JP4714487B2 - Corrugated fin inspection method and inspection device, heat exchanger ventilation performance inspection method and ventilation performance inspection device, and heat exchanger pressure resistance inspection method and pressure resistance inspection device - Google Patents

Description

  The present invention relates to a corrugated fin inspection method and inspection device, a heat exchanger ventilation performance inspection method and ventilation performance inspection device, and a heat exchanger pressure resistance inspection method and pressure resistance inspection device.

  In this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  As a heat exchanger, a pair of aluminum headers arranged parallel to each other at intervals, and a plurality of hollow refrigerant circulation portions arranged in parallel between both headers and having both ends connected to both headers, respectively. A flat heat exchange pipe made of aluminum and an aluminum corrugated fin brazed to both heat exchange pipes and disposed in a ventilation gap between adjacent heat exchange pipes are widely used. . As is well known, the corrugated fin has a wave crest portion, a wave bottom portion, and a connecting portion that connects the wave crest portion and the wave bottom portion.

  As the flat heat exchange pipe, for example, two flat walls parallel to each other, both side walls straddling both side edges of both flat walls, and between both side walls, extend over both flat walls and extend in the length direction and have a predetermined distance from each other. And a plurality of reinforcing walls provided in parallel with each other and having parallel fluid passages therein, and each reinforcing wall is integrally formed in a protruding shape inward from one flat wall. The ridges for walls and the ridges for reinforcement walls integrally molded in an inwardly protruding shape from the other flat wall are formed by mutually butting and brazing. There is known one in which the attached portion is an internal joint portion (see Patent Document 1).

  In the heat exchanger having the flat heat exchange pipe described above, in order to obtain the required pressure resistance, the protruding ridges for the reinforcing wall should have sufficient brazing strength without causing defective brazing. It needs to be attached.

  However, it is not possible to easily know the brazing part of the reinforcing wall convex stripes, that is, the occurrence of brazing failure of the internal joint, and the strength of the reinforcing wall convex stripes, and as a result heat exchange At present, it is not possible to easily check the pressure resistance of the vessel.

  However, as a result of various studies by the present inventors, in the flat heat exchange pipe described above, when the brazing strength of the brazing portions of the reinforcing wall projections is insufficient, when the inside of the heat exchange pipe is pressurized, Since the corrugated fins arranged in the ventilation gap are deformed because the internal joint is destroyed and the flat heat exchange tubes swell, the pressure resistance of the flat heat exchange tubes is known by grasping the state of the corrugated fins. I found that I can do it.

Further, in the heat exchanger described above, the corrugated fins are deformed in a state before being pressurized, or a large amount of flux used when brazing the heat exchange pipe and the corrugated fins remains. As a result, the ventilation gap is blocked, and sufficient ventilation performance cannot be obtained. As a result, the heat exchange performance may deteriorate. At present, the presence / absence of deformation of the corrugated fins and the amount of residual flux are visually inspected, but the work is extremely troublesome. Moreover, since it depends on oversight due to human error in visual inspection and the ability of the inspector, stable inspection cannot be performed.
JP-A-6-281373

  The present invention has been made in view of the above circumstances, and the corrugated fin inspection method and inspection apparatus capable of easily and accurately grasping the state of the corrugated fin and the ventilation performance of the heat exchanger are performed relatively easily and accurately. Provided are a ventilation performance inspection method and a ventilation performance inspection apparatus for a heat exchanger, and a pressure inspection method and a pressure inspection apparatus for a heat exchanger capable of relatively easily and accurately inspecting the pressure resistance of the heat exchanger. For the purpose.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A method for inspecting a corrugated fin having a wave crest, a wave bottom, and a connecting portion that connects the wave crest and the wave bottom,
The corrugated fin is irradiated with light from one side in the width direction, and the same portion of the corrugated fin is similarly imaged on the opposite side by imaging means from a plurality of directions to obtain a plurality of images of the same portion. A corrugated fin inspection method, comprising: determining a state of a corrugated fin based on luminance information of a plurality of images.

  2) The corrugated fin inspection method according to 1) above, wherein the corrugated fin is imaged from a plurality of directions simultaneously by a plurality of imaging means.

  3) By capturing the same part of the corrugated fin from a plurality of directions by an imaging means, a plurality of monochrome images of the same part are obtained, and each monochrome image is subjected to gray processing and each monochrome image is divided into a plurality of dots. The brightness information in each dot is binarized into a white portion and a black portion by a predetermined threshold, and the number of black portions is counted, and the state of the corrugated fin is determined based on the number of black portions in each image. ) Or 2) Corrugated fin inspection method.

  4) The corrugated fin inspection method according to 3), wherein the calculation is performed such that the number of black portions in a plurality of monochrome images with respect to the same portion of the corrugated fin is added or averaged, and the calculation result is used for determining the state of the corrugated fin.

5) A device for inspecting a corrugated fin having a wave crest, a wave bottom, and a connecting portion that connects the wave crest and the wave bottom,
A light irradiation means that is disposed on one side of the corrugated fin in the width direction and that irradiates the corrugated fin with light, and is disposed on the opposite side of the light irradiation means with the corrugated fin interposed therebetween, and images the same part of the corrugated fin from multiple directions An inspection apparatus for corrugated fins, comprising: imaging means for performing the processing, and processing means for determining the state of the corrugated fins based on luminance information of a plurality of images for the same portion of the corrugated fins obtained by the imaging means.

  6) The corrugated fin inspection apparatus according to 5) above, wherein a plurality of imaging means having an angle of view are arranged such that the optical axes are parallel and the imaging ranges of adjacent imaging means partially overlap.

  7) The corrugated fin inspection apparatus according to 6), wherein the imaging means is a CCD camera.

  8) The corrugated fin according to 5) above, wherein the plurality of imaging means having lenses for converging parallel light are arranged so that the optical axes are directed in different directions and the imaging ranges of adjacent imaging means are partially overlapped. Inspection equipment.

  9) The processing means applies gray processing to a plurality of monochrome images of the same part obtained by imaging the same part of the corrugated fin from a plurality of directions by the imaging means and divides each monochrome image into a plurality of dots, The brightness information in each dot is binarized into a white portion and a black portion by a predetermined threshold, the number of black portions is counted, and the state of the corrugated fin is determined based on the number of black portions. ). The corrugated fin inspection apparatus according to any one of the above.

  10) The corrugated fin according to the above 9), wherein the processing means calculates so as to add or average the number of black portions in the plurality of monochrome images with respect to the same portion of the corrugated fin, and uses the calculation result for determining the state of the corrugated fin. Inspection equipment.

  11) The corrugated fin inspection device according to any one of 5) to 10), wherein the processing means is an image processing device.

12) A plurality of hollow refrigerant circulation portions are provided in parallel, and a gap between adjacent refrigerant circulation portions is a ventilation gap, and a wave crest portion, a wave bottom portion, a wave crest portion and a wave bottom portion are formed in the ventilation gap. A method for inspecting the ventilation performance of a heat exchanger in which corrugated fins having a connecting portion for connecting to are arranged,
The heat exchanger is irradiated with light from one side in the ventilation direction, and the same part of the heat exchanger is similarly imaged on the opposite side by imaging means from a plurality of directions to obtain a plurality of images of the same part. A ventilation performance inspection method for a heat exchanger, wherein the ventilation performance of the heat exchanger is determined based on luminance information of a plurality of images.

  13) The ventilation performance inspection method for a heat exchanger according to the above 12), wherein imaging from a plurality of directions of the heat exchanger is performed simultaneously by a plurality of imaging means.

  14) The same part of the heat exchanger is imaged from multiple directions by the imaging means to obtain a plurality of monochrome images of the same part, and each monochrome image is subjected to gray processing and each monochrome image is divided into a plurality of dots. , The brightness information in each dot is binarized into a white part and a black part with a predetermined threshold, and the number of black parts is counted, and the ventilation performance of the heat exchanger is determined based on the number of black parts in each image The ventilation performance inspection method for a heat exchanger as described in 12) or 13) above.

  15) The heat exchanger according to the above 14), wherein the number of black portions in a plurality of monochrome images with respect to the same portion of the heat exchanger is calculated or averaged, and the calculation result is used for determining the ventilation performance of the heat exchanger. Ventilation performance inspection method.

16) A plurality of hollow refrigerant circulation portions are provided in parallel, and a gap between adjacent refrigerant circulation portions is a ventilation gap, and a wave crest portion, a wave bottom portion, a wave crest portion and a wave bottom portion are formed in the ventilation gap. A device for inspecting the ventilation performance of a heat exchanger in which a corrugated fin having a connecting portion for connecting the
Light irradiation means arranged on one side of the heat exchanger in the ventilation direction and irradiating the heat exchanger with light, arranged on the opposite side of the light irradiation means across the heat exchanger, and the same part of the heat exchanger A heat exchanger comprising: imaging means for imaging from a plurality of directions; and processing means for determining the ventilation performance of the heat exchanger based on luminance information of a plurality of images for the same portion of the heat exchanger obtained by the imaging means Ventilation performance inspection device.

