JP2015169358A - heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which, in the case where flat plate-like heat exchangers are connected, a connection member is necessary; however, as heat exchange is not performed in the connection member portion, it becomes dead space, and performance as a heat exchanger cannot be fully exerted in a limited space.SOLUTION: A plurality of flat tubes 4 and corrugated fins provided between the plurality of flat tubes 4 are provided. The flat tube 4 has a linear part 4S in which a flat part becomes linear, and a bent part 4C which is bent in a horizontal direction of the flat part. A side part of the linear part 4S is not provided horizontally.

Description

  The present invention relates to a parallel flow heat exchanger having corrugated fins.

  Conventionally, a plurality of heat exchangers incorporated in an air conditioner are usually connected so as to surround a cross flow fan, particularly in an indoor unit of a separate type air conditioner. Even in a heat exchanger unit using parallel flow heat exchangers with corrugated fins, when arranging heat exchangers in a limited space, a plurality of flat heat exchangers are connected so as to surround the cross flow fan. And stored in the casing (see, for example, Patent Document 1).

JP 2011-47600 A

  However, the conventional arrangement method requires a connecting member for connecting the flat heat exchangers to each other. Since heat is not exchanged at the connecting member portion, it becomes a dead space, and the performance as a heat exchanger unit cannot be sufficiently exhibited in a limited space.

  An object of the present invention is to improve the performance of a heat exchanger unit by effectively using a limited space by suppressing a dead space due to a connecting member including a header in a parallel flow heat exchanger having corrugated fins. In addition, the water condensed on the heat exchanger is prevented from falling or scattering from the heat exchanger.

  In order to solve the above-mentioned conventional problems, the heat exchanger of the present invention is a parallel flow heat exchanger having corrugated fins, wherein the flat tube has a straight portion in which the flat portion is linear, and a horizontal portion of the flat portion. The side part of the straight line part is not provided horizontally.

  Further, in the heat exchanger of the present invention, the flat tube is provided in parallel with the flow direction of the fluid flowing between the corrugated fins, and at least the most downstream flat tube has a straight portion in which the flat portion is linear. And a bent part bent in the horizontal direction of the flat part, and the side part of the straight part is not provided horizontally.

  ADVANTAGE OF THE INVENTION According to this invention, in the parallel flow heat exchanger which has a corrugated fin, a dead space can be suppressed, the effective area of a heat exchanger can be increased in the limited space, and dew condensation water is used as a heat exchanger. It can prevent falling or scattering more.

Sectional drawing of the indoor unit provided with the heat exchanger of Embodiment 1 of this invention The block diagram in the state before the bending process of the heat exchanger of Embodiment 1 of this invention Sectional drawing in the state before the bending process of the heat exchanger of Embodiment 1 of this invention Explanatory drawing which shows the procedure of the bending process of the heat exchanger of Embodiment 1 of this invention Relationship diagram between horizontal angle and condensation of parallel flow heat exchanger Refrigeration cycle diagram of a heat pump air conditioner including the heat exchanger according to Embodiment 1 of the present invention Sectional drawing of the indoor unit provided with the heat exchanger of Embodiment 2 of this invention Refrigeration cycle diagram of a heat pump air conditioner provided with a heat exchanger according to Embodiment 2 of the present invention

  A first invention includes a plurality of flat tubes and corrugated fins provided between the plurality of flat tubes, and the flat tubes include a straight portion in which a flat portion is linear, and a horizontal direction of the flat portion. A heat exchanger that is not horizontally provided with a side portion of the straight line portion.

  As a result, when the heat exchanger unit becomes an evaporator, the condensed water generated in the fins and flat tubes reaches the water receiver along the louvers, corrugated fins and flat tubes by gravity without staying in place. Therefore, it is possible to prevent the condensed water from falling from the heat exchanger.

  A second invention includes a plurality of flat tubes and corrugated fins provided between the plurality of flat tubes, and the flat tubes are arranged in parallel with a flow direction of fluid flowing between the corrugated fins. At least the most downstream flat tube has a straight portion where the flat portion is straight and a bent portion bent in the horizontal direction of the flat portion, and the side portion of the straight portion is provided horizontally. It is not a heat exchanger.

