JP4830131B2 - Micro heat exchanger and manufacturing method thereof - Google Patents

Description

  The present invention relates to a micro heat exchanger and a method for manufacturing the same, and more specifically, a plurality of heat exchanges formed as a flat hollow tube having a thickness of 0.5 mm or less with a metal material and arranged in parallel at predetermined intervals. The present invention relates to a micro heat exchanger for cooling a refrigerant flowing in a tube by heat exchange with outside air and a method for manufacturing the same.

  Conventionally, a heat exchanger of this type has been proposed that includes a plurality of tubes that circulate refrigerant between an inlet tank and an outlet tank of the refrigerant and exchange heat with the outside air (see, for example, Patent Document 1). In this heat exchanger, the refrigerant flowing into the inlet tank is cooled by exchanging heat between the plurality of tubes and the outside air passing between the tubes substantially vertically while passing through the plurality of tubes and reaching the outlet tank. And in order to improve heat exchange efficiency, the cooling fin is attached between several tubes.

There has also been proposed one having a plurality of pipes having a reduced diameter for circulating the refrigerant through two headers forming an inlet and an outlet of the refrigerant and exchanging heat with the outside air (for example, refer to Patent Document 2). In this heat exchanger, the refrigerant is circulated through a plurality of tubes having a reduced diameter, and the refrigerant is cooled by exchanging heat between the plurality of tubes and the outside air.
Japanese Patent Laid-Open No. 2001-167782 JP 2004-218969 A

  In general, heat exchangers used for computers, home appliances, and the like are desired to have high heat exchange efficiency, small size, light weight, and good assembly. In the former heat exchanger described above, extrusion molding or pressure welding is performed in order to maintain the pressure resistance of the tube, making it difficult to reduce the size and weight.

  Further, in the latter heat exchanger described above, since the pipe is reduced in diameter, the strength of the pipe decreases, and the pipe may be bent or crushed during assembly. In addition, since a large number of tubes need to be attached to the header, the assemblability is deteriorated.

  One object of the micro heat exchanger and the manufacturing method thereof of the present invention is to reduce the size and weight of the heat exchanger. Another object of the micro heat exchanger and the manufacturing method thereof of the present invention is to improve the heat exchange efficiency. Furthermore, it is an object of the micro heat exchanger and the manufacturing method thereof of the present invention to improve the assemblability of the heat exchanger.

  The micro heat exchanger and the manufacturing method thereof according to the present invention employ the following means in order to achieve at least a part of the above-described object.

The micro heat exchanger of the present invention is
Micro heat exchange that cools the refrigerant flowing through a plurality of heat exchange tubes arranged in parallel at predetermined intervals by heat exchange with the outside air, formed as a flat hollow tube having a thickness of 0.5 mm or less with a metal material. A vessel,
Joining a flow path forming portion for forming a flow path for refrigerant supply / discharge formed on both flat surfaces near both ends of the heat exchange tube to a flow path forming portion of an adjacent heat exchange tube Consisting of,
It is characterized by that.

  In the micro heat exchanger according to the present invention, the heat exchange tube adjacent to the flow path forming portion of a plurality of heat exchange tubes formed as a flat hollow tube having a thickness of 0.5 mm or less by a metal material is used. Since the micro heat exchanger is configured by joining with the flow path forming portion, it can be made smaller and lighter than those equipped with headers for flowing in and out of the refrigerant and the heat exchanger can be assembled. Can be made good. Further, by forming the heat exchange tube as a flat hollow tube, the contact area with the outside air can be increased, and the heat exchange efficiency can be improved.

  In such a micro heat exchanger of the present invention, the flow path forming portion is formed as a first diameter tube having a length adjusted to the length of the predetermined interval on one of the two flat surfaces. And a second tube portion formed as a tube having a second diameter with the inner diameter of the first tube portion being substantially the outer diameter at a position aligned with the first tube portion on the other of the two flat surfaces, The second pipe part of the heat exchange tube may be joined in a state of being inserted into the first pipe part of the adjacent heat exchange tube. In this way, positioning at the time of joining with adjacent heat exchange tubes can be facilitated, and the intervals between the heat exchange tubes can be set to predetermined intervals with high accuracy. Can be made good. Moreover, since it joins in the state which inserted the 2nd pipe part in the 1st pipe part, the sealing performance of a junction part can be made higher. In this case, the end face of the first pipe portion of the heat exchange tube may be joined at a position where it abuts against the flat surface of the adjacent heat exchange tube.

