JP2017205787A - Brazing method by high-frequency induction heating, non-brazed portion protection member and non-brazed portion protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress temperature rise of a portion other than a junction (non-brazed portion) without blocking heating of the junction, when brazing by using high-frequency induction heating.SOLUTION: In a brazing method by high-frequency induction heating in an embodiment, a junction (for example, a projection part 31(#1) and a tip part 21(#1)) is subjected to high-frequency induction heating in the state where the periphery of a non-brazed portion which is a portion other than the junction to be brazed (for example, SUS piping 6(#1)) is covered with a protection member 10 having heat shield function.SELECTED DRAWING: Figure 2

Description

  Embodiments described herein relate generally to a brazing method using high-frequency induction heating, a non-brazed portion protection member, and a non-brazed portion protection apparatus.

  Conventionally, brazing using a flame torch has been applied to join the stators of a generator.

  However, in recent years, high-frequency induction heating (hereinafter referred to as “IB (Induction Brazing) method”) is used instead of brazing joining using a flame torch to prevent the occurrence of a fire or the burning of an insulating material. Joining by brazing has also been applied.

  An example in which brazing using the IB method is applied will be described with reference to FIG.

  FIG. 8 is a conceptual diagram showing an example in which a high-frequency induction heating coil is disposed in the vicinity of the joint in order to join the joint of the electric coil of the water-cooled generator by brazing using the IB method.

  In FIG. 8, the strand conductor 1 (# 1) constituting the electric coil of the water-cooled generator is bundled by a clip 2 (# 1). Similarly, the strand conductor 1 (# 2) is bundled by the clip 2 (# 2).

  The clip 2 (# 1) and the clip 2 (# 2) are electrically connected to each other by a sleeve joint 4 provided with a copper member called a solid connection (solid connection) 3 (# 1, # 2) at both ends. And mechanical connections are made.

  For this connection, clip 2 (# 1) and solicon 3 (# 1), and clip 2 (# 2) and solicon 3 (# 2) are joined by brazing using the IB method.

  FIG. 9 is a diagram for illustrating a cross-sectional configuration for explaining the joining of the clip 2 (# 1) and the solid con 3 (# 1).

  As shown in FIG. 9, the protruding portion 31 (# 1) of the silicon 3 (# 1) is inserted into the tip portion 21 (# 1) of the clip 2 (# 1). Both the protruding portion 31 (# 1) and the tip portion 21 (# 1) are made of a copper material. Then, the copper materials of the protruding portion 31 (# 1) and the tip portion 21 (# 1) are joined by brazing using the IB method (that is, the protruding portion 31 (# 1) and the tip portion 21 (# 1)). The high-frequency induction heating coil 5 that operates by being powered by the handheld transformer 9 has a distance from the tip portion 21 (# 1) as shown in FIG. It arrange | positions close to the circumference | surroundings of the front-end | tip part 21 (# 1) so that it may become ten or less mm.

  Then, the high frequency heating by the high frequency induction heating coil 5 heats both the joint, that is, the tip portion 21 (# 1) and the protruding portion 31 (# 1) inserted therein. In general, for such copper-to-copper bonding, an output of 50 to 100 kW with a high frequency of about 15 kHz is used, and the joint portion (that is, the protruding portion 31 (# 1) and the tip portion 21 (# 1)) After being heated to around 700 to 800 ° C., generally, a phosphorous copper solder is poured into the gap between the protruding portion 31 (# 1) and the tip portion 21 (# 1). Joining by brazing is completed.

JMAG Application Catalog 83-Magnetic shielding analysis of induction furnace, https://www.imag-international.com/catalog/83_InductionFurnace_MagneticShielding.html (searched on March 16, 2016) Heated steam generator and new technology for induction heating, Fuji Time Report Vol. 83, no. 2 2010, 138 (34) -144 (40)

  However, when the tip portion 21 of the clip 2 as shown in FIG. 8 and the protruding portion 31 of the solicon 3 are joined by brazing using the IB method, there are the following problems.

  That is, as described above, in the IB method, in order to heat the joint, the high frequency induction heating coil 5 needs to be brought closer to the tens of mm or less with respect to the joint. However, the high frequency radiated | emitted from the high frequency induction heating coil 5 reaches | attains not only a junction part but site | parts other than a junction part. For this reason, parts other than a junction part are also heated.

