JPS6314083A - Laminated type heat exchanger - Google Patents

Abstract

PURPOSE:To improve the compression strength by folding back the tank side end and the opposite end of a bowl-like plate for forming a conduit unit in the direction away from each other, and, after bonding the adjacent folds, bending the folds in the vertical direction. CONSTITUTION:By bending shorter sides, where a tank recess 101 is not formed, of a pair of bowl-like plates 100 at right angle in the direction away from each other, a fold 130 is formed. By further bending the tip of the fold 130, another fold 131 is formed. The fold 130 consists of a horizontal part and a bent inclination 151. Mating surfaces 121, 122 for brazing of respective bowl-like plates 100 are bonded with each other to form a conduit unit 200. Such are superposed in multiple layers. In this manner, the compression strength can be improved on the side where a tank is not formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stacked heat exchanger, which can be used, for example, as an evaporator for an automobile air conditioner.

[Conventional technology]

Conventionally, as shown in Japanese Utility Model Publication No. 53-32376, a stacked heat exchanger is known, in which a pair of bowl-shaped plates are joined together facing each other, and a plurality of passage units formed thereby are stacked. There is. In such a stacked heat exchanger, both an inlet tank and an outlet tank are formed at one end of the passage unit, and corrugated fins bent in a wavy manner are arranged between each passage unit. .

FIG. 14 is a partial perspective view showing a part of the end portion on the side where the tank portion is not formed in such a laminated heat exchanger. As shown in Fig. 14, in the conventional system,
Bowl-shaped plates 501 joined to face each other
, 502 are bent at substantially right angles in directions away from each other to form a bent portion 504. The tip of this bent portion 504 is further bent at a substantially right angle to form a folded portion 505. The folds 505 of each of the bowl-shaped plates 501 and 502 correspond to the folds 505 of the bowl-shaped plates of the adjacent passage units.
It is joined by means such as brazing. That is,
Bowl-shaped plate 501.5 forming one passage unit
02 is joined to the bowl-shaped plate of the adjacent passage unit at a fold 505.

[Problem that the invention seeks to solve]

However, the conventional laminated heat exchanger as described above has the following problems. In other words, at the end on the side where the tank part is formed, the tank part has relatively increased rigidity, and even if a compressive load is applied in the stacking direction of the passage unit, it will be relatively resistant to the compressive load. It is possible to endure. However, the first
At the end where the tank part is not formed as shown in Fig. 4, when a compressive load is applied in the stacking direction of the passage unit, the folded part 504 moves to the position indicated by P in Fig. 15, as shown in Fig. 15. However, there is a problem in that the wavy fins 503 disposed between the passage units are crushed due to the deformation, which narrows the interval between the passage units.

Note that FIG. 15 is a partially enlarged view of the end portion of the conventional laminated heat exchanger shown in FIG. 14.

[Means for solving problems]

In view of the above-mentioned conventional problems, the present invention provides a laminated heat exchanger in which a tank portion is formed only on one end side. The purpose is to prevent dimensional changes (shrinkage).

In order to achieve this objective, the present invention takes the following measures. That is, the ends of the pair of bowl-shaped plates on the side where the tank is not formed are bent in directions away from each other. Then, this bent portion is joined to the bent portion of the bowl-shaped plate of another adjacent passage unit. Furthermore, this bent portion is bent in a plane perpendicular to the stacking direction of the passage units.

[Function and effect of the invention]

In the present invention, since the bent portion of the bowl-shaped plate is bent in a plane perpendicular to the stacking direction of the passageway units, the rigidity against compressive loads in the stacking direction of the passageway unit can be increased. Therefore, even if such a compressive load in the stacking direction of the passage unit is applied, this compressive load can be sufficiently supported, and as a result, the stacked heat exchanger can always maintain good dimensions without causing any dimensional changes. You can leave it alone.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a front view when the present invention is used as an evaporator for an automobile air conditioner. 3 is a plan view of a bowl-shaped plate 100 constituting each of the passage units of this evaporator, and FIG. 4 is a sectional view of r/-■ in FIG. 3.

