JP2011191049A - Heat exchanger, and heating device using heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage of a heat exchanger due to repeating of thermal expansion and contraction, to prevent deterioration of heat exchanger effectiveness, to elongate a durable period of the heat exchanger, to facilitate the manufacture and reduce costs of the manufacture of the heat exchanger, and to facilitate maintenance. <P>SOLUTION: The heat exchanger includes a cylindrical heat exchange tube 2 opened in both ends, and a heat collector 3 installed in an interior of the heat exchange tube 2. The collector 3 includes a cylindrical part 31, and a heat collection fin 32 formed integrally with the cylindrical part 31 and extending inward of the cylindrical part 31 from an inner wall surface 312 of the cylindrical part 31. A recessed part 41 continuous throughout a longitudinal direction of the cylindrical part 31 and projecting inward of the cylindrical part 31 is formed on an outer peripheral surface of the cylindrical part 31. At least, when the heat collector 3 is heated and expanded, the heat exchange tube 2 and the heat collector 3 become an interference fitting state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger and a heating device using the heat exchanger, and in particular, a tubular heat collector having heat collection fins is installed inside a heat exchange tube, and exchanges heat with fluid in the heat collector. The present invention relates to a heat exchanger that performs heat exchange with a fluid outside a pipe, and a heating device that uses the heat exchanger.

  2. Description of the Related Art Conventionally, a heat exchanger is known in which a fluid is allowed to flow inside a tubular body and heat exchange with a fluid outside the tubular body is performed. And in order to improve the efficiency of heat exchange, fixing a heat collection fin to the inner wall of a tubular body is also performed.

  As such a heat exchanger, for example, as shown in FIGS. 10 and 11, a flat plate 90 is bent and formed into a cylindrical shape having side walls substantially perpendicular to the left and right sides. A heat exchanger 9 is proposed in which a U-shaped or L-shaped copper fin 91 is fixedly welded to the inner surface of the wall along the longitudinal direction, and the ends of the plate 90 are welded to each other to form a cylindrical shape. (For example, refer to Patent Document 1).

  Moreover, in the said patent document 1, the liquid heating apparatus using the said heat exchanger is proposed. In this liquid heating apparatus, the heat exchanger is directly welded to the side wall of the liquid tank of the liquid heating apparatus and installed in the liquid tank, and the heat of the combustion gas flowing in the cylindrical heat exchanger is It transmits to the liquid which exists in the outer side of the heat exchanger in a tank, and heats the liquid in a liquid tank.

JP 2000-157425 A

  However, in the heat exchanger disclosed in Patent Document 1, since the heat collecting fins are fixed to the cylindrical body by welding, the fins peel from the cylindrical body due to expansion and contraction due to repeated use. Thus, there are problems that the heat exchanger is easily damaged and the heat exchange rate is lowered, and that the lifetime of the heat exchanger is short. In particular, this problem is remarkable when the materials of the cylindrical body and the fin are different, and the thermal expansion coefficients are different. As disclosed in the above-mentioned Patent Document 1, in the stainless steel cylindrical body and the copper fin, This problem was remarkable.

  In addition, when the fins are peeled off from the cylindrical body, the cylindrical body is directly welded to the side wall of the liquid tank of the liquid heating device. Therefore, in order to repair, the welded portion is melted or cut. Thus, it is necessary to remove the heat exchanger from the side wall of the liquid tank of the liquid heating apparatus, but this operation is difficult, time consuming, expensive, and not easy to maintain. In particular, when copper fins are used, the weight is heavy and maintenance is further difficult.

  In addition, since combustion gas passes through the cylindrical body of the heat exchanger, dirt such as soot adheres to the inner walls and fins of the cylindrical body, and the heat exchange rate cannot be reduced. Although it is necessary to perform maintenance, in the heat exchanger disclosed in Patent Document 1, the heat collecting fins are fixed to the cylindrical body by welding, and the cylindrical body is a side wall of the liquid tank of the liquid heating device. There is a problem that maintenance such as cleaning inside the heat exchanger is not easy.

  Also, in the manufacture of the heat exchanger, the bending of the flat plate, the bending of the fin, the welding of the fin to the flat plate, and the welding of the flat plate, the process is complicated and cannot be manufactured easily. There was a problem of high costs. In particular, in the case of using copper fins, the problem of the manufacturing cost is remarkable, and the weight is heavy, and the manufacturing is further difficult.

  Therefore, the present invention prevents the heat exchanger from being easily damaged even by repeated expansion and contraction due to repeated use, and prevents the heat exchange rate from being lowered. The purpose is to lengthen.

  Moreover, it aims at facilitating maintenance, such as repair by the damage of a fin, and internal cleaning.

