Abstract:
Disclosed is a heat exchanger tube for transferring heat due to combustion of a combustor toward an exterior, the heat exchanger tube comprising: an insertion body which is configured by folding up three or more sectors made of aluminum through extrusion molding; and an accommodation body which is configured to accommodate the insertion body so that an inner circumferential surface can be in contact with an outer circumferential surface of the insertion body, thereby maximizing a surface area and improving an efficiency of transferring heat.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority to and the benefit of Korean Patent Application No. 10-2013-0098292 filed in the Korean Intellectual Property Office on Sep. 4, 2013, the entire contents of which are incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    (a) Field of the Invention 
         [0003]    The present invention relates to a heat exchanger tube, and more particularly to a heat exchanger tube which can maximize an effect on radiating heat as combustion is performed by a combustor such as a boiler or the like in an inner space of the heat exchanger tube and heat due to the internal combustion is transferred to the exterior of the heat exchanger tube. 
         [0004]    (b) Description of the Related Art 
         [0005]    A heat exchanger tube includes an inner insertion body and an outer accommodation body for accommodating the inner insertion body. As shown in  FIG. 1  and  FIG. 1A , an inner insertion body  2  of a conventional heat exchanger tube has a structure where two semicircular sectors each having a semicircular cross-section are coupled and then accommodated in the outer accommodation body  1 . 
         [0006]    However, the conventional heat exchanger tube with the foregoing structure has a problem of decreasing a heat exchanging efficiency, and accordingly there is a need of maximizing the surface area of the inner insertion body to thereby enlarge an area to be in contact with combustion gas of the combustor. 
       RELATED REFERENCE 
       [0007]    Korean Patent Publication No. 10-2013-0098292 (Sep. 4, 2013) 
       SUMMARY OF THE INVENTION 
       [0008]    Accordingly, the present invention is conceived to solve the forgoing problems, and an aspect of the present invention is to provide a heat exchanger tube, in which a surface area of an inner insertion body is maximally enlarged to improve contact with combustion gas so as to have an improved effect on transferring heat due to combustion to the exterior of the heat exchanger tube when the combustion is performed by a combustor such as a boiler or the like in an inner space of the heat exchanger tube. 
         [0009]    In accordance with an aspect of the present invention, a heat exchanger tube for transferring heat due to combustion of a combustor toward an exterior comprises an insertion body which is configured by folding up three or more sectors made of aluminum through extrusion molding; and an accommodation body which is configured to accommodate the insertion body so that an inner circumferential surface can be in contact with an outer circumferential surface of the insertion body. 
         [0010]    The insertion body may comprise three sectors each having a central angle of 120°. 
         [0011]    The insertion body may comprise four sectors each having a central angle of 90°. 
         [0012]    The insertion body may comprises a middle sector positioned in a middle, and a left sector and a right sector respectively positioned at left and right sides with respect to the middle sector. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The above and/or other aspects of the present invention will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings, in which: 
           [0014]      FIG. 1  is a cross-section view of a conventional heat exchanger tube, 
           [0015]      FIG. 1A  shows the structure of the inner insertion body of the conventional exchanger tube, 
           [0016]      FIG. 2  is a cross-section view of a heat exchanger tube according to an embodiment of the present invention, 
           [0017]      FIG. 2A  shows the structure of the inner insertion body of  FIG. 2 , 
           [0018]      FIG. 3  is a view showing only a certain sector of the heat exchanger tube of  FIG. 2 , 
           [0019]      FIG. 4  is a cross-section view of a heat exchanger tube according to another embodiment of the present invention; and 
           [0020]      FIG. 4A  shows that the structure of the inner insertion body of  FIG. 4 , 
           [0021]      FIG. 5  is a cross-section view of a heat exchanger tube according to still another embodiment of the present invention. 
           [0022]      FIG. 5A  shows the structure of the inner insertion body of  FIG. 5 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0023]    Hereinafter, exemplary embodiments according to the present invention will be described with reference to accompanying drawings. Also, terms and words used in the following description and claims have to be interpreted by not the limited meaning of the typical or dictionary definition, but the meaning and concept corresponding to the technical idea of the present invention on the assumption that the inventor can properly define the concept of the terms in order to describe his/her own invention in the best way. 
         [0024]    Accordingly, the disclosure in the specification and the configurations shown in the drawings are just preferred embodiments of the present invention and do not cover all the technical idea of the present invention. Thus, it should be appreciated that such embodiments may be replaced by various equivalents and modifications at a point of time when the present application is filed. 
