JP2526283B2 - Hanger for brazing in heat exchanger furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hanger for a heat exchanger for brazing in a furnace using a brazing sheet.

[Prior art]

Brazing of an aluminum heat exchanger using a brazing sheet is generally performed in a vacuum furnace.
For that purpose, first, each part of the heat exchanger is assembled, and after cleaning it, a supporting frame that can be divided into two as shown in FIG.
The core 22 is supported by 16 so as to sandwich it. The support frame 16 was locked to the horizontal member 17 of the furnace insertion / removal frame 14 as shown in FIGS. At this time, the plane of the core 22 was positioned parallel to the longitudinal direction of the frame 14 for inserting / removing the furnace. In the furnace, so-called face heating is performed in which the heater is heated so as to face the flat surface of the core 22. Figure 16 shows the situation,
The heater 27 and the plane of the core 22 faced each other, and the radiant heat 28 from the heater 27 was directly applied to the plane of the core 22.

[Problems to be solved]

As described above, the support structure of the core 22 using the support frame 16 as shown in FIGS. 14 and 15 has a drawback that the support frame is difficult to assemble and take out. Furthermore, the support frame 16
Due to the structure in which the entire core 22 is supported so as to be sandwiched between them, there is a drawback that a relatively large number of constituent members of the support frame 16 are required, and the heat capacity is increased accordingly and more electric energy of the furnace is required. It was

Therefore, an object of the present invention is to provide a brazing hanger capable of supporting the core 22 with relatively few constituent parts and improving the reliability of brazing.

[Means for solving the problem]

The hanger of the present invention is such that when at least one of the components of the core that is in contact with each other is pre-clad with a brazing material and the brazing material is melted in the furnace and each component is hard brazed, It supports the core. In this core, both ends of the tubes 1 arranged in parallel are inserted into the holes of the tube plate 2, and the fins 3 are provided between the tubes 1.
Are arranged.

Here, the feature of the present invention is that the rim of the tube 1 is expanded and the outer periphery of the portion is formed larger than the hole of the tube plate 2. Further, a brazing material is clad on the outer surface of the tube plate 2 located on the upper side in the furnace. Then, both edges of the lower surface of the tube plate 2 parallel to the longitudinal direction are supported by the support body 4. A plurality of contact portions 5 that come into contact with the lower surface of the tube plate 2 are formed on the upper surface of the support body 4 and are spaced apart from each other in the longitudinal direction.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a main part of a first embodiment of the hanger,
FIG. 2 is a schematic perspective view of a main part of the hanger supporting the heat exchanger core, and FIG. 3 is a side view of the main part. Also the 6th
Figure is a front view showing the entire hanger, Figure 7 is the same plan view,
FIG. 8 is a cross-sectional view as seen from the direction of arrow AA in FIG. 7, showing a state in which the heat exchanger core 22 is supported.
Further, such a hanger is entirely housed in the furnace insertion / removal frame 14 as shown in FIG. 9, and the entire furnace insertion / removal frame 14 is inserted into or removed from the furnace.

