JP6807724B2 - Heat exchanger - Google Patents

Description

The present invention relates to a heat exchange device that exchanges heat between a first fluid and a second fluid.

Conventional heat exchange devices include an outer pipe, a plurality of heat transfer pipes arranged inside the outer pipe, an introduction pipe and a discharge pipe connected to the outer pipe to introduce and discharge cooling water, and an exhaust gas inlet. A heat exchanger used in an automobile EGR system is known, which includes a flange member or the like having a partition plate for partitioning the outlet and the exhaust gas (for example, Patent Document 1).

In this heat exchanger, the outer tube is composed of an upper outer case, a lower outer case, and a rear cover member. The upper outer case, the lower outer case, and the rear cover member are each formed by pressing a stainless steel plate.
Further, the heat transfer tube is composed of an upper case, a lower case, and heat radiation fins made of a combination of a plurality of parts. The upper case, the lower case, and the heat radiation fins are each formed by pressing a stainless steel plate.

In the heat exchanger having the above configuration, the cooling water flowing from the introduction pipe flows through the gap formed between the outer pipe and the plurality of heat transfer pipes and flows out from the discharge pipe. On the other hand, the exhaust gas that has flowed into the passage from the inlet flows through the linear outward path, is turned 180 degrees in the U-shaped region to make a U-turn, flows through the linear return path, and flows out from the outlet.

However, in the U-shaped region, the exhaust gas flows along the outer inner wall surface, so that the exhaust gas that has made a U-turn has a biased flow toward the outside in the return path.
Therefore, the exhaust gas does not flow uniformly in the return path, and the exhaust gas cannot be cooled efficiently.

Further, in the above heat exchanger, since the outer tube and the heat transfer tube are each formed by joining three members formed by pressing a stainless steel plate, the number of parts is large and the manufacturing process is complicated. Invite high cost.
Further, since the heat radiation fins constituting the heat transfer tube are formed by alternately forming the concave portions and the convex portions by pressing, there is a limit in narrowing the distance between the concave portions and the convex portions, that is, the distance between the fins.

Japanese Unexamined Patent Publication No. 2013-88010

An object of the present invention is to provide a heat exchange device capable of solving the above-mentioned problems of the prior art and improving the heat exchange efficiency.

The heat exchange device of the present invention includes a plurality of fins, forms a passage through which the first fluid passes through the outward path, the U-turn path, and the return path, and makes the first fluid flowing into the return path inward on the U-turn path. An outer case having a first passage unit having a directing portion to be directed and a housing portion for accommodating the first passage unit inserted from one end side and forming a passage through which a second fluid is passed in cooperation with the first passage unit. A passage that defines the inlet and outlet of the first fluid and a case cover that is connected to the opening of the outer case, and the first passage unit has a plurality of fins and linearly defines the outward path and the return path. The passage member includes a member, a header member that covers an opening on one side of the passage member and forms a U-turn path, and a flange member having a partition wall that separates the opening on the other side of the passage member into an outward path and a return path. The structure is such that two passage halves, in which a plurality of fins are integrally molded so as to have a comb-like cross section, are butted against each other .

In the heat exchange device, the directional portion may adopt a configuration in which the directional portion is formed as a protruding wall protruding from the inner wall surface of the U-turn path toward the return path.

In the heat exchange device, the protruding wall may be formed in a ridge shape extending in the width direction of the U-turn path.

In the heat exchange device, the outer case is provided in the vicinity of the introduction port provided near the opening for introducing the second fluid and the closing portion on the opposite side of the opening for leading out the second fluid. A configuration having an outlet may be adopted.

In the heat exchange device, the outer case may adopt a configuration having a case flange portion formed around an opening for abutting and connecting the flange members.

In the heat exchange device, the case cover may adopt a configuration in which the case flange portion has a cover flange portion connected by sandwiching the flange member.

In the heat exchange device, the header member may adopt a configuration in which the passage member is formed so as to be fitted inside.

