JP6340583B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger using a flat tube.

  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 when a parallel flow heat exchanger with corrugated fins is used, in order to arrange the heat exchanger in a limited space, a plurality of substantially flat plate heat exchangers are connected so as to surround the cross flow fan. It was stored in a casing (see, for example, Patent Document 1).

  FIG. 12 is a heat exchanger described in Patent Document 1. The heat exchanger 60 includes a first stage portion 65 disposed in front of a cross flow fan (not shown) and a second stage portion 66 disposed rearward in the cross section of the indoor unit of the air conditioner. ing. The first step portion 65 and the second step portion 66 include flat tubes 61 and fins (not shown) that are alternately stacked, and each flat tube 61 is connected to headers 63 and 64. And the 1st step part 65 and the 2nd step part 66 are the arrangement | positioning faced by the top | upper surface of the indoor unit.

JP 2003-214724 A

  However, in the conventional heat exchanger, since the first stage portion 65 and the second stage portion 66 are in abutment with the top surface, the headers 63 on the top side are adjacent to each other. Due to the configuration of the heat exchanger, the width of the header is wider than the width of the flat tube, and therefore there is a portion where the flat tube is not provided at a location where the header is adjacent. Moreover, since the location where a header adjoins obstructs that a wind passes a heat exchanger, it becomes a water stop area. For this reason, it had the subject of deteriorating heat exchange performance or blowing performance.

  An object of the present invention is to eliminate adjacent portions between headers and improve heat exchange performance and air blowing performance.

In order to solve the conventional problem, a heat exchanger according to the present invention includes a plurality of flat tubes and fins provided between the plurality of flat tubes, and the flat tubes include a first heat transfer. Part, a second heat transfer part provided with a longitudinal direction inclined with respect to the longitudinal direction of the first heat transfer part, and the first heat transfer part and the second heat transfer part. is composed of a connecting portion provided between, in the heat exchanger top surface section is formed of only a plurality of the connecting portions, the flat portion of the inside of the connecting portion, the first heat transfer The fin provided in either the part or the second heat transfer part is in contact.

  ADVANTAGE OF THE INVENTION According to this invention, a dead space can be suppressed and the heat exchange performance and ventilation performance can be improved by increasing the effective area of a heat exchanger within the limited space.

The longitudinal cross-sectional view of the indoor unit provided with the heat exchanger of Embodiment 1 of this invention The longitudinal cross-sectional view of the flat tube of the heat exchanger of Embodiment 1 of this invention The principal part expansion perspective view of the heat exchanger of Embodiment 1 of this invention Explanatory drawing which shows the procedure of the bending process of the flat tube of Embodiment 1 of this invention Explanatory drawing which shows the procedure of the modification of the bending process of the flat tube of Embodiment 1 of this invention. The principal part expansion perspective view of the heat exchanger of the modification of Embodiment 1 of this invention. Longitudinal sectional view of indoor unit for comparison Refrigeration cycle diagram of an air conditioner including the heat exchanger according to Embodiment 1 of the present invention The longitudinal cross-sectional view of the indoor unit provided with the heat exchanger of Embodiment 2 of this invention The principal part expansion perspective view of the heat exchanger of Embodiment 2 of this invention Longitudinal sectional view of indoor unit for comparison Vertical section of a conventional heat exchanger

A first invention includes a plurality of flat tubes and fins provided between the plurality of flat tubes, wherein the flat tubes include a first heat transfer portion and a longitudinal direction of the first heat transfer. a second heat transfer portion disposed to be inclined relative to the longitudinal direction of the section, is composed of a connecting portion provided between the second heat transfer portion and the first heat transfer portion in the heat exchanger top surface section is formed of only a plurality of the connecting portions, the flat portion of the inside of the connecting portion is in either of the first heat transfer portion or the second heat transfer portion The heat exchanger is characterized in that the provided fins are in contact with each other. According to this, since it is not necessary to arrange a header on the top surface portion of the heat exchanger, the water stop area generated by the header can be reduced, and the heat exchange performance and the air blowing performance can be improved.

