JP2006038304A5 - - Google Patents

Description

Fin for fluid agitation, method for producing the same, heat transfer tube and heat exchanger or heat exchange type gas cooling device with the fin installed therein

  The present invention relates to a fin structure for fluid agitation in a heat exchanger, and more specifically, a medium to be cooled that is mounted inside or inside and outside the heat transfer tube in the heat exchange type cooling device and flows inside or outside the heat transfer tube. Alternatively, a fluid agitation plate fin capable of providing excellent heat exchange performance by causing a turbulent or vortex agitating action to a fluid made of a cooling medium and increasing the contact between the heat transfer tube wall surface and the fluid; The present invention relates to a plate fin manufacturing method, a heat transfer tube in which the plate fin is installed, and a heat exchanger or a heat exchange type gas cooling apparatus in which at least one heat transfer tube is provided.

  In recent years, heat exchangers for various forms of fluids such as EGR coolers for automobile exhaust gas recirculation, liquid-liquid, liquid-gas, gas-gas, etc., such as fuel coolers, oil coolers, and intercoolers have been widely used. However, in the heat transfer tubes through which these fluids flow, various devices have been made to efficiently radiate or absorb the heat held by the fluids. For example, a method of taking a part of exhaust gas from an exhaust system of a diesel engine, returning it to the intake system of the engine again, and adding it to the air-fuel mixture is called EGR (Exhaust Gas Recirculation) and is called NOx (nitrogen oxide) ), Reducing pump loss, reducing heat dissipation loss to the coolant due to lowering of combustion gas temperature, increasing specific heat ratio due to working gas volume / composition change, and accompanying improvement in cycle efficiency Therefore, it is widely adopted as an effective method for purifying exhaust gas from diesel engines and improving thermal efficiency.

However, if the temperature of the EGR gas rises and the amount of EGR gas increases, the durability of the EGR valve deteriorates due to its thermal action, and there is a possibility that it will be damaged early. For example, it is necessary to use a structure, and this leads to a phenomenon in which the charging efficiency is lowered and the fuel consumption is lowered as the intake air temperature rises. In order to avoid such a situation, a device for cooling EGR gas with engine coolant, car air-conditioning refrigerant or cooling air is used, and in particular, gas-liquid heat for cooling gas EGR gas with engine coolant. Many exchange-type EGR gas cooling devices have been proposed, and as means for improving the heat exchange performance, various forms of fins are provided in a pipe through which EGR gas flows. For example, a double pipe type in which an outer pipe through which a liquid is passed is disposed outside an inner pipe through which a gas passes, and a metal corrugated plate is inserted as a fin in the inner pipe in an exchanger for exchanging heat between the gas and the liquid. A heat exchanger (see, for example, Patent Document 1), an inner pipe for circulating a medium to be cooled inside, an outer pipe provided so as to surround and surround the outer circumference of the inner pipe, and an inside of the inner pipe A double-pipe heat exchanger (for example, refer to Patent Document 2) composed of a radiating fin having a thermal stress relaxation function, an inner pipe for circulating a medium to be cooled, and an outer periphery of the inner pipe There are a double-pipe heat exchanger (see, for example, Patent Document 3) composed of an outer tube provided so as to surround and be separated, and a cross fin disposed inside the inner tube.
Japanese Patent Laid-Open No. 11-23181 (pages 1-6, FIGS. 1-2) JP 2000-1111277 A (pages 1 to 12, FIGS. 1 to 12) JP 2003-21478 A (pages 1-8, FIGS. 1-7)

  In each of the above prior arts, in the case of the double-tube type EGR gas cooler disclosed in Patent Documents 1 to 3, the corrugated fins and the cross fins are provided so as to trickle the gas flow and make contact with the fins. In terms of increasing the area, although some results are expected, the inner surface of the pipe constituting the EGR gas flow path has a smooth inner peripheral surface over the entire length. In many cases, the heat transfer near the center of the pipe becomes insufficient, and the gas flow flows straight along the EGR gas pipe, so that the turbulence of the gas flow becomes insufficient and the boundary layer of the heat transfer surface is sufficient. There was a problem that the heat transfer performance was slightly insufficient without being thinned.

