JP2997817B2 - Heat exchanger - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used for, for example, a condenser of a room cooler, an evaporator, and the like.

2. Description of the Related Art Conventionally, in a heat exchanger for a room cooler, a flat tube made of an extruded aluminum material having a number of refrigerant passages is bent in a meandering shape, headers are attached to both ends of the meandering flat tube, respectively, and A serpentine type in which fins are interposed between straight pipe portions of a meandering flat pipe has been known.

However, in such a conventional serpentine-type heat exchanger, the meandering flat tube is made of one extruded member. For example, the depth of the heat exchanger is increased to improve the performance. If the (width) is to be increased, the shape of the flat tube must be newly designed and the manufacturing dies must be manufactured to make the flat tube, which not only reduces the productivity but also increases the manufacturing cost. There was a problem of being expensive.

Conventionally, in order to improve the flow of the refrigerant in the heat exchanger, if a partition wall is provided in the header, the flat tube becomes one piece.
However, there is a problem that the end of the flat tube inserted into the header is obstructed and it is difficult to form a partition wall.

An object of the present invention is to solve the above-mentioned problems of the prior art,
When increasing the depth (width) of the heat exchanger to improve its performance by using a plurality of heat exchanger units consisting of a meandering flat tube and members for header construction attached to both ends of the meandering flat tube In addition, there is no need to design a new flat tube shape or manufacture a die for manufacturing the flat tube, and therefore, it is excellent in productivity, the manufacturing cost is low, and the partition wall in the header, An object of the present invention is to provide a heat exchanger which can be provided very simply and reliably, whereby the flow of the refrigerant in the heat exchanger can be improved, and the heat exchange performance can be greatly improved.

Means for Solving the Problems In order to achieve the above object, first of the present invention,
The heat exchanger of the present invention includes at least two heat exchanger units, each of which includes a flat tube having a meandering shape as viewed from a plane and header forming members attached to both left and right ends thereof and stacked vertically. At the connection ends of the upper ends of the left and right header configuration members of the heat exchanger unit, large-diameter portions are respectively provided, and these large-diameter portions are provided at the lower ends of the header configuration members on the same side of the upper heat exchanger unit. The connection ends are fitted into each other, and the connection ends of the header forming members are connected to each other in a communicating manner, so that the first and second headers 2).
Is formed, a fluid introduction pipe is connected to one of the first headers, and a fluid discharge pipe is connected to the other second header.

Next, a heat exchanger according to a second aspect of the present invention comprises at least two heat exchanger units, each of which comprises a meandering flat tube viewed from a plane and header forming members attached to both left and right ends thereof, and which is vertically stacked. A partition wall is provided at the connection end of the lower end of the right header configuration member of the upper heat exchanger unit, and at the connection end of the upper end of the left and right header configuration members of the lower heat exchanger unit adjacent to the partition wall, Large diameter portions are provided, respectively, and the connection end portion of the lower end of the header configuration member on the same side of the upper heat exchanger unit is fitted into the large diameter portion of the connection end portion on the upper end of the left header configuration member of the lower heat exchanger unit. The first header is formed by connecting the connection end portions of the header constituent members to each other in a communication manner, and the upper heat exchanger unit of the upper heat exchanger unit is attached to the large diameter portion of the right header constituent member of the lower heat exchanger unit. Ipsilateral A second header having two header portions separated by a partition wall is formed by fitting and connecting the connection end portions of the lower ends of the header members, and the fluid is attached to one header portion of the second header. An inlet pipe is connected, and a fluid discharge pipe is connected to the other header portion of the second header.

