JP2010229847A - Exhaust heat recovery equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide exhaust heat recovery equipment reduced in weight and size. <P>SOLUTION: The exhaust heat recovery equipment 10 includes a heat recovery chamber 15 for warming cooling water by the heat of exhaust gas, a bypass line 16 for bypassing the heat recovery chamber 15 to carry the exhaust gas, and a temperature sensitive valve 17 for carrying the exhaust gas into the bypass line 16 when the temperature of the cooling water is high and for carrying the exhaust gas into the heat recovery chamber 15 when the temperature of the cooling water is low. The heat recovery chamber 15 is arranged over the bypass line 16. As a result, the heat recovery chamber 15 facing a road surface is covered with the bypass line 16. Thus, the heat recovery chamber 15 is prevented from being grounded on the road surface. This eliminates the need to provide a cover separately for reducing damage during grounding, reducing the weight of the exhaust heat recovery equipment. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an exhaust heat recovery device that warms cooling water with the heat of exhaust gas.

  When the driving source of the vehicle is an internal combustion engine, exhaust gas is generated from the internal combustion engine. The cooling water is warmed by heat exchange with the heat held by the exhaust gas, and the vehicle interior is warmed by the heat of the warmed cooling water (see, for example, Patent Document 1 (FIG. 6)).

Patent document 1 is demonstrated based on the following figure.
As shown in FIG. 10, the exhaust heat recovery device 100 has a structure in which an exhaust passage 101 through which exhaust gas passes is surrounded by a heat transfer medium passage 102 through which cooling water passes. The heat of the exhaust gas passing through the exhaust passage 101 is transmitted to the cooling water in the heat transfer medium passage 102 via the heat exchange pipe 103, and the cooling water is warmed.

  By the way, the exhaust heat recovery device 100 may come into contact with the road surface 104 when the vehicle rides on the step 105 of the road surface 104 indicated by an imaginary line while the vehicle is traveling. Further, when the vehicle travels, pebbles are blown from the road surface 104 to the exhaust heat recovery device 100. Cooling water, which is a liquid, flows through the heat transfer medium passage 102. For this reason, when the exhaust heat recovery device 100 is actually used, it is necessary to take care such as attaching a cover to the outer peripheral surface of the heat transfer medium passage 102 for the purpose of reducing damage due to ground contact and protecting it from pebbles. The exhaust heat recovery unit becomes heavier by the weight of the cover.

  It is desirable to provide a lightweight and compact exhaust heat recovery device.

Table 2006-090725

  An object of the present invention is to provide a lightweight and compact exhaust heat recovery device.

The invention according to claim 1 is a heat recovery chamber in which exhaust gas is passed and cooling water is warmed by the heat of the exhaust gas, a detour that flows the exhaust gas around the heat recovery chamber, The exhaust gas is arranged at the inlet and flows into the bypass when the temperature of the cooling water is higher than a predetermined temperature, and flows into the heat recovery chamber when the temperature of the cooling water is equal to or lower than the predetermined temperature In the exhaust heat recovery device equipped with a temperature sensitive valve,
The heat recovery chamber is disposed on the bypass.

  According to a second aspect of the present invention, the temperature-sensitive valve includes a flow path switching damper that switches the flow path of the exhaust gas, and a rotation shaft that rotatably supports the flow path switching damper. The bypass path or the heat recovery chamber is closed when the leading end of the flow path switching damper comes into contact with the throttle surface of the configured exhaust gas inlet.

  In the invention according to claim 3, in the heat recovery chamber, a plurality of cooling water passages for allowing the cooling water to pass therethrough and a gas flow passage through which the exhaust gas passes are stacked in a sectional view, and the cooling water follows a predetermined forward path. It is characterized by being washed away.

  In the invention according to claim 4, the heat recovery chamber has a rectangular shape with a front cross-section and is arranged so that a plurality of gas flow paths are stacked in such a heat recovery chamber, and these gas flow paths are the same. It is a shape.

