Well type vacuum gas phase infiltration furnace

Abstract

The invention discloses a well type vacuum air phase infiltration furnace which comprises a furnace shell, a muffle tank arranged at the top end of the inner side of the furnace shell, an annular air inlet pipe fixed to the surface of the bottom end of the furnace shell and connected with an air blower, an annular air outlet pipe fixed to the surface of the top end of the furnace shell and a plurality of air outlet adjusting seats fixed to the surface of the annular air outlet pipe. A pull rod movably penetrates through the surfaces of the air outlet adjusting seats, the inner end of the pull rod penetrates through the inner side of the annular air outlet pipe and is fixedly provided with an air exhaust barrel, the inner end of the air exhaust barrel movably penetrates through the inner side of the furnace shell, and an annular seat is fixedly arranged on the surface of each air outlet adjusting seat; according to the well type vacuum air phase infiltration furnace, a clamping type limiting structure is designed on the air outlet adjusting seat, stable clamping limiting can be conducted after the pull rod is pulled, and the position stability after the pull rod and the exhaust cylinder are pulled and adjusted is effectively guaranteed; and the problems of non-uniform cooling effect in the furnace, unstable process parameters and the like caused by re-displacement of the pull rod and the exhaust cylinder are avoided.

Description

Technical Field

[0001] This invention belongs to the field of phase infiltration furnace technology, specifically relating to a well-type vacuum phase infiltration furnace. Background Technology

[0002] In the manufacturing of high-end equipment such as aero-engines, the performance requirements for key components such as aero-engine blades are extremely stringent. To improve their high-temperature resistance and oxidation resistance, vapor phase aluminizing is widely used. Vapor phase aluminizing is a process in which aluminum diffuses and deposits onto the surface of a part in a gaseous form under specific high-temperature conditions, forming an aluminized layer with excellent properties. The pit-type vacuum vapor phase aluminizing furnace, as the core equipment for implementing the vapor phase aluminizing process, directly affects the aluminizing effect and part quality. Currently, traditional pit-type vacuum vapor phase aluminizing furnaces on the market are pit-type furnaces, mainly consisting of a furnace shell, furnace lining, heating elements, muffle furnace, charging rack, vacuum system, hot air circulation and stirring system, inert gas (gas) charging and degassing system, furnace temperature rapid cooling system, ground cooling rack (or pit rack, according to user requirements), automatic control system, temperature control system, electrical control cabinet, and electrical control system, etc. (14 components in total). The furnace is a key component of the gas phase aluminizing furnace. The rapid cooling system plays a crucial role in reducing temperature uniformity within the furnace. For rapid cooling, a traditional well-type vacuum aluminizing furnace has an air inlet pipe surrounding the bottom outer side of the furnace shell, connected to a blower. This continuously blows cold air into the furnace shell. After circulating within the furnace, the cold air is discharged from the annular outlet pipe at the top of the furnace shell, quickly removing heat from the furnace for rapid cooling. Multiple adjustable exhaust ducts are inserted into the annular outlet pipe. By pulling these exhaust ducts, their position within the annular outlet pipe is changed, causing the air outlet holes on the surface of the exhaust ducts to be pulled into the annular outlet pipe, thus allowing for exhaust and rapid removal of heat from the furnace for rapid cooling, meeting the requirements of the gas phase aluminizing process for different parts.

