An air circulation device for ultra-large furnace with high temperature uniformity

Abstract

The present invention relates to an air circulation device for ultra-large furnaces with high furnace temperature uniformity. By incorporating a sweeping nozzle structure and a hinged expansion mechanism, the device addresses the issues of reduced furnace temperature uniformity caused by an enlarged furnace and the failure of the expansion joints in the device's height direction. This prevents the escape of high-temperature circulating furnace gas, ensuring that the overall solid solution heating of ultra-large aluminum alloy parts meets the requirements of aluminum alloy heat treatment processes.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy heat treatment equipment, in particular to an air-guiding circulation device with a super-large furnace chamber and high furnace temperature uniformity. Background Art

[0002] As the diameter of rocket bodies in the aerospace industry continues to increase, aluminum alloy parts for large-diameter rockets must be subjected to overall solution heat treatment, creating an urgent need for corresponding overall solution heat treatment equipment for ultra-large aluminum alloy parts. When treating these ultra-large aluminum alloy parts, the furnace size must be significantly increased while maintaining a high furnace temperature uniformity of ±3°C. This requires more uniform injection of high-temperature furnace gas into the effective heating zone, placing higher demands on the hot air circulation system of the heat treatment equipment.

[0003] Existing heat treatment equipment for aluminum alloy components utilizes a roller-hearth furnace, heating the component surface by directing hot air into high-speed jets. This hot air is ejected via a wedge-shaped air jet arm positioned above the rollers within the furnace and an air jet box at the bottom of the rollers. The air jet arm is equipped with downward-facing air jets, while the air jet box houses several air jet pipes with upward-facing, shower-like nozzles at their ends. During operation, the fan drives air from the furnace into the air duct, where it is heated and ejected into high-speed jets from the air jets and shower-like nozzles. This circulates the hot air and stabilizes the furnace temperature.

[0004] However, the aforementioned equipment can only process smaller aluminum alloy components. As the furnace size increases, the fan power, heating power, and air guide structure also increase. Under the same circulating air volume and injection velocity, the use of the aforementioned air guide structure will result in reduced furnace temperature uniformity, failing to meet the high furnace temperature uniformity of ±3°C required by aluminum alloy heat treatment processes.

[0005] In addition, the air guide system of the above-mentioned equipment is constantly filled with 600°C high-temperature circulating furnace gas during the production process, and the steel structure of the air guide system undergoes thermal deformation. The high-temperature deformation causes the reserved expansion interface of the air guide structure to fail to bite, further causing the heat-resistant steel structure to produce unexpected displacement deformation during production and furnace shutdown. The displacement deformation causes interference between the air guide system and the transmission system, making continuous and stable production impossible. When the gap in the reserved expansion interface of the air guide structure is enlarged, a large amount of high-temperature circulating furnace gas escapes from the gap, further affecting the furnace temperature uniformity of the effective heating area, and failing to meet the production process requirements of large aluminum alloy parts. Summary of the Invention

[0006] In view of the defects existing in the prior art, the purpose of the present invention is to provide an air-guiding circulation device with high furnace temperature uniformity for an ultra-large furnace, so as to solve the problem of reduced furnace temperature uniformity caused by the increase in the furnace, and the problem of bite failure of the expansion interface in the height direction of the equipment, so that the overall solid solution heating of ultra-large aluminum alloy parts meets the requirements of the aluminum alloy heat treatment process.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0008] An air guide circulation device for high furnace temperature uniformity in a super large furnace, characterized in that it comprises an air guide circulation system composed of multiple groups of air guide steel structures, each group of air guide steel structures comprising an upper air guide part and a lower air guide part

[0009] Furthermore, the upper air guide part includes a high-temperature circulation fan 1, a fan volute 2 is located outside the high-temperature circulation fan 1, and the air outlet of the fan volute 2 is connected to the top air guide cover 3, and a heater is installed inside the top air guide cover 3;

[0010] The wind guide hood 3 connected to the fan volute 2 of the high-temperature circulation fan 1 is connected to the side spray air box 7. The upper part of the side spray air box I7 is connected to the top spray arm 6. The lower part of the top spray arm 6 is provided with multiple air outlets, and the lower part of the side spray air box I7 is provided with multiple side spray air windows 8; after the high-temperature furnace gas is heated by the heater, it passes through the top spray arm 6 and the side spray air box I7 and is sprayed out from the air outlet and the side spray air window 8 respectively.