  According to a second invention, in the first invention, the first heat transfer section, the connecting section, and the second heat transfer section are formed by bending a single flat tube. According to this, a heat exchanger can be manufactured with a simple manufacturing facility.

  In a third aspect based on the first aspect, the flat tubes are provided in a plurality of rows in the air flow direction. According to this, the freedom degree of the flow-path structure of the refrigerant | coolant which flows through the inside of a heat exchanger increases, and heat exchanger performance can be improved.

  Below, the heat exchanger 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 longitudinal sectional view of an indoor unit of an air conditioner including a heat exchanger according to Embodiment 1 of the present invention.

  The indoor unit 40 includes a casing 41 that forms an outer shell, and includes the heat exchanger 1 therein. The casing 41 is provided with a front opening 41 a located on the front side of the heat exchanger 1 and an upper surface opening 41 b located on the upper surface side of the heat exchanger 1.

  The front opening 41a is provided with a movable front panel (hereinafter simply referred to as a front panel) 42 that can be opened and closed. The front panel 42 closes the front opening 41a when the air conditioner is stopped, whereas the front panel 42 moves away from the casing 41 to open the front opening 41a when the air conditioner is in operation (front face 41a). The state in which the opening 41a is opened is not shown).

  The indoor unit 40 includes a cross-flow fan (hereinafter simply referred to as a fan) 2 for exchanging the indoor air taken in from the front opening 41a and the upper opening 41b with the heat exchanger 1 and blowing the air into the room. And an air outlet 43 that blows out the heat-exchanged air into the room. The air outlet 43 is provided with an up / down air direction changing blade 44 that opens and closes an opening and changes the air blowing direction up and down, and a left and right air direction changing blade 45 that changes the air blowing direction left and right.

  The upper and lower airflow direction changing blades 44 are a lower blade 44b that opens and closes the air outlet 43, and an upper blade that is provided above the lower blade 44b and controls the blowing direction of air blown from the air outlet 43 in cooperation with the lower blade 44b. 44a. The upper blade 44a and the lower blade 44b are connected to a drive shaft (not shown), and each drive shaft (not shown) is connected to a drive source (not shown) such as a drive motor.

  When the air conditioner starts operation, the up / down airflow direction changing blade 44 is controlled to open, the air outlet 43 is opened, and the fan 2 is driven, so that the indoor air passes through the front opening 41a and the upper opening 41b. It is taken into the indoor unit 40. The taken-in room air exchanges heat with the heat exchanger 1, passes through the fan 2, passes through the ventilation path 46 formed on the downstream side of the fan 2, and is blown out from the outlet 43.

  The air blowing direction from the air outlet 43 is controlled by the up / down air direction changing blade 44 and the left / right air direction changing blade 45, and the up / down direction angle of the up / down air direction changing blade 44 and the left / right direction angle of the left / right air direction changing blade 45 are It is controlled by a remote control (remote operation device) that controls the indoor unit 40.

  Furthermore, the ventilation path 46 located on the upstream side of the air outlet 43 includes a rear guider 47 located on the downstream side of the fan 2, a stabilizer 48 located on the downstream side of the fan 2 and facing the rear guider 47, and left and right side walls (see FIG. (Not shown).

  The term “stabilizer” described above is located in the vicinity of the downstream of the fan 2 and stabilizes the vortex generated in the vicinity of the front of the fan 2, and is located on the downstream side of the stabilizer and is conveyed by the fan 2. 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.

  Further, the indoor unit 40 is configured to remove dust contained in the indoor air taken from the front opening 41a and the upper surface opening 41b between the front opening 41a and the upper surface opening 41b and the heat exchanger 1. The filter 49 is provided. The filter 49 is attached to a filter frame 49 a provided in the casing 41.

