JP6157217B2 - Flat tube heat exchanger, outdoor unit of air conditioner equipped with the same, and method of manufacturing flat tube heat exchanger - Google Patents

Description

  The present invention relates to a flat tube heat exchanger, an outdoor unit of an air conditioner including the flat tube heat exchanger, and a method for manufacturing a flat tube heat exchanger.

As a shape of the heat transfer tube, there is known a fin tube type heat exchanger including a tube having a circular cross section, a flat tube having a rectangular cross section and a rectangular shape. Here, a heat exchanger using a circular tube is referred to as a “circular tube heat exchanger”, and a heat exchanger using a flat tube is referred to as a “flat tube heat exchanger”.
And the manufacturing method of a flat tube heat exchanger is known in which a U-shaped slit is formed in the width direction from one end of the fin, and the flat tube is press-fitted into the slit (see, for example, Patent Document 1). ).

Here, in both the circular tube heat exchanger and the flat tube heat exchanger, the heat transfer tubes and the heat transfer tubes are connected so that the positional relationship between the heat transfer tubes connected to the fins is staggered (hereinafter also referred to as “staggered arrangement”). By configuring the fins, the heat transfer performance of the heat exchanger can be improved.
In the case of a circular tube heat exchanger, a plurality of rows of fins manufactured by a fin press can be stacked, and then circular tubes can be inserted to manufacture a staggered arrangement.

  On the other hand, in the case of a flat tube heat exchanger, there is a manufacturing method in which flat tubes are inserted in a plurality of rows after laminating fins formed so that U-shaped slits connecting the flat tubes are in a staggered arrangement. (For example, patent document 2). In the case of a flat tube heat exchanger, there is a manufacturing method in which flat tubes are not inserted into a plurality of rows integrally, but the flat tubes are inserted into the fins one by one (see, for example, Patent Document 3).

  In heat exchangers, a flat tube (hereinafter also referred to as “hairpin tube”) obtained by bending a single heat transfer tube into a U shape is often used as the heat transfer tube. A plurality of rows of heat exchangers manufactured by aligning the directions of the hairpin tubes have different bending radii at the time of bending, so the position of the U-shaped bent portion (hereinafter also referred to as “hairpin portion”) is shifted and bent. Do.

JP-A-5-172482 (see, for example, FIG. 1) Japanese Patent No. 4300508 (see, for example, FIG. 1) Japanese Patent No. 4845943 (for example, see FIG. 2)

  A flat tube heat exchanger, such as the techniques described in Patent Documents 1 to 3, manufactures a plurality of heat exchange portions obtained by inserting a flat tube into fins formed with notches, and includes a plurality of the manufactured heat exchangers. A plurality of rows of flat tube heat exchangers are manufactured by overlapping the rows.

  In such a plurality of flat tube heat exchangers, when the positional relationship of the flat tubes is a staggered arrangement, the positions of the upper and lower end portions of the fins of the heat exchange portions of each row are not aligned (the fins The upper and lower ends are not aligned), and there is a problem that a projecting portion is generated and the space for mounting in an outdoor unit or the like of the air conditioner increases unnecessarily.

  In addition, if the upper and lower end portions of the fins of the heat exchange sections in each row are aligned, a problem arises that the heat transfer performance is a grid-like arrangement lower than the staggered arrangement (hereinafter also referred to as “cross-cut arrangement”). was there.

  The following method is also conceivable in order to achieve a staggered arrangement and align the end portions of the fins. That is, two heat exchange parts having the same shape are used, one heat exchange part is rotated 180 degrees clockwise or counterclockwise, and the heat exchange part is superposed on the other heat exchange part. However, in this method, the position of the hairpin portion of the hairpin tube of one heat exchange portion is on the right side, but the position of the hairpin portion of the hairpin tube of the other heat exchange portion is on the left side, and the pipe connection is There was a problem of becoming complicated.

  Therefore, in order to obtain a flat tube heat exchanger that achieves a staggered arrangement of flat tubes, aligns the upper and lower end sides of the fins, and aligns the positions of the hairpin portions of the hairpin tubes, It was necessary to prepare two types of molds, and there were problems such as an increase in manufacturing cost for producing the mold and a burden required for exchanging the mold with a press machine.

  The present invention has been made to solve at least one of the above-described problems. The flat tubes are arranged in a staggered arrangement without manufacturing two types of molds for forming the fins, and the fins. It aims at providing the manufacturing method of the flat tube heat exchanger which implement | achieves aligning the up-and-down end part side, the outdoor unit of an air conditioning apparatus provided with the same, and a flat tube heat exchanger.

