WO2011039934A1

WO2011039934A1 - Stacking type heat exchanger and method for producing a stacking type heat exchanger

Info

Publication number: WO2011039934A1
Application number: PCT/JP2010/005204
Authority: WO
Inventors: 智教菊野
Original assignee: ダイキン工業株式会社
Priority date: 2009-09-30
Filing date: 2010-08-24
Publication date: 2011-04-07
Also published as: JP5180174B2; JP2011075186A

Abstract

A stacking type heat exchanger (17) is provided with a metal pipe (13) for a cooling medium, a metal pipe (11) for a fluid, header sections (33b) for the cooling medium, and header sections (33a) for the fluid. A cooling medium can flow through the inside of the metal pipe (13) for a cooling medium. A fluid which can exchange heat with the aforementioned cooling medium can flow through the metal pipe (11) for a fluid. The metal pipe (11) for a fluid is stacked onto the metal pipe (13) for a cooling medium and is joined to the metal pipe (13) for a cooling medium via a solder layer (15) or a resin bonding layer which are positioned between the metal pipe (11) for a fluid and the metal pipe (13) for a cooling medium. The header sections (33b) for the cooling medium is joined to the ends of the metal pipe (13) of a cooling medium by means of brazing or fusion welding. The header sections (33a) for the fluid is joined to the ends of the metal pipe (11) for a fluid.

Description

Laminated heat exchanger and method for producing laminated heat exchanger

The present invention relates to a stacked heat exchanger and a method for manufacturing the stacked heat exchanger.

Conventionally, heat exchangers for heat exchange between water or air and a refrigerant in a heat pump water heater, an air conditioner, and the like are known. In this heat exchanger, various metal parts are joined together by brazing or the like.

However, in the manufacturing method using brazing, since it is necessary to join metal parts in a large heating furnace that can be adjusted to a high temperature atmosphere, there is a problem that costs for manufacturing equipment, running costs, and the like increase. .

Patent Document 1 discloses a method for manufacturing a twisted tube heat exchanger in which metal parts are bonded together using a thermosetting resin adhesive. This manufacturing method eliminates the need for manufacturing equipment such as brazing, thereby reducing costs.

JP 2006-284209 A

However, since joining with a resin adhesive is not necessarily sufficient in terms of rigidity, adhesive strength, etc., for example, it is necessary to maintain a liquid-tight state by joining parts where high pressure is applied in a heat exchanger, for example. It is not necessarily suitable for the application.

An object of the present invention is to provide a stacked heat exchanger that does not require a large heating furnace that can be adjusted to a high temperature atmosphere at the time of manufacture, and that can maintain a liquid-tight state even when joining high-pressure sites, and a stacked mold It is in providing the manufacturing method of a heat exchanger.

The laminated heat exchanger of the present invention includes a refrigerant metal tube (13), a fluid metal tube (11), a refrigerant header portion (33b), and a fluid header portion (33a). A refrigerant can flow through the metal pipe for refrigerant (13). The fluid metal pipe (11) is capable of circulating a fluid that exchanges heat with the refrigerant, and is stacked on the refrigerant metal pipe (13) to be connected to the refrigerant metal pipe (13). It is joined to the metal pipe for refrigerant (13) by a solder layer (15) or a resin adhesive layer interposed therebetween. The refrigerant header (33b) is joined to the end of the refrigerant metal pipe (13) by brazing or fusion welding. The fluid header (33a) is joined to the end of the fluid metal pipe (11).

(A) is a perspective view which shows the laminated heat exchanger concerning one Embodiment of this invention, (B) is the top view. It is a front view of the laminated heat exchanger of FIG. (A) is sectional drawing which shows the header part for refrigerant | coolants in the laminated heat exchanger of FIG. 1, (B) is sectional drawing which shows the header part for fluids. It is the schematic which shows the structure of the soldering apparatus used for the manufacturing method of the laminated heat exchanger concerning one Embodiment of this invention. (A) is sectional drawing which shows the shaping | molding process which shape | molds a temporary assembly in the said manufacturing method, (B) is sectional drawing which shows the temporary assembly obtained by the said formation process. It is the schematic which shows the auxiliary heating process and joining process in the said manufacturing method.