  Another object of the present invention is to facilitate the manufacture of a heat exchanger or a heating device using the heat exchanger and reduce the manufacturing cost.

  The present invention as a means for solving the above problems is a heat exchanger for transferring the heat inside the heat exchanger to a heated body outside the heat exchanger, and is a cylindrical heat exchange tube having both ends opened, A heat collecting body installed inside the heat exchange tube, the heat collecting body being integrally formed with the tubular portion and the tubular portion, and from the inner wall surface of the tubular portion to the inside of the tubular portion; The heat exchanger tube and the heat collector are in a state of tight fit when at least the heat collector is heated and expanded. It is a heat exchanger.

  And since the cylindrical portion and the heat collecting fin are integrally formed, the heat collecting fin is not peeled off from the cylindrical body, the heat exchanger is hardly damaged, and the heat exchange rate can be prevented from being lowered, The service life of the heat exchanger can be extended. Moreover, since the heat exchanger tube and the heat collector are separate, the heat collector can be easily inserted into and removed from the heat exchanger tube, so that the maintenance of the heat exchanger and the heating device using the heat exchanger is facilitated. Further, the component can be constituted by two points, that is, a heat exchange tube and a heat collector, and bending and welding of members are unnecessary, the manufacturing process is simple, the manufacturing can be easily performed, and the manufacturing cost can be reduced.

  Further, in the heat exchanger, a concave portion is formed on an outer peripheral surface of the cylindrical portion of the heat collector so as to continue in the longitudinal direction of the cylindrical portion and project inward of the cylindrical portion. It is the heat exchanger characterized by having.

  With such a configuration, the diameter and outer peripheral shape of the cylindrical portion can be deformed and reduced, and even when the interference fit state is applied before heating, the heat collector is inserted into and removed from the heat exchange tube. It can be easy. In addition, when the cylindrical part expands, the concave part absorbs the expansion, and the expansion direction can be controlled, preventing the cylindrical part from extending its diameter and expanding the outer periphery, so that the heat collector adheres closely to the heat exchange tube. The expansion is possible, and the stress to the heat exchange pipe can be suppressed to prevent the heat exchange pipe and the heat exchanger from being damaged.

  Further, in the above heat exchanger, the heat exchange tube and the heat collector are in a state of interference fit before the heat exchange tube and the heat collector are heated. It is a vessel. With such a configuration, the heat exchange rate from the heat collector to the heat exchange tube can be improved.

  Further, in the heat exchanger, the heat exchange tube and the heat collector are in a loose fit state before the heat exchange tube and the heat collector are heated. It is a vessel. With such a configuration, the heat collector can be easily inserted into and extracted from the heat exchange tube, the manufacturing process is simple, the manufacturing can be easily performed, the manufacturing cost can be reduced, and the maintenance is facilitated.

  In the heat exchanger, the heat collector is formed by being divided in a direction parallel to the axis of the heat collector, or is formed by being divided in a direction perpendicular to the axis of the heat collector. It is a heat exchanger characterized by this. With such a configuration, the heat collector can be easily inserted into and extracted from the heat exchange tube, the manufacturing process is simple, the manufacturing can be easily performed, the manufacturing cost can be reduced, and the maintenance is facilitated.

  In the above heat exchanger, the heat collecting body is formed by combining a plurality of divided bodies having the same shape.

  In the above heat exchanger, the heat collector includes a heat collecting fin that is at least partially curved in a cross-sectional view perpendicular to the axial direction of the heat collector. It is.

  In the heat exchanger, the heat collector is made of an aluminum alloy or pure aluminum, and the heat exchange tube is made of stainless steel.

  In the heat exchanger, the surface of the heat collector is anodized.

  Furthermore, a heat exchanger manufacturing method for transferring heat inside the heat exchanger to a heated object outside the heat exchanger, wherein a cylindrical heat exchange tube having both ends opened is molded, A heat collecting body having a heat collecting fin extending from the inner wall surface of the tubular portion to the inside of the tubular portion is integrally formed, and the heat collecting body is inserted into the heat exchange tube. It is the manufacturing method of the heat exchanger characterized by installing in the state for this.

  Furthermore, it is a heating device using the heat exchanger, and the heating device includes a liquid tank above the inside of the main body, and the heat exchanger is installed across the opposing surface of the liquid tank. A heating apparatus characterized by being a liquid heating apparatus.

  Moreover, the said liquid heating apparatus can be a rice noodle device or a fryer.

  According to the present invention as described above, it is possible to prevent the heat exchanger from being easily damaged even by repeated expansion and contraction due to repeated use, and it is possible to prevent a decrease in the heat exchange rate, It has become possible to extend the service life of the heat exchanger.

  In addition, it is possible to facilitate maintenance such as repair of the heat collection fins due to breakage and internal cleaning.

