阅读说明：本技术 铝合金真空钎焊炉的外循环冷却式快速气淬系统 (External circulation cooling type rapid gas quenching system of aluminum alloy vacuum brazing furnace ) 是由 张红梅 解永强 王成君 靳丽岩 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种铝合金真空钎焊炉的外循环冷却式快速气淬系统,解决了在不增加设备空间的前提下如何缩短气淬初始阶段时间的问题。在铝合金真空钎焊炉上设置外循环式冷却系统,使其成为真空钎焊与循环冷却气淬一体设备；在气淬启动前,将外循环冷却系统管道抽真空,再将高压惰性气体通入到外循环冷却系统的管路中；在气淬初始阶段,同时将惰性气体压力气罐和充满有高压惰性气体的外循环冷却系统管路中的惰性气体,同时充入到铝合金真空钎焊炉的加热室中；在铝合金真空钎焊炉的长方形加热室的冷却气体进气通道上,增设气体导流分流罩,起到气淬冷却气体能在长方形加热室中均匀地分配循环的作用,在气淬循环阶段提高铝合金件的气淬表面硬度均匀性。(The invention discloses an external circulation cooling type rapid gas quenching system of an aluminum alloy vacuum brazing furnace, which solves the problem of shortening the initial stage time of gas quenching on the premise of not increasing the equipment space. An external circulation type cooling system is arranged on the aluminum alloy vacuum brazing furnace to form vacuum brazing and circulating cooling gas quenching integrated equipment; before the gas quenching is started, vacuumizing the pipeline of the external circulation cooling system, and introducing high-pressure inert gas into the pipeline of the external circulation cooling system; at the initial stage of gas quenching, simultaneously filling an inert gas pressure gas tank and inert gas in a pipeline of an external circulation cooling system filled with high-pressure inert gas into a heating chamber of the aluminum alloy vacuum brazing furnace; the gas diversion flow distribution cover is additionally arranged on a cooling gas inlet channel of a rectangular heating chamber of the aluminum alloy vacuum brazing furnace, so that the effect that gas quenching cooling gas can be uniformly distributed and circulated in the rectangular heating chamber is achieved, and the uniformity of the gas quenching surface hardness of an aluminum alloy part is improved in a gas quenching circulation stage.)

1. An external circulation cooling type rapid gas quenching system of an aluminum alloy vacuum brazing furnace comprises a vacuum furnace body (1), wherein a vacuum pumping pipe (2) and an inert high-pressure gas inlet (12) are respectively arranged on the vacuum furnace body (1), the other end of the vacuum pumping pipe (2) is connected with a vacuumizing system (3), the inert high-pressure gas inlet (12) is connected with an inert high-pressure gas inlet pipe (13), the other end of the inert high-pressure gas inlet pipe (13) is connected with an inert high-pressure gas storage tank (11), the external circulation cooling type rapid gas quenching system is characterized in that a gas quenching circulation gas outlet (8) and a gas quenching circulation gas inlet (4) are respectively arranged on the vacuum furnace body (1), a gas quenching circulation gas outlet pipe (9) is connected on the gas quenching circulation gas outlet (8), the other end of the gas quenching circulation gas outlet pipe (9) is communicated with a gas inlet (10) of a two-stage water-cooled heat exchanger (, the gas outlet of the two-stage water-cooling heat exchanger (7) is connected with the air inlet of the circulating fan (6), the air outlet of the circulating fan (6) is communicated with the gas quenching circulating gas inlet (4) through the gas quenching circulating gas input pipe (5), the gas quenching circulating gas output pipe (9) is provided with an inert high-pressure gas branch pipe access port (15), and an inert high-pressure gas access branch pipe (14) is connected between the inert high-pressure gas branch pipe access port (15) and the inert high-pressure gas access pipe (13).

