WO2016098494A1

WO2016098494A1 - Heat exchanger

Info

Publication number: WO2016098494A1
Application number: PCT/JP2015/081766
Authority: WO
Inventors: 裕久大上; 裕美石川
Original assignee: フタバ産業株式会社
Priority date: 2014-12-15
Filing date: 2015-11-11
Publication date: 2016-06-23
Also published as: JP2016114301A; JP6475006B2

Abstract

This heat exchanger has a flow path through which a first fluid flows and a plurality of adjacently-disposed plates. The plurality of plates are each provided with a body section having a general flow path and a communication section having a communication flow path serving as a flow path extending from that plate to another plate. The communication section is formed such that the representative length of the communication flow path in the communication section is larger than the representative length of a section that connects to the communication flow path in the general flow path of the body section.

Description

Heat exchanger

Cross-reference of related applications

This international application claims priority based on Japanese Patent Application No. 2014-253378 filed with the Japan Patent Office on December 15, 2014, and is based on Japanese Patent Application No. 2014-253378. The entire contents are incorporated herein by reference.

This disclosure relates to a heat exchanger.

A heat exchanger for exchanging heat between a first fluid and a second fluid, which is a plate stack type heat exchanger in which a plurality of plates having a flow path through which the first fluid flows is stacked. (See Patent Document 1). The plate in the heat exchanger described in Patent Document 1 is formed in a cylindrical shape and includes a general flow path and a communication portion. The communication part is a flow path of the first fluid from one plate to the other plate, and is an opening formed in the plate. The general flow path is a flow path of the first fluid in the plate and is a part of the plate connected to the communication portion.

In the heat exchanger described in Patent Document 1, the representative length of the flow path in the communication portion is shorter than the representative length of the general flow path.

International Publication WO2012 / 095947

In the heat exchanger described in Patent Document 1, there is a possibility that the first fluid flowing in the general flow path collides with the flow path in the communication portion, and the flow of the first fluid near the communication portion stagnates. was there. In the heat exchanger, when stagnation occurs, the temperature of the first fluid increases, and the first fluid may locally boil.

Therefore, in one aspect of the present disclosure, it is desirable to reduce the occurrence of stagnation of the first fluid in the vicinity of the communication portion in the heat exchanger.

One aspect of the present disclosure relates to a heat exchanger that performs heat exchange between a first fluid and a second fluid.
The heat exchanger has a flow path through which the first fluid flows, and includes a plurality of plates arranged adjacent to each other.

Each plate has a main body and a communication part. The main body has a general flow path that is a flow path through which the first fluid flows inside the plate. The communication portion has a communication channel that is a flow path from the plate to another plate.

Furthermore, in one aspect of the present disclosure, the representative length in the communication flow path of the communication part of each plate is formed to be longer than the representative length of the connection part to the communication flow path in the general flow path of the main body part. ing.

According to such a heat exchanger, the flow of the first fluid from the general flow path to the communication flow path can be made smooth, and the occurrence of stagnation at the connection portion of the communication section can be reduced. For this reason, according to the heat exchanger in one side of this indication, it can reduce that the temperature of the 1st fluid rises and can reduce that the 1st fluid boils locally.

Further, in one aspect of the present disclosure, the representative length of the communication portion may be a distance from one end portion to the other end portion of the communication portion. Further, the representative length of the connection portion to the communication flow path in the general flow path of the main body portion is changed from one end of the connection portion to the other in the direction from one end of the communication portion to the other end. It is good also as the distance to an edge part.

In such a case, the communication part according to one aspect of the present disclosure is such that at least one of the one end part and the other end part of the communication part is at least one of the one end part and the other end part of the connection part. You may form so that it may be located outside rather than one side.

That is, in the heat exchanger according to one aspect of the present disclosure, the communication flow path in the communication portion is formed wider than the connection portion, and the end portion of the communication flow channel is positioned outside the end portion of the connection portion. Good.

According to such a heat exchanger, the flow of the first fluid from the general flow path to the communication flow path can be made smoother, and it is more likely that stagnation occurs at the connection portion of the communication section. It can be reliably reduced.

