JP5816051B2 - Brazing furnace for aluminum products - Google Patents

Description

  The present invention relates to a brazing furnace for aluminum products such as an aluminum heat exchanger.

In a continuous furnace for brazing aluminum products described in the following patent documents, a heating zone, a water-cooled cooling zone, and an air-cooled cooling zone are connected in series, and these are connected by a conveyance path such as a conveyance roller. A muffle formed of a carbon material is attached to the inner wall of the heating zone. A large number of rod-shaped electric heaters are arranged in parallel inside, and the electric heater is inserted through a ceramic sleeve to protect the outer periphery of the heater.
Then, an inert gas is supplied to the inside of the furnace to reduce the oxygen concentration to a predetermined value or less, and the brazing material coated on the surface of each part is melted to integrally braze and fix the parts.

Japanese Patent Laid-Open No. 11-83332 JP 2008-105044 A

In the brazing furnace for aluminum products in the above-mentioned patent document, a ceramic sleeve is attached to the outer periphery of a rod-shaped electric heater to prevent the outer periphery of the heater from being contaminated by molten brazing material. For this reason, the inside of the furnace is indirectly heated through the ceramic sleeve, which has a disadvantage of poor thermal efficiency. Therefore, there is a drawback that the brazed product cannot be rapidly brought to the brazing temperature. Furthermore, there is a drawback that the control responsiveness is lacking.
Accordingly, it is an object of the present invention to maximize the thermal efficiency of the electric heater, increase the responsiveness, and to protect impurities such as a brazing material and a flux that are melted and dropped from adhering to the electric heater.

The present invention according to claim 1 is provided with a conveying path (3) for the brazed article (2) from the inlet to the outlet of the furnace body (1), and the conveying direction is mutually below the conveying path (3). In a brazing furnace for aluminum products in which a large number of bar-shaped electric heaters (4) are arranged along the transfer path (3),
Each of the electric heaters (4) is disposed so as to be exposed in the furnace, and a brace receiver (5) is provided only above the electric heater (4),
As the brazing receptacle (5), an elongate electric heater cover is disposed along the longitudinal direction of each electric heater (4), just below each electric heater (4), below the conveyance path (3),
It prevents the brazing material and flux from the brazed product (2) from adhering to the outer periphery of the electric heater (4) and the heat of each electric heater between the brazing receptacles (5). From the above, a brazing furnace for aluminum products constructed to be directly radiated to the brazed product (2) .

The present invention according to claim 2 is provided with a conveyance path (3) for the brazed article (2) from the inlet to the outlet of the furnace body (1), and the conveyance direction is mutually below the conveyance path (3). In a brazing furnace for aluminum products in which a large number of bar-shaped electric heaters (4) are arranged along the transfer path (3),
Each of the electric heaters (4) is disposed so as to be exposed in the furnace, and a brace receiver (5) is provided only above the electric heater (4),
As the brazing receptacle (5), a dish-like plate (5c) is detachably attached to the bottom of a storage container (6) that accommodates the item to be brazed (2) and moves on the conveyance path (3). ,
This is a brazing furnace for aluminum products in which impurities such as brazing filler metal and flux melted and dropped from the brazed product (2) are prevented from adhering to the outer periphery of the electric heater (4) .
According to a third aspect of the present invention, there is provided a brazing furnace for an aluminum product according to the first or second aspect ,
This is a brazing furnace for aluminum products in which a bottom receiver (14) is placed on the bottom of the inner wall of the furnace body (1), and impurities such as a molten brazing material and flux can be accommodated therein.

In the brazing furnace of the present invention, a rod-shaped electric heater 4 is disposed so as to be exposed in the furnace, and a brazing receptacle 5 is provided only above the electric heater 4 disposed below the transfer furnace. Since impurities such as brazing material and flux are prevented from adhering to the outer periphery of the heater 4, the heating efficiency can be improved and the thermal efficiency can be maintained permanently.
That is, each rod-shaped electric heater 4 is exposed in the furnace, and the brazing receptacle 5 is provided only above the electric heater 4 disposed on the lower side of the transfer furnace, so that the brazed article 2 can be efficiently used. Can be heated. Moreover, since it is possible to prevent impurities such as molten brazing material and flux falling from the brazed product 2 from adhering to the electric heater 4 by the brazing receiver 5, the heating efficiency can be maintained permanently.