  By the way, as shown in FIG. 8, the SUS pipe 6 (# 1, # 2) is joined to the solicon 3 (# 1, # 2) by vacuum brazing using high temperature brazing such as nickel brazing. ing. The SUS pipe 6 (# 1, # 2) is connected to an insulating connection pipe (not shown) that forms a water passage for passing pure water supplied to the water-cooled generator.

  As shown in FIG. 8, the high-frequency induction heating coil 5 extending from the handheld transformer 9 reaches the vicinity of the joint portion (that is, the protruding portion 31 (# 1) and the tip portion 21 (# 1)). It is also arranged in the vicinity of the SUS pipe 6 (# 1). Of course, the high frequency radiated from the surrounding high frequency induction heating coil 5 is anyway, although it is not as close as the joint portion (that is, the protruding portion 31 (# 1) and the tip portion 21 (# 1)). Since the SUS pipe 6 (# 1) is also reached, the SUS pipe 6 (# 1) is also heated.

  As described above, the joint portion (that is, the protruding portion 31 (# 1) and the tip portion 21 (# 1)) that is a copper member is heated to around 700 to 800 ° C. However, the solidus temperature of nickel brazing is 970 ° C., and the liquidus temperature is 1000 ° C. Therefore, when a high frequency is radiated from the high frequency induction heating coil 5, not only the joint (that is, the protruding portion 31 (# 1) and the tip portion 21 (# 1)) but also the SUS pipe 6 (# 1) is heated. Then, there is a possibility that the nickel brazing used for joining the silicon 3 (# 1) and the SUS pipe 6 (# 1) is melted.

  In addition, the melting point of SUS is 1400 ° C., and the SUS pipe 6 (# 1) itself may be thinned or deformed by melting, and in some cases, a hole may be opened.

  The same may occur for the SUS pipe 6 (# 2) when the protruding portion 31 (# 2) and the tip portion 21 (# 2) are joined.

  Thus, when joining the front-end | tip part 21 of the clip 2, and the projection part 31 of the solid con 3 by brazing using IB method, parts other than a junction part like the SUS piping 6 will also be heated, for example. There is a problem that it may cause adverse effects.

  The present invention has been made in view of such circumstances, and when joining using the IB method, without inhibiting the heating of the joined portion (hereinafter referred to as "non-brazed portion") 2), the joined portions can be joined without adversely affecting the non-brazed portions.

  The problem to be solved by the present invention is that when brazing using high-frequency induction heating, the temperature rise of the non-brazed portion can be suppressed without hindering the heating of the joint portion. It is to provide a member and non-brazing protection device.

  The brazing method by high-frequency induction heating according to the embodiment includes a high-frequency induction heating of the joint portion in a state where the periphery of the non-brazing portion, which is a portion other than the joint portion to be brazed, is covered with a protective member having a heat shield function. To do.

It is a perspective conceptual diagram which shows the structural example of the non-brazing part protection member of 1st Embodiment. It is a conceptual diagram for demonstrating the state where the circumference | surroundings of a non-brazing part are covered with the non-brazing part protection member. (A) Longitudinal sectional view for explaining the positional relationship between the non-brazed portion and the non-brazed portion protecting member insulating material when the periphery of the non-brazed portion is covered by the non-brazed portion protecting member (B) It is the front view seen from the front end surface. It is a conceptual diagram which shows the structural example of the non-brazing part protection member of 2nd Embodiment. It is a perspective conceptual diagram which shows the structural example of the non-brazing part protection apparatus of 3rd Embodiment. It is the cut surface view and side view of the protection part formed of the thin tube which is a tube. It is the cutaway view and side view of the protection part which were formed of the thin tube which is a square tube. It is a conceptual diagram which shows the example by which the high frequency induction heating coil was arrange | positioned in the vicinity of a junction part, in order to join the junction part of the armature winding of a water cooling generator by brazing using IB method. It is a figure for demonstrating the cross-sectional structure for demonstrating joining of a clip and a solicon.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the code | symbol in the figure used for description of each following embodiment attaches | subjects and shows the same code | symbol about the same part as FIG. 8 and FIG.

