JP6435487B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger, and more particularly, to a heat exchanger having a plurality of heat exchange tubes formed as flat hollow tubes.

  Conventionally, a heat exchanger of this type has been proposed that includes a plurality of tubes that circulate refrigerant between an inlet tank and an outlet tank of the refrigerant and exchange heat with the outside air (see, for example, Patent Document 1). In this heat exchanger, the refrigerant flowing into the inlet tank is cooled by exchanging heat between the plurality of tubes and the outside air passing between the tubes substantially vertically while passing through the plurality of tubes and reaching the outlet tank. And in order to improve heat exchange efficiency, the cooling fin is attached between several tubes.

  Moreover, what collect | recovers the latent heat of waste gas by heat exchange with the waste heat recovery medium taken out from the hot water storage tank and the waste gas exhausted from the engine is proposed (for example, refer patent document 2). In this heat exchanger, the exhaust heat flows so as to face the low-temperature exhaust heat recovery medium taken out from the bottom of the hot water storage tank, and the exhaust heat recovery medium after the heat exchange is returned to the upper part of the hot water storage tank to recover the exhaust heat. Improving efficiency.

Japanese Patent Laid-Open No. 2001-167782 JP 2011-7192 A

  In heat exchangers made by laminating a plurality of flat heat exchange tubes, improvement in heat exchange efficiency is desired due to the need for miniaturization and weight reduction, and the thickness of the metal plate material forming the heat exchange tubes is reduced. Thinning is desired. However, when the thickness of the metal plate material forming the heat exchange tube is reduced, the heat exchange tube may be deformed by the pressure acting on the heat exchange medium flowing in the heat exchange tube.

  The main purpose of the heat exchanger of the present invention is to suppress deformation of the heat exchange tube.

  The heat exchanger of the present invention employs the following means in order to achieve the main object described above.

The heat exchanger of the present invention is
A plurality of heat exchange tubes formed as flat hollow tubes are stacked, and between a first heat exchange medium flowing in the heat exchange tube and a second heat exchange medium flowing between adjacent heat exchange tubes. A heat exchanger for exchanging heat at
The flat surfaces on both sides of the heat exchange tube are formed with a plurality of wavy irregularities in which a top line with a continuous top part and a bottom line with a continuous bottom part are formed by connecting one or more V-shaped laterally in a horizontal direction. And
In the plurality of wavy irregularities formed by pressing a single plate material made of metal and arranged inside the heat exchange tube, and formed inside the one flat surface of the heat exchange tube A plurality of one-side joints joined to the one convex part on the inside, and the other convex part on the inside of the plurality of wavy irregularities formed on the inner side of the other flat surface of the heat exchange tube An inner fin having a plurality of other side joining parts joined to the part,
It is characterized by that.

  In the heat exchanger according to the present invention, the flat surfaces on both sides of the heat exchange tube have a plurality of shapes in which a top line with a continuous top part and a bottom line with a continuous bottom part are formed by connecting one or more V-shaped laterally. Wavy irregularities are formed on substantially the entire surface. The second heat exchange medium that flows between the adjacent heat exchange tubes has a heat that overcomes the V shape that is different from the main flow when the V shape of the top line formed on the surface of the heat exchange tube is overcome. A secondary flow effective for exchange occurs. For this reason, heat exchange efficiency can be improved compared with the thing in which these several wavelike unevenness | corrugations are not formed. In addition, since the plurality of wavy irregularities increases the rigidity against bending and twisting of the flat surface, the thickness of the heat exchange tube can be reduced. Further, the heat exchanger of the present invention includes an inner fin that is formed by pressing a single metal plate and is disposed inside the heat exchange tube. The inner fin includes a plurality of one-side joint portions joined to one convex portion on the inside of a plurality of wavy irregularities formed on the inner side of one flat surface of the heat exchange tube, and a heat exchange tube And a plurality of other side joint portions joined to the other convex portion on the inner side of the plurality of wavy irregularities formed on the inner side of the tube of the other flat surface. Such an inner fin can suppress the deformation of the heat exchange tube with respect to the pressure acting in the heat exchange tube due to the tensile stress and the compressive stress between the one side joint and the other side joint, The plate thickness of the heat exchange tube can be reduced. As a result, the heat exchanger can be reduced in size and weight. Moreover, since the inner fin is formed by pressing a single metal plate, it can be processed relatively easily. In addition, the joining of the heat exchange tube and the joining of one side of the inner fin and the joint of the other side are carried out by brazing or the like, but in order to improve the assemblability, the brazing material is clad on the base material. It is preferable to form a heat exchange tube or an inner fin using the clad material.