First, based on FIGS. 3 and 4, the bowl-shaped plate 100 is
The shape of will be explained. This bowl-shaped plate 100 has a thickness of 0.5 to 0.6 mm, and both sides are coated with a brazing material. Specifically, the core material is made of A3003 material, and the covered skin material is made of A4004 material. The craft ratio of the skin material is 10 to 15%, and the shape shown in FIGS. 3 and 4 is formed by pressing a single plate material.

The bowl-shaped plate 100 has a roughly rectangular shape, and an inlet tank recess 101 and an outlet tank recess 105 each having a roughly elliptical opening and a cup-shaped opening are lined up at one end in the longitudinal direction. It is formed of. An inlet hole 104 is formed in the top part 102 of this recessed part 101 for an artificial tank. Furthermore, a rib 103 is formed around the opening of the entrance hole 104 .

Further, an outlet hole 107, which also has an oval shape, is formed through the top 106 of the outlet tank recess 105. As is clear from FIG. 4, the inlet tank recess 101 and the outlet tank recess 105 are recesses that protrude upward in FIG. 3.

Further, a passage recess 120 is connected to the inlet tank recess 101 and the outlet tank recess 105 . This passage recess 120 is a bowl-shaped plate 1-100.
The inside of the outer periphery is recessed in a substantially U-shape, leaving a brazing bonding surface 121 and a center rib 122 at its center. The amount of recess of this passage recess 120 is the same as that of the inlet tank recess 101 and the outlet tank recess 105 described above.
The inlet tank recess 101 is connected to one side of the U-shaped passage recess 120, and the outlet tank recess 105 is connected to the other end. ing. Note that this passage recess 120 is similar to the tank recess 101, 105 described above.
Similarly, in FIG. 3, it protrudes upward perpendicularly to the plane of the paper.

A plurality of ribs 124 are formed in the passage recess 120 over the entire surface of the passage recess 120. This rib 124 is for passage (to increase the heat dissipation area of the fluid flowing in the recess 120), and in FIG. A bent portion 130 is formed on the short side on which the tank recess is not formed, and is bent at a substantially right angle upward perpendicular to the plane of the paper in FIG. A fold 131 is formed that is bent approximately at a right angle.

Further, as shown in FIG. 3, this bent portion 130 has a bent shape consisting of a horizontal portion 150 and bent inclined portions 151 formed on both sides of this horizontal portion 150. Horizontal part 1
50 is located approximately at the center in the short side direction of the bowl-shaped plate 100, and the bent inclined portion 151 is located at the horizontal portion 15.
It is formed continuously from both ends of 0 and has a shape that is inclined toward the above-mentioned tank recess 101°105 side.

A pair of bowl-shaped plates 100 having such a shape are formed, and the above-mentioned brazing is performed so that the bonding surfaces 121 and the center ribs 122 face each other. A passage unit) 2 formed by joining a pair of plate-shaped plates 100 facing each other in this way
00 are stacked in multiple stages as shown in FIG. At this time, the inlet hole 104 and the outlet hole 1 of each passage unit 200
07 are stacked so that they are at the same position.

Ku. Furthermore, a rib 10 formed at the opening periphery of the entrance hole 104
3 is a stack of passage units 200 (which fit into the entrance holes 104 of adjacent passage units 200), and plays the role of positioning the passage units 20°.

As shown in FIG. 2, a refrigerant supply pipe 161 and a refrigerant discharge pipe 162 are connected to the endmost passage unit of the plurality of stacked passage units. That is, the refrigerant supply pipe 161 is connected to the artificial hole 104 of the passage unit 200 located at the leftmost end in FIG. 2, and the outlet hole 1 of this passage unit
07 is blocked. Further, a refrigerant discharge pipe 162 is connected to the outlet hole 107 of the passage unit 200 located at the rightmost end in FIG. 2, and at the same time, the artificial hole 104 is in a closed state.

