JP2024055613A - Cup-plate stacked heat exchanger - Google Patents

Abstract

[Problem] To reliably position the cup plate and the inner fins arranged inside in a cup plate stacked heat exchanger. [Solution] The outer peripheral edge 4a of the inner fin 4 adjacent to the peripheral wall of the cup plate has a protrusion 5 that protrudes from the outer peripheral edge 4a toward the peripheral wall, and the protrusion 5 of the inner fin 4 contacts the inner surface of the peripheral wall of the cup plate, or the protrusion 5 of the inner fin 4 contacts the inner surface of the boundary between the peripheral wall and the flat surface of the cup plate. [Selected drawing] Figure 2

Description

The present invention relates to a cup-plate stacked heat exchanger with inner fins inside, and in particular to a structure that prevents the inner fins from shifting to one side.

A conventional cup-plate stacked type heat exchanger is known in which a first cup plate and a second cup plate are cup-shaped, each having a flat surface and a peripheral wall on its outer periphery, and the peripheral walls are alternately stacked together, overlapping each other at their peripheral walls to form a core, and an inner fin is arranged on the flat surface of at least one of the cup plates within the cup of the first cup plate or the second cup plate.
The inner fins are arranged to improve heat exchange performance and pressure resistance. The inner fins are made by bending a plate material into a corrugated shape.
When assembling a cup plate stacked type heat exchanger, there is a step of stacking the cup plates and inner fins, and then applying a load in the stacking direction to compress them.
The cup plate is designed to be large relative to the inner fins so that it can be placed even if the outer dimensions of the inner fins are at the upper tolerance limit. In a cup-plate stacked heat exchanger before brazing, the inner fins move within the cup plate, causing the inner fins to become misaligned. If the inner fins are brazed in this state, a gap occurs between the peripheral wall of the cup plate and the outer periphery of the inner fins, or the gap increases, causing a decrease in performance.
In order to solve this problem, a cup plate stacked type heat exchanger has been proposed, as described in Patent Document 1 below.

In the structure described in Patent Document 1, inner fins are arranged between dish-shaped cup plates, and in order to keep the gap between the outer periphery of the inner fins and the peripheral wall of the cup plate constant, multiple protrusions are formed between the peripheral wall of the cup plate and the inner fins, and the inner fins are positioned by the protrusions coming into contact with the inner fins. These protrusions are formed integrally with the cup plates within the cups of the cup plates.

Patent No. 6529709

However, in order to prevent the inner fin from being biased toward the peripheral wall in the above-mentioned protruding portion structure of Patent Document 1, it is necessary to form a protruding portion on the plane between the peripheral wall and the inner fin, which creates a gap between the peripheral wall and the inner fin due to the protruding portion, thereby reducing pressure resistance. Also, if the protruding portion is brought close to the peripheral wall, the formability of the boundary between the peripheral wall and the plane of the cup plate and the peripheral wall of the cup plate will be deteriorated, which may cause poor brazing between the cup plates and leakage of the fluid flowing inside.
At the same time, when positioning the inner fin using a protrusion provided on the cup plate, even if the protrusion is provided on the cup plate with precision, the outer shape of the inner fin has large dimensional variation (particularly noticeable in the dimensions in the direction of the wave wavelength), and since it depends on the molding precision of the inner fin, the positioning precision cannot be improved, and the inner fin tends to become biased and the gap to become large.

Furthermore, depending on the shape of the inner fin or the size of the protrusion, the crest of the wave of the inner fin may straddle the protrusion, and the protrusion formed on the cup plate may not function as a positioning device.
Furthermore, if the inner fins climb onto the inner surface of the peripheral wall of the cup plate during the compression process after stacking, they cannot be fully compressed with the appropriate load (a load that does not crush the inner fins within the cup plane of the cup plate and does not open the peripheral wall of the cup plate). If the compression load is excessively high, the entire inner fin will buckle, the height between the cup plates will decrease, and the heat exchange performance will deteriorate, or the peripheral wall will open outward, leading to leakage of the fluid flowing inside the core.

The objective of the present invention is to provide a cup plate that can be accurately positioned without providing a positioning protrusion on the cup plate itself.

