WO2019078227A1

WO2019078227A1 - Heat exchanger

Info

Publication number: WO2019078227A1
Application number: PCT/JP2018/038575
Authority: WO
Inventors: 祥啓古賀; 村田　登志朗
Original assignee: イビデン株式会社
Priority date: 2017-10-17
Filing date: 2018-10-17
Publication date: 2019-04-25
Also published as: JP6857589B2; JP2019074268A

Abstract

A heat exchanger 10 comprises a cylindrical peripheral wall 11, and a dividing wall 12 that divides the interior of the peripheral wall 11 into a plurality of first cells 13a and a plurality of second cells 13b that extend in the axial direction of the peripheral wall. In addition, the heat exchanger 10 furthermore comprises a first flow path formed by mutual communication between first cells 13a of which both axial-direction ends are sealed. The first flow path has an inflow-side opening 14a that opens to the peripheral wall 11, the inflow-side opening 14a being formed so as to have a greater width than do the first cells 13a.

Description

Heat exchanger

The present invention relates to a heat exchanger.

As shown in FIG. 18, the heat exchanger 50 of Patent Document 1 includes a cylindrical peripheral wall 51 and a plurality of first cells and a plurality of second cells 53 extending in the axial direction of the peripheral wall 51 inside the peripheral wall 51. And a dividing wall 52. The peripheral wall 51 is provided with a plurality of openings 54 communicating with the first cell, and between the liquid heat medium M flowing through the first cell through the opening 54 and the gas G flowing through the second cell 53. Heat exchange takes place.

JP, 2015-140972, A

The heat exchanger is mounted on, for example, a vehicle and is used for heat exchange between a high temperature fluid such as exhaust gas and a heat medium such as cooling water. In this case, the heat medium may be boiled in the heat exchanger. As a method of suppressing boiling of the heat medium in the heat exchanger, it is conceivable to reduce the flow resistance of the heat medium flowing in the heat exchanger to make it difficult for the heat medium to stay in the heat exchanger.

The present invention has been made in view of these circumstances, and its object is to reduce the flow resistance of a fluid such as a heat medium flowing in the heat exchanger.

A heat exchanger according to the present invention for solving the above problems comprises: a cylindrical peripheral wall; and a partition wall for dividing 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 for performing heat exchange between a liquid first fluid flowing in the first cell and a second fluid flowing in the second cell, the heat exchanger having an axial direction The first flow path further includes a first flow path in which the first cells whose both ends are sealed are in communication with each other, and the first flow path has an inflow side opening and an outflow side opening opened in the peripheral wall, At least one of the inflow side opening and the outflow side opening is formed wider than the first cell.

According to the above configuration, at least one of the inflow side opening and the outflow side opening is formed wider than the first cell, so that the flow resistance when the first fluid flows into the narrow first flow path. And at least one of the flow resistances when the first fluid is discharged from the narrow first flow path. Thereby, the inflow of the first fluid into the first channel and the discharge of the first fluid from the first channel are efficiently performed, and the flow resistance of the first fluid in the first channel is reduced. Do. As a result, retention of the first fluid in the first flow passage can be suppressed, and boiling of the first fluid in the first flow passage can be suppressed.

In the heat exchanger according to the present invention, at least one of the inflow side opening and the outflow side opening formed wider than the first cell is a widening part gradually widening toward the outer surface side of the peripheral wall Preferably,

According to the above configuration, the first fluid flows smoothly through the inflow side opening and the outflow side opening, and the flow resistance of the first fluid in the first flow path is more effectively reduced.
In the heat exchanger of the present invention, the ratio (W1 / W2) of the width (W1) of the maximum width portion to the width (W2) of the minimum width portion in the widening portion is 1.5 to 3.5, and A ratio ((W1) of the difference (W1-W2) between the width (W1) of the major part and the width (W2) of the minimum width part and the distance (D) between the maximum width part and the minimum width part It is preferable that -W2) / D) be 0.5 to 2.1.

According to the above configuration, the shape of the widening portion is suitable for reducing the flow resistance of the first fluid.
The heat exchanger of the present invention may further include a flow passage portion for supplying and discharging the first fluid to the first cell, the flow passage portion being an inflow space communicating with the inflow side opening portion and A partition for partitioning the outflow space communicating with the outflow side opening to the outer peripheral side of the peripheral wall; an introduction passage communicating with the inflow space to supply the first fluid to the inflow space; It is preferable to provide a discharge path which is communicated and discharges the first fluid from the outflow space.

According to the above configuration, the first fluid can be efficiently supplied / discharged to / from the first fluid.
In the heat exchanger according to the present invention, the inflow space of the flow passage is provided across the plurality of the inflow side openings, and the outflow space of the flow passage is in the range of the plurality of outflow openings. Is preferably provided.

