179results about How to "Effective cooling" patented technology

The utility model discloses a gallium nitride output essential safety type power supply, including power supply body and bottom mounting plate, the casing bottom of power supply body is fixed with bottom mounting plate, still include guide and scatter mechanism, the guide and scatter mechanism includes top and exposes the groove, heat conduction silicon pad, double -faced wrong groove board, edge and exposes the groove, gantry clamping plate, lead touch piece, edge fin, bottom link and horn, through setting up guide and scatter mechanism and carry out heat dissipation improvement to the essential safety type power supply of gallium nitride semiconductor technology's application, and the top and exposes the groove of guide and scatter mechanism cooperation deep groove reduces the casing thickness of power supply body, and then combines heat conduction silicon pad and double -faced wrong groove board, forms the efficient heat conduction path and conducts heat dissipation outward, and simultaneously, the gantry clamping plate collocates lead touch piece and edge fin, constructs the multi -point three -dimensional heat dissipation surface of top surface and side surface formula, solves the casing heat dissipation blind area problem of power supply body, realizes the heat of power supply body and multi -point dispersion export.

The invention belongs to the technical field of vehicle heat dissipation, and particularly relates to a method and system for reducing vehicle heat damage. Comprising a first air duct and a second air duct which are additionally arranged at a front air inlet grille of a vehicle and respectively lead to an engine compartment heat damage part and a power battery; additional grating openings are additionally formed in the positions of a vehicle fog lamp and a vehicle wheel cover; the heat dissipation effect of the engine compartment heat damage part and the power battery is judged according to data returned by the temperature sensor; if the temperature of the engine compartment heat damage part and the temperature of the power battery continuously exceed the set threshold value, the vehicle is prompted to have the heat damage risk through a vehicle large screen, and when the vehicle enters the idling power generation mode, the engine compartment cover is prompted to be opened through the vehicle large screen, so that effective cooling is achieved. The vehicle engine compartment heat damage part and the power battery are subjected to targeted cooling, the heat convection effect is enhanced, and when the cooling effect of the heat convection mode is poor, a user can be prompted to open the engine cover for timely cooling.

The utility model discloses a numerical control double-shaft drilling and milling tapping device, which relates to the field of numerical control machine tools, and comprises a workbench, the lower surface of the workbench is fixedly connected with a support column, one end of the support column far away from the workbench is fixedly connected with a moving wheel, the upper surface of the workbench is fixedly connected with a protective cover, and a transmission mechanism is arranged in the workbench; a connecting seat is fixedly connected to the lower surface of the fixed seat, a connecting rod is connected to the lower surface of the connecting seat, a drilling and milling head is fixedly connected to the end, away from the connecting seat, of the connecting rod, an electric push rod is fixedly connected to the interior of the drilling and milling head, and a moving piece is fixedly connected to the output end of the electric push rod; the transmission mechanism is embedded in the side wall of the workbench, the connecting base is connected with the connecting rod through the magnetic locking mechanism, the drilling and milling head is made of a carbon fiber composite material and internally provided with a cooling channel, and the effects of the numerical control double-shaft drilling, milling and tapping device which improves the machining precision of the drilling and milling device and is simple in structure and good in heat dissipation are achieved.

The utility model relates to hydrogen fluoride production technical field discloses a pipeline descaling system for hydrogen fluoride production, include: evaporative cooling device has the accommodation cavity, fills with domestic water in the accommodation cavity, the cooling pipe inside fills with freon, first pipeline sets up the outside of evaporative cooling device, the import of first pipeline communicates with the below outside end surface of evaporative cooling device, and the export of first pipeline communicates with the outside end surface of the above of evaporative cooling device, first pipeline circulates domestic water through the drive part, and the parallelly connected setting of permanent magnet descaling device is in first pipeline, the utility model discloses through setting permanent magnet descaling device, utilizes the magnetic field effect, changes the scale layer crystallization form, makes it difficult to adhere to the pipe wall, the freon in cooling pipe can more efficiently carry out the cooling at this moment, and the heat exchange effect is high.

The utility model discloses a link communication device, and the device comprises a lower housing which is integrally provided with side plates at two opposite sides; the fixed plate is fixedly connected to the side plate; the first fan is fixedly connected to the fixing plate and located on the side, away from the side plate, of the fixing plate. The switching power supply is fixedly connected to the lower shell, and a second fan is arranged on the surface of the switching power supply; wherein heat dissipation holes are formed in the side plates in a penetrating mode, and heat in the device sequentially passes through the first fan, the second fan and the heat dissipation holes to be discharged.

