JP2010216752A - Laminated metal plate, air conditioning device comprising the same, and method of manufacturing laminated metal plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated metal plate and its manufacturing method capable of shortening a joining time and obtaining sufficient joint strength. <P>SOLUTION: A bottom plate (laminated metal plate) 13 has a refrigerant pathway 11 inside thereof. The bottom plate 13 includes a lower metal plate 15 having a first groove section 19 recessed downward, and a first recessed section 21 disposed along a peripheral edge of the first groove section 19 and recessed upward, and an upper metal plate 17 stacked on an upper side of the lower metal plate 15, and having a second groove section 23 recessed upward at a position opposed to the first groove section 19 of the lower metal plate 15, and configuring the refrigerant pathway 11 with the first groove section 19. The lower metal plate 15 is welded to the upper metal plate 17 along the peripheral edge of the first groove section 19 between the first recessed section 21 and the first groove section 19. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a laminated metal plate having a fluid passage between laminated metal plates, an air conditioner including the laminated metal plate, and a method of manufacturing the laminated metal plate.

  Generally, in an outdoor unit of an air conditioner, a compressor, a heat exchanger, an expansion valve, a four-way switching valve, and the like are disposed in a casing, and these are connected by a plurality of refrigerant pipes made of copper pipes. These refrigerant pipes are bent and arranged in a complicated shape in the casing in order to make the outdoor unit compact. With such an arrangement, there is a problem that the piping connection work is complicated.

  Thus, for example, Patent Document 1 discloses an air conditioner in which two brazing sheets are joined to form a refrigerant passage therein. Each brazing sheet in Patent Document 1 is obtained by forming a brazing material layer having a melting point lower than that of an aluminum substrate by mixing aluminum and silicon on one surface of the aluminum substrate. According to this air conditioner, it is said that the installation space of the refrigerant passage can be reduced, and piping connection work can be simplified.

Japanese Patent Laid-Open No. 08-178368

  However, in the invention described in Patent Document 1, since the two brazing sheets formed with the brazing material layer are heated in the furnace to produce a laminated metal plate having a refrigerant passage by joining each other, In order to obtain sufficient bonding strength to prevent refrigerant leakage, it was necessary to lengthen the heating time in the furnace.

  Therefore, the present invention has been made in view of such points, and the object of the present invention is to provide a laminated metal plate capable of reducing the bonding time and obtaining sufficient bonding strength, and an air conditioner equipped with the same. The present invention also provides a method for manufacturing a laminated metal plate.

  The laminated metal plate of the present invention has a fluid passage (11) therein. This laminated metal plate includes a first metal plate (15) and a second metal plate (17). The first metal plate (15) is provided along a first groove (19) that is recessed on one side in the thickness direction, and a periphery of the first groove (19), and is recessed on one side or the other side in the thickness direction. And a recess (21). The second metal plate (17) is laminated on the other side in the thickness direction of the first metal plate (15). The second metal plate (17) is recessed on the other side in the thickness direction at a position facing the first groove (19) of the first metal plate (15), and the fluid passage together with the first groove (19). It has the 2nd groove part (23) which constitutes (11). The first metal plate (15) is welded to the second metal plate (17) along the periphery of the first groove (19) between the recess (21) and the first groove (19). Has been.

  In this configuration, the laminated metal plate is produced by welding the first metal plate (15) and the second metal plate (17) along the periphery of the first groove portion (19). Compared with the case where two brazing sheets having a brazing filler metal layer are heated and joined in a furnace, the joining time can be greatly reduced.

  By the way, in order to produce a metal plate having a groove, such as the first metal plate (15) and the second metal plate (17), press working is performed in which a sheet metal is sandwiched between a pair of molds. The pressed first metal plate (15) and second metal plate (17) are welded at a flat portion near the groove. At the time of this welding, it is preferable that the first metal plate (15) and the second metal plate (17) are in surface contact in a wide range at the flat portion.

  However, when the groove is formed by pressing, the pressure applied during pressing tends to vary near the boundary between the groove and the flat portion in the vicinity thereof. When variations occur in the pressure near the boundary, the shape near the boundary after press working also varies. If the shape near this boundary varies, the range in which the first metal plate (15) and the second metal plate (17) contact will also vary, and as a result, the degree of joining between the metal plates after welding also varies. Will occur.

  Therefore, in this configuration, a concave portion that is recessed on one side or the other side in the thickness direction is provided at a position along the periphery of the first groove portion (19) of the first metal plate (15), and the concave portion (21) and the first groove portion ( 19) by welding the first metal plate (15) to the second metal plate (17) along the peripheral edge of the first groove portion (19), the degree of joining of the metal plates is stabilized, and sufficient Bonding strength is obtained.