According to the above configuration, the inflow space and the outflow space are formed across the plurality of the inflow side openings and the outflow side openings. An arrangement in which the widths of the inflow side opening and the outflow side opening are wide is particularly effective in this aspect. Moreover, compared with the aspect in which the inflow space and the outflow space were separately provided with respect to several opening part, the structure of a flow-path part can be simplified.

According to the present invention, the flow resistance of the fluid flowing in the heat exchanger can be reduced.

The disassembled perspective view of a heat exchanger. 2-2 line sectional drawing of FIG. Line 3-3 in FIG. 1 sectional drawing. 4 is a cross-sectional view taken along line 4-4 of FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. (A), (b) is a fragmentary sectional view of an inflow side opening. Explanatory drawing of a formation process. Explanatory drawing of a process process (explanatory drawing of the state in which the process jig | tool of 1st process was inserted in the molded object). Explanatory drawing of a manufacturing process (explanatory drawing after inserting the processing jig | tool of 1st process into a molded object, and pulling out). Explanatory drawing of a manufacturing process (explanatory drawing of 2nd process). Explanatory drawing of a manufacturing process (explanatory drawing of 3rd process). Explanatory drawing of a degreasing process. Explanatory drawing of an impregnation process. The fragmentary sectional view of the inflow side opening of the example of change. The fragmentary sectional view of the inflow side opening of the example of change. Explanatory drawing of the manufacturing process of a modification. Explanatory drawing of the processing process of the example of a change. The perspective view of the heat exchanger of prior art.

Hereinafter, an embodiment of a heat exchanger will be described.
As shown in FIGS. 1 and 2, the heat exchanger 10 of the present embodiment includes a rectangular cylindrical peripheral wall 11, a plurality of first cells 13 a extending in the axial direction of the peripheral wall 11 inside the peripheral wall 11, and a plurality of second cells. And a partition wall 12 that partitions the cell 13b. The rectangular cylindrical peripheral wall 11 has a pair of horizontal side walls 11a opposed to each other and a pair of vertical side walls 11b opposed to 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. It is done.

As shown in FIG. 2, the partition wall 12 includes a first partition wall 12a parallel to the lateral sidewall 11a, and a second partition wall 12b connecting the first partition walls 12a and parallel to the vertical sidewall 11b. In a cross section orthogonal to the axial direction of the peripheral wall 11, a rectangular cell is formed. The cell structure formed by the partition wall 12 is not particularly limited. For example, the wall thickness of the partition wall 12 is 0.1 to 0.5 mm, and the cell density is a cross section orthogonal to the axial direction of the peripheral wall 11 The cell structure can be 15 to 93 cells per 1 cm ² .

As shown in FIGS. 2 and 3, the heat exchanger 10 includes a plurality of first cell rows 16a in which only the first cells 13a are arranged in parallel to the vertical side wall 11b of the peripheral wall 11 and a second cell parallel to the vertical side wall 11b. And a plurality of second cell strings 16b in which only 13b is arranged. In the present embodiment, four second cell rows 16 b are arranged between the adjacent first cell rows 16 a, and an arrangement pattern in which this arrangement is repeated is formed.

Although the number of rows of the second cell row 16b arranged between the adjacent first cell rows 16a is not particularly limited, it is set according to the number ratio of the first cell 13a and the second cell 13b. be able to. For example, the number ratio (first cell 13a: second cell 13b) is preferably 1: 3 to 1: 6, and more preferably 1: 4 to 1: 5. Therefore, the number of rows of the second cell row 16b disposed between the adjacent first cell rows 16a is preferably 3 to 6 and more preferably 4 to 5.

As shown in FIG. 4, the first cell 13 a is a cell for circulating a heat medium as a liquid first fluid, and both ends thereof are sealed by the sealing portion 15. As shown in FIG. 5, the second cell 13b is a cell for passing a gas to be treated as a second fluid, and both ends thereof are open. The heat medium is not particularly limited, and a known liquid heat medium can be used. As a well-known heat medium, organic solvents, such as cooling water (Long Life Coolant: LLC) and ethylene glycol, are mentioned, for example. Examples of the gas to be treated include exhaust gas of an internal combustion engine.

As shown in FIGS. 3 and 4, in the heat exchanger 10, the first cell row 16a is provided with a communicating portion formed to extend in the vertical direction which is a direction along the vertical side wall 11b, The part penetrates the first partition walls 12a that partition the first cells 13a adjacent to each other in the vertical direction, and allows the cells that form the first cell row 16a to communicate with each other. The end on one side (upper side in the drawing) of the communicating portion in the vertical direction opens to the peripheral wall 11 (horizontal side wall 11a), and the end on the other side (lower side in the drawing) is the other in the vertical direction It reaches up to the first cell 13a located on the side. That is, the communication parts are all open on the same surface of the peripheral wall 11, and each communication part extends to the first cell 13a located farthest from the opening of the communication part.