  In such a heat exchanger according to the present invention, the inner fin has a shape in which one or more V-shapes are continuously connected in a lateral direction with a top line having a continuous top part and a bottom line having a continuous bottom part, and the other side convex part and the other side. A plurality of wavy irregularities having an amplitude with respect to the side protrusions may be formed on substantially the entire surface. If it carries out like this, the contact part of several wavy unevenness | corrugation formed in the inner fin and several wavy unevenness | corrugation formed in the flat surface of the both sides of the heat exchange tube will function as a 1st side junction part or the other side junction part.

  In the heat exchanger of the present invention having an inner fin in which the plurality of wavy irregularities are formed, the plurality of wavy irregularities formed on the inner fin are a plurality of flat surfaces of the heat exchange tube. The wavy irregularities may be formed to have the same wavelength, the same V shape, and at least one of the phase of the wavelength or the repeated phase of the V shape. If it carries out like this, many intersections of several wavy unevenness | corrugation of an inner fin and several wavy unevenness | corrugation formed in the flat surface of the both sides of the tube for heat exchange can be comprised. In this case, the plurality of wavy unevenness formed on the inner fin is different from the plurality of wavy unevenness formed on the flat surface of the heat exchanging tube by the phase of the wavelength being different by π and repeating the V shape. It can also be formed so that the phases are different by π. In this way, the intersection of the V-shape of the convex portion on one side of the heat exchange tube and the V-shape of the convex portion of the inner fin and the bending point of the V-shape serve as one side joint, and the convex portion on the other side of the heat exchange tube. The intersection of the V-shape of the portion and the V-shape of the recess of the inner fin and the bending point of the V-shape can be used as the other side joint, and the one side joint and the other side joint are arranged geometrically and evenly can do. As a result, it is possible to suppress deformation of the heat exchange tube with respect to the pressure acting in the heat exchange tube.

  Further, in the heat exchanger of the present invention having an inner fin in which a plurality of wavy irregularities are formed, the plurality of wavy irregularities formed in the inner fin are a plurality formed on a flat surface of the heat exchange tube. Are formed in such a manner that they have the same wavelength, the same width and a slightly longer V shape, the wavelength phase is different by π, and the V-shaped repeated phase is different by π. It can also be. In this case as well, as described above, the intersection of the V-shape of the convex portion on one side of the tube for heat exchange and the V-shape of the convex portion of the inner fin and the bent point of the V-shape are used as one-side joint portions, The intersection of the V-shape of the other-side convex portion of the replacement tube and the V-shape of the concave portion of the inner fin and the V-shaped bending point can be used as the other-side joint portion. In addition, since the plurality of wavy irregularities of the inner fin are V-shaped with the same width and slightly longer in the vertical direction than the V-shaped of the plurality of wavy irregularities of the heat exchange tube, manufacturing errors and slight positioning during assembly Even if the shortage occurs, the V-shaped bending point can be reliably set as the one-side joint or the other-side joint.

  In the heat exchanger according to the present invention, the inner fin may be an offset fin formed so that a height is an interval between the one-side convex portion and the other-side convex portion. By so doing, the flat surface formed on the one side convex portion side of the offset fin contacts the one side convex portion to constitute one side joint portion, and the flat surface formed on the other side convex portion side of the offset fin Abutment with the other side convex portion constitutes the other side joint portion. In this case, the inner fin includes the first unevenness in which the first top flat surface in contact with the one convex portion and the first bottom flat surface in contact with the other convex portion are alternately arranged in a straight line and the one The second unevenness in which the second top flat surface in contact with the side convex portion and the second bottom flat surface in contact with the other convex portion are alternately arranged on a straight line alternately, and the second unevenness is The first unevenness is formed so as to be shifted by a quarter wavelength, and the first top flat surface and the first bottom flat surface in the first unevenness have a linear length and the first The length in the linear direction of the second top flat surface and the second bottom flat surface in the two concavo-convex portions may be formed so as to coincide with the V-shaped repetition width. In this way, the first top flat surface, the first bottom flat surface, the second top flat surface, and the second bottom flat surface are convex on one side convex inward in the wavy unevenness formed on both flat surfaces of the heat exchange tube. The one-side joint portion and the other-side joint portion can be configured by abutting against adjacent V-shaped bent portions where the top portions of the portions and the other-side convex portions are continuous. As a result, it is possible to satisfactorily suppress the deformation of the heat exchange tube against the pressure acting on the heat exchange tube.

