JP2012184680A - Exhaust heat recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust heat recovery device which is short in length to a height direction.SOLUTION: A rotating shaft 17 is penetrably supported to an extension part 28 which is formed by extending a valve chamber 16 upwardly, and a core case 21 being a body of a heat exchanger 12 is substantially formed into a U-shape, and extended to the upper part and both sides of a bypass passage 14. Since the bypass passage 14 is surrounded by the core case 21, heat transfer tubes 22 can dividedly be arranged in a plurality of positions. Since the heat transfer tubes 22 are divided into the plurality of positions, the number of the heat transfer tubes 22 arranged in the upper part of the bypass passage 14 can be reduced. Since the number of the heat transfer tubes 22 in the upper part of the bypass passage 14 is reduced, the length to the height direction of the exhaust heat recovery device 10 can be shortened.

Description

  The present invention relates to an exhaust heat recovery apparatus that warms a medium with the heat of exhaust gas.

  2. Description of the Related Art An exhaust heat recovery device that warms a medium in a heat exchanger with heat of exhaust gas generated in an internal combustion engine is known (see, for example, Patent Document 1 (FIG. 3)).

Patent document 1 is demonstrated based on the following figure.
As shown in FIG. 10, the exhaust heat recovery apparatus 100 includes an introduction port 101 for introducing exhaust gas, a first passage 102 extending upward from the introduction port 101, and a part of the first passage 102. A heat exchanger 103 for exchanging heat between the exhaust gas and the medium, a second passage 104 provided so as to bypass the first passage 102, a first passage 102 provided downstream of the second passage 104, and It consists of a valve 105 that opens and closes the second passage 104.

  The valve 105 closes the outlet 102a of the first passage 102 when the temperature of the medium in the heat exchanger 103 is higher than a predetermined temperature. By closing the first passage 102, the exhaust gas flows through the second passage 104. It flows through the second passage 104 and is discharged outside without performing heat exchange with the medium.

  The heat exchanger 103 is provided separately from the second passage 104. By being provided separately, the heat of the exhaust gas passing through the second passage 104 can be prevented from being transmitted to the heat exchanger 103.

By the way, when the exhaust heat recovery device is used in a vehicle, the exhaust heat recovery device is often attached to the bottom of the vehicle body. The distance between the bottom of the vehicle body and the road surface is short, and the exhaust heat recovery device attached to the bottom easily contacts the road surface.
Further, the bottom of the vehicle body has various other parts, and it is desired to make it as compact as possible in a limited space.

  It is desired to provide an exhaust heat recovery device with an excellent layout.

JP 2009-030369 A

  An object of the present invention is to provide an exhaust heat recovery apparatus having an excellent layout.

The invention according to claim 1 is provided with a branch part into which exhaust gas is introduced, a heat exchanger connected to the branch part for heating the medium by the heat of the exhaust gas, and one end provided separately from the heat exchanger. Is operated by the temperature of the medium, the bypass that is connected to the branch, the valve that is attached to the downstream end of the bypass to open and close the bypass, the valve chamber that is provided downstream of the valve and houses the valve, and And an exhaust heat recovery device comprising an actuator for rotating the rotating shaft,
The rotating shaft is penetrated and supported by an extension that extends upward from the valve chamber,
The core case which is the main body of the heat exchanger has a substantially U-shape and is extended along the upper side and both sides of the detour.

According to a second aspect of the present invention, there is provided a branch portion into which exhaust gas is introduced, a heat exchanger connected to the branch portion and warming the medium by the heat of the exhaust gas, and provided at a distance from the heat exchanger. Is operated by the temperature of the medium, the bypass that is connected to the branch, the valve that is attached to the downstream end of the bypass to open and close the bypass, the valve chamber that is provided downstream of the valve and houses the valve, and And an exhaust heat recovery device comprising an actuator for rotating the rotating shaft,
The rotating shaft is penetrated and supported by an extension that extends upward from the valve chamber,
The core case, which is the main body of the heat exchanger, has a substantially L shape and extends along the upper side and the side of the detour.

  In the invention which concerns on Claim 3, a heat exchanger is directly connected to a branch part via the connection port formed in the branch part, and a connection port exhibits the same shape as a core case, It is characterized by the above-mentioned.

  In the invention which concerns on Claim 4, the lower end of the detour is provided in the position lower than the lower end of a core case, It is characterized by the above-mentioned.

  The invention according to claim 5 is characterized in that the thermoactuator is arranged along the side surface of the detour that is opposite to the side where the core case is provided.

