JP6815966B2 - Heat exchanger - Google Patents

Description

The present invention relates to a heat exchanger.

As shown in FIGS. 19A to 19C, the heat exchanger 40 disclosed in Patent Document 1 includes a tubular peripheral wall 41 and a plurality of first portions extending inside the peripheral wall 41 in the axial direction of the peripheral wall 41. It includes a cell 43a and a partition wall 42 for partitioning into a plurality of second cells 43b. The first cell 43a has a first flow path 44 in which the inflow port 44a and the outflow port 44b are opened in the peripheral wall 41 by closing both ends in the axial direction and communicating the first cells 43a adjacent to each other in the vertical direction. Is forming. The second cell 43b forms a second flow path 45 whose both ends in the axial direction are opened as an inflow port and an outflow port. Such a heat exchanger exchanges heat between the first fluid flowing through the first flow path 44 and the second fluid flowing through the second flow path 45.

JP-A-2015-140972

By the way, the heat exchanger may be mounted on a vehicle or the like and used for heat exchange between a high-temperature fluid such as exhaust gas and a liquid fluid such as cooling water. In this case, the liquid fluid may boil in the heat exchanger. One of the factors that causes the liquid fluid to boil is the retention of the fluid in the heat exchanger. That is, there is a place where the fluid is difficult to flow in the flow path of the liquid fluid in the heat exchanger, and the fluid staying in the place is continuously heated and boils.

The present invention has been made in view of these circumstances, and an object of the present invention is to suppress the retention of a liquid fluid in a heat exchanger.

The heat exchanger of the present invention for solving the above-mentioned problems includes a tubular peripheral wall and a partition wall that divides the inside of the peripheral wall into a plurality of first cells and a plurality of second cells extending in the axial direction of the peripheral wall. A heat exchanger in which heat exchange is performed between a liquid first fluid flowing through the first cell and a second fluid flowing through the second cell, and both ends in the axial direction are sealed. The first cell row is arranged side by side in the first direction orthogonal to the axial direction, and the first cell row is arranged side by side in the axial direction of the first cell row and adjacent to each other. In addition to communicating, one end of the first direction is provided with a pair of communication portions that open to the peripheral wall as an inlet or outlet of the first fluid, and at least one of the communication portions is the above in the first direction. It is an extended communication portion provided so that the axial length gradually increases toward the side opening to the peripheral wall, and the end surface of the extended communication portion on the axial end side is oblique with respect to the axial direction. A plane that is convex toward the end in the axial direction, or a curved surface that is convex toward the end in the axial direction, and a plane that extends from the end of the curved surface in the first direction in the tangential direction of the end. It is composed of a combination surface.

When the flow path of the first fluid is formed by providing a communication portion that opens in the peripheral wall with respect to the first cell row consisting of the first cell in which both ends in the axial direction are sealed, the peripheral wall of the communication portion Since the corner of the end on the non-opening side is also a place where the flow direction of the first fluid changes significantly, retention of the first fluid is particularly likely to occur. According to the above configuration, the communication portion is an extended communication portion whose end face on the axial end side is configured to have the above-mentioned specific shape, so that the first fluid flow path has the corner portion where retention is likely to occur. The shape will be as if it had been removed, and the first fluid will flow smoothly through the extended communication section. As a result, the retention of the first fluid at the corner is suppressed, and the boiling of the first fluid in the heat exchanger is suppressed.

Regarding the heat exchanger of the present invention, the communication portion located on the upstream side in the flow direction of the second fluid is preferably the expansion communication portion.
When the second fluid has a high temperature, the portion inside the heat exchanger on the upstream side in the flow direction of the second fluid tends to become hot due to the heat of the second fluid. Therefore, the boiling of the first fluid can be suppressed more effectively by using the communication portion located on the upstream side in the flow direction of the second fluid as the expansion communication portion.

