JP2012237538A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a degradation in heat exchange effectiveness of a heat exchanger, even if a frost is formed on a louver.SOLUTION: A fin 50 includes a plate-like part 60 which is arranged so that a plate-thickness direction crosses an air stream direction F, and a plurality of louvers 61, 62, 63, 64, ..., which protrude in the plate-thickness direction from the plate-like part 60 and arranged along the air stream direction F. Flat heat transfer pipes 41, 42, 43, ..., are inserted in the fin 50 to cross the air stream direction F. Especially, the louvers 61, 62, 63, 64, ..., contain an upper stream side louver positioned on the upper stream side in the air stream direction F, and a lower stream side louver positioned on the lower stream side in the air stream direction F. The height from the plate-like part 60 up to the tip end in protrusion direction of the lower stream side louver is larger than the height of the upper stream side louver.

Description

  The present invention relates to a heat exchanger, and more particularly to an air-cooled and ventilated heat exchanger.

  A heat exchanger for heating or cooling air is used in an outdoor unit of an air conditioner, a heat source unit of a hot water supply device, or the like. As a kind of heat exchanger, in addition to a type in which a heat transfer tube having a circular cross section is inserted into a fin, for example, a stacked heat exchanger as shown in Patent Document 1 (Japanese Patent Laid-Open No. 2010-2138) is cited. It is done. In a laminated heat exchanger, a plurality of flat heat transfer tubes are arranged in a state in which a flat portion extending in a horizontal plane is oriented in the vertical direction, and fins are provided in the ventilation space sandwiched between adjacent flat heat transfer tubes. It has an arranged configuration.

  Moreover, there exists a heat exchanger shown by patent document 2 (Unexamined-Japanese-Patent No. 2005-201492). In the heat exchanger of Patent Document 2, a plurality of fins are arranged substantially perpendicular to a flat heat transfer tube extending in the horizontal direction, and a plurality of louvers are provided at predetermined intervals along the air flow direction. It has been. The louver extends in the vertical direction, and its length increases sequentially from the upstream side to the downstream side in the air flow direction.

  By the way, since the outdoor unit and the heat source unit are installed outdoors, frost adheres to the heat exchanger in these units when the outside air is low such as winter. This frost becomes a factor that obstructs the passage of air in the heat exchanger, and as a result, reduces the heat exchange rate of the heat exchanger.

  Moreover, when the louver of patent document 2 is employ | adopted in the laminated heat exchanger of patent document 1, it becomes difficult to ensure the length of the louver of a perpendicular direction on the structure of a laminated heat exchanger. . Therefore, when the louver on the upstream side of the air flow is frosted, the length of the louver in the vertical direction is not sufficient, so that the air flow hardly reaches the louver on the downstream side. Therefore, the heat exchanger cannot sufficiently exchange heat with air, and the heat exchange rate of the heat exchanger still remains lowered.

  Therefore, an object of the present invention is to prevent a reduction in the heat exchange rate of the heat exchanger even if frost adheres to the louver.

  A heat exchanger according to a first aspect of the present invention is an air-cooled and ventilated heat exchanger, and includes fins and a plurality of heat transfer tubes. The fin has a plate-like portion and a plurality of protruding portions. The plate-like portion is arranged such that the plate thickness direction intersects the air flow direction generated by ventilation. The plurality of projecting portions project from the plate-shaped portion in the plate thickness direction and are arranged along the air flow direction. The plurality of heat transfer tubes are inserted into the fins so as to intersect the air flow direction. The plurality of protrusions have an upstream protrusion and a downstream protrusion. The upstream protrusion is located on the upstream side in the air flow direction. The downstream protrusion is located on the downstream side in the air flow direction. And the height from the plate-shaped part to the protrusion direction front-end | tip part in a downstream protrusion part is larger than the height from a plate-shaped part to the protrusion direction front-end | tip part in an upstream protrusion part.

  According to this heat exchanger, the height of the downstream protrusion is higher than that of the upstream protrusion. Therefore, even if frost adheres to the upstream protrusion, the air reaches the downstream protrusion. It will be. Therefore, since air can also perform heat exchange in the downstream protrusion, it is possible to prevent a decrease in the heat exchange rate of the heat exchanger.

  The heat exchanger which concerns on the 2nd viewpoint of this invention is a heat exchanger which concerns on a 1st viewpoint, Comprising: The length which the downstream protrusion part protrudes from a plate-shaped part is the upstream protrusion part from a plate-shaped part. It is larger than the protruding length.

  Thereby, the height of a downstream protrusion part can be easily made higher than an upstream protrusion part.

  The heat exchanger which concerns on the 3rd viewpoint of this invention is a heat exchanger which concerns on a 1st viewpoint or a 2nd viewpoint, Comprising: The inclination angle with respect to the plate-shaped part of a downstream protrusion part is a plate-shaped part of an upstream protrusion part It is larger than the inclination angle with respect to.