The flat tube heat exchanger according to the present invention includes a plurality of flat fins in which a plurality of notches are formed at a constant pitch, a straight portion having a flat cross section attached to the notches of the fins, and straight portions on both end sides. In a flat tube heat exchanger configured by stacking a plurality of rows of heat exchange parts having a heat transfer pipe having a bent part that is connected and bent, the fins are close to one end of the fins. When the length from the other end of the fin to the notch close to the other end is the second length, the first length is different from the second length. Are formed so that the total length of the first length and the second length is the length of the notch pitch, and one end of the fin is connected to one heat exchanging portion of the adjacent row. The other heat exchange part of the adjacent row is arranged so as to be on the lower side. The other end of the emission are arranged to come to the lower side, and is one of the heat exchange portion and the other of the heat exchange unit, so that the bent portion of one of the heat exchange portion, and the bent portion of the other heat exchange portion aligned Are arranged .

  Since the flat tube heat exchanger according to the present invention has the above-described configuration, the flat tubes are arranged in a staggered arrangement and the upper and lower sides of the fins are manufactured without manufacturing two types of molds for forming the fins. Alignment of the end side can be realized.

(A) is the outdoor unit of the air conditioning apparatus having the heat exchanger according to Embodiment 1 of the present invention, and (b) is the front panel, left side panel, and right side panel blower of the outdoor unit shown in (a). It is a perspective view of the state where a fan guard etc. were removed. It is a vertical sectional view in a state where an odd-numbered row heat exchanger and an even-numbered row heat exchanger are combined in the flat tube heat exchanger according to Embodiment 1 of the present invention. It is a figure explaining the formation position etc. of the notch of a fin. It is explanatory drawing of an odd number row heat exchanger and an even number row heat exchanger. It is a top view in the manufacturing process of the fin of the flat tube heat exchanger which concerns on this Embodiment 1 of this invention. It is explanatory drawing of the state which connected the flat tube to the fin of the flat tube heat exchanger which concerns on Embodiment 1 of this invention. It is explanatory drawing of the state after carrying out the overlapping bending process of the odd number row heat exchanger and the even number row heat exchanger of the flat tube heat exchanger which concerns on Embodiment 1 of this invention. It is a comparative example of a flat tube heat exchanger. It is a comparison table of heat transfer performance by a combination of an odd-numbered row heat exchanger and an even-numbered row heat exchanger. It is explanatory drawing of the manufacturing method of the flat tube heat exchanger which concerns on Embodiment 2. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1A is an outdoor unit 200 of an air conditioner having a flat tube heat exchanger 100 according to Embodiment 1 of the present invention, and FIG. 1B is a front panel of the outdoor unit 200 shown in FIG. 51 is a perspective view of a state in which the side panel 52, the blower, the fan guard 54, and the like are removed. The first embodiment will be described with reference to the drawings.
In the flat tube heat exchanger 100 according to the first embodiment, the flat tubes 1 are arranged in a staggered arrangement without manufacturing two types of molds forming the fins 2, and the upper and lower end sides of the fins 2 are arranged. Improvements that can be aligned are added.

[Description of configuration of outdoor unit 200]
The outdoor unit 200 has, for example, a vertically long outline. That is, as shown in FIG. 1, the outdoor unit 200 includes a front panel 51 that constitutes a front side shell of the outdoor unit 200, a fan guard 54 provided on the top of the outdoor unit 200, and a side shell of the outdoor unit 200. The side panel 52 which comprises this. The outdoor unit 200 is provided with an air suction port 59 for taking in air into the side and back of the outer shell, and an air outlet 55 for exhausting air to the outside at the upper part of the outdoor unit 200. That is, the outdoor unit 200 is formed in the side panel 52 and formed in the air inlet 59 used to take air into the outdoor unit 200 and the fan guard 54, and the air in the outdoor unit 200 is transferred to the outdoor unit 200. It has an air outlet 55 that is used for discharge to the outside.

The outdoor unit 200 includes a flat tube heat exchanger 100, a base panel 56 that supports the flat tube heat exchanger 100 and the like, a compressor 57 that compresses and discharges refrigerant, and an accumulator 58 that stores excess refrigerant. It is what you are doing.
The flat tube heat exchanger 100 exchanges heat between the refrigerant supplied to itself and the air passing through the flat tube heat exchanger 100. The flat tube heat exchanger 100 functions as a condenser (radiator) during cooling operation to condense and liquefy the refrigerant, and functions as an evaporator during heating operation to evaporate and evaporate the refrigerant. The flat tube heat exchanger 100 is provided at a position facing the side panel 52, and is fixed to the side panel 52, for example.
Here, in this Embodiment 1, although the flat tube heat exchanger 100 is demonstrated as what was laminated | stacked three steps in the up-down direction, it is not limited to it, It is the aspect which is not laminated | stacked, Also good.

  The base panel 56 supports the flat tube heat exchanger 100, the compressor 57, the accumulator 58, and the like, and these are, for example, screwed. The base panel 56 constitutes an outer shell on the bottom surface side of the outdoor unit 200. The compressor 57 is installed on the base panel 56, for example, and compresses and discharges the refrigerant. The compressor 57 is connected to the accumulator 58 on the suction side. Further, the discharge side of the compressor 57 is connected to the flat tube heat exchanger 100 during the cooling operation, and is connected to a use-side heat exchanger mounted in an indoor unit (not shown) during the heating operation. The accumulator 58 is connected to the suction side of the compressor 57 and stores liquid refrigerant. A flat tube heat exchanger 100 is erected on the rear side, right side, and left side of the accumulator 58.

