WO2020067927A1

WO2020067927A1 - Method for cooling screen modules via a supporting surface

Info

Publication number: WO2020067927A1
Application number: PCT/RU2019/000681
Authority: WO
Inventors: Алексей Викторович ШТОРМ
Original assignee: Алексей Викторович ШТОРМ
Priority date: 2018-09-27
Filing date: 2019-09-26
Publication date: 2020-04-02
Also published as: RU2018133976A

Abstract

The invention relates to the field of cooling devices or heating devices (F21V 29/00). The present method for removing excess thermal energy from screen modules is characterized in that thermal energy is transferred from screen modules onto a supporting surface via one or several thermally conductive films disposed between the screen modules and the supporting surface. The supporting surface is cooled by means of cooling channels having a heat transfer agent therein, said channels being disposed within the supporting surface. The heat transfer agent is heated by the walls of the channels as said agent moves through said cooling channels, and then exits outward, thus carrying excess thermal energy away with it. A gas or a liquid can be used as a heat transfer agent. The supporting surface can be composed of one or more thermally conductive profiles. The thermally conductive profiles can be made of metal or plastic using an extrusion method. The present invention aims to solve the problems of: efficiently removing heat from screen modules; allowing the easy replacement of screen modules without decreasing cooling efficiency; allowing the efficient cooling of modules for thin two-sided screens; providing simplicity in manufacturing; decreasing the mass and the dimensions of a screen by means of an efficient system for removing heat from modules.

Description

The method of cooling the screen modules through the carrier

surface

The invention relates to the field of cooling or heating devices (F21V 29/00

A cooling plate for an LED display is known from the prior art (CN201355892Y, H05K 7/20, 02/02/2009). The device is a cooling plate, which is mounted on the rear surface of the LED module circuit board using bolts, the plate can be made in the form of a metal radiator with fins. This design improves the cooling of the screen modules. Disadvantages: a large mass of the product due to the installation of cooling plates on each board; the need for manual installation of radiators using bolted connections; low cooling efficiency with radiators at high ambient temperatures.

A cooling device is known in the art.

LED display (CN201363702Y, F21V 29/00, 01/13/2009).

It is characterized by the presence of: a radiator located on the outside of the display housing, a heat sink located in the housing of the LED display and mounted on the back of the LED surface of the display, a circulation pump connected to the inlet pipe

heat sink and radiator exhaust pipe, and a fluid reservoir;

cooling the display surface by circulating

coolant between the heat sink and the external radiator. Disadvantages: the use of liquid for cooling complicates the manufacture and maintenance of such displays; liquid cooling system significantly increases the mass of the display; liquid cooling equipment is much more expensive than air cooling systems.

From the existing level of technology is known cooling system based on electro-hydrodynamic gas flow (US20100177519A1, F04B17 / 00, 01/23/2006). The invention relates to cooling systems and, in particular, to cooling systems providing forced convective gas flow for heat dissipation from LEDs. The cooling system uses a heat sink in combination with an EHD pump, which can use phenomena such as corona wind or micro-scale corona wind. An array of cooling channels can be used to realize heat dissipation from LEDs. Minuses: to create the necessary air flow, it is necessary to create high voltages of tens of kilovolts, due to the high voltage, the installation can be dangerous to humans; The efficiency of the EHD pump is low due to the expenditure of part of the energy on the formation of microvortices; the difficulty of using the device in outdoor conditions due to high dust and high humidity, which can lead to electrical breakdown of air with a high voltage.

A prior art device is known for removing heat in a display device (RU 2586451, F28D1 / 02, 05/13/2014). The essence of the invention lies in the fact that the display device includes a display panel; and a heat diffusion module having a plate shape corresponding to a display panel for supporting a rear surface of the display panel, wherein the heat diffusion module includes at least one plate-shaped heat diffuser, wherein at least one heat diffuser includes a working fluid introduced into at least one heat dissipator and at least one channel provided within at least one

heat diffuser for directing the working fluid. Disadvantages:

the presence of fluid complicates the production and maintenance of the device; there is no device that allows you to hold the panel on a bearing surface; the device is not very effective when used with a double-sided screen that has great heat dissipation.

