专利汇可以提供EQUIPMENT COOLING专利检索,专利查询,专利分析的服务。并且Convection cooling channels are provided by means of an at least partially enclosed open cell metal foam structure for removing heat from equipment. In particular, an electronic equipment box is provided having walls comprising sections of open cell aluminium foam, clad with aluminium, through which air or other types of coolant may pass to remove heat from heat-generating components mounted thereon. Other types of equipment, such as electric motors, may be surrounded by customised sections of open cell metal foam, appropriately clad, through which a coolant may be channeled. The foam cell size may be adjusted according to desired coolant flow rate and weight considerations.Convection cooling structures may be combined with latent heat storage bodies comprising similar open cell metal foam structures containing wax, operating in tandem with the present convection cooling structures in a heat management solution.,下面是EQUIPMENT COOLING专利的具体信息内容。
This invention relates to cooling for equipment, in particular but not exclusively to the use of an open cell foam-filled ducting for convection cooling of electronic and other heat-generating equipment.
From a first aspect the present invention resides in an equipment cooling apparatus, comprising a structure formed at least in part by an open cell foam of a thermally conducting material, wherein the structure is arranged to enable a coolant to pass through the foam for removing heat conducted into the foam from equipment to be cooled.
The use of an open cell foam in such a cooled structure has been found to be particularly advantageous in that it provides a large surface area in contact with the coolant and the open cell nature of the material enables coolant to flow relatively easily through the structure.
An open cell foam structure may be formed or cut to any desired shape due to the structurally homogeneous nature of the open cell foam. For example the structure may be shaped to at least partially enclose or to fit closely to the surface of a piece of equipment to be cooled.
In one convenient implementation, the structure comprises a panel of the open cell foam arranged to provide a duct for the passage of the coolant. In a preferred embodiment, one or more such panels may be used to form walls or parts of a wall of a cooled equipment box, or they may be detached from the walls of the box to provide supplemental equipment cooling within the box. Alternatively, or in addition, the equipment box may further comprise a chimney, detached from the walls of the box, formed using the open cell foam to provide a supplementary passage for the coolant and for removing heat from equipment thermally linked to it.
In a further preferred embodiment, a panel of the open cell foam may be provided with one or more fans for propelling air through the panel, so forming a self-contained cooled panel for equipment thermally linked to it.
In designing a heat management solution, there are situations where cooling provided by structures according to this first aspect of the present invention may be insufficient, at least for short periods of time. Preferably, therefore, in the cooling apparatus according to this first aspect of the present invention, the structure further comprises an enclosed section formed using the open cell foam and containing a latent heat thermal storage material to provide a heat storage body, thermally linked to that portion of the structure arranged to pass the coolant. In this way, short term demands for higher levels of heat removal may be accommodated with help from the heat storage body while, during times of cooler operation, the cooled portion of the structure may be used to remove heat from the heat storage body. The heat storage body may contain a phase change material such as wax in which the wax would be allowed to set during a cooling phase. However, other types of latent heat thermal storage material may be used in the heat storage body, including solids such as metal hydrides, for example.
The open cell foam may be made using metals, such as aluminium or copper, or other materials with good thermal conductivity. The choice of material may depend upon weight considerations, required levels of thermal conductivity, expansion properties and mechanical robustness, to name but a few considerations. Furthermore, the size of the cells in the foam may be adjusted on the same or similar bases, taking account also of the nature of the coolant and the required rate of flow of the coolant through the open cell foam.
The coolant itself may take a number of different forms. Typically, air may be pumped or allowed to flow freely through the structure. However, other types of gas and various types of liquid may be used as coolants according to the particular cooling application.
Preferred embodiments of the present invention will now be described in more detail and with reference to the accompanying drawings, of which:
Preferred features according to a first embodiment of the present invention will now be described, with reference to
Referring to
Cladding or other types of divider may be provided between panels within or between walls 120-135 of the box 100 to direct or to increase the flow rate of coolant to selected panels, in particular to those having heat-producing components mounted thereon or otherwise thermally linked thereto. The relative positioning of holes or slots in the mounting surface of the base 105 and of dividers between panels may be arranged to provide for any desired route through the panels for coolant to flow. Coolant may for example enter one panel from the plenum chamber 105 and flow through that and an adjacent panel before emerging from the adjacent panel into a lid.