In the hanger of this embodiment, as shown in FIG. 6 and FIG. 7, both ends of a pair of pipe members 10 arranged in parallel are connected by connecting members 11. Next, in each pipe material 10, a pair of U-shaped pieces 12 are arranged so that they face each other.
It is fixed to the lower surface of l0 by bolts 9 (Fig. 1).
The U-shaped piece is a short cut of the channel material. Next, the support bodies 4 made of round bar members are attached to the inner surfaces of the U-shaped pieces 12 via bolts 9, respectively. The upper surface of this support body 4 is scraped off to a flat fence except for a part thereof, and as a result, bamboo knot-shaped protrusions are formed only on the upper surface. The members of these hangers are made of stainless steel. Then, the lower surface of the tube plate 2 on the upper side of the core 22 is supported by the pair of supports 4, 4. At this time, the support 4
Only a plurality of contact portions 5 formed of ridges formed on the upper surface of the tube plate 2 contact the lower surface of the tube plate 2. In the tube plate 2 of this embodiment, an annular groove portion 20 is formed on the peripheral edge thereof as shown in FIG. 2, and a caulking portion 7 is provided on the side wall thereof. A skirt of a synthetic resin tank body (not shown) is fitted into the groove 20 via an O-ring later, and the caulking portion 7 is bent to form a liquid-tight tank structure. The corrugated fins disposed between the tube plate 2, the tube 1 inserted therein and the tubes 1, 1 are made of aluminum or its alloy material. The tube plate 2 has a core material of A300.
A3000 series, A6000 series (A6951 as an example) such as 3 or
A7000 series (A7072 as an example) is used, and at least the outer surface (air side) is clad with a brazing material (A4004 as an example) based on Al-Si or Al-Si-Mg. In this embodiment, the brazing material is clad on both sides of the core material. Further, a brazing material is attached to the outer surface of either one or both of the tube 1 and the corrugated fin. Then, both ends of the tube 1 penetrated by the tube plate 2 are expanded and the tube plate 2
Is locked in the hole. As shown in FIGS. 6 and 8, each of the cores 22 is suspended from the hanger only at its upper end. In order to suspend the core 22 on the main hanger, the tube plate 2 of the core may be inserted in parallel with the support 4 of the hanger. The hanger in which a large number of cores 22 are suspended in this way is locked or fixed to the furnace inserting / removing frame 14 as shown in FIG. And this frame for inserting and removing in the furnace
The entire 14 is inserted into and removed from the batch type vacuum brazing furnace in this embodiment. That is, as shown in Fig. 11, the center hawk
Both sides of the furnace inserting / removing frame 14 are supported by 29 and are inserted into the furnace 26. Then, the inside of the furnace 26 is evacuated and the inside of the furnace is heated by the heater 27, and the tube plate 2
The brazing material on the surface of other parts is melted. At this time, both sides of each core 22 are directed to the heater 27 side. Therefore, the radiant heat from the heater 27 is applied to each core 22 as shown in FIG.
The light is radiated from the oblique direction to the front side of the core. The hanger of the present invention holds only the upper end of the core 22, and the hanger does not cover the outer periphery of the core 22 so that the radiant heat reaches the front side of all the cores 22 by reflection without being disturbed by it. Can be heated uniformly. Then, a large number of cores can be suspended at the same time to improve mass productivity.

Next, when the brazing material on the surface of each component is melted in such a state, the furnace insertion / removal frame 14 is pulled out from the furnace 26 and immediately cooled by the fan. At this time, the blower fan cools the tubes and fins as well as the upper surface of the tube plate. Then, since the heat exchanger core originally has a very good heat dissipation property, it is cooled more rapidly than the hanger, and the tube plate 2 shrinks accordingly. However, since the support 4 of the hanger is relatively difficult to cool, the cooling rate is slow. When the support 4 is cooled from about 600 ° C., which is the brazing temperature of aluminum, to about 550 ° C. within the solidus temperature of the brazing material, the brazing material on the surface of the tube plate 2 is solidified. At this time, the tube plate 2 has already been cooled to about 400 ° C., but at this time, the tube plate 2 and the support body 4 are brought into a bonded state by the brazing material at the contact portion 5. This is because even if the tube plate 2 is rapidly cooled first, when the support body 4 is above the melting point of the brazing material, the brazing material that comes into contact with it is melted, so that the tube plate 2 is bonded to the support body 4. It is possible to freely contract relatively without doing. Then, the size is reduced as the support 4 and the tube plate 2 are cooled. Since the linear expansion coefficient of the aluminum tube plate is about 1.6 times that of the stainless steel pipe material 10, if the two are cooled to the same temperature at the same time, the amount of contraction of the support 4 will be small, so the melting point of the brazing material. In the following, the tube plate 2 in the adhered state with the support body 4 will be thermally distorted and will be in a stretched state. As a result, the dimensional accuracy may be deteriorated. However, since the core has a large heat dissipation property, the tube plate 2 is already sufficiently cooled by the fan and reduced in size. At this time, it is preferable to maintain the ratio of the temperature difference between the tube plate and the support 4 at about 400: 600. Then, the tube plate is hardly thermally strained thereafter, and its dimensional accuracy is not deteriorated.

