680results about How to "Uniform cooling" patented technology

The invention relates to a rotary water mist sprayer which is usually installed outside protected facilities, at safety evacuation exits, air wells and the like. The rotary water mist sprayer adopts a structure of dual-way rolling balls and dual-way O-shaped rings and is shaped as a mushroom. When the rotary water mist sprayer works, a high-pressure water source enters a mandrel through a filter screen and arrives at each spray core and spray nozzle of the sprayer body, the water flow is atomized into fine water drops less than 120 mu m to be sprayed, and the eccentric reacting force generated by each spray nozzle enables the sprayer body to rotate around the mandrel, and the water mist is sprayed in complete 360 DEG C. The invention belongs to the fields of fire control isolation, protection cooling and elimination of infrared radiation and radar signature of protected facilities. The rotary water mist sprayer is provided with a lock plunger, a filter screen, the mandrel, the rolling balls, screws, the spray cores, the spray nozzles, the spray body and the O-shaped rings and is widely applied to military industry, electric power, chemical industry, aerospace, ships, metallurgy, undergrounds and tunnels.

The invention provides a control method for a vertical air conditioner. An indoor unit of the vertical air conditioner comprises an upper evaporator, an upper draught fan and at least one upper air supply port which are matched and further comprises a lower evaporator, a lower draught fan and at least one lower air supply port which are matched. The control method comprises the following steps that the indoor environment temperature Ta is detected; if Ta is higher than the preset refrigeration comfortable temperature zone in the refrigeration mode or is lower than the preset heating comfortable temperature zone in the heating mode, the upper draught fan and the lower draught fan run at the high rotating speed; if Ta is located in the refrigerating comfortable temperature zone in the refrigerating mode or is in the heating comfortable temperature zone in the heating mode, the upper draught fan runs at the high rotating speed, and the lower draught fan runs at the low rotating speed; and if Ta is lower than the refrigerating comfortable temperature zone in the refrigerating mode or is higher than the heating comfortable temperature zone in the heating mode, the upper draught fan runs at the low rotating speed, and the lower draught fan shuts down. According to the control method, air supply is more intelligent, air supply and soft air supply can be achieved according to needs, and the comfort degree of users is improved.

The invention discloses a hot stamping die of a snakelike cooling water channel type, and the hot stamping die comprises a convex die insert and a concave die insert, which are arranged in a paired manner. The convex die insert is provided with a convex part so as to enable the cross section of the convex die insert to be convex. The concave die insert is provided with a concave part so as to enable the cross section of the concave die insert to be concave. The interiors of the convex and concave die inserts are respectively provided with a snakelike cooling water channel, and the depths of the snakelike cooling water channels are set in a manner that the bottoms of the snakelike cooling water channels are close to surface where the convex die insert with the concave die insert. The hot stamping die is simple in machining mode, has no cooling dead zone, and is uniform in cooling degree and speed. Moreover, the sizes of the inserts are not limited, thereby simplifying the structure of the die, improving the machining efficiency, achieving a good cooling effect, facilitating the assembly and maintenance, and reducing the cost.

The invention provides a silicone tunable optical filter, comprising a silicone tuning cavity, a highly-doped silicone resistance heater, a lower cantilever beam, an upper cantilever beam, a left surface highly-doped cantilever beam, a right highly surface doped cantilever beam, a metal lead, a stress balancing metal lead, a left lead region, a right lead region and an SOI (Silicon-on-Insulator) supporting silicon substrate 11. The silicone tunable optical filter is obtained by using an SOI wafer with high resistance and a silicone machining process. A making method provided by the invention comprises the following steps of: (a) making a highly doped region on the surface of an SOI wafer device layer; (b) sputtering metal on the surface of the wafer device layer and making a metal structure; (c) making the silicone tuning cavity and each cantilever beam structure on the surface of the wafer device layer; (d) releasing the silicone tuning cavity and the cantilever beam structure from asubstrate layer of the lower surface of the silicon wafer; and (e) making high reflective films on the upper and lower surfaces of the silicone tuning cavity to form an optical F-P interference cavity body. The made filter has the advantages of very good optical performance, simple making process and high structural reliability.