Hereinafter, a stacked heat exchanger according to an embodiment of the present invention and a manufacturing method thereof will be described in detail with reference to the drawings.

<Laminated heat exchanger>
As shown in FIGS. 1A, 1B, 2 and 3, the stacked heat exchanger 17 of the present embodiment is a heat exchange unit for exchanging heat between a fluid such as water and a refrigerant. 31 and

header portions

33, 33 provided at both ends of the heat exchanging portion 31. This laminated heat exchanger 17 can be used as a heat exchanger of a heat pump water heater, for example. In this case, the temperature of water is adjusted by heat exchange between the refrigerant circulating in the refrigerant circuit in the hot water heater (not shown) and the water.

The laminated heat exchanger 17 includes a fluid metal tube 11, a refrigerant metal tube 13 stacked on the fluid metal tube 11 at one position in the thickness direction of the fluid metal tube 11, and a fluid metal tube. 11 and a metal pipe for refrigerant 14 laminated on the metal pipe for fluid 11 at a position on the other side in the thickness direction.

As shown in FIG. 5 (A), the fluid metal tube 11 has a flat shape with a width larger than the thickness. A fluid channel 11 a extending in the longitudinal direction is formed inside the metal pipe 11 for fluid. The fluid metal tube 11 has a long shape as shown in FIGS. 1A, 1B, 2 and 3.

The

refrigerant metal tubes

13 and 14 each have a flat shape whose width is larger than thickness. Moreover, the

metal pipes

13 and 14 for refrigerant | coolants have an elongate shape, respectively. The refrigerant metal tube 13 is a multi-hole tube in which a plurality of refrigerant channels 13a extending in the longitudinal direction are formed. The plurality of refrigerant flow paths 13a are independent from each other and are arranged in a line in the width direction. Similarly, the refrigerant metal tube 14 is a multi-hole tube in which a plurality of refrigerant channels 14a extending in the longitudinal direction are formed. The plurality of refrigerant flow paths 14a are independent from each other and are arranged in a line in the width direction.

As shown in FIG. 5 (A), the fluid metal tube 11 has an outer surface 11b which is one surface in the thickness direction and an outer surface 11c which is the other surface. The refrigerant metal tube 13 has an outer surface 13 b that faces the outer surface 11 b on one side of the fluid metal tube 11. The outer surface 13b is joined to the outer surface 11b of the fluid metal tube 11 by a solder layer 15a. The refrigerant metal tube 14 has an outer surface 14 b that faces the outer surface 11 c on the other side of the fluid metal tube 11. The outer surface 14b is joined to the outer surface 11c of the fluid metal tube 11 by a solder layer 15b.

The

outer surfaces

13b and 14b may be joined to the

outer surfaces

11b and 11c by a resin adhesive such as an epoxy resin adhesive instead of joining by the

solder layers

15a and 15b. In this case, the metal tubes can be joined by maintaining the temperature of the adhesive at a temperature equal to or higher than the curing temperature (for example, about 150 ° C.) for a predetermined time.

The header portion 33 includes a fluid header portion 33a joined to both ends of the fluid metal tube 11 and a refrigerant header portion 33b joined to both ends of the coolant metal tube 13, respectively.

As shown in FIG. 3A, the refrigerant header portion 33b has a structure in which the header body 41, the end of the refrigerant metal tube 13 and the end of the refrigerant metal tube 14 are joined. . The header body 41 has a rectangular parallelepiped outer shape. Inside the header body 41, a coolant channel 41a through which a coolant can flow is formed. The refrigerant flow path 41a has a circular cross-sectional shape.