  As a result, some condensed water generated by the fins in the windward row and the flat tubes in the windward row falls to the heat exchanger on the most leeward side. Since it reaches the end of the flat tube through the fins of the heat exchanger in the leeward row, it is possible to prevent the condensed water from falling from the heat exchanger. Further, since the degree of freedom in designing the heat exchangers in the windward row is expanded, the heat exchangers in the windward row can be made larger.

  According to a third invention, in the first or second invention, the side surface of the linear portion is provided with an inclination of 10 ° or more from the horizontal. Thereby, dew condensation water does not fall from a heat exchanger, or is scattered.

  Below, the heat exchanger unit of this invention is demonstrated. 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 a heat exchanger according to Embodiment 1 of the present invention.

  The indoor unit 10 includes a casing 26 that forms an outer shell, and includes the heat exchanger 1 therein. Further, the casing 26 is provided with a front opening 10 a located on the front side of the heat exchanger 1 and an upper surface opening 10 b located on the upper surface side of the heat exchanger 1.

  The front opening 10a is provided with a movable front panel (hereinafter simply referred to as a front panel) 11 that can be freely opened and closed. The front panel 11 closes the front opening 10a when the air conditioner is stopped, but moves in a direction away from the casing 26 to open the front opening 10a when the air conditioner is operating (front opening 10a). (The state in which 10a is closed is not shown).

The indoor unit 10 also blows out the heat exchanged air indoors with a fan 12 for exchanging the indoor air taken in from the front opening 10a and the upper surface opening 10b in the heat exchanger 1 and blowing the air indoors. The blower outlet 13 is provided. The air outlet 13 is provided with an up / down air direction changing blade 14 that opens and closes an opening and changes the air blowing direction up and down, and a left and right air direction changing blade 15 that changes the air blowing direction left and right.

  The upper and lower airflow direction changing blades 14 are a lower blade 19 that opens and closes the air outlet 13, and an upper blade that is provided above the lower blade 19 and controls the blowing direction of air blown from the air outlet 13 in cooperation with the lower blade 19. 20. The lower blade 19 is connected to a drive shaft (not shown), while the upper blade 20 is connected to a drive shaft (not shown), and each drive shaft (not shown) is a drive source such as a drive motor ( (Not shown).

  When the air conditioner starts operation, the up-and-down air direction changing blade 14 is controlled to open, the air outlet 13 is opened, and the fan 12 is driven, so that the indoor air passes through the front opening 10a and the upper opening 10b. It is taken into the interior of the indoor unit 10. The taken indoor air exchanges heat with the heat exchanger 1, passes through the fan 12, passes through the ventilation path 21 formed on the downstream side of the fan 12, and is blown out from the blower outlet 13.

  Moreover, the blowing direction of the air from the blower outlet 13 is controlled by the up / down air direction changing blade 14 and the left / right air direction changing blade 15, and the up / down direction angle of the up / down air direction changing blade 14 and the left / right direction angle of the left / right air direction changing blade 15 are It is controlled by a remote control (remote operation device) that controls the indoor unit 10.

  Further, the ventilation path 21 located on the upstream side of the air outlet 13 includes a rear guider 22 located on the downstream side of the fan 12, a stabilizer 23 located on the downstream side of the fan 12 and facing the rear guider 22, and left and right side walls 24. It is formed with.

  The term “stabilizer” described above is located near the downstream of the fan 12, stabilizes the vortex generated near the front of the fan 12, and is located downstream of the stabilizer and conveyed by the fan 12. Although it can also be divided into the front wall portion of the diffuser responsible for air pressure recovery, these are collectively referred to as “stabilizer” in the present specification.

  With this configuration, the blowout air is sandwiched between the up / down wind direction changing blades 14 (the lower blade 19 and the upper blade 20) and the left and right side walls 24 inside the air outlet 13 and is changed without leaking up, down, left, and right. On the other hand, on the outside of the air outlet 13, on the outside of the air outlet 13, even if the blowing air changed to the left and right is blown further left and right than the left and right ends of the air outlet 13, The up / down and left / right changing directions can be maintained without being diffused by the up / down air direction changing blades 14 extended outward from the side wall 24.