  Further, in the micro heat exchanger according to the present invention, the flow path forming portion has a tube portion whose length is adjusted to the length of the predetermined interval on one of the two flat surfaces and formed as a tube having a predetermined diameter, A through hole having a diameter equal to the inner diameter of the tube portion formed at a position aligned with the other tube portion of the two flat surfaces, and penetrating the adjacent heat exchange tube through the tube portion of the heat exchange tube. It can also be characterized by being joined to a hole. If it carries out like this, the space | interval of the heat exchange tube at the time of joining with the adjacent heat exchange tube can be made into a predetermined space | interval with high precision, and the assembly | attachment property of a micro heat exchanger can be made favorable. . In this case, a flange may be formed at the joining end portion of the pipe portion. If it carries out like this, the sealing performance of a junction part can be made higher.

  Furthermore, in the micro heat exchanger according to the present invention, the flow path forming portion is a first pipe formed as a pipe having a predetermined diameter and having a length adjusted to a length shorter than the predetermined interval on one of the two flat surfaces. And a pipe having a predetermined diameter adjusted to a length obtained by subtracting the length of the first pipe section from the length of the predetermined interval at a position aligned with the pipe section on the other side of the two flat surfaces. It is a 2nd pipe part, Comprising: The 1st pipe part of the said heat exchange tube and the 2nd pipe part of the heat exchange tube adjacent can be joined, It can also be characterized by the above-mentioned. If it carries out like this, the space | interval of the heat exchange tube at the time of joining with the adjacent heat exchange tube can be made into a predetermined space | interval with high precision, and the assembly | attachment property of a micro heat exchanger can be made favorable. . In this case, a flange may be formed at the joining end portion of the first tube portion and the second tube portion. If it carries out like this, the sealing performance of a junction part can be made higher.

  Alternatively, in the micro heat exchanger according to the present invention, the heat exchange tube may be formed as a plurality of hollow tubes to be coupled at least in the flow path forming portion. In this way, the pressure strength of the heat exchange tube can be increased.

  Further, in the micro heat exchanger according to the present invention, the heat exchange tube is formed in a substantially B-shaped cross section so as to form two hollow tubes in a portion including the flow path forming portion, and the two hollow tubes The flow path forming portion may be formed so as to supply and discharge the refrigerant to and from the pipe. In this way, the pressure strength of the heat exchange tube can be increased.

  In the micro heat exchanger of the present invention, the heat exchange tube may be a tube having inner fins joined to both inner flat surfaces. In this way, the pressure strength of the heat exchange tube can be increased. In this case, the inner fin may be arranged so that the flow resistance of the refrigerant in the heat exchange tube does not increase. If it carries out like this, the pressure-resistant intensity | strength of the tube for heat exchange can be made high, and the fall of heat exchange efficiency can be suppressed.

  In the micro heat exchanger according to the present invention, both ends of the heat exchange tube may be sealed using a crushing process. If it carries out like this, the both ends of the tube for heat exchange can be sealed easily.

  In the micro heat exchanger according to the present invention, both ends of the heat exchange tube may be sealed using a bending process. If it carries out like this, the both ends of the tube for heat exchange can be sealed easily.

  In the micro heat exchanger according to the present invention, the heat exchange tube may be formed by bending the flow path forming portion into a plate material having a thickness of 0.1 mm or less. In this case, the heat exchange tube may be formed by processing the flow path forming portion using burring.

The manufacturing method of the micro heat exchanger of the present invention includes:
Micro heat exchange that cools the refrigerant flowing through a plurality of heat exchange tubes arranged in parallel at predetermined intervals by heat exchange with the outside air, formed as a flat hollow tube having a thickness of 0.5 mm or less with a metal material. A method of manufacturing a vessel,
After the flow path forming portion for forming the flow path for supplying and discharging the refrigerant formed on both the flat surfaces near both ends of the heat exchange tube is formed on a plate material having a thickness of 0.1 mm or less, A tube forming step of forming an empty tube, and further sealing both ends to form the heat exchange tube,
A joining step of joining the flow path forming portions of the plurality of heat exchange tubes to the flow path forming portions of the adjacent heat exchange tubes;
Is used to manufacture a micro heat exchanger.