  Thereby, the height of a downstream protrusion part can be easily made higher than an upstream protrusion part.

  A heat exchanger according to a fourth aspect of the present invention is a heat exchanger according to any one of the first aspect to the third aspect, wherein the height from the plate-like portion to the protrusion direction tip in each protrusion is: It becomes higher gradually from the upstream side to the downstream side in the air flow direction.

  According to this heat exchanger, since the height of the protruding portion is gradually increased along the air flow direction, air is likely to reach each higher protruding portion.

  A heat exchanger according to a fifth aspect of the present invention is a heat exchanger according to any one of the first aspect to the third aspect, wherein the height from the plate-like portion to the protrusion direction tip in each protrusion is: As it goes from the upstream side to the downstream side in the air flow direction, it becomes higher for every predetermined number of protrusions.

  According to this heat exchanger, the height of the protrusions is increased for each predetermined number of protrusions along the air flow direction, so that air easily reaches each higher protrusion.

  A heat exchanger according to a sixth aspect of the present invention is the heat exchanger according to any one of the first to fifth aspects, wherein each protruding portion is formed by cutting and raising from a part of the plate-like portion. Yes.

  As a result, since the protruding portion is integrally formed with the plate-like portion, it is not necessary to form the protruding portion by a member different from the plate-like portion, and the fin including the protruding portion is easily formed by a mold or the like. be able to.

  The heat exchanger which concerns on the 7th viewpoint of this invention is a heat exchanger which concerns on either of the 1st viewpoint to the 6th viewpoint, Comprising: A heat exchanger defrost operation which removes the frost which formed in the heat exchanger It is used for a refrigeration apparatus capable of performing

  This heat exchanger is used not only for the structure of the protrusions described above but also for a refrigeration apparatus capable of performing a defrosting operation. Thereby, even if frost adheres to each protrusion part etc. of a heat exchanger, frost melt | dissolves by a defrost operation and it becomes a water droplet. Therefore, it can prevent that the heat exchange rate of a heat exchanger falls more.

  According to the heat exchanger which concerns on the 1st viewpoint of this invention, since air can heat-exchange in a downstream protrusion part, the fall of the heat exchange rate of a heat exchanger can be prevented.

  According to the heat exchanger according to the second and third aspects of the present invention, the height of the downstream protrusion can be easily made higher than that of the upstream protrusion.

  According to the heat exchanger concerning the 4th viewpoint and the 5th viewpoint of the present invention, air becomes easy to reach each higher projection part.

  According to the heat exchanger according to the sixth aspect of the present invention, since the protruding portion is integrally formed with the plate-like portion, it is not necessary to form the protruding portion by a member different from the plate-like portion, and the protruding portion is not formed. The fin including it can be easily formed by a mold or the like.

  According to the heat exchanger which concerns on the 7th viewpoint of this invention, it can prevent that the heat exchange rate of a heat exchanger falls more.

The external view of the heat exchanger which concerns on this embodiment. The enlarged view of the part shown by A in FIG. The schematic perspective view of the heat exchanger which concerns on this embodiment. It is a cross section at the time of cut | disconnecting in the surface shown by IV-IV in FIG. 2, Comprising: The side view at the time of seeing the heat exchanger of FIG. 3 from the right side. The cross-sectional view of a fin at the time of cut | disconnecting by the surface shown by VV in FIG. The figure for demonstrating the process in which a louver is cut and raised. The figure for demonstrating the flow of air when a louver is arrange | positioned as shown in FIG. The cross-sectional view of the fin which concerns on the modification A. The figure showing the state of the fin before the louver is cut and raised in modification A. The cross-sectional view of the fin which concerns on the modification B. The cross-sectional view of the fin which concerns on the modification C.

  Hereinafter, the heat exchanger according to the present invention will be described in detail with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

(1) Outline FIG. 1 is an external view of a heat exchanger 10 according to an embodiment of the present invention. The heat exchanger 10 according to the present embodiment is provided inside an outdoor unit of an air conditioner and can function as a refrigerant evaporator or a refrigerant radiator.

  Although not shown in the drawings, in this embodiment, the air conditioner is an example of a separate type configured by being divided into an outdoor unit installed outdoors and an indoor unit installed indoors. take. Examples of the operation type of the air conditioner include a cooling operation and a heating operation, and a defrost operation for removing frost attached to the heat exchanger 10 in the outdoor unit.

  The heat exchanger 10 according to the present embodiment is an air-cooled and ventilated heat exchanger. For this reason, the air conditioner is provided with a blower (not shown) that supplies an air flow to the heat exchanger 10. Hereinafter, the air flow direction is indicated as “F” in the drawings.

