JPWO2018020552A1 - Heat exchanger and air conditioner - Google Patents

Abstract

  A heat exchanger excellent in heat transfer performance and drainage and an air conditioner to which the heat exchanger is applied can be obtained. The heat exchanger comprises at least one heat transfer tube (1) and at least one fin (3). The heat transfer tube (1) is provided so as to extend along the first direction, and the refrigerant circulates therein. The fin (3) is located on the windward side from the center of the heat transfer tube (1) in the second direction intersecting the first direction, and is connected to the heat transfer tube (1).

Description

  The present invention relates to a heat exchanger and an air conditioner.

  Conventionally, a heat exchanger using a flat tube as a heat transfer tube is known (see, for example, JP-A-9-280754: Patent Document 1). In the heat exchanger disclosed in Patent Document 1, a plurality of flat tubes are arranged in parallel as heat transfer tubes, and corrugated fins are arranged between adjacent flat tubes. A reinforcing rib is formed on the windward side of the corrugated fin. A louver is formed on the leeward side of the corrugated fin. The corrugated fin has a portion extending to the windward side from the heat transfer tube. Such a heat exchanger is applied to an air conditioner, for example. In Patent Document 1, by adopting the above-described configuration, meandering during molding of the corrugated fin can be prevented, and a sufficient frost formation region can be ensured when the corrugated fin is caused to function.

JP-A-9-280754

  The conventional heat exchanger as described above is excellent in terms of heat transfer performance because the corrugated fin has a sufficiently large surface area. However, the conventional heat exchanger described above has room for improvement with respect to the drainage property of removing water droplets from the surface of the corrugated fin during the defrosting operation.

  The present invention was made to solve the above-described problems, and an object of the present invention is to provide a heat exchanger excellent in heat transfer performance and drainage and an air conditioner to which the heat exchanger is applied. It is to be.

  The heat exchanger according to the present invention includes at least one heat transfer tube and at least one fin. The heat transfer tube is provided so as to extend along the first direction, and the refrigerant circulates therein. The fin is located on the windward side from the center of the heat transfer tube in the second direction intersecting the first direction, and is connected to the heat transfer tube.

  According to this invention, since the fin is formed on the windward side from the center of the heat transfer tube, the heat transfer characteristics of the heat exchanger can be improved. Furthermore, when the water droplets adhering to the surface of the fin move to the leeward side due to the air flow, the water droplet flows on the surface of the heat transfer tube located on the leeward side of the fin and easily passes through the surface of the heat transfer tube. Discharged. That is, the drainage of the heat exchanger can be improved.

It is an external appearance schematic diagram of the heat exchanger which concerns on this embodiment. It is a partial external appearance schematic diagram of the heat exchanger which concerns on this embodiment. It is a partial side surface schematic diagram of the heat exchanger which concerns on this embodiment. FIG. 4 is a partial cross-sectional schematic view taken along line IV-IV in FIG. 3. It is a partial cross section schematic diagram of the modification of the heat exchanger which concerns on this embodiment. It is a schematic diagram for demonstrating the manufacturing method of the heat exchanger which concerns on this embodiment. It is a schematic diagram which shows the refrigerant circuit of the air conditioning apparatus using the heat exchanger which concerns on this embodiment. It is a partial external appearance schematic diagram of the heat exchanger of a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated. Moreover, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one. Furthermore, the forms of the constituent elements shown in the entire specification are merely examples, and are not limited to these descriptions.

Embodiment 1 FIG.
<Configuration of heat exchanger>
1 and 2 show the appearance of the heat exchanger according to the present embodiment. FIG. 3 is a partial side schematic view of the heat exchanger shown in FIGS. 1 and 2 as viewed from the side. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.