In the cooled core 22, the lower surface of the tube plate 2 and the support body 4 are partially fixed by a brazing material, but may be peeled off by heat shock or the like due to a slight difference in thermal strain between the two. Or, even if it is not peeled off, the adhesive strength of the brazed portion is relatively weak. Moreover,
Since a plurality of contact portions 5 are projected on a part of the support 4 and the adhesive surface is small, the contact portions 5 and the tube plate 2 are easily separated. According to the experiment, peeling marks are formed on the outer surface of the tube plate after the peeling at the intervals of the contact portions 5, but the appearance is not so bad. Moreover, there is no deformation that adversely affects the dimensional accuracy in practice.

Next, FIGS. 4 and 5 respectively show other embodiments of the hanger support 4 of the present invention. In the embodiment shown in FIG. 4, the support 4 is made of a rectangular rigid body, and the contact portions 5 are provided on the upper surface of the support 4 so as to be separated from each other in the longitudinal direction. The contact portion 5 is formed as a ridge in the width direction of the support body 4. Next, in the embodiment shown in FIG. 5, the support 4 is formed in a screw shape, and the upper surface of each of the screw threads is in contact with the lower surface of the tube plate 2. Alternatively, the whole of the support 4 may be formed in a triangular shape, and unevenness may be formed at the top of the mountain, and the projection may support the lower surface of the tube plate 2. A coil spring may be attached to the outer circumference of the support 4 made of a round bar, and the upper surface of the outer circumference of the spring may support the lower surface of the tube plate 2. Alternatively, movable rings may be arranged at regular intervals on the outer circumference of the support 4 made of a round bar. When the coil spring and the ring are fitted to the round bar member in this way, the tube plate 2 is supported by the tube plate 2 through the coil even if the linear expansion coefficient of the support body 4 and the linear expansion coefficient of the tube plate 2 are different. Since it can be contracted or expanded independently of the above, there is no fear that the dimensional accuracy of the tube plate will be affected by the brazing.

In this embodiment, the cores 22 are arranged so that their respective planes face each other as shown in FIG. 6, but the present invention is not limited to this and may be arranged as shown in FIG.

In addition, the above-mentioned example shows an example in the vacuum brazing furnace, but it is not limited to the heating method including the semi-continuous furnace, the conveying method and the number of chambers of the brazing furnace,
This hanger can be used. Although the tube plate 2 does not have a tank body in this embodiment, the hem of the aluminum tank body is fitted to the outer peripheral edge of the tube plate 2 so that both are integrated in the furnace. The hanger can also be used for brazed structures. In this case, it is necessary to make the height of the U-shaped piece 12 sufficiently high in FIG. 1 to provide a margin for mounting the tank body on the upper surface of the tube plate 2.

〔The invention's effect〕

Since the hanger of the present invention is configured as described above, the contact surface between the tube plate and the hanger of the heat exchanger is reduced, and the hanger and the tube plate can be easily separated after brazing the heat exchanger core. Moreover, since the contact surface between the hanger and the tube plate is composed of a plurality of contact portions 5 that are spaced apart from each other in the longitudinal direction of the hanger and project upward, heat rays associated with radiation pass between the respective contact portions 5, 5. Therefore, the tube plate is surely heated, and the reliability of brazing of the tube plate and the tube is improved. Also,
The gas component generated by the melting of the brazing material is not retained between the hanger and the tube plate,
It can easily come out from the gap between 5 and maintain the homogeneity of the brazed part. That is, this hanger has a so-called gas escape structure.