  17) The ventilation performance inspection of the heat exchanger according to 16) above, wherein the plurality of imaging means having an angle of view are arranged such that the optical axes are parallel and the imaging ranges of adjacent imaging means partially overlap. apparatus.

  18) A ventilation performance inspection device for a heat exchanger as described in 17) above, wherein the imaging means comprises a CCD camera.

  19) The heat exchange according to 16) above, wherein the plurality of imaging means having a lens for converging parallel light are arranged so that the optical axes are directed in different directions and the imaging ranges of adjacent imaging means are partially overlapped. Ventilation performance inspection device

  20) The processing means applies gray processing to a plurality of monochrome images of the same part obtained by imaging the same part of the heat exchanger from a plurality of directions by the imaging means and divides each monochrome image into a plurality of dots. , The brightness information in each dot is binarized into a white part and a black part with a predetermined threshold, and the number of black parts is counted, and the ventilation performance of the heat exchanger is determined based on the number of black parts in each image The ventilation performance inspection device for a heat exchanger according to any one of 16) to 19) above.

  21) The above processing 20), wherein the processing means calculates so as to add or average the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger, and uses the calculation result to determine the ventilation performance of the heat exchanger. Ventilation performance inspection device for heat exchangers.

  22) The ventilation performance inspection device for a heat exchanger according to any one of 16) to 21), wherein the processing means is an image processing device.

23) A plurality of hollow refrigerant circulation portions having internal joints are provided in parallel, and adjacent refrigerant circulation portions form ventilation gaps, and in the ventilation gap, a wave crest portion, a wave bottom portion, and A method for inspecting the pressure resistance of a heat exchanger in which a corrugated fin having a connecting portion that connects a wave top portion and a wave bottom portion is disposed,
The inside of the heat exchanger is pressurized, and before and after this pressurization, light is irradiated from one side of the ventilation direction of the heat exchanger, respectively, and the same part of the heat exchanger on the opposite side is also taken from a plurality of directions by the imaging means. A plurality of images of the same part are obtained by imaging, and the pressure resistance of the heat exchanger is determined based on luminance information of the plurality of images of the same part before and after the pressurization. Pressure resistance inspection method.

  24) The pressure resistance inspection method for a heat exchanger according to the above 23), wherein imaging from a plurality of directions of the heat exchanger is performed simultaneously by a plurality of imaging means.

  25) The same part of the heat exchanger is imaged from multiple directions by the imaging means to obtain a plurality of monochrome images of the same part, and each monochrome image is subjected to gray processing and each monochrome image is divided into a plurality of dots. The luminance information in each dot is binarized into a white portion and a black portion with a predetermined threshold, and the number of black portions is counted, and black after pressurization with respect to the number of black portions before pressurization in each image The pressure resistance test method for a heat exchanger as described in 23) or 24) above, wherein the pressure resistance of the heat exchanger is determined based on the increased number of portions.

  26) Calculate to add or average the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger, and use this calculation result for pressure resistance determination of the heat exchanger described in 25) above Method.

27) A plurality of hollow refrigerant circulation portions having internal joints are provided in parallel, and adjacent refrigerant circulation portions form ventilation gaps, and the ventilation gap includes a wave crest portion, a wave bottom portion, and A method for inspecting the pressure resistance of a heat exchanger in which a corrugated fin having a connecting portion that connects a wave top portion and a wave bottom portion is disposed,
Light is irradiated from one side of the ventilation direction of the heat exchanger, and the same part of the heat exchanger is imaged from a plurality of directions by the imaging means on the opposite side of the ventilation direction of the heat exchanger. Obtain an image, then pressurize the inside of the heat exchanger, and after the start of pressurization, continuously or intermittently image the same part of the heat exchanger on the opposite side of the ventilation direction of the heat exchanger from multiple directions by the imaging means To obtain a plurality of images of the same part, and continuously or intermittently change the luminance information of the plurality of images for the same part before pressurization and the luminance information of the plurality of images for the same part after pressurization. The pressure resistance test method for a heat exchanger is characterized in that the pressure resistance of the heat exchanger is determined based on the above.

  28) The ventilation performance inspection method for a heat exchanger as described in 27) above, wherein imaging from a plurality of directions of the heat exchanger is performed simultaneously by a plurality of imaging means.

  29) By capturing the same part of the heat exchanger from multiple directions by imaging means, a plurality of monochrome images of the same part are obtained, and each monochrome image is subjected to gray processing and each monochrome image is divided into a plurality of dots. The luminance information in each dot is binarized into a white portion and a black portion with a predetermined threshold, and the number of black portions is counted, and the number of black portions before pressing in each image and the black after pressing 27. The heat exchanger pressure resistance test method according to the above 27) or 28), wherein the pressure resistance of the heat exchanger is determined based on a continuous change or intermittent change in the number of portions.

  30) A calculation to add or average the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger, and the calculation result of the heat exchanger according to the above 29) is used to determine the pressure resistance. Method.

31) A plurality of hollow refrigerant circulation portions having internal joints are provided in parallel between a pair of headers arranged at intervals, and ventilation is provided between adjacent refrigerant circulation portions. An apparatus for inspecting the pressure resistance of a heat exchanger in which a corrugated fin having a crest portion, a wave bottom portion, and a connecting portion that connects the wave crest portion and the wave bottom portion is disposed in the ventilation gap and being a gap,
Pressurization means for pressurizing the inside of the heat exchanger, light irradiation means for irradiating the heat exchanger with light disposed on one side in the ventilation direction of the heat exchanger, and opposite to the light irradiation means with the heat exchanger in between An imaging unit that is arranged on the side and that captures the same part of the heat exchanger from a plurality of directions to obtain a plurality of images, and a plurality of the same part obtained by the imaging unit before and after pressurization by the pressurization unit A heat exchanger pressure resistance inspection apparatus comprising: processing means for determining pressure resistance of the heat exchanger based on a change in luminance information of an image.

  32) The pressure resistance test of the heat exchanger according to 31) above, wherein the plurality of imaging means having an angle of view are arranged such that the optical axes are parallel and the imaging ranges of adjacent imaging means are partially overlapped apparatus.

  33) The heat exchanger pressure resistance inspection apparatus according to 32) above, wherein the imaging means is a CCD camera.

  34) The heat exchange according to 31), wherein the plurality of imaging means having a lens for converging parallel light are arranged so that the optical axes are directed in different directions and the imaging ranges of adjacent imaging means are partially overlapped. Pressure resistance testing equipment.

  35) The processing means applies gray processing to a plurality of monochrome images of the same part obtained by imaging the same part of the heat exchanger from a plurality of directions by the imaging means and divides each monochrome image into a plurality of dots. The luminance information in each dot is binarized into a white portion and a black portion with a predetermined threshold value, and the number of black portions is counted, and pressurization is performed on the number of black portions before pressurization by the pressurizing means in each image. The pressure resistance test apparatus for a heat exchanger according to any one of 31) to 34) above, wherein the pressure resistance of the heat exchanger is determined based on an increase in the number of subsequent black portions.

  36) The processing means applies gray processing to a plurality of monochrome images of the same part obtained by imaging the same part of the heat exchanger from a plurality of directions by the imaging means and divides each monochrome image into a plurality of dots. The luminance information in each dot is binarized into a white portion and a black portion with a predetermined threshold value, and the number of black portions is counted. The pressure resistance test apparatus for a heat exchanger according to any one of 31) to 34) above, in which the pressure resistance of the heat exchanger is determined based on a continuous change or intermittent change in the number of black portions after pressing.

  37) The processing means calculates so as to add or average the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger, and uses the calculation result for the determination of pressure resistance. Pressure resistance inspection device for heat exchangers.

  38) The pressure resistance inspection apparatus for a heat exchanger according to any one of 31) to 37), wherein the processing means is an image processing apparatus.

39) A heat exchanger production line comprising the ventilation performance inspection device according to any one of 16) to 22 ) above.

40) A heat exchanger production line provided with the pressure resistance test apparatus according to any one of 31) to 38 ) above.

