JP2015222146A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maximize a heat exchange area and to secure draining performance of dew condensation water in an indoor heat exchanger of an air conditioner.SOLUTION: A heat exchanger 2A exchanging heat between a refrigerant in a flat tube 3 including a plurality of fine tubes, and the ambient air, includes a first flat tube 31 and a second flat tube 32 for vertically circulating the refrigerant. A back-side heat exchange portion 17 can be disposed at a back side of an indoor unit 1 by disposing the first flat tube 31 and the second flat tube 32 in an intersecting manner, thus a heat exchange area can be secured in maximum. Further dew condensation water generating in an upper header 6A and dropping can be trapped by the first flat tube 31 or the second flat tube 32 positioned at a vertical lower part of the upper header 6A.

Description

  The present invention relates to a parallel flow type heat exchanger disposed in an indoor unit of an air conditioner.

  Conventionally, a parallel flow heat exchanger in which flat tubes having a plurality of fine tubes are arranged in parallel, headers are provided at both ends thereof, and heat is exchanged between the refrigerant flowing in the flat tubes and the air outside the flat tubes is often used. Known (for example, Patent Document 1).

  In FIG. 10, the example which installed the parallel flow heat exchanger 92 in the indoor unit 91 of the air conditioner shown by patent document 1 is shown.

  In FIG. 10, a lower header (liquid side header) 4 is provided at the lower portion and an upper header (gas side header) 5 is provided at the upper portion, and the refrigerant flows from one of the lower header 4 and the upper header 5 to the other. Thus, the refrigerant flows in the vertical direction.

  When this heat exchanger 92 is used as an evaporator (when the indoor unit 91 is used in the cooling mode), the components of the heat exchanger 92 are lower than the ambient air under conditions where the air humidity on the cooled side is high. Due to the temperature, condensed water may be generated on the surface.

  Condensed water acts on condensed water (the force that condensates bridge between flat tubes or narrow spaces between fins, that is, the force that is captured) and the condensed water on the flat tube Gravity and the force given to the dew condensation water by the air flow flowing into the indoor unit 91 act. Depending on the balance of these forces, the condensed water flows down the flat tube to the lower part of the heat exchanger, or drops from the heat exchanger 92 and scatters to the air blowing path 7.

  Therefore, in FIG. 10, the drain pan 8 is disposed below the heat exchanger 92 so that the dew condensation water dripping from the heat exchanger 92 is received so that the dew condensation water is not discharged into the cooling target space (room). And discharge it to the outside.

JP 2008-256305 A

  In the configuration of Patent Document 1, the heat exchanger 92 is disposed only on the front side of the indoor unit 91. In order to ensure the predetermined heat exchange performance of the air conditioner, the heat exchange area is increased in the side surface direction. There is a need to increase the size of the indoor unit 91 in the side surface direction (width).

  In addition, in the upper header 5, due to the configuration, a part of the header forms a vertically downward surface, and there is no narrow portion where condensed water bridges near the lower portion of the upper header 5. The force applied to the dew condensation water by the air flow described above overcomes the cohesive force of the dew condensation water, and the dew condensation water may scatter to the air blowing path 7 and be discharged to the cooling target space (room).

  In order to solve this fear, in Patent Document 1, the drain pan 8 is arranged so as to cover the entire projection surface (horizontal projection surface) in the vertical lower direction of the upper header 5. There is a concern that the drain area of the drain pan 8 with respect to the air passage 7 becomes excessive, and the air blowing performance is deteriorated.

  The present invention proposes an effective configuration that guarantees both improvement in heat exchange performance and drainage performance in a parallel flow heat exchanger.

  In order to solve the conventional problem, a heat exchanger of the present invention includes a first upper header provided in a horizontal direction, a first lower header provided in parallel to the first upper header, A plurality of first flat tubes provided between the first upper header and the first lower header, a first fin provided between the first flat tubes, and the first A second upper header provided in parallel with the upper header, a second lower header provided at a position away from the first lower header, the second upper header, and the second lower header. A plurality of second flat tubes provided between the second flat tubes and a second fin provided between the second flat tubes, and the second projection is provided on a horizontal projection surface of the first upper header. The flat tube is arranged, and the first flat tube is arranged on the horizontal projection surface of the second upper header. That.

  As a result, since a flat tube is always arranged in the vertical lower part of the upper header, it becomes possible to trap the condensed water falling from the upper header with the flat tube and guide the flow down to the periphery of the lower header. Therefore, it is possible to avoid the release of the dew condensation water to the air passage and to improve the drainage of the dew condensation water.

  In addition, the drain pan provided below the heat exchanger can also be reduced in size, and the drain pan does not become an obstacle to the air passage of the indoor unit, and the air blowing performance can be improved.