  In the heat exchanger according to the aspect of the invention, the inner fin includes a first flat surface that contacts the first convex portion, a second flat surface that contacts the second convex portion, the first flat surface, and the second flat surface. It is also possible to have a plurality of support slopes that support symmetrically and obliquely. If it carries out like this, one side convex part will contact | abut to one side plane, and will comprise a V-shaped one side junction part, and the other side junction part will contact | abut to the other side plane, and will comprise the V-shaped other side junction part. In this case, it is preferable to configure the heat exchanger such that the first heat exchange medium and the second heat exchange medium are in a cross flow. That is, the second heat exchange medium between the adjacent heat exchange tubes is made to flow over a plurality of wavy irregularities formed on the flat surfaces on both sides of the heat exchange tube, The first heat exchange medium is made to flow in a zigzag manner along a plurality of wavy irregularities formed on the flat surfaces on both sides of the heat exchange tube. In the heat exchanger according to the aspect of the present invention, the inner fin has a plurality of flat surfaces at the top of the offset fin so that the flat surfaces at the upper side of the offset fin are continuous with the one side plane, and a plurality of flat surfaces at the bottom of the offset fin are It can also be formed by processing the offset fins so as to be continuously the other side plane. In this way, the inner fin can be easily formed.

  In the heat exchanger according to the present invention, the inner fin may have a through hole or a cut-and-raised portion formed between the one side joint and the other side joint. If it carries out like this, the distribution | circulation of a 1st heat exchange medium can be made favorable.

It is explanatory drawing which shows the outline of a structure of the heat exchanger 20 as one Example of this invention. It is a side view which shows the external appearance of the several tube 30 for heat exchange used for the heat exchanger 20 of an Example from the side. It is explanatory drawing for demonstrating the structure of the tube 30 for heat exchange. It is explanatory drawing explaining the AA cross section of the tube 30 for heat exchange of FIG. It is explanatory drawing explaining the BB cross section of the tube 30 for heat exchange of FIG. It is explanatory drawing which shows the bottom line 34b of the wavy unevenness | corrugation 34 in the flat surface of the one side of the tube 30 for heat exchange. 4 is an explanatory view showing a top line 44a of a wave-like unevenness 44 of the inner fin 40. FIG. It is explanatory drawing which shows the one side junction part 46a obtained by superimposing FIG. 7 on FIG. It is explanatory drawing explaining the top line 144a of the wavy unevenness | corrugation 144 of the inner fin 140 of a modification. It is explanatory drawing for demonstrating the structure of the inner fin 240 of a modification. It is explanatory drawing which shows the top line 344a in the wavy unevenness | corrugation 344 of the inner fin 340 of a modification. It is explanatory drawing which shows the one side junction part 346a obtained by superimposing FIG. 11 on FIG. It is a partial external view which shows a part of external appearance of the inner fin 440 of a modification. It is sectional drawing which shows the cross section of the tube for heat exchange using the inner fin 440 of the modification. It is sectional drawing which shows the cross section of the tube for heat exchange using the inner fin 540 of the modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is an explanatory view showing an outline of the configuration of a heat exchanger 20 as one embodiment of the present invention, and FIG. 2 shows the appearance of a plurality of heat exchange tubes 30 used in the heat exchanger 20 of the embodiment from the side. FIG. As shown in the drawing, the heat exchanger 20 of the embodiment includes a plurality of heat exchange tubes 30 arranged in parallel so that the longitudinal direction is the vertical direction, and a shell 50 that houses the plurality of heat exchange tubes 30. .

  Each heat exchange tube 30 is formed by pressing so as to be a flat hollow tube having a substantially rectangular shape as a whole using a plate material made of a metal material (for example, stainless steel or aluminum), and the longitudinal direction is the vertical direction. The contact points are joined by brazing. The inlet 31 formed in the vicinity of the lower end in the vertical direction of each heat exchange tube 30 is joined to the inlet 31 of the adjacent heat exchange tube 30 by stacking the heat exchange tubes 30. A communication pipe 31 a communicating with 31 is formed. Further, the outlet 32 formed in the vicinity of the upper upper end of each heat exchanging tube 30 is similar to the inflow port 31 by stacking the respective heat exchanging tubes 30 to allow the flow of the adjacent heat exchanging tubes 30 to flow. A connecting pipe 32 a that is joined to the outlet 32 and communicates with each outlet 32 is formed. Therefore, the first heat exchange medium such as water or oil flows in from the inlet 31 of each heat exchange tube 30, flows vertically upward, and flows out from the outlet 32 of each heat exchange tube 30.

  Similarly to each heat exchange tube 30, the shell 50 is a substantially rectangular parallelepiped shape that houses a plurality of heat exchange tubes 30 connected by connecting pipes 31 a and 32 a by a plate material made of a metal material (for example, stainless steel or aluminum). It is formed as a case. An inflow port 51 is formed above the shell 50, and an outflow port 52 is formed below the shell 50. Therefore, the second heat exchange medium such as air or exhaust gas flows from the inlet 51 formed above the shell 50, passes between the plurality of heat exchange tubes 30, and flows below the shell 50. It flows out from the outlet 52.