A wavy bent fin 168 is arranged between each of the passage units 200 stacked in multiple stages in this way. In addition, a passage unit (multilayer stacked) 200
A side plate 163 is arranged further outward of the passage unit located at both ends, and the same (wavy fin 168) is arranged between this side plate 163 and the outermost passage unit 200. ing.

1 In this way, the side plate 163 and the fin 1
68, passage unit l-200, refrigerant supply piping 161,
The refrigerant discharge pipe 162 is temporarily assembled and held in this state with a jig (not shown). Then, the evaporator temporarily assembled in this way is moved into a furnace (not shown), and the brazing filler metal clad on both sides of each bowl-shaped plate 100 is melted, and then the brazing filler metal is solidified, thereby forming each component. We are performing the joining process.

The refrigerant supply pipe 161 of the evaporator thus assembled is connected to a pressure reducing device of a refrigeration system (not shown) via a pipe joint 164. Also, refrigerant discharge pipe 162
is connected to a gas-phase refrigerant suction pipe of a refrigeration system compressor (not shown) via a pipe joint 1.65.

FIG. 1 is a partial perspective view showing how only half of the bowl-shaped plates 100 constituting each of the two passage units 200 are joined. As can be seen from FIG. 3, a drain hole 135 is formed in the horizontal portion 150 of the bent portion 130, passing through the bent portion 130. This drain hole 1
35 is for discharging the condensed water to the outside when condensed water accumulates between each passage unit, that is, in the space where the fins 168 are located.

Next, bend the bent portion 130 into the horizontal portion 1501 and the bent inclined portion 15.
1 will be explained. FIG. 16 is a perspective view showing only the bent portion 130 of one bowl-shaped plate 100. Further, FIG. 17 is a diagram showing a bent portion 504 of one bowl-shaped plate 103 in the conventional laminated heat exchanger shown in FIG. 14. First, in FIG. 17, it is assumed that a force in the direction indicated by arrow F acts on one bowl-shaped plate 100. This force F then acts on the bent portion 504 in the direction of arrow r. Therefore, the force indicated by the arrow f causes the bent portion 504 to buckle as shown in FIG. 15 above.

On the other hand, as shown in FIG. 16, if the bent portion 130 has a bent structure, when the force shown by the arrow Q in FIG. 16 (compressive load in the stacking direction of the passage unit 200) is applied, A force in the direction shown by arrow q acts on the portion 150, and a force in the direction shown by arrows c and e acts on the bent inclined portion 151.

The force in the direction shown by each arrow causes the horizontal portion 150 to
, the bent inclined portion 151 tends to collapse in the direction in which each force acts, but for example, in the horizontal portion 150, the bent portions 301 and 303 with the bent inclined portion 151 prevent this horizontal portion 150 from collapsing. Work like you do. Similarly, the bent portions 301 and 302 of the two bent inclined portions 151 prevent the two bent portions from collapsing.

That is, the bending portion 130 as a whole has improved rigidity against the compressive load Q, and the bending portion 130 has improved rigidity against the compressive load Q.
This prevents the entire 30 from falling down.

FIG. 12 is a diagram schematically showing this bent portion 130, in which the width dimension of the bowl-shaped plate lOO is U, and the bent inclined portion 151
The length in the width direction is t, and the length in the longitudinal direction is S. FIG. 13 shows the buckling limit load of the bent portion 130 when the dimension t is 25 m1, the width dimension U is 90 mm, and the longitudinal dimension S is changed. As can be seen from FIG. 13, the buckling limit load of the bent portion 130 increases as the length S in the longitudinal direction of the bent inclined portion 151 increases. That is, as the bending angle between the horizontal portion 150 and the bent inclined portion 151 approaches 90″, the buckling limit load of the bent portion 130 increases.

Note that the operation of the evaporator itself is exactly the same as that of conventionally known evaporators, so a description thereof will be omitted.

Next, other embodiments of the present invention will be described based on FIGS. 5 to 11.