It is a perspective view showing a schematic appearance of an exhaust heat recovery device in an embodiment. FIG. 2 is a cross-sectional view of the exhaust heat recovery device in a closed state, and is a cross-sectional view taken along the line II-II in FIG. It is a perspective view which shows schematic structure of the heat exchanger in embodiment.

DESCRIPTION OF SYMBOLS 1 ... Exhaust heat recovery apparatus 2 ... Exhaust part 4 ... Shell member 6 ... Heat exchange part 8 ... Inflow part 10 ... Valve 12 ... Exhaust pipe 14 ... Exhaust pipe 16 ... Upstream end 18 ... Exhaust downstream end 20 ... Outer shell member 22 ... Lid member 24 ... Holding member 28 ... Heat exchange chamber 30 ... Heat exchanger 32 ... Plate 34 ... Inflow pipe 36 ... Outflow pipe 38 ... Main body part 40 ... First communication part 41 ... Second communication part 42 ... First plate plate 46 ... 1st communication part 48 ... 2nd communication part 54 ... 1st communication hole 56 ... 2nd communication hole 62 ... 2nd plate board 66 ... 3rd communication part 68 ... 4th communication part 74 ... 3rd communication hole 76 ... 1st Four communication holes 80 ... Gap 82 ... Gap 84 ... Gap 88 ... Introducing member 94 ... Valve element 96 ... Valve seat 100 ... Mesh member 140 ... Internal combustion engine 142 ... Exhaust (second fluid) 144 ... Coolant (first fluid) )

Hereinafter, an exemplary embodiment of the present disclosure will be described with reference to the drawings.
<Exhaust heat recovery device>
1 is mounted on a moving body having an internal combustion engine 140. The exhaust heat recovery apparatus 1 shown in FIG. The exhaust heat recovery apparatus 1 recovers heat from the exhaust 142 by exchanging heat with the exhaust 142 from the internal combustion engine 140 as a high-temperature fluid and the coolant 144 of the internal combustion engine 140 as a low-temperature fluid. The cooling liquid 144 in this embodiment may be cooling water or an oil liquid.

The exhaust 142 in the present embodiment is an example of the second fluid in the present disclosure, and the coolant 144 in the present embodiment is an example of the first fluid in the present disclosure.
The exhaust heat recovery apparatus 1 of this embodiment includes an exhaust part 2, a shell member 4, a heat exchange part 6 (see FIG. 2), an inflow part 8 (see FIG. 2), and a valve 10.

The exhaust unit 2 forms a path for guiding the exhaust 142 from the internal combustion engine 140 to the downstream side. The shell member 4 is a member that covers the outside of the exhaust part 2. The heat exchanging unit 6 includes a heat exchanger 30 (see FIG. 2) disposed between the exhaust unit 2 and the shell member 4, and between the exhaust 142 as a high temperature fluid and the coolant 144 as a low temperature fluid. To exchange heat.

The inflow part 8 is a part into which the exhaust 142 flows from the exhaust part 2 to the heat exchange part 6. The valve 10 is a valve that opens and closes the flow path of the exhaust 142, and is disposed downstream of the inflow portion 8 along the flow path of the exhaust 142 in the exhaust portion 2.

As shown in FIG. 2, the exhaust unit 2 includes an exhaust pipe 12. The exhaust pipe 12 is a cylindrical member having both ends opened. The upstream end portion of the exhaust pipe 12 is connected to an exhaust pipe, an exhaust manifold, or the like into which the exhaust 142 from the internal combustion engine 140 flows.

The shell member 4 includes an exhaust pipe 14, an outer shell member 20, a lid member 22, and a holding member 24.
The exhaust pipe 14 is a cylindrical member as a whole, and an upstream end 16 as one end portion has an opening having an inner diameter larger than the outer diameter of the exhaust pipe 12. In the internal space at the upstream end 16 of the exhaust pipe 14, the exhaust downstream end 18 of the exhaust pipe 12 is disposed in a non-contact state with the shell member 4. The exhaust downstream end 18 is an end opposite to the upstream end of the exhaust pipe 12.

The outer shell member 20 is a cylindrical member having an inner diameter larger than the diameter of the exhaust pipe 12. The downstream end of the outer shell member 20 is connected to the upstream end 16 of the exhaust pipe 14.
The lid member 22 closes the upstream opening of the outer shell member 20 along the flow path of the exhaust 142 in the exhaust pipe 12.