Further , an elongate electric heater cover is arranged as the brazing receiver 5 just above the electric heater 4, and the heat of each electric heater is directly radiated to the brazed article (2) from between the brazing receivers (5). Since it is comprised so that the heating efficiency by the electric heater 4 can further be improved, it can prevent reliably that impurities, such as a fusion | melting brazing material and a flux, adhere to the electric heater 4.
As described in claim 2, when the dish-like plate 5c is provided at the bottom of the storage container 6 for storing the article to be brazed 2 as the brazing receiver 5, the structure is simple and reliable from the article to be brazed 2 Thus, it is possible to reliably prevent impurities such as the molten brazing material and flux from adhering to the conveying roller 7 and the electric heater 4.
In the above configuration, as described in claim 3, when the bottom receiver 14 is placed on the bottom of the inner wall of the furnace body 1, and impurities such as a molten brazing material and flux can be accommodated therein, Corrosion of the metal wall of the furnace body 1 can be prevented.

The cross-sectional schematic of the brazing furnace of the aluminum product of this invention. The II-II line longitudinal cross-section schematic of FIG. The longitudinal cross-section schematic of 2nd Example of this invention. The longitudinal cross-section schematic of 3rd Example of this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
1 is a schematic cross-sectional view of a first embodiment of the present invention, and FIG. 2 is a schematic vertical cross-sectional view thereof, which is a schematic cross-sectional view taken along the line II-II in FIG.

(First embodiment)
The brazing furnace of the present invention has an outer wall from the outside, a heat insulating material 8, an inner wall, and a lining 9 made of a carbon material deposited on the inside of the inner wall. A pair of airtight boxes 13 are provided on both outer sides. In this example, a large number of conveying rollers 7 are arranged in parallel at equal intervals from the inlet 12 toward an outlet (not shown) in the furnace of the furnace body 1. Each transport roller 7 is driven by a drive mechanism 10 such as a chain or a sprocket. Further, in the furnace, a large number of rod-shaped electric heaters 4 are arranged in the conveying direction of the conveying path 3 so as to be close to the ceiling and the bottom.

  The electric heater 4 is disposed so as to be exposed in the furnace, and the outer periphery thereof is not covered with a ceramic sleeve or the like. This is to increase the heating efficiency. Then, an electric heater cover covers the upper side of the electric heater 4 along the electric heater 4 directly above the electric heater 4 positioned on the lower side. In this example, both ends of the electric heater cover are supported by the furnace body 1 via the support material 11. An inert gas is supplied to the hermetic box 13 on the outer periphery of the furnace body 1 to prevent external oxygen from entering the furnace from a bearing portion such as the transport roller 7.

  Further, an inert gas such as nitrogen is supplied into the furnace, and the electric heater 4 is energized. When the inside of the furnace reaches the brazing temperature, the article to be brazed 2 composed of the assembly of each part is supplied from the inlet 12 into the furnace body 1 by the conveying path 3. At that time, the outer circumference of the electric heater 4 is not covered with the conventional ceramic sleeve, so that the temperature of the article to be brazed rises rapidly. Then, the brazing material coated or sandwiched between the parts of the parts to be brazed 2 that are in contact with each other is melted in the furnace.

  The molten brazing material and flux are supplied between the contact parts of each component, and a part thereof falls. Most of the dropped impurities such as brazing filler metal and flux fall on the bottom receiver 14 disposed on the bottom surface of the furnace body 1. Further, a part falls on the electric heater cover existing above the electric heater 4, and a part is held there, and further falls and adheres to the bottom receiver 14. At this time, since the electric heater cover completely covers the upper portion of the electric heater 4, impurities such as a molten brazing material and flux do not adhere to the electric heater 4. For this reason, the electric heater is prevented from being contaminated, and there is no possibility of lowering the thermal efficiency. Further, since impurities such as dropped flux fall on the bottom receiver 14, it is possible to prevent the flux from corroding the metal outer wall of the furnace body 1 through the lining 9 and the heat insulating material 8.

