JP2010025447A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger easy in detecting an unbrazed portion and having a fin providing heat transfer. <P>SOLUTION: A condenser 1 includes a tube 5, and an inner fin 20 joined by brazing to inner walls 21, 22 of the tube 5. The inner fin 20 has abutting mountain parts 23 and abutting valley parts 25 that are joined by brazing, and separated mountain parts 24 and separated valley parts 26 that are not joined by brazing to the inner walls 21, 22. Out of three continuous mountain parts 23, 24, two are the abutting mountain parts 23 and the remaining one is the separated mountain part 24. Out of three continuous valley parts 25, 26, two are the abutting valley parts 25, and the remaining one is the separated valley part 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat exchanger in which fins are provided in a tube.

A conventional heat exchanger is composed of a tank and a core. In the core portion, outer fins and tubes are alternately stacked, and a tank is joined to the longitudinal end portion of the tube. Inner fins are provided in the tube. The inner fin has a corrugated cross-sectional shape and is brazed into the tube (see, for example, Patent Document 1).
JP 2007-292459 A

  In the conventional heat exchanger, it is detected whether or not there is a poorly brazed part (unbrazed part) by a pressure deformation method after the brazing process between the tube and the inner fin. In the pressure deformation method, when pressure is applied to the inside of the tube at a predetermined inspection pressure, the tube is subjected to internal pressure. Therefore, if there is an unbrazed portion in a part of the tube and the inner fin, the bulges from the unbrazed portion. appear. Thereby, an unbrazed portion can be visually recognized. When such a tube having an unbrazed portion on the inner fin is used repeatedly, its durability may deteriorate. Therefore, the static pressure deformation limit, which is the minimum inspection pressure at which a certain amount of deformation of the tube can be confirmed with the inspection pressure pressurized by the pressure deformation method, is also determined in advance according to the length of the unbrazed portion. In the inspection process, deformation and leaking leakage are detected to detect the presence of unbrazed parts.

  In order to set such limit conditions, it is necessary to adjust the material, strength, plate thickness, inner fin pitch (brazing pitch), and the like of the inner fin, for example. In order to facilitate the detection of the unbrazed portion, a configuration in which the inner fin pitch is increased and the amount of deformation by the pressure deformation method is increased can be considered, but by increasing the inner fin pitch, the heat transfer area is increased. There is a problem that the heat conductivity is reduced.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a heat exchanger having fins that can easily detect an unbrazed portion and can obtain heat transfer properties. To do.

  The present invention employs the following technical means in order to achieve the aforementioned object.

The present invention has a tube (5) in which the shape of a cross section perpendicular to the predetermined length direction (X) is flat, and a fluid flows through the inside,
A fin (20) provided in the tube and brazed to the inner wall (21, 22) of the tube,
Fins
In addition to the shape extending along the length direction, the cross-sectional shape as viewed in the length direction is formed in a wave shape in which peaks (23, 24) and valleys (25, 26) are alternately repeated,
The crest includes a contact crest (23) that abuts on the inner wall and is brazed to the inner wall, and a separated crest (24) that is separated from the inner wall and is not brazed to the inner wall.
Of the three consecutive ridges, two ridges are contact ridges, and the remaining one ridge is a separated ridge,
The valley has an abutting valley (25) that abuts the inner wall and is brazed to the inner wall, and a separated valley (26) that is separated from the inner wall and is not brazed to the inner wall.
Of the three continuous valleys, two valleys are contact valleys, and the remaining one valley is a separated valley, which is a heat exchanger.