  In the manufacturing method of the micro heat exchanger according to the present invention, a flow path for supplying and discharging the refrigerant formed on both flat surfaces in the vicinity of both ends of the heat exchange tube is formed on a plate material having a thickness of 0.1 mm or less. The tube for heat exchange is formed by the tube forming process that forms the hollow tube by bending after forming the flow path forming part and then seals both ends to form the tube for heat exchange. Can be formed. In addition, micro heat exchangers are manufactured using a joining process that joins the flow path forming portions of a plurality of heat exchange tubes to the flow path forming portions of adjacent heat exchange tubes, so that the assembly of the micro heat exchanger is good Can be. And since the manufactured micro heat exchanger is not provided with the header etc. which flow in and out of a refrigerant | coolant, it can be made small and lightweight compared with what is provided with a header etc. Moreover, since the heat exchange tube is formed as a flat hollow tube, the contact area with the outside air can be increased to improve the heat exchange efficiency.

  In the method for manufacturing a micro heat exchanger according to the present invention, the tube forming step may be a step of processing the flow path forming portion using burring. Moreover, the said tube formation process can also be a process of sealing using welding by brazing. Furthermore, the joining step may be a step of welding by brazing.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a block diagram showing an outline of the configuration of a micro heat exchanger 20 as an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing an example of an AA cross section of the micro heat exchanger 20 in FIG. 3 is a cross-sectional view showing an example of a cross section at the center of the tube 30 constituting the micro heat exchanger 20. As shown in the figure, the micro heat exchanger 20 of the embodiment is configured by joining a plurality of tubes 30 with four refrigerant supply / discharge channels 40a, 40b, 42a, and 42b.

  As shown in FIG. 3, the tube 30 is substantially B partitioned by two flat heat exchange channels 44 a and 44 b having a thickness of 0.5 mm using a plate material made of a stainless material having a thickness of 0.1 mm. It is formed as a hollow tube having a letter shape. Both end portions 36 of the tube 30 are sealed by crushing and brazing. In the vicinity of both ends 36 of the tube 30 on the surface side in FIG. 1 (the lower surface side in FIG. 3), a first tube portion having an inner diameter of 2.5 mm and a length of 0.8 mm communicating with the heat exchange channels 44a and 44b. In the vicinity of both end portions 36 on the back surface side (upper surface side in FIG. 3) of the tube 30, the outer diameter communicating with the heat exchange channels 44 a and 44 b is 2.5 mm and long. Four second pipe portions 34 having a length of 0.8 mm are formed.

  Refrigerant supply / exhaust flow paths 40a, 40b, 42a, and 42b that join adjacent tubes 30 are fitted into the second tube portion 34 of the tube 30 adjacent to the first tube portion 32 of the tube 30, and the first tube portion 32 is inserted. It is configured by joining by brazing at a position in contact with the adjacent tube 30. Accordingly, the plurality of tubes 30 are arranged in parallel with high accuracy at intervals of the length (0.8 mm) of the first pipe portion 32.

  Now, the refrigerant is supplied using the refrigerant supply / discharge flow paths 40a, 40b of the micro heat exchanger 20 as the refrigerant supply flow path, the refrigerant is discharged using the refrigerant supply / discharge flow paths 42a, 42b as the refrigerant discharge flow path, If the outside air is circulated between the plurality of tubes 30, the refrigerant flowing in the two heat exchange channels 44a and 44b can be cooled by heat exchange with the outside air. As described above, since the thickness of the plate material forming the tube 30 is 0.1 mm and the thickness of the tube 30 is 0.5 mm, the two heat exchange channels 44a and 44b are flat with a thickness of 0.3 mm. Formed as a simple flow path. For this reason, even if it does not attach a fin to the outer peripheral surface of the tube 30, it has a high heat exchange characteristic.