A heat exchanger according to a third aspect of the present invention includes at least three heat exchanger units, each of which is composed of a meandering flat tube viewed from a plane and header forming members attached to both left and right ends thereof and stacked vertically. A connection end of a lower end of the header forming member on one side of the upper heat exchanger unit of the at least three heat exchanger units, and a connection end of a lower end of the header forming member on the other side of the intermediate heat exchanger unit With the department,
A partition wall is provided, and the partition wall is arranged so as to be alternately positioned at different levels on the left and right sides. The connection end portion at the upper end of the header configuration member of the intermediate heat exchanger unit and the header configuration of the lower unit are provided. Large diameter portions are provided at the connection end portions of the upper end of the member, respectively, and these large diameter portions are connected to the connection end portion of the lower end of the header forming member on the same side of the upper unit above and the intermediate heat exchanger. The connecting ends of the lower ends of the header forming members of the unit are fitted respectively, and the connecting ends of the header forming members are connected to each other and the connecting ends of the header forming members are connected to each other, so that they are separated by partition walls. First and second headers are formed, a fluid introduction pipe is connected to a header portion above the uppermost partition wall, and a fluid discharge pipe is connected to a header portion below the lowermost partition wall. That It is a symptom.

Usually, fins are interposed between the straight pipe portions of the meandering flat tubes of the heat exchanger, and the fins are commonly passed to the straight pipe portions of the plurality of meandering flat tubes. It may be a single long corrugated fin, a short corrugated fin divided and interposed in each straight pipe portion of each meandering flat tube, or a skive fin.

According to the heat exchanger, by using a plurality of heat exchanger units each including a meandering flat tube and members for forming a header attached to both ends of the meandering flat tube, the heat exchanger is improved for performance improvement. When the depth (width) of the heat exchanger unit is increased, the number of heat exchanger units may be increased, and it is not necessary to design a new flat tube shape or manufacture a die for manufacturing the flat tube. Therefore, it is excellent in productivity and low in manufacturing cost.

When a partition wall is provided in the header, for example, if a partition wall is provided between the header forming members of the adjacent heat exchanger units, the end of the flat tube becomes obstructive as in the related art. That is to say, the partition wall can be provided very simply and reliably, whereby the flow of the refrigerant in the heat exchanger can be improved, and the heat exchange performance can be greatly improved.

In the present invention, since the large-diameter portion is provided at the connection end of one of the header forming members and the connection end of the other header-forming member is directly inserted and connected, The connection between the connection ends of the members is very easy, the productivity is excellent, and the manufacturing cost is low.

Also, a large-diameter portion is provided at the connection end of one of the header forming members, and the connection end of the other header-forming member is inserted and connected as it is, so that the inner diameter of the header is the same over the entire length. Therefore, the cross-sectional area of the header member does not fluctuate at the connection portion between the upper and lower header member ends, the fluid flow is smooth at the connection portion, the flow path resistance does not increase, and the heat exchange performance is improved. It is excellent.

Next, an embodiment of the present invention will be described with reference to the drawings.

In this specification, upper and lower, left and right refer to FIG. 4, upper means upper side of FIG. 4, lower means lower side, and left means left side of the figure and right means right side of FIG. And

FIGS. 1 and 2 show a first embodiment in which the heat exchanger of the first invention according to the present invention is applied to a condenser of a room cooler. In FIGS. 1 and 2, a condenser according to the present invention is made of an extruded aluminum material having a number of refrigerant passages. Meandering flat tube (1)
And two upper and lower heat exchanger units (A) and (B) each comprising a header forming member (3) (4) attached to each of the left and right ends thereof.

The header forming members (3a), (3b), (4a), and (4b) of the upper and lower heat exchanger units (A) and (B) are respectively tubular and have closed walls (7a) at their upper and lower non-connection ends. (7a) (7b)
(7b) is provided.

Then, the member for header configuration of the lower unit (B) (3
b) (4b) Large-diameter portions (5) and (6) are respectively provided at the connection end portions at the upper end, and these large-diameter portions (5) and (6) have the same header configuration of the upper unit (A). Member (3a) (4a)
The connection ends of the lower ends are fitted respectively, and the connection ends of the header forming members (3a), (3b), (4a), and (4b) are connected to each other in a communicating manner, so that the first and second headers (11) are connected. )
(12) is formed.