2. The external circulation cooling type rapid gas quenching system for aluminum alloy vacuum brazing furnace according to claim 1, wherein an upper inlet is uniformly provided on the top surface of the rectangular heating chamber (18) in the vacuum furnace body (1), an upper inlet branch pipe (23) is connected to the upper inlet, a rear inlet is uniformly provided on the rear side surface of the rectangular heating chamber (18) in the vacuum furnace body (1), a rear inlet branch pipe (24) is connected to the rear inlet, a lower inlet is uniformly provided on the bottom surface of the rectangular heating chamber (18) in the vacuum furnace body (1), a lower inlet branch pipe (25) is connected to the lower inlet, an advancing inlet is uniformly provided on the front side surface of the rectangular heating chamber (18) in the vacuum furnace body (1), a front inlet branch pipe (26) is connected to the front inlet, and a closed conical inlet is connected between the gas quenching circulation gas inlet (4) and the rectangular heating chamber (18) A body-shaped air volume distribution cavity cover body (16), a central conical bulge (20) is fixedly arranged on the right side end surface of the inner cavity of the closed cone-shaped air volume distribution cavity cover body (16), four windmill blade-shaped wind collecting plates (21) are arranged between the central conical bulge (20) and the inner side wall of the cone-shaped wind distribution cavity cover body (16) at equal intervals in radian, wind quantity shunting chambers (22) are formed between the outer side surfaces of two adjacent windmill blade-shaped wind collecting plates (21) and the central conical bulge (20) and the inner side wall of the cone-shaped wind distribution cavity cover body (16), an upper wind inlet shunting pipe (23) is communicated with the upper wind quantity shunting chamber, a rear wind inlet shunting pipe (24) is communicated with the rear wind quantity shunting chamber, a lower wind inlet shunting pipe (25) is communicated with the lower wind quantity shunting chamber, and a front wind inlet shunting pipe (26) is communicated with the front wind quantity shunting chamber.

Technical Field

The invention relates to an aluminum alloy vacuum brazing furnace, in particular to equipment for performing rapid gas quenching after vacuum brazing on an aluminum alloy part, which is suitable for performing vacuum brazing and gas quenching on aluminum alloy parts such as chassis, heat exchange plates, antennas and the like in the fields of aerospace, aviation, ships, automobiles and the like.

Background

The aluminum alloy vacuum brazing mainly comprises two steps, wherein the first step is vacuum brazing, and the second step is gas quenching of a welding piece; the vacuum brazing is carried out in a vacuum brazing furnace, and the specific process comprises the following steps: filling welding brazing filler metal between welded aluminum alloy pieces placed in a furnace, vacuumizing and heating the furnace body after a furnace door is closed, melting the brazing filler metal in a vacuum high-temperature environment, and connecting the two aluminum alloy pieces together to finish brazing; then, carrying out gas quenching process on the weldment, wherein two types of existing gas quenching equipment are provided, one type is that an internal circulation cooling type gas quenching system is arranged in the vacuum brazing furnace, and the other type is that the gas quenching equipment is independently arranged; the specific process of gas quenching is as follows: the method comprises the following steps of quickly introducing high-pressure low-temperature inert gas into a vacuum furnace or another independent gas quenching furnace, quickly changing the vacuum environment of a heating chamber into an inert gas filled environment with pressure, starting a circulating fan after the pressure of the inert gas in the heating chamber reaches a certain value, circulating the inert gas in the heating chamber, and cooling the circulated inert gas through a cooling system to realize quick gas quenching on an aluminum alloy piece, so that the temperature of the aluminum alloy piece is quickly and uniformly reduced to the temperature required by the specified gas quenching finishing process, and the surface hardness of the aluminum alloy reaches the design requirement; practice proves that: the surface hardness of the aluminum alloy part is closely related to the temperature reduction rate of the aluminum alloy part in the gas quenching process, and the faster the temperature reduction rate is, the higher the surface hardness of the gas quenching is; the uniformity of the surface hardness of the aluminum alloy part is closely related to the uniformity of the cooling gas introduced by gas quenching, and the better the uniformity of the inert cooling gas introduced into the furnace body is, the better the uniformity of the surface hardness of the aluminum alloy part after gas quenching is.