As shown in FIG. 4, the heat exchanger 10 exchanges heat with the first communicating portion 17 a provided on the side of the first end 10 a which is one end of the heat exchanger 10 in the axial direction as the communicating portion. And a second communicating portion 17b provided on the second end 10b side which is the other end in the axial direction of the vessel 10. The opening 14 of the peripheral wall of the first communication portion 17a is the first opening 14a, and the opening 14 of the peripheral wall of the second communication portion 17b is the second opening 14b. Then, a first flow passage 18 constituted of the first cell 13a, the first communication portion 17a and the second communication portion 17b is formed in the heat exchanger 10, and the first opening 14a and the second flow portion 18 are formed. The openings 14b function as an inlet or an outlet of the first flow passage 18, respectively.

As shown in FIGS. 1 and 3, the first opening 14 a and the second opening 14 b are formed wider than the first cells 13 a constituting the first cell row 16 a. In the present embodiment, since the first opening 14a and the second opening 14b have the same shape, in the following, the first opening 14a will be described, and a specific description of the second opening 14b will be omitted. Do.

As shown in FIGS. 6 (a) and 6 (b), the first opening 14a is configured to have a width 2-3 times the width of the first cell 13a (a width of 2 to 3 cells). ing. More specifically, the first opening 14a is provided with a widening portion 14c which gradually widens toward the outer surface side of the peripheral wall 11, and the width of the first opening 14a is widened via the widening portion 14c. There is.

As shown in FIG. 6A, for the first opening 14a located in the first cell row 16a in which the second cell row 16b is disposed on both sides, the widenings are made at both of the edges parallel to the axial direction. 14c is provided. Further, as shown in FIG. 6B, an edge parallel to the axial direction of the first opening 14a located in the first cell row 16a in which the second cell row 16b is disposed only on one side of both sides The widening portion 14c is provided only at the edge of the portion where the second cell row 16b is disposed.

The shape of the widened portion 14c is not particularly limited, but the ratio (W1 / W2) of the width (W1) of the maximum width portion to the width (W2) of the minimum width portion in the widened portion 14c is 1.5 to 3.5. Is preferred. In addition, the ratio (W1) of the difference (W1-W2) between the width (W1) of the maximum width portion and the width (W2) of the minimum width portion to the distance (D) between the maximum width portion and the minimum width portion It is preferable that -W2) / D) be 0.5 to 2.1. If the shape of the widened portion 14c is within the above numerical range, the shape of the widened portion 14c is preferable in order to reduce the flow resistance of the heat medium. For the first opening 14a as shown in FIG. 6A, the ratio (W1 / W2) is 2.0 to 3.5, and the ratio ((W1-W2) / D) is 1.0 to 2 The ratio (W1 / W2) of the first opening 14a as shown in FIG. 6 (b) is preferably 1.5 to 2.3, and the ratio ((W1-W2) / It is preferable that D) is 0.5 to 1.1.

Further, as shown in FIG. 5, a second flow passage 19 configured of the second cell 13 b is formed in the heat exchanger 10, and the first end 10 a and the second end of the peripheral wall 11 are formed. Each 10 b functions as an inlet or an outlet of the second flow passage 19. The heat exchanger 10 configured as described above exchanges heat between the liquid heat medium (first fluid) flowing in the first flow passage 18 and the second fluid flowing in the second flow passage 19 via the partition wall 12. It can be performed.

As shown in FIG. 1, at one side of the lateral side wall 11a, there is provided a flow path portion 20 which is disposed so as to cover the entire lateral side wall 11a and which supplies and discharges the heat medium to the first cell 13a. The flow passage portion 20 includes a dividing portion 21 which divides a predetermined space on the outer peripheral side of the peripheral wall. The partition portion 21 is a short side wall portion erected in the thickness direction of the upper wall portion 22 from the rectangular plate-shaped upper wall portion 22 and the edge portion on the short side and the long side of the upper wall portion 22. And 23a and a long side wall portion 23b. Further, the partition portion 21 has a partition wall 23c, and the partition wall 23c is erected from the central portion of the upper wall portion 22 in the thickness direction of the upper wall portion 22, and connects the long side wall portions 23b. The partition wall 23c is a space surrounded by the upper wall 22, the short side wall 23a, and the long side wall 23b in the partition 21 as a first space S1 located on one short side wall 23a side and the other short side wall It divides into the 2nd space S2 located in the part 23a side.

