阅读说明：本技术 汽车用余热回收装置 (Automobile waste heat recovery device ) 是由 永井孝范 于 2019-05-17 设计创作，主要内容包括：一种汽车用余热回收装置(1),具备：基体(2),供第一流体流通；及扁平流通管(5m、5n),以相对于第一流体的流动方向形成角度的方式延伸设置,且扁平面设置成沿着所述第一流体的流动方向,供与第一流体进行热交换的第二流体流通,第一流体的流动方向的上游侧的扁平流通管组和下游侧的扁平流通管组分别在与第一流体的流动方向大致垂直的方向上隔开间隔地并排设置多个扁平流通管(5m、5n),下游侧的扁平流通管(5n)中的第一流体的流动方向的上游侧的端部(51n)设置成在流动方向上与上游侧的扁平流通管(5m)不重叠,并且以使上游侧的扁平流通管组与下游侧的扁平流通管组之间进行U形转弯的方式构成供第二流体流通的流路。能够显著提高热交换效率,并且能够将冷却水等进行热交换的流体向与导入侧相同的一侧导出,能够提高车辆内的设置部位的自由度。(An automobile waste heat recovery device (1) is provided with: a base body (2) in which a first fluid flows; and flat flow tubes (5m, 5n) extending at an angle to the flow direction of the first fluid, and the flat surface is arranged along the flow direction of the first fluid and is communicated with a second fluid which exchanges heat with the first fluid, the flat flow tube group at the upstream side and the flat flow tube group at the downstream side in the flow direction of the first fluid are respectively provided with a plurality of flat flow tubes (5m, 5n) in parallel at intervals in the direction which is approximately vertical to the flow direction of the first fluid, the end (51n) at the upstream side in the flow direction of the first fluid in the flat flow tube (5n) at the downstream side is arranged not to overlap with the flat flow tube (5m) at the upstream side in the flow direction, and a flow path through which the second fluid flows is configured so that the upstream flat flow tube group and the downstream flat flow tube group are U-turned. The heat exchange efficiency can be remarkably improved, and the fluid such as cooling water that exchanges heat can be led out to the same side as the introduction side, so that the degree of freedom of the installation position in the vehicle can be improved.)

1. An automobile exhaust heat recovery device is characterized by comprising:

a substrate in fluid communication with a first fluid; and

a flat flow tube extending at an angle to a flow direction of the first fluid and having a flat surface along the flow direction of the first fluid, the flat flow tube being in flow communication with a second fluid that exchanges heat with the first fluid,

the upstream flat flow tube group and the downstream flat flow tube group in the flow direction of the first fluid are each configured such that a plurality of the flat flow tubes are arranged in parallel at intervals in a direction substantially perpendicular to the flow direction of the first fluid,

an upstream-side end portion in a flow direction of the first fluid in the flat flow tubes of the downstream-side flat flow tube group is provided so as not to overlap with the flat flow tubes of the upstream-side flat flow tube group in the flow direction of the first fluid,

the flow path through which the second fluid flows is configured so that the upstream flat flow tube group and the downstream flat flow tube group are U-turned.

2. The waste heat recovery apparatus for an automobile according to claim 1,

the upstream flat flow tube group and the downstream flat flow tube group are inserted together into the same heat transfer fin,

a plurality of heat transfer fins are provided at intervals in a pipe direction in which the upstream flat flow tube group and the downstream flat flow tube group extend.

3. The waste heat recovery apparatus for an automobile according to claim 1 or 2,

the automobile waste heat recovery device is provided with:

a first partition portion in which one end of each of the flat flow-through tubes of the upstream-side flat flow-through tube group is open; and

a second partition portion having an opening at one end of each of the flat flow tubes of the downstream-side flat flow tube group and being partitioned from the first partition portion,

introducing the second fluid from the outside to one of the first partition portion and the second partition portion, and discharging the second fluid from the other of the first partition portion and the second partition portion to the outside,

and a U-turn partition portion is provided in which the other end opening of each of the flat flow tubes of the upstream flat flow tube group and the other end opening of each of the flat flow tubes of the downstream flat flow tube group are open.

4. The waste heat recovery device for the automobile according to any one of claims 1 to 3,

the matrix is formed by joining a pair of halves in alignment in the direction of the channels of the flat flow-through tubes,

both end portions of each of the flat flow tubes are fitted into and welded to the through-hole of one of the half bodies and the through-hole of the other half body, respectively.

5. The waste heat recovery device for the automobile according to any one of claims 1 to 4,

the matrix is formed by joining a pair of halves in alignment in the direction of the channels of the flat flow-through tubes,

the fitting portion provided in the alignment portion of one of the half bodies is fitted to the fitted portion provided in the alignment portion of the other half body.