  On both flat surfaces of each heat exchange tube 30, a plurality of wavy irregularities 34 and 36 are formed by smooth curved surfaces. In FIG. 1, the wavy unevenness 34 of the flat surface 33 on one side of both flat surfaces of the heat exchange tube 30 is shown, and the wavy unevenness 36 of the flat surface 35 on the other side of both flat surfaces is parenthesized. It was written. The wavy irregularities 34 and 36 are formed in such a manner that the top lines 34a and 36a in which the tops of the waves indicated by a plurality of solid lines are continuous and the bottom lines 34b and 36b in which the bottoms indicated by a plurality of broken lines are alternately arranged in a horizontal direction. It is formed so that it may be connected to the shape. Here, the top of the wave means the position of 90 degrees when the convex part and the concave part of the wave are indicated by a sine wave, that is, the position of the maximum value (the top of the convex part). , It means a position of 270 degrees when the wave convex part and the concave part are indicated by a sine wave, that is, the position of the minimum value (the bottom of the concave part). As described above, the wavy irregularities 34 and 36 are formed on both flat surfaces of each heat exchange tube 30 when the second heat exchange medium is flowed in addition to the main flow of the second heat exchange medium. This is because a secondary flow effective for exchange is generated. In the heat exchanging tube 30 of the embodiment, the wavy unevenness 34 on one side of the flat surfaces and the wavy unevenness 36 on the other flat surface are parallel to each other, that is, on one side. The top line 34a of the wavy unevenness 34 of the flat surface and the bottom line 36b of the wavy unevenness 36 of the other flat surface are aligned, and the bottom line 34b of the wavy unevenness 34 of the one flat surface and the wavy shape of the other flat surface It arrange | positions so that the top line 36a of the unevenness | corrugation 36 may align. When viewed from the inside of the heat exchange tube 30, the bottom line 34 b of the wavy unevenness 34 of the flat surface 33 on one side is a line in which the top of the convex portion on the one side is continuous, and the flat surface 35 on the other side. The bottom line 36b of the wavy uneven 36 is a line in which the top of the other convex part on the inside is continuous.

  In the heat exchanging tube 30 of the embodiment, the inner fin 40 in which the wave-like unevenness 44 similar to the wave-like unevenness 34, 36 formed on the both flat surfaces 33, 35 is formed is disposed inside. The inner fin 40 is formed by pressing a plate material made of a metal material. The wavy unevenness 44 of the inner fin 40 has a wavy unevenness of the top of one convex portion and the flat surface 35 of the other side, the amplitude of which is represented by the bottom line 34 b in the wavy unevenness 34 of the flat surface 33 on one side of the heat exchange tube 30. The same wavelength is applied to the wavy irregularities 34 and 36 formed on both flat surfaces 33 and 35 of the heat exchanging tube 30 so as to coincide with the distance from the top of the other convex portion represented by the bottom line 36b in 36. Thus, the top line 44a and the bottom line 44b have the same V shape, and the phase of the wavelength differs by π (half wavelength) from the wavy unevenness 34 of the flat surface 33 on one side, and the V shape is repeated. Are different from each other by π (half of the V shape). FIG. 3 is an explanatory diagram for explaining the configuration of the heat exchange tube 30, FIG. 4 is an explanatory diagram for explaining a cross section AA of the heat exchange tube 30 of FIG. 3, and FIG. It is explanatory drawing explaining the BB cross section of the tube 30 for heat exchange of 3. FIG. In FIG. 3, the thick solid line indicates the bottom line 34 b of the wavy unevenness 34 on the flat surface 33 on one side (a line in which the top of the one convex portion continues), and the thick broken line indicates the wavy unevenness 36 on the flat surface 35 on the other side. A bottom line 36b (a line in which the top of the convex part on the other side is continuous) is shown, a thin alternate long and short dash line indicates a top line 44a of the wavy unevenness 44 of the inner fin 40, and a thin alternate long and two short dashes line indicates the bottom of the wavy unevenness 44 of the inner fin 40 Line 44b is shown. 4 and 5, the thick solid line indicates the wavy unevenness 34 on the flat surface 33 on one side, the thick broken line indicates the wavy unevenness 36 on the flat surface 35 on the other side, and the thin solid line indicates the wavy unevenness 44 of the inner fin 40. Show.