A cooling structure for uniformly cooling a bore wall of a cylinder block using a cooling medium, the bore wall surrounding plural bore regions, includes a water jacket portion which is provided so as to surround an entire outer periphery of the bore wall, and which is supplied with the cooling medium; a water jacket spacer which is inserted in the water jacket portion; a passage through which the cooling medium in a portion of an inter-bore region is transferred to another portion of the inter-bore region, the inter-bore region being positioned in a vicinity of a boundary between the bore regions adjacent to each other; and a flow promotion device which increases a flow rate of the cooling medium flowing in the passage.

A cooling structure of a cylinder block includes a water jacket portion which is provided so as to surround an entire outer periphery of the bore wall; a water jacket spacer which is inserted in the water jacket portion; and a gasket which is provided in an upper portion of the cylinder block, and which includes a hole leading to the water jacket portion. The water jacket portion is supplied with coolant. A distance between a center of the hole and an outer periphery of the cylinder block is shorter than a distance between a center of the water jacket spacer in a thickness direction and the outer periphery of the cylinder block. In the cooling structure, the cylinder block can be uniformly cooled.

The invention discloses a stem cell cryopreserving box and a cryopreservation method. The stem cell cryopreserving box comprises a box body, a box cover and baffle plates, wherein an opening is arranged at the top part of the box body, and pressure adjusting and fixing devices are arranged outside two opposite side walls on the box body; a plurality of collection bags and a plurality of baffle plates are arranged in the box body alternately, and the baffle plates are located at the topmost part of the alternate arrangement of the collection bags and the baffle plates; and the box cover is located at the top part of the box body and is connected with the pressure adjusting and fixing devices on the side walls of the box body by fasteners. Compared with the prior art, when the stem cell cryopreserving box and the cryopreservation method are used, stem cell samples of the same patient can be placed in one box body, and the box cover can press the collection bags into a flat shape, so that stem cells can be uniformly cooled; each box body, as an independent storage unit, is convenient to take and use; and when the box body is taken and used, the operation is simple, and the consumed time is shorter, so that the refrigerator door opening time is shortened, and the temperatures of other box bodies are slightly influenced.

The invention provides a 3D color printer capable of monitoring product quality online. The 3D color printer comprises a base, a vertical column, a printing nozzle, a printing moving mechanism, a workbench, a scanning device and a control processor, wherein the printing moving mechanism is connected with the printing nozzle and used for driving the printing nozzle to move within an XY plane; the workbench is arranged below the printing nozzle; a first driving mechanism is connected with the workbench and drives the workbench to move in the Z axis direction; an annular chute is arranged on the base; the projection, on the base, of the workbench is within an area defined by the inner contour of the annular chute; the scanning device is mounted on the chute; a second driving mechanism is in transmission connection with the scanning device and drives the scanning device to slide along the chute; the printing nozzle comprises a base plate, a stirring box, a stirring device, a heating block, a conveying tube, an extruding tube, a temperature sensor, an assistant heating layer, a heat preserving layer, a temperature controller, a branched air tube, an annular air tube and an air pump. With the adoption of the 3D color printer, a color model can be printed, and the accuracy is high; meanwhile, the model quality and color quality of a printed object can be monitored.

Edible fungus antistaling method and apparatus are disclosed. The method includes dehumidifying fresh edible fungus with circulating wind inside a sealed vacuum processing chamber to reach set temperature and water content, and fast vacuum freezing to further eliminate water of edible fungus. The said method can maintain the metabolism of edible fungus and reach required temperature and water content of edible fungus without contamination and damage to look of edible fungus. The method and apparatus has low power consumption, results in homogeneous temperature and water content inside and outside the edible fungus, controls water content in edible fungus in 70-88 % and makes edible fungus capable of being preserved and transported at low temperature for long period.

The invention provides an air outlet system of an air-cooled type refrigerator. Cool air is horizontally blown out through a cool air outlet (44) on a refrigerating room air channel (4) arranged on the back surface of a refrigerating room (1); the cool air is vertically downwards blown out through an air curtain outlet (61c) on an air curtain device (6) arranged on the top of the refrigerating room (1), thus the cool air can be uniformly blown out from all directions; and a powerful belt-shaped cool air barrier is also formed and can effectively prevent the cool air from overflowing when a refrigerator door is opened.