The utility model relates to the technical field of medicinal plant raw material extraction, especially relates to a low-temperature press of sea buckthorn seed oil. A low-temperature press of sea buckthorn seed oil has a support, a press cylinder, a first servo motor, a spiral oil press roller, an oil storage tank and an arc-shaped heat dissipation fin group, the press cylinder is installed at the top of the support, the right side of the press cylinder is provided with the first servo motor, the output shaft of the first servo motor is fixedly connected with the spiral oil press roller, the space inside the press cylinder and the spiral oil press roller gradually decreases from right to left, the lower part of the press cylinder is fixedly connected with the oil storage tank, and the upper part of the press cylinder is fixedly connected with the arc-shaped heat dissipation fin group in a symmetrical manner around the periphery. The utility model adopts the design that the spiral oil press roller and the internal space of the press cylinder gradually decrease, and is combined with the arc-shaped heat dissipation fin group, so that the oil extraction rate is improved, the effective heat dissipation system is matched to maintain a low-temperature operation environment, the nutritional ingredients in the sea buckthorn seed oil are maximally reserved, and the quality of the product is improved.

The utility model relates to a trunk module and a robot. The trunk module comprises a shell, a fan and a circuit board, a mounting cavity is formed in the shell, the shell comprises a first side plate and a second side plate which are oppositely arranged, the first side plate and the second side plate are suitable for mounting limb modules, a first opening is formed in the first side plate, and a second opening is formed in the second side plate. A first opening opposite to the first opening is formed in the first side plate, a second opening opposite to the first opening is formed in the second side plate, a fan for supplying air to the mounting cavity is arranged in the first opening, and the circuit board is arranged in the mounting cavity and divides the mounting cavity into a first heat dissipation cavity and a second heat dissipation cavity; the first heat dissipation cavity and the second heat dissipation cavity are both communicated with the first opening and the second opening.

The utility model discloses a nutrition meal replacement tank with a temperature control prompt function, which relates to the technical field of nutrition meal replacement tanks, and comprises a tank body and an inner cover which is arranged at an opening of the tank body in a threaded covering mode, and heat dissipation holes are formed in the surface of the inner cover. The surface of the inner cover is covered with an outer cover used for blocking or opening the heat dissipation holes. The inner cover with the heat dissipation holes and the outer cover capable of being opened and closed are arranged at the opening of the tank body, when the meal replacement needs to be subjected to heat dissipation, the tank body does not need to be completely opened, the outer cover is opened through the opening and closing assembly, effective heat dissipation can be achieved through the heat dissipation holes of the inner cover, operation is more convenient and rapid, and the heat dissipation efficiency is improved. The meal replacement tank has the advantages of being simple in structure and capable of preventing dust and impurities from falling into the tank, and the problems that when a traditional meal replacement tank dissipates heat of stored meal replacement, a tank body cover usually needs to be directly opened, the dust and the impurities easily fall into the tank to pollute the meal replacement, and frequent cover opening operation is tedious are solved.

The invention belongs to the technical field of photovoltaic panels, and particularly relates to an energy-saving elevator photovoltaic panel mounting structure which comprises a base station, a side wall is fixedly connected to one side of the base station, two outer stand columns are fixedly connected to the corners of the base station, and two symmetrical vertical shafts are arranged between the two outer stand columns. A vertical shaft is arranged between each outer stand column and the side wall and close to the outer stand column, multiple sets of second shaft seats are fixedly connected to the two outer stand columns, a photovoltaic panel frame is rotationally connected between each set of second shaft seats, and multiple first shaft seats are fixedly connected to the two inner stand columns close to the outer stand columns. Each first shaft seat is rotationally connected with a frame seat rotationally connected with the vertical shaft, each frame seat is rotationally connected with a photovoltaic panel frame, and the outer side of each photovoltaic panel frame is fixedly connected with a photovoltaic panel. The horizontal angle and the vertical angle of the photovoltaic panel frame and the photovoltaic panel are adjustable, so that the photovoltaic panel can be located at the optimal sunlight incident angle, the electric energy conversion efficiency of the photovoltaic panel is improved, the generating capacity is improved, and then the energy-saving effect is improved.