  In the inner fin 40, a contact point where the top line 44 a of the waved unevenness 44 contacts the bottom line 34 b of the waved unevenness 34 on the flat surface 33 on one side is bonded as the one-side bonded part 46 a, and the bottom of the waved unevenness 44 A contact point where the line 44b and the bottom line 36b of the wavy unevenness 36 in the flat surface 35 on the other side come into contact is joined as the other side joint 46b. These joints are performed by brazing. 3 to 5, the one-side joint 46a is indicated by a black circle, and the other-side joint 46b is indicated by a black square. 6 is an explanatory view showing the bottom line 34b of the wavy unevenness 34 on the flat surface 33 on one side, FIG. 7 is an explanatory view showing the top line 44a of the wavy unevenness 44 of the inner fin 40, and FIG. 8 is an explanatory view showing a one-side joint 46a obtained by superimposing FIG. As shown in FIGS. 6 to 8, the one-side joint 46 a includes a top line 44 a of the wavy unevenness 44 of the inner fin 40 and a bottom line 34 b of the wavy unevenness 34 on the flat surface 33 on one side of the heat exchange tube 30. And the bent portion of the top line 44a of the wavy unevenness 44 of the inner fin 40 (the bent portion of the bottom line 34b of the wavy unevenness 34 in the flat surface 33 on one side), and is geometrically evenly arranged. Has been. Similarly, the other side joint portion 46b has an intersection between the bottom line 44b of the wavy unevenness 44 of the inner fin 40 and the bottom line 36b of the wavy unevenness 36 on the flat surface 35 on the other side of the heat exchange tube 30, and the inner fin 40. It is formed in a bent portion of the bottom line 44b of the wavy unevenness 44 (a bent portion of the bottom line 36b of the wavy unevenness 36 in the flat surface 35 on the other side), and is geometrically evenly arranged together with the plurality of one-side joint portions 46a. Has been. Therefore, the first heat exchange medium flowing in from the inlet 31 of the heat exchange tube 30 is between the flat surface 33 on one side and the flat surface 35 on the other side of the heat exchange tube 30 by the inner fin 40. And flow vertically upward, merge and flow out from the outlet 32 of the heat exchange tube 30.

  In the heat exchanger 20 of the embodiment, both the flat surfaces 33 and 35 of the heat exchange tube 30 and the inner fin 40 are formed of a clad plate material clad with a brazing material, and the heat exchange tube in a state where the inner fin 40 is inserted. 30 are laminated so that the adjacent heat exchange tubes 30, the inlet 31 and the outlet 32 are aligned, and this laminated body is placed in a furnace that is heated to a temperature at which the brazing material melts, and brazed to form a laminated body. The laminated body is assembled by placing it on a shell 50 formed separately.

  Consider a case where pressure is applied to the first heat exchange medium flowing inside the heat exchange tube 30 with respect to the heat exchanger 20 configured in this manner. At this time, the pressure in the heat exchanging tube 30 as a whole acts to inflate both flat surfaces 33 and 35 forming the outer wall of the heat exchanging tube 30, but the both flat surfaces 33 of the heat exchanging tube 30. , 35 are joined to the inner fin 40 by the one-side joined portion 46a and the other-side joined portion 46b, a tensile stress acts between the one-side joined portion 46a and the other-side joined portion 46b of the inner fin 40, The deformation of both flat surfaces 33 and 35 is suppressed.

  According to the heat exchanger 20 of the embodiment described above, the wavy irregularities 34 and 36 having a shape in which V-shapes are connected in the lateral direction are formed on both flat surfaces 33 and 35 constituting the outer wall of the heat exchange tube 30. The interval between the wavy irregularities 34 and 36 of the heat exchanging tube 30 is an amplitude, the same wavelength, the same V shape, the same V shape, and the phase of the wavelength is π (half). The inner fin 40 is formed with the wave-like irregularities 44 that are different by the wavelength) and the phase of the V-shaped repetition is different by π (half the V-shape), and both the wave-like irregularities 44 of the inner fin 40 and the heat exchange tube 30 are arranged. By joining the abutting portions of the flat surfaces 33 and 35 with the wave-like irregularities 34 and 36 to form the one-side joining portion 46a and the other-side joining portion 46b, heat is applied to the pressure acting in the heat exchange tube 30. Replacement tube The deformation of the probe 30 can be suppressed. As a result, the thickness of both flat surfaces 33 and 35 forming the heat exchange tube 30 can be reduced, and the heat exchanger 20 can be reduced in size and weight. Moreover, since the V-shaped corrugations 34 and 36 are formed on both flat surfaces 33 and 35 constituting the outer wall of the heat exchange tube 30, the second heat exchange medium that flows between the adjacent heat exchange tubes 30 is mainly used. In addition to a simple flow, a secondary flow effective for heat exchange can be generated. As a result, the heat exchange efficiency can be increased, and the heat exchanger 20 can be reduced in size and weight. Moreover, since both the flat surfaces 33 and 35 of the heat exchange tube 30 and the inner fin 40 are formed of a clad plate material, the laminate of the heat exchange tubes 30 can be easily configured with high accuracy.