(Second embodiment)
Next, FIG. 3 is a schematic longitudinal sectional view of a second embodiment of the present invention. This example is different from that of FIG. 2 in that the plate 5b arranged continuously between the conveyance path 3 and the electric heater 4 is shown. It is. The plate 5b covers the entire upper portion of the electric heater 4 so that impurities such as a brazing material and a flux melted and dropped from the brazed product 2 do not adhere to the electric heater 4.
Impurities such as falling brazing material and flux from the brazed product 2 adhere to the plate 5b.

(Third embodiment)
Next, FIG. 4 shows a third embodiment of the present invention. In this example, the article to be brazed 2 moves on the conveying path 3 while being stored in the storage container 6. A dish-shaped plate 5c is detachably disposed on the bottom of the storage container 6, and the item 2 to be brazed is placed on the dish-shaped plate 5c. Impurities such as brazing filler metal and flux that melt and fall from the brazed product 2 adhere to the dish-like plate 5c and do not flow out from the brace receiver 5.

In any embodiment, impurities such as brazing material and flux melted and dropped from the brazed product 2 are prevented from adhering to the electric heater 4 and the exposed electric heater 4 is protected. As a result, the thermal efficiency of the electric heater 4 can be increased and the temperature of the article to be brazed can be rapidly increased.
Also in the second and third embodiments, it is preferable to provide the bottom receiver 14 placed on the bottom surface of FIG.

DESCRIPTION OF SYMBOLS 1 Furnace body 2 Brazing goods 3 Conveyance path 4 Electric heater 5 Brazing receptacle
5b plate
5c dish plate

6 Storage Container 7 Transport Roller 8 Heat Insulation Material 9 Lining
10 Drive mechanism
11 Support material
12 entrance
13 Airtight box
14 Bottom holder

Claims (3)

A conveying path (3) for the brazed product (2) is provided from the inlet to the outlet of the furnace body (1), and a number of bar-shaped electric heaters (one below the conveying path (3) are separated from each other in the conveying direction ( In the brazing furnace for aluminum products 4) is arranged along the transfer path (3),
Each of the electric heaters (4) is disposed so as to be exposed in the furnace, and a brace receiver (5) is provided only above the electric heater (4),
As the brazing receptacle (5), an elongate electric heater cover is disposed along the longitudinal direction of each electric heater (4), just below each electric heater (4), below the conveyance path (3),
It prevents the brazing material and flux from the brazed product (2) from adhering to the outer periphery of the electric heater (4) and the heat of each electric heater between the brazing receptacles (5). From the above, a brazing furnace for aluminum products, which is configured to be directly radiated to the brazed product (2) . A conveying path (3) for the brazed product (2) is provided from the inlet to the outlet of the furnace body (1), and a number of bar-shaped electric heaters (one below the conveying path (3) are separated from each other in the conveying direction ( In the brazing furnace for aluminum products 4) is arranged along the transfer path (3),
Each of the electric heaters (4) is disposed so as to be exposed in the furnace, and a brace receiver (5) is provided only above the electric heater (4),
As the brazing receptacle (5), a dish-like plate (5c) is detachably attached to the bottom of a storage container (6) that accommodates the item to be brazed (2) and moves on the conveyance path (3). ,
A brazing furnace for aluminum products in which impurities such as brazing material and flux melted and dropped from the brazed product (2) are prevented from adhering to the outer periphery of the electric heater (4). In the brazing furnace for aluminum products according to claim 1 or 2 ,
A brazing furnace for an aluminum product in which a bottom receiver (14) is placed on the bottom of the inner wall of the furnace body (1) so that impurities such as a molten brazing material and flux can be accommodated therein.

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