  Furthermore, it becomes possible to arrange a heat exchanger on the back side of the indoor unit, and the maximum heat exchange area can be secured, so that the heat exchange capability can be secured even when the size of the indoor unit in the side direction is smaller. It becomes possible.

  The heat exchanger of the present invention can guarantee the drainage performance of condensed water.

Cross-sectional view of an indoor unit provided with a heat exchanger according to Embodiment 1 (A) principal part side view (b) principal part bottom view of the heat exchanger which concerns on Embodiment 1 Sectional drawing of the flat tube of the heat exchanger which concerns on Embodiment 1. FIG. (A) principal part side view (b) principal part bottom view of the upstream heat exchanger which concerns on Embodiment 1 Schematic configuration diagram of a refrigeration cycle circuit including the heat exchanger according to Embodiment 1 (A) principal part side view (b) principal part bottom view of the heat exchanger which concerns on the modification 1 of Embodiment 1. FIG. (A) principal part side view (b) principal part bottom view of the heat exchanger which concerns on the modification 2 of Embodiment 1. FIG. (A) principal part side view (b) principal part bottom view of the heat exchanger which concerns on Embodiment 2. FIG. (A) principal part side view of the heat exchanger which concerns on the modification of Embodiment 2 (b) principal part bottom view Cross-sectional view of an indoor unit equipped with a conventional heat exchanger

The first invention includes a first upper header provided in a horizontal direction, a first lower header provided in parallel to the first upper header, the first upper header, and the first lower header. A plurality of first flat tubes provided between the header, a first fin provided between the first flat tubes, and a second fin provided in parallel with the first upper header. An upper header; a second lower header provided at a position away from the first lower header; and a plurality of second headers provided between the second upper header and the second lower header. A flat tube and a second fin provided between the second flat tubes, the second flat tube arranged on a horizontal projection surface of the first upper header, and the second upper portion The first flat tube is arranged on the horizontal projection surface of the header.

  According to this, even when the dew condensation water generated in the first upper header or the second upper header is scattered, the first header is disposed on the lower side in the gravity direction or on the downstream side in the air flow direction. The narrow portion formed by the flat tube, the second flat tube, or the like can trap the liquid droplet and then flow down to the first lower header or the second lower header without being scattered. it can. For this reason, it becomes possible to avoid discharging dew condensation water to the ventilation path and the space (room) where the heat exchanger is installed.

  As a secondary matter, it is possible to improve the blowing performance by downsizing the drain pan provided below the heat exchanger.

  Furthermore, the heat exchange area can be increased in a limited space, and the heat exchange capability can be improved.

  In a second aspect based on the first aspect, the second flat tube is disposed between the first flat tubes in the vicinity of the first upper header or the second upper header. It is a thing. According to this, a narrow portion formed between the first flat tube and the second flat tube is formed on the lower side or the downstream side of the first upper header or the second upper header. It is possible to trap the condensed water droplets generated in the first upper header or the second upper header, and then drop the droplets into the space (room) where the air passage and the heat exchanger are installed. It is possible to flow down to the first lower header or the second lower header without scattering.

  According to a third invention, in the first or second invention, the first flat tube and the second flat tube are in contact with each other in the vicinity of the first upper header or the second upper header. Is. According to this, a narrow part can be reliably formed on the lower side or the downstream side of the first upper header or the second upper header. Furthermore, when it arrange | positions so that each flat part of a 1st flat tube and a 2nd flat tube may touch, the 2nd flat tube 32 is located in the center of the adjacent 1st flat tubes 31. Alternatively, since the first flat tubes 31 are not positioned in the center between the adjacent second flat tubes 32, the ventilation resistance of the air passing between the first flat tubes 31 and the second flat tubes 32. Can be reduced.

  In a fourth aspect of the present invention, in any one of the first to third aspects, the first upper header and the second upper header are arranged so that a cross-sectional shape is a convex shape upward. Accordingly, the dew condensation water generated on the top surface portion of the upper header can easily flow down to the lower portion due to its own weight, and the drainage of the top surface portion of the upper header can be improved.

  According to a fifth invention, in any one of the first to fourth inventions, the first upper header and the second upper header are separated from each other by an interval between the first lower header and the second lower header. The air is disposed between the first upper header and the second upper header by disposing the first upper header and the second upper header by connecting pipes at positions spaced apart at a shorter interval. Therefore, the heat exchange performance between the sucked air at that portion and the refrigerant in the flat tube is improved, and further efficiency improvement can be realized.

  In a sixth aspect of the invention according to any one of the first to fifth aspects, the number of parts can be reduced by integrally forming the first upper header and the second upper header. realizable.

