JP3199776U - Heat exchanger - Google Patents

Abstract

A fin tube type heat exchanger with improved heat exchange efficiency is provided. A plurality of thin plate-like fin members 30 having a plurality of through holes 32 arranged in an aligned manner are stacked so that the through holes are aligned with a predetermined interval, and a tube is press-fitted into the through holes so that heat can be transferred to the tubes. A fin tube type heat exchanger in which a first heat exchange medium that flows and a second heat exchange medium that flows between fin members exchange heat, and the fin member includes a second heat between the plurality of through holes. A plurality of V-shaped wavy convex portions 36 and concave portions 38 are formed in a line and at equal intervals from the inflow side E to the outflow side F so that the exchange medium flows from the top side of the V shape. In addition to the main flow in the second heat exchange medium, a secondary flow consisting of a flow toward the center of the V shape near the surface of the fin member and a flow toward the both sides of the V shape at the intermediate portion of the adjacent fin member. A flow is generated and heat exchange efficiency is improved. [Selection] Figure 2

Description

  The present invention relates to a heat exchanger, and more particularly, to a fin tube type heat exchanger.

  Conventionally, as this type of heat exchanger, a plurality of fins having a plurality of through-holes arranged in a grid pattern are stacked at a predetermined interval, a plurality of tubes are press-fitted into the plurality of through-holes, and the air flowing between the fins And a heat exchange medium that flows in a plurality of tubes have been proposed (see, for example, Patent Document 1). In this heat exchanger, the ends of the tubes are connected so that the heat exchange medium flowing in from the row of tubes arranged on the air outflow side meanders and flows out of the row of tubes arranged on the air inflow side. The air and the heat exchange medium flow so as to face each other as a whole.

JP 2010-281553 A

  However, in the above-described heat exchanger, the air flow between the fins is monotonous and the heat exchange efficiency is lowered. Although it is conceivable to arrange the tubes in a staggered manner with respect to the air flow, the air flow resistance becomes large. Moreover, in any arrangement, the back side of the tube becomes a dead water area with respect to the air flow, and the heat exchange efficiency is lowered.

  The main purpose of the heat exchanger of the present invention is to improve heat exchange efficiency in a fin-tube heat exchanger.

  The heat exchanger of the present invention employs the following means in order to achieve the main object described above.

The heat exchanger of the present invention is
A plurality of thin fin-shaped fin members having a plurality of through holes arranged in alignment are stacked with a predetermined interval so that the plurality of through holes are aligned, and a plurality of tubes are press-fitted into the plurality of through holes so that heat can be transferred, A heat exchanger of a fin tube type in which a first heat exchange medium flowing through the plurality of tubes and a second heat exchange medium flowing between the fin members exchange heat;
The fin member is arranged so that the second heat exchange medium flows from the top side of the V-shape between the plurality of through holes that can be seen from the inflow side to the outflow side of the second heat exchange medium. 2 A plurality of V-shaped wavy irregularities are formed so as to be arranged in a line and at equal intervals from the inflow side to the outflow side of the heat exchange medium,
It is characterized by that.

  In the heat exchanger of the present invention, a plurality of thin fin members having a plurality of through-holes arranged in an aligned manner are stacked so that the plurality of through-holes are aligned with a predetermined interval, and a plurality of tubes are placed in the plurality of through-holes. It is configured as a fin tube type heat exchanger by press-fitting so that heat can be transferred, and the first heat exchange medium flowing through the plurality of tubes and the second heat exchange medium flowing between the fin members exchange heat. The fin member has a second heat exchange medium such that the second heat exchange medium flows from the top side of the V-shape between the plurality of through holes that can be seen from the inflow side to the outflow side of the second heat exchange medium. A plurality of V-shaped wavy irregularities are formed so as to be arranged in a line and at equal intervals from the inflow side to the outflow side. The plurality of V-shaped wavy irregularities form a secondary flow toward the V-shaped bent portion (center) with respect to the main flow of the second heat exchange medium on the surface of the fin member. In the central part (between) of the fin members, a secondary flow toward both sides of the V shape is formed with respect to the main flow of the second heat exchange medium. That is, due to the plurality of V-shaped wavy irregularities, the flow of the second heat exchange medium causes a secondary flow from the tubes on both sides toward the center on the surface of the fin member, and adjacent to the main flow. A secondary flow toward the tubes on both sides occurs in the center between the fin members. Since such a secondary flow contributes to heat exchange, heat exchange efficiency can be improved. Moreover, since such a secondary flow also causes a flow in the dead water area on the back side of the tube with respect to the main flow of air, the heat exchange efficiency can be further improved. Further, since the secondary flow toward the center generated on the surface of the fin member moves a small amount of foreign matter mixed in the second heat exchange medium to the center on the surface of the fin member, the foreign matter is present at the junction between the tube and the fin member. Can be prevented from being deposited. In addition, it is preferable that the plurality of through holes are arranged in a grid pattern.