In the heat exchanger of the present invention, in the portion where the end face on the axial end side of the extended communication portion is provided, the shorter the axial length of the extended communication portion, the more the shaft of the peripheral wall and the partition wall. It is preferable that the length in the direction is short.

According to the above configuration, the heat exchanger can be miniaturized.
In the heat exchanger of the present invention, it is preferable that both the inlet and the outlet are open on the same side of the peripheral wall in the first direction.

According to the above configuration, since the inflow port and the outflow port of the first flow path are provided on the same side of the peripheral wall, the flow path member for supplying and discharging the first fluid can be attached to the same side of the peripheral wall. it can. As a result, the installation space of the heat exchanger including the flow path member can be reduced.

According to the present invention, it is possible to suppress the retention of a liquid fluid in the heat exchanger.

Perspective view of the heat exchanger. Front view of heat exchanger. FIG. 2 is a sectional view taken along line 3-3 of FIG. FIG. 2 is a sectional view taken along line 4-4 of FIG. Explanatory drawing of molding process. Explanatory drawing of the processing process (explanatory drawing of the first processing). Explanatory drawing of the processing process (explanatory drawing of the state in which the processing jig of the second processing is inserted). Explanatory drawing of the processing process (explanatory drawing after inserting the processing jig of the second processing). Explanatory drawing of degreasing process. Explanatory drawing of impregnation process. Sectional drawing of the heat exchanger of the modified example. Sectional drawing of the heat exchanger of the modified example. Sectional drawing of the heat exchanger of the modified example. Sectional drawing of the heat exchanger of the modified example. Sectional drawing of the heat exchanger of the modified example. Sectional drawing of the heat exchanger of the modified example. The schematic diagram which shows each dimension in the 1st flow path of the heat exchanger which performed the simulation. (A) to (e) are flow velocity contour diagrams by simulation. (A) is a perspective view of a heat exchanger of the prior art, (b) is a sectional view taken along line 19b-19b of (a), and (c) is a sectional view taken along line 19c-19c of (a).

Hereinafter, an embodiment of the heat exchanger will be described.
As shown in FIGS. 1 and 2, the heat exchanger 10 has a rectangular tubular peripheral wall 11 and a plurality of first cells 13 and a plurality of second cells 14 extending in the axial direction of the peripheral wall 11 inside the peripheral wall 11. It is provided with a partition wall 12 for partitioning. The rectangular tubular peripheral wall 11 has a pair of vertical side walls 11a facing each other and a pair of horizontal side walls 11b facing each other, and is configured such that the cross-sectional shape orthogonal to the axial direction of the peripheral wall 11 forms a horizontally long rectangle. ..

As shown in FIG. 2, the partition wall 12 has a cross section orthogonal to the axial direction of the peripheral wall 11 so that the partition wall 12 parallel to the vertical side wall 11a and the partition wall 12 parallel to the horizontal side wall 11b form a grid pattern. It is configured in. The cell structure formed by the partition wall 12 is not particularly limited. For example, a cross section in which the wall thickness of the partition wall 12 is 0.1 to 0.5 mm and the cell density is orthogonal to the axial direction of the peripheral wall 11. It can have a cell structure of 15 to 93 cells per 1 cm ² . Further, both end faces of the heat exchanger 10, that is, both end edges of the peripheral wall 11 and both end edges of the partition wall 12 are formed in a plane shape orthogonal to the axial direction of the peripheral wall 11.

As shown in FIGS. 3 and 4, the first cell 13 is a cell through which a liquid first fluid flows, and both ends thereof are sealed by a sealing portion 22. The second cell 14 is a cell through which a second fluid flows, and both ends thereof are open.

The liquid first fluid is not particularly limited, and for example, a known heat medium can be used. Known heat media include, for example, cooling water (Long Life Coolant: LLC) and organic solvents such as ethylene glycol. The second fluid is not particularly limited, and examples thereof include exhaust gas from an internal combustion engine.