  7th invention arrange | positions another heat exchanger in the vertical direction upper part of the heat exchanger of any one of 1st-6th invention, and also ensures a heat exchange area, and is highly efficient. Condensation water scattered from another heat exchanger can be trapped by the heat exchanger of any one of the first to sixth inventions, and the drainage of the dew condensation water can be secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
As an application example of the heat exchanger according to the first embodiment of the present invention, an indoor unit of an air conditioner used in a general home will be described. FIG. 1 is a cross-sectional view of an indoor unit including the heat exchanger according to Embodiment 1 of the present invention. In the following description, in the indoor unit, the side attached to the wall of the room will be described as the back surface, and the side facing the back surface will be described as the front surface.

  The indoor unit 1 includes a casing 11 that forms an outer shell, in which a heat exchanger 2A that is a heat exchanger according to the first embodiment of the present invention and an upstream heat provided above the heat exchanger 2A are provided. And an exchanger 14. A suction port 12 is provided at the front surface and the top surface of the casing 11, and an air outlet 13 is provided at a corner formed by the front surface and the bottom surface. In the casing 11, an air passage 7 is formed from the inlet 12 to the outlet 13.

  Moreover, the indoor unit 1 is provided with the crossflow fan 9 for exchanging heat with the upstream heat exchanger 14 and the heat exchanger 2A, and blowing out the air taken in from the suction inlet 12 indoors. The cross flow fan 9 is disposed at the lower part of the heat exchanger 2 </ b> A in the air passage 7 so that the rotation axis is parallel to the width direction of the indoor unit 1.

  The filter 10 is provided between the suction port 12 and the upstream heat exchanger 14. Further, the casing 11 is provided with a drain pan 8 for receiving condensed water from the upstream heat exchanger 14 and the heat exchanger 2A.

  When the air conditioner starts operation, the cross-flow fan 9 rotates, and the upstream side of the cross-flow fan 9 in the air flow path 7 becomes a low pressure due to the air scooping action by the swirling motion of the cross-flow fan 9. By the suction force generated by this, air flows into the indoor unit 1 from the suction port 12, and after dust is removed by the filter 10, the air passes through the upstream heat exchanger 14 and the heat exchanger 2A in this order. Then, the speed is increased by the cross-flow fan 9 and blown out from the blow-out opening 13 into the room (a space to be cooled / heated).

  When the air flow passes through the upstream heat exchanger 14 and the heat exchanger 2A, the air flow exchanges heat with the refrigerant in the flat tubes constituting the upstream heat exchanger 14 and the heat exchanger 2A, so that cold air or hot air It becomes.

  Here, the heat exchanger will be described in detail. The upstream heat exchanger 14 is a parallel flow heat exchanger, and is disposed so as to cover the upper side of the cross flow fan 9 when viewed from the side of the indoor unit 1.

The upstream heat exchanger 14 includes a front side heat exchange unit 26 located on the front side of the cross flow fan 9 and a back side heat exchange unit 27 located on the rear side of the cross flow fan 9. The front side heat exchange unit 26 is provided between the front side lower header provided in the horizontal direction, the upper header 5 provided in parallel with the front side lower header, and the front side lower header and the upper header 5. A plurality of flat tubes 3 and fins 15 provided between the plurality of flat tubes 3 are provided. The back side heat exchanging unit 27 includes a back side lower header provided in the horizontal direction, the above-described upper header 5, a plurality of flat tubes 3 provided between the back side lower header and the upper header 5, and a plurality of And fins 15 provided between the flat tubes.

  The heat exchanger 2 </ b> A is a parallel flow heat exchanger disposed on the downstream side of the upstream heat exchanger 14, and is disposed so as to cover the upper side of the cross flow fan 9 when viewed from the side of the indoor unit 1.

  The heat exchanger 2 </ b> A includes a front side heat exchange unit 16 located on the front side of the cross flow fan 9 and a back side heat exchange unit 17 located on the rear side of the cross flow fan 9. The front side heat exchange unit 16 includes an upper header 6A provided in the horizontal direction, a first lower header 41 provided in parallel to the upper header 6A, and the upper header 6A and the first lower header 41. A plurality of first flat tubes 31 provided and first fins 151 provided between the first flat tubes 31 are provided.

  The back-side heat exchange unit 17 includes a plurality of second lower headers 42 provided at positions away from the first lower header 41, and a plurality of second headers provided between the upper header 6A and the second lower header 42. 2 flat tubes 32 and second fins 152 provided between the second flat tubes 32.

  In other words, a first lower header 41 and a second lower header 42 which are a pair of lower headers are provided below the heat exchanger 2A, and the first flat pipe 31 is provided in the first lower header 41. Are connected in a row in the depth direction of FIG. 1, and the second flat tubes 32 are connected to the second lower header 42 in a row in the depth direction of FIG. The first flat tube 31 and the second flat tube 32 are installed so as to extend from the first lower header 41 and the second lower header 42 upward and in directions close to each other. After crossing each other, they are connected to an upper header 6A having an inverted V shape.