  Here, the air blower may be disposed on the downstream side of the heat exchanger 10 or on the upstream side with respect to the air flow direction F generated by itself. Moreover, the air flow direction F can be freely changed by the other member etc. which form a ventilation flow path. When the air whose direction has been freely changed passes through the heat exchanger 10, the heat exchanger is arranged so that the air passes in a substantially horizontal direction.

  In the state where the air from the blower is supplied to the heat exchanger 10 functioning as the refrigerant evaporator, the heat exchanger 10 performs heat exchange using the air supplied by the blower. In the heat exchange between the refrigerant and the air in this case, the refrigerant flowing inside the flat heat transfer tube (described later) is heated and evaporated by the heat of the air supplied by the blower. On the other hand, the air that has passed through the heat exchanger 10 is cooled by the heat of the refrigerant flowing inside the flat heat transfer tube, and the temperature decreases. At this time, since the surface temperature of the heat exchanger 10 is lower than the temperature of the supplied air, condensed water is generated on the surface of the heat exchanger 10 when the supplied air is cooled. Sometimes. The condensed water becomes frost at the time of low outside air and adheres mainly to the surface of the heat exchanger 10.

  Even if frost adheres to the surface of the heat exchanger 10, the heat exchanger 10 according to the present embodiment has a structure that prevents the heat exchange efficiency from being reduced by the frost.

(2) Structure of heat exchanger Next, the structure of the heat exchanger 10 which concerns on this embodiment is explained in full detail. As shown in FIG. 1, the heat exchanger 10 mainly includes a diversion header 20, a merge header 30, a flat heat transfer tube group 40, and fins 50.

  In the following description, expressions indicating directions such as “up”, “down”, “right”, “vertical”, “horizontal” and the like are used as appropriate. However, in these cases, the heat exchanger 10 is in the state shown in FIG. Each direction is shown in the state where it is installed. Further, as shown in FIG. 1, the side on which the heat exchanger 10 can be viewed is referred to as “front side”, and “upper surface side” and “lower surface side” are grasped on the basis of the front side.

(2-1) Shunt header and merge header As shown in FIG. 1, the longitudinal direction of the shunt header 20 and the merge header 30 are both vertical. A flat heat transfer tube group 40 is connected to the diversion header 20 and the merge header 30. Specifically, the diversion header 20 and the merge header 30 extend in parallel at a predetermined distance from each other, and the flat heat transfer tubes 41, 42, 43... In the flat heat transfer tube group 40 along the longitudinal direction thereof. They are connected in an array.

  A liquid state refrigerant or a gas-liquid two-phase state refrigerant is fed into the diversion header 20 from the direction R1 in FIG. The refrigerant supplied to the diversion header 20 flows to the merging header 30 by being divided into a plurality of flow paths of the flat heat transfer tubes 41, 42, 43,.

  The merging header 30 is provided at the same position as the diversion header 20 in the component in the air flow direction F, and the refrigerant has flowed from the plurality of flow paths of the plurality of flat heat transfer tubes 41, 42, 43,. And the refrigerant is sent out in the direction R2 (specifically, opposite to the direction R1) in FIG.

(2-2) Flat Heat Transfer Tube Group The flat heat transfer tube group 40 is composed of a plurality of flat heat transfer tubes (corresponding to heat transfer tubes) 41, 42, 43,.

  The flat heat transfer tubes 41, 42, 43,... Are formed of aluminum or an aluminum alloy, and are inserted into the fins 50 so as to intersect (specifically, substantially perpendicular) to the air flow direction F generated by ventilation. Has been. More specifically, the flat heat transfer tubes 41, 42, 43,... Are arranged side by side at a predetermined distance in the vertical direction, as shown in FIGS. 3 and 4, as shown in FIG. And flat surfaces 41a, 41b, 42a, 42b, 43a, 43b,... Spreading in a horizontal plane substantially parallel to the air flow direction F generated in the horizontal direction by ventilation. The flat surfaces 41a, 41b, 42a, 42b, 43a, 43b,... Spread horizontally in the vertical upper side and the vertical lower side. As described above, since the flat surfaces 41a, 41b, 42a, 42b, 43a, 43b, ... are spread horizontally, the flat heat transfer tubes 41, 42, 43, ... are inclined from the horizontal direction. Compared with the case where it arrange | positions, the ventilation resistance with respect to the air flow which is flowing along a horizontal direction can be restrained small.

  Each of the flat heat transfer tubes 41, 42, 43,... Has a plurality of refrigerant flow paths P that allow the refrigerant to flow in a direction substantially orthogonal to the air flow direction F, as shown in FIG. It is a heat transfer tube called a multi-hole tube. The plurality of refrigerant flow paths P are formed along the air flow direction F in the flat heat transfer tubes 41, 42, 43,... In order to form the flat heat transfer tubes 41, 42, 43,. It is provided side by side. The pipe diameter of each refrigerant flow path P is very small, and one has a square shape of about 250 μm × about 250 μm, which is a so-called microchannel heat exchanger.