  That is, at the time of press working to produce the first metal plate (15), the sheet metal is pressed between a pair of molds, and the first groove (19), the recess (21), and a flat portion positioned between them. Is formed. At the time of this pressing, the first groove portion (19) is formed in a state in which the portion for forming the concave portion of the entire mold constrains the position along the periphery of the first groove portion (19) in the sheet metal. Compared with the conventional press work without a mold part for forming the recess (21), the magnitude of the pressure applied near the boundary between the first groove part (19) and the flat part is stabilized. Thereby, since the variation in the pressure applied to the vicinity of the boundary can be reduced, the shape variation in the vicinity of the boundary of the first metal plate (15) after the press working can be reduced. Therefore, when this 1st metal plate (15) is laminated | stacked on a 2nd metal plate (17), the range which a 1st metal plate (15) and a 2nd metal plate (17) contact can be stabilized. As a result, the degree of joining between the first metal plate (15) and the second metal plate (17) after welding can be stabilized, so that desired joining strength can be obtained.

  As described above, according to this configuration, it is possible to obtain a bonding strength sufficient to shorten the bonding time and prevent leakage of the refrigerant.

  In the present invention, the concave portion is a first concave portion (21), and the second metal plate (17) is provided along a peripheral edge of the second groove portion (23) and is concave on the other side in the thickness direction. It preferably has two recesses (25).

  In this configuration, the concave portions (21, 25) are provided along the peripheral edges of both the first groove portion (19) of the first metal plate (15) and the second groove portion (23) of the second metal plate (17). Therefore, not only the first metal plate (15) but also the shape variation near the boundary of the second metal plate (17) can be reduced. Thereby, the joining degree of a 1st metal plate (15) and a 2nd metal plate (17) can be stabilized further.

  The first recess (21) is preferably provided at a position facing the second recess (25), is recessed on the other side in the thickness direction, and is disposed in the second recess (25).

  In this configuration, the first recess (21) is recessed on the same side as the second recess (25) (the other side in the thickness direction). In other words, the surface of the other side of the first recess (21) protrudes to the other side in the thickness direction. The protruding portion of the first recess (21) is disposed in the second recess (25). Thus, since the 1st crevice (21) is arranged in the 2nd crevice (25), these crevices (21, 25) are the 1st metal plate (15) and the 2nd metal plate (17). ) To position.

  The first recess (21) is formed in a groove shape so as to continuously surround the periphery of the first groove (19), and the second recess (25) is formed on the second groove (23). It is preferably formed in a groove shape so as to continuously surround the periphery.

  In this structure, since each recessed part (21, 25) is formed in a groove shape so as to continuously surround the periphery of each groove part (19, 23), the shape of the first groove part (19) near the boundary and Variations in the shape of the second groove portion (23) in the vicinity of the boundary are reduced over substantially the entire periphery of each groove portion (19, 23). Thereby, the joining degree of a 1st metal plate (15) and a 2nd metal plate (17) can be stabilized more.

  The plurality of first recesses (21) are provided so as to be scattered along the periphery of the first groove portion (19), and the second recess (25) is the periphery of the second groove portion (23). It is preferable that a plurality are provided so as to be scattered along the line.

  In this configuration, a plurality of first recesses (21) and second recesses (25) are provided so as to be scattered along the periphery of each groove (19, 23). There will be more than one. Thereby, the shift | offset | difference of the lamination position of a 1st metal plate (15) and a 2nd metal plate (17) is suppressed more.

  The first metal plate (15) is welded to the second metal plate (17) at a position near the first groove (19) between the recess (21) and the first groove (19). In such a case, the cross section of the fluid passage (11) has a more circular shape than the case where two brazing sheets are joined using a brazing material.

  That is, when the groove is formed by pressing, the shape near the boundary between the groove and the flat portion in the vicinity thereof tends to be a smooth curved surface instead of an angular shape. When two brazing sheets are joined with a brazing material to form a fluid passage as in the prior art, the heating temperature in the furnace is adjusted to a temperature at which the brazing material melts, and the metal plate itself hardly melts. Therefore, the smooth curved surface after the press working remains as it is in the shape after brazing near the boundary between the groove portion constituting the fluid passage and the flat portion in the vicinity thereof. In the cross section of the fluid passage thus obtained, both sides in the thickness direction have an arc shape, but both sides in the width direction have a radius larger than an ideal circular cross section because of the smooth curved surface shape near the boundary. The gap extends outward in the direction.

  On the other hand, in this configuration, the welding location is adjusted to a position near the groove (19) between the recess (21) and the groove (19). In addition, a portion of the vicinity of the boundary is melted, and welding is performed in a state in which the gap extending outward in the radial direction is reduced by the pressure pressed in the thickness direction during welding. In the cross section of the fluid passage (11) obtained in this way, a part of the gap extending outward in the radial direction is filled by the deformation, so that the cross section of the fluid passage (11) becomes closer to a circle. Thereby, the pressure loss at the time of the fluid flowing through the fluid passage (11) can be reduced.