A refrigerant introduction pipe (8) is connected to a portion of the first header (11) near the upper end of the side wall (11a), and a refrigerant discharge pipe (8) is connected to a portion of the second header (12) near the lower end of the side wall (12a). 9) is connected.

The heat exchanger units (A) are located between the straight pipe portions (1a) and (1a) of the meandering flat tubes (1) of the condenser.
A narrow corrugated fin (2) divided for each (B) is interposed. As the corrugated fin (2), two heat exchanger units (A) and (B)
One long corrugated fin commonly passed to the straight pipe portion (1a) of the meandering flat tube (1) may be used.

FIG. 3 shows a second embodiment of the first invention of the present invention. Here, the difference from the first embodiment is that the condenser is composed of three heat exchanger units (A).
(B) (C), all units (A)
(B) (3a) (3b), a header component on the same side as (C)
(3c), (4a), (4b), and (4c) are that the connection ends are connected in a communicating manner.

Here, the header forming members (3a), (3b), (4a), and (4b) of the units (A) and (B) at the upper and lower ends are respectively tubular and closed at the upper and lower non-connection ends. 7a) (7
a) Where the (7b) and (7b) are provided, the header forming members (3c) and (4c) of the intermediate heat exchanger unit (C)
Is simply cylindrical.

The connection end of the upper end of the header forming member (3c) (4c) of the intermediate heat exchanger unit (C) and the connection end of the upper end of the header forming member (3b) (4b) of the lower unit (B). Large-diameter portions (5) and (6) are provided, respectively, and these large-diameter portions (5) and (6) are provided on the same side of the header unit (3a) of the upper unit (A). (4a) The connection end of the lower end and the header-forming member (3c) of the intermediate heat exchanger unit (C) (4c) are fitted with the connection end of the lower end, respectively, and the header-forming member (3a) ( 3b) (3c) (4
a) The first and second headers (11) and (12) are formed by connecting the connection ends of (4b) and (4c) in a communicating manner.

Also, in the portion near the upper end of the side wall of the first header (11),
Other points such as the point where the refrigerant introduction pipe (8) is connected and the refrigerant discharge pipe (9) is connected to the lower end portion of the side wall of the second header (12) are the same as those of the first embodiment. Since this is the same as the case, the same components are denoted by the same reference numerals in the drawings.

In the capacitors of the first embodiment and the second embodiment,
The refrigerant introduced into the first header (11) from the refrigerant introduction pipe (8) is a two or three heat exchanger unit (A) (B)
Alternatively, the refrigerant flows through many refrigerant passages (2) of the meandering flat tube (1) of (C), reaches the second header (12), and is discharged from the refrigerant discharge tube (8) to the outside of the condenser.

Like the capacitors of the first and second embodiments,
By combining two or three heat exchanger units (A), (B) or (C), the depth (width) of the condenser can be increased to improve the heat exchange performance, and a new flat tube can be obtained. There is no need to design the shape of the capacitor or to manufacture a die for manufacturing the same, and therefore, the productivity is excellent and the manufacturing cost of the capacitor is low.

According to the condensers of the first and second embodiments, the meandering flat tube (1) has the heat exchanger unit (A).
(B) Since it is divided for each (C) and arranged in parallel, for example, as compared with a conventional condenser using one meandering flat tube as a whole, it has the same volume and the same number of refrigerant passages. In this case, the sectional area of each of the refrigerant passages of the divided meandering flat tube (1) is reduced, and the flow velocity of the refrigerant passing through each of the passages is increased, so that the condenser is placed in a so-called horizontal state. Even if there is, there is an advantage that the refrigerant does not accumulate in the refrigerant passage portion below the condenser.

The third embodiment shown in FIGS. 4 and 5 corresponds to the second embodiment of the present invention.
1 shows a capacitor according to the invention.