(2-3) Fins As shown in FIGS. 2 to 4, the fins 50 are adjacent flat heat transfer tubes 41, 42, 43... At least between the adjacent flat heat transfer tubes 41, 42, 43,. .. being arranged joined to at least one of

  More specifically, the fin 50 is formed between the adjacent flat heat transfer tubes 41, 42, and between the adjacent flat heat transfer tubes 42, 43. The first fin 51 and the second fin 52 are provided separately from each other. Each of the first fin 51 and the second fin 52 has a so-called wave shape in which a peak portion and a valley portion are repeatedly formed in a front view of the heat exchanger 10 in FIG. It is made of an alloy.

  The first fins 51 are arranged so as to be sandwiched between the flat heat transfer tubes 41 and 42, and the upper surface side of the mountain portion is the upper surface of the flat heat transfer tube 42 with respect to the flat surface 41 b that is the lower surface side of the flat heat transfer tube 41. The lower surface side of the valley portion is in contact with the flat surface 42a that is the side. The second fin 52 is disposed so as to be sandwiched between the flat heat transfer tubes 42 and 43, and the upper surface side of the mountain portion is the upper surface of the flat heat transfer tube 43 with respect to the flat surface 42 b that is the lower surface side of the flat heat transfer tube 42. The lower surface side of the valley portion is in contact with the flat surface 43a that is the side. And each part which the flat heat-transfer tube group 40 and the fin 50 are contacting as mentioned above is adhering by brazing welding. Thereby, the heat of the refrigerant flowing in the flat heat transfer tube group 40 is transferred not only to the surface of the flat heat transfer tube group 40 but also to the surfaces of the fins 50. Therefore, the heat transfer area of the heat exchanger 10 is increased, the heat exchange efficiency is improved, and the heat exchanger 10 itself can be made compact. The heat exchanger 10 according to this embodiment is a so-called stacked heat exchanger in which flat heat transfer tube groups 40 and fins 50 are alternately stacked in the vertical direction. Therefore, the space | interval of each flat heat exchanger tube 41,42,43, ... can be ensured easily by the interposing fin 50, and the assembly workability | operativity of the heat exchanger 10 can be improved.

(2-4) Plate-shaped part and louver The fin 50 having the above-described configuration includes a plate-shaped part 60 and a plurality of louvers 61, 62, 63, 64,. Yes. As shown in FIGS. 3 and 4, the plate-like portion 60 is arranged so that the plate thickness direction of the fin 50 intersects the air flow direction F. The part that spreads flatly up to the part. The flat surface of the plate-like portion 60 is substantially along the air flow direction F. With such a configuration of the plate-like portion 60, the ventilation resistance due to the provision of the fins 50 can be kept small. Here, the plate | board thickness of the fin 50 which concerns on this embodiment is about 0.1 mm, and the distance Y (FIG. 5) between the plate-shaped parts 60 is about 1.5 mm.

  As shown in FIG. 5, the plurality of louvers 61, 62, 63, 64,... Protrude from the plate-like portion 60 in the plate thickness direction, and are arranged along the air flow direction F. As shown in FIG. 4, the louvers 61, 62, 63, 64,... Have an elongated rectangular shape along the arrangement direction of the adjacent flat heat transfer tubes 41, 42, 43, that is, the vertical direction. have.

  Such louvers 61, 62, 63, 64,... Are formed by cutting and raising from a part of the plate-like portion 60. Specifically, the louvers 61, 62, 63, 64,... Are cut in a plate-like aluminum or aluminum alloy along the solid line in FIG. 6, and mountain-folded along the dotted line in FIG. The plate-like portion 60 is integrally formed by performing valley folding along the one-dot chain line. In addition, the angle which the parts 61a, 62a, 63a, ... of the louvers 61,62,63, ... incline with respect to the plate-shaped part 60 and the parts 61b, 62b, 63b, ... of the louvers 61 It bends so that the angle which inclines with respect to the plate-shaped part 60 may become equal. Therefore, the portions 61a, 61b, 62a, 62b, 63a, 63b,... Adjacent to the louvers 61, 62, 63,. Although they protrude in opposite directions, the inclination angle with respect to the plate-like portion 60 is the same. That is, the plate-like portion 60 is said to be a substantially flat portion that does not protrude in the plate thickness direction at positions excluding the louvers 61, 62, 63, 64,. be able to. And it can be said that the louvers 61, 62, 63, 64,... Are cut and raised portions arranged in the air flow direction F on both surfaces of the plate-like portion 60. In the present embodiment, for convenience of explanation, the pair of portions 61a and 61b, 62a and 62b, 63a and 63b,... Correspond to one louver 61, 62, 63,. I do.