As shown in FIGS. 1 and 4, the first space S1 is positioned on the outer peripheral side of the peripheral wall 11 so as to straddle the plurality of first openings 14a, and the second space S2 is formed in the plurality of second openings 14b. It is located in the outer peripheral side of the surrounding wall 11 so that it may straddle. Therefore, the dividing portion 21 of the flow path portion 20 divides the first space S1 communicating with the first opening 14a and the second space S2 communicating with the second opening 14b on the outer peripheral side of the peripheral wall 11.

Further, the flow passage portion 20 has a first pipe portion 24 a and a second pipe portion 24 b as pipe portions connected to the upper wall portion 22 of the partition portion 21. The first pipe portion 24 a is provided closer to the one short side wall portion 23 a than the partition wall 23 c of the upper wall portion 22, and forms a flow path communicating with the first space S 1 inside thereof. The second pipe portion 24 b is provided closer to the other short side wall portion 23 a than the partition wall 23 c of the upper wall portion 22, and forms a flow path communicating with the second space S 2 in the inside thereof. The first pipe portion 24 a and the second pipe portion 24 b are provided in a state of projecting to the outside of the flow path portion 20.

As shown in FIGS. 2 to 5, with the flow passage portion 20 positioned on the peripheral wall 11 of the heat exchanger 10, the tip portions of the short side wall portion 23 a, the long side wall portion 23 b and the partition wall 23 c with respect to the peripheral wall 11 It is fixed integrally. The first space S1 functions as an inflow space for causing the heat medium supplied from the introduction passage in the first pipe portion 24a to flow into the first flow path 18, and the second space S2 is a first flow path 18 Functions as an outflow space for discharging the heat medium having flowed out from the exhaust passage in the second pipe portion 24b.

The material which comprises the rectangular-cylindrical surrounding wall 11 of the heat exchanger 10, the division wall 12, and the flow-path part 20 is not specifically limited, The material used for a well-known heat exchanger can be used, for example And carbides such as silicon carbide, 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 high thermal conductivity and high heat exchange efficiency as compared with other ceramic materials. Here, "main component" means 50 mass% or more. Examples of the material containing silicon carbide as a main component include materials containing silicon carbide particles and metal silicon.

Next, one manufacturing method of the heat exchanger of the present embodiment will be described based on FIGS. The heat exchanger is manufactured by sequentially passing through a forming process, a processing process, a degreasing process, and an impregnating process described below.

(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 forming the heat exchanger. The clay-like mixture is used to form a compact 30 shown in FIG. The molded body 30 includes a substantially rectangular cylindrical peripheral wall 11 and a dividing wall 12 which divides the inside of the peripheral wall 11 into a plurality of cells C extending in the axial direction of the peripheral wall 11. Both ends of the cell C contained in the molded body 30 are open.

Further, on one surface of the outer surface of the peripheral wall 11 of the molded body 30, a groove portion 31 having a cross-sectional shape equal to that of the widening portion is formed to extend in the axial direction over the entire axial direction of the peripheral wall 11. The groove becomes a first opening and a second opening in a later processing step. The formed body 30 having the groove 31 can be formed, for example, by extrusion. The resulting formed body 30 is subjected to a drying process to dry the formed body 30.

(Processing process)
In the processing step, the first processing for forming the first communication portion 17a and the second communication portion 17b in the molded body 30, and the sealing of both end portions of the first cell 13a in the molded body 30, and partially filling the groove portion 31 The second processing and the third processing for arranging the flow path portion 20 in the molded body 30 are performed.

As shown in FIG. 8, in the first processing, for example, a part of the peripheral wall 11 and the first partition wall 12 a in the molded body 30 is removed using a method of bringing the heated processing tool 32 into contact with the molded body 30. Thus, the first communication portion 17a and the second communication portion 17b are formed.

Specifically, as shown in FIG. 8, a blade having an outer shape corresponding to the first communication portion 17 a and the second communication portion 17 b is prepared as the processing tool 32. This blade is formed of a heat resistant metal (for example, stainless steel), and its thickness is set to a thickness not exceeding the width of the cell C. Next, the blade is heated to a temperature at which the organic binder contained in the molded body 30 is burned off. For example, when the organic binder is methyl cellulose, the blade is heated to 400 ° C. or higher. Then, at the position of the bottom surface of the groove 31 in the peripheral wall 11, the blade is inserted from the peripheral wall 11 from the outer side in the circumferential direction.

As shown in FIG. 9, after the heated blade is inserted into the molded body 30 from the outer side in the circumferential direction, the first communication portion 17a and the second communication portion 17b are formed by pulling out the same. At this time, when the heated blade and the molded body 30 come into contact with each other, the organic binder contained in the molded body 30 is burned and burned off at the contact portion. Therefore, the insertion resistance of the blade with respect to the molded body 30 is very small, and when the blade is inserted, deformation or breakage hardly occurs in the peripheral portion of the inserted portion. In addition, burning off the organic binder reduces the amount of processing waste generated.

