Liquid cooling

Liquid cold plate

Liquid cold plate is through the structure of compact and relatively thin plate-like, strip metal internal layout of the fluid channel, so that the fluid and cold plate between the convection heat transfer, thereby dissipating the surface of the cold plate high power electronic components of the thermal power consumption. The application advantage of liquid cold plate depends on, unit area can dissipate more quantity of heat, consequently cold plate heat sink structure can miniaturize. Liquid cooling application refers to the use of liquid cooling plate (also known as water cooling plate) installed in the heat source, combined with heat exchanger and heat pump exchange, to dissipate heat in the way of fluid circulation. In general, cold plate technology is applied in the environment where forced convection or phase change system cannot achieve the heat sink effect and the heat energy density is very high. LORI thermal energy has recently strengthened the research and development of cold plate technology, especially in the liquid cooling product production process innovation, makes the liquid cold platee welding more stable, greatly reduces the water cooling plate leakage and other bad phenomena, improve the reliability of water cooling plate.

Cold Plate Technologies Include
Liquid cold plate process for manufacturing

Shallow buried pipe technology: it is suitable for single-side installation device. After flattening copper pipe and aluminum cold plate, it can mill the surface at the same time, which is fully conducive to the high thermal conductivity of copper pipe to take away heat, and the light weight of aluminum can reduce weight and cost control.

Deep buried pipe process: suitable for packing high thermal conductivity epoxy resin imported from the United States, double side device temperature difference requirements are not high, single and double side device installation, because the thickness of copper pipe without secondary processing, and packing protection can provide application safety, especially suitable for cold plate using refrigerant as medium.

Welding process: suitable for copper cold plate + copper heat pipe, so as to reduce the thickness of the plate to reduce weight.

Double-sided pipe clamping process: two-sided device installation, simple process and low cost; Aluminum cold plate + aluminum tube & copper tube & stainless steel tube.

Friction stir welding process: The process of friction stir welding is described as follows: it is a solid phase connection method under the action of mechanical force and friction heat. Friction stir welding process, a special convex shoulder and needle bar with the mixing head spinning slowly insert by welding, friction between the head and stir welding material shear resistance produced friction heat, the mixing head adjacent area of thermoplastic materials (welding temperature does not generally at and above the melting point of welding material), when the mixing head spin move forward, plasticizing of hot metal materials from the forefront of stir head backwards down the transfer, and the mixing head shoulder and workpiece surface friction heat and forging production, forming dense solid connection. liquid cold plate base material is AL6061.The cover plate adopts aluminum profile, and the fin of aluminum profile is used as the fin in the flow passage to form a whole after welding, and the heat dissipation results of both sides. Both heat dissipation efficiency and space saving are very effective. For IGBT,TEC and other areas with high power and high density, this is a good design choice. Through friction welding, a larger runner with the same thickness can be achieved than the buried copper pipe, and further reduce the thermal resistance. Especially in dealing with complex flow channels and some of the high and low flow channel is more flexible. As the overall material is basically the same after welding, more surface treatment methods can be selected, such as chromate, conductive oxidation, anode, nickel plating, etc.  

Liquid cold plate features

1. The highest cost performance;

2. Low cost, basically no mold expense is generated, and there is no limit on production volume;

3. High reliability, the channel is made of seamless copper pipe bent and inserted into the substrate groove. As long as the size control is reasonable, there is basically no risk of liquid leakage, and it can withstand pressure above 6kg/cm2;

4. Heating elements can be installed on both sides to minimize the structure;

5. Can be inserted into the copper pipe at the same time compressed, and do milling surface processing, so that the surface of the copper pipe exposed plane and substrate in the same plane, to achieve direct contact with heating elements and copper pipe, the heat quickly direct away.

Lori liquid cool solution and cold plate design

We are able to produce liquid cooling plates of various sizes and irregular shapes suitable for the special needs of different industries.

Through parallel water channel design, the liquid flow through the surface can be close to the temperature convergence to the outlet, thus reducing the temperature difference between parts, to achieve higher stability and reliability.

This cold plate continues to be buried copper tube water cold plate with the advantages of high cost performance, which provides another possibility for integrated optical path heat dissipation.

Tube type liquid cold plate can provide cost-effective cooling solutions, suitable for low to medium heat flux density requirements. Our tubular cold plate heat sink consists of copper or stainless steel piping mechanically hard-pressed into an aluminum-extruded substrate.

The rapid, efficient and precise size of laser cutting has been favored by many industries such as sheet metal processing, which plays a decisive role in China's industry 4.0 proposal. The greater the amount of cutting, the more power is needed and the more heat is generated. It is difficult to meet the heat dissipation requirement of laser with traditional air cooling.

At present, the main fiber lasers on the market are 200W,300W, 500W, 800W,1000W,1200W, 1500W and 2000W. In addition to 200W, almost all of them need cold plates to solve the corresponding heat problem. Our company has cooperated with many large laser companies, the quality is superior, the service is fast, can produce friction welding, buried copper pipe, deep hole drill, brazing and other kinds of liquid cold plate, especially buried copper pipe water cooled cold plate, the quality reaches the international advanced level.

Liquid cold plate applications

Medical imaging equipment is moving towards the direction of high precision, high-end equipment can not only allow people to breathe in the state of clear imaging, the future can be more remote diagnosis through the cloud platform, the quality of heat dissipation is directly related to the quality of the image.

The liquid cold plate is designed to maintain the low temperature required by the internal components through continuous liquid heat exchange through direct contact with the copper pipe. At the same time, the copper pipe of good welding, excellent sealing performance, so that customers less worry about leakage. The cold plate liquid cooling of medical equipment is not only a heat dissipation device, but also a delicate structural part.

Typical applications:

1. Transportation: electric locomotive, bullet train, electric drive ship, electric vehicle, etc.

2. Power transmission: uhvdc transmission, flexible dc transmission.

3. New energy: wind power generation and photovoltaic power generation.

4. Others: industrial frequency conversion, signal processing, UPS, medical treatment, laser, etc.

 

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