1144 results about "Air blast" patented technology

The invention relates to the field of coal mine exhaust control, in particular to a coal mine exhaust control method and device based on environmental perception. The method comprises the following steps: acquiring multi-dimensional monitoring signals based on environment sensing sensors at multiple positions of a mine, performing distributed sensing marking, and constructing a global gas concentration sensing graph; the method comprises the following steps: acquiring position information of operating personnel in real time based on a miner positioning sensor, performing short-time movement prediction on the operating personnel, and generating a miner movement prediction path; obtaining a coal mine internal structure chart, and carrying out average oxygen consumption rate budget and instantaneous oxygen supply demand calculation based on the miner movement prediction path to obtain oxygen supply demand indexes of each unit; and according to the oxygen supply demand index of each unit, intelligent exhaust power calculation adjustment is carried out, and a conventional exhaust control strategy is constructed. Ventilation efficiency of the coal mine area is improved, emergency blast treatment is carried out under the risk condition, the risk problem response capacity is greatly improved, and safety of the coal mine area is enhanced.

A vehicle control system and method based on an air flow rate, control introduction of outside air based on an estimated driving current value of a blowing device, obtained through a current model preset based on a calm wind state, and an estimated air flow rate value of an inlet, obtained through an air flow rate model preset based on an outside wind state.

The invention relates to an intelligent aeration system and a control method, and belongs to the technical field of sewage treatment. The system comprises a clean water tank, an aeration tank, a data acquisition unit, a PLC control unit and an aeration unit. The system dynamically calculates the required DO set value by collecting the inlet water chemical oxygen demand, the clear water ammonia nitrogen concentration, the sludge concentration and the sewage temperature of sewage in real time, calculates the difference value between the actual DO value and the required DO set value, calculates the aeration amount needing to be adjusted, and finally adjusts the blast volume through the aeration unit. The problems that a traditional aeration system is high in energy consumption and low in control precision are solved, insufficient aeration or excessive aeration can be effectively avoided, and stable effluent quality is guaranteed.

The utility model discloses a fire extinguishing bag gas circuit filling mechanism for an aviation fire extinguishing water tank, which comprises a blast unit, a feeding unit, a hatch unit, a feeding unit, a dragging unit and a sealing pull ring component unit, and the blast unit, the feeding unit, the hatch unit and the feeding unit are sequentially abutted and fixedly connected. One end of the dragging unit is detachably connected with the feeding unit, the other end of the dragging unit is fastened with the sealing pull ring assembly unit, the air blowing unit and the feeding unit are installed on the outer side of the top of the water tank, the hatch unit, the feeding unit and the dragging unit are located in the water tank, and the sealing pull ring assembly unit is located on the outer side of the water tank. The mechanism solves the problems that in the prior art, when an aviation fire extinguishing water tank is filled with fire extinguishing bags, the filling efficiency is low, the fire extinguishing bags are unsmooth to convey, and a hose is unsmooth to move.

The utility model relates to the technical field of waste heat recycling, and particularly discloses a waste heat recycling device of a sintering circular cooler, which comprises a dust removal structure and a heat exchange structure connected with the dust removal structure, and the dust removal structure comprises a primary cyclone dust removal assembly and a secondary cyclone dust removal assembly communicated with the top of the primary cyclone dust removal assembly. An air blowing assembly is arranged at the top of the secondary cyclone dust removal assembly; the heat exchange structure comprises a supporting frame, a first heat exchange tank and a second heat exchange tank, wherein the first heat exchange tank and the second heat exchange tank are horizontally installed on the supporting frame. Heat exchange pipe sets are arranged in the first heat exchange tank and the second heat exchange tank. The sintering circular cooler waste heat recovery device achieves efficient dust removal and waste heat recovery of high-temperature waste gas, has the advantages of being simple in structure, convenient to maintain, high in heat exchange efficiency and the like, and is suitable for the field of sintering circular cooler waste heat recovery in steel smelting and other industries.

