JP2689003B2 - Stacked heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a laminated heat exchanger used in an air conditioner for a vehicle, in particular, a pair of tanks is formed on one side, and the heat exchange is continuous in a U-shaped passage. The present invention relates to a laminated heat exchanger formed by laminating a plurality of elements and corrugated fins.

(Prior Art) In recent years, with the increase in size of vehicles, the laminated heat exchanger of this type also tends to increase in size. In increasing the size of the heat exchanger, the conventional so-called two-pass refrigerant passage configuration causes a marked uneven flow of the refrigerant, resulting in a poor heat exchange rate and is not practical. Therefore, the number of refrigerant passages such as four passes, six passes, and eight passes has been increased (see, for example, Japanese Utility Model Laid-Open No. 63-197978).

(Problems to be Solved by the Invention) However, when a refrigerant passage having four or more paths is formed, the refrigerant inlet pipe and the refrigerant outlet pipe are provided on opposite sides. Therefore, the inlet / outlet pipe, the expansion valve connected to the inlet / outlet pipe, and the like are arranged in the ventilation passage, which causes ventilation resistance and reduces the cooling capacity.

Therefore, in view of the above problems, it is an object of the present invention to provide a laminated heat exchanger that can configure four or more refrigerant passages and can have inlet and outlet pipes arranged side by side.

(Means for Solving the Problems) In order to achieve the above object, a laminated heat exchanger according to the present invention is provided with a pair of tanks, a U-shaped passage that connects them, and an independent member provided between the pair of tanks. A heat exchange element group in which heat exchange elements each having a central tank and corrugated fins are alternately laminated, end plates are arranged at both ends in the lamination direction, and tanks of adjacent heat exchange elements are appropriately communicated with each other. A plurality of stages are provided, a refrigerant passage having a forward path and a return path between one tank group and the other tank group of each heat exchange element group, and a central tank group are configured, and each heat exchange element group A pair of adjacent tank groups are connected to each other to form each refrigerant passage in series, and one end of the series refrigerant passage is connected to one end of a central tank group connected in series, Set on one of the end plates It is composed of digits.

In addition, another laminated heat exchanger according to the present invention is a corrugated heat exchange element having a pair of tanks, a U-shaped passage communicating between these tanks, and a pipe communicating portion provided between the pair of tanks. Fins are alternately stacked, end plates are arranged at both ends in the stacking direction, and a plurality of stages of heat exchange elements that appropriately communicate the tanks of adjacent heat exchange elements are provided, one of each heat exchange element group being provided. A refrigerant passage having an outward path and a return path between the tank group and the other tank group, and a pipe path is formed in the center, and one of a pair of tank groups adjacent to each heat exchange element group is communicated with each other to form a refrigerant path. Is formed in series, and an inlet / outlet pipe is arranged in the central pipe passage, and a communicating means for communicating one end of the serial refrigerant passage and one end of the inlet / outlet pipe is provided on one of the end plates. It is a thing.

(Operation) Therefore, in the invention described in claim 1, the heat exchange elements and the fins are alternately laminated, and the laminated heat exchange elements are divided into a plurality of heat exchange element groups. , 2 paths (outward path and return path) of refrigerant passages are formed for each heat exchange element group, and by connecting them in series, 4 paths, 6 paths, 8 paths corresponding to twice the number of heat exchange element groups are formed. In addition, it is possible to form a multi-pass refrigerant passage, and by connecting one end and a series central tank group to each other through a communication means provided on one end plate, the inlet and outlet pipes are arranged side by side. Is what you can do.

Further, in the invention according to claim 2, the central tank group is replaced with an inlet / outlet pipe, and one end of the serial refrigerant passage and one end of the inlet / outlet pipe are connected to one end plate. By communicating through the provided communication means, the same operation as above is obtained.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a 6-pass laminated heat exchanger (hereinafter referred to as “heat exchanger”), which comprises a heat exchanger body 2 and a heat exchanger. The main body 2 is provided with an inlet pipe (or an outlet pipe) 4 for supplying a refrigerant and an outlet pipe (or an inlet pipe) 6 for discharging the refrigerant after heat exchange, and these are integrally brazed and assembled in a furnace. Has been.

The heat exchanger body 2 is configured by alternately stacking the heat exchange elements 8 and the corrugated fins 10 and disposing end plates 12A and 12B at both ends in the stacking direction.