  In such a heat exchanger of the present invention, the V-shaped wavy unevenness may be formed such that the amplitude of the V-shaped bent portion is larger than the amplitude of the other portion. By increasing the amplitude of the V-shaped bent portion (V-shaped bottom portion), the secondary flow from the tubes on both sides of the fin member surface toward the center and the two sides of the fin between the adjacent fin members The secondary flow toward the tube can be strengthened, which can further improve the heat exchange efficiency.

  Further, in the heat exchanger according to the present invention, the wavy unevenness in the portion where the through holes are not formed on both sides of the plurality of wavy unevenness is larger than the wavy unevenness in the portion where the through holes are formed on both sides. It can also be formed to be V-shaped. In this way, a stronger secondary flow can be generated between the tubes aligned along the main flow of the second heat exchange medium, and the heat exchange efficiency can be further improved.

  Further, in the heat exchanger according to the present invention, the fin member is formed with a step portion around the plurality of through holes where the fin member has the predetermined interval when the fin members are stacked. You can also. If it carries out like this, while being able to make the space | interval of a fin member into a predetermined space accurately, the assembly | attachment property of the tube for heat exchange can be made favorable.

It is the side view which looked at the fin tube type heat exchanger 20 as one Example of this invention from the side. It is the top view which looked at the fin tube type heat exchanger 20 of FIG. 1 from upper direction. It is a fragmentary sectional view which shows a part by the side of A1 of A1-A2 cross section of FIG. It is a fragmentary sectional view which shows a part by the side of B1 of the B1-B2 cross section of FIG. It is a fragmentary sectional view which shows a part by the side of C1 of the C1-C2 cross section of FIG. It is a fragmentary sectional view which shows a part by the side of D1 of D1-D2 cross section of FIG. It is explanatory drawing which shows typically the secondary flow of the 2nd heat exchange fluid between the fin members 30 by the V-shaped wavy convex part 36 and the recessed part 38, and between the tubes 22. FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a side view of a finned tube heat exchanger 20 as an embodiment of the present invention viewed from the side, and FIG. 2 is a plan view of the finned tube heat exchanger 20 of FIG. is there. 3 is a partial cross-sectional view showing a part on the A1 side of the A1-A2 cross section of FIG. 2, and FIG. 4 is a partial cross-sectional view showing a part on the B1 side of the B1-B2 cross section of FIG. 5 is a partial cross-sectional view showing a part on the C1 side of the C1-C2 cross section of FIG. 2, and FIG. 6 is a partial cross-sectional view showing a part on the D1 side of the D1-D2 cross section of FIG. As shown in FIGS. 1 and 2, the heat exchanger 20 of the embodiment includes a plurality of fin members 30 and a plurality of tubes 22 that are arranged in a lattice pattern and penetrate the plurality of fin members 30. The heat exchanger 20 according to the embodiment includes a first heat exchange medium (for example, a heat medium or a refrigerant) that flows through the plurality of tubes 22 and a second heat exchange medium (for example, air) that flows between the plurality of fin members 30. Heat exchange takes place between them. In FIG. 2, the white arrow E indicates the inflow of the second heat exchange medium, and the white arrow F indicates the outflow of the second heat exchange medium.

  The tube 22 is formed of a metal pipe having a high thermal conductivity (for example, a pipe having a diameter of about 10 mm to 20 mm made of metal such as aluminum or stainless steel).

  The fin member 30 is configured by performing a burring process, a pressing process, or the like on a thin metal plate having a high thermal conductivity (for example, a 0.3 mm or 0.2 mm thin plate made of a metal such as aluminum or stainless steel). For example, a plurality of layers are stacked with an interval of about 2 mm to 5 mm. As shown in FIG. 2, a plurality of burring holes 32 arranged in a lattice pattern are formed in the fin member 30 by burring. After the plurality of fin members 30 are stacked, each tube 22 is placed in each burring hole 32. It is press-fitted. As shown in FIG. 6, a burring pedestal portion 34 and a stepped portion 33 are formed around each burring hole 32 of the fin member 30 by performing burring processing in two stages. In the embodiment, the burring hole 32 and the burring pedestal portion 34 are formed so as to have the same height, and the stepped portion 33 is formed so that the width thereof becomes the thickness of the thin plate. In the fin member 30 of the embodiment, as shown in FIG. 6, when a plurality of layers are stacked, the burring holes 32 are fitted and inserted into the burring pedestals 34 of the adjacent fin members 30 (upper fin members 30 in FIG. 6). The end portion (top portion) 32 abuts on the inside of the step portion 33 of the adjacent fin member 30, and the step portion 33 contacts the lower end (bottom portion) of the burring pedestal portion 34 of the adjacent fin member 30. For this reason, the fin member 30 does not generate a gap between each burring hole 32 portion and the burring hole 32 portion of the adjacent fin member 30 and also between the adjacent fin members 30. Alternatively, the burring pedestals 34 can be stacked at a height interval. Thus, since there is no gap in the portion of the burring hole 32 of the adjacent fin member 30, heat transfer from the press-fitted tube 22 can be performed satisfactorily.