In the heat exchange device, the first passage unit may adopt a configuration including a plurality of the passage members and a spacer member interposed between the plurality of passage members to define the passage of the second fluid.

In the heat exchange device, the case cover may adopt a configuration including a rapidly expanding step portion in a region near the inlet of the first fluid.

In the heat exchange device, a configuration may be adopted in which the passage area of the outward route is set to be larger than the passage area of the return route.

In the heat exchange device, the first passage unit may adopt a configuration formed by using an aluminum material.

According to the heat exchange device having the above configuration, the problems of the prior art can be solved and the heat exchange efficiency can be improved.

It is an external perspective view which shows one Embodiment of the heat exchange apparatus which concerns on this invention. It is an exploded perspective view of the heat exchange apparatus shown in FIG. It is an exploded perspective view of the 1st passage unit included in the heat exchange apparatus shown in FIG. It is sectional drawing which shows the passage of the 1st fluid and the passage of a 2nd fluid in the heat exchange apparatus shown in FIG. It is sectional drawing which shows the passage of the 2nd fluid passing between two passage members included in the 1st passage unit in the heat exchange apparatus shown in FIG. It is a schematic diagram which shows the action of the directional part (protruding wall) formed in the U-turn path of the 1st passage unit. The case cover of the heat exchange device shown in FIG. 1 is shown. FIG. 1A is a front view of the case cover as viewed from the front, and FIG. 1B is a sectional view taken along line E1-E1 in FIG. The passage member included in the first passage unit is shown, (a) is a perspective view showing a state before abutting two passage halves in which a plurality of fins are integrally molded, and (b) is a two-passage. It is a perspective view which shows the state which the half bodies are butted and joined. 8 is a front view of the outward path and the return path of the passage member shown in FIG. 8B as viewed from the front. FIG. 5 is a cross-sectional view showing a state in which the first passage unit including two passage members shown in FIG. 9 is inserted into the outer case.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 10 of the accompanying drawings.
In this embodiment, the heat exchange device M is composed of an outer case 10, a case cover 20, and a first passage unit U inserted into the outer case 10.
The first passage unit U is composed of two passage members 30, a spacer member 40, a header member 50, and a flange member 60.
Then, the first passage unit U forms a passage R1 composed of a linear outward path Gr extending in the longitudinal direction L, a U-turn path Ur, and a linear return path Cr extending in the longitudinal direction L in order to pass the first fluid. Is what you do.

The outer case 10 is formed so as to form an outer contour of a substantially rectangular parallelepiped by molding using an aluminum material or the like.
The outer case 10 includes an accommodating portion 11, an opening portion 12, a closing portion 13, a case flange portion 14, an introduction pipe 15, a lead-out pipe 16, and concave grooves 17 and 18.

The accommodating portion 11 has a substantially rectangular cross section and is formed so as to accommodate the first passage unit U.
The opening 12 has a substantially rectangular cross section and is formed so that the first passage unit U can be inserted.
The closing portion 13 is formed so as to define the passage R2 of the second fluid in cooperation with the header member 50 of the first passage unit U with the first passage unit U inserted.
The case flange portion 14 includes a contact surface 14a for abutting the flange member 60 of the first passage unit U, and six through holes 14b for passing bolts for fastening.

The introduction pipe 15 is formed in the vicinity of the opening 12 in the longitudinal direction L of the outer case 10 and in a substantially intermediate region in the width direction W, and includes an introduction port 15a for introducing the second fluid at the boundary with the accommodating portion 11. There is.
The lead-out pipe 16 is formed in the vicinity of the closing portion 13 in the longitudinal direction L of the outer case 10 and in a substantially intermediate region in the width direction W, and includes a lead-out port 16a for leading out the second fluid at the boundary with the accommodating portion 11. ing.

