JPH0451760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a heat exchanger formed by bending a roll bond panel and used, for example, in an evaporator for a refrigerator.

Conventional technology Roll bond panels are made by applying an anti-crimping material to the heat exchange medium passage formation area of two aluminum base plates, overlapping them and pressing them together, and then introducing fluid pressure into the passage formation area. It is manufactured by expanding and expanding the tube. Conventionally, there are two types of such expansion tubes: a single-sided expansion tube that expands only on one side of the base plate, and a double-sided expansion tube that expands to the same height on both sides of the base plate. (For example, Special Publication No. 32-3712). For example, the refrigerator evaporator 11 shown in FIG. 9 using such a roll bond panel is formed by bending a roll bond panel having a heat exchange medium passage 14 so as to form a cross-sectional shape at bending portions C ₃ and C ₄ . It is formed by In FIG. 9, 11a is a mounting portion, 12a is a heat exchange medium inlet pipe, and 12b is an outlet pipe. In the case of such a refrigerator evaporator, the upper surface of the intermediate portion of the bottom wall 11b, that is, the surface on the ice-making compartment side, is sometimes made flat for reasons such as increasing the contact area with an ice-making tray or the like. Therefore, in the case of such refrigerator evaporators, the 10th
As shown in the developed view of the figure, the area where the flat surface is to be formed is a single-sided expanded tube where only the lower base plate 15b is expanded.
In addition to P ₄ , the other parts are double-sided swollen tube parts P ₅ in which both the upper and lower base plates 15a and 15b are bulged.
The roll bond panel 13 was manufactured by bending and forming the panel at bending sections C ₃ and C ₄ .

Problems to be Solved by the Invention However, in such conventional heat exchangers,
In the roll bond panel 13 to be used, at the time of transition from the single-sided expansion tube part P ₄ to the double-sided expansion tube part P ₅ ,
Since the height of the expansion tube of the heat exchange medium passage 14 on the non-expansion tube side 13a of the single-sided expansion tube portion _P4 was made to rise suddenly as shown in FIG. There were flaws.

That is, normally, the bending parts C ₃ and C ₄ are double-sided expansion pipe parts.
It is set near the single-sided expansion tube part P ₄ in P ₅ , but due to errors in dimensional accuracy, the single-sided expansion tube part P ₄
The boundary between the double-sided swelling tube part P ₅ is the bending part C ₃ and C ₄
Bending and forming may be performed while the material is inside. In this case, as shown in FIG. 12, there is a drawback that not only the lower end 16a of the rising tube portion 16 causes a so-called bent state, but also the appearance of the tube is impaired.

On the other hand, such a bent portion C ₃ of the rising portion 16,
In order to prevent the intrusion into C ₄ , precision is required to accurately set the formation positions of the single-sided expansion tube part P ₄ and the double-sided expansion tube part P ₅ . The following drawbacks also occurred during the manufacturing stage of the bond panel 22. That is, the single-sided inflation tube part _P4 and the double-sided inflation tube part _P5 are formed by using an elastic member 17 made of sponge or the like and having a rectangular cross section as an inflation tube blocking member, as shown in FIG. After setting in the planned position, lower the upper and lower inflation tube bed 1.
This was done by inflating the tube between 8a and 18b and then forming the crimping _part so that it became a flat surface. Before setting the elastic member, a pre-expansion tube is applied to the heat exchange medium passage 1.
4 pattern is highlighted,
For this reason, there was a problem in that it took a long time to manufacture.

The above-mentioned drawbacks are not limited to evaporators for refrigerators, but are caused by bending and forming a roll bond panel where the ends of a single-sided expansion tube part and a double-sided expansion tube part meet in the vicinity of the boundary. Similar problems occurred in other heat exchangers manufactured.

The present invention has been made in view of this technical background, and when bending a roll bond panel, bending is performed with the ends of the single-sided expanded tube part and the double-sided expanded tube part entering the bending part. The purpose of the present invention is to provide a heat exchanger that does not buckle even when worn, has a good appearance, and can shorten manufacturing time.

Means for Solving the Problems For this purpose, the heat exchanger according to the present invention:
The roll bond panel constituting the heat exchanger is placed between the single-sided expansion tube section and the double-sided expansion tube section, and the expansion tube height gradually increases from the non-expanded side of the single-sided expansion tube section toward the double-sided expansion tube section. The invention is characterized in that it has a gradually increasing inflation tube section that changes in shape, and is formed by bending at or near the gradually increasing inflation tube section.