6. The waste heat recovery device for the automobile according to any one of claims 1 to 5,

the automobile waste heat recovery device is provided with:

a base body having a fluid inlet portion, a fluid outlet portion, and a bulge portion between the fluid inlet portion and the fluid outlet portion, and formed by joining a pair of half bodies so as to align in a tube direction of the flat flow tube;

a partition plate extending in a flow direction of the first fluid flowing through the base and substantially dividing an inside of the expanded portion into a heat exchange path and a bypass path; and

a tilt valve capable of switching the flow of the first fluid flowing through the base member so as to be restricted to either the heat exchange path or the bypass path,

the upstream flat flow tube group and the downstream flat flow tube group are provided so that the first fluid flowing through the heat exchange path flows around the flat flow tube groups.

7. The waste heat recovery apparatus for an automobile according to claim 6,

the baffle, the tilt valve, and the flat flow tube are positioned between the halves.

Technical Field

The present invention relates to a waste heat recovery device that recovers and utilizes waste heat of exhaust gas or the like of an internal combustion engine of an automobile.

Background

Conventionally, there is known a device for heating cooling water by using waste heat of exhaust gas generated in an internal combustion engine of an automobile and recovering the waste heat. For example, patent document 1 discloses an automobile waste heat recovery device including an exhaust gas introduction portion into which exhaust gas generated in an internal combustion engine is introduced, a heat recovery path connected to an upper portion on a downstream side of the exhaust gas introduction portion, a bypass provided below the heat recovery path and connected to a lower portion on the downstream side of the exhaust gas introduction portion, a heat recovery unit disposed on an upper surface of the bypass and heating cooling water by the exhaust gas sent from the heat recovery path, and a valve provided rotatably upstream or downstream of the bypass and the heat recovery path and closing the bypass or the heat recovery path to restrict a flow of the exhaust gas. In the heat recovery unit of the waste heat recovery device, a plurality of flat tubular heating plates through which exhaust gas passes are provided in the core casing, and the cooling water flowing in the core casing is heated by heat of the exhaust gas flowing to the heating plates.

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 2012 and 31796

Disclosure of Invention

Technical problem to be solved by the invention

However, in addition to the demand for further improvement in heat exchange efficiency, the automobile exhaust heat recovery device is required to have a structure capable of discharging a fluid, such as cooling water, that exchanges heat to the same side as the introduction side in accordance with the state of the installation site in the vehicle.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an automotive exhaust heat recovery device capable of remarkably improving heat exchange efficiency, guiding out a fluid that exchanges heat, such as cooling water, to the same side as an introduction side, and improving the degree of freedom of an installation location in a vehicle.

The present invention provides an automobile exhaust heat recovery device, comprising: a substrate in fluid communication with a first fluid; and flat flow tubes each extending at an angle to a flow direction of the first fluid and having a flat surface provided along the flow direction of the first fluid, the flat flow tubes being configured to flow a second fluid that exchanges heat with the first fluid, the flat flow tube group on an upstream side and the flat flow tube group on a downstream side in the flow direction of the first fluid being respectively configured to have a plurality of the flat flow tubes arranged side by side at intervals in a direction substantially perpendicular to the flow direction of the first fluid, an end portion on the upstream side in the flow direction of the first fluid in the flat flow tubes of the flat flow tube group on the downstream side being configured not to overlap with the flat flow tubes of the flat flow tube group on the upstream side in the flow direction of the first fluid, and the flat flow tubes being configured to make a U-turn between the flat flow tube group on the upstream side and the flat flow tube group on the downstream side A flow path through which the fluid flows.

In this way, the flat surfaces of the flat flow tubes are arranged in parallel at intervals along the flow direction of the first fluid, whereby the heat exchange area can be increased. In addition, since the upstream end of the downstream flat flow tube in the flow direction of the first fluid does not overlap the upstream flat flow tube, the first fluid having a large temperature difference with the second fluid can be brought into contact with the downstream flat flow tube, thereby improving the heat exchange performance. Therefore, the heat exchange efficiency can be remarkably improved. In addition, with the structure in which the second fluid flows between the upstream flat tube group and the downstream flat tube group while making a U-turn, the fluid that exchanges heat, such as cooling water, can be led out to the same side as the inlet side, and the degree of freedom in the location where the automotive waste heat recovery device is installed in the vehicle can be increased. Further, the flat flow pipe has a flat shape and a flat arrangement, so that the pressure loss of the first fluid flowing through the base body can be reduced, and a smooth flow of the first fluid can be ensured.