  The drain pan 8 is installed from the lower surface to the side surface of each of the first lower header 41 and the second lower header 42. When this indoor unit 1 is used in the cooling mode, the upstream heat exchanger 14 and the heat exchanger 2A act as an evaporator that absorbs heat from the ambient air, and therefore naturally have a lower temperature than the ambient air. At this time, if the contact surface temperature of the upstream heat exchanger 14 and the ambient air of the heat exchanger 2A is equal to or lower than the temperature of the saturated air condition of the ambient air, the surface of the upstream heat exchanger 14 and the heat exchanger 2A Condensation water is generated. The drain pan 8 collects the water thus generated and discharges it to the outside.

  2A is a side view of the main part and FIG. 2B is a bottom view of the main part showing an outline of the connection part between the upper header 6A and the flat tube 3 of the heat exchanger 2A according to the first embodiment of the present invention. is there.

  In FIG. 2, the 1st flat tube 31 and the 2nd flat tube 32 are installed so that the lower part (horizontal projection surface, A area | region in FIG. 2) of 6 A of upper headers may be covered. The first flat tubes 31 and the second flat tubes 32 are staggered with respect to each other, and are connected to the upper header 6A so that they do not interfere with each other. That is, in the lower part of the upper header 6A, the second flat tube 32 is arranged between the first flat tubes 31, and in a side view (when the heat exchanger 2A is viewed in the axial direction of the upper header 6A). Are configured to cross each other. In addition, the 1st fin 151 may be arrange | positioned between the 1st flat tubes 31 so that the lower part of 6 A of upper headers may be covered. Moreover, the 2nd fin 152 may be arrange | positioned between the 2nd flat tubes 32 so that the lower part of 6 A of upper headers may be covered.

The first fin 151 and the second fin 152 provided between the first flat tube 31 and the second flat tube 32 are corrugated straight fins each having a zigzag shape. In addition, the fin shape of the 1st fin 151 and the 2nd fin 152 is not limited to this shape, The direction of the corrugated louver fin provided with the louver is more preferable in terms of improving heat exchange performance. Also, plug-in straight fins may be installed.

  The upper header 6A includes a first upper header 6A1 to which the first flat tube 31 is connected, and a second upper header 6A2 to which the second flat tube 32 is connected. Each of the first upper header 6A1 and the second upper header 6A2 is a hollow tube having a substantially rectangular cross section, and the first flat tube 31 and the second flat tube 32 are provided on one side of the wider side, respectively. Has been inserted. The surface facing the surface where the first flat tube 31 of the first upper header 6A1 is inserted and the surface facing the surface where the second flat tube 32 of the second upper header 6A2 is inserted, respectively, Inclined with respect to the horizontal plane in different directions.

  The first upper header 6A1 and the second upper header 6A2 are in contact with each other on the upper surface side of the narrower surfaces and are integrally formed. For this reason, the upper header 6 </ b> A has an inverted V shape that is convex upward. The internal spaces of the first upper header 6A1 and the second upper header 6A2 communicate with each other.

  In addition to the connected first flat tube 31, a part of the second flat tube 32 is also arranged on the horizontal projection surface of the first upper header 6A1. In addition to the connected second flat tube 32, a part of the first flat tube 31 is also arranged on the horizontal projection surface of the second upper header 6A2.

  The first flat tube 31 and the second flat tube 32 will be described with reference to FIG. FIG. 3 is a cross-sectional view of the flat tube 3 of the heat exchanger 2A. Each of the first flat tube 31 and the second flat tube 32 is a flat tube 3, which is an elongated flat plate-like heat transfer tube provided with a fine tube 3 a serving as a refrigerant channel inside, and the outer surfaces thereof are opposed to each other. The two flat portions 3b and the two side portions 3c connecting the two flat portions 3b.

  The fine tube 3a formed inside the first flat tube 31 communicates with the internal space of the first lower header 41 and the internal space of the first upper header 6A1. Further, the fine tube 3a formed inside the second flat tube 32 communicates with the internal space of the second lower header 42 and the internal space of the second upper header 6A2.

  About the heat exchanger 2A comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As shown in FIGS. 1 and 2, the flat tube 3 of the heat exchanger 2 </ b> A extends forward and backward from the upper header 6 </ b> A, and includes a front side heat exchange unit 16 and a back side heat exchange unit 17. For this reason, compared with the conventional heat exchanger 92 shown in FIG. 10, it is possible to install a heat exchanging section on the back side of the indoor unit 1, and secure heat exchanging performance by expanding the heat exchanging area. Therefore, it is possible to improve the cooling / heating capacity without increasing the size of the indoor unit in the lateral direction.