  A predetermined interval T1 is provided in the horizontal direction for each of the pair of portions 61a and 61b, 62a and 62b, 63a and 63b,..., And this interval is the horizontal direction of the portion 60a of the plate-like portion 60. It is larger than the width T2. .. Of the louvers 61, 62, 63,... In the horizontal direction in FIG. 6 is the horizontal width in the horizontal direction in FIG. 6 of the portions 61b, 62b, 63b,. Equal to width.

  In the present embodiment, the louvers 61, 62, 63, 64,... Are formed in this way, so that the louvers 61, 62, 63, 64,. In addition, the airflow direction F is inclined so as to incline toward the upstream side. In the present embodiment, any louver 61, 62, 63, 64,... And the contact point of the plate-like portion 60 and the louvers 61, 62, 62, 63, 64,. Further, the distance D between the contacts, that is, the distance between the contacts of the plate-like portion 60 (that is, the distance between the louvers) is all taken as an example.

  Moreover, below, the louver located in the upstream of the air flow direction F among the plurality of louvers 61, 62, 63, 64,... Arranged along the air flow direction F for convenience of explanation, “Upstream louver (corresponding to upstream protrusion)”. Conversely, a louver located on the downstream side in the air flow direction F is referred to as a “downstream louver (corresponding to a downstream protrusion)”.

  And the louver 61, 62, 63, 64, ... which concerns on this embodiment differs in the height which protrudes from the plate-shaped part 60 by the upstream louver and the downstream louver. For example, in FIG. 5, it can be said that the louvers 63 and 64 are downstream louvers with respect to the louvers 61 and 62. In this case, the heights h3 and h4 of the projecting direction tip portions ti3 and ti4 in the downstream louvers 63 and 64 from the plate-like portion 60 are the projecting direction tip portions ti1 and ti1 in the louvers 61 and 62 serving as the upstream louvers. It is larger than the heights h1 and h2 from the plate-like portion 60 of ti2. In particular, in the present embodiment, the heights h1, h2, h3 from the plate-like portion 60 to the projecting direction tip portions ti1, ti2, ti3, ti4,... Of each louver 61, 62, 63, 64,. , H4,... Gradually increase from the upstream side in the air flow direction F toward the downstream side. Therefore, “h1 <h2 <h3 <h4,...” Holds as the height relationship between the louvers 61, 62, 63, 64,.

  More specifically, as shown in FIGS. 5 and 6, the protruding lengths le of the louvers 61, 62, 63, 64,... Protruding from the plate-like portion 60 (specifically, the louver 61 , 62, 63,... Of the portions 61 a, 61 b, 62 a, 62 b, 63 a, 63 b,. However, in this embodiment, the inclination angles θ1, θ2, θ3, θ4,... Of the louvers 61, 62, 63, 64,. The inclination angles θ1, θ2, θ3, θ4,... Gradually increase toward the downstream louver. Therefore, as the relationship between the inclination angles θ1, θ2, θ3, θ4,... Of each louver according to the present embodiment, “θ1 <θ2 <θ3 <θ4,.

  The protrusion length le referred to here corresponds to the horizontal width of each portion 61a, 61b, 62a, 62b, 63a, 63b,... Of the louvers 61, 62, 63,. . Accordingly, in the present embodiment, the louvers 61, 62, 63, 64,... Protrude the same length in opposite directions with the plate-like portion 60 interposed therebetween, and the portions 61a and 61b are plate-like. The height from the part 60 is the same (h1). Similarly, the portions 62a and 62b have the same height from the plate-like portion 60 (h2), and the portions 63a and 63b have the same height from the plate-like portion 60 (h3). ).

  According to the louvers 61, 62, 63, 64,... Having such a configuration, as shown in FIG. 7, when the outside air is low, the upstream end portion in the air flow direction F of the plate-like portion 60, and each louver. Frost fr0, fr1, fr2, fr3, fr4,... Adhere to the projecting direction tip portions ti1, ti2, ti3, ti4,. In particular, the upstream louver has a large amount of frost adhering to the downstream louver because there is a large amount of air in contact therewith. However, each louver 61, 62, 63, 64,... Has a height that increases in order along the air flow direction F. Therefore, even if the louvers 61, 62, 63, 64,. Even if it adheres, air flows along the surface of each louver 61, 62, 63, 64, ... between adjacent louvers 61,62,63,64, .... Thereby, even if frost adheres to each louver 61, 62, 63, 64,..., The air is inclined to the inclined surface of each louver 61, 62, 63, 64,. It touches the part of the plate-like part 60 between 62, 63, 64,... And heat exchange is performed between the air and the refrigerant. That is, in this embodiment, it can be said that the surface where the air touches the fins 50 is secured even when frost is formed by making the height of the downstream louver higher than the height of the upstream louver. In FIG. 7, the air flow is represented by solid arrows.

