JP2015138790A - Thermoelectric conversion power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress damage on a thermoelectric conversion element effectively by reducing a stress applied to the thermoelectric conversion element, while holding enhancement of power generation efficiency by a fin in a tube body.SOLUTION: In a power generator generating power by providing a cooling jacket 3 on the outer surface side of a tube body 25, sandwiching a thermoelectric conversion module 4 between a pair of main plates 251 of the tube body 25 and the cooling jacket 3, and giving a temperature difference to the thermoelectric conversion module 4 by the tube body 25 heated by heating fluid H and the cooling jacket 3, a heat collection fin 7 disposed in the conduit 253 in the tube body 25 is divided into a fin coming into contact with the main plate 251 on one side, and a fin coming into contact with the main plate 251 on the other side, which are not bonded to each other. The main plate 251 is made to deform easily by suppressing increase in the rigidity of the main plate 251 at the fin 7 to be bonded, and a thermoelectric conversion element 41 of the thermoelectric conversion module 4 is made less likely to be damaged.

Description

  The present invention relates to a thermoelectric power generation apparatus that converts a thermal energy into an electrical energy by giving a temperature difference to a thermoelectric conversion module.

  A power generation technique for converting thermal energy into electrical energy using a thermoelectric conversion element is known. The thermoelectric conversion element uses a Seebeck effect that causes a potential difference between a high temperature part and a low temperature part by giving a temperature difference to a separated part, and the power generation amount increases as the temperature difference increases. Such a thermoelectric conversion element is used in the form of a thermoelectric conversion element module in which a plurality are joined by electrodes. For example, by laminating a thermoelectric conversion module and a cooling part on the outer surface of the pipe body and introducing a heating fluid into the pipe body, the space between the heated pipe body (high temperature part) and the cooling part (low temperature part) 2. Description of the Related Art A thermoelectric conversion power generator having a configuration in which electricity is extracted by causing a temperature difference in a thermoelectric conversion module sandwiched between two is known (Patent Document 1).

JP 2006-217756 A

  In the thermoelectric conversion power generation device having the above configuration, the fin is joined to the inner surface of the tubular body, the heat of the heating fluid is collected by the fin and transferred to the tubular body, and the temperature of the high temperature part is further increased, Power generation efficiency is improved. By the way, the thermal stress by a thermal expansion difference arises in the thermoelectric conversion element of the thermoelectric conversion module to which a temperature difference is given by a high temperature part and a low temperature part. Since the thermoelectric conversion element is joined to the tubular body via the high temperature side electrode, the thermal stress generated in the thermoelectric conversion element is transmitted to the tubular body and tries to deform the tubular body. However, the tube body is hard to be deformed because the rigidity is increased by the fins being joined, and therefore, the thermoelectric conversion element receives stress from the tube body, and as a result, the thermoelectric conversion element In some cases, cracks or breakage occurred.

  The present invention has been made in view of the above circumstances, and the main problem is that thermoelectric conversion is achieved by reducing the stress applied to the thermoelectric conversion element while maintaining improvement in power generation efficiency by the fins arranged in the pipes in the pipe body. An object of the present invention is to provide a thermoelectric conversion power generation device that can effectively prevent damage to elements.

  The thermoelectric conversion power generation device of the present invention includes at least a pair of opposed heating plate portions, a tube body in which a pipe line through which a heating fluid flows is formed, and an outer surface side of the heating plate portion. A cooling unit, a thermoelectric conversion module having a thermoelectric conversion element disposed between the heating plate unit and the cooling unit, and disposed inside the tube and joined to the heating plate unit, and the heating In the thermoelectric conversion power generation apparatus, the fins that collect heat of the fluid and transmit the heat to the heating plate portion, and generate electricity by giving a temperature difference to the thermoelectric conversion module by the heating plate portion and the cooling portion. The fins are divided in a non-bonded state on one side and the other side of the pair of heating plate portions, and the divided fins open to the sides facing each other, and the pipe line In the direction that intersects the direction of With bets are formed at both ends in the direction orthogonal to the direction of at least the conduit, wherein the connecting portion is provided that does not divide the fin by the slit. The fin of this invention contains the form comprised with the corrugated board.