As shown in FIG. 10, in the second processing, the clay-like mixture used in the forming step is applied to both end portions of the cells constituting the first cell 13a among the plurality of cells formed in the formed body 30. It fills up and forms the sealing part 15 which seals the both ends of the said cell. In addition, the clay-like mixture used in the molding step is filled in a portion of the groove 31 of the molded body 30 where the first communication portion 17a and the second communication portion 17b are not formed, and the groove 31 is partially formed. fill in. As a result, the first opening 14 a and the second opening 14 b are formed as portions where the groove 31 is not filled in the peripheral wall of the molded body 30. Then, the drying process which dries the mixture with which the molded object 30 of sealing part 15 grade | etc., Was filled is performed.

As shown in FIG. 11, in the third processing, the flow path 20 as shown in FIG. 1 is separately formed using the clay-like mixture used in the forming step, and the flow path 20 is formed into a predetermined shape of the molded body 30. Place in the position of.

A processed formed body is obtained through the processing steps including the first processing, the second processing and the third processing. The order of the first processing and the second processing is not particularly limited, and the first processing may be performed after the second processing.

(Degreasing process)
In the degreasing step, the processed and formed body is heated to burn off the organic binder contained in the formed and formed body. Thus, a degreased body from which the organic binder has been removed from the processed and formed body is obtained. As shown in FIG. 12, the degreased body 40 obtained by removing the organic binder from the processed and formed body through the degreasing step has a skeleton portion in which particles of silicon carbide are arranged in contact with each other.

(Impregnation process)
In the impregnation step, metal silicon is impregnated into the interior of each wall constituting the degreased body. In the impregnation step, heating is performed to a temperature above the melting point of metal silicon (for example, 1450 ° C. or more) in a state where a mass of metal silicon is in contact with the degreased body. As a result, as shown in FIG. 13, the molten metal silicon enters into the gaps between the particles constituting the skeleton of the degreased body by capillary action, and the metal silicon is impregnated in the gaps. The metallic silicon is also impregnated into the boundary between the peripheral wall of the degreased body and the flow passage, whereby the boundary disappears, and the peripheral wall and the flow passage are integrated. As a result, the flow path portion is integrally fixed to the peripheral wall.

The heat treatment in the impregnation step may be performed continuously from the heat treatment in the degreasing step. For example, in a state in which 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 the melting point of metallic silicon The molten metal silicon may be impregnated into the degreased body by raising it above.

A heat exchanger is obtained by passing through the above-mentioned impregnation process.
Here, in the present embodiment, special temperature control is performed in steps after the degreasing step. That is, the steps after the degreasing step are carried out at a temperature lower than the sintering temperature of silicon carbide contained in the mixture used in the forming step, and the processed formed body and the degreased body are not exposed to temperatures higher than the above sintering temperature. I have to. 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 burned off and lower than the sintering temperature. Similarly, in the impregnation step, heating is performed at a temperature equal to or higher than the melting point of metal silicon and lower than the sintering temperature.

Next, the operation of the present embodiment will be described.
As shown in FIG. 4, when the heat medium is supplied to the first pipe portion 24a of the flow path portion 20, the heat medium flows through the first space S1 (inflow space) to the respective first openings 14a (inflow side). It flows into each first flow passage 18 from the opening). Then, the heat medium passes through the inside of the first flow passage 18, and flows out from the respective second openings 14b (outflow side opening) to the second space S2 (outflow space), and the second space S2 (outflow space) ) Is discharged from the second pipe portion 24b.

Here, as shown in FIGS. 6A and 6B, the first opening 14a (inflow side opening) and the second opening 14b (outflow side opening) constitute the first cell row 16a. It is formed wider than the first cell 13a. Thus, the flow resistance when the heat medium flows from the wide first space S1 (inflow space) to the narrow first flow path 18, and the heat medium from the narrow first flow path 18 to the wide second space S2 (outflow space) Flow resistance is reduced when In addition, the first opening 14 a and the second opening 14 b are provided with the widening portion 14 c that gradually widens toward the outer surface side of the peripheral wall 11, whereby the first opening 14 a and the second opening The heat medium flows smoothly through 14b. As a result, the inflow of the heat medium to the first flow path 18 and the discharge of the heat medium from the first flow path 18 are efficiently performed, and the flow resistance of the heat medium in the first flow path 18 becomes Decrease.