(First embodiment)
FIG. 1 is a perspective conceptual view showing a configuration example of the non-brazed portion protection member of the first embodiment. That is, the non-brazed portion protecting member 10 of the present embodiment includes an outer cylinder 12 formed of a copper member having a thickness of about 2 to 4 mm, and a ceramic tape (eg, Hontes Industrial Co., Ltd.) disposed inside the outer cylinder 12. It is formed in a substantially circular tube shape composed of an insulating material 14 such as a ceramic tape (silica woven product). And when brazing is performed with respect to a joint part by IB method, it is used by arrange | positioning around the non-brazing part which is parts other than a joint part. In all embodiments, “brazing” is to be interpreted as including “soldering”.

  For example, brazing and joining are performed by the IB method on the joints (projection portion 31 (# 1) and tip portion 21 (# 1)) of the armature winding of the water-cooled generator as shown in FIG. In this case, as shown by an arrow C in FIG. 2, the periphery of the SUS pipe 6 (# 1), which is a non-brazing portion where the high-frequency induction heating coil 5 is disposed in the vicinity, is covered with a non-brazing portion protection member 10. Like that.

  FIG. 3 illustrates the positional relationship between the SUS pipe 6 (# 1) and the non-brazed portion protecting member 10 when the periphery of the SUS pipe 6 (# 1) is covered with the non-brazed portion protecting member 10. (A) longitudinal direction sectional drawing, (b) The front view seen from the front end surface.

  When the periphery of the SUS pipe 6 (# 1) is covered with the non-brazed portion protection member 10, first, the insulating material 14 is wound around the SUS pipe 6 (# 1), and further on the outer periphery of the insulating material 14 The outer cylinder 12 is covered. For this reason, the inner diameter of the outer cylinder 12 is made 4 to 5 mm larger than the outer diameter of the SUS pipe 6 (# 1).

  The insulating material 14 has two roles. One is to reduce the amount of heat transfer between the outer cylinder 12 and the SUS pipe 6 (# 1). The other is to keep the separation distance between the outer cylinder 12 and the SUS pipe 6 (# 1) constant.

  Such a non-brazed portion protection member 10 not only suppresses the temperature rise due to induction heating of the SUS pipe 6 (# 1), but also uniformly transmits heat due to induction heating to the SUS pipe 6 (# 1). The local temperature rise of the SUS pipe 6 (# 1) is also prevented.

  In order to further suppress the temperature rise due to induction heating of the SUS pipe 6 (# 1), the insulating material 14 may contain water. As a result, the latent heat of vaporization of water can be used, and the amount of heat transfer from the outer cylinder 12 to the SUS pipe 6 (# 1) can be further reduced.

  Thus, the non-brazed portion protection member 10 of the present embodiment has a heat shield function that reduces the amount of heat generated by induction heating to the non-brazed portion such as the SUS pipe 6 (# 1). Have.

  Next, the flow of the brazing method by the IB method, which is performed by applying the non-brazing portion protecting member 10 of the present embodiment configured as described above, will be described.

  For example, FIG. 2 shows a case in which the protruding portion 31 (# 1) of the solid silicon 3 (# 1) and the tip portion 21 (# 1) of the clip 2 (# 1) are brazed and joined by brazing by the IB method. As described above, the high-frequency induction heating coil 5 is disposed in the vicinity of the tip portion 21 (# 1).

  As a result, the high frequency induction heating coil 5 inevitably comes close to the vicinity of the SUS pipe 6 (# 1) connected to the solid condenser 3 (# 1).

  Therefore, in order to reduce the influence of induction heating of the SUS pipe 6 (# 1) by the high-frequency induction heating coil 5, the periphery of the SUS pipe 6 (# 1) is covered with the non-brazed portion protection member 10.

  When the periphery of the SUS pipe 6 (# 1) is covered with the non-brazed portion protection member 10, first, the insulating material 14 is wound around the SUS pipe 6 (# 1). Further, the outer cylinder 12 of the non-brazed portion protection member 10 is put on the outer periphery of the insulating material 14.

