KR0161440B1 - Heat exchanger - Google Patents

Abstract

According to the present invention, there is provided a pair of header pipes 30; A plurality of tubes (51) whose ends communicate with the header pipe (30); A heat exchanger having heat dissipation fins (13) disposed between the plurality of tubes (51), wherein the header pipe (30) includes: a flat bottom surface (38) on which a plurality of tube holes (36) are formed; A flat vertical portion 39 extending vertically from the flat bottom surface 38; A curved portion (34) formed convexly outwardly in the longitudinal direction of the header pipe; When the inclined surface 33 formed at the end is brazed, the cross section is provided with a circumferential surface 40 which forms a semicircular arc. The heat exchanger according to the present invention can be easily inserted into the tube, and by removing unnecessary space such as in a circular header pipe, the heat exchange medium can be smoothly flowed, and the size and weight can be reduced.

Description

heat transmitter

1 is a perspective view of a heat exchanger of the prior art.

2 (a) to 2 (g) are perspective state diagrams schematically showing the heat exchanger manufacturing process of FIG.

3 (a) to 3 (e) is a perspective state diagram schematically showing the manufacturing process of the heat exchanger according to the present invention.

4 is an isometric view showing an enlarged portion of the circle marked as A in FIG. 3 (d).

5 is a front view showing a state in which a tube is coupled to a header pipe.

* Explanation of symbols for main parts of the drawings

11,11 ': header pipe 12: tube

21: plate material 25: header pipe

26 tube 31 plate material

36: tube hole 37: guide groove

The present invention relates to a heat exchanger, and more particularly to a heat exchanger having a novel type of header pipe and a manufacturing method thereof.

In general, various heat exchangers have a fin tube type, a surpentine type, a drawn cup type, and a parallel flow type depending on the characteristics of the heat exchange medium, the working pressure, or the purpose of use. There are many kinds. In case of converting Freon gas, which is mainly used as a refrigerant, to another type of alternative refrigerant, the parallel flow type is expected to have excellent performance in the heat exchanger of the above type, which is particularly characterized by small size and light weight. In addition, the condenser maximizes the heat dissipation characteristics of the same area and the same area, and the ventilation resistance is low, which reduces the heat dissipation load of the radiator.

1 shows one embodiment of a parallel flow type heat exchanger. The heat exchanger 10 has a configuration in which a flat tube 12 is communicatively connected between a pair of header pipes 11 and 11 'spaced apart from each other at predetermined intervals. The heat exchange medium flows through the header pipes 11, 11 ′ and the plurality of tubes 12. A heat dissipation fin 13 is formed between the tubes 12 to expand the surface area of the heat dissipation, and the cap 14 seals the ends of the header pipes 11 and 11 '. The heat exchange medium is supplied through the supply pipe 11a connected to the header pipes 11 and 11 ', flows in the header pipes 11 and 11' and the tube 12, and is discharged through the discharge pipe 11a '. Baffles may be arranged in the header pipes 11 and 11 'to limit the flow of the heat exchange medium.

2 (a) to 2 (g) schematically show a process for manufacturing the header pipe shown in FIG. 1 according to the prior art. As a material for manufacturing the header pipe, an aluminum material in which a clad layer is formed on the surface is usually used.

The aluminum plate material 21 shown in FIG. 2 (a) has a length and width corresponding to the length and circumference of the header pipe. FIG. 2 (b) shows that the slits 22 capable of joining the baffles to the aluminum plate material 21 are formed. As described above, the baffle is installed in the header pipe to limit the flow path of the heat exchange medium, and forms a slit at a predetermined position in the header pipe and couples the baffle to the slit. At the same time as forming the slit 22, the end of the plate material is formed by pressing the inclined surface so that the plate material 21 can be rolled in a circle so that the inclined end can be brazed.

Next, as shown in FIG. 2 (c), the center portion of the plate material 21 is formed in a semicircular shape, and as shown in FIG. 2 (d), the holes 23 into which the tubes are coupled at predetermined intervals are arranged. ). In order to form the flat plate material 21 in a circular shape, rolling is performed by a cylinder. As shown in FIG. 2 (e), the flat plate material portion in which the slit 22 is formed is bent. The header pipe is completed in the shape shown in FIG. 2 (f), and in FIG. 2 (g), the tube 26 having the heat dissipation fin 27 is coupled through a hole formed in the header pipe 25. It is shown. The joining of the header pipe 25 and the tube 26 is made by brazing operation.