Next, the effects of the present embodiment will be described.
(1) The heat exchanger includes a cylindrical 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. In addition, the heat exchanger further includes a first flow path in which the first cells whose both axial ends are sealed communicate with each other. The first flow path has a first opening and a second opening that open in the peripheral wall, and the first opening and the second opening are formed wider than the first cell.

According to the above configuration, the flow resistance of the heat medium in the first flow path is improved by efficiently performing the inflow of the heat medium to the first flow path and the discharge of the heat medium from the first flow path. Decrease. As a result, retention of the heat medium in the first flow path can be suppressed, and boiling of the heat medium in the first flow path can be suppressed.

When the heat medium boils in the heat exchanger, the shock of the boiling may lower the strength of the heat exchanger. Therefore, by suppressing the boiling of the heat medium in the heat exchanger, it is possible to prolong the life of the heat exchanger. In addition, since the strength required of the heat exchanger is lowered, it is also possible to select the material of the heat exchanger by placing importance on factors other than the strength such as heat exchange efficiency, and the degree of freedom of material selection is improved.

(2) The first opening and the second opening include widening portions that gradually widen toward the outer surface side of the peripheral wall.
According to the above configuration, the heat medium flows smoothly through the first opening and the second opening, and the flow resistance of the heat medium in the first flow path is more effectively reduced.

(3) The ratio (W1 / W2) of the width (W1) of the maximum width portion to the width (W2) of the minimum width portion in the widening portion is 1.5 to 3.5, and the width (W1) of the maximum width portion And the difference (W1-W2) between the width (W2) of the minimum width portion and the distance (D) between the maximum width portion and the minimum width portion ((W1-W2) / D) is 0.5 It is -2.1.

According to the above configuration, the shape of the widened portion is suitable for reducing the flow resistance of the heat medium.
(4) The first space of the flow path portion is provided across the plurality of first openings, and the second space of the flow path portion is provided across the plurality of second openings.

According to the above configuration, the first space (inflow space) and the second space (outflow space) are configured to be large by providing the first space and the second space across the plurality of first openings and the second openings. It becomes the mode which was done. An arrangement in which the widths of the first and second openings are increased is particularly effective in this aspect. Moreover, compared with the aspect which provided 1st space (inflow space) and 2nd space (outflow space) separately with respect to several opening part, the structure of a flow-path part can be simplified.

(5) The flow path portion is integrated with the peripheral wall.
According to the above configuration, it is easy to arrange the flow path portion at an accurate position as compared with the aspect in which the flow path portion and the peripheral wall are separately configured. Moreover, it can suppress that a heat carrier leaks out from a boundary part of a channel part and a peripheral wall.

(6) Both the first opening and the second opening are open on the same side of the peripheral wall.
According to the above configuration, the flow passage portion for supplying the heat medium to the first flow passage and the flow passage portion for discharging the heat medium from the first flow passage can be provided on the same side of the peripheral wall. Thereby, reduction of the installation space of the heat exchanger including a channel part can be aimed at.

(7) The heat exchanger according to the present embodiment is manufactured under the above-described temperature control, so that the particles of silicon carbide are arranged in contact with each other to form a skeletal portion, and the gaps in the skeletal portion Is filled with metallic silicon and the shape is maintained. That is, the particles of silicon carbide do not have a joint (neck) due to sintering. Thereby, during use of the heat exchanger, it is possible to suppress the occurrence of cracks in the neck between the particles of silicon carbide, even if strain occurs inside the section wall due to the temperature difference inside. Moreover, it can suppress that a crack extends via a neck.

The present embodiment can be implemented with the following modifications. Moreover, it is also possible to implement combining suitably the structure shown to the structure of the said embodiment, and the following modification.
In the above embodiment, both the first opening and the second opening are formed wider than the first cell, but only one of the first opening and the second opening is larger than the first cell. It may be formed wide. From the viewpoint of effectively reducing the flow resistance of the heat medium in the first flow path, it is preferable to make the opening functioning as the inflow side opening wider than the first cell.

In the inflow side opening and the outflow side opening located in the first cell row in which the second cell row is disposed on both sides, the widened portion may be provided only on one side of the edge parallel to the axial direction. In addition, for the inflow side opening and the outflow side opening located in the first cell row in which the second cell row is disposed on only one side of both sides, widening portions are provided in both of the edges parallel to the axial direction It may be In the case where the widening portion is provided at the edge on the side where the second cell row is not disposed, for example, the peripheral wall may be formed thick in consideration of the width of the widening portion.

The shape of the widening portion which gradually widens toward the outer surface side of the peripheral wall is not limited to the shape of the above embodiment. For example, as shown in FIG. 14, it may be R-chamfered. Moreover, as shown in FIG. 15, it may be configured to have a plurality of C-chamfered portions (portions chamfered at an angle of 45 degrees) and gradually expand in diameter. Also in these cases, it is preferable that the ratio (W1 / W2) and the ratio ((W1-W2) / D) be in the above range.