The difference between the condenser according to the second invention and the first embodiment of the first invention is that the upper heat exchanger unit (A) of the upper and lower heat exchanger units (A) and (B) is different.
A partition wall (10) is provided at the connection end of the lower end of the header forming member (3b) on the right side of the upper and lower units (A).
By connecting the connection ends of the left-side header forming members (3a) and (4a) of FIG.
While 1) is formed, both upper and lower units (A)
By connecting the connection ends of the right-side header forming members (3b) and (4b) of (B), a second header portion (12a) having two header portions (12a) and (12b) separated by a partition wall (10) is formed. 2
A refrigerant introduction pipe (8) is connected to a point where the header (12) is formed and to an upper end of the second header (12) in a direction in which the header (12) is extended, and to a lower end of the second header (12). The point is that the refrigerant discharge pipe (9) is connected in the direction of extending the header (12).

In the above, the second header (1
When the refrigerant is introduced into the header portion (12a) above the partition wall (10) of (2), the refrigerant flows into the refrigerant passage of the meandering flat tube (1) of the upper unit (A) separately. After passing through the refrigerant passage of the meandering flat tube (1), the refrigerant reaches the other first header (11), where the flow direction is changed downward, and the refrigerant flows through the first header (11). From the lower half, this time, it flows separately into the refrigerant passage of the meandering flat tube (1) of the lower unit (B). After passing through the refrigerant passage of the meandering flat tube (1), the refrigerant flows into the second header (1).
It reaches the inside of the header portion (12b) below the partition wall (10) of 2), and is discharged from the refrigerant discharge pipe (9) to the outside of the condenser.

The fourth embodiment shown in FIGS. 6 and 7 is the third embodiment of the present invention.
1 shows a capacitor according to the invention.

The difference between the condenser according to the third invention and the second embodiment of the first invention is that the upper heat exchanger unit (A) among the three heat exchanger units (A), (B), and (C). The connecting end of the lower end of the right header forming member (3b) and the connecting end of the lower end of the left header forming member (3c) of the intermediate heat exchanger unit (C) respectively have partition walls (1).
0) and (10), and the partition walls (10) and (10) are arranged so as to be located at different levels alternately on the left and right, and the header forming member () of the intermediate heat exchanger unit (C) is provided. 3c)
(4c) Large-diameter portions (5) and (6) are provided on the connection end portion at the upper end and the connection end portion at the upper end of the header forming members (3b) and (4b) of the lower unit (B), respectively. The large diameter portions (5) and (6) of the upper unit (A), the upper end of the upper unit (A), the connection ends of the lower ends of the header forming members (3a) and (4a) and the intermediate heat exchanger unit (C) The connection ends of the lower ends of the header forming members (3c) and (4c) are fitted respectively, and the connection ends of the header forming members (3a), (3b) and (3c) and the header forming member (4a) ( 4b) The first and second headers (11) divided by the partition walls (10) and (10), respectively, by connecting the connection ends of (4c).
(12) is formed.

Here, the partition walls (10) and (10) inside the first and second headers (11) and (12) are provided so as to be located at different levels alternately on the left and right sides.
2), header portions (11a), (11b), (12a), and (12b) separated by the partition walls (10) and (10) are formed, respectively, and the header portion (12a) above the upper partition wall (10) is formed. )
Is connected to a refrigerant introduction pipe (8), and a refrigerant discharge pipe (9) is connected to a header portion (11b) below the lower partition wall (10).

According to the condenser of the fourth embodiment, the refrigerant introduced from the refrigerant introduction pipe (8) to the header portion (12a) above the upper partition wall (10) of the second header (12) is supplied to the upper unit (A). ) Into the refrigerant passage of the meandering flat tube (1). After passing through the refrigerant passage of the meandering flat tube (1), the refrigerant reaches the inside of the header portion (11a) above the partition wall (10) of the other first header (11). The direction is changed downward, and then flows into the refrigerant passage of the meandering flat tube (1) of the intermediate unit (C) from the intermediate portion of the first header (11). Next, the refrigerant passes through the refrigerant passage of the meandering flat tube (1), and then reaches the inside of the header portion (12b) below the partition wall (10) of the second header (12). In addition, the refrigerant
2b) After flowing into the refrigerant passage of the meandering flat tube (1) of the lower unit (B) from the lower half part and flowing through the refrigerant passage of the meandering flat tube (1), Header (11)
And reaches the inside of the header portion (11b) below the partition wall (10), and is discharged from the refrigerant discharge pipe (9) to the outside of the condenser.