In the above embodiment, the bent portion 130 is the horizontal portion 150,
Although the bent portion 130 has a bent shape consisting of the bent inclined portion 151, the bent portion 130 may be formed into an arc shape as shown in FIG. The bent portion 130 shown in FIG. 5 is a circular arc portion that projects outward in the longitudinal direction, but it projects in the opposite direction to the circular arc portion shown in FIG. That is, it may have an arcuate shape that protrudes inward with respect to the longitudinal direction.

Further, as shown in FIG. 6, the bent portion 130 may be constructed from a plurality of continuously formed inclined portions 601.

In the example shown in FIG. 6, this inclined portion 601 has four peaks, and the bowl-shaped plates to be joined to each other are joined with these continuous peaks out of phase with each other.

Furthermore, in the one shown in FIG. 7, the horizontal portion 150 shown in FIG.
The state is such that two consecutive bent portions are formed, each consisting of a slanted portion 151 and a slanted portion 151 . That is, the bent inclined portion 70
1, a horizontal portion 702, a bent inclined portion 701, a bent inclined portion 701, a horizontal portion 702, and a bent inclined portion 701, which are successively formed. Similarly to the folded part 131 shown in FIG.
It consists of

In the case shown in Fig. 8, the bending shape of the bent portion is the first
Although it is the same as that shown in the figure, the turned part 800 has a shape consisting of only a horizontal part as shown in FIG. As shown in FIG. 9, a triangular protrusion formed at a position facing the oblique part 151 around bend 1 in this return part 800 has a protrusion that makes the fitting hole 901 and the fitting protrusion 902 face each other. are formed together. The two bowl-shaped plates are positioned by fitting the fitting protrusion 902 into the fitting product 901.

In the case shown in FIGS. 7 and 8, drain holes 135 are formed in the horizontal portion 702 and the horizontal portion 150, respectively, as in the example shown in FIG.

In the one shown in FIG. 10, the bent portion 100 is bent into a semicircular shape to form semicircular protrusions 910 continuously at regular intervals. In this case, the return part 1
31 has a shape consisting only of a horizontal portion.

Furthermore, in the case shown in FIG. 11, the bent inclined portions 921 are formed continuously, so that the triangular peak portions have a continuous shape. These continuous triangular ridges are arranged in the same phase in all the bent parts. Note that the first
Even in the case shown in FIG. 1, the folded portion 131 has a shape consisting of only a horizontal portion as shown in FIG.

In the other embodiments described above, the other configurations and operations are completely the same as those of the first embodiment described above, so detailed explanations will be omitted.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing the first embodiment of the present invention, Fig. 2 is a front view of the first embodiment, Fig. 3 is a front view showing the bowl-shaped plate of the first embodiment, and Fig. 4 is a front view of the bowl-shaped plate of the first embodiment. 3 is an IV-IV sectional view, FIGS. 5 to 11 are partial perspective views showing other embodiments of the present invention, FIG. 12 is a schematic diagram schematically showing the first embodiment, and FIG. 13 14 is a partial perspective view showing a conventional example, and FIG. 15 is a partial plan view showing a conventional example.
FIG. 16 is a perspective view showing the operation of the first embodiment of the present invention;
FIG. 7 is a perspective view showing the operation of the conventional example. 100... Bowl-shaped plate 101... Inlet tank recess, 105... Outlet tank recess, 120
... Passage recessed part, 130... Bend part, 15
0...Horizontal part, 151...Bending slope part, 200...
・Aisle unit. Representative Patent Attorney Takashi OkabeFigure 10Figure 15

Claims (1)

[Claims] A passage unit is constructed in multiple stages by joining a pair of bowl-shaped plates facing each other, each having an inlet tank recess and an outlet tank recess at one end, and a passage recess connecting these two recesses. In the laminated heat exchanger, the other ends of the pair of bowl-shaped plates form a bent portion bent in directions away from each other, and this bent portion is formed by connecting the bowl-shaped plates of other adjacent passage units. The stacked heat exchanger is connected to a bent portion of the passage unit, and the bent portion is bent in a plane perpendicular to the stacking direction of the passage unit.