  Furthermore, in various heat transfer tubes mounted on other heat exchange type cooling devices including the EGR gas cooling device, as shown in FIGS. 16 (a) to 16 (d). A number of fin structures have been proposed for the purpose of further improving the heat exchange efficiency by agitating the fluid consisting mainly of the medium to be cooled, which is built in the heat transfer tube, and each of the initial results. Has achieved. For example, in FIG. 16A, by providing a large number of protrusions 30 on the inner surface of the flat heat transfer tube 50, a turbulent flow caused by the stirring action is generated in the cooled medium g flowing in the tube, and the outer peripheral surface of the heat transfer tube 50 is Improvement of the heat exchange performance to the cooling medium is achieved. Further, in the same figure (b), a corrugated plate fin 30a is built into the flat heat transfer tube 50a, and the cooling medium g flowing through the inside of the pipe is meandered, and in FIG. A spiral fin 30b is housed in the cylindrical heat transfer tube 50b, and the cooling medium g is swirled to generate a vortex flow. In FIG. 4D, the baffle 30c is incorporated in the flat heat transfer tube 50c. The cooling medium g flowing through the heat transfer tube 50c is forced to meander alternately, thereby extending the residence time in the tube and promoting efficient heat exchange efficiency. Conventionally, irregularities and wrinkles have been formed directly on the inner surface of the heat transfer tube, or plate fins and baffles of various shapes have been used to forcibly turbulently flow through the medium to be cooled flowing through the heat transfer tube. It has been devised to generate heat and eddy currents, and to promote the improvement of heat exchange efficiency, but it does not reach sufficient performance compared to the difficulty in processing and mounting methods, Further, there remains a big problem for improvement. The present invention is intended to solve such a problem, and is extremely easily processed, has a simple structure, has excellent cooling efficiency, and can be easily incorporated into heat transfer tubes having different shapes. The present invention provides a fin for fluid agitation, a method for producing the fin, a heat transfer tube in which the fin is installed, and a heat exchanger or a heat exchange type gas cooling device provided with at least one heat transfer tube.

  The plate fin for fluid agitation according to the first embodiment of the present invention for solving the above-described problem is mounted on the inside or inside and outside of the heat transfer tube, and the medium to be cooled flowing through the inside or inside and outside of the heat transfer tube or A plate fin for fluid agitation for causing a turbulent or vortex agitating action with respect to a fluid made of a cooling medium, the fin blade edges of the plate fin being opposed to each other in the vertical direction, and each of the abutted blade edges However, it is mounted inside or outside the heat transfer tube so as to cross.

  In the fluid stirring plate fin according to the present invention, the thin plate used as the plate material is a metal thin plate.

    According to the present invention, in the fluid agitation plate fin, the fluid agitation plate fins, which are installed in the heat transfer tube so as to face each other so as to cross the blade edge in the vertical direction, are individually processed in the vertical direction. It is characterized by.

  According to the present invention, in the fluid agitation plate fin, the fluid agitation plate fins, which are installed in the heat transfer tube so as to face each other so as to cross the blade edge in the vertical direction, are simultaneously processed in the vertical direction on the plate material. It is characterized in that it is furnished by bending the part.

  Further, the present invention provides the fluid stirring plate fin, wherein the blade tip is overlapped with a surface pressure in the fluid stirring plate fin that is installed in the heat transfer tube so as to cross the blade tip vertically. It is characterized in that it is built in or is provided with an interval between each cutting edge.

    Further, in the plate fin according to the present invention, when a portion where the blade edges are crossed facing each other in the vertical direction is predicted, a notched portion such as an uneven portion is formed in the portion predicted to cross, and the joint portion is formed. It is preferable that the upper and lower plate fins are joined together via the.

  In the plate fin according to the present invention, the shape of the blade edge of the plate fin may be linear or curved in the length direction, and the cross direction of the plate fin is either the same or alternate. preferable.

  Furthermore, in the plate fin according to the present invention, it is preferable that the heat transfer tube that houses the plate fin is a flat tube, a round tube, or other modified tubes.

  Furthermore, in the plate fin according to the present invention, it is preferable that the mounting means is appropriately selected from brazing, welding, adhesion using an adhesive, and other joining means in the heat transfer tube of the plate fin.