The invention provides a long-distance temperature control system of a machine machining tool. The long-distance temperature control system comprises a cooling device, a drive device, a detection device used for detecting the temperature of the machine machining tool, a controller and a long-distance control client-side. The cooling device is connected with the drive device. The drive device is connected with the controller and used for controlling the drive device to change the position where the machine machining tool is cooled through the cooling device. The detection device is connected with the controller. The long-distance control client-side is connected with the controller in a wireless data transmission mode and used for sending a control command to the controller. By means of the long-distance temperature control system, the cooling of a traditional machine machining tool and the internet of things are combined, a cold air blast jet flow machine is controlled through an intelligent mobile phone, the position of a spray nozzle can be adjusted according to actual requirements, the machine machining tool is uniformly cooled, the long-distance control over the temperature of the machine machining tool is achieved, and the long-distance temperature control system has the advantages of being easy to use, convenient to control, good in cooling effect, low in energy consumption and capable of controlling the tool temperature any time any place.

The invention discloses a novel concrete intelligent temperature control system and method. The system comprises a main server, an intelligent monitoring main control room and branch control stations. The main server of the system is responsible for data storage, management, calculation, analysis, pre-warning, forecasting and instruction transmission of the whole system and can dynamically and visually display all types of temperature control information in form of graphs, lists and lines, and related workers can conveniently conduct supervision and management. The intelligent monitoring main control room directly distributes instruction information of the main server to all the branch control stations and can send temperature control information of all the branch control stations to the main server in a concentrated mode. The branch control stations draw all monitoring devices to the system so that management and information transmission can be conveniently conducted. By means of the modularized, unitized and systemic design, the true temperature and stress, influenced by the true environment where various factors exist at the same time, of concrete are achieved, man-made influence factors are reduced through intelligent water injection, and rapid and high-quality construction of large-size concrete are ensured under the complex environment conditions.

The invention discloses a multifunctional cold storage preservation storehouse. The multifunctional cold storage preservation storehouse comprises a storehouse body and an intelligent control system which is connected with the storehouse body and controls the storehouse body. The storehouse body is provided with a liquid nitrogen adjusting system and a humidity adjusting system. The liquid nitrogen adjusting system comprises a refrigerant tank installed at one end outside the storehouse body, a temperature sensor, an oxygen concentration sensor, a liquid nitrogen conveying pipeline and an atomization nozzle. The temperature sensor, the oxygen concentration sensor, the liquid nitrogen conveying pipeline and the atomization nozzle are arranged in the storehouse body. The humidity adjusting system comprises a humidity sensor and a humidifier. The multifunctional cold storage preservation storehouse has the main advantages that the application occasions are wide, and the structure is simple and convenient; liquid nitrogen serves as a refrigerant, so that no additional resources need to be consumed for heat exchange, equipment is simple, and fast cooling can be achieved; and data in the storehouse can be monitored in real time, the refrigerant tank can be locked in all directions and can be replaced conveniently, all indexes of the storehouse body can be monitored automatically and precisely, and data are recorded, saved, printed and transmitted.

The invention discloses a control method of a cabinet air conditioner and the cabinet air conditioner. The cabinet air conditioner comprises a case, a first wind wheel component, a second wind wheel component and a calm wind feeling signal triggering device, wherein the first wind wheel component and the second wind wheel component are arranged in the case; an air inlet, a first air outlet and a second air outlet are formed in the case; the first air outlet is strip-shaped; the length direction of the first air outlet is a vertical direction; the second air outlet is arranged above the first air outlet; and air from the second air outlet has a horizontal component. The control method of the cabinet air conditioner comprises the following steps: when the first wind wheel component and the second wind wheel component work simultaneously, judging whether a calm wind feeling mode command signal sent by the calm wind feeling signal triggering device is received or not; and if yes, controlling the first wind wheel component to close.

An air flue system of a compartment of a refrigerator comprises an air flue device which comprises a first cover plate, a second cover plate, an air flue part and a fan. The air flue part is installed between the first cover plate and the second cover plate, the first cover plate is close to an opening surface of the compartment, the second cover plate is installed close to the back wall of an inner cavity of the compartment, and the fan is slantingly installed on the second cover plate. A first cold air flue is arranged between the flue part and the first cover plate, a first warm air flue is arranged between the air flue part and the second cover plate, and the fan is communicated with the first cold air flue. An air return port is arranged on the air flue device and communicated with the first warm air flue. An air outlet is arranged on the first cover plate and communicated with the first cold air flue. The invention further provides a refrigerator comprising the compartment, wherein the air flue system is installed in the compartment. The air flue system of the compartment of the refrigerator and the refrigerator solve problems of low refrigeration efficiency in compartment air supply, non-uniformity in air supply and large temperature difference.