As described above, since the introduction port 15a of the second fluid is located near the opening 12 and the outlet 16a of the second fluid is located near the closing portion 13, the second fluid introduced from the introduction port 15a is introduced. , It can be brought close to the first fluid located on the upstream side of the outward route Gr. Further, since the outlet 16a is located at a position away from the introduction port 15a, it is possible to prevent the second fluid from flowing by a shortcut.
Therefore, the heat exchange efficiency between the first fluid and the second fluid can be increased. For example, when the first fluid is a high temperature fluid and the second fluid is a low temperature fluid, the first fluid can be cooled efficiently.

The concave groove 17 defines the passage R2 of the second fluid, extends from the opening 12 to the closing portion 13 in the longitudinal direction L of the outer case 10, and is formed in a region overlapping the introduction port 15a in the width direction W. Has been done.
The concave groove 18 defines the passage R2 of the second fluid, extends from the opening 12 to the closing portion 13 in the longitudinal direction L of the outer case 10, and is formed in a region overlapping the outlet 16a in the width direction W. Has been done.

As shown in FIG. 2, the case cover 20 is formed so as to form an outer contour of a substantially cube by molding a mold using an aluminum material or the like.
The case cover 20 includes an inlet passage 21, an outlet passage 22, a partition wall 23, a cover flange portion 24, and a step portion 25.

The inlet passage 21 is formed so as to extend in the longitudinal direction L of the outer case 10 to communicate with the outward route Gr of the first passage unit U and to define the inlet 21a of the first fluid that opens in the longitudinal direction L. ing.
The outlet passage 22 extends in the longitudinal direction L of the outer case 10 to communicate with the return path Cr of the first passage unit U, and is an outlet of the first fluid that opens in the direction perpendicular to the longitudinal direction L and the width direction W. It is formed so as to define 22a.

The partition wall 23 is formed so as to separate the inlet passage 21 and the outlet passage 22 and to be joined to the partition wall 63 of the flange member 60 included in the first passage unit U.
The cover flange portion 24 has the same contour as the case flange portion 14, and includes a contact surface 24a that abuts on the flange member 60 of the first passage unit U, and six through holes 24b through which fastening bolts are passed. ..

The step portion 25 is formed so that the passage area rapidly expands in a region near the entrance 21a, that is, in the middle of the entrance passage 21.
According to this, when the first fluid flows from the inlet 21a of the case cover 20 toward the outward route Gr of the first passage unit U, a vortex is generated in the first fluid in the region of the step portion 25, and the stirring action is performed. Can be obtained. Therefore, the flow velocity of the first fluid is reduced, and the heat exchange efficiency between the first fluid and the second fluid can be increased.

As described above, the first passage unit U is composed of two passage members 30, a spacer member 40, a header member 50, and a flange member 60, and these members are joined to each other by a predetermined joining method. As a joining method, brazing, welding, an adhesive, and other joining means are applied.

The passage member 30 is formed by abutting and joining two passage halves 31, 31 to each other.
The passage half body 31 is formed by, for example, extrusion molding using an aluminum material, and includes a plurality of (here, 27) fins 31a integrally molded at equal intervals so as to form a comb-like cross section. There is.
In this way, the passage half body 31 is extruded using an aluminum material, so that the distance between the plurality of fins 31a can be set narrow. Therefore, the heat exchange efficiency can be improved. In particular, since the aluminum material has high thermal conductivity as compared with the stainless steel material and the like, the heat exchange efficiency can be further improved.

The plurality of fins 31a include a plurality of fins having a protrusion height lower than that of the outer wall 31'and a plurality of fins having the same protrusion height as the outer wall 31'(here, indicated by fins 31a').
Then, by abutting the two passage halves 31 and 31, as shown in FIG. 9, the outer walls 31'and the fins 31a' come into contact with each other.