  According to the present invention, the fin is formed in a wave shape so as to have a contact peak portion, a separation peak portion, a contact valley portion, and a separation valley portion. In this way, the fin is formed with the separation peak portion and the separation valley portion, and therefore, when there is an unbrazed portion that is not brazed and joined to the contact peak portion or the contact valley portion, the fin is adjacent to the unbrazed portion. The non-brazed region of the inner wall is enlarged by the separated mountain portion or the separated valley portion. As a result, when an inspection pressure for detecting an unbrazed portion is applied to the inner wall, the unbrazed area is increased by the separated portion, so the unbrazed portion is deformed by the inspection pressure and the unbrazed portion is detected. can do. Further, by forming the separation peak portion and the separation valley portion, the unbrazed portion is detected as described above even when the interval between the adjacent peak portions and the valley portion, which are the pitches of the fins, is reduced. be able to. Thus, the fin can be formed by selecting a pitch so as to obtain a desired heat transfer property. Therefore, according to the present invention, it is possible to realize a heat exchanger that can easily detect an unbrazed portion and obtain desired heat conductivity.

Further, according to the present invention, the interval (W2) between the two contact ridges located between the separated ridge portions is determined when an inspection pressure for inspecting the strength of the tube acts between the two contact ridge portions. , Set to be the tube strength that can tolerate the inspection pressure,
Alternatively, the interval between the two contact valleys located across the spaced valleys is set so that the strength of the tube can allow the test pressure when the test pressure acts between the two contact valleys. It is characterized by that.

  According to the present invention, the separated mountain portion and the separated valley portion are separated from the inner wall, but the strength of the tube is set so that the inspection pressure can be allowed even if such a separated portion exists. Therefore, when there is an unbrazed portion in the contact peak portion and the contact valley portion, the unbrazed portion can be reliably detected by the inspection pressure.

Further, in the present invention, the interval (W3) between two contact ridges located across one contact ridge is a case where the inspection pressure acts between the two contact ridges, When the contact peak is not brazed over a predetermined unbrazed length in the length direction, it is set to a value at which a part of the tube facing one contact peak is deformed by the inspection pressure,
Or the space | interval of the two contact valley parts located on both sides of one contact valley part is a case where test | inspection pressure acts between two contact valley parts, and one contact valley part is predetermined. In the case of unbrazing over the unbrazed length, it is characterized in that it is set to a value at which a part of the tube facing one contact valley is deformed by the inspection pressure.

  According to the present invention, when the unbrazed portion of the unbrazed length is in the contact peak portion or the contact valley portion, the unbrazed portion can be detected by the inspection pressure. As a result, an unbrazed portion to be detected can be reliably detected.

  Moreover, the present invention is characterized in that the interval between the peaks and the interval between the valleys (W1) are set such that the surface area of the fin is equal to or greater than a predetermined heat transfer area.

  According to the present invention, the pitch that is the interval between the peaks and the interval between the valleys is set so that the surface area of the fin is equal to or greater than the predetermined heat transfer area, so that the desired heat transfer property can be obtained, and An unbrazed portion can be detected.

  In addition, the code | symbol in the bracket | parenthesis of each above-mentioned means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing the capacitor 1 of the first embodiment. The condenser 1 is a heat exchanger that cools the refrigerant of the vehicle refrigeration cycle by heat exchange with cooling air from the outside. The capacitor 1 includes a core portion 2, a left header tank 3, a right header tank 4, and a liquid receiver. Each member is made of aluminum or an aluminum alloy so that sufficient thermal conductivity and durability can be obtained, and the contact portion of each member is joined by brazing or welding.

  The core part 2 includes a plurality of tubes 5, a plurality of outer fins 6, and side plates 7. Each tube 5 is formed in a longitudinal shape, and one end portion in the length direction X is connected to the left header tank 3, and the other end portion in the length direction X is connected to the right header tank 4. Each tube 5 is a tube member through which a refrigerant flows. The cross-sectional shape of the tube 5 is a shape that increases the cross-sectional area as much as possible in a limited space and reduces the flow resistance of the refrigerant. For example, a flat square shape is selected. The plurality of tubes 5 are arranged side by side in the stacking direction Z in which both the tanks 3 and 4 of the left header tank 3 and the right header tank 4 are extended. The plurality of tubes 5 are arranged such that the length directions X are substantially parallel to each other (the term “substantially parallel” includes parallel).