Modern street LED screens emit a lot of energy in the form of heat from 300 watts to 1000 watts per square meter. In order to

LEDs did not fail prematurely, their temperature should not exceed 70 degrees Celsius.

Conventional LED screens are cooled by massive

fans installed inside cabinets with LED modules. There are also solutions with liquid-cooled modules, when the thermal energy is first removed from the LED modules using a liquid coolant, and then the coolant is cooled or

Condensed in a heat exchanger using a fan. Such solutions increase the thickness and weight of the screen.

Since street screens can reach hundreds of square meters, the mass of such screens can reach several tons. The large thickness and mass of the screen lead to an increase in the size of the supporting structures, to an overspending of materials and an increase in the cost of the entire screen as a whole. The cost of supporting structures can reach 30% of the cost of the LED screen itself. In order to create thin double-sided screens with a minimum weight, existing solutions are not suitable, new methods of removing heat from LED modules are needed.

The tasks to which this invention is directed are: providing effective heat removal from the screen modules; enabling easy module replacement without sacrificing efficiency

cooling; enabling efficient cooling of modules for thin double-sided screens; simplicity of manufacture; reduced weight and dimensions of the screen due to the effective system of heat removal from the modules.

The tasks are solved as follows

The method of removing excess thermal energy from the modules (1) of the screen is implemented as follows. One or more removable screen modules (1)

placed on a bearing surface (4). Thermal energy is transferred from the modules (1) of the screen to the bearing surface (4) through one or more heat-conducting films (3) placed between the modules (1) of the screen and the bearing surface (4). The heat-conducting films (3) can have ferromagnetic properties, and the modules (1) of the screen are held on the bearing surface (4) due to the forces of magnetic attraction between one or more fragments of the heat-conducting film (3) attached to the modules (1) of the screen, and one or more fragments of a heat-conducting film (3) attached to a bearing surface (4). Thus, it is possible to easily replace the modules (1) of the screen without reducing the cooling efficiency. The modules (1) of the screen can be removed and installed on the bearing surface (4) without damaging the heat-conducting film (3) and without affecting the heat removal efficiency, in contrast to standard solutions, where

the heat-conducting film is glued on both sides, on the one hand to the heat-generating structure, on the other hand to the heat dissipation device.

The bearing surface (4) may be a monolithic plate with cooling channels (5) inside, or the bearing surface (4) may consist of one or more heat-conducting profiles, with cooling channels (5) inside. The bearing surface (4) is cooled by one or more cooling channels (5) located inside it. The heat carrier in the process of its movement through the cooling channels (5) is heated from the walls of the cooling channels (5) and goes outside, taking with it the excess thermal energy. As a heat carrier, gas or liquid can be used. Cooling can be done by natural convection.

the coolant inside the cooling channels (5) or by forced pumping of the coolant inside the cooling channels (5). This ensures efficient heat removal from the modules (1) of the screen. The modules (1) of the screen can be placed on both sides of the bearing surface (4), thus providing effective cooling of the modules (1) of the screen for thin double-sided screens.

Simplicity of manufacture is ensured by extrusion of profiles of the bearing surface (4), with further sticker on their surface of a heat-conducting film (3). These operations are well mastered by the industry and have a low cost.

Reducing the mass and dimensions of the screen is ensured by an effective system of heat removal from the modules (1) of the screen, which does not require

direct blowing of the modules (1) of the screen using fans.

Brief Description of the Drawings

The figures (1-5) show the elements of the screen and their layout in one-sided and two-sided embodiments of the screen.

List of Shapes

1. Screen module with heat-conducting film, rear view.

2. Bearing surface with heat-conducting film, front view.

3. Bearing surface with modules, spaced front view.

4. The bearing surface with a double-sided arrangement of modules,

exploded front view.