  In addition, the outdoor unit 200 is equipped with a fan (not shown) that is used to take air into and out of the outdoor unit 200. The fan is exposed when the fan guard 54 is removed, and rotates to take in air into the outdoor unit 200 and exhaust the air out of the outdoor unit 200. Thus, the fan is provided so as to be surrounded by the fan guard 54, and the air outlet 55 is formed on the upper side of the fan. That is, the air that has passed through the flat tube heat exchanger 100 arranged along the air suction port 59 is sucked into the outdoor unit 200 and exhausted from the air outlet 55 formed in the upper part of the outer shell through the fan. Is done.

[Detailed configuration of flat tube heat exchanger 100]
FIG. 2 is a vertical sectional view of the flat tube heat exchanger 100 according to Embodiment 1 in which the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 are combined. FIG. 3 is a view for explaining the formation position and the like of the notch 3 of the fin 2. FIG. 4 is an explanatory diagram of the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102. 4A is a longitudinal sectional view of the odd-numbered row heat exchanger 101, and FIG. 4B is a longitudinal sectional view of the even-numbered row heat exchanger 102. With reference to FIGS. 2-4, the detailed structure of the flat tube heat exchanger 100 is demonstrated.
The flat tube heat exchanger 100 includes an odd-numbered row heat exchanger 101 on the upper side of the paper and an even-numbered heat exchanger 102 on the lower side of the paper. Here, each of the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 has a configuration corresponding to the heat exchange unit. That is, in the flat tube heat exchanger 100, odd-numbered row heat exchangers 101 that are heat exchange units and even-numbered row heat exchangers 102 that are heat exchange units are alternately arranged.
In the first embodiment, the flat tube heat exchanger 100 includes a single row (single row) of odd-numbered heat exchangers 101 and a single row (single row) of even-numbered heat exchangers 102 in total. However, the present invention is not limited thereto, and may be three or more rows.
Here, the row direction corresponds to the direction of the X axis shown in FIG. 2 and corresponds to the air flow direction passing through the fins 2. Further, the step direction is the Z-axis direction shown in FIG. 2 and corresponds to the longitudinal direction of the fin 2.

(About flat tube 1 and fin 2)
As shown in FIG. 2, the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 have a flat tube 1 that is a heat transfer tube and plate-like fins 2. The flat tube 1 has at least one flow path 1a in which a heat exchange medium flows.
The flat tube 1 includes a first straight part 6A inserted into the notch 3 of the fin 2 and a hairpin part 6a connected to the first straight part 6A and having a U-shaped cross-section that is flat. The first straight portion 6A is connected to the hairpin portion 6a on the side to which the first straight portion 6A is not connected, and the second straight portion 6B is inserted into the notch 3 of the fin 2 (see FIG. 6). The first straight portion 6A and the second straight portion 6B have a flat cross section perpendicular to the longitudinal direction. Of the first straight part 6A and the second straight part 6B, a joint part 6b to which a header pipe (not shown) is connected is connected to the end opposite to the side to which the hairpin part 6a is connected. Is provided.
In FIG. 2, an example in which six channels 1 a are formed in one flat tube 1 is described, but the number is not limited to six. Moreover, as a heat exchange medium which flows through the flow path 1a, fluid, such as water, a refrigerant | coolant, a brine, is used, for example.

The rectangular shape of the cross-sectional shape of the flat tube 1 has a preset aspect ratio. The flat tube 1 is composed of a hollow metal tube having good thermal conductivity such as aluminum or copper. As shown in FIG. 2, the flat tube 1 is inserted into the notch 3 of the fin 2 and provided in a plurality of stages (in the Z-axis direction in FIG. 2).
In addition, in this Embodiment 1, although the case where the flat tube 1 which has the hairpin part 6a whose cross-sectional shape is flat shape is used as a pipe | tube inserted in the fin 2, it demonstrates as an example, It is not limited to it. . For example, instead of the hairpin portion 6a whose cross-sectional shape is a flat shape, a flat tube 1 having a vent tube whose circular cross-sectional shape may be used.

  A plurality of notches 3 into which the flat tube 1 is inserted are formed in the fin 2. A plurality of the notches 3 are formed at a constant pitch along the longitudinal direction of the fin 2. As shown in FIG. 3, the fin 2 has a cross-sectional shape that is a rectangle rounded. That is, the fin 2 has a plurality of fin ends having dimensions set in advance. More specifically, the fin 2 includes a fin end 2 a on one end side in the longitudinal direction of the fin 2, a fin end 2 b on the other end side in the longitudinal direction of the fin 2, and a fin end on one end side in the short side direction of the fin 2. 2 c and fin ends 2 a 1, 2 a 2, 2 d on the other end side in the short direction of the fin 2.

