JP5077061B2 - Waste heat recovery unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust heat recovery device can suppress closing of a condensation side connection part to stop reflux of working fluid. <P>SOLUTION: An evaporation part 1 includes a connection flow passage 30 with which a chip part 720 of the condensation side connection part 72 is connected and which guides working fluid within the condensation side connection part 72 to inside of the evaporation part 1. The working fluid within the condensation side connection part 72 is made to flow into the connection flow passage 30 via a chip opening part 721 formed on the chip part 720. The chip opening part 721 is provided with an inflow assist part for partially assisting inflow of the working fluid from inside of the condensation side connection part 72 to the connection flow passage 30. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an exhaust heat recovery device used for a vehicle such as an automobile.

  2. Description of the Related Art In recent years, there has been known an exhaust heat recovery device that recovers exhaust heat of exhaust gas from an exhaust system of a vehicle engine using the principle of a heat pipe and uses the exhaust heat for promoting warm-up.

  In such an exhaust heat recovery device, a heat pipe evaporating part is provided in the exhaust pipe of the engine, and a heat pipe condensing part is provided in the engine cooling water path so that the cooling water is cooled by the exhaust heat of the exhaust gas. Is heated (see, for example, Patent Document 1).

  By the way, as a heat exchanger using the principle of a heat pipe, there is a loop heat pipe type heat exchanger. This includes a closed circulation path that forms a closed loop, a working fluid enclosed in the circulation path that can be evaporated and condensed, and an evaporation unit that is disposed in the circulation path and evaporates the working fluid by heat input from the outside. And a condensing unit that exchanges heat between the heat transfer fluid evaporated in the evaporation unit and the heat transfer fluid from the outside.

Moreover, in order to make it a simple and compact structure that is advantageous for mounting on a vehicle, an exhaust heat recovery unit in which an evaporation unit and a condensation unit are integrated has been proposed (see, for example, Patent Document 2). This is because the evaporating part and the condensing part having a plurality of heat pipes are arranged adjacent to each other in the horizontal direction, and the operation side condensed by the condensing part and the evaporating side connecting part for guiding the working fluid evaporated in the evaporating part to the condensing part And a condensing side connecting part for guiding the fluid to the evaporating part.
Japanese Patent Laid-Open No. 62-268722 JP 2007-218556 A

  However, in the exhaust heat recovery device described in Patent Document 2, when water is used as the working fluid, the water is frozen in the condensing side connecting portion and the working fluid passage is blocked in a low temperature environment such as below freezing point. Therefore, there is a problem that the operation of the exhaust heat recovery device stops.

  In contrast, as shown in FIG. 9, the present inventors set the end of the condensation side connecting portion J72 on the evaporation portion J1 side to the water surface position of the working fluid in the heat pipe J3a of the evaporation portion J1 when the engine is stopped. It was considered to connect to the upper side of H. According to this, when the engine is stopped, that is, when the operation of the exhaust heat recovery device is stopped, the working fluid is frozen in the condensing side connecting portion J72 because there is no working fluid in the condensing side connecting portion J72. Can be prevented.

  However, in such a configuration, when the working fluid boils in the heat pipe J30 to which the condensing side connecting part J72 in the evaporation part J1 is connected, and the vapor of the working fluid reaches the condensing side connecting part J72, the condensing side connecting part. The condensing side connecting portion J72 is blocked by the surface tension of the working fluid at the leading end portion J720 of J72. In other words, the liquid of the working fluid is blocked in the condensing side connecting portion J72 by the vapor. As a result, there is a problem that the return of the working fluid is stopped and the exhaust heat recovery performance is deteriorated.

  An object of this invention is to provide the waste heat recovery device which can suppress that the condensing side connection part is obstruct | occluded and the recirculation | reflux of a working fluid stops in view of the said point.

To achieve the above object, according to the invention of claim 1, the condensation side connecting portion (72) arranged in the horizontal direction, the evaporation unit (1), the evaporation condensation side connecting portion (72) of the working fluid Having a connection channel (30) leading into the part (1), the inner wall surface of the connection channel (30) being arranged in the vertical direction,
The tip end portion (720) of the condensing side connecting portion (72) is inserted into the connection channel (30), and the tip end opening (721) formed in the tip end portion (720) is inserted into the connection channel (30). Via which the working fluid in the condensing side connecting portion (72) flows.
The tip opening (721) is provided with an inflow assisting portion that partially assists the inflow of the working fluid from the condensation side coupling portion (72) into the connection flow path (30) .
A part of the opening end surface of the tip opening (721) is close to or in contact with the inner wall facing the tip opening (721) of the condensing side coupling portion (72) among the inner walls in the vertical direction of the connection channel (30). Thus, the inflow assisting portion is configured .