  Next, how the micro heat exchanger 20 configured in this way is manufactured will be described. FIG. 4 is a process diagram illustrating an example of a manufacturing process of the micro heat exchanger 20 according to the embodiment. The micro heat exchanger 20 of the embodiment includes a tube forming step (S100) for forming the tube 30, an assembling step (S200) for assembling the formed tube 30 and a joining step for joining the assembled tube 30 by brazing ( S210). The tube 30 is formed by first forming a die having an inner diameter of 1.4 mm and a diameter of 1 in order to form the refrigerant supply / discharge channels 40a, 40b, 42a and 42b on a plate made of a stainless material having a thickness of 0.1 mm. 5 is formed using a 4 mm punch to form a hole opening member 30a illustrated in FIG. 5 (S110), and four holes positioned inside among the eight holes of the hole opening member 30a are formed. For the hole, burring is performed using a die having an inner diameter of 2.5 mm and a punch having an outer diameter of 2.3 mm, and four first pipe portions 32 on the inner side and four second pipe portions 34 on the outer side. The tube forming member 30b formed with is formed (S120). Subsequently, both ends of the tube forming member 30b are bent to form partition walls 31a and 31b that form partitions of the heat exchange channels 44a and 44b as illustrated in FIG. 7, and as illustrated in FIGS. A bending member 30c is formed by bending (S130), and both ends of the bending member 30 are crushed to form a pre-joining tube 30d that is identical in appearance to the tube 30 as illustrated in FIG. 10 (S140). ). And the partition walls 31a and 31b and the edge part 36 are joined by brazing, and the tube 30 is completed (S150). The assembling step (S200) is performed by connecting the plurality of tubes 30 by inserting the second tube portion 34 of the completed tube 30 into the first tube portion 32 of the adjacent tube 30, and the joining step (S210). ) Is performed by joining the connecting portions of the first tube portion 32 and the second tube portion 34 of each tube 30 by brazing.

  Next, the usage example of the micro heat exchanger 20 of an Example is demonstrated. FIG. 11 is a configuration diagram of a usage example in which the micro heat exchanger 20 of the embodiment is used for cooling the CPU 14 included in the computer 10. As shown in the figure, a water jacket 15 attached to the CPU 14 of the computer 10 of the use example and a micro heat exchanger 20 of the embodiment attached to the back surface of the computer 10 together with the blower 16 are connected by a communication pipe 18. The refrigerant flows through the tube 30 of the micro heat exchanger 20 by circulating the refrigerant through the water jacket 15 and the micro heat exchanger 20 using the communication pipe 18 and blowing the air in the computer 10 from the blower 16 to the outside. The refrigerant is cooled by heat exchange with the outside air, thereby cooling the CPU 14 of the computer 10.

  According to the micro heat exchanger 20 of the embodiment described above, a plurality of tubes formed as flat hollow tubes having a thickness of 0.5 mm or less by a plate made of a stainless material having a thickness of 0.1 mm. Since the micro heat exchanger 20 is configured by assembling and joining the first pipe portion 32 and the second pipe portion 34, the size and weight of the micro heat exchanger 20 are smaller than those provided with a header for flowing in and out of the refrigerant. In addition, the assembly property of the micro heat exchanger 20 can be improved. Further, by forming the tube 30 as a flat hollow tube, the contact area with the outside air can be increased and the heat exchange efficiency can be improved. Further, a second pipe portion 34 having an outer diameter of 2.5 mm and a length of 0.8 mm is fitted into the first pipe portion 32 having an inner diameter of 2.5 mm and a length of 0.8 mm. Since it joins in the state which the edge part contact | abutted to the adjacent tube 30, the some tube 30 can be arrange | positioned in parallel at equal intervals with high precision. As a result, positioning when assembling the plurality of tubes 30 can be facilitated, and the heat exchange efficiency of the micro heat exchanger 20 can be improved. Further, since the tube 30 is formed as a substantially B-shaped hollow tube partitioned by the two heat exchange channels 44a and 44b, the pressure resistance of the tube 30 can be increased.

  In addition, according to the method for manufacturing the micro heat exchanger 20 of the present invention, the tube 30 is formed by punching, burring, bending, crushing, and joining in a plate formed of a stainless material having a thickness of 0.1 mm. Therefore, the tube 30 can be easily mass-produced with high accuracy. Moreover, the 2nd pipe part 34 formed in the tube 30 adjacent to the 1st pipe part 32 formed in the tube 30 is inserted, and the edge part of the 2nd pipe part 34 will be in the state contact | abutted to the tube 30. Since it joins and joins, the positioning in the case of the assembly | attachment of the some tube 30 can be made easy, and an assembly property can be made favorable.

