and the characteristic parameters of the rear-end purging object, and adjusting the heating power of the heater in combination with an anti-integral saturation mechanism configured by the temperature control module and the power control module. By adopting the system, the heating process can be accurately adjusted and quickly responded, and the temperature control stability and the equipment operation efficiency are improved.

The utility model relates to the field of household appliances, and discloses a condensation heat exchanger, a condensation heat exchange system and a water heater. According to the condensation heat exchanger, the condensation heat exchange system and the water heater, the heat efficiency of a conventional gas water heater can be improved, installation is convenient and fast, the improvement cost is low, and normal use of gas heating equipment is not affected. The condensing heat exchanger comprises a body, a heat exchange mechanism, a connecting mechanism and a smoke guide mechanism, a body smoke inlet is formed in the bottom of the body, and a body smoke outlet is formed in the top of the body; the heat exchange mechanism and the smoke guide mechanism are arranged in the body, and the heat exchange mechanism is used for conducting heat exchange on a cold medium circulating in the heat exchange mechanism; the connecting mechanism is arranged at the body smoke inlet, and the body smoke inlet is detachably connected with an outlet of a smoke discharging mechanism of the gas heating device in a sealed mode through the connecting mechanism. The smoke guide mechanism is located between the body smoke inlet and the body smoke outlet and used for changing the flowing direction of smoke in the body, prolonging the convection path of high-temperature smoke and improving the heat exchange efficiency.

The invention provides a CFB (circulating fluid bed) boiler for heating molten salt by sucking smoke in a tail flue, and belongs to the technical field of CFB boilers coupled with molten salt heat storage. The problem that the scale and efficiency improvement of industrial production are seriously limited due to the fact that a traditional CFB boiler unit is generally lack of high-capacity and high-parameter industrial gas supply capacity is solved. The system comprises a hearth, a separating and returning system and a tail flue, the separating and returning system comprises a cyclone separator, and a low-temperature superheater high-temperature section, a low-temperature superheater low-temperature section, a high-temperature economizer, an SCR device, a low-temperature economizer and an air preheater are sequentially arranged in the tail flue in the flowing direction. A high-temperature flue gas leading-out pipeline is arranged between the low-temperature superheater high-temperature section and the low-temperature superheater low-temperature section, a low-temperature flue gas leading-out pipeline is arranged between the high-temperature economizer and the SCR device, and the outlet end of the high-temperature flue gas leading-out pipeline and the outlet end of the low-temperature flue gas leading-out pipeline are both connected with the inlet end of the mixer. The device is mainly used for the CFB boiler unit.

Devices, systems, and methods for controlling a temperature within an interior space of a building, and modifying a pre-existing temperature control system by replacing a gas heater with a heat pump. In one embodiment, a temperature control system includes a cooling unit, a heat pump, and ductwork connecting the cooling unit and the heat pump. In one embodiment, a method of operating a temperature control system includes providing to an interior space of a building heated air with a heat pump, providing cooled air with the heat pump, and providing dehumidified air with the heat pump. The method may further include providing supplemental cool air to the interior with the heat pump. In one embodiment, a method of modifying or retrofitting a pre-existing temperature control system includes replacing a pre-existing gas heater with a heat pump, while retaining a cooling unit and ductwork of the pre-existing system.

The invention discloses a portable fuel gas heating device, and relates to the technical field of heating equipment, a gas inlet header pipe can introduce fuel gas to a flameout protection module and a main burner system under the control of a main valve, and the main burner system comprises a nozzle and a profiling furnace end which can be firmly installed in a body frame. The body frame protects the profiling furnace end in the circumferential direction, at least one side wall of the body frame is provided with a side interlayer cavity, the upper top of the body frame is provided with a top interlayer cavity, the lower end of the side interlayer cavity and an exhaust port of the top interlayer cavity are communicated with the outside, and the side interlayer cavity is communicated with the top interlayer cavity. The temperature sensor transmits a signal to the main valve, the main valve controls the gas inlet header pipe to supply gas to the main burner system, flames on the soft fire burner system ignite gas overflowing from the surface of the profiling furnace end, and the anti-toppling switch can send a signal to the main valve to stop supply of all gas when detecting that the body frame topples. According to the invention, the use safety can be improved, and the carrying is convenient.