The side wall of the header body 41 is provided with an insertion port 41b into which the end of the refrigerant metal tube 13 is inserted, and an insertion port 41c into which the end of the refrigerant metal tube 14 is inserted. The end of the refrigerant metal tube 13 is joined to the header body 41 by an appropriate amount of brazing material 43 disposed between the inner surface of the insertion port 41 b and the outer surface of the refrigerant metal tube 13. Similarly, the end portion of the refrigerant metal tube 14 is joined to the header body 41 by an appropriate amount of brazing material 43 disposed between the inner surface of the insertion port 41 c and the outer surface of the refrigerant metal tube 14. The refrigerant flow path 13a of the refrigerant metal tube 13 and the refrigerant flow path 14a of the refrigerant metal tube 14 communicate with the refrigerant flow path 41a of the header body 41, respectively. The end portions of the

refrigerant metal tubes

13 and 14 may be joined to the header body 41 by fusion welding instead of joining by the brazing material 43.

The fluid header 33a has a structure in which the header main body 45 and the end of the fluid metal tube 11 are joined. The header main body 45 has a cylindrical shape. Inside the header body 45, a fluid channel 45a through which fluid can flow is formed. The header body 45 is disposed between the refrigerant metal tube 13 and the refrigerant metal tube 14 positioned above and below.

An insertion port 45 b into which the end of the fluid metal tube 11 is inserted is provided on the side wall of the header body 45. The end of the fluid metal tube 11 is joined to the header body 45 by an appropriate amount of brazing material 47 disposed between the inner surface of the insertion port 45 b and the outer surface of the fluid metal tube 11. The fluid flow path 11 a of the fluid metal pipe 11 communicates with the fluid flow path 45 a of the header body 45. It should be noted that a high-pressure refrigerant flows through the joint portion (fluid header joint portion) between the end of the fluid metal tube 11 and the fluid header portion 33a, like the refrigerant metal tube 13 and the refrigerant header portion 33b. Rather, relatively low pressure water circulates. For this reason, the joint portion is not required to have a high joint strength unlike the refrigerant header joint portion. Therefore, the end portion of the metal pipe for fluid 11 may be joined to the header body 45 by other joining methods such as soldering, fusion welding, joining with a resin adhesive, instead of joining with the brazing material 47. Good.

As shown in FIGS. 1A and 1B, each refrigerant header portion 33b has a pipe 41d through which the refrigerant in the refrigerant flow path 41a can enter and exit, and each fluid header section 33a has a fluid flow path. A pipe 45c through which the fluid in 45a can enter and exit is provided.

For example, a soldering device 35 shown in FIG. 4 can be used for soldering the

outer surfaces

11b and 11c of the fluid metal tube 11 and the

outer surfaces

13b and 14b of the

refrigerant metal tubes

13 and 14. The soldering device 35 includes an ultrasonic soldering iron 21 as the main heating unit 21a and the vibrating unit 21b, a heater 19 as an auxiliary heating unit, and a control unit 25 as a control unit.

The heater 19 of the soldering device 35 has a placement surface 19a on which an object to be heated (a temporary assembly 23 described later) is placed. The mounting surface 19a has a size that allows the entire lower surface of the temporary assembly 23 to be in surface contact. The heater 19 plays a role of heating the temporary assembly 23 in an auxiliary manner.

The ultrasonic soldering iron 21 functions as a main heating means 21a for heating the temporary assembly 23 to heat a solder layer 15 described later to a melting point or higher, and generates vibration of ultrasonic waves applied to the temporary assembly 23. And a function as a vibrating means 21b (or a vibrating means 21b for causing the temporary assembly 23 to generate vibration). In addition, an ultrasonic wave means a sound wave with a high frequency (frequency) so that an auditory sense does not occur.

This ultrasonic soldering iron 21 incorporates an unillustrated vibrator that generates ultrasonic vibrations and an unillustrated heater that heats the temporary assembly 23. The ultrasonic vibration generated by the vibrator and the heat generated by the heater are transmitted to the tip 22 of the ultrasonic soldering iron 21, respectively. The tip 22 of the ultrasonic soldering iron 21 in the present embodiment has a contact surface that comes into surface contact with the surface of the temporary assembly 23. This contact surface has a flat shape (a shape like the tip of a minus driver) whose width is larger than the thickness.