According to this, even if the liquid of the working fluid in the condensation side coupling part (72) is about to be blocked by the vapor of the connection flow path (30), the tip opening (721) of the condensation side coupling part (72 ). a portion of the opening end surface connecting channel (30) that is close or in contact with the inner wall surface of, that of easy contact with the inner wall surface of the liquid working fluid partially connecting channel (30). Moreover, since the inner wall surface of the connection channel (30) is arranged in the vertical direction, the liquid of the working fluid can be smoothly moved downward along the inner wall surface . Thus, Ru can be introduced smoothly condensation side connecting portion of the liquid of the working fluid (72) to the connecting channel (30). As a result, the phenomenon that the liquid of the working fluid is dammed in the condensing side connection part (72) is suppressed. Therefore, it is possible to prevent the condensation-side connecting portion (72) from being closed and the working fluid from being recirculated.

Further, in the invention according to claim 2, previously end opening an open end face of (721), the inclined tapered surface relative to the direction of flow of the working fluid of the condensation side connecting portion (72) within and to Turkey It is characterized by.

  Thus, by making the opening end surface of the tip opening portion (721) a tapered surface, the opening area of the tip opening portion (721) of the condensation side connection portion (72) is changed to the tip portion of the condensation side connection portion (72). It can be made larger than the cross-sectional area of the flow path except for (720). As a result, the surface tension of the working fluid at the tip opening (721) of the condensing side coupling part (72) can be reduced, so that the working fluid boils in the connection flow path (30), and the working fluid vapors. When the tip end portion (720) of the condensing side connecting portion (72) is reached, the condensing side connecting portion (72) can be prevented from being blocked by the surface tension of the working fluid. Therefore, it is possible to prevent the condensation-side connecting portion (72) from being closed and the working fluid from being recirculated.

Moreover, in invention of Claim 3 , the surface (300) which opposes a front-end | tip opening part (721) among the inner wall surfaces of a connection flow path (30), and a front-end opening part (72) among condensing side connection parts (72). 721) A groove is provided on at least one of the adjacent surfaces (726).

  According to this, since the wettability of the inner wall surface in which the groove portion is formed can be increased, the working fluid can easily flow from the condensing side coupling portion (72) to the connection flow path (30). Therefore, it is possible to prevent the condensation-side connecting portion (72) from being closed and the working fluid from being recirculated.

In the invention according to claim 4 , the surface (300) facing the tip opening (721) of the inner wall surface of the connection channel (30) is subjected to a roughening treatment for roughening the surface (300). It is characterized by being.

  According to this, the wettability of the surface (300) facing the tip opening (721) in the inner wall surface of the connection channel (30) can be made larger than that of the other surface, so that the condensation side connecting portion (72 ) To the connection flow path (30). Therefore, it is possible to prevent the condensation-side connecting portion (72) from being closed and the working fluid from being recirculated.

Further, in the invention according to claim 5 , a roughening process for roughening the surface (726) is performed on the surface (726) in the vicinity of the tip opening (721) of the inner wall surface of the condensing side connection portion (72). It is characterized by being.

  According to this, since the wettability of the surface (726) in the vicinity of the tip opening (721) in the inner wall surface of the condensation side coupling portion (72) can be made larger than the other surfaces, the condensation side coupling portion (72 ) To the connection flow path (30). Therefore, it is possible to prevent the condensation-side connecting portion (72) from being closed and the working fluid from being recirculated.

Further, in the invention described in claim 6, it is characterized in that the groove on the inner wall surface of the above end (720) (73) is provided.

  According to this, since the wettability of the tip end portion (720) of the condensation side connection portion (72) can be increased, the working fluid easily flows from the condensation side connection portion (72) to the connection flow path (30). . Therefore, it is possible to prevent the condensation-side connecting portion (72) from being closed and the working fluid from being recirculated.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. The exhaust heat recovery device of this embodiment recovers exhaust heat of exhaust gas from an exhaust system of a vehicle engine (internal combustion engine) and uses the exhaust heat for promoting warm-up.

  FIG. 1 is a schematic cross-sectional view showing an exhaust heat recovery device according to the first embodiment. As shown in FIG. 1, the exhaust heat recovery device of the present embodiment includes an evaporator 1 and a condenser 2. The evaporation unit 1 is provided in an exhaust passage (not shown) through which the exhaust gas of the engine flows. Further, the evaporating unit 1 performs heat exchange between the exhaust gas and a working fluid described later to evaporate the working fluid. The exhaust gas corresponds to the heating fluid of the present invention.