  In the micro heat exchanger 20 of the embodiment and the manufacturing method thereof, a plurality of tubes 30 formed as flat hollow tubes having a thickness of 0.5 mm or less by a plate material formed of a stainless material having a thickness of 0.1 mm. However, the plate material forming the tube 30 may be a material other than stainless steel, for example, a metal material such as copper or aluminum, and the thickness of the plate material forming the tube 30 is 0. It is not limited to 0.1 mm, and may be 0.1 mm or less such as 0.075 mm, 0.05 mm, or 0.025 mm. In addition, the thickness of the tube 30 is not limited to 0.5 mm, and may be 0.5 mm or less in consideration of the thickness of the plate material forming the tube 30.

  In the micro heat exchanger 20 of the embodiment, the tube 30 includes a first tube portion 32 having an inner diameter of 2.5 mm and a length of 0.8 mm, and a second tube portion having an outer diameter of 2.5 mm and a length of 0.8 mm. However, the inner diameter and the outer diameter of the first tube portion 32 and the second tube portion 34 are not limited to these, and may be any size. Further, the interval between adjacent tubes 30 is not limited to 0.8 mm, and may be any interval.

  In the micro heat exchanger 20 of the embodiment, the tube 30 includes a first tube portion 32 having an inner diameter of 2.5 mm and a length of 0.8 mm, and a second tube portion having an outer diameter of 2.5 mm and a length of 0.8 mm. 34, and the micro heat exchanger 20 is configured by inserting and joining the second pipe portion 34 of the tube 30 adjacent to the first pipe portion 32. In the modification of FIG. As shown in the micro heat exchanger 120, the tube 130 is formed with a through hole 132 and a tube part 134 having a flange 135 formed therein, and the flange 135 of the tube part 134 of the tube 130 is formed between the through hole 132 of the adjacent tube 130. It is good also as what comprises the micro heat exchanger 120 by making it contact | abut and join to an outer peripheral surface. In this case, the length of the tube part 134 is the interval between the adjacent tubes 130. 13, tube portions 232 and 234 in which flanges 233 and 235 having the same diameter are formed are formed on the tube 230, and the flange of the tube portion 232 of the tube 230 is formed. The micro heat exchanger 220 may be configured by bringing 233 into contact with and joining to the flange 235 of the tube portion 234 of the adjacent tube 130. In this case, the sum of the length of the tube portion 232 and the length of the tube portion 23434 is the interval between the adjacent tubes 230.

  In the micro heat exchanger 20 of the embodiment, the end portion 36 of the tube 30 is formed by crushing, but the end portion 336 is formed by bending as illustrated in the tube 330 of the modified example of FIG. It may be a thing. Further, as illustrated in the tube 430 of the modification of FIG. 15, the end portion 436 may be formed by drawing. In these cases, the end portions 336 and 436 may be joined by brazing to ensure a seal.

  In the micro heat exchanger 20 of the embodiment, the tube 30 is formed in a substantially B shape so that the two heat exchange channels 44a and 44b are formed, but the tube of the modified example of FIGS. As illustrated in FIG. 530, the partition walls 545a and 545b are divided into two heat exchange channels 544a1, 544a2, 544b1, and 544b2 by dividing each of the two heat exchange channels 44a and 44b in the tube 30 of the embodiment into wax. It may be formed by bonding. In this case, each of the two heat exchange channels 544a1, 544a2, 544b1, and 544b2 becomes two heat exchange channels 44a and 44b in the tube 30 of the embodiment in the vicinity of the refrigerant supply / discharge channels 540a, 540b, 542a, and 542b. What is necessary is just to form so that it may merge. In this way, the pressure resistance strength of the tube 530 can be further improved by the partition walls 545a and 545b. In addition, like the tube 530 of the modified example, ribs protruding inward from both flat surfaces are formed, and the ribs formed on both sides are joined by brazing in a state where the tops of the ribs are in contact with each other, thereby separating the partition walls 545a and 545b. As shown in the tube 630 of the modified example of FIG. 18, a rib that protrudes inward only on one of the flat surfaces is formed, and the top of the rib is in contact with the other surface. By joining by brazing, the two heat exchange channels 44a and 44b in the tube 30 of the embodiment are each divided into two to form partition walls 645a and 645b which are respectively two heat exchange channels 644a1, 644a2, 644b1 and 644b2. It is good also as what to do.