Further, since the contact portion between the tube plate and the hanger is formed intermittently, the assembled heat exchanger can be easily supported by sliding it into the main hanger, which can be a hanger with good workability. . Moreover, since the hanger is configured to support the lower surface of the upper tube plate of the heat exchanger, the hanger can sufficiently support the weight of the heat exchanger and the weight of the hanger can be reduced. As a result, the heat capacity of the hanger is reduced, and energy can be saved accordingly.

Furthermore, the heat dissipation of the heat exchanger can be increased when the heat exchanger is taken out of the furnace at the end of brazing. That is,
Cooling of the heat exchanger is promoted because the number of contact portions between the heat exchanger having fins and originally having high heat dissipation and the hanger having poor heat dissipation compared to that is small. Further, air flows between the contact parts 5, 5 of the hanger, and cooling is promoted also from this point, which is suitable for mass production.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of the hanger, FIG. 2 is a schematic perspective view of an essential part of the hanger supporting a heat exchanger core, FIG. 3 is a side view of the hanger, and FIGS. Another embodiment of the hanger support 4 is shown. FIG. 6 is an overall front view of the hanger, FIG. 7 is a plan view of the same, and FIG. 8 is a view seen from the direction of the arrow AA in FIG. 7, showing a state in which the core 22 is supported. Show. FIG. 9 shows a state in which the hanger is attached to the furnace insertion / removal frame 14. FIG. 10 is an explanatory view showing how each core 22 is irradiated with radiant heat in the furnace 26, FIG. 11 is a plan explanatory view showing an insertion / removal state of the hanger, and FIG. 12 is its front view. FIG. 13 is a side view of the same, FIG. 14 is an explanatory view of a conventional hanger, and FIG. 15 shows a state in which the hanger is attached to the furnace insertion / removal frame 14.
FIG. 16 is a plan view showing the irradiation state of radiant heat in the furnace. 1 ... Tube, 2 ... Tube plate 3 ... Fin, 4 ... Support 5 ... Contact part, 6 ... Side member 7 ... Crimped part, 8 ... Steel strip 9 ... Bolt, 10 ... Pipe material 11 …… Connecting material, 12 …… U-shaped piece 13 …… Hook part, 14 …… Furnace insertion / removal frame 16 …… Support frame, 17 …… Horizontal material 18 …… Heat source, 19 …… Heat wire 20 …… Groove, 21 …… Hole 22 …… Core, 23 …… Clad material 24 …… Core material, 25 …… Bottom plate 26 …… Furnace, 27 …… Heater 28 …… Radiant heat, 29 …… Centerhawk 30 ...... Sidehawk

Claims (3)

(57) [Claims] 1. A heat exchanger core is assembled by inserting both ends of parallel tubes 1 into the holes of a tube plate 2 and arranging fins 3 between the tubes 1, and among the constituent parts of the core. A tube for supporting the core in the furnace when the brazing material is previously clad on at least one surface in contact with each other and the brazing material is melted in the furnace and the components are hard-brazed in the furnace. 1 has a rim of 1 widened and an outer periphery of that portion is formed larger than the hole of the tube plate 2, and is located above the inside of the furnace, and has an outer surface clad with a brazing material. A support 4 for supporting both edges of the lower surface of the plate 2 parallel to the longitudinal direction, and upper surface contact portions 5 of the support 4 contacting the lower surface of the plate 2 are separated from each other in the longitudinal direction. Up Hanger heat exchanger of the furnace during brazing, characterized in that it consists of those few protruding. 2. The support member 4 according to claim 1, wherein the support member 4 is composed of a pair of parallel rod members, and the contact portion 5 is formed by a plurality of protrusions protruding in the width direction on the upper surface thereof. The width of the ridge in the longitudinal direction is narrower than the space between adjacent ridges. 3. The rod according to claim 2, wherein the rod is made of stainless steel.