JP6071711B2 - Cylindrical fin unit manufacturing method for heat exchanger and heat exchanger using the manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a cylindrical fin unit of a heat exchanger and a heat exchanger using the manufacturing method.

  Generally, a radiator as a heat exchanger mounted on a vehicle includes a plurality of flat tubes 1 that are stacked at a predetermined interval and in which a coolant (cooled fluid) flows, as shown in FIG. A corrugated fin 3 disposed between the flat tubes 1 and in contact with the flat surfaces 2 of the flat tubes 1 on both sides, and a coolant which has become a high temperature by cooling an engine (not shown) Is introduced into the flat tube 1, and wind (cooling fluid) generated by running of the vehicle or generated by a cooling fan (not shown) is circulated into the space in which the corrugated fins 3 are disposed, and the corrugated A high-temperature coolant is cooled via the fins 3 and the flat tubes 1.

  By the way, in recent years, the load on the engine tends to increase due to stricter exhaust gas regulations of vehicles, and it is strongly demanded to improve the cooling performance by increasing the heat transfer efficiency of the radiator.

  For this reason, conventionally, in a radiator as a heat exchanger using the corrugated fins 3, a louver is provided on the corrugated fins 3, thereby increasing the heat radiation area and improving the heat transfer efficiency. there were.

  However, if the louver is provided in the corrugated fins 3 to improve the heat transfer efficiency, the pressure loss of the wind flowing through the space in which the corrugated fins 3 are disposed is increased to sufficiently improve the heat transfer efficiency. There was a problem that I could not.

  In order to solve these problems, the present applicant has already applied for a heat exchanger disclosed in Patent Document 1. As shown in FIG. 7, this heat exchanger is recessed from the outer peripheral surface 5 between a plurality of flat tubes 1 that are stacked at a predetermined interval and in which a coolant (cooled fluid) flows. A plurality of cylindrical fins 4 formed with spiral beads 7 protruding on the peripheral surface 6 are arranged, and the wind (cooling fluid) is circulated in the axial direction of the cylindrical fins 4 between the plurality of flat tubes 1. Heat exchange with the coolant in the flat tube 1 is performed.

  And in the heat exchanger currently disclosed by patent document 1, the wind which distribute | circulates to the axial direction of the cylindrical fin 4 between the said some flat tubes 1 is made into a swirl flow by the helical bead 7 of this cylindrical fin 4. Therefore, the distance through which the wind flows and the residence time are extended, and the heat transfer efficiency can be improved as compared with the laminar cooling by the corrugated fins 3. In addition, the pressure loss can be greatly reduced and the heat transfer efficiency can be improved as compared with the corrugated fin with a louver.

JP 2009-127895 A

  However, the cylindrical fin 4 of the heat exchanger disclosed in Patent Document 1 needs to braze a large number of pipes between the flat tubes 1 and attaches the brazing powder to the numerous pipes. In the state, it has been very difficult to insert the pipe between the flat tubes 1 while preventing the powder from falling off, and the production is not practical.

  The present invention has been made in view of the above-mentioned conventional problems, and it is possible to improve the production efficiency while reducing the pressure loss of the cooling fluid flowing through the space in which the cylindrical fins are disposed and improving the heat transfer efficiency. An object of the present invention is to provide a method of manufacturing a cylindrical fin unit of a heat exchanger that can be converted into a heat exchanger and a heat exchanger using the manufacturing method.

The present invention includes a plurality of flat tubes that are stacked at a predetermined interval and in which a fluid to be cooled flows, and a plurality of flat tubes that are disposed between the plurality of flat tubes and in which a spiral bead is formed on a peripheral surface. And a cylindrical fin unit manufacturing method for a heat exchanger in which a cooling fluid flows between the plurality of flat tubes in the axial direction of the cylindrical fins to exchange heat with the fluid to be cooled in the flat tubes. And
An inclined bead portion extending obliquely in the vertical side direction is formed on a rectangular metal thin plate in which the axial direction of the cylindrical fin is set as a rectangular vertical side and the direction perpendicular to the axial line of the cylindrical fin is set as a horizontal side of the rectangle. In addition, an inclined bead portion forming step of forming a plurality with a predetermined interval in the vertical side direction and forming a plurality with a predetermined interval in the horizontal side direction;
By bending the thin metal plate having the inclined bead portion formed in the inclined bead portion forming step, the end points and the start points of the plurality of inclined bead portions formed at predetermined intervals in the longitudinal direction are connected to each other, and the spiral A cylindrical fin panel processing step for forming a cylindrical fin panel in which a cylindrical portion formed on the peripheral surface as a bead and a flat plate portion extending in a tangential direction of the cylindrical portion are alternately connected in the lateral direction;
By inserting the cylindrical portion of one cylindrical fin panel formed in the cylindrical fin panel processing step in the axial direction between the cylindrical portions of another cylindrical fin panel, the flat plate of the single cylindrical fin panel And a cylindrical fin unit assembling step for forming a cylindrical fin unit in which the cylindrical portion is disposed between the flat plate portion of the other cylindrical fin panel and the cylindrical fin unit. This relates to the unit manufacturing method.