  Furthermore, in the indoor unit 10, dust contained in room air taken in from the front opening 10 a and the upper opening 10 b is removed between the front opening 10 a and the upper opening 10 b and the heat exchanger 1. The filter 16 is provided. This filter 16 is attached to a filter frame 17 a provided in the casing 26.

  The casing 26 is provided with water trays 18a and 18b for receiving and draining the dew condensation water from the heat exchanger 1. The water tray 18 a is provided on the front side from the stabilizer 23, and the water tray 18 b is provided on the back side from the upper end of the rear guider 22.

  Furthermore, a display unit 41 that displays the operating state of the air conditioner and the like is provided on the lower front side of the filter 16 and above the outlet 13.

  Here, the heat exchanger 1 will be described in detail.

  The heat exchanger 1 includes a plurality of flat tubes 4, header pipes 2 and 3 provided at both longitudinal ends of the flat tubes 4, and corrugated fins provided between the plurality of flat tubes 4. A parallel flow heat exchanger.

  The flat tube 4 is an elongated flat plate-like heat transfer tube having a refrigerant passage 5 therein, and its outer surface has two flat portions 4a facing each other and two side portions connecting the two flat portions 4a. 4b (see FIG. 3).

  The heat exchanger 1 is bent in the horizontal direction of the flat portion 4a of the flat tube 4 by a bending process described later. That is, the flat tube 4 includes a straight portion 4S in which the flat portion 4a is linear, and a bent portion 4C bent in the horizontal direction of the flat portion 4a. As shown in FIG. 1, the flat tube 4 has three straight portions 4S and two bent portions 4C, and is formed in a substantially U shape.

  In the heat exchanger 1, the flat portion 4a of the flat tube 4 is parallel to the depth direction of the indoor unit 10 so that the longitudinal direction of the header pipes 2 and 3 is parallel to the width direction of the indoor unit 10. It is provided in the indoor unit 10. In the heat exchanger 1, the header pipes 2 and 3 are arranged above the water trays 18 a and 18 b, respectively, and the flat tube 4 formed in a substantially U shape surrounds the fan 12. The

  Moreover, the heat exchanger 1 is provided so that the side part 4b of the linear part 4S does not become horizontal with the ground in the normal installation state of the indoor unit 10. In the heat exchanger 1, in the straight portion 4S located on the upper front side of the fan 12 with the smallest inclination, the center line 52 of the flat tube 4 is 10 ° with respect to the horizontal line 51 when the indoor unit 10 is installed. It is provided so as to be inclined as described above. By comprising in this way, the dew condensation water which arises in the heat exchanger 1 at the time of air_conditionaing | cooling operation is dropped from the surface of the heat exchanger 1, and is not scattered with air in a room | chamber interior.

  In addition, the inclination angle of the linear portion 4S disposed above the fan 12 and behind the central axis of the fan 12 is larger than the inclination angle of the linear portion 4S disposed forward of the central axis of the fan 12. Is provided.

  Furthermore, the part arrange | positioned ahead of the fan 12 among the heat exchangers 1 is comprised from the two linear parts 4S and the one bending part 4C so that it may protrude ahead in a substantially square shape. The inclination angle of the straight line portion 4S that constitutes the substantially U-shaped protrusion is provided to be larger than the inclination angle of the straight line portion 4S located on the upper front side of the fan 12. Further, the center line of the flat tube 4 in the bent portion 4 </ b> C constituting the protruding portion is provided at a position in front of the header pipe 2.

  By comprising in this way, the effective area of a heat exchanger can be increased within the limited space.

  Next, the bending process of the heat exchanger 1 will be described with reference to FIGS. FIG. 2 is a configuration diagram of the heat exchanger 1 before bending. FIG. 3 is a cross-sectional view of the heat exchanger of FIG.

  First, the structure of the heat exchanger 1 is demonstrated in detail using FIG.

In the heat exchanger 1, two header pipes 2 and 3 are arranged in parallel at intervals, and a plurality of flat tubes 4 are arranged at a predetermined pitch between the header pipes 2 and 3. The flat tube 4 is an elongated molded product obtained by extruding a metal, and a plurality of rectangular refrigerant passages 5 are formed in each of the flat tubes through which the refrigerant flows.