  Moreover, the casing 41 is provided with water receiving trays 50a and 50b for receiving and draining dew condensation water from the heat exchanger 1. The water tray 50 a is provided on the front side from the stabilizer 48, and the water tray 50 b is provided on the back side from the upper end of the rear guider 47.

  Here, the heat exchanger 1 will be described in detail. FIG. 2 is a longitudinal sectional view of a flat tube of the heat exchanger 1, and FIG. 3 is an enlarged perspective view of a main part of the heat exchanger 1 in which a portion B of FIG. 1 is enlarged. FIG. 4 is an enlarged perspective view of a main part of the heat exchanger 1 in a modification of the first embodiment. In FIG. 3, only a part of the plurality of flat tubes is illustrated, and the fins are omitted in the middle. In FIG. 4, only a part of the plurality of flat tubes is illustrated, and all the fins are omitted.

  As shown in FIGS. 1 and 3, the heat exchanger 1 is provided between a plurality of flat tubes 4, headers 6 provided at both ends in the longitudinal direction of the flat tubes 4, and the plurality of flat tubes 4. And a fin 5 which is a corrugated thin plate. A so-called corrugated fin can be used as the fin 5. The fin 5 may be louvered.

  As shown in FIG. 2, the flat tube 4 is an elongated flat plate heat transfer tube having a plurality of small-diameter refrigerant passages 4 a therein, and has an outer surface that includes two flat portions 4 b facing each other and two surfaces. It is comprised from the two side parts 4c which connect the flat part 4b.

  As shown in FIG. 3, the flat tube 4 is bent at two locations so that one side of the flat portion 4b, which is the wide surface of the flat tube 4, faces each other and is parallel by bending process described later. It is bent at the portion 12. And the side parts 4c which are the surfaces where the width | variety of the flat tube 4 is narrow are not parallel but have an angle on the boundary of the two bending parts 12. FIG.

  That is, one flat tube 4 includes a first heat transfer unit 10 whose longitudinal direction is inclined with respect to the ground, and a connecting unit that is continuous via the first heat transfer unit 10 and the bent unit 12. 13 and a second heat transfer section 11 that is continuous with the connecting section 13 and another bent section 12.

  The first heat transfer unit 10 and the second heat transfer unit 11 are provided in parallel with an interval equal to the width of the connecting portion 13. The longitudinal direction of the second heat transfer unit 11 is inclined with respect to the longitudinal direction of the first heat transfer unit 10. That is, the flat part 4b of the first heat transfer part 10 is parallel to the flat part 4b of the second heat transfer part 11, and the side part 4c of the first heat transfer part 10 is the second heat transfer part. 11 side portions 4c are inclined with respect to each other.

  Here, the bending process of the flat tube 4 will be described in detail with reference to FIGS. 4 and 5. FIG. 4 is an explanatory diagram showing a procedure of bending a flat tube, and FIG. 5 is an explanatory diagram showing a procedure of a modified example of the bending of the flat tube.

  The flat tube 4 is an elongated molded product obtained by extruding a metal. In order to provide the bent portion 12 in the heat exchanger 1, the bending die 15 is brought into contact with the flat portion 4 b of the flat tube 4. At this time, as shown in FIG. 4A, the bending die 15 is brought into contact so that the longitudinal direction of the flat tube 4 and the linear portion of the bending die 15 are orthogonal to each other. Then, one end of the flat tube 4 is fixed and held by a fixing jig (not shown), and the other end is pressed toward the bending die 15 while being clamped by a bending drive unit (not shown) of the bending device. Thereby, the flat tube 4 can be bent at a substantially right angle (see FIG. 4B).