In the heat recovery device for an automobile according to the present invention, the upstream flat flow tube group and the downstream flat flow tube group are inserted together into the same heat transfer fin, and a plurality of heat transfer fins are provided at intervals in a pipe direction in which the upstream flat flow tube group and the downstream flat flow tube group extend.

In this way, the heat exchange efficiency can be further improved by providing the plurality of heat transfer fins at intervals in the pipe passage direction in which the upstream flat flow tube group and the downstream flat flow tube group extend. Further, the upstream flat flow tube group and the downstream flat flow tube group are inserted into the same heat transfer fin, and the upstream flat flow tube group and the downstream flat flow tube group can be easily assembled integrally by attaching the heat transfer fin.

The present invention provides an automobile exhaust heat recovery device, comprising: a first partition portion in which one end of each of the flat flow-through tubes of the upstream-side flat flow-through tube group is open; and a second partition portion in which one end opening of each of the flat flow tubes of the downstream-side flat flow tube group is open and which is partitioned from the first partition portion, wherein the second fluid is introduced from the outside into one of the first partition portion and the second partition portion, and the second fluid is discharged from the other of the first partition portion and the second partition portion to the outside, and a U-turn partition portion in which the other end opening of each of the flat flow tubes of the upstream-side flat flow tube group and the other end opening of each of the flat flow tubes of the downstream-side flat flow tube group are open is provided.

This makes it possible to easily introduce and discharge the second fluid into and from the upstream flat flow tube group and the downstream flat flow tube group. Further, the U-turn partition eliminates the need for a complicated structure such as shifting the positions of the flat flow tubes on the upstream side in the stacking direction of the flat flow tubes and connecting the flat flow tubes on the downstream side, and can simplify the structure for U-turning the second fluid and reduce the cost. In addition, since the second fluid led out from each flat flow tube of the upstream or downstream flat flow tube group is mixed in the U-turn partition portion, turbulence and agitation can be promoted to suppress temperature unevenness, and the heat exchange efficiency can be further improved.

In the automobile exhaust heat recovery device according to the present invention, the base is formed by joining a pair of half bodies so as to align in the tube direction of the flat flow tube, and both end portions of each of the flat flow tubes are fitted into and welded to the through holes of one of the half bodies and the through holes of the other half body.

Accordingly, the flat flow tube can be easily and reliably positioned with respect to the pair of half bodies and the base body joined so as to be aligned in the tube passage direction of the flat flow tube, and the flat flow tube can be fixed in an erected state.

In the automobile exhaust heat recovery device according to the present invention, the base is formed by joining a pair of half bodies so as to align in the pipe passage direction of the flat flow tube, and the fitting portion provided in the alignment portion of one of the half bodies is fitted to the fitted portion provided in the alignment portion of the other half body.

Accordingly, the first half body and the second half body joined to each other so as to be aligned in the tube passage direction of the flat flow tube can be positioned and aligned at accurate positions, and the manufacturing operation can be facilitated and the yield can be improved.

The present invention provides an automobile exhaust heat recovery device, comprising: a base body having a fluid inlet portion, a fluid outlet portion, and a bulge portion between the fluid inlet portion and the fluid outlet portion, and formed by joining a pair of half bodies so as to align in a tube direction of the flat flow tube; a partition plate extending in a flow direction of the first fluid flowing through the base and substantially dividing an inside of the expanded portion into a heat exchange path and a bypass path; and a tilt valve that can be switched so as to restrict the flow of the first fluid flowing through the base body to either the heat exchange path or the bypass path, wherein the upstream flat tube group and the downstream flat tube group are provided so that the first fluid flowing through the heat exchange path flows around the upstream flat tube group and the downstream flat tube group.

Accordingly, the heat exchange path and the bypass path can be formed by the base body formed by joining the pair of half bodies and the partition plate that substantially divides the inside of the expanded portion of the base body, and therefore the automotive exhaust heat recovery device having the switchable heat exchange path and bypass path can be formed with a small number of parts. Therefore, the number of joining portions of the parts is reduced, the manufacturing efficiency can be improved, and the manufacturing cost can be reduced by reducing the cost of the parts and the cost of the joining operation. Further, since the number of parts is small, the automobile exhaust heat recovery device can be reduced in weight, and fuel economy of an automobile can be improved by reducing the weight.

In the heat recovery device for an automobile of the present invention, the partition plate, the tilt valve, and the flat flow tube are provided between the half bodies.

Accordingly, the partition plate, the tilt valve, and the flat flow tube can be easily provided on the base body in association with the operation of aligning the pair of half bodies with each other in the tube passage direction of the flat flow tube.

