JP2014030830A - Water heat exchanger and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a bonding time and prevent the occurrence of erosion in a refrigerant pipe, in a water heat exchanger configured by bonding a refrigerant pipe including a flat pipe made of aluminum or an aluminum alloy and a water pipe including a flat pipe made of a stainless steel and facing the refrigerant pipe by brazing or soldering, and a method for manufacturing the water heat exchanger.SOLUTION: In a method for manufacturing a water heat exchanger (22), a heat exchange assembly (22a) in a state where a refrigerant pipe (60) and a water pipe (40) face each other is immersed in a dip bath (100) in which a brazing material or a solder material is melted, and ultrasonic brazing or soldering is used which bonds the refrigerant pipe (60) and the water pipe (40) to each other by ultrasonic excitation of the heat exchange assembly (22a) through a vibration member (102). At this time, the heat exchange assembly (22a) is immersed in the dip bath (100) so that only the water pipe (40) is brought into contact with the vibration member (102).

Description

  The present invention relates to a water heat exchanger and a method for manufacturing the same, and in particular, a refrigerant tube made of a flat tube made of aluminum or aluminum alloy and a water tube made of a flat tube made of stainless steel facing the refrigerant tube are brazed or soldered. The present invention relates to a water heat exchanger configured by joining by attaching and a manufacturing method thereof.

  Conventionally, as a water heat exchanger for exchanging heat between refrigerant and water, as shown in Patent Document 1 (Japanese Patent Laid-Open No. 2010-190564), a refrigerant pipe and a water pipe made of an aluminum flat pipe are brazed or soldered. There is what was constituted by joining by attaching.

  In the conventional water heat exchanger, it is conceivable to change the material of the water pipe from aluminum to stainless steel in order to improve the corrosion resistance of the water pipe.

  However, when the water pipe is changed to stainless steel, it is necessary to join the aluminum refrigerant pipe and the stainless steel water pipe by brazing or soldering. Here, since the brazing material or the solder material has low wettability to stainless steel, there is a possibility that the joining time becomes long or sufficient joining strength cannot be obtained. In addition, when the joining time is long, in the aluminum refrigerant pipe, the brazing material or the solder material may diffuse into the refrigerant pipe as the base material and the base material may be melted (erosion).

  For this reason, as the water heat exchanger, a configuration in which a refrigerant tube made of a flat tube made of aluminum or an aluminum alloy and a water tube made of a stainless steel flat tube facing the refrigerant tube are joined by brazing or soldering is adopted. In this case, it is necessary to shorten the joining time and suppress the occurrence of erosion of the refrigerant pipe.

  An object of the present invention is configured by joining a refrigerant tube made of a flat tube made of aluminum or an aluminum alloy and a water tube made of a flat tube made of stainless steel facing the refrigerant tube by brazing or soldering. In the water heat exchanger and the manufacturing method therefor, it is intended to shorten the joining time and suppress the occurrence of erosion of the refrigerant pipe.

  According to a first aspect of the present invention, there is provided a method of manufacturing a water heat exchanger, wherein a refrigerant tube made of a flat tube made of aluminum or an aluminum alloy and a water tube made of a flat tube made of stainless steel facing the refrigerant tube are brazed or soldered. It is a manufacturing method of the water heat exchanger comprised by joining by attaching. In this manufacturing method, as brazing or soldering, the heat exchange assembly in which the refrigerant pipe and the water pipe are opposed to each other is immersed in a dip bath in which the brazing material or the solder material is melted, and the heat exchange is performed via the vibration member. Ultrasonic brazing or soldering is used to join the refrigerant pipe and the water pipe by ultrasonically exciting the combined body. Then, when performing ultrasonic brazing or soldering, the heat exchanger assembly is immersed in a dip bath so that only the water tube is in contact with the vibrating member.

  According to this manufacturing method, brazing or soldering can be performed while ultrasonically preferentially vibrating a water pipe that is less susceptible to erosion than a refrigerant pipe. For this reason, joining of a water pipe and a refrigerant pipe can be promoted, suppressing generation | occurrence | production of the erosion of the refrigerant pipe by ultrasonic vibration as much as possible. Thereby, shortening of the joining time of a refrigerant pipe and a water pipe can be aimed at, and generation | occurrence | production of the erosion of a refrigerant pipe can be suppressed.

  A method for manufacturing a water heat exchanger according to a second aspect is the method for manufacturing a water heat exchanger according to the first aspect, wherein the water pipe is provided with a water pipe side outer shape protruding part that protrudes outside the outer shape of the refrigerant pipe, By bringing the water tube outer shape protruding portion into contact with the vibrating member, only the water tube is in contact with the vibrating member.

  According to this manufacturing method, it is possible to easily realize a state in which only the water pipe is in contact with the vibration member by providing the water pipe side outer shape protruding portion in the water pipe.

  The manufacturing method of the water heat exchanger according to the third aspect is such that the clearance between the refrigerant pipe and the vibrating member is 2 mm or more in the manufacturing method of the water heat exchanger according to the first or second aspect.