  Furthermore, as shown in FIG.4 (c), the length corresponding to the width | variety of the connection part 13 is shifted, the bending die 15 is moved in parallel, and another part is bent similarly. Thereby, the flat tube 4 becomes a substantially hairpin shape. Thereafter, in a state where the portion corresponding to the connecting portion 13 is held, the portion corresponding to the first heat transfer portion 10 is bent backward, and the portion corresponding to the second heat transfer portion 11 is bent forward, One heat transfer tube is formed in which the longitudinal directions of the first heat transfer unit 10 and the second heat transfer unit 11 intersect at an angle.

  In the bending process described above, a predetermined R may be provided in the straight part of the bending die 15 so that the bent part 12 of the flat tube 4 is slightly rounded.

  Alternatively, bending may be performed by the following method. As shown in FIG. 5A, the bending die 15 is brought into contact so that the short direction of the flat tube 4 and the straight portion of the bending die 15 form an angle. Then, one end of the flat tube 4 is fixed and held by a fixing jig (not shown), and the other end is pressed toward the bending die 15 while being clamped by a bending drive unit (not shown) of the bending device. As a result, bending can be performed with an angle formed between the portion corresponding to the connecting portion 13 and the longitudinal direction of the flat tube 4 (see FIG. 5B).

  Further, the length corresponding to the width of the connecting portion 13 is shifted, the bending die 15 is translated, and another portion is bent in the same manner. As a result, one heat transfer tube is formed in which the longitudinal directions of the first heat transfer section 10 and the second heat transfer section 11 intersect at an angle.

  Note that when the flat tube 4 is bent so as to form an angle with the short direction as described above, the flat portion 4b of the connecting portion 13 becomes a substantially parallelogram. The flat portion 4b may be deformed so as to be substantially square by post-processing. In this case, as shown in FIG. 1, the side part 4c of the connection part 13 can be arranged linearly. Alternatively, the flat portion 4b may be a substantially parallelogram. In this case, as shown in FIG. 6, if the side portion 4c of the connecting portion 13 is shifted in the front-rear direction, the flat portion 4b of the first heat transfer portion 10 and the second heat transfer portion 11 is used as the header. 6 can be provided perpendicular to the longitudinal direction. According to this, since the flat tubes 4 of the first heat transfer unit 10 and the second heat transfer unit 11 can be arranged in parallel to the air flow passing through the heat exchanger 1 with a simple configuration, The air blowing performance of the heat exchanger 1 is not lowered.

  The flat tubes 4 bent as described above are stacked so as to overlap in the vicinity of the connecting portion 13 between the first heat transfer section 10 and the second heat transfer section 11, and the heat transfer tube of the heat exchanger 1 is configured. . Headers 6 as collecting tubes are provided at both ends of the heat transfer tubes. The refrigerant passage 4 a of the flat tube 4 communicates with the inside of the header 6. In addition, a first fin 5 a is provided between the flat portion 4 b outside the first heat transfer unit 10 and the flat portion 4 b inside the adjacent first heat transfer unit 10. Further, the second fin 5 b is also provided between the flat part 4 b outside the second heat transfer part 11 and the flat part 4 b inside the adjacent second heat transfer part 11. For this reason, the widths of the fins 5 (the first fin 5a and the second fin 5b) are substantially matched with the width of the connecting portion 13.

  Refrigerant flowing through the refrigerant passage 4a in the flat tube 4 constituting the connecting portion 13 when either the first fin 5a or the second fin 5b is brought into contact with the flat portion 4b inside the connecting portion 13 It is desirable to promote heat transfer between the air and the air passing through the heat exchanger 1.

  A side plate (not shown) is arranged on the outer surface of the outermost flat tube 4 or the side surface of the fin 5 positioned on the outermost side. The header 6, the flat tube 4, the fin 5, and the header 6 are all made of a metal having good heat conductivity such as aluminum. The flat tube 4 is fixed to the header 6 and the fins 5 are fixed to the flat tube 4 by brazing or welding.