This invention provides a method for manufacturing a circuit board assembly, comprising the steps of: providing a circuit board including a heating element, the circuit board having a flow channel, one end of the flow channel being connected to the heating element; providing a shock absorber within the circuit board, the shock absorber having a receiving groove, the receiving groove being connected to the other end of the flow channel; and providing a fan within the receiving groove to obtain the circuit board assembly, wherein the sum of the length, width, and height of the fan does not exceed 90 mm. Furthermore, this invention also provides a circuit board assembly.

This utility model relates to the field of livestock breeding equipment, specifically a spray guiding device for cooling livestock sheds. The spray device includes a connecting component that penetrates a support plate for connecting to an external water source. Below the connecting component is a spraying component for spraying water. The guiding device includes a fixing component mounted on the spraying component. Inside the fixing component is a guiding component for diffusing the water mist from the spraying component according to different livestock sheds. This utility model uses a motor-driven rotating shaft to synchronously adjust the angles of four guiding vanes via belt transmission to adapt to the needs of different livestock sheds. Water in the storage tank is treated by a water softening module and then pumped to a distribution pipe, forming water mist through multiple nozzles on the spray head. The vortex-shaped guiding vanes on the outside of the spray head guide the airflow to form a spiral air curtain. Combined with the guiding groove of the protective cover, this significantly increases the diffusion radius of the mist particles, achieving efficient and uniform water mist cooling.

The utility model discloses a kind of database management equipment, including cabinet A and cabinet B, the front end of cabinet A and cabinet B is respectively equipped with openable cabinet door;Cabinet A inside is equipped with the mounting seat for installing hard disk, and in the inside of cabinet A and its belonging cabinet door inboard are all equipped with the water-cooling plate that can be cooled to the inside of cabinet, mounting seat and the water-cooling plate being equipped in the inside of cabinet A are all through support mechanism set in the inside of cabinet A;Cooling mechanism is equipped in cabinet B, and cooling mechanism is connected with water-cooling plate through corresponding pipeline.The utility model realizes data storage and cooling liquid cooling mechanism separation, effectively the effective heat dissipation of hard disk operating environment in database management equipment, reduce the risk of hard disk internal mechanical component abrasion, read-write performance decline, service life shortening and data loss caused by high temperature, effectively avoid the heat generated by cooling mechanism operation to cause influence on the inside environment of the cabinet A of storage hard disk, guarantee the stability of hard disk operating environment.

This utility model relates to an outdoor unit of an air conditioner, including an outdoor unit body, an electrical control box, and a heat dissipation module. The outdoor unit body has a heat dissipation duct. The electrical control box is located inside the outdoor unit body and includes a housing, a refrigeration mechanism located inside the housing, and an electrical control main board located on the side wall inside the housing. The refrigeration mechanism has an air supply vent and a return air vent, and is used to deliver cold air from the air supply vent and recover hot air from the return air vent. The heat dissipation module is located on the outer surface of the side wall of the housing where the electrical control main board is located, and is situated on the heat dissipation duct. The outdoor unit of this utility model can achieve effective heat dissipation inside the electrical control box while ensuring the sealing of the power box, effectively preventing dust and water damage.

The invention discloses a temperature-controllable and adjustable lithium battery, which comprises a shell playing a protection role, the inner side of the shell is provided with a separation cavity and a liquid cavity, the left end of the shell is provided with a ventilation filter hole, and the upper end of the shell is provided with a wire connector; the driving assembly is installed on the inner side of the partition cavity, automatic conveying of the cooling liquid is achieved through the wind power effect, and temperature control adjustment is completed; the battery assembly is installed on the inner side of the shell, the battery assembly comprises a frame body mechanism and a battery main body arranged on the inner side of the frame body mechanism, the upper end and the lower end of the frame body mechanism are both provided with supporting mechanisms for improving the installation stability of the battery assembly, and the upper end and the lower end of the frame body mechanism are provided with fire extinguishing mechanisms for achieving fault power-off fire extinguishing. The temperature-controllable and adjustable lithium battery can achieve effective heat dissipation through wind power generated in the running process of a vehicle, can achieve automatic isolation fire extinguishing after a single battery breaks down and breaks out of fire, and is high in use safety.

The application discloses a kind of torsional endurance test machines of automobile clutch driven disc assembly, belong to automobile clutch driven disc assembly testing machine technical field, the present application includes frame, the upper surface of the frame is fixedly installed with driving module, and the output end of driving module is fixedly installed with output shaft, and slidingly arranged with moving seat on frame, simultaneously fixedly installed with spline shaft on moving seat, the end of the output shaft is fixedly installed with positioning plate, and the outside of positioning plate is provided with the quick locking member for fixing from driven disc friction disc body, and the outside of positioning plate is provided with pressing plate.The torsional endurance test machine of automobile clutch driven disc assembly can quickly, high-precision locking clutch driven disc assembly, and can be self-adapting adjustment positioning by centrifugal force, while realizing protection, ensure the effective heat dissipation of spring piece, effectively ensure test data precision.