Effects of the invention

According to the automobile exhaust heat recovery device of the present invention, the heat exchange efficiency can be significantly improved, and the degree of freedom of the installation location in the vehicle can be improved by discharging the fluid that exchanges heat, such as cooling water, to the same side as the introduction side.

Drawings

Fig. 1 is a perspective view of an automotive heat recovery device according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view of the vehicle heat recovery device according to the embodiment.

Fig. 3 is a perspective view of the automobile exhaust heat recovery device according to the embodiment in a state in which a flat flow tube, a partition plate, and a tilt valve are disposed in one half body.

Fig. 4 is a front view of the other half body and the partition unit in the automobile residual heat recovery device according to the embodiment as viewed from the inside.

Fig. 5 is a front view of the other half body in a state of being removed from the state of fig. 4.

Fig. 6 (a) is a partial cross-sectional view of the flat flow tubes, the heat transfer fins, the partition units, and the U-turn partitions in the automobile residual heat recovery device according to the embodiment, and (b) is a front view of an assembly of the flat flow tubes and the heat transfer fins in the automobile residual heat recovery device according to the embodiment.

Fig. 7 is a partial vertical sectional view illustrating a heat exchange operation of the heat recovery device for an automobile according to the embodiment.

Detailed Description

[ waste heat recovery device for automobile of embodiment ]

As shown in fig. 1 to 7, the vehicle waste heat recovery device 1 according to the embodiment of the present invention includes a base body 2, and the base body 2 includes a substantially cylindrical fluid introduction portion 21, a substantially cylindrical fluid discharge portion 22, and a bulging portion 23 provided between the fluid introduction portion 21 and the fluid discharge portion 22, and through which a first fluid flows. The bulging portion 23 bulges outward to form a wide space inside, and the base body 2 as a whole is formed in a substantially tubular shape having a bulge in the middle portion. The base body 2 in the illustrated example is formed such that the axis of the substantially cylindrical fluid introduction portion 21 and the axis of the substantially cylindrical fluid discharge portion 22 substantially coincide with each other, and the bulging portion 23 is formed so as to project laterally in one direction from the fluid introduction portion 21 and the fluid discharge portion 22.

The base body 2 is formed by joining a pair of half bodies 24a, 24 b. The half bodies 24a and 24b have a shape obtained by dividing the base 2 into two parts in the axial direction of the fluid inlet portion 21 and the fluid outlet portion 22 and in the protruding direction of the bulging portion 23, and the half body 24a and the half body 24b have substantially the same shape and substantially the same size. The pair of half bodies 24a and 24b of the present embodiment are joined so as to be aligned in the tube direction of the flat flow tubes 5m and 5n described later.

The aligned portions of the half bodies 24a and 24b abut against each other at the end portion on the upstream side of the fluid introduction portion 21 and the end portion on the downstream side of the fluid discharge portion 22, and a fitting portion 241a and a fitted portion 241b are formed in the middle portion so as to have different heights from each other and bulge outward, and the fitting portion 241a is fitted into the fitted portion 241 b. The abutting end surfaces and the overlapping surfaces of the fitting portion 241a and the fitted portion 241b or the end portions of the fitted portion 241b are welded by laser welding or the like to join the half body 24a and the half body 24b to be integrated as the base body 2.

A mounting portion 251 is formed in the wall portion 25 of the base body 2 corresponding to the bulging portion 23 so as to be recessed inward at a predetermined position, and the partition plate 3 described later is positioned and mounted at the mounting portion 251. The placing portions 251 are formed in the half body 24a and the half body 24b, respectively, and are provided on both sides of the base 2. The shaft portion 42 of the tilt valve 4 described later is supported so as to be tiltable so as to span the shaft portion 42 of the tilt valve 4 described later on the wall portions 25 and 25 on both sides of the base 2 corresponding to the bulging portions 23, in other words, the wall portion 25 of the one half body 24a and the wall portion 25 of the other half body 24 b.

Further, through holes 26m and 26m on the upstream side and through holes 26n and 26n on the downstream side in the flow direction of the first fluid are provided in the wall portions 25 and 25 on both sides of the base 2 corresponding to the bulging portion 23, in other words, the wall portion 25 of the one half body 24a and the wall portion 25 of the other half body 24b, respectively. The through holes 26m and 26n are elongated holes extending in the tube direction of the substantially tubular base body 2, and are formed at positions offset in the protruding direction of the bulging portion 23.