  Each refrigerant passage 5 communicates with the inside of the header pipes 2 and 3, and corrugated fins 6 are disposed between the adjacent flat tubes 4.

  The outermost corrugated fin 6a is disposed on the outer surface of the flat tube 4 positioned on the outermost side, and the side plate 7 is disposed outside the outermost corrugated fin 6a.

  The header pipes 2 and 3, the flat tube 4, the corrugated fin 6, the outermost corrugated fin 6 a, and the side plate 7 are all made of a metal having good heat conductivity such as aluminum. The flat tube 4 is fixed to the header pipes 2 and 3 by brazing or welding to the corrugated fin 6 and the outermost corrugated fin 6a to the flat tube 4, and the side plate 7 to the outermost corrugated fin 6a. Note that a louver 25 is processed on the corrugated fins 6 and 6a.

  Next, the procedure for providing a bending part in the heat exchanger 1 comprised as mentioned above is demonstrated.

  FIG. 4 is an explanatory view for explaining a bending process of the heat exchanger 1. In the state of bending, the heat exchanger 1 has a flat plate shape as shown in FIG. In order to provide the heat exchanger 1 with a bent portion, as shown in FIG. 3 (b), the bending die 8 is applied to the side portion 4b of the flat tube 4 so that the longitudinal direction of the flat tube 4 is substantially perpendicular. Touch.

  Next, as shown in FIG. 4 (c), the header pipe 2 is fixedly held by a fixing jig (not shown), and the other header pipe 3 is clamped by a bending drive unit (not shown) of a bending device. Press toward the bending mold 8. As a result, the heat exchanger 1 can be bent at a predetermined angle.

  Further, as shown in FIG. 4D, another part of the heat exchanger 1 is bent in the same manner using a bending die 9 having a curvature different from that of the bending die 8. Thus, two or more predetermined bendings are performed on one heat exchanger 1.

  In the bending process as described above, the flat tube 4 and the corrugated fins 6 and 6a are bent integrally with the flat tube 4 in the horizontal direction of the flat portion 4a, and the flat tube 4 and the corrugated fin are 6 and 6a are bent at substantially the same bending angle.

  Here, the inclination angle from the horizontal of the heat exchanger 1 and the results of experiments measuring the amount of condensation that does not fall from the heat exchanger 1 will be described.

  FIG. 5 is a relationship diagram between the angle from the horizontal of the heat exchanger 1 created based on the experimental results and the amount of condensation.

  The angle from the horizontal of the horizontal axis is the angle between the center line of the flat tube 4 and the horizontal line when the header pipe 2 and the header pipe 3 have a vertical positional relationship. The vertical axis represents the ratio of the amount of condensation that does not fall (can be held) from the heat exchanger 1 to the amount of condensation that is assumed during normal operation of the indoor unit 10 of the air conditioner. In the experiment, measurement was performed while air having a wind speed of about 3 m / s was passed through the heat exchanger 1.

From FIG. 5, it can be seen that when the inclination angle is less than about 8 °, the condensation rate magnification is less than 0 times, and the condensed water falls from the heat exchanger 1. When the inclination angle is about 8 ° or more, even if the amount of condensation increases as the angle increases, the condensed water flows through the flat tubes 4 and the corrugated fins 6 to the header pipe 2 or 3 on the lower side. It can be seen that the fall of condensed water from the surface of the vessel 1 can be prevented.

  In addition, when the angle is about 10 °, the amount of condensed water is about 18 times, and when the angle is about 10 °, it can be understood that the condensed water can be prevented with a slight margin.

  The operation when the indoor unit 10 including the heat exchanger 1 configured as described above is mounted on the heat pump air conditioner and the air conditioning operation is performed will be described.

  FIG. 6 is a refrigeration cycle diagram of a heat pump air conditioner including the heat exchanger 1 of the first embodiment.