That is, the outer shell member 20, the lid member 22, and the exhaust pipe 12 form a heat exchange chamber 28 that is an annular space. The heat exchange chamber 28 is a space surrounded by the outer shell member 20, the lid member 22, and the exhaust pipe 12.
<Structure of heat exchanger>
The heat exchanger 30 disposed in the heat exchange chamber 28 includes a plurality of plates 32-1 to 32-N, an inflow pipe 34, and an outflow pipe 36. That is, the heat exchanger 30 is a so-called plate stack type heat exchanger. In addition, the code | symbol N here is an identifier showing the arrangement position of the plate 32, and is a positive integer 2 or more.

The inflow pipe 34 is a pipe through which the cooling liquid 144 from the outside of the heat exchanger 30 flows into one plate 32. The outflow pipe 36 is a pipe through which the cooling liquid 144 flows out from one plate 32 to the outside of the heat exchanger 30.

Each plate 32 is a member that forms a flow path of the cooling liquid 144, and includes a main body portion 38, a first communication portion 40, and a second communication portion 41, as shown in FIG. The main body portion 38 forms a general flow path in which the first fluid flows inside the plate 32. The first communication part 40 and the second communication part 41 form a communication flow path from one plate 32 to another plate 32 adjacent to the plate 32.

Specifically, each plate 32 includes a first plate plate 42 and a second plate plate 62.
The first plate plate 42 is a member formed in a ring shape. A wall portion protruding in the same direction is formed on the periphery of the first plate plate 42. Hereinafter, in the first plate plate 42, a surface from which the wall portion protrudes is referred to as an inner surface, and a surface opposite to the surface from which the wall portion protrudes is referred to as an outer surface.

The second plate plate 62 is a member formed in a ring shape. A wall portion protruding in the same direction is formed on the peripheral edge of the second plate plate 62. Hereinafter, in the second plate plate 62, a surface from which the wall portion protrudes is referred to as an inner surface, and a surface opposite to the surface from which the wall portion protrudes is referred to as an outer surface.

Each plate 32 is formed by engaging the outer surface of the wall portion of the second plate plate 62 with the inner surface of the wall portion of the first plate plate 42. Each plate 32 is formed so that the inner surfaces of the first plate plate 42 and the second plate plate 62 are not in contact with each other.

Thus, a gap is formed in each plate 32 between the inner surface of the first plate plate 42 and the inner surface of the second plate plate 62 constituting the plate 32. The gap functions as a flow path of the coolant 144, that is, a general flow path. And each plate 32 is arrange | positioned so that the outer surface of mutually adjacent plates 32 may be in the non-contact state which has the clearance gap 82 (refer FIG. 2).

Next, a first communication hole 54 is formed in the first plate plate 42. The first communication hole 54 is a circular opening having a diameter longer than the representative length D of the general flow path.
Further, in the first plate plate 42, the outer periphery of the first communication hole 54 in the first plate plate 42 is outside the outer end portion along the radial direction of the general flow path (that is, the main body portion 38). It is formed so that it may be located in.

The first communication portion 46 is a portion that stands on the first plate plate 42 from the periphery of the first communication hole 54 in a direction opposite to the wall portion of the first plate plate 42.
Further, the first plate plate 42 is provided with a second communication hole 56. The second communication hole 56 is a circular opening having a diameter DD longer than the representative length D of the general flow path. The typical length D of the general flow path referred to here is a representative length of a connection portion to the communication flow path in the general flow path, from one wall portion along the radial direction of the plate 32 to the other wall portion. Is the distance.

Further, in the first plate plate 42, the peripheral edge on the outer peripheral side of the second communication hole 56 in the first plate 42 is outside the outer end portion along the radial direction of the general flow path (that is, the main body portion 38). It is formed to be located.

The second communication part 48 is a part that stands upright from the peripheral edge of the second communication hole 56 formed in the first plate plate 42 in the direction opposite to the wall portion of the first plate plate 42.
The second plate plate 62 is provided with a third communication hole 74. The third communication hole 74 is a circular opening having a diameter longer than the representative length D of the general flow path.

Further, in the second plate plate 62, the outer peripheral edge of the third communication hole 74 in the second plate plate 62 is outside the outer end portion along the radial direction of the general flow path (that is, the main body portion 38). It is formed so that it may be located in.

