RU2042294C1 - Device for cooling computers - Google Patents

Abstract

FIELD: computer engineering. SUBSTANCE: device has pressurized box, condenser having cooled cap and upper parts of vertical walls of box, pipe for supply of cooling liquid to condenser, bottom where pipe for dielectric liquid supply is mounted. printed circuit boards with cooled semiconductors are arranged on inner sides of vertical walls of box. Heaters immersed in dielectric liquid are located near lower base of vertical walls and bottom of box. When heater are turned on, dielectric liquid is boiled, its vapor is condensed and dielectric liquid film flows over vertical walls of box. This results in cooling of semiconductor chips. EFFECT: decreased weight, decreased size, simplified design. 2 cl, 1 dwg

Description

 The invention relates to microelectronic equipment with a high integrated density of components and can be used in cooling systems of computers with high speed.

 A radio-electronic device is known, including vertically arranged boards with semiconductor crystals, cooled by a film of a dielectric liquid flowing down them. This device [1] is a sealed container containing a condenser in the form of finned tubes, a constant-level tank that acts as a film former, a board with chips, and a pump for pumping liquid into the film former.

 The necessity of using a pump in these systems is due to the fact that on the lower row of crystals the Reynolds number of the film in the absence of the pump can be less than a certain value of Re * due to the uneven distribution of the film along the length of the board and the possibility of film rupture at low Re numbers.

 The disadvantages of the known device are the design complexity and large dimensions due to the use of a condenser from finned tubes, a constant-level tank and a water pump.

 The closest in technical essence to the claimed one is a radio-electronic device with cooled vertical boards [2], selected as a prototype, containing a condenser in the form of finned tubes and condensate collectors located in the upper part of the cooled boards and forming a film of coolant on their surface.

 The disadvantages of the known device are the design complexity, large dimensions, inefficient use of condensate (some of which does not get into the collectors) and the low rate of runoff of the cooling liquid film.

 The purpose of the invention is the reduction of weight, dimensions and simplification of the design of the cooling device.

 The goal is achieved by the fact that in the electronic device, the functions of the capacitor and the film former are performed by the cooled lid and the upper part of the vertical walls of the sealed container. Circuit boards with semiconductor crystals are located on the lower sections of the vertical walls of the container along which the cooling film of liquid flows. To ensure a given Reynolds number on the lower row of crystals, heaters are used that are located at the bottom and at the bottom of the vertical walls inside the container and immersed in a dielectric fluid. The additional amount of steam generated on the heaters condenses in the upper part of the container and increases the necessary Reynolds number of the film flow.

 The drawing shows a variant of the electronic device.

 The device comprises a sealed container, consisting of vertical walls 1, 2, on the inner surfaces of which are mounting plates 3 with cooled semiconductor crystals, a capacitor 4, made in the form of a cover, the upper part of the vertical walls of the container having internal cavities for the circulation of coolant, pipeline 5 for supplying a condenser coolant, bottom 6, to which a conduit 7 for supplying a dielectric fluid is connected, heaters 8 located vertically at the lower base walls and at the bottom of the container 6 and immersed in a dielectric fluid.

 The device operates as follows.

 Through pipelines 7, the container is filled with dielectric liquid so that the heaters 8 are completely immersed in it, and all crystals 3 are above the liquid level. After the heaters 8 are turned on, the dielectric liquid boils, its vapor condenses on the walls of the condenser 4 and a liquid film forms there, which flows down the vertical walls of the container, cooling the semiconductor crystals and partially evaporating on them. Heaters maintain such a rate of liquid evaporation that the Reynolds number of the falling film corresponds to Re *, which is necessary to maintain a sufficient amount of heat transfer on the bottom row of semiconductor crystals. The crystals are switched on with a certain delay (several seconds), sufficient to form a liquid film.

 The second embodiment of the device differs from the first in that not only heaters, but also part of semiconductor crystals are flooded in the dielectric liquid. This allows you to use the heat generated by the flooded crystals to maintain a sufficient intensity of the boiling of the dielectric liquid and at some point turn off the heaters.

 The electronic device can be used, given its compactness and ease of maintenance, in the designs of supercomputers and other electronic equipment.

Claims (2)

 1. A RADIOELECTRONIC DEVICE containing a sealed container, the working volume of which is formed by interconnected bottom and side walls and which is partially filled with dielectric fluid, circuit boards with semiconductor crystals installed in the working volume of the sealed container in parallel planes above the level of the dielectric fluid, and a capacitor, located above the circuit boards, characterized in that the sealed container is equipped with heaters, which are located on its bottom at the lower bases of its side walls, and the condenser is made in the form of a hollow cover and hollow upper parts of the side walls of the sealed container, the cavities of which are interconnected and connected to the coolant supply and circulation system.  2. The device according to claim 1, characterized in that the circuit boards are partially recessed in the dielectric fluid.

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