Heat exchange – With impeller or conveyor moving exchange material – Mechanical gas pump
Reexamination Certificate
1998-09-30
2001-05-15
Lazarus, Ira S. (Department: 3743)
Heat exchange
With impeller or conveyor moving exchange material
Mechanical gas pump
C165S135000, C165S067000, C123S041490, C416S195000, C180S068400
Reexamination Certificate
active
06230792
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to a device for attaching an accessory to a heat exchanger.
BACKGROUND OF THE INVENTION
The mounting of an accessory directly on the core of a heat exchanger is known. For example French Patent Application 2730009 describes the attachment of the motor of a motor fan unit to the radiator for cooling the engine of a motor vehicle.
In this document, the cooling unit of the exchanger is clamped between two groups of bearing elements by screws which pass through said unit through recesses provided in the fins between the tubes. Distance sleeves also pass through the unit in these same recesses to avoid a crushing of the fins, and raised shapes slightly deform these fins during the tightening of the screws to avoid any sliding of the motor in relation to the unit of the exchanger.
On the side of the exchanger where the motor is situated, the bearing elements are formed in a flange made of plastic material which is integral with the body of the motor. The raised shapes are produced in this flange in particular.
This arrangement is generally satisfactory. However, it cannot be used when the operating temperature exceeds a certain limit allowable by the plastic material of the flange. In such a case one is induced to produce a motor support made of steel. But in this case it is no longer possible to fix the support directly onto the aluminium fins because the risk of corrosion and deterioration of the mechanical connection.
The present invention aims to reduce these difficulties.
SUMMARY OF THE INVENTION
According certain embodiments to the present invention there is provided a unit comprising an accessory fixed to a heat exchanger comprising fins made of metal, especially aluminium, the said accessory being equipped with bearing surfaces designed to come to rest on the said fins, wherein the said bearing surfaces are formed on a steel accessory support integral with the said accessory, and wherein an electrically insulating material is placed between the bearing surfaces and the fins of the exchanger.
As the accessory support is made from steel it withstands any desired operating temperature. Furthermore, the risk of corrosion is averted by the presence of the electrically insulating material placed between the bearing surfaces made of steel and the fins made of metal, especially aluminium.
In a first embodiment of the invention, the said material is made in the form of an electrically insulating coating, covering the said bearing surfaces.
This electrically insulating coating may be of the paint or varnish type, which is applied in the liquid state. It may also occur in the form of an adhesive bonded onto the bearing surfaces. In these two cases, gripping protrusions may be provided, for example by stamping, in the portion of the accessory support forming the bearing surfaces.
In another embodiment, the electrically insulating material is in the form of blocks made of plastic material fixed to the said bearing surfaces.
The attachment of the blocks to the bearing surfaces may be performed by latching means cooperating on the block and on the accessory support.
The blocks advantageously comprise gripping protrusions on their face facing the fins of the exchanger.
The blocks may also comprise a sleeve designed to engage in a recess provided in the fins of the exchanger between the tubes, so as to form at least one distance sleeve portion.
REFERENCES:
patent: 1791924 (1931-02-01), Florman
patent: 3061277 (1962-10-01), Anderson
patent: 5289872 (1994-03-01), Kent
patent: 5348079 (1994-09-01), Tanaka
patent: 5441100 (1995-08-01), Ueda et al.
patent: 5522457 (1996-06-01), Lenz
patent: 5597038 (1997-01-01), Potier
patent: 5638894 (1997-06-01), Potier et al.
patent: 5771961 (1998-06-01), Alizadeh
patent: 5791402 (1998-08-01), Dumetz
patent: 5868197 (1999-02-01), Potier
patent: 4232019 (1993-10-01), None
patent: 183596 (1985-08-01), None
patent: 0 724 071 (1996-07-01), None
patent: 82788 (1985-05-01), None
Lazarus Ira S.
McKinnon Terrell
Morgan & Finnegan , LLP
Valeo Thermique Moteur
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