As shown in detail in FIGS. 2 and 3, the heat exchange element 8 is constituted by joining two forming plates 20, 20 facing each other. The molding plate 20 has a groove portion 22, 23,
24 is formed, and the ridge 25 extends upward from the vicinity of the groove 23 at the center thereof, and the groove portions on both sides are formed on the periphery thereof.
A groove portion 26 communicating with 22, 24 is formed. The heat exchange element 8 is constituted by joining two of these, and inside thereof, the tanks 30 and 32 from the groove portions 22 and 24 facing each other, the tank 34 at the center from the groove portions 23, and the U-shaped portion from the groove portions 26 of each other. Passageways 36 are each configured. Here, the tanks 30 and 32 communicate with each other through a U-shaped passage 36, while the central tank 34 is independent. Further, these tanks 30 and 32 and the central tank 34 are provided with courses 30A, 32A and 34A formed at the centers thereof, respectively, so that the tanks that abut between adjacent heat exchange elements communicate with each other. .

In this heat exchanger body 2, the heat exchange elements 8 described above are arranged as shown in FIG. 2, and the heat exchange elements 8 are divided into, for example, three equal parts, and the first, second and third heat exchanger elements are divided into three equal parts. The heat exchange element groups 100, 200, and 300 of FIG. This first, second,
The third heat exchange element group 100, 200, 300 is provided between the tank group 101, 102, 301 (constituted by each tank 32) and the tank group 102, 202, 302 (constituted by each tank 30).
The U-shaped passage 36 includes two passages (outgoing and returning passages) through which the refrigerant moves, and central tank groups 103, 203, and 303 (each central tank 34). Then, the first, second, and third heat exchange element groups 100, 200, 300
The two-pass refrigerant passages of the tank groups 102 and 202 and the tank groups 201 and 301 are in the tank portions where they are in contact with each other.
Are communicated with each other to form a total of 6 paths of refrigerant passages. The 6-pass refrigerant passage includes the opening 40, 42 in which the tank group 101 on one end side is provided on the one end plate 12A and the lid 22 for communication.
Is connected to one end of a series of central tank groups 103, 203, 303 via. The lid 44 used here is formed as a bottomed box as shown in FIG. 4, and its opening side is in contact with the end plate 12A. On the other hand, the tank group 302 on the other end side of the six-pass refrigerant passage is connected to the refrigerant outlet pipe 6. In addition, the central tank group 103, 203, 303 in series
The other end of is communicated with the refrigerant inlet pipe 4. still,
Between the tank groups 101 and 201, the tank groups 202 and 302, for example, the groove
The structure is such that the molding plate 20A that does not form an opening is used to communicate the 24 with each other. Further, both the inlet pipe 4 and the outlet pipe 6 are the refrigerant inlet holes 4 formed in the other end plate 12B.
6. The refrigerant is inserted into the refrigerant outlet hole 48 and arranged side by side, and its end plate 12B closes the right opening 32A of the tank 32 that is in contact with it. On the other hand, the above-mentioned end plate 12A closes the left opening 30A of the tank 30 that is in contact therewith.

As shown in FIG. 5, the heat exchanger assembled as described above has a group of central tanks connected in series via the inlet pipe 4.
Refrigerant flowing into 103, 203, 303 passes through the lid 44 to the first
To the tank group 101 of the heat exchange element group 100, to the tank group 102 via the U-shaped passage 36, and from there to horizontal movement to the tank group 202 of the second heat exchange element group 200. To the tank group 201 through the U-shaped passage 36, and then to the tank group 301 of the third heat exchange element group 300.
6 passages that are horizontally moved to the tank group 302 via the U-shaped passage 36 and are discharged from the outlet pipe 6 (or follow the reverse route). Therefore, by connecting in series the first, second, and third heat exchange element groups 100, 200, and 300 each having a two-pass (outgoing and returning) refrigerant passage as described above, a desired 6 The inlet passage 4 and the outlet pipe 6 can be made the same by connecting the one end side to the central tank groups 103, 203, 303 in series through the lid body 44 provided on the end plate 12A while being able to form the refrigerant passage of the path. It can be installed side by side.

FIG. 6 shows a second embodiment of a six-pass heat exchanger, which will be described below. However, the same components as those described in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted, and only different points will be described below.

The difference between the heat exchanger shown in FIG. 6 and the first embodiment described above is that one end plate 12A used in the heat exchanger main body 2 has the end shown in detail in FIG. It is in place of the plate 12C. This end plate 12C has openings 50, 51 downward in the drawing.
A groove portion 53 having a groove and a groove portion 55 having no opening are formed so as to bulge, and the opening surface of the groove portion 53 is closed by a lid 57 having a larger shape than that. Such end plate 12
As shown in FIG. 6, C is disposed at the left end of the heat exchanger main body 2 in the drawing, and is a communication passage formed between the groove 53 and the lid 57.
Tank group 1 of the first heat exchange element group 100 via 60
The structure is such that 01 is connected to the central tank group 103, 203, 303 in series. Further, the groove portion 55 has the tank 30 abutting against it.
It is designed to block the left opening 30A.