The third communication part 66 is a part standing from the periphery of the third communication hole 74 in the second plate plate 62 in the direction opposite to the wall portion of the second plate plate 62.
A fourth communication hole 76 is formed in the second plate plate 62. The fourth communication hole 76 is a circular opening having a diameter longer than the representative length D of the general flow path.

Further, in the second plate plate 62, the outer peripheral edge of the fourth communication hole 76 in the second plate plate 62 is outside the outer end portion along the radial direction of the general flow path (that is, the main body portion 38). It is formed so that it may be located in.

The fourth communication part 68 is a part that stands upright from the peripheral edge of the fourth communication hole 76 in the second plate plate 62 in a direction opposite to the wall portion of the second plate plate 62.
And the 3rd communication part 66 formed in the 2nd plate board 62, and the 1st communication part 46 formed in the 1st plate board 42 which has the outer surface which counters the outer surface of the 2nd plate board 62, As a result of joining, the second communication part 41 is formed. The second communication portion 41 forms a flow path for allowing the coolant 144 from the inflow pipe 34 to flow into the plate 32 having the first plate plate 42. That is, the first communication hole 54 formed in the first plate plate 42 functions as an inlet for the cooling liquid 144 to the plate 32.

Also, a second communication portion 48 formed on the first plate plate 42, and a fourth communication portion 68 formed on the second plate plate 62 having an outer surface opposite to the outer surface of the first plate plate 42, Are joined, the first communication portion 40 is formed. The first communication part 40 forms a communication flow path for allowing the coolant 144 from the inside of the plate 32 having the first plate plate 42 to flow to the outflow pipe 36. That is, the second communication hole 56 formed in the first plate plate 42 functions as an outlet for the cooling liquid 144 from the plate 32.

Returning to FIG. 2, the heat exchanger 30 is arranged such that a gap 80 is formed between the inner peripheral edge of each plate 32 and the outer surface of the exhaust pipe 12. The heat exchanger 30 is arranged such that a gap 84 is formed between the peripheral edge of each plate 32 on the outer peripheral side and the inner surface of the outer shell member 20.

Thereby, in the heat exchanger 30 of this embodiment, the exhaust 142 flows through the gap 80, the gap 82, and the gap 84. The flow direction of the exhaust 142 is a direction along the radial direction of the heat exchanger 30.

Furthermore, in the heat exchanger 30, heat exchange is performed using the exhaust gas 142 flowing through the gap 80, the gap 82, and the gap 84 as a high-temperature fluid, and the cooling liquid 144 flowing in each plate 32 as a low-temperature fluid. That is, the heat exchange chamber 28 in which the heat exchanger 30 is disposed functions as the heat exchange unit 6.

The holding member 24 holds the heat exchanger 30 disposed in the heat exchange chamber 28.
The introduction member 88 connected to the holding member 24 is a cylindrical member having a diameter larger than the outer diameter of the exhaust pipe 12, and one end thereof is connected to the holding member 24.

The end of the introduction member 88 opposite to the side connected to the holding member 24 is formed in a diffuser shape that expands in diameter.
The introduction member 88 is disposed so that an opening over the entire circumference is formed between the exhaust downstream end 18 of the exhaust pipe 12. This opening functions as an inflow port through which the exhaust 142 flows from the exhaust unit 2 to the heat exchange unit 6, that is, the inflow unit 8.

The valve 10 includes at least a valve body 94 and a valve seat 96, and closes the exhaust part 2 (introduction member 88) when the valve body 94 contacts the valve seat 96.
In the present embodiment, the diffuser-shaped end portion of the introduction member 88 functions as the valve seat 96. However, the valve seat 96 in the present disclosure is not limited to this, and may be provided exclusively.

A mesh member 100 formed in a mesh shape is attached to the valve seat 96.
In addition, the valve 10 in this embodiment is opened when the liquid temperature of the coolant 144 of the internal combustion engine 140 is higher than a prescribed temperature that is prescribed in advance. On the other hand, the valve 10 is closed when the temperature of the coolant 144 of the internal combustion engine 140 is lower than the specified temperature.
<Effect of embodiment>
As described above, in the heat exchanger 30, the second communication hole 56 is formed as a circular opening having a diameter DD longer than the typical length D of the general flow path. For this reason, when the representative length in the first communication portion 40 is the diameter DD, the representative length of the first communication portion 40 is the representative length of the connection portion of the main body portion 38 to the communication flow channel in the general flow channel. Longer than D.