  The condensing unit 2 is provided outside the exhaust passage, and is provided in a housing 20 that is disposed in a cooling water path of an engine (not shown). Further, the condensing unit 2 performs heat exchange between the working fluid evaporated in the evaporating unit 1 and the engine cooling water to condense the working fluid. The cooling water corresponds to the heated fluid of the present invention.

  Next, the configuration of the evaporation unit 1 will be described.

  The evaporation unit 1 includes a plurality of evaporation side heat pipes 3a and corrugated fins 4a joined to the outer surface of the evaporation side heat pipe 3a. The evaporation side heat pipes 3a are formed in a flat shape so that the exhaust gas flow direction (perpendicular to the plane of FIG. 1) coincides with the major axis direction, and a plurality of the evaporation side heat pipes 3a are parallel so that the longitudinal direction thereof coincides with the vertical direction. Is arranged.

  In the evaporating section 1, both ends of the evaporation side heat pipe 3a in the longitudinal direction (hereinafter referred to as the evaporation side heat pipe longitudinal direction) are arranged in the stacking direction of the evaporation side heat pipe 3a (hereinafter referred to as the evaporation side heat pipe stacking direction). Evaporation side headers 5a that extend and communicate with all the evaporation side heat pipes 3a are respectively provided. Here, of the evaporation side header 5a, the evaporation side header 5a disposed on the upper end side of the evaporation side heat pipe 3a is referred to as a first evaporation side header 51a, and the evaporation side disposed on the lower end side of the evaporation side heat pipe 3a. The header 5a is referred to as a second evaporation side header 52a.

  Moreover, the evaporation part 1 has the connection flow path 30 for connecting the 2nd evaporation side header 52a and the condensation side connection part 72 mentioned later. The connection flow path 30 extends substantially parallel to the evaporation side heat pipe 3a, and is arranged side by side with the plurality of evaporation side heat pipes 3a in the horizontal direction, that is, the evaporation side heat pipe stacking direction.

  Next, the configuration of the condensing unit 2 will be described.

  The condensing unit 2 includes a plurality of condensing side heat pipes 3b and corrugated fins 4b joined to the outer surface of the condensing side heat pipe 3b. The condensation side heat pipes 3b are formed in a flat shape so that the exhaust gas flow direction coincides with the major axis direction, and a plurality of the condensation side heat pipes 3b are arranged in parallel so that the longitudinal direction thereof coincides with the vertical direction.

  In the condensing unit 2, condensing side headers 5 b that extend in the stacking direction of the condensing side heat pipes 3 b and communicate with all the condensing side heat pipes 3 b are provided at both ends in the longitudinal direction of the condensing side heat pipes 3 b. . Here, the condensation side header 5b arrange | positioned among the condensation side headers 5b at the upper end side of the condensation side heat pipe 3b is called the 1st condensation side header 51b, and the condensation side arrange | positioned at the lower end side of the condensation side heat pipe 3b. The header 5b is referred to as a second condensing side header 52b.

  A valve mechanism 6 is disposed in the second condensing side header 52b. The valve mechanism 6 forms a flow path connecting the condensation side heat pipe 3b and the second evaporation side header 52a, and opens and closes the flow path according to the internal pressure (pressure of the working fluid) of the evaporation side heat pipe 3a. It is a diaphragm type opening and closing means. Specifically, the valve mechanism 6 closes when the internal pressure rises at a predetermined working fluid temperature and exceeds the first predetermined pressure from the normal valve opening state, and conversely, the internal pressure decreases and the first predetermined pressure decreases. When the pressure falls below a second predetermined pressure lower than the pressure, the valve is opened again.

  Further, the evaporation side header 5a and the condensation side header 5b are connected to each other through a cylindrical connecting portion 7. A closed loop is formed by the evaporation side, the condensation side heat pipes 3a and 3b, the evaporation side, the condensation side headers 5a and 5b, and the connecting portion 7, and a working fluid capable of evaporating and condensing water, alcohol, etc. Is enclosed. As a result, the working fluid circulates through the evaporator 1 and the condenser 2.

  Here, of the two connecting parts 7, disposed on the upper side, connecting the first evaporation side header 51 a and the first condensation side header 51 b, and guiding the working fluid evaporated in the evaporation part 1 to the condensation part 2 Is called the evaporation side connecting portion 71. Moreover, it arrange | positions among two connection parts 7 below, connects the 2nd evaporation side header 52a and the 2nd condensation side header 52b, and guides the working fluid condensed by the condensation part 2 to the evaporation part 1 Is called the condensing side connecting portion 72.