  The first metal plate (15) may be welded to the second metal plate (17) at a position near the recess (21) between the recess (21) and the first groove (19). .

  As described above, when the first metal plate (15) and the second metal plate (17) are welded, the first metal plate (15) and the second metal plate (17) are melted at the welding location by the heat during welding. To do. Therefore, this configuration is particularly suitable when the thickness of the first metal plate (15) and / or the second metal plate (17) is thin. That is, in this configuration, by adjusting the welding location to a position closer to the recess (21) between the recess (21) and the first groove (19), in other words, a position away from the groove (19). The temperature rise of the groove portions (19, 23) due to heat during welding can be suppressed. Thereby, since it can suppress that the 1st groove part (19) and 2nd groove part (23) which comprise the fluid channel | path (11) melt | dissolve at the time of welding, it can suppress that these thickness becomes still smaller. Thereby, since durability of the groove part (19, 23) which comprises the fluid flow path (11) can be improved, reliability improves further.

  The air conditioning apparatus of the present invention includes the laminated metal plate (13). In this air conditioner, the fluid passage (11) serves as a refrigerant passage.

  The method of the present invention is a method for producing a laminated metal plate having a fluid passage (11) therein. This method includes a first groove portion (19) recessed on one side in the thickness direction and a recess portion (21) provided along the periphery of the first groove portion (19) and recessed on one side or the other side in the thickness direction. A first metal plate (15) formed by pressing and a second metal plate (17) having a second groove (23) recessed on the other side in the thickness direction formed by pressing the second metal Laminating so that the plate (17) is located on the other side in the thickness direction of the first metal plate (15) and the first groove portion (19) and the second groove portion (23) are opposed to each other; The first metal plate (15) and the second metal plate (17) that are laminated are arranged between the concave portion of the first metal plate (15) and the first groove portion (19). And (19) welding by laser welding or seam welding along the periphery. That.

  In this method, the laminated first metal plate (15) and second metal plate (17) are welded by laser welding or seam welding along the peripheral edge of the first groove portion (19). Time can be shortened.

  Moreover, since the 1st metal plate (15) shape | molded by press work has a 1st groove part (19) and the recessed part (21) provided along the periphery of this 1st groove part (19). As described above, the shape variation near the boundary between the first groove portion (19) and the flat portion in the vicinity thereof is reduced. Therefore, the mutual contact state when the first metal plate (15) and the second metal plate (17) are laminated in the lamination step is stabilized. Thereby, a 1st metal plate (15) and a 2nd metal are welded by welding the site | part between a recessed part (21) and a 1st groove part (19) along the periphery of a 1st groove part (19) at a welding process. Since the degree of joining with the plate (17) can be stabilized, desired joining strength can be obtained.

  In the method of the present invention, the concave portion is a first concave portion (21), the second metal plate (17) is provided along a peripheral edge of the second groove portion (23), and the first concave portion ( 21) and a second recess (25) formed by pressing so as to be recessed on the same side in the thickness direction, and in the laminating step, the first recess (21) and the second recess (25) It is preferable that one of the first metal plate (15) and the second metal plate (17) is aligned by placing one in the other recess.

  In this method, in the laminating step, the first recess (21) and the second recess (25) are engaged to align the first metal plate (15) and the second metal plate (17). The positioning accuracy between the first metal plate (15) and the second metal plate (17) can be further improved.

  As described above, according to the present invention, it is possible to obtain a bonding strength sufficient to reduce the bonding time and prevent leakage of the refrigerant.

It is a lineblock diagram showing a schematic structure of an air harmony device concerning a 1st embodiment of the present invention. (A) is a top view which shows the upper metal plate which comprises the bottom plate in the outdoor unit of the air conditioner of 1st Embodiment, (b) is a top view which shows the lower metal plate which comprises the bottom plate. It is a top view which shows the baseplate in 1st Embodiment. (A) is the IVA-IVA sectional view taken on the line of Fig.2 (a), (b) is the IVB-IVB sectional view taken on the line of FIG.2 (b). It is a top view which shows the refrigerant | coolant channel | path of the bottom plate in the outdoor unit of 1st Embodiment, the recessed part provided in the periphery, and the welding location, (b) is the VB-VB sectional view taken on the line of (a), (c) FIG. 5B is an enlarged cross-sectional view of a region surrounded by a dot-dash line circle in FIG. It is a block diagram which shows the outline of the seam welding machine for manufacturing the baseplate of 1st Embodiment. (A) is a top view which shows the upper metal plate which comprises the bottom plate in the outdoor unit of the air conditioner concerning 2nd Embodiment of this invention, (b) is the top which shows the lower metal plate which comprises the bottom plate FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a top view which shows the refrigerant | coolant channel | path of the bottom plate in the outdoor unit of 3rd Embodiment of this invention, the recessed part provided in the periphery, and the welding location, (b) is the IXB-IXB sectional view taken on the line of (a), (C) is sectional drawing to which the area | region enclosed with the dashed-dotted line circle of (b) was expanded. (A)-(c) is sectional drawing which each shows the recessed part of the baseplate in this invention, and its peripheral modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
As shown in FIG. 1, the air conditioner 71 according to the present embodiment includes an indoor unit 95 and an outdoor unit 73. In this air conditioner 71, a heat exchanger 99 disposed in an indoor unit 95 and a compressor 75, a heat exchanger 77, and an expansion valve 79 disposed in an outdoor unit 73 are connected to each other by a refrigerant pipe. Constitutes a circulating refrigerant circuit. The air conditioner 71 can switch between a cooling operation and a heating operation by switching the flow direction of the refrigerant by a four-way switching valve 87 disposed in a part of the refrigerant pipe of the refrigerant circuit. The indoor unit 95 and the outdoor unit 73 are provided with blowers 97 and 81, respectively.