The invention discloses a power lithium battery cooling plate. The power battery cooling plate comprises a forming plate and a flat plate, the forming plate is internally provided with a plurality ofrunners, the power battery cooling plate is characterized in that each runner comprises a freezing medium entrance section, a plurality of flows and a freezing medium exit section which are sequentially connected in series, a heat exchange area is formed in the flow, and the heat exchange areas of the various runners are arranged in parallel. A freezing medium of an automobile refrigerating systemis used as a refrigerant to cool a lithium battery. The freezing medium enters the cooling plate from the entrance section of the runner, exchanges heat with the battery in the runner, and flows outfrom the exit section after absorbing the heat. As the multiple runners are adopted, the flow distribution of the freezing medium on the cooling plate is reasonable, and the effect of evenly cooling the battery is produced. Each runner is provided with a plurality of flows, the cold and hot flows are distributed in a staggered manner, so that the heat exchange is more sufficient, and the heat exchange efficiency is improved.

A facility is provided for manufacturing a steel plate excellent in steel plate shape and mechanical property while setting low cooling-water spraying performance in a descaling step and achieving uniform cooling in a cooling step. Specifically, a hot rolling mill 3, a first hot leveler 5, a descaler 4, and cooling equipment 6 are arranged in that order from the upstream side in a conveying direction. A pressure P [MPa] at the point of impact of cooling water sprayed from the descaler to each surface of a steel plate 1 is greater than or equal to 1.5 MPa.

The invention relates to a fruit and vegetable e-commerce cold-chain fresh-keeping container which comprises an outer-layer container, an inner-layer container, a sealing cover and a low power consumption internal circulation fan, wherein the inner-layer container is arranged inside the outer-layer container with a gap; the outer-layer container and the inner-layer container share one same sealingcover; a lifting handle is manufactured at the upper part of the sealing cover; the sealing cover tightly seals and covers the inner-layer container and the outer-layer container simultaneously; boththe material and the internal structure of the container cover are identical to those of the outer-layer container; on the inner side of the inner-layer container, a fresh-keeping adjusting assemblyis mounted at a ventilation window corresponding to the fan; the fresh-keeping adjusting assembly is a frame; the frame is made of a net and is opened front and back; a front opening corresponds to the ventilation window; an NO slow release block, a plant essential oil slow release block and a 1-mcp slow release block are placed in the fresh-keeping adjusting assembly from top to bottom in sequence; and an adsorption block is mounted inside the ventilation window corresponding to a sealing gate. Due to addition of slow release materials, environments in sub-containers can be adjusted, meanwhile, real-time gas regulation and control on micro environments in the containers can be implemented, and purposes of gas adjustment and corrosion prevention and environment protection and security canbe achieved.

A workpiece chuck includes a thermal plate assembly which includes both heating and cooling capability. The heating element can be a resistive heater in a coiled configuration disposed in a plane. The cooling can be performed via a cooling fluid circulated through cooling tubes which are also disposed in a coiled configuration in a plane. The plane of the heating element and the cooling tubes can be the same plane, and that plane can be a center plane of the thermal plate assembly. By locating the heating and cooling in the same plane, uniform heating and cooling are achieved. Also, by locating the heating element and cooling tubes in the center of the thermal plate, distortions such as doming and dishing in the thermal plate are eliminated such that the wafer can be held extremely flat on the chuck. The heating element and cooling tubes are coiled in an interleaved fashion to provide uniform heating and cooling while allowing them to simultaneously occupy the same plane.

The invention discloses a cooling device for a power lithium battery. The cooling device comprises a second branch consisting of a cooling plate and a second expansion valve at the front end of the cooling plate. The cooling device is characterized in that the second branch is connected in parallel with a first branch consisting of an evaporator of an automobile refrigerating system and a first expansion valve at the front end of the evaporator, wherein the cooling plate is attached to the battery. According to the cooling device for the power lithium battery, a liquid refrigerant from a condenser is divided into two paths; after being throttled and depressurized by the first expansion valve, the first path of liquid refrigerant enters the evaporator, is gasified to absorb heat in the evaporator, and exchanges heat with outside air, so as to achieve a refrigeration effect; after being throttled and depressurized by the second expansion valve, the second path of liquid refrigerant is directly charged into the cooling plate, after being attached to the cooling plate, the battery is in tight contact with the cooling plate, heat generated during operation of the battery is transferred to the cooling plate, the refrigerant is evaporated to absorb heat in the cooling plate, and the generated heat during operation of the battery is taken away, so that the temperature of the battery is reduced.