  In the micro heat exchanger 20 of the embodiment, the two heat exchange flow paths 44a and 44b formed in the tube 30 are hollow, but two heat exchange flows are exemplified as illustrated in the tube 730 of the modification of FIG. The paths 744a and 744b may include inner fins 750. The inner fin 750 of the tube 730 of this modified example is formed in a bowl shape as illustrated in FIG. 20, and is inserted into the two heat exchange flow paths 744a and 744b and then both ends of the tube 730 are brazed. It is joined inside the plane. By providing such an inner fin 750, the pressure resistance of the tube 730 can be further improved. The inner fin 750 may have any shape, but preferably has a shape in which the flow resistance is small so as not to hinder the flow of the refrigerant flowing through the two heat exchange channels 744a and 744b.

  In the micro heat exchanger 20 of the embodiment, nothing is provided between the adjacent tubes 30. However, as illustrated in the micro heat exchanger 820 of the modification of FIG. A reinforcing member 860 may be joined in parallel with the refrigerant supply / discharge flow paths 840a, 840b, 842a, 842b. In this way, the pressure resistance strength of the tube 830 can be further improved. In addition, it is preferable that the reinforcement member 860 is attached so that it may become parallel so that the flow of external air may not be prevented. Further, instead of the reinforcing member 860 of the tube 830, fins may be attached between the tubes.

  In the micro heat exchanger 20 of the embodiment, it is used for cooling the CPU 14 of the computer 10 as an example of use. It can also be used for cooling of heat generating equipment.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention can be used in the manufacturing industry of micro heat exchangers.

It is a block diagram which shows the outline of a structure of the micro heat exchanger 20 as one Example of this invention. 2 is a cross-sectional view showing an example of an AA cross section of the micro heat exchange 20. FIG. 3 is a cross-sectional view showing an example of a cross section at the center of a tube 30 constituting the micro heat exchanger 20. FIG. It is process drawing which shows an example of the manufacturing process of the micro heat exchanger 20 of an Example. It is an external view which shows the external appearance of the perforated member 30a. It is an external view which shows the external appearance of the pipe part formation member 30b. It is explanatory drawing explaining a mode that the partition walls 31a and 31b are formed. It is explanatory drawing explaining a mode that the bending member 30c is formed. It is an external view which shows the external appearance of the bending member 30c. It is an external view which shows the external appearance of the tube 30d before joining. It is a block diagram of the usage example which used the micro heat exchanger 20 of the Example for cooling of CPU14 with which the computer 10 is provided. It is sectional drawing which shows the structure of the micro heat exchanger 120 of a modification. It is sectional drawing which shows the structure of the micro heat exchanger 220 of a modification. It is explanatory drawing which shows a part of structure of the tube 330 of a modification. It is explanatory drawing which shows a part of structure of the tube 430 of a modification. It is a block diagram which shows the structure of the tube 530 of a modification. It is sectional drawing which shows the cross section of the tube 530 of a modification. It is sectional drawing which shows the cross section of the tube 630 of a modification. It is sectional drawing which shows the cross section of the tube 730 of a modification. It is an external view which shows an example of the external appearance of the inner fin 750. FIG. It is the side view which looked at the micro heat exchanger 820 of the modification from the side.

Explanation of symbols

10 Computer, 14 CPU, 15 Water jacket, 16 Blower, 18 Connecting pipe, 20, 120, 220, 820 Micro heat exchanger, 30, 130, 230, 330, 430, 530, 630, 730, 830 Tube, 30a Hole Opening member, 30b tube portion forming member, 30c bending member, 30d tube before joining, 31a, 31b partition wall, 32 first tube portion, 34 second tube portion, 36, 336, 436 end portion, 40a, 40b, 42a, 42b, 840b, 842b Refrigerant supply / discharge flow path, 44a, 44b, 544a1, 544a2, 544b1, 544b2, 644a1, 644a2, 644b1, 644b2, 744a, 744b heat exchange flow path, 132 through-hole, 134, 232, 234 tube section , 135, 233, 235 flange, 545a, 54 5b, 645a, 645b Partition, 750 inner fin, 860 reinforcing member.