  The indoor unit 95 and the outdoor unit 73 are each provided with a box-shaped casing (not shown). Each casing has a rectangular bottom plate on which the heat exchangers 99 and 77 and the like are placed, a top plate disposed above the bottom plate, and a top plate and a bottom plate that are erected upward from a peripheral portion of the bottom plate. And side plates that block the side portions between the two.

  2A is a plan view showing the upper metal plate 17 constituting the bottom plate 13 in the outdoor unit 73, and FIG. 2B is a plan view showing the lower metal plate 15 constituting the bottom plate 13, FIG. 3 is a plan view showing the bottom plate 13. 4A is a cross-sectional view taken along line IVA-IVA in FIG. 2A, and FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG.

  Thus, the bottom plate 13 of the casing of the outdoor unit 73 includes the lower metal plate 15 shown in FIG. 2A and the upper metal plate 17 shown in FIG. 2B, and is located above the lower metal plate 15. The upper metal plate 17 is laminated, and is a laminated metal plate integrated by welding.

  As shown in FIG. 2B and FIG. 4B, the lower metal plate 15 has a first groove portion 19 that is recessed in the thickness direction. As shown in FIGS. 2A and 4A, the upper metal plate 17 is recessed in the thickness direction at a position facing the first groove portion 19 of the lower metal plate 15. The first groove portion 19 is recessed downward, and the second groove portion 23 is recessed upward. The first groove portion 19 and the second groove portion 23 have an arc shape in cross section. For this reason, the refrigerant passage 11 is formed by overlapping the lower metal plate 15 and the upper metal plate 17. The bottom plate 13 has a plurality of refrigerant passages 11 between the lower metal plate 15 and the upper metal plate 17.

  Each refrigerant passage 11 is configured by a space surrounded by the first groove portion 19 of the lower metal plate 15 and the second groove portion 23 of the upper metal plate 17. Each refrigerant passage 11 is provided with a connecting portion 27 provided on the upper metal plate 17 in the vicinity of both ends in the passage formation direction. One end of a refrigerant pipe (not shown) is joined to these connecting portions 27 by means such as welding. The refrigerant passage 11 and the refrigerant pipe communicate with each other. Each refrigerant pipe is erected from the connecting portion 27 and is bent in the casing as necessary, and the other end is connected to the heat exchanger 77, the compressor 75, the four-way switching valve 87 and the like described above. Is done. A refrigerant circuit capable of circulating the refrigerant through the refrigerant passage 11 and the refrigerant pipe is configured.

  As shown in FIG. 4B, the lower metal plate 15 is provided along the peripheral edge of each first groove portion 19 and is recessed on the opposite side (upper side) from the first groove portion 19 in the thickness direction. 21. As shown in FIG. 2B, each first recess 21 is provided in a groove shape so as to continuously surround the periphery along the periphery of the first groove portion 19. The first recess 21 has an arc shape in cross section. The concave dimension in the thickness direction of the first concave portion 21 is smaller than the concave dimension in the thickness direction of the first groove portion 19.

  The 1st groove part 19 and the 1st recessed part 21 are formed at predetermined intervals required for seam welding. A part or all of the first groove portion 19 and the first concave portion 21 serve as a welding location, and a facing portion 31 is provided to face a welding location of the upper metal plate 17 described later. At least a part of the upper surface of the facing portion 31 (the surface facing the upper metal plate 17) is formed in a planar shape.

  As shown in FIG. 4A, the upper metal plate 17 is provided along the peripheral edge of each second groove 23, and has a second recess 25 that is recessed on the same side (upper side) as the second groove 23 in the thickness direction. Have. Each 2nd recessed part 25 is provided in groove shape so that this periphery may be surrounded continuously along the periphery of the 2nd groove part 23, as shown to Fig.2 (a). The second recess 25 has an arc shape in cross section. The recess dimension in the thickness direction of the second recess 25 is smaller than the recess dimension of the second groove 23 in the thickness direction.

