JP2010031669A - Exhaust heat recovery apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deformation of a valve open/close device due to operation reaction force and greatly improve reliability in an exhaust heat recovery apparatus including the valve open/close device using a thermo actuator. <P>SOLUTION: One end part at which a first opening part of a first case 218 is fixed on an exhaust heat recovery apparatus body through a bracket 300, and another end part side at which the first opening part is not provided is fixed to an exhaust heat recovery apparatus body through a piping 113 for introducing cooling water. Consequently, operation reaction force of the valve open/close device is transmitted to the exhaust heat recovery apparatus body through the bracket 300 and the piping 113 for introducing cooling water. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust heat recovery device provided in an exhaust system of an internal combustion engine. In particular, the present invention relates to an exhaust heat recovery device including a valve opening / closing device that opens and closes a valve using a thermal expansion body that expands and contracts under the influence of a heat medium such as cooling water circulating in the exhaust heat recovery device.

  Conventionally, an exhaust heat recovery device is known as a device for recovering heat of exhaust gas of an automobile engine, and such an exhaust heat recovery device is installed in the middle of an exhaust pipe (for example, Patent Documents). 1).

  When the exhaust gas of the engine passes through an exhaust heat recovery unit installed in the middle of the exhaust pipe, heat exchange is performed between the engine exhaust gas and engine cooling water circulating through the exhaust heat recovery unit. The exhaust heat recovered by the engine cooling water circulating through the exhaust heat recovery device is used for heating the vehicle interior, for example. Further, in order to complete the warm-up operation of the engine at an early stage, the exhaust heat is recovered when the engine is cold (for example, at the start of the engine), and the coolant temperature is rapidly increased.

The exhaust heat recovery device disclosed in Patent Document 1 includes a valve for adjusting the heat recovery efficiency of exhaust heat, and the valve is opened and closed by the expansion and contraction operation of a thermoactuator. That is, the thermoactuator opens and closes the valve according to the temperature of the engine cooling water. When the engine is cold, the valve is closed to increase the heat recovery efficiency of the exhaust heat, and when the engine warm-up ends. The valve is opened to suppress the heat recovery efficiency of the exhaust heat.
JP 2008-25380 A

  By the way, the following problems are pointed out in the exhaust heat recovery device provided with the valve opening / closing device using the thermoactuator.

  When switching a gas path by driving a valve with a thermoactuator, it is required that the thrust of the thermoactuator be converted into a rotational motion. Deformation due to reaction force, deflection, and as a result, it is necessary to guarantee the operation stroke of the output rod. For this purpose, sufficient space is required or the size of the valve opening / closing device is increased. As a result, both cost and space are restricted.

  This is because when the recovery / non-recovery of the exhaust heat recovery device is controlled by the exhaust gas dynamic pressure and the temperature of the cooling water (heat medium), the valve is provided with a holding force that can withstand the specified dynamic pressure. This is because a large driving force is required for medium temperature driving, and a balance is required between the holding force of the valve opening / closing device itself, the holding force of the output rod, and the reduction of the reaction force that bends the output rod. For example, in order to stabilize the operation, there is no choice but to increase the valve to reduce the operating angle, or to enlarge the valve opening / closing device to ensure a sufficient operating stroke even if there is some deformation. It is a fact.

  The present invention has been made in view of the above, and in an exhaust heat recovery device equipped with a valve opening / closing device using a thermoactuator, the deformation of the valve opening / closing device due to an operating reaction force is prevented, thereby greatly improving its reliability. The purpose is to let you.

  In order to achieve the above object, an exhaust heat recovery device according to the present invention is a thermoactuator that expands and contracts an output section by expanding and contracting a thermal expansion body under the influence of a heat medium circulating in the exhaust heat recovery device body. A rod provided so as to be interlocked with the expansion / contraction operation of the output portion, a power transmission mechanism that operates a valve provided on the exhaust heat recovery device body by being pressed by a tip portion of the rod, and the thermoactuator A first case provided with a first opening that can be inserted and removed from the thermoactuator on one side thereof, and a rod for receiving the rod. And a second case provided with a second opening in which one of the rods can be inserted and removed, and the first and second cases have the first case and the second case. An exhaust heat recovery device having a valve opening / closing device fixed to each other in a state where the opening and the second opening are overlapped with each other, wherein the first case of the first case One end of the side where the opening is provided is fixed to the exhaust heat recovery body through a bracket, while the other end side where the first opening is not provided is It is fixed to the exhaust heat recovery device main body through a heat medium introduction pipe.