  Hereinafter, the direction in which each tube 5 extends is referred to as a length direction X (left-right direction in FIG. 1), and the direction orthogonal to the length direction X is referred to as a width direction Y (direction perpendicular to the paper surface of FIG. 1). A direction perpendicular to the direction X and the width direction Y may be referred to as a stacking direction Z (vertical direction in FIG. 1).

  The plurality of outer fins 6 are a plurality of fins and are provided between the plurality of tubes 5, and transmit the heat of the refrigerant flowing through the plurality of tubes 5 to the cooling air flowing around. Therefore, each outer fin 6 is provided between the tubes 5 adjacent to each other in the stacking direction Z. The tubes 5 and the outer fins 6 are alternately stacked in the stacking direction Z. The outer fins 6 are, for example, corrugated fins that are formed into a wave shape from a thin flat plate material. Each tube 5 is brazed to the adjacent outer fin 6. The outermost outer fin 6 in the stacking direction Z is brazed to the side plate 7.

  The side plates 7 are provided on both outermost sides in the stacking direction Z, and support the plurality of tubes 5 and the plurality of outer fins 6. The side plate 7 is a reinforcing member that extends in the length direction X of the tube 5.

  The left header tank 3 includes a header plate 8, a tank body 9, and joints 3b and 3c. Since the right header tank 4 has the same configuration as the left header tank 3, the same parts are denoted by the same reference numerals and description thereof may be omitted.

  The header plate 8 is a plate member, and is provided with an edge standing portion (not shown) on the outer peripheral portion of the elongated flat plate. The header plate 8 is provided with a tube hole (not shown) penetrating in the thickness direction at a position corresponding to one end portion in the length direction X of each tube 5. The tube hole is formed so as to be slightly larger than the cross-sectional shape of the tube 5 in consideration of the fitting property of the tube 5.

  One end in the length direction X of the tube 5 is inserted and fitted into the tube hole of the header plate 8, and the tube 5 and the header plate 8 are brazed to each other by a paste-like brazing material applied to the fitting portion. Yes. In this way, the tube 5 and the header tanks 3 and 4 are configured to communicate with each other. One end portion in the length direction X of the side plate 7 is brazed to the header plate 8 by a paste-like brazing material applied to a contact portion with the header plate 8.

  The tank body 9 is an elongated half-container body that is open on the header plate 8 side, and the opening side is welded to the edged portion of the header plate 8 to form a tank internal space. In each of the header tanks 3 and 4, separators 3 a and 4 a that partition the tank internal space at the same position in the stacking direction Z are provided. An inlet joint 3b is brazed to one side of the stacking direction Z from the separator 3a of the left header tank 3, and an outlet joint 3c is brazed to the other side of the stacking direction Z. Each joint 3b, 3c communicates with the space in the tank of the left header tank 3. The inlet joint 3b is connected to the discharge side of a compressor (not shown) in the refrigeration cycle apparatus (not shown). The outlet joint 3c is connected to an expansion valve (not shown) in the refrigeration cycle apparatus.

  The liquid receiver 150 includes a substantially cylindrical liquid receiver tank 151 and lid members 154 and 155 that close the openings 151 a at both ends in the stacking direction Z of the liquid receiver tank 151. The lid member 154 is provided with an abutting portion 154 a that abuts on the right header tank 4. The liquid receiver 150 is fixed to the right header tank 4 via the contact portion 154a and the plate 160, and the inside of the right header tank 4 and the liquid receiver 150 by communication paths 171 and 172 provided so as to sandwich the separator 4a. Are in communication with each other.

  In such a condenser 1, the refrigerant discharged from the compressor flows into the left header tank 3 from the inlet joint 3b, flows through the tube 5 group on one side in the stacking direction Z of the separators 3a and 4a, and exchanges heat with external air. It is condensed and liquefied. Further, the refrigerant flows into the liquid receiver 150 from the communication path 171 of the right header tank 4 and is separated into gas and liquid. Among the gas-liquid separated refrigerant, the liquid phase refrigerant is further subcooled from the right header tank 4 via the communication path 172 in the tube 5 group on the other side in the stacking direction Z from the separators 3a and 4a, and expanded from the outlet joint 3c. Spill into the valve.