  In the heat exchanger 20 of the embodiment, the wavy irregularities 44 of the inner fin 40 are made to have a top line 44 a and a bottom line 44 b with respect to the wavy irregularities 34 and 36 formed on both flat surfaces 33 and 35 of the heat exchange tube 30. Are formed to have the same V shape, but the vertical length of the V shape formed by the top line 44a and the bottom line 44b is formed on both flat surfaces of the heat exchanging tube 30. It is good also as what forms so that it may become a little longer. FIG. 9 is an explanatory view illustrating the top line 144a of the wavy unevenness 144 of the inner fin 140 according to a modification. In the drawing, the solid line indicates the top line 144a of the wavy unevenness 144 of the modified inner fin 140, and the alternate long and short dash line indicates the top line 44a of the wavy unevenness 44 of the inner fin 40 of the embodiment. The top line 144a of the wavy unevenness 144 in the inner fin 140 of the modification is formed so that the length in the vertical direction of the V-shape is slightly longer. Therefore, the bending point of the top line 144a is slightly higher in the vertical direction than in the embodiment. It protrudes by the amount. In the embodiment, as shown in FIG. 8, the bent portion of the top line 44 a of the wavy unevenness 44 of the inner fin 40 and the bent portion of the bottom line 34 b of the wavy unevenness 34 on the flat surface on one side of the heat exchange tube 30 are defined. Although contact is made at one point, when the inner fin 140 of the modified example is used instead of the inner fin 40 of the embodiment, the bending point of the top line 144a protrudes up and down as compared with the embodiment, so The contact with the bent part of the line 34b occurs at the intersection of two points if strictly understood. Considering that a certain bonding area can be obtained by brazing, by using the modified inner fin 140, the bonding area of the bent portion of the bottom line 34b is larger in the modified example than in the embodiment. Therefore, it is possible to increase the bonding strength at the bent portions of the bottom lines 34b and 36b. Further, when the modified inner fin 140 is used, even if the position of the inner fin 140 in the heat exchange tube is slightly shifted up and down during assembly, the bent portion of the top wire 144a and the bent portion of the bottom wire 144b of the wavy unevenness 144 Is aligned with the bent portion of the bottom line 34b and the bent portion of the bottom line 36b, so that the bent portions of the bottom lines 34b and 36b can be more reliably joined.

  In the heat exchanger 20 of the embodiment, the wavy unevenness 44 is formed on the inner fin 40, but a through hole may be formed on the inner fin, or a cut and raised portion may be formed. FIG. 10 is an explanatory diagram for explaining an example of a configuration of a modified inner fin 240. In the figure, a thick solid line is a bottom line 34b of the wavy unevenness 34 on the flat surface 33 on one side of the heat exchanging tube 30 (a line in which the top of one convex part is continuous), and a thick broken line is the heat exchanging tube 30. The bottom line 36b of the wavy unevenness 36 on the other flat surface 35 (the line where the top of the other convex part continues), and the thin alternate long and short dash line indicates the top line 244a of the wavy unevenness 244 in the modified inner fin 240, A thin two-dot chain line indicates a bottom line 244b of the wavy unevenness 244 in the inner fin 240 of the modified example. Moreover, a black circle mark shows the one side joining part 46a, and a black square mark shows the other side joining part 46b. Triangular cut-and-raised parts 248a and 248b are formed between the one-side joint part 46a and the other-side joint part 46b on the vertical line of the inner fin 240 of the modified example. The cut-and-raised 248a is arranged between the two joint portions 46a and 46b in the order of the one-side joint portion 46a and the other-side joint portion 46b from the vertically lower side to the upper side, and is cut and raised on the surface side of the paper surface of FIG. Has been. Further, the cut-and-raised portion 248b is disposed between the two joint portions 46b and 46a in the order of the other-side joint portion 46b and the one-side joint portion 46a from the vertically lower side to the upper side. It has been cut up. As described in the embodiment, since the first heat exchange medium in the heat exchange tube flows from vertically downward to vertically upward, the through holes formed by forming the cuts 248a and 248b can be smoothly formed. It begins to flow. Thus, by forming a through hole or a cut and raised in the inner fin, it is possible to improve the circulation of the first heat exchange medium.