The utility model relates to a heat dissipation technical field, concretely relates to a pouring and sealing heat dissipation structure. A pouring and sealing heat dissipation structure, include: shell, the shell upper end opening, the opening place forms the flanging, element, the element is placed in the shell, the upper surface of element with the opening of shell is flush, the clearance between element and shell pours into the heat conducting glue, top heat conducting pad, top heat conducting pad is bonded and fixed in the flanging, the lower surface of top heat conducting pad is bonded with the upper surface of element. The technical problem of increasing cost and weight of pouring and sealing heat dissipation mode in the prior art to put the magnetic piece completely in the complex structure mounting groove pouring and sealing needs a large number of heat conducting glue.

The application discloses a rapid cooling device for inoculant, wherein the output end of the water cooling tank is located in a cooling box, a quick cooling box is arranged in the cooling box, a water collecting tank is connected to the lower part of the quick cooling box, the sidewall of the water collecting tank is connected with the input end of a circulating pump, an aluminum plate is arranged at the bottom of the quick cooling box, the outer side of the aluminum plate is connected with a refrigeration fin, and a leakage opening is arranged at the position where the aluminum plate communicates with the water collecting tank. The high-temperature inoculant can be cooled after water is injected into the water cooling tank, the water in the cooling process is discharged, the water collected in the conical tank is thrown into the quick cooling box, and finally falls on the aluminum plate of the quick cooling box. The water contacting the aluminum plate forms an ice layer, the continuously discharged water can be quickly cooled by heat absorption, the cooled water is continuously discharged into the water collecting tank, and finally is delivered into the water cooling tank through the circulating pump, so that the high-temperature inoculant melt is efficiently cooled, and the use cost of the equipment in the cooling process is lower.

The utility model provides a cooling device of a main transformer, which relates to the field of cooling equipment for the main transformer and comprises a transformer shell, the transformer shell is used for protecting a transformer core, and insulating oil and a cooling component are added in the transformer shell. Comprising cooling fins and a first fan which are used for cooling a transformer shell, a frame fixed to one side of the transformer shell, a coiled pipe, fins and a second fan which are used for cooling insulating oil, and a circulation assembly which comprises a circulation pump and a backflow pipe communicated with the transformer shell and the liquid inlet end of the circulation pump. According to the transformer temperature monitored by the thermocouple and the liquid level information monitored by the liquid level sensor through the PLC in the control assembly, the first electromagnetic valve, the second electromagnetic valve, the first fan, the second fan and the circulating pump are intelligently regulated and controlled through the relay and the frequency converter; therefore, operation parameters of the cooling device can be flexibly adjusted according to actual conditions, and the energy-saving effect is improved.

The utility model belongs to the technical field of PVC corrugated pipe processing, and particularly relates to PVC corrugated pipe surface embossing processing equipment which comprises an embossing machine, the front face of the embossing machine is fixedly connected with a water storage pond, the left side face of the water storage pond is fixedly connected with a controller and a refrigerating unit, a placing frame is arranged above the water storage pond, a spraying plate is arranged above the placing frame, and the spraying plate is fixedly connected with the controller. The inner wall of the water storage tank is fixedly connected with a stirring motor, a refrigerating frame and two heating pipes are respectively arranged in the water storage tank, the output end of the refrigerating unit penetrates through the water storage tank and is fixedly communicated with the outer surface of the refrigerating frame, and a temperature sensor is clamped on the bottom surface of the water storage tank. Water in the water storage pond is conveyed to the spraying plate, after spraying cooling of the PVC corrugated pipe is completed, water flows back to the water storage pond again, water resources are recycled, meanwhile, the temperature sensor monitors the water temperature in real time, the heating pipe, the refrigerating unit, the refrigerating frame and the controller are linked, and the water temperature is adjusted according to needs.