Sources of heat in an electronic circuit, e.g. power transistors 140, are shown in
Omitted from the view provided in
In the particular example of a box 100 in
Referring to
The box 200 is provided with one wall 205 comprising two open cell aluminium foam panels 210, 215 of differing thicknesses; the panel 215 having a greater thickness and hence of volume of open cell aluminium foam than the panel 210. A wall 220 of the box 200 is also provided with an open cell aluminium foam panel 225 similar in thickness to the panel 210, but the remainder of the wall 220 comprises a section 230 of aluminium sheeting, as do the other two walls 235 and 240 of the box 200. Four power transistors 245 are shown mounted on the inner wall of the panel 215 and three circuit boards 250 are shown in position within the box 200 with their mounting edges in thermal contact with the panels 210 and 225.
Whereas open cell aluminium foam panels have been shown to provide both walls and coolant channels in an electronic equipment box 200, further cooling may be provided by inserting an appropriately clad, open cell aluminium foam chimney 275 through the equipment box 200, as shown in section in
Referring in particular to
The increased surface area of open cell thermally conducting foams in comparison with alternative heat transfer features such as fins or pins placed in the path of a flowing coolant, makes for a more effective heat transfer device while providing high structural rigidity in a lightweight electronics equipment box. The open cell foam is suitable for use with air coolants or with liquid coolants such as water, although increased attention to the effective sealing of joints is required if liquid coolants are to be used, as would be apparent to a person of ordinary skill in the relevant art.
In situations where an equipment box is not required, but a more self-contained cooling arrangement is required, for example in the form of panel, a arrangement according to a third embodiment of the present invention may be used. This arrangement will now be described with reference to
Referring to
A further application of open cell thermally conducting foam to the removal of heat from equipment will now be described with reference to
Referring to
Of course, any shape of enclosure may be provided to completely or partially surround a source of heat with a structure functionally equivalent to that shown in
Whereas preferred embodiments of the present invention have been described as using open cell aluminium foam in particular, other metals and other materials, having good thermal conductivity, may be used for the foam and the cladding. For all embodiments, the choice of material (foam or cladding) may be varied to achieve different mechanical or thermo-mechanical properties such as strength, stiffness, coefficient of thermal expansion, etc. according to particular requirements of the application. For example, copper may be used where weight is not as critical. Furthermore, the cell structure may be altered to provide larger or smaller cell sizes according to the available surface area required for the transfer of heat to the coolant, the type and the required flow rate of coolant through the open cell structure and the resultant weight of the structure.
In providing a heat management solution, besides providing enhanced convention cooling by the techniques described above, it may be advantageous to incorporate one or more heat storage bodies into a cooling arrangement. A heat storage body, based for example upon a phase change material such as wax, may be used to accommodate short term higher levels of heat which may be beyond the capability of the convection cooling structure to handle without an undesirable increase in temperature of the cooled equipment.
Improved heat storage bodies have been developed by the present Applicant, making use of an open cell foam structure similar to that used in preferred embodiments of the present invention to spread heat more effectively through the phase change material. Such improved heat storage bodies are described in a co-pending patent application by the present Applicant.
Conveniently, a structure comprising thermally linked sections of open cell foam may be made initially without needing to decide which portions will carry a coolant for convection cooling and which portions will be filled with wax for heat storage. Having established the position of heat sources to be cooled, a corresponding arrangement of convection cooling and heat storage portions of the cooling structure may be designed and easily implemented. For example, an equipment box with walls made from isolated panels of open cell aluminium foam may be easily adapted to a particular application by using one or more panels as heat storage bodies and others as convection cooling ducts. One particular example of such an equipment box will now be described with reference to
Referring to
In addition to the walls of the box 500, further structures are provided within the box 500 to supplement the cooling provided by the walls 505-540. In particular, an additional panel 545 has been provided for the passage of coolant and a square-sectioned heat storage body 550 has been provided comprising an enclosure containing two portions 555 of open cell aluminium foam containing wax. The heat storage body 550 has been thermally bonded to the internal face of the panel 540 so that during a cooling phase of the heat storage body 550, heat may be conducted away by the cooled panel 540.
In principle, and as would be apparent to a person of ordinary skill in the relevant art, a cooled equipment box may comprise any desired combination of heat storage panels and coolant panels, with different panels having different sizes if required. Any combination of additional coolant carrying structures and heat storage bodies may be provided within the box, such as those (545, 550) shown in
While the use of cooled structures in combination with heat storage bodies, both formed using open cell foams of thermally conducting material, has been described in the context of an equipment box in this preferred embodiment of the present invention, any other type or shape of structure may be formed using such foam materials, appropriately enclosed, according to the physical requirements of the equipment to be cooled and overall heat management requirements. Structures such as that described above with reference to
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