  In the above configuration, one end of the first case where the first opening is provided is fixed to the exhaust heat recovery device body via the bracket, while the first opening is provided. Since the other end of the other side is fixed to the exhaust heat recovery device main body via the heat medium introduction pipe, the reaction force of the valve opening / closing device is affected via the bracket and the heat medium introduction pipe. It is transmitted to the exhaust heat recovery unit body. As a result, deformation of the valve opening / closing device due to the reaction force is prevented, and its reliability is greatly improved.

  In the exhaust heat recovery device, the second case includes a first case member provided with the second opening, and a second case attached to the other end of the first case member. A rod through hole is formed in the other end surface of each of the first and second case members, and a rubber seal having an annular shape is formed in the rod through hole on the first case member side. Is attached to the rod through hole on the second case member side, and an annular holding member is attached, and the rod is slidably held by the rubber seal and the holding member. .

  In the above configuration, the rubber seal having an annular shape is attached to the rod through hole on the first case member side, and the holding member having an annular shape is attached to the rod through hole on the second case member side, Since the rubber seal and the holding member hold it slidably, the holding force of the rod is ensured.

  Furthermore, in the exhaust heat recovery device, a flange portion extending in a circumferential direction is formed on the distal side of the proximal end portion of the rod, and the rod includes the flange portion of the rod and the first case member. And the two members of the rubber seal and the holding member.

  In the above configuration, the rod is supported by the contact between the flange portion of the rod and the first case member, and the rubber seal and the holding member, so that the reaction force for bending the rod can be reduced. it can.

  According to the present invention, in an exhaust heat recovery device equipped with a valve opening / closing device using a thermoactuator, it is possible to prevent the valve opening / closing device from being deformed due to an operating reaction force, thereby greatly improving its reliability.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 4 show an exhaust heat recovery device 100 according to an embodiment of the present invention. The exhaust heat recovery device 100 is installed as a part of an exhaust system such as an automobile engine. 1 is a side view of the exhaust heat recovery device 100, FIG. 2 is a plan view of the exhaust heat recovery device 100, FIG. 3 is a cross-sectional view taken along the line AA of FIG. .

<Exhaust heat recovery device>
The exhaust heat recovery device 100 is mainly composed of an inner cylinder portion 102, a valve 103, cooling water passages 104a and 104b, heat recovery exhaust gas passages 105a and 105b, an outer cylinder portion 106, and the like. The inner cylinder portion 102 and the outer cylinder portion 106 are so-called exhaust pipes and constitute the main body of the exhaust heat recovery device 100.

  An exhaust gas introduction port 102a that is connected to a component on the upstream side and into which exhaust gas is introduced from the upstream side is formed at the exhaust system upstream side (hereinafter simply referred to as “upstream side”) end portion of the inner cylinder portion 102. Has been. On the other hand, a valve seat 102c is formed in the opening 102b at the end of the inner cylinder portion 102 on the downstream side of the exhaust system (hereinafter simply referred to as “downstream side”). The valve 103 is detachably fitted into the valve seat 102c, and the opening 102b of the inner cylinder portion 102 is opened and closed. In addition, on the downstream side of the inner cylinder portion 102 (slightly upstream from the valve 103), a large number of communication holes 102d that communicate the inner and outer spaces of the inner cylinder portion 102 are formed.

  The cooling water passages 104 a and 104 b and the heat recovery exhaust gas passages 105 a and 105 b are formed between the inner cylinder portion 102 and the outer cylinder portion 106. That is, the inner heat recovery exhaust gas flow path 105a, the inner cooling water flow path 104a, the outer heat recovery exhaust gas flow path 105b, and the outer cooling water flow path 104b are formed in order from the inner cylinder portion 102 to the outer side. The inner cooling water flow path 104a and the outer cooling water flow path 104b communicate with each other so that the cooling water (heat medium) can be circulated by the communication portion H at a plurality of locations.

