JPH0588770U - Brazing jig - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a brazing jig capable of efficiently assembling brazed members. [Arrangement] Between the upper pressure plate 3 and the heat exchanger 51, a ring-shaped spring receiver 11, a large-diameter coil spring 15 that presses the entire peripheral edge of the disk 53 via the spring receiver 11, and a disk shape. The spring receiver 13 and the small-diameter coil spring 19 that pressurizes the center of the disk 53 via the spring receiver 13 are provided.
Since the natural length of the coil spring 19 is longer than the natural length of the coil spring 15 by the depth of the recess 53a, it is not necessary to use a spacer and the efficiency of the assembling work can be improved. Since one coil spring 15 can uniformly press the entire peripheral portion of the disk 53, the number of coil springs can be reduced and the efficiency of the assembling work can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brazing jig for pressurizing and restraining a brazed member such as a brazing sheet when brazing the brazed member.

[0002]

[Prior Art]

 Conventionally, brazing is generally used for metal products such as heat exchangers, metal bellows, and brazed honeycombs that are difficult to manufacture by ordinary welding. The following brazing jigs are used for brazing this type of product. For example, a pair of upper and lower pressure plates that can be moved closer to and away from each other, a coil spring disposed between the upper pressure plate and the brazed member, and a lower pressure plate that is erected upright at the four corners and penetrates the upper pressure plate. It is a brazing jig with a bolt that is screwed onto the nut.

In the brazing jig thus configured, a brazing member is formed by laminating, for example, a brazing sheet on the lower pressure plate, and the coil panel and the upper pressure plate are sequentially placed on the brazed member. To do. Then, by tightening the nut to regulate the separation distance between the upper and lower pressure plates, the brazed member can be pressed and restrained. When the brazed member is heated while being pressed and restrained by a brazing jig, the brazing alloy of the brazing sheet is melted and the brazing sheet can be joined.

[0004]

[Problems to be solved by the device]

 In this type of brazing jig, the following parts need to be used when pressurizing and restraining a brazed member that is large and has an uneven surface, such as a type of honeycomb. It was

That is, if the brazing member is large, uniform pressing cannot be performed with only one coil spring. For this reason, it is necessary to arrange a number of coil springs having the same natural length and the same spring constant in parallel on the end surface of the brazed member, and to mount the upper pressure plate from above. Further, if the brazed member has irregularities, the coil spring must be arranged in the recessed part of the brazed member. On the other hand, each coil spring has the same natural length and spring constant as described above. Therefore, in order to make the resilience of the coil spring arranged in the recessed part equal to that of the coil spring arranged in the other part, a spacer corresponding to the depth of the recess is formed at the tip of the coil spring. Had to be installed.

In these cases, a large number of parts are required to press-fit the brazing member. Therefore, the work of assembling the brazed member to the brazing jig becomes complicated, which is a major obstacle to improving the efficiency of the whole brazing work. Then, this invention was made for the purpose of providing the brazing jig which can perform the assembling work of a brazed member efficiently.

[0007]

[Means for Solving the Problems]

 The invention (1st invention) of Claim 1 made in order to achieve the said object is a pair of pressurization plates which can mutually approach and separate, The said pressure plate of at least any one, The said pair of pressurization. By defining the separation distance between the elastic member arranged between the brazing member arranged between the plates and the pair of pressure plates, the brazing member can be separated by the elastic member. A brazing jig including: a restraining member for pressurizing and restraining, wherein the elastic member is a large-diameter coil spring that pressurizes at least the peripheral portion of the brazed member, and a small-diameter coil spring disposed inside the coil spring. The invention is based on a brazing jig, which is characterized in that it has a coil spring and a coil spring, and the invention according to claim 2 (hereinafter referred to as the second invention) is a pair of pressure plates which can be separated from each other. And at least one By defining the separation distance between the elastic member disposed between one of the pressure plates and the brazed member disposed between the pair of pressure plates, and the separation distance between the pair of pressure plates, A brazing jig comprising: a restraining member that pressurizes and restrains the brazed member via the elastic member, wherein the elastic member includes a plurality of members, and the pressure plate and the elastic members Each elastic member is added to the end surface of the brazed member by changing the elastic constant or natural length of each elastic member according to the distance from the end surface of the brazed member on which the member is disposed. The gist is a brazing jig, which is characterized in that the pressure is the same.