  The heat exchanger according to the present embodiment shown in FIGS. 1 to 4 includes at least one heat transfer tube 1 that is a flat tube, at least one fin 3 formed on the surface of the heat transfer tube 1, and the direction of gravity. And the header 2 connected to the upper end and the lower end of the heat transfer tubes 1 arranged respectively. The heat transfer tube 1 is provided so as to extend along a first direction which is a direction along the direction of gravity. A refrigerant circulates inside the heat transfer tube 1. Inside the heat transfer tube 1 having a flat tubular shape, a number of refrigerant flow paths may be formed along the extending direction (first direction).

  In the heat exchanger shown in FIG. 1, the plurality of heat transfer tubes 1 are arranged so as to be substantially parallel to each other. The upper ends of the plurality of heat transfer tubes 1 are respectively connected to the upper header 2. The lower ends of the plurality of heat transfer tubes 1 are also connected to the lower header 2. As shown by the arrow in FIG. 1, the lower header 2 is supplied with refrigerant from, for example, the end thereof. The refrigerant flowing from the inside of the header 2 into the heat transfer tube 1 rises inside the heat transfer tube 1 and flows into the upper header 2. The refrigerant that has reached the upper header 2 is discharged from the header 2 to the outside of the header 2 as indicated by an arrow, for example.

  The fins 3 that are cut and raised are formed on the side surfaces of the heat transfer tubes 1 where the adjacent heat transfer tubes 1 face each other. The side surface portion is a flat surface portion having the largest area among the side surfaces of the heat transfer tube 1. The plurality of fins 3 are arranged at intervals from each other along the extending direction of the heat transfer tube 1. The fin 3 connected to the heat transfer tube 1 is a central axis that is the center of the heat transfer tube 1 in a second direction (a direction perpendicular to the first direction and going from the windward to the leeward direction) that intersects the first direction of the heat transfer tube 1. 4 (see FIG. 2) is located on the windward side. The fins 3 are not formed on the leeward side from the central axis 4. In the heat exchanger shown in FIG. 1, two units in which a plurality of heat transfer tubes 1 are arranged so as to connect between the pair of headers 2 as described above are arranged from the upwind direction to the downwind direction. Is arranged. In the unit, the heat transfer tube 1 is arranged so that the surface of the side surface portion on which the fins 3 are formed in the heat transfer tube 1 is along the direction from the windward to the leeward.

  As shown in FIG. 3, the fin 3 that is a plate-like body has a surface inclined from the horizontal direction to the gravity direction downward from the windward side to the leeward side. The inclination angle θ of the fin 3 with respect to the horizontal direction may be, for example, greater than 0 ° and not greater than 30 °. The lower limit of the inclination angle θ may be 5 ° or 10 °. The upper limit of the inclination angle θ may be 20 ° or 15 °.

  As shown in FIG. 4, the at least one fin 3 includes a first fin 3 and a second fin 3 that are disposed so as to sandwich the heat transfer tube 1 when viewed from the windward side. The planar shape of at least one fin 3 viewed from the extending direction (first direction) of the heat transfer tube 1 is a quadrangular shape. The width of the fin 3, which is the protruding height of the fin 3 from the surface of the heat transfer tube 1, may be, for example, half or less of the distance between adjacent heat transfer tubes 1. In this case, the positions of the fins 3 in the first direction in the adjacent heat transfer tubes 1 may be the same. Moreover, the width | variety of the fin 3 is larger than the half of the distance between the adjacent heat exchanger tubes 1, for example, and may be less than the said distance. In this case, the fins 3 are arranged so that the positions of the fins 3 in the first direction in the adjacent heat transfer tubes 1 are different. Further, the length of the connecting portion between the fin 3 and the heat transfer tube 1 may be, for example, 30% to 40% of the length of the heat transfer tube 1 in the direction from the windward to the leeward. The thickness of the fin 3 may be 0.1 mm or more and 0.5 mm or less, or 0.2 mm or more and 0.4 mm or less.