  The heat exchanger 1 is configured so that the longitudinal direction of the header 6 is parallel to the width direction of the indoor unit 40, and the flat portion 4 b of the flat tube 4 is parallel to the depth direction of the indoor unit 40. Is provided. In the heat exchanger 1, the header 6 is disposed above the water trays 50 a and 50 b, respectively, and the bent flat tube 4 is disposed so as to surround the fan 2.

  The connection part 13 is provided in parallel with the ground in the normal installation state of the indoor unit 40. The connecting portion 13 is disposed above the fan 2, the first heat transfer section 10 is disposed on the upper rear side of the fan 2, and the second heat transfer section 11 is disposed on the upper front side of the fan 2.

  In the heat exchanger 1, the lower part of the portion where the heat transfer tube is configured from the second heat transfer unit 11 is formed in an arc shape so as to substantially follow the outer periphery of the fan 2. This arc-shaped portion is formed by bending the flat tube 4, the fin 5, the header 6, etc. by brazing or the like and then bending the flat portion 4 b in the horizontal direction.

  The angle formed by the central axis in the longitudinal direction of the first heat transfer unit 10 and the central axis in the longitudinal direction of the linear portion of the second heat transfer unit 11 is 60 to 100 °. It is desirable for the condensed water generated in the above to be guided to the water receiving trays 50a and 50b along the flat tube 4.

  Here, the case where a header is provided between the 1st heat-transfer part 10 and the 2nd heat-transfer part 11 is demonstrated using FIG. 7 for the comparison with this Embodiment. FIG. 7 is a longitudinal sectional view of an indoor unit provided with a heat exchanger described for comparison with the present embodiment shown in FIG.

  As shown in FIG. 7, in the cross section of the indoor unit of the air conditioner, when the heat exchanger 71 is arranged before and after the fan 2, the header 76 above the rear heat exchanging portion 72 and the front heat exchanging portion. The header 77 above 73 is disposed adjacent to the top surface. In order to configure the heat exchanger 71, it is necessary to make the widths of the headers 76 and 77 larger than the width of the flat tube 74. Therefore, the length of the header 76 and the header 77 in the front-rear direction (in FIG. 7) D) is relatively large. For this reason, the water stop area which becomes ventilation obstruction | occlusion will be born under the headers 76 and 77.

  However, according to the present embodiment, the top surface portion of the heat exchanger 1 is only provided with the connecting portion 13 configured by bending the flat tube 4, and the length of the connecting portion 13 in the front-rear direction ( Since A) in FIG. 1 is shorter than the length of the header 76 and the header 77 in the front-rear direction (D in FIG. 7), the water stop area generated by the headers 76 and 77 can be reduced.

  Further, the connecting portion 13 is configured only by bending the flat tube 4, and the internal refrigerant passage 4 a is the same as the refrigerant passage 4 a of the first heat transfer portion 10 and the second heat transfer portion 11. The pressure loss of the refrigerant can be reduced as compared with the case where the headers 76 and 77 are provided in which the flow path area is rapidly expanded or contracted.

  As described above, the heat exchanger 1 according to the embodiment of the present invention can improve the heat exchange performance and the air blowing performance.

  Next, the operation when the indoor unit 40 including the heat exchanger 1 configured as described above is mounted on an air conditioner to perform an air conditioning operation will be described. FIG. 8 is a refrigeration cycle diagram of an air conditioner including the heat exchanger 1 of the first embodiment.

  This air conditioner is a so-called separator type air conditioner in which an indoor unit and an outdoor unit are connected to each other by a refrigerant pipe and a control wiring, and a heat pump is configured by the indoor unit and the outdoor unit. The indoor unit 40 of Embodiment 1 is a wall-mounted indoor unit that is attached to a wall surface in the room.