  In addition, it is possible to facilitate the manufacture of the heat exchanger, reduce the manufacturing cost, and further facilitate the manufacture of the heating device using the heat exchanger. At the same time, manufacturing costs can be reduced.

1 is a partially broken perspective view of an embodiment of the heat exchanger of the present invention. Example sectional view of heat collector of heat exchanger of the present invention Partial cross-sectional view of the heat exchanger embodiment of the present invention Sectional drawing of one Example of the division body which comprises a heat collecting body Example of perspective view of heat collector The heat exchanger and other embodiments of the present invention perspective view 1 is a perspective view of a liquid heating apparatus according to an embodiment of the present invention. Side view of one embodiment of the liquid heating apparatus of the present invention Front view of an embodiment of the liquid heating apparatus of the present invention Front view showing a conventional heat exchanger Sectional view showing a conventional heat exchanger

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. A heat exchanger 1 according to the present invention includes a cylindrical heat exchange pipe 2 that is formed separately and is open at both ends, and a heat collector 3 that is installed without being fixed inside the heat exchange pipe 2. ing.

  As shown in FIGS. 1, 6, and 8, the heat exchange tube 2 has a cylindrical shape with both ends opened, and a cross section perpendicular to the axis of the heat exchange tube 2 is formed in a circular shape. It is a columnar tube and is formed using stainless steel. The heat exchange tube 2 is a member for receiving the heat collected by the heat collector 3 and transmitting it to the heated object existing outside the heat exchange tube 2.

  The length, outer diameter, and thickness in the axial direction (longitudinal direction) of the heat exchange tube 2 are not particularly limited, and the material of the heat exchange tube 2, the equipment such as a heating device in which the heat exchange tube 2 is used, and the heat required there Although it can select suitably according to exchange performance etc., for example, when a material is JIS SUS304, length can be 312 mm, an outer diameter can be 76 mm, and thickness can be 3 mm. The thickness is preferably about 1.5 to 4 mm. If the thickness is 1.5 mm or less, the strength is weak. If the thickness is 4 mm or more, the heat exchange rate decreases.

  The shape of the heat exchange tube 2 is not limited to a circular cross section in the direction perpendicular to the axis, but may be a triangle, a quadrangle, or other polygons. The material is not limited to stainless steel, and aluminum and its alloys It is good also as using metals, such as.

  The heat collector 3 is formed using an aluminum alloy, and as shown in FIG. 2A, the heat collector 3 has a cylindrical shape with both ends opened, and is perpendicular to the axis of the heat collector 3, that is, the longitudinal direction. A cylindrical part 31 whose outer shape is circular in cross section is provided, and a heat collecting fin 32 extending from the inner wall surface 312 of the cylindrical part 31 to the inside of the cylindrical part 31. It is configured. The heat collecting fins 32 are formed integrally with the cylindrical portion 31. Therefore, even if stress due to thermal expansion is applied, the heat collecting fins 32 are not peeled off or separated from the cylindrical portion 31, and damage to the heat collecting body 3 and consequently the heat exchanger 1 can be prevented. Note that the material of the heat collector 3 is not limited to an aluminum alloy, and a metal such as stainless steel or pure aluminum may be used.

  The cylindrical portion 31 is heated from a heated fluid such as a combustion gas that flows into the space 5 between the heat exchange pipe 2 and the heat collector 3 formed by the inner side of the cylindrical portion 31 or in addition, a concave portion 41 described later. Is a member for collecting the heat collected by the heat collection fins 32 and transmitting the collected heat to the heat exchange pipe 2. The heat transferred to the heat exchange pipe 2 is outside the heat exchange pipe 2. It is transmitted to a heated object that is a liquid or gas such as water or oil.

  The length, outer diameter, and thickness of the cylindrical portion 31 are less than the length of the heat exchange tube 2 and less than the inner diameter, and the material of the heat collector 3 and heat collection Although it can select suitably according to apparatuses, such as a heating apparatus in which the body 3 is used, and the heat exchange performance calculated | required there, for example, when a material is JISA6063, length is 250 mm and an outer diameter is 72. The thickness can be 5 mm and the thickness can be 3 mm. The thickness is preferably about 1.5 to 4 mm. If the thickness is 1.5 mm or less, the strength is weak. If the thickness is 4 mm or more, the heat exchange rate decreases.