If the gas quenching is staged, the gas quenching can be generally divided into two stages, namely, an initial stage of gas quenching and a cycle stage of gas quenching; an inert gas inflation interface is arranged on the existing aluminum alloy vacuum brazing furnace, when in gas quenching operation, a pressure gas tank filled with inert gas is connected to the interface, and the inert gas enters the vacuum brazing furnace through the inflation interface on the aluminum alloy vacuum brazing furnace to carry out gas quenching on a welding piece; because the air charging interface arranged on the aluminum alloy vacuum brazing furnace is limited by the volume capacity of the aluminum alloy vacuum brazing furnace equipment, the inner diameter size of the air charging interface cannot be too large, when the air quenching operation is carried out, high-pressure inert gas in an inert gas pressure gas tank enters the furnace body through the air charging interface and reaches the circulating pressure, certain air charging time is needed, namely the time of the initial stage of air quenching, the time needed by the initial stage of air quenching is short, the improvement of the surface hardness of the air quenching of an aluminum alloy part can be facilitated, the time of the initial stage of air quenching can be shortened as far as possible under the premise that the volume of the existing equipment is not increased, and the air quenching furnace becomes a subject to be researched and solved on site; in addition, the heating chamber in the furnace body of the existing aluminum alloy vacuum brazing furnace is generally cylindrical, and some welded aluminum alloy pieces need to be rectangular, but how to ensure that the heating chamber is rectangular, the gas quenching cooling gas can be uniformly distributed and circulated in the heating chamber to ensure the gas quenching quality of the welded pieces in the gas quenching circulation stage is also a technical problem which needs to be solved urgently on site.

Disclosure of Invention

The invention provides an external circulation cooling type rapid gas quenching system of an aluminum alloy vacuum brazing furnace, which solves the technical problems of shortening the initial stage time of gas quenching on the premise of not increasing the equipment space and ensuring the surface hardness quality of the gas quenching of an aluminum alloy part in the gas quenching circulation stage when a heating chamber of the aluminum alloy vacuum brazing furnace is cuboid.

The invention solves the technical problems by the following technical scheme:

the general concept of the invention is: an external circulation type cooling system is arranged on the aluminum alloy vacuum brazing furnace to form vacuum brazing and circulating cooling gas quenching integrated equipment; before starting gas quenching, vacuumizing an external circulation cooling system pipeline, and introducing high-pressure inert gas into a pipeline of the external circulation cooling system; in the initial stage of gas quenching, inert gas in an inert gas pressure gas tank and an external circulation cooling system pipeline filled with high-pressure inert gas are simultaneously filled into a heating chamber of the aluminum alloy vacuum brazing furnace, so that the gas flow of the cooling gas is increased, and the purposes of shortening the time used in the initial stage of gas quenching and quickly reducing the temperature of an aluminum alloy welding part are achieved; the gas diversion flow distribution cover is additionally arranged on a cooling gas inlet channel of a rectangular heating chamber of the aluminum alloy vacuum brazing furnace, so that the gas quenching cooling gas can be uniformly distributed and circulated in the rectangular heating chamber, and the uniformity of the surface hardness of the aluminum alloy part in the gas quenching circulation stage is improved.

An external circulation cooling type rapid gas quenching system of an aluminum alloy vacuum brazing furnace comprises a vacuum furnace body, wherein a vacuum exhaust pipe and an inert high-pressure gas inlet are respectively arranged on the vacuum furnace body, the other end of the vacuum exhaust pipe is connected with a vacuumizing system, the inert high-pressure gas inlet is connected with an inert high-pressure gas inlet pipe, the other end of the inert high-pressure gas inlet pipe is connected with an inert high-pressure gas storage tank, a gas quenching circulating gas output port and a gas quenching circulating gas input port are respectively arranged on the vacuum furnace body, the gas quenching circulating gas output port is connected with a gas quenching circulating gas output pipe, the other end of the gas quenching circulating gas output pipe is communicated with a gas input port of a two-stage water-cooling heat exchanger, a gas output port of the two-stage water-cooling heat exchanger is connected with a gas inlet of a circulating fan, and an air outlet of the circulating fan is communicated with the gas quenching, an inert high-pressure gas branch pipe access port is arranged on the gas quenching circulating gas output pipe, and an inert high-pressure gas access branch pipe is connected between the inert high-pressure gas branch pipe access port and the inert high-pressure gas access pipe.