  The configuration of the air conditioner will be described. Compressor 81 for compressing refrigerant, four-way valve 82 for switching the refrigerant circuit during cooling / heating operation, outdoor heat exchanger 83 for exchanging heat of the outside air with the refrigerant that becomes a condenser during cooling and serves as an evaporator during heating, outdoor heat exchanger 83, an outdoor fan 88 that promotes heat exchange between the refrigerant flowing in the air and the outside air, a throttling device 84 that depressurizes the refrigerant, heat exchanger 1 that exchanges heat between the refrigerant and the indoor air and serves as an evaporator during cooling and a condenser during heating, The fan 2 that promotes heat exchange between the refrigerant flowing in the heat exchanger 1 and the room air, and an accumulator 86 provided on the suction side of the compressor 81 are provided.

  The outdoor unit 92 includes a compressor 81, a four-way valve 82, an outdoor heat exchanger 83, an expansion device 84, an accumulator 86, and an outdoor fan 88, and is connected to the indoor unit 40 by a liquid side connection pipe 93 and a gas side connection pipe 94. 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 81 becomes a high-temperature and high-pressure refrigerant and is sent to the outdoor heat exchanger 83 through the four-way valve 82. Then, the outdoor fan 88 promotes heat exchange with the outside air to dissipate the heat, and the high-pressure liquid refrigerant is sent to the expansion device 84. In the expansion device 84, 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 93.

  The indoor air sucked by the fan 2 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 2 to cool the room. At this time, depending on the operating conditions, condensed water is generated in the flat tubes 4 and the fins 5 of the heat exchanger 1.

  However, in the present embodiment, since the flat tubes 4 and the fins 5 are inclined, the condensed water reaches the water trays 50a and 50b along the flat tubes 4 and the fins 5 by gravity without remaining on the spot. To do. The condensed water reaching the water trays 50a and 50b is led out of the indoor unit 40 and drained outside the room.

  Further, the gas refrigerant passes through the gas side connection pipe 94 and enters the four-way valve 82, and returns to the compressor 81 through the accumulator 86.

  On the other hand, during the heating operation, the refrigerant compressed by the compressor 81 becomes a high-temperature and high-pressure refrigerant, passes through the four-way valve 82, and is sent to the gas side connection pipe 94. The indoor air sucked in by the fan 2 exchanges heat with the refrigerant through the heat exchanger 1, and the refrigerant dissipates heat to the indoor air and condenses to become 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 2 in a state where the temperature is raised, thereby heating the room. Thereafter, the refrigerant is sent to the expansion device 84 through the liquid side connection pipe 93, and is reduced in pressure by the expansion device 84 to become a low-temperature and low-pressure two-phase refrigerant, and is sent to the outdoor heat exchanger 83, and the outdoor fan 88 Heat exchange is promoted to evaporate, and the vapor is returned to the compressor 81 through the accumulator 86 through the four-way valve 82.

  The air conditioner equipped with the heat exchanger 1 of the present embodiment in the indoor unit can improve the cooling and heating performance by the high heat exchange performance and the air blowing performance of the heat exchanger 1, and can reduce the power consumption cost. It becomes possible to suppress.

(Embodiment 2)
FIG. 9 is a longitudinal sectional view of an indoor unit of an air conditioner including a heat exchanger according to Embodiment 2 of the present invention. FIG. 9 also schematically shows the refrigerant pipe connected to the heat exchanger. FIG. 10 is an enlarged perspective view of a main part of the heat exchanger 1 in which the E part in FIG. 9 is enlarged. In the second embodiment, differences from the first embodiment will be mainly described, and description of parts common to the first embodiment will be omitted.

  As shown in FIGS. 9 and 10, the heat exchanger 21 of the second embodiment is different from the heat exchanger 1 of the first embodiment in that flat tubes are provided in two rows with respect to the air flow direction. It is a point. The heat exchanger 21 includes a first heat exchange unit 22 and a second heat exchange unit 23. The first heat exchanging part 22 and the second heat exchanging part 23 are bent at bending parts 29 and 30, respectively. The 1st heat exchange part 22 and the 2nd heat exchange part 23 are arrange | positioned in the form shifted | deviated to the front and back.