  Similar to the lower metal plate 15, the second groove 23 and the second recess 25 are formed at a predetermined interval required for seam welding. A part or the whole of the second groove 23 and the second recess 25 serves as a welding location, and a facing portion 33 is provided to face the welding location of the lower metal plate 15 described above. At least a part of the lower surface of the facing portion 33 (the surface facing the lower metal plate 15) is formed in a planar shape. However, if the predetermined width required for seam welding can be ensured, and the facing portion 31 and the facing portion 33 can partially contact each other at the welding location, the facing portions 31 and 33 are entirely curved. It may be formed.

  As shown in FIGS. 5B and 5C, each first recess 21 is provided at a position facing each second recess 25. The upper metal plate 17 is laminated on the lower metal plate 15 in a state where the first recesses 21 are disposed in the opposing second recesses 25. The facing portion 31 of the lower metal plate 15 and the facing portion 33 of the upper metal plate 17 are arranged to face each other, and part or all of these are in surface contact.

  As shown in FIG. 5A, the lower metal plate 15 is welded to the upper metal plate 17 along the periphery of the first groove portion 19 between the first recess 21 and the first groove portion 19. That is, a part or all of the facing portions 31 and 33 arranged to face each other as described above serve as a welded portion of the lower metal plate 15 and the upper metal plate 17. In this embodiment, as shown in FIG. 5A, the welding location is a position near the second recess 25 between the second recess 25 and the second groove 23 (with the first recess 21 and the first groove 19. (Position close to the first concave portion 21).

  Since the concave dimension in the thickness direction of the first concave portion 21 is smaller than the concave dimension in the thickness direction of the first groove portion 19, as shown in FIG. The boundary region K2 with the portion 31 tends to have a smaller variation in shape than the boundary region K1 between the first groove portion 19 and the facing portion 31. Therefore, when the lower metal plate 15 and the upper metal plate 17 are laminated, the region where the upper surface of the facing portion 31 and the lower surface of the facing portion 33 are in surface contact is more on the boundary region K2 side than on the boundary region K1 side. Easy to grow. Therefore, when the lower metal plate 15 is welded to the upper metal plate 17 at a position near the first recess 21 between the first recess 21 and the first groove portion 19, a portion having a larger contact area with each other. Since it can be welded, the joint strength can be further improved.

  As shown in FIG. 5 (c), the width W of the facing portions 31 and 33 is such that the lower metal plate 15 and the upper metal plate 17 have a width in order to secure a certain bonding width by seam welding and obtain a desired bonding strength. It is preferable that it is 1/2 or more of thickness t. The upper limit of the width W is not particularly limited, but is preferably set to a small value in terms of enhancing the effect of reducing the shape variation near the boundary K1. Therefore, considering that a joining width can be secured by seam welding, the upper limit of the width W is preferably smaller than 10 times the width of the nugget 76 generated by welding, and smaller than 5 times the width of the nugget 76. More preferably it is a value.

  Next, a method for manufacturing the bottom plate 13 will be described. As shown in FIG. 6, in this embodiment, a seam welding apparatus 100 is used for manufacturing the bottom plate 13. First, the seam welding apparatus 100 will be described. The seam welding apparatus 100 includes a pair of roller electrodes 71 and 73, a pressure device 75 that pressurizes the roller electrode 71, a power supply device 79 that supplies power to the pressure device 75 and the roller electrodes 71 and 73, And a control unit (not shown) for controlling the operation of the part.

  The roller electrode 71 and the roller electrode 73 have a disk shape and have rotating shafts 72 and 74 at the centers, respectively. The rotating shaft 72 and the rotating shaft 74 are disposed substantially parallel to each other.

  A motor (not shown) is connected to each of the rotating shafts 72 and 74, and is supported by a support base (not shown) so as to be rotatable around the axis. The motor is connected to a power supply device 79. The roller electrode 71 and the roller electrode 73 rotate in opposite directions. For example, in FIG. 6, the roller electrode 71 rotates counterclockwise, and the roller electrode 73 rotates clockwise. The roller electrode 71 is supported by a support base so as to be movable in the direction approaching the roller electrode 73 and in the opposite direction (the vertical direction in FIG. 6). These roller electrodes 71 and 73 are connected to a power supply device 79, and electric power is supplied by the power supply device 79 during seam welding. In addition, although the structure which only the roller electrode 71 moves to an up-down direction like this embodiment may be sufficient, the structure to which both roller electrodes 71 and 73 move to an up-down direction may be sufficient.

  The pressurizing device 75 includes a cylindrical cylinder 78, a piston 77 disposed inside the cylinder 78, and a pump (not shown) that generates energy such as air pressure and hydraulic pressure. When power is supplied from the power supply device 79, the pressurizing device 75 drives the pump to slide the piston 77 in a predetermined direction in the cylinder 78. Thereby, the roller electrode 71 is pressurized. The pressed roller electrode 71 moves toward the roller electrode 73 and pressurizes the laminated body of the lower metal plate 15 and the upper metal plate 17 disposed between the roller electrodes 71 and 73 in the thickness direction.