  The heat collector 3 is inserted and installed in the heat exchange tube 2 without being fixed by welding or other methods. The inner shape of the heat exchanger tube 2 and the outer shape of the heat collector 3 are such that the heat collector 3 can be inserted into and removed from the heat exchanger tube 2, and at least the inside of the cylindrical portion 31 of the heat collector 3 is heated. As a result, when the heat collector 3 expands, or when the heat collector 3 and the heat exchange tube 2 expand, the outer wall surface 313 of the cylindrical portion 31 of the heat collector 3 is inside the heat exchange tube 2. It is formed in a shape that is in close contact with the wall surface 26. That is, when the heat collector 3 is expanded, the heat exchange tube 2 and the heat collector 3 are formed so as to have an interference fit.

  When the heat exchanger 1 is configured using the heat exchanger tube 2 and the heat collector 3 having the materials and dimensions as in the above example, the heat exchanger tube 2 is heated before the heat collector 3 and the heat exchanger tube 2 are heated. And the heat collector 3 are loosely fitted. By setting it as such a structure, the insertion / extraction of the heat collecting body 3 to the heat exchange pipe 2 becomes easy. In such a case, a clip-shaped stopper or the like is installed on the heat exchange pipe 2 in order to hold the heat collection body 3 on the heat exchange pipe 2 so that the heat collection body 3 does not accidentally fall off from the heat exchange pipe 2. May be. When the heat exchange tube 2 and the heat collector 3 are configured to be loosely fitted before heating in this way, the material of the heat exchange tube 2 has a smaller coefficient of thermal expansion than the material of the heat collector 3. Made of material.

  Further, the heat exchanger 1 may be configured in a state in which the heat exchanger tube 2 and the heat collector 3 are fitted together before the heat collector 3 and the heat exchanger tube 2 are heated. As a manufacturing method in this case, the heat collecting body 3 and the heat exchange pipe 2 are separately formed, and the heat collecting body 3 is inserted into the heat exchange pipe 2 by press fitting or the like, and installed in a tight fit state. It can be adopted. By adopting such a configuration, it is possible to prevent the heat collector 3 from being inadvertently removed from the heat exchange tube 2, and the outer wall surface 313 of the cylindrical portion 31 of the heat collector 3 is formed from the heat exchange tube 2. It is possible to improve the heat exchange performance by being in close contact with the inner wall surface.

  The tight fit state means that there is no gap between the inner wall surface 26 of the heat exchange tube 2 and the outer wall surface 313 of the heat collector 3, and the inner wall surface 26 of the heat exchange tube 2 and the heat collector are in close contact. 3 is a state in which the outer wall surfaces 313 are applying pressure to each other, the heat collector 3 is not movable in the direction perpendicular to the axis of the heat collector 3, and is capable of interference when inserted. Say. However, even if there is a gap that occurs when the inner shape of the heat exchange tube 2 and the outer shape of the heat collector 3 are not completely similar, it is assumed that the state is an interference fit. Further, the loose fit state is a state in which there is a gap between the inner wall surface 26 of the heat exchange tube 2 and the outer wall surface 313 of the heat collector 3 and the heat collector 3 is not in close contact. A state in which the body 3 can move in the direction perpendicular to the axis.

  The shape of the cylindrical portion 31 can be inserted into and removed from the heat exchange tube 2, and at least the inside of the cylindrical portion 31 of the heat collector 3 is heated. As a result, the heat collector 3 and the heat exchange tube 2 are If the outer wall surface 313 of the cylindrical portion 31 of the heat collector 3 is in close contact with the inner wall surface 26 of the heat exchanger tube 2 when expanded, the cross section is not limited to a circle, and is adapted to the inner shape of the heat exchanger tube 2. , Triangles, squares, and other polygons. Since the entire surface of the outer wall surface 313 of the cylindrical portion 31 is brought into close contact with the inner wall surface 26 of the heat exchange tube 2, the cross section of each of the outer shape of the cylindrical portion 31 and the inner shape of the heat exchange tube 2 may be similar. preferable.

  The length of the heat collector 3 is formed to be equal to or less than the length of the heat exchange pipe 2, but is formed to be less than the length of the heat exchange pipe 2, and as shown in FIG. It is preferable to install the heat collector 3 at a predetermined distance from the end of the heat exchange tube 2 on the side where the heated fluid flows (on the left front side in the figure). By setting it as such a structure, the influence of the direct heat to the heat collection body 3 from heat generating instruments, such as a gas burner, can be reduced, and the deformation | transformation and deterioration of the heat collection body 3 can be suppressed. I can do it.

  The heat collection fins 32 are members for collecting heat from a heated fluid such as combustion gas flowing inside the cylindrical portion 31 and transmitting the heat to the cylindrical portion 31. As shown in FIGS. 1 and 2A, the heat collecting fins 32 project linearly from the inner wall surface 312 of the tubular portion 31 toward the center of the tubular portion 31 at a predetermined interval. At the same time, a plurality of linear portions are continuously formed in the longitudinal direction of the cylindrical portion 31. The height H of the heat collecting fins 32, that is, the height H from the base portion 321 in contact with the cylindrical portion 31 to the distal end portion 322 is set to an appropriate height equal to or less than the inner radius of the cylindrical portion 31, and each heat collecting fin 32 is the same, and is the same over the longitudinal direction of the cylindrical portion 31. Further, the thickness W of the heat collecting fin 32 is formed so that the thickness W2 of the tip end portion 322 is thinner than the thickness W1 of the base portion 321.