The first invention for solving the above problem provides a cup-shaped first cup plate 1 and a cup-shaped second cup plate 2 each having flat surfaces 1b, 2b and peripheral walls 1a, 2a on their outer peripheries, and having boundary portions 1c, 2c at the boundaries between the flat surfaces 1b, 2b and the peripheral walls 1a, 2a;
A core 3 in which the cup plates 1 and 2 are alternately stacked and overlap each other at their peripheral walls 1 a and 2 a;
an inner fin 4 disposed in a cup of at least one of the first cup plate 1 and the second cup plate 2;
Equipped with
In a cup plate stacked type heat exchanger, a part or all of an outer peripheral edge 4a of an inner fin 4 is adjacent to a peripheral wall of a cup plate on which the inner fin 4 is arranged,
The inner fin 4 has an outer peripheral edge 4a adjacent to the peripheral wall of the cup plate, and a protrusion 5 protruding from the outer peripheral edge 4a toward the peripheral wall,
This cup plate stacked type heat exchanger is characterized in that the protrusions 5 of the inner fins 4 are in contact with the inner surface of the peripheral wall of the cup plate, or in contact with the inner surface of the boundary portion of the cup plate.

The second invention is the cup plate stacked type heat exchanger according to claim 1,
The inner fins 4 are made of corrugated plate material, and are a cup-plate laminated type heat exchanger having the protrusions 5 formed on the outer peripheral edges 4a that exist in a direction perpendicular to the ridge lines 4b of the corrugations.

The third invention is the cup plate stacked type heat exchanger of claim 1,
The inner fins 4 are made of corrugated plate material and have projections 5 formed on the outer peripheral edges 4a that lie in the direction of the ridge lines 4b of the corrugations.

The fourth invention is a cup plate stacked type heat exchanger according to any one of claims 1 to 3,
In the cup plate stacked type heat exchanger, the plate thickness of the protrusions 5 is 0.3 mm or less, and the width W of the protrusions 5 perpendicular to the protruding direction of the protrusions 5 is 10 mm or less.

The fifth invention is the cup plate stacked type heat exchanger according to claim 2,
The inner fin 4 is made of a corrugated plate material,
The outer peripheral edge 4a on which the protrusions 5 are formed has a first region 5a in which the protrusions 5 are formed, and a second region 4aa located in the vicinity of the first region 5a in which the protrusions 5 are not formed,
This is a cup plate stacked type heat exchanger in which, when the inner fin 4 is deployed in a direction perpendicular to the corrugated ridge 4b, the position of the tip of the first region 5a is aligned with the position of the tip of the second region 4aa, or the position of the tip of the first region 5a is located inside the position of the tip of the second region 4aa.

The cup plate stacked type heat exchanger of the first invention is characterized in that the inner fin 4 has a protrusion 5 that protrudes from the outer peripheral edge 4a of the inner fin 4, which is close to the peripheral wall of the cup plate on which the inner fin 4 is arranged, toward the peripheral wall, and the protrusion 5 of the inner fin 4 contacts the inner surface of the peripheral wall of the cup plate or contacts the inner surface of the boundary portion of the cup plate.
Due to this feature, the inner fin 4 is positioned relative to the cup plate in the protruding direction of the protrusion 5, so that the inner fin 4 does not become misaligned.
This makes it possible to specify the amount of the gap that occurs between the outer peripheral edge 4a other than the portion where the protrusion 5 is formed and the peripheral wall of the cup plate. By specifying the amount of the gap, it is possible to improve the assembly accuracy.
Furthermore, since there is no need to provide a protrusion on the cup plate on which the inner fins 4 are arranged, the formability of the cup plate is not deteriorated.
This allows the peripheral walls 1a, 2a of the cup plates 1, 2 and the cup plates on which the inner fins 4 are disposed to be brazed to the inner fins 4 in a satisfactory manner.
When a protrusion is formed on the plane of the cup plate as in the background art, it is conceivable that the inner fin may ride up on the protrusion of the cup plate depending on the shape of the inner fin. However, in the present invention, no protrusion is formed on the plane of the cup plate on which the inner fin 4 is arranged, so there is no risk of this happening.