[0011] Furthermore, the lower air guide part includes a high-temperature circulation fan 1, a fan volute 2 is located outside the high-temperature circulation fan 1, and the air outlet of the fan volute 2 is connected to the top air guide cover 3, and a heater is installed inside the top air guide cover 3;

[0012] The wind guide hood 3 connected to the fan volute 2 of the high-temperature circulation fan 1 is connected to the side spray air box II10, and the roller through-hole box 14 is connected to the bottom of the side spray air box II10. The roller through-hole box 14 is connected to the bottom spray air box I11 located at the bottom of the furnace. The lower part of the side spray air box II10 is provided with a plurality of side spray air windows 8, and the upper part of the bottom spray air box I11 is provided with a plurality of shower-type bottom spray air nozzles; after the high-temperature furnace gas is heated by the heater, it passes through the side spray air box II10, the roller through-hole box 14 and the bottom spray air box I11 in sequence and is sprayed out from the side spray air windows 8 and the shower-type bottom spray air nozzles.

[0013] Furthermore, each air outlet at the bottom of the top spray arm 6 is movably connected to a sweeping nozzle 21, and a guide device is provided below the sweeping nozzle. The guide device drives all the nozzles 21 to make circumferential motion in the horizontal direction through an external drive device.

[0014] Furthermore, the air outlet is a spherical interface 23, the upper end interface of the sweeping nozzle 21 is a spherical joint, and the spherical joint of the sweeping nozzle 21 is embedded in the spherical interface 23 to form a spherical hinged fit.

[0015] Furthermore, the guide device is a guide frame 22 arranged around the sweeping nozzle 21, and the guide frames 22 of all the sweeping nozzles are connected to each other to form a network structure.

[0016] Furthermore, the ultra-large furnace high furnace temperature uniformity air guide circulation device also includes a hinged expansion mechanism, which is: an inner air guide sleeve 32 is fixedly connected to the lower port of the top air guide hood 3, and the inner edge of the lower port of the top air guide hood 3 is fixedly connected to a hinge sleeve, the hinge sleeve is hinged to the upper hinge chain plate 36, the upper hinge chain plate 36 is hinged to the middle hinge chain plate 37, the middle hinge chain plate 37 is hinged to the lower hinge chain plate 38, and the lower hinge chain plate 38 is hinged to the hinge sleeve fixed to the inner edge of the upper port of the side spray box I7.

[0017] Furthermore, an outer guide sleeve 34 is fixed to the outside of the upper port of the side spray air box I7, and a groove structure is formed around the side spray air box I7. The interior of the groove structure is filled with a fire-resistant sealing and heat-insulating material 33, and the fire-resistant sealing and heat-insulating material 33 is preferably a sealing and heat-insulating felt.

[0018] The invention provides an air circulation device for uniformly guiding and circulating a large furnace with high furnace temperature, which has the following beneficial effects:

[0019] 1. The air guide and spray structure was redesigned, and a sweeping nozzle structure was introduced to solve the problem of reduced uniformity when processing ultra-large aluminum alloy parts, meeting the high furnace temperature uniformity process requirements for the production of large aluminum alloy parts.

[0020] 2. A hinged expansion mechanism is further provided at the reserved expansion interface to prevent deformation and failure of the interface and the escape of high-temperature circulating furnace gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention has the following accompanying drawings:

[0022] Figure 1 Structural diagram A of an air-guiding circulation device for high furnace temperature uniformity in an ultra-large furnace according to the present invention;

[0023] Figure 2 Structural diagram B of an air-guiding circulation device for high furnace temperature uniformity in a super-large furnace according to the present invention;

[0024] Figure 3 Structural diagram C of an air circulation device for high furnace temperature uniformity in a super large furnace of the present invention;

[0025] Figure 4 A front view of an air circulation device for ensuring uniform temperature of a super-large furnace chamber according to the present invention;

[0026] Figure 5 Right view of the air circulation device for high temperature uniformity in a super large furnace according to the present invention;

[0027] Figure 6A top view of an air-guiding circulation device for ensuring uniform temperature of a super-large furnace according to the present invention;

[0028] Figure 7 AA cross-sectional view of an air-guiding circulation device for high furnace temperature uniformity in an ultra-large furnace according to the present invention;