In addition, the method for manufacturing the fluid stirring plate fin according to the second embodiment of the present invention is a cooling medium or cooling medium that is mounted inside or inside and outside the heat transfer tube and flows inside or outside the heat transfer tube. A plate fin for fluid agitation for causing a turbulent or vortex agitating action on a fluid comprising a plurality of predetermined notches formed in a thin plate material, and the notches in the notches A plurality of fins for fluid agitation are formed on the surface of the plate material by raising the remainder perpendicular to the surface of the plate material.

  Further, the present invention provides the method for producing a plate fin for fluid agitation, wherein the notch forming means for the plate material is a press working or other mechanical working method or a chemical working method such as etching, or an optical method using a laser beam. It is any one of the mechanical processing methods.

    Furthermore, the heat exchanger according to the third embodiment of the present invention is attached to the inside or outside of the heat transfer tube, and with respect to the fluid composed of the cooling medium or the cooling medium flowing through the inside or outside of the heat transfer tube, A plate fin for fluid agitation for generating a turbulent or vortex agitating action, the fin blade edges of the plate fin being opposed to each other in the vertical direction, and each of the abutted blade edges being mounted so as to cross. In addition, at least one heat transfer tube is provided.

    In the heat exchange type gas cooling device according to the fourth embodiment of the present invention, at least one heat transfer tube through which the cooling medium flows is disposed so as to intersect the flow direction of the gas flowing through the gas pipe. In the heat exchange type gas cooling apparatus in which fluid stirring plate fins are mounted adjacent to the outer periphery of the heat transfer tube, the fin edges of the plate fins are opposed to each other in the vertical direction, and the respective blade edges that are abutted However, it is mounted so as to cross.

    The heat transfer tube according to the fifth embodiment of the present invention includes a plate fin for fluid agitation for causing a turbulent or vortex agitating action with respect to a fluid consisting of a cooled medium or a cooling medium flowing through the tube. In the heat transfer tube thus formed, the fin blade edges of the plate fins are opposed to each other in the up-and-down direction, and the respective blade edges that are abutted are arranged so as to cross each other.