  Furthermore, in this embodiment, since the inclination angles θ1, θ2, θ3, θ4,... Of the louvers 61, 62, 63, 64,. When this happens, this water droplet does not collect between the louvers 61, 62, 63, 64,. Since the adjacent louvers have different inclination angles, forces such as surface tension and friction force applied to the water droplets do not balance on the surfaces of the adjacent louvers facing each other, and downward force acts on the water droplets. It is. Therefore, it is possible to prevent water droplets after the defrost operation from becoming frost again and adhering to the louver between the louvers 61, 62, 63, 64,.

  Here, the actual values of the inclination angles θ1, θ2, θ3, θ4,... Of the louvers 61, 62, 63, 64,... Are the air necessary for the heat exchanger 10 to perform heat exchange. Taking into account the amount of refrigerant, the amount of refrigerant, the ease of air flow in the fins 50, the outside air temperature, and the like, it is appropriately determined by desktop calculation, simulation, experiment, and the like. For example, the inclination angles θ1, θ2, θ3, θ4,... Are determined to be values in the range of about 10 degrees to about 45 degrees. As an example, the inclination angles θ1, θ2, θ3, θ4,. In order, “about 10 degrees”, “about 20 degrees”, “about 30 degrees”, and “about 40 degrees” can be mentioned. In this case, if the length le in the protruding direction of the louvers 61, 62, 63, 64,... Is "0.8 mm", the height h1 of each louver 61, 62, 63, 64,. , H2, h3, h4,... Are sequentially “about 0.139 mm”, “about 0.274 mm”, “about 0.400 mm”, and “about 0.514 mm”.

(3) Flow of Refrigerant A mode in which the refrigerant flows into the heat exchanger 10 having the above configuration and the refrigerant flows out of the heat exchanger 10 will be briefly described. Here, a case where the air conditioner performs a heating operation, that is, a case where the heat exchanger 10 functions as an evaporator will be described.

  First, a liquid refrigerant or a gas-liquid two-phase refrigerant flows into the diversion header 20. This refrigerant is divided approximately equally into the refrigerant flow paths P of the flat heat transfer tubes 41, 42, 43,... In the flat heat transfer tube group 40.

  While the refrigerant flows through the refrigerant flow paths P of the flat heat transfer tubes 41, 42, 43,..., The fins 50 and the flat heat transfer tube groups 40 themselves are warmed by the air supplied by the blower (not shown). The refrigerant flowing inside the refrigerant flow path P is also warmed. By applying heat to the refrigerant in this way, the refrigerant gradually evaporates into a gas phase state in the process of passing through the refrigerant flow path P. In this process, moisture in the air cooled by the heat of the refrigerant adheres to the surface of the heat exchanger 10 as condensed water.

  Thereafter, the refrigerant in a gas phase state passes through each refrigerant flow path P such as the flat heat transfer tubes 42 and 43, and then merges by the merge header 30 to become one refrigerant flow and flows out from the heat exchanger 10. I will do it.

(4) Features (4-1)
A plurality of louvers 61, 62, 63, 64,... Of the fin 50 according to the present embodiment protrude from the plate-like portion 60 in the plate thickness direction and are arranged along the air flow direction F. In particular, the louvers 61, 62, 63, 64,. The height (for example, h3, h4) from the shape part 60 is the height (for example, h1) to the protrusion direction tip part (for example, the protrusion direction tip part ti1, ti2 of the louvers 61, 62) located on the upstream side. , H2). Therefore, even if frost adheres to the projecting direction tip portions ti1, ti2, ti3, ti4,... Of the louvers 61, 62, 63, 64,. .. Reach between the louvers 61, 62, 63, 64,... Including the downstream louvers along the inclined surfaces of 62, 63, 64,. Therefore, air can also perform heat exchange in the downstream louver, and can prevent a decrease in the heat exchange rate of the heat exchanger.

(4-2)
In particular, in the present embodiment, in the heat exchanger 10, the inclination angle (for example, the inclination angle θ4 of the louver 64) of the louver on the downstream side in the air flow direction F is set to the inclination angle ( For example, the height of the downstream louver can be easily made higher than that of the upstream louver by making it larger than the inclination angle θ1) of the louver 61.

(4-3)
In the present embodiment, the heights h1, h2, h3 from the plate-like portion 60 to the projecting direction tip portions ti1, ti2, ti3, ti4,... Of each louver 61, 62, 63, 64,. , H4,... Gradually increase along the air flow direction F from the upstream side of the direction F toward the downstream side. This makes it easier for the air to reach the louvers 61, 62, 63, 64,... Having the heights h1, h2, h3, h4,.

(4-4)
Further, in the heat exchanger 10 according to the present embodiment, the louvers 61, 62, 63, 64,... Are formed by cutting up from a part of the plate-like portion 60. That is, each louver 61, 62, 63, 64,... Is integrally formed with the plate-like portion 60. Therefore, it is not necessary to form the louvers 61, 62, 63, 64,... On the plate-like portion 60 with another member, and the fin 50 including the louvers 61, 62, 63, 64,. It can be easily formed by a mold or the like.