  The heat collecting fins 32 are not formed linearly and continuously in the longitudinal direction of the tubular portion 31, but are formed spirally in the longitudinal direction of the tubular portion 31, intermittently formed, or These shapes can be appropriately combined to form.

  Further, the heat collecting fins 32 are not limited to the above shape, and as shown in FIGS. 2B to 2G, the shapes (b) and (e) with different heights H, the base 321 to the tip 322. The shape (e) having the same thickness, the shape (f) in which a part or all of the shape is curved in a cross-sectional view perpendicular to the longitudinal direction of the heat collector 3, and the shape in which the heat collection fins 32 are complicated ( f), a shape (d) in which the auxiliary fins 325 protrude from one heat collecting fin 32 (d), a shape (d) in which the heat collecting fin 32 supports the cylindrical heat collecting fin 326 formed on the tubular portion 31, In a cross-sectional view perpendicular to the longitudinal direction of the heat collector 3, at least a portion is curved, a portion extends linearly toward the center of the cylindrical portion 31, and a portion of the curved heat collection fin 32 Is a length equal to or longer than the inner radius of the cylindrical portion 31 and the tip of the curved heat collecting fin 32 The portion is formed in a shape (g) inserted between the other two heat collecting fins 32, a shape refracted in a cross section perpendicular to the axis (not shown), or a combination of these appropriately. May be. By curving or bending the heat collecting fins 32, the inner surface area of the heat collecting body 3 can be increased, and the heat collecting efficiency can be increased.

  Further, the heat collector 3 may be formed so that the cross-sectional shape in the direction perpendicular to the longitudinal direction is the same in any cross-section in the longitudinal direction, but may be formed in a different shape. Good. As a specific example, the height H or length of the individual heat collection fins 32 is not the same in the longitudinal direction of the cylindrical portion 31 but is heated by combustion gas or the like as shown in FIG. Alternatively, the height H1 on the side into which the fluid flows (left side in the figure) can be lowered and increased toward a predetermined position on the back side (right side in the figure). This change in height can be linear or curved, and the change in height may be provided from one end to the other end of the cylindrical portion 31 in the longitudinal direction.

  With such a configuration, the temperature of the heated fluid generally decreases from the side where the heated fluid such as combustion gas flows in to the back side and the side where it discharges. By increasing the area of the fins, the heat collection effect can be enhanced and uniform heat exchange can be performed over the entire length of the heat exchanger 1.

  In order to increase the area of the heat collecting fins on the back side of the heat exchanger 1, in addition to the above configuration, a large number of heat collecting fins 32 can be formed on the back side from the side into which the heated fluid flows.

  As shown in FIGS. 1 and 2B to 2G, the cylindrical portion 31 is linearly continuous over the longitudinal direction of the cylindrical portion 31 and protrudes inward of the cylindrical portion 31. It is preferable to form the recess 41. Due to the recess 41, a groove-like depression having a predetermined depth is formed on the outer peripheral surface of the cylindrical portion 31, and a protrusion having a predetermined height is formed on the inner peripheral surface of the cylindrical portion 31. This recessed part 41 can give elasticity to the cylindrical part 31, shorten the diameter of the cylindrical part 31, and can shrink an outer periphery. The number of recesses 41 formed is not particularly limited, and about 1 to 6 is sufficient, but in order to increase the contact area between the outer wall surface 313 of the tubular portion 31 and the inner wall surface 26 of the heat exchange tube 2, It is preferable to reduce as much as possible, and about 1 to 4 is preferable. The recesses 41 are preferably provided at equal intervals on the outer peripheral surface of the cylindrical part 31 in order to make the balance between expansion and absorption of the cylindrical part 31 uniform.

  The concave portion 41 is formed by denting a part of the cylindrical portion 31 in the central axis direction of the cylindrical portion 31, and the wall surface forming the concave portion 41 is also the heat collecting fin 32. In this case, the heat collection fins 32 that form the recesses 41 heat the combustion gas or the like that flows in the space 5 between the heat exchange pipe 2 and the heat collector 3 formed by the recesses 41 in addition to the inside of the cylindrical part 31. Heat is also collected from the generated fluid. Note that the outer wall surface forming the recess 41 does not constitute the outer wall surface 313 of the cylindrical portion 31.