  In the invention according to claim 5, the heat recovery chamber is formed in any one of a bowl shape, a semicircle, a rectangle, a triangle, and a pentagon in a sectional view, and the detour is a bowl, a semicircle, a rectangle in a sectional view. It is formed in the shape of either a triangle or a pentagon.

In the invention according to claim 1, the heat recovery chamber is covered with a detour on the road surface. Thereby, it can prevent that a heat recovery chamber grounds with respect to a road surface. For this reason, it is not necessary to attach a separate cover or the like in order to reduce damage at the time of grounding. For this reason, a waste heat recovery device can be made lightweight and compact.
Further, by preventing the pebbles from hitting the heat recovery chamber, the life of the exhaust heat recovery device can be extended.

  In the invention according to claim 2, the tip of the flow path switching damper contacts the throttle surface of the exhaust gas inlet configured in the throttle shape. In order to make contact with the throttle surface, the flow path switching damper can be disposed at an angle closer to parallel to the flow of the exhaust gas. Thereby, exhaust gas can be introduced smoothly and exhaust gas can be efficiently flowed.

  In the invention according to claim 3, the cooling water is caused to flow along a predetermined route. That is, the cooling water is made to flow while repeating countercurrent and parallel flow. Thereby, cooling water can be poured through the whole heat recovery chamber. Since cooling water flows through the entire heat recovery chamber, the resistance to water flow is suppressed, and a pump or the like for sending the cooling water into the heat recovery chamber can be downsized. Thereby, size reduction can be achieved also as the whole waste heat recovery path.

  In addition, by flowing the cooling water along a predetermined route, the cooling water is allowed to flow through the heat recovery chamber for a predetermined time from being introduced into the heat recovery chamber to being discharged. As a result, the heat of the exhaust gas can be sufficiently efficiently transmitted to the cooling water.

  In the invention according to claim 4, the plurality of gas flow paths have the same shape. Since the gas flow paths have the same shape, the same parts can be used. By forming the gas flow path using the same components, the manufacturing cost of the gas flow path can be reduced.

  In the invention according to claim 5, the heat recovery chamber and the bypass are formed in any one of a bowl shape, a semi-circle shape, a rectangle shape, a pentagon shape, and a triangle shape in a sectional view. These shapes can be combined according to the place where the exhaust heat recovery unit is arranged. The exhaust heat recovery device can be made compact by adopting a shape that matches the arrangement location.

It is sectional drawing of the waste heat recovery device which concerns on this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. It is a side view of the waste heat recovery device concerning the present invention. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a figure explaining the temperature sensitive type valve concerning the present invention. It is a figure explaining 2nd Example. It is a figure explaining 3rd Example. It is a figure explaining the 4th example. 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 device 10 includes a cylindrical main body 11, an exhaust gas introduction part 12 connected to the upstream side (left side in the drawing) of the main body 11, and the exhaust gas introduction part 12. An exhaust gas discharge section 13 connected to the opposite side, a partition wall 14 that divides the main body 11 up and down, a heat recovery chamber 15 that is arranged on the upper portion of the partition wall 14 and that heats the cooling water by the heat of the exhaust gas, A detour 16 that is disposed below the heat recovery chamber 15 with the partition wall 14 interposed therebetween and bypasses the heat recovery chamber 15, and a cooling water that is disposed at the inlet of the detour 16 and has a temperature higher than a predetermined temperature. A temperature-sensitive valve 17 is sometimes used to flow the exhaust gas to the bypass 16 and flow the exhaust gas to the heat recovery chamber 15 when the temperature of the cooling water is lower than a predetermined temperature.

  In the heat recovery chamber 15, a cooling water inlet 21 for introducing cooling water, a plurality of cooling water paths 22 for allowing the cooling water introduced from the cooling water inlet 21 to pass therethrough, and a stack between these cooling water paths 22 are stacked. A water jacket including a plurality of gas passages 23 through which exhaust gas passes and a cooling water outlet (details will be described later) for discharging cooling water is arranged.