  In the present invention, the heating plate portion is heated by the heating fluid flowing through the pipe line in the pipe body, and the heat is transmitted to the inner surface side (pipe body side) of the thermoelectric conversion module and heated. On the other hand, the outer surface side of the thermoelectric conversion module is cooled by the cooling unit, thereby generating a temperature difference in the thermoelectric conversion module and generating power. The heat of the heating fluid flowing inside the tube is collected by the fins and transmitted to the pair of heating plate portions, and the heating plate portions are increased in temperature and the power generation efficiency is improved.

  The fin of this invention is divided | segmented into the one side and other side of a pair of heating plate part of a tubular body, and these divided | segmented fins are a non-joining state. For this reason, although the divided fins are joined to the pair of heating plate portions, the pair of heating plate portions are not integrally joined via these fins, and the heating plate portion is The restraint by the fins is reduced and the rigidity is suppressed from increasing. As a result, the heating plate portion tends to be deformed in a form that warps or distorts, particularly with respect to the direction intersecting the direction of the pipe line of the tube (the flow direction of the heating fluid). On the other hand, each of the divided fins is formed with a slit along the direction intersecting the direction of the pipe line, which also suppresses the increase in rigidity of the heating plate part, particularly in the direction of the pipe line. On the other hand, the deformation in the form of warping or distortion is likely to occur. In this case, if the heating plate part is deformed in a form of warping or distorting with respect to the direction of the pipeline, the fin is deformed following the heating plate part due to the slit becoming narrower or wider, Therefore, the heating plate portion is deformed without being restricted by the fins.

  As described above, the fin is divided into one side and the other side of the heating plate portion, and a slit is formed in these fins along the direction intersecting the direction of the pipe line of the tubular body, so that the heating plate portion Is restrained from increasing the rigidity even if the fins are joined, and is likely to be deformed in both the direction of the pipe line and the direction intersecting the pipe line, that is, in almost all directions. Deformation is possible. Therefore, the heating plate portion is deformed in accordance with the thermal stress applied to the thermoelectric conversion element, and the stress that the thermoelectric conversion element receives from the heating plate portion is reduced as compared with the conventional case. As a result, damage to the thermoelectric conversion element can be effectively suppressed. Note that it is preferable that a plurality of slits formed in the fins are formed at intervals in the direction of the pipe line so that the fins and the heating plate portion are easily deformed.

  Each of the divided fins is not divided by a connecting portion provided at both ends in a direction intersecting the direction of the pipe line, even if a slit is formed, and is configured as an integral one via the connecting portion. ing. For example, if the fins are divided by slits, it is difficult to attach the divided pieces in an aligned state along the pipeline direction while providing slits, but they are easily handled in an aligned state because they are integrated. Therefore, the work of assembling the fins into the tube body is facilitated. Also, if the fins are not aligned due to the division of the fins, the fin cross-sectional area will increase, and as a result, the effective cross-sectional area of the pipe will become narrower and the pressure loss of the heated fluid will increase. However, such a problem does not occur in the present invention.

  According to the present invention, it is possible to reduce the stress applied to the thermoelectric conversion element and effectively suppress the breakage of the thermoelectric conversion element while maintaining the improvement of the power generation efficiency by the fins disposed in the pipe line in the pipe body. There is an effect.