  Next, the tube 5 will be described in more detail with reference to FIG. FIG. 2 is a cross-sectional view showing one tube 5 when viewed from the section line II-II in FIG. 1. Each tube 5 has an inner fin 20 inserted therein. In FIG. 2, the thickness dimension of the inner fin 20 is omitted for easy understanding. The inner fin 20 is formed in a wave shape from a thin flat plate material, gives a turbulent flow effect to the flow of the refrigerant, and improves the heat transfer coefficient of the tube 5. Moreover, since the cross-sectional shape of the tube 5 is flat, the inner fin 20 is efficiently accommodated without generating a dead space in the tube 5. Inner fin 20 is formed of, for example, an aluminum clad material clad with a brazing material.

  The inner fin 20 is brazed to the inner walls 21 and 22 of the tube 5 by a brazing material (not shown) previously applied to the inner walls 21 and 22 of the tube 5. Specifically, the brazing material previously applied to the inner walls 21 and 22 of the tube 5 is melted in a brazing furnace and wraps around the contact portion between the inner fin 20 and the inner walls 21 and 22 of the tube 5 by a capillary effect. Then, brazing is performed at the contact portion.

  The inner fin 20 functions as a reinforcing member for improving the structural strength of the tube 5. The inner fin 20 is a corrugated fin formed by forming a thin strip-shaped plate material into a wave shape by roller processing.

  The inner fin 20 extends along the length direction X, and the cross-sectional shape when viewed from the length direction X is formed in a wave shape in which peak portions 23 and 24 and valley portions 25 and 26 are alternately repeated. Further, the peak portions 23 and 24 of the inner fin 20 abut on an inner wall 21 (hereinafter, also referred to as “upper inner wall 21”) extending in the width direction Y on one side in the stacking direction Z of the tubes 5 and brazed. There are a contact ridge portion 23 to be joined and a separation ridge portion 24 that is separated from the upper inner wall 21.

  Further, the valley portions 25 and 26 of the inner fin 20 abut on the inner wall 22 (hereinafter, also referred to as “lower inner wall 22”) extending in the width direction Y on the other side in the stacking direction Z of the tubes 5 and brazed. There are a contact valley portion 25 to be joined and a separation valley portion 26 that is separated from the lower inner wall 22.

  Next, the arrangement of the mountain parts 23 and 24 will be described. The three ridges 23 and 24 are formed so that each ridge 23 and 24 becomes a contact ridge 23, a contact ridge 23, and a separation ridge 24 in order from one width direction Y to the other in the width direction Y. Repeatedly arranged as a set. Therefore, the crest 23 adjacent to the separated crest 24 is a contact crest 23. Further, at least one of the two peak parts 23 and 24 adjacent to the contact peak part 23 is provided with a separation peak part 24.

  Next, the arrangement of the valleys 25 and 26 will be described. The arrangement of the valley portions 25 and 26 is the same as the arrangement of the peak portions 23 and 24 described above, and the valley portions 25 and 26 sequentially contact the valleys in the width direction Y toward the other in the width direction Y. The three valley portions 25 and 26 are repeatedly arranged as one set so as to be the portion 25, the contact valley portion 25 and the separation valley portion 26. Therefore, the valley portion 25 adjacent to the separation valley portion 26 becomes the contact valley portion 25. In addition, a separation valley portion 26 is provided in at least one of the two valley portions 25 and 26 adjacent to the contact valley portion 25.

  Next, the arrangement of the mountain parts 23 and 24 and the valley parts 25 and 26 will be described. A trough 26 sandwiched between two continuous contact crests 23 becomes a separated trough 26. Further, the peak portion 24 sandwiched between the two continuous contact valley portions 25 becomes the separation peak portion 24. Therefore, the contact valley portion 25 is disposed in one of the contact ridge portions 23 in the width direction Y, and the separation valley portion 26 is disposed in either one of the width directions Y.