  When the plate fin for fluid agitation according to the present invention is mounted inside or inside or outside the heat transfer tube through which the cooling medium or the cooling medium flows, the fin blade edges of the plate fin face each other up and down. Since each blade edge to be abutted is incorporated so as to cross, the fluid consisting of gas or liquid flowing through the inside or outside of the heat transfer tube is disturbed complicatedly, and the turbulence and vortex flow are complicated. The laminar flow is separated and effective stirring is repeated. Therefore, the fluid flowing through the inside or outside of the heat transfer tube repeatedly comes into contact with the wall surface of the heat transfer tube, and heat exchange with the cooling medium or the medium to be cooled on the outer peripheral surface of the heat transfer tube is efficiently promoted, resulting in excellent cooling efficiency. Secured. Further, the heat exchanger according to the present invention in which at least one heat transfer tube according to the present invention having the above-described plate fins is provided, the fluid flowing through the heat transfer tube repeatedly contacts the wall surface of the heat transfer tube, Heat exchange with the cooling medium on the surface is efficiently promoted, and excellent cooling efficiency is ensured. Furthermore, in the method for manufacturing a plate fin for fluid agitation according to the present invention, a plurality of predetermined notch portions are formed in a plate material made of a thin plate, and the remaining notch portions of the notch portions are perpendicular to the surface of the plate material. This is due to the extremely simple processing means of forming a plurality of fluid stirring fins on the surface of the plate material. In addition, the assembly to the heat transfer tube is not only a flat heat transfer tube, Since it can be easily installed even if it is a deformed tube, it can be installed inside or outside the heat exchanger tube for a heat exchanger such as a fuel cooler, oil cooler, intercooler, etc. It can be suitably installed as a plate fin for fluid agitation, and at the same time, its excellent heat exchange performance and the plate fin itself forms a core, which makes the device robust. Given and by allowing the size and weight, to achieve compactness of the device can be easily installed in a limited space.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.
FIG. 1 is a schematic partially enlarged perspective view for explaining a fluid stirring plate fin according to an embodiment of the present invention. FIG. 1 (a) shows a state in which a notch portion is provided by pressing on a thin plate material. FIG. 2 (b) shows a state in which the notches are raised at right angles to the surface of the plate material to form a plurality of plate fins, and FIG. 2 shows a flat heat transfer to the plate fins obtained by the same embodiment. FIG. 3 is a partially enlarged plan view on the line AA in FIG. 2, and FIG. 4 is a plan view showing a state where the plate fin obtained by the application example based on the embodiment is inserted into the flat heat transfer tube. FIG. 5 is a partially enlarged perspective view schematically showing a machining state of a fluid agitating plate fin according to another embodiment of the present invention, and FIG. Shows the state before matching, ( FIG. 6 is a partially enlarged front view partially illustrating the abutting state of the blade tips of the fluid agitating plate fins in an application example based on the embodiment, and FIG. Fig. 7 shows a state in which there is a gap, (b) shows a state in which there is no gap in the blade edge, (c) shows a state in which the protrusions provided on the blade edge are fitted together vertically, and (d) shows a state in which they are fitted together. FIG. 8 is a partially enlarged perspective view schematically showing still another embodiment according to the present invention, FIG. 8 is a partially enlarged front view showing an example of a method for attaching the plate fin to the heat transfer tube according to the present invention, and FIG. FIG. 10 is a partially enlarged perspective view schematically showing a fluid agitating plate fin according to still another embodiment of the present invention. FIG. 10 is a partially enlarged perspective view schematically showing a fluid agitating plate fin according to still another embodiment of the present invention. (A) shows that the plate fins are formed in the same direction. FIGS. 11A and 11B show the plate fins formed by alternately crossing the plate fins. FIG. 11 shows that the fluid stirring plate fins of the present invention are installed in a flat heat transfer tube, and a plurality of the heat transfer tubes are installed in an EGR cooler. FIG. 12 is a perspective view schematically showing the assembled state, FIG. 12 shows an oil cooler in which the fluid stirring plate fin of the present invention is mounted in a flat heat transfer tube, and the heat transfer tube alone is used, and (a) is a radiator bottom jacket. FIG. 13B is a side view schematically showing a state in which an oil cooler is formed by incorporating the heat transfer tube into the radiator bottom jacket. FIG. FIG. 14 is a longitudinal sectional side view showing a state in which the fluid stirring plate fin is mounted on the outer peripheral surface of the flat heat transfer tube of the EGR gas cooling device in another embodiment according to the invention. FIG. 15 and FIG. 15 are partially broken perspective views showing an embodiment in which the plate fin according to the present invention is incorporated in a plate heat exchanger.
[Example]

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited thereto, and can be freely modified within the scope of the gist of the present invention.

  The plate fin 3 for fluid agitation according to the first embodiment of the present invention is a thin plate made of austenitic stainless steel such as SUS304 or SUS316 having a thickness of about 0.1 to 0.5 mm as shown in FIG. A plurality of plate materials are obtained by processing into a square having the dimensions of, and press processing is performed on two of the plate materials. As shown in FIG. A plurality of cutout portions 2 each having a letter shape were formed. Next, the notch remaining portion of the notch 2 is cut and raised so as to be perpendicular to the surface of the plate material, and the blade tips 4 are straight in the longitudinal direction and the fluid stirring plate fins 3 having different directions alternately for each row are formed. The formed plate 1 was obtained. Two plates 1 obtained thereafter were prepared, and the blade tips 4 of the plate fins 3 formed on the respective plates 1 were butted against each other so as to face each other vertically and inserted into the flat heat transfer tube 5. As shown in FIG. 2, the flat heat transfer tube 5 in which the fluid stirring fins 3 are provided so as to overlap vertically is completed. The blade tips 4 of the plate fins 3 in the heat transfer tube 5 are flat heat transfer tubes formed by crossing them up and down as shown in FIG. A plurality are prepared and incorporated in the cooling jacket C as a gas flow path in an EGR gas cooling device (multi-tube heat exchanger) 10 as shown in FIG. 11 and subjected to a cooling performance test. The high-temperature EGR gas g flowing into the heat transfer tube 5d is complicatedly disturbed by the action of the fluid stirring plate fin, and turbulent flow and vortex flow are generated in the flow line of the gas g. The EGR gas g that has been peeled off and is effectively promoted to the cooling jacket C on the outer periphery of the heat transfer tube and reaches the bonnet D-2 on the outlet side is effectively cooled to the initial set temperature. It has been confirmed.