  The outer cylinder portion 106 constitutes the outer peripheral wall of the outer cooling water flow path 104b and extends further downstream from the location where the valve 103 is disposed. A downstream end portion of the outer tube portion 106 is connected to an exhaust system constituent member on the downstream side of the exhaust heat recovery device 100, and a discharge port 106a for discharging the exhaust gas that has passed through the outer tube portion 106 is formed. Yes. In addition, between the upstream end portion of the outer cylinder portion 106 and the outer peripheral surface of the inner cylinder portion 102, the outer peripheral surface of the inner cylinder portion 102 and the downstream end portion of the inner cooling water flow path forming member 107 are separated by a closing member 109. In the meantime, the exhaust gas is closed by the closing member 110, and the introduced exhaust gas is guided to a desired flow path.

  A valve shaft 201 for opening and closing the valve 103 is passed through the outer cylinder portion 106. A constricted portion 106 </ b> A constricted inward as shown in FIG. 3 is formed at and near the through portion of the valve shaft 201 of the outer cylinder portion 106.

  On the other hand, as shown in FIGS. 1 and 2, the side bottom portion of the outer cylinder portion 106 communicates with the inner cooling water flow path 104a and the outer cooling water flow path 104b, and the cooling water is introduced into the cooling water flow paths 104a and 104b. A cooling water introduction pipe 113 is connected. In addition, a cooling water discharge pipe 114 is connected to the upper portion of the outer cylinder portion 106 so as to communicate with the outer cooling water flow path 104b and discharge the heated cooling water.

<Valve open / close device for exhaust heat recovery device>
Next, the opening / closing device for the valve 103 of the exhaust heat recovery device 100 will be described in detail.

  The valve 103 of the exhaust heat recovery device 100 opens and closes when the driving force of the thermoactuator 215 is transmitted through a rod 213 and a power transmission mechanism described later.

  As shown in FIG. 5, the thermoactuator 215 includes a thermal expansion body 221, a thermal expansion body case 222, a pressure receiving member 223, an output piston portion 224, an O-ring 225, and the like, and circulates through the exhaust heat recovery device 100. The output piston part 224 is expanded and contracted by expanding and contracting the thermal expansion body 221 under the influence of the cooling water (heat medium).

  For example, wax is used for the thermal expansion body 221.

  The thermal expansion body case 222 contains the thermal expansion body 221 in a sealed manner. For the thermal expansion body case 222, for example, a material having excellent thermal conductivity and corrosion resistance such as stainless steel is preferably used. Further, an O-ring groove 222a is formed on the outer peripheral portion of the thermal expansion body case 222, and an O-ring 225 is attached thereto.

  The pressure receiving member 223 is made of a flexible material such as rubber with a built-in output piston portion 224. The pressure receiving member 223 is disposed in the thermal expansion body 221 and is deformed as the thermal expansion body 221 expands and contracts to move the output piston portion 224 in the axial direction. That is, when the thermal expansion body 221 expands, the pressure receiving member 223 is deformed by the pressure increase of the thermal expansion body 221 and extends the output piston portion 224 (moves forward to the right side in the drawing). On the other hand, when the thermal expansion body 221 contracts, the pressure receiving member 223 is deformed by the pressure drop of the thermal expansion body 221 and contracts the output piston portion 224 (moves to the left in the figure).

  The output piston part 224 is an output part of the thermoactuator 215 and is built in the pressure receiving member 223. As shown in the figure, the tip end portion 224a of the output piston portion 224 has a shape that bulges in a substantially hemispherical shape in the axial direction.

  The thermoactuator 215 is inserted and accommodated in the first case 218. The first case 218 has a cylindrical body, one opening of which is a first opening 218c into which the thermoactuator 215 can be taken in and out, and the other opening is a cooling water introduction pipe 113. The cooling water inlet 218a for introducing the cooling water from is provided. Further, a flange portion 218d and a bracket 300 are formed on the distal side of the first case opening 218c. As shown in FIGS. 1 and 2, the first case 218 is interposed via the flange portion 218d. The second case 219, which will be described later, is fixed. One end of the first case 21 where the first opening 218c is provided is fixed to the outer cylinder 106 (exhaust heat recovery device main body) via the bracket 300, and The other end side of the side where the cooling water introduction port 218a is provided (the side where the first opening 218c is not provided) is connected to the outer cylinder part 106 (exhaust heat recovery) via the cooling water introduction pipe 113. It is fixed to the main body.