1 is an overall perspective view of a thermoelectric conversion power generator according to an embodiment of the present invention. It is an II directional arrow line view of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is a perspective view which shows the structure of the housing | casing of the airtight container with which the same electric power generating apparatus is provided. FIG. 5 is a partially enlarged view of FIG. 4, and is a cross-sectional view illustrating a configuration of a thermoelectric conversion module and fins. It is (a) perspective view which shows the shape of the fin of one Embodiment, (b) It is sectional drawing of a slit part. It is the (a) perspective view which shows the modification which changed the thickness of the connection part of the fin of one Embodiment, (b) It is sectional drawing of a slit part. It is (a) perspective view which shows the other modification which changed the position of the connection part of the fin of one Embodiment, (b) It is sectional drawing of a slit part. It is a figure explaining the example of a manufacturing method of the fin of FIG. 9, Comprising: It is a top view which shows the board | plate material of the raw material of a fin. It is the fin of the comparative example divided | segmented by the slit, Comprising: (a) The perspective view of a fin division body in the alignment state, (b) The perspective view of the state which the fin division body has shifted | deviated to the bending direction, (c) (b FIG. 4 is a front view showing a state where the fin divided body is displaced in the bending direction. It is a figure which shows the fin which concerns on other embodiment of this invention. It is a figure which shows the fin which concerns on other embodiment of this invention, Comprising: (a) The figure which shows the attachment state to the inside of a tubular body, (b) The figure which shows the corrugated board which is the raw material of a fin.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[1] Configuration of Thermoelectric Conversion Power Generation Device FIGS. 1 to 4 show a thermoelectric conversion power generation device (hereinafter referred to as a power generation device) 1 according to an embodiment. FIG. 1 is an overall perspective view, and FIG. II direction view, FIG. 3 and FIG. 4 are a III-III sectional view and an IV-IV sectional view of FIG. 2, respectively. This power generator 1 is formed in a flat rectangular parallelepiped shape (the X direction is the longitudinal direction in FIGS. 1, 3, and 4), and is housed in a water cooling jacket (cooling portion) 3 and the water cooling jacket 3. A sealed container 2 is provided.

  The sealed container 2 has a double tube structure in which a flat tubular tube 25 is housed in the center of the flat tubular housing 20, and the space between the housing 20 and the tubular body 25 is decompressed. The opening at both ends in the X direction of the decompression space 29 is hermetically closed by the sealing cover 26. The water-cooling jacket 3 is formed in a flat tubular shape substantially along the outer shape of the sealed container 2, and the sealed container 2 housed therein has both end portions on the opening side projecting from both end openings of the water-cooled jacket 3.

  As shown in FIG. 5, the housing 20 is composed of a rigid portion 21 as a main body and a rectangular thin plate 22 joined to the rigid portion 21. The rigid portion 21 includes a pair of frames having a rectangular outer frame plate portion 211 and an inner frame plate portion 212 that partitions the inside of the outer frame plate portion 211 into two rectangular holes 213 divided in the longitudinal direction (X direction). The plates 210 face each other in parallel in the vertical direction (Z direction), the edges along the longitudinal direction of the outer frame plate portion 211 are connected by the side plate portions 215, and open at both ends in the longitudinal direction. It has the opening pipe part 217 which forms 218. FIG.

  The thin plate 22 is formed in a rectangular shape having a size that covers the two holes 213 of the rigid portion 21 with a flexible elastically deformable plate material. The thin plate 22 is joined to the periphery of the hole 213 on the outer surface of each frame plate 210 by a joining means such as brazing, whereby the two holes 213 are closed by the single thin plate 22. The material of the thin plate 22 is preferably a metal plate having heat resistance and oxidation resistance, such as stainless steel or aluminum such as SUS444, and the thickness thereof is, for example, about 0.1 mm.

  As shown in FIGS. 3 and 4, the tubular body 25 accommodated in the housing 20 is formed in a longitudinal direction of a pair of upper and lower flat rectangular main plate portions 251 parallel to the upper and lower frame plates 210 of the housing 20. Are connected by a side plate portion 252 parallel to the side plate portion 215 of the housing 20, and the outer surfaces of both end opening edges are on the inner surface of the opening tube portion 217 of the rigid portion 21 of the housing 20. The cross section is U-shaped with a concave inward, and is joined through an oval sealing cover 26 as a whole.