[0029] Figure 8 Cross-sectional view BB of an air-guiding circulation device for high furnace temperature uniformity in an ultra-large furnace according to the present invention;

[0030] Figure 9 Cross-sectional view of CC of an air-guiding circulation device for high furnace temperature uniformity in an ultra-large furnace according to the present invention;

[0031] Figure 10 DD cross-sectional view of an air-guiding circulation device for high furnace temperature uniformity in an ultra-large furnace according to the present invention;

[0032] Figure 11 The present invention shows a sweeping nozzle structure of an air circulation device for high temperature uniformity in an ultra-large furnace;

[0033] Figure 12 Three views of a partial array of sweeping nozzles in an air circulation device for high temperature uniformity in an ultra-large furnace according to the present invention;

[0034] Figure 13 A partial array structure diagram of a sweeping nozzle in a super large furnace with high furnace temperature uniformity air circulation device according to the present invention

[0035] Figure 14 Four cold-state half-section views of a hinged expansion mechanism of an air-guiding circulation device for high-temperature uniformity in an ultra-large furnace according to the present invention;

[0036] Figure 15 A diagram of the cold state at room temperature of a hinged expansion mechanism of an air-guiding circulation device for a super-large furnace with high furnace temperature uniformity according to the present invention;

[0037] Figure 16 Diagram of the high-temperature expansion state of the hinged expansion mechanism of the air-guiding circulation device for a super-large furnace with high furnace temperature uniformity according to the present invention;

[0038] Figure 17 A right-side, half-section view of a hinged expansion mechanism in a high-temperature expansion state of an air-guiding circulation device for an ultra-large furnace with high temperature uniformity according to the present invention;

[0039] In the figure: 1, high-temperature circulation fan; 2, fan volute; 3, top air guide cover; 4, volute air adjustment mechanism; 5, suspension boom; 6, top spray arm; 7, side spray air box I; 8, side spray air window; 9, top spray bracket; 10, side spray air box II; 11, bottom spray air box I; 12, bottom spray air box II; 13, bottom spray air box III; 14, roller through-hole box; 15, air suction baffle; 21, sweeping nozzle; 22, guide frame; 23, top spray arm air outlet; 32, inner air guide sleeve; 33, refractory sealing and thermal insulation material; 34, outer guide sleeve; 36, upper hinged chain plate; 37, middle hinged chain plate; 38, lower hinged chain plate DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings.

[0041] In order to be more economical and efficient, the overall solution heat treatment furnace size of the aluminum alloy parts of large-diameter rockets has been increased to 10 meters long. 7 meters wide It is 7 meters high, and its heat treatment process requires that the high furnace temperature uniformity in the effective heating area remain unchanged at ±3°C.

[0042] With the increased furnace size, the solution heat treatment furnace is divided into three sections: front, middle, and back. Each section is designed with a set of air guide steel structures. Together, these three sets of air guide steel structures form the air circulation system. These air guide steel structures are made of heat-resistant steel plates that are bent and welded.

[0043] Each set of air-guiding steel structure is divided into an upper air-guiding part and a lower air-guiding part.

[0044] The upper air guide part consists of an air suction baffle, a high-temperature circulation fan, a fan volute, a top air guide cover, a heater, a top spray arm, a side spray bellows, and bellows legs.

[0045] The upper air guide part includes a high-temperature circulation fan 1, the fan volute 2 is located outside the high-temperature circulation fan 1, and the air outlet part of the fan volute 2 is connected to the top air guide hood 3, and a heater is installed inside the top air guide hood 3; the air guide hood 3 connected to the fan volute 2 of the high-temperature circulation fan 1 is connected to the side spray air box I7, and the upper part of the side spray air box I7 is connected to the top spray arm 6, and the lower part of the top spray arm 6 is provided with multiple air outlets, and the lower part of the side spray air box I7 is provided with multiple side spray sealing windows 8; after the high-temperature furnace gas is heated by the heater, it passes through the top spray arm 6 and the side spray air box I7 and is sprayed out from the air outlet and the side spray sealing window 8 respectively.

[0046] The lower air guide part consists of an air suction baffle, a high-temperature circulating fan, a fan volute, a top air guide cover, a heater, a side spray air box, a roller through-hole box, and a bottom spray air box.