By arranging the heat recovery chamber 15 and the bypass 16 above and below the partition wall 14, the exhaust heat recovery device 10 can be made compact.
Details of the heat recovery chamber will be described with reference to the next figure.

  As shown in FIG. 2, the gas flow path 23 is welded to the flow path support members 24 and 24 on the side surfaces in the longitudinal direction, and the flow path support members 24 and 24 are welded to the side surfaces of the cooling water paths 22 and 23. . The cooling water guide holes 25 and 25 are formed by not arranging a part of the flow path support members 24 and 24.

  As indicated by the arrow (1), the cooling water flowing from the cooling water inlet 21 passes through the upper surface of the gas flow path 23 and the upper surface of the flow path support member 24 and reaches the cooling water guide holes 25 and 25. The cooling water that has reached the cooling water guide holes 25, 25 is allowed to flow downward (backward in the drawing) as indicated by an arrow (2).

At this time, the cooling water flows from the right to the left in the drawing. On the other hand, the exhaust gas flowing in the gas flow path 23 flows from the left to the right in the drawing. Based on the flow of exhaust gas, the flow of cooling water at this time is called countercurrent.
The flow of the cooling water flowing from the cooling water guide holes 25, 25 will be described with reference to the next drawing.

As shown by an arrow (3) in FIG. 3, the cooling water that flows from above flows toward the cooling water guide holes 25 and 25.
At this time, the cooling water flows from the left to the right in the drawing. Further, the exhaust gas flowing in the gas flow path 23 is also flowed from the left to the right in the drawing. The flow of the cooling water at this time is called a parallel flow based on the flow of the exhaust gas.

  The cooling water flowing from the cooling water guide holes 25, 25 is further flowed downward. The cooling water that has flowed downward flows in the counterflow direction through the cooling water channel 22 (see FIG. 2), and then flows to the outside of the heat recovery chamber 15.

From FIG. 2 and FIG. 3, it can be said that the cooling water flows along a predetermined route.
The cooling water is made to flow while repeating countercurrent and cocurrent flow. Thereby, cooling water can be poured through the whole heat recovery chamber. Since the cooling water flows through the heat recovery chamber 15 as a whole, the resistance to water flow is suppressed, and a pump for sending the cooling water into the heat recovery chamber 15 can be downsized. Thereby, it is possible to reduce the size of the exhaust heat recovery path 10 as a whole.

In addition, cooling water is caused to flow along a predetermined route. Thus, the cooling water is allowed to flow through the heat recovery chamber for a predetermined time from being introduced into the heat recovery chamber 15 until being discharged. As a result, the heat of the exhaust gas can be sufficiently efficiently transmitted to the cooling water.
Next, the cooling water outlet will be described.

  As shown in FIG. 4, the cooling water outlet 28 is provided via a cooling water tank 31 disposed on the outer surface of the main body 11. The cooling water tank 31 further includes a cooling water feed pipe 32 for sending cooling water to the temperature sensitive valve 17 and a cooling water feed pipe 33 for sending the cooling water fed by the cooling water feed pipe 32. Connected.

  The thermosensitive valve 17 is disposed on the tip of the thermowax 35 and contains a thermowax 35 containing wax that is melted as the temperature rises. Rod 36, a pin 39 at the tip of the rod 36 is connected to the long hole 38, and a lever 39 that is rotated when the rod 36 is moved to the left and right, and a rotation that rotatably supports the lever 39. The shaft 41 and a flow path switching damper 42 that is rotatably supported by the rotation shaft 41 together with the lever 39 and switches the flow path of the exhaust gas.

  The tip 45 of the flow path switching damper contacts the throttle surface 44 of the exhaust gas introduction part 12 configured in the throttle shape. In order to make contact with the throttle surface 44, the flow path switching damper 42 can be disposed at an angle closer to parallel to the flow of the exhaust gas. The exhaust gas can be introduced more smoothly as it is more parallel to the flow of the exhaust gas. That is, the exhaust gas can flow efficiently.