The upstream through-hole 26m of the first half body 24a and the upstream through-hole 26m of the second half body 24b are arranged in parallel at intervals in a direction substantially perpendicular to the flow direction of the first fluid, in other words, at intervals in the direction in which the expanded portion 23 expands, and a plurality of pairs of through-holes 26m and 26m are provided at corresponding positions of the wall portions 25 and 25. The through-holes 26n on the downstream side of the first half body 24a and the through-holes 26n on the downstream side of the second half body 24b are also provided in a plurality of rows at intervals in a direction substantially perpendicular to the flow direction of the first fluid, in other words, at intervals in the direction in which the expanded portion 23 expands, and a plurality of pairs of the through-holes 26n, 26n are provided at corresponding positions of the wall portions 25, 25.

In the through hole 26n on the downstream side, the end 261n on the upstream side in the flow direction of the first fluid is provided so as not to overlap the through hole 26m on the upstream side with respect to the flow direction of the first fluid. The flat flow tubes 5m and 5n described later are inserted so as to extend through the upstream through holes 26m and the downstream through holes 26n and 26n, and both ends of the flat flow tubes 5m and 5n are fitted into the upstream through holes 26m and the downstream through holes 26n and 26n, respectively, and welded to the peripheries of the through holes 26m and 26 n.

Inside the expanded portion 23, a partition plate 3 that substantially divides the inside of the expanded portion 23 into a heat exchange path ER and a bypass path DR extends in the flow direction of the first fluid flowing through the base body 2. The partition 3 in the illustrated example is a substantially rectangular tray shape, and is disposed so that the recessed side of the tray is the fluid inlet portion 21 and the fluid outlet portion 22, and is positioned so that the recessed portions 311 and 311 of the side walls 31 and 31 on both sides thereof are engaged with the seating portions 251 and 251. The positioned partition plate 3 is provided at a position further toward the projecting side of the bulging portion 23 than the pipe passage of the fluid introducing portion 21 and the fluid discharging portion 22.

The separator 3 is fixed to the base 2 by joining the side walls 31 and 31 to the walls 25 and 25 of the base 2 by laser welding or the like, and the separator 3 is provided so as to span between the half bodies 24a and 24 b. The structure may be such that a desired slit is formed in the wall portions 25 and 25 of the half bodies 24a and 24b, and the side walls 31 and 31 of the separator 3 are pushed to the slit and fixed by plug welding or fillet welding.

A tilt valve 4 capable of switching the flow of the first fluid flowing through the base body 2 so as to be restricted to either the heat exchange path ER or the bypass path DR is provided on the upstream side of the separator 3 in the flow direction of the first fluid. The tilt valve 4 is composed of a substantially tongue-shaped valve plate 41 and a shaft 42 fixed to a base of the valve plate 41, and is supported so as to be tiltable by being bridged between the half bodies 24a and 24 b. A drive plate 43 and a drive rod 441 attached to a thermal actuator 44 that engages with a projection 431 projecting outward from the drive plate 43 are provided in a portion of the shaft portion 42 of the tilt valve 4 projecting outward from the other half body 24b, and the tilt valve 4 is tilted via the drive plate 43 by the reciprocating operation of the drive rod 441 and is opened and closed. The thermal actuator 44 illustrated in the drawing corresponds to a configuration in which the fluid to be heated corresponding to the second fluid is led out from the pipe 74 described later after heat exchange, and is disposed adjacent to the pipe 74 so as to be able to detect the temperature of the fluid to be heated flowing out from the flat flow tube 5 n. The tilt valve 4 may be provided downstream of the diaphragm 3.

An upstream flat flow tube 5m and a downstream flat flow tube 5n, each having a flat tube shape and through which a second fluid that exchanges heat with the first fluid flows, are arranged between the half bodies 24a and 24b at positions offset from the separators 3 in the protruding direction of the bulging portions 23. The flat flow tubes 5m and 5n extend at an angle with respect to the direction of the channel of the substantially tubular substrate 2, i.e., the direction of flow of the first fluid, and in the present embodiment extend at substantially right angles to the direction of flow of the first fluid. The flat surfaces of the flat flow tubes 5m and 5m are provided along the flow direction of the first fluid.

The flat flow tubes 5m on the upstream side in the flow direction of the first fluid are arranged in parallel at intervals in a direction substantially perpendicular to the flow direction of the first fluid, in other words, in the direction in which the bulging portion 23 bulges, and the flat flow tube group on the upstream side is constituted by the flat flow tubes 5m arranged in parallel. The downstream flat flow tubes 5n in the flow direction of the first fluid are also arranged in parallel at intervals in a direction substantially perpendicular to the flow direction of the first fluid, in other words, in parallel at intervals in the direction in which the bulging portion 23 bulges, and the downstream flat flow tube group is constituted by the plurality of parallel flat flow tubes 5 n.