  As shown in FIG. 4, the heat transfer tube 1 includes a heat transfer tube main body 8, a bonding material 7, and an outer shell member 5. The outer shell member 5 surrounds the outer periphery of the heat transfer tube main body 8. At least one fin 3 is formed on the surface of the outer shell member 5. The material constituting the outer shell member 5 may be aluminum or an alloy containing aluminum and zinc. The material constituting the fin 3 may be the same as the material constituting the outer shell member 5. Alternatively, the material constituting the fin 3 may be a material different from the material constituting the outer shell member 5. The bonding material 7 is located between the heat transfer tube main body 8 and the outer shell member 5. The bonding material 7 connects the heat transfer tube main body 8 and the outer shell member 5. The bonding material 7 is, for example, a brazing material containing silicon.

  Moreover, the width | variety (length of a short axis) seen from the upwind direction of the heat exchanger tube 1 may be 0.5 mm or more and 2 mm or less, for example, and may be 1 mm. Moreover, the pitch (distance between centers) between the adjacent heat transfer tubes 1 may be 2.5 mm or more and 3.5 mm or less, for example, 3 mm.

<Effects of heat exchanger>
Thus, by providing the fin 3 as a cut and raised at the front edge portion of the heat transfer tube 1 which is a flat tube, the heat transfer area in the heat exchanger can be expanded, and the fin 3 can be extended vertically on the leeward side. A vortex is generated, and the heat transfer coefficient in the heat exchanger is improved. Moreover, if it says from a different viewpoint, compared with the case where the said fin 3 is not formed by formation of the fin 3, the heat-transfer characteristic of a heat exchanger can be improved. Furthermore, as shown in FIG. 3, the case where the heat exchanger of this embodiment is used as an evaporator is considered. In this case, the water droplets 6 that are condensed water first stay on the fins 3. As shown in FIG. 3, the fin 3 is inclined downward in the gravity direction toward the leeward side with respect to the horizontal direction. For this reason, the water droplet 6 moves to the leeward side by the action of the inclination and further by the force from the air flow. Thus, when the water droplet 6 adhering to the surface of the fin 3 moves to the leeward side of the air flow supplied to the heat exchanger, the water droplet 6 is the surface of the heat transfer tube 1 located on the leeward side of the fin 3. Flows up. Thereafter, the water droplet 6 flows along the surface of the heat transfer tube 1 downward in the direction of gravity and is easily discharged from the heat exchanger. That is, the surface of the heat transfer tube 1 includes a portion located leeward of the fin 3. This part functions as a drainage channel for water droplets. For this reason, compared with the structure where the width | variety of a fin is wider than the width | variety of the heat exchanger tube shown in FIG. 8, the drainage property of a heat exchanger can be improved.

  Here, FIG. 8 is a partial external schematic view showing a configuration of a heat exchanger as a comparative example. The heat exchanger of the comparative example shown in FIG. 8 includes a heat transfer tube 110 that is a flat tube including a plurality of refrigerant channels 113 and corrugated fins 114 as fins disposed between the plurality of heat transfer tubes 110. . A draining groove 112 is formed on the surface of the heat transfer tube 110. In the direction along the surface portion to which the corrugated fins 114 of the heat transfer tubes 110 are connected, the width of the corrugated fins 114 is wider than the width of the heat transfer tubes 110. A plurality of louvers 114 a and ribs 114 b are formed on the surface of the corrugated fins 114. In the heat exchanger shown in FIG. 8, since the width of the corrugated fin 114 is wider than the width of the heat transfer tube 110, although it is excellent in terms of heat transfer performance, the drainage property of water droplets aggregated on the corrugated fin 114 is There is a stand. In particular, in the portion extending outside the end portion of the heat transfer tube 110 in the corrugated fin 114, there is no specific substantive path for discharging water droplets from the surface of the corrugated fin 114, and drainage performance is improved. There was a problem. Unlike such a heat exchanger, in the heat exchanger according to the present embodiment, the surface of the heat transfer tube 1 located on the leeward side of the fin 3 functions as a flow path for the water droplets 6 as described above. Therefore, in the heat exchanger according to the present embodiment, excellent drainage can be realized.

  Moreover, since the fin 3 inclines below the gravitational direction toward the leeward side with respect to the horizontal direction as described above, the drainage performance is improved. For this reason, the increase in ventilation resistance resulting from the water droplet 6 staying on the fin 3 can be suppressed.