As shown in FIG. 2, in the cross section orthogonal to the axial direction of the peripheral wall 11, the cross-sectional shape of the first cell 13 and the cross-sectional shape of the second cell 14 are all the same.
As shown in FIG. 2, the heat exchanger 10 includes a plurality of first cell rows 13a in which only the first cell 13 is arranged along the vertical side wall 11a of the peripheral wall 11. In the present embodiment, the direction parallel to the vertical side wall 11a of the peripheral wall 11 is the first direction. Hereinafter, the direction parallel to the vertical side wall 11a of the peripheral wall 11 will be referred to as the first direction.

Further, the heat exchanger 10 is located between adjacent first cell rows 13a in the direction along the lateral side wall 11b of the peripheral wall 11, and only the second cell 14 is arranged along the vertical side wall 11a. Have a row. The number of rows of the second cell row arranged between the cell rows of the adjacent first cell 13 is not particularly limited, but for example, when the second fluid is a gas such as exhaust gas of an internal combustion engine. The number of columns in the second cell column is preferably 2 or more, and more preferably 3 to 4 columns.

As shown in FIG. 3, at the end of the first cell row 13a on one side (right side in the drawing) in the axial direction, the first cells 13 are formed so as to extend in the first direction and are adjacent to each other in the first direction. An inflow side communication portion 15a is provided to communicate with the above. One end of the inflow side communication portion 15a in the first direction opens to the peripheral wall 11 (horizontal side wall 11b), and the other end of the inflow side communication portion 15a is the first cell located on the farthest side in the first direction. It has reached 13.

Further, at the end of the first cell row 13a on the other side (left side in the drawing) in the axial direction, the outflow side is formed so as to extend in the first direction and communicates with the first cells 13 adjacent to the first cell. A communication portion 15b is provided. One end of the outflow side communication portion 15b in the first direction opens to the peripheral wall 11 (horizontal side wall 11b), and the other end of the outflow side communication portion 15b is the first cell located on the farthest side in the first direction. It has reached 13.

As shown in FIG. 3, the inflow side communication portion 15a and the outflow side communication portion 15b are formed along the inner surface of the sealing portion 22 that seals both end portions of the first cell 13. The inner surface 22a of the sealing portion 22 provided at the end on one side (right side in the drawing) in the axial direction is a vertical surface orthogonal to the axial direction. Therefore, the axial length L1 of the inflow side communication portion 15a is the same length throughout the first direction.

Further, the inner surface 22b of the sealing portion 22 provided at the end on the other side (left side in the drawing) in the axial direction is an inclined surface inclined with respect to the axial direction. Therefore, the outflow side communication portion 15b has a plane in which the end surface (hereinafter referred to as the end surface 22b) on the axial end side formed by the inner surface 22b of the sealing portion 22 is oblique to the axial direction. .. As a result, the axial length L2 of the outflow side communication portion 15b is from the end of the other side of the first direction (the side that does not open to the peripheral wall 11) to the end of one side of the first direction (the side that opens to the peripheral wall 11). It gradually becomes longer toward the portion over the entire first direction. Therefore, in the present embodiment, the outflow side communication portion 15b serves as the extended communication portion. The inclination angle Θ of the end face 22b in the extended communication portion (outflow side communication portion 15b) with respect to the axial direction is preferably 95 ° or more, and more preferably 95 ° or more and 115 ° or less.

As shown in FIG. 3, the inside of the heat exchanger 10 is composed of an inflow side communication portion 15a, a first cell 13, and an outflow side communication portion 15b, and the opening of the inflow side communication portion 15a is used as an inflow port and flows out. A substantially U-shaped first flow path 17 having an opening of the side communication portion 15b as an outlet is formed in each first cell row 13a.