5. Bearing surface with double-sided arrangement of modules, front view.

List of items depicted in the figures

1. Screen module.

2. The light-emitting surface of the module. 3. Heat transfer film.

4. The bearing surface, consisting of a set of profiles.

5. The cooling channel.

Device

The screen consists of a bearing surface (4) and modules (1) of the screen placed on this. The bearing surface (4) may be a monolithic plate with cooling channels (5) inside, or the bearing surface (4) may consist of one or more heat-conducting profiles, with cooling channels (5) inside. The bearing surface (4) is cooled by one or more cooling channels (5) located inside it. The modules (1) of the screen can be placed on both sides of the bearing surface (4). One or more removable screen modules (1) are placed on a bearing surface (4). The modules (1) of the screen at the rear and the bearing surface (4) in front are covered with fragments of a heat-conducting film (3) attached to the modules (1) of the screen and the bearing surface (4) so that they are in close contact with each other.

The device is manufactured as follows:

The bearing surface (4) consists of one or more profiles, which can be made of various materials. Profiles can

made by extrusion of plastic or metals (aluminum, copper, etc.). The cooling channels (5) are formed inside the bearing surface (4) during the extrusion process. If the profiles are made of polymer, they are added to the polymer to improve the heat-conducting properties.

thermally conductive particles (metal particles, carbon fibers or

carbon nanotubes).

Thermal conductive films are made by standard industrial methods from polymers (for example, silicone or vinyl) with the addition of heat-conducting particles (metal particles, carbon fibers or carbon nanotubes). A heat-conducting film (3) is applied on the front surface to the front. The heat-conducting film (3) can also be applied to the rear modules (1) of the screen. The heat-conducting film (3) can be applied by gluing film fragments (3) to the surface or by

spraying a special heat-conducting composition onto the surface, followed by curing (polymerization). Modules (1) of the screen can be manufactured using any

existing industrial technology.

The operation of the device is as follows:

The modules (1) of the screen during their work emit thermal energy. This thermal energy is transmitted through heat-conducting films (3) to the bearing surface (4). In this case, the bearing surface (4) heats up and transfers thermal energy to the heat carrier, which passes through the cooling channels (5). The coolant exits the bearing surface (4), taking with it the thermal energy.

The coolant can circulate (rise up the cooling channel (5)) due to thermal convection. The coolant can be pumped through the cooling channels (5) using fans (in the case of gas) or pumps (in the case of liquid). In the simplest version, ordinary ambient air is used as a coolant, which is pumped by fans through cooling channels (5) located inside the bearing surface (4).

Claims

Formula

1. The method of removal of thermal energy from the screen modules is characterized in that one or more removable screen modules are placed on a carrier

surface, while thermal energy is transferred from the screen modules to the bearing surface through one or more heat-conducting films placed between the screen modules and the bearing surface, the bearing surface is cooled by one or more cooling channels located inside it, the coolant in the process of its movement through the cooling channels heats up from the walls of the channels and goes outside, taking with it the thermal energy.

2. The method of removing thermal energy from the screen modules according to claim 1 is characterized in that the heat-conducting films have ferromagnetic properties, and the screen modules are held on the supporting surface due to magnetic forces between one or more film fragments attached to the screen modules, and one or more film fragments attached to a bearing surface.

3. The method of removing thermal energy from the screen modules according to claim 1 is characterized in that gas is used as a heat carrier.

4. The method of removing thermal energy from the screen modules according to claim 1 is characterized in that a liquid is used as a heat carrier.

5. The method of removal of thermal energy from the screen modules according to claim 1 is characterized in that the cooling is carried out by natural convection

coolant inside the cooling channels.

6. The method of removing thermal energy from the screen modules according to claim 1 is characterized in that the cooling is carried out by forced pumping of the coolant inside the cooling channels.

7. The method of removing thermal energy from the screen modules according to claim 1 is characterized in that the supporting surface consists of one or more heat-conducting profiles with cooling channels inside.

8. The method of removing thermal energy from the screen modules according to claim 1 is characterized in that the screen modules can be removed and installed on the bearing surface without damaging the heat-conducting film and without deteriorating

heat sink efficiency.

9. The method of removing thermal energy from the screen modules according to claim 1 is characterized in that the screen modules are placed on both sides of the bearing surface.