  The second condensing side header 52b is arranged to be above the second evaporating side header 52a when the exhaust heat recovery device is mounted on a horizontal vehicle. Moreover, the evaporation side connection part 71 and the condensation side connection part 72 are mutually arrange | positioned in parallel. The end of the condensing side connecting part 72 on the side close to the evaporation part 1 is connected to the connection channel 30.

  Here, the detailed structure of the evaporation part 1 of this embodiment is demonstrated based on FIG. 2 and FIG.

  FIG. 2 is an exploded perspective view showing the evaporation unit 1 in the first embodiment, and FIG. 3 is an enlarged front view showing the passage unit 11 in the first embodiment. As shown in FIGS. 2 and 3, the evaporation unit 1 is configured by stacking a plurality of passage units 11 through which exhaust gas passes. The passage unit 11 has a substantially U-shaped cross section, and includes first and second plates 121 and 122 that are fitted to face each other.

  More specifically, the first and second plates 121 and 122 have bottom surfaces 121a and 122a having a surface substantially parallel to the exhaust gas flow direction and extending substantially parallel to the evaporation side heat pipe longitudinal direction, and a bottom surface 121a. , 122a have a pair of side surface portions 121b, 122b that protrude from both longitudinal ends of the evaporation side heat pipe in a direction substantially orthogonal to the bottom surface portions 121a, 122a and extend substantially parallel to the exhaust gas flow direction. . And the channel | path unit 11 is comprised by fitting the 1st, 2nd plates 121 and 122 facing each other so that the side parts 121b and 122b may overlap.

  Further, the central portions in the exhaust gas flow direction of the bottom surface portions 121a and 122a of the first and second plates 121 and 122 are bent portions 121c and 122c that are bent so that the inner surface side of the passage unit 11 is convex. The bent portions 121c and 122c are continuously formed over the entire area of the bottom surface portions 121a and 122a in the longitudinal direction of the evaporation side heat pipe.

  As shown in FIG. 3, the end portion of the side surface portion 122 b of the second plate 122 far from the bottom surface portion 122 a has substantially the same height as the thickness of the first plate 121, and is on the inner side of the passage unit 2. A stepped portion 122f having a stepped portion 122d that is bent into one end and a receiving portion 122e that has one end connected to the stepped portion 122d and extends substantially parallel to the side surface portion 121b of the first plate 121 is formed. Then, by fitting the first plate 121 so as to be outside the second plate 122, the end portion of the side surface portion 121b of the first plate 121 far from the bottom surface portion 121a is in contact with the stepped-down portion 122d, The inner surface of the passage unit 11 in the side surface portion 121b of the first plate 121 is in contact with the outer surface of the passage unit 11 in the receiving portion 122e.

  An end portion of the side surface portion 121b of the first plate 121 far from the bottom surface portion 121a (hereinafter referred to as a front end portion 121d) has a tapered shape that is inclined in a direction away from the receiving portion 122e as the distance from the bottom surface portion 121a increases. For this reason, of the outer side surfaces of the passage unit 11, the surface orthogonal to the longitudinal direction of the evaporation side heat pipe, that is, the outer side surface of the passage unit 11, the side surfaces 121 b and 122 b of the plates 121 and 122 The configured surface is a flat surface without a groove or the like.

  In the present embodiment, the outer surface of the passage unit 11 in the stepped-down portion 122d is tapered so as to correspond to the tip portion 121d of the side surface portion 121b. For this reason, when the first and second plates 121 and 122 are fitted together, the stepped-down portion 122e and the front end portion 121d of the side surface portion 121b come into contact with each other without a gap.

  Further, in the bent portions 121g, 122g between the bottom surface portions 121a, 122a and the side surface portions 121b, 122b in the first and second plates 121, 122, the outer surface of the passage unit 11 of the bottom surface portions 121a, 122a The angle formed between the side surfaces 121b and 122b and the outer surface of the passage unit 11 is substantially a right angle.

  The corrugated fin 4 a is disposed inside each passage unit 11 and is sandwiched between the bent portions 121 c and 122 c of the first and second plates 121 and 122. That is, the corrugated fin 4a is held between the bent portions 121c and 122c of the plates 121 and 122.