Here, as shown in FIG. 9, at a position deviated upward from the intermediate position, the pair of fins 31a'that abut against each other divides the outer route Gr and the return route Cr into two. That is, the passage area of the outward route Gr is set to be larger than the passage area of the return route Cr.
As described above, the passage member 30 is configured by abutting and joining two passage halves 31 and 31 having a plurality of preformed fins 31a and 31a'. Therefore, the passage member 30 can be easily formed while reducing the number of parts and simplifying the manufacturing process.

Further, as shown in FIG. 10, the first passage unit U is configured by arranging the two passage members 30 in the width direction W with the spacer member 40 interposed therebetween.
The spacer member 40 has a predetermined thickness in the width direction W, and defines the passage R2 of the second fluid between the two passage members 30 and 30.

The header member 50 is formed of an aluminum material or the like, and has an annular outer edge 51 that fits the two passage members 30 and 30 inward, and a wall surface 52 that covers an opening on one side of the two passage members 30 and 30. A projecting wall 53 as a directional portion formed so as to project from the wall surface 52 is provided.

The outer edge portion 51 is formed so as to be closely fitted to the inner wall surface of the accommodating portion 11 of the outer case 10.
The wall surface 52 is formed so as to define a U-turn path Ur that guides the first fluid from the outward path Gr to the return path Cr.
The protruding wall 53 is formed in a ridge shape that protrudes from the wall surface 52 that defines the U-turn road Ur toward the return route Cr and extends in the width direction W of the U-turn road Ur.
Further, the protruding wall 53 is formed in a region of the return route Cr and a region deviated toward the outward route Gr side.
The protruding wall 53 directs the first fluid flowing into the return path Cr toward the inward side (the side closer to the outward path Gr) in the U-turn path Ur.

By providing the protruding wall 53 as the directional portion in this way, as shown in FIG. 6, when the first fluid flows from the U-turn path Ur to the return path Cr via the outward path Gr, the first fluid flows into the return path Cr. The flow of the first fluid in the return path Cr is made uniform by being directed toward the inside of the circuit.
In particular, since the protruding wall 53 is formed in a ridge shape, it is possible to direct the first fluid so as to flow uniformly not only on the outside of the return path but also on the inside, while adopting a simple form. As a result, the heat exchange efficiency between the first fluid and the second fluid can be increased.
Therefore, when the first fluid is the exhaust gas of the engine and the second fluid is the cooling water, the exhaust gas can be efficiently cooled.

Further, since the header member 50 is formed so as to fit the passage member 30 inward, the outer wall and the outer case of the passage member 30 are positioned while the header member 50 is fitted into the accommodating portion 11 of the outer case 10 and positioned. A predetermined gap can be secured as the passage R2 of the second fluid between the inner walls of 10.

The flange member 60 is formed in a flat plate shape having the same contour as the case flange portion 14 by using an aluminum material or the like, and is joined to the openings on the other side of the two passage members 30 and 30.
The flange member 60 is fastened with a contact surface 61 that contacts the contact surface 14a of the case flange portion 14, a contact surface 62 that contacts the contact surface 24a of the cover flange portion 24, a partition wall 63, and a partition wall 64. It is provided with six through holes 65 through which bolts are passed.

The partition wall 63 is formed so as to be joined to the fins 31a'which separate the outward path Gr and the return path Cr of the two passage members 30 and 30, and to be joined to the partition wall 23 of the case cover 20.
The partition wall 64 is joined to the edge of the opening on the other side of the two passage members 30, 30 so as to block the passage R2 between the two passage members 30, 30 from the entrance passage 21 and the exit passage 22. It is formed.

Here, in the first passage unit U, the passage area of the outward route Gr is set to be larger than the passage area of the return route Cr.
Therefore, for example, when the first fluid is a high-temperature fluid and the second fluid is a low-temperature fluid, the first fluid flowing through the first passage unit U is in a state of contracting from an expanded state due to heat exchange with the second fluid. Therefore, the heat exchange efficiency can be improved while reducing the pressure loss.