  Moreover, as shown in FIG. 1, the upstream heat exchanger 14 is further installed in the upper part of the heat exchanger 2A to further increase the heat exchange area. In the present embodiment, the heat exchanger 2A has a structure in which the upstream heat exchanger 14 is stacked in two stages. However, as long as the size of the indoor unit 1 is acceptable, the number of stages may be increased. It doesn't matter.

In the heat exchanger 2A, since the first flat tube 31 and the second flat tube 32 are installed so as to cover the lower portion of the upper header 6A, even when the condensed water generated in the upper header 6A falls, Since many narrow parts are located in the lower part, it is easy to be trapped by the narrow part by the cohesive force of condensed water (the force that the condensed water bridges to the narrow part, that is, the force to be supplemented). The narrow portion described here is a space formed between the adjacent first flat tubes 31, a space formed between the adjacent second flat tubes 32, The space formed between the combined first flat tube 31 and the second flat tube (the space formed at the intersection 23 when viewed from the side surface), the first fin 151, and the second fin 152 A space formed between the zigzag shape, a space formed between the first fin 151 and the first flat tube 31, and a space formed between the second fin 152 and the second flat tube 32. Space.

  The water trapped in the narrow portion balances the cohesive force of condensed water, the force given by the air flow, and the gravity, and travels through the first flat tube 31 or the second flat tube 32, so that the first lower header. 41 or the second lower header 42. Thereafter, the dew condensation water reaches the drain pan 8 and is led out of the indoor unit 1 and drained outside the room.

  As described above, the heat exchanger 2A has the second flat tube 32 disposed in the vertical lower portion of the first upper header 6A1, and the first flat tube 31 disposed in the vertical lower portion of the second upper header 6A2. Therefore, the condensed water falling from the first upper header 6A1 can be trapped by the second flat tube 32, and the condensed water falling from the second upper header 6A2 can be trapped by the first flat tube 31. The first flat tube 31 can guide the flow down to the periphery of the first lower header 41, and the second flat tube 32 can guide the flow down to the periphery of the second lower header 42. Therefore, it is possible to avoid the release of condensed water to the air passage 7 and to improve the drainage of the condensed water.

  FIG. 4 is a (a) principal part side view (b) principal part bottom view of the upstream heat exchanger installed on the upstream side of the indoor unit 1. In the upstream heat exchanger 14, the upper header 5 is single like the upper header 6A of the heat exchanger 2A shown in FIG. 2, but the flat tubes 3 provided below the upper header 5 intersect each other. Absent. For this reason, when condensed water is generated in the upper header 5, in the area A of FIG. 4, the condensed water is transmitted from the connecting portion of the upper header 5 and the flat tube 3 to the lower portion on the front side by the condensed force of the condensed water Although it flows to the header or the lower header on the rear side, there is no narrow portion where condensed water is condensed and guided in the area B, and there is a possibility that water drops may fall into the air blowing path 7 of the indoor unit 1 as it is. .

  For this reason, in order to avoid such a fall to the air flow path 7, it is necessary to install a drain pan 8 or a member equivalent thereto that traps the liquid drop falling directly below the upper header 5 and guides it to the outside. However, when the drain pan 8 is installed, the air blower 7 itself becomes an obstacle, and there is a concern that the air blowing performance of the indoor unit 1 is deteriorated.

  However, in the present embodiment, since the heat exchanger 2A is arranged at the lower part of the upstream heat exchanger 14, the heat exchanger 2A receives the condensed water dripping from the region B in FIG. Furthermore, the first flat tube 31 and the second flat tube 32 of the heat exchanger 2A have a role of guiding water droplets to flow down to the first lower header 41 or the second lower header 42 side. . For this reason, it is preventing that dew condensation water falls in the ventilation path 7. FIG.

  Furthermore, since the upper header 6A of the heat exchanger 2A has an inverted V shape (convex upward), even when condensed water is generated on the top surface of the upper header 6A, the upper header 6A is caused by the gravitational action. It is easy to flow down to the first flat tube 31 or the second flat tube 32 in the vertically lower part of 6A, and the dew condensation water is difficult to stay on the top surface portion of the upper header 6A.

  In addition, the first upper header 6A1 and the second upper header 6A2 are integrated, and the upper header 6A is integrated, so that the number of parts can be reduced and the cost can be reduced.

  In the present embodiment, the upstream heat exchanger 14 is a parallel flow heat exchanger, but is not limited to a parallel flow heat exchanger, and a fin tube heat exchanger may be disposed. Further, the heat exchanger 2 </ b> A may be adopted as the upstream heat exchanger 14.

  The operation when the indoor unit 1 including the heat exchanger 2A configured as described above is mounted on the heat pump air conditioner and the air conditioning operation is performed will be described.