  The configuration of the heat pump air conditioner will be described. A compressor 31 that compresses refrigerant, a four-way valve 32 that switches a refrigerant circuit during cooling and heating operation, an outdoor heat exchanger 33 that exchanges heat of the outside air with the refrigerant that becomes a condenser during cooling and an evaporator during heating, and an outdoor heat exchanger 33, an outdoor fan 38 for promoting heat exchange between the refrigerant flowing in the refrigerant and the outside air, a throttling device 34 for depressurizing the refrigerant, a heat exchanger 1 for exchanging the heat of the refrigerant and the indoor air, an evaporator during cooling and a condenser during heating, A fan 12 that promotes heat exchange between the refrigerant flowing in the heat exchanger 1 and room air and an accumulator 36 provided on the suction side of the compressor 31 are provided.

  The outdoor unit 42 includes a compressor 31, a four-way valve 32, an outdoor heat exchanger 33, an expansion device 34, an accumulator 36, and an outdoor fan 38, and is connected to the indoor unit 10 by a liquid side connection pipe 43 and a gas side connection pipe 44. Has been.

  The operation of the heat pump air conditioner configured as described above will be described.

  First, during the cooling operation, the refrigerant compressed by the compressor 31 becomes a high-temperature and high-pressure refrigerant and is sent to the outdoor heat exchanger 33 through the four-way valve 32. Then, the outdoor fan 38 promotes heat exchange with the outside air to dissipate heat and becomes a high-pressure liquid refrigerant that is sent to the expansion device 34. In the expansion device 34, the pressure is reduced to form a low-temperature and low-pressure two-phase refrigerant, which is sent to the heat exchanger 1 through the liquid side connection pipe 43.

  The indoor air sucked by the fan 12 exchanges heat with the refrigerant through the heat exchanger 1, and the refrigerant absorbs the heat of the indoor air and evaporates to become a low-temperature gas refrigerant. At this time, the indoor air absorbed by the refrigerant is lowered in temperature and humidity and blown out into the room by the fan 12 to cool the room. At this time, depending on the operating conditions, condensed water is generated in the flat tubes 4 and the corrugated fins 6 of the heat exchanger 1.

  However, in the present embodiment, the flat tube 4 and the corrugated fin 6 are inclined at an angle of 10 ° or more from the horizontal, so that the condensed water does not stay in place but by gravity, the louver 25 and the corrugated fin 6 and The water receivers 18a and 18b are reached along the flat tube 4. The condensed water that has reached the water receivers 18a and 18b is led out of the indoor unit 10 and drained outside the room (not shown).

  The gas refrigerant passes through the gas side connection pipe 44 and enters the four-way valve 32, and returns to the compressor 31 through the accumulator 36.

On the other hand, during the heating operation, the refrigerant compressed by the compressor 31 becomes a high-temperature and high-pressure refrigerant, passes through the four-way valve 32, and is sent to the gas side connection pipe 44. The indoor air sucked by the fan 12 exchanges heat with the refrigerant through the heat exchanger 1, and the refrigerant dissipates heat to the indoor air and condenses to become a high-pressure liquid refrigerant. At this time, the indoor air absorbs the heat of the refrigerant and is blown into the room by the fan 12 in a state where the temperature is raised, thereby heating the room. Thereafter, the refrigerant is sent to the expansion device 34 through the liquid side connection pipe 43, and is reduced in pressure by the expansion device 34 to become a low-temperature and low-pressure two-phase refrigerant, is sent to the outdoor heat exchanger 33, and the outdoor fan 38 Heat exchange is promoted to evaporate, and the vapor is returned to the compressor 31 through the accumulator 36 through the four-way valve 32.

  In this way, the air conditioning operation is performed.

  In the present embodiment, the flat tube 4 and the corrugated fins 6 and 6a are bent at substantially the same bending angle and housed in the casing 26, so that dead space can be suppressed and the heat exchanger is effective in a limited space. The area can be increased.

  In addition, when placed in the casing 26 and installed in a normal use state, the heat exchanger 1 is arranged so that there is no horizontal part other than the bent portion 4C, and the heat is increased by 10 ° or more from the horizontal. When the exchanger 1 is an evaporator, the condensed water generated in the corrugated fins 6 and 6a and the flat tube 4 does not stay on the spot, and is moved along the louver 25, the corrugated fins 6 and 6a and the flat tube 4 by gravity. Therefore, it is possible to prevent the condensed water from falling from the heat exchanger 1 because the water receivers 18a and 18b are reached.