[0003] However, traditional pit-type vacuum gas phase infiltration furnaces have significant defects in their exhaust adjustment structure: although multiple exhaust adjustment seats are provided on the annular exhaust pipe at the top of the furnace shell, and the pull rod of the pull-out exhaust duct is installed through the exhaust adjustment seat, allowing adjustment of the exhaust duct position and exhaust volume by pulling the pull rod, the lack of any limiting structure on the exhaust adjustment seat results in poor limiting of the pull rod and exhaust duct after adjustment. In actual use, the pull rod and exhaust duct are prone to displacement due to fluctuations in the furnace airflow and equipment vibration, making it impossible to guarantee the overall stability of the exhaust volume after adjustment. This affects the cooling effect inside the furnace and may also lead to difficulty in accurately controlling process parameters, increasing the defect rate and production costs. At the same time, the lack of an effective limiting structure also requires operators to repeatedly confirm and adjust the exhaust volume, reducing production efficiency. Therefore, this invention proposes a pit-type vacuum gas phase infiltration furnace. Summary of the Invention

[0004] The purpose of this invention is to provide a well-type vacuum gas infiltration furnace to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a well-type vacuum phase infiltration furnace, comprising a furnace shell, a muffle furnace installed at the top inner side of the furnace shell, an annular air inlet pipe fixed to the bottom surface of the furnace shell and connected to a blower, an annular air outlet pipe fixed to the top surface of the furnace shell, and multiple air outlet regulating seats fixed to the surface of the annular air outlet pipe. A pull rod is movably passed through the surface of each air outlet regulating seat, and the inner end of the pull rod passes through the inner side of the annular air outlet pipe and is fixed to an exhaust duct. The inner end of the exhaust duct movably passes through the inner side of the furnace shell, and the surface of the exhaust duct has multiple air outlet holes. Each of the air outlet holes... The surface of the adjusting seat is fixed with an annular seat, and the pull rod moves through the annular seat. The top of the annular seat has an inner sliding groove, and an inner sliding plate is movably installed in the inner sliding groove. The bottom surface of the inner sliding plate is fixed with a limit block. The front surface of the air outlet adjusting seat has an annular front slot for the bottom end of the limit block to be engaged, and the bottom end of the limit block extends downward through the annular front slot. The rear surface of the exhaust duct has multiple annular rear slots corresponding to the number of air outlet holes. The top surface of the inner sliding plate is fixed with a lifting rod, and the top end of the lifting rod extends through to the top of the annular seat and is fixed with a lifting block.

[0006] Preferably, the inner side of the inner groove is further provided with a spring that abuts against the top of the inner slide plate.

[0007] Preferably, the top surface of the annular seat has a through hole for the lifting rod to pass through, and the through hole communicates with the inner sliding groove.

[0008] Preferably, the inner wall at the bottom end of the inner groove is provided with a bottom hole for the limiting block to pass through.

[0009] Preferably, the front surface of the annular seat is also equipped with a sealing ring, and the inner wall of the sealing ring is provided with two integral annular protrusions that slide in contact with the pull rod.

[0010] Preferably, the sealing ring has multiple integrated side inserts on its side, and the side inserts have integrated side locking blocks on their side. The annular seat has multiple side slots for inserting the side inserts on its side, and the side wall of the side slots has side locking grooves for locking the side locking blocks.

[0011] Preferably, the bottom surface of the annular air inlet pipe is provided with multiple air inlet holes that penetrate through the inner side of the blower.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The well-type vacuum vapor diffusion furnace of this application, through the design of a snap-fit ​​limiting structure on the air outlet regulating seat, can stably snap and limit the position after the pull rod is pulled, effectively ensuring the positional stability of the pull rod and exhaust duct after adjustment. This avoids problems such as uneven cooling effect and unstable process parameters in the furnace caused by the re-displacement of the pull rod and exhaust duct, thereby significantly improving the quality and consistency of vapor phase aluminizing, reducing the defect rate, and saving production costs. At the same time, the snap-fit ​​limiting structure is highly convenient to operate and does not affect the operator's quick pulling of the pull rod during daily use, improving production efficiency. Furthermore, in conjunction with the auxiliary sealing structure, it fully ensures the sealing of the pull rod pulling point, effectively preventing impurities from entering the furnace, further improving the aluminizing effect and part quality, and providing a reliable guarantee for high-quality vapor phase aluminizing of parts such as aero-engine blades. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 For the present invention Figure 1 A magnified view of a portion of region A in the middle;