  Next, each manufacturing process will be described. In FIG. 6, the lower metal plate 15 and the upper metal plate 17 are shown in cross section in order to show the welding locations (locations where the nuggets 76 are formed).

  First, the lower metal plate 15 and the upper metal plate 17 are produced in a press working process. In this pressing process, the lower metal plate 15 and the upper metal plate 17 are formed using, for example, a press machine having a pair of metal molds arranged vertically. The pair of molds are respectively formed so as to correspond to the shape and part of the first groove portion 19 of the lower metal plate 15, the first recess portion 21 or the second groove portion 23 of the upper metal plate 17, and the second recess portion 25. .

  Using this press machine, a lower metal plate 15 formed with a first groove 19 recessed downward and a first recess 21 provided along the periphery of the first groove 19 and recessed upward, The upper metal plate 17 formed with the second groove portion 23 recessed toward the side and the second recess portion 25 provided along the periphery of the second groove portion 23 and recessed upward is formed.

  Next, the lower metal plate 15 and the upper metal plate 17 obtained in the pressing process are laminated. In this lamination step, the lamination is performed so that the upper metal plate 17 is positioned above the lower metal plate 15 and the first groove portion 19 and the second groove portion 23 corresponding thereto are opposed to each other.

  In this embodiment, the 1st recessed part 21 and the 2nd recessed part 25 are provided in the position which mutually opposes, and are dented in the same side (upper side) of the thickness direction. And the 1st recessed part 21 is adjusted to the dimension which can be arrange | positioned in the 2nd recessed part 25 from the downward side. That is, the first recess 21 and the second recess 25 also serve to position the lower metal plate 15 and the upper metal plate 17. Therefore, in this stacking step, the lower metal plate 15 and the upper metal plate 17 may be stacked in a state where the corresponding positions of the first recess 21 and the second recess 25 are aligned.

  Next, the lower metal plate 15 and the upper metal plate 17 that are stacked in the stacking process are supplied between the roller electrodes 71 and 73 and pressed in the thickness direction by the roller electrodes 71 and 73 along the longitudinal direction. Sent. At this time, current is supplied through the roller electrodes 71 and 73, and the metal plates are seam welded between the roller electrodes 71 and 73. A nugget 76 is formed at the welded portion as shown in FIG. Thereby, the bottom plate 13 in which the lower metal plate 15 and the upper metal plate 17 are integrated is obtained.

  The seam welding conditions include pressure applied by the roller electrodes 71 and 73, energization time, rest time, current value during welding, welding speed (feed speed), electrode shape, and the like. It is set as appropriate according to the intended use. In addition, in the seam welding of this embodiment, the intermittent welding which repeats electricity supply and a pause may be sufficient, and the continuous welding which energizes continuously may be sufficient.

  As described above, in the first embodiment, the lower metal plate 15 includes the first groove portion 19 that is recessed downward, and the first recess portion 21 that is provided along the periphery of the first groove portion 19 and is recessed upward. And have. The upper metal plate 17 is laminated on the upper side of the lower metal plate 15. The upper metal plate 17 has a second groove portion 23 that is recessed upward at a position facing the first groove portion 19 of the lower metal plate 15 and constitutes the refrigerant passage 11 together with the first groove portion 19. The lower metal plate 15 is seam welded to the upper metal plate 17 along the periphery of the first groove portion 19 between the first recess 21 and the first groove portion 19.

  In the first embodiment having such a configuration, the bottom plate 13 is manufactured by seam welding the lower metal plate 15 and the upper metal plate 17 along the peripheral edge of the first groove portion 19. Compared with the case where two brazing sheets having a brazing filler metal layer are heated and joined in a furnace, the joining time can be greatly reduced.

  In the first embodiment, a first recess 21 that is recessed upward is provided at a position along the periphery of the first groove 19 of the lower metal plate 15, and between the first recess 21 and the first groove 19. By welding the lower metal plate 15 to the upper metal plate 17 along the periphery of the first groove portion 19, the degree of bonding between the metal plates is stabilized and sufficient bonding strength is obtained.

  That is, at the time of press working for producing the first metal plate 15, the sheet metal is pressed between the pair of dies to form the first groove portion 19, the first concave portion 21, and the flat portion located therebetween. At the time of this pressing, the first groove portion 19 is formed in a state in which the portion for forming the concave portion 21 of the entire mold constrains the position along the peripheral edge of the first groove portion 19 in the sheet metal. Compared with the conventional press work without a mold part to be formed, the magnitude of the pressure applied to the boundary region K1 between the first groove 19 and the facing part 31 is stabilized. Thereby, since the dispersion | variation in the pressure concerning the boundary area | region K1 can be reduced, the shape dispersion | variation in the boundary area | region K1 of the lower metal plate 15 after a press work can be reduced. Therefore, the range in which the lower metal plate 15 and the upper metal plate 17 are in contact with each other when the lower metal plate 15 is laminated on the upper metal plate 17 can be stabilized. As a result, the degree of joining between the lower metal plate 15 and the upper metal plate 17 after welding can be stabilized, so that desired joining strength can be obtained.