  The inside of the pipe body 25 is formed as a pipe line 253 through which the heating fluid H (see FIGS. 3 and 4) flows from one opening toward the other opening. A pair of fins 7 that collect and transfer the heat to the tubular body 25 are provided.

  As shown in FIG. 6, the pair of fins 7 have the same structure and are divided in the vertical direction in the same figure, and are in contact with the upper main plate portion 251 of the tube body 25 and the lower main plate portion 251. A pair of upper and lower contacts with those in contact with each other.

  As shown in FIG. 7, one fin 7 is formed of a bellows-like corrugated plate in which V-shaped portions 71 bent in a substantially V-shaped cross section are formed by bending one plate material. The V-shaped portions 71 of the fins 7 are arranged in parallel so that the front end portions 711 that are bent are alternately turned up and down along the bending direction (FIG. 7A: arrow Y1 direction) of the fin 7 that extends while being bent. The height of the V-shaped portion 71, that is, the height of the entire fin 7 is set to a dimension slightly smaller than half of the interval between the upper and lower main plate portions 251 of the tube body 25. The tunnel-shaped space 712 inside the V-shaped portion 71 is orthogonal to the bending direction, and extends in a linear direction (FIG. 7A: arrow X1 direction) in which the orthogonal direction is a straight line. FIG. 7 is a view for explaining the shape of the fin 7 in an easy-to-understand manner, and the cross-sectional shape and number of the V-shaped portion 71 are appropriately designed.

  In the fin 7, a plurality of slits 72 along the plane formed in the height direction (FIG. 7A: arrow Z1 direction) orthogonal to the bending direction and the linear direction are equally spaced in the linear direction. Is formed. As shown in FIG. 7B, the slit 72 is formed by cutting in most of the upper region, leaving a lower end (hereinafter referred to as a connecting portion) 721 in the height direction. In this case, the connecting portion 721 is provided at both end portions of the fin 7 in the bending direction, and the tip portion 711 of each V-shaped portion 71 protruding downward in FIG. 7 between the both end portions. The fins 7 are not divided by the slits 72 and are configured as one piece. In this case, the connecting portion 721 is provided by forming the slit 72 leaving the plate thickness of the fin 7.

  As shown in FIG. 6, the fins 7 having the above-described configuration are made into a set, and as shown in FIG. 6, the connecting portion 721 side is brought into contact with the pipe 253 inside the tube body 25 toward each main plate portion 251, and the space 712 is formed. Is made parallel to the direction of the pipe line 253 (X direction in FIGS. 1 and 3), and each connecting portion 721 extending in the linear direction is joined to the main plate portion 251 by joining means such as brazing, It is fixed to the tube body 25.

  In this way, the fins 7 that are divided in the vertical direction in the pipe 253 are bent so that the tip portions 711 of the V-shaped portion 71 in which the slits 72 are formed are opposed to each other. The direction is arranged and adjusted. Since the height of the fin 7 is slightly smaller than half of the interval between the main plate portions 251, an interval is formed between the front end portions 711 facing each other, and the fins 7 are not joined to each other. (In FIG. 2 and FIG. 4, the tip portions 711 are in contact with each other, but are actually spaced apart). Due to the arrangement state of the fins 7, the slits 72 are opened on opposite sides, and are formed along the direction intersecting the direction of the pipe line 253. The connecting portion 721 is connected to the both ends in the Y direction in FIG. 2 intersecting the direction of the pipe line 253 and the tip portion 711 of the V-shaped portion 71 joined to the main plate portion 251 between both ends. Is provided. The heating fluid H flowing through the pipe 253 passes through the tunnel-like space 712 of the fin 7 while contacting the main plate portion 251 and the fin 7.

  The fin 7 is manufactured using a metal plate having a heat resistance and an oxidation resistance such as stainless steel such as SUS444 or aluminum and having a plate thickness of, for example, about 0.1 mm, for example, like the thin plate 22.