  According to this manufacturing method, the gap between the refrigerant pipe and the vibration member is set at 2 mm or more, so that the action of accelerating the joining of the water pipe and the refrigerant pipe while suppressing the occurrence of erosion of the refrigerant pipe due to ultrasonic vibration. Can be obtained.

  A method for manufacturing a water heat exchanger according to a fourth aspect is the method for manufacturing a water heat exchanger according to any one of the first to third aspects, wherein the surface of the water pipe facing the refrigerant pipe is roughened. The heat exchanger assembly is formed by making the surface of the water pipe subjected to the roughening treatment and the refrigerant pipe face each other.

  According to this manufacturing method, the wettability of the brazing material or the solder material on the surface of the water pipe facing the refrigerant pipe is improved by the roughening process of the water pipe, so that the joining time can be further shortened. Further, by shortening the joining time by improving the wettability, the occurrence of erosion of the refrigerant pipe can be further suppressed.

  The manufacturing method of the water heat exchanger concerning a 5th viewpoint is a manufacturing method of the water heat exchanger concerning a 4th viewpoint. WHEREIN: A heat exchanger aggregate is formed in the surface facing a refrigerant pipe of a water pipe by a roughening process. A large number of irregularities extending along the direction of immersion in the dip bath are formed.

  According to this manufacturing method, since a large number of irregularities are regularly formed on the surface of the water pipe facing the refrigerant pipe by the roughening treatment of the water pipe, the brazing material or solder material for the surface of the water pipe facing the refrigerant pipe The wettability can be improved evenly.

  A method for manufacturing a water heat exchanger according to a sixth aspect is the method for manufacturing a water heat exchanger according to any one of the first to fourth aspects, wherein the surface of the water pipe facing the refrigerant pipe is brazed more than stainless steel. A heat treatment assembly is formed by applying a plating process for forming a metal layer with high wettability of the material or solder material, and making the surface of the water pipe subjected to the plating process and the refrigerant pipe face each other.

  According to this manufacturing method, because the wettability of the brazing material or the solder material on the surface of the water pipe facing the refrigerant pipe is improved by the plating treatment of the water pipe, the joining time can be further shortened, By shortening the joining time by improving the wettability, the occurrence of erosion of the refrigerant pipe can be further suppressed.

  The water heat exchanger according to the seventh aspect is manufactured by the manufacturing method according to any one of the first to sixth aspects.

  As described above, according to the present invention, the following effects can be obtained.

  In the water heat exchanger and the manufacturing method thereof according to the first and seventh aspects, brazing or soldering can be performed while ultrasonically preferentially vibrating a water pipe that is less likely to cause erosion than a refrigerant pipe. Therefore, it is possible to promote the joining of the water pipe and the refrigerant pipe while suppressing the occurrence of erosion of the refrigerant pipe due to the ultrasonic vibration as much as possible, thereby shortening the joining time of the refrigerant pipe and the water pipe. And erosion of the refrigerant pipe can be suppressed.

  In the method for manufacturing a water heat exchanger according to the second aspect, it is possible to easily realize a state in which only the water pipe is in contact with the vibrating member.

  In the method for manufacturing a water heat exchanger according to the third aspect, it is possible to reliably obtain the action of promoting the joining of the water pipe and the refrigerant pipe while suppressing the occurrence of erosion of the refrigerant pipe due to the ultrasonic vibration.

  In the method for manufacturing a water heat exchanger according to the fourth aspect, since the wettability of the brazing material or the solder material on the surface of the water pipe facing the refrigerant pipe is improved, the joining time can be further shortened, Further, by shortening the joining time by improving the wettability, the occurrence of erosion of the refrigerant pipe can be further suppressed.

  In the method for manufacturing a water heat exchanger according to the fifth aspect, since many irregularities are regularly formed on the surface of the water pipe facing the refrigerant pipe, the brazing material or solder material for the surface of the water pipe facing the refrigerant pipe The wettability can be improved evenly.

  In the method for manufacturing a water heat exchanger according to the sixth aspect, since the wettability of the brazing material or the solder material on the surface of the water pipe facing the refrigerant pipe is improved, the joining time can be further shortened, Further, by shortening the joining time by improving the wettability, the occurrence of erosion of the refrigerant pipe can be further suppressed.

It is a schematic block diagram of the heat pump type hot water supply apparatus with which the water heat exchanger concerning this invention was employ | adopted. It is a schematic sectional drawing which shows the inside of a warm water heat source unit. It is a whole block diagram of a water heat exchanger. It is a fragmentary perspective view which shows the external appearance of a water heat exchanger. It is II sectional drawing of FIG. It is a top view which shows the SUS plate which comprises the water pipe | tube of the water heat exchanger of 1st Embodiment. It is II-II sectional drawing of FIG. It is a top view which shows the state which piled up the SUS plate. It is a top view which shows typically the plane structure of the water heat exchanger of 1st Embodiment. (A) It is sectional drawing which shows the water pipe and entrance / exit port which passed through the 1st joining process, (b) The partial perspective view which shows a combination process, (c) The conceptual diagram which shows a 2nd joining process. It is sectional drawing which shows the structure of the periphery of the right side inlet-and-outlet part of the water heat exchanger of 1st Embodiment. It is a figure which shows the contact state of the water heat exchanger and vibration member in a 3rd joining process. It is a figure which shows the water heat exchanger of 2nd Embodiment, Comprising: It is sectional drawing which expands and shows the joining surface vicinity of a water pipe and a refrigerant pipe. It is a top view which shows the SUS plate which comprises the water pipe | tube of the water heat exchanger of 2nd Embodiment. It is a figure which shows the water heat exchanger of 3rd Embodiment, Comprising: It is sectional drawing which expands and shows the joining surface vicinity of a water pipe and a refrigerant pipe. It is a top view which shows the SUS plate which comprises the water pipe | tube of the water heat exchanger of 3rd Embodiment. It is a figure which shows the water heat exchanger of 4th Embodiment, Comprising: It is a figure equivalent to II sectional drawing of FIG.