  FIG. 5 is a schematic configuration diagram of the refrigeration cycle circuit 18 of the air conditioner including the indoor unit 1 on which the heat exchanger 2A of the present embodiment is mounted.

  In FIG. 5, the refrigeration cycle circuit 18 is connected in the order of a compressor 19, a four-way valve 20, an outdoor heat exchanger 21, an expansion valve 22, and a heat exchanger provided in the indoor unit 1. By switching, it is a reversible refrigeration cycle circuit 18 capable of both cooling and heating operations.

  The cooling mode operation is realized by communicating the refrigerant path from the discharge side of the compressor 19 to the outdoor heat exchanger 21 and from the heat exchanger provided in the indoor unit 1 to the compressor 19 suction side. At this time, the outdoor heat exchanger 21 operates as a condenser that radiates heat to the surrounding medium, and the heat exchanger provided in the indoor unit 1 operates as an evaporator that absorbs heat from the ambient air.

  The heating mode operation is realized by communicating the refrigerant path from the discharge side of the compressor 19 to the heat exchanger provided in the indoor unit 1 and from the outdoor heat exchanger 21 to the compressor 19 suction side. At this time, the heat exchanger provided in the indoor unit 1 operates as a condenser that radiates heat to the surrounding medium, and the outdoor heat exchanger 21 operates as an evaporator that absorbs heat from the ambient air.

  In the present embodiment, when the heat exchanger 2A is operated as an evaporator as in the above-described cooling operation, even if the condensed water generated in the upper header 6A falls, the narrow portion does not condense the condensed water. Since it can supplement and can guide to the drain pan 8 promptly, it can prevent that dew condensation water splashes to the ventilation path 7. FIG.

(Modification 1)
A heat exchanger 2B that is a modification of the heat exchanger 2A will be described. FIG. 6: is the (a) principal part side view (b) principal part bottom view of the heat exchanger 2B which is a modification in the 1st Embodiment of this invention. The installation state of the heat exchanger 2B in the indoor unit 1 of the air conditioner is the same as that of the heat exchanger 2A described in FIG. 1, and the refrigeration cycle circuit 18 is the same as that shown in FIG. .

  In FIG. 6, the first flat tube 31 extending from the first lower header 41 and the second flat tube 32 extending from the second lower header 42 are the lower region of the upper header 6B (horizontal projection of the upper header 6B). The flat portions 3b are in contact with each other.

  Also in the heat exchanger 2B, the entire lower surface portion of the upper header 6A is covered by the first flat tube 31 and the second flat tube 32, and further, the first flat tube 31 and the first fin 151, The size of the narrow portion formed by the two flat tubes 32 and the second fins 152 is the same. For this reason, the narrow portion formed below the upper header 6A has the same effect as that of the heat exchanger 2A in trapping the condensed water. Even when the condensed water generated in the upper header 6A falls, When the narrow portion supplements the condensed water, it is possible to prevent the condensed water from being scattered to the air blowing path 7.

  Further, as in the heat exchanger 2A, the second flat tube 32 is located at the center between the adjacent first flat tubes 31 or the first flat tube is positioned at the center between the adjacent second flat tubes 32. Since the pipe 31 is not positioned, the ventilation resistance of the air passing between the first flat pipe 31 and the second flat pipe 32 can be reduced.

(Modification 2)
A heat exchanger 2C, which is another modification of the heat exchanger 2A, will be described. FIG. 7: is the (a) principal part side view (b) principal part bottom view of 2 C of heat exchangers which are the modifications in the 1st Embodiment of this invention. The installation state of the heat exchanger 2C in the indoor unit 1 of the air conditioner is the same as that of the heat exchanger 2A described in FIG. 1, and the refrigeration cycle circuit 18 is the same as that shown in FIG. is there.

  In FIG. 7, the cross-sectional structure of the upper header 6C is not an inverted V-shape but a circle. Also in this case, since the top surface portion of the upper header 6C is formed with a curved surface as in the inverted V shape, it is possible to obtain an effect of suppressing the retention of condensed water on the top surface portion.

  In addition, in FIG. 7, when viewed from the side of the heat exchanger 2 </ b> C, at the intersecting portion 23 of the first flat tube 31 and the second flat tube 32 on the lower surface of the upper header 6 </ b> C, a part of each flat tube intersects. However, even in this embodiment, the entire lower surface portion of the upper header 6C is covered with the first flat tube 31 or the second flat tube 32. Further, the size of the narrow portion formed by the first flat tube 31 and the first fin 151, and the second flat tube 32 and the second fin 152 is the same. For this reason, the effect in trapping the dew condensation water is the same as that of the heat exchanger 2A. Even when the dew condensation water generated in the upper header 6C falls, the narrow portion supplements the dew condensation water, thereby blowing air. It is possible to prevent the condensed water from scattering to the road 7.