The cup-plate stacked type heat exchanger of the second invention is characterized in that, in the above-mentioned first invention, the inner fins 4 are made of corrugated plate material and the protrusions 5 are formed on the outer peripheral edges 4a that exist in a direction perpendicular to the ridge lines 4b of the corrugations.
The direction perpendicular to the ridge lines 4b of the waveform is the direction (wavelength direction) in which the external dimensions of the inner fins 4 vary greatly when the inner fins 4 are formed from a plate material.
In the case where a convex portion is formed on the plane of the cup plate as in the background art, if there is a large variation in the dimensions of the inner fins, it is conceivable that the inner fins will ride up on the convex portion and will not function as positioning. However, in the second invention, no convex portion is formed on the cup plate on which the inner fins 4 are arranged, so there is no risk of the inner fins riding up on the convex portion.
Furthermore, when a convex portion is formed on the flat surface of the cup plate as in the background art, it is difficult to prevent the inner fins from becoming unevenly displaced.
The reason is that even if the outer dimensions of the inner fin are molded at the upper tolerance limit, a convex portion needs to be provided at a wide position on the inner fin so that it does not ride up on the protrusion, and when the outer dimensions of the inner fin are molded at the lower tolerance limit, a gap is created between the convex portion and the inner fin, causing the inner fin to move. In the present invention, if the protrusion portion 5 contacts the inner surface of the peripheral wall or the inner surface of the boundary of the cup plate on which the inner fin 4 is arranged, it has a positioning effect, and dimensional variations in the inner fin 4 can be absorbed in the range from the peripheral wall to the boundary. Therefore, the dimensional tolerance of the inner fin is wider than when a convex portion is formed on a flat surface in the background art.

The cup plate stacked type heat exchanger of the third invention is characterized in that, in the first invention, the inner fins 4 are made of corrugated plate material and have protrusions 5 formed on the outer peripheral edges 4a that exist in the direction of the corrugated ridges 4b.
The direction of the wavy ridge 4b is the direction in which the dimensional accuracy of the inner fin 4 is high, and by providing the protrusion 5 there, the accuracy of the position of the protrusion 5 is increased, and the gap between the inner fin 4 and the inner surface of the peripheral wall or the inner surface of the boundary part of the cup plate in which the inner fin is arranged can be identified with greater accuracy.
Furthermore, when a protrusion is formed on the plane of the cup plate as in the background art, it is conceivable that the inner fin 4 may ride up on the protrusion of the cup plate when the inner fin 4 is corrugated. However, in the present invention, no protrusion is formed on the plane of the cup plate on which the inner fin 4 is arranged, so there is no risk of this happening.

The cup plate stacked type heat exchanger of the fourth invention is characterized in that, in either the second or third invention, the plate thickness of the protrusion portion 5 is 0.3 mm or less, and the width W of the protrusion portion 5 perpendicular to the protruding direction of the protrusion portion 5 is 10 mm or less.
With this configuration, even if the protrusion 5 rides up onto the peripheral wall or boundary of the cup plate on which the inner fin 4 is arranged, when an appropriate load is applied in the compression process, the protrusion 5 can be easily crushed in part or in whole. Therefore, the cup plates 1, 2 and the inner fin 4 do not float up during assembly of the core 3, and the brazing between the cup plates and the inner fin 4 does not deteriorate.
In addition, since the protrusion 5 can be easily and sufficiently crushed with an appropriate load, there is no risk of the peripheral walls 1a, 2a opening outward.

The cup plate stacked type heat exchanger of the fifth invention is the second invention, in which the inner fin 4 is made of a corrugatedly bent plate material, and the outer peripheral edge 4a on which the protrusions 5 are formed has a first region 5a which forms the protrusions 5 and a second region 4aa which is located in the vicinity of the first region 5a and does not form the protrusions 5, and is formed so that when the inner fin 4 is expanded in a direction perpendicular to the corrugated ridge 4b, the position of the tip of the first region 5a is aligned with the position of the tip of the second region 4aa.
As a result, the material width of the protrusion 5 does not extend beyond the material width of the outer peripheral edge 4a, and the yield of the molding of the inner fin 4 can be improved.
In this invention, when the inner fin 4 is deployed in a direction perpendicular to the corrugated ridge 4b, the tip position of the first region 5a may be located inside the tip position of the second region 4aa (the tip position of the second region 4aa may be located outside the tip position of the first region 5a).