  Next, the dimensions of the inner fin 20 of the present embodiment will be described with reference to the inner fin 20A of the comparative example. FIG. 3 is a perspective view showing an inner fin 20A of a comparative example. FIG. 4 is a perspective view showing the inner fin 20 of the first embodiment. 3 and 4, the thickness of the inner fin 20 is omitted and the tube 5 is omitted for easy understanding.

  The inner fin 20A of the comparative example has a wave shape in which the crests 23 and the troughs 25 are alternately repeated, and both the crests 23 and the troughs 25 are in contact with the upper inner wall 21 or the lower inner wall 22 of the inner fin 20A. The fin height is set. The fin pitch W1 of the inner fin 20A of the comparative example is substantially equal to the inner fin 20 of the present embodiment. The remaining configuration of the comparative example is the same configuration as the inner fin 20 of the present embodiment.

  After the inner fins 20 and 20A are brazed to the tube 5, it is detected whether or not there are poorly brazed portions (unbrazed portions 27 and 28) by a pressure deformation method. In the pressure deformation method, when a pressure is applied to the inside of the tube 5 with a predetermined inspection pressure, an internal pressure is applied to the tube 5, so that a relatively large unbrazed portion 27, part of the tube 5 and the inner fins 20, 20 </ b> A. When 28 is present, the unbrazed portions 27 and 28 are deformed. In the present embodiment, the term “deformation” means (1) deformation greater than or equal to a deformation amount that can detect bulges by a predetermined method, or (2) deformation leading to breakage leakage.

  In the inner fin 20A of the comparative example, as shown in FIG. 3, an unbrazed portion 28 (the portion shown by hatching in FIG. 3) having an unbrazed length L <b> 1 is continuous over two peak portions 23. In such a case, the first region R1 where the internal pressure is applied to the unbrazed portion 28 (the region surrounded by the broken line in FIG. 3) is smaller than the second region R2 where the internal pressure is applied in the present embodiment described later. Low volume and high burst pressure Therefore, the inner fin 20A of the comparative example cannot detect the unbrazed portion 28 having the relatively small unbrazed length L1. Such an unbrazed portion 28 has a small amount of swelling, but if the inner fin 20A is continuously used, even if the inspection pressure is small and the static pressure breaking strength is satisfied, pressure is repeatedly applied. Then there is a risk of fatigue failure. Therefore, it is necessary to detect such an unbrazed portion 28.

  In the inner fin 20 of the present embodiment, as shown in FIG. 4, there is an unbrazed portion 27 (the portion shown by hatching in FIG. 4) having an unbrazed length L1. Further, in the inner fin 20 of the present embodiment, since the contact peak portion 23 and the separation peak portion 24 are formed, the separation peak portion 24 is an unbrazed portion, but the separation peak portion 24 is not brazed. The brazed portion is an unbrazed portion that does not need to be detected. In other words, since the inner fin 20 and the tube 5 are separated from each other by the separation mountain portion 24, the inner fin is at such a distance as not to be deformed by the pressure deformation method even if an internal pressure is applied between the adjacent contact mountain portions 23. Twenty pitches W1 are set. Therefore, the interval W2 between the two contact ridges 23 located across the separation ridge 24 is determined when the inspection pressure for inspecting the strength of the tube 5 acts between the two contact ridges 23. It sets so that it may become the intensity | strength of the tube 5 which can accept | permit a pressure.

  In such a case, when the unbrazed portion 27 is generated in the contact peak portion 23 as described above, the second region R2 (region surrounded by a broken line in FIG. 4) to which the internal pressure is applied at the time of the inspection becomes the separation peak portion 24. This is larger than the first region R1 of the comparative example, so that the pressure receiving area is increased. Further, the length dimension W3 in the width direction Y of the second region R2 is equal to the first region R1 of the comparative example, but the unbrazed portion 27 of the present embodiment is deformed by the separation mountain portion 24 extending in the length direction X. It becomes easy to do.