  The fluid agitating plate fins 3 according to the present embodiment are formed so that the heights of the fins facing each other in the vertical direction are the same, but the present invention is not limited thereto. As shown in FIG. 4, it does not prevent the upper and lower fins from having different heights such as heights h-1 and h-2. However, in this case, it is essential that the sum of the heights of the fins (h-1 + h-2) is in a range not exceeding the inner diameter h-3 of the short diameter portion of the flat heat transfer tube. In this example, a thin plate of austenitic stainless steel was adopted as the plate material for forming the fins, but it has a certain mechanical strength, excellent heat resistance, corrosion resistance and heat transfer, and good workability. As long as it is a simple material, it is not hindered to appropriately select from other metal materials. Furthermore, the means for forming the notch 2 in this embodiment is efficiently formed by press working. However, as a method for forming the notch, it can be mechanically cut, and further, a predetermined cutting method can be used. It is also possible to mold by masking and etching by chemical means in a corrosive solution to the plate material.

  A plate material in which the plate materials in Example 1 are joined together in the longitudinal direction is prepared, and predetermined cutout portions are provided on the left and right plate materials with the central bent portion 1a-3 as a boundary, After the notch remaining part of the notch is cut and raised to form the fluid stirring fin 3a as shown in FIG. 5A, the center is bent at the center bent part 1a-3, and the plate 1 (1a-1) and the plate 2 (1a -2) Except that the respective blade tips 4a of the fluid stirring fins 3a formed in FIG. As a result of completing the heat transfer tube with the plate fin 3a built in the same manner as in Example 1, and subjecting it to a cooling test with an EGR gas cooling device (multi-tube heat exchanger) as in Example 1, Example 1 URN to obtain the same cooling efficiency was confirmed.

  Instead of the fluid stirring plate fins 3 and 3a obtained in Example 1 or Example 2, the shape of the blade 4b is curved in the longitudinal direction. Except for the above, the plate fin 3b for fluid agitation was obtained in the same manner as in Example 1, and the heat transfer tube in which the fluid agitation fin 3b was built using the fin 3b was used. When subjected to a cooling test mounted on a cooling device, it was confirmed that the cooling efficiency was further improved as compared with Example 1.

In place of the folding at the central bent portion 1a-3 in the lateral width direction in the rectangular plate material in the second embodiment, the bent portion 1e is divided so that the longitudinal direction of the plate material 1e is vertically divided as shown in FIG. -3, and the shape of the blade edge 4e is the same in the left and right direction, the fluid stirring plate fin was formed in the same manner as in Example 2, and subjected to a cooling test under substantially the same conditions as in Example 2, It was confirmed that the performance according to Example 2 was obtained. Note that the fluid agitation fin shown in FIG. 10B is an application example of the present example, and the fluid agitation is performed in the same manner as in Example 4 except that the left and right fins 3f are alternately crossed. As a result of forming plate fins for use and subjecting them to a cooling test under the same conditions, it was confirmed that the cooling performance was superior to that of the same example.
[Other application examples]

  FIG. 6 illustrates the state of the blade edge of the fluid agitating plate fin in each embodiment of the present invention, wherein (a) has a certain gap in the blade edge 4; (b) The blade edge 4 is abutted with a constant surface pressure and is in close contact with no gap. In the cutting edge shown in (c) and (d), when a crossing portion is predicted in advance, the protrusion 4x and the notch 4y shown in (c), and the protrusion 4x-1 shown in (d) As in the notch 4y-1, by providing a predetermined joint portion in advance, when the interior is installed in the heat transfer tube or the like, it is integrated vertically through the joint portion. Therefore, between the plate fins formed of thin plates and the heat transfer tube forming the outer frame, by forming a support (core), the rigidity (robustness) is improved and no other reinforcing body is required, Contributes to reducing the overall size and weight of the device.