  The first case 218 is interposed in the middle of the cooling water introduction pipe 113, and the cooling water circulating through the exhaust heat recovery device 100 passes through the first case 218. At least a pipe constituting the downstream side of the first case 218 of the cooling water introduction pipe 113 (hereinafter, also referred to as “downstream pipe”) uses a highly rigid material such as a stainless steel pipe, As described above, it plays the role of fixing the first case 218 to the outer cylinder portion 106 (exhaust heat recovery device main body). The downstream end of the downstream pipe communicates with the cooling water flow paths 104a and 104b.

  An element locking member 227 is fixed to the cooling water inlet 218a of the first case 218. The element locking member 227 locks the movement of the thermoactuator 215 in the axial direction (left side in the drawing) of the thermal expansion body case 222. Since the element locking member 227 has a porosity, the cooling water introduced from the cooling water introduction port 218 a passes through the porosity of the element locking member 227 and flows into the first case 218. It has become.

  The cooling water circulating through the exhaust heat recovery device 100 is introduced from the cooling water inlet 218 a of the first case 218 and filled around the thermal expansion body case 222. The cooling water exerts a thermal effect on the thermal expansion body 221 through the thermal expansion body case 222, and is then sent from the cooling water discharge port 218b to the cooling water flow paths 104a and 104b in the outer cylindrical portion 106. The cooling water introduced from the cooling water inlet 218a of the first case 218 is prevented from leaking out from the first case opening 218c by the O-ring 225.

  For example, as shown in FIG. 5, the rod 213 has a pressing portion 213 a that is pressed by the output piston portion 224 in the vicinity of the axis of the base end portion. The pressing portion 213a has a shape that is recessed in a conical shape in the axial direction. This makes it easier for the output piston portion 224 to press the pressing portion 213a on the axis, and simplifies maintenance work such as a thermoactuator described later. Further, a flange portion 213b extending in a flange shape along the circumferential direction is formed on the distal side of the proximal end portion of the rod 213. The flange portion 213b functions as an engaging portion of a compression coil spring 228 described later.

  The rod 213 is provided so as to be interlocked with the expansion / contraction operation of the output piston portion 224 of the thermo actuator 215. That is, the tip 224a of the output piston portion 224 of the thermoactuator 215 is disposed at a position where the pressing portion 213a of the rod 213 can be pressed, and further the rod 213 is pressed toward the output piston portion 224 of the thermoactuator 215. A compression coil spring (hereinafter simply referred to as “coil spring”) 228 is provided as a pressing member.

  The second case 219 includes a first case member 219e and a second case member 219f, and forms a cylindrical body.

  The rod 213 and the coil spring 228 are provided in the first case member 219e of the second case 219. One opening of the first case member 219e is a second opening 219a through which the rod 213 and the coil spring 228 can be inserted and removed, and the other opening is a through-hole (hereinafter simply referred to as a through hole) of the rod 213. It is called “rod through hole”) 219d. A second case member 219f is attached to the other end of the first case member 219e provided with the rod through hole 219d. The other opening of the second case member 219f is also a through hole (hereinafter simply referred to as “rod through hole”) 219g of the rod 213.

  That is, the second case 219 includes a first case member 219e provided with a second opening 219a, and a second case member 219f attached to the other end of the first case member 219e. Rod through holes 219d and 219g are formed on the other end surfaces of the first and second case members 219f, respectively. An annular rubber seal 230 is attached to the rod through hole 219d on the first case member 219e side, and an annular resin is placed on the rod through hole 219g on the second case member 219f side. The holding member 400 made of is attached. The rod 213 is slidably held by the rubber seal 230 and the holding member 400. As a result, the gap between the rod 213 and the rod through-hole 219g of the first and second case members 219f is filled, and the entry of dust and the like from the outside of the second case 219 into the second case 219 is prevented. Figured.

  The rod 213 is supported by the contact between the flange 213b of the rod 213 and the first case member 219e, and the rubber seal 230 and the holding member 400.

  A flange portion 219b for fixing to the first case 218 is provided around the second opening 219a of the first case member 219e, and the flange portion 219b and the flange of the first case 218 are provided. The portion 218d is fastened and fixed by a fastener such as a bolt 226a and a nut 226b with the seal gasket 220 interposed therebetween. That is, the first case 218 and the second case 219 are detachably fixed to each other in a state where the first opening 218c and the second opening 219a are overlapped.

  One end portion of the coil spring 228 is engaged with a spring engaging portion (a flange portion) 213b formed on the proximal end side of the rod 213, and the other end portion is a first case member 219e of the second case 219. Is engaged with a spring retainer 219c provided inside the rod through hole 219d.