  Hereinafter, an embodiment of a water heat exchanger and a manufacturing method thereof according to the present invention will be described with reference to the drawings. In addition, embodiment of the water heat exchanger concerning this invention and its manufacturing method is not restricted to the following embodiment, It can change in the range which does not deviate from the summary of invention. Moreover, although the water heat exchanger concerning this invention uses natural refrigerant | coolants, such as Freon-type refrigerant | coolants, such as R410A, and a carbon dioxide, as a refrigerant | coolant, below, the water heat exchanger using the carbon dioxide as a refrigerant | coolant is used. An example will be described.

<Configuration of heat pump hot water supply device>
-Overall configuration-
FIG. 1 is a schematic configuration diagram of a heat pump hot water supply apparatus 1 in which a water heat exchanger 22 according to the present invention is employed.

  The heat pump hot water supply apparatus 1 mainly includes a hot water heat source unit 2 and a hot water storage unit 3.

  The hot water heat source unit 2 mainly includes a compressor 21, a water heat exchanger 22, an expansion valve 23, and an air heat exchanger 24. The refrigerant circuit 20 is connected by connecting these devices. It is composed.

  The hot water storage unit 3 mainly includes a hot water storage tank 31 and a water circulation pump 32. The water circulation circuit 30 is configured by connecting the water heat exchanger 22, the hot water storage tank 31, and the water circulation pump 32.

-Hot water heat source unit-
FIG. 2 is a schematic cross-sectional view showing the inside of the hot water heat source unit 2.

  In FIG. 2, the right compartment of the heat insulation wall 2c is the machine room 2a, and the left compartment of the heat insulation wall 2c is the fan room 2b. A compressor 21, an expansion valve 23, and the like are disposed in the machine room 2a. A fan 27 is disposed in the fan chamber 2b. A motor (not shown) that drives the fan 27 is disposed behind the fan 27 in a state of being fixed to the motor support base 28. A water heat exchanger 22 is disposed below the fan chamber 2b with a heat insulating wall 2d interposed therebetween. In the water heat exchanger 22, heat exchange is performed between the refrigerant compressed to a pressure exceeding the critical pressure by the compressor 21 and discharged and the water discharged from the water circulation pump 32. In FIG. 2, the air heat exchanger 24 is disposed along the left side wall and the back wall of the fan chamber 2b, and the right end of the air heat exchanger 24 extends to the center of the machine chamber 2a. A control box 4 is disposed in the upper part of the machine room 2a.

  In addition, although the heat pump type hot water supply device 1 is illustrated here as an apparatus structure provided with the water heat exchanger 22 which performs heat exchange with a refrigerant | coolant and water, it is not limited to this, a refrigerant | coolant and water As long as it is a water-cooled refrigeration apparatus or the like provided with a water heat exchanger that performs heat exchange with the other apparatus, another apparatus configuration may be used. Moreover, as water which performs heat exchange with a refrigerant | coolant, you may use not only water itself but the aqueous medium which contains water, such as brine and seawater, as a main component.

<Water heat exchanger and its manufacturing method>
-Overall configuration-
FIG. 3 is an overall configuration diagram of the water heat exchanger 22. FIG. 4 is a partial perspective view showing the appearance of the water heat exchanger 22. 5 is a cross-sectional view taken along the line II of FIG.

  The water heat exchanger 22 is a heat exchanger that exchanges heat between the refrigerant (here, the high-pressure refrigerant discharged from the compressor 21) and water (here, the low-pressure water discharged from the water circulation pump 32). . The water heat exchanger 22 mainly includes a water pipe 40 composed of a plurality (here, five) flat tubes, a refrigerant pipe 60 composed of a plurality (here, four) flat tubes, and an inlet / outlet portion for the water tubes 40. 50 and an inlet / outlet pipe 70 for the refrigerant pipe 60. Here, as shown in FIGS. 4 and 5, a configuration in which the water pipes 40 and the refrigerant pipes 60 are alternately stacked is adopted, but the number of the water pipes 40 and the refrigerant pipes 60 to be stacked is as follows. In this case, the water pipe 40 is disposed at the lowermost stage and the uppermost stage, but the refrigerant pipe 60 may be disposed at the lowermost stage or the uppermost stage. Good.

