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For high-end electronic products, the cooling structure is required to take up as little space as possible. the weight of the lighter the better, the more reliable performance, the better, air cooling heat sink obviously unable to meet this requirement, the designers gradually change from air cooling heat sink to water cooling plate, the solution involves what process can be used to process the custom cold plate to achieve the design intention.
Currently, there are three options:
1. Heat pipe heat dissipation;
2.The aluminum plate buried copper pipe to form a channel heat dissipation;
3. One cold plate, directly milling groove in the aluminum plate , cover plate welding to form a channel. The above three water cooling plate design schemes are analyzed as follows:
Heat pipe heat dissipation: basically is in the vacuum of the tube body form self-cooling cycle, but the scheme can not do large cold plate, at the same time inconvenient maintenance.
Buried pipe heat dissipation: the production cost of buried pipe heat dissipation is relatively low. The grooves are milling out in the aluminum plate and buried into the copper pipe according to the grooves to form a closed channel. The copper tubes and aluminum plates are filled with a gelatin.The scheme can meet the requirements of heat dissipation, but the disadvantage is that a large heat dissipation interval cannot be formed locally and it cannot meet the requirements of heat dissipation of some structural parts.
Integral cold plate: direct groove in the aluminum plate, plate welding forming channel, this needs to choose a kind of welding process on base plate and the cover plate sealing, preliminary selection of brazing process, brazing solder are the shortcomings of easy to loss, loss of solder may clog waterways, loss of the position of the solder will appear the phenomenon of not welded, led to the channel leakage.The yield is subject to manual proficiency, sense of responsibility, consistency of solder and control of the temperature in the furnace. The yield is about 80%.Too many uncertainty factors lead to the use of this process welding liquid cold plate is not reliable, especially on the important structure is rejected this process.
Because of the unreliability of the brazing process, the radar electronic heat sink has sought for the friction stir welding process to produce the aluminum cold plate. The friction stir welding process has shown its incomparable advantages in this product:
1. Welding under normal temperature without groove opening, filler, vacuum or gas protection;
2. Pleasant working environment, no noise, arc and radiation during welding;
3. High yield, numerical control operation, independent of manual proficiency;
4. High efficiency, with the same material and correct parameters, the yield is 100%.
The way of water cooling plate will replace the air cooling heat sink , and friction stir welding process will be favored by the structural designer with incomparable advantages!
1. The requirements of the indoor temperature: when the projector heat sink heating in winter indoor temperature should be controlled at not less than 18 ℃, the average indoor temperature to achieve 16 ℃, but for the elderly and children, 16 ℃ standard is relatively low, but also shoulds not be too high, too high can let a person have the feeling of discomfort, and indoor and outdoor temperature difference is too large to cause colds and other diseases.
5. Decorate heat sink: decorate projector heat sink should consider to maintain, open hole area should with whole group heat sink can disassemble lift advisable.And adornment component should be mobile type, when heat sink appears problem, can lift conveniently, reveal whole conduit gas slice. The opening of the valve of the riser and branch pipe shall have space for disassembling and replacing the valve.
This is the most common way to dissipate heat. Aluminum fins are used as part of the led heat sink to increase the area of heat dissipation.
Heat-conducting plastic heat sink
Using LED insulation heat dissipation plastic instead of aluminum alloy to make heat dissipation body, can greatly improve the heat radiation ability.
Surface radiation heat dissipation treatment
The surface of the led heat sink do radiation heat treatment, simple is to apply radiation heat paint, can be taken away from the surface of the with radiation.
Air hydrodynamics.
The shape of the led light heat sink is used to create convection air, which is the lowest cost way to enhance heat dissipation.
Fan
Inside the led heat sink, long-life and high-efficiency fan is used to enhance heat dissipation.However, changing the fan is troublesome and not suitable for outdoor use, which is a rare design.
Heat pipe
Heat transfer tube technology is used to channel heat from LED chip to heat sink cooling fin. Large led lights, such as street led lights, are common designs.
Liquid ball bubble
The transparent liquid with high thermal conductivity was filled into the bulb of the led light body by using liquid bulb encapsulation technology. This is in addition to the reflective principle, the only use of LED chip surface heat conduction, heat dissipation technology.
Use of led light holder
In the home type of small power LED light, often use the internal space of the led light cap, the hot drive circuit part or all put in.This can be used as a screw cap such as a larger metal surface of the led light, because the cap is closed to the base of the metal electrode and power line. So some of the heat can be derived from that.