  If the operating range of the flow path switching damper 42 is narrowed, the drive source for operating the flow path switching damper 42 can be reduced in size, and the temperature sensitive valve 17 can also be reduced in size.

As shown in FIG. 5, the heat recovery chamber 15 has a rectangular shape with a front cross-section and is arranged so that a plurality of gas flow paths 23 are stacked in such a heat recovery chamber 15. 23 has the same shape. Further, the bypass 16 is also formed in a rectangular shape with a front cross section being horizontally long. Fins 47 are disposed in the gas flow path 23.
By making the detour 16 a horizontally long rectangle, the detour 16 can be compactly arranged in a small space.

  The plurality of gas flow paths 23 have the same shape. Since the gas flow paths 23 have the same shape, the same parts can be used. By forming the gas channel 23 using the same components, the manufacturing cost of the gas channel 23 can be reduced.

The heat recovery chamber 15 is covered with the detour 16 with respect to the road surface 48 indicated by the imaginary line. Thereby, it is possible to prevent the heat recovery chamber from being grounded with respect to the road surface 48. For this reason, it is not necessary to attach a separate cover or the like in order to reduce damage at the time of grounding. For this reason, the exhaust heat recovery device 10 can be made lightweight.
Further, by preventing the pebbles 49 from hitting the heat recovery chamber 15, the life of the exhaust heat recovery device 10 can be extended.
The details of the temperature sensitive valve will be described with reference to the following figure.

  As shown in FIG. 6, a return spring 52 that applies a force in a direction against the thermowax 35 is disposed in the case 51 in which the thermowax 35 and the rod 36 are accommodated.

  When the temperature of the cooling water sent from the cooling water inlet pipe 32 rises, the wax built in the thermo wax part 35 starts to melt. As the wax melts, the volume of the wax expands, and the thermo wax portion 35 expands toward the left side of the drawing against the force of the return spring 52. As a result, the rod 36 is moved leftward as indicated by the imaginary line, and the lever 39 and the flow path switching damper 42 are rotated clockwise about the rotation shaft 41. The inlet (15 in FIG. 1) of the heat recovery chamber is closed by the tip 45 of the flow path switching damper contacting the throttle surface (44 in FIG. 1).

On the other hand, when the temperature of the cooling water is lowered from the state indicated by the imaginary line, the wax in the thermo wax part 35 is solidified and the volume of the wax is reduced. As a result, the return spring 52 extends toward the right side of the drawing against the force of the thermowax 35. Accordingly, the rod 36 is moved rightward, and the lever 39 and the flow path switching damper 42 are rotated counterclockwise. When the flow path switching damper 42 contacts the throttle surface (reference numeral 44 in FIG. 1), the detour (reference numeral 16 in FIG. 1) is closed.
When it is desired to change the predetermined temperature at which the temperature-sensitive valve is operated, a different type of actuator may be replaced.

As the temperature-sensitive valve, various valves such as an electrically operated valve using a sensor and an actuator can be used in addition to a mechanically operated valve such as a thermo wax, a shape memory alloy spring, and a diaphragm.
When a mechanically operated valve is used, an expensive part such as a sensor or an actuator is unnecessary, so that the exhaust heat recovery device can be manufactured at a low cost.

Next, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 7, the exhaust heat recovery device 60 includes a heat recovery chamber 61 having a vertical cross section (a shape in which a semicircle is placed on a rectangular upper surface) and a pentagonal bypass 62 having a front cross section. Can be configured.

  Even in such a case, the heat recovery chamber 61 is covered by the bypass 62. Thereby, it is possible to prevent the heat recovery chamber 61 from being grounded. This eliminates the need for a separate cover or the like in order to reduce damage during grounding. For this reason, the effect of this invention that the waste heat recovery device 60 can be made lightweight can be acquired.