  The fin member 30 has a plurality of V-shaped convex protrusions between the burring holes 32 that can be seen in the outflow direction as viewed from the inflow direction of the second heat exchange medium (the direction of the white arrow E in FIG. 2). The portions 36 and the recesses 38 are arranged in a line and at equal intervals from the inflow side to the outflow side of the second heat exchange medium so that the second heat exchange medium flows from the V-shaped top side (upper side). Further, it is formed by a smooth curved surface. The V-shaped corrugated convex portion 36 and the concave portion 38 have a small V shape in the portion where the burring hole 32 is formed on both sides, and the portion where the burring hole 32 is not formed on both sides (the flow of the second heat exchange medium). The portion between the burring holes 32 along the direction) is formed so as to have a large V-shape. Further, as shown in FIGS. 3 to 6, the V-shaped wavy convex portion 36 and the concave portion 38 have an amplitude L1 at the center of the V-shape (center between the burring holes 32). It is formed to be larger than the amplitude L2 in the vicinity of the hole 32). The fin member 30 is formed with a plurality of cutouts 31 at the end of the burring holes 32 on the outflow side so that the inflow side and the outflow side of the second heat exchange medium can be easily determined.

  FIG. 7 is an explanatory diagram schematically showing a secondary flow of the second heat exchange fluid between the fin members 30 and between the tubes 22 by the V-shaped wavy convex portions 36 and the concave portions 38. For ease of explanation, the fin member 30 does not show the V-shaped wavy convex portions 36 and the concave portions 38. When the second heat exchange medium flows as indicated by the white arrows E and F in FIG. 2, the main flow of the second heat exchange medium is in the directions indicated by the white arrows E and F, but in the vicinity of the surface of the fin member 30. Since the second heat exchange medium flows along the V-shaped wavy convex portion 36 and the concave portion 38, a flow component (flow component moving away from the tube 22) toward the center of the V-shape is generated. On the other hand, in the intermediate part between two adjacent fin members 30, the flow components (2) flowing toward both sides of the V-shape of the second heat exchange medium pushed out by the flow components toward the center of the V-shape near the surface of the fin member 30 ( A flow component approaching the tube 22 occurs. Therefore, as shown in FIG. 7, in addition to the main flow in the second heat exchange medium, V flows at the intermediate portion between the two fin members 30 adjacent to the flow toward the center of the V shape near the surface of the fin member 30. The flow toward both sides of the character occurs as a secondary flow. Since this secondary flow promotes heat transfer of the fin member 30 and promotes uniformity of the temperature of the second heat exchange medium, the heat exchange efficiency can be improved. In particular, by forming the V-shaped wavy convex portions 36 and the concave portions 38 formed at portions between the burring holes 32 along the flow direction of the second heat exchange medium so as to increase the V-shape, The range in which the secondary flow is generated can be widened, and foreign matter can be prevented from staying in the tube 22 inserted into the burring hole 32. Further, the second heat exchange medium in the V-shaped central portion (bending portion) is formed by forming the V-shaped wavy convex portion 36 and the concave portion 38 so that the amplitude of the V-shaped center (bending portion) is increased. The flow toward the intermediate portion of the two adjacent fin members 30 can be strengthened, and a stronger secondary flow can be generated. As a result, the heat exchange efficiency can be improved. In the fin member 30 of the embodiment, not only the heat exchange efficiency is improved by increasing the contact area with the second heat exchange member by forming the V-shaped wavy convex portion 36 and the concave portion 38. In addition to the main flow in the second heat exchange medium, the above-described secondary flow is generated to improve the heat exchange efficiency.