[0047] The lower air guide part includes a high-temperature circulation fan 1, and the fan volute 2 is located outside the high-temperature circulation fan 1. The air outlet part of the fan volute 2 is connected to the top air guide hood 3, and a heater is installed inside the top air guide hood 3; the air guide hood 3 connected to the fan volute 2 of the high-temperature circulation fan 1 is connected to the side spray air box II10, and the side spray air box II10 is connected to the roller through-hole box 14 below, and the roller through-hole box 14 is connected to the bottom spray air box I11 located at the bottom of the furnace. A plurality of side spray windows 8 are provided at the lower part of the side spray air box II10, and a plurality of shower-type bottom spray nozzles are provided at the upper part of the bottom spray air box I11; after the high-temperature furnace gas is heated by the heater, it passes through the side spray air box II10, the roller through-hole box 14 and the bottom spray air box I11 in sequence and is sprayed out from the side spray windows 8 and the shower-type bottom spray nozzles.

[0048] In the above-mentioned upper air guide part and lower air guide part, the power of the high-temperature circulation fan is 55kW, and the power of the heater in each section is 500kW.

[0049] The high-temperature furnace gas on the left side of the furnace enters the suction port of the high-temperature circulation fan 1 on the left after being pressure-equalized by the left suction baffle 15, and then flows along the fan volute 2 to the top air duct 3 on the left. When the high-temperature furnace gas flows through the heater embedded in the left side of the top air duct 3, it is heated again. The heated high-temperature furnace gas is divided into two paths, one entering the top spray arm 6 and the other entering the side spray box 17. The high-temperature furnace gas entering the top spray arm 6 is sprayed downward into the effective heating area through the air nozzle. The high-temperature furnace gas entering the side spray box 17 is blown to the right into the effective heating area through the side spray window 8.

[0050] The high-temperature furnace gas on the right side of the furnace enters the air intake port of the high-temperature circulation fan 1 on the right side after being pressure-equalized by the right-side air suction baffle 15, and then flows along the fan volute 2 to the top air duct 3 on the right side. When the high-temperature furnace gas flows through the heater embedded in the right side of the top air duct 3, it is heated again. The heated high-temperature furnace gas is divided into two paths, one path enters the side spray air box II10, and the other path enters the roller through-hole box 14 and the bottom spray air box I11. The high-temperature furnace gas entering the side spray air box II10 is blown to the left through the side spray window 8 into the effective heating zone. The high-temperature furnace gas entering the roller through-hole box 14 and the bottom spray air box I11 is sprayed upward into the effective heating zone through the shower-type bottom spray nozzle.

[0051] In order to solve the problem of reduced furnace temperature uniformity caused by the large furnace chamber, a special sweeping nozzle 21 is specially designed for the air outlet of the top spray arm. The upper end interface of the sweeping nozzle 21 is spun into a spherical joint. The joint position of the air outlet of the top spray arm 6 is stamped into a spherical interface 23. The spherical joint of the sweeping nozzle 21 is embedded in the spherical interface 23 of the top spray arm to form a spherical hinged fit. A guide frame 22 is designed under the sweeping nozzle 21. The guide frames 22 of all nozzles are connected into a network, which moves in a circular motion in the horizontal direction under external drive. The guide frame 22 drives the sweeping nozzle 21 to sweep. The high-temperature furnace gas swept out by the nozzle enters the effective heating zone more evenly, so that the effective heating zone achieves a high furnace temperature uniformity of ±3°C.

[0052] In order to solve the problem of bite failure of the expansion interface in the height direction, both the upper and lower air guide parts are provided with a hinged expansion mechanism (such as Figure 10 ).

[0053] An inner air guide sleeve 32 is welded in the lower port of the top air guide cover 3, and a hinge sleeve is welded on the inner edge of the lower port. The hinge sleeve is hinged to the upper hinge chain plate 36.

[0054] The upper hinge chain plate 36 is hinged to the middle hinge chain plate 37. The middle hinge chain plate 37 is hinged to the lower hinge chain plate 38.

[0055] The lower hinged chain plate 38 is hinged to the hinged sleeve welded to the inner edge of the upper port of the side spray box I7.

[0056] The top air guide hood 3 expands downward under the high temperature furnace gas, and the side air box I7 expands upward. The total expansion is about 70mm, which is absorbed by the mutual movement of the hinged chain plates (hinge chain plates 36, 37, 38) in the hinged expansion structure. Figure 17 ), and the deformation direction is constrained by the outer guide sleeve 34 welded to the outside of the upper port of the side nozzle air box I7.