  In the present embodiment, the thickness t of the connecting portion 721 is set to about the plate thickness of the fin 7 as shown in FIG. 7B. However, the thickness t of the fin 7 is 2 as shown in FIG. You may set to about twice. Further, the connecting portion 721 is not left at the tip portion 711 of the V-shaped portion 71, and the thickness t is, for example, about twice the plate thickness of the fin 7 only at both ends in the bending direction as shown in FIG. May be provided. In this case, the slit 72 is formed by cutting the entire V-shaped portion 71. Specifically, the thickness t of the connecting portion 721 is preferably about 0.1 to 1.0 mm.

  That is, the connecting portion 721 is provided in order to obtain a state in which the V-shaped portion 71 and the space 712 are aligned along the linear direction without the fin 7 being divided in the linear direction by the slit 72 and the fin 7 being integrated. In the present invention, the object is achieved by providing at least both ends in the bending direction.

  The fins 7 in the form of leaving the connecting portions 721 at both ends in the bending direction and the tip portions 711 of the V-shaped portions 71 as in the fins 7 shown in FIGS. And after forming in a corrugated board, it can obtain by the processing method of forming the slit 72 in the V-shaped part 71 so that the connection part 721 may be left. Further, as shown in FIG. 10, the fin 7 in the form in which the connecting portions 721 are left only at both ends in the bending direction shown in FIG. 9 is formed on a flat rectangular plate material 7A, as shown in FIG. Is obtained by forming a plurality of parallel slits 72 at equal intervals, leaving the connection portion 21, and then bending so that a plurality of V-shaped portions 71 are formed along a direction perpendicular to the slits 72. be able to.

  The same material as that of the thin plate 22 is used for the rigid portion 21, the tubular body 25, and the sealing cover 26 of the casing 20 that constitute the sealed container 2. A plurality of thermoelectric conversion modules 4 are respectively disposed between the thin plate 22 of the casing 20 and the main plate portion 251 of the tubular body 25 of the sealed container 2.

  As shown in FIG. 6, the thermoelectric conversion module 4 includes an electrode 42 made of a metal plate such as a rectangular copper plate on one side and the other side of a plurality of thermoelectric conversion elements 41 arranged in a plane. Thus, the electrode 42 on one surface side is joined to the outer surface of the main plate portion 251 of the tubular body 25 by a joining means such as brazing. The electrode 42 on the other side faces the inner surface of the thin plate 22 of the housing 20, and the buffer material 5 is held between the thin plate 22 and the electrode 42. The thin plate 22 and the buffer material 5 and the buffer material 5 and the electrode 42 are not joined, but are in contact with each other so as to be slidable. In this case, one thermoelectric conversion module 4 is incorporated in parallel with the thin plate 22 that closes one hole 213 of the housing 20, and a total of four thermoelectric conversion modules 4 are equipped. The electrode 42 is insulated from the tube body 25 and the buffer material 5.

  The buffer material 5 is preferably a flexible sheet-like material such as a thin carbon sheet. In the present embodiment, the buffer material 5 is sandwiched between the thin plate 22 and the thermoelectric conversion module 4. However, the buffer material 5 is used as necessary, and the thin plate 22 directly contacts the thermoelectric conversion module 4. Can be selected.

  As the thermoelectric conversion element 41 constituting the thermoelectric conversion module 4, a type having a high heat-resistant temperature is used. For example, a silicon-germanium system, a magnesium-silicon system, a manganese-silicon system, an iron silicide system, or the like is preferably used. The decompression space 29 of the sealed container 2 in which the thermoelectric conversion module 4 is housed is hermetically sealed by a casing 20, a tubular body 25, and a sealing cover 26 that are formed of the rigid portion 21 and the thin plate 22. As shown in FIG. 4, the fin 7 has a size corresponding to the thermoelectric conversion module 4, and the thermoelectric conversion module 4 is disposed on both sides of the fin 7.