According to the capacitors of the third and fourth embodiments, the partition wall (1) is provided between the header forming members of the adjacent heat exchanger units (A) (B) or (B) (C).
0), the end of the flat tube is not obstructed as in the prior art, and the partition wall (10) can be provided very simply and reliably, and as a result, the The flow of the refrigerant in the condenser can be improved, for example, by increasing the moving distance of the refrigerant, and the heat exchange performance is greatly improved.

In the third and fourth embodiments, two or three heat exchanger units (A), (B) and (C) are combined to increase the depth (width) of the condenser. As in the case of the first and second embodiments, the heat exchange performance of the capacitor can be improved, and it is necessary to design a new flat tube shape and manufacture a die for manufacturing the flat tube. Therefore, the productivity is excellent and the manufacturing cost of the capacitor is low.

In the above embodiment, the refrigerant introduction pipe (8) and the discharge pipe (9) are connected to the side wall portions of the headers (11) and (12), or the headers (11) and (12). These pipes (8) and (9) are connected, for example, to the non-connection ends of the headers (1) and (2) at the ends of the headers (1) and (2). ) May be connected.

In the above embodiment, the case where the heat exchanger according to the present invention is applied to a condenser of a room cooler has been described. However, the heat exchanger according to the present invention is similarly applied to an evaporator of a room cooler and the like. is there.

Advantageous Effects of the Invention As described above, the present invention provides a heat exchanger according to the first invention, which comprises a meandering flat tube viewed from a plane and members for header construction attached to both left and right ends of the flat tube. At least two heat exchanger units are stacked on the lower heat exchanger unit, and the large diameter portions are provided at the connection end portions at the upper ends of the left and right header forming members of the lower heat exchanger unit, respectively. The connection ends of the lower ends of the header forming members on the same side of the heat exchanger unit are respectively fitted, and the connection ends of the header forming members are connected to each other in a communicating manner, so that the first and second headers 2 are connected. ) Is formed, and a fluid introduction pipe is connected to one of the first headers, and a fluid discharge pipe is connected to the other second header. To improve performance, the depth (width) of the heat exchanger is increased. ) It is only necessary to increase the number of heat exchanger units, and it is not necessary to design a new flat tube shape or manufacture a die for manufacturing the same, and therefore, it is excellent in productivity and excellent in heat exchange performance Heat exchangers can be manufactured very inexpensively.

According to the first aspect of the present invention, the connection end of one of the header forming members is provided with a large-diameter portion, and the connection end of the other header forming member is directly inserted and connected. It is very easy to connect the connection end portions of the member for use, and the productivity is excellent, and the manufacturing cost is low.

Also, a large-diameter portion is provided at the connection end of one of the header forming members, and the connection end of the other header-forming member is inserted and connected as it is, so that the inner diameter of the header is the same over the entire length. Therefore, the cross-sectional area of the header member does not fluctuate at the connection portion between the upper and lower header member ends, the fluid flow is smooth at the connection portion, the flow path resistance does not increase, and the heat exchange performance is improved. It has the effect of being superior.