Claims (11)

Micro heat exchange that cools the refrigerant flowing through a plurality of heat exchange tubes arranged in parallel at predetermined intervals by heat exchange with the outside air, formed as a flat hollow tube having a thickness of 0.5 mm or less with a metal material. A vessel,
The heat exchange tube is formed as the hollow tube by bending a single plate having a thickness of 0.1 mm or less, and drilling and burring are performed on both flat surfaces near both ends of the hollow tube. A pipe portion is formed as a flow passage forming portion for forming a flow passage for supplying and discharging the refrigerant, and both ends of the hollow tube are sealed by crushing and / or bending,
It is configured by joining pipe portions formed as flow path forming portions of adjacent heat exchange tubes in a state where a plurality of the heat exchange tubes are arranged ,
A micro heat exchanger characterized by that. The micro heat exchanger according to claim 1,
The flow path forming portion includes a first pipe portion formed as a first diameter tube having a length adjusted to the length of the predetermined interval on one of the two flat surfaces, and the other of the two flat surfaces. A second tube portion formed as a tube having a second diameter with the inner diameter of the first tube portion being substantially the outer diameter at a position aligned with the first tube portion;
Joined in a state where the second tube portion of the heat exchange tube is inserted into the first tube portion of the adjacent heat exchange tube,
A micro heat exchanger characterized by that.   The micro heat exchanger according to claim 2, wherein the end face of the first pipe portion of the heat exchange tube is joined at a position where it abuts against a flat surface of an adjacent heat exchange tube. The micro heat exchanger according to claim 1,
The flow path forming portion includes a first tube portion formed as a tube having a predetermined diameter and having a length shorter than the predetermined interval on one of the two flat surfaces, and the other of the two flat surfaces. A second pipe part that is adjusted as a length obtained by subtracting the length of the first pipe part from the length of the predetermined interval at a position aligned with the pipe part, and is formed as a pipe having a predetermined diameter;
The first tube portion of the heat exchange tube and the second tube portion of the adjacent heat exchange tube are joined,
A micro heat exchanger characterized by that. The micro heat exchanger according to claim 4 , wherein a flange is formed at a joining end portion of the first tube portion and the second tube portion. The micro heat exchanger according to any one of claims 1 to 5, wherein the heat exchange tube is formed as a plurality of hollow tubes coupled at least in the flow path forming portion. The heat exchange tube is formed in a substantially B-shaped cross section so as to form two hollow tubes at a portion including the flow path forming portion, and the refrigerant is supplied to and discharged from the two hollow tubes, respectively. The micro heat exchanger according to any one of claims 1 to 6, wherein the flow path forming portion is formed. The micro heat exchanger according to any one of claims 1 to 7, wherein the heat exchange tube is a tube having inner fins joined to both inner flat surfaces. The micro heat exchanger according to any one of claims 1 to 8, wherein the heat exchange tube is formed by bending the flow path forming portion after processing the flow path forming portion into a plate material having a thickness of 0.1 mm or less. Micro heat exchange that cools the refrigerant flowing through a plurality of heat exchange tubes arranged in parallel at predetermined intervals by heat exchange with the outside air, formed as a flat hollow tube having a thickness of 0.5 mm or less with a metal material. A method of manufacturing a vessel,
Drilling a tube portion as a flow path forming portion for forming a flow path for supplying and discharging refrigerant on both flat surfaces near both ends of the heat exchange tube in a single plate material having a thickness of 0.1 mm or less The tube for heat exchange is formed by burring, and then formed into a flat hollow tube by bending, and further, both ends of the flat hollow tube are sealed by crushing and / or bending. Forming a tube; and
A joining step of joining pipe portions formed as flow path forming portions of adjacent heat exchange tubes in a state where a plurality of the heat exchange tubes are arranged ;
Manufacturing method of micro heat exchanger which manufactures micro heat exchanger using The method for manufacturing a micro heat exchanger according to claim 10 , wherein the joining step is a step of welding by brazing.

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