The upstream end 51n of the flat flow tubes 5n of the downstream flat flow tube group in the flow direction of the first fluid is disposed so as not to overlap the flat flow tubes 5m of the upstream flat flow tube group in the flow direction of the first fluid. The upstream flat flow tube group and the downstream flat flow tube group, or the upstream flat flow tube group and the downstream flat flow tube group, respectively, are provided so that the first fluid flowing through the heat exchange path ER flows around the flat flow tubes 5m and the downstream flat flow tube 5 n.

The flat flow tubes 5m and 5n in the illustrated example are formed by arranging one plate 52 and the other plate 53 having a substantially コ -shaped cross section in a thickness direction so as to face each other with a space therebetween, further, the structure in which the support portions 54 supporting the thicknesses of the flat flow tubes 5m and 5n are formed in a convex shape along the tube path direction, protrude inward, and a plurality of the support portions are provided at intervals in the width direction of the flat flow tubes 5m and 5n, and the effects of promoting turbulence and heat exchange efficiency of the flow of the second fluid flowing inside the flat flow tubes 5m and 5n, improving the fixing strength between the flat flow tubes 5m and 5n and the heat transfer fins 6 described later, and improving impact resistance and durability are obtained, but the structure of the upstream flat flow tube and the downstream flat flow tube in the present invention is not limited to the gist of the present invention.

A plurality of heat transfer fins 6 are inserted and disposed at predetermined intervals in the tube passage direction of the flat flow tubes 5m, 5n, and the heat transfer area of heat exchange is increased by the heat transfer fins 6. A tapered edge 62 is formed in each insertion hole 61 of the heat transfer fin 6, and the flat flow path tubes 5m and 5n are inserted into the insertion holes 61 of the heat transfer fin 6 and are press-fitted and held by the tapered edges 62 of the heat transfer fin 6. In other words, the heat transfer fins 6 are fixed to the upstream flat flow tubes 5m and the downstream flat flow tubes 5n by press-fitting and holding the tapered edge 62. The upstream flat flow tube group constituted by the flat flow tubes 5m and the downstream flat flow tube group constituted by the flat flow tubes 5n are inserted together through the same heat transfer fins 6, and a plurality of heat transfer fins 6 are provided in parallel at intervals in the pipe direction in which the upstream flat flow tube group and the downstream flat flow tube group extend.

A substantially tray-shaped partition unit 7 for introducing and discharging the second fluid flowing through the flat flow tubes 5m and 5n is provided outside the upstream through hole 26m and the downstream through hole 26n in the other half body 24 b. The partition unit 7 includes a first partition portion 71 in which one end of each flat flow tube 5m of the upstream flat flow tube group is open, and a second partition portion 72 in which one end of each flat flow tube 5n of the downstream flat flow tube group is open and which is partitioned from the first partition portion 71, and the flat flow tubes 5m and 5n are provided so as to communicate with each other in the space of the first partition portion 71 and the space of the second partition portion 72.

The pipe 73 is connected to the connection hole 711 of the first partition portion 71, and the pipe 74 is connected to the connection hole 721 of the second partition portion 72. One of the pipes 73 and 74 is an introduction pipe for introducing the second fluid subjected to heat exchange from the outside, and the other is a discharge pipe for discharging the second fluid subjected to heat exchange to the outside, and the second fluid is introduced from the outside into one of the first partition portion 71 and the second partition portion 72, and is discharged from the other of the first partition portion 71 and the second partition portion 72. The partition unit 7 is disposed along the other half 24b of the base 2 and fixed to the base 2 or the other half 24b by welding or the like.

A substantially tray-shaped U-turn partition portion 8 that forms a flow path through which the second fluid flows so as to make a U-turn between the upstream flat flow tube group and the downstream flat flow tube group is provided outside the upstream through hole 26m and the downstream through hole 26n in the one half body 24 a. In the U-turn partition portion 8, the other end of each flat flow tube 5m of the upstream side flat flow tube group is open, and the other end of each flat flow tube 5n of the downstream side flat flow tube group is open, and the flat flow tubes 5m, 5n are respectively provided in communication in the space of the U-turn partition portion 8. The U-turn section 8 is disposed along one half 24a of the base 2 and fixed to the base 2 or the one half 24a by welding or the like.

In the automobile heat recovery device 1 of the present embodiment, for example, the base body 2 is connected to an exhaust pipe of an internal combustion engine of an automobile, and exhaust gas as a heating fluid of a first fluid is circulated through the base body 2. Then, a fluid to be heated, such as cooling water, oil, or air, which is a second fluid, is caused to flow through the flat flow tubes 5m and 5 n. When the tilt valve 4 is in the open state, the exhaust gas flows through a bypass DR of the base body 2 as indicated by the two-dot chain line arrow in fig. 7. In the figure, reference numeral 27 denotes a receiving portion provided in the base body 2 to receive the valve plate 41 of the tilt valve 4 in an open state.