Further, as shown in FIG. 4, a second flow path 18 composed of a second cell 14 and having both ends in the axial direction of the peripheral wall 11 as an inlet or an outlet is formed inside the heat exchanger 10. There is. In the present embodiment, in the axial direction, the end on the side where the outflow side communication portion 15b, which is the expansion communication portion, is located is the inflow port of the second flow path 18. Then, the heat exchanger 10 having the above configuration exchanges heat between the liquid first fluid flowing through the first flow path 17 and the second fluid flowing through the second flow path 18 via the partition wall 12. be able to.

Next, the flow of the first fluid in the first flow path 17 will be described.
As shown in FIG. 3, the first fluid is supplied to the first flow path 17 in the heat exchanger 10 through the opening of the inflow side communication portion 15a. The first fluid supplied to the first flow path 17 branches to each first cell 13 that opens to the inflow side communication portion 15a side while flowing to the other side in the first direction along the inflow side communication portion 15a. It flows in.

Then, the first fluid flows in each of the first cells 13 along the axial direction, merges at the outflow side communication portion 15b, and flows to one side in the first direction along the outflow side communication portion 15b. Here, the outflow side communication portion 15b is an expansion communication portion in which the axial length L2 gradually becomes longer toward one side in the first direction (the side opening to the peripheral wall 11). Therefore, the first fluid flowing into the outflow side communication portion 15b will flow along the planar end surface 22b that is oblique to the axial direction, and will flow to the relatively wide side in the outflow side communication portion 15b. By doing so, the user is positively guided to one side in the first direction (the side open to the peripheral wall 11). Then, the first fluid flowing through the outflow side communication portion 15b to one side in the first direction is discharged to the outside of the heat exchanger 10 through the opening of the outflow side communication portion 15b.

The materials constituting the peripheral wall 11, the partition wall 12, and the sealing portion 22 of the heat exchanger 10 are not particularly limited, and materials used in known heat exchangers can be used, for example, carbide. Examples thereof include carbides such as silicon, tantalum carbide and tungsten carbide, and nitrides such as silicon nitride and boron nitride. Among these, a material containing silicon carbide as a main component is preferable because it has a higher thermal conductivity than other ceramic materials and can increase the heat exchange efficiency. Here, the "main component" is assumed to mean 50% by mass or more. Examples of the material containing silicon carbide as a main component include a material containing silicon carbide particles and metallic silicon particles.

Next, one manufacturing method of the heat exchanger of the present embodiment will be described with reference to FIGS. 5 to 10. The heat exchanger is manufactured by going through the molding step, the processing step, the degreasing step, and the impregnation step described below in this order.

(Molding process)
A clay-like mixture containing silicon carbide particles, an organic binder, and a dispersion medium is prepared as a raw material used for molding the heat exchanger. As shown in FIG. 5, this clay-like mixture is used to form a rectangular tubular peripheral wall 11 and a partition wall 12 for partitioning the inside of the peripheral wall 11 into a plurality of cells C extending in the axial direction of the peripheral wall 11. Mold the body 20. Both ends of the molded body 20 are open for all cells C. The molded body 20 can be molded by, for example, extrusion molding. The obtained molded product 20 is subjected to a drying treatment for drying the molded product 20.

(Processing process)
In the processing step, a first process of sealing both ends of some cells in the molded body and a second process of forming an inflow side communication portion and an outflow side communication portion in the molded body are performed.

As shown in FIG. 6, in the first processing, of the plurality of cells C formed in the molded body 20, the clay-like mixture used in the molding step is applied to both ends of the cells C constituting the first cell. To form a sealing portion 22 that seals both ends of the cell C. After that, the molded body 20 is subjected to a drying treatment for drying the sealing portion 22.

In the second processing, for example, by using a method of bringing a heated processing tool into contact with the molded body, a part of the peripheral wall, the partition wall, and the sealing portion in the molded body is removed, and the inflow side communication portion and the outflow side are removed. Form a communication part.