Embodiment Next, the structure of the present invention will be explained based on the embodiment shown in FIGS. 1 to 8.

This embodiment shows an evaporator for a refrigerator similar to that shown in the conventional explanation, and 1 is an evaporator;
1a is a mounting portion, 4 is a heat exchange medium passage formed in a predetermined pattern, 2a is an inlet pipe connected to the inlet of the heat exchange medium passage, and 2b is an outlet pipe. This evaporator 1 is formed into a cross-sectional shape by bending a roll bond panel at substantially right angles at bending portions C ₁ and C ₂ as in the conventional evaporator. The bottom wall 1b of the heat exchanger 1 has a flat upper surface except for the bent portions at both ends and the vicinity thereof.

The roll bond panel 3 forming the evaporator 1 is
As shown in FIG. 3, the above-mentioned planar surface formation site has a single-sided expanded tube part _P1 , and continuous bending parts _C1 and _C2 are included at both ends of this single-sided expanded tube part _P1 . It has gradually increasing swelling tube parts P ₂ and P ₂ in the range, and further has double-sided swelling tube parts P ₃ and P ₃ continuous to one side of the gradually increasing swelling tube part. That is, a gradually increasing inflation tube section _P2 is provided between the single-sided inflation tube section _P1 and the double-sided inflation tube section _P3 . The heat exchange medium passage 4 has a single-sided expansion tube section.
In P ₁ , as shown in FIGS. 1 and 6, the lower base plate 5b is formed by being expanded downward, and in the double-sided expanded tube portion, as shown in FIGS. 1 and 5, The upper and lower base plates 5a and 5b are each formed by being expanded to the same height in the vertical direction. In addition, in the gradually increasing inflation tube section _P2 , the inflation tube height H gradually changes from the upper base plate 5a of the single-sided inflation tube section _P1 toward the double-sided inflation tube section _P3 , as shown in Fig. 1. It is said that Therefore, the single-sided swelling tube part
The expansion tube height H of each heat exchange medium passage 4 from P ₁ to the double-sided expansion tube section P ₃ naturally transitions via the gradually increasing expansion tube section P ₂ , resulting in a sudden change in the expansion tube height. There are no locations where this occurs.

The evaporator 1 shown in FIGS. 2 and 4 is formed by bending the roll bond panel 3 having such a configuration at the bending sections C ₁ and C ₂ . In this case, for example, an error may occur in the formation position of the single-sided expansion tube part P ₁ or the double-sided expansion tube part P ₃ , and these ends may be bent.
Even if bending is performed while entering C ₁ and C ₂ , since there is no step difference in the height of the expansion tubes of the heat exchange medium passage 4, bending will not occur.

By the way, the roll bond panel 3 having the above-mentioned single-sided expansion tube part P ₁ , gradually increasing expansion tube part P ₂ , and double-sided expansion tube part P ₃ in succession is manufactured in the following manner.
That is, two aluminum base plates 5a and 5b are coated with an anti-crimping agent at the portion where the heat exchange medium passage is planned to be formed.
is placed on the upper surface of the lower bed of the upper and lower inflation tube beds 6a and 6b, which are opposed to each other with a predetermined distance maintained between them, as shown in FIG. Next, Figure 8a
As shown in FIG. 2, an elastic member 7 having an inverted trapezoidal cross-section with left and right side surfaces 7a slanting outward from the bottom surface to the top surface, or an elastic member 7 in which both upper ends of the slanted side surfaces are vertically formed as shown in FIG. ' is set so that its lower surface is located at the one-sided inflation tube portion planned site of the base plate to prevent the expansion tube. Then, as shown in FIG. 7, the area corresponding to the horizontal portion of the lower surface of the elastic member 7 is blocked from expanding on the lower base plate and becomes a one-sided expansion tube, with a semicircular cross section as shown in FIG. While the heat exchange medium passage 4 is formed, the height of the expansion tube of the heat exchange medium passage gradually changes in the range corresponding to the sloped side portion of the elastic member 7. Further, in other areas where the elastic member 7 is not present, the heat exchange medium passages 4 are expanded evenly upward and downward, and have a hexagonal cross section as shown in FIG. Then, the post-inflation tube crimping portion is formed to have a flat surface. The material of the elastic member 7 is the same as that of the conventional one, and is made of sponge or the like. In addition, when the gradually increasing expansion tube part _P2 is formed only on one end side of the single-sided expansion tube part _P1 , and the double-sided expansion tube part _P3 is continuously formed on the other end side, the elastic member 7'' is used as the elastic member 7''. As shown in FIG. 8C, one in which only one side surface is inclined outward from the lower surface to the upper surface, or one in which the upper part of the inclined side surface is cut vertically may be used.