  The water pipe 40 is made of stainless steel because corrosion resistance against water is required. Here, as stainless steel used for the water pipe 40, SUS304, SUS304L, SUS316, SUS316L, etc. are used, for example.

  Since the refrigerant tube 60 is required to have pressure resistance against a high-pressure refrigerant, a flat multi-hole tube in which a large number of thin flow paths 61 are formed is used. Here, since the flat multi-hole tube is manufactured by an extrusion process, the refrigerant pipe 60 is made of aluminum or aluminum alloy having excellent workability.

  The refrigerant pipe 60 made of a flat tube made of aluminum or an aluminum alloy and the water pipe 40 made of a stainless steel flat tube facing the refrigerant pipe 60 are joined by brazing or soldering as described later. Yes.

  Further, as shown in FIG. 3, the water heat exchanger 22 includes, as the inlet / outlet portion 50 in a state where the water pipe 40 and the refrigerant pipe 60 are horizontally arranged, a right inlet / outlet portion 51 disposed at the right end portion of the water tube 40. And a left-side entrance / exit portion 52 disposed at the left end. An inlet / outlet port 54 connected to a water pipe or the like constituting the water circulation circuit 30 is provided at an end of the left inlet / outlet part 52 or an end of the right inlet / outlet part 51 shown in FIG. Here, in order to make the explanation easy to understand, the case where the water heat exchanger 22 is placed in the state of FIG. 3 is described, but the water heat exchanger 22 is not necessarily used in the state of FIG. It is not something that will not be. For example, the water heat exchanger 22 can be used with the right inlet / outlet portion 51 arranged at the top and the left inlet / outlet portion 52 arranged at the bottom.

  On the water pipe 40 side, the water first enters the left inlet / outlet part 52, is divided into five water pipes 40, flows through the water from left to right, and exits from the right inlet / outlet part 51. The water is heated by heat given from the refrigerant flowing through the refrigerant pipe 60 while flowing through the water pipe 40.

  Further, the water heat exchanger 22 has a right side inlet / outlet pipe 71 arranged at the right end of the refrigerant pipe 60 and a left side inlet / outlet pipe 72 arranged at the left end as the inlet / outlet pipe 70. . The refrigerant enters the left inlet / outlet distribution pipe 72, is divided into four refrigerant pipes 60, flows through the refrigerant from left to right, and exits from the right inlet / outlet distribution pipe 71. The refrigerant is cooled by taking heat away from the water flowing through the water pipe 40 while flowing through the refrigerant pipe 60.

-Water heat exchanger of the first embodiment-
Next, the detailed structure and manufacturing method of the water heat exchanger 22 according to the first embodiment will be described.

(1) Structure of water pipe FIG. 6 is a plan view showing a SUS plate 80 constituting the water pipe 40 of the water heat exchanger 22 of the present embodiment. 7 is a cross-sectional view taken along the line II-II in FIG. FIG. 8 is a plan view showing a state in which the SUS plates 80 are overlapped.

  The water pipe 40 and the inlet / outlet portions 51 and 52 are constituted by a stainless steel SUS plate 80. As shown in FIG. 6, the SUS plate 80 has a substantially rectangular plane shape that is long on the left and right, and two bulging portions 81 and 82 are formed on both the left and right ends. The bulge formed at the right end of the SUS plate 80 is a right bulge 81, and the bulge formed at the left end is a left bulge 82. A circular right opening 91 is formed in the right bulging portion 81, and a circular left opening 92 is formed in the left bulging portion 82. Further, the right opening 91 and the left opening 92 protrude toward one side of the SUS plate 80 in the width direction (upward in the drawing in FIG. 6). However, the shape of the openings 91 and 92 may be the same shape so as to make it difficult to leak water, and is not limited to a circle. Further, the position and size of the arrangement are set according to the flow rate of water and the like.

  As shown in FIG. 7, the SUS plate 80 has a concave portion 94 formed by press working. The concave surface portion 94 occupies a region inside the peripheral edge portion 84 having a predetermined width formed along the outer periphery 83 of the SUS plate 80. The right opening 91 and the left opening 92 are formed in the concave portion 94. The right-side opening 91 and the left-side opening 92 are disposed in the recessed portion 95 that is further deepened in the recessed surface portion 94. Although not adopted here, dimples and chevrons for promoting heat transfer may be formed when the concave surface portion 94 is formed by pressing.

  Then, as shown in FIGS. 5 and 8, the pair of SUS plates 80 are overlapped so that the peripheral edge portion 84 overlaps. When the SUS plate 80 is overlaid, the flow path 21 through which water flows is formed by the two concave portions 94. The flow path 21 continues to the right opening 91 and the left opening 92. By overlapping the SUS plates 80, the right side openings 91 and the right side openings 92 are arranged to face each other. Thereby, the entrance / exit part 50 is formed straightly. The peripheral part 84 which overlaps in the SUS plate 80 is joined by brazing or welding, and the water pipe 40 which consists of a flat pipe is formed. Here, the surface of the water tube 40 that faces the refrigerant tube 60, that is, the surface of the concave surface portion 94 of the SUS plate 80 that is opposite to the flow path 21 is referred to as a joint surface 42. Further, a surface facing the joint surface 42, that is, a surface facing the water pipe 40 of the refrigerant tube 60 is defined as a joint surface 62.