FIG. 2 is an exploded perspective view of a first embodiment of the cup plate stacked type heat exchanger of the present invention. FIG. 4 is a plan view of the cup plate on which the inner fins 4 of the cup plate stacked type heat exchanger are arranged. FIG. 3 is an enlarged view of part III in FIG. 2 . FIG. 4 is an exploded view of a main portion of an inner fin 4 used in the present invention. FIG. 4 is a plan view of a main portion of the inner fin 4 after molding. Cross-sectional view taken along the line CC of FIG. 4B. 3 is a first embodiment showing a relationship between an inner fin 4 and a cup plate in the present invention. The second embodiment. 13 is a diagram showing a state in which the tip of a protrusion 5 of an inner fin 4 rides up onto the peripheral wall of a cup plate in the present invention. FIG. 6A and 6B are diagrams showing how the tips of the protrusions 5 are crushed when the core 3 is compressed in the present invention. FIG. 4 is a plan view of an inner fin 4 used in a second embodiment of the cup plate stacked type heat exchanger of the present invention. FIG. 4 is a plan view of an inner fin 4 having a plurality of protrusions 5 in one direction according to the present invention.

Next, an embodiment of the present invention will be described with reference to the drawings.
As shown in Figure 1, this cup plate stacked type heat exchanger has a cup-shaped first cup plate 1 having a plane 1b, a peripheral wall 1a on its outer periphery, and a boundary portion 1c at the boundary between the plane 1b and the peripheral wall 1a, and a cup-shaped second cup plate 2 having a plane 2b, similar to the first cup plate 1, and a peripheral wall 2a and boundary portion 2c on its outer periphery.
The cup plates 1, 2 are alternately stacked, and the peripheral walls 1a, 2a of the cup plates 1, 2 overlap each other to form a core 3.
As shown in Fig. 2, the peripheral shape of the flat surfaces 1b and 2b of each of the cup plates 1 and 2 is formed in a square shape (including a shape with rounded corners). However, the shape of the peripheral shape of the flat surfaces 1b and 2b is not limited to a square shape, and may be a polygon or a circle.
The boundaries 1c, 2c of the cup plates 1, 2 are usually formed with a rounded R, but may not be formed with a R. For example, they may be angular without a R, have a gradually varying R, or be chamfered.

On the flat surface 1b of the first cup plate 1, a first communication hole 6 is formed at one diagonal position of the four corners of the rectangle, and a second communication hole 7 is formed at the other diagonal position.
An annular portion 11 protrudes from the edge of the second communication hole 7 of the first cup plate 1 towards the top plate 15 .
Similarly to the first cup plate 1, the second cup plate 2 is formed with a first communication hole 6 and a second communication hole 7. An annular portion 11 protrudes from the edge of the first communication hole 6 of the second cup plate 2 toward the top plate 15.
The annular portion 11 of the first communication hole 6 of the second cup plate 2 is connected to the first communication hole 6 of the adjacent first cup plate 1. Also, the annular portion 11 of the second communication hole 7 of the first cup plate 1 is connected to the second communication hole 7 of the adjacent cup plate 1.
In the embodiment of FIG. 1, the pair of first communication holes 6 and the pair of second communication holes 7 are formed at diagonal positions of each of the cup plates 1, 2, but are not limited to these positions.
For example, a pair of first communication holes 6 may be formed on one side of opposing sides of the peripheral walls 1a, 2a of each cup plate 1, 2, and a pair of second communication holes 7 may be formed on the other side.

In this example, there are no dimples on the flat surface 1b of the first cup plate 1, and a large number of dimples 10 are formed on the flat surface 2b of the second cup plate 2 toward the top plate 15. Therefore, the cup plates 1 and 2 have different shapes.
However, the dimples 10 do not have to be formed on the second cup plate 2. In other words, the second cup plate 2 may have the same shape as the first cup plate 1. In this case, the cup plates 1 and 2 can be stacked while rotating each one around the center position of the cup plates 1 and 2 as an axis.
The number of cup plates to be stacked is not limited to two or one type.
Three or more types of cup plates may be stacked together to form the core 3. For example, a third cup plate having annular portions 11 provided in a pair of first communication holes 6 may be disposed at a middle position in the stacking direction of the cup plates 1 and 2.