(Embodiment 2)
A heat exchanger according to a second embodiment of the present invention will be described. In addition, about the same structure as the structure demonstrated in Embodiment 1, the same number as Embodiment 1 is attached | subjected and description is abbreviate | omitted.

  FIG. 8: is the (a) principal part side view (b) principal part bottom view of heat exchanger 2D in the 2nd Embodiment of this invention. The installation state of the heat exchanger 2D in the indoor unit 1 of the air conditioner is the same as that of the heat exchanger 2A described in FIG. 1 except for the upper header 6D, and the refrigeration cycle circuit 18 is also shown in FIG. The same as shown in

  In FIG. 8, the upper header 6D includes a first upper header 6D1 and a second upper header 6D2 each having a pair of circular cross sections. The first upper header 6D1 and the second upper header 6D2 are installed in parallel, and a gap C is provided between them. In addition, a connecting pipe 24 that is a U-bent is provided at the axial ends of the first upper header 6D1 and the second upper header 6D2, and the first upper header 6D1 and the second upper header 6D2 are provided. The internal spaces of each are communicated. For this reason, for example, the refrigerant flowing into the first upper header 6D1 through the first flat tube 31 is allowed to flow to the second upper header 6D2 via the connecting tube 24.

  The width of the gap C may be large enough as long as it is a size that can be accommodated in the indoor unit 1 and does not interfere with other elements constituting the indoor unit 1.

  About the heat exchanger 2D comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As in the first embodiment, the dew condensation water generated in the upper header 6D is trapped by the first flat tube 31 and the second flat tube 32 installed therebelow, and then the first flat tube 31 is used. Or it can guide to the drain pan 8 around the first lower header 41 or the second lower header 42 as a guide for condensed water flowing down by the second flat tube 32.

As described above, a gap C is provided between the pair of upper headers 6 </ b> D shown in FIG. 7 so that air driven by the cross flow fan 9 can flow in. As a result, the air flow around the first flat tube 31 and the second flat tube 32 immediately below the gap C is promoted, and the first
It is possible to promote heat exchange between the refrigerant flowing through the fine tube inside the flat tube 31 or the second flat tube 32 and the air flowing outside the first flat tube 31 or the second flat tube 32. Thus, the heat exchange performance can be further improved.

(Modification)
A heat exchanger 2E that is a modification of the heat exchanger 2D will be described. FIG. 9: is the (a) principal part side view (b) principal part bottom view of the heat exchanger 2E which is a modification in the 2nd Embodiment of this invention. The installation state of the heat exchanger 2E in the indoor unit 1 of the air conditioner is the same as that of the heat exchanger 2A described in FIG. 1, and the refrigeration cycle circuit 18 is the same as that shown in FIG. .

  As shown in FIG. 9, the upper header 6E of the heat exchanger 2E includes a first upper header 6E1 and a second upper header 6E2. Each of the first upper header 6E1 and the second upper header 6E2 has a rectangular cross-sectional shape, is installed like a letter C, and has a convex shape upward. .

  Even in this case, it is possible to obtain the same effect as that of the pair of upper headers 6D having the circular cross section described above.

  As described above, the heat exchanger according to the present embodiment includes the refrigerant flowing through the flat tube 3 including a plurality of fine tubes and the outside of the flat tube 3 that constitutes the indoor unit 1 of the air conditioner. It is a parallel flow type heat exchanger 2A, 2B, 2C, 2D, 2E that exchanges heat with air, and is provided with a flat tube 3 so that the refrigerant flows in the vertical direction. Lower headers 41 and 42 and upper headers 6A, 6B, 6C, 6D, and 6E, which are headers for distributing and merging refrigerant, are provided, and the flat tube 3 is a pair of lower headers 41 that are arranged apart from each other. , 42 extending in a direction intersecting with each other upward, and upper headers 6A, 6B, 6C, 6D, 6E connected to the other flat tube 3 are arranged in the vertical upper part of one flat tube 3. is there.

  According to the present invention, the flat tubes 3 can be arranged respectively from the upper headers 6A, 6B, 6C, 6D, 6E toward the pair of lower headers 41, 42 that are arranged apart from each other. 6A, 6B, 6C, 6D, and 6E can be used to secure a heat exchange unit (front side heat exchange unit 16 and back side heat exchange unit 17) in both directions. Can be secured not only on the front side but also on the back side, and performance improvement by securing a heat exchange area can be secured.