The invention discloses a low-temperature ultrasonic vibration fatigue experiment system. The low-temperature ultrasonic vibration fatigue experiment system comprises a piezoelectric transducer and an ultrasonic signal generator. The electric energy input end of the piezoelectric transducer is electrically connected with the alternating current signal output end of the ultrasonic signal generator, and the mechanical vibration output end of the piezoelectric transducer is connected with a test piece. A cryogenic box is further included and is of a closed box body structure, the test piece is located in the cryogenic box, a cooler is further arranged in the cryogenic box, a cooling device is further arranged outside the cryogenic box, and the cooling device is connected with the cooler through a pipeline. The cooler is of a spiral-coil-shaped structure, and the reciprocating direction of the test piece is located on the axis of the spiral-coil-shaped structure. A convection fan arranged in the cryogenic box is further included, and the axis of the convection fan is collinear with the axis of the spiral-coil-shaped structure. According to the system, a low-temperature vibration fatigue loading experiment can be efficiently conducted on the test piece.

The invention relates to a vacuum refrigerating tumbling machine, which aims to solve the technical problem that the current vacuum refrigerating tumbling machine is long in refrigerating time and larger in local difference in temperature. The technical scheme adopted is that the vacuum refrigerating tumbling machine comprises a tumbling barrel connected with a frame, a main shaft fixedly connected with the tumbling barrel, and a driving mechanism connected with the main shaft, wherein a refrigerating layer and an insulating layer are sequentially arranged between the inner and outer walls of the tumbling barrel respectively; the key point is that a middle refrigerating cabin is further arranged inside the tumbling barrel along the axis, the middle refrigerating cabin is internally provided with a partition board and is divided into a water inlet cabin and a water outlet cabin through the partition board; the water inlet cabin is communicated with a main water inlet via a first water inlet pipeline while the water outlet cabin is communicated with the water inlet of the refrigerating layer via a first water outlet pipeline, and the water outlet of the refrigerating layer is communicated with a main water outlet through a second water outlet pipeline to form a serial cold water circulating system. The invention has the technical effects that the vacuum refrigerating tumbling machine is uniform in cooling, small in local difference in temperature, fast refrigerating speed and good effect, and 1 / 3 refrigerating time can be shortened, and the quality of meat products can be better ensured.

The invention provides a hot braising method for phosphorus removed slag and carbon removed slag. The method comprises the following steps of: pouring hot phosphorus removed slag into a slag braising pit to parch the slag braising pit; pouring the phosphorus removed slag or the carbon removed slag into multiple parched slag braising pits respectively, turning over, dewatering and breaking the slag in each slag braising pit, then pouring another slag respectively, and repeating the operations of turning over, dewatering and breaking the slag till each slag braising pit is full of the slag; and covering the slag braising pits full of the slag with slag braising covers, and braising the slag in a three-section dewatering and braising mode. The hot braising method for the phosphorus removed slag and the carbon removed slag is simple and feasible, can reduce the potential safety hazard of blasting of the slag braising pits and effectively improve the slag braising efficiency and slag braising quality, and has remarkable economic benefits.

The invention provides a refrigerator with a main cover and a subsidiary cover. The refrigerator comprises an insulated box body, an insulated cover body and at least one dilution refrigeration element, wherein the insulated cover body can be rotatably pivoted on the insulated box body so that the insulated cover body is closed on the insulated box body to form a closed space; the insulated cover body comprises a base and a cover plate, the base is provided with a groove, and the cover plate can be rotatably pivoted on the base so that the cover plate is closed in the groove of the base; the groove is provided with a plurality of air vents; and the dilution refrigeration element is arranged in the groove. The insulated cover body can be designed into the main cover and the subsidiary cover and forms a closed storage space together with the insulated box body, and the main cover and the subsidiary cover can be used for placing dilution refrigeration elements and separating stored articles with the replaceable dilution refrigeration elements to avoid polluting the dilution refrigeration element because of condensed water.