The invention relates to the technical field of display screen engraving, in particular to display screen machining and engraving equipment which comprises a machining box body and a laser engraving machine, a transverse displacement mechanism for moving a display screen is arranged at the top of the machining box body, and a base block is arranged at the top of the transverse displacement mechanism; a base block is arranged on the moving frame, a fixing frame for carving and positioning a display screen is movably arranged on the top of the base block, an inclined material overturning assembly for overturning and cleaning the fixing frame is arranged on the base block, and a blast discharging assembly for cleaning the top of the fixing frame is arranged on the moving frame. Machining scraps originally attached to or accumulated on the top and the peripheral edge of the display screen are effectively stripped under the action of gravity, a cleaning spray head in the air blowing discharging assembly is used for stripping, guiding airflow pointing to a containing hole is formed, and the stripped scraps and dust are separated from the display screen under the combined action of airflow coercing and gravity. And the air is efficiently and directionally purged and guided into the accommodating hole.

According to the furnace top heat supply type annular roasting system, the annular working face is adopted, the cooling section is divided into four sections, hot air from the furnace hoods flows to the four process sections, hot air generated by the furnace hoods of the first cooling section and the second cooling section is used for pellet roasting after being heated in a pipeline, hot air generated by the furnace hoods of the third cooling section and the fourth cooling section is used for preheating and forced air drying of pellets, and therefore the pellet roasting efficiency is improved. By means of the arrangement, hot air utilization is more sufficient and reasonable, energy is saved, heat distribution is even, and pellet underfiring and overfiring are prevented. The preheating section and the roasting section adopt a furnace cover top air supply technology, so that bias flow of hot air in a furnace cover is reduced, and the technology is a guarantee for uniform roasting of pellets. Drying, preheating, roasting and cooling processes of the pellets are all completed on one device, and operation is easy. And compared with a belt type roasting machine, trolleys are reduced by half, and the investment is relatively low. The system has the characteristics of small occupied area, uniformity in pellet roasting and low investment cost, and is suitable for medium and small-scale production. The invention further provides a process method of the furnace top heat supply type annular roasting system.

The application discloses a belt roaster with staged utilization of hot air in a staged cooling process, comprising: a blast drying section, an exhaust drying section, a preheating section, a roasting section, a soaking section, a first cooling section, a second cooling section and a third cooling section in sequence along the direction of material flow; wherein the hot air generated by the first cooling section, the second cooling section and the third cooling section has a temperature of not less than 1100 DEG C, 600-800 DEG C and not more than 300 DEG C respectively, and the hot air is delivered to the roasting section, the preheating section and the blast drying section through pipelines respectively. The application can fully recover high-temperature waste gas, the hot air with different temperatures is applied to suitable process sections, the energy utilization rate is improved, and low-calorific-value fuel can be used while reducing process energy consumption by combining gas preheating or oxygen-enriched primary air / full-oxygen combustion.

The invention relates to the technical field of sewage treatment, and discloses an environment-friendly aeration device and method for chemical sewage treatment. The device comprises a conveying module used for detecting chemical oxygen demand and sludge concentration and calculating target dissolved oxygen concentration and initial aeration control parameters; the driving module is used for calculating the aeration depth and driving the aeration bracket to lift and rotate to perform sweeping type aeration; the control module is used for processing the dissolved oxygen deviation and the deviation change rate through a fuzzy reasoning algorithm to obtain a controller parameter adjustment amount; the blowing module is used for updating controller parameters and adjusting the rotating speed of a blower to output total air supply; and the adjusting module is used for calculating a gas distribution coefficient and adjusting the opening degree of each branch pipe valve to distribute the total gas supply. The adaptive capacity of the aeration device to water quality fluctuation and the dissolved oxygen concentration control precision are improved, the energy consumption of the air blower is reduced, and the aeration uniformity of each area is improved.

The invention relates to the related technical field of welding, in particular to a welding tool for electronic device manufacturing, which comprises a processing box body, a welding machine and a welding gun, the top of the processing box body is fixedly provided with a base cylinder, the top of the base cylinder is provided with a folding positioning assembly, and the folding positioning assembly is used for surrounding, centering and positioning a circular circuit board; the folding positioning assembly comprises a rotating disc and arc-shaped guide columns, the four arc-shaped guide columns conduct flexible centering clamping on the circular circuit board synchronously in the radial direction, the rotating disc is provided with a surrounding sweeping assembly, and the surrounding sweeping assembly conducts sweeping, blowing and cleaning on the top of the circular circuit board. Through linkage operation of the surrounding sweeping assembly and the folding positioning assembly, thorough cleaning of the surface of a circuit board is completed while clamping is conducted, the coverage area of fan-shaped swing air blowing is large, no dead angle exists, the risk of poor welding caused by pollutants is remarkably reduced, the swing dust collection assembly dynamically swings in the welding process, a welding gun heat source is tightly tracked, and the welding efficiency is improved. And harmful gas and smoke dust are efficiently captured.