  In the invention according to claim 1, the core case has a substantially U shape in a cross-sectional view and extends along the upper side and both sides of the detour. Since the detour is surrounded by the core case, the heat transfer tubes can be divided into a plurality of positions. By dividing the heat transfer tubes into a plurality of positions, the number of heat transfer tubes arranged above the detour can be reduced. By reducing the number of heat transfer tubes above the detour, the length of the exhaust heat recovery device in the height direction can be shortened. That is, it can be said that the exhaust heat recovery apparatus is excellent in a low layout.

  In addition, the rotating shaft is penetrated and supported by an extension that extends upward from the valve chamber, and a part of the core case is disposed in front of the extension. By arranging the core case in the space in front of the extension, the space can be used effectively.

  Furthermore, the heat exchanger which is a heavy article can be arrange | positioned with sufficient balance by making a core case into substantially U shape.

  In the invention according to claim 2, the core case has a substantially L shape in a cross-sectional view, and extends along the upper side and one side of the detour. Since the detour is surrounded by the core case, the heat transfer tubes can be divided into a plurality of positions. By dividing the heat transfer tubes into a plurality of positions, the number of heat transfer tubes arranged above the detour can be reduced. By reducing the number of heat transfer tubes above the detour, the length of the exhaust heat recovery device in the height direction can be shortened. That is, it can be said that the exhaust heat recovery apparatus is excellent in a low layout.

  In addition, the rotating shaft is penetrated and supported by an extension that extends upward from the valve chamber, and a part of the core case is disposed in front of the extension. By arranging the core case in the space in front of the extension, the space can be used effectively.

In the invention which concerns on Claim 3, the shape of the connection port with which a heat exchanger is connected exhibits the same shape as a core case. By making the shape of the connection port the same as that of the core case, the exhaust gas can be easily guided to the heat transfer tube disposed in the core case. That is, the exhaust gas can flow smoothly.
On the other hand, the core case is arranged so as to surround a part of the detour. Since the core case has a shape surrounding a part of the detour, the heat transfer tubes disposed in the core case are each disposed in the vicinity of the detour. By disposing each heat transfer tube so as to surround the detour at a position near the center of the detour, the exhaust gas can be uniformly sent to each heat transfer tube.
That is, the exhaust gas can flow smoothly and uniformly through each heat transfer tube.

  In the invention which concerns on Claim 4, the lower end of the detour is provided in the position lower than the lower end of a core case. Under normal use conditions, the exhaust heat recovery device does not contact the road surface. However, it cannot be said that there is no possibility of the exhaust heat recovery device coming into contact with the projection by riding on an unexpected projection. In this case, the detour is grounded before the core case by providing the detour at a low position. The core case is protected by grounding the detour first.

  In the invention which concerns on Claim 5, the core case is extended along the side on the opposite side to where a thermo actuator is arrange | positioned. That is, the thermoactuator is arranged at a place where the core case is not arranged. The thermoactuator can be arranged close to the detour for the thickness of the core case. The exhaust heat recovery device can be made compact by bringing the thermo actuator closer to the detour.

It is a disassembled perspective view of the waste heat recovery apparatus which concerns on this invention. It is a perspective view of the waste heat recovery device concerning the present invention. 1 is a cross-sectional view of an exhaust heat recovery apparatus according to a first embodiment. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a figure explaining the state which the valve has opened the detour. It is a figure which contrasts the waste heat recovery apparatus which concerns on this invention, and a comparative example. It is sectional drawing of the waste heat recovery apparatus which concerns on Example 2. FIG. 6 is a cross-sectional view of an exhaust heat recovery apparatus according to Embodiment 3. FIG. It is a figure explaining the basic composition of the conventional technology.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

First, Embodiment 1 of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the exhaust heat recovery apparatus 10 includes a branch part 11 that branches the introduced exhaust gas into two flow paths, and a heat exchange that is connected to the downstream of the branch part 11 so that the medium flows inside. A heat exchanger 12, a thermoactuator 13 connected to the heat exchanger 12 and operating at the temperature of the medium in the heat exchanger 12, a bypass 14 bypassing the heat exchanger 12 to which the thermoactuator 13 is connected, A junction 15 through which the bypass 14 is passed and connected downstream of the heat exchanger 12, a valve chamber 16 connected downstream of the junction 15, and a rotating shaft 17 supported by the valve chamber 16 The valve 18 is fixed to the rotating shaft 17 and closes the downstream end 14b of the bypass 14.

The heat exchanger 12 includes a core case 21 formed in a substantially U-shape and a plurality of heat transfer tubes 22 housed in the core case 21.
The upstream end portion 12 a of the heat exchanger 12 is connected to the branch portion 11, and the downstream end portion 12 b is connected to the junction portion 15.