  The sealed container 2 is stored in a water-cooled jacket 3. As shown in FIGS. 3 and 4, the water-cooling jacket 3 has a sealing frame portion 31 that is bent inward and formed on the opening edges at both ends, on the outer surface of the outer frame plate portion 211 of the rigid portion 21 in the sealed container 2. And airtightly joined by means such as brazing. A space in the water cooling jacket 3, that is, a space formed between the rigid portion 21 and the water cooling jacket 3 is a cooling space 32 for cooling the thin plate 22 by supplying cooling water. A cooling water inlet / outlet 33 is provided at a central portion of the water cooling jacket 3 corresponding to each side plate portion 215 of the housing 20.

  A total of four thermoelectric conversion modules 4 are accommodated in the sealed container 2, and these thermoelectric conversion modules 4 are connected in series. Then, electricity is taken out from the two lead wires 49 of + • − shown in FIGS. The lead wire 49 passes through the side plate portion 215 and the water cooling jacket 3 of the sealed container 2 and is drawn to the outside, and the lead wire through hole of the side plate portion 215 and the water cooling jacket 3 is hermetically closed.

  The heat exchange means 6 is joined to the thin plate 22 at a location corresponding to the thermoelectric conversion module 4 in the cooling space 32. The heat exchange means 6 is provided in a state in which the cooling of the thin plate 22 is not hindered by the cooling water supplied to the cooling space 32 being brought into contact to dissipate the thin plate 22 to promote cooling.

  Examples of the heat exchanging means 6 include a heat exchanging member such as a fin having flexibility that does not hinder the flexibility of the thin plate 22. Moreover, even if it is a heat exchange member such as a hard fin, a plurality of independent heat exchange members are provided in contact with the thin plate 22 in a scattered manner so as not to hinder the flexibility of the thin plate 22. Also good.

  The sealed container 2 sucks air in the decompression space 29 from a decompression sealing port (not shown) formed at a predetermined location to decompress the decompression space 29 to a predetermined pressure (for example, about 1 to 100 Pa). Are hermetically sealed by welding or the like. As a result, in the sealed container 2, a pressure difference is generated in which the pressure in the decompression space 29 is lower than that in the outside atmosphere, and the force that pressurizes the thin plate 22 of the housing 20 toward the thermoelectric conversion module 4 due to the pressure difference. Receive.

[2] Action of Power Generation Device In the power generation device 1 having the above-described configuration, the pipe body 25 is heated by flowing a high-temperature heating fluid H from one opening to the other opening in the pipe line 253 of the pipe body 25. In addition, the cooling water is introduced into the cooling space 32 from one introduction outlet 33 of the water cooling jacket 3, the cooling water is discharged from the other introduction outlet 33, and the cooling space 32 is filled with the cooling water to be sealed. The thin plate 22 of the container 2 is cooled.

  The heat of the heating fluid H that flows through the pipe 253 directly heats the pair of opposing main plate portions 251 of the tube body 25, and is collected by the fins 7 and transmitted to each main plate portion 251, and the high temperature of the main plate portion 251. Is promoted. Heat of the main plate portion 251 of the heated tube body 25 is transmitted to the inner surface side of the thermoelectric conversion module 4, and the inner surface side of the thermoelectric conversion module 4 is heated. On the other hand, the cooling of the thin plate 22 is promoted by the heat exchange means 6 that is cooled by cooling water. The heat of the cooled thin plate 22 is transmitted to the outer surface side of the thermoelectric conversion module 4, and the outer surface side of the thermoelectric conversion module 4 is cooled. Thereby, a temperature difference is given to the thermoelectric conversion element 41 of the thermoelectric conversion module 4 so that the inner surface side is high temperature and the outer surface side is low temperature.