[0008]

[Action]

 In the first aspect of the invention configured as described above, the elastic member includes at least a large-diameter coil spring that pressurizes the peripheral portion of the brazed part and a small-diameter coil spring that is disposed inside the coil spring. Is configured.

Therefore, even when the brazing member is large, one large-diameter coil spring uniformly presses the entire periphery of the brazing member. In addition, when the brazed member is large, there may be a portion where the pressure is not sufficiently applied inside the large diameter coil spring. The small-diameter coil spring arranged inside the large-diameter coil spring pressurizes the brazed member in this portion.

On the other hand, in the second invention, the elastic member is composed of a plurality of members, and the elastic member of each elastic member is adjusted according to the distance between the pressure plate and the end surface of the brazed member on which the elastic member is disposed. Different elastic constants or natural lengths. As a result, the pressure applied by each elastic member to the end surface of the brazed member is the same.

By configuring the elastic member in this way, in the case where the brazed member has irregularities and the elastic member has to be arranged in a recessed portion of the end surface of the brazed member, etc. There is no need to use spacers, if any. That is, if each elastic member is arranged at a predetermined place and the separation distance between the pair of pressure plates is regulated, each elastic member applies the same pressure to the end surface of the brazed part.

[0012]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a plan view of the brazing jig 1 of the embodiment used in the brazing process of the heat exchanger 51, and FIG. 1 is a sectional view taken along the line AA. However, in FIG. 2, the upper pressure plate 3 described later is omitted.

First, as shown in FIG. 1, in the heat exchanger 51, a disc 53 made of a blazing sheet in which an annular recess 53 a is formed is alternately turned so that the recesses 53 a face each other. It is formed by stacking on top. An annular coolant channel 57 through which the coolant flows is formed inside the recesses 53a that are stacked facing each other. Further, aluminum alloy corrugated fins 59 are arranged in a gap formed inside the ring of the coolant channel 57 between the discs 53 in which the recesses 53a are placed back to back. Further, a corrugated fin 61 made of aluminum alloy is also disposed in the gap between the base 55 and the lowermost disc 53. A portion Z where the members 53 to 61 contact each other is a portion to be brazed by the process described later.

The brazing jig 1 is erected vertically from the square upper pressure plate 3 and the lower pressure plate 5 and the four corners of the lower pressure plate 5, and penetrates through the holes 3 a at the four corners of the upper pressure plate 3. It is provided with four bolts 7 and a nut 9 which is screwed onto the tip of the bolt 7 to determine the distance between the pressure plates 3 and 5. That is, the bolt 7 and the nut 9 correspond to the restraining member.

In addition to this, the brazing jig 1 is configured to include spring receivers 11 and 13 formed as follows, and coil springs 15 and 19 as elastic members. The spring receiver 11 is an annular flat plate along the flat portion on the back surface of the recess 53a. The spring receiver 13 is a disk having a diameter substantially equal to the inner diameter of the ring formed by the depression 53a. The coil vane 15 has a diameter approximately in the middle of the inner diameter and the outer diameter of the spring receiver 11, and the coil spring 19 has a diameter substantially equal to the outer diameter of the spring receiver 13. The ratio of the spring constants of the coil spring 15 and the coil spring 19 is not equal to the area ratio of the spring receiver 11 and the spring receiver 13, and the natural length of the coil spring 19 is smaller than the natural length of the coil spring 15 by the depth of the recess 53a. long.