The control unit 25 controls the heater 19 and the ultrasonic soldering iron 21. The control unit 25 includes a central processing unit and a memory for storing various data. Specifically, the control unit 25 controls the temperature of the mounting surface 19a of the heater 19, the temperature of the tip 22 of the ultrasonic soldering iron 21, the frequency of ultrasonic vibration, and the like.

Further, the control unit 25 can perform position control for moving the ultrasonic soldering iron 21 and / or the heater 19 in the vertical direction. When the control unit 25 heats the temporary assembly 23 and applies ultrasonic vibration to the temporary assembly 23, the tip 22 of the ultrasonic soldering iron 21 is in contact with the surface of the temporary assembly 23. To control. On the other hand, the control unit 25 uses an ultrasonic soldering iron so that the temporary assembly 23 can be inserted between the mounting surface 19a and the tip 22 when the temporary assembly 23 is attached to or detached from the soldering device 35. The position of the tip portion 22 of 21 is controlled.

Further, for example, a small heating device 81 shown in FIG. 3 can be used for brazing the header body 41 with the end of the refrigerant metal tube 13 and the end of the refrigerant metal tube 14. Examples of the heating device 81 include heating means such as a high-frequency heating device, an infrared heater, a laser irradiation device, and an air heater.

Further, for example, a small heating device 83 shown in FIG. 3 can be used for joining the header main body 45 and the end of the fluid metal tube 11. Examples of the heating device 83 include heating means such as a high-frequency heating device, an infrared heater, laser irradiation, and an air heater, as described above.

As the material for the fluid metal pipe 11 and the

refrigerant metal pipes

13 and 14, a metal having thermal conductivity, corrosion resistance, rigidity, workability, and the like is used. Specifically, aluminum, copper, stainless steel, and the like are used. Can be illustrated. As a material for the solder layer 15, a material suitable for the material of the metal tube may be appropriately selected.

The laminated heat exchanger 17 can be used in the form of a straight line as shown in FIG. 1, but may be used after being bent into a spiral shape (not shown), for example.

<Manufacturing method>
Next, a method for manufacturing the laminated heat exchanger 17 will be described.

First, a fluid metal tube 11 and

refrigerant metal tubes

13 and 14 are prepared. These

metal tubes

11, 13, and 14 are obtained by extruding a metal material using, for example, dies each having an extrusion port having a cross-sectional shape of each metal tube as shown in FIG. It is done. Moreover, the header part 33a for fluids and the header part 33b for refrigerant | coolants are produced using a well-known shaping | molding method.

Next, the refrigerant header 33b is joined to the end of the refrigerant metal pipe 13 and the end of the refrigerant metal pipe 14 by brazing (refrigerant header joining step).

Specifically, in the state where the belt-shaped brazing material 43 is wound around the outer peripheral surface of each end of the

refrigerant metal tubes

13, 14, each end of the

refrigerant metal tubes

13, 14 is inserted into the insertion port 41 b of the header body 41. , 41c, and arranged as shown in FIG. Next, the brazing filler metal 43 and its surroundings are heated using the heating device 81 to raise the temperature of the brazing filler metal 43 to the melting point or higher, so that the end portions of the

refrigerant metal tubes

13 and 14 become the refrigerant header portion 33b. Braze.

When a high-frequency heating device is used as the heating device 81, for example, the brazing material 43 and its surroundings are formed by winding an induction coil around the ends of the

refrigerant metal tubes

13 and 14 and / or the header body 41 to flow a high-frequency current. Can be heated.

For example, a laser irradiation device can be used as the heating device 81. As the laser of the laser irradiation apparatus, for example, a lamp excitation YAG laser, a diode excitation YAG laser, a CO ₂ laser, or the like can be used. The output of the YAG laser can be adjusted to, for example, a range of about 20 W to 1.5 kW, and the output of the CO ₂ laser can be adjusted to, for example, about 250 W. These include the material and thickness of the metal tube and solder material, etc. What is necessary is just to set suitably according to.

Also, instead of brazing, when joining by fusion welding, arc welding such as TIG welding and MIG welding, resistance welding such as spot welding and seam welding, and the like can be used.