The invention relates to the field of transformers, in particular to a no-load current adjustable transformer which comprises an adjustable transformer body, the adjustable transformer body comprises a shell, a partition plate is fixedly connected to the lower portion in the shell, a bottom bin is arranged on the lower portion of the partition plate, and side bins are fixedly connected to the middles of the two sides in the shell. The device comprises a shell, air heating cavities are formed in the two sides of the shell, guide pipes are fixedly connected to the front side and the rear side of the top of each air heating cavity, the ends, away from the air heating cavities, of the guide pipes penetrate through the side wall of the shell, the ends, away from the air heating cavities, of the guide pipes penetrate through the tops of side bins, piston plates are slidably connected into the side bins, and limiting rods penetrate through the front portions and the rear portions of the piston plates. According to the adjustable transformer, the situation that the safety performance of the adjustable transformer is affected due to the fact that the temperature of insulating oil is accumulated and rises to exceed a safety threshold value can be effectively avoided, and the safety of the transformer is effectively improved.

The utility model provides a drying device of high water content low rank coal, it includes fixed fluidized bed, roll screen and heat source device, fixed fluidized bed includes shell, air distribution plate, gas heating subassembly and main fan, shell inner cavity is equipped with air distribution plate, air distribution plate divides shell inner cavity from top to bottom into drying chamber and gas chamber, and the drying chamber is equipped with the main fan. The roller screen is located in the drying chamber and arranged above the air distribution plate at intervals. The shell is provided with a feed port and a discharge port which are respectively communicated with the drying chamber, the feed port and the discharge port are arranged at an interval along the length direction of the shell, the feed port is positioned at the front end of the air distribution plate and positioned above the roller screen, and the discharge port is positioned at the tail end of the air distribution plate; the gas heating assembly, the main fan and the gas chamber are sequentially connected, and the heat source device is used for heating a screen shaft of the roller screen and a screen plate connected with the screen shaft. According to the utility model, materials with different particle sizes are separately dried, and meanwhile, oversize materials and undersize materials are synchronously dried, so that the drying efficiency is improved, and the coal quality is improved.

The present invention provides a chemical vapor deposition apparatus. Gas heating and feeding devices are arranged at the top of a process chamber, the gas heating and feeding devices supply hot gas to the position above carrying areas of a carrying device, and the hot gas assists in heating laminar flow ejected from a process gas feeding device, so that the temperature difference between the upper surfaces and the lower surfaces of substrates in the carrying areas is reduced, and the formation of deposits on the ceiling of the process chamber is suppressed. In addition, the hot gas can also suppress diffusion of laminar-flow process gas away from the substrates, thereby concentrating the process gas near the surfaces of the substrates to enhance film formation on the surfaces of the substrates.

The utility model provides a fixed fluidized perturbation bed drying system, the device comprises a fixed fluidized bed, a roller screen and a heat source device, the fixed fluidized bed comprises a shell, an air distribution plate, a gas heating assembly and a main fan, the air distribution plate is arranged in an inner cavity of the shell and divides the inner cavity of the shell into a drying chamber and a gas chamber from top to bottom, and the drying chamber and the gas chamber are arranged in the drying chamber. The roller screen is located in the drying chamber and arranged above the air distribution plate at intervals. The shell is provided with a feed port and a discharge port which are respectively communicated with the drying chamber, the feed port and the discharge port are arranged at an interval along the length direction of the shell, the feed port is positioned at the front end of the air distribution plate and positioned above the roller screen, and the discharge port is positioned at the tail end of the air distribution plate; the gas heating assembly, the main fan and the gas chamber are sequentially connected, and the heat source device is used for heating a screen shaft of the roller screen and a screen plate connected with the screen shaft. According to the utility model, materials with different particle sizes are separately dried, and meanwhile, oversize materials and undersize materials are synchronously dried, so that the drying efficiency is improved, and the coal quality is improved.