  The cross-sectional shape of the concave portion 41 in the direction perpendicular to the axis of the cylindrical portion 31 is not particularly limited, and a triangular shape having the outer peripheral surface of the cylindrical portion 31 as shown in FIG. c) to (e), the apex angle is a semi-circular shape with a semicircular cylindrical surface 31 as a base, and a semicircular shape, a semi-elliptical circular shape, and an apex angle, although not shown. An appropriate shape such as a triangular shape in contact with the outer peripheral surface of the cylindrical portion 31, a substantially circular shape with a part missing, or a fan shape can be used.

  With such a configuration, the diameter and outer peripheral shape of the cylindrical portion 31 can be deformed and reduced, and the outer peripheral shape can be removed when inserted into and removed from the heat exchange tube 2 even when it is in a state of interference fit before being heated. By reducing the size, insertion / removal can be facilitated. Further, when the cylindrical portion 31 is expanded, the concave portion 41 absorbs the expansion, and the expansion direction can be controlled, and the cylindrical portion 31 can be prevented from extending its diameter and expanding its outer periphery. The expansion can be performed while being in close contact with the exchange pipe 2, and the stress to the heat exchange pipe 2 can be suppressed, so that the heat exchange pipe 2 and the heat exchanger 1 can be prevented from being damaged.

  Further, when the recess 41 is not formed, the outer wall surface 313 of the cylindrical portion 31 needs to be in close contact with the inner wall surface 26 of the heat exchange tube 2 at least during expansion, and the cylindrical portion 31 expands due to the expansion of the cylindrical portion 31. Since it is necessary to design and form the part 31 and / or the heat exchange pipe 2 in such a range that the part is not damaged, the thickness of the cylindrical part 31 and the heat exchange pipe 2 are different from each other, even if they are the same. The expansion rate, expansion direction, and the like due to the difference in the configuration may be different. In some cases, the outer wall surface 313 of the cylindrical portion 31 may not be sufficiently in close contact with the inner wall surface 26 of the heat exchange tube 2. Formation is not easy. However, by forming the recess 41, the expansion of the cylindrical portion 31 can be absorbed and the direction of expansion can be controlled. Therefore, the design and formation are easy, and the outer wall surface 313 of the cylindrical portion 31 is formed on the heat exchange tube 2. The inner wall surface 26 can be securely adhered.

  Furthermore, the cylindrical portion 31 can be easily inserted into and removed from the heat exchange tube 2, and the outer wall surface 313 of the cylindrical portion 31 and the inner wall surface 26 of the heat exchange tube 2 can always be kept in close contact with each other.

  In addition, when the heat collecting fins 32 are continuously formed in a spiral shape in the longitudinal direction of the tubular portion 31, it is easy to manufacture the recessed portion 41 in a spiral shape in the longitudinal direction of the tubular portion 31. It is preferable.

  The heat exchange tube 2 and the heat collector 3 may be formed by a manufacturing method suitable for the material and shape used respectively. For example, the heat exchange tube 2 is formed by bending a flat plate and fixing both ends thereof by welding or the like. The heat collector 3 can be formed using extrusion, drawing, wire electric discharge machining using a columnar body, broaching, or the like. I can do it. Further, when the material of the heat collector 3 is a material that easily corrodes, such as aluminum, the surface of the heat collector 3, that is, the outer surface including the end face of the cylindrical portion 31, the inner surface, and the surface of the heat collection fin 32. May be anodized to prevent corrosion.

  The heat collector 3 is integrally formed, but may be formed separately. When divided and formed, the heat collecting body 3 may be divided in the longitudinal direction, that is, in the direction perpendicular to the axis, as shown in FIGS. 2 (e), (f) and (g), in the direction parallel to the axis, In other words, the heat collector 3 may be divided in the longitudinal direction. By forming in a divided manner, it is easy to combine the shape, material, processing method and the like of the heat collecting body 3 including the heat collecting fins 32, which is difficult to adopt by integral molding, and the heat collecting body 3 having a high heat exchange rate The heat exchanger 1 can be manufactured easily and inexpensively.

  And when dividing | segmenting and forming especially in the direction parallel to an axis | shaft, as shown to FIG.2 (e), the heat collection body 3 is the other division bodies 30 with the division body 30 which comprises the heat collection body 3. As shown in FIG. Locking protrusions 37 are provided at the opposing portions to lock the divided bodies 30 together, or as shown in FIGS. 2 (f) and 2 (g), at both ends of the cylindrical portion 31 portion of the divided body 30. Then, an engagement protrusion 38 and an engagement recess 39 are provided in the facing portion between the divided bodies 30 when the heat collector 3 is assembled, and the engagement protrusion 39 is slid in the longitudinal direction of the heat collector 3. It is preferable to form the heat collecting body 3 by inserting 38 and engaging the divided bodies 30 with each other. This is because such a configuration can prevent the divided body 30 from being displaced and the heat collecting body 3 from being disassembled when the heat collecting body 3 is assembled, and the effect is enhanced by engaging the heat collecting body 3 in particular. In addition, the number of divisions is not particularly limited, but if it is too large, the assembly and insertion / removal operations to and from the heat exchange tube 2 may become complicated. About 4 divisions are preferable, and 2 or 3 divisions are particularly preferable.