  Then, as shown in FIG. 2 and FIG. 3, a plurality of the above-described passage units 11 are laminated so that the portions excluding the bent portions 121 c and 122 c of the bottom surface portions 121 a and 122 a of the plates 121 and 122 are in contact with each other. The core part 14 is configured. At this time, the evaporation side heat pipe 3a, which is a passage through which the working fluid flows, is configured in a portion where the bent portions 121c and 122c between the adjacent passage units 11 face each other. In the present embodiment, the ribs 121h that protrude outward from the passage unit 11 are disposed in the bent portions 121c and 122c. When a plurality of the passage units 11 are stacked, the ribs between the adjacent passage units 11 are disposed. 121h are in contact with each other.

  Further, as shown in FIG. 2, both end portions of the core portion 14 in the longitudinal direction of the evaporation side heat pipe are surfaces orthogonal to the longitudinal direction of the evaporation side heat pipe, that is, side portions of the first and second plates 121 and 122. A tank main body 13 that constitutes a space in the tank is assembled together with 121b and 122b, thereby forming an evaporation side header 5a. The tank body 13 has a three-dimensional shape in which the inside is a space and one side is open, and a space forming portion 131 in which the inside and all the evaporation side heat pipes 3a communicate with each other through the opening, And a flange portion 132 formed at the peripheral edge of the opening of the portion 131.

  The flange portion 132 is configured to contact the surface perpendicular to the evaporation side heat pipe longitudinal direction of the core portion 14, that is, the side surface portions 121 b and 122 b of the first and second plates 121 and 122 without any gap. In the present embodiment, the flange portion 132 extends in the exhaust gas flow direction so that the end portion in the exhaust gas flow direction corresponds to the end portion in the exhaust gas flow direction of the core portion 14.

  Claw portions 133 for locking the tank body 13 to the core portion 14 are provided at both ends of the flange portion 132 in the stacking direction of the passage units 11 (hereinafter referred to as the passage unit stacking direction). The claw portion 133 serves as a self jig that presses the core portion 14 from the passage unit stacking direction when the tank body 13 is assembled to the core portion 14.

  The space forming part 131 of the tank body 13 assembled on the upper side of the core part 14 is formed with an evaporation side through hole 134a to which the evaporation side connecting part 71 is connected.

  Of the claw parts 133 of the tank body 13 assembled on the lower side of the core part 14, the first claw part 133 a arranged on the side close to the condenser part 2 is the second claw part arranged on the side far from the condenser part 2. It extends upward from 133b. And the connection flow path 30 is comprised by the 1st nail | claw part 133a and the bending part 121c of the 1st plate which opposes this 1st nail | claw part 133a. And the condensation side through-hole 134b to which the condensation side connection part 72 is connected is formed in the upper side edge part of the 1st nail | claw part 133a.

  Moreover, the cylindrical duct part 15 which the both ends open which comprises the duct which exhaust gas passes is assembled | attached to the both ends of the exhaust gas flow direction in the core part 14. As shown in FIG. The duct portion 15 is provided with a locking portion 151 that protrudes toward the core portion 14 and for locking the duct portion 15 to the core portion 14.

  The locking portion 151 serves as a self jig for pressing the core portion 14 and the flange portion 132 of the tank body 13 from the longitudinal direction of the evaporation side heat pipe when the duct portion 15 is assembled to the core portion 14. In the present embodiment, the locking portion 151 is configured as a cylindrical member having a larger diameter than the duct portion 15 and is integrally formed with the duct portion 15. And when the duct part 15 is assembled | attached to the core part 14, the latching | locking part 151 presses the flange part 132 of the tank main body 13 over the whole channel unit lamination direction.

  FIG. 4 is an enlarged view of part A in FIG. As shown in FIGS. 1 and 4, the end portion of the condensing side coupling portion 72 near the evaporation portion 1 (hereinafter referred to as a tip portion 720) is connected to the connection flow path 30. A distal end opening 721 is formed at the distal end 720, and the working fluid flows into the connection channel 30 from the condensation side coupling portion 72 via the distal end opening 721.

  More specifically, a cylindrical burring part 134c that protrudes toward the condensing part 2 is formed at the inner peripheral edge of the condensing side through hole 134b. The tip 720 of the condensing side connecting portion 72 is joined to the inner wall surface of the burring portion 134c while being inserted into the condensing side through hole 134c. Further, the condensing side connecting portion 72 is formed with a bulging portion 725 that bulges outward. The bulging part 725 interferes with the end part of the burring part 134c on the condensing part 2 side when the tip part 720 is inserted into the condensing side through hole 134c. Can be positioned.