  Further, as shown in FIG. 4, since the fin 3 includes the first fin 3 and the second fin 3 arranged on both sides of the heat transfer tube 1, the fin 3 is formed only on one side of the heat transfer tube 1. Further, the heat transfer characteristics of the heat exchanger can be improved. Moreover, the corrosion resistance of a heat exchanger can be improved by using the alloy which contains aluminum and zinc as a material which comprises the outer shell member 5. FIG.

<Configuration and effect of modification of heat exchanger>
FIG. 5 is a partial cross-sectional schematic diagram showing a modification of the heat exchanger according to the present embodiment. The heat exchanger shown in FIG. 5 basically has the same configuration as the heat exchanger shown in FIGS. 1 to 4, but the planar shape of the fin 3 is the heat exchanger shown in FIGS. 1 to 4. Is different. That is, in the heat exchanger shown in FIG. 5, the planar shape of at least one fin 3 is triangular when viewed from the first direction, which is the direction in which the heat transfer tube 1 extends.

  By adopting such a configuration, the same effect as that of the heat exchanger shown in FIGS. 1 to 4 can be obtained, and the planar shape of the fin 3 is triangular, so that the airflow generated near the surface of the fin 3 , And the vertical vortex formed by the airflow (wake) generated on the leeward side of the fin 3 increases. For this reason, a higher heat transfer coefficient is obtained in the heat exchanger.

<Manufacturing method of heat exchanger>
FIG. 6 is a schematic diagram for explaining the manufacturing method of the heat exchanger according to the present embodiment, and shows a state before the heat exchanger is assembled. The manufacturing method of the heat exchanger which concerns on this embodiment is demonstrated using FIG.

  First, the members (the heat transfer tube main body 8, which is a flat tube, the outer shell member 5 on which the fins 3 are formed, and the bonding material 7) constituting the heat transfer tube 1 of the heat exchanger are prepared. As the bonding material 7, a brazing material containing silicon can be used. The bonding material 7 is disposed on the inner peripheral surface of the outer shell member 5 (the back surface opposite to the surface on which the fins 3 are formed). Thereafter, the heat transfer tube main body 8 is sandwiched between the two outer shell members 5 in which the bonding material 7 is disposed on the inner peripheral surface from both side surfaces of the heat transfer tube main body 8. In this state, the heat transfer tube main body 8 and the outer shell member 5 are joined (for example, brazed) by the joining material 7 by heat treatment in a heating furnace.

  In this way, the heat transfer tube 1 having a plurality of fins 3 arranged on the side surface is prepared. Furthermore, other members constituting the heat exchanger (such as the header 2 shown in FIG. 1) are prepared, and these other members and the heat transfer tube 1 are joined. In this way, the heat exchanger shown in FIG. 1 can be manufactured.

  By using such a manufacturing process, a heat exchanger can be manufactured in a relatively short time and at a low cost. Moreover, since the heat transfer tube 1 is formed by attaching the outer shell member 5 in which the fins 3 are provided in advance to the outer peripheral surface of the heat transfer tube main body 8, a plurality of fins 3 are formed directly on the heat transfer tube main body 8. Further, the manufacturing process can be facilitated.

Embodiment 2. FIG.
<Configuration of air conditioner>
FIG. 7 is a schematic diagram showing a refrigerant circuit of the air-conditioning apparatus according to the present embodiment. The refrigerant circuit shown in the figure includes a compressor 33, a condensation heat exchanger 34, an expansion device 35, an evaporating heat exchanger 36, and two blowers 37. The two blowers 37 are each driven by a blower motor 38. The two blowers 37 blow gas (for example, air) to either the condensation heat exchanger 34 or the evaporative heat exchanger 36, respectively. In the refrigerant circuit, the refrigerant circulates in the order of the compressor 33, the condensing heat exchanger 34, the expansion device 35, and the evaporating heat exchanger 36.