Next, Embodiment 3 of the present invention will be described with reference to the drawings.
As shown in FIG. 8, the exhaust heat recovery device 70 can also be configured by a triangular heat recovery chamber 71 in a front cross section and a bypass 72 in a semicircular shape in the front cross section.

  Even in such a case, the heat recovery chamber 71 is covered by the bypass 72. This can prevent the heat recovery chamber 71 from being grounded. This eliminates the need for a separate cover or the like in order to reduce damage during grounding. For this reason, the effect of this invention that the waste heat recovery device 70 can be made lightweight can be acquired.

  In addition to this, a combination of a heat recovery chamber (reference numeral 15 in FIG. 5) having a rectangular front cross section and a detour 72 having a semicircular front cross section shown in the first embodiment is optional.

  That is, the heat recovery chamber is formed in any one of a bowl shape, a semicircle, a rectangle, a triangle, or a pentagon in a front sectional view, and the detour has a bowl shape, a semicircle, a rectangle, a triangle, or a pentagon in a front sectional view. It is formed in any shape.

  These shapes can be combined according to the place where the exhaust heat recovery unit is arranged. The exhaust heat recovery device can be made compact by adopting a shape that matches the arrangement location.

Next, a fourth embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 9, in the exhaust heat recovery device 80, the actuator 82 of the temperature sensitive valve 17 is covered with a bypass 83 in addition to the heat recovery chamber 81 with respect to the road surface. As a result, the safety of the actuator 82 can be increased, which is further beneficial.

  The exhaust heat recovery device according to the present invention can be used as long as it uses exhaust heat from an engine such as a cogeneration system in addition to transportation equipment such as a vehicle, and its application is not limited.

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

  10, 60, 70, 80 ... exhaust heat recovery unit, 15, 61, 71, 81 ... heat recovery chamber, 16, 62, 72, 83 ... detour, 17 ... temperature sensitive valve, 22 ... cooling water channel, 23 ... Gas channel 41... Rotating shaft 42. Channel switching damper 43. Exhaust gas inlet 44. Restricted surface 45.

Claims (5)

A heat recovery chamber through which the exhaust gas is passed and the cooling water is warmed by the heat of the exhaust gas; a detour that bypasses the heat recovery chamber and flows the exhaust gas; and a cooling water that is disposed at the inlet of the detour A temperature-sensitive valve that flows the exhaust gas to the bypass when the temperature is higher than a predetermined temperature, and flows the exhaust gas to the heat recovery chamber when the temperature of the cooling water is equal to or lower than a predetermined temperature. In the heat recovery unit,
The exhaust heat recovery device, wherein the heat recovery chamber is disposed on the bypass. The temperature sensitive valve is composed of a flow path switching damper that switches the flow path of the exhaust gas, and a rotation shaft that rotatably supports the flow path switching damper.
2. The bypass circuit or the heat recovery chamber is closed when a tip of the flow path switching damper contacts a throttle surface of an exhaust gas inlet configured in a throttle shape. Waste heat recovery unit.   In the heat recovery chamber, a plurality of cooling water passages for allowing the cooling water to pass therethrough and gas passages through which the exhaust gas passes are stacked in a sectional view, and the cooling water is caused to flow along a predetermined forward path. The exhaust heat recovery device according to claim 1 or 2, characterized in that.   The heat recovery chamber has a rectangular shape with a front cross-section and is arranged so that a plurality of the gas flow paths are stacked in such a heat recovery chamber, and the gas flow paths have the same shape. The exhaust heat recovery device according to claim 3. The heat recovery chamber is formed in one of a bowl shape, a semicircle, a rectangle, a triangle, or a pentagon in a cross-sectional view,
4. The exhaust heat recovery according to claim 1, wherein the detour is formed in any one of a bowl shape, a semicircle, a rectangle, a triangle, and a pentagon in a cross-sectional view. vessel.

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