JP6475006B2 - Heat exchanger - Google Patents

Description

  The present invention 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 having a general flow path that is a flow path of the first fluid in the plate. Furthermore, the heat exchanger described in Document 1 includes a communication portion as a flow path of the first fluid from one plate to another plate.

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

International Publication WO2012 / 095947

  For this reason, in the heat exchanger described in Patent Document 1, the first fluid from the general flow path collides with the flow path in the communication portion, and the flow of the first fluid in the vicinity of the communication portion is stagnant. There was a possibility. In the heat exchanger, when stagnation occurs, the temperature of the first fluid rises, and the first fluid may locally boil.

  Therefore, an object of the present invention is to reduce the occurrence of stagnation of the first fluid in the vicinity of the communicating portion in the heat exchanger.

One aspect of the present invention 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 of the plates includes a main body portion and a communication portion. 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 invention, the representative length in the communication flow path of the communication portion of each plate is formed to be longer than the representative length of the connection portion of the main body portion to the communication flow channel in the general flow path. 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 the present invention, it can reduce that the temperature of the 1st fluid rises, and can reduce that the 1st fluid boils locally.

  In one aspect of the present invention, 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 invention 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 invention, 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 located 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 which shows the external appearance of the exhaust heat recovery apparatus in 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. 1. It is a perspective view which shows schematic structure of the heat exchanger in embodiment.

Hereinafter, an exemplary embodiment of the present invention 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.

  In addition, the exhaust 142 in this embodiment is an example of the 2nd fluid described in the claim, and the cooling liquid 144 in this embodiment is an example of the 1st fluid described in the claim. It is.

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 that guides 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, an exhaust downstream end 18, which is the end opposite to the upstream end of the exhaust pipe 12, is disposed in a non-contact state with the shell member 4.

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.

In other words, 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 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 number of the plates 32, and is a positive integer of 2 or more.

  The inflow pipe 34 is a pipe through which the coolant 144 from the outside of the heat exchanger 30 flows into one plate 32. The outflow pipe 36 is a pipe through which the coolant 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 coolant 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 the 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 42 is a member formed in a disc shape having a circular opening at the center as a whole. 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 disk shape having a circular opening at the center. 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.

  Accordingly, 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. FIG.

  Next, the first communication portion 46 in the first plate plate 42 is a portion that stands upright from the periphery of the first communication hole 54 formed in the first plate plate 42 in the direction opposite to the wall portion. . Here, the first communication hole 54 is a circular opening having a diameter longer than the representative length D of the general flow path. The first communication hole 54 has an outer peripheral edge along the radial direction of the first plate plate 42 outside an outer end portion along the radial direction of the general flow path (that is, the first main body portion 44). It is formed so that it may be located in.

  The second communication part 48 is a part standing from the peripheral edge of the second communication hole 56 formed in the first plate plate 42 in the direction opposite to the wall part. Here, 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.

  The second communication hole 56 is such that the outer peripheral edge along the radial direction of the first plate plate 42 is outside the outer end portion along the radial direction of the general flow path (that is, the first main body portion 44). It is formed so that it may be located in.

  Further, the third communication portion 66 in the second plate plate 62 is a portion standing from the peripheral edge of the third communication hole 74 bored in the second plate plate 62 in the direction opposite to the wall portion. Here, the third communication hole 74 is a circular opening having a diameter longer than the representative length D of the general flow path. The third communication hole 74 is such that the outer peripheral edge along the radial direction of the second plate plate 62 is outside the outer end portion along the radial direction of the general flow path (that is, the second main body portion 64). It is formed so that it may be located in.

  The fourth communication portion 68 is a portion that stands up from the peripheral edge of the fourth communication hole 76 formed in the second plate plate 62 in the direction opposite to the wall portion. Here, the fourth communication hole 76 is a circular opening having a diameter longer than the representative length D of the general flow path. The fourth communication hole 76 has an outer peripheral edge along the radial direction of the second plate plate 62 outside the outer end portion along the radial direction of the general flow path (that is, the second main body portion 64). It is formed so that it may be located in.

  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.

  Further, the heat exchanger 30 is arranged such that a gap 80 is formed between the inner peripheral edge along the radial direction 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 outer peripheral edge along the radial direction of each plate 32 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.

  Further, 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 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 arranged so that an opening extending in the circumferential direction is formed between the exhaust pipe 12 and 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.

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 invention 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 second communication hole 56 has an outer peripheral edge along the radial direction of the plate 32 rather than an outer end portion along the radial direction of the general flow path (that is, the main body portion 38). It is formed so as to be located outside.

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 disc shape, but the shape of the plate in the heat exchanger of the present invention is not limited to a disc shape, and is a rectangular shape. It may be any other shape.

  Further, in the heat exchanger of the present invention, each of the first communication hole 54 and the second communication hole 56 has an axial periphery along the radial direction of the plate 32 and a general flow path (that is, a main body portion). 38) may be formed so as to be located on the inner side of the end portion on the axial center side along the radial direction. Further, in the heat exchanger of the present invention, each of the third communication hole 74 and the fourth communication hole 76 has a peripheral edge at the center in the axial direction along the radial direction of the plate 32 as a general flow path (that is, a main body portion). 38) may be formed so as to be located on the inner side of the end portion on the axial center side along the radial direction.

  That is, in the heat exchanger according to the present invention, at least one of the one end and the other end of the communicating portion is connected to one end and the other end of the connection portion in the general flow path (ie, 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, but one of the communication portions 40, 41 along the radial direction. A 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.

  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) )

Claims (2)

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 ring-shaped general flow path that is a flow path through which the first fluid flows inside the plate;
A communication portion having a communication channel having a circular cross section as a flow path from the plate to the other plate;
The communication part is
Heat exchanger size in the communication passage, characterized in that is formed to be greater than the radial width of the portion not facing the communication passage in the general flow path of the main body portion. In the communication portion, the end closest to the center of the general flow path is the inner end, the end farthest from the center is the outer end,
Before Killen communication portion,
2. The heat exchanger according to claim 1, wherein at least one of the inner end portion and the outer end portion of the communication portion is positioned outside at least one of an inner periphery and an outer periphery of the general flow path . .