  In the present invention, when a part of the bent portion 4C of the heat exchanger 1 is horizontal, the tape is used to prevent air from passing through the horizontal portion so that dew condensation is not generated by heat exchange in the horizontal portion. If it sticks, the fall of the dew condensation water from the heat exchanger 1 can be prevented more reliably.

(Embodiment 2)
A heat exchanger according to a second embodiment of the present invention will be described.

  The same configurations and operations as those described in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

  FIG. 7 is a cross-sectional view of an indoor unit including the heat exchanger according to Embodiment 2 of the present invention. In the heat exchanger 1, the flat tubes 4 are provided in two rows in parallel with the flow direction of the fluid (room air) flowing between the corrugated fins 6. In each row, a windward side heat exchanging portion 1a and a leeward side heat exchanging portion 1b including a plurality of flat tubes 4 and header pipes provided at both ends in the longitudinal direction of the flat tubes 4 are configured. .

  The windward side heat exchange part 1a and the leeward side heat exchange part 1b are bent at different angles. In addition, the refrigerant flow paths (not shown) of each of the windward side heat exchanging portion 1a and the leeward side heat exchanging portion 1b communicate with each other in either the upper or lower header pipe.

  The windward side heat exchanging portion 1 a is bent in the horizontal direction of the flat portion 4 a of the flat tube 4. That is, the flat tube 4 constituting the windward side heat exchanging portion 1a includes a straight portion 4S in which the flat portion 4a is linear, and a bent portion 4C bent in the horizontal direction of the flat portion 4a. As shown in FIG. 7, in the windward heat exchange section 1a, the flat tube 4 has three straight portions 4S and two bent portions 4C, and is formed in a substantially U shape.

In addition, in the linear portion 4S located on the upper front side of the fan 12 in the windward side heat exchanging portion 1a, the side portion 4b is provided to be horizontal. On the other hand, the straight portion 4S disposed above the fan 12 and behind the central axis of the fan 12 is provided to be inclined. Furthermore, the part arrange | positioned ahead of the fan 12 among the wind-side heat exchange parts 1a is comprised from the two linear parts 4S and one bending part 4C so that it may protrude ahead in a substantially square shape. Yes. Further, the center line of the flat tube 4 in the bent portion 4C constituting the protruding portion is provided at a position in front of the lower header pipe 2 constituting the upwind heat exchange portion 1a.

  The leeward side heat exchanging portion 1b is also bent in the horizontal direction of the flat portion 4a of the flat tube 4. And as shown in FIG. 7, the flat tube 4 has the three linear parts 4S and the two bending parts 4C, and is formed in the substantially U shape. However, in the leeward side heat exchanging portion 1b, at least one or more bent portions 4C are provided at positions different from the leeward side heat exchanging portion 1a.

  The leeward heat exchange unit 1b is provided on the downstream side of the leeward heat exchange unit 1a with respect to the flow direction of the fluid (room air) flowing between the corrugated fins 6. That is, it is provided to face the fan 12.

  Moreover, the leeward side heat exchange part 1b is provided so that the side part 4b of the linear part 4S does not become horizontal with the ground in the normal installation state of the indoor unit 10. In the straight part 4S located on the upper front side of the fan 12 with the smallest inclination in the leeward heat exchange part 1b, the center line 53 of the flat tube 4 is in relation to the horizontal line 51 when the indoor unit 10 is installed. It is provided so as to be inclined by 10 ° or more.

  In addition, the inclination angle of the linear portion 4S disposed above the fan 12 and behind the central axis of the fan 12 is larger than the inclination angle of the linear portion 4S disposed forward of the central axis of the fan 12. Is provided.

  Furthermore, the part arrange | positioned ahead of the fan 12 among the leeward side heat exchange parts 1b is comprised from the two linear parts 4S and one bending part 4C so that it may protrude ahead in a substantially square shape. Yes. The inclination angle of the straight line portion 4S that constitutes the substantially U-shaped protrusion is provided to be larger than the inclination angle of the straight line portion 4S located on the upper front side of the fan 12. In addition, the inclination angle of the lower straight portion 4S constituting the substantially U-shaped protrusion is the same as the inclination angle of the straight portion 4S at a position facing the windward heat exchange portion 1a.