  The fin end 2 a is a portion located on one end side in the longitudinal direction of the fin 2. The fin end 2a is located on the left side of the drawing in the example of the fin 2 of the odd-numbered heat exchanger 101 shown in FIG. 2 and the fin 2 shown in FIG. The fin end 2a is provided so as to be orthogonal to the direction in which the plurality of notches 3 are formed, the fin end 2a1, and the fin end 2c. The fin end 2 b is a portion located on the other end side in the longitudinal direction of the fin 2. In the example of the fins 2 of the even-numbered heat exchanger 102 shown in FIG. 2, the fins 2 are located on the right end side of the drawing. The fin end 2b is provided so as to be orthogonal to the forming direction of the plurality of notches 3, the fin end 2a2, and the fin end 2c.

The fin end 2c is a fin end provided on the side opposite to the portion where the notch 3 is formed. The fin end 2c of the even-numbered heat exchanger 102 is provided so as to face the fin end 2a1, the fin end 2a2, and the fin end 2d of the odd-numbered heat exchanger 101. Although not shown, in the case of three or more rows, the fin ends 2c of the odd-numbered heat exchanger 101 face the fin ends 2a1, fin ends 2a2, and fin ends 2d of the even-numbered heat exchanger 102. Provided.
The fin end 2d is a portion where the notch 3 is formed. The fin end 2 d has a length corresponding to the pitch of the adjacent notches 3. For example, when three notches 3 are formed in the fin 2, two fin ends 2d are formed.

The fin end 2a1 is located between one fin end 2a in the direction in which the plurality of notches 3 are formed, that is, in a direction parallel to the longitudinal direction of the fin 2, and the notch 3 on the most fin end 2a side of the notches 3. Is the length of the part. The fin end 2a1 is orthogonal to the fin end 2a, parallel to the fin end 2c, and provided at a position on the same straight line as the fin end 2a2 and the fin end 2d.
The fin end 2a2 is located between the other fin end 2b in the direction in which the plurality of cutouts 3 are formed, that is, in the direction parallel to the longitudinal direction of the fins 2, and the cutout 3 on the most other fin end 2b side of the cutouts 3. Is the length of the part. The fin end 2a2 is orthogonal to the fin end 2b, parallel to the fin end 2c, and provided at a position on the same straight line as the fin end 2a1 and the fin end 2d.
The length of the fin end 2a1 of the flat tube heat exchanger 100 is different from the length of the fin end 2a2. That is, the notches 3 are formed in the fins 2 at a constant pitch in the plurality of fins 2, but the lengths of the fin ends 2a1 and the fin ends 2a2 are different, and the left and right are asymmetrical. That's what it means.

Here, the pitch Dp (step pitch Dp) at which the notch 3 is formed corresponds to the length to the center of the flat tube 1. At this time, if the length from one end of the fin 2 to the notch 3 close to the one end is the first length, the first length corresponds to k × Dp, and the other end of the fin 2 The second length corresponds to (1−k) × Dp, where the length to the notch 3 adjacent to the second length is the second length.
More specifically, the length from the fin end 2a to the width center of the notch 3 of the flat tube 1 closest to the fin end 2a in the odd-numbered heat exchanger 101 corresponds to k × Dp. Moreover, the length from the fin end 2b to the width center of the notch 3 of the flat tube 1 closest to the fin end 2b in the even-numbered heat exchanger 102 corresponds to (1-k) × Dp. Note that one of the length k × Dp and the length (1-k) × Dp corresponds to the first length, and the other corresponds to the second length.

  Note that k, which is a coefficient of Dp, is 0 <k <0.5 or 0.5 <k <1. That is, the fin 2 of the flat tube heat exchanger 100 includes (1) a condition that the first length and the second length are different, and (2) a length that is a combination of the first length and the second length. The notch 3 is formed based on the condition that the length corresponds to the pitch Dp of the notch 3. Thereby, when the odd-numbered row heat exchanger 101 and the even-numbered row heat exchanger 102 are overlapped, the upper end and the lower end are aligned, and the positional relationship of the flat tubes 1 can be arranged in a staggered arrangement. It has become.

In the above description, the notch 3 is formed based on the condition that (2) the total length of the first length and the second length is a length corresponding to the pitch Dp of the notch 3. However, it is not limited to this. For example, if the even-numbered heat exchanger 102 is in a range where the even-numbered heat exchanger 102 is not located on the same straight line of the flat tube 1 of the odd-numbered heat exchanger 101, the combined length of the first length and the second length is notch 3. It may deviate from the length corresponding to the pitch Dp. Also in this case, it becomes a staggered arrangement in which the flat tubes 1 of the even-numbered heat exchanger 102 are positioned between the flat tubes 1 of the odd-numbered heat exchanger 101.
However, (2) if the total length of the first length and the second length is a length corresponding to the pitch Dp of the notch 3, the space between the adjacent flat tubes 1 in the odd-numbered heat exchanger 101 Since the flat tube 1 of the even-numbered heat exchanger 102 comes at the center position, the pressure loss can be reduced and the heat exchange efficiency can be improved with higher efficiency.