Next, a heat exchanger according to a second aspect of the present invention comprises at least two heat exchanger units, each of which comprises a meandering flat tube viewed from a plane and header forming members attached to both left and right ends thereof, and which is vertically stacked. A partition wall is provided at the connection end of the lower end of the right header configuration member of the upper heat exchanger unit, and at the connection end of the upper end of the left and right header configuration members of the lower heat exchanger unit adjacent to the partition wall, Large diameter portions are provided, respectively, and the connection end portion of the lower end of the header configuration member on the same side of the upper heat exchanger unit is fitted into the large diameter portion of the connection end portion on the upper end of the left header configuration member of the lower heat exchanger unit. The first header is formed by connecting the connection end portions of the header constituent members to each other in a communication manner, and the upper heat exchanger unit of the upper heat exchanger unit is attached to the large diameter portion of the right header constituent member of the lower heat exchanger unit. Ipsilateral A second header having two header portions separated by a partition wall is formed by fitting and connecting the connection end portions of the lower ends of the header members, and the fluid is attached to one header portion of the second header. An inlet pipe is connected, a fluid discharge pipe is connected to the other header portion of the second header, and the heat exchanger of the third invention is
A flat tube having a meandering shape as viewed from a plane and header forming members attached to both left and right ends of the flat tube, and at least three heat exchanger units stacked in the vertical direction. A partition wall is provided at the connection end of the lower end of the header configuration member on one side of the upper heat exchanger unit and the connection end of the lower end of the header configuration member on the other side of the intermediate heat exchanger unit. , The partition walls are arranged so as to be located at different levels on the left and right sides alternately, and the connection end of the upper end of the header forming member of the intermediate heat exchanger unit and the connection end of the upper end of the header forming member of the lower unit Each of the large diameter portions is provided, and these large diameter portions are connected to the connection end portion of the lower end of the header configuration member on the same side of the upper unit and the header configuration portion of the intermediate heat exchanger unit. By connecting end portions of the lower end, it is fitted respectively between connection end of the connection end portions and the header structure member of the header structure member is connected,
First and second headers, each separated by a partition wall, are formed, a fluid introduction pipe is connected to a header section above the uppermost partition wall, and a fluid discharge pipe is connected to a header section below the lowermost partition wall. In any of the second and third inventions, when a partition wall is provided in the header, the connection ends of the header forming members of adjacent heat exchanger units are connected to each other. By providing the partition wall between the heat exchangers, the partition wall can be provided very easily and reliably in the header, thereby increasing the movement distance of the fluid in the heat exchanger. Can be improved, and the heat exchange performance is greatly improved.

In order to increase the depth (width) of the heat exchanger in order to improve the performance, it is sufficient to increase the number of heat exchanger units, design a new flat tube shape, and manufacture dies for manufacturing it. Therefore, a heat exchanger having excellent productivity and excellent heat exchange performance can be manufactured at very low cost.

Further, in the second invention and the third invention, a large-diameter portion is provided at a connection end of one of the header forming members,
Since the connection end of the other header forming member is inserted and connected as it is, the connection between the connection ends of the header forming member is very easy, the productivity is excellent, and the manufacturing cost is reduced. Cheap.

Also, a large-diameter portion is provided at the connection end of one of the header forming members, and the connection end of the other header-forming member is inserted and connected as it is, so that the inner diameter of the header is the same over the entire length. Therefore, in the communicating connection portion between the ends of the upper and lower header members, there is no change in the cross-sectional area of the header member, the fluid flow is smooth in the communicating connection portion, and the flow path resistance increases. Without this, the effect that the heat exchange performance is excellent is exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the first invention, FIG. 2 is an exploded perspective view showing a state before connecting the heat exchanger unit, and FIG.
FIG. 5 is a perspective view showing a second embodiment of the first invention. FIG. 4 is an exploded front view showing a state before connecting the heat exchanger units in the embodiment of the second invention, and FIG. 5 is a front view showing a state after connecting the heat exchanger units. FIG. 6 is an exploded front view showing a state before connecting the heat exchanger units in the embodiment of the third invention, and FIG. 7 is a front view showing a state after connecting the heat exchanger units. (A) (B) (C) ... heat exchanger unit, (1) ...
Meandering flat tube, (2) ... corrugated fin, (3)
(4) (3a) (3b) (3c) (4a) (4b) (4c)… Heading member, (5) (6)… Large diameter part, (7a) (7b)
... Closed wall, (8) refrigerant inlet pipe, (9) refrigerant outlet pipe, (10) partition wall, (11) first header, (11)
a) (11b) ... header part, (12) ... second header,
(12a) (12b) ... Header part.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F28D 1/00-9/04 F28F 9/00-9/26 F25B 39/00-39/04