(2) Laminated structure of water pipe and refrigerant pipe FIG. 9 is a plan view schematically showing a planar configuration of the water heat exchanger 22 of the present embodiment. In FIG. 9, the illustration of the uppermost water pipe 40 shown in FIG. 4 is omitted so that the joint surface 62 of the refrigerant pipe 60 can be seen.

  The water pipe 40 and the refrigerant pipe 60 have straight shapes in plan view. A right side entrance 51 and a left side entrance 52 are formed beside the refrigerant pipe 60. On the other hand, the right inlet / outlet pipe 71 and the left inlet / outlet pipe 72 are provided at both ends of the refrigerant pipe 60.

  Further, as shown in FIGS. 5 and 9, the water tube 40 is provided with a water tube side outer shape protruding portion 44 that protrudes outward from the outer shape of the refrigerant tube 60. Here, the water pipe-side outer shape protruding portion 44 is located outside the end in the width direction of the refrigerant pipe 60 (that is, the left end in FIG. 5 and the lower end in FIG. 9) in plan view of the water pipe 40 and the refrigerant pipe 60. It is a part of the protruding water pipe 40. Here, as shown in FIGS. 5 and 9, the water tube side outer shape protruding portion 44 protrudes outward by a distance L with respect to the end portion in the width direction of the refrigerant tube 60. And the water pipe side external shape protrusion part 44 is comprised by the peripheral part 84 of the SUS plate 80, and its vicinity part, as shown in FIG. Moreover, the water pipe side external shape protrusion part 44 is provided over the whole longitudinal direction of the water pipe 40, as shown in FIG. As shown in FIG. 9, the inlet / outlet portions 51, 52 of the water pipe 40 and the upper end portion (right end portion in FIG. 5) between the inlet / outlet portions 51, 52 are also outside the end portion in the width direction of the refrigerant pipe 60. Since it protrudes, it can be said that these parts are also the water pipe side external shape protrusion part 44 in the meaning. However, here, for convenience of description of the method for manufacturing the water heat exchanger 22 described later, only the portion of the water pipe 40 that is brought into contact with the vibration member 102 (described later) means the water pipe side outer shape protruding portion 44.

(3) Manufacturing method of water heat exchanger FIG. 10: (a) Sectional drawing which shows the water pipe 40 and the inlet / outlet port 54 which passed through the 1st joining process, (b) The partial perspective view which shows a combination process, (c) 3rd It is a conceptual diagram which shows a joining process. FIG. 11 is a cross-sectional view showing the structure around the right entrance 51 of the water heat exchanger 22 of the present embodiment. FIG. 12 is a diagram illustrating a contact state between the water heat exchanger 22 and the vibration member 102 in the third joining step.

  First, the stainless steel plate is pressed to form the SUS plate 80 shown in FIG. That is, a stainless steel plate is punched out along the outer periphery 83 by press work, and the right opening 91 and the left opening 92 are formed.

  Next, as shown in FIG. 10A, the peripheral portions 84, the right side openings 91 and the left side openings 92 are joined together by brazing or welding while sequentially superposing the SUS plates 80. Here, the joint portion between the peripheral edge portions 84 is the joint portion A, and the joint portion between the right side opening portions 91 and the left side opening portion 92 is the joint portion B. Thereby, the water pipe 40 which consists of a flat tube is formed, and the opening parts 91 and 92 which connect between the water pipes 40 are connected. Further, the inlet / outlet port 54 is joined to the uppermost water pipe 40 by brazing or welding. Here, the joint portion between the uppermost water pipe 40 and the inlet / outlet port 54 is a joint portion C. The water pipe joined body 43 is formed by such a first joining step.

  In parallel with the first joining step of forming the water pipe joined body 43, the refrigerant pipe 60 formed of a flat multi-hole pipe formed by extrusion, the right inlet / outlet pipe 71 and the left inlet / outlet pipe 72 are Join by welding or welding. Thereby, the refrigerant pipe 60 communicates with the inlet / outlet pipes 71 and 72. The refrigerant pipe assembly 63 is formed by such a second joining step.

  Next, as shown in FIG. 10 (b), by combining the refrigerant tube assembly 63 and the water tube assembly 43 so that the joint surface 62 of the refrigerant tube 60 and the joint surface 42 of the water tube 40 face each other, A heat exchanger assembly 22a is formed. Thereby, the joining surface 62 of the refrigerant pipe 60 and the joining surface 42 of the water pipe 40 are in a state of facing each other. Here, as shown in FIGS. 5 and 9, a state is obtained in which the water tube side outer shape protruding portion 44 of the water tube 40 protrudes outward from the end portion in the width direction of the refrigerant tube 60.