  According to the method of 1) above, a plurality of images of the same part are obtained by imaging the same part of the corrugated fin from a plurality of directions by an imaging means, and the corrugated image is obtained based on luminance information of the plurality of images of the same part. Since the state of the fin is determined, for example, even if the corrugated fin is deformed to such an extent that the ventilation performance is not affected, the state of the corrugated fin can be determined easily and accurately. That is, for example, if the connecting portion of the corrugated fin is tilted so as not to affect the ventilation performance, the luminance information of this image may be inaccurate in some cases only by obtaining an image from one direction by the imaging means. For example, the amount of light passing through the gap between adjacent connecting portions of corrugated fins may be insufficient, and may be determined as a defective product. On the other hand, when this part is imaged from a plurality of directions by an imaging means to obtain a plurality of images, the light quantity in the luminance information of the image obtained by imaging from one direction is insufficient, but the other directions The amount of light in the luminance information of the image obtained by imaging from is sufficient. Therefore, when the state of the corrugated fin is determined based on the luminance information, it is not determined that the ventilation performance is insufficient at the stage before pressurization. In addition, oversight due to human error in visual inspection and stable inspection independent of the ability of the inspector are possible.

  According to the method 2), the time required for the work is shortened as compared with the case where a plurality of images of the same part are obtained by imaging the same part of the corrugated fin from a plurality of directions by one imaging means. . In addition, a mechanism for moving one imaging unit is not necessary.

  According to the above method 3), for example, even if the corrugated fin is deformed to such an extent that the ventilation performance is not affected, the state of the corrugated fin can be determined easily and accurately. That is, in a part of the heat exchanger, if the connecting part of the corrugated fin is tilted so as not to affect the ventilation performance, when this part is imaged from one direction by the imaging means, an image is obtained in the ventilation gap. The amount of light passing through the gap between adjacent connecting parts of the arranged corrugated fins is insufficient, the number of black parts is excessive, and defective products with insufficient ventilation performance at the stage before pressurization May be judged. On the other hand, when a plurality of images are obtained by imaging this portion from a plurality of directions by the imaging means, the number of binarized black portions in the monochrome image obtained by imaging from one direction is excessive. The number of binarized black portions in the monochrome image obtained by imaging from other directions is reduced. Therefore, if the state of the corrugated fin is determined based on the number of these black portions, it is not determined that the ventilation performance is not sufficient before the pressurization.

  In the method of 3), as in the method of 4), the number of black portions in a plurality of monochrome images with respect to the same portion of the corrugated fin is calculated or averaged, and the result of the calculation is the state of the corrugated fin. By using it for the determination, it can be carried out relatively easily.

  When the corrugated fin is inspected using the apparatus of 5), the same effect as that of the method of 1) is obtained.

  When the corrugated fin is inspected using the apparatuses 6) and 8), the same effects as those of the method 2) are obtained.

  According to the apparatus 7), the cost of the imaging means is relatively low.

  When the corrugated fin is inspected using the apparatus of 9), the same effect as that of the method of 3) is obtained.

  When the corrugated fin is inspected using the apparatus of 10), the same effects as those of the method of 4) are obtained.

  According to the method of 12), a plurality of images of the same part are obtained by imaging the same part of the heat exchanger from a plurality of directions by an imaging unit, and based on luminance information of the plurality of images of the same part. Since the ventilation performance of the heat exchanger is determined, for example, even if the corrugated fin is deformed to such an extent that the ventilation performance is not affected, the ventilation performance of the heat exchanger can be inspected easily and accurately. That is, for example, if the connecting portion of the corrugated fin is tilted so as not to affect the ventilation performance, the luminance information of this image may be inaccurate in some cases only by obtaining an image from one direction by the imaging means. For example, the amount of light passing through the gap between adjacent connecting portions of corrugated fins arranged in the ventilation gap may be insufficient, and it may be determined as a defective product with insufficient ventilation performance. On the other hand, when this part is imaged from a plurality of directions by an imaging means to obtain a plurality of images, the light quantity in the luminance information of the image obtained by imaging from one direction is insufficient, but the other directions The amount of light in the luminance information of the image obtained by imaging from is sufficient. Therefore, if the ventilation performance of the heat exchanger is determined based on the luminance information, it is not determined that the ventilation performance is not sufficient before the pressurization. In addition, oversight due to human error in visual inspection and stable inspection independent of the ability of the inspector are possible.

  According to the above method 13), the time required for the work is shortened as compared with the case where a plurality of images of the same part are obtained by imaging the same part of the heat exchanger from a plurality of directions by one imaging means. The In addition, a mechanism for moving one imaging unit is not necessary.

  According to the above method 14), for example, even if the corrugated fin is deformed so as not to affect the ventilation performance, the ventilation performance of the heat exchanger can be determined easily and accurately. That is, in a part of the heat exchanger, if the connecting part of the corrugated fin is tilted so as not to affect the ventilation performance, when this part is imaged from one direction by the imaging means, an image is obtained in the ventilation gap. The amount of light passing through the gap between adjacent connecting parts of the arranged corrugated fins is insufficient, the number of black parts is excessive, and defective products with insufficient ventilation performance at the stage before pressurization May be judged. On the other hand, when a plurality of images are obtained by imaging this portion from a plurality of directions by the imaging means, the number of binarized black portions in the monochrome image obtained by imaging from one direction is excessive. The number of binarized black portions in the monochrome image obtained by imaging from other directions is reduced. Therefore, when the ventilation performance of the heat exchanger is determined based on the number of these black portions, it is not determined that the ventilation performance is not sufficient before the pressurization.

  In the method of 14), as in the method of 15), the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger is calculated or averaged, and the calculation result is calculated by the heat exchanger. By using it for the determination of the ventilation performance, it can be implemented relatively easily.

  When the ventilation performance of the heat exchanger is inspected using the apparatus of 16), the same effect as that of the method of 12) is obtained.

  When the ventilation performance of the heat exchanger is inspected using the devices 17) and 19), the same effect as the method 13) is obtained.

  According to the apparatus 18), the cost of the imaging means is relatively low.

  When the ventilation performance of the heat exchanger is inspected using the apparatus of 20), the same effect as that of the method of 14) is obtained.

  When the ventilation performance of the heat exchanger is inspected using the apparatus of 21), the same effect as that of the method of 15) is obtained.

  According to the method of 23) above, when a poor bonding occurs in the internal joint of the hollow refrigerant circulation part, or when the joint strength of the internal joint is insufficient, the inside of the heat exchanger is When the pressure is applied, the internal joint portion is destroyed and the refrigerant circulation portion expands, and the corrugated fins arranged in the ventilation gap are deformed. Therefore, before and after pressurization, light is emitted from one side of the heat exchanger in the ventilation direction, and the same portion of the heat exchanger is imaged from the same direction on the opposite side by imaging means from a plurality of directions. When the above image is obtained, the luminance information in each image before and after the pressurization is different. On the other hand, if no poor bonding occurs in the internal joint part of the hollow refrigerant circulation part and the joint strength of the internal joint part is sufficiently high, even if the inside of the heat exchanger is pressurized, the refrigerant circulation part No bulge or deformation of the corrugated fin occurs, and the luminance information in each image before and after the pressurization hardly changes. Therefore, the pressure resistance of the heat exchanger can be determined based on such luminance information, and as a result, the pressure resistance of the heat exchanger can be easily and accurately inspected. Further, since the same part of the heat exchanger is imaged from a plurality of directions by imaging means to obtain a plurality of images of the same part, the corrugated fins arranged in the ventilation gap do not affect the ventilation performance. Even if it is deformed, the pressure resistance of the heat exchanger can be inspected easily and accurately. That is, for example, if the connecting portion of the corrugated fin is tilted so as not to affect the ventilation performance, the luminance information of this image may be inaccurate in some cases only by obtaining an image from one direction by the imaging means. For example, the amount of light passing through the gap between adjacent connecting portions of corrugated fins arranged in the ventilation gap may be insufficient, and it may be determined as a defective product with insufficient ventilation performance. On the other hand, when this part is imaged from a plurality of directions by an imaging means to obtain a plurality of images, the light quantity in the luminance information of the image obtained by imaging from one direction is insufficient, but the other directions The amount of light in the luminance information of the image obtained by imaging from is sufficient. Therefore, if the pressure resistance of the heat exchanger is determined based on the luminance information, it is not determined that the product has insufficient ventilation performance before or after pressurization. In addition, oversight due to human error in visual inspection and stable inspection independent of the ability of the inspector are possible.

  According to the method of 24), the time required for the work is shortened compared to the case where a plurality of images of the same part are obtained by imaging the same part of the heat exchanger from a plurality of directions by one imaging means. The In addition, a mechanism for moving one imaging unit is not necessary.