Specifically, as shown in FIG. 7, a blade-shaped processing tool 21a having an outer shape corresponding to the inflow side communication portion and a blade-shaped processing tool 21b having an outer shape corresponding to the outflow side communication portion are provided. prepare. The processing tools 21a and 21b are made of a heat-resistant metal (for example, stainless steel), and the thickness thereof is set so as not to exceed the width of the cell C. Next, the blade is heated so that the temperature at which the organic binder contained in the molded product 20 is burned out is reached. For example, when the organic binder is methyl cellulose, the blade is heated to 400 ° C. or higher.

Then, the heated processing tools 21a and 21b are inserted into the molded body 20 from one side in the first direction, and then pulled out. At this time, when the heated processing tools 21a and 21b come into contact with the molded body 20, the organic binder contained in the molded body 20 burns and burns out at the contact portion. Therefore, the insertion resistance of the processing tools 21a and 21b to the molded body 20 is very small, and when the processing tools 21a and 21b are inserted, the peripheral portion of the inserted portion is unlikely to be deformed or broken. In addition, the amount of processing waste generated is reduced by burning the organic binder.

Then, as shown in FIG. 8, the inserted processing tools 21a and 21b are pulled out to form the inflow side communication portion 15a and the outflow side communication portion 15b. The end face 22b on the axial end side of the extended communication portion (outflow side communication portion 15b) is formed by removing a part of the sealing portion 22 by contact with the processing tool 21b. A processed molded product is obtained by going through the processing steps including the first processing and the second processing described above.

(Degreasing process)
The degreasing step is a step of obtaining a degreased body from which the organic binder has been removed from the processed molded product by burning the organic binder contained in the processed molded product by heating the processed molded product. As shown in FIG. 9, by going through the degreasing step, the organic binder is removed from the processed molded product, and a degreasing body 30 having a skeleton portion arranged in a state where the silicon carbide particles are in contact with each other is obtained.

(Immersion process)
The impregnation step is a step of impregnating the inside of each wall of the degreased body with metallic silicon. In the impregnation step, the metal silicon lumps are brought into contact with the degreased body and heated to a temperature equal to or higher than the melting point of the metallic silicon (for example, 1450 ° C. or higher). As a result, as shown in FIG. 10, the molten metallic silicon enters the gaps between the particles constituting the skeleton portion of the degreased body by the capillary phenomenon, and the metallic silicon is impregnated in the gaps.

The heat treatment of the impregnation step may be performed continuously from the heat treatment of the degreasing step. For example, in a state where a mass of metallic silicon is in contact with a processed molded body, the organic binder is removed by heating at a temperature lower than the melting point of metallic silicon to form a degreased body, and then the heating temperature is set to the melting point of metallic silicon. It is raised above and the degreased body is impregnated with the molten metallic silicon.

A heat exchanger can be obtained by going through the above impregnation step.
Here, in the present embodiment, special temperature control is performed in the steps after the degreasing step. That is, in the steps after the degreasing step, the process is carried out at a temperature lower than the sintering temperature of silicon carbide contained in the mixture used in the molding step, and the processed molded body and the degreased body are kept at a temperature equal to or higher than the above sintering temperature. I try not to expose it. Therefore, in the degreasing step, heating is performed at a temperature equal to or higher than the temperature at which the organic binder can be burnt and lower than the above sintering temperature. Similarly, in the impregnation step, heating is performed at a temperature equal to or higher than the melting point of metallic silicon and lower than the above sintering temperature.

Next, the operation and effect of this embodiment will be described.
(1) The heat exchanger includes a tubular peripheral wall and a partition wall that divides the inside of the peripheral wall into a plurality of first cells and a plurality of second cells extending in the axial direction of the peripheral wall. Further, the first cell in which both ends in the axial direction are sealed is arranged side by side in the axial direction of the first cell row and adjacent to the first cell row formed in parallel in the first direction orthogonal to the axial direction. In addition to communicating the first cells with each other, one end in the first direction is provided with a communication portion (inflow side communication portion and outflow side communication portion) that opens into the peripheral wall as an inlet or outlet of the first fluid. One of the communication portions (outflow side communication portion) is an expansion communication portion provided so that the axial length gradually increases toward the side opening to the peripheral wall in the first direction, and the shaft in the expansion communication portion. The end face on the direction end side is composed of a plane that is oblique to the axial direction.