[0057] An outer guide sleeve 34 forms a groove around the side airbox 17. The groove is filled with refractory sealing and thermal insulation material 33 (preferably sealing insulation felt), forming a sealed and insulated structure. This prevents high-temperature furnace gases from escaping during expansion and recovery, minimizing the impact on local temperature uniformity in the furnace.

[0058] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. An air circulation device for high temperature uniformity in a super large furnace, characterized in that: The invention comprises an air guide circulation system composed of a plurality of air guide steel structures, each of which comprises an upper air guide part and a lower air guide part; The upper air guide portion includes a high-temperature circulation fan (1), a fan volute (2) is located outside the high-temperature circulation fan (1), an air outlet portion of the fan volute (2) is connected to a top air guide cover (3), and a heater is installed inside the top air guide cover (3); The air guide cover (3) connected to the fan volute (2) of the high-temperature circulation fan (1) is connected to the side spray box I (7), the upper part of the side spray box I (7) is connected to the top spray arm (6), the lower part of the top spray arm (6) is provided with a plurality of air injection ports, and the lower part of the side spray box I (7) is provided with a plurality of side spray windows (8); after the high-temperature furnace gas is heated by the heater, it passes through the top spray arm (6) and the side spray box I (7) and is ejected from the air injection ports and the side spray windows (8); Each air outlet at the bottom of the top spray arm (6) is movably connected to a sweeping nozzle (21), and a guide device is provided below the sweeping nozzle. The guide device drives all the nozzles (21) to perform circumferential motion in the horizontal direction through an external drive device; The guide device is a guide frame (22) arranged around the sweeping nozzle (21), and the guide frames (22) of all the sweeping nozzles are interconnected to form a mesh structure.

2. The air circulation device for improving the temperature uniformity of a large furnace as claimed in claim 1, characterized in that: The lower air guide portion includes a high-temperature circulation fan (1), a fan volute (2) is located outside the high-temperature circulation fan (1), an air outlet portion of the fan volute (2) is connected to a top air guide cover (3), and a heater is installed inside the top air guide cover (3); The air guide cover (3) connected to the fan volute (2) of the high-temperature circulation fan (1) is connected to the side spray air box II (10), the side spray air box II (10) is connected to the roller rod through-hole box (14) below, the roller rod through-hole box (14) is connected to the bottom spray air box I (11) located at the bottom of the furnace, the side spray air box II (10) is provided with a plurality of side spray air windows (8) at the bottom, and the bottom spray air box I (11) is provided with a plurality of shower-type bottom spray air nozzles at the top; after being heated by the heater, the high-temperature furnace gas passes through the side spray air box II (10), the roller rod through-hole box (14) and the bottom spray air box I (11) in sequence and is ejected from the side spray air windows (8) and the shower-type bottom spray air nozzles.

3. The air circulation device for improving the temperature uniformity of a large furnace as claimed in claim 1, characterized in that: The air jet is a spherical interface (23), the upper end interface of the sweeping nozzle (21) is a spherical joint, and the spherical joint of the sweeping nozzle (21) is embedded in the spherical interface (23) to form a spherical hinged fit.

4. The air circulation device for improving the temperature uniformity of a large furnace as claimed in claim 1, characterized in that: The hinged expansion mechanism further comprises: an inner air guide sleeve (32) fixedly connected to the inner side of the lower port of the top air guide cover (3); a hinge sleeve fixedly connected to the inner side of the lower port of the top air guide cover (3); the hinge sleeve is hinged to the upper hinge chain plate (36); the upper hinge chain plate (36) is hinged to the middle hinge chain plate (37); the middle hinge chain plate (37) is hinged to the lower hinge chain plate (38); and the lower hinge chain plate (38) is hinged to the hinge sleeve fixed to the inner side of the upper port of the side spray air box I (7).

5. The air circulation device for improving the temperature uniformity of a large furnace as claimed in claim 1, characterized in that: An outer guide sleeve (34) is fixed to the outside of the upper port of the side-spraying air box I (7), and a groove-shaped structure is formed around the side-spraying air box I (7), and the interior of the groove-shaped structure is filled with a fire-resistant sealing and heat-insulating material (33).

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