(Notch 3 and slit 4)
The notches 3 are formed at a constant pitch (equal intervals) in the longitudinal direction of the fins 2. As a result of the plurality of notches 3 being formed, the fins 2 have fin ends 2a1, fin ends 2a2, and fin ends 2d. Is formed.
One flat tube 1 is inserted into one notch 3. Thus, by inserting the flat tubes 1 into the notches 3, the flat tubes 1 are arranged in the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 by the number of the notches 3 in the step direction. The flat tube 1 inserted into the notch 3 is integrally joined to the fin 2 by brazing, for example.
As shown in FIGS. 2 to 4, the fin 2 is formed with a slit 4 that functions as a heat receiving portion or a heat radiating portion in addition to the notch 3. The slit 4 may be formed by, for example, cutting and raising, an uneven shape or the like. Since the flat tube heat exchanger 100 has the slit 4 as shown in FIG. 4, the heat transfer coefficient outside the tube is improved. This is because the slits 4 of the fins 2 are cut and raised in opposite directions by the odd-numbered row heat exchanger 101 and the even-numbered row heat exchanger 102, so that the fluid (for example, air) supplied to the flat tube heat exchanger 100 This is because the heat exchange between the heat exchange medium flowing through the flat tube 1 and the fluid is promoted.

(Arrangement of fins 2)
The odd row heat exchanger 101 and the even row heat exchanger 102 of the flat tube heat exchanger 100 have the fins 2 formed in the same shape, but the odd row heat exchanger 101 and the even row heat exchanger. The arrangement of the fins 2 in a state in which 102 is installed in the outdoor unit 200 is different. This will be described next.

  The odd-numbered heat exchanger 101 is arranged so that the fin end 2a is on the left side of the drawing sheet shown in FIG. 2, and the even-numbered heat exchanger 102 is arranged so that the fin end 2b is on the left side of the drawing page shown in FIG. Be placed. For this reason, although not shown in FIG. 2, the odd-numbered heat exchanger 101 is arranged so that the fin ends 2b are on the right side of the paper surface shown in FIG. The end 2a is arranged so as to be on the right side of the sheet shown in FIG.

  As described above, the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 are overlapped so as to face each other. Specifically, the odd-numbered row heat exchanger 101 that is one heat exchanging portion of the adjacent row is arranged so that one fin end 2a is on the lower side, and is the other heat exchanging portion of the adjacent row. This means that the even-numbered heat exchanger 102 is arranged so that the other fin end 2b is on the lower side. In addition, the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 are different from the fins 2 of the even-numbered heat exchanger 102 in which the fins 2 of the odd-numbered heat exchanger 101 are the other heat exchanging units of the adjacent rows. Of these, the fin ends 2a1, 2a2, 2d on the side where the notch 3 is formed are overlaid so as to face the fin end 2c on the opposite side.

  On the contrary, the odd-numbered row heat exchanger 101 which is one heat exchanging portion of the adjacent row is arranged so that one fin end 2b is on the lower side, and is the other heat exchanging portion of the adjacent row. The even-numbered heat exchanger 102 may be arranged such that the other fin end 2a is on the lower side.

Further, as shown in FIG. 4, the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 have the slits 4 of the odd-numbered heat exchanger 101 and the slits 4 of the even-numbered heat exchanger 102 formed opposite to each other. It is something that is overlaid.
That is, as shown in FIG. 4A, the slits 4 of the odd-numbered heat exchanger 101 are formed so as to protrude to the right side of the fins 2 with the fins 2 as a boundary. As shown in FIG. 4, the slit 4 of the even-numbered heat exchanger 102 is formed so as to protrude to the left side of the fin 2 with the fin 2 as a boundary. Thus, since the slit 4 is formed on the opposite side, the flow of air flowing through the flat tube heat exchanger 100 is disturbed, and heat transfer is promoted.

[Production method]
FIG. 5 is a top view in the manufacturing process of the fin 2 of the flat tube heat exchanger 100 according to the first embodiment. FIG. 6 is an explanatory diagram of a state in which the flat tubes 1 are connected to the fins 2 of the flat tube heat exchanger 100 according to the first embodiment. FIG. 7 is an explanatory diagram of a state after the odd-numbered row heat exchanger 101 and the even-numbered row heat exchanger 102 of the flat tube heat exchanger 100 according to Embodiment 1 are bent and overlapped.
6A is a diagram related to the odd-numbered row heat exchanger 101, and FIG. 6B is a diagram related to the even-numbered row heat exchanger 102. FIG. 7A is a side view of the flat tube heat exchanger 100 after bending, and FIG. 7B is a top view of the flat tube heat exchanger 100 after bending. is there. With reference to FIGS. 5-7, the manufacturing method of the flat tube heat exchanger 100 is demonstrated.