  The heat exchanger described in the first embodiment is applied to at least one of the condensation heat exchanger 34 and the evaporation heat exchanger 36 shown in FIG. The blower 37 blows expectations to each heat exchanger along the second direction (the direction indicated by the arrow in FIG. 2).

<Operation effect of air conditioner>
By using the heat exchanger according to the first embodiment described above for the condensation heat exchanger 34 or the evaporative heat exchanger 36, or both the condensing heat exchanger 34 and the evaporative heat exchanger 36, air conditioning with high energy efficiency is achieved. The device can be realized. From a different point of view, the heat exchanger according to Embodiment 1 may be applied to an indoor unit or an outdoor unit of an air conditioner, or both an indoor unit and an outdoor unit.

In addition, energy efficiency is comprised by following Formula here, for example.
Heating energy efficiency = capacity of indoor heat exchanger (condensation heat exchanger) / total input Cooling energy efficiency = capacity of indoor heat exchanger (evaporation heat exchanger) / total input Further, heat exchange according to the first embodiment described above In the air conditioner using the heat exchanger and the heat exchanger, refrigerants such as R410A, R32, HFO1234yf can be used. In the above-described embodiment, an example in which air and a refrigerant are used as the working fluid has been shown. However, the same effect can be obtained even when other gas, liquid, or gas-liquid mixed fluid is used.

  Moreover, about the heat exchanger which concerns on Embodiment 1 mentioned above, and an air conditioning apparatus using the same, as oil for refrigerators, a mineral oil type, an alkylbenzene oil type, an ester oil type, an ether oil type, a fluorine oil type, etc., Any type of oil can be used. In addition, as to the refrigerator oil, any refrigerator oil may be used regardless of whether the refrigerant dissolves in the oil or not.

  Although the embodiment of the present invention has been described above, the above-described embodiment can be variously modified. The scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied to an air conditioner, a refrigeration cycle apparatus, a heat pump apparatus, and the like.

1,110 Heat transfer tubes, 2 headers, 3 fins, 4 central shafts, 5 outer shell members, 6 water droplets, 7 joining materials, 8 heat transfer tube bodies, 9 JP, 33, compressors, 34 condensation heat exchangers, 35 throttle devices 36 Evaporative heat exchanger, 37 Blower, 38 Blower motor, 112 groove, 113 refrigerant flow path, 114 corrugated fin, 114a louver, 114b rib.

Claims (9)

At least one heat transfer tube provided so as to extend along the first direction and in which a refrigerant flows;
A heat exchanger comprising: at least one fin located on the windward side from the center of the heat transfer tube in a second direction intersecting the first direction and connected to the heat transfer tube.   2. The heat exchanger according to claim 1, wherein the at least one fin has a surface inclined from the horizontal direction to the gravity direction downward from the windward side toward the leeward side.   The heat exchange according to claim 1 or 2, wherein the at least one fin includes a first fin and a second fin that are disposed so as to sandwich the heat transfer tube when viewed from the windward side. vessel.   The heat exchanger according to any one of claims 1 to 3, wherein a planar shape of the at least one fin viewed from the first direction is a quadrangular shape.   The heat exchanger according to any one of claims 1 to 3, wherein a planar shape of the at least one fin viewed from the first direction is a triangular shape. The heat transfer tube is
A heat transfer tube body;
An outer shell member surrounding the outer periphery of the heat transfer tube body,
The heat exchanger according to any one of claims 1 to 5, wherein the at least one fin is formed on a surface of the outer shell member.   The heat exchanger according to claim 6, wherein the material constituting the outer shell member includes aluminum and zinc. The heat transfer tube is located between the heat transfer tube main body and the outer shell member, and includes a bonding material that connects the heat transfer tube main body and the outer shell member,
The heat exchanger according to claim 6 or 7, wherein the bonding material is a brazing material containing silicon. The heat exchanger according to any one of claims 1 to 8,
An air conditioner comprising: a fan that blows gas to the heat exchanger along the second direction.

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