Next, the fluid header 33a is joined to the end of the fluid metal tube 11 by brazing or the like (fluid header joining step). When joining by brazing, it may be the same as in the case of the header joining process for refrigerant. Also, in the case of bonding using a solder material, a resin adhesive, or the like, the solder material or the resin adhesive is disposed in the same manner as described above, and is heated and bonded by the heating device 81.

Next, as shown in FIG. 5A, the refrigerant metal tube 13, the solder layer 15a, the fluid metal tube 11, the solder layer 15b, and the refrigerant metal tube 14 are laminated in this order in the thickness direction and temporarily assembled. The body 23 is molded (molding process: FIG. 5B). The fluid metal pipe 11 and the

refrigerant metal pipes

13 and 14 are stacked and arranged with their longitudinal directions aligned in the same direction.

As the solder layers 15a and 15b, for example, those previously formed into a sheet shape (foil shape) can be used. Further, for example, a cream-like solder material is used and applied to the

outer surfaces

11b and 11c of the fluid metal tube 11 and / or the

outer surfaces

13b and 14b of the

refrigerant metal tubes

13 and 14, and the solder layers 15a and 15b. May be formed. Alternatively, solder layers 15a and 15b may be formed on the

outer surfaces

11b and 11c by spraying a solder material onto the

outer surfaces

11b and 11c of the metal pipe 11 for fluid.

Next, the temporary assembly 23 is heated to join the refrigerant metal tube 13 and the fluid metal tube 11 with the solder layer 15 (metal tube joining step). Specifically, first, as shown in FIG. 6, the temporary assembly 23 is placed on the placement surface 19 a of the heater 19 of the soldering device 35. At this time, almost the entire lower surface of the refrigerant metal tube 14 in the temporary assembly 23 is in surface contact with the mounting surface 19a.

Next, the control unit 25 performs control so that the temporary assembly 23 is auxiliary heated by the heater 19. The control unit 25 controls the heater 19 based on the temperature of the temporary assembly 23 measured by a temperature sensor (not shown). In this step, the temporary assembly 23 is heated so that the solder layer 15 (15a, 15b) is in a semi-molten state. The temperature at which the solder layer 15 becomes a semi-molten state refers to a temperature between the solidus temperature and the liquidus temperature of the solder material constituting the solder layer 15. For example, when the melting point of the solder material is 245 ° C. and 200 ° C. is included between the solidus temperature and the liquidus temperature of the solder material, the heater 19 is set to about 200 ° C., for example. The solder layer 15 can be brought into a semi-molten state by auxiliary heating of the temporary assembly 23 by adjusting the temperature.

Next, after detecting that the solder layer 15 is in a semi-molten state by the temperature sensor, the control unit 25 applies ultrasonic vibrations to the temporary assembly 23 by the ultrasonic soldering iron 21 and also solder layer 15. The temporary assembly 23 is subjected to main heating so that the temperature of is higher than the melting point. By this main heating, the solder layer 15 is melted and the metal pipe for fluid 11 and the metal pipes for

refrigerant

13 and 14 are joined. As a specific example, when the melting point of the solder material is 245 ° C., for example, the tip 22 of the ultrasonic soldering iron 21 is adjusted to a temperature of about 350 ° C. to 400 ° C., for example. Thereby, almost the entire temporary assembly 23 is heated to about 260 ° C. As the heating means, for example, a high-frequency heating device, a laser irradiation device, an infrared heater, an air heater, a torch or the like may be used together with or instead of the ultrasonic soldering iron 21.

In this metal tube joining process, the control unit 25 controls the ultrasonic soldering iron 21. The ultrasonic soldering iron 21 is controlled by the control unit 25 so that the tip 22 of the ultrasonic soldering iron 21 is in contact with the upper surface of the temporary assembly 23 (the upper surface of the refrigerant metal tube 13). Move in the direction and longitudinal direction. As a result, ultrasonic vibration is uniformly applied to almost the entire temporary assembly 23 and heated. The main heating of the temporary assembly 23 may be performed not after the application of vibration but after the application of vibration to the temporary assembly 23 is completed. Moreover, the front-end | tip part 22 of the ultrasonic soldering iron 21 is not limited to flat shape, For example, other shapes, such as column shape and prismatic shape, may be sufficient.