1. The name of the design product: towed air-blast sprayer (II). 2. The use of the design product: for spraying water mist or pesticide mist. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1. 5. The bottom view of the design product is the part that is not easy to see or cannot be seen when in use, so the bottom view is omitted.

The application discloses a kind of baking food blast drying oven, it is related to food drying technical field, including drying oven shell, the tank of being installed in the inside of drying oven shell, be set in the left and right sides of tank and be fixed in the bottom tank of tank lower end, the inside of drying oven shell is at least installed with two around wind channel structure from top to bottom, the top of tank is installed with and the air inlet of around wind channel structure is connected electric heating air blowing component, the left and right sides of tank bottom are respectively provided with the disc type shelf that can rotate around its own axis, the inside of bottom tank is installed with and the magnetic key shaft connection component of selectively power connection of disc type shelf is carried out.The application makes baked goods rotate around the axis of disc type shelf, and follow dynamic air duct structure rotation air supply, while variable speed adjusting assembly provides power for side inner air blowing component, forms inner circulation air area at tank inner wall, realizes the position dynamic change of baked goods in drying process and the optimization of air flow field.

The invention discloses a desert air condensation water production system utilizing wind and light residual electricity, relates to the technical field of air condensation water production, and particularly comprises a wind and light residual electricity recovery unit, a blast unit, a hot water pumping unit, a cold water pumping unit and an air condensation water production unit, the wind-light residual electricity recycling unit is used for converting wind-light residual electricity into heat energy and cold energy in time, and adopts a double-path storage design, hot water is stored in the heat storage water tank, and cold water is stored in the cold storage water tank; the air condensation water production unit comprises a plurality of moisture absorption units and condensation units, and moisture absorption materials are arranged in the moisture absorption units. The environment characteristic that the night humidity of the desert area is remarkably increased is fully utilized, and through the collaborative dehumidification strategy of active dehumidification and passive temperature difference dehumidification, the energy consumption of the system is reduced, meanwhile, the desert air condensation water production efficiency is improved, residual electricity which cannot enter a power grid is effectively utilized, and the problem of water shortage of a wind and light power generation area is solved.

The invention discloses a calf breeding device and method for cattle breeding, and relates to the technical field of calf breeding, the calf breeding device comprises a foundation plate, a breeding cage is fixedly arranged on the foundation plate, a water tank and a trough are arranged in the breeding cage, a door body is arranged on the side face of the breeding cage, and side plates are fixed to the front side and the rear side of the top of the foundation plate; a breeding platform is mounted between the side plates; a back plate is fixed to the right side of the breeding cage, and an air blowing assembly is installed on the back plate. A gap is reserved between the lower portion of the back plate and the breeding platform, and a pollution discharge assembly corresponding to the breeding platform is installed on the right side of the top of the foundation plate. Safe protection can be provided for calves, proper temperature is provided for the interior of the breeding cage through the air blowing assembly and the fence protection assembly, so that breeding of the calves is facilitated, in addition, excrement can be conveniently cleaned through cooperation of the movable conveying belt in the breeding platform and the pollution discharge assembly, and cleanliness and sanitation are guaranteed.

The application provides a wind power generation equipment and belongs to the technical field of wind power generation. The wind power generation equipment comprises a blowing part, a connecting seat connected with the blowing part, and an adjusting mechanism located in the connecting seat. The adjusting mechanism comprises a driving assembly, at least one connecting disc connected with the driving assembly, and balls arranged on the connecting disc. The connecting disc is driven to rotate in the connecting seat by the driving assembly, and the balls are used to reduce the friction during rotation, so that the windward angle of the blowing part is adjusted. The angle of the blowing part can be adjusted according to the wind direction, so that the wind power generation equipment is always in the direction of the wind direction, and the utilization efficiency of wind energy is further improved.