  In the heat exchanger 20 of the embodiment, the wavy unevenness 44 of the inner fin 40 has the same wavelength as that of the wavy unevenness 34, 36 formed on the both flat surfaces 33, 35 of the heat exchange tube 30, and the top line 44a. And the bottom line 44b have the same V shape, and the phase of the wavelength differs by π (half wavelength) with respect to the wavy unevenness 34 of the flat surface 33 on one side, and the phase of the V-shaped repetition is π ( However, the top line 44a of the wavy unevenness 44 of the inner fin 40 and the bottom line 34b of the wavy unevenness 34 on the flat surface 33 on one side of the heat exchange tube 30 (one side) And the bottom line 44b of the wavy unevenness 44 of the inner fin 40 and the bottom line 36b of the wavy unevenness 36 in the flat surface 35 on the other side (the top of the other convexity is The wavy irregularities 44 of the inner fin 40 may have different wavelengths with respect to the wavy irregularities 34 and 36 formed on both flat surfaces 33 and 35 of the heat exchange tube 30. The top line and the bottom line may be formed in different V shapes, or may be formed so that either or both of the wavelength phase and the V-shaped repeated phase are the same or different. FIG. 11 is an explanatory view showing the top line 344a of the wavy unevenness 344 of the modified inner fin 340, and FIG. 12 is an explanatory view showing the one-side joint 346a obtained by superimposing FIG. 11 on FIG. is there. The wavy unevenness 344 of the inner fin 340 of the modified example has the same wavelength as the wavy unevenness 34 of the flat surface 33 on one side of the heat exchange tube 30 so that the top line 44a and the bottom line 44b have the same V shape. In addition, the phase of the wavelength is the same, and the V-shaped repetitive phase is different by π (half of the V-shape). When the inner fin 340 of this modification is used, as shown in FIG. 12, the top line 344 a of the wavy unevenness 344 in the inner fin 340 and the bottom line of the wavy unevenness 34 in the flat surface 33 on one side of the heat exchange tube 30. One side joint 346a is formed at the intersection with 34b (a line where the top of one side convex part is continuous), but the number of the one side joint 346a is inferior to the number and the uniform arrangement as compared with the embodiment. However, it is possible to suppress the heat exchange tube 30 from being deformed with respect to the pressure acting in the heat exchange tube 30 as compared with a case where no inner fin is used.

  In the heat exchanger 20 of the embodiment, the wavy unevenness 44 is formed on the inner fin 40, but the inner fin may be formed as an offset fin. FIG. 13 is a partial external view showing a part of the external appearance of the modified inner fin 440, and FIG. 14 is a sectional view showing a cross section of a heat exchange tube using the modified inner fin 440. As shown in FIG. As shown in the drawing, the modified inner fin 440 includes a first top flat surface 444a formed so as to contact the flat surface 33 on one side and a first flat surface 35 formed so as to contact the flat surface 35 on the other side. The bottom flat surface 444b is formed so as to contact the first unevenness 444 that repeats linearly, the second top flat surface 445a formed so as to contact the flat surface 33 on one side, and the flat surface 35 on the other side. In addition, second unevenness 445 that repeats on the straight line with the second bottom flat surface 445b is formed so as to be alternately arranged. The second unevenness 445 is arranged so as to be shifted from the first unevenness 444 by a quarter wavelength (half the length of the first top flat surface 444a in the linear direction). Further, the lengths of the first top flat surface 444a and the first bottom flat surface 444b of the first unevenness 444 and the lengths of the second top flat surface 445a and the second bottom flat surface 445b of the second unevenness 445 in the linear direction (left and right in FIG. 14). The length in the direction) is formed so as to coincide with the V-shaped repetitive width of the wavy irregularities 34 and 36 of both flat surfaces 33 and 35. For this reason, the first top flat surface 444a, the first bottom flat surface 444b, the second top flat surface 445a, and the second bottom flat surface 445b are appropriately arranged so that the bottom lines 34b and 36b of the wavy irregularities 34 and 36 are formed. One side joint portion 446a and the other side joint portion 446b are configured in contact with adjacent bent portions of the V shape. FIG. 14 shows this state. Even in the heat exchange tube using the inner fin 440 of such a modification, a tensile stress acts between the one-side joint portion 446a and the other-side joint portion 446b, and deformation of the heat exchange tube can be suppressed.