Integration of heat conduction and heat dissipation -- application of high heat conduction ceramics
The purpose of heat dissipation of led heat sink is to reduce the working temperature of LED chip. Due to the large gap between the expansion coefficient of LED chip and the thermal conductivity and heat dissipation coefficient of metal commonly used, the LED chip cannot be directly welded to avoid the damage of LED chip by high and low temperature thermal stress. The latest high thermal conductivity ceramic materials, thermal conductivity close to aluminum, expansion system can be adjusted to sync with the LED chip. In this way, heat conduction and heat dissipation can be integrated to reduce the intermediate link of heat conduction.
High performance Cold Plate has been developed by Friction Stir Welding Porcess; The Copper pipe was embedded in the machined groove of aluminum base plate by using Friction Stir Welding , thermal performance of the Cold Plate are approximately 30% higher than that of the conventional Cold Plate fixed by bolts. Strong bonding between copper and aluminum was established by optimizing the Friction Stir Welding conditions. Lori Quality Engineering was used to seek optimum robust conditions of Friction Stir Welding. Eight control factors were selected from Friction Stir Welding conditions and dimensions of the parts, and noise factors were determined by the gap between the copper pipe and groove of the aluminum base plate. SN ratios of eighteen welded specimens were calculated by thermal performances of specimens. The factorial effects graph was considered from the data of the SN ratios of 18 combinations, the optimum condition was determined by choosing the control factors that had the highest SN ratio. Stable and higher thermal performance was obtained because the Cold Plate was produced under optimum robust condition, even if there were large gaps between copper pipe and aluminum groove before Friction Stir Welding. The Quality Engineering is very effective to seek robust production conditions, many variety of high performance Liquid Cold Plates have been manufactured in short preparation period based on this technique in our company.
Some time ago, many countries have issued a ban on fuel cars timetable, for new energy vehicles is undoubtedly a great benefit, but also to the development of new energy vehicles into a strong power, so the development of new energy vehicles in the future is what? the following cold plate heat sink experts for everyone analysis.
For the development of new energy vehicles, the Chinese government is undoubtedly the most powerful in promoting the development of energy saving and new energy vehicles (2012-2020), which points out that the production capacity of pure electric vehicles and plug-in hybrid electric vehicles in China will reach 2 million by 2020, and the cumulative production and sales volume will exceed 5 million. According to the statistics of water-cooling radiator experts, by the end of 2017, China's new energy vehicle ownership reached 1.53 million, according to the planned development space, the future growth rate will be greater.
In the future, policies on new energy vehicles will be more reasonable. The plan of withdrawing fiscal subsidies for electric vehicles in 2020 has been determined, and the dual-point policy for new energy vehicles will be formally implemented soon. Measures will continue to be taken to expand the sales quota of new-energy vehicles, explore new markets for Shared cars, and improve the construction of charging facilities. In addition to subsidy policies, technical standards on the comprehensive capacity and emission of new energy vehicles will also be improved. Water cooled plate experts also pointed out that the policy innovation for new energy vehicles will be further promoted. In the future, policies will be guided from the perspectives of carbon trading system, electricity price reform, business model innovation, automatic driving planning layout, and diversified power sources.
New energy vehicle technology innovation will become the focus. New energy vehicles pure electric and intelligent is the future of the most important direction of development, in addition to the water cooling radiator experts think the industry will further increase the research and development of fuel cell engine, fuel powered cars will become in addition to power battery cars a bright spot. The future of new energy vehicles will also be combined with the implementation of major artificial intelligence projects, the development of intelligent networking, automatic driving technology platform. New energy vehicles will also evolve into mobile personal application space and interactive terminals. It can be seen that intellectualization will be an important feature of new energy vehicles in the future.
The market for new energy vehicles is very broad.The innovative development of emerging business models such as Shared cars and self-driving rentals will greatly promote the popularization of new energy vehicles. New energy vehicle enterprises will also gradually transform from a single provision of automobile products to a combination of products, services, charging, operation and other links and a new business model. New energy vehicle will develop into a systematic thing.
The development of new energy vehicle related facilities will be more complete. Charging ways, charging interface will form a unified standard further, new energy vehicle in electricity infrastructure system in field of private and public charging charging pile pile will maintain steady growth, the unit interior than charging infrastructure construction to speed up the pace, regional car pile will be further optimized, charging service platform that integrates development, accelerates the development of intelligent at the same time, can be activated at the same time the application of new energy, new energy and form a good interaction.