An upper air inlet is uniformly arranged on the top surface of a cuboid heating chamber in the vacuum furnace body, an upper air inlet branch pipe is connected on the upper air inlet, a rear air inlet is uniformly arranged on the rear side surface of the cuboid heating chamber in the vacuum furnace body, a rear air inlet branch pipe is connected on the rear air inlet, a lower air inlet is uniformly arranged on the bottom surface of the cuboid heating chamber in the vacuum furnace body, a lower air inlet branch pipe is connected on the lower air inlet, a front air inlet is uniformly arranged on the front side surface of the cuboid heating chamber in the vacuum furnace body, a front air inlet branch pipe is connected on the front air inlet, a closed cone-shaped air quantity distribution cavity cover body is connected between an air quenching circulating gas inlet and the cuboid heating chamber, a central cone-shaped bulge is fixedly arranged on the right side end surface of an inner cavity of the closed cone-shaped air quantity distribution cavity cover body, and between the central cone-shaped bulge and the inner side wall of the cone, four windmill blade-shaped wind collecting plates are arranged at equal intervals in a radian manner, a wind flow distribution chamber is formed between the outer side surface of the central conical bulge and the inner side wall of the conical wind distribution cavity cover body of two adjacent windmill blade-shaped wind collecting plates, an upper wind inlet branch pipe is communicated with the wind flow distribution chamber at the upper side, a rear wind inlet branch pipe is communicated with the wind flow distribution chamber at the rear side, a lower wind inlet branch pipe is communicated with the wind flow distribution chamber at the lower side, and a front wind inlet branch pipe is communicated with the wind flow distribution chamber at the front side.

The invention relates to an external circulation cooling type rapid gas quenching system of an aluminum alloy vacuum brazing furnace

The method realizes that the aluminum alloy product can be directly subjected to rapid gas quenching after the vacuum brazing is finished, reduces energy consumption, shortens process period, reduces equipment cost and ensures gas quenching quality.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the circulation path of the inert cooling cycle gas during the gas quench cycle of the present invention;

fig. 3 is a schematic structural view of the conical air volume distribution cavity cover 16 of the present invention.

Detailed Description

The invention is described in detail below with reference to the accompanying drawings:

an external circulation cooling type rapid gas quenching system of an aluminum alloy vacuum brazing furnace comprises a vacuum furnace body 1, a vacuum pumping pipe 2 and an inert high-pressure gas inlet 12 are respectively arranged on the vacuum furnace body 1, the other end of the vacuum pumping pipe 2 is connected with a vacuum pumping system 3, the inert high-pressure gas inlet 12 is connected with an inert high-pressure gas inlet pipe 13, the other end of the inert high-pressure gas inlet pipe 13 is connected with an inert high-pressure gas storage tank 11, the vacuum furnace body 1 is respectively provided with a gas quenching circulating gas outlet 8 and a gas quenching circulating gas inlet 4, the gas quenching circulating gas outlet 8 is connected with a gas quenching circulating gas outlet pipe 9, the other end of the gas quenching circulating gas outlet pipe 9 is communicated with a gas inlet 10 of a two-stage water-cooling heat exchanger 7, the gas outlet of the two-stage water-cooling heat exchanger 7 is connected with a gas inlet of a circulating fan, an air outlet of the circulating fan 6 is communicated with a gas quenching circulating gas input port 4 through a gas quenching circulating gas input pipe 5, an inert high-pressure gas branch pipe access port 15 is arranged on a gas quenching circulating gas output pipe 9, and an inert high-pressure gas access branch pipe 14 is connected between the inert high-pressure gas branch pipe access port 15 and an inert high-pressure gas access pipe 13.

The vacuumizing system 3 vacuumizes the cuboid heating chamber 18 and the whole external circulating cooling system in the vacuum furnace body 1 through the vacuum exhaust tube 2, after the vacuumizing is completed, a valve on the gas quenching circulating gas output port 8 and the gas quenching circulating gas input port 4 are closed, the vacuum furnace body 1 performs vacuum brazing on the aluminum alloy piece in the cuboid heating chamber 18, meanwhile, a valve on the inert high-pressure gas inlet branch tube 14 is opened, the inert high-pressure gas storage tank 11 is communicated with a pipeline of the external circulating cooling system, the pipeline of the external circulating cooling system is filled with the inert high-pressure gas, and then the valve on the inert high-pressure gas inlet branch tube 14 is closed; after the aluminum alloy piece is subjected to vacuum brazing, in the initial stage of gas quenching, a valve which is arranged on an inert high-pressure gas access pipe 13 and is communicated with a cuboid heating chamber 18 in a vacuum furnace body 1 and a valve on a gas quenching circulating gas inlet 4 are opened at the same time, so that the inert high-pressure gas in an inert high-pressure gas storage tank 11 and the inert high-pressure gas in an external circulating cooling system pipeline are introduced into the cuboid heating chamber 18, the inert gas inflow amount in the vacuum furnace in the initial stage of gas quenching is greatly increased, the temperature of the welded aluminum alloy piece is rapidly reduced, and the gas quenching quality in the initial stage of gas quenching is improved.