  Further, since the upper headers 6A, 6B, 6C, 6D, and 6E are always arranged on the upper portion of the flat tube 3, even when the condensed water generated in the upper headers 6A, 6B, 6C, 6D, and 6E is scattered, Is trapped by a flat tube 3 having a narrow part that is easily trapped (the narrow part is composed of pipes, pipes-fins, fins-fins, etc.), and then flows down to the lower headers 41 and 42 without scattering. Therefore, even when the drain pan 8 is downsized, it is possible to avoid the release of condensed water into the air passage 7 and the cooling target space (room). It becomes possible.

  Furthermore, dew condensation water generated on the top surface of the upper headers 6A, 6B, 6C, 6D, 6E by making the cross-sectional shape of the upper headers of the heat exchangers 2A, 2B, 2C, 2D, 2E convex upward It becomes easy to flow down to the lower part due to its own weight action, and it becomes possible to improve the drainage of the top surface portions of the upper headers 6A, 6B, 6C, 6D, 6E.

Furthermore, the upper header is made into a pair of upper headers 6D and 6E which are arranged close to each other and securing a gap, and a pair of upper headers 6D and 6E are arranged at the ends thereof by arranging a connecting pipe 24 which is a bypass pipe. Since air can be sucked in as much as possible between the headers 6D and 6E, the heat exchange performance between the sucked air at that portion and the refrigerant in the flat tube 3 is improved, and further high efficiency can be realized.

  Furthermore, since the number of parts can be reduced by making the upper header a single upper header 6A, 6B, 6C, cost reduction can be realized.

  Furthermore, since the heat exchange area can be further ensured by arranging the upstream heat exchanger 14 at the upper portion, it is scattered from the upstream heat exchanger 14 provided on the upper side while realizing high efficiency. Condensed water can also be trapped by the flat tubes 3 of the heat exchangers 2A, 2B, 2C, 2D and 2E, and the drainage of the condensed water can be secured.

  As described above, the heat exchanger according to the present invention can secure a heat exchange area on both the front and rear surfaces in a parallel flow heat exchanger for an air conditioner indoor unit. It is possible to provide indoor units that can achieve the cooling and heating capability of the air conditioner, and even if the installation area of the drain pan is reduced, the drainage from the upper header can be secured, so high-performance air conditioning that can suppress the deterioration of the blowing performance An indoor unit can be provided.

DESCRIPTION OF SYMBOLS 1 Indoor unit 2A Heat exchanger 2B Heat exchanger 2C Heat exchanger 2D Heat exchanger 2E Heat exchanger 3 Flat tube 3a Fine tube 3b Flat part 3c Side part 5 Upper header 6A Upper header 6A1 First upper header 6A2 Second Upper header 6B upper header 6C upper header 6D upper header 6D1 first upper header 6D2 second upper header 6E upper header 6E1 first upper header 6E2 second upper header 7 air passage 8 drain pan 9 crossflow fan 10 filter 11 Casing 12 Suction port 13 Outlet 14 Upstream heat exchanger 15 Fin 16 Front side heat exchange unit 17 Rear side heat exchange unit 18 Refrigeration cycle circuit 19 Compressor 20 Four-way valve 21 Outdoor heat exchanger 22 Expansion valve 23 Intersection 24 Connection Tube 26 Front side heat exchange unit 27 Rear side heat exchange unit 31 First flat tube 32 Second Tairakan 41 first lower header 42 a second lower header 91 indoor unit 92 heat exchanger 151 first fin 152 second fin

Claims (7)

A first upper header provided in a horizontal direction, a first lower header provided in parallel to the first upper header, and provided between the first upper header and the first lower header A plurality of first flat tubes, and first fins provided between the first flat tubes,
A second upper header provided in parallel with the first upper header; a second lower header provided at a position away from the first lower header; the second upper header; and the second A plurality of second flat tubes provided between the lower header and a second fin provided between the second flat tubes,
The heat exchanger, wherein the second flat tube is disposed on a horizontal projection surface of the first upper header, and the first flat tube is disposed on a horizontal projection surface of the second upper header. In the vicinity of the first upper header or the second upper header,
The heat exchanger according to claim 1, wherein the second flat tube is arranged between the first flat tubes. In the vicinity of the first upper header or the second upper header,
The heat exchanger according to claim 1 or 2, wherein the first flat tube and the second flat tube are in contact with each other. The heat according to any one of claims 1 to 3, wherein the first upper header and the second upper header are arranged so that a cross-sectional shape is a convex shape upward. Exchanger. The first upper header and the second upper header are arranged at positions spaced apart by a shorter interval than the first lower header and the second lower header, and the first upper header and The heat exchanger according to any one of claims 1 to 4, wherein the second upper header is connected by a connecting pipe. The heat exchanger according to any one of claims 1 to 5, wherein the first upper header and the second upper header are integrally formed. A heat exchanger in which another heat exchanger is arranged on the upper part in the vertical direction of the heat exchanger according to any one of claims 1 to 6.