  The length dimension W3 of the second region R2 is an interval W3 between two contact ridges located with one contact ridge interposed therebetween. This length dimension W3 is a case where the inspection pressure acts between the two contact ridges 23, and one contact ridge 23 sandwiched between the two contact ridges 23 is an unbrazed portion. At 27, it is set to be equal to or greater than the minimum value at which the unbrazed portion is deformed by the inspection pressure. As a result, the unbrazed portion 27 is deformed by the inspection pressure as virtually shown in FIG. 2, so that the unbrazed portion 27 can be detected. When the above-mentioned unbrazed portion 27 is generated in the contact ridge portion 23 in this way, the unbrazed portion 27 is always adjacent to the unbrazed portion 27 of the separation ridge portion 24. The unbrazed portion 27 of the portion 23 can be detected.

  FIG. 5 is a graph showing an example of the relationship between the unbrazed length, the inspection pressure, and the number of pressurization repetitions. The horizontal axis of the graph indicates the unbrazed length, the left vertical axis indicates the inspection pressure, and the right vertical axis indicates the number of pressurization repetitions. In FIG. 5, the static pressure deformation limit of the inner fin 20 of the present embodiment is indicated by a solid line, and the static pressure deformation limit of the inner fin 20A of the comparative example is indicated by a broken line, leading to the destruction of the inner fin 20 of the present embodiment. The number of pressurization repetitions is indicated by a dashed line.

  The unbrazed length L1 to be detected (minimum unbrazed length L1) is determined from the graph of FIG. The number of pressurization repetitions R0 is set based on the fluid passing through the tube 5, the pressure of the refrigerant in the present embodiment, and the like. Accordingly, such an unbrazed length L1 is a length dimension that is deformed by a predetermined number of pressurization repetitions R0. When the unbrazed length L1 is obtained, the minimum inspection pressure P0 for the pressure deformation method of the inner fin 20 of the present embodiment is obtained from the graph of FIG. Therefore, when actually inspecting by the pressure deformation method, the inspection is performed at a value equal to or higher than the minimum inspection pressure P0, for example, the inspection pressure P1 shown in FIG. By performing the inspection based on the inspection pressure P1 set in this way, the unbrazed portion 27 to be detected can be reliably detected.

  As described above, the inner fin 20 constituting the capacitor 1 of the present embodiment is formed in a wave shape so as to have the contact mountain portion 23, the separation mountain portion 24, the contact valley portion 25, and the separation valley portion 26. The In this way, the inner fin 20 is formed with the separation mountain portion 24 and the separation valley portion 26, so when there is an unbrazed portion 27 that is not brazed and joined to the contact valley portion 25 or the contact valley portion 25, The unbrazed area 27 of the inner walls 21 and 22 is enlarged by the unsealed portion 27 and the separated mountain portion 24 or the separated valley portion 26 adjacent to each other (see FIG. 4). As a result, when an inspection pressure for detecting the unbrazed portion 27 is applied to the inner walls 21 and 22, the unbrazed region R2 becomes larger due to the unbrazed portion 27. It is possible to deform and detect the unbrazed portion 27.

  Further, by forming the separation mountain portion 24 and the separation valley portion 26, the unbrazed portion 27 can be detected as described above even when the pitch W1 of the inner fins 20 is reduced. As a result, the pitch W1 is selected to increase the surface area of the inner fin 20, and the inner fin 20 can be formed so as to have a predetermined heat transfer area or more. Therefore, in the present embodiment, it is possible to realize the capacitor 1 in which the unbrazed portion 27 can be easily detected and desired heat conductivity can be obtained.