  In the heat exchanger 20 of the embodiment described above, the second heat exchange medium is seen from the top side of the V shape between the burring holes 32 that can be seen in the outflow direction as seen from the inflow direction of the second heat exchange medium of the fin member 32. By forming a plurality of V-shaped convex portions 36 and concave portions 38 so as to be arranged in a row and at equal intervals from the inflow side to the outflow side of the second heat exchange medium, In addition to the mainstream flow in the second heat exchange medium, it consists of a flow toward the center of the V shape in the vicinity of the surface of the fin member 30 and a flow toward both sides of the V shape in the middle portion between the two adjacent fin members 30. A secondary flow can be generated and heat exchange efficiency can be improved. In addition, by forming the V-shaped wavy convex portion 36 and the concave portion 38 formed in the portion between the burring holes 32 along the flow direction of the second heat exchange medium so that the V-shape is increased, the above-described configuration is achieved. The range in which the secondary flow is generated can be widened, and foreign matter can be prevented from staying in the tube 22 inserted into the burring hole 32. Further, the second heat exchange medium in the V-shaped central portion (bending portion) is formed by forming the V-shaped wavy convex portion 36 and the concave portion 38 so that the amplitude of the V-shaped center (bending portion) is increased. The flow toward the intermediate portion of the two adjacent fin members 30 can be strengthened, and a stronger secondary flow can be generated.

  In the heat exchanger 20 of the embodiment, the burring pedestal portion 34 and the stepped portion 33 are formed around the burring hole 32, and the burring hole 32 and the burring pedestal portion 34 are formed at the same height and By forming the width so as to be the thickness of the thin plate, the fin member 30 can be easily laminated with the height of the burring hole 32 or the burring pedestal portion 34 between the adjacent fin members 30, and Since no gap is formed in the burring hole 32 of the adjacent fin member 30, heat transfer from the press-fitted tube 22 can be performed satisfactorily.

  In the heat exchanger 20 of the embodiment, the V-shaped wavy convex portion 36 and the concave portion 38 formed at the portion between the burring holes 32 along the flow direction of the second heat exchange medium are made larger in V shape. However, the V-shaped wavy convex portions 36 and the concave portions 38 formed at equal intervals in a line may be formed in the same size.

  In the heat exchanger 20 of the embodiment, the V-shaped wavy convex portion 36 and the concave portion 38 are formed such that the center amplitude of the V shape is larger than the amplitude of both sides of the V shape. It is good also as what forms so that it may become the same amplitude in any site | part of a character.

  In the heat exchanger 20 of the embodiment, the burring hole 32 and the burring pedestal portion 34 are formed to have the same height and the width of the stepped portion 33 is the thickness of the thin plate. 34 may be formed so as to have a different height from that of 34, or may be formed so that the width of the stepped portion 33 is different from the thickness of the thin plate.

  In the heat exchanger 20 of the embodiment, the burring pedestal portion 34 and the stepped portion 33 are formed around the burring hole 32. However, the burring pedestal portion 34 and the stepped portion 33 may not be formed. . Moreover, in the heat exchanger 20 of the Example, although the several notch 31 shall be formed in the outflow side of the 2nd heat exchange medium of the fin member 30, it is good also as what does not form such a notch 31. FIG.

  In the heat exchanger 20 of the embodiment, the plurality of tubes 22 are arranged in 3 rows and 8 columns, but the plurality of tubes 22 may be arranged in N rows and M columns. In this case, one row and M columns may be used.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited to such an Example at all, In the range which does not deviate from the summary of this invention, in various forms. Of course, it can be implemented.

  The present invention can be used in the heat exchanger manufacturing industry.

  20 heat exchanger, 22 tube, 30 fin member, 31 notch, 32 burring hole, 33 stepped portion, 34 burring pedestal portion, 36 convex portion, 38 concave portion.

Claims (5)

A plurality of thin fin-shaped fin members having a plurality of through holes arranged in alignment are stacked with a predetermined interval so that the plurality of through holes are aligned, and a plurality of tubes are press-fitted into the plurality of through holes so that heat can be transferred, A heat exchanger of a fin tube type in which a first heat exchange medium flowing through the plurality of tubes and a second heat exchange medium flowing between the fin members exchange heat;
The fin member is arranged so that the second heat exchange medium flows from the top side of the V-shape between the plurality of through holes that can be seen from the inflow side to the outflow side of the second heat exchange medium. 2 A plurality of V-shaped wavy irregularities are formed so as to be arranged in a line and at equal intervals from the inflow side to the outflow side of the heat exchange medium,
A heat exchanger characterized by that. The heat exchanger according to claim 1,
The V-shaped wavy irregularities are formed such that the amplitude of the V-shaped bent part is larger than the amplitude of the other part.
Heat exchanger. The heat exchanger according to claim 1 or 2,
Of the plurality of wavy unevennesses, the wavy unevenness in the portion where the through-hole is not formed on both sides is formed to be larger than the wavy unevenness in the portion where the through-hole is formed on both sides. ,
Heat exchanger. The heat exchanger according to any one of claims 1 to 3,
The plurality of through holes are arranged in a grid.
Heat exchanger. A heat exchanger according to any one of claims 1 to 4, wherein
The fin member has step portions formed around the plurality of through holes so that the fin member has the predetermined interval when the fin members are stacked.
Heat exchanger.

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