  Next, as shown in FIG. 10 (c), the heat exchanger assembly 22a in a state where the refrigerant pipe 60 and the water pipe 40 are opposed to each other is immersed in a dip bath 100 in which a brazing material or a solder material is melted, and a vibrating member. By ultrasonically exciting the heat exchanger assembly 22 a via 102, the joint surface 62 of the refrigerant tube 60 and the joint surface 42 of the water tube 40 are soldered. That is, the joining surface 62 of the refrigerant pipe 60 and the joining surface 42 of the water pipe 40 are joined by ultrasonic brazing or soldering. In this case, as shown in FIG. 12, when performing ultrasonic brazing or soldering, the heat exchanger assembly 22 a is placed in the dip bath 100 so that only the water tube 40 is in contact with the vibrating member 102. So that it is immersed in That is, only the water pipe 40 is in contact with the vibration member 102 by bringing the water pipe outer shape protruding portion 44 of the water pipe 40 into contact with the vibration member 102. Here, the distance L at which the water tube outer shape protruding portion 44 protrudes outward from the end portion in the width direction of the refrigerant tube 60 is 2 mm or more (preferably 5 mm or more). And the vibration member 102 are in a state of being 2 mm or more (preferably 5 mm or more), the same as the distance L.

  More specifically, an aluminum-zinc or aluminum-tin solder material is dissolved in the dip bath 100, and the heat exchanger assembly 22a is immersed in the dip bath 100. Here, the vibration member 102 that is ultrasonically excited by the ultrasonic vibrator 101 is immersed in the dip bath 100, so that soldering can be performed without using a flux. Here, as shown in FIG. 12, the heat exchanger assembly 22 a is immersed in the dip bath 100 so that only the water pipe 40 is in contact with the vibrating member 102.

  As described above, when the heat exchanger assembly 22a is immersed in the dip bath 100 and the heat exchanger assembly 22a is subjected to ultrasonic vibration through the vibrating member 102, the joint surface 62 of the refrigerant pipe 60 and the joint surface 42 of the water pipe 40 are formed. The solder material spreads between them, and the refrigerant pipe 60 and the water pipe 40 are soldered. Here, as shown in FIG. 11, the joint portion between the joint surface 62 of the refrigerant pipe 60 and the joint surface 42 of the water pipe 40 is a joint portion D.

  Here, by immersing the heat exchanger assembly 22a in the dip bath 100 so that only the water pipe 40 is in contact with the vibrating member 102, the water pipe 40, which is less likely to cause erosion than the refrigerant pipe 60, is preferentially exceeded. Solder material can be spread between the joint surface 62 of the refrigerant pipe 60 and the joint surface 42 of the water pipe 40 while sonic excitation. For this reason, joining of the water pipe 40 and the refrigerant pipe 60 is promoted by ultrasonic vibration, and aluminum or the base material is compared with the case where ultrasonic vibration is performed with the refrigerant pipe 60 in contact with the vibration member 102. It becomes possible to suppress the progress of the diffusion of zinc and tin contained in the solder material in the refrigerant pipe 60 made of aluminum alloy, and thereby the generation of erosion of the refrigerant pipe 60 can be suppressed as much as possible. In addition, here, by providing the water pipe 40 with the water pipe side outer shape protruding portion 44, it is possible to easily realize a state in which only the water pipe 40 is in contact with the vibration member 102. Furthermore, here, the gap (in this case, the distance L) between the refrigerant pipe 60 and the vibration member 102 is 2 mm or more, thereby suppressing the occurrence of erosion of the refrigerant pipe 60 due to ultrasonic vibration, and the water pipe 40 and the refrigerant pipe 60. Thus, it is possible to reliably obtain the effect of promoting the bonding with the.

  Here, dip soldering is adopted for joining the joining surface 62 of the refrigerant pipe 60 and the joining surface 42 of the water pipe 40, but the present invention is not limited to this. Ultrasonic brazing using any brazing material may be employed. Even in this case, the same effects as those of the above-described ultrasonic soldering can be obtained.

-Water heat exchanger of the second embodiment-
Next, the detailed structure and manufacturing method of the water heat exchanger 22 concerning 2nd Embodiment are demonstrated. FIG. 13 is a view showing the water heat exchanger 22 of the present embodiment, and is an enlarged sectional view showing the vicinity of the joint surfaces 42 and 62 between the water pipe 40 and the refrigerant pipe 60. FIG. 14 is a plan view showing a SUS plate 80 constituting the water pipe 40 of the water heat exchanger 22 of the present embodiment.

  The water heat exchanger 22 of the present embodiment is different in the structure of the water pipe 40 of the water heat exchanger 22 of the first embodiment. Specifically, in the SUS plate 80 that constitutes the water pipe 40 of the first embodiment, no special treatment is applied to the joint surface 42 that is a surface facing the refrigerant pipe 60 of the water pipe 40, but in this embodiment, As shown in FIG. 13 and FIG. 14, the heat exchanger assembly 22 a is formed by applying a roughening process and causing the joint surface 42 subjected to the roughening process of the water pipe 40 and the joint surface 62 of the refrigerant pipe 60 to face each other. Try to form.