(4-5)
In addition, the heat exchanger 10 according to the present embodiment has not only the above-described louver configuration but also an outdoor unit of an air conditioner that can perform a defrost operation to remove frost formed on the heat exchanger 10. It is used. Even if the louvers 61, 62, 63, 64,... Are frosted due to the low outside air, the frost is melted by the defrost operation and becomes water droplets. Therefore, it can prevent that the heat exchange rate of the heat exchanger 10 falls more.

(5) Modification (5-1) Modification A
In the above embodiment, the protrusion lengths le of the louvers 61, 62, 63, 64,... Are made equal, and the inclination angle of the downstream louver in the air flow direction F is larger than the inclination angle of the upstream louver. Thus, the method of making the height of the downstream louver higher than that of the upstream louver has been described. However, apart from this, as shown in FIGS. 8 and 9, the louvers 161, 162, 163, 164,... By making the height (for example, le3, le4) larger than the upstream side louver (for example, le1, le2), the height of the downstream louver (for example, h13, h14) is set to the height of the upstream louver (for example, h11). , H12).

  As an example, the inclination angle θ10 of each louver 161, 162, 163, 164,... Is about 30 degrees, and the heights h1, h2, h3, h4 of each louver 161, 162, 163, 164,. .. In order of “about 0.139 mm”, “about 0.274 mm”, “about 0.400 mm”, and “about 0.514 mm”, the protruding lengths of the louvers 161, 162, 163, 164,. Le1, le2, le3, and le4 may be set to “about 0.278 mm”, “about 0.548 mm”, “about 0.800 mm”, and “about 1.028 mm” in this order.

  Thus, the height of the downstream louver can be easily increased by increasing the protruding lengths le1, le2, le3, le4,... Of each louver from the upstream side to the downstream side in the air flow direction F. Can be made higher than the upstream louver.

  In this case, the distance D between the louvers 161, 162, 163, 164,... May be the same or different.

(5-2) Modification B
Further, the louvers 61, 62, 63, 64,... Described in the above embodiment have different inclination angles, and the louvers 161, 162, 163, 164,. The height of the downstream louver may be made higher than that of the upstream louver by combining with a method in which the projecting lengths 1, le2, le3, le4,. FIG. 10 shows an arrangement structure of the louvers 261, 262, 263, 264,. That is, in FIG. 10, the inclination angle (for example, the inclination angles θ23 and θ24 of the louvers 263 and 264) of the downstream louver with respect to the plate portion 60 of the upstream louver (for example, the louver 261, 262, the length of the downstream louver projecting from the plate-like portion 60 (for example, the projecting lengths le13 and le14 of the louvers 263 and 264), while the upstream louver is the plate. It is made longer than the length which protrudes from the shape part 60 (For example, protrusion length le11, le12 of the louvers 261,262).

  As a result, the number of parameters that can be adjusted to increase the height of the downstream louver (for example, the heights h23 and h24 of the louvers 263 and 264) increases, and the degree of freedom in implementation increases.

(5-3) Modification C
In the said embodiment and the said modification A and B, as shown to FIG.5,8,10, it demonstrated the case where the height of a louver became high gradually as it went to the downstream from the upstream of the air flow direction F. . However, the height of each louver may increase every predetermined number of louvers from the upstream side in the air flow direction F toward the downstream side.

  FIG. 11 shows an example in which the heights h31, h32, h33,... Of the louvers 361, 362, 363, 364, 365, 366,. . In FIG. 11, the louver 361 and the louver 362 adjacent to the louver 361 have the same height (h 31), and the two louvers 363 and 364 located side by side in the air flow direction F with respect to the louver 362 are louvers 361 and 362. (H32). The two louvers 365 and 366 located side by side in the air flow direction F with respect to the louver 364 are higher than the louvers 361, 362, 363, and 364 (h33).

  11, the louvers 361, 362, 363, 364, 365, 366,... Have the same projecting length, but the louvers 361, 362, 363, 364, 365, 366 have the same length. ..,... Are different from each other in the height of the upstream louver and the downstream louver. However, the specific method for increasing the height of the louver for each predetermined number of louvers is not limited to the method of FIG. 11 associated with the inclination angle, but only the protruding length of each louver as in Modification A. It may be a method of changing, or a method of changing the inclination angle and changing the protruding length as in Modification B.

  According to the heat exchanger having such a louver structure, air easily reaches each louver having a higher height.

(5-4) Modification D
The louver according to the present invention may be formed on one surface of the plate-like portion 60 or may be formed on a part of the plate-like portion 60. For example, since the upstream portion in the air flow direction F of the fins 50 is likely to be frosted, about 10 to 20 louvers from the vicinity of the upstream end portion in the air flow direction F in the plate-like portion 60 are described above. A louver may be employed.