A flow path for the first fluid is formed by providing an inflow side communication portion and an outflow side communication portion that open in the peripheral wall with respect to the first cell row composed of the first cells in which both ends in the axial direction are sealed. In this case, the corner portion of the end portion on the side that does not open to the peripheral wall of the outflow side communication portion is also a portion where the flow direction of the first fluid changes significantly, so that the retention of the first fluid is particularly likely to occur.

According to the above configuration, the communication portion is an extended communication portion whose end face on the axial end side is configured to have the above-mentioned specific shape, so that the first fluid flow path has the corner portion where retention is likely to occur. The shape will be as if it had been removed, and the first fluid will flow smoothly through the extended communication section. As a result, the retention of the first fluid at the corner is suppressed, and the boiling of the first fluid in the heat exchanger is suppressed.

When the first fluid boils in the heat exchanger, the strength of the heat exchanger may decrease due to the impact of the boiling. Therefore, the life of the heat exchanger can be extended by suppressing the boiling of the first fluid in the heat exchanger. Further, since the strength required for the heat exchanger is lowered, it is possible to select the material of the heat exchanger with an emphasis on factors other than the strength such as heat exchange efficiency, and the degree of freedom in material selection is improved.

(2) The inclination angle of the end face on the axial end side of the extended communication portion with respect to the axial direction is 95 ° or more.
According to the above configuration, the retention of the first fluid can be suppressed more effectively.

(3) The inclination angle of the end face on the axial end side of the extended communication portion with respect to the axial direction is 115 ° or less.
According to the above configuration, the length of the second flow path located in the range in which the first fluid flows (the formation range of the first flow path) in the axial direction is excessive due to the provision of the extended communication portion. It can suppress shortening. As a result, it is possible to suppress a decrease in heat exchange efficiency of the heat exchanger.

(4) The communication portion located on the upstream side in the flow direction of the second fluid is an extended communication portion.
When the second fluid has a high temperature, the portion inside the heat exchanger on the upstream side in the flow direction of the second fluid tends to become hot due to the heat of the second fluid. Therefore, the boiling of the first fluid can be suppressed more effectively by using the communication portion located on the upstream side in the flow direction of the second fluid as the expansion communication portion.

(5) The communication portion having an outlet (outflow side communication portion) is an extended communication portion.
The end of the communication portion having an inflow port that does not open to the peripheral wall tends to boil due to the retention of the first fluid as compared with the end of the communication portion that has an inflow port that does not open to the peripheral wall. .. Therefore, by using the communication portion having the outlet as the expansion communication portion, boiling due to the retention of the first fluid can be suppressed more effectively.

(6) A sealing portion for sealing both ends of the first cell is provided, and an end face on the axial end side of the extended communication portion is formed by changing the axial length of the sealing portion.
According to the above configuration, the shape of the end face on the outlet side in the heat exchanger can be any shape other than the shape along the end face on the axial end side in the extended communication portion (for example, a plane orthogonal to the axial direction of the peripheral wall). Since it can be formed into a shape), the degree of freedom in designing the heat exchanger is improved.

(7) Both the inflow port and the outflow port are open on the same side (one side) of the peripheral wall in the first direction.
According to the above configuration, since the inflow port and the outflow port of the first flow path are provided on the same side of the peripheral wall, the flow path member for supplying and discharging the first fluid can be attached to the same side of the peripheral wall. it can. As a result, the installation space of the heat exchanger including the flow path member can be reduced.

(8) The partition wall contains silicon carbide as a main component. Since silicon carbide is a material having a high thermal conductivity among ceramic materials, the thermal conductivity of the partition wall can be increased. Therefore, the heat exchange efficiency of the heat exchanger can be improved.