Next, the assembly of the first passage unit U will be described.
The two passage members 30, the spacer member 40, the header member 50, and the flange member 60 are separately formed.
After that, the header member 50 is joined while sandwiching and joining the spacer member 40 to one side of the two passage members 30.
Subsequently, the assembly of the first passage unit U is completed only by joining the flange member 60 to the other side of the two passage members 30.
In this way, the first passage unit U can be easily formed while reducing the number of parts and simplifying the manufacturing process.

Next, the assembly of the heat exchange device M will be described.
The outer case 10, the case cover 20, and the first passage unit U are prepared.
Subsequently, the first passage unit U is inserted into the accommodating portion 11 through the opening 12 of the outer case 10. Then, the flange member 60 is brought into contact with the case flange portion 14.
Subsequently, the case cover 20 is brought close to the flange member 60 of the first passage unit U, the cover flange portion 24 is brought into contact with the flange member 60, and the flange member 60 is placed between the cover flange portion 24 and the case flange portion 14. Insert it.
In this state, bolts are passed through the through holes 24b, 65, and 14b of the case flange portion 14 of the outer case 10, the flange member 60 of the first passage unit U, and the cover flange portion 24 of the case cover 20, and screwed with the nut. ..
As a result, the assembly of the heat exchange device M is completed while positioning the first passage unit U at a predetermined position in the outer case 10.

In this way, the heat exchange device M can be easily formed while achieving reduction in the number of parts, simplification of the structure, simplification of the manufacturing process, and the like.
Further, by inserting the first passage unit U into the outer case 10 and positioning the flange member 60 of the first passage unit U in contact with the case flange portion 14 of the outer case 10, the first passage unit U and the first passage unit U are positioned. The gap formed between the outer cases 10 can be easily formed as the passage R2 of the second fluid.

Next, the operation of the heat exchange device M having the above configuration will be described.
The second fluid is introduced into the outer case 10 from the introduction port 15a of the outer case 10. Then, it is led out from the outlet 16a of the outer case 10 through the passage R2 defined by the outer case 10 and the first passage unit U.

On the other hand, the first fluid flows in from the inlet 21a of the case cover 20, passes through the inlet passage 21, and heads for the outward Gr of the passage member 30.
Here, a vortex is generated by the step portion 25 of the inlet passage 21, and the first fluid is subjected to a stirring action.
Subsequently, the first fluid flows through the outward route Gr, reaches the U-turn route Ur, is turned 180 degrees, and flows into the return route Cr.

In the region of the U-turn path Ur, the first fluid is directed toward the inside of the return path Cr by the protruding wall 53, so that the conventional flow biased to the outside is suppressed and the flow in the return path Cr is uniform. Be made.
Then, the first fluid passes through the return path Cr, passes through the outlet passage 22 of the case cover 20, and is discharged to the outside from the outlet 22a.

According to this flow process, the heat exchange efficiency between the first fluid and the second fluid can be increased, and when the first fluid is a high temperature fluid and the second fluid is a low temperature fluid, the efficiency of the first fluid is increased. Can be cooled well.
When this heat exchange device M is applied to the EGR system of an engine, the exhaust gas as the first fluid can be efficiently cooled by the cooling water as the second fluid.

In the above embodiment, the protruding wall 53 protruding from the inner wall surface of the U-turn road Ur is shown as the directional portion formed in the region of the U-turn road Ur, but the present invention is not limited to this, and the first fluid May be a separately formed straightening vane or other member as long as it directs the return path toward the inside.
In the above embodiment, the protruding wall 53 having a ridge shape is shown as the protruding wall, but the present invention is not limited to this, and a protruding wall having another form composed of a plurality of protruding walls may be adopted.

In the above embodiment, the case where two passage members 30 are adopted as the passage members constituting the first passage unit U is shown, but the present invention is not limited to this, and one passage member 30 or three The above passage member 30 may be adopted.
In the above embodiment, the outer case 10 has the case flange portion 14, the first passage unit U has the flange member 60, and the case cover 20 has the cover flange portion 24, but the present invention is limited to this. Other forms and structures may be adopted as long as they are configured to be connected and positioned with each other.