  When the heat collecting body 3 is formed by combining a plurality of divided bodies 30, the shapes of the heat collecting fins 32 formed on the respective divided bodies 30 and the molding positions may be different, and the shapes of the divided bodies 30 may be different shapes. However, it is preferable that the respective divided bodies 30 have the same shape. By having the same shape, it is not necessary to assemble with attention to the relative positional relationship between the respective divided bodies 30, the assembly of the heat collector 3 is facilitated, and the division body 30 and the heat collector 3 are manufactured. This is because it can be easily and inexpensively. For example, when the heat collecting body 300 shown in FIG. 2 (g) is formed by three divided bodies 30, three divided bodies 301 having a cross-sectional shape shown in FIG. 4 can be assembled and assembled. A heat collector 300 shown in FIG. 5 is formed as one form of the heat collector 3. Furthermore, the heat exchanger 1 shown in FIG. 6 is formed as an embodiment of a heat exchanger using the heat collector 300.

  The heat exchanger 1 as described above can be used for various devices such as a heating device that requires heat exchange, and examples of the heating device include a fryer that heats oil and a rice noodle device that heats water. A liquid heating apparatus is mentioned. Hereinafter, an embodiment in which the heat exchanger 1 is used as a heating device will be described using a rice noodle device as an example.

  As shown in FIG. 7 to FIG. 9, the bowl noodle device 10 is a liquid tank for storing water for boiling noodles above the inside of the main body 6 having legs 61 for installation on the floor surface of a kitchen or the like. Combustion in which a gas burner 63 as a heat generating device is installed inside the main body 6 on the front surface 621 side (left side in FIG. 8) of the liquid tank 62 in contact with the outer wall surface of the liquid tank 62. A chamber 64 is provided. Specifically, the combustion chamber 64 is configured such that a box body 88 having an upper and lower opening is in close contact with an upper wall surface of the liquid tank 62 and a part of the outer wall surface of the liquid tank 62 is an upper wall. An exhaust path 65 is provided on the back surface 622 side (right side in FIG. 8) of the liquid tank 62. In the liquid tank 62, a predetermined number of heat exchangers 1 are connected at one end to the combustion chamber 64 and at the other end to the exhaust path 65, and extend from the opposite surface of the liquid tank 62, that is, from the front surface 621 to the back surface 622. It is installed almost horizontally. In this way, a flow path 69 that leads from the combustion chamber 64 to the heat exchanger 1 and the exhaust path 65 is formed.

  The heat exchanger 1 is installed by welding the end of the heat exchange pipe 2 of the heat exchanger 1 to the holes 66 provided in the front surface 621 and the back surface 622 of the liquid tank 62, respectively. May be installed in the heat exchange pipe 2 in advance, or may be inserted into the heat exchange pipe 2 after the heat exchange pipe 2 is fixed to the liquid tank 62.

  Next, the operation of the rice noodle device 10 will be described. After storing the water 7 in the liquid tank 62 to a level higher than that of the heat exchanger 1, the gas burner 63 is ignited to generate high-temperature combustion gas in the combustion chamber 64. The flow of the combustion gas ascends as shown by an arrow R in FIG. 8 and enters the heat exchanger 1, and enters the inside of the heat collector 3, that is, the inside of the cylindrical portion 31, or in addition, the concave portion 41. It enters the space 5 between the heat exchange tube 2 and the heat collector 3 formed by the above, and comes into contact with the tubular portion 31 and the heat collection fins 32. The heat of the combustion gas is absorbed by the cylindrical portion 31 and the heat collecting fins 32, and the heat collected by the heat collecting fins 32 is transmitted to the cylindrical portion 31 and further transmitted to the heat exchange pipe 2. The heat transferred to the heat exchange pipe 2 reaches the outer surface of the heat exchange pipe 2 in contact with the water 7 in the liquid tank 62 and exchanges heat with the water 7 in the liquid tank 62, that is, heats the water 7. The combustion gas deprived of heat inside the heat exchanger 1 is discharged to the outside of the main body 6 through the exhaust passage 65.