The invention provides a power transmission tower and wire safety assessment method and system under the action of avalanche-blast, and belongs to the technical field of power transmission engineering. A power transmission tower is equivalent to a multi-degree-of-freedom cantilever beam structure, a wire is equivalent to a catenary structure, and two working conditions of direct disaster of the power transmission tower and disaster of the wire are divided according to a spatial relationship between an avalanche core and an impact blast and a power transmission system; on the basis of power parameters obtained through avalanche-blast motion simulation, under the working condition that the power transmission tower is directly affected, the power parameters serve as loads to be applied to the power transmission tower model for power response analysis so as to evaluate safety; and under the working condition that the lead is affected, applying the lead as excitation to a lead model to solve lead response and tension, and transmitting the tension to the tower body to evaluate the overall safety of the tower line. According to the invention, comprehensive evaluation of the safety state of the power transmission system under the action of avalanche-blast is realized, and technical support is provided for planning, design and protection of a power transmission line in an avalanche-prone area.

The application relates to a film blowing equipment technology, in particular to a film blowing machine capable of improving the thickness uniformity of products, which comprises a rack, a feeding cylinder connected to the rack, an extrusion mechanism communicated with the feeding cylinder, a blowing assembly connected to the rack, a die head assembly connected to the extrusion mechanism and a correction mechanism connected to the rack, the correction mechanism comprises an air outlet assembly communicated with the blowing assembly, and the air outlet assembly is rotationally connected to the rack. The application has the advantage of improving the thickness uniformity of products.

The utility model provides an automatic air-drying device which comprises an air-drying machine box, a conveying belt assembly and a tray, the tray is used for loading objects to be air-dried and then is arranged on a bearing face of the conveying belt assembly, the conveying belt assembly penetrates through an inner cavity of the air-drying machine box, and a plurality of blower devices with working faces facing the bearing face of the conveying belt assembly are arranged in the air-drying machine box. A plurality of ventilation holes are formed in the bearing face of the conveying belt assembly and the inner bottom face of the tray. According to the automatic air drying device, the trays and neodymium iron boron products are driven by the conveying belt assembly to enter the inner cavity of the air drying machine box, the neodymium iron boron products are dried through the blower device, and the drying mode that the products are wiped manually is replaced; and after being blown to the neodymium-iron-boron product, the airflow can continuously flow in the original flow direction directly through the ventilation holes in the conveying belt assembly and the tray, so that the airflow can be conveniently carried to move and leave the surface of the neodymium-iron-boron product through the ventilation holes.

The utility model discloses neodymium-iron-boron magnet sintering and cooling equipment, which belongs to the technical field of neodymium-iron-boron preparation and comprises a furnace body, a conical sleeve is fixedly arranged at a first end of the furnace body, an air inlet communicated with the furnace body is axially arranged on the conical sleeve, and the air inlet is hermetically connected with a driving mechanism through a first pipeline. The output end of the driving mechanism is fixedly connected with a conical plate matched with the conical sleeve through a connecting shaft, the connecting shaft is slidably arranged in the air inlet, the diameter of the connecting shaft is smaller than that of the air inlet, the first pipeline is connected with a cooling mechanism through a pipeline, and the cooling mechanism is connected with an air blowing mechanism through a pipeline. And the blast mechanism is hermetically connected with the air outlet at the second end of the furnace body through a pipeline. Through the arrangement of the conical plate, cooling gas blown into the furnace body diffuses and is blown into the neodymium iron boron product in the circumferential direction, the phenomenon that the product and the cooling gas are fractured due to huge temperature difference caused by direct blowing of the cooling gas is avoided, and the uniformity of the cooling gas entering the furnace body is improved.

The invention belongs to the technical field of environmental protection, and particularly relates to a direct-fired incinerator based on environmental protection, which comprises a transfer component, and a feeding component is arranged at the top of the transfer component; the top of the incinerator is provided with an adapter sleeve box; the exhaust component is arranged at the bottom of the transfer component and is used for exhausting internal dried water vapor; the transfer part comprises a container, and transfer cutting grooves are formed in the left side and the right side of an inner cavity of the container. According to the device, most of water in collected garbage can be removed through an air blowing plate, then the garbage is subjected to fine drying treatment through an upper dryer, and at the moment, the garbage can be flatly laid on the upper surface of a built-in transmission belt under the vibration effect of an internal vibration component; therefore, the problem that residual water in the stacked garbage cannot be dried is solved, the garbage subsequently thrown into the incinerator is ensured to be in a relatively dry state, and the problem that the garbage cannot be fully combusted due to water interference is avoided.