In this example, an inner fin 4 is disposed within the cup of the first cup plate 1. An outer peripheral edge 4a of the inner fin 4 is adjacent to the inner surface of the peripheral wall 1a of the first cup plate 1.
However, it is sufficient that the inner fin 4 is disposed in at least one of the cups of the first cup plate 1 or the second cup plate 2. For example, when stacking cup plates 1 and 2 that do not have dimples 10, the inner fin 4 can be disposed on the flat surface 2b of the second cup plate 2 in the same manner as the first cup plate 1.
For example, an offset fin, a corrugated fin, or other wave-shaped inner fins can be used as the inner fin 4. The inner fin 4 in this embodiment is an offset fin as shown in Figures 1, 2, and 3, and the ridge lines 4b of the wave are cut and raised in a staggered pattern on both sides of the center line L along the direction of the center line L of the wave ridge line 4b.
The inner fins 4 have a corrugated shape when viewed from a direction (the direction of the ridge lines 4b of the corrugation) perpendicular to the direction in which the plate material is continuously bent (the direction of the wavelength).
In the following embodiments, the offset type inner fins 4 will be described as an example, but the present invention is not limited to this.
2, the inner fin 4 in this example has notches formed therein to avoid the communication holes 6, 7, and has a cross shape when viewed from the stacking direction of the cup plates 1, 2. However, the shape of the inner fin 4 to avoid the communication holes 6, 7 is not limited to the notches shown in the figure, and may be a hole. In this case, the shape will be similar to that of the plane 1b.
In this example, the inner fin 4 is disposed in the cup of the first cup plate 1 such that the direction of the wavy ridge line 4b of the inner fin 4 is parallel and perpendicular to the inner surface of the peripheral wall 1a of the first cup plate 1 when viewed from the stacking direction of the cup plates 1 and 2. This is not limiting, and as another example, the direction of the wavy ridge line 4b of the inner fin 4 may be oblique to the inner surface of the peripheral wall 1a of the first cup plate 1 when viewed from the stacking direction of the cup plates 1 and 2.

An inlet/outlet 14 for the second fluid 9 is formed at the upper part in the stacking direction of each of the plates 1 and 2. Also, an inlet/outlet for the first fluid 8 is formed at the lower part in the stacking direction (not shown).
In this example, a first fluid 8 flows within the cups of the first cup plate 1 , and a second fluid 9 flows within the cups of the second cup plate 2 .
As an example, the first fluid 8 may be oil, and the second fluid 9 may be cooling water or a refrigerant. In the core 3, heat exchange takes place between the first fluid 8 and the second fluid 9.

The cup plate stacked type heat exchanger of the present invention has the following features.
The inner fin 4 has a protrusion 5 on an outer periphery 4a thereof, which protrudes from the outer periphery 4a toward the peripheral wall 1a of the first cup plate 1. (The inner fin 4 disposed on the first cup plate 1 will be described below.)
This protrusion 5 comes into contact with the inner surface of the peripheral wall 1 a of the first cup plate 1 or the inner surface of the boundary portion 1 c of the first cup plate 1 .
Specifically, the outer peripheral edge 4a does not contact the peripheral wall 1a of the first cup plate 1 placed thereon, and the protrusion portion 5 contacts the inner surface of the peripheral wall 1a of the first cup plate 1 (or the inner surface of the boundary portion 1c of the first cup plate 1).
Due to this feature, the inner fin 4 is positioned relative to the first cup plate 1 in the protruding direction of the protrusion 5. In other words, the amount of the gap between the outer peripheral edge 4a of the portion where the protrusion 5 is formed and the peripheral wall 1a of the first cup plate 1 can be specified, improving the assembly accuracy. In addition, there is no need to provide a protrusion or the like on the stacked cup plates 1 and 2, simplifying the structure. Therefore, brazing between the peripheral walls 1a and 2a of the cup plates 1 and 2 and brazing between the cup plates 1 and 2 and the inner fin 4 can be performed well.