  The method for manufacturing a cylindrical fin unit of the heat exchanger preferably includes a stacking step of stacking a plurality of the cylindrical fin units formed in the cylindrical fin unit assembly step so that the flat plate portions overlap each other.

  On the other hand, this invention concerns on the heat exchanger using the cylindrical fin unit manufacturing method of the said heat exchanger.

  According to the method for manufacturing the cylindrical fin unit of the heat exchanger and the heat exchanger using the manufacturing method of the present invention, the pressure loss of the cooling fluid flowing through the space in which the cylindrical fin is disposed is reduced, and the heat transfer efficiency is improved. While improving, the production efficiency can be increased and the practical application can be achieved.

The top view which shows the metal thin plate in which the inclination bead part was formed in the inclination bead part formation process in the Example of the cylindrical fin unit manufacturing method of the heat exchanger of this invention, and the cylindrical fin panel formed at the subsequent cylindrical fin panel processing process FIG. It is the II section enlarged view of FIG. It is the top view which shows the cylindrical fin panel mutually inserted in the cylindrical fin unit assembly | attachment process in the Example of the cylindrical fin unit manufacturing method of the heat exchanger of this invention, and the front view which shows the assembled cylindrical fin unit. It is a perspective view which shows an example of the heat exchanger manufactured with the cylindrical fin unit manufacturing method of the heat exchanger of this invention. It is a front view which shows the other example of the heat exchanger manufactured by adding a lamination process further in the cylindrical fin unit manufacturing method of the heat exchanger of this invention. It is a perspective view which shows an example of the radiator as a conventional heat exchanger. It is a perspective view which shows the heat exchanger currently described in patent document 1. FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 4 show an embodiment of a method of manufacturing a cylindrical fin unit of a heat exchanger according to the present invention and a heat exchanger using the manufacturing method. In the figure, the same reference numerals as those in FIG. Although the basic structure is the same as that of the conventional one shown in FIG. 7, the feature of this embodiment is that, as shown in FIGS. The cylindrical fin unit 4U is manufactured through the fin panel processing step and the cylindrical fin unit assembly step.

  In the inclined bead portion forming step, as shown in FIG. 1, a rectangular shape in which the axial direction of the cylindrical fin 4 is set as a rectangular vertical side V and a direction perpendicular to the axial line of the cylindrical fin 4 is set as a rectangular horizontal side H. A plurality of inclined bead portions 9 extending obliquely in the vertical side V direction are formed on the thin metal plate 8 such as aluminum with a required interval in the vertical side V direction. A plurality (four sets in the example of FIG. 1) are formed at a necessary interval in the direction of the side H.

  In the cylindrical fin panel processing step, as shown in FIG. 1, the metal thin plate 8 on which the inclined bead portion 9 is formed in the inclined bead portion forming step is bent to leave a required interval in the vertical side V direction. The end points 9e and the start points 9s of a plurality (two in the example of FIG. 1) of the inclined bead portions 9 are connected to each other to form an outer diameter φd formed on the peripheral surface as a spiral bead 7 (see FIGS. 3 and 7). The cylindrical portion 4a and the flat plate portion 4b extending in the tangential direction of the cylindrical portion 4a form a cylindrical fin panel 4A that is alternately connected in the horizontal side H direction. As shown in FIG. 2, a narrowed portion 4c formed when the metal thin plate 8 is bent is formed between the cylindrical portion 4a and the flat plate portion 4b. The distance h between the cylindrical portion 4a side surface and the center of the cylindrical portion 4a is set so that h> d / 2.

Here, the center-to-center distance P of the cylindrical portion 4a is
P = 2d-α
Α is a minute value set in accordance with the outer diameter φd of the cylindrical portion 4a.

  The spiral bead 7 is formed so as to be recessed from the outer peripheral surface side of the cylindrical portion 4a and protrude toward the inner peripheral surface side.

  In the cylindrical fin unit assembling step, as shown in FIG. 3, the cylindrical portion 4a of one cylindrical fin panel 4A formed in the cylindrical fin panel processing step is replaced with the cylindrical portion 4a of another cylindrical fin panel 4A. A cylinder in which the cylindrical portion 4a is disposed between the flat plate portion 4b of the one cylindrical fin panel 4A and the flat plate portion 4b of the other cylindrical fin panel 4A by being inserted in the axial direction therebetween. The fin unit 4U is formed.