  When the heat collector 3 is removed from the heat exchange pipe 2 for maintenance of the heat exchanger 1 or when the heat collector 3 is inserted into the heat exchange pipe 2 at the end of the maintenance, the combustion chamber 64 is configured. This can be done by removing or opening the box 88 which can be attached or detached or opened and closed and the front lid 81 which is provided on the front surface of the main body 6 so as to be attached or detached.

  The heat collecting fins 32 have the shape shown in FIG. 2G and are formed in the shape shown in FIG. 5 by combining three divided bodies 301 shown in FIG. 4 and the same in the longitudinal direction of the cylindrical portion. The rise time and thermal efficiency of a bowl noodle device in which two heat exchangers using the heat collector 300 having a cross-sectional shape were installed were measured. The noodle machine uses TU-50N manufactured by TANIKO CO., LTD. Used an Al6063 formed with an inner diameter of 68.2 mm, an outer diameter of 74.2 mm, and a length of 250 mm. The fixed room temperature was 5.8 ° C., 36 liters of 10.2 ° C. water was stored in the liquid tank, and pure propane gas was used.

  The rise time from 10.2 ° C. to 98 ° C. was 36 minutes, and the thermal efficiency was 62%. The rise time from 30 ° C. to 98 ° C. was 19 minutes and 10 seconds, and the thermal efficiency was 66.7%. Thus, both rise time and thermal efficiency were good.

  The heat exchanger 1 of the present invention can be used for various devices such as a heating device that requires heat exchange, and is particularly suitable for a liquid heating device such as a fryer that heats oil or a rice noodle device that heats water. Can be used.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 10 Crab noodle device 2 Heat exchange pipe 3 Heat collection body 30 Divided body which comprises heat collection body 300 Heat collection body 301 Division body which comprises heat collection body 31 Cylindrical part 32 Heat collection fin 325 Auxiliary fin 37 Locking projection 38 Engaging projection 39 Engaging recess 41 Recessing 6 Main body 62 Liquid tank 63 Gas burner 64 Combustion chamber 65 Exhaust passage 69 Channel 7 Water H Height of heat collecting fin W Thickness of heat collecting fin

Claims (15)

  A heat exchanger for transferring heat inside the heat exchanger to a heated body outside the heat exchanger, comprising a cylindrical heat exchange pipe having both ends opened and a heat collector installed inside the heat exchange pipe The heat collector includes a tubular portion and a heat collecting fin that is integrally formed with the tubular portion and extends from the inner wall surface of the tubular portion to the inside of the tubular portion. When the heat collector is heated and expanded, the heat exchanger tube and the heat collector are in a state of tight fit.   The outer peripheral surface of the cylindrical portion of the heat collector is formed with a concave portion that extends in the longitudinal direction of the cylindrical portion and protrudes inward of the cylindrical portion. The heat exchanger according to 1.   The heat exchange according to claim 1 or 2, wherein the heat exchange tube and the heat collector are in a state of tight fit before the heat exchange tube and the heat collector are heated. vessel.   The heat exchange according to claim 1 or 2, wherein the heat exchange tube and the heat collector are in a loose fit state before the heat exchange tube and the heat collector are heated. vessel.   The heat exchanger according to any one of claims 1 to 4, wherein the heat collector is divided into a direction parallel to an axis of the heat collector.   The heat exchanger according to any one of claims 1 to 4, wherein the heat collector is divided in a direction perpendicular to an axis of the heat collector.   The heat exchanger according to claim 5 or 6, wherein the heat collector is formed by combining a plurality of divided bodies having the same shape.   The said heat collection body is provided with the heat collection fin in which at least one part was curved in the cross sectional view of the orthogonal | vertical direction with respect to the axial direction of the said heat collection body. The heat exchanger as described in.   The heat exchanger according to any one of claims 1 to 8, wherein the heat collector is made of an aluminum alloy or pure aluminum, and the heat exchange tube is made of stainless steel.   The heat exchanger according to claim 9, wherein the surface of the heat collector is anodized.   A heat exchanger manufacturing method for transferring heat inside a heat exchanger to an object to be heated outside the heat exchanger, wherein a cylindrical heat exchange pipe having both ends opened is formed, while a cylindrical portion and the cylinder A heat collecting body provided with heat collecting fins extending from the inner wall surface of the tubular portion to the inside of the tubular portion, and inserting the heat collecting body into the heat exchange tube, The heat exchanger manufacturing method characterized by installing in a state.   The heating apparatus using the heat exchanger of any one of the said Claims 1-10.   The said heating apparatus is provided with a liquid tank above the inside of the main body, and the said heat exchanger is a liquid heating apparatus installed over the opposing surface of the said liquid tank. Heating device.   The heating device according to claim 13, wherein the liquid heating device is a crab noodle device.   The heating device according to claim 13, wherein the liquid heating device is a fryer.

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