In the first embodiment, as shown in FIG. 2, protrusions 5 are formed on the outer peripheral edge 4a that exists in a direction perpendicular to the center line L of the wavy ridge line 4b (the up-down direction in the figure) and on the outer peripheral edge 4a that exists in the direction of the center line L of the wavy ridge line 4b (the left-right direction in the figure).
In this embodiment, the protrusions 5 are formed at the center of each outer periphery 4a.
As shown in Figures 2 and 3, each protrusion 5 protrudes in two directions and contacts the peripheral wall 1a of the first cup plate 1. By forming the protrusions 5 in two directions, the inner fin 4 can be held in the center position of the first cup plate 1 without being biased. Although the protrusion 5 shown in Figures 2 and 3 is one on each side for one protruding direction, this is not limited thereto, and there may be multiple protrusions as shown in Figure 7.
The protrusions 5 shown in Figures 2 and 3 are on the center line 4c of the inner fins 4 on the peripheral wall 1a of the first cup plate 1 extending in the protruding direction, but this is not limited to this and may be off the center line 4c.

When manufacturing a cup-plate stacked heat exchanger, the inner fin 4 is usually grasped and placed in the cup of the first cup plate 1 by an automatic assembly device such as a robot arm, not by human power. Since there is no protrusion 5 on the center line 4c, the inner fin 4 can be easily grasped, and the posture of the inner fin 4 when grasped is stabilized, and the stacking process of the parts can be performed smoothly. When placing the inner fin 4 on the first cup plate 1, both ends of the inner fin 4 are grasped and dropped from above the first cup plate 1 toward the flat surface 1b of the first cup plate 1. By providing the protrusion 5, when the inner fin 4 is dropped, the protrusion 5 comes into contact with the inner surface of the peripheral wall 1a or the inner surface of the boundary portion 1c of the first cup plate 1, and the inner fin 4 is guided to the center of the first cup plate 1, so that the inner fin 4 can be reduced from bouncing off the first cup plate 1.

4A to 4C show means for forming the protrusions 5 of the inner fin 4. FIG.
The outer periphery 4a of the inner fin 4, on which the protrusions 5 are formed, is divided into a first region 5a forming the protrusions 5 and a second region 4aa forming the outer periphery 4a in the vicinity of the first region 5a.
4A shows the outer peripheral edge 4a of the inner fin 4 when it is expanded in a direction perpendicular to the center line L of the corrugated ridge line 4b. In this state, the tip of the first region 5a is aligned with the tip of the second region 4aa.
With the above-described configuration, the material width of the protrusion 5 does not extend beyond the material width of the outer peripheral edge 4a, and therefore the yield of the inner fins 4 is improved.
Not limited to this, even if the tip position of the second region 4aa is greater than the tip position of the first region 5a, the effect can be obtained because the material width of the protrusion portion 5 does not extend beyond the material width of the outer peripheral edge 4a.

When the first region 5a and the second region 4aa are formed, a slit 13 can be formed at the boundary between them. By forming the slit 13, it is possible to change the forming pitch, which is the wavelength dimension of the waves in the first region 5a and the second region 4aa.
As shown in Figures 4B and 4C, by making the molding pitch of the first region 5a coarser (larger) than the molding pitch of the second region 4aa, even if the tip of the first region 5a and the tip of the second region 4aa are aligned in the expanded state of the inner fin 4, a protrusion 5 that protrudes from the outer peripheral edge 4a after molding can be formed.

5A and 5B show the relationship between the peripheral walls 1a, 2a or boundary portions 1c, 2c of the cup plates 1, 2 and the tips of the protruding portions 5 of the inner fins 4. FIG.
In FIG. 5A , the tip of the protrusion 5 of the inner fin 4 is located on the flat surface 2 b side of the second cup plate 2 and is in contact with the upper part of the peripheral wall 1 a of the first cup plate 1 .
In FIG. 5B, the tip of the protrusion 5 of the inner fin 4 is located on the flat surface 1b side of the first cup plate 1, in the vicinity of the boundary portion 1c thereof.
The inner fins 4 arranged in the first cup plate 1 may have their tips of the protruding portions 5 positioned on the flat surface 2b side of the second cup plate 2 or on the flat surface 1b side of the first cup plate 1. In other words, the inner fins 4 can be arranged in the first cup plate 1 without managing the front and back sides.
5B, by controlling the front and back of the inner fin 4 and unifying the position of the tip of the protrusion 5 on the flat surface 1b side of the first cup plate 1, the peripheral wall 1a with which the protrusion 5 comes into contact can be made to be more inward, or the protrusion 5 can come into contact with the boundary portion 1c on the inside of the peripheral wall 1a instead of the peripheral wall 1a. Therefore, the length from the outer circumferential edge 4a to the tip of the protrusion 5 can be shortened.