  FIG. 15 is a cross-sectional view showing a cross section of a heat exchange tube using a modified inner fin 540. In the modified inner fin 540, the first top flat surface 444a and the second top flat surface 445a adjacent to each other are continuously joined by pressing the inner fin 440 illustrated in FIGS. 13 and 14 from the left-right direction in FIG. The side flat surface 544a is formed and the adjacent first bottom flat surface 444b and second bottom flat surface 445b are continuously joined to form the other flat surface 544b. In this case, a vertical wall connecting the first top flat surface 444a and the first bottom flat surface 444b of the first unevenness 444 and the second top flat surface 445a and the second bottom flat surface 445b of the second unevenness 445 in FIG. Are inclined walls that are alternately continuous so as to support the one side plane 544a and the other side plane 544b. Since such a configuration has a truss structure, the rigidity of the heat exchange tube can be greatly increased, and deformation thereof can be further suppressed. However, in this case, if the first heat exchange medium and the second heat exchange medium are opposed, the first heat exchange medium flows only between the one side plane 544a and the other side plane 544b. It is preferable that through holes and cuts are formed in 444a, 444b, 445a, and 445b, and a plurality of through holes and cuts are formed in the one side plane 544a and the other side plane 544b. Moreover, you may comprise a heat exchanger so that a 1st heat exchange medium and a 2nd heat exchange medium may become a crossflow. That is, the second heat exchange medium between the adjacent heat exchange tubes flows over the V-shapes of the plurality of wavy irregularities 34 and 36 formed on the flat surfaces on both sides of the heat exchange tubes, and is used for heat exchange. The first heat exchange medium in the tube is made to flow in a zigzag manner along the V-shapes of the plurality of wavy irregularities 34 and 36 formed on the flat surfaces on both sides of the heat exchange tube.

  In the heat exchanger 20 of the embodiment and its modification, the first heat exchange medium and the second heat exchange medium are made to flow countercurrently, but the first heat exchange medium and the second heat exchange medium are cross-flowed. Alternatively, one or both of the first heat exchange medium and the second heat exchange medium may be bypassed.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the heat exchanger manufacturing industry and the like.

  20 heat exchanger, 30 heat exchange tube, 31 inlet, 32 outlet, 31a, 32a connecting pipe, 33 flat surface on one side, 34, 36 wavy unevenness, 34a top line, 34b bottom line, 35 on the other side Flat surface, 36a Top line, 36b Bottom line, 40, 140, 340, 440, 540 Inner fin, 44, 144, 244, 344 Wavy unevenness, 44a, 144a, 344a Top line, 44b Bottom line, 46a, 346a, 446a One side joint, 46b, 446b The other side joint, 50 shell, 51 inlet, 52 outlet, 248a, 248b cut and raised 444 first unevenness, 444a first top flat surface, 444b first bottom flat surface, 445 Second unevenness, 445a Second top flat surface, 445b Second bottom flat surface, 544a One side plane, 544b The other side plane.

Claims (5)

A plurality of heat exchange tubes formed as flat hollow tubes are stacked, and between a first heat exchange medium flowing in the heat exchange tube and a second heat exchange medium flowing between adjacent heat exchange tubes. A heat exchanger for exchanging heat at
The flat surfaces on both sides of the heat exchange tube are formed with a plurality of wavy irregularities in which a top line with a continuous top part and a bottom line with a continuous bottom part are formed by connecting one or more V-shaped laterally in a horizontal direction. And
In the plurality of wavy irregularities formed by pressing a single plate material made of metal and arranged inside the heat exchange tube, and formed inside the one flat surface of the heat exchange tube A plurality of one-side joints joined to the one convex part on the inside, and the other convex part on the inside of the plurality of wavy irregularities formed on the inner side of the other flat surface of the heat exchange tube An inner fin having a plurality of other side joint parts joined to the part ,
The inner fin has a shape in which a top line having a continuous top part and a bottom line having a continuous bottom part are formed by connecting one or more V-shapes in a lateral direction, and an interval between the one side convex part and the other side convex part is an amplitude. A plurality of wavy irregularities formed on substantially the entire surface,
Heat exchanger. The heat exchanger according to claim 1 ,
The plurality of wavy irregularities formed on the inner fin have the same wavelength, the same V-shape, and the phase or V of the wavelength with respect to the plurality of wavy irregularities formed on the flat surface of the heat exchange tube. Formed so that at least one of the repeating phases of the letter shape is different,
Heat exchanger. The heat exchanger according to claim 2 ,
The plurality of wavy irregularities formed on the inner fin are different in wavelength phase by π and have a V-shaped repetitive phase of π with respect to the plurality of wavy irregularities formed on the flat surface of the heat exchange tube. Are only formed differently,
Heat exchanger. The heat exchanger according to claim 1 ,
The plurality of wavy irregularities formed on the inner fin are V-shaped with the same wavelength, the same width and slightly longer in the vertical direction than the plurality of wavy irregularities formed on the flat surface of the heat exchange tube. And the phase of the wavelength is different by π and the phase of the V-shaped repetition is different by π.
Heat exchanger. A heat exchanger according to any one of claims 1 to 4 , wherein
The inner fin has a through-hole or cut-and-raised between the one-side joint and the other-side joint.
Heat exchanger.

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