According to such a heat exchanger 30, the flow of the coolant 144 from the general flow path to the communication flow path can be made smooth, and the first communication section 40, the second communication section 41, and the main body section 38 can be made. It is possible to reduce the occurrence of stagnation at the connecting portion. Thereby, according to the heat exchanger 30, it can reduce that the temperature of the cooling fluid 144 rises, and can reduce that the cooling fluid 144 boils locally.

In particular, in the heat exchanger 30, the outer peripheral edge of the second communication hole 56 in the plate 32 is positioned outside the outer end portion along the radial direction of the general flow path (that is, the main body portion 38).
Therefore, according to the heat exchanger 30, the flow of the coolant 144 from the general flow path to the communication flow path can be made smoother, and stagnation occurs at the connection portion of the second communication portion 41. Can be reduced more reliably.
[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it is possible to implement in various aspects.

For example, in the above embodiment, the shape of the plate 32 of the heat exchanger 30 is a ring shape, but the shape of the plate in the heat exchanger of the present disclosure is not limited to the ring shape, and may be a rectangular shape. It may be other shapes.

Further, in the heat exchanger of the present disclosure, the plate 32 has a peripheral edge on the axial direction center side of the first communication hole 54 and the second communication hole 56 in the plate 32 of the general flow path (that is, the main body portion 38). You may form so that it may be located inside the edge part of the axial direction center side along radial direction. Further, in the heat exchanger of the present disclosure, the plate 32 has a peripheral edge on the axial direction center side of the third communication hole 74 and the fourth communication hole 76 in the plate 32 of the general flow path (that is, the main body portion 38). You may form so that it may be located inside the edge part of the axial direction center side along radial direction.

That is, in the heat exchanger according to the present disclosure, at least one of the one end and the other end of the communication portion is connected to one end and the other end of the connection portion in the general flow path (that is, the main body portion 38). What is necessary is just to be formed so that it may be located outside at least one of the parts. Further, the “one end portion and the other end portion in the communication portion” referred to here is not limited to the peripheral edge of the communication holes 54, 56, 74, 76 in the plate 32, but along the radial direction in the

communication portions

40, 41. One wall part and the other wall part may be sufficient.

In the above embodiment, the opening between the exhaust downstream end 18 and the introduction member 88 is formed as the inlet of the exhaust 142 from the exhaust pipe 12 to the heat exchange unit 6. The inlet of the exhaust 142 to the exchange unit 6 may be formed by making a hole in the exhaust pipe 12 itself.

Moreover, in the said embodiment, although the application object of the heat exchanger 30 was made into the exhaust heat recovery apparatus 1, the application object of the heat exchanger 30 is not restricted to the exhaust heat recovery apparatus 1. FIG.
In addition, the aspect which abbreviate | omitted a part of structure of the said embodiment is also embodiment of this invention. Further, an aspect configured by appropriately combining the above embodiment and the modification is also an embodiment of the present invention. Moreover, all the aspects which can be considered in the limit which does not deviate from the essence of the invention specified by the wording described in the claims are the embodiments of the present invention.

Claims

A heat exchanger that exchanges heat between a first fluid and a second fluid,
A plurality of plates having flow paths through which the first fluid flows and arranged adjacent to each other;
Each of the plates
A main body having a general flow path that is a flow path through which the first fluid flows in the plate;
A communication portion having a communication flow path that is a flow path from the plate to the other plate,
The communication part is
The heat exchanger is characterized in that a representative length in the communication channel is formed to be longer than a representative length of a connection portion to the communication channel in the general channel of the main body.
The representative length of the communication part is a distance from one end part to the other end part in the communication part,
The representative length of the connection part to the communication channel in the general channel of the main body is from one end of the connection part in a direction along one end of the communication part to the other end. The distance to the other end,
The communication part is
The at least one of the one end part and the other end part in the communication part is located outside at least one of the one end part and the other end part of the connection part. Heat exchanger.