5A and 5B have been described with respect to the case where the tip of the protrusion 5 of the inner fin 4 does not ride up on the peripheral walls 1a, 2a of the cup plates 1, 2. However, in the process of assembling the core 3, as shown in FIG. 5C, it may happen that the tip of the protrusion 5 of the inner fin 4 rides up on the peripheral walls 1a, 2a or the boundary portions 1c, 2c of the cup plates 1, 2 and floats up from the flat surfaces 1b, 2b of the cup plates 1, 2.
When the inner fin 4 is placed in the cup plates 1 and 2 and the core 3 in which the cup plates 1 and 2 are stacked is subjected to a compressive load 16, the tip of the protrusion 5 of the inner fin 4 is crushed and becomes a deformed portion 12, as shown in Figure 5D.
In this case, if the dimension of the tip of the protrusion 5 in the stacking direction of the cup plate (the crushed height of the tip of the protrusion 5) is h1 and the dimension of the outer peripheral edge 4a other than the protrusion 5 in the stacking direction of the cup plate (the height of the outer peripheral edge 4a other than the protrusion 5) is h2, then the height h1 will be shorter than the height h2.
Although the above describes the case where only a portion of the protrusion 5 is crushed, this is the case where only a portion of the protrusion 5 rides up onto the peripheral walls 1a, 2a. If the entire protrusion 5 rides up onto the peripheral walls 1a, 2a, the entire protrusion 5 will be crushed.
On the other hand, the parts of the protrusions 5 other than the tips thereof on the planes 1b and 2b of the cup plates 1 and 2 are not crushed, and the uncrushed parts of the protrusions 5 and the outer peripheral edge 4a are pressed against the plane 2b of the second cup plate 2 and come into contact with the plane 1b of the first cup plate 1.
Therefore, a part of the protrusion 5 can be crushed in the compression process, so that the assembly of the cup plates 1, 2 and the brazing of the cup plates 1, 2 and the inner fins 4 are not deteriorated.

Here, the plate thickness of conventional inner fins 4 is 0.3 mm or less, and in the cup plate stacked type heat exchanger of the present invention having inner fins 4 of the same plate thickness or less, in order to crush the protrusions 5 with an appropriate load during the compression process so as not to crush the inner fins 4 on the planes 1b, 2b of the cup plates 1, 2, the width W of the protrusions 5 shown in Figures 2, 3, and 4B can be made 10 mm or less.
If the compression load is the appropriate load, the cup plate, which has higher rigidity than the protrusion 5, will not open outward.
When there are multiple protrusions 5, the width W of each protrusion 5 may be the same for all protrusions 5 or may be different for each protrusion 5. Furthermore, the width W of each protrusion 5 may be constant from the base to the tip, or may not be constant. For example, the tip may be tapered.

FIG. 6 is a plan view of an inner fin 4 used in a second embodiment of the cup plate stacked type heat exchanger of the present invention.
The inner fin 4 in FIG. 6 has protrusions 5 formed only on the outer circumferential edges 4a on both sides that exist in the direction of the center line L of the wave-shaped ridge line 4b (the left-right direction in the figure).
In this embodiment as well, the protrusion 5 is formed at the center of the outer circumferential edge 4a.
The direction of the center line L of the wavy ridge 4b is the direction in which the dimensional accuracy of the inner fin 4 is high, and since the protrusion 5 is provided there, the positioning accuracy of the protrusion 5 is high and the gap with the inner walls of the cup plates 1, 2 can be easily identified.