In the brazing jig 1 configured as described above, when manufacturing the heat exchanger 51 described above, each member (the disk 53, the pedestal 55, the corrugated fins 59 and 61) that constitutes the heat exchanger 51 is It is assembled and used as follows. First, the members 53 to 61 forming the heat exchanger 51 are stacked and mounted on the lower pressure plate 5 in the order described above. Subsequently, the spring receiver 11 is placed on the flat portion of the back surface of the recess 53a of the disk 53 stacked on top. Further, the spring receiver 13 is placed on the flat portion in the center of the disc 53.

Further, after the coil spring 15 is placed on the spring receiver 11 and the coil spring 19 is placed on the spring receiver 13 concentrically, the upper pressure plate 3 is placed on the coil springs 15 and 19. At this time, the bolts 7 are inserted into the holes 3a of the upper pressure plate 3. Then, finally, the nuts 9 are screwed into the bolts 7 penetrating the holes 3a, respectively, and the nuts 9 are tightened until sufficient pressure is applied between the members 53 to 61 for brazing.

When the nut 9 is tightened, a uniform pressure is applied between the discs 53 as follows. That is, since the natural length of the coil spring 19 is longer than the natural length of the coil spring 15 by the depth of the depression 53a, the compression amounts of the coil springs 15 and 19 are equal to each other. Further, since the ratio of the spring constants of the coil spring 15 and the coil spring 19 is equal to the area ratio of the spring receiver 11 and the spring receiver 13, the pressure applied by the coil spring 15 to the disk 53 via the spring receiver 11 and the coil spring 19 are the springs. The pressure applied to the disk 53 via the receiver 13 becomes equal.

As described above, after the respective members 53 to 61 that constitute the heat exchanger 51 are assembled to the brazing jig 1 and pressure-restrained, the entire brazing jig 1 is heated. 61 brazes can be made. The pressure applied to each member 53 to 61 at this time can be easily adjusted by the tightness of the nut 9.

In addition, in the brazing jig 1 of the present embodiment, since the single coil spring 15 uniformly presses the entire peripheral portion of the disc 53, a large number of coil springs are arranged in the peripheral portion of the disc 37. Compared to the case, the number of required springs can be reduced and the assembling work of the members 53 to 61 can be improved efficiently. Further, since the large-diameter coil spring 15 can uniformly press the entire peripheral portion of the disc 53, it is possible to favorably prevent the pressure applied to the peripheral portion of the disc 37 from varying.

Furthermore, in the brazing jig 1 of the present embodiment, the natural length of the coil spring 19 is made longer than the natural length of the coil spring 15 by the depth of the recess 53a. Therefore, even though the disk 53 has irregularities and the coil spring 19 must be disposed in the recessed portion from the back surface of the recess 53a, the disk 53 is evenly formed on the disk 53 without using a spacer. Pressure can be applied. Therefore, the work of assembling the members 53 to 61 can be further improved. As a result, the work efficiency of the entire brazing operation of the members 53 to 61 can be dramatically improved.

Further, in the brazing jig 1 of the present embodiment, since the elastic force of the coil springs 15 and 19 is applied to the disk 53 via the spring receivers 11 and 13, the members 53 to 61 are more evenly distributed. It can be pressurized to one. For this reason, the heat exchanger 51 after brazing does not have inclination, variation in size, or defective brazing.

In the above embodiment, the upper pressure plate 3, the coil springs 15 and 19, and the spring receivers 11 and 13 are provided separately, but these members are integrally formed by welding in advance. You may stay. In this case, after stacking the members 53 to 61 on the lower pressure plate 5, the upper pressure plate 3 is placed so that the bolt 7 penetrates the hole 3a and the nut 9 is tightened. Good. Then, the members 53 to 61 can be assembled to the brazing jig 1 by such an extremely simple operation.