The invention discloses a petrochemical waste gas treatment device which comprises a pipeline for conveying waste gas, the pipeline comprises a straight pipe section, a throat pipe section and an output section, a tower spring-shaped circulating water pipe is arranged in the straight pipe section, the circulating water pipe is provided with a water inlet and a water outlet which extend outwards, and the inner diameter of the throat pipe section is smaller than that of the straight pipe section and that of the output section. A washing ring pipe is arranged on the outer wall of the throat pipe section, a plurality of nozzles are fixed to the circumference of the washing ring pipe in an array mode and penetrate through the pipe wall to extend inwards, the output section is communicated with the outer wall of the treatment tower, a particle capturing mechanism is arranged in the treatment tower, and the top of the treatment tower is communicated with a cyclone dust collector through a conveying pipeline. An exhaust pipe is arranged at the top of the cyclone dust collector; the petrochemical waste gas treatment device can effectively cool, dedust and desulphurize waste gas during use, prevents dust-containing and sulfur-containing waste gas from being directly discharged to influence the environment, and is suitable for popularization and use.

The utility model relates to electric motor car charging mouth technical field especially, relates to a kind of electric motor car charging interface waterproof sealing structure, including the car body for as structure main body, charging mouth is equipped on the car body, the charging head for the car body charging can be installed in the charging mouth, the protective shell for preventing water is installed in the charging mouth, the bottom of the protective shell is equipped with multiple ventilation openings for facilitating heat dissipation, the bottom of the protective shell is fixedly connected with connecting line.The utility model sets up protective shell and sealing plate, so that electric motor car can effectively protect charging mouth when not charging, when the car body needs to be charged, the sealing plate is separated from the protective shell by round plate pulling, at this time, the charging head is connected with the charging mouth, so that the sealing strip and the inner wall of the protective shell are matched, the connecting plate is attached to the protective shell, thereby completing waterproof protection of the charging head charging mouth, ensuring the waterproof effect of the charging interface.

The application discloses a kind of electric vehicle double battery switching endurance methods.The application is independently set by lead-acid battery group, lithium battery group on electric vehicle, respectively configure exclusive independent control switch, corresponding switch is manually operated and is started and stopped operation by key, the independent on-off and switching use of two groups of batteries are realized, the battery functions of two electric vehicles are combined, the endurance capability of electric vehicle is significantly improved.The method avoids existing automatic switching, parallel switching and other technologies, adopts pure manual independent switching mode, the structure is simple, convenient to operate, switching logic is clear, and endurance capability can be doubled through test verification, and through specific switch linkage design avoids circuit conflict in switching process, solves the drawbacks that double battery switching in existing technology is prone to power supply anomaly and cannot be switched stably, and is suitable for various electric bicycles, electric motorcycles and other electric vehicle models.

The air fryer comprises a machine body, a first hot air assembly, a second hot air assembly and a heat dissipation channel, the heat dissipation channel comprises a first heat dissipation channel and a second heat dissipation channel, the first heat dissipation channel communicates with the first hot air assembly, and the second heat dissipation channel communicates with the second hot air assembly; the first heat dissipation channel and the second heat dissipation channel share one first air outlet; at least partial area of at least one of the first hot air assembly and the second hot air assembly is arranged on the outer side of the machine body.

The application discloses a cable capable of dissipating heat in a high-temperature environment, which comprises an insulating rubber body, a second mounting area, a mounting groove, a first traction steel wire, a first conductor, heat-dissipating silica gel, a heat-dissipating opening, a heat-dissipating aluminum sheet, a heat-conducting silica gel sheet, heat-dissipating rubber, an outer insulating rubber and a heat-dissipating rubber column, a first steel wire hole is formed in the insulating rubber body, a first traction steel wire is arranged in the first steel wire hole, a first mounting area is formed in the insulating rubber body, six first mounting areas are formed, and every three first mounting areas form a group. The application has the advantages that the heat-dissipating performance is good, the conductor utilization rate is high, the performance-price ratio is high, the internal heat-conducting heat transmission performance is good, the heat-dissipating opening can effectively dissipate heat, and the traction steel wire can effectively protect the cable from being broken due to its own weight.

This utility model discloses a melting and casting device for recycling Babbitt alloy from a pear-shaped steel wire rope sheath. It includes a housing, a medium-frequency induction furnace housed within the housing, and a casting mold. The medium-frequency induction furnace comprises a furnace body, a capacitor box, and a power supply box. The furnace body has a hollow structure extending vertically, with a lifting port at the top and an open bottom. The furnace body is designed with three layers from the outside in: an outer layer of heat insulation plate, a middle layer of induction coils arranged in a spiral pattern using hollow copper tubes, and an inner layer of fireproofing mud. The power supply box is electrically connected to the capacitor box and the induction coils. The casting mold is located below the furnace body. Eddy currents are generated inside the pear-shaped steel wire rope sheath suspended in the furnace by the induction coils, generating heat to heat the sheath. When the heating temperature exceeds 230°C, the Babbitt alloy inside the sheath melts rapidly, forming a flowing liquid that drips directly into the casting mold below. Finally, it cools and is demolded, achieving effective recycling of the alloy.