  Specifically, the joint surface 42 that is the surface of the water tube 40 that faces the refrigerant tube 60, that is, the surface opposite to the flow path 21 of the concave surface portion 94 of the SUS plate 80, is shown in FIGS. 13 and 14. As shown in FIG. Here, a roughening process is performed on the joint surface 42 so that a large number of irregularities 42a extending substantially linearly in the width direction of the water tube 40 (that is, the SUS plate 80) is formed in the vertical direction in FIG. It has been subjected. Such roughening treatment on the joint surface 42 of the water pipe 40 is performed in order to improve the wettability of the brazing material or the solder material with respect to the joint surface 42 of the water pipe 40. In addition, the many unevenness | corrugations 42a formed in the joint surface 42 of the water pipe 40 by a roughening process are not restricted to what extends in a substantially linear shape toward fixed directions like the width direction of the water pipe 40. However, from the viewpoint of improving the wettability of the brazing material or the solder material to the joint surface 42 of the water pipe 40 without unevenness, the water pipe 40 is formed so that a large number of irregularities 42a are regularly formed on the joint surface 42 of the water pipe 40. In addition to the width direction, it is preferable to form the unevenness 42a that extends substantially linearly in a certain direction, such as the longitudinal direction or the oblique direction of the water tube 40. Further, as described above, when joining the water pipe 40 and the refrigerant pipe 60 by ultrasonic brazing or soldering, it is easy to spread the brazing material or the solder material between the refrigerant pipe 60 and the water pipe 40. From this viewpoint, it is preferable to form a large number of irregularities 42a extending along the direction in which the refrigerant pipe 60 and the water pipe 40 are immersed in the dip bath (here, the width direction of the water pipe 40). Further, as shown in FIG. 13, the joint surface 42 is in a state in which the surface roughness is larger than the joint surface 62 which is a surface facing the water pipe 40 of the refrigerant pipe 60 by the roughening process. That is, the roughening process is not performed on the refrigerant pipe 60 manufactured by the extrusion process, and the surface roughness is small. Thus, the degree of wettability of the brazing material or the solder material can be equalized between the joint surface 62 of the refrigerant pipe 60 and the joint surface 42 of the water pipe 40. The roughening treatment may be performed after the SUS plate 80 is formed by press working, or may be performed on the stainless steel plate before the press working.

  The detailed structure of the water heat exchanger 22 according to the present embodiment is the same as the detailed structure of the water heat exchanger 22 according to the first embodiment except that the water pipe 40 is subjected to a roughing process. Then, explanation is omitted.

  And, since the wettability of the brazing material or the solder material at the joint surface 42 of the water pipe 40 is improved by the roughening treatment to the water pipe 40, at the time of ultrasonic brazing or soldering, The joining can be completed in a shorter time compared to the case where the water pipe 40 is not roughened. Further, by shortening the joining time by improving the wettability, it is possible to further suppress the progress of diffusion of zinc and tin contained in the solder material in the refrigerant pipe 60 made of aluminum or aluminum alloy as a base material. Thus, the occurrence of erosion of the refrigerant pipe 60 can be further suppressed. Moreover, a large number of irregularities 42a formed on the joint surface 42 of the water pipe 40 by the roughening process regularly extend substantially linearly in a certain direction (here, the width direction of the water pipe 40). Therefore, the wettability of the solder material with respect to the joint surface 42 of the water pipe 40 can be improved without unevenness. In addition, a gap between the refrigerant pipe 60 and the water pipe 40 extending along the direction of immersion in the dip bath 100 formed by a large number of irregularities 42a generates a capillary phenomenon, and the refrigerant pipe 60 and the water pipe are used as a dip bath. When dipping, the solder material can be easily spread between the refrigerant pipe 60 and the water pipe 40. Moreover, since the surface roughness of the joint surface 42 of the water pipe 40 is larger than that of the joint surface 62 of the refrigerant pipe 60 by the roughening process, the solder between the joint surface 42 and the joint surface 62 is soldered. Since the degree of wettability of the material can be equalized, it is possible to reliably reduce the joining time.

-Water heat exchanger of the third embodiment-
Next, the detailed structure and manufacturing method of the water heat exchanger 22 according to the third embodiment will be described. FIG. 15 is a view showing the water heat exchanger 22 of the present embodiment, and is an enlarged sectional view showing the vicinity of the joint surfaces 42 and 62 between the water pipe 40 and the refrigerant pipe 60. FIG. 16 is a plan view showing a SUS plate 80 constituting the water pipe 40 of the water heat exchanger 22 of the present embodiment.

  The water heat exchanger 22 of this embodiment differs in the structure of the water pipe 40 of the water heat exchanger 22 of 2nd Embodiment. Specifically, in the SUS plate 80 constituting the water pipe 40 of the second embodiment, a roughening process is performed on the joint surface 42 with the refrigerant pipe 60. In the present embodiment, FIG. 15 and FIG. As shown in the drawing, instead of the roughening process, a plating process for forming a metal layer 42b having a higher wettability of brazing material or solder material than stainless steel on the joining surface 42 is performed. In addition, the detailed structure and manufacturing method of the water heat exchanger 22 of this embodiment are the details of the water heat exchanger 22 of 2nd Embodiment except for performing the plating process instead of the roughening process of the water pipe 40. Since the structure and the manufacturing method are the same, the description is omitted here.