Next, a heat exchanger 51 was manufactured using the brazing jig 1 of the present example and the brazing jig 101 of the comparative example that has been conventionally used, and the following comparisons are performed. It was First, the brazing jig 101 was constructed as follows. As shown in the plan view of FIG. 3 and the sectional view taken along the line BB of FIG. 4, four square springs each having a side length substantially equal to the outer diameter of the coil spring 19 are used instead of the annular spring receiver 11. A receiver 111 is provided. Further, in place of the coil springs 15 and 19, five coil springs 119 having a natural length equal to that of the coil spring 15 and a radius equal to that of the coil spring 19 are provided. Further, a spacer 121 having the same thickness as the depth of the depression 53a is newly provided. Since the other parts are configured similarly to the brazing tool 1, the same reference numerals are given to the respective parts and detailed description of the structure is omitted.

In the brazing jig 101 configured as described above, after the members 53 to 61 that constitute the heat exchanger 51 are stacked and mounted on the lower pressure plate 5, each of the members 53 to 61 is placed on the flat portion on the back surface of the recess 53 a. The spring receivers 111 are placed every 90 °. A coil spring 119 is placed on each spring receiver 111. Further, a spring receiver 13 and a coil spring 119 are sequentially mounted on the center of the disc 53, and a spacer 121 is further mounted thereon. Then, the upper pressing plate 3 is placed on the coil spring 119 and the spacer 121 on the back surface of the recess 53a, and then the nut 9 is tightened to complete the assembly.

Table 1 shows a comparison of the assembling time and the like when the heat exchanger 51 is manufactured using the brazing jig 1 of the above-described example and the brazing jig 101 of the comparative example. In Table 1, the brazing jig 1 in which the upper pressure plate 3, the coil springs 15 and 19, and the spring receivers 11 and 13 are integrally provided is the embodiment A, and the brazing jig 1 in which the brazing jigs 1 are separately provided is the embodiment. B. In each example, the disc 53 and the pedestal 55 are made of a brazing sheet: BA12PC, and the corrugated fins 59 and 61 are made of an aluminum alloy: A3003, respectively, and a heat exchanger 51 having a diameter of 80 mm and a height of 100 mm is manufactured. did. Further, as a brazing condition in each example, a brazing method using a fluoride-based flux was adopted, and brazing was performed at 595 ° C. in a nitrogen gas atmosphere.

[0027]

[Table 1]

As can be seen from Table 1, since the brazing jigs 1 of Examples A and B have a small number of parts, the assembling time can be shortened satisfactorily, thus improving the efficiency of the whole brazing operation. be able to. Particularly, in the embodiment A, since there is only one part and the positioning work of the coil panels 15 and 19 is unnecessary, the efficiency can be improved very favorably. Further, in Examples A and B, since the number of parts is small, it is possible to prevent the arrangement position of each part from being displaced during the assembling work. Further, since the coil spring 15 uniformly presses the entire peripheral portion of the disk 53, it is possible to favorably prevent the manufactured heat exchanger 51 from being defective in brazing or tilting. Further, when the heat exchanger 51 is manufactured by the brazing jig 1 of the embodiment A or B, the assembling work is extremely simplified as described above, so that the assembling work is automated to further improve the efficiency. You can also

In each of the above-described embodiments, the coil spring 19 having a small diameter is arranged inside the coil spring 15 having a large diameter that presses the peripheral edge of the disc 53, and the natural length of the coil spring 19 is smaller than the natural length of the coil spring 15. The length is also increased by the depth of the depression 53a. That is, the brazing jig 1 of each of the above-mentioned embodiments has both the structure of the first invention and the structure of the second invention, but even if the following structure is adopted, the efficiency can be improved to some extent.

For example, the coil springs 15 and 19 may have the same natural length, and the spacer 121 of the brazing jig 101 may be placed on the coil spring 19. In this case, the entire periphery of the disk 53 can be uniformly pressed by the single coil spring 15, so that the number of required coil springs can be reduced and the efficiency of the assembling work can be improved.

Further, the four spring bearings 111 of the brazing jig 101 are placed on the flat portion on the back surface of the recess 53 a, and the spring constant of the coil spring 19 is equal to that of the coil spring 19 and the depth of the recess 53 a is larger than that of the coil spring 19. You may arrange | position the coil spring of the natural length short only for each. In this case, since uniform pressure can be applied to each part of the disk 53 without using the spacer 121, the efficiency of the assembling work can be improved.