  According to the above method 25), even if the corrugated fin is deformed to such an extent that it does not affect the ventilation performance, the ventilation performance of the heat exchanger can be determined easily and accurately. That is, in a part of the heat exchanger, if the connecting part of the corrugated fin is tilted so as not to affect the ventilation performance, when this part is imaged from one direction by the imaging means, an image is obtained in the ventilation gap. The amount of light passing through the gap between adjacent connecting parts of the arranged corrugated fins is insufficient, the number of black parts is excessive, and defective products with insufficient ventilation performance at the stage before pressurization While being determined, it may be determined as a defective product with insufficient pressure resistance at the stage after pressurization. On the other hand, when a plurality of images are obtained by imaging this portion from a plurality of directions by the imaging means, the number of binarized black portions in the monochrome image obtained by imaging from one direction is excessive. The number of binarized black portions in the monochrome image obtained by imaging from other directions is reduced. Therefore, when the pressure resistance of the heat exchanger is determined based on the number of these black portions, it is not determined that the product has insufficient ventilation performance before or after pressurization.

  In the method of 25), as in the method of 26), the number of black portions in a plurality of monochrome images with respect to the same portion of the heat exchanger is calculated or averaged, and the calculation result is determined as pressure resistance. By using this, it becomes relatively easy to implement.

  According to the method of 27) above, if there is a bonding failure at the internal joint of the hollow refrigerant circulation part, or if the bonding strength of the internal joint is insufficient, the inside of the heat exchanger is When the pressure is applied, the inner joint portion is broken and the refrigerant circulation portion is deformed so as to be greatly expanded, and the corrugated fin disposed in the ventilation gap is greatly deformed. Therefore, before and after pressurization, light is emitted from one side of the heat exchanger in the ventilation direction, and the same portion of the heat exchanger is imaged from the same direction on the opposite side by imaging means from a plurality of directions. When the image is obtained, the luminance information in each image before and after the pressurization becomes different, and the luminance information in each image after the pressurization changes. On the other hand, if no poor bonding occurs in the internal joint part of the hollow refrigerant circulation part and the joint strength of the internal joint part is sufficiently high, even if the inside of the heat exchanger is pressurized, the refrigerant circulation part No bulge or deformation of the corrugated fin occurs, the change in luminance information in each image before and after the pressurization is small, and the change in luminance information in the luminance information in each image after the pressurization is also small. Therefore, the pressure resistance of the heat exchanger can be determined based on the luminance information of each image before pressurization and the continuous or intermittent change of the luminance information of each image after pressurization, and as a result, heat exchange The pressure resistance of the vessel can be easily and accurately inspected. Further, since the same part of the heat exchanger is imaged from a plurality of directions by imaging means to obtain a plurality of images of the same part, the corrugated fins arranged in the ventilation gap do not affect the ventilation performance. Even if it is deformed, the pressure resistance of the heat exchanger can be inspected easily and accurately. That is, for example, if the connecting portion of the corrugated fin is tilted so as not to affect the ventilation performance, the luminance information of this image may be inaccurate in some cases only by obtaining an image from one direction by the imaging means. For example, the amount of light passing through the gap between adjacent connecting portions of corrugated fins arranged in the ventilation gap may be insufficient, and it may be determined as a defective product with insufficient ventilation performance. On the other hand, when this part is imaged from a plurality of directions by an imaging means to obtain a plurality of images, the light quantity in the luminance information of the image obtained by imaging from one direction is insufficient, but the other directions The amount of light in the luminance information of the image obtained by imaging from is sufficient. Therefore, if the pressure resistance of the heat exchanger is determined based on the luminance information, it is not determined that the product has insufficient ventilation performance before or after pressurization. In addition, oversight due to human error in visual inspection and stable inspection independent of the ability of the inspector are possible.

  Further, when the inside of the heat exchanger is pressurized, the refrigerant circulation part and the corrugated fin are slightly deformed even when the internal joint is not broken, but the luminance information in the imaging range after pressurization changes continuously or intermittently. Based on the change, the deformation start pressure and the deformation end pressure of the refrigerant circulation part and the fin can be known, and the pressure resistance of the heat exchanger can be inspected in more detail. Also, based on the relationship between the continuous change or intermittent change in the luminance information of the imaging range and the applied pressure, the type of the joint defect at the internal joint part of the hollow refrigerant circulation part can be known, and the joint defect is eliminated. Can take measures. Furthermore, when the bonding strength of the internal joint of the refrigerant circulation part is extremely low, the refrigerant circulation part may be destroyed at a stroke before the internal pressure reaches the set value. The breaking pressure can be assumed from the correlation between the continuous or intermittent change of luminance information and the internal pressure. In addition, when the change in luminance information in the image after pressurization reaches a certain limit, it is possible to prevent the inspection apparatus from being damaged due to the destruction of the entire heat exchanger by stopping the internal pressurization.

  According to the above method 28), the time required for the work is shortened as compared with the case where a plurality of images of the same part are obtained by imaging the same part of the heat exchanger from a plurality of directions by one imaging means. The In addition, a mechanism for moving one imaging unit is not necessary.

  According to the above method 29), even if the corrugated fin is deformed to such an extent that it does not affect the ventilation performance, the ventilation performance of the heat exchanger can be determined easily and accurately. That is, in a part of the heat exchanger, if the connecting part of the corrugated fin is tilted so as not to affect the ventilation performance, when this part is imaged from one direction by the imaging means, an image is obtained in the ventilation gap. The amount of light passing through the gap between adjacent connecting parts of the arranged corrugated fins is insufficient, the number of black parts is excessive, and defective products with insufficient ventilation performance at the stage before pressurization While being determined, it may be determined as a defective product with insufficient pressure resistance at the stage after pressurization. On the other hand, when a plurality of images are obtained by imaging this portion from a plurality of directions by the imaging means, the number of binarized black portions in the monochrome image obtained by imaging from one direction is excessive. The number of binarized black portions in the monochrome image obtained by imaging from other directions is reduced. Therefore, when the pressure resistance of the heat exchanger is determined based on the number of these black portions, it is not determined that the product has insufficient ventilation performance before or after pressurization.

  In the method of 29), as in the method of 30), the calculation is performed such that the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger is added or averaged. By using this, it becomes relatively easy to implement.

  When the pressure resistance of the heat exchanger is inspected using the apparatus 31), the same effects as those of the methods 23) and 27) are obtained.

  When the pressure resistance of the heat exchanger is inspected using the apparatuses 32) and 34), the same effects as those of the methods 24) and 28) are obtained.

  According to the apparatus 33), the cost of the imaging means is relatively low.

  When the pressure resistance of the heat exchanger is inspected using the apparatus of 35), the same effect as that of the method of 25) is obtained.

  When the pressure resistance of the heat exchanger is inspected using the apparatus of 36), the same effect as that of the method of 29) is obtained.

  When the pressure resistance of the heat exchanger is inspected using the apparatus of 37), the same effects as those of the methods of 26) and 30) are obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description of the refrigerant circulation part of the heat exchanger, the upper and lower sides and the left and right sides in FIGS.

  FIG. 1 shows an example of a heat exchanger whose pressure resistance is inspected by the apparatus of the present invention, and FIG. 2 shows an example of a flat heat exchange tube as a refrigerant circulation part used in the heat exchanger. 3 shows a method for producing the flat heat exchange tube shown in FIG. FIG. 4 is an enlarged view of the main part of FIG.

  In FIG. 1, a heat exchanger (1) is used as a condenser for a car air conditioner. A pair of headers (2) (3) and a pair of headers (2) ( 3) Adjacent heat exchange with a plurality of aluminum flat heat exchange tubes (4) (hollow refrigerant circulation section) arranged in parallel between both ends and connected to both headers (2) and (3) respectively. Located in the ventilation gap (5) between the tubes (4) and connected to the aluminum corrugated fins (6) brazed to both heat exchange tubes (4) and the upper end of the peripheral wall of the first header (2) The inlet pipe (7), the outlet pipe (8) connected to the lower end of the peripheral wall of the second header (3), and the first provided in the upper position above the middle of the first header (2). A partition plate (9) and a second partition plate (10) provided in a position below the middle of the second header (3) are provided. The inlet pipe (7) and the first partition plate (9 ) The number of heat exchange tubes (4) between Number of heat exchange tubes (4) between 1 partition plate (9) and second partition plate (10), number of heat exchange tubes (4) between 2nd partition plate (10) and outlet tube (8) Are sequentially reduced from above to form a group of passages, and until the gas-phase refrigerant flowing in from the inlet pipe (7) becomes a liquid phase and flows out from the outlet pipe (8), the heat exchanger ( 1) It is designed to flow in a meandering manner in each passage group.

  As shown in FIG. 2, the flat heat exchange pipe (4) is composed of flat upper and lower walls (11) and (12) facing each other, and both left and right side walls straddling the left and right edges of the upper and lower walls (11) and (12). (13) (14) and a plurality of reinforcing walls extending between the upper and lower walls (11), (12) and extending in the length direction between the left and right side walls (13) (14) and provided at predetermined intervals from each other (15) and has a plurality of parallel fluid passages (16) inside. Although not shown in the figure, all the reinforcing walls (15) are provided with a plurality of communication holes through which adjacent fluid passages (16) pass so as to form a staggered arrangement as viewed from above. Yes.

