| Heat exchanger -> Monitor Keywords |
|
|
  Heat exchangerRelated Patent Categories: Heat Exchange, Radiator Core Type, Deformed Sheet Forms Passages Between Side-by-side Tube Means, With Tube ManifoldHeat exchanger description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060237178, Heat exchanger. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a heat exchanger, wherein fins are formed integral with a heat transfer plate constituting internal passages through which flows a heat exchanging fluid and, for example, useful for a vehicle air conditioner. [0003] 2. Description of the Related Art [0004] In the prior art and, for example, in Japanese Unexamined Patent Publication No. 11-287580 (first patent document), a heat exchanger has been proposed wherein a plurality of rib sections, constituting internal passages through which passes a heat exchanging fluid, are formed integral with a heat transfer plate and operate as turbulence generators for disturbing a straight flow of air stream flowing on the outside of the heat transfer plates. [0005] According to this structure, as an air-side heat transfer rate is improved by forming turbulence in the air stream, it is possible to eliminate fin members such as the corrugated fins in the conventional fin and tube type heat exchanger. Thus, the heat transfer plate could be produced solely by press-forming and brazing heat transfer plates. [0006] Also, in Japanese Unexamined Patent Publication No. 2002-147983 (second patent document), as shown in FIG. 27, a heat exchanger is proposed wherein a plurality of rib sections 14, for constituting internal passages 15 for a heat exchanging fluid, are formed integral with a heat transfer plate 12, and a base plate section 13 having a flat surface is formed between the rib sections 14 adjacent to each other and fin sections 17, projected toward an air passage 18, are provided on the base plate section 13. Also, in this second patent document, the fin members, such as corrugated fins, are not fixed to the heat transfer plate 12. [0007] In this prior art, as the plurality of rib sections 14 constituting the internal passages are disposed at the same positions as seen in the air flowing direction A, the rib sections 14, 14 in the adjacent heat transfer plates 12, 12 are directly opposed to each other while interposing the air passage 18. [0008] As a result, an area S1 of the air passage 18 at a position forming the base plate section 13, that is, at a position forming the fins 17 reduces to S2 at a position forming the rib section 14. Accordingly, in this prior art, the air passage 18 repeats the reduction and enlargement of the cross-sectional area in accordance with whether or not the rib section 14 exists. [0009] In this regard, in Japanese Unexamined Patent Publication No. 11-287580, while a local heat transfer rate in the vicinity of the rib section is better than in the conventional fin and tube type heat exchanger, the air-side heat transfer area becomes insufficient, whereby there may be a case that a necessary heat transfer performance cannot be ensured. [0010] Also, in the heat transfer plate, as the base plate section having no rib section forms a flat surface extending in the air-flow direction, a temperature boundary layer grows on this flat surface to lower the local heat transfer rate to a great extent. This is also a cause for the deterioration of heat transfer performance. [0011] To ensure the necessary heat transfer performance, it is necessary to increase the number of heat transfer plates. However, as the heat transfer plate has a large wall thickness for maintaining the required pressure resistance in comparison with the fin member, the total weight of the heat exchanger increases. Also, as the material cost of the heat transfer plate increases, the production cost of the heat exchanger becomes high. [0012] In the second patent document, as the air passage 18 repeats the reduction and enlargement of the cross-sectional area in accordance with whether or not the rib section 14 exists, a pressure loss in the air-stream increases. [0013] According to the second patent document, as gaps between tops of the rib sections 14 directly opposed to each other via the air passage 18(the portions having the area S2) are arranged on a straight line in the air flowing direction A, a main air stream linearly passes a portion having a reduced area S2 as shown by an arrow E. [0014] Therefore, in the base plate section 13 constituting the enlarged portion having the passage area S1 in the heat transfer plate 12, a region F in which air stream dwells is formed along the surface of the base plate section 13, which significantly deteriorates the heat transfer rate on the surface of the base plate section 13. [0015] In the second patent document, as the main stream of air moves straight past the portion having the reduced area S2 as shown by an arrow E, unless the fin 17 is projected into the gap through which the main stream E passes, it does not serve to improve the heat transfer performance. [0016] Accordingly, in the second patent document, it is necessary that a height of the fin 17 is higher than a height of a top of the rib section 14, which forces the metallic material forming the heat transfer plate 12 to be excessively stretched during the machining of the fin 17. Accordingly, it is difficult to machine the fins 17. [0017] Also, if the fin 17 is made to be higher than the top of the rib section 14, in a process of assembling the heat exchanger, the fin 17 is liable to collide with a peripheral member and be damaged. SUMMARY OF THE INVENTION [0018] In view of the above problems in the prior art, an object of the present invention is to improve the heat transfer performance of the plate type heat exchanger in which separate fin members are not combined with heat transfer plates constituting internal passages, without increasing the number of heat transfer plates. [0019] Also, another object of the present invention is both to improve the heat transfer performance of the plate type heat exchanger of this kind and to facilitate the production of the heat exchanger. [0020] To achieve the above objects, according to the inventive heat exchanger, a plurality of heat transfer plates (12) forming plate surfaces extending in the flow direction (A) of an external fluid are stacked perpendicular to said plate surfaces, [0021] a gap is provided between said plate surfaces of said adjacent heat transfer plates (12) to form an external passage (18) through which said external fluid flows, [0022] a plurality of rib sections (14) extending orthogonal to the flowing direction A of said external fluid are projected from said plate surfaces into said external passage (18) to be integral with said heat transfer plates (12), Continue reading about Heat exchanger... Full patent description for Heat exchanger Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Heat exchanger 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 Heat exchanger or other areas of interest. ### Previous Patent Application: Counter-stream-mode oscillating-flow heat transport apparatus Next Patent Application: Reduced vibration tube bundle device Industry Class: Heat exchange ### FreshPatents.com Support Thank you for viewing the Heat exchanger patent info. IP-related news and info Results in 0.56664 seconds Other interesting Feshpatents.com categories: Computers: Graphics , I/O , Processors , Dyn. Storage , Static Storage , Printers |
||