  The fin 2 is manufactured by feeding the material continuously in the short side direction of the fin 2 and press-molding it using the circular burring holes 5 outside the both ends. That is, the fin 2 is press-molded with a fin mold having a preset shape to obtain the fin 2 in which the notch 3 and the slit 4 are formed. Thus, in manufacturing the flat tube heat exchanger 100 in which the positional relationship of the flat tubes 1 is a staggered arrangement, the fin ends 2a1 and the fins on one end side and the other end side of the fins 2 are provided. There is no need to prepare two types of fin molds having different lengths of the end 2a2.

A plurality of fins 2 produced by press molding are laminated. Next, the fin 2 is used as a boundary between the fin 2 of the odd-numbered heat exchanger 101 that is one of the heat exchangers in the adjacent row and the fin 2 of the even-numbered heat exchanger 102 that is the other heat exchanger. Then, the flat tube 1 is inserted so that the position of the hairpin portion 6a is reversed. More details are as follows.
As shown in FIG. 6A, the odd-numbered heat exchanger 101 is press-fitted and inserted into the fins 2 in which a plurality of flat tubes 1 are laminated in the + Y direction. Moreover, as shown in FIG.6 (b), it inserts and inserts into the fin 2 which laminated | stacked the flat tube 1 in the even row heat exchanger 102 toward the -Y direction. However, in the state of FIG. 6A and FIG. 6B, the positional relationship between the fins 2 of the odd-numbered heat exchanger 101 and the fins 2 of the even-numbered heat exchanger 102 is the same.
Note that the method of press-fitting the flat tubes 1 in the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 into the fins 2 is not limited to this.
About the odd-numbered heat exchanger 101, the positional relationship of the fins 2 is the same, the flat tube 1 is installed so that the hairpin portion 6a is on the right side of the page, the hairpin portion 6a of the flat tube 1, and the first straight portion 6A. The second straight portion 6B and the joint portion 6b may be simultaneously press-fitted into the fin 2 and inserted. For the even-numbered heat exchanger 102, the positional relationship of the fins 2 is the same, the flat tube 1 is installed so that the hairpin portion 6a is on the left side of the page, the hairpin portion 6a of the flat tube 1, and the first straight portion 6A. The second straight portion 6B and the joint portion 6b may be simultaneously press-fitted into the fin 2 and inserted. The insertion direction in this case corresponds to the + X direction in FIGS.

Then, from the state shown in FIG. 6 (a), within the same plane as the paper surface of FIG. 6 (a) so that the left-right position of the odd-numbered heat exchanger 101 is reversed and the vertical position is reversed. Then, the odd-numbered heat exchanger 101 is rotated 180 degrees clockwise or counterclockwise. When the rotated one is overlapped and bent on the even-numbered heat exchanger 102 shown in FIG. 6B, the position of the flat tube 1 of the odd-numbered heat exchanger 101 as shown in FIG. The flat tube heat exchanger 100 in which the position of the hairpin portion 6a of the flat tube 1 of the even-numbered heat exchanger 102 is the same right end can be manufactured.
That is, the flat tube heat exchanger 100 is manufactured by combining the odd-numbered row heat exchanger 101 and the even-numbered row heat exchanger 102 having different insertion directions of the flat tube 1 so that the directions of the hairpin portions 6a are aligned as described above. To do. Thereby, flat tube heat exchange which realizes arranging the flat tubes 1 in a staggered arrangement, preventing the lower end side and the upper end side of the fins 2 from being uneven, and aligning the position of the hairpin portion 6a of the flat tube 1 is achieved. That is, the vessel 100 can be obtained.
Further, the flat tube heat exchanger 100 manufactured in this way includes a side where the slits 4 of the odd-numbered heat exchanger 101 are cut and raised, and a side where the slits 4 of the even-numbered heat exchanger 102 are cut and raised. Are reversed so that the odd-numbered row heat exchanger 101 and the even-numbered row heat exchanger 102 are superposed, and heat exchange between the heat exchange medium flowing through the flat tube 1 and the fluid is promoted. Yes.

After manufacturing what is shown in FIG. 6, next, as shown in FIG. 7, the flat tube heat exchanger 100 having a U-shaped horizontal cross-section is manufactured by bending at two locations. And what laminated | stacked three this flat tube heat exchangers 100 is installed in the base panel 56 of the outdoor unit 200 (refer FIG. 1).
In addition, although the flat tube heat exchanger 100 whose horizontal cross-sectional shape becomes a U-shape was demonstrated, it is not limited to it. For example, the horizontal cross-sectional shape may be L-shaped. Moreover, it is good also as a heat exchanger arrange | positioned in the V shape using two flat tube heat exchangers 100 which comprised the odd-numbered row heat exchanger 101 and the even-numbered row heat exchanger 102 on each other. Further, the flat tube heat exchanger 100 may not be bent.