  When high frequency is radiated from the high frequency induction heating coil 5 in a state where the periphery of the SUS pipe 6 (# 1) is covered with the non-brazed portion protection member 10, the protruding portion 31 (# 1) which is a joint portion and The tip portion 21 (# 1) is heated to a necessary temperature, while the SUS pipe 6 (# 1) which is a non-brazing portion is covered with the non-brazing portion protection member 10 to induce an induced current. Decreases and temperature rise is suppressed.

  For example, the penetration depth into a high-frequency copper tube around 15 kHz is about 1 mm at 700 to 800 ° C. Therefore, if the outer cylinder 12 is made of copper having a thickness of several millimeters, the SUS pipe 6 (# 1) does not melt.

  Further, since copper has a higher thermal conductivity and a lower relative magnetic permeability than SUS, the temperature rises uniformly during heating by high frequency induction and is not heated locally. Therefore, the outer cylinder 12 itself is not melted by heating by high frequency induction.

  Further, in the non-brazed portion protection member 10, the presence of the insulating material 14 keeps the distance between the outer cylinder 12 and the SUS pipe 6 (# 1) substantially constant along the circumferential direction. The heat is transmitted almost uniformly to the surface of the SUS pipe 6 (# 1). For this reason, local heating on the surface of the SUS pipe 6 (# 1) is also avoided.

  Furthermore, when the insulating material 14 contains water, the amount of heat transfer from the outer cylinder 12 to the SUS pipe 6 (# 1) is also reduced by the latent heat of vaporization of the water, so the SUS pipe 6 (# 1 ) Is further reduced.

  As described above, the non-brazed portion protection member 10 of the present embodiment can reduce the amount of heat generated by induction heating to the non-brazed portion.

  Copper is suitable as the material of the outer cylinder 12 of the non-brazed portion protection member 10 of the present embodiment. Copper has a high thermal conductivity, and the copper tube does not melt locally when the temperature rises uniformly. Therefore, the outer cylinder 12 can be reused many times for many brazing joining operations.

  For example, after the end portion 21 (# 1) and the protruding portion 31 (# 1) are joined by brazing, the outer cylinder 12 is extracted from the SUS pipe 6 (# 1) and the insulating material 14 is attached to the SUS pipe. Remove from 6 (# 1).

  For example, when the extracted outer cylinder 12 is joined to the tip portion 21 (# 2) of the clip 2 (# 2) and the protruding portion 31 (# 2) of the solicon 3 (# 2), That is, it is reused to cover the SUS pipe 6 (# 2).

  On the other hand, the removed insulating material 14 may be reused as long as the thermal insulation function is sound, but may be disposable each time.

  According to the brazing method by high-frequency induction heating of the present embodiment, which is performed by applying such a non-brazing portion protection member 10, the bonding portion is not hindered from heating, and good brazing joining is performed. On the other hand, it is possible to suppress the temperature rise for the non-brazed portion.

(Second Embodiment)
The present embodiment is a modification of the non-brazed portion protection member of the first embodiment. This non-brazing portion protection member is also suitably applied to the brazing method by the IB method described in the first embodiment.

  Therefore, in the following description, only differences from the first embodiment will be described, and the other description will be omitted because it is the same as the first embodiment.

  FIG. 4 is a conceptual diagram illustrating a configuration example of the non-brazed portion protection member 20 according to the second embodiment. This is a front view as seen from the front end surface as shown in FIG.

  The non-brazed portion protection member 20 of the present embodiment has a double tube structure, and the outer cylinder 23, the inner cylinder 22, and the intervals between the outer cylinder 23 and the inner cylinder 22 are substantially along the circumferential direction. It consists of a spacer 24 for keeping constant and an insulating material 14 arranged inside the inner cylinder 22. The insulating material 14 is used to be wound around a non-brazed portion such as the SUS pipe 6 in the same manner as described in the first embodiment. For example, a ceramic tape (eg, ceramic tape manufactured by Hontes Kogyo Co., Ltd. Silica) Nonwoven products) are preferred.

  That is, the non-brazed portion protection member 20 of the present embodiment includes an outer tube 23 and an inner tube in which the outer cylinder 12 of the non-brazed portion protection member 10 of the first embodiment is held at a constant interval by the spacer 24. 22 is replaced with a double pipe consisting of 22.