The detour path 14 includes a cylindrical main body 24 and a diameter-expanded portion 25 whose diameter is increased from the downstream side of the main body 24.
The downstream end 14 b of the detour 14 is accommodated in the valve chamber 16 and is closed by the valve 18.

  The valve chamber 16 includes a chamber portion 27 in which the valve 18 is accommodated, and an extension portion 28 that extends upward from the chamber portion 27 and protrudes upward. The rotary shaft 17 is supported by the extension 28.

  One end of the rotating shaft 17 is covered with a cap 31 attached to the side surface of the extension 28. A spring 32 that biases the valve 18 in the closing direction is attached to the other end of the rotating shaft 17, and a retaining plate 33 that prevents the spring 32 from coming off is attached. A lever member 34 for opening the valve 18 is attached to the retaining plate 33. Details are described in the following figure.

As shown in FIG. 2, the thermoactuator 13 is attached to the side of the heat exchanger 12, and the rod 36 of the thermoactuator 13 is in contact with the lever member 34.
As the temperature of the medium in the heat exchanger 12 increases, the rod 36 of the thermoactuator 13 moves forward as indicated by the arrow (1). The rod 36 moves forward against the force that the spring 32 tries to close the valve (FIG. 1, symbol 18).

In addition to the thermoactuator, any actuator can be used. Further, the mounting position of the actuator is not limited to the exhaust heat recovery apparatus main body (when directly connected to the heat exchanger 12).
Details of how the respective members are connected will be described with reference to the following drawings.

  As shown in FIG. 3, the branch portion 11 is closed together with a first base body 38 to which the heat exchanger 12 and the detour 14 are connected on the downstream side, and the first base body 38 and the first base body 38. It consists of the 1st cover body 39 which forms a cross section. The first lid body 39 is superimposed on the first base body 38 and welded to form the branch portion 11.

The first base body 38 is provided with a connection port 38a to which the heat exchanger 12 is connected and a connection port 38b to be connected to the bypass 14.
The first lid 39 is integrally provided with an exhaust gas introduction part 39a for introducing exhaust gas.

  The heat exchanger 12 and the bypass 14 are welded to the connection ports 38a and 38b of the branch part 11, respectively. By connecting and welding via the branch part 11, simple shaped members can be used for the heat exchanger 12 and the bypass 14. A simple-shaped member is connected to the branch portion 11 and welded. Since the shape of each member is simple, welding work can be easily performed.

  In addition, by covering the first base body 38 with the first lid 39, the branching portion 11 forms a closed cross section having a substantially rectangular shape in cross section. When the closed cross section is substantially rectangular, the branch portion 11 can be easily assembled, and the heat exchanger 12 and the bypass 14 can be easily welded, which is particularly beneficial.

The exhaust gas introduction part 39a side may be the first base, and the member to which the heat exchanger 12 and the detour 14 are connected may be the first lid.
That is, by forming the branch section 11 having a closed cross section, the heat exchanger 12 and the detour 14 can be easily welded.

  The junction 15 has the same basic configuration and operation as the branch 11. That is, it includes a second base 41 to which the heat exchanger 12 and the detour 14 are connected, and a second lid 42 that is superimposed on the second base 41 and forms a closed section together with the second base 41. .

The second base body 41 is provided with a connection port 41 a to which the heat exchanger 12 is connected and a connection port 41 b to be connected to the detour 14.
The second lid 42 is integrally provided with a connection port 42a to which the valve chamber 16 is connected.

  The rotating shaft 17 is penetrated and supported by an extension portion 28 extending upward from the valve chamber 16, and a part of the core case 21 is disposed in front of the extension portion 28 (upstream side). By arranging the core case 21 in the space in front of the extension portion 28, the space can be used effectively.

A medium flows between the core case 21 of the heat exchanger 12 and the heat transfer tube 22. When the temperature of the medium is low, the valve 18 is closed.
Since the valve 18 is closed, the exhaust gas introduced into the branch portion 11 flows toward the heat exchanger 12. The exhaust gas flows through the heat transfer tube 22 of the heat exchanger 12. By flowing in the heat transfer tube 22, heat exchange is performed with the medium flowing on the outer periphery of the heat transfer tube 22. That is, the medium is warmed. The exhaust gas that has warmed the medium and has fallen in temperature flows through the junction 15 and flows along the outer peripheral surface of the bypass 14 into the valve chamber 16.
The flow of exhaust gas when the detour 14 is closed will be described in more detail with reference to the next figure.