  Further, the opening end surface of the front end opening 721 of the condensing side connecting portion 72 is tapered with respect to the working fluid flow direction of the condensing side connecting portion 72. That is, the normal line of the end surface of the tip end portion 720 is not parallel to the working fluid flow direction of the condensing side connection portion 72. Further, the tip end portion 720 is formed so that the cross-sectional area of the flow path becomes smaller as it approaches the evaporation portion 1. In the present embodiment, the opening end surface of the tip opening 721 is inclined so that the upper part is closer to the evaporation part 1 than the lower part.

  Therefore, the opening area of the front end opening 721 of the condensing side connection part 72 is larger than the flow path cross-sectional area of the other part of the condensing side connection part 72, that is, the part excluding the front end opening 721. The channel cross-sectional area refers to the area of a cross section perpendicular to the working fluid flow direction of the condensing side connecting portion 72. In the present embodiment, the working fluid flow direction of the condensing side connecting portion 72 coincides with the longitudinal direction of the condensing side connecting portion 72.

  Further, the tip end portion 720 of the condensing side connecting portion 72 is in partial contact with the inner wall surface of the connection channel 30. In the present embodiment, the distal end portion 720 is in contact with the inner wall surface of the connection flow path 30 at the upper end portion thereof, that is, the portion that is disposed closest to the evaporation portion 1 side. The opening end surface of the front end portion 720 is formed in an inclined taper shape with respect to the tube so as to provide an opening area larger than the circular cross section as the tube of the condensing side connection portion 72. This tapered opening end surface provides an inflow assisting portion.

  The tapered opening end face is positioned so that the opening end face is directed downward in the direction of gravity in the installed state of the exhaust heat recovery device. The opening end face directed downwards assists the liquid outflow starting from the lower part of the opening edge. The distal end portion 720 is disposed so as to be close to and further in contact with the inner wall surface of the connection flow path 30, particularly the wall surface facing the opening direction of the condensing side coupling portion 72. As a result, the opening end face is disposed close to the inner wall surface of the connection channel 30. The arrangement in which the opening end surface of the condensing side connecting portion 72 is close to the wall surface also provides an inflow assisting portion. The opening end face that is close to or in contact with the opening assists the liquid outflowing from the site.

  Further, an inflow assisting portion that assists inflow from the condensing connection portion 72 is also formed on the connection flow path 30 side. The inflow assisting portion on the side of the connection channel 30 enhances the wettability of the liquid on the inner wall surface, for example. As a result, the liquid that has come into contact with the inner wall surface from the condensation connecting portion 72 is easily drawn out to the inner wall surface. The inflow assisting portion on the connection flow path 30 side is provided by a rough surface 300 provided on the inner wall surface, for example.

  Specifically, of the inner wall surface of the connection channel 30, the surface facing the tip opening 721 is subjected to a roughening process that roughens the surface, resulting in a rough surface 300 with a rough surface. For this reason, the surface roughness of the rough surface 300 is greater than that of other surfaces on the inner wall surface of the connection flow path 30. Similarly, the surface in the vicinity of the tip portion 720 of the inner wall surface of the condensing side connecting portion 72 is subjected to a roughening process to roughen the surface thereof, thereby forming a rough surface 726 with a rough surface. For this reason, the rough surface 726 has a higher surface roughness than the other surfaces of the inner wall surface of the condensing side connecting portion 72. Examples of such surface roughening treatment include physical roughening treatment by sandblasting, chemical roughening treatment by generally known chemical etching, and the like.

  As described above, the tip end of the condensing side connecting portion 72 is tapered by making the opening end surface of the leading end opening portion 721 of the condensing side connecting portion 72 inclined with respect to the working fluid flow direction of the condensing side connecting portion 72. The opening area of the opening 721 can be made larger than the cross-sectional area of the flow path at the other part of the condensing side connecting portion 72. As a result, the surface tension of the working fluid at the tip opening 721 of the condensing side connecting portion 72 can be reduced, so that the working fluid boils in the connection channel 30 and the vapor of the working fluid flows into the condensing side connecting portion 72. When the tip portion 720 is reached, it is possible to suppress the condensing side connection portion 72 from being blocked by the surface tension of the working fluid. Therefore, it is possible to prevent the condensing side connecting portion 72 from being closed and the return of the working fluid from stopping.

  Furthermore, the working fluid flowing in from the condensing side coupling part 72 is transmitted along the inner wall surface of the connection channel 30 by causing the tip 720 of the condensation side coupling unit 72 to partially contact the inner wall surface of the connection channel 30. It can be made to flow. As a result, the working fluid easily flows from the condensing side connecting portion 72 to the connection flow path 30, so that the condensing side connecting portion 72 is blocked and the working fluid is prevented from returning.