Claims (3)

(57) [Claims] 1. A meandering flat tube (1) viewed from a plane, and header forming members (3) attached to both left and right ends of the flat tube.
(4) and at least two heat exchanger units (A), (B) and (C) stacked in the vertical direction, for the left and right headers of the lower heat exchanger units (B) and (C) Large diameter portions (5) and (6) are provided at the connection end portions at the upper ends of the members (3b) (3c) (4b) (4c), respectively. Exchanger unit (A)
(B) Same side header construction member (3a) (3b) (4a)
(4b) The connection ends at the lower ends are fitted respectively, and the connection ends of the header forming members (3a) (3b), (3b) (3c) and the header forming members (4a) (4b), (4b) By connecting the connection ends of (4c) in a communicating manner, the first and second headers (11) and (12) are formed, and the fluid introduction pipe (8) is connected to one of the first headers (11). ) Is connected, and the fluid discharge pipe (9) is connected to the other second header (12). 2. A meandering flat tube (1) as viewed from a plane, and header forming members (3) attached to both left and right ends of the flat tube.
(4) and at least two heat exchanger units (A) and (B) vertically stacked, and a right header forming member (4a) of the upper heat exchanger unit (A).
A partition wall (10) is provided at the lower end of the connection end, and the left and right header forming members (3b) and (4b) of the lower heat exchanger unit (B) adjacent to the partition wall (10) have a large diameter at the upper end. Department (5)
(6) are provided, respectively, and the large diameter portion (5) of the upper end of the connection member at the upper end of the left header forming member (3b) of the lower heat exchanger unit (B) has the same side as the upper heat exchanger unit (A). The connection end of the lower end of the header forming member (3a) is fitted,
The first header (11) is formed by connecting the connection end portions of the header forming members (3a) and (3b) in a communicating manner, and the right header forming member of the lower heat exchanger unit (B) ( 4b) Upper heat exchanger unit (A) in large diameter part (6)
The connection end of the lower end of the header forming member (4a) on the same side is fitted and connected to form a second header portion (12a) (12b) having two header portions (12a) (12b) separated by a partition wall (10). A header (12) is formed, a fluid introduction pipe (8) is connected to one header portion (12a) of the second header (12), and fluid is discharged to the other header portion (12b) of the second header (12). A heat exchanger to which the pipe (9) is connected. 3. A flat tube (1) meandering as viewed from a plane, and members (3) for header construction attached to both left and right ends of the flat tube (1).
(4) and comprising at least three heat exchanger units (A), (C) and (B) stacked vertically, and at least three heat exchanger units (A) and (B)
(C), the connection end of the lower end of the header forming member (3b) on one side of the upper heat exchanger unit (A) and the header forming member on the other side of the intermediate heat exchanger unit (C) ( 3c) Partition walls (10) and (10) are provided at the lower end connection end, and the partition walls (10) and (10) are arranged so as to be located at different levels alternately on the left and right. Heat exchanger unit (C)
Larger diameter portions (5) (5) ( 6) are provided, and the large-diameter portions (5) and (6) are provided on the same side of the upper unit (A) with the header forming member (3a).
(4a) The connection end of the lower end and the header-forming member (3c) of the intermediate heat exchanger unit (C) (4c) are fitted with the connection end of the lower end, respectively, and the header-forming member (3a)
(3b) By connecting the connection ends of (3c) and the connection ends of the header forming members (4a), (4b), and (4c), they are separated by the partition walls (10) and (10), respectively. First and second headers (11) and (12) are formed, and the fluid introduction pipe (8) is connected to the header portion (12a) above the uppermost partition (10), and the lowermost partition ( 10) A heat exchanger in which a fluid discharge pipe (9) is connected to a lower header section (11b).