  Therefore, according to the first embodiment, it is possible to obtain a bonding strength sufficient to reduce the bonding time and prevent the leakage of the refrigerant.

  In the first embodiment, the upper metal plate 17 has a second recess 25 provided along the periphery of the second groove 23 and recessed upward. That is, since the concave portions are provided along the peripheral edges of both the first groove portion 19 of the lower metal plate 15 and the second groove portion 23 of the upper metal plate 17, both the lower metal plate 15 and the upper metal plate 17 are provided. The variation in shape near the boundary can be reduced. Thereby, the joining degree of the lower metal plate 15 and the upper metal plate 17 can be further stabilized.

  In the first embodiment, the first recess 21 is provided at a position facing the second recess 25, is recessed upward, and is disposed in the second recess 25. Thus, since the 1st recessed part 21 is a form arrange | positioned in the 2nd recessed part 25, these recessed parts 21 and 25 play the role which positions the lower metal plate 15 and the upper metal plate 17. As shown in FIG.

  In the first embodiment, the first concave portion 21 is formed in a groove shape so as to continuously surround the peripheral edge of the first groove portion 19, and the second concave portion 25 is continuous with the peripheral edge of the second groove portion 23. The shape of the first groove portion 19 in the vicinity of the boundary and the shape of the second groove portion 23 in the vicinity of the boundary are reduced in variation over almost the entire periphery of each groove portion. Yes. Thereby, the joining degree of the lower metal plate 15 and the upper metal plate 17 can be made more stable.

  In the first embodiment, the lower metal plate 15 is welded to the upper metal plate 17 at a position near the first concave portion 21 between the first concave portion 21 and the first groove portion 19. It can suppress that the 1st groove part 19 and the 2nd groove part 23 which comprise are melt | dissolving at the time of welding. Thereby, since it can suppress that the thickness of the 1st groove part 19 and the 2nd groove part 23 becomes small, durability of a refrigerant | coolant flow path improves.

<Second Embodiment>
FIG. 7 shows a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same component as 1st Embodiment here, and the detailed description is abbreviate | omitted.

  In the second embodiment, a plurality of first recesses 21 are provided so as to be scattered along the periphery of the first groove portion 19. A plurality of the second recesses 25 are provided so as to be scattered along the peripheral edge of the second groove 23 at a position facing each first recess 21.

  As shown in FIG. 8, each 1st recessed part 21 is arrange | positioned inside the 2nd recessed part 25 of the position which opposes. Therefore, in this 2nd Embodiment, the 1st recessed part 21 and the 2nd recessed part 25 which oppose have each performed the positioning function. As described above, the presence of a plurality of positioning portions further suppresses the shift in the stacking position between the lower metal plate 15 and the upper metal plate 17.

  Other configurations, operations, and effects are the same as those in the first embodiment although the description thereof is omitted.

<Third Embodiment>
9 (a) to 9 (c) show a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same component as Embodiment 1 here, and the detailed description is abbreviate | omitted.

  In the third embodiment, the upper metal plate 17 is welded to the lower metal plate 15 at a position near the second groove 23 between the second recess 25 and the second groove 23. In the third embodiment, as shown in FIG. 9A, the welding location (location where the nugget 76 is formed) is a position near the groove 23 between the second recess 25 and the second groove 23 ( (The position near the groove 19 between the first recess 21 and the first groove 19), compared with the case where two brazing sheets are joined using brazing material, the cross section of the refrigerant passage is The shape is more circular.

  That is, in the third embodiment, at the time of welding, a boundary region K1 between the groove portions 19 and 23 and the opposing portions 31 and 33 in the vicinity thereof is partially melted and deformed and welded. In the cross section of the refrigerant passage 11 obtained by this, the boundary region K1 is deformed and welded as described above, so that a part of the gap extending outward in the radial direction is filled. It becomes close to a circle. Thereby, the pressure loss at the time of the fluid flowing through the refrigerant passage 11 can be reduced.

  Other configurations, operations, and effects are the same as those in the first embodiment although the description thereof is omitted.

<Other embodiments>
Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the spirit of the present invention. For example, a form as shown to Fig.10 (a)-(c) may be sufficient. In the form shown in FIG. 10A, the upper metal plate 17 is provided with a through hole 29 formed at a position facing the first recess 21 instead of the second recess 25 of the first embodiment. The first recess 21 is fitted in the through hole 29.