The invention relates to a molten salt groove type heat collecting device, an operation method of the molten salt groove type heat collecting device and a molten salt groove type photo-thermal power station, and belongs to the field of molten salt groove type photo-thermal power stations. The heat collection mechanism comprises a plurality of heat collectors which are connected in series through pipelines to form a heat collector group, and the two ends of the heat collector group are communicated to the molten salt tank; the heat collector set is arranged in a U shape, a pipeline at the bottom of the U shape is a middle jumper pipe, and the middle jumper pipe is located at the highest position. And a gas outlet of the gas heating mechanism is communicated with the middle jumper pipe. The two ends of the U-shaped heat collector set are communicated with the fused salt tank, the highest position of the heat collector set is communicated with the gas heating mechanism, heating and salt injection can be conveniently conducted on the heat collectors, the automation degree is high, and convenience and rapidness are achieved.

The invention relates to a double-station turbine blade thermal shock test device and a test method thereof, and the device comprises a flame gas heating system which is used for generating high-temperature flame through gas combustion to simulate transient thermal shock when an aero-engine is started; the double-station pushing platform comprises a frame, a front testing station and two rear independent testing stations, wherein the front testing station and the two rear independent testing stations are installed on the frame. The airflow cooling system is used for quickly cooling the high-temperature test piece; the infrared temperature measuring device is used for detecting the surface temperature of the blade in real time and feeding back the surface temperature to the flame gas heating system to realize closed-loop temperature control; the image acquisition device is used for acquiring appearance characteristic data of cracks on the surface of the blade in the test process; and a base. Compared with the prior art, the device has the advantages that the device has remarkable advantages in the aspects of test function integrity, working condition simulation accuracy, test efficiency and the like, and comprehensive test support can be provided for research and development of aero-engine hot end components.

The utility model relates to the technical field of coke oven heating, in particular to a mixed gas heating single-hole combustion chamber temperature adjusting system which comprises adjusting units, one end of each adjusting unit is connected with a mixed heating gas main pipe, and the other end of each adjusting unit is connected with a corresponding waste gas shutter. And the mixed coal gas sequentially passes through the mixed heating coal gas main pipe, the corresponding adjusting unit, the corresponding waste gas opening and closing device and the corresponding heat storage chamber to enter the corresponding combustion chamber. The utility model has the advantages that: the original gas heating pipeline is improved, and the regulating valve is connected with the gas heating pipeline in parallel on the basis of not changing equipment (the equipment comprises the regulating cock, the pore plate box and the exchange cock) on the gas heating pipeline, so that the independence of manual regulation is ensured, and the gas heating pipeline is convenient to use. The furnace temperature adjusting effect of each combustion chamber during mixed gas heating is improved; and various pore plates with different diameters are arranged in the pore plate box, so that the requirement of manual adjustment can be met.

The invention relates to a flameout control method, system and equipment for a gas heating water heater and a medium. The gas heating water heater comprises a sealed combustion system, a Venturi mixer and a pneumatic gas valve which are sequentially communicated, and a command valve of the pneumatic gas valve is connected to an air purification bin of the sealed combustion system through an air pressure pipe. The method comprises the following steps: in a whole machine debugging stage, setting the pressure of a zero-position adjusting spring of a command valve of the pneumatic gas valve to be a negative value; in the operation stage of the water heater, whether the combustion flame is out of flame or not is determined based on the ratio of the gas flow to the air flow; the pneumatic gas valve is closed by the controller in response to a combustion flame off-flame stall. When the smoke pipe is seriously blocked, the pneumatic gas valve can be closed, so that the whole machine is shut down, and the gas heating water heater is protected.

