JP6375897B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger that includes a flat tube and fins and exchanges heat between fluid flowing in the flat tube and air.

  A heat exchanger provided with a flat tube and fins is known. In this heat exchanger, plate-like fins are laminated in parallel at a predetermined interval. Each of the stacked fins is formed with a large number of horizontally long notches from one end to the other end in the short direction of the fin. The plurality of notches are formed at regular intervals in the longitudinal direction of the fin. A flat tube is a heat transfer tube whose cross-sectional shape is an oval or a rounded rectangle. The flat tubes are respectively inserted in the above-described notches, and are arranged side by side at a certain interval. Moreover, the flowing water part which continues from an upper end to a lower end is formed in the other end side of a fin. For this reason, the condensed water generated on the fins can flow down to the lower end of the fins along the flowing water part, so that the drainage of the heat exchanger can be improved.

  In such a heat exchanger, there is a method disclosed in Patent Document 1 as one of methods for increasing the heat exchange efficiency. As shown in FIG. 5, the louver 350 formed by raising the fin 320 in the vertical direction in a part of the region sandwiched by the flat tube 330 from the vertical direction on the fin 320 is indicated by the white arrow. A plurality are formed with respect to the ventilation direction. The louver 350 makes the air flowing along the fins 320 turbulent, and the air having a temperature difference hits the fins 320, thereby improving the heat exchange efficiency.

JP 2000-234833 A

  However, when the heat exchanger functions as an evaporator, the upper flat surface 330a at the top of the flat tube 330 is horizontal, so that condensed water tends to accumulate on the upper flat surface 330a of the flat tube 330. In particular, the condensed water is difficult to flow at a location where the lower end 350 a of the louver 350 is close to the upper flat surface 330 a of the flat tube 330. Therefore, there is a possibility that condensed water may accumulate on the upper flat surface 330a of the flat tube 330, and the area where the air and the heat exchanger can be contacted decreases. Therefore, when the heat exchanger is an evaporator, the heat exchange efficiency is deteriorated. there were.

  Then, this invention aims at improving the heat exchange efficiency of a heat exchanger by enabling the drainage of the condensed water collected on the flat surface of the flat tube to be efficiently drained.

  In order to solve the above-described problem, the present invention provides a plurality of flat tubes arranged vertically with a first interval, and a plurality of flat tubes with a second interval and intersecting with the plurality of flat tubes. A heat exchanger having a plurality of plate-like fins for partitioning between adjacent flat tubes and forming a plurality of ventilation paths for ventilating air, wherein the fins define a ventilation path A bead-shaped water guide portion formed so as to protrude to one surface side of the fin extends in the vicinity of the upper flat surface of the flat tube in the heat transfer portion. To do.

  Moreover, the water conveyance part is formed over the other end side from the one end side of the ventilation direction of the said flat tube, It is characterized by the above-mentioned.

  Moreover, the water conveyance part inclines below toward the downstream from the upstream of the ventilation direction of air, It is characterized by the above-mentioned.

  Further, a plurality of water guide portions are formed in the vertical direction.

  According to the heat exchanger of the present invention, the condensed water accumulated on the flat surface of the flat tube can be drained efficiently, and the heat exchange efficiency of the heat exchanger can be improved.

It is the perspective view which showed the whole heat exchanger concerning this invention. It is the front view which showed the whole heat exchanger concerning this invention. It is sectional drawing which showed the cross section from the side direction of the heat exchanger concerning this invention (along AA of FIG. 2). (A) is the side view which showed the louver concerning this invention from the side surface direction, (B) is sectional drawing which followed the cross section of the water conveyance part (along BB of FIG. 3). It is sectional drawing which showed the cross section from the side surface direction of the heat exchanger concerning the former similarly to FIG.

  A heat exchanger 100 according to the present invention is a heat exchanger provided with fins 120 and flat tubes 130 as shown in FIGS. 1 and 2.

  The heat exchanger 100 of the present invention includes a first header 110a, a second header 110b, a plurality of flat tubes 130, and a plurality of fins 120. The first header 110a, the second header 110b, the flat tube 130, and the fin 120 are all members made of an aluminum alloy, and are joined to each other by brazing.

  Both the first header 110a and the second header 110b are formed in an elongated cylindrical shape with both ends closed. The first header 110 a is disposed on one end side of the heat exchanger 100, and the second header 110 b is disposed on the other end side of the heat exchanger 100. In addition, let each axial direction of the 1st header 110a and the 2nd header 110b be the up-down direction of the heat exchanger 100. FIG.

  The flat tube 130 is a heat transfer tube whose cross-sectional shape is an oval or a rounded rectangle, and extends in a direction orthogonal to the fins 120, with the upper flat surface 131 being the upper portion and the lower flat surface 132 being the lower portion. ing. The flat tube 130 is provided with a plurality of refrigerant channels through which refrigerant flows. The refrigerant channels extend in the longitudinal direction of the flat tube 130 and are arranged at equal intervals in the width direction of the flat tube 130. Yes. In the heat exchanger 100, the flat tubes 130 are spaced at intervals designed in consideration of the heat exchange efficiency and the ventilation resistance of the heat exchanger 100 so that the upper flat surface 131 and the lower flat surface 132 face each other. They are arranged side by side at a certain first interval. Each flat tube 130 has one end inserted into the first header 110a and the other end inserted into the second header 110b.