  The left side wall (13) is integrally formed in a protruding shape for the side wall (17) integrally formed in a protruding shape downward from the left side edge of the upper wall (11) and in a protruding shape in the upward direction from the left side edge of the lower wall (12). Side wall ridges (18) are formed by being butted against each other. The right side wall (14) is formed integrally with the upper and lower walls (11) (12).

  The reinforcing wall (15) is a reinforcing wall ridge (19) integrally formed in a raised shape below the upper wall (11), and a reinforcing wall ridge integrally formed in a raised shape above the lower wall (12). (20) are brazed against each other, and the brazed portion between the reinforcing wall projections (19) and (20) is an internal joint.

  The flat heat exchange tube (4) is manufactured using a metal plate (25) for manufacturing a flat heat exchange tube as shown in FIG. The flat heat exchanger tube manufacturing metal plate (25) is made of an aluminum brazing sheet having a brazing filler metal layer on both sides, and includes a flat upper wall forming part (26) (flat wall forming part) and a lower wall forming part (27) ( A flat wall forming part), an upper wall forming part (26) and a lower wall forming part (27), and a connecting part (28) forming a right side wall (14); an upper wall forming part (26) and a lower wall forming part; Side wall protrusions (17) and (18) integrally formed in a raised shape above the side edge of the wall forming part (27) opposite to the connecting part (28) and forming the left side wall (13), and the left-right direction And a plurality of reinforcing wall ridges (19) and (20) integrally formed in a raised shape above the upper wall forming portion (26) and the lower wall forming portion (27) at a predetermined interval, The reinforcing wall ridges (19) of the upper wall forming portion (26) and the reinforcing wall ridges (20) of the lower wall forming portion (27) are located symmetrically with respect to the center line in the width direction. . The heights of the ridges for both side walls (17) and (18) and all the ridges for reinforcing walls (19) and (20) are equal. Bending and positioning ridges (29) are integrally formed over the entire length of most of the connecting portion (28) except for the left and right side edges.

  The side wall protrusions (17), (18) and the reinforcing wall protrusions (19), (20) are integrally formed on one side of the aluminum brazing sheet clad with the brazing material on both sides, thereby forming the side wall protrusions. A brazing filler metal layer (not shown) is formed on both side surfaces and tip surfaces of the strips (17) and (18) and the reinforcing wall projections (19) and (20) and on both upper and lower surfaces of the upper and lower wall forming portions (26) and (27). However, the brazing filler metal layers on the front end faces of the side wall ridges (17) and (18) and the reinforcing wall ridges (19) and (20) are thicker than the brazing filler metal layers in the other portions. Further, a protrusion (31) extending in the longitudinal direction is integrally formed over the entire length on the front end surface of the side wall protrusion (18) in the lower wall forming portion (27). On the other hand, a concave groove (32) extending in the longitudinal direction and into which the protrusion (31) is press-fitted is formed over the entire length on the front end surface of the side wall protrusion (17) in the upper wall forming portion (26). A brazing filler metal layer is also present on the tip surface and both side surfaces of the protrusion (31) and on the bottom surface and both side surfaces of the groove (32).

  Then, the metal plate (25) for manufacturing the flat heat exchange tube is sequentially bent at the left and right edges of the connecting portion (28) by the roll forming method (see FIG. 3 (b)), and finally bent into a hairpin shape. The side wall ridges (17) and (18) and the reinforcing wall ridges (19) and (20) face each other, and the protrusion (31) is press-fitted into the groove (32) to bend the body ( 33) (see Fig. 3 (c)), and the tips of the side wall ridges (17) and (18) and the tips of the reinforcing wall ridges (19) and (20) are brazed to form a flat surface. A heat exchanger tube (4) is manufactured. At this time, the left side wall (13) by the protruding ribs for side walls (17) and (18) brazed to each other, the right side wall (14) by the connecting part (28), and the upper wall by the upper wall forming part (26) ( 11), the lower wall 12 is formed by the lower wall forming portion 27, and the reinforcing wall 15 is formed by the reinforcing wall projections 19 and 20 brazed to each other.

  As shown in FIG. 4, the corrugated fin (6) includes a wave crest (6a), a wave bottom (6b), and a flat connection (6c) that connects the wave crest (6a) and the wave bottom (6b). A plurality of louvers (6d) (see FIG. 8) are formed in parallel at the connecting portion (6c).

The heat exchanger (1) is manufactured as follows. First, a plurality of bent bodies (33) for forming the flat heat exchange pipe (4) are prepared, and a pair of aluminum headers (2) having the same number of bent body insertion holes as the bent bodies (33). (3) and a plurality of aluminum corrugated fins (6) are prepared. Next, a pair of headers (2) and (3) are arranged at intervals, and a plurality of folded bodies (33) and fins (6) are alternately arranged, and both ends of the folded body (33) are attached to the header. (2) Insert into the bent body insertion hole in (3). Thereafter, these are heated to a predetermined temperature, and the ridges (17), (18) for the side walls of the bent body (33) and the ridges for the reinforcing wall (19), (20), the bent body (33) and the header (2 ) (3), and the bent body (33) and the corrugated fin (6) are simultaneously brazed using the brazing material layer of the metal plate (25) for producing a flat heat exchange tube. Thus, the heat exchanger (1) is manufactured. This heat exchanger (1) constitutes a refrigeration cycle using a chlorofluorocarbon refrigerant as a condenser, together with a compressor and an evaporator, and is mounted on an automobile as a car air conditioner, for example. The heat exchanger (1) includes a car air conditioner having a compressor, a gas cooler as a refrigerant cooler, an intermediate heat exchanger, an expansion valve and an evaporator and using a supercritical refrigerant such as a CO ₂ refrigerant. In a vehicle such as an automobile, it may be applied to a gas cooler of a car air conditioner.

  5 and 6 schematically show the configuration of the pressure resistance test apparatus for a heat exchanger according to the present invention. In the description of the pressure resistance inspection apparatus, the upper and lower sides and the left and right sides in FIGS.

  In FIG. 5, the pressure resistance inspection apparatus is a holding device (40) (holding means) that holds the heat exchanger (1) in a horizontal state, that is, the ventilation direction (width direction of the corrugated fin (6)) is directed vertically. And a high pressure air supply device (41) (pressurizing means) for supplying high pressure air to the inside of the heat exchanger (1) held and sealed by the holding device (40) to pressurize the heat exchanger (1) ), Illumination (42) (light irradiation means) for irradiating light from below to the heat exchanger (1) held by the holding device (40), and a heat exchanger (1) held by the holding device (40) ) And a plurality of CCD cameras (43) (imaging means) whose optical axes are parallel to each other, an image processing device (44) (processing means) And an operation / display device (45) for displaying the inspection result.

  The holding device (40) holds both headers (2) and (3) of the heat exchanger (1) so as not to block the ventilation gap (5).

  Between the heat exchanger (1) held by the holding device (40) and the illumination (42), a light diffusing plate (46) that diffuses light emitted from the illumination (42) uniformly to form surface illumination. ) Is arranged. Note that the number of the illuminations (42) is preferably small in consideration of the cost, the heat generation amount, and the like. Even if the number of illuminations (42) is small, surface illumination can be achieved by the action of the light diffusion plate (46).

  The high-pressure air supply device (41) includes a high-pressure air supply hose (not shown) having a connector connected to the inlet pipe (7) or the outlet pipe (8) of the heat exchanger (1) at the tip.

  The CCD camera (43) has an angle of view and is arranged so that the optical axes are parallel to each other in the vertical direction and the imaging ranges of a plurality of adjacent CCD cameras (43) partially overlap. Yes. Each CCD camera (43) directly captures the image of the heat exchanger (1) irradiated with light from below by the illumination (42) as a monochrome image, and sends the image signal to the image processing device (44). Output.

  As shown in FIG. 6, each part (A2), (A3), and (A4) excluding the part (A1) near both headers (2) and (3) in the heat exchanger (1) is a plurality of adjacent ones, here Images are taken from a plurality of different directions, here three directions by three CCD cameras (43). For example, the portion (A2) is picked up from the top by the second CCD camera (43) from the left in FIG. 6, is picked up from the upper left by the leftmost CCD camera (43), and the third CCD camera from the left ( The image is taken from diagonally above and to the right according to 43). Further, the portion (A1) near both headers (2) and (3) in the heat exchanger (1) has different directions depending on the CCD camera (43) at both ends and the CCD camera (43) adjacent thereto, in this case 3 Images are taken from the direction. That is, the portion (A1) is directly imaged from directly above by the leftmost CCD camera (43), and the reflection image by the plate-like reflecting member (47) of the portion (A1) is captured by the leftmost CCD camera (43). As a result, the image is taken obliquely from the upper left. The portion (A1) is imaged from the upper right side by the second CCD camera (43) from the left. Therefore, all parts (A1), (A2), (A3), and (A4) of the heat exchanger (1) are imaged from a plurality of directions, here three directions, by the CCD camera (43), and each part (A1) (A2) A plurality of (A3) and (A4), here three images are obtained.