  In the hermetic container 2, the internal decompression space 29 is decompressed as described above to generate a pressure difference with the outside, whereby the thin plate 22 of the housing 20 is pressurized toward the thermoelectric conversion module 4. Thereby, the thin plate 22 of the housing | casing 20 is pressurized and closely_contact | adhered to the shock absorbing material 5, and the shock absorbing material 5 closely_contact | adheres in the state pressurized to the thermoelectric conversion module 4 side.

  As described above, a temperature difference is given between the outer surface side and the inner surface side of the thermoelectric conversion module 4, so that the thermoelectric conversion module 4 generates power and electricity is extracted from the lead wire 49.

  In the power generation apparatus 1 of this embodiment, for example, exhaust heat gas generated in a factory or a garbage incinerator, automobile exhaust gas, or the like is used as the heating fluid H.

[3] Advantageous Effects of One Embodiment In the power generation apparatus 1 of the above embodiment, the heat of the heating fluid H that flows through the pipe line 253 of the pipe body 25 is collected by the fins 7 and transmitted to the pair of main plate portions 251. The temperature difference generated in the thermoelectric conversion module 4 is increased by increasing the temperature of the main plate portion 251 and the power generation efficiency is improved.

  By the way, a thermal stress due to a thermal expansion difference is generated in the thermoelectric conversion element 41 of the thermoelectric conversion module 4 to which a temperature difference is given, and the thermal stress is transmitted to the main plate portion 251 of the tubular body 25 and tries to deform the main plate portion 251. . Here, conventionally, the tubular body to which the fins are joined has increased in rigidity and is difficult to be deformed. For this reason, the thermoelectric conversion element has a problem that it receives a stress from the tubular body and is cracked or broken.

  However, the fin 7 of the present embodiment is divided into one side and the other side of the pair of main plate portions 251 of the tube body 25, and the divided fins 7 are spaced apart from each other and are in a non-joined state. For this reason, although the divided fins 7 are joined to the pair of main plate portions 251, the pair of main plate portions 251 are not integrally coupled via these fins 7, and therefore The main plate portion 251 is restrained from being restricted by the fins 7 and having high rigidity. As a result, the main plate portion 251 is deformed in such a manner that it warps or warps with respect to a direction (Y direction in FIG. 3) that intersects with the direction of the conduit 253 (flow direction of the heated fluid H) of the tubular body 25 in particular. Cheap.

  On the other hand, each of the divided fins 7 is formed with a plurality of slits 72 that open to the opposite side of the joined main plate portion 251 along the direction intersecting the pipe 253, and this also causes the main plate portion to be formed. It is suppressed that the rigidity of 251 becomes high. If the slits 72 are not formed in the fin 7, the connecting portions 721 extending in the direction of the pipe line 253 are joined to the main plate part 251, so that the fin 7 in that case is opposite to the direction of the pipe line 253. Deformation is unlikely to occur. However, in the present embodiment, the plurality of slits 72 are formed in the fin 7 so that the main plate portion 251 is warped or distorted with respect to the direction of the duct 253 (X direction in FIGS. 3 and 4). Deformation tends to occur. That is, if the main plate portion 251 is deformed in a form of warping or distorting with respect to the direction of the duct 253, the fin 7 deforms following the main plate portion 251 due to the slit 72 becoming narrower or wider. Therefore, the main plate portion 251 is deformed without being restrained by the fins 7.

  As described above, the fin 7 is divided into one side and the other side of the main plate portion 251 of the tube body 25, and the slit 72 is formed in the fin 7 along the direction intersecting the direction of the duct 253 of the tube body 25. As a result, the main plate portion 251 is restrained from increasing in rigidity even if the fins 7 are joined, and the main plate portion 251 is deformed in both the direction of the pipe 253 and the direction intersecting the pipe 253. It is easy, that is, it can be deformed in almost any direction. Therefore, the main plate portion 251 is deformed in accordance with the thermal stress applied to the thermoelectric conversion element 41, so that the stress that the thermoelectric conversion element 41 receives from the main plate portion 251 is reduced as compared with the conventional case. As a result, damage to the thermoelectric conversion element 41 is effectively suppressed.