The utility model provides a smoking machine. The smoking machine comprises a main machine, a tobacco pipe and a base, the main machine comprises a shell, the shell comprises an outer shell and a bottom cover, the outer shell is provided with a mounting cavity, the bottom cover is connected with the side, close to the base, of the outer shell, and an air inlet is formed in the bottom cover; the heat insulation cover is connected with the bottom cover, and an air inlet is formed in the heat insulation cover; the automatic igniter is arranged in the mounting cavity and connected with the bottom cover, the automatic igniter comprises an ignition needle, the ignition needle penetrates through the bottom cover to be contained in the air inlet, a gap is formed between the ignition needle and the side wall of the air inlet, and the ignition needle extends into the combustion chamber to ignite the combustion medium; the blower device is arranged in the mounting cavity; the circuit board is arranged in the mounting cavity, is connected with the bottom cover and is electrically connected with the automatic igniter and the blower device; and the power supply is arranged in the mounting cavity, is connected with the bottom cover and is electrically connected with the circuit board. The automatic igniter is arranged in the gas inlet, so that gas is supplemented into the combustion chamber in the ignition process, and the effect of promoting combustion is achieved.

The utility model discloses an A-face-free frame trimming device which comprises an installation frame, a moving assembly and a cutting assembly, a bearing platform is arranged on the installation frame, the moving assembly comprises a horizontal moving part and a vertical moving part, the horizontal moving part is movably arranged on the installation frame, the vertical moving part is movably arranged on the horizontal moving part, and the cutting assembly is arranged on the bearing platform. The cutting assembly comprises a base, a driving part, a cutting head and an air blowing part, the base is arranged at the moving end of the vertical moving part, the fixed end of the driving part is arranged on the base, the cutting head is arranged at the driving end of the driving part, a nanometer hydrophobic coating is arranged on the cutting head, the air blowing part is arranged on the base, and the air blowing part is configured to blow off waste on the cutting head. According to the edge cutting device, the nanometer hydrophobic coating is arranged on the cutting head, adhesion of waste materials in the cutting process is reduced, the cleaning frequency is reduced, meanwhile, the waste materials on the cutting head are cleaned in cooperation with the air blowing piece, the manual cleaning process is omitted, and the cleaning efficiency is improved.

The utility model discloses a large mixed combustion cooking stove, and belongs to the technical field of cooking stoves. The large cooking stove mainly comprises a large cooking stove body, a stove opening is formed in the surface of the large cooking stove body, and a storage groove is formed in the large cooking stove body in a penetrating mode; the air blowing assembly is mounted in the storage groove; the clamping and fixing assembly comprises a square hollow frame, the square hollow frame is installed in the storage groove, and a breathable grid plate is buckled to the storage groove; the mounting seat is mounted on the large cooking range body, and a boss is mounted on the mounting seat; the screw rod is in threaded connection with the boss; the clamping plate is connected to one end of the screw through a bearing, and a limiting groove matched with the clamping plate in width is formed in the installation base. According to the large mixed combustion cooking range, the grip is held to rotate so as to drive the screw rod to rotate, so that the clamping plate gradually gets close to the upper end face of the breathable grid plate, the breathable grid plate is fixed, and the breathable grid plate can be cleaned conveniently.

The power storage device (10) comprises: at least one power storage cell with a lower surface provided with a safety valve (SV); a lower housing (310) with a bottom surface (312) provided beneath the at least one power storage cell; a spacer element (340) provided between the lower surface of the lower housing and the at least one power storage cell to form a space (S) together with the lower surface of the lower housing; and a support element (350) that supports the spacer element and receives an air blast released by the safety valve. The spacer element (340) has a through-hole (340h) provided beneath the safety valve (SV).

The utility model provides a drying mechanism for garment processing, which relates to the technical field of garment processing and comprises a fixed support shell and a cold and hot drying integrated mechanism, support slide bars are slidably connected to two sides of the fixed support shell, one side of each support slide bar is fixedly connected with a barrier plate, and the barrier plates are arranged on the inner side of the fixed support shell. When the knitwear is dried, the air inlet grooves in the side edges can be blocked by the blocking plates, air is sucked into the fixed supporting shell through the air inlet grooves in the lower side through the air blowing fan to conduct cold air drying operation on the knitwear, and when polyester fiber clothes are dried, the supporting sliding rod can slide to the leftmost side, and the supporting sliding rod can slide to the leftmost side; the electric conduction supporting feet are connected with the thermal control board, the heating module is driven to heat the heating copper wires, and the air blowing fan conducts heating through the heating copper wires when exhausting air from the side edge air inlet open groove. And warm air enters the fixed supporting shell to conduct hot drying operation on the clothes, and therefore drying operation on the clothes made of different materials can be achieved.