  One flat tube 400 constituting the first heat exchange unit 22 includes a first heat transfer unit 100 provided with a longitudinal direction inclined with respect to the ground, the first heat transfer unit 100, and a bent portion. 29, and a second heat transfer section 110 that is continuous with the connection section 130 via another bent portion 29. The longitudinal direction of the second heat transfer section 110 is the first The heat transfer section 100 is provided to be inclined with respect to the longitudinal direction.

  In addition, one flat tube 401 constituting the second heat exchanging unit 23 includes a first heat transfer unit 101 provided with a longitudinal direction inclined with respect to the ground, the first heat transfer unit 101, and A connecting portion 131 that is continuous via the bent portion 30 and a second heat transfer portion 111 that is continuous via the connecting portion 131 and another bent portion 30 are provided, and the longitudinal direction of the second heat transfer portion 111 is: The first heat transfer unit 101 is provided to be inclined with respect to the longitudinal direction.

  In the first heat exchange unit 22, headers as collecting tubes are provided at both ends of the flat tube 400. Further, a first fin 51 a is provided between the first heat transfer unit 100 and the first heat transfer unit 100 of the adjacent flat tube 400. A second fin 51 b is provided between the second heat transfer unit 110 and the second heat transfer unit 110 of the adjacent flat tube 400.

  In the second heat exchange section 23, headers as collecting tubes are provided at both ends of the flat tube 401. In addition, a first fin 52 a is provided between the first heat transfer unit 101 and the first heat transfer unit 101 of the adjacent flat tube 401. A second fin 52 b is provided between the second heat transfer unit 111 and the second heat transfer unit 111 of the adjacent flat tube 401.

  The connection part 131 of the second heat exchange part 23 has the same width as the connection part 130 of the first heat exchange part 22. The inclination angle of the first heat transfer section 101 of the second heat exchange section 23 is substantially the same as the inclination angle of the first heat transfer section 100 of the first heat exchange section 22, and the second heat exchange section. The inclination angle of the second heat transfer unit 111 of 23 is substantially the same as the inclination angle of the second heat transfer unit 110 of the first heat exchange unit 22.

  The first fins 51 a of the first heat exchange unit 22 are provided so as to be in contact with the connecting portion 130, and the first fins 52 a of the second heat exchange unit 23 are provided so as to be in contact with the connecting portion 131. On the other hand, the second fin 51b of the first heat exchange unit 22 and the second fin 52b of the second heat exchange unit 23 are in contact with or close to the first fin 52a of the second heat exchange unit 23. It is provided to do.

  Alternatively, the second fins 51b of the first heat exchanging part 22 are provided so as to contact the connecting part 130, the second fins 52b of the second heat exchanging part 23 are provided so as to contact the connecting part 131, and the first The first fins 51a of the second heat exchange unit 22 and the first fins 52a of the second heat exchange unit 23 are provided so as to be in contact with or close to the second fins 51b of the first heat exchange unit 22. May be.

  On the upper front side with respect to the fan 2, the first heat exchange unit 22 is on the windward side, and the second heat exchange unit 23 is on the leeward side. On the other hand, on the upper back side, the first heat exchange unit 22 is on the leeward side, and the second heat exchange unit 23 is on the leeward side.

  As in this embodiment, by providing flat tubes in multiple rows, not only can the heat exchange area be increased, but also heat exchange performance and ventilation performance are improved compared to the case where a header is provided on the top surface. The effect to make becomes large. This will be described with reference to FIG. FIG. 11 is a longitudinal sectional view of an indoor unit provided with a heat exchanger described for comparison with the present embodiment shown in FIG.

