JPH0434080B2 - - Google Patents

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]

Hitherto, as shown in Japanese Utility Model Publication No. 53-32376, a stacked heat exchanger has been known, in which a pair of bowl-shaped plates are joined together facing each other, and a plurality of passage units formed by this are stacked. ing.
In such a stacked heat exchanger, both an inlet tank and an outlet tank are formed at one end of a passage unit, and corrugated fins bent in a wave-like manner are arranged between each passage unit.

Figure 8 shows that in such a laminated heat exchanger,
It is a partial perspective view which shows a part of end part of the side where a tank part is not formed. As can be seen from FIG. 8, in the conventional device, the ends of the bowl-shaped plates 501 and 502 that are joined to face each other are bent at a substantially right angle 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,
A fold 505 is formed. The folds 505 of each of the bowl-shaped plates 501 and 502 are joined to the fold-back portion 505 of the bowl-shaped plate of the adjacent passage unit by means such as brazing. In other words, each of the bowl-shaped plates 501 and 502 forming one passage unit 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 following problems occur in the conventional laminated heat exchanger as described above. That is,
At the end where the tank part is formed,
This tank portion has relatively high rigidity, and even if a compressive load is applied in the stacking direction of the passage unit, it can relatively withstand the compressive load. However, at the end where the tank part is not formed as shown in FIG. 8, when a compressive load is applied in the stacking direction of the passage unit,
As shown in FIG.
The wavy fins 503 are deformed at the position indicated by P in the figure, and as a result, the interval between each passage unit is narrowed, and the wavy fins 503 arranged between the passage units are
The problem is that they are crushed.

Note that FIG. 9 is a partially enlarged view of the end portion of the conventional laminated heat exchanger shown in FIG. 8.

[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, it is a laminated heat exchanger in which a pair of bowl-shaped plates are joined facing each other to form a passage unit, and the bowl-shaped plate has an inlet tank recess and an outlet tank recess formed at one end thereof. , and a passage recess that communicates the inlet/outlet tank recesses from one end to the other end is formed in a substantially U-shape. A bent portion is formed on the other end side of at least one of the pair of bowl-shaped plates to face the other adjacent passage unit, and the tip of this bent portion is bent toward the other adjacent passage unit. It is made to contact and join to the joint on the other end side of the passage unit.

[Function and effect of the invention]

In this way, since the tip of the bent portion is joined to the joint of the adjacent passage unit, when a compressive load in the stacking direction of the passage unit acts on the other end of each passage unit, each passage unit This load will be supported at the joint of the bowl-shaped plates.

Therefore, rather than supporting this compressive load with a single bowl-shaped plate, a structure in which two bowl-shaped plates are supported at the joint where they overlap can greatly increase the strength against the compressive load, and the passageway It is possible to prevent deformation of the unit due to compressive load, and it is possible to maintain good dimensions without causing dimensional changes even as a laminated heat exchanger.

〔Example〕

FIG. 6 is a front view when the present invention is used as an evaporator for an automobile air conditioner. Further, FIG. 1 is a plan view of a bowl-shaped plate 100 constituting each passage unit of this evaporator, and FIG.
FIG.

First, the shape of the bowl-shaped plate 100 will be explained based on FIGS. 1 and 2. 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 covering material is made of A3003 material.
Made of A4004 material. The crut 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 1 having a roughly elliptical opening and a cup-shaped opening is provided at one end of the bowl-shaped plate 100 in the longitudinal direction.
01 and an outlet tank recess 105 are formed side by side. This inlet tank recess 10
1 has an inlet hole 10 extending therethrough.
4 is formed. Further, a flange 103 is formed around the opening of the inlet hole 104.

Further, an outlet hole 107 having an oval shape is formed to penetrate through the top portion 106 of the outlet tank recess 105 . As is clear from FIG. 2, the inlet tank recess 101 and the outlet tank recess 105 are recesses that protrude upward in FIG. 1.