  Further, the surface facing the tip opening 721 of the condensing side connecting portion 72 in the inner wall surface of the connection channel 30 is a rough surface 300, and the surface in the vicinity of the tip portion 720 is in the inner wall surface of the condensing side connecting portion 72. By setting it as the rough surface 726, the wettability of the rough surfaces 300 and 726 can be made larger than that of other surfaces, so that the working fluid can easily flow from the condensing side connecting portion 72 to the connection flow path 30. Therefore, it is possible to further suppress the condensing side connecting portion 72 from being closed and the return of the working fluid from stopping.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is an enlarged cross-sectional view showing the vicinity of the tip portion 720 of the condensing side connection portion 72 in the second embodiment.

  As shown in FIG. 5, the end surface of the tip portion 720 is inclined such that the lower portion is closer to the evaporation portion 1 than the upper portion. And the front-end | tip part 720 is contacting the inner wall surface of the connection flow path 30 in the downward side edge part, ie, the site | part arrange | positioned most at the evaporation part 1 side.

  As a result, the surface tension of the working fluid at the tip opening 721 of the condensing side connecting portion 72 can be reduced, so that the working fluid boils in the connection channel 30 and the vapor of the working fluid flows into the condensing side connecting portion 72. When the tip portion 720 is reached, it is possible to suppress the condensing side connection portion 72 from being blocked by the surface tension of the working fluid. Therefore, it is possible to prevent the condensing side connecting portion 72 from being closed and the return of the working fluid from stopping.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is an enlarged cross-sectional view showing the vicinity of the tip portion 720 of the condensing side connecting portion 72 in the third embodiment.

  As shown in FIG. 6, the lower end portion 722 of the tip end portion 720 of the condensing side connecting portion 72 is a tapered surface that is inclined in a direction toward the lower side as the evaporation portion 1 is approached. Thereby, since the working fluid in the condensation side connection part 72 can be made to flow easily by the connection flow path 30 side, it can suppress more that the condensation side connection part 72 is obstruct | occluded and the recirculation | reflux of a working fluid stops.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is an enlarged cross-sectional view showing the vicinity of the tip portion 720 of the condensing side connecting portion 72 in the fourth embodiment.

  As shown in FIG. 7, the end surface of the front end portion 720 of the condensing side connecting portion 72 is bent so that the cross section viewed from the exhaust gas flow direction (perpendicular to the plane of FIG. 7) has a substantially U shape. . That is, the end surface of the front end portion 720 is connected to the upper end portion of the front end portion 720, and the first taper surface 723 is inclined in a direction toward the lower side as the distance from the evaporation unit 1 is increased. The second tapered surface 724 is connected to the lower end portion of the 720 and is inclined in the direction toward the upper side as the distance from the evaporation portion 1 increases.

  As a result, the surface tension of the working fluid at the tip opening 721 of the condensing side connecting portion 72 can be reduced, so that the working fluid boils in the connection channel 30 and the vapor of the working fluid flows into the condensing side connecting portion 72. When the tip portion 720 is reached, it is possible to suppress the condensing side connection portion 72 from being blocked by the surface tension of the working fluid. Therefore, it is possible to prevent the condensing side connecting portion 72 from being closed and the return of the working fluid from stopping.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 8A is an enlarged cross-sectional view showing the vicinity of the tip 720 of the condensing side connecting portion 72 in the fifth embodiment, and FIG. 8B is a cross-sectional view taken along line BB in FIG. 8A.

  As shown in FIG. 8A, the tip end portion 720 of the condensing side connecting portion 72 of the present embodiment is not in contact with the inner wall surface of the connection channel 30. Further, the end surface of the front end portion 720 is orthogonal to the working fluid flow direction of the condensing side connecting portion 72 (perpendicular to the plane of FIG. 8B).

  As shown in FIG. 8B, a plurality of groove portions 73 extending substantially parallel to the working fluid flow direction of the condensation side connection portion 72 are formed on the inner wall surface in the vicinity of the tip portion 720 of the condensation side connection portion 72. The plurality of groove portions 73 are arranged over the entire inner circumference of the condensation side connecting portion 72.

  According to this, since the wettability of the front end portion 720 of the condensation side connection portion 72 can be increased, the working fluid can easily flow from the condensation side connection portion 72 to the connection flow path 30. Therefore, it is possible to prevent the condensing side connecting portion 72 from being closed and the return of the working fluid from stopping.