  As shown in FIG. 11, in the cross section of the indoor unit of the air conditioner, headers 761 and 771 above the first heat exchange unit 22 and headers 762 and 772 above the second heat exchange unit 23 are It becomes the arrangement which adjoins on the surface. The length in the front-rear direction combined with these headers (G in FIG. 11) is relatively large. For this reason, the water stop area which becomes ventilation obstruction | occlusion will be born under the headers 761, 771, 762 and 772.

  However, according to the present embodiment, the top surface portions of the first heat exchange unit 22 and the second heat exchange unit 23 are provided with the connection units 130 and 131 configured by bending the flat tubes 400 and 401. The length in the front-rear direction (F in FIG. 9) that combines the connecting portion 130 and the connecting portion 131 is the length in the front-rear direction that combines the headers 761, 771, 762, and 772 (in FIG. 11). Since it is shorter than G), the water stop area caused by the header can be reduced.

  In addition, as shown in FIG. 9, when the air conditioner is in a cooling operation by configuring the refrigerant flow path with two flow paths, for example, the refrigerant inflow path 25 and the refrigerant outflow path 26, respectively, The refrigerant can flow into the heat exchanger on the windward side, which contributes to improvement of the heat exchanger performance.

  In the present embodiment, the connecting portion 130 of the first heat exchanging portion 22 and the connecting portion 131 of the second heat exchanging portion 23 are provided so as to be in contact with each other. A predetermined gap may be provided between the connection part 130 of the heat exchange part 22 and the connection part 131 of the second heat exchange part 23. According to this, when there is a temperature difference between the refrigerant flowing through the connecting portion 130 and the refrigerant flowing through the connecting portion 131, heat is exchanged between the first heat exchanging portion 22 and the second heat exchanging portion 23. And the heat exchange performance can be further improved.

  As described above, the heat exchanger of the present invention can improve heat exchange performance and air blowing performance, and can improve energy saving performance of an air conditioner to which the heat exchanger is applied. 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.

1, 21, 60, 71 Heat exchanger 2 Fan 4, 61, 74, 400, 401 Flat tube 4a Refrigerant passage 4b Flat part 4c Side part 5 Fin 5a, 51a, 52a First fin 5b, 51b, 52b Second Fins 6, 63, 64, 76, 77, 761, 762, 771, 772 Header 10, 100, 101 First heat transfer part 11, 110, 111 Second heat transfer part 12, 29, 30 Bending part 13 , 130, 131 Connecting portion 15 Bending die 22 First heat exchanging portion 23 Second heat exchanging portion 25 Refrigerant inflow passage 26 Refrigerant outflow passage 40 Indoor unit 41 Casing 41a Front opening portion 41b Upper surface opening portion 42 Front panel 43 Air outlet 44 Upper and lower wind direction change blades 44a Upper blade 44b Lower blade 45 Left and right wind direction change blades 46 Ventilation path 47 Rear guider 48 Stabilizer 49 49a Filter frame 50a, 50b Water tray 65 First stage portion 66 Second stage portion 81 Compressor 82 Four-way valve 83 Outdoor heat exchanger 84 Throttle device 86 Accumulator 88 Outdoor fan 92 Outdoor unit 93 Liquid side connection tube 94 Gas side connection tube

Claims (3)

A plurality of flat tubes and fins provided between the plurality of flat tubes, wherein the flat tubes have a first heat transfer portion and a longitudinal direction relative to a longitudinal direction of the first heat transfer portion. a second heat transfer portion disposed inclined Te, is composed of a connecting portion provided between the second heat transfer portion and the first heat transfer portion, a plurality heavens surface portion In the heat exchanger formed of only the connecting portion, a fin provided in either the first heat transfer portion or the second heat transfer portion contacts the flat portion inside the connecting portion. A heat exchanger characterized by 2. The heat exchanger according to claim 1, wherein the first heat transfer unit, the connection unit, and the second heat transfer unit are formed by bending a single flat tube. The heat exchanger according to claim 1, wherein the flat tubes are provided in a plurality of rows with respect to an air flow direction.