Effects of the Invention According to the above, the present invention first installs a roll bond panel constituting a heat exchanger between a single-sided expanded tube section and a double-sided expanded tube section, from the non-inflated side of the single-sided expanded tube section to the double-sided expanded tube section. Since the heat exchange medium passage is formed to have a gradually increasing expansion tube portion in which the height of the expansion tube gradually changes toward the expansion tube portion, each heat exchange medium passageway from the one-sided expansion tube portion to the double-sided expansion tube portion The inflation tube height naturally transitions through the gradually increasing inflation tube section, and there is no place where the inflation tube height changes abruptly. Since such a roll bond panel is formed by bending at the gradually increasing expansion tube section or its vicinity, even if the end of the single-sided expansion tube section or the end of the double-sided expansion tube section enters the bending section, It has a good external appearance with no bends, and can be used as a good-looking heat exchanger. Furthermore, as mentioned above, even if the end of the single-sided inflation tube section or the end of the double-sided inflation tube section enters the bending part, the waist does not bend, so the single-sided inflation tube section or the double-sided inflation tube section There is no longer a need for precision in the positioning of the elastic member, that is, the precision in the setting of the elastic member when the roll bond is expanded. Therefore, there is no need for a preliminary expansion tube to float the circuit pattern as in the past, and the time for expansion tubes and the time for manufacturing the heat exchanger can be shortened.
Moreover, it is possible to attach an elastic member to either the upper or lower expansion tube bed during expansion tube work, which improves work efficiency, and together with shortening the manufacturing time mentioned above, it is possible to create a heat exchanger with high productivity. It can be done.

[Brief explanation of the drawing]

1 to 8 show examples of the invention, and FIG. 1 is a sectional view of the main parts of the heat exchanger in an expanded state;
Fig. 2 is a perspective view of an evaporator for a refrigerator, Fig. 3 is a plan view of the unfolded state, Fig. 4 is a front sectional view showing the vicinity of the bent part of the evaporator shown in Fig. 2, and Fig. 5 is a 1
Figure 6 is a cross-sectional view taken along the - line in Figure 1, Figure 7 is a cross-sectional view for explaining the method of manufacturing roll bond panels, and Figure 8 is a cross-sectional view used to manufacture roll bond panels. Cross-sectional view of elastic member, No. 9
Figures 13 to 13 are diagrams for explaining conventional heat exchangers, and Figure 9 is a perspective view of a refrigerator evaporator.
Figure 0 is a plan view of the evaporator in the expanded state in Figure 9;
Figure 1 is a front sectional view showing the vicinity of the bent part of the evaporator shown in Figure 9, and Figure 12 is a diagram for explaining the drawbacks of the conventional heat exchanger, which is also a front sectional view showing the vicinity of the bent part. 13 are cross-sectional views for explaining a method of manufacturing a roll bond panel. 1...Main body, 3...Roll bond panel, 4...
...Heat exchange medium passage, C ₁ , C ₂ ...Bending section, P ₁
...Single-sided swelling tube part, _P2 ... Gradually increasing swelling tube part, _P3 ...Double-sided swelling tube part, H...Dwelling tube height.

Claims (1)

[Claims] 1. The heat exchange medium passage has a single-sided expansion tube part formed by a single-sided expansion tube and a double-sided expansion tube part formed by a double-sided expansion tube, and a combination of the single-sided expansion tube part and the double-sided expansion tube part. The roll bond panel has a gradually increasing inflation tube portion in between, in which the inflation tube height of the passageway gradually changes from the side of the single-sided inflation tube portion that is not inflated to the double-sided inflation tube portion, and 1. A heat exchanger characterized by being formed by bending at or near the expansion tube portion.