  Then, the plating treatment of the water pipe 40 as described above improves the wettability of the brazing material or the solder material with respect to the joining surface 42 facing the refrigerant pipe 60 of the water pipe 40 in the same manner as in the second embodiment. Further shortening can be achieved, and the occurrence of erosion of the refrigerant pipe 40 can be further suppressed.

  Here, as the metal layer 42b formed by plating, a copper or nickel layer in which the wettability of the brazing material or the solder material is excellent can be considered. Examples of the plating treatment of the metal layer 42b include a cyanide salt plating method and a sulfate plating method. And the plating process of the water pipe 40 may be performed after forming the SUS plate 80 by press work, and may be performed to the stainless steel plate before performing press work.

-Water heat exchanger of the fourth embodiment-
The specific configuration of the water heat exchanger 22 is not limited to the above-described one, and a refrigerant pipe made of a flat tube made of aluminum or aluminum alloy and a water pipe made of a flat tube made of stainless steel are provided. As long as the water heat exchanger is configured by being joined by brazing or soldering, another device configuration may be used.

  In the configurations of the first to third embodiments, a configuration in which a plurality of refrigerant tubes 60 and water tubes 40 are stacked is adopted, but the configuration is not limited to this. For example, as shown in FIG. The water heat exchanger 22 may be configured by joining one refrigerant pipe 60 and one water pipe 40 by brazing or soldering.

  Moreover, in the manufacturing method of the water heat exchanger of 1st-3rd embodiment, when performing ultrasonic brazing or soldering by providing the water pipe external shape protrusion part 44 in the water pipe 40, only the water pipe 40 is provided. Although it is made to be in the state which contacted the vibration member 102, it is not limited to this. For example, although not shown here, by projecting the portion of the vibrating member 102 that contacts the water tube 40 toward the water tube 40, only the water tube 40 vibrates with a gap between the refrigerant tube 60 and the vibrating member 102. You may make it be in the state which contacted the member 102. FIG.

  The present invention relates to water constituted by joining a refrigerant tube made of a flat tube made of aluminum or an aluminum alloy and a water tube made of a flat tube made of stainless steel facing the refrigerant tube by brazing or soldering. The present invention is widely applicable to heat exchangers and manufacturing methods thereof.

22 Water heat exchanger 22a Heat exchanger assembly 40 Water pipe 42 Joint surface (surface facing the water pipe refrigerant pipe)
42a Concavity and convexity 42b Metal layer 44 Water tube side outer shape protrusion 60 Refrigerant tube 100 Dip bath 102 Vibration member

JP 2010-190564 A

Claims (7)

A refrigerant pipe (60) made of a flat tube made of aluminum or aluminum alloy and a water pipe (40) made of a flat tube made of stainless steel facing the refrigerant pipe are joined by brazing or soldering. In the manufacturing method of the water heat exchanger to be performed,
As the brazing or soldering, the heat exchanger assembly (22a) in a state where the refrigerant pipe and the water pipe face each other is immersed in a dip bath (100) in which a brazing material or a soldering material is melted, and a vibration member ( 102) using ultrasonic brazing or soldering to join the refrigerant pipe and the water pipe by ultrasonically exciting the heat exchanger assembly via
When the ultrasonic brazing or soldering is performed, the heat exchanger assembly is immersed in the dip bath so that only the water pipe is in contact with the vibrating member.
The manufacturing method of a water heat exchanger (22). The water pipe (40) is provided with a water pipe side outer protrusion (44) that protrudes outward from the outer shape of the refrigerant pipe (60),
By bringing the water pipe outer shape protruding portion into contact with the vibrating member (102), only the water pipe is brought into contact with the vibrating member.
The manufacturing method of the water heat exchanger (22) of Claim 1. Leaving a gap of 2 mm or more between the refrigerant pipe (60) and the vibrating member (102);
The manufacturing method of the water heat exchanger (22) of Claim 1 or 2. Roughening the surface (42) of the water pipe (40) facing the refrigerant pipe (60);
Forming the heat exchanger assembly (22a) by making the surface of the water pipe subjected to the roughening treatment and the refrigerant pipe face each other;
The manufacturing method of the water heat exchanger (22) of any one of Claims 1-3. By the roughening treatment, the surface (42) of the water pipe (40) facing the refrigerant pipe (60) extends along the direction in which the heat exchanger assembly (22a) is immersed in the dip bath (100). Forming a number of irregularities (42a);
The manufacturing method of the water heat exchanger (22) of Claim 4. The surface (42) of the water pipe (40) facing the refrigerant pipe (60) is plated to form a metal layer (42b) having a higher wettability of brazing material or solder material than stainless steel,
Forming the heat exchanger assembly (22a) by making the surface of the water pipe subjected to the plating treatment and the refrigerant pipe face each other;
The manufacturing method of the water heat exchanger (22) of any one of Claims 1-3.   The water heat exchanger (22) manufactured by the manufacturing method of any one of Claims 1-6.

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