Such a heat exchanger, as shown in FIG.
The refrigerant introduced into the central tank group 103, 203, 303 in series via the tank group of the first heat exchange element group 100 through the communication passage 60 formed between the groove portion 53 of the end plate 12C and the lid 57. To the tank group 102 via the U-shaped passage 36, and from there to the tank group 2 of the second heat exchange element group 200.
02 to the tank group 202 via the U-shaped passage 36 to the tank group 201, and then to the tank group 301 of the third heat exchange element group 300 to the U-shaped passage 36. A six-pass refrigerant passage that moves to the tank group 302 and is discharged from the outlet pipe 6 (or follows the reverse path) is configured. Therefore, similar to the heat exchanger described in the first embodiment, first, second, and third heat exchange element groups each having a two-pass (outgoing and returning) refrigerant passage formed therein.
By connecting 100, 200, and 300 in series, a desired 6-pass refrigerant passage is formed, and one end of the passage is connected to the end plate 12
By communicating with the central tank group 103, 203, 303 in series via the communication passage 60 formed between the groove 53 of C and the lid 57,
The inlet pipe 4 and the outlet pipe 6 can be arranged side by side on the same side surface.

Next, an embodiment according to the invention described in claim 2 will be described. FIG. 9 shows an example in which a 6-pass heat exchanger is configured. The heat exchanger includes a heat exchanger main body 2, an inlet / outlet pipe 49 for supplying a refrigerant from a side surface of the heat exchanger main body 2, An outlet pipe 4 for discharging the refrigerant after heat exchange is provided, and these are assembled by brazing together in a furnace.

The heat exchanger main body 2 is configured by alternately stacking the heat exchange elements 50 and the corrugated fins 10 and disposing end plates 12A and 12B at both ends in the stacking direction.

The forming plate 60 constituting the heat exchange element 50 is slightly different in structure from the forming plate 20 used in the embodiment according to the invention described in claim 1. The different point is that, as shown in detail in FIG. 10, a substantially U-shaped cutout 62 is formed at a position corresponding to the central groove 23 by replacing the groove portion 23, and the other points are. It is the same. A heat exchange element is formed by joining two such molded plates 60 together.
50 is configured, and inside thereof, the groove portions 22 and 24 facing each other, the tanks 30 and 32, and the notch 62 from each other and the pipe passage portion 64.
However, the U-shaped passage 36 is constituted by the respective groove portions 26. Openings 30A and 32A are formed in the centers of the tanks 30 and 32 so that tanks that abut between adjacent heat exchange elements communicate with each other.

The heat exchanger main body constituted by having the above-mentioned heat exchange element 50 has the heat exchange elements 50 arranged as shown in FIG. 9 and divided into three equal parts, first, second, It constitutes a third heat exchange element group 100, 200, 300. The first, second, and third heat exchange element groups 100, 200, 300 are
The tank group 101, 201, 301 (consisting of each tank 32)
And tank groups 102, 202, 302 (consisting of each tank 30.)
Between the two passages (forward and return) in which the refrigerant moves in the U-shaped passage 36, and pipe passages 71, 72, 73 formed by stacking the pipe passage portion 64 in a groove shape at the center. It is configured.
Then, the first, second, and third heat exchange element groups 10
The two-pass refrigerant passages each of 0, 200, and 300 have a total of six-pass refrigerant passages in which the tank groups 102 and 202 and the tank groups 201 and 301 communicate with each other in the tank portion where they come into contact. On the other hand, the lead-in / out pipe 49 is fitted and fixed in the openings 42, 46 of the pipe passages 71, 72, 73 and the end plates 12A, 12B. One end of the lead-in / out pipe 49 is communicated with the tank group 101 on the one end side of the above-described 6-pass refrigerant passage through the openings 40, 42 provided in the one end plate 12A and the lid 44 for communication. There is. The lid 44 used here is the same as that used in the first embodiment according to the invention described in claim 1, and its opening surface is in contact with the end plate 12A. On the other hand, the tank group 302 on the other end side of the six-pass refrigerant passage is connected to the refrigerant outlet pipe 6. In addition, tank groups 101 and 2
The 01 and the tank groups 202 and 302 are structured so as not to communicate with each other by using, for example, a molding plate 60A having no opening in the groove 24. In addition, the outlet pipe 6 is the other end plate 12B.
Is inserted in the refrigerant outlet hole 48 formed in the above, and is arranged in parallel with the lead-in / out pipe 49, and its end plate 12B closes the right opening 32A of the tank 32 abutting against it. On the other hand, the above-mentioned end plate 12A
Closes the left opening 30A of the tank 30 abutting against it.