  In addition, each of the divided fins 7 is not divided by the connecting portion 721 even if the slit 72 is formed, and is configured integrally with the connecting portion 721. 11A, the V-shaped portion 71 and the space 712 extend along the direction of the pipe 253 while providing the slit 72 in the divided fin divided body 89. It is difficult to align the main plate portion 251 so that the main plate portion 251 is aligned. For this reason, as shown to FIG.11 (b), (c), each fin division body 89 tends to shift | deviate and be arrange | positioned in a bending direction. However, since the fin 7 of the present embodiment is an integral part provided with the connecting portion 721 and not completely divided by the slit 72, the V-shaped portion 71 is maintained in an aligned state and can be easily handled. The work of assembling 7 inside the tubular body 25 becomes easy.

  Further, when the V-shaped portion 71 is not in a state along the direction of the pipe line 253 due to the division of the fin 7, the cross-sectional area of the fin 7 becomes large, and as a result, as shown in FIG. The effective cross-sectional area of the space 712 in which H flows becomes narrow, and the pressure loss of the heating fluid H increases. However, in the present embodiment, the V-shaped portions 71 are aligned in the direction of the pipe line 253, and the space 712 is not narrowed. Therefore, the pressure loss of the heating fluid H does not increase, leading to problems such as a decrease in power generation efficiency due to the pressure loss. There is nothing.

[4] Other Embodiments The arrangement state and shape of the pair of fins according to the present invention are not limited to the above embodiment, and one side and the other side of the pair of heating plate portions (main plate portion 251 in the above embodiment). In addition, the fins are divided in a non-joined state, and each fin is formed with a slit that is open on a side facing each other and that intersects the direction of the pipe 253, and at least the pipe 253. As long as the connection part which does not divide a fin with a slit is provided in the both ends of the direction which cross | intersects this direction, what kind of form may be sufficient.

  For example, as shown in FIG. 12, the pair of fins 7 may be arranged in such a manner that the tip portions 711 do not face each other and are shifted by a half pitch in the bending direction so that the tip portions 711 correspond to the spaces 712. Moreover, fin 8A, 8B shown to Fig.13 (a) has the height direction center part of the sheet | seat corrugate board 8 which has the height equivalent to the space | interval between a pair of main plate parts 251 shown in FIG.13 (b). The tip portion 811 of the V-shaped portion 81 is joined to each main plate portion 251 respectively.

DESCRIPTION OF SYMBOLS 1 ... Thermoelectric conversion type electric power generation apparatus 25 ... Tube 251 ... Main plate part (heating plate part)
253 ... Pipe line 3 ... Water cooling jacket (cooling part)
DESCRIPTION OF SYMBOLS 4 ... Thermoelectric conversion module 41 ... Thermoelectric conversion element 7, 8A, 8B ... Fin 72 ... Slit 721 ... Connection part H ... Heating fluid

Claims (2)

A pipe body that includes at least a pair of opposed heating plate portions, and in which a pipe line through which a heating fluid flows is formed;
A cooling part disposed on the outer surface side of the heating plate part;
A thermoelectric conversion module having a thermoelectric conversion element disposed between the heating plate portion and the cooling portion;
A fin disposed inside the tubular body and joined to the heating plate portion, collecting heat of the heating fluid and transmitting it to the heating plate portion, and
In the thermoelectric conversion power generator that generates power by giving a temperature difference to the thermoelectric conversion module by the heating plate part and the cooling part,
The fins are divided in a non-bonded state to one side and the other side of the pair of heating plate portions,
Each of the divided fins is formed with slits that open on opposite sides and extend along the direction intersecting the direction of the pipe line, and at least both ends in the direction intersecting the direction of the pipe line The thermoelectric power generation apparatus according to claim 1, further comprising a connecting portion that does not divide the fin by the slit.   The thermoelectric conversion power generator according to claim 1, wherein the fin is formed of a corrugated plate.

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