The first opening and the second opening may be open in different directions in the peripheral wall.
The second fluid flowing through the second cell is not limited to the gas. A liquid may be passed through the second cell as the second fluid.

-In this embodiment, although a channel part and peripheral wall were impregnated with metallic silicon, and were unified, a method of unification is not limited to the above-mentioned method. For example, the boundary portion between the flow passage portion and the peripheral wall may be joined with an adhesive or the like.

-In this embodiment, although a channel part was united with a peripheral wall, it may be constituted separately. For example, the flow path portion may be prepared as a separate member, and may be disposed via a packing between the flow path portion and the peripheral wall. In this case, the material of the flow passage portion is not limited to the ceramic material, and may be made of a metal material such as stainless steel. In addition, the heat exchanger may not include the flow path portion as its configuration.

-In this embodiment, while having a common 1st space to a plurality of 1st openings, a channel part had a common 2nd space to a plurality of 2nd openings, It is not limited to this aspect. The plurality of first spaces may be individually provided for the plurality of first openings, and the plurality of second spaces may be individually provided for the plurality of second openings.

The first space and the second space may be divided by separate divisions. That is, the flow path part which distribute | circulates the 1st fluid may be arrange | positioned separately by the 1st space side and the 2nd space side.

The peripheral wall is not limited to a rectangular cylindrical shape. It may be configured in a cylindrical shape or a cylindrical shape having an elliptical cross section. Further, the shape of the cell is not limited to the rectangular cross section. It may be a polygonal shape other than a rectangular shape, or may be circular or elliptical. The corners of the polygonal shape may be chamfered. The shapes of the cells may be different between the first cell and the second cell.

-In the said embodiment, although the dimension in the axial direction of a surrounding wall was comprised longer than the dimension in the direction orthogonal to the axial direction of a surrounding wall, a heat exchanger is not limited to this aspect. The dimension in the axial direction of the peripheral wall may be shorter than the dimension in the direction orthogonal to the axial direction of the peripheral wall, or may be configured to have the same length. Regardless of the size of the heat exchanger, the partition part of the flow channel part is provided on the outer peripheral side of the peripheral wall so as to partition the inflow space and the outflow space of the heat medium.

-About the manufacturing method of a heat exchanger, the method of forming a 1st opening part and a 2nd opening part wider than a 1st cell is not limited to the method of the said embodiment.
For example, the process of partially filling the groove 31 in the second process of the process is omitted. Then, as shown in FIG. 16, in the third processing of the processing step, a protrusion 23d having the same shape as the cross-sectional shape of the groove 31 is formed for the short side wall 23a and the partition wall 23c in the flow path 20 The flow passage 20 is disposed with respect to the molded body 30 so that the protrusion 23 d is positioned in the groove 31. Thus, it is possible to form the first opening and the second opening in which the groove 31 is partitioned by the projection 23 d.

Further, as shown in FIG. 17, after forming a rectangular solid body 30 a without the groove portion 31, a part (two-dot chain line portion) of the peripheral wall of the molded body 30 is cut, and clay used in the forming step The first opening and the second opening can also be formed by stuffing the mixture in the shape of a square or the like to adjust the shape of the cut portion.

Hereinafter, the example which further actualized the said embodiment is described.
Example 1
First, a mixture of the following composition was prepared.

Particles of silicon carbide with an average particle diameter of 15 μm (large particles): 52.5 parts by mass Particles of silicon carbide with an average particle diameter of 0.5 μm (small particles): 23.6 parts by mass Methylcellulose (organic binder): 5.4 mass Part Glycerin (lubricant): 1.1 parts by mass Polyoxyalkylene compound (plasticizer): 3.2 parts by mass Water (dispersion medium): 11.5 parts by mass The mixture shown in FIG. 7 Similar to the above, the vertical 35 mm, the horizontal 94 mm, the length 80 mm, the peripheral wall thickness 0.3 mm, the partition wall thickness 0.25 mm, the cell width 1.2 mm, the width of the widening portion (FIG. A compact having a dimension W1) of 3.0 mm and a width of the widening portion (dimension W1 shown in FIG. 6B) 2.1 mm was molded.

Next, a plate-like jig heated to 400 ° C. was inserted into the peripheral wall of the molded body to form a first communication portion and a second communication portion. Also, using a clay-like mixture having the same composition as the above mixture, predetermined cells were sealed to prepare a processed and formed article having a first cell and a second cell.