The utility model relates to the technical field of coke oven heating, in particular to an economical single-hole combustion chamber temperature adjusting device, which is characterized in that the input end of each heating gas unit I and the input end of each heating gas unit II are respectively connected with a heating gas main pipe; the output end of each first coal gas heating unit and the output end of each second coal gas heating unit are connected with the corresponding combustion chamber, one end of each adjusting unit is connected with the corresponding first coal gas heating unit, and the other end of each adjusting unit is connected with the corresponding second coal gas heating unit. The utility model has the advantages that the structure realizes the communication of the two heating gas main pipes, one regulating valve can be adopted to complete the flow regulation of the two gas heating pipes in the same combustion chamber, and the on-line maintenance and manual regulation are realized by changing the opening position of the T-shaped plug valve; the regulating valve is connected with the stop valve through the three-way connector, it is guaranteed that the regulating valve can be detached at any time when breaking down, and normal production is not affected.

The invention discloses an intelligent control system for an energy-saving continuous up-casting furnace based on machine learning, and particularly relates to the technical field of artificial intelligence, which comprises a data acquisition and processing module, an intelligent control module, a composite heating module, a waste heat recovery module and a safety monitoring and protection module, the data acquisition and processing module is used for acquiring, processing and storing data of temperature, flow velocity, pressure and gas components into a database, the intelligent control module is used for dynamically adjusting heating power and traction speed, generating a control instruction and sending the control instruction to the composite heating module, and the composite heating module is used for controlling the traction speed according to the instruction of the intelligent control module. The resistance heating module is used for distributing the proportion of resistance heating and fuel gas heating, the waste heat recovery module is used for recovering waste gas waste heat of a furnace body, driving an ORC power generation unit through the waste heat and converting the waste heat into electric energy, and the safety monitoring and protecting module is used for configuring multiple sensor networks in key links of the casting furnace and monitoring the safe operation state.

The utility model belongs to the field of heat insulation detection, and particularly relates to a device for measuring a heat insulation effect. Comprising a gas source, a gas heating device and a tubular furnace which are sequentially connected through a pipeline, the output end of the tubular furnace is connected with the external environment, and a multifunctional recorder is further arranged in an inner cavity of the tubular furnace; a temperature measurer, a temperature controller and a first thermocouple are arranged in the gas heating device, the output end of the gas source is connected with the input end of the temperature controller, and the output end of the temperature controller is connected with the input end of the tubular furnace; the output end of the first thermocouple is connected with the temperature measurer, and the measuring end is located in the temperature controller; by heating the gas, the temperature difference between the inner and outer surfaces of the tubular sample can be ensured, and the tubular sample is prevented from being damaged due to temperature difference caused by overlarge temperature difference between the inner and outer surfaces. By arranging a fourth thermocouple and a fifth thermocouple, it is determined that the temperature of the input gas is more stable.

A gas heating section and reforming section are provided in which flue gas is used as an anode (oxygen) purge gas in an electrolysis unit. The resulting combined gas stream is fed as a combustion gas stream to the gas heating / reforming section. By continuously feeding the combined gas stream to the at least one combustor and combusting, a flue gas stream with high purity CO2 can be obtained. The invention also provides a chemical plant, and a method for providing a syngas stream.

The utility model provides a roll shaft type V-shaped gas heating furnace, and belongs to the technical field of gas heating furnaces. The roller shaft type V-shaped gas heating furnace comprises a furnace body, a transmission roller, a supporting beam, a gas pipe, a first supporting base, an air pipe, a waste gas pipe, a first radiant tube, a first air valve, a first combustor, a second radiant tube, a second air valve and a second combustor. The two first radiant tubes are arranged above to heat workpieces placed on the multiple transmission rollers, and the second radiant tubes are arranged below to heat the workpieces placed on the multiple transmission rollers, so that all-directional heating of the workpieces is achieved, the workpieces reach the preset temperature within the shortest time, and the heating efficiency of the workpieces is improved. And the working efficiency of the product is improved. When the thickness of the workpiece is large, the workpiece is heated from the upper direction and the lower direction through the first radiant tube and the second radiant tube, so that the upper portion and the lower portion of the workpiece are prevented from being heated unevenly, the heat treatment effect on the workpiece is improved, and the machining quality of products is improved.