In the header pipe of the above configuration, there are some problems due to its shape. First, the end of the tube 26 coupled to the header pipe has a straight shape, whereas the hole portion 23 of the header pipe 25 is formed in a part of the circumferential surface, so that the tube 26 and the header pipe ( 25) To be joined without leakage of the heat exchange medium to each other, it must enter a predetermined depth until the cross-sectional area of the tube 26 coincides with the hole portion 23 formed in the header pipe 25. At this time, an unnecessary space is formed around the end of the tube 26 entering the header pipe 25, and the formation of such space adversely affects the flow of the heat exchange medium, and also hinders the miniaturization and weight reduction of the header pipe. Also in the manufacturing process, there is a disadvantage in that it is not easy to adjust the depth at which the tube enters the header pipe. Incidentally, there is a problem that the area in which the tube and the header pipe are brazed with each other is limited to the cross-sectional area of the hole portion 23 formed in the header pipe.

The present invention has been made to solve the above problems, an object of the present invention is to provide a heat exchanger having a novel shape of the header pipe.

Another object of the present invention is to provide a method of manufacturing a heat exchanger having a novel shaped header pipe.

In order to achieve the above object, according to the present invention, a pair of header pipe spaced at a predetermined interval; A plurality of tubes stacked between the header pipes and whose ends communicate with the header pipes; A heat exchanger having heat dissipation fins disposed between the plurality of tubes, the header pipe comprising: a flat bottom surface on which a plurality of tube holes into which the plurality of tubes are inserted are formed; A flat vertical portion extending vertically from the flat bottom surface; A bent portion formed to block outward in the longitudinal direction of the header pipe; When the inclined surface formed at the end is brazed, the heat exchanger is characterized in that the cross section has a circumferential surface that forms a semicircular arc.

According to another feature of the invention, the guide groove extending vertically from the formation position of the tube hole in the flat vertical portion of the header pipe so as to guide the entry of the tube when the tube is inserted through the tube hole It is provided.

According to another feature of the invention, the header pipe is provided with one or more slits so that a baffle that restricts the flow of the heat exchange medium can be combined.

In addition, according to the present invention, a pair of header pipe spaced at a predetermined interval; A plurality of tubes stacked between the header pipes and whose ends communicate with the header pipes; A method of manufacturing a heat exchanger having heat dissipation fins disposed between the plurality of tubes, the method comprising: a flat bottom surface provided in the header pipe, a flat vertical portion extending vertically from the flat bottom surface, a curved portion, and a circumferential surface A bend forming step of dividing a forming portion on an aluminum flat plate material having a predetermined size and forming the bent portion; a bending step of bending the aluminum flat material vertically from a forming portion of the flat bottom surface to form the flat vertical portion; A tube hole forming step of forming a plurality of tube holes into which a plurality of tubes can be inserted, the flat plate material being perpendicularly formed from a position where the tube holes are formed so as to form a guide groove through which the tube enters the flat vertical portion; Guide groove forming step of pressing, can form the circumferential surface The method of manufacturing a heat exchanger comprising a brazing step of brazing by inserting the plurality of tubes are provided in a state in which a bent contact end portions of the flat plate material into a semi-circular.

According to another feature of the present invention, in the forming of the bent portion, at least one slit is formed at a predetermined position in the forming portion of the circumferential surface, and both ends of the flat plate material are pressed to form an inclined surface.

Hereinafter, the present invention will be described in more detail with reference to an embodiment shown in the accompanying drawings.

3 (a) to 3 (e) schematically show the manufacturing process of the header pipe according to the present invention. Figure 3 (a) shows an aluminum plate material 31 to be processed into a header pipe, the width of the plate material being the length of the outer circumferential surface of the header pipe which will be described later, and the length of the plate material being the length of the header pipe. Will correspond to It is preferable that a clad layer is formed on the surface of the plate material 31 so that subsequent brazing bonding can be made.

3 (b) shows a slit formed in the plate material 31. As described above, a baffle that is installed to restrict the flow of the heat exchange medium is fixed to the slit 32, and one or more slits may be formed at a predetermined position according to a design purpose. In Figure b), only one slit is formed for convenience of illustration.)

FIG. 3 (c) shows that the bent portion 34 and the inclined surface 33 are formed in the plate material 31 on which the slits 32 are formed. The dashed line indicated by the numeral 35 indicates the line where the plate material is subjected to bending. The central portion surrounded by the bend line 35 is a flat bottom portion 38 in which a hole in the finished header pipe to be joined is to be formed. The bend part 34 is formed by bending the flat plate material 31 in two places along the longitudinal direction on both sides of the flat bottom portion 38 surrounded by the bend line 35. The bending line 35 is formed convexly toward the outer direction of the header pipe. Between the central portion 38 and the bend 34 corresponds to the flat vertical portion 39, which is then flattened with the flat bottom portion 38 when bending is performed along the bending line 35. It is vertical. At the left and right ends of the bend 34, a circumferential surface portion 40 is formed in the completed header pipe, the cross section of which will form a semi-circular cylinder. In addition, the end of the circumferential surface portion 40 is rolled to the inclined surface 33 so that the contact can be easily made when the plate material 31 is rolled and the end is brazed.