A method and apparatus for effecting rapid thermal cycling of samples, by producing a high-velocity air flow through a closed loop flow path, and energizing an electrical heater within the closed loop flow path to heat the air flowing therethrough to a desired temperature. A sample holder is introduced into the closed loop flow path for exposing the sample holder to the high-velocity heated air flowing therethrough for rapidly heating the sample. The sample is rapidly cooled to a desired temperature by de-energizing the electrical heater, and opening an air outlet from the closed loop flow path, while continuing to produce the high-velocity air flow therethrough.

This invention provides a way to preserve water from the flowers un the process of vacuum pro-coldness when cut flowers. The factory is put the tidied flowers stem into the container with enough liquor. Ensure that the stem is under liquor. Put the probe into the liquor in the same time, and then put the container with flowers into the vacuum jug. Start the vacuum pump to depress the air pressure, accommodate the temperature to the required standard, close the vacuum pump, and then recover to normal pressure. This way can decrease the depletion of flowers in transport decreased water depletion, solved the problem of long distance transport. Promote the development of flowers commerce in our nation and other nations.

The invention relates to a sprinkling device, in particular to a sprinkling device for poultry cooling. The technical problem to be solved by the present invention is to provide a sprinkler device for poultry cooling with fast cooling speed and convenient operation. In order to solve the above technical problems, the present invention provides such a sprinkling device for poultry cooling, which includes a bottom plate, wheels, poles, pumping devices, a first water tank, a push handle, a third hard pipe, etc.; the bottom of the bottom plate is provided with wheels, The top of the bottom plate is provided with a support rod, a pumping device, a first water tank and a push handle in sequence from left to right, a third hard tube is arranged at the upper end of the support rod, a nozzle is arranged at the left end of the third hard tube, and a nozzle is connected to the right end of the third hard tube. The flexible pipe is connected with the lower part of the left wall of the pumping device. The invention achieves the effects of fast cooling speed and convenient operation. The cooling device can quickly cool down the disinfectant water, and the cooled disinfectant water can quickly absorb the heat in the poultry body by spraying the cooled disinfectant water on the poultry.

The invention relates to a radiating nozzle of a 3D printer and belongs to the technical field of parts of 3D printing equipment. The radiating nozzle comprises a sprayer, an air supply apparatus and a sleeve, wherein a spraying channel is arranged in the sprayer; a radiating groove is formed in the outer side of the side wall of the spraying channel and radiates in the outlet direction of the spraying channel; the air supply apparatus is used for supplying air to the radiating groove; and the sleeve is arranged on the sprayer in a sleeving manner and is matched with the radiating groove to form a radiating channel. The structure can directly form the radiating channel on the surface of the nozzle to prolong the time that air flow passes through the nozzle and improve the radiating efficiency of the nozzle; as the divergent radiating channel is adopted to synchronously cool the periphery of the spraying channel more uniformly, the radiating efficiency is improved, and blockage caused by excessive reduction of local temperature is avoided. The air-out direction of an air outlet of the radiating channel is the same as the spraying direction of the sprayer; the air at the back of a cooling sprayer is used for preheating, softening and dedusting a to-be-sprayed part so as to ensure adhesion firmness of materials sprayed one after another.

The invention provides a semiconductor refrigeration assembly and a refrigerator. The refrigerator comprises a refrigerator body and the semiconductor refrigeration assembly. The semiconductor refrigeration assembly is arranged on a target side wall of the refrigerator body. The semiconductor refrigeration assembly is arranged vertical. An air channel structure is formed in the inner wall on the back of the refrigerator body. An air channel communicates with a storage bin of the refrigerator body. A cold side radiator is located in the air channel. A cold side fan is further arranged in the air channel. According to the scheme of the semiconductor refrigeration assembly and the refrigerator, after a semiconductor chilling plate refrigerates, cold energy is transmitted to the cold side radiator through a cold conduction block; because the cold side radiator is used as a cold side evaporation device, and an aluminum liner is omitted, under the action of the cold side fan, cold energy evaporated by the cold side radiator carries out thermal exchange with air in the storage bin of the refrigerator through air convection, the thermal exchange efficiency can be improved, and by adoptingthe manner of air convection, articles in the storage bin can be cooled even, and refrigeration is quicker.