         [0025]      FIG. 2  is a cross-section view of a heat exchanger tube according to an embodiment of the present invention, 
         [0026]    Like a conventional heat exchanger, the heat exchanger tube according to this exemplary embodiment as shown in  FIG. 2  includes an inner insertion body  100 , and an outer accommodation body  200  for accommodating the inner insertion body  100 . 
         [0027]    In particular, the heat exchanger tube according to this exemplary embodiment is different from the conventional heat exchanger tube in that the insertion body  100  includes three sectors with a central angle of 120° as shown in  FIG. 2A  and  FIG. 3 , in which the sectors have the same structure. 
         [0028]    For reference,  FIG. 3  is a view showing only a certain sector of the heat exchanger tube according to an embodiment of the present invention, 
         [0029]    As described above, three sectors  110  each having the central angle of 120° are folded to form a cylindrical shape having a circular cross-section. 
         [0030]    The insertion body  100  folded to have such a cylindrical shape is inserted and accommodated in an accommodation body  200 , so that an outer circumferential surface of the insertion body  100  can be in contact with an inner circumferential surface of the accommodation body  200 . 
         [0031]    Meanwhile, the inner circumferential surface of each sector  110  is formed with a plurality of  111  so that heat due to combustion performed in an inner space S can be transferred as much as possible to the accommodation body  200  being in contact with the insertion body  100 . 
         [0032]    At this time, a plurality of projections  112  may be formed on an outer circumferential surface of the rib  111  of the insertion body so as to improve an efficiency of transferring heat from the insertion body  100  to the accommodation body  200 . 
         [0033]    The foregoing insertion body  100  and insertion bodies  100  to be described later are made of aluminum excellent in the heat transfer through extrusion molding. 
         [0034]    In particular, as shown in  FIG. 1 , the semicircular sectors that constitute the conventional insertion body  2  are individually and separately manufactured through the extrusion molding. On the other hand, the sectors that constitute the insertion body according to an embodiment of the present invention are manufactured to form a single body through the extrusion molding as shown in  FIGS. 2 ,  4  and  5   
         [0035]    As described above, if the semicircular sectors that constitute the conventional insertion body  2  are individually and separately manufactured through the extrusion molding, the conventional semicircular sectors have to be inconveniently assembled in order to insert the insertion body  2  into the accommodation body  1 . On the contrary, the sectors that constitute the insertion body according to an embodiment of the present invention are manufactured to form a single body through the extrusion molding, and therefore the insertion body  100  can be easily inserted into the accommodation body  200  in such a way of folding the insertion body  100  including the plurality of sectors to be rolled up. 
         [0036]    According to another embodiment, the insertion body  100  to be inserted in the accommodation body  200  may include four sectors  110  each having a central angle of 90° as shown in  FIG. 4  and  FIG. 4A . Thus, four sectors 110° may be folded and then inserted in the accommodation body  200 . 
         [0037]    For reference,  FIG. 4  is a cross-section view of a heat exchanger tube according to another embodiment of the present invention. 
         [0038]    Likewise, the sector  110  is formed with a plurality of  111  so that heat can be more efficiently transferred from the insertion body  100  to the accommodation body  200 , and a plurality of projections  112  is formed on an outer circumferential surface of the rib  111 . 
         [0039]    According to still another embodiment, the insertion body  100  to be inserted in the accommodation body  200  may include three sectors  110 , i.e., include a middle sector  110   a  positioned in the middle, and a left sector  110   b  and a right sector  110   c  respectively positioned at left and right sides with respect to the middle sector  110   a.    
         [0040]    For reference,  FIG. 5  is a cross-section view of a heat exchanger tube according to still another embodiment of the present invention. 
         [0041]    Likewise, the middle sector  110   a,  the left sector  110   b  and the right sector  110   c  are formed with a plurality of  111  so that heat can be more efficiently transferred from the insertion body  100  to the accommodation body  200 , and a plurality of projections  112  is formed on an outer circumferential surface of the rib  111  (see  FIG. 5  and  FIG. 5A ). 
         [0042]    In this exemplary embodiment, the left sector  110   b  and the right sector  110   c  are folded toward the middle sector  110   a  and thus form a cylindrical shape so that the insertion body  100  having the cylindrical shape can be inserted and accommodated in the accommodation body  200 . 
         [0043]    According to an exemplary embodiment, the heat exchanger tube includes three or more sectors that constitute the inner insertion body to thereby maximize the surface area thereof and improve the efficiency of transferring heat due to combustion. 
         [0044]    Although a few exemplary embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.