  The image processing device (44) captures images of each part (A1) (A2) (A3) (A4) of the heat exchanger (1) from a plurality of directions, in this case, from three directions by all the CCD cameras (43). The obtained multiple parts (A1) (A2) (A3) (A4), here three monochrome images are subjected to gray processing and each monochrome image is divided into a plurality of dots (pixels). Information is binarized into a white portion and a black portion by a predetermined threshold value, and the number of black portions is counted. Further, the image processing device (44) calculates to add or average the number of black portions in the three monochrome images for each portion (A1) (A2) (A3) (A4) of the heat exchanger (1). The calculation result of the number of black portions is stored. Further, the image processing device (44) pressurizes the calculation result of the number of black portions in the state before supplying the high pressure air to the inside of the heat exchanger (1) by the high pressure air supply device (41) and pressurizing. Compare the calculation result of the number of black parts in the later state, determine the pressure resistance of the heat exchanger (1) based on the increased number of black parts after pressurization, and display the determination result on the operation and display device ( Output to 45).

  Next, a pressure resistance inspection method for the heat exchanger (1) using the pressure resistance inspection apparatus described above will be described.

  First, the heat exchanger (1) is held by the holding device (40), and light is irradiated to the heat exchanger (1) from below by the illumination (42). Next, the CCD camera (43) captures each part (A1) (A2) (A3) (A4) of the heat exchanger (1) as a monochrome image from a plurality of different directions, here three directions. The image signal obtained by the CCD camera (43) is output to the image processing device (44). The image processing device (44) is a CCD camera (43) that captures each part (A1) (A2) (A3) (A4) of the heat exchanger (1) from three directions (A1). ) (A2) (A3) (B) are subjected to gray processing, each monochrome image is divided into a plurality of dots (pixels), and gray processing is performed to obtain luminance information at each dot with a predetermined threshold. The black and white parts are binarized according to the value, the number of black parts is counted, and the black in the three monochrome images for each part (A1) (A2) (A3) (A4) of the heat exchanger (1) The calculation is performed so that the number of parts is added or averaged, and the calculation result of the number of black parts is stored.

  Here, each portion (A1) (A1) (A1) (A1) (A1) (A1) (A1) (A1) (A1) (A1) (A1) (A4) Since the three images A2), (A3), and (A4) are obtained, it is easy even if the corrugated fin (6) placed in the ventilation gap (5) is deformed to such an extent that it does not affect the ventilation performance. In addition, the pressure resistance of the heat exchanger (1) can be accurately inspected. That is, in each part (A1) (A2) (A3) (A4) of the heat exchanger (1), the connecting part (6c) of the corrugated fin (6) is inclined as shown in FIG. It does not significantly reduce the heat exchange performance by significantly increasing the ventilation resistance. However, when each of the portions (A1), (A2), (A3), and (A4) is captured from one direction by the CCD camera (43) to obtain an image, for example, the portion (A1) in FIG. ) To obtain an image directly from just above, or to obtain an image by taking an image from only diagonally upward to the right with the second CCD camera (43) from the left. If the image is obtained from only the diagonally upper left side by 43), or the image is obtained from only the diagonally upper right side by the third CCD camera (43), the part (A3) is third from the left side. The CCD camera (43) to capture the image from just above, or the fourth CCD camera (43) from the left to capture the image from only the upper right corner, and the part (A4) When the third CCD camera (43) from the left captures an image from only the upper left corner, The amount of light passing through the gap between the adjacent connecting portions (6c) of the corrugated fins (6) arranged in the gap (5) is insufficient, the number of black portions in each monochrome image becomes excessive, It may be determined that the ventilation performance is insufficient before the pressurization. On the other hand, when a plurality of CCD cameras (43), in this case, images each part (A1) (A2) (A3) (A4) from three directions to obtain three images, each part (A1) (A2 ) (A3) (A4) The number of binarized black portions in one or two monochrome images is excessive, but the number of binarized black portions in at least one monochrome image is reduced. For example, in the part (A3) of FIG. 6, the number of binarized black parts in the monochrome image obtained by imaging with the third and fourth CCD cameras from the left is excessive. The number of binarized black portions in the monochrome image obtained by imaging with the second CCD camera (43) from the left decreases. Therefore, the total or average of the number of binarized black portions in each of the portions (A1) (A2) (A3) (A4), here three monochrome images, is calculated, and the number of these black portions is calculated. If the ventilation performance is determined based on the result, it is not determined that the product is defective. In other words, in the heat exchanger (1) before pressurizing the inside, when a plurality of parts (A1), (A2), (A3), and (B) of the heat exchanger (1) are viewed from three directions, In at least one direction, a lot of light passes through the ventilation gap (5) between the adjacent flat heat exchange tubes (4).

  Next, either one of the inlet pipe (7) and the outlet pipe (8) is sealed, and high pressure air is supplied from the other into the heat exchanger (1) by the high pressure air supply device (41) to exchange heat. Pressurize the inside of the heat exchanger (1), and in the same way as above, use the CCD camera (43) to make each part (A1) (A2) (A3) (A4) of the heat exchanger (1) monochrome from three different directions. Three images of each part (A1), (A2), (A3), and (B) are obtained by taking an image, and an image signal is output to the image processing device (44). In the same way as before pressurization, the image processing device (44) performs binarized black in three monochrome images for each part (A1) (A2) (A3) (B) of the heat exchanger (1). Calculate the sum or average of the number of parts and store the number of these black parts.

  If the brazing part between the projections (19) and (20) for the reinforcing wall of the flat heat exchange pipe (4) is defective, or the brazing strength of the brazing part is insufficient In this case, when the inside of the heat exchanger (1) is pressurized, as shown in FIGS. 7 and 8, the internal joints between the tips of the reinforcing wall projections (19) and (20) are broken and both ends are destroyed. A relatively large gap is formed between the ridges (19) and (20), the flat heat exchange pipe (4) is greatly expanded, and the corrugated fin (6) disposed in the ventilation gap (5) is deformed. Even when viewed from the direction, the amount of light transmitted through the ventilation gap (5) decreases. Therefore, the number of black portions calculated by the image processing device (44) is significantly increased compared to the number of black portions calculated before pressing. In this case, the image processing device (44) compares the number of black portions after pressurization with the number of black portions before pressurization, and the increase in the number of black portions after pressurization is equal to or greater than a predetermined threshold value. Is determined to be a defective product having insufficient pressure resistance, and the determination result is displayed on the display device (45).

  Contrary to this, no brazing defects occurred in the brazed portions of the reinforcing wall projections (19) and (20) of the flat heat exchange pipe (4), and the brazed portions were brazed. When the strength is sufficiently high, even if the inside of the heat exchanger (1) is pressurized, the flat heat exchange pipe (4) hardly bulges and the corrugated fin (6) hardly deforms, whichever direction Even when viewed from above, the amount of light transmitted through the ventilation gap (5) hardly decreases even before pressurization. Therefore, the number of black portions calculated by the image processing device (44) hardly increases compared to the number of black portions calculated before pressurization, and the increase in black portions after pressurization is a predetermined number. Below threshold. In this case, the image processing device (44) determines that the product is excellent in pressure resistance and displays the determination result of the display device (45).

  In the above embodiment, the CCD camera (43) (imaging means) directly images the heat exchanger (1), but instead of this, a reflection image by the reflection means may be captured. In the above embodiment, a plurality of CCD cameras (43) having an angle of view are used as the imaging means. Instead, a plurality of cameras (imaging means) having lenses for converging parallel light are used. In use, these cameras may be arranged so that their optical axes are directed in different directions and the imaging ranges of adjacent imaging means partially overlap. As a lens for converging parallel light, for example, a telecentric lens is used.

  Moreover, the inspection apparatus of the said embodiment can also be utilized for the pressure | voltage resistant inspection method of the following heat exchangers (1).