This invention provides a water-filled cable trench and its laying structure, comprising: a main shell disposed in a mudflat section, the main shell having a receiving cavity; a wiring hole disposed on the main shell, the wiring hole communicating with the receiving cavity, through which the submarine cable passes through the main shell; and a water inlet disposed on the main shell, communicating with the receiving cavity, and the water inlet being located above the wiring hole. This design uses the main shell to form a receiving cavity for the submarine cable to pass through. During high tide, seawater submerges the main shell, and seawater enters the receiving cavity through the water inlet. The submarine cable passing through the receiving cavity is in direct contact with the seawater, which absorbs the heat emitted by the cable, thus aiding in heat dissipation. During low tide, the seawater leaves the mudflat section, but a certain amount of seawater remains in the receiving cavity. Therefore, the submarine cable remains surrounded by seawater and can still maintain effective heat dissipation through the seawater.

The utility model discloses a kind of transition flange structures with cooling function, it is related to flange technical field, including flange body, bearing, rotating shaft, refrigeration mechanism, spiral pipe, controller and temperature sensor, the inside of flange body is provided with rotating shaft, two bearings are provided on rotating shaft, oil storage cavity is formed between two bearings, spiral pipe and temperature sensor are provided in oil storage cavity, cooling chamber is opened in the side wall of flange body, water inlet and water outlet that are communicated with cooling chamber are opened on the side wall of flange body, refrigeration mechanism connects water inlet and water outlet, refrigeration mechanism and temperature sensor are connected with controller respectively. In the utility model, the cooling system of refrigeration mechanism, spiral pipe and cooling chamber, can effectively reduce the high temperature generated by bearing inner and outer ring and ball friction, prolongs the service life of bearing.

The application relates to the technical field of energy storage, in particular to an energy storage cabinet and an energy storage system comprising the same, which comprises a cabinet body, a door body rotatably connected to the cabinet body, and a battery cluster arranged in the cabinet body and stacked along a height direction, further comprising: an air inlet duct arranged on the inner side of the door body and used for air flow conduction with an air outlet of an air conditioner on the outer side of the door body, a flow guide duct configured at the bottom of the battery cluster and used for communication with the air inlet duct, and a backflow air duct formed between the battery cluster and a back plate of the cabinet body and communicated with the end of the flow guide duct; and a backflow port communicated with the backflow air duct is formed at the top of the cabinet body. Since one end of the air inlet duct connected with the air conditioner and the other end connected with the flow guide duct are distributed in a staggered manner along the horizontal direction, the non-orthogonal installation of the external air conditioner and the battery cluster can be effectively adapted, the structure is simple, and the overall heat dissipation requirement of the energy storage cabinet can be met.

This utility model relates to the field of component heat dissipation, providing a circuit board heat dissipation structure and a printing carriage. The circuit board heat dissipation structure includes: a heat sink with an internal circulating water channel, the circulating water channel having an inlet and an outlet connecting to the outside of the heat sink; a cold water tank, including an outlet and an inlet, the outlet connecting to the inlet and the inlet connecting to the outlet, the cold water tank being used to input a cold source into the circulating water channel and circulate the cold source from the outlet to the inlet; and a circuit board attached to the heat sink. The circuit board heat dissipation structure provided by this utility model can effectively dissipate heat from the circuit board, with excellent heat dissipation effect, and can extend the service life of the components on the circuit board.

The application provides a precision preformed soldering piece and a preparation method thereof. By arranging a graphene layer between the preformed soldering piece and a flux layer, the welding quality and efficiency can be improved, the energy consumption and environmental pollution in the welding process can be reduced, the welding strength and corrosion resistance can be improved, the oxidation and thermal stress in the welding process can be reduced, the cavity rate can be reduced, the precision can be improved, fullerene is added in the alloy raw material, the fullerene has high chemical stability and strong mechanical properties, can form strong bonding with rare earth metals, has high heat conduction performance, can effectively dissipate heat, avoids overheating of the welding part to cause failure, significantly reduces the cavity rate, improves the precision of the welding, reduces the welding temperature required by the preformed soldering piece, and has excellent oxidation resistance, which can effectively prevent the oxidation of the metal surface.