Conditions for joining such as the temperature of the mounting surface 19 a of the heater 19, the temperature of the tip 22 of the ultrasonic soldering iron 21, the frequency, amplitude, vibration applying time, and heating time of the ultrasonic wave are controlled by the control unit 25. Be controlled. These conditions are appropriately set according to the material and thickness of each metal tube and the material of the solder layer 15.

<Outline of Embodiment>
The above embodiment is summarized as follows.

(1) The stacked heat exchanger includes a metal pipe for refrigerant, a metal pipe for fluid, a header section for refrigerant, and a header section for fluid. The refrigerant metal tube is capable of circulating a refrigerant therein. The fluid metal tube has a solder layer in which a fluid exchanging heat with the refrigerant can flow, and is stacked on the refrigerant metal tube and interposed between the refrigerant metal tube and the fluid metal tube. Alternatively, it is joined to the refrigerant metal tube by a resin adhesive layer. The refrigerant header is joined to the end of the metal pipe for refrigerant by brazing or fusion welding. The fluid header portion is joined to the end of the fluid metal tube.

In this configuration, the joint portion (refrigerant header joint portion) between the end of the coolant metal tube and the coolant header portion is joined by brazing or fusion welding, while the refrigerant metal arranged in a stacked manner. A joint portion between the pipe and the metal pipe for fluid, that is, a joint portion between the outer surfaces of the metal pipe is joined by a solder material or a resin adhesive.

Here, brazing refers to a joining method performed using a solder having a melting point of 450 ° C. or higher, and soldering refers to a joining method performed using solder having a low melting point of less than 450 ° C. The fusion welding includes arc welding such as TIG welding and MIG welding, resistance welding such as spot welding and seam welding, and the like.

The refrigerant header joint portion communicates in a liquid-tight state (a state in which the refrigerant does not leak to the outside) between the refrigerant metal passage through which the high-pressure refrigerant circulates and the refrigerant header portion through which the high-pressure refrigerant circulates. It is necessary to let Therefore, the refrigerant header joint portion is required to have high joint strength. Therefore, in this configuration, it is possible to ensure the joining reliability of the refrigerant header joint portion by joining the header joint portion for refrigerant by brazing or fusion welding having excellent joint strength. Thereby, the header joint part for refrigerant is maintained in a liquid-tight state. In this way, in a relatively narrow range brazing (local brazing) of the header joint portion for refrigerant, a heating furnace that can be adjusted to a high temperature atmosphere is not necessary. For example, a high-frequency heating device and an infrared heater as described later are used. A small heating device such as a laser irradiation device or an air heater can be used. Also, a heating furnace is not required when the header joint portion for refrigerant is joined by fusion welding.

On the other hand, since the coolant does not flow through the joint portion between the outer surfaces of the coolant metal tube and the fluid metal tube, the joint strength thereof does not need to be as high as that of the coolant header joint portion. Therefore, in this configuration, the joint portions of the outer surfaces that are joined over a wide range in a state of surface contact with each other are joined using a solder material or a resin adhesive. Regardless of whether solder material or resin adhesive is used, it is possible to join in a low temperature atmosphere compared to brazing material, so a heating furnace that can be adjusted to a high temperature atmosphere as required for brazing Is unnecessary.

Therefore, according to the stacked heat exchanger of this configuration, a large-sized heating furnace that can be adjusted to a high temperature atmosphere at the time of manufacture is unnecessary, and a liquid-tight state can be maintained even when parts subjected to high pressure are joined. it can.

(2) The manufacturing method of the laminated heat exchanger includes a refrigerant metal pipe through which a refrigerant can circulate, and a stacked arrangement with respect to the metal pipe for the refrigerant, and a fluid that exchanges heat with the refrigerant circulates through the inside. It is for producing a laminated heat exchanger with a possible metal tube for fluid. This manufacturing method includes a header joining process for refrigerant, a header joining process for fluid, a forming process, and a metal pipe joining process. In the refrigerant header joining step, the refrigerant header part is joined to the end of the refrigerant metal pipe by brazing or fusion welding. In the fluid header joining step, a fluid header portion is joined to an end portion of the fluid metal pipe. In the molding step, the refrigerant metal tube and the fluid metal tube are laminated with a solder layer or a resin adhesive layer interposed therebetween to form a temporary assembly. In the metal pipe joining step, at least after the refrigerant header joining step, the temporary assembly is heated to join the refrigerant metal tube and the fluid metal tube with the solder layer or the resin adhesive layer.