  Both the outer cylinder 23 and the inner cylinder 22 are preferably made of a copper member having a thickness of about 2 to 4 mm. Several spacers 24 are provided along the circumferential direction, and preferably a rod-shaped ceramic extending in the longitudinal direction (the depth direction in the figure) is used. The outer cylinder 23 and the inner cylinder 22 may be fixed by the spacer 24.

  Further, instead of the spacer 24, a ceramic tape (eg, ceramic tape manufactured by Hontes Kogyo Co., Ltd.) is wound on the outside of the inner cylinder 22 and inserted into the outer cylinder 23 in the same manner as the insulating material 14. A double pipe may be configured.

  By applying the non-brazed portion protection member 20 of this embodiment having such a double tube structure, the protruding portion 31 (# 1) and the tip portion 21 (# 1) of the clip 2 (# 1) are connected. When brazing and joining by brazing by the IB method, the insulating material 14 is wound around the SUS pipe 6 (# 1) which is a non-brazing portion. Further, a double pipe comprising an inner cylinder 22 and an outer cylinder 23 provided outside the outer cylinder 23 is put on the outer periphery of the insulating material 14.

  When high frequency is radiated from the high frequency induction heating coil 5 in a state where the periphery of the SUS pipe 6 (# 1) is covered with the non-brazed portion protection member 20, the protruding portion 31 (# 1) which is a joint portion and The tip portion 21 (# 1) is heated to a required temperature, while the SUS pipe 6 (# 1) which is a non-brazed portion is formed by the double pipe structure of the non-brazed portion protection member 20 in the first embodiment. The temperature rise is further suppressed as compared with the case where the non-brazed portion protection member 10 is applied.

  This is because in the non-brazed portion protection member 20, when a high frequency is radiated from the high frequency induction heating coil 5, first, the temperature of the outer cylinder 23 rises. Since the outer cylinder 23 has a higher thermal conductivity than SUS, the temperature of the outer cylinder 23 can be made uniform, so that the temperature of the outer cylinder 23 does not increase locally, and heat is evenly distributed throughout the outer cylinder 23. Distributed.

  In this state, the heat of the outer cylinder 23 is transmitted to the inner cylinder 22. When a ceramic tape similar to the insulating material 14 is wound between the outer cylinder 23 and the inner cylinder 22, the heat transferred from the outer cylinder 23 to the inner cylinder 22 due to the insulating effect of the insulating material 14 is further increased. Reduced.

  Since the inner cylinder 22 also has a higher thermal conductivity than SUS, similarly, the inner cylinder 22 does not increase in temperature locally, and the heat is further evenly distributed throughout the inner cylinder 22. .

  In this state, the heat of the inner cylinder 22 is transmitted to the SUS pipe 6 (# 1). Since the insulating material 14 is wound between the inner cylinder 22 and the SUS pipe 6 (# 1), it is transmitted from the inner cylinder 22 to the SUS pipe 6 (# 1) by the insulating effect of the insulating material 14. Heat is further reduced.

  Thus, if the high frequency induction heating coil 5 emits a high frequency in a state where the periphery of the SUS pipe 6 (# 1) is covered by the non-brazed portion protection member 20 of the present embodiment, the protruding portion 31 which is a joint portion. While (# 1) and the tip portion 21 (# 1) are heated to the required temperature, the temperature rise of the SUS pipe 6 (# 1) which is a non-brazing portion is a double pipe of the non-brazing portion protection member 20 According to the structure, the non-brazed portion protection member 10 of the first embodiment is further suppressed as compared with the case where the non-brazed portion protection member 10 is applied.

(Third embodiment)
FIG. 5 is a perspective conceptual diagram illustrating a configuration example of the non-brazed portion protecting apparatus according to the third embodiment. That is, the non-brazing part protection device 40 of this embodiment is applied instead of the non-brazing part protection member of the first and second embodiments.

  Such a non-brazed portion protection device 40 of this embodiment is a protection in which the narrow tube 42 is tightly wound in a coil shape (preferably wound so that no gap is formed between adjacent thin tubes 42). A portion 41 is provided. The material of the thin tube 42 is preferably copper for the same reason as in the first and second embodiments. The thin tube 42 is formed of a tube having a circular cross section or a square tube having a rectangular cross section.