  As shown in FIG. 4, when the detour 14 is closed, the exhaust gas introduced into the branch part 11 is directed from the center O of the exhaust gas introduction part (FIG. 3, reference numeral 39 a) toward each heat transfer tube 22. (See arrow (2)). Alternatively, the exhaust gas flows into the heat transfer tube 22 while spreading along the first base 38.

By making the shape of the connection port 38 a the same shape as the core case 21 (U-shape), the exhaust gas can be easily guided to the heat transfer tube 22 arranged in the core case 21. That is, the exhaust gas can flow smoothly.
On the other hand, the core case 21 is disposed so as to surround a part of the bypass 14. Since the core case 21 has a shape surrounding a part of the detour 14, the heat transfer tubes 22 disposed in the core case 21 are respectively disposed in the vicinity of the detour 14. By disposing each heat transfer tube 22 so as to surround the detour 14 at a position near the center O of the detour 14, exhaust gas can be uniformly sent to each heat transfer tube 22.
That is, the exhaust gas can flow smoothly and uniformly through each heat transfer tube 22.
The upstream end portion 14 a of the bypass 14 and the upstream end portion 12 a of the heat exchanger 12 are connected to the branch portion 11.
The effect of using the U-shaped core case 21 will be described in detail with reference to the next figure.

As shown in FIG. 5, the core case 21 is provided on the periphery of the detour 14 while maintaining a predetermined distance from the detour 14.
The core case 21 has a substantially U-shape when viewed in cross section. By making it substantially U-shaped, the heat exchanger 12 that is a heavy object can be arranged in a well-balanced manner.

  In addition, since the bypass 14 is surrounded by the U-shaped core case 21, a part of the bypass 14 can be brought into contact with the outside air. Heat is not trapped between the bypass 14 and the heat exchanger 12 by contacting with the outside air. Since heat does not accumulate, it is possible to prevent heat from moving from the bypass 14 toward the heat exchanger 12 when heat exchange is not performed.

  Further, the core case 21 extends along the upper side and both sides of the bypass 14. When looking up the exhaust heat recovery device 10 from the ground, the detour 14 overlaps a part of the core case 21. Since the detours 14 overlap, the core case 21 can be protected against a stepping stone from the ground.

  As the medium continues to be heated with the exhaust gas, the temperature of the medium reaches a predetermined temperature. When the predetermined temperature is reached, the heat exchange is terminated. The detour 14 is opened and the exhaust gas is allowed to flow through the detour to complete the heat exchange. Details will be described in the next figure.

  As shown in FIG. 6, when the temperature of the medium reaches a predetermined temperature, the wax in the thermoactuator 13 expands to advance the rod 36. When the rod 36 moves forward, the rotary shaft 17 is rotated and the valve 18 is opened. When the valve 18 is opened, the exhaust gas passes through the bypass 14 and ends the heat exchange.

  When the temperature of the medium decreases again, the wax in the thermoactuator 13 contracts. The rod 36 is retracted by the action of a return spring in the thermo actuator 13. As the rod 36 moves backward, the valve 18 is closed.

  The rotary shaft 17 is supported by being penetrated by an extension portion 28 extending upward from the valve chamber 16, and a part of the core case 21 is disposed in front of the extension portion 28. By arranging the core case 21 in the space in front of the extension portion 28, the space in front of the extension portion 28 can be effectively utilized.

  In the exhaust heat recovery apparatus 10 of the type that supports the rotating shaft 17 with the extension 28 that extends the valve chamber 16, the effective use of the dead space in front of the extension 28 is a device that keeps the valve chamber 16 compact. It is effective to make the whole compact.

The exhaust gas introduction part 39 a, the branch part 11, the bypass circuit 14, and the valve chamber 16 are arranged on the same shaft 44. By disposing on the same shaft 44, the flow of the exhaust gas when the valve 18 is open can be made smooth.
The further effect | action of such an exhaust heat recovery apparatus 10 is demonstrated with a next figure.

  As shown in the comparative example in FIG. 7A, when a plurality of heat transfer tubes 112 are stacked in a rectangular core case 111, the length from the road surface R to the vehicle body bottom B is at least h1.

  On the other hand, as shown in the embodiment (b), when the U-shaped core case 21 is used, the heat transfer tube 22 s can be arranged on the side of the bypass 14. By arranging the heat transfer tube 22s on the side of the detour 14, the length from the road surface R to the vehicle body bottom B may be only h2. That is, h2 <h1.

  That is, by dividing the heat transfer tubes 22u, s into a plurality of positions with respect to the bypass route 14, the number of the heat transfer tubes 22u disposed above the bypass route 14 can be reduced. By reducing the number of heat transfer tubes 22u above the detour route 14, the length of the exhaust heat recovery device 10 in the height direction can be shortened.