[Comparative example]
FIG. 8 is a comparative example of the flat tube heat exchanger 100 ′. Referring to FIG. 8, flat tube 1 is not in a staggered arrangement when odd row heat exchanger 101 ′ and even row heat exchanger 102 ′ are combined (FIG. 8A), and odd row heat A description will be given of the fact that the upper end side and the lower end side of the fins 2 ′ are not uniform between the exchanger 101 ′ and the even-numbered heat exchanger 102 ′ (FIG. 8B).
Note that “′” added to the following symbols is added for the sake of convenience in order to distinguish the first embodiment from the comparative example.

As shown in FIG. 8A, when the odd-numbered heat exchanger 101 ′ and the even-numbered heat exchanger 102 ′ are combined with the end sides of the fins 2 ′ aligned, the flat tubes of the odd-numbered heat exchanger 101 ′ are combined. It can be seen that 1 ′ and the flat tubes 1 ′ of the even-numbered heat exchanger 102 ′ are arranged on the same straight line parallel to the vertical direction of the paper surface of FIG. In such a flat tube heat exchanger 100 ′, the heat transfer performance is reduced because the flat tubes 1 ′ are not in a staggered arrangement.
Further, as shown in FIG. 8 (b), odd-numbered heat exchange is performed so that the flat tubes 1 ′ of the odd-numbered heat exchanger 101 ′ and the flat tubes 1 ′ of the even-numbered heat exchanger 102 ′ are in a staggered arrangement. When the condenser 101 ′ and the even-numbered heat exchanger 102 ′ are combined, the end portions of the fins 2 ′ are not aligned. In such a flat tube heat exchanger 100 ′, the mounting space for the flat tube heat exchanger 100 ′ when the flat tube heat exchanger 100 ′ is mounted on the outdoor unit 200 ′ because the ends of the fins 2 ′ are not aligned. Will increase.

Although not shown in FIG. 8, two odd-numbered heat exchangers 101 ′ are used or even-numbered heat exchangers are used in order to make a staggered arrangement and align the end portions of the fins 2 ′. A method using two 102 ′ is conceivable.
When two odd-numbered heat exchangers 101 ′ are used, one odd-numbered heat exchanger 101 ′ is rotated 180 degrees clockwise or counterclockwise as described above, and the other odd-numbered heat exchanger 101 ′ is rotated. Overlay on 101 '. However, in this case, the position of the hairpin portion 6a ′ of the flat tube 1 ′ is reversed on the left and right, and the connection of the piping becomes complicated.
The same applies when two even-numbered heat exchangers 102 ′ are used.

[Effects of flat tube heat exchanger 100 according to Embodiment 1]
Since the flat tube heat exchanger 100 according to the first embodiment includes the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102, the flat tubes 1 are arranged in a staggered arrangement, and the lower end side of the fins 2 In addition, it is possible to prevent the upper end side from being uneven, and to align the position of the hairpin portion 6a of the flat tube 1.
In the outdoor unit 200 on which the flat tube heat exchanger 100 is mounted, three flat tube heat exchangers 100 are stacked, but the lower end side and the upper end side of the fins 2 are not irregular. Therefore, the flat tube heat exchanger 100 can be more easily stacked, and the space mounted on the outdoor unit 200 can be prevented from being bulky.

Since the shape of the fin 2 is the same shape, the flat tube heat exchanger 100 which concerns on this Embodiment 1 becomes one kind of fin metal mold | die, equipment cost can be reduced, and it is not necessary to exchange a fin metal mold | die. Therefore, the manufacturing time is shortened and the manufacturing cost is reduced.
When manufacturing with a plurality of fin presses, when manufacturing by dividing into odd-numbered molds and even-numbered molds, the required number of odd-numbered heat exchangers 101 and even-numbered heat exchangers 102 is not the same, A situation occurs when the device is not operating. However, in the flat tube heat exchanger 100 according to the first embodiment, since it is not necessary to exchange fin molds, the operation time of the apparatus is long with a plurality of units, and the heat exchanger is easy to make a production balance.

  FIG. 9 is a comparison table of heat transfer performance by a combination of the odd-numbered row heat exchanger 101 and the even-numbered row heat exchanger 102. Since the flat tube heat exchanger 100 according to the first embodiment is a combination of the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102, the odd-numbered heat exchanger 101 is combined. As a result, the extra-tube transmission efficiency is improved.

Embodiment 2. FIG.
FIG. 10 is an explanatory diagram of a method for manufacturing the flat tube heat exchanger 100 according to the second embodiment. In the second embodiment, parts different from the first embodiment will be described.
In Embodiment 2, fins 2 arranged in parallel so as to be orthogonal to the flat tube 1 are inserted into the flat tubes 1 arranged in parallel, and the odd-numbered heat exchanger 101 and the even-numbered heat exchanger 102 are connected. It is manufactured. Thus, instead of inserting the flat tube 1 into the fin 2, the fin 2 may be inserted into the flat tube 1 as in the second embodiment.
Further, when inserting the fins 2 into the flat tube 1, the fins 2 may be inserted one by one, or a plurality of fins 2 may be inserted into the flat tube 1 at the same time.

