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Attachment method between heat exchanger partsRelated Patent Categories: Metal Working, Method Of Mechanical Manufacture, Heat Exchanger Or Boiler Making, Tube Joined To Flat Sheet Longitudinally, I.e., Tube SheetAttachment method between heat exchanger parts description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060196051, Attachment method between heat exchanger parts. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION(S) [0001] Not applicable. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not applicable: REFERENCE TO A MICROFICHE APPENDIX [0003] Not applicable. TECHNICAL FIELD [0004] The present invention relates to a process for assembling a heat exchanger, and more particularly to a process for attaching fixtures to the header pipe. BACKGROUND OF THE INVENTION AND TECHNICAL PROBLEMS POSED BY THE PRIOR ART [0005] Heat exchangers for air circulating systems of automobiles, for example, are constructed with a header pipe installed on the heat exchanger core which has cooling fluid tubes and cooling fins. The brackets and other inlet/outlet fixtures for cooling liquid are initially attached to the header pipe on a heat exchanger frame during the assembly of such components, after which they often are permanently attached to the header pipe through brazing, while cladding material is applied. [0006] Various technical suggestions have heretofore been proposed to assist in initial assembly fo such heat exchangers. Korean Practical New Device Registration Number 10-1996-38332, for example, suggests creating a conjunctional vacuum between the tank of the header pipe and the bracket as they are aligned, including riveting after a rivet is inserted into the conjunctional vacuum. Korean Practical New Device Registration Number 10-1996-67450 has also suggested creating a conjunctional vacuum between the tank of the header pipe and the bracket as they are aligned. While maintaining this vacuum, the bottom portion of a conjunctional material is inserted into the tank or the bracket, and then is tightly fixed. [0007] The above technical suggestions can be advantageous when used with thin brackets and fixtures. However, they become problematic when the rivets and the conjunctional materials are applied to thick fixtures. In addition, since the rivet and the bottom portion of the conjunctional material are exposed on the exterior, it damages the external appearance. [0008] According to another technical suggestion, the header pipe is TIG welded to the header pipe and the other fixtures including brackets. However, with this method, if the electrical current fluctuates during the welding, the depth and the height of the bead will change, creating a problem with the bracket coming off during the core brazing. Moreover, in the case of large fixtures in which the entire circumferences of more than two parts must be welded, the cost of the method can be high. [0009] The present invention is directed toward overcoming one or more of the problems set forth above. SUMMARY OF THE INVENTION [0010] In one aspect of the present invention, a process of connecting a header pipe of a heat exchanger to another heat exchanger part is provided, including the steps of (a) providing a header pipe with a hole in its side and cladding material about its circumference, and a part with a groove with flux applied to the portion of the part to be joined to the header pipe, (b) positioning the header pipe and the part to align the header pipe hole and part groove, (c) inserting a rivet into the aligned header pipe hole and part groove, (d) locating a supporting rod in the header pipe and aligned with the rivet, and (e) hammering the part to warp the head of the rivet against the supporting rod and widen the circumference of the rivet in the hole and groove. [0011] In one form of this aspect of the present invention, the hammering step also compresses the rim of the header pipe hole. [0012] In another form of this aspect of the present invention, the supporting rod has a curved surface at its contacting point to the rivet during the hammering step. [0013] In still another form of this aspect of the present invention, 1/5 to 1/2 of the length of the rivet is in the part groove before the hammering step. In a further form, the depth of the part groove is in the range of 1/5-1/2 of the entire length of the rivet before the hammering step. [0014] In yet another form of this aspect of the present invention, the rivet is one of a plain rivet, a round headed rivet and a rivet with knurling on the end in the part groove. [0015] In still another form of this aspect of the present invention, the rivet is round headed, and the supporting rod has a concave groove corresponding to the rivet round head at the portion that contacts the head of the rivet during the hammering step. [0016] In another aspect of the present invention, a process of connecting a header pipe of a heat exchanger to another heat exchanger part is provided, including the steps of (a) forming (I) a hole in the header pipe with cladding material about the hole circumference, and (ii) a groove in the part with flux applied to the portion of the part to be joined to the header pipe, (b) aligning the header pipe hole and the part groove with a rivet inserted in the aligned header pipe hole and part groove, (c) locating a supporting rod in the header pipe, and (d) hammering the part to warp the head of the rivet against the supporting rod and widen the circumference of the rivet in the hole and groove. BRIEF DESCRIPTION OF THE DRAWINGS [0017] FIG. 1 is a cross-sectional view of a header pipe and part adapted for assembly according to the method of the present invention; Continue reading about Attachment method between heat exchanger parts... Full patent description for Attachment method between heat exchanger parts Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Attachment method between heat exchanger parts patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Attachment method between heat exchanger parts or other areas of interest. ### Previous Patent Application: Manufacturing method for cooling unit, cooling unit, optical device, and projector Next Patent Application: Modular heat exchanger having a brazed core and method for forming Industry Class: Metal working ### FreshPatents.com Support Thank you for viewing the Attachment method between heat exchanger parts patent info. 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