An upper air inlet is uniformly arranged on the top surface of a cuboid heating chamber 18 in a vacuum furnace body 1, an upper air inlet branch pipe 23 is connected on the upper air inlet, a rear air inlet is uniformly arranged on the rear side surface of the cuboid heating chamber 18 in the vacuum furnace body 1, a rear air inlet branch pipe 24 is connected on the rear air inlet, a lower air inlet is uniformly arranged on the bottom surface of the cuboid heating chamber 18 in the vacuum furnace body 1, a lower air inlet branch pipe 25 is connected on the lower air inlet, a front air inlet is uniformly arranged on the front side surface of the cuboid heating chamber 18 in the vacuum furnace body 1, a front air inlet branch pipe 26 is connected on the front air inlet, a closed cone-shaped air quantity distribution cavity cover body 16 is connected between a gas quenching circulating gas inlet 4 and the cuboid heating chamber 18, a central cone-shaped bulge 20 is fixedly arranged on the right side end surface of an inner cavity of the closed cone-shaped air quantity distribution cavity cover body 16, four wind-wheel-blade-shaped wind-collecting plates 21 are arranged at equal intervals in a radian manner between the central conical projection 20 and the inner side wall of the conical wind-distribution cavity cover 16, wind-quantity distribution chambers 22 are formed between the outer side surfaces of two adjacent wind-wheel-blade-shaped wind-collecting plates 21 and the central conical projection 20 and the inner side wall of the conical wind-distribution cavity cover 16, an upper wind-quantity distribution chamber 23 is communicated with an upper wind-quantity distribution chamber, a lower wind-quantity distribution chamber 25 is communicated with a lower wind-quantity distribution chamber, and a front wind-quantity distribution chamber 26 is communicated with a front wind-quantity distribution chamber.

When entering a second gas quenching stage, namely a gas quenching cycle stage, closing a valve on the inert high-pressure gas access pipe 13, and feeding the inert high-pressure gas cooled by the two-stage water-cooled heat exchanger 7 into a left end air inlet of a closed cone-shaped air distribution cavity cover 16 and an outer circulation cooling system in the vacuum furnace body 1 by the circulating fan 6 to uniformly distribute the entering air into four air distribution chambers 22 in the air distribution cavity cover 16, wherein the cooling air distributed into each air distribution chamber 22 enters an air inlet on the corresponding surface of the corresponding rectangular parallelepiped heating chamber 18 through a group of air inlet branch pipes uniformly distributed on each air distribution chamber and enters the rectangular parallelepiped heating chamber 18 to perform gas quenching on aluminum alloy welding pieces in the rectangular parallelepiped heating chamber 18, and the inert gas heated by the gas quenching passes through an air outlet on the left side surface and an air outlet on the right side surface of the rectangular parallelepiped heating chamber 18 The gas quenching circulating gas enters a gas quenching circulating gas output pipe 9 through a gas quenching circulating gas output port 8, passes through the gas quenching circulating gas output pipe 9, enters a two-stage water-cooled heat exchanger 7 for cooling, is blown into a gas quenching circulating gas input pipe 5 by a circulating fan 6 after being cooled, and enters a cuboid heating chamber 18 in the vacuum furnace body 1 again, and the circulation is carried out to finish the gas quenching of the aluminum alloy part; the innovation points of the closed cone-shaped air volume distribution cavity cover 16 of the invention are as follows: the outer side of the central conical bulge 20 in the air quantity shunting chamber 22 has the function of streamline type diversion when entering the air quantity shunting chamber, so that cooling air enters the air inlet branch pipe to the maximum extent, four notches in clockwise rotation direction are arranged at the upper ends of four windmill blade-shaped air collecting plates 21 on the outer side of the central conical bulge 20, the function of guiding a small amount of cooling air quantity which does not enter the air inlet branch pipe into the adjacent air quantity shunting chamber is formed, and the function of improving circulating cooling air quantity is also played.