  FIG. 6A and FIG. 7A are views for explaining the cross-sectional shape of the narrow tube 42 forming the protection part 41. FIG. 6B and FIG. 7B are side views of the protection unit 41 shown in FIG. 5 as viewed from the right side in FIG. FIGS. 6A and 7A are front views showing cut surfaces along the line A-A ′ in FIGS. 6B and 7B, respectively.

  That is, when a tube is used for the thin tube 42, the cross-sectional shape is circular as shown in FIG. 6 (a), and when a square tube is used for the thin tube 42, the cross-sectional shape is as shown in FIG. 7 (a). As shown, it has a rectangular shape. 5 shows an example in which a tube is used as the thin tube 42, and the cross-sectional shape of the thin tube 42 at the inlet 48 and the outlet 50 is a circular tube.

  If it is the thin tube 42 which is a tube like Fig.6 (a), in the protection part 41, the adjacent thin tubes 42 are in line contact. On the other hand, as shown in FIG. 7A, in the case of the narrow tube 42 ′ that is a square tube, adjacent thin tubes 42 ′ are in surface contact with each other in the protection unit 41.

  Further, the narrow tube 42 forming the protection part 41 includes an inlet 48 through which the coolant D is injected and an outlet 50 through which the coolant D is discharged.

  Further, a pump 44 and a cooler 46 are provided in the middle of a narrow tube (not shown in FIG. 5) connecting the inlet 48 and the outlet 50.

  The pump 44 supplies the coolant D, preferably water, from the injection port 48 into the narrow tube 42 (or 42 ') forming the protection part 41, and the coolant D discharged from the discharge port 50, The coolant D is circulated in the narrow tube 42 (or 42 ′) that forms the protection part 41 by supplying again from the injection port 48 into the narrow tube 42 (or 42 ′).

  The cooler 46 is, for example, a simple air-cooled chiller, a water tank, a radiator, or the like. In FIG. 5, an example provided between the discharge port 50 and the pump 44 is illustrated as an example. The cooler 46 forcibly cools the cooling water D discharged from the discharge port 50. Therefore, the pump 44 supplies the cooling water D cooled by the cooler 46 to the narrow tube 42 (or 42 ′) that forms the protection unit 41. The cooler 46 is not limited to be provided between the discharge port 50 and the pump 44, and may be provided between the pump 44 and the injection port 48.

  Next, an operation example by the non-brazing portion protection apparatus 40 of the present embodiment configured as described above will be described.

  That is, the non-brazing portion protection device 40 of the present embodiment is applied instead of the non-brazing portion protection member 10 when brazing by induction heating by the high frequency induction heating coil 5 is performed. For that purpose, first, as shown by the arrow C in FIG. 5 which shows the same direction as the arrow C in FIG. 2, the protection part 41 is moved in the direction of the arrow C, so that the SUS pipe 6 (# 1) It arrange | positions so that the circumference | surroundings of such a non-brazing part may be covered. At this time, the inlet 48 and the outlet 50 are located at a position farther from the high-frequency induction heating coil 5 than at least the protection part 41. Then, the pump 44 is activated to supply the coolant D into the narrow tube 42 (or 42 ').

  For example, a non-brazed portion such as the SUS pipe 6 (# 1) is induction-heated by the high-frequency induction heating coil 5 even if the periphery is covered by the protection portion 41. However, the non-brazed portion is cooled by the coolant D that flows in the narrow tube 42 that forms the protective portion 41.

  As a result, the temperature of the coolant D rises while it flows through the protection part 41, but is forcibly cooled by the cooler 46 after being discharged from the discharge port 50.

  The coolant D thus cooled is again fed from the inlet 48 into the narrow tube 42 (or 42 ') by the pump 44. Thereby, the non-brazed portion is continuously cooled.

  According to the non-brazed portion protection apparatus 40 of the present embodiment, as described above, the coolant is continuously provided in the narrow tube 42 (or 42 ′) forming the protective portion 41 disposed around the non-brazed portion. It is possible to suppress the temperature increase of the non-brazed portion without hindering the heating of the joint portion by the high frequency induction heating performed by the high frequency induction heating coil 5.