By extruding and pressing the above mixture as a compartment, a molded body 94 mm wide, 80 mm long, 10 mm high, 3 mm thick, 14 mm inside diameter of pipe, 17 mm outside diameter is fabricated and processed. It arrange | positioned at the communication part formation surface side of a molded object.

Next, the processed and formed body in which the compartments are arranged is heated at 450 ° C. for 5 hours to obtain a degreased body from which the organic binder is removed. Then, in the state which mounted the board | plate material of metal silicon on the degreasing body, metal silicon was impregnated by heating at 1550 degreeC under vacuum for 7 hours, and the heat exchanger of Example 1 was obtained. The ratio (W1 / W2) in the heat exchanger of Example 1 is "2.5" and "1.75", and the ratio ((W1-W2) / D) is "1.2" and "0. .6 ".

(Example 2)
Regarding the molded product, the width of the widened portion (dimension W1 shown in FIG. 6 (a)) is 4.2 mm, and the width of the widened portion (dimension W1 shown in FIG. 6 (b)) is 2.7 mm. The heat exchanger of Example 2 was obtained in the same manner as Example 1. The ratio (W1 / W2) in the heat exchanger of Example 2 is "3.5" and "2.25", and the ratio ((W1-W2) / D) is "2.0" and "1. .0 ".

(Comparative example 1)
The heat exchanger of Comparative Example 1 was obtained in the same manner as in Example 1 except that the formed body was shaped to have no widening portion (formed body as shown in FIG. 17).

(Water flow resistance evaluation)
With respect to the heat exchangers of Examples 1 and 2 and Comparative Example 1, pipes for introducing and discharging the cooling water are installed at the respective inlets and outlets, and a sealing material is provided between the heat exchangers and the outer periphery The heat exchanger was inserted into the case via. Then, while introducing a cooling water of 40 ° C. from the inlet into the first cell at a flow rate of 10 L / min for each heat exchanger, a high temperature gas of 400 ° C. is introduced into the second cell at a flow rate of 10 g / sec The pressure difference between before and after the introduction of the heat exchanger for the cooling water was measured with a differential pressure gauge. The results are shown in Table 1.

As shown in Table 1, the first opening and the second opening are formed wider than the first cell, so that the cooling water (heat medium) is formed of the first cell from the inflow space. The flow resistance is reduced when supplied to the flow path and when the cooling water (heat medium) is discharged from the first flow path to the outflow space, and the flow resistance of the cooling water (heat medium) in the first flow path Becomes smaller.

D: distance between the maximum width portion and the minimum width portion, S1: first space, S2: second space, W1: width of the maximum width portion, W2: width of the minimum width portion, 10: heat exchanger, 11: Peripheral wall, 12: partition wall, 13a: first cell, 13b: second cell, 14a: first opening, 14b: second opening, 14c: widening portion, 16a: first cell row, 16b: second cell Column, 17a: first communication portion, 17b: second communication portion, 18: first flow path, 19: second flow path, 20: flow path portion, 21: partition portion.

Claims

A liquid first fluid flowing in the first cell, comprising: a cylindrical peripheral wall; and a partition wall partitioning 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 second fluid flowing through the second cell, the heat exchanger performing heat exchange between the second cell and the second fluid,
The heat exchanger further includes a first flow path in which the first cells in which both axial end portions are sealed are in communication with each other, and the first flow path includes an inflow side opening portion and an outflow opening in the peripheral wall. Have a side opening,
At least one of the inflow side opening and the outflow side opening is formed wider than the first cell.
The at least one of the inflow side opening and the outflow side opening formed wider than the first cell includes a widening portion gradually widening toward the outer surface side of the peripheral wall. Heat exchanger.
The ratio (W1 / W2) of the width (W1) of the maximum width portion to the width (W2) of the minimum width portion in the widening portion is 1.5 to 3.5,
A ratio (W1-W2) between the width (W1) of the maximum width portion and the width (W2) of the minimum width portion and a ratio (D) between the maximum width portion and the minimum width portion The heat exchanger according to claim 2, wherein (W1-W2) / D) is 0.5 to 2.1.
The heat exchanger further includes a flow passage portion for supplying and discharging the first fluid to the first cell,
The flow path portion is
An inflow space communicating with the inflow side opening, and a dividing portion dividing an outflow space communicating with the outflow side opening toward the outer peripheral side of the peripheral wall;
An introduction passage communicating with the inflow space to supply the first fluid to the inflow space;
The heat exchanger according to any one of claims 1 to 3, further comprising: an exhaust passage communicating with the outflow space and exhausting the first fluid from the outflow space.
The inflow space of the flow passage portion is provided straddling a plurality of the inflow side openings;
The heat exchanger according to claim 4, wherein the outflow space of the flow passage portion is provided across the plurality of the outflow side openings.