(Other embodiments)
The inflow assisting portions employed in the plurality of embodiments described above can be used alone or in combination.

  In the first to fourth embodiments, the front surface portion 720 of the inner wall surface of the connection flow path 30 that faces the front end opening 721 of the condensation side connection portion 72 and the inner wall surface of the condensation side connection portion 72. Although an example in which the surface in the vicinity is a rough surface having a surface roughness higher than that of other surfaces has been described, the present invention is not limited to this, and a groove portion may be provided instead of providing a rough surface.

  In the first to fourth embodiments, the front surface portion 720 of the inner wall surface of the connection channel 30 that faces the front end opening 721 of the condensing side connection portion 72 and the inner wall surface of the condensing side connection portion 72. Although an example in which both of the nearby surfaces are rough surfaces has been described, only one of the surfaces may be rough surfaces. Moreover, you may provide a groove part only in any one surface.

It is a schematic sectional drawing which shows the waste heat recovery device which concerns on 1st Embodiment. It is a disassembled perspective view which shows the evaporation part 1 in 1st Embodiment. It is an enlarged front view which shows the channel | path unit 11 in 1st Embodiment. It is the A section enlarged view of FIG. It is an expanded sectional view which shows the front-end | tip part 720 vicinity of the condensation side connection part 72 in 2nd Embodiment. It is an expanded sectional view showing the tip part 720 neighborhood of condensation side connection part 72 in a 3rd embodiment. It is an expanded sectional view showing the tip part 720 neighborhood of condensation side connection part 72 in a 4th embodiment. (A) is an expanded sectional view which shows the front-end | tip part 720 vicinity of the condensation side connection part 72 in 5th Embodiment, (b) is BB sectional drawing of Fig.8 (a). It is a schematic sectional drawing which shows the conventional waste heat recovery device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Evaporation part 2 Condensing part 30 Connection flow path 71 Evaporation side connection part 72 Condensation side connection part 73 Groove part 720 Tip part 721 Tip opening part

Claims (6)

An evaporating section (1) for exchanging heat between the heating fluid and an evaporating and condensing working fluid enclosed therein, and evaporating the working fluid;
A condenser (2) for exchanging heat between the working fluid evaporated in the evaporator (1) and the fluid to be heated to condense the working fluid;
An evaporation side connecting portion (71) for guiding the working fluid evaporated in the evaporation portion (1) to the condensing portion (2);
A waste heat recovery device comprising a condensing side connecting part (72) for guiding the working fluid condensed in the condensing part (2) to the evaporation part (1),
The condensing side connection part (72) is arranged in a horizontal direction,
The evaporation portion (1) is pre-Symbol condensation side connecting part the working fluid in (72) has a connecting channel (30) leading to the evaporating section (1) within
The inner wall surface of the connection channel (30) is arranged in the vertical direction,
The tip end portion (720) of the condensation side connection portion (72) is inserted into the connection flow path (30),
The working fluid in the condensing side connection part (72) flows into the connection flow path (30) through a tip opening part (721) formed in the tip part (720). ,
The tip opening (721) is provided with an inflow assisting portion that partially assists inflow of the working fluid from the condensation side coupling portion (72) into the connection flow path (30) ,
A part of the opening end surface of the tip opening (721) on the inner wall facing the tip opening (721) of the condensing side connecting portion (72) among the inner walls in the vertical direction of the connection channel (30). The exhaust heat recovery device is characterized in that the inflow assisting portion is configured by adjoining or contacting . Wherein prior Symbol distal opening an open end face of (721), in claim 1, wherein the inclined tapered surface to Turkey the flow direction of the working fluid of the condensation side connecting portion (72) in Waste heat recovery unit. Of the inner wall surface of the connection channel (30), the surface (300) facing the tip opening (721) and the surface near the tip opening (721) (726) of the condensing side connecting portion (72). ) Is provided with a groove portion, at least one of the exhaust heat recovery device according to claim 1 or 2 . The surface (300) facing the tip opening (721) of the inner wall surface of the connection channel (30) is subjected to a roughening treatment for roughening the surface (300). Item 4. The exhaust heat recovery device according to any one of Items 1 to 3 . The surface (726) in the vicinity of the tip opening (721) of the inner wall surface of the condensing side connecting portion (72) is subjected to a roughening process for roughening the surface (726). Item 5. The exhaust heat recovery device according to any one of Items 1 to 4 . Exhaust heat recovery device according to any one of claims 1 to 5, characterized in that the groove on the inner wall surface of the front Symbol tip (720) (73) is provided.

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