  Such forced cooling can cool the non-brazed portion more reliably than in the first and second embodiments.

  As described above, as shown in FIG. 7A, the narrow tubes 42 ′ that are square tubes are in surface contact with each other in the protective portion 41. As shown in FIG. 6A, such a configuration can provide a higher high frequency shielding effect than the narrow tube 42 that is a tube in which adjacent thin tubes 42 are in line contact with each other.

  According to at least one embodiment described above, when brazing using high-frequency induction heating, a temperature increase in a portion other than the joint (non-brazed portion) is suppressed without inhibiting the heating of the joint. be able to.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  For example, in the first embodiment, the outer cylinder 12 of the non-brazed portion protection member 10 is used. In the second embodiment, the outer cylinder 23 and the inner cylinder 22 of the non-brazed portion protection member 20 are used. In the embodiment, an example in which copper having a higher thermal conductivity and lower relative permeability than the SUS pipe 6 constituting the non-brazed portion is used as the thin tube 42 has been described. However, since aluminum is also a substance having higher thermal conductivity and lower relative permeability than the SUS pipe 6 constituting the non-brazed portion, it is possible to apply aluminum instead of copper.

  Moreover, in said embodiment, the brazing method implemented by applying the non-brazing part protection member 10 or the non-brazing part protection apparatus 40 is made into the junction part of the armature winding of a water cooling generator. An example in the case of brazing was described. However, the brazing method of each embodiment is not limited to this example, and the IB method is used to selectively heat only the joint portion while suppressing the temperature rise of the non-brazing portion. It can be applied to any target that is required.

DESCRIPTION OF SYMBOLS 1 Wire conductor 2 Clip 3 Solid connection 4 Sleeve joint 5 High frequency induction heating coil 6 SUS piping 9 Handheld transformer 10 Non-brazing protection member 12 Outer cylinder 14 Insulation material 20 Non-brazed part protection member, 21 Tip part, 22 Inner cylinder, 23 Outer cylinder, 24 Spacer, 31 Projection part, 40 Non-brazed part protection device, 41 Protective part, 42 Narrow pipe, 44 Pump, 46 Cooler, 48 Inlet , 50 outlet.

Claims (8)

  A brazing method by high-frequency induction heating in which the joint is covered with a protective member having a heat shield function around the non-brazed portion, which is a part other than the joint to be brazed, with high-frequency induction heating.   The brazing method by high frequency induction heating according to claim 1, wherein the joining portion is a part of a stator of a generator, and the non-brazing portion is a pipe joined to the stator. A non-brazed portion protection member disposed around a non-brazed portion that is a portion other than a joint portion to be brazed when brazing by high frequency induction heating is performed,
A heat insulating material that covers the outer periphery of the non-brazed portion, and a material that covers the outer periphery of the heat insulating material and has a higher thermal conductivity than the non-brazed portion, or a material that has a lower relative permeability than the non-brazed portion. A non-brazed portion protection member that realizes the heat shield function by including an outer cylinder portion including   A first outer cylinder part that covers the outer periphery of the non-brazed part and has a material having a higher thermal conductivity than the non-brazed part, or a substance having a lower relative magnetic permeability than the non-brazed part; A second outer cylinder part that covers the outer periphery of the first outer cylinder part and contains a substance having a higher thermal conductivity than the non-brazing part or a substance having a lower relative permeability than the non-brazing part; The non-brazing part protection member according to claim 3, comprising:   The non-brazed part protection member according to claim 4, further comprising a heat insulating material between the first outer cylinder part and the second outer cylinder part.   The non-brazed portion protection member according to claim 3, wherein water is included in the heat insulating material.   When a thin tube through which coolant flows is tightly wound in a coil shape and brazing is performed by high-frequency induction heating, protection is placed around the non-brazed part, which is a part other than the joint part to be brazed. Non-brazed part protection device with a part. The narrow tube includes an inlet for injecting the coolant and an outlet for discharging the coolant,
A pump that supplies the coolant into the narrow tube by supplying the coolant from the injection port into the narrow tube and supplying the coolant discharged from the discharge port into the narrow tube through the injection port. When,
The non-brazed portion protection apparatus according to claim 7, further comprising cooling means for cooling the coolant discharged from the discharge port.