Further, in the latter configuration, the spring constant of the coil spring disposed on the spring receiver 111 is appropriately set instead of having the above-described natural length, and the elastic force when the nut 9 is tightened is set. May be made to match the elastic force of the coil spring 19 at that time, and the same action and effect can be obtained.

On the other hand, in each of the above embodiments, the members 53 to 61 as the members to be brazed are disposed between the pair of upper and lower pressure plates 3 and 5 to apply pressure in the vertical direction. It can also be applied to a brazing jig that presses the brazing material horizontally. Further, in each of the above embodiments, the elastic force of the coil springs 15 and 19 is applied to the disk 53 through the spring receivers 11 and 13 to press the members 53 to 61 more uniformly. The cages 11 and 13 may not be provided in particular, and the coil springs 15 and 19 may be directly brought into contact with the disc 53. Furthermore, the present invention can be applied to various metal products such as products in which the peripheral portion and the center of the circular plate 53 are reversed, and products other than circular products.

[0034]

As described above in detail, in the first invention, the coil spring having a large diameter is arranged on the surface of the brazed member, and only the distance between the pair of pressure plates is regulated. The whole can be pressed uniformly. That is, it is only necessary to dispose one coil spring to pressurize the entire periphery of the brazed member. Therefore, the number of springs that must be arranged on the surface of the brazed member can be reduced, and therefore, even when the brazed member is large, it can be easily assembled to the brazing jig.

Further, in the second invention, when the plurality of elastic members are arranged at predetermined positions on the surface of the brazed member and the separation distance between the pair of pressure plates is regulated, the brazed member has unevenness. However, the same pressure can be applied to the end surface of the brazed member. For this reason, even if it is necessary to dispose the elastic member even in the recess of the end surface of the brazed member, the brazed member can be easily attached to the brazing jig without using a spacer. Can be assembled.

Therefore, by using the brazing jig of the first or second invention, it is possible to reduce the number of parts required to press and restrain the brazing member. Therefore, the work of assembling the brazed members can be efficiently performed, and the work efficiency of the whole brazing work can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a brazing jig of an example.

FIG. 2 is a plan view showing a brazing jig of an example.

FIG. 3 is a plan view showing a brazing jig of a comparative example.

FIG. 4 is a sectional view showing a brazing jig of a comparative example.

[Explanation of symbols]

1 ... Brazing jig 3 ... Upper pressure plate 5 ... Lower pressure plate 7 ... Bolt 9 ... Nut 11 ... Spring receiver 13 ... Spring receiver 15 ... Coil spring 19 ... Coil spring 51 ... Heat exchanger

Claims (2)

[Scope of utility model registration request] 1. A resilient member disposed between a pair of pressure plates that can approach and separate from each other, at least one of the pressure plates, and a brazing member disposed between the pair of pressure plates. A brazing jig comprising: a member; and a restraint member for restraining the brazed member under pressure via the resilient member by defining a separation distance between the pair of pressure plates, wherein the resilient member is a resilient member. However, a brazing jig having a large-diameter coil spring that pressurizes at least the peripheral portion of the brazed member and a small-diameter coil spring disposed inside the coil spring. 2. A resilient member disposed between a pair of pressure plates that can be brought close to and away from each other, at least one of the pressure plates, and a brazing member disposed between the pair of pressure plates. A brazing jig comprising: a member; and a restraint member for restraining the brazed member under pressure via the resilient member by defining a separation distance between the pair of pressure plates, wherein the resilient member is a resilient member. Is composed of a plurality of members, and the elastic constant or natural length of each elastic member is varied according to the distance between the pressure plate and the end surface of the brazed member on which each elastic member is disposed. Thus, the brazing jig is characterized in that the respective elastic members apply the same pressure to the end surface of the brazed member.