In this method, the metal pipe joining step is performed after the refrigerant header joining step. If the refrigerant header joining step is performed after the metal tube joining step, the solder layer or the resin adhesive layer joining the metal tubes in the metal tube joining step is either brazed or fused in the refrigerant header joining step. There is a possibility that problems such as softening, melting, and decomposition occur due to exposure to a high temperature atmosphere, but according to the present method, such problems can be prevented from occurring. In addition, as described above, there is provided a stacked heat exchanger that does not require a large heating furnace that can be adjusted to a high temperature atmosphere at the time of manufacture, and that can maintain a liquid-tight state even when parts subjected to high pressure are joined. be able to.

(3) In the metal tube joining step of the manufacturing method, it is preferable to apply ultrasonic vibration to the temporary assembly.

In this method, since the ultrasonic vibration is applied to the temporary assembly in the metal tube joining step, the oxide film on the outer surface of the metal tube can be effectively removed. Thereby, the joining reliability of metal tubes is further improved.

(4) In the metal tube joining step of the manufacturing method, it is preferable that the ultrasonic vibration is applied to the temporary assembly that has been auxiliary heated so that the solder layer is in a semi-molten state.

In this method, the temporary assembly is auxiliary heated so that the solder layer is at a temperature at which the solder layer is in a semi-molten state (a temperature between the solidus temperature and the liquidus temperature). Since ultrasonic vibration is applied, the oxide removal effect by ultrasonic vibration can be further enhanced. The reason is estimated as follows. That is, when the solder layer is a solid phase (when the temperature of the solder layer is equal to or lower than the solidus temperature), an air layer is easily formed between the metal tube and the solder layer. When such an air layer exists, for example, the vibration of the ultrasonic wave applied to the fluid metal tube may be blocked or attenuated in the air layer, so that it is difficult to be transmitted to the refrigerant metal tube. On the other hand, when the solder layer is in a semi-molten state, the air layer is reduced, so that ultrasonic vibration is efficiently transmitted from the fluid metal tube to the refrigerant metal tube through the solder layer. In addition, when the solder layer is in a semi-molten state, the shape stability of the solder layer itself is maintained as compared to when it is in a molten state, so there is a shift in the relative positional relationship between the metal tube and the solder layer. It becomes difficult to occur.

(5) In the metal pipe joining step of the manufacturing method, the ultrasonic vibration is applied to the temporary assembly using an ultrasonic soldering iron, and the temperature of the solder layer is set to a melting point or higher. Is preferred.

In this method, in the metal pipe joining step, the ultrasonic vibration is applied to the temporary assembly using an ultrasonic soldering iron and the temperature of the solder layer is set to the melting point or higher. Thereby, ultrasonic vibration provision and metal tube heating joining can be performed with one instrument (ultrasonic soldering iron). Thereby, the structure of the apparatus can be simplified.

As a specific brazing material heating method in the refrigerant header joining step, for example, high-frequency heating can be used.

<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, in the above embodiment, the case where the vibration treatment and the heat treatment are performed using an ultrasonic soldering iron has been described as an example, but the present invention is not limited to this. For example, the soldering device 35 may include vibration means and heating means provided separately from each other.

In the above embodiment, the case where the soldering device 35 includes the control unit 25 that controls the auxiliary heating unit 19, the main heating unit 21a, and the vibration unit 21b has been described as an example. However, the present invention is not limited thereto. . For example, in the soldering device 35, the auxiliary heating means 19, the main heating means 21a, and the vibration means 21b may be manually controlled (operated) by an operator.