(5-5) Modification E
The number of louvers according to the present invention may be the same or different for each plate-like portion 60 in the corrugated fin 50.

(5-6) Modification F
In the above embodiment, the fins 50 located between the flat heat transfer tubes 41, 42, 43,... Have been described as the first fins 51 and the second fins 52. However, the fin according to the present invention does not necessarily have to be positioned between the flat heat transfer tubes, and the louver according to the present invention described above is also formed in the fins in contact with any one of the flat heat transfer tubes. Can do.

(5-7) Modification G
In the said embodiment, the case where the heat exchanger 10 was applied to the outdoor unit of an air conditioning apparatus was demonstrated. However, the heat exchanger 10 can also be applied as a heat exchanger in an outdoor unit of a refrigeration apparatus other than an air conditioner, such as a heat source unit of a hot water supply apparatus.

  Further, the heat exchanger 10 according to the present embodiment does not function as a refrigerant evaporator or a radiator, and may be one that can be used as at least a refrigerant evaporator.

(5-8) Modification H
In the above embodiment, the case where the heat exchanger 10 is a so-called stacked microchannel heat exchanger has been described. However, if the configuration in which the height from the plate-like portion to the distal end in the protruding direction at the downstream-side protruding portion is larger than that of the upstream-side protruding portion, what kind of heat exchanger is used? May be. Other types of heat exchangers include heat exchangers that insert flat heat transfer tubes into insertion tubes provided on plate-shaped fins, and heat exchangers that insert heat transfer tubes having a circular cross section into fins. And a heat exchanger in which a plurality of fins are located in a part of the flat heat transfer tube.

  According to the heat exchanger according to the present invention, even if frost adheres to the louver or the like located on the upstream side, air reaches the louver located on the downstream side, so that the heat exchange efficiency of the heat exchanger is improved. Decline can be prevented. The heat exchanger according to the present invention can be mounted on a heat source unit of a refrigeration apparatus such as an air conditioner or a hot-water supply unit that is easily frosted at low outside air by being installed outdoors.

DESCRIPTION OF SYMBOLS 10 Heat exchanger 20 Split flow header 30 Merge header 40 Flat heat-transfer tube group 41, 42, 43 Flat heat-transfer tube 41a, 41b, 42a, 42b, 43a, 43b Flat surface 50, 150 Fin 51, 151 1st fin 52, 152 1st Two fins 60, 160 Plate-like portions 61, 62, 63, 64, ... Louvers 61a, 61b, 62a, 62b, 63a, 63b, ... Louver parts θ1, θ2, θ3, θ4, ... Angle ti1, ti2, ti3, ti4,... Louver sticking direction tip fr0, fr1, fr2, fr3, fr4 Frost adhering to louver

JP 2010-2138 A JP 2005-201492 A

Claims (7)

An air-cooled and ventilated heat exchanger,
A plate-like portion (60) arranged so that the plate thickness direction intersects the air flow direction (F) generated by the ventilation, and protrudes from the plate-like portion in the plate thickness direction and along the air flow direction. A fin (50) having a plurality of protrusions (61, ..., 161, ..., 261 ..., 361, ...) arranged;
A plurality of heat transfer tubes (41, 42, 43,...) Inserted into the fins so as to intersect the air flow direction;
With
The plurality of protrusions have an upstream protrusion located on the upstream side in the air flow direction, and a downstream protrusion located on the downstream side in the air flow direction,
The height from the plate-like portion to the protruding direction tip portion in the downstream protruding portion is larger than the height from the plate-like portion to the protruding direction tip portion in the upstream protruding portion,
Heat exchanger (10). The length of the downstream protruding portion protruding from the plate-like portion is larger than the length of the upstream protruding portion protruding from the plate-like portion,
The heat exchanger (10) according to claim 1. The inclination angle of the downstream protrusion with respect to the plate-like portion is larger than the inclination angle of the upstream protrusion with respect to the plate-like portion,
The heat exchanger (10) according to claim 1 or 2. The height from the plate-like portion to the tip end portion in the protruding direction in each protruding portion gradually increases from the upstream side to the downstream side in the air flow direction.
The heat exchanger (10) according to any one of claims 1 to 3. The height from the plate-like portion to the tip end in the protrusion direction of each protrusion is higher for each predetermined number of the protrusions from the upstream side to the downstream side in the air flow direction.
The heat exchanger (10) according to any one of claims 1 to 3. Each protrusion is formed by cutting and raising from a part of the plate-like part.
The heat exchanger (10) according to any one of claims 1 to 5. The heat exchanger is used in a refrigeration apparatus capable of performing a defrosting operation to remove frost formed on the heat exchanger.
The heat exchanger (10) according to any one of claims 1 to 6.

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