  In this method, a plurality of hollow refrigerant circulation portions (flat heat exchange pipes (4)) having internal joints are provided in parallel, and a gap between adjacent refrigerant circulation portions (5) And the pressure resistance of the heat exchanger (1) in which the corrugated fins (6) are arranged in the ventilation gap (5), and from the one side in the ventilation direction of the heat exchanger (1) By irradiating light, the same part of the heat exchanger (1) on the opposite side of the ventilation direction of the heat exchanger (1) is imaged from a plurality of directions by an imaging means (CCD camera (43)). Obtain multiple images of the part, then pressurize the inside of the heat exchanger (1), and continuously or intermittently after the start of pressurization on the opposite side of the air flow direction of the heat exchanger (1) By capturing the same part of the same part from a plurality of directions with an imaging means (CCD camera (43)) Pressure resistance of the heat exchanger (1) based on continuous or intermittent change of luminance information of multiple images for the same part before pressurization and multiple image luminance information for the same part after pressurization It is to determine sex.

  In this method, the same part of the heat exchanger (1) is imaged from a plurality of directions by an imaging means (CCD camera (43)) to obtain a plurality of monochrome images of the same part, and gray processing is performed on each monochrome image. Each monochrome image is divided into a plurality of dots, luminance information at each dot is binarized into a white portion and a black portion by a predetermined threshold, and the number of black portions is counted, and before each image is pressed The pressure resistance of the heat exchanger (1) may be determined based on the number of black portions of the heat exchanger and the continuous or intermittent change in the number of black portions after pressurization. In this method, it is preferable to calculate so as to add or average the number of black portions in a plurality of monochrome images with respect to the same portion of the heat exchanger (1), and use this calculation result for pressure resistance determination.

  In the above method, the same part of the heat exchanger (1) is imaged from a plurality of directions by imaging means (CCD camera (43) to obtain a plurality of monochrome images of the same part, and each monochrome image is subjected to gray processing. Each monochrome image is divided into a plurality of dots, and luminance information at each dot is binarized into a white portion and a black portion according to a predetermined threshold, and a pattern of the white portion and the black portion in each image is extracted. The pressure resistance of the heat exchanger may be determined based on the pattern before pressurization by the pressurizing means and the continuous change or intermittent change of the pattern after pressurization.

  In the embodiment described above, the pressure resistance inspection device is used for the pressure resistance inspection of the heat exchanger (1) .In the above-described method, each part (A1) (A2) of the heat exchanger (1) is used. The ventilation performance of the heat exchanger (1) can be inspected based on the calculated number of black portions of each of the plurality of images before pressurization for (A3) and (A4). That is, the corrugated fin (6) is deformed before being pressed, or a large amount of flux used when brazing the flat heat exchange tube (4) and the corrugated fin (6) remains. If the ventilation gap (5) is closed, the number of black portions calculated above increases, so that it can be determined that the ventilation performance is not sufficient.

  Further, similarly to this, it is possible to determine the state of the corrugated fin alone before being incorporated into the heat exchanger.

It is a perspective view which shows one example of the heat exchanger by which pressure resistance is test | inspected with the method and apparatus of this invention. FIG. 2 is an enlarged cross-sectional view showing a flat heat exchange tube of the heat exchanger of FIG. 1. It is a figure which shows the method of manufacturing the flat heat exchange pipe | tube of FIG. It is a partial enlarged front view of the heat exchanger shown in FIG. It is a figure which shows schematic structure of embodiment of the pressure | voltage resistant test | inspection apparatus of the heat exchanger by this invention. It is the elements on larger scale of FIG. It is a figure equivalent to FIG. 4 which shows the state which the internal junction part of the flat heat exchange pipe | tube destroyed by pressurization inside a heat exchanger. It is the VIII-VIIii line expanded sectional view of FIG.

Explanation of symbols

(1): Heat exchanger
(4): Flat heat exchange pipe (refrigerant circulation part)
(5): Ventilation gap
(6): Corrugated fin
(6a): Wave peak
(6b): Wave bottom
(6c): Connection part
(40): Holding device (holding means)
(41): High-pressure air supply device (pressurizing means)
(42): Illumination (light irradiation means)
(43): CCD camera (imaging means)
(44): Image processing device (processing means)

Claims (40)