  By comprising in this way, the effective area of a heat exchanger can be increased within the limited space.

  FIG. 8 is a refrigeration cycle diagram of a heat pump air conditioner including the heat exchanger 1 according to Embodiment 2 of the present invention.

  Depending on the conditions of the cooling operation, condensed water is generated in the flat tubes 4 and the corrugated fins 6 of the windward side heat exchange unit 1a and the leeward side heat exchange unit 1b.

  The condensed water generated in the windward heat exchange unit 1a falls when the flat tube 4 and the corrugated fin 6 are less than 10 ° from the horizontal. However, in the present embodiment, the condensed water that has fallen can be received by providing the flat tubes 4 and the corrugated fins 6 of the leeward side heat exchanging portion 1b with an inclination of 10 ° or more from the horizontal. Furthermore, the dew condensation water adhering to the leeward side heat exchanging portion 1b reaches the water receptacles 18a and 18b along the louver 25, the corrugated fin 6 and the flat tube 4 by gravity without staying on the spot. The condensed water that has reached the water receiver is led out of the indoor unit 10 and drained outside the room (not shown).

In this way, when the parallel flow heat exchanger is configured in two or more rows, at least the heat exchange portion provided in one row on the leeward side is arranged so that the inclination angle from the horizontal is 10 ° or more. Therefore, even if a part of the condensed water generated in the corrugated fins on the windward side or the flat tube falls, the water droplets that have fallen in the heat exchange part in the leeward row are received and stay in place. Without gravity, the water receivers 18a and 18b can be reached along the louver 25, the corrugated fins 6 and the flat tubes 4. For this reason, the freedom degree of design of the heat exchange part of an upwind row expands, and the heat exchange part of an upwind row can be enlarged more.

  In the second embodiment, the heat exchanger is described as having two rows, but three or more rows may be used.

  According to the present invention, in a parallel flow heat exchanger having corrugated fins, dead space can be suppressed and the effective area of the heat exchanger can be increased within the limited space, so that the limited space is effectively used. By using it, a heat exchanger unit with higher performance can be provided. For this reason, the heat exchanger of the present invention can be applied not only to home air conditioners but also to commercial air conditioners and the like.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 1a Upwind heat exchange part 1b Downward heat exchange part 2, 3 Header pipe 4 Flat tube 4a Flat part 4b Side part 4C Bending part 4S Straight part 5 Refrigerant passage 6 Corrugated fin 6a Outermost corrugated fin 7 Side plate 8, 9 Bending type 10 Indoor unit 10a Front opening 10b Top opening 11 Front panel 12 Fan 13 Air outlet 14 Vertical airflow direction changing blade 16 Filter 17a Filter frame 18a, 18b Water tray 19 Lower blade 20 Upper blade 21 Ventilation path 22 Rear guider DESCRIPTION OF SYMBOLS 23 Stabilizer 24 Side wall 25 Louver 26 Casing 31 Compressor 32 Four-way valve 33 Outdoor heat exchanger 34 Throttle device 36 Accumulator 38 Outdoor fan 41 Display unit 42 Outdoor unit 43 Liquid side connection pipe 44 Gas side connection pipe

Claims (3)

A plurality of flat tubes, and corrugated fins provided between the plurality of flat tubes,
The flat tube has a straight portion in which the flat portion is linear, and a bent portion bent in the horizontal direction of the flat portion, and the side portion of the straight portion is not provided horizontally. Heat exchanger. A plurality of flat tubes, and corrugated fins provided between the plurality of flat tubes,
The flat tube is provided in parallel to the flow direction of the fluid flowing between the corrugated fins, and at least the most downstream flat tube has a straight portion in which the flat portion is straight and a horizontal portion of the flat portion. A heat exchanger, wherein the side portion of the straight portion is not provided horizontally. 3. The heat exchanger according to claim 1, wherein a side surface of the straight line portion is provided with an inclination of 10 ° or more from the horizontal.