  FIG. 7 shows a state where a plate fin 3b for fluid agitation according to the present invention is installed in a heat transfer tube 5b made of a circular tube, and the plate fin 3b in this example is, for example, the plate 1 obtained in the first embodiment. It is also installed by rounding and inserting it into a circle, but at least two plates 1 are inserted, and the blades 4b of the plate fins 3b are faced to face each other so as to cross, so that a circular heat transfer tube Even so, the heat exchange performance comparable to the flat heat transfer tube in the first embodiment can be obtained.

  The means for fixing the fluid agitating plate fins obtained in the above embodiments according to the present invention to various heat transfer tubes is arbitrary and is not particularly limited. For example, the attachment means to the flat heat transfer tube 5c is shown in FIG. As shown, it can be carried out as appropriate by brazing, welding and bonding with adhesives, and other means for the joints 6 and 6-1. Further, in each of the above embodiments according to the present invention, only the EGR gas that is the cooling medium is illustrated as the fluid flowing through the heat transfer tube, but in other embodiments, for example, FIG. 13 and FIG. As shown in FIG. 5, it is possible to pass cooling water as a cooling medium through the heat transfer pipe 5f and to form a gas flow path g as a cooling medium on the outside of the heat transfer pipe 5f. In this case, the outer periphery of the heat transfer pipe 5f A turbulent flow or a vortex flow is generated in the EGR gas flowing through the surface, and the heat of the EGR gas contacting the outer peripheral surface of the heat transfer interval 5f can be efficiently exchanged.

  An oil inlet 5e-5 and an oil outlet 5e-6 as shown in FIG. 12 (a) are provided in, for example, a single flat heat transfer tube 5e equipped with fluid stirring plate fins obtained by the above embodiments of the present invention. The side lids 5e-1 and 5e-2 are attached to the open parts on both sides, sealed by caulking or welding, etc., and the whole is brazed into the radiator bottom jacket 6 as shown in FIG. The oil cooler 20 was configured by dipping and fixing. The high-temperature oil that is the medium to be cooled that has flowed from the oil inlet 5e-5 provided in the flat heat transfer tube 5e is agitated by the plurality of fluid agitation fins 3g provided in the heat transfer space 5e, and is turbulent or swirled. Is repeatedly brought into contact with the wall surface of the heat transfer tube 5e, effectively exchanging heat with the cooling water C as the cooling medium on the outer peripheral surface of the heat transfer tube, and when it flows out from the oil outlet 5e-6, the temperature is almost the initial set temperature. It was confirmed that it was cooled.

  In FIG. 5 in the second embodiment and FIG. 10 in the fifth embodiment, the direction of the notch is symmetrical with the center bent portions 1a-3 and 1e-3, but the same direction may be used and the fins are cut and raised. The direction is not important.

  As still another application example based on the present invention, FIG. 15 shows a state in which the fluid stirring fins 3h are installed in the plate heat exchanger 40. According to this example, the top plate 40-4 and the bottom plate 40-5 are provided. The gas flow path 40-2 and the cooling medium flow path 40-1 provided between the flat plates 40-3 divided into a plurality are provided with the fluid stirring fins 3h of the present invention, whereby the flat plate 40-3. The vortex and turbulent flow are generated in both the cooling medium C, which is a medium to be cooled, and the cooling water C, and the heat exchange through the flat plate 40-3 is effectively promoted. It is confirmed that the cooling efficiency can be realized, and in addition, the fluid stirring fin 3h forms a core between the top plate 40-4 or the bottom plate 40-5 and the flat plate 40-3, or between the flat plates 40-3. This contributes to the robustness of the device and realizes the heat exchanger body 40 to be small and light. Theft has been demonstrated.