  The power transmission mechanism presses the tip 213c of the rod 213 to operate the valve 103 provided in the exhaust heat recovery device 100 to the open side. The power transmission mechanism includes a valve shaft 201 to which a valve 103 that rotates about an axis for opening and closing the valve 103 is fixed, a shaft lever 214 fixed to the valve shaft 201, and the like.

  As shown in FIG. 3, one side of the valve 103 is fixed to the valve shaft 201 with a fixing tool 202 such as a screw, and the valve 103 is externally rotated by rotating the valve shaft 201 in the forward and reverse directions. An opening / closing operation is performed in the cylindrical portion 106.

  One end side of the valve shaft 201 passes through the outer cylinder portion 106 obliquely downward. The valve shaft 201 is accommodated in a shaft case 203 installed between the constricted portions 106 </ b> A and 106 </ b> A of the outer cylinder portion 106, and is freely rotatable by bearings 204, 204, 205 fixed near both ends in the shaft case 203. It is supported by. The shaft case 203 also passes through the outer cylinder portion 106. In addition, a window portion 203 a for securing a movable region of the valve 103 is formed in an intermediate portion of the shaft case 203.

  A labyrinth 206 that suppresses leakage of exhaust gas is fitted between the bearings 204 and 204. On the other hand, the obliquely upper opening of the shaft case 203 is sealed by a sealing cap 207 so that exhaust gas does not leak out from the outer cylinder portion 106 through the opening.

  A torsion coil spring (hereinafter simply referred to as “coil spring”) 209 that urges the valve shaft 201 to rotate in the direction in which the valve 103 is closed is disposed around the shaft case 203 and the oblique lower end side of the valve shaft 201. Has been. One end of the coil spring 209 is engaged with the shield 210, and the other end is engaged with a spring engaging portion 211 (see FIG. 5) fixed to the tip of the exposed portion 201a of the valve shaft 201. The shield 210 covers the coil spring 209 and the shaft lever 214 to protect them from splashing mud and splashing water.

  A shaft lever 214 is fixed to the oblique lower end portion of the valve shaft 201. The shaft lever 214 is disposed at a position where it can be pressed by the tip 213c of the rod 213. When the axial lever pressing force of the rod 213 is received, the valve shaft 201 and the valve 103 are opened according to the amount of movement of the rod 213. Rotate to. In the present embodiment, a cam-like member is used as the shaft lever 214.

<Operation of exhaust heat recovery valve>
Hereinafter, the operation principle of the valve 103 that opens and closes according to the temperature of the cooling water circulating through the exhaust heat recovery device 100 will be described.

  The cooling water circulating through the exhaust heat recovery device 100 is introduced into the first case 218 from the cooling water inlet 218a of the first case 218, and has a thermal effect on the thermal expansion body 221 via the thermal expansion body case 222. Effect.

  In the process of increasing the temperature of the cooling water, the temperature of the thermal expansion body 221 also rises and the thermal expansion body 221 expands, so that the output piston portion 224 extends. Then, as shown in FIG. 6, the output piston portion 224 presses the pressing portion 213 a of the rod 213 to extend the rod 213 from the second case 219. As the rod 213 extends, the tip 213c of the rod 213 presses the shaft lever 214 against the urging force of the coil spring 209 and rotates the shaft lever 214 and the valve shaft 201. As the valve shaft 201 rotates, the valve 103 moves to the open side. The shape (cam shape) of the shaft lever 214 is set so that the heat recovery efficiency of the exhaust heat recovery device 100 becomes an optimum value according to the temperature of the cooling water.

  When the valve 103 is fully opened, most of the exhaust gas introduced into the inner cylinder portion 102 passes through the inner cylinder portion 102 and is connected to the exhaust port 106a of the outer cylinder portion 106 on the downstream side. Is discharged. As a result, the heat recovery rate of the exhaust gas decreases.

  On the other hand, in the temperature lowering process of the cooling water, the temperature of the thermal expansion body 221 also decreases and the thermal expansion body 221 contracts, so that the output piston part 224 contracts. Then, the rod 213 contracts into the second case 219 by the pressing force of the coil spring 228, and the shaft lever 214 and the valve shaft 201 in which the pressing force of the rod 213 is released are closed by the biasing force of the coil spring 209. To work. When the valve 103 is closed, most of the exhaust gas introduced into the inner cylinder portion 102 sequentially passes through the communication hole 102d and the heat recovery exhaust gas passages 105a and 105b, and then is discharged into the outer cylinder portion 106. A flow path is formed toward the 106a side. As a result, the heat recovery efficiency of the exhaust gas increases.