When the tilt valve 4 is closed by the thermal actuator 44 due to, for example, the temperature of the fluid to be heated of the second fluid falling below the predetermined temperature, the exhaust gas is restricted from flowing to the side opposite to the arrangement side of the flat flow tubes 5m, 5n of the separator 3 as indicated by the thick line arrows in fig. 7, flows through the heat exchange path ER of the base 2, is guided to the arrangement side of the flat flow tubes 5m, 5n of the separator 3 and the heat transfer fins 6, and heats the fluid to be heated such as the cooling water flowing through the U-turn between the flat flow tubes 5m, 5n to exchange heat.

At this time, the upstream end 51n of the flat flow tubes 5n of the downstream flat flow tube group in the flow direction of the exhaust gas is arranged so as not to overlap the flat flow tubes 5m of the upstream flat flow tube group in the flow direction of the exhaust gas, and therefore, efficient heat exchange is performed in both the upstream flat flow tubes 5m and the downstream flat flow tubes 5 n. When the thermal actuator 44 detects that the temperature of the heated fluid heated and led out becomes equal to or higher than a predetermined temperature, the thermal actuator 44 opens the tilt valve 4 to allow the exhaust gas to flow through the bypass DR, thereby stopping the heat exchange with the heated fluid.

According to the automotive waste heat recovery device 1 of the present embodiment, the flat surfaces of the flat flow tubes 5m and 5n are arranged in parallel at intervals along the flow direction of the first fluid, so that the heat exchange area can be increased. In addition, by not overlapping the upstream-side end 51n of the downstream-side flat flow tube 5n in the flow direction of the first fluid with the upstream-side flat flow tube 5m, the first fluid having a large temperature difference with the second fluid can be made to contact the downstream-side flat flow tube 5n, and the heat exchange performance can be improved. Therefore, the heat exchange efficiency can be remarkably improved. Further, with the structure in which the second fluid flows between the upstream flat tube group and the downstream flat tube group while making a U-turn, the fluid that exchanges heat, such as cooling water, can be led out to the same side as the inlet side, and the degree of freedom in the location where the automobile heat recovery device 1 is installed in the vehicle can be increased. Further, the flat flow pipes 5m and 5n have a flat shape and are arranged so that the pressure loss of the first fluid flowing through the base body 2 can be reduced to ensure a smooth flow of the first fluid, and particularly when the first fluid is exhaust gas of an internal combustion engine of an automobile, the reduction in pressure loss can reduce the back pressure of the internal combustion engine to improve the exhaust efficiency, intake efficiency, and combustion efficiency of the internal combustion engine.

Further, the heat exchange efficiency can be further improved by providing the plurality of heat transfer fins 6 at intervals in the pipe direction in which the upstream flat flow tube group and the downstream flat flow tube group extend. Further, by inserting the upstream flat flow tube group and the downstream flat flow tube group into the same heat transfer fin 6, the upstream flat flow tube group and the downstream flat flow tube group can be easily assembled integrally by attaching the heat transfer fin 6.

Further, the first and second partitions 71 and 72 can easily introduce and discharge the second fluid into and from the upstream and downstream flat flow tube groups. Further, the U-turn partition 8 eliminates the need for a complicated structure such as shifting the positions of the flat flow tubes 5m on the upstream side in the stacking direction of the flat flow tubes 5m to connect the flat flow tubes 5n on the downstream side, and can simplify the structure for U-turning the second fluid, thereby reducing the cost. Further, the second fluid led out from each flat flow tube 5m or 5n of the upstream or downstream flat flow tube group is mixed in the U-turn partition 8, and therefore turbulent flow and agitation are promoted, temperature unevenness is suppressed, and heat exchange efficiency is further improved.

Further, the flat flow tubes 5m, 5n can be easily and reliably positioned with respect to the pair of half bodies 24a, 24b and the base body 2, and the flat flow tubes 5m, 5n can be fixed in an erected state, by forming the base body 2 by joining the pair of half bodies 24a, 24b so as to align in the tube path direction of the flat flow tubes 5m, 5n, and fitting and welding both end portions of each of the flat flow tubes 5m, 5n to the through holes 26m, 26n of the one half body 24a and the through holes 26m, 26n of the other half body 24b, respectively.

In the structure in which the base body 2 is formed by joining the pair of half bodies 24a, 24b so as to align in the tube passage direction of the flat flow tubes 5m, 5n, the fitting portion 241a provided in the alignment portion of the one half body 24a is fitted to the fitted portion 241b provided in the alignment portion of the other half body 24b, whereby the one half body 24a and the other half body 24b can be aligned while being positioned at accurate positions, and the manufacturing operation can be facilitated and the yield can be improved.