FIG. 3 (d) shows that the flat plate material 31 is bent along the bending line 35 shown in FIG. 3 (c). The plate material is bent at an angle of 90 degrees along the bend line 35, and in FIG. 3 (d), the flat bottom portion 38 is formed with a number of holes 36 into which the tube can be inserted. A guide groove 37 is formed in the flat vertical portion 39 from the bottom portion where the tube hole 36 is formed to the portion where the bend portion 34 is formed along the width of the flat plate material. When inserting the tube into the header pipe, the end of the tube enters along the guide groove 37. FIG. 3 (e) shows the bending process with the completed inclined surface 33 in contact.

FIG. 4 is an enlarged view of a portion indicated by circle A in FIG. 3 (d). The guide groove 37 is formed by pressing a predetermined portion of the plate material, and extends from the tube hole 36 to the lower portion where the bent portion 34 is formed as shown in FIG.

5 is a front view showing a state in which the tube 51 is inserted into the header pipe 30. The tube 51 is inserted into the header pipe 30 through the bottom of the flat plate of the header pipe in which the hole 36 is formed, and runs along the guide groove 37. Guide groove 37 is formed only from the bottom of the flat plate to the lower portion of the bend 34, the width of the tube 51 coincides with the length between the guide groove 37, so the tube enters past the lower portion of the bend 34 can do. Since the guide groove is not formed after the upper portion of the bend 34, the tube 51 is stopped at the portion indicated by 52. Brazing between the tube 51 and the header pipe 30 can be made between the cross-sectional area of the hole 36 and the tube, and between the guide groove 37 and the tube, thus making the brazing area wider than before.

The heat exchanger according to the present invention comprises a straight hole in the header pipe to which the tube is coupled, and the shape of the header pipe in a square corresponding to the outer circumferential surface of the tube to facilitate insertion of the tube, as in a circular header pipe. By eliminating the unnecessary space, the flow of the heat exchange medium is not only made smooth, but also has the advantage that it can be reduced in size and weight. In addition, since the brazing between the header pipe and the tube is made between the tube hole cross-sectional area of the header pipe and the guide groove, a more firm coupling can be achieved.

Claims (5)

A pair of header pipes 30 spaced at predetermined intervals; A plurality of tubes (51) stacked between the header pipes (30) and whose ends communicate with the header pipes (30); In the heat exchanger provided with heat dissipation fins 13 disposed between the plurality of tubes 51, the header pipe 30 includes a plurality of tube holes 36 into which the plurality of tubes 51 are inserted. A flat bottom surface 38 formed; A flat vertical portion 39 extending vertically from the flat bottom surface 38; A bent portion (34) formed to block outward in the longitudinal direction of the header pipe; And a circumferential surface (40) whose cross section forms a semicircular arc when the inclined surface (33) formed at the end is brazed. The tube of claim 1, wherein the tube is inserted into a flat vertical portion 39 of the header pipe 30 so as to guide the entry of the tube 51 when the tube 51 is inserted through the tube hole 36. And a guide groove (37) extending vertically from the formation position of the hole (36). The heat exchanger as claimed in claim 1, wherein at least one slit (32) is provided in the header pipe (30) to allow a baffle to restrict the flow of the heat exchange medium. A pair of header pipes 30 spaced at predetermined intervals; A plurality of tubes (51) stacked between the header pipes (30) and whose ends communicate with the header pipes (30); In the manufacturing method of the heat exchanger provided with the heat dissipation fin 13 arrange | positioned between the said some tube 51, it extends perpendicularly from the flat bottom face 38 and the flat bottom face 38 with which the header pipe is equipped. Forming a bent portion 34 by dividing the formed flat vertical portion 39, the bent portion 34, and the formed portion of the circumferential surface 40 on an aluminum flat plate material 31 having a predetermined size, and Bending the aluminum plate material 31 vertically from the forming portion of the flat bottom face 39 to form a flat vertical part 39, wherein the plurality of tubes 51 are inserted into the flat bottom face 38. A tube hole forming step of forming a plurality of tube holes 36, the guide grooves 37 through which the tube 51 enters into the flat vertical part 39 of the tube holes 36. The flat plate material 31 perpendicularly from the forming position A step of forming a guide groove to be leased, and a brazing step of inserting and brazing the plurality of tubes 51 in a state in which both ends of the flat plate material 31 are bent in a semicircular shape so as to form the circumferential surface 40. Method for producing a heat exchanger comprising. The inclined surface (33) according to claim 4, wherein at least one slit (32) is formed at a predetermined position in the formation portion of the circumferential surface (40) in the step of forming the bent portion, and both ends of the flat plate (31) are pressed. Method for producing a heat exchanger, characterized in that forming a.