Further, a passage recess 120 is connected to the inlet tank recess 101 and the outlet tank recess 105. This concave portion 120 for the passage is formed on the outer circumferential portion of the bowl-shaped plate 100 on the bonding surface 1 for brazing.
21, and is recessed in a substantially U-shape, leaving a center rib 122 at its center. This passage recess 12
The recess amount of 0 is the recess portion 101 for the inlet tank described above.
Although the size of the depression is smaller than that of the outlet tank depression 105, the inlet tank depression 101 is connected to one end of the U-shaped passage depression 120, and the outlet is connected to the other end. Tank recesses 105 are connected. Note that this passage recess 120 is similar to the tank recess 101, 10 described above.
5, it protrudes upward perpendicularly to the plane of the paper in FIG.

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 increasing the heat radiation area of the fluid flowing in the passage recess 120, and in FIG. 1, it protrudes downward perpendicularly to the plane of the paper.

Tank recess 101 of bowl-shaped plate 100,
On the short side where 105 is not formed, there is formed a bent part 130 that extends approximately half the length of the short side and is bent at an almost right angle upward perpendicular to the plane of the paper in FIG. A fold 131 is formed at the tip of the fold 130, which is bent at a substantially right angle from the fold 130.

This bent portion 130 is provided with a plurality of ribs 141 at a portion other than the folded portion 131 at the tip thereof, and has a wavy shape as a whole. The plurality of ribs 141 each extend straight in parallel from the bending base of the folded portion 130 toward the distal end side, and their distal ends are flush with the surface of the folded portion 131.

The folded portion 130 is for maintaining the distance between each passage unit when a plurality of passage units are stacked, and the folded portion 131 is formed from the bending base.
The value is approximately twice the length L (shown in Fig. 2) to the tip of.

An extension 150 is formed on the short side of the bowl-shaped plate 100 over the remaining half length, and a fold 152 bent at a substantially right angle is also formed at the tip of the extension 150. . This fold-back 152 is provided so that when the passage units are stacked and temporarily assembled, the fold-back 131 of the folded portion 130 of the adjacent passage unit engages with the fold-back 131 to facilitate temporary assembly. .

FIG. 3 is a perspective view showing the bent portions 130 and extension portions 150 of opposing bowl-shaped plates 100 in adjacent passage units. In this embodiment, one bent portion 130 and one extended portion 150 are formed on the short side of the bowl-shaped plate 100, but the same number of bent portions 130 and extended portions 150 of the same length may be alternately formed. good.

A pair of such bowl-shaped plates 100 are formed,
The passage unit 200 is formed by facing the tank recesses 101 and 105 and brazing the brazing bonding surfaces 121 and center rib 122 to each other.

FIG. 4 is a sectional view showing a passage unit 200 consisting of a pair of bowl-shaped plates and two bowl-shaped plates arranged on both sides of this passage unit 200. Moreover, FIG. 5 is a partially enlarged view of the lower part of FIG. 4.

As can be seen from FIGS. 4 and 5, especially from FIG.
It is joined onto the joint S of adjacent passage units 200. Therefore, even if a compressive load as shown by arrow F in FIG. 5 is applied, the passage unit 2
00 receives the load from the bent portion 130 at the joint S where the two bowl-shaped plates are overlapped, so the strength against compressive loads is greatly improved.

FIG. 7 shows a comparative example and corresponds to FIG. 5. In what is shown in this figure, no rib is formed on the folded portion 130, and the tip of this folded portion 131 is joined to the extension portion 150 of the bowl-shaped plate rather than to the joint of adjacent passage units. Therefore, when a compressive force as shown by arrow F in the figure acts, the extension part 150, which has no support on the back surface, receives the compressive force from the bent part 130 and is bent and deformed as shown in the figure. the result,
The position of the bowl-shaped plate 100 shifts from the position shown by the broken line in the figure to the position shown by the solid line, and the dimensions of the entire laminated heat exchanger also change.