<Disassembly and assembly of exhaust heat recovery valve opening / closing device>
Next, disassembly / assembly of the valve opening / closing device of the exhaust heat recovery device will be described.

  First, as shown in FIG. 5, a case will be described in which the temperature of the cooling water is equal to or lower than a predetermined temperature and the output piston portion 224 and the rod 213 of the thermoactuator 215 are decomposed and contracted. In this case, first, the bolt 226a and the nut 226b that fasten the flange portions 218d and 219b of the first case 218 and the second case 219 are removed. Then, the second case 219 separates from the first case 218 fixed to the exhaust heat recovery device body by the elastic force of the coil spring 228 in a compressed state. Next, as shown in FIG. 7, the second case 219 containing the rod 213, the coil spring 228 and the like is rotated around the proximal end side of the rod 213, and the distal end portion 213c of the rod 213 is moved from the shaft lever 214. By detaching, the second case 219 can be detached from the first case 218 and removed.

  After the second case 219 is removed from the first case 218, the rod 213 and the coil spring 228 can be easily extracted from the second opening 219a of the second case 219. The extracted rod 213 and coil spring 228 are subjected to maintenance such as inspection, cleaning, repair and replacement (hereinafter simply referred to as “maintenance”), or after being replaced with a new one, and then placed in the second case 219. Will be housed again.

  Furthermore, as shown in FIG. 8, the thermoactuator 215 accommodated in the first case 218 can be easily extracted from the first case 218. The extracted thermoactuator 215 is subjected to maintenance or is replaced with a new thermoactuator 215 and then accommodated in the first case 218 again.

  Once the thermoactuator 215 is accommodated in the first case 218 and the rod 213 and the coil spring 228 are accommodated in the second case 219, the original state shown in FIG. It can be easily restored.

  Next, as shown in FIG. 6, a case will be described in which the output piston portion 224 and the rod 213 of the thermoactuator 215 are disassembled in an extended state. Also in this case, the bolts 226a and nuts 226b that fasten the flange portions 218d and 219b of the first case 218 and the second case 219 are removed first. At this time, the second case 219 is separated from the first case 218 by the elastic force of the coil spring 228 in a compressed state.

  Next, as shown in FIG. 9, the second case 219 containing the rod 213, the coil spring 228, etc. is rotated around the base end of the rod 213, and the tip 213 c of the rod 213 is moved from the shaft lever 214. Let go. At this time, since the pressing portion 213a of the rod 213 that is in contact with the tip portion 224a of the output piston portion 224 has a conical shape that is recessed in the axial direction, the second case 219 is smoothly rotated. . After the distal end portion 213c of the rod 213 is detached from the shaft lever 214, the second case 219 can be separated from the first case 218 and removed.

  After removing the second case 219, the rod 213 and the coil spring 228 can be easily extracted from the second case opening 219a of the second case 219, and maintenance is performed on the extracted rod 213 and the coil spring 228. After being applied, it is housed again in the second case 219.

  Further, as described with reference to FIG. 8, the thermoactuator 215 accommodated in the first case 218 can be easily extracted from the first case 218. The extracted thermoactuator 215 is subjected to maintenance or is replaced with a new thermoactuator 215 and then accommodated in the first case 218 again. After the thermoactuator 215 is accommodated in the first case 218, it can be returned to the original state shown in FIG. Of course, when the temperature of the cooling water and the thermal expansion body 221 decreases during the maintenance operation, the output piston 224 and the rod 213 are disassembled and assembled in a further contracted state than the original state shown in FIG.

<Action and effect>
According to the present embodiment, the following operations and effects are achieved.

  One end of the first case 218 provided with the first opening 218c is fixed to the exhaust heat recovery device main body via the bracket 300, while the first opening 218c is provided. Since the other end side that is not present is fixed to the exhaust heat recovery device main body via the cooling water body introduction pipe 113, the operating reaction force of the valve opening / closing device is the above bracket 300 and the cooling water introduction pipe 113. Is transmitted to the exhaust heat recovery unit main body. As a result, deformation of the valve opening / closing device due to the reaction force is prevented, and its reliability is greatly improved.