  Further, in the embodiment shown in FIG. 10B, the recess 25 is provided only in the upper metal plate 17. In the form shown in FIG. 10C, the lower metal plate 15 has a first recess 21 that is recessed downward, and the upper metal plate 17 has a second recess 25 that is recessed upward. Even in these cases, the shape variation near the boundary between the groove portions 19 and 23 and the facing portions 31 and 33 can be reduced.

  In the above-described embodiment, the case where seam welding is used as a method for welding the lower metal plate and the upper metal plate has been described as an example. However, laser welding can be used instead of seam welding. Even in the case of using laser welding, similarly to seam welding, the laminated first metal plate and second metal plate are welded by laser welding along the peripheral edge of the first groove portion. Thereby, joining time can be shortened compared with the past. Further, in the case of laser welding, it is not necessary to arrange electrodes on the top and bottom of the metal plate as in the case of seam welding, and for example, welding can be performed by irradiating laser from above or below.

  In the above embodiment, the case where the laminated metal plate is used as the bottom plate of the outdoor unit has been described as an example. However, for example, the laminated metal plate can be used as a side plate or a top plate of the outdoor unit. It can also be used as a top board. Furthermore, you may use the laminated metal plate of this invention for uses other than an air conditioning apparatus which requires a fluid channel | path.

11 Refrigerant flow path 13 Bottom plate (laminated metal plate)
15 Lower metal plate 17 Upper metal plate 19 1st groove part 21 1st recessed part 23 2nd groove part 25 2nd recessed part 27 Connection part

Claims (10)

A laminated metal plate having a fluid passage (11) therein,
A first groove (19) that is recessed on one side in the thickness direction, and a recess (21) that is provided along the periphery of the first groove (19) and that is recessed on one side or the other side in the thickness direction. A metal plate (15);
The first metal plate (15) is laminated on the other side in the thickness direction, and is recessed on the other side in the thickness direction at a position facing the first groove portion (19) of the first metal plate (15). A second metal plate (17) having a second groove portion (23) that constitutes the fluid passage (11) together with one groove portion (19),
The first metal plate (15) is welded to the second metal plate (17) along the periphery of the first groove (19) between the recess (21) and the first groove (19). Being a laminated metal plate. The recess is a first recess (21);
The said 2nd metal plate (17) is provided along the periphery of the said 2nd groove part (23), and has a 2nd recessed part (25) dented in the other side of the said thickness direction. Laminated metal plate.   The said 1st recessed part (21) is provided in the position facing the said 2nd recessed part (25), is dented in the other side of the said thickness direction, and is arrange | positioned in the said 2nd recessed part (25). The laminated metal plate described in 1.   The first recess (21) is formed in a groove shape so as to continuously surround the periphery of the first groove (19), and the second recess (25) is formed on the second groove (23). The laminated metal plate according to claim 2, wherein the laminated metal plate is formed in a groove shape so as to continuously surround the periphery.   The plurality of first recesses (21) are provided so as to be scattered along the periphery of the first groove portion (19), and the second recess (25) is the periphery of the second groove portion (23). The laminated metal plate according to claim 3, wherein a plurality of the laminated metal plates are provided so as to be scattered along the line.   The said 1st metal plate (15) is welded with the 2nd metal plate (17) in the position near the said 1st groove part (19) between the said recessed part and the said 1st groove part (19). The laminated metal plate according to any one of 1 to 5.   The first metal plate (15) is welded to the second metal plate (17) at a position near the recess (21) between the recess (21) and the first groove (19). Item 6. The laminated metal plate according to any one of Items 1 to 5.   An air conditioner comprising the laminated metal plate (13) according to any one of claims 1 to 7, wherein the fluid passage (11) serves as a refrigerant passage. A method for producing a laminated metal plate having a fluid passage (11) therein,
A first groove portion (19) that is recessed on one side in the thickness direction and a recess portion (21) that is provided along the periphery of the first groove portion (19) and that is recessed on one side or the other side in the thickness direction are formed by pressing. The second metal plate (17), and the second metal plate (17) in which the second groove (23) recessed in the other side in the thickness direction is formed by pressing. Is laminated on the other side of the first metal plate (15) in the thickness direction so that the first groove portion (19) and the second groove portion (23) face each other;
The laminated first metal plate (15) and second metal plate (17) are placed between the recess (21) and the first groove (19) of the first metal plate (15). And a step of welding by laser welding or seam welding along the peripheral edge of the first groove portion (19). The recess is a first recess (21);
The second metal plate (17) is provided by pressing so as to be provided along the periphery of the second groove (23) and to be recessed on the same side as the first recess (21) in the thickness direction. A second recess (25)
In the laminating step, one of the first recess (21) and the second recess (25) is disposed in the other recess, and the first metal plate (15) and the second metal plate (17) are arranged. The method for manufacturing a laminated metal plate according to claim 9, wherein the alignment is performed.

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