(9) The heat exchanger of the present embodiment is manufactured under the temperature control as described above, so that the silicon carbide particles are arranged in contact with each other to form a skeleton portion, and a gap in the skeleton portion is formed. Is filled with metallic silicon to maintain its shape. That is, the silicon carbide particles do not have a bonded portion (neck) due to sintering. This makes it possible to prevent cracks in the neck between the silicon carbide particles even if strain occurs inside the partition wall due to the internal temperature difference during use of the heat exchanger. In addition, it is possible to prevent the crack from extending through the neck.

This embodiment can also be modified and implemented as follows. It is also possible to appropriately combine the configurations of the above-described embodiment and the configurations shown in the following modified examples.
-As shown in FIG. 11, both the communication portion on the outlet side and the communication portion on the inlet side may be used as the expansion communication portion. Further, only the communication portion on the inflow port side may be used as the expansion communication portion.

-As shown in FIG. 12, the outlet (opening of the communication portion on the outlet side) and the inlet (communication portion on the inflow side) may be configured to open in different directions.
As shown in FIG. 13, the extended communication portion has a curved surface such as a rounded surface whose end surface on the axial end side is convex toward the axial end side, so that the extended communication portion has an axis toward the side opening to the peripheral wall. The shape may be such that the directional length gradually increases.

As shown in FIGS. 14 and 15, the extended communication portion is formed from a curved surface such as a rounded surface in which the end surface on the axial end side is convex toward the axial end side and the end surface of the curved surface in the first direction. Since it is a combination surface with a plane extending in the tangential direction of the end portion, the shape may be such that the axial length gradually increases toward the side opening to the peripheral wall. Note that FIG. 14 is an example showing a combination surface in which a plane is located on the side that opens to the peripheral wall on the end surface on the axial end side, and FIG. 15 shows the side that opens to the peripheral wall on the end surface on the axial end side. This is an example showing a combination surface on which a curved surface is located.

-The outer shape of the heat exchanger is not particularly limited. For example, as shown in FIG. 16, the shape has an end surface 10a that follows the shape of the end surface on the axial end side of the extended communication portion by making the length of the sealing portion 22 constant in the first direction. It may be a heat exchanger. That is, in the portion where the extended communication portion is provided, the shorter the axial length of the extended communication portion, the shorter the axial length of the peripheral wall and the partition wall may be. In this case, the heat exchanger can be miniaturized.

-The communication portion located on the downstream side in the flow direction of the second fluid may be used as the extended communication portion, or both the communication portion located on the upstream side and the communication portion located on the downstream side in the flow direction of the second fluid are expanded. It may be a communication part.

-The positions of the inflow port and the outflow port of the first flow path with respect to the flow direction of the second fluid in the second flow path are not particularly limited. For example, the inflow port of the first flow path may be located on the upstream side in the flow direction of the second fluid, and the outflow port may be located on the downstream side.

-The first cell may have a different cross-sectional shape. Further, the second cell may have a different cross-sectional shape.
-The peripheral wall is not limited to a rectangular cylinder, and may be, for example, a polygonal cylinder other than a rectangular cylinder, or a cylindrical or elliptical cylinder.

-In the present embodiment, the peripheral wall and the partition wall are made of a material containing silicon carbide as a main component, but the present invention is not limited to this embodiment. Only the partition wall may be composed of a material containing silicon carbide as a main component, and the peripheral wall and the partition wall may be composed of a material other than the material containing silicon carbide as a main component.

Hereinafter, an example in which the above embodiment is further embodied will be described.
Regarding the first flow path of the heat exchanger, the flow velocity distribution of the first fluid in the first flow path in Examples 1 to 4 and Comparative Examples in which the shape of the extended communication portion was different was obtained by simulation.

(Simulation conditions)
The simulation conditions are as follows. Further, FIG. 17 shows each dimension in the first flow path of the simulated heat exchanger.