  In the present embodiment, the separation valley portion 26 is formed between the adjacent contact mountain portions 23. As a result, when there is an unbrazed portion 27 in the contact peak portion 23, the unsealed portion 27 is easily deformed by the separation valley portion 26, although it is expanded by the inspection pressure. Since there is the separation valley portion 26 that is not brazed to the inner walls 21 and 22, the deformation in the direction in which the contact valley portion 25 expands is larger than when the position of the separation valley portion 26 is the contact valley portion 25. . Therefore, the unbrazed portion 27 can be reliably detected.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the first embodiment described above, the heat exchanger is realized by the condenser 1, but the heat exchanger is not limited to this, and any heat exchanger having a tube with a built-in fin may be used such as a radiator or an intercooler. You may apply to another heat exchanger. Moreover, you may use other materials, such as aluminum or aluminum alloy, as the basic material of the member which comprises a heat exchanger. Moreover, you may form so that the tube 5 and the inner fin 20 may consist of one flat plate (one-stroke drawing shape). As a one-stroke drawing shape, for example, the length direction X one end part of the tube 5 and the length direction X one end part of the inner fin 20 may be configured to be continuous.

It is a front view showing capacitor 1 of a 1st embodiment. It is sectional drawing which shows the one tube 5 seeing from the cut surface line II-II of FIG. It is a perspective view which shows the inner fin 20A of a comparative example. It is a perspective view which shows the inner fin 20 of 1st Embodiment. It is a graph which shows an example of the relationship between unbrazed length and test | inspection pressure.

Explanation of symbols

1 ... Condenser (heat exchanger)
2 ... Core part 3 ... Left header tank 4 ... Right header tank 5 ... Tube 6 ... Outer fin 20 ... Inner fin (fin)
21 ... Upper inner wall (inner wall)
22 ... Lower inner wall (inner wall)
23 ... Contact mountain portion 24 ... Separation mountain portion 25 ... Contact valley portion 26 ... Separation mountain portion 27 ... Unbrazed portion

Claims (4)

A tube (5) in which the shape of the cross section perpendicular to the predetermined length direction (X) is flat, and the fluid flows through the inside;
A fin (20) provided in the tube and brazed to the inner wall (21, 22) of the tube;
The fin is
The shape extends along the length direction, and the cross-sectional shape as viewed in the length direction is formed in a wave shape in which peaks (23, 24) and valleys (25, 26) are alternately repeated,
The peak portion includes a contact peak portion (23) that contacts the inner wall and is brazed to the inner wall, and a spaced peak portion (24) that is spaced from the inner wall and is not brazed to the inner wall. Yes,
Of the three consecutive ridges, the two ridges are contact ridges, and the remaining one ridge is a separated ridge,
The valley portion includes a contact valley portion (25) that contacts the inner wall and is brazed to the inner wall, and a separation valley portion (26) that is separated from the inner wall and is not brazed to the inner wall. Yes,
Of the three continuous valleys, the two valleys are contact valleys, and the remaining one valley is a separated valley. The distance (W2) between the two contact ridges located across the separation ridge is determined when an inspection pressure for inspecting the strength of the tube acts between the two contact ridges. It is set to be the strength of the tube that allows the inspection pressure,
Or the space | interval of the two said contact valley parts located on both sides of the said separation valley part is the intensity | strength of the said tube which can accept | permit the said test pressure when the said test pressure acts between the said two contact valley parts. The heat exchanger according to claim 1, wherein the heat exchanger is set to be The interval (W3) between the two contact ridges located across the one contact ridge is the case where the inspection pressure acts between the two contact ridges, When the contact ridge is not brazed over a predetermined unbrazed length in the length direction, a value is set such that a part of the tube facing the one contact ridge is deformed by the inspection pressure. And
Alternatively, the interval between the two contact valleys located across the one contact valley is the case where the inspection pressure acts between the two contact valleys, and the one contact valley When the valley is not brazed over the predetermined unbrazed length, it is set to a value at which a part of the tube facing the one abutting valley is deformed by the inspection pressure. The heat exchanger according to claim 1 or 2.   The interval between the ridges and the interval between the valleys (W1) is set so that the surface area of the fin is equal to or greater than a predetermined heat transfer area. The described heat exchanger.

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