Referring also to FIG. 4, the core case 21 is arranged so as to surround the detour 14, so that the length from the center O of the exhaust gas introduction portion (FIG. 3, reference numeral 39 a) to each heat transfer tube is substantially reduced. It can be made uniform. By making the length to each heat transfer tube uniform, exhaust gas can be made to flow uniformly to each heat transfer tube 22. By flowing the exhaust gas uniformly through each heat transfer tube 22, heat exchange can be performed efficiently. Moreover, since exhaust gas flows uniformly to each heat transfer tube 22, exhaust gas can be flowed smoothly.
Another embodiment of the exhaust heat recovery apparatus 10 will be described in the following figures.

Next, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 8, the lower end 51 c of the detour 51 having a substantially rectangular cross-sectional view is provided at a position lower than the lower end 52 c of the core case 52.

In a normal use state, the exhaust heat recovery device 50 does not contact the road surface. However, it cannot be said that there is no possibility of the exhaust heat recovery device 50 coming into contact with the projection by riding on an unexpected projection. In this case, the detour 51 is grounded before the core case 52 by providing the detour 51 at a low position. By grounding the bypass 51 first, the core case 52 in which the medium is stored is protected.
Still another embodiment will be described with reference to the following figure.

Next, Embodiment 3 of the present invention will be described with reference to the drawings.
As shown in FIG. 9, in the exhaust heat recovery device 60, the core case 62, which is the main body of the heat exchanger 61, has a substantially L shape and is extended along the upper side and the side of the detour 63. ing.

  Further, the thermoactuator 64 is disposed along the side surface of the detour path 63 opposite to the side where the core case 62 is provided.

  The thermoactuator 64 can be disposed closer to the detour 63 by the thickness of the core case 62. The exhaust heat recovery device 60 can be made more compact by bringing the thermoactuator 64 closer to the bypass 63.

The thermoactuator 64 can also be disposed along the side surface on the same side as the side where the core case is provided, of the side surface of the detour path 63.
Also in this case, the exhaust heat recovery device 60 can be compactly arranged by making the core case 62 substantially L-shaped.

  The exhaust heat recovery apparatus according to the present invention can be applied not only to an exhaust heat recovery device but also to an EGR (Exhaust Gas Recirculation) cooler or the like, and may be applied to other uses.

  The exhaust heat recovery apparatus of the present invention is suitable for a vehicle.

  10, 50, 60 ... Waste heat recovery device, 11 ... Branch, 12, 61 ... Heat exchanger, 13, 64 ... Thermoactuator, 14, 51, 63 ... Detour, 16 ... Valve chamber, 17 ... Rotating shaft, 18 ... valve, 21, 52, 62 ... core case, 28 ... extension, 38a ... connection port (to heat exchanger).

Claims (5)

A branch section for branching the introduced exhaust gas when the exhaust gas is introduced, a heat exchanger connected to the branch section for heating the medium by the heat of the exhaust gas, and spaced apart from the heat exchanger A detour having one end connected to the branch, a valve attached to a downstream end of the detour to open and close the detour, a valve chamber provided downstream of the valve and housing the valve, In an exhaust heat recovery apparatus comprising an actuator that operates at the temperature of the medium and rotates the rotating shaft,
The rotating shaft is supported by penetrating an extension that extends the valve chamber upward.
A core case which is a main body of the heat exchanger has a substantially U-shape and extends along the upper side and both sides of the detour. A branch section for branching the introduced exhaust gas when the exhaust gas is introduced, a heat exchanger connected to the branch section for heating the medium by the heat of the exhaust gas, and spaced apart from the heat exchanger A detour having one end connected to the branch, a valve attached to a downstream end of the detour to open and close the detour, a valve chamber provided downstream of the valve and housing the valve, In an exhaust heat recovery apparatus comprising an actuator that operates at the temperature of the medium and rotates the rotating shaft,
The rotating shaft is supported by penetrating an extension that extends the valve chamber upward.
A core case which is a main body of the heat exchanger has a substantially L shape and extends along the upper side and the side of the detour.   The said heat exchanger is directly connected to the said branch part via the connection port formed in the said branch part, The said connection port exhibits the same shape as the said core case, The Claim 1 or Claim characterized by the above-mentioned. 2. The exhaust heat recovery apparatus according to 2.   The exhaust heat recovery apparatus according to any one of claims 1 to 3, wherein a lower end of the detour is provided at a position lower than a lower end of the core case.   The exhaust heat recovery apparatus according to claim 2, wherein the actuator is disposed along a side surface of the bypass that is opposite to the side where the core case is provided.

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