The invention discloses a rotary incubator suitable for multiple tissue engineering materials, and belongs to the technical field of experimental equipment. According to the device, a culture tube is placed in a clamping sleeve at a corresponding position, at the moment, a second electric push rod can be controlled to work and shorten to pull a sliding rod to move, the sliding rod can move to drive a top pressing disc to move downwards, and the pressing disc can make contact with the top of a container when moving downwards, so that the container can be clamped and limited; if an opening in the top of the container is not provided with a sealing cover, the opening of the container can be sealed through pressing of the pressing disc, and the container can move along with the clamping sleeve when the driving mechanism drives the container to be shaken up through axial abutting of the clamping sleeve and the container, so that the situation that the container topples over and leaks liquid due to circumferential shaking-up movement is avoided, and the shaking-up processing stability is improved; the heater main body on the rear side can perform constant-temperature treatment through air blowing or heat radiation, so that the placement and culture effects are improved.

The efficient heat exchange integrated hydrogen production combustion device comprises a machine body, a feeding assembly, a high-temperature cracking assembly and an ignition assembly, the inlet end of a first pipeline is connected with a feeding source, the outlet end of the first pipeline is connected with the high-temperature cracking assembly, and a gas outlet of the high-temperature cracking assembly is connected with a combustion head; the combustion inner container is arranged in the shell, a flame outlet is formed in the end, extending out of the shell, of the combustion inner container, a snakelike pipeline is arranged in the combustion inner container, the inlet end of the snakelike pipeline is communicated with the first pipeline, and the outlet end of the snakelike pipeline is communicated with the combustion head. The electric spark generator is arranged in the machine body, the end of the electric spark generator extends to the position of the combustion head, an air blowing cavity is formed in the machine body and communicates with the combustion inner container, an air blower is arranged at the position, corresponding to the air blowing cavity, of the machine body, and an air inlet assembly communicating with the air blowing cavity is further arranged on the machine body. Hydrogen production and combustion integration is achieved, storage and transportation are omitted, and safety and high efficiency are achieved.

The invention provides a meat preservation method with self-assembled nanoparticles cooperating with a three-layer controlled release film. The method comprises the following steps: S1, selecting fresh meat, removing impurities, cleaning, detecting the muscle fiber density and the total number of initial bacterial colonies, classifying the meat into I / II / III classes according to the standard, and pre-cooling and discharging acid for 18-24 hours under the conditions that the temperature is 0-2 DEG C, the air speed is 0.3-0.5 m / s and the humidity is 85-90%; s2.2, graded loading of dormant-state self-assembled nanoparticles at the temperature of 2-4 DEG C, I-type dip coating, II-type ultrasonic-assisted dip coating, III-type high-pressure atomization spraying and air drying in a blast environment after loading; s3, filling three layers of controlled release films, vacuumizing to-0.095 to-0.09 MPa, keeping for 20 seconds, filling customized controlled atmosphere according to grades, and then performing heat sealing; and S4.0, refrigerating at 0-4 DEG C. By constructing a synergistic mechanism that the self-assembled nano-particle adsorption layer recognizes a decay signal in a close range and the three layers of controlled release films release drugs in a linkage mode and strengthen barrier, the limitation that traditional preservation is passively inhibited and active ingredients are lost quickly is broken through, and the technical problems that bacteriostasis is not lasting, the water-retaining property is poor and sensory quality is prone to deterioration are fundamentally solved; and the fresh-keeping efficiency and the meat quality are both improved.

The utility model belongs to the technical field of evaporators, and particularly relates to a freezing evaporator assembly which comprises a base. An evaporator main body is mounted on one side in the base; a blower device shell is fixedly connected to one side of the exterior of the base; a first servo motor is mounted in the blower device shell; the output end of the first servo motor is fixedly connected with fan blades; in the long-term use process of the freezing evaporator, due to the facts that the surface temperature of the freezing evaporator is low, frosting and freezing are likely to occur, too thick frost blocks air circulation, the heat exchange efficiency is reduced, and the refrigerating effect is poor, when frost appears on the surface of the evaporator body, the defrosting effect can be achieved only by opening the heating piece, and the defrosting efficiency is improved. And the influence of thicker frost on the refrigeration effect is reduced.