FIG. 6 is a front view of a stacked heat exchanger constructed by joining a pair of bowl-shaped plates to form a passage unit 200 and stacking the passage units in multiple stages.

When stacking a plurality of passage units 200, the passage units 200 are stacked such that the inlet hole 104 and the outlet hole 107 of each passage unit 200 are at the same position. Further, the flange 103 formed around the opening of the inlet hole 104 is connected to the passage unit 200.
It fits into the entrance hole 104 of the adjacent passage unit 200 when stacking the passage units 200, and plays the role of positioning the passage unit 200.

As shown in FIG. 6, a refrigerant supply pipe 161 and a refrigerant discharge pipe 162 are connected to the passage unit located at the end of the plurality of stacked passage units. That is, the passage unit 20 located at the leftmost end in FIG.
A refrigerant supply pipe 161 is connected to the inlet hole 104 of the passage unit 0, and the outlet hole 104 of this passage unit
7 is occluded. 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. 6, and at the same time, the inlet hole 104 is in a closed state.

Passage units 20 stacked in multiple stages in this way
A fin 168 bent in a wave-like manner is arranged between each of the fins 168. In addition, side plates 16 are provided further outwardly of the passage units located at both ends of the passage units 200 stacked in multiple stages.
Similarly, wavy fins 168 are arranged between the side plate 163 and the outermost passage unit 200.

In this way, the side plate 163, the fins 168, the passage unit 200, the refrigerant supply pipe 161, and the refrigerant discharge pipe 162 are temporarily assembled, and held in this state by a jig (not shown). The evaporator thus temporarily assembled 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. Further, the refrigerant discharge pipe 162 is connected via a pipe joint 165 to a gas phase refrigerant suction pipe of a refrigeration system compressor (not shown).

The operation of such an evaporator itself is the same as that conventionally known, so a description thereof will be omitted.

In this embodiment, a rib 141 is formed on the bent portion in order to connect the tip of the bent portion 130 to the joint S of the adjacent passage unit.
By bending in the opposite direction to 1, the tip of the bent portion 130 is connected to the joint S of the adjacent passage unit.
It may also be joined to.

[Brief explanation of drawings]

Figure 1 is a front view of the bowl-shaped plate, and Figure 2 is the front view of the bowl-shaped plate.
Fig. 3 is a partial perspective view, Fig. 4 is a sectional view showing the joint state of the bowl-shaped plates, Fig. 5 is a partially enlarged view of Fig. 4, and Fig. 6 is a laminated heat exchanger. 7 is a partial sectional view showing a comparative example, FIG. 8 is a perspective view showing a conventional example, and FIG. 9 is a partial front view showing a conventional example. 101... Recessed part for inlet tank, 105... Recessed part for outlet tank, 120... Recessed part for passage, 1
30...Bending portion, 141...Rib, 200...
... Passage unit, S... joint.

Claims (1)

[Scope of Claims] 1. A stacked heat exchanger comprising a plurality of stacked passage units formed by joining a pair of bowl-shaped plates facing each other, wherein the bowl-shaped plate has an inlet tank on one end thereof. A passage recess that forms a recess and an outlet tank recess and communicates the inlet tank recess and the outlet tank recess from one end side to the other end in a substantially U-shape. Further, a bent portion bent toward another adjacent passage unit is formed on the other end side of at least one of the pair of bowl-shaped plates, and a tip end of the bent portion is formed. , a stacked heat exchanger characterized in that the stacked heat exchanger is abutted and joined to a joint on the other end side of another adjacent passage unit. 2. A stacked heat exchanger characterized in that the bent portion is provided with a plurality of ribs extending in the stacking direction of the passage units. 3. The laminated heat exchanger according to claim 1, wherein corrugated fins bent in a wavy manner are arranged between the plurality of passage units. 4. The stacked heat exchanger according to claim 1, wherein the stacked heat exchanger is an evaporator of an air conditioner.