In the above embodiment, the case where a high temperature fluid is applied as the first fluid and a low temperature fluid is applied as the second fluid is shown, but the present invention is not limited to this, and conversely, the low temperature fluid and the second fluid are used as the first fluid. A high temperature fluid may be applied as.
In the above embodiment, exhaust gas is shown as the first fluid and cooling water is shown as the second fluid, but the present invention is not limited to this, and other fluids can be applied.

As described above, according to the heat exchange device of the present invention, the problems of the prior art can be solved and the heat exchange efficiency can be improved, so that it is of course applied to the EGR system of the engine. It is also useful in other heat exchangers and the like.

M Heat Exchanger 10 Outer Case R2 Second Fluid Passage W Width 11 Containment 12 Opening 13 Closure 14 Case Flange 15a Introductory Port 16a Outlet 20 Case Cover 21a Inlet 22a Outlet 23 Partition Wall 24 Cover Flange 25 Step portion U 1st passage unit R1 1st fluid passage Gr Outward route Ur U Turn path Cr Return path 30 Passage member 31 Passage half body 31'Outer wall 31a, 31a' Fin 40 Spacer member 50 Header member 52 Wall surface 53 Protruding wall (directing part) )
60 Flange members 63, 64 Partition wall

Claims (11)

It includes a plurality of fins, forms a passage through which the first fluid passes through the outward path, the U-turn path, and the return path, and has a directional portion that directs the first fluid flowing into the return path inward on the U-turn path. 1st passage unit and
An outer case having a housing portion for accommodating the first passage unit inserted from one end side and forming a passage through which the second fluid passes in cooperation with the first passage unit.
A case cover that defines the inlet and outlet of the first fluid and is connected to the opening of the outer case.
The first passage unit includes a passage member having the plurality of fins and linearly defining the outward path and the return path, and a header member that covers an opening on one side of the passage member and forms the U-turn path. A flange member having a partition wall for partitioning the opening on the other side of the passage member into the outward path and the return path.
The passage member is formed by abutting two passage halves integrally molded with the plurality of fins so as to form a comb-shaped cross section.
A heat exchange device characterized by the fact that. The directional portion is formed as a protruding wall protruding from the inner wall surface of the U-turn road toward the return road.
The heat exchange device according to claim 1. The protruding wall is formed in a ridge shape extending in the width direction of the U-turn road.
The heat exchange device according to claim 2. The outer case has an introduction port provided in the vicinity of the opening for introducing the second fluid, and a guide provided in the vicinity of the closing portion on the opposite side of the opening for leading out the second fluid. Has an exit,
The heat exchange device according to any one of claims 1 to 3, wherein the heat exchange device is characterized. The outer case has a case flange portion formed around the opening so that the flange members are brought into contact with each other.
The heat exchange device according to any one of claims 1 to 4 , wherein the heat exchange device is characterized. The case cover has a cover flange portion that is connected to the case flange portion by sandwiching the flange member.
The heat exchange device according to claim 5 . The header member is formed so as to fit the passage member inward.
The heat exchange device according to any one of claims 1 to 6 , wherein the heat exchange device is characterized. The first passage unit includes a plurality of the passage members and a spacer member interposed between the plurality of passage members to define the passage of the second fluid.
The heat exchange device according to any one of claims 1 to 7 , wherein the heat exchange device is characterized. The case cover includes a rapidly expanding step portion in a region near the entrance.
The heat exchange device according to any one of claims 1 to 8 . The passage area of the outward route is set to be larger than the passage area of the return route.
The heat exchange device according to any one of claims 1 to 9 , wherein the heat exchange device is characterized. The first passage unit is formed of an aluminum material.
The heat exchange device according to any one of claims 1 to 10 .

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