First cell shape (length A1 x width A2 x length A3): 1.2 mm x 1.2 mm x 80 mm
Number of first cells constituting the first cell row n: 24 Inlet and outlet shapes (length B1 x width B2): 10 mm x 1.2 mm
Length of inflow side communication part and outflow side communication part B3: 35mm
Section wall thickness C: 0.25 mm
Shape of extended communication portion (inclination angle Θ of the end face on the axial end side with respect to the axial direction): 125 ° (Example 1), 110 ° (Example 2), 100 ° (Example 3), 95 ° (Implementation) Example 4), 90 ° (comparative example)
Flow rate of the first fluid: 10 L / min
Simulation software: Fluent (registered trademark) (manufactured by Ansys)
(simulation result)
FIG. 18 shows a flow velocity contour diagram of the simulation result. In the flow velocity contour diagram, the flow velocity for each part is shown by the shade of color. The darker the color, the faster the flow velocity, and the lighter the color, the slower the flow velocity. The white part in the center of each flow velocity contour diagram is the partition wall.

As shown in FIG. 18E, in the case of the comparative example in which the extended communication portion is not provided (Θ = 90 °), the corner portion of the end portion of the inflow side communication portion and the outflow side communication portion that does not open to the peripheral wall. In addition, there is a portion where the first fluid stays and the flow velocity becomes significantly slow. On the other hand, as shown in FIGS. 18 (a) to 18 (d), in the cases of Examples 1 to 4 (Θ = 125 °, 110 °, 100 °, 95 °) in which the extended communication portion is provided, it is different from the comparative example. In comparison, the range of the portion where the first fluid stays in the corner portion of the outflow side communication portion is reduced. The degree of decrease increases as the inclination angle Θ of the end face on the axial end side in the extended communication portion increases. Further, the same simulation result was obtained when the shape of the end face on the axial end side in the extended communication portion was made as shown in FIGS. 13 to 15.

L1, L2 ... Axial length, 10 ... Heat exchanger, 11 ... Circumferential wall, 12 ... Partition wall, 13 ... 1st cell, 13a ... 1st cell row, 14 ... 2nd cell, 15a ... Inflow side communication part, 15b ... Outflow side communication part, 16 ... 1st flow path, 17 ... 2nd flow path, 22 ... Sealing part.

Claims (4)

A liquid first fluid flowing through the first cell, comprising a tubular peripheral wall and a partition wall that divides the inside of the peripheral wall into a plurality of first cells and a plurality of second cells extending in the axial direction of the peripheral wall. And a heat exchanger in which heat exchange is performed between the second fluid and the second fluid flowing through the second cell.
The first cell row in which both ends in the axial direction are sealed is arranged side by side in the first direction orthogonal to the axial direction.
A pair that are juxtaposed in the axial direction of the first cell row, communicate with each other, and one end of the first direction opens into the peripheral wall as an inlet or outlet of the first fluid. Equipped with a communication part of
At least one of the communication portions is an expansion communication portion provided so that the axial length gradually increases toward the side opening to the peripheral wall in the first direction.
The end face on the axial end side of the extended communication portion is
A plane that is oblique to the axial direction,
Or a curved surface that is convex toward the end in the axial direction,
Alternatively, a heat exchanger characterized in that it is composed of a combined surface of a curved surface that is convex toward the end side in the axial direction and a plane that extends from the end of the curved surface in the first direction in the tangential direction of the end. .. The heat exchanger according to claim 1, wherein the communication portion located on the upstream side in the flow direction of the second fluid is the expansion communication portion. In the portion where the end face on the axial end side of the extended communication portion is provided, the shorter the axial length of the extended communication portion, the shorter the axial length of the peripheral wall and the partition wall. The heat exchanger according to claim 1 or 2. The heat exchanger according to any one of claims 1 to 3, wherein both the inlet and the outlet are open on the same side of the peripheral wall in the first direction.