[Effects of flat tube heat exchanger 100 according to Embodiment 2]
The flat tube heat exchanger 100 according to the second embodiment has the same effect as the flat tube heat exchanger 100 according to the first embodiment.

  1 flat tube, 1a flow path, 2 fin, 2a fin end, 2a1 fin end, 2a2 fin end, 2b fin end, 2c fin end, 2d fin end, 3 notch, 4 slit, 5 circular burring hole, 6A 1st Straight part, 6B Second straight part, 6a Hairpin part (U-shaped part), 6b Joint part, 51 Front panel, 52 Side panel, 54 Fan guard, 55 Air outlet, 56 Base panel, 57 Compressor, 58 Accumulator 59, air inlet, 100 flat tube heat exchanger, 101 odd-numbered heat exchanger, 102 even-numbered heat exchanger, 200 outdoor unit.

Claims (7)

A plurality of flat fins in which a plurality of notches are formed at a constant pitch, a straight section having a flat cross section attached to the notches of the fin, and the straight sections are connected to both ends, and subjected to bending. In a flat tube heat exchanger configured by superimposing a plurality of rows of heat exchange portions each having a heat transfer tube having a bent portion ,
The fin includes
When the length from one end of the fin to the notch close to the one end is a first length, and the length from the other end of the fin to the notch close to the other end is a second length,
The first length and the second length are formed to be different from each other, and the total length of the first length and the second length is the length of the pitch of the notches. A notch is formed,
The heat exchange part in one of the adjacent rows is
It is arranged so that one end of the fin is on the lower side,
The heat exchange part of the other of the adjacent rows is
It is arranged so that the other end of the fin comes to the lower side ,
One heat exchange part and the other heat exchange part are:
The flat tube heat exchanger is arranged such that the bent portion of one of the heat exchange portions and the bent portion of the other heat exchange portion are aligned . The fin includes
A plurality of slits formed by cutting and raising the fins are formed,
One heat exchange part and the other heat exchange part are:
The side where the slit of the one heat exchanging part is cut and raised and the side where the slit of the other heat exchanging part is cut and raised are reversed. The flat tube heat exchanger according to claim 1 . An outdoor unit for an air conditioner comprising the flat tube heat exchanger according to claim 1 or 2 . A plurality of flat fins in which a plurality of notches are formed at a constant pitch, a straight section having a flat cross section attached to the notches of the fin, and the straight sections are connected to both ends, and subjected to bending. In a flat tube heat exchanger configured by superimposing a plurality of rows of heat exchange portions each having a heat transfer tube having a bent portion ,
When the length from one end of the fin to the notch close to the one end is a first length, and the length from the other end of the fin to the notch close to the other end is a second length, The first length and the second length are formed to be different from each other, and the total length of the first length and the second length is the length of the pitch of the notches. A fin forming step of forming a plurality of notches at a constant pitch;
A heat exchanging part manufacturing step of fixing a part of the notch of the fin and the linear part of the heat transfer tube to manufacture a plurality of heat exchanging parts;
Arrange one heat exchange part of the adjacent row so that one end of the fin is on the lower side, and arrange the other heat exchange part of the adjacent row on the other side of the fin. A heat exchanging portion superposing step of arranging and superposing one heat exchanging portion of the adjacent row and the other heat exchanging portion;
I have a,
The heat exchange part manufacturing step includes:
Producing one of the heat exchanging parts and the other heat exchanging part so that the position of the bent part is reversed across the plurality of fins,
In the heat exchange unit overlapping step,
One of the heat exchanging parts and the other heat exchanging part of the adjacent row are rotated so that the positions of the bent parts are aligned, and the one heat exchanging part and the other heat exchanging part are rotated. A method of manufacturing a flat tube heat exchanger, wherein the portions are overlapped with each other . In the heat exchange part manufacturing step,
The fin is inserted into the heat transfer tube to produce one heat exchange part and the other heat exchange part.
The manufacturing method of the flat tube heat exchanger of Claim 4 characterized by the above-mentioned. In the heat exchange part manufacturing step,
The heat transfer tube is inserted into the fin to produce one heat exchange part and the other heat exchange part.
The manufacturing method of the flat tube heat exchanger of Claim 4 characterized by the above-mentioned. In the fin forming step,
Cut and raise the surface of the fin to form a plurality of slits,
In the heat exchange unit overlapping step,
The one heat exchange part and the other so that the side of the heat exchange part where the slit is raised and the side of the other heat exchange part where the slit is raised are reversed. The method for manufacturing a flat tube heat exchanger according to any one of claims 4 to 6 , wherein the heat exchanging part is superposed.

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