The heat recovery apparatus for an automobile 1 having the switchable heat exchange path ER and bypass DR can be formed with a small number of parts by providing the bulging portion 23 and the partition plate 3 in the base body 2 to divide the heat exchange path ER and the bypass DR and switching the flow of the first fluid between the heat exchange path ER and the bypass DR by switching the tilt valve 4. Therefore, the number of joining portions of the parts is reduced, the manufacturing efficiency can be improved, and the manufacturing cost can be reduced by reducing the cost of the parts and the cost of the joining operation. Further, since the number of parts is small, the vehicle waste heat recovery device 1 can be reduced in weight, and fuel economy of the vehicle can be improved by reducing the weight.

Further, by the structure in which the partition plate 3, the tilt valve 4, and the flat flow tubes 5m and 5n are bridged between the pair of half bodies 24a and 24b, the partition plate 3, the tilt valve 4, and the flat flow tubes 5m and 5n can be easily installed in the base body 2 in association with the work of aligning the pair of half bodies 24a and 24b with each other in the pipe direction of the flat flow tubes 5m and 5 n.

[ the invention disclosed in this specification includes the scope ]

The invention disclosed in the present specification includes, in addition to the inventions and embodiments described as examples of the invention, inventions in which some of the contents are changed to other contents disclosed in the present specification within a range where the invention can be applied, inventions in which other contents disclosed in the present specification are added to the contents, or inventions in which some of the contents are deleted and conceptually defined in a general manner within a limit where some effects are obtained. The invention disclosed in the present specification also includes the following modifications and additional writing.

For example, the base body in the automobile exhaust heat recovery device of the present invention is optional, and is not limited to the structure in which the pair of half bodies 24a and 24b are joined so as to align in the pipe direction of the flat flow pipes 5m and 5n in the above-described embodiment, and the automobile exhaust heat recovery device of the present invention also includes an invention having a base body which has only a heat exchange path and does not have a structure capable of switching between the heat exchange path ER and the bypass path DR.

In addition, although the automobile waste heat recovery device 1 of the above embodiment is configured to be provided with the U-turn section 8 that can simplify the structure for U-turning the second fluid, any appropriate structure that can configure the flow path through which the second fluid flows so as to make a U-turn between the upstream flat flow tube group and the downstream flat flow tube group is included in the automobile waste heat recovery device of the present invention. The automobile exhaust heat recovery device of the present invention includes any structure as long as the upstream end of the flat flow tubes of the downstream flat flow tube group in the flow direction of the first fluid is not overlapped with the flat flow tubes of the upstream flat flow tube group in the flow direction of the first fluid, and includes, for example, a structure in which the thickness of the downstream flat flow tubes is larger than the interval between the upstream flat flow tubes, or a structure in which the thickness of the downstream flat flow tubes is smaller than the interval between the upstream flat flow tubes.

In the vehicle waste heat recovery device according to the present invention, when the structure in which the second fluid is U-turned and the second fluid is led out to the same side as the introduction side is configured to lead out the second fluid by one U-turn, the structure of the vehicle waste heat recovery device can be simplified and the device can be installed in a more space-saving manner.

In the vehicle waste heat recovery device according to the present invention, the first fluid and the second fluid may be either one of a heating fluid and the other one of the heating fluid and the heated fluid, respectively, and are included in the present invention. The type of the heating fluid or the heated fluid is arbitrary, and for example, the heating fluid may be a liquid other than the exhaust gas, steam, or the like.

Industrial applicability

The present invention can be used, for example, in the case of recovering waste heat from exhaust gas of an internal combustion engine of an automobile.

Description of the reference numerals

1 … automobile residual heat recovery device 2 … base 21 … fluid introduction portion 22 … fluid introduction portion 23 … bulging portion 24a, 24b … half body 241a … fitting portion 241b … by fitting portion 25 … wall portion 251 … seating portion 26m, 26n … through hole 261n … upstream end 27 … receiving portion 3 … spacer 31 … side wall 311 … recess 4 … valve plate 42 … shaft portion 43 … drive plate 431 … protrusion 44 … heat actuator … drives rod 5m, the end 52 of the 5n … flat flow tube 51n … on the upstream side, the 53 … plate 54 …, the support 6 … heat transfer fin 61 …, the insertion hole 62 … tapered edge 7 … partition unit 71 … first partition 711 …, the connection hole 72 … second partition 721 …, the 74 … piping 8 … U-turn partition ER … heat exchange path DR … detour.