In the heat exchanger assembled as described above, as shown in FIG. 11, the refrigerant introduced into the inlet / outlet pipe 49 is
To the tank group 101 of the first heat exchange element group 100, to the tank group 102 via the U-shaped passage 36, and from there to horizontal movement to the tank group 202 of the second heat exchange element group 200. Then, it moves from the tank group 202 to the tank group 201 via the U-shaped passage 36, then horizontally moves to the tank group 301 of the third heat exchange element group 300, and then to the tank group 302 via the U-shaped passage 36. A six-pass refrigerant passage that moves and is discharged from the outlet pipe 6 (or follows the reverse path) is configured. Therefore, as described above, the first, second, and third refrigerant passages each having two paths (outgoing path and returning path) are configured.
By connecting the heat exchange element groups 100, 200, and 300 in series, a desired 6-pass refrigerant passage can be formed, and at the same time, the one end side of the outlet / inlet pipe 49 is provided via the lid body 44 provided on the end plate 12A. To communicate with the outlet pipe 6
And the lead-in / out pipe 49 can be arranged side by side on the same side surface.

(Effects of the Invention) As described above, in the invention according to claim 1, the heat exchange elements and the fins are alternately laminated to constitute an appropriate number of heat exchange element groups, each of which is 2 By connecting the refrigerant passages of the paths (forward and return) in series, a heat exchanger of the refrigerant passages corresponding to twice the number of the heat exchange element groups can be constructed, and one end of the heat exchanger is connected to one end plate. Since it is communicated with the central tank group through the communication means provided in the above, the refrigerant inlet / outlet pipes can be arranged in parallel on the same side surface. Therefore, four-pass, six-pass, and other multi-pass refrigerant passages can be formed in accordance with the desired size of the heat exchanger, and the heat exchange rate can be improved.
The income pipes can be installed side by side to reduce the installation space.

Further, according to the invention of claim 2, the same effect as that of the invention of claim 1 is obtained by adopting a configuration in which the lead-in / out pipe is fitted and fixed to the main body in place of the above-mentioned central tank group. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of the laminated heat exchanger of the first embodiment according to the invention as seen from the inlet / outlet pipe side, and FIG. 2 is a sectional view of the laminated heat exchanger of the same. Fig. 3 is a perspective view of a forming plate used in the same laminated heat exchanger, Fig. 4 is a perspective view of the same laminated heat exchanger as seen from the side opposite to the inlet / outlet pipe side, and Fig. 5 is the same laminated heat exchanger. FIG. 6 is a schematic view showing the flow of refrigerant in the exchanger, FIG. 6 is a sectional view of the laminated heat exchanger in the second embodiment, and FIG. 7 is a perspective view of end plates and the like used in the laminated heat exchanger of the same. FIG. 8 is a schematic diagram showing the flow of the refrigerant in the above laminated heat exchanger, and FIG.
Sectional view of a laminated heat exchanger of an embodiment according to the invention described in,
FIG. 10 is a perspective view of a forming plate used in the above laminated heat exchanger, and FIG. 11 is a schematic diagram showing a flow of a refrigerant in the above laminated heat exchanger. 2 ... Heat exchanger body, 4 ... Inlet pipe, 6 ... Outlet pipe, 8,50 ... Heat exchange element, 10 ... Fin, 12A,
12B, 12C …… End plate, 44, 57 …… Lid, 49 …… Lead-in / out pipe, 71, 72, 73 …… Pipe passage, 100, 200, 300 …… First,
Second and third heat exchange element groups, 103, 203, 303 ... Central tank group.

Claims (2)

(57) [Claims] 1. A heat exchange element having a pair of tanks, a U-shaped passage connecting these tanks, and an independent central tank provided between the pair of tanks, and corrugated fins are alternately laminated to form a heat exchange element. End plates are arranged at both ends in the stacking direction, and a plurality of stages of heat exchange elements are provided in which the tanks of adjacent heat exchange elements are connected to each other as appropriate, and one tank group of each heat exchange element group and the other tank group A refrigerant passage having a forward path and a return path between, and a central tank group is configured, one of a pair of adjacent tank groups of each heat exchange element group is communicated to form each refrigerant passage in series, A laminated heat exchanger, characterized in that one end of the end plate is provided with communication means for communicating one end of the series refrigerant passage and one end of a central tank group that is connected in series. 2. A heat exchange element having a pair of tanks, a U-shaped passage communicating with the tanks, and a pipe communicating portion provided between the pair of tanks, and corrugated fins are alternately laminated and laminated. End plates are arranged at both ends in the direction, and a plurality of heat exchange element groups are provided in which the tanks of adjacent heat exchange elements are connected to each other as appropriate. A refrigerant passage having an outward path and a return path between them and a pipe passage are formed in the center, one of a pair of adjacent tank groups of each heat exchange element group is communicated to form each refrigerant passage in series, and the central pipe A stacking type heat exchange device, characterized in that an inlet / outlet pipe is arranged in the passage, and a communication means for communicating one end of the serial refrigerant passage and one end of the inlet / outlet pipe is provided on one of the end plates. vessel.