Here, as shown in FIG. 1 and FIG. 2, the distance h between the cylindrical portion 4a side surface of the flat plate portion 4b and the center of the cylindrical portion 4a by the throttle portion 4c is h> d / 2, The center distance P of the cylindrical portion 4a is
P = 2d-α
Therefore, the cylindrical portion 4a of one cylindrical fin panel 4A formed in the cylindrical fin panel processing step may be inserted and assembled in the axial direction between the cylindrical portions 4a of the other cylindrical fin panel 4A. In addition, the two cylindrical fin panels 4A assembled to each other do not separate in a direction perpendicular to the axial direction of the cylindrical portion 4a and perpendicular to the flat plate portion 4b.

  Then, the cylindrical fin unit 4U formed in the cylindrical fin unit assembling step is integrated, and the heat exchanger can be manufactured simply by inserting it between the flat tubes 1 as shown in FIG. .

  As a result, when a heat exchanger is manufactured using the method in the present embodiment, a large number of pipes are brazed between the flat tubes 1 like the cylindrical fins 4 of the heat exchanger disclosed in Patent Document 1. This eliminates the need to insert the pipe between the flat tubes 1 while preventing the powder from falling off while the powder for brazing is attached to a large number of pipes. It becomes very good and can be put into practical use in terms of manufacturing.

  Thus, the pressure loss of the cooling fluid flowing through the space in which the cylindrical fins 4 are disposed can be reduced to improve the heat transfer efficiency, and the production efficiency can be increased and put into practical use.

  Incidentally, in the method of the present embodiment, as shown in FIG. 5, a plurality (two in the example of FIG. 5) of the cylindrical fin units 4U formed in the cylindrical fin unit assembling step are stacked so that the flat plate portions 4b overlap. It is also possible to add a stacking process, which is effective in selecting the number of stacks of the cylindrical fin units 4U as necessary and adjusting the heat radiation area to further improve the heat transfer efficiency. .

  In addition, the cylindrical fin unit manufacturing method of the heat exchanger of the present invention and the heat exchanger using the manufacturing method are not limited to the above-described embodiments, and the heat exchanger is not limited to the radiator of the vehicle. Needless to say, various modifications can be made without departing from the scope of the present invention, such as being applicable to other devices.

DESCRIPTION OF SYMBOLS 1 Flat tube 4 Cylindrical fin 4A Cylindrical fin panel 4U Cylindrical fin unit 4a Cylindrical part 4b Flat plate part 4c Restriction part 7 Spiral bead 8 Metal thin plate 9 Inclined bead part 9e End point 9s Starting point V Vertical side H Horizontal side

Claims (3)

A plurality of flat tubes that are stacked at a predetermined interval and in which a fluid to be cooled flows, and a plurality of cylindrical fins that are disposed between the plurality of flat tubes and in which a spiral bead is formed on the peripheral surface; A cylindrical fin unit manufacturing method for a heat exchanger that allows a cooling fluid to flow between the plurality of flat tubes in the axial direction of the cylindrical fins to exchange heat with the fluid to be cooled in the flat tubes,
An inclined bead portion extending obliquely in the vertical side direction is formed on a rectangular metal thin plate in which the axial direction of the cylindrical fin is set as a rectangular vertical side and the direction perpendicular to the axial line of the cylindrical fin is set as a horizontal side of the rectangle. In addition, an inclined bead portion forming step of forming a plurality with a predetermined interval in the vertical side direction and forming a plurality with a predetermined interval in the horizontal side direction;
By bending the thin metal plate having the inclined bead portion formed in the inclined bead portion forming step, the end points and the start points of the plurality of inclined bead portions formed at predetermined intervals in the longitudinal direction are connected to each other, and the spiral A cylindrical fin panel processing step for forming a cylindrical fin panel in which a cylindrical portion formed on the peripheral surface as a bead and a flat plate portion extending in a tangential direction of the cylindrical portion are alternately connected in the lateral direction;
By inserting the cylindrical portion of one cylindrical fin panel formed in the cylindrical fin panel processing step in the axial direction between the cylindrical portions of another cylindrical fin panel, the flat plate of the single cylindrical fin panel And a cylindrical fin unit assembling step for forming a cylindrical fin unit in which the cylindrical portion is disposed between the flat plate portion of the other cylindrical fin panel and the cylindrical fin unit. Unit manufacturing method.   The method for manufacturing a cylindrical fin unit of a heat exchanger according to claim 1, further comprising a stacking step of stacking a plurality of cylindrical fin units formed in the cylindrical fin unit assembly step so that the flat plate portions overlap each other.   The heat exchanger using the cylindrical fin unit manufacturing method of the heat exchanger of Claim 1 or 2.

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