  As is clear from the above embodiments and application examples thereof, the plate fin for fluid agitation according to the present invention is very easy to process, and the plate fin is not only a flat heat transfer tube but also a circular tube or the like. It can also be easily installed in a heat transfer tube consisting of a deformed tube. In addition, the heat exchange type cooling device such as the EGR gas cooling device is equipped with the heat transfer tube with the fluid stirring plate fin obtained by the present invention, although the structure thereof is simple. It exhibits excellent cooling efficiency. Therefore, in order to make the device lighter and smaller, not only the EGR gas cooling device for automobiles but also the target conditions of non-cooling medium and cooling medium are converted into gas-gas, gas-liquid, liquid-liquid. It is possible to respond flexibly even when the viscosity or temperature changes, and it can be used as another gas cooling device or a cooling device for liquids such as oil and fuel. A wide range of applications can be expected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic partially enlarged perspective view for explaining a fluid stirring plate fin according to an embodiment of the present invention, in which (a) shows a state in which a notch portion is provided by pressing in a thin plate material; (B) is a perspective view showing a state in which a plurality of plate fins are formed by raising the notches perpendicularly to the surface of the plate material. It is a front view which shows the state which inserted the plate fin obtained by the Example into the flat heat exchanger tube. It is a partially expanded plan view on the AA line in the said FIG. It is a partially expanded front view which shows the state which inserted the plate fin obtained by the application example based on the Example into the flat heat exchanger tube. It is a partial expanded perspective view which shows typically the processing state of the plate fin for fluid stirring by other Example which concerns on this invention, (a) shows the state before butting a blade edge | tip, and (b) shows it. It is a perspective view which shows the state piled up. FIG. 4 is a partially enlarged front view partially illustrating a state in which the blade tips of the fluid agitation plate fins meet in an application example based on the same embodiment, where (a) shows a state where there is a gap in the blade tip, and (b) shows a gap in the blade tip. (C) is a front view showing a state in which the protrusions provided on the blade edge are integrally fitted together, and (d) is a front view showing the same fitting state. It is a partially expanded perspective view which shows typically the further another Example which concerns on this invention. It is a partially expanded front view which shows an example of the attachment method to the heat exchanger tube of the plate fin which concerns on this invention. It is a partially expanded perspective view of the plate fin for fluid stirring by the further another Example which concerns on this invention. FIG. 5 is a partially enlarged perspective view schematically showing a fluid stirring plate fin according to still another embodiment of the present invention, in which (a) shows that the plate fins are formed in the same direction, and (b) shows that the plate fins alternate. It is a perspective view which shows what was crossed and formed. It is a perspective view which shows typically the state which built the plate fin for fluid agitation of the present invention in a flat heat exchanger tube, and also incorporated a plurality of these heat exchanger tubes in an EGR cooler (multi-tubular heat exchanger). 1 is a perspective view schematically showing a state of a single heat transfer tube before being incorporated in a radiator bottom jacket, wherein the fluid agitation plate fin of the present invention is installed in a flat heat transfer tube and the heat transfer tube is used alone. FIG. 2B is a side view schematically showing a state in which the single heat transfer tube is incorporated in a radiator bottom jacket to form an oil cooler. It is a vertical side view which shows the state which attached the plate fin for fluid stirring to the outer peripheral surface of the flat heat exchanger tube of an EGR gas cooling device in the further another Example which concerns on this invention. It is a cross-sectional front view of the EGR gas cooling device in the same Example. It is a partially broken perspective view which shows the Example which incorporated the plate fin which concerns on this invention in the plate type heat exchanger. It is a typical perspective view for demonstrating the heat exchanger tube which equipped with the conventional stirring fin structure, (a) is a flat heat exchanger tube which formed the protrusion in the heat exchanger tube wall surface, (b) It is a wave type to a flat heat exchanger tube. (C) shows a state in which strip-shaped fins are spirally installed on the inner peripheral surface of a circular heat transfer tube, and (d) shows a baffle formed on the inner peripheral surface of a flat heat transfer tube. It is each perspective view which shows what was shown.

Explanation of symbols

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h Plate 2, 2a, 2b, 2c, 2d, 2e, 2f Notch 3, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h Fins for fluid agitation 4, 4a, 4b, 4c, 4d, 4e, 4f Fin cutting edge 5, 5a, 5c, 5d, 5e, 5f Flat heat transfer tube 5b Circular tube 5e-1, 5e-2 Side lid 5e-3, 5e-4 O-ring 5e-5 Oil inlet 5e-6 Oil outlet 6 Radiator bottom jacket 5-6, 5-7, 5-8, 5-9, 5-10 Channel fin 6 Welding part 10 EGR cooler body (multi-tube Type heat exchanger)
DESCRIPTION OF SYMBOLS 20 Oil cooler main body 30 EGR cooler main body 30-1 Gas piping 30-2 Cooling jacket 30-3 Separator 30-4 Baffle 40 Plate type heat exchanger main body 40-1 Cooling medium flow path 40-2 Gas flow path 40-3 Flat plate 40-4 Top plate 40-5 Bottom plate D-1, D-2 Dust g EGR gas C, W Cooling water