In the above embodiment, the case where heat is exchanged between water and the refrigerant has been described as an example. However, the stacked heat exchanger according to the present invention is configured such that the refrigerant and another fluid (for example, a gas such as air) are exchanged. It may be used for heat exchange or for heat exchange between refrigerants.

Moreover, in the said embodiment, the metal pipe 13 for refrigerant | coolants, the metal pipe 11 for fluid, and the metal pipe 14 for refrigerant | coolants have the three metal pipes laminated | stacked in this order, the metal pipe 13 for refrigerant | coolants, and the metal pipe for fluids The embodiment has been described by taking as an example a form having two metal tubes 11 laminated in this order, but may be a form in which four or more metal tubes are laminated.

In the above-described embodiment, the case where each metal tube has a flat shape whose width is larger than the thickness has been described as an example. However, the present invention is not limited to this. Each metal tube may have, for example, the same size as the thickness and the width, or may have a shape in which the thickness is larger than the width.

Further, as the auxiliary heating means for the temporary assembly 23, other heating means such as laser and high frequency heating can be used in addition to the heater 19 described above.

11 Metal Pipe for Fluid 13 Metal Pipe for Refrigerant 14 Metal Pipe for Refrigerant 15 Solder Layer 17 Laminated Heat Exchanger 19 Heater 21 Ultrasonic Soldering Iron 21a Main Heating Means 21b Vibrating Means 23 Temporary Assembly 25 Control Unit 29 Roller 31 Heat Exchanger 33 Header

33a Fluid Header

33b Refrigerant Header 35 Soldering Device

Claims

A refrigerant metal pipe (13) through which a refrigerant can flow;
A fluid that exchanges heat with the refrigerant can be circulated, and is stacked on the metal pipe for refrigerant (13) and interposed between the metal pipe for refrigerant (13) or a resin layer A fluid metal pipe (11) joined to the refrigerant metal pipe (13) by an adhesive layer;
A refrigerant header (33b) in which the end of the refrigerant metal pipe (13) is joined by brazing or fusion welding; and
A laminated heat exchanger comprising: a fluid header (33a) joined to an end of the fluid metal pipe (11).
A laminate comprising a refrigerant metal tube (13) through which a refrigerant can circulate, and a fluid metal tube (11) arranged on the refrigerant metal tube (13) and through which a fluid exchanging heat with the refrigerant can circulate. A method for producing a mold heat exchanger, comprising:
A refrigerant header joining step of joining the refrigerant header (33b) to the end of the refrigerant metal pipe (13) by brazing or fusion welding;
A fluid header joining step of joining a fluid header portion (33a) to an end of the fluid metal pipe (11);
The refrigerant metal pipe (13) and the fluid metal pipe (11) are laminated with a solder layer (15) or a resin adhesive layer interposed therebetween, and a temporary assembly (23) is obtained. Molding process to mold;
At least after the refrigerant header joining step, the temporary assembly (23) is heated to bond the refrigerant metal pipe (13) and the fluid metal pipe (11) to the solder layer (15) or resin. A metal pipe joining step for joining by layers, and a method for manufacturing a laminated heat exchanger.
The method for manufacturing a stacked heat exchanger according to claim 2, wherein in the metal tube joining step, ultrasonic vibration is applied to the temporary assembly (23).
The lamination according to claim 3, wherein in the metal tube joining step, the ultrasonic vibration is applied to the temporary assembly (23) that is auxiliary-heated so that the solder layer (15) is in a semi-molten state. A manufacturing method of a mold heat exchanger.
The said metal pipe joining process WHEREIN: The vibration of the said ultrasonic wave is provided to the said temporary assembly (23) using an ultrasonic soldering iron, and the temperature of the said solder layer (15) is made more than melting | fusing point. 4. A method for producing a stacked heat exchanger according to 4.
In the refrigerant header joining step, the brazing material is heated by high-frequency heating in a state where a brazing material is disposed between the end of the refrigerant metal pipe (13) and the refrigerant header portion (33b), and the refrigerant The method for manufacturing a stacked heat exchanger according to any one of claims 2 to 5, wherein the refrigerant header (33b) is joined to the end of the metal pipe (13).