  The fin 120 is formed into a vertically long plate shape by pressing a metal plate. As shown in FIG. 3, the fin 120 has a horizontally long notch 140 extending from one end in the short direction of the fin 120 toward the other end of the fin 120 in the longitudinal direction (vertical direction) of the fin 120. Many are formed at intervals. When the flat tube 130 is inserted into the notch 140, the flat tube 130 is disposed at a first interval in the vertical direction. Further, as shown in FIG. 1, a plurality of fins 120 are provided at a second interval, which is an interval designed in consideration of heat exchange efficiency and ventilation resistance of the heat exchanger 100 in the longitudinal direction of the flat tube 130. It is arrange | positioned and it divides into the some ventilation path through which the air flows between the flat tubes 130 adjacent to an up-down direction. The fins 120 and the flat tubes 130 are orthogonal to each other, and as shown in FIG. 3, the surface located between the flat tubes 130 adjacent to each other on the upper and lower sides of the surfaces of the fins 120 exchanges heat with the passing air. It becomes the heat transfer part 121. Further, the surface on the other end side from the notch portion 140 becomes a flowing water portion (communication portion) 122 continuously connected from the upper end to the lower end of the fin 120.

  In the heat transfer section 121 of the fin 120, a louver 150 is formed by cutting and raising a part of the heat transfer section 121 in the airflow direction. The louver 150 is cut into a rectangular shape as shown in FIG. 4A, bent so as to be symmetrical with respect to the center line 123 of the rectangular plate portion 124 formed thereby, and a white arrow Are formed side by side in the air ventilation direction shown in FIG. In addition, a plurality of water guiding portions 160 extending in the direction of air flow are formed below the louver 150. This water guide part 160 protrudes to the one surface side of the fin 120 by press work between the lower end of the louver 150 and the upper flat surface 131 of the flat tube 130 in the heat transfer part 121 as shown in FIG. Thus, the other surface side of the fin 120 is formed in a bead shape so as to be recessed. In addition, the water guide part 160 may be formed so that one surface side of the fin 120 is recessed and the other surface side of the fin 120 protrudes. The water guide section 160 is formed in an elongated shape and is inclined downward from the windward side toward the leeward side. Further, a plurality of water guiding portions 160 are formed at regular intervals in the vertical direction. The lowermost water guide portion among the formed water guide portions 160 is a lower water guide portion 160a, and extends from one end on the leeward side to the other end on the windward side in the width direction of the flat tube 130. The lower water guide section 160 a collects the condensed water generated in the heat transfer section 121, so that the condensed water can be guided to the flowing water section 122. Moreover, water conveyance parts (160b, 160c) other than the lower water conveyance part 160a are shorter than the lower water conveyance part 160a, and are arrange | positioned in the leeward side of the heat-transfer part 121. FIG. Thereby, the condensed water produced on the windward side of the heat transfer section 121 can flow down to the lower water guide section 160a.

  Hereinafter, the water guide section 160 formed in a bead shape will be described in detail. A convex part 165 is formed on one surface side of the heat transfer part 121, and an upper side of the convex part 165 is a wall part 164. A concave portion 163 is formed on the other surface side of the heat transfer portion 121 and on the back side of the convex portion 165. When the condensed water generated on the one surface side of the heat transfer section 121 flows down to the water conveyance section 160, it is received by the wall section 164 above the water conveyance section 160, and is flowed to the leeward side by the force of air or the like to flow into the water flow section 122. Led up to. Further, the condensed water collected on the upper flat surface 131 of the flat tube 130 flows into the space 162 between the convex portions 165 on one surface side of the water guiding portion 160 or the concave portion 163 formed on the other surface side of the water guiding portion 160, and the capillary tube It is led to the flowing water part 122 by the phenomenon.

  In the present embodiment, all the water guiding portions 160 are formed so as to protrude to the one surface side of the fins 120, but the present invention is not limited to this, and a part of the plurality of water guiding portions 160 is disposed on the other surface. You may form so that it may protrude to the side. In the present embodiment, the two water guide sections (160b, 160c) arranged on the leeward side of the heat transfer section 121 have the same length, but the present invention is not limited to this. Of the water conduits (160b, 160c), the lower water conduit 160b may be longer than the upper water conduit 160c. Thereby, the condensed water generated in the heat transfer section 121 is easily drawn between the water guide sections 160.

  According to the heat exchanger of the present invention, even if the fins of the heat exchanger are provided with louvers, the condensed water collected on the flat surface of the flat tube is efficiently flowed to the water conveyance section. It can be improved.

DESCRIPTION OF SYMBOLS 100 Heat exchanger 120 Fin 130 Flat tube 150 Louver 160 Water conveyance part

Claims (4)

A plurality of flat tubes arranged vertically with a first interval;
A plurality of plate-shaped fins that form a plurality of ventilation paths that are spaced apart from each other and that are adjacent to each other among the plurality of flat tubes and allow air to flow through the second space. A heat exchanger having
The fin has a heat transfer section that partitions the ventilation path,
The heat transfer part has a louver,
Of the heat transfer part, a bead-shaped water guide part formed so as to protrude to one surface side of the fin extends below the louver and in the vicinity of the upper flat surface of the flat tube. A heat exchanger characterized by that.   2. The heat exchanger according to claim 1, wherein the water guide portion is formed from one end side to the other end side in the ventilation direction of the flat tube.   The heat exchanger according to claim 1 or 2, wherein the water guide portion is inclined downward from the upstream side in the air flow direction toward the downstream side. The heat exchanger according to any one of claims 1 to 3, wherein a plurality of the water guide portions are formed in a vertical direction.

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