Alternatively, although not shown, the protrusions 5 of the inner fin 4 may be formed only on the outer peripheral edge 4a that exists in a direction perpendicular to the center line L of the wavy ridge line 4b.
The direction perpendicular to the center line L of the wavy ridgeline 4b is the direction (wavelength direction) in which the dimensional variation of the outer shape of the inner fin 4 is large when the inner fin 4 is formed from a plate material. However, if the protrusion 5 contacts the inner surface of the peripheral wall or the inner surface of the boundary of the cup plate on which the inner fin 4 is arranged, it has a positioning effect, and the dimensional variation of the inner fin 4 can be absorbed in the range from the peripheral wall to the boundary. Therefore, the dimensional tolerance of the inner fin is wider than when a protrusion is formed on the plane of the cup plate in the background art. The dimensional tolerance of the inner fin 4 is wider.
This makes it easy to adjust the gap between the inner fins 4 and the cup plates 1, 2, and provides a highly accurate cup-plate stacked type heat exchanger.
The inner fin 4 of the first embodiment described above has the effects of both the second and third embodiments.

The present invention is applicable to the structure of a cup-plate stacked heat exchanger, and can be used, for example, in an oil cooler for a vehicle.

REFERENCE SIGNS LIST 1 First cup plate 1a Peripheral wall 1b Plane 1c Boundary 2 Second cup plate 2a Peripheral wall 2b Plane 2c Boundary 3 Core

4 Inner fin 4a Outer periphery 4aa Second region 4b Ridge line 4c Center line L Center line of wavy ridge line 4b 5 Projection 5a First region

6 First communication hole 7 Second communication hole 8 First fluid 9 Second fluid 10 Dimple 11 Annular portion 12 Deformed portion 13 Slit 14 Inlet/outlet 15 Top plate 16 Compressive load h1 Crushed height of tip of protrusion 5 h2 Height of outer circumferential edge 4a other than protrusion 5 W Width of protrusion 5

Claims (5)

a first cup plate (1) and a second cup plate (2) each having a cup-like shape, the first cup plate (1) having a flat surface (1b, 2b) and a peripheral wall (1a, 2a) on its outer periphery, and a boundary portion (1c, 2c) at the boundary between the flat surface (1b, 2b) and the peripheral wall (1a, 2a);
A core (3) in which the cup plates (1, 2) are alternately stacked and overlap each other at their peripheral walls (1a, 2a);
An inner fin (4) disposed in a cup of at least one of the first cup plate (1) and the second cup plate (2);
Equipped with
In a cup-plate stacked type heat exchanger, a part or all of an outer peripheral edge (4a) of an inner fin (4) is adjacent to a peripheral wall of a cup plate on which the inner fin (4) is arranged,
The inner fin (4) has an outer peripheral edge (4a) adjacent to the peripheral wall of the cup plate, and a protrusion (5) protruding from the outer peripheral edge (4a) toward the peripheral wall,
A cup plate stacked type heat exchanger characterized in that the protrusions (5) of the inner fins (4) are in contact with the inner surface of the peripheral wall of the cup plate or in contact with the inner surface of the boundary part of the cup plate. 2. The cup plate stacked type heat exchanger according to claim 1,
The inner fin (4) is made of a corrugated plate material, and the protrusions (5) are formed on the outer peripheral edge (4a) that exists in a direction perpendicular to the ridge lines (4b) of the corrugation. 2. The cup plate stacked type heat exchanger according to claim 1,
The inner fin (4) is made of a corrugated plate material and has a protrusion (5) formed on the outer peripheral edge (4a) existing in the direction of the ridge line (4b) of the corrugation. In the cup plate stacked type heat exchanger according to any one of claims 1 to 3,
A cup plate stacked type heat exchanger, wherein the plate thickness of the protrusion (5) is 0.3 mm or less, and the width (W) of the protrusion (5) perpendicular to the protruding direction of the protrusion (5) is 10 mm or less. 3. The cup plate stacked type heat exchanger according to claim 2,
The inner fin (4) is made of a corrugated plate material,
The outer peripheral edge (4a) on which the protrusions (5) are formed has a first region (5a) which forms the protrusions (5) and a second region (4aa) which is located in the vicinity of the first region (5a) and does not form the protrusions (5),
A cup-plate stacked type heat exchanger in which, when the inner fin (4) is deployed in a direction perpendicular to the ridge line (4b) of the wave shape, the position of the tip of the first region (5a) is aligned with the position of the tip of the second region (4aa), or the position of the tip of the first region (5a) is located inside the position of the tip of the second region (4aa).

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