Claims (14)

For fluid agitation, which is mounted inside or outside the heat transfer tube and causes a turbulent or vortex agitating action to occur in the fluid consisting of the medium to be cooled or the cooling medium flowing inside or outside the heat transfer tube It is a plate fin, The fin blade edge | tip of this plate fin is faced | matched up and down, and each blade edge | tip faced | matched is mounted inside or inside and outside of a heat exchanger tube so that it may cross. Plate fin for fluid agitation. The plate fin for fluid agitation according to claim 1, wherein the thin plate used as the plate material is a metal thin plate. The fluid agitation plate according to claim 1, wherein the fluid agitation plate fins, which are installed in the heat transfer pipe so as to face each other so as to cross the blade edge, are individually processed in the upper and lower sides. fin. The plate agitator for fluid agitation mounted in the heat transfer tube so as to cross the blade edge in the up and down direction is simultaneously processed in the upper and lower sides of the plate material, and is installed by bending the center portion thereof. A plate fin for fluid agitation according to claim 1. The fluid agitating plate fins, which are installed in the heat transfer tube so as to face each other so as to cross the blades up and down, are built up with the blades overlapped with a surface pressure, or spaced from each other. The plate fin for fluid agitation according to claim 1, wherein the plate fin for fluid agitation is provided. In the plate fin, when a portion where the blade edges are crossed facing each other in the up and down direction is predicted, a notched portion such as an uneven portion is formed in the crossing portion in advance, and the upper and lower plate fins are interposed via the joint portion. The plate fin for fluid agitation according to claim 1, which is integrally joined. The shape of the blade edge of the plate fin may be linear or curved in the length direction, and the cross direction of the plate fin is either the same or alternating. Plate fins. 2. The plate fin for fluid agitation according to claim 1, wherein the heat transfer tube in which the plate fin is housed is a flat tube, a round tube, or other deformed tubes. 2. The plate fin for fluid agitation according to claim 1, wherein the mounting means is suitably selected from brazing, welding, adhesion using an adhesive, and other joining means in the heat transfer tube of the plate fin. For fluid agitation, which is mounted inside or outside the heat transfer tube and causes a turbulent or vortex agitating action to occur in the fluid consisting of the medium to be cooled or the cooling medium flowing inside or outside the heat transfer tube A plate fin, wherein a plurality of predetermined notches are formed in a plate material made of a thin plate, and a notch portion of the notch is raised at a right angle to the surface of the plate material. A method of manufacturing a plate fin for fluid agitation, wherein a plurality of fins for fluid agitation are formed on the substrate. Claim 10 characterized in that the means for forming the notch in the plate material is any one of press processing, other mechanical processing methods, chemical processing methods such as etching, or optical methods such as laser beams. The manufacturing method of the plate fin for fluid stirring as described in 2 above. For fluid agitation, which is mounted inside or outside the heat transfer tube and causes a turbulent or vortex agitating action to occur in the fluid consisting of the medium to be cooled or the cooling medium flowing inside or outside the heat transfer tube It is a plate fin, and the fin blade edges of the plate fin are abutted against each other in the vertical direction, and at least one heat transfer tube mounted so that the abutted blade edges cross each other is disposed. Features heat exchanger. At least one heat transfer tube through which the cooling medium flows is arranged so as to intersect the flow direction of the gas flowing through the gas pipe, and a fluid stirring plate fin is mounted adjacent to the outer periphery of the heat transfer tube. In the heat exchange type gas cooling apparatus, the fin blade edges of the plate fins are opposed to each other in the vertical direction, and the respective blade edges that are abutted are mounted so as to cross each other. Cooling system. In a heat transfer tube having fluid stirring plate fins for causing a turbulent or vortex stirrer to act on a fluid to be cooled or a fluid consisting of a cooling medium flowing in the tube, the fin blade tip of the plate fin has A heat transfer tube characterized in that it is faced up and down, and the blade edges that are faced are housed so as to cross each other.