  In the second case 219, a rubber seal 230 having an annular shape is attached to the rod through hole 219d on the first case member 219e side, and an annular shape is provided on the rod through hole 219g on the second case member 219f side. Since the holding member 400 is mounted and the rod 213 is slidably held by the rubber seal 230 and the holding member 400, the holding force of the rod 213 is secured.

  Further, since the rod 213 is supported by the contact between the flange portion 213b and the first case member 219e and the two members of the rubber seal 230 and the holding member 400, the reaction force for bending the rod 213 is reduced. be able to.

  As described above, according to the present embodiment, it is possible to easily meet the balance request for reducing the holding force of the valve opening / closing device itself, the holding force of the rod 213, and the reaction force that bends the rod 213.

  Note that the present invention is not limited to the above-described embodiment, and various design changes and modifications can be made within the scope of the appended claims.

It is a side view of the exhaust heat recovery device in the embodiment of the present invention. It is a top view of the exhaust heat recovery device in an embodiment of the invention. It is AA sectional drawing of FIG. It is a longitudinal cross-sectional view of the exhaust heat recovery device in the embodiment of the present invention. It is sectional drawing which showed a thermoactuator and its peripheral part, Comprising: Comprising: The state which the rod shrunk in the 2nd case is shown. It is sectional drawing which showed a thermoactuator and its peripheral part, Comprising: The state which the rod extended from the 2nd case is shown. It is sectional drawing which showed a thermo actuator and its peripheral part, Comprising: The case where a 2nd case is removed in the state which the rod contracted in the 2nd case is shown. It is a figure which shows the state which removes a thermo actuator from a 1st case. It is sectional drawing which showed a thermo actuator and its peripheral part, Comprising: The case where a 2nd case is removed in the state which the rod extended | stretched from the 2nd case is shown.

Explanation of symbols

100 Exhaust Heat Recovery Unit 103 Valve 113 Cooling Water Introducing Pipe 201 Valve Shaft (Power Transmission Mechanism)
213 Rod 213a Pressing part 213b Gutter part 213c Tip end part of rod 214 Shaft lever (power transmission mechanism)
215 Thermo actuator 218 First case 218c First opening 219 Second case 219a Second opening 219e First case member 219f Second case member 219d, 219g Rod through hole 221 Thermal expansion body 224 Output piston Part (output part)
224a The tip of the output piston (the tip of the output)
228 Coil spring (pressing member)
230 Rubber seal 300 Bracket 400 Holding member

Claims (3)

A thermoactuator that expands and contracts the output section by expanding and contracting the thermal expansion body under the influence of the heat medium circulating in the exhaust heat recovery device body;
A rod provided to interlock with the expansion and contraction operation of the output unit;
A power transmission mechanism that operates a valve that is pressed by the tip of the rod and is provided in the exhaust heat recovery device body;
A first case for accommodating the thermoactuator, which forms a cylindrical body and is provided with a first opening on one side of which the thermoactuator can be taken in and out;
A second case having a second opening formed on one side of the rod, the second opening capable of inserting and removing the rod;
The first and second cases are exhaust heat recovery devices having a valve opening / closing device, which are detachably fixed to each other with the first opening and the second opening being overlapped. There,
One end of the first case where the first opening is provided is fixed to the exhaust heat recovery device main body via a bracket, while the first opening is provided. The exhaust heat recovery device according to claim 1, wherein the other end portion side of the exhaust heat recovery device is fixed to the exhaust heat recovery device body through a heat medium introduction pipe. The exhaust heat recovery device according to claim 1,
The second case includes a first case member provided with the second opening, and a second case member attached to the other end of the first case member,
A rod through hole is formed on the other end surface of each of the first and second case members,
A rubber seal having an annular shape is attached to the rod through hole on the first case member side, and a holding member having an annular shape is attached to the rod through hole on the second case member side,
The exhaust heat recovery device, wherein the rod is slidably held by the rubber seal and the holding member. The exhaust heat recovery device according to claim 2,
On the distal side of the proximal end portion of the rod, a collar portion extending in the circumferential direction is formed,
The exhaust heat recovery device according to claim 1, wherein the rod is supported by the contact between the flange portion of the rod and the first case member, and the rubber seal and the holding member.

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