A method for inspecting a corrugated fin having a wave crest part, a wave bottom part and a connecting part that connects the wave crest part and the wave bottom part,
The corrugated fin is irradiated with light from one side in the width direction, and the same portion of the corrugated fin is similarly imaged on the opposite side by imaging means from a plurality of directions to obtain a plurality of images of the same portion. A corrugated fin inspection method, comprising: determining a state of a corrugated fin based on luminance information of a plurality of images. The corrugated fin inspection method according to claim 1, wherein the corrugated fin is imaged from a plurality of directions simultaneously by a plurality of imaging means. By capturing the same part of the corrugated fin from a plurality of directions with an imaging means, a plurality of monochrome images of the same part are obtained, and each monochrome image is subjected to gray processing, and each monochrome image is divided into a plurality of dots. The brightness information in the image is binarized into a white portion and a black portion by a predetermined threshold, the number of black portions is counted, and the state of the corrugated fin is determined based on the number of black portions in each image. 2. The corrugated fin inspection method according to 2. 4. The corrugated fin inspection method according to claim 3, wherein a calculation is performed such that the number of black portions in a plurality of monochrome images with respect to the same portion of the corrugated fin is added or averaged, and the calculation result is used to determine the state of the corrugated fin. An apparatus for inspecting a corrugated fin having a wave crest part, a wave bottom part, and a connecting part that connects the wave crest part and the wave bottom part,
A light irradiation means that is disposed on one side of the corrugated fin in the width direction and that irradiates the corrugated fin with light, and is disposed on the opposite side of the light irradiation means with the corrugated fin interposed therebetween, and images the same part of the corrugated fin from multiple directions An inspection apparatus for corrugated fins, comprising: imaging means for performing the processing, and processing means for determining the state of the corrugated fins based on luminance information of a plurality of images for the same portion of the corrugated fins obtained by the imaging means. 6. The corrugated fin inspection apparatus according to claim 5, wherein the plurality of imaging means having an angle of view are arranged such that the optical axes are parallel and the imaging ranges of adjacent imaging means partially overlap. 7. The corrugated fin inspection apparatus according to claim 6, wherein the imaging means is a CCD camera. 6. The corrugated fin inspection according to claim 5, wherein the plurality of imaging means having lenses for converging parallel light are arranged so that the optical axes are directed in different directions and the imaging ranges of adjacent imaging means partially overlap. apparatus. The processing means applies gray processing to a plurality of monochrome images of the same part obtained by imaging the same part of the corrugated fin from a plurality of directions by the imaging means and divides each monochrome image into a plurality of dots. 9. The luminance information in FIG. 5 is binarized into a white portion and a black portion according to a predetermined threshold, and the number of black portions is counted, and the state of the corrugated fin is determined based on the number of black portions. The corrugated fin inspection apparatus according to any one of the above. 10. The corrugated fin inspection according to claim 9, wherein the processing means calculates so as to add or average the number of black portions in a plurality of monochrome images with respect to the same portion of the corrugated fin, and uses the calculation result for determining the state of the corrugated fin. apparatus. 11. The corrugated fin inspection apparatus according to claim 5, wherein the processing means is an image processing apparatus. A plurality of hollow refrigerant circulation portions are provided in parallel, and a gap between adjacent refrigerant circulation portions is a ventilation gap, and a wave crest, a wave bottom, a wave crest and a wave bottom are provided in the ventilation gap. A method for inspecting the ventilation performance of a heat exchanger in which corrugated fins having connecting portions to be connected are arranged,
The heat exchanger is irradiated with light from one side in the ventilation direction, and the same part of the heat exchanger is similarly imaged on the opposite side by imaging means from a plurality of directions to obtain a plurality of images of the same part. A ventilation performance inspection method for a heat exchanger, wherein the ventilation performance of the heat exchanger is determined based on luminance information of a plurality of images. The ventilation performance inspection method for a heat exchanger according to claim 12, wherein imaging from a plurality of directions of the heat exchanger is performed simultaneously by a plurality of imaging means. The same part of the heat exchanger is imaged from a plurality of directions by an imaging means to obtain a plurality of monochrome images of the same part, and each monochrome image is subjected to gray processing and each monochrome image is divided into a plurality of dots. The luminance information in the dots is binarized into a white portion and a black portion by a predetermined threshold, and the number of black portions is counted, and the ventilation performance of the heat exchanger is determined based on the number of black portions in each image Item 14. A method for inspecting ventilation performance of a heat exchanger according to Item 12 or 13. The ventilation of the heat exchanger according to claim 14, wherein the calculation is performed such that the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger is added or averaged, and the calculation result is used to determine the ventilation performance of the heat exchanger. Performance inspection method. A plurality of hollow refrigerant circulation portions are provided in parallel, and a gap between adjacent refrigerant circulation portions is a ventilation gap, and a wave crest, a wave bottom, a wave crest and a wave bottom are provided in the ventilation gap. A device for inspecting the ventilation performance of a heat exchanger in which corrugated fins having connecting portions to be connected are arranged,
Light irradiation means arranged on one side of the heat exchanger in the ventilation direction and irradiating the heat exchanger with light, arranged on the opposite side of the light irradiation means across the heat exchanger, and the same part of the heat exchanger A heat exchanger comprising: imaging means for imaging from a plurality of directions; and processing means for determining the ventilation performance of the heat exchanger based on luminance information of a plurality of images for the same portion of the heat exchanger obtained by the imaging means Ventilation performance inspection device. The ventilation performance inspection device for a heat exchanger according to claim 16, wherein the plurality of imaging means having an angle of view are arranged such that the optical axes are parallel and the imaging ranges of adjacent imaging means partially overlap. The ventilation performance inspection device for a heat exchanger according to claim 17, wherein the imaging means comprises a CCD camera. 17. The heat exchanger according to claim 16, wherein the plurality of imaging units having lenses for converging parallel light are arranged so that the optical axes are directed in different directions and the imaging ranges of adjacent imaging units partially overlap. Ventilation performance inspection device. The processing means applies gray processing to a plurality of monochrome images of the same part obtained by imaging the same part of the heat exchanger from a plurality of directions by the imaging means and divides each monochrome image into a plurality of dots, The luminance information in the dots is binarized into a white portion and a black portion by a predetermined threshold, and the number of black portions is counted, and the ventilation performance of the heat exchanger is determined based on the number of black portions in each image Item 20. A ventilation performance inspection device for a heat exchanger according to any one of Items 16 to 19. 21. The heat according to claim 20, wherein the processing means calculates so as to add or average the number of black portions in the plurality of monochrome images with respect to the same portion of the heat exchanger, and uses the calculation result to determine the ventilation performance of the heat exchanger. Ventilation performance inspection device for exchangers. The ventilation performance inspection device for a heat exchanger according to any one of claims 16 to 21, wherein the processing means comprises an image processing device. A plurality of hollow refrigerant circulation portions having internal joint portions are provided in parallel, and a gap between adjacent refrigerant circulation portions is a ventilation gap, and a wave crest portion, a wave bottom portion, and a wave crest portion are provided in the ventilation gap. A method for inspecting the pressure resistance of a heat exchanger in which a corrugated fin having a connecting part that connects the wave bottom part is disposed,
The inside of the heat exchanger is pressurized, and before and after this pressurization, light is irradiated from one side of the ventilation direction of the heat exchanger, respectively, and the same part of the heat exchanger on the opposite side is also taken from a plurality of directions by the imaging means. A plurality of images of the same part are obtained by imaging, and the pressure resistance of the heat exchanger is determined based on luminance information of the plurality of images of the same part before and after the pressurization. Pressure resistance inspection method. 24. The heat exchanger pressure resistance inspection method according to claim 23, wherein imaging from a plurality of directions of the heat exchanger is performed simultaneously by a plurality of imaging means. The same part of the heat exchanger is imaged from a plurality of directions by an imaging means to obtain a plurality of monochrome images of the same part, and each monochrome image is subjected to gray processing and each monochrome image is divided into a plurality of dots. The luminance information in the dot is binarized into a white portion and a black portion with a predetermined threshold, and the number of black portions is counted, and the black portion after pressurization is compared with the number of black portions before pressurization in each image. The pressure resistance test method for a heat exchanger according to claim 23 or 24, wherein the pressure resistance of the heat exchanger is determined based on the increased number. 26. The heat pressure resistance testing method for a heat exchanger according to claim 25, wherein a calculation is performed so as to add or average the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger, and the calculation result is used for pressure resistance determination. A plurality of hollow refrigerant circulation portions having internal joint portions are provided in parallel, and a gap between adjacent refrigerant circulation portions is a ventilation gap, and a wave crest portion, a wave bottom portion, and a wave crest portion are provided in the ventilation gap. A method for inspecting the pressure resistance of a heat exchanger in which a corrugated fin having a connecting part that connects the wave bottom part is disposed,
Light is irradiated from one side of the ventilation direction of the heat exchanger, and the same part of the heat exchanger is imaged from a plurality of directions by the imaging means on the opposite side of the ventilation direction of the heat exchanger. Obtain an image, then pressurize the inside of the heat exchanger, and after the start of pressurization, continuously or intermittently image the same part of the heat exchanger on the opposite side of the ventilation direction of the heat exchanger from multiple directions by the imaging means To obtain a plurality of images of the same part, and continuously or intermittently change the luminance information of the plurality of images for the same part before pressurization and the luminance information of the plurality of images for the same part after pressurization. The pressure resistance test method for a heat exchanger is characterized in that the pressure resistance of the heat exchanger is determined based on the above. 28. The pressure resistance test method for a heat exchanger according to claim 27, wherein imaging from a plurality of directions of the heat exchanger is performed simultaneously by a plurality of imaging means. The same part of the heat exchanger is imaged from a plurality of directions by an imaging means to obtain a plurality of monochrome images of the same part, and each monochrome image is subjected to gray processing and each monochrome image is divided into a plurality of dots. Luminance information in a dot is binarized into a white portion and a black portion according to a predetermined threshold, and the number of black portions is counted, and the number of black portions before pressing in each image, and the black portion after pressing The pressure resistance test method for a heat exchanger according to claim 27 or 28, wherein the pressure resistance of the heat exchanger is determined based on a continuous change or intermittent change in the number. 30. The pressure resistance test method for a heat exchanger according to claim 29, wherein a calculation is performed so as to add or average the number of black portions in a plurality of monochrome images for the same portion of the heat exchanger, and the calculation result is used for pressure resistance determination. A plurality of hollow refrigerant circulation portions having internal joints are provided in parallel between a pair of headers spaced from each other, and a ventilation gap is provided between adjacent refrigerant circulation portions. An apparatus for inspecting the pressure resistance of a heat exchanger in which a corrugated fin having a wave crest part, a wave bottom part and a coupling part that connects the wave crest part and the wave bottom part is arranged in the ventilation gap,
Pressurization means for pressurizing the inside of the heat exchanger, light irradiation means for irradiating the heat exchanger with light disposed on one side in the ventilation direction of the heat exchanger, and opposite to the light irradiation means with the heat exchanger in between An imaging unit that is arranged on the side and that captures the same part of the heat exchanger from a plurality of directions to obtain a plurality of images, and a plurality of the same part obtained by the imaging unit before and after pressurization by the pressurization unit A heat exchanger pressure resistance inspection apparatus comprising: processing means for determining pressure resistance of the heat exchanger based on a change in luminance information of an image. 32. The pressure resistance inspection apparatus for a heat exchanger according to claim 31, wherein the plurality of imaging means having an angle of view are arranged such that the optical axes are parallel and the imaging ranges of adjacent imaging means partially overlap. The pressure resistance inspection apparatus for a heat exchanger according to claim 32, wherein the imaging means comprises a CCD camera. 32. The heat exchanger according to claim 31, wherein the plurality of imaging means having lenses for converging parallel light are arranged so that the optical axes are directed in different directions and the imaging ranges of adjacent imaging means partially overlap. Pressure-resistant performance inspection device. The processing means applies gray processing to a plurality of monochrome images of the same part obtained by imaging the same part of the heat exchanger from a plurality of directions by the imaging means and divides each monochrome image into a plurality of dots, Luminance information in dots is binarized into a white portion and a black portion by a predetermined threshold value, and the number of black portions is counted, and the pressure information after pressurization with respect to the number of black portions before pressurization by the pressurizing means in each image The pressure resistance test apparatus for a heat exchanger according to any one of claims 31 to 34, wherein the pressure resistance of the heat exchanger is determined based on the increased number of black portions. The processing means applies gray processing to a plurality of monochrome images of the same part obtained by imaging the same part of the heat exchanger from a plurality of directions by the imaging means and divides each monochrome image into a plurality of dots, Luminance information in a dot is binarized into a white portion and a black portion by a predetermined threshold, and the number of black portions is counted, and the number of black portions before pressing by the pressing means in each image, and after pressing The pressure resistance test | inspection apparatus of the heat exchanger in any one of Claims 31-34 which determines the pressure resistance of a heat exchanger based on the continuous change or the intermittent change of the number of black parts. 37. The heat exchanger according to claim 35 or 36, wherein the processing means calculates so as to add or average the number of black portions in a plurality of monochrome images with respect to the same portion of the heat exchanger, and uses the calculation result for determination of pressure resistance. Pressure resistance testing equipment. 38. The pressure resistance inspection apparatus for a heat exchanger according to any one of claims 31 to 37, wherein the processing means comprises an image processing apparatus. The heat exchanger manufacturing line provided with the ventilation performance test | inspection apparatus in any one of Claims 16-22 . A heat exchanger production line comprising the pressure resistance test apparatus according to any one of claims 31 to 38 .

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