The invention discloses a high-temperature stable gas heat conduction temperature control method and system, and relates to the technical field of temperature control. The system comprises a high-temperature inert gas loop, a gas circulation driving module, a gas heating module, a gas heat exchange module, a gas cooling module, a gas purification and supplement module and a precise temperature sensing and control module. The high-temperature inert gas loop is configured as a closed circulation path and is used for bearing high-purity inert gas as a heat carrier; and the gas circulation driving module is arranged in the high-temperature inert gas loop and is used for driving the high-purity inert gas to continuously and circularly flow in the closed circulation path. By adopting high-purity inert gas as a heat-conducting medium and combining precise circulation driving, multi-stage heating, efficient heat exchange, active cooling, online purification and intelligent control technologies, the problems that an existing liquid heat-conducting medium is unstable in phase change at a high temperature, a metal eutectic medium is poor in safety, and a composite system is high in complexity are solved.

The utility model relates to the technical field of annealing furnace equipment, and provides a heating device of a galvanized strip steel annealing furnace, which comprises a furnace body and a cooling cavity, the cooling cavity is arranged in the furnace body, a conveying roller is mounted in the furnace body, a first motor is mounted on the side surface of the furnace body, and the output end of the first motor is connected with the conveying roller. The fuel gas heating assembly is arranged inside the furnace body, the cooling return air preheating assembly is arranged outside the furnace body and comprises a negative pressure fan, the negative pressure fan is installed at the top of the cooling cavity, a pair of gas cavity plates is arranged in the furnace body, the gas cavity plates are communicated with each other, and a constant-temperature cavity is formed in the furnace body. According to the technical scheme, the problems that in the prior art, a preheating mode of an existing annealing furnace is large in energy consumption, in the annealing treatment process, gas used for cooling is directly discharged, a heat source cannot be recycled, energy consumption is large, and the influence on the surrounding ring is large are solved.

The water inlet valve assembly comprises a valve body, the valve body is provided with a water inlet flow channel, a middle flow channel and a water supplementing flow channel, the middle flow channel is communicated with the water inlet flow channel, the other end of the middle flow channel is communicated with the water supplementing flow channel through a water supplementing opening, and a connector is arranged at the other end of the middle flow channel; the connecting piece is connected with the joint; the water replenishing pressure relief rod penetrates through the connecting piece and extends into the middle flow channel; a flow guide channel is formed in the end face of the first end, a pressure relief cavity communicated with the flow guide channel is formed in the end face of the second end, and a pressure relief assembly is arranged in the pressure relief cavity and used for opening or blocking the flow guide channel. The valve body, the connecting piece and the water replenishing pressure relief rod are arranged, the valve body is provided with the water inlet flow channel, the middle flow channel and the water replenishing flow channel, the movable water replenishing pressure relief rod can open or block the water replenishing port, and the water inlet valve assembly integrates the function of replenishing water to a heating pipeline system; the pressure relief assembly can open or block the flow guide channel, so that the gas heating water heater can operate safely.

The present invention provides a dual-action serial circulation high-purity aluminum melt low-pressure casting device and preparation method. The present invention can complete the purification and fine-graining preparation of aluminum alloy melt in a gas-fired heating furnace, and realize the low-pressure casting of complex structural metal products in a low-pressure casting furnace. The gas-fired heating furnace and the low-pressure casting furnace do not need to be mechanically transferred. By monitoring the melt level and opening and closing the automatic angle meter and the double-furnace stop plugs, the gas-fired heating furnace can dynamically replenish the aluminum alloy melt in the low-pressure casting furnace. This dynamic replenishment causes little fluctuation in the surface of the aluminum alloy melt in the low-pressure casting furnace, and does not generate significant turbulence, air entrainment, or slag inclusions. At the same time, the replenished aluminum alloy melt is of high quality and contains less oxidized slag inclusions, greatly improving the metallurgical quality of the melt.