[0015] Figure 3 This is a side sectional view of the connection between the pull rod and the air outlet adjustment seat of the present invention;

[0016] Figure 4 For the present invention Figure 3 A magnified view of a portion of region B in the middle;

[0017] Figure 5 For the present invention Figure 4 A magnified view of a portion of region C in the middle;

[0018] Figure 6 For the present invention Figure 5 A magnified view of a portion of region D in the middle;

[0019] In the diagram: 1. Furnace shell; 2. Muffle can; 3. Blower; 4. Annular air inlet pipe; 5. Annular air outlet pipe; 6. Air outlet regulating seat; 7. Pull rod; 71. Exhaust duct; 72. Air outlet; 81. Annular seat; 811. Side slot; 812. Side retaining groove; 82. Lifting rod; 83. Lifting block; 84. Inner sliding groove; 85. Spring; 86. Inner sliding plate; 87. Limiting block; 88. Annular front retaining groove; 89. Annular rear retaining groove; 9. Sealing ring; 91. Annular inner protrusion; 92. Side insert block; 93. Side retaining block. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1

[0022] Please see Figures 1 to 5 This is the first embodiment of the present invention, which provides the following technical solution: a well-type vacuum phase infiltration furnace, comprising a furnace shell 1, a muffle tank 2 installed at the top inner side of the furnace shell 1, an annular air inlet pipe 4 welded and fixed to the bottom surface of the furnace shell 1 and connected to a blower 3, an annular air outlet pipe 5 welded and fixed to the top surface of the furnace shell 1, and multiple air outlet adjustment seats 6 welded and fixed to the surface of the annular air outlet pipe 5. A pull rod 7 is movably passed through the surface of the air outlet adjustment seat 6, and the inner end of the pull rod 7 passes through the inner side of the annular air outlet pipe 5 and is fixed to an exhaust duct 71. The inner end of the exhaust duct 71 movably passes through the inner side of the furnace shell 1, and multiple air outlet holes are opened on the surface of the exhaust duct 71. 72. Subsequently, the pull rod 7 can be pulled to move the exhaust duct 71 into the annular air outlet pipe 5, so that the air outlet 72 is located inside the annular air outlet pipe 5. Since the inner end of the exhaust duct 71 is open, the hot air inside the furnace shell 1 can enter the interior of the exhaust duct 71 through the inner end of the exhaust duct 71 and be discharged to the annular air outlet pipe 5 through the air outlet 72. One end of the annular air outlet pipe 5 is connected to the outside, so the hot air discharged into the annular air outlet pipe 5 through the air outlet 72 can be smoothly discharged through the open end of the annular air outlet pipe 5, thereby taking away the heat inside the furnace and playing a role in rapid cooling. The above structure is all existing technology, and the specific structural principle will not be elaborated here.

[0023] Each air outlet regulating seat 6 has an annular seat 81 welded and fixed to its surface, and the pull rod 7 moves through the annular seat 81. The top of the annular seat 81 has an inner groove 84, and an inner slide plate 86 is movably installed in the inner groove 84. The bottom surface of the inner slide plate 86 is welded and fixed with a limit block 87. The front surface of the air outlet regulating seat 6 has an annular front groove 88 for the bottom end of the limit block 87 to be engaged (the annular front groove 88 is used for the stable limiting of the pull rod 7 in the normal state), and the bottom end of the limit block 87 extends downward into the annular front groove 88. The rear surface of the exhaust duct 71 has multiple annular rear grooves 89 corresponding to the number of air outlet holes 72 (the annular rear grooves 89 are used for the stable limiting when the pull rod 7 pulls the exhaust duct 71 into the annular air outlet pipe 5). The top surface of the inner slide plate 86 is fixed. A lifting rod 82 is provided, with its top end extending through to the top of the annular seat 81 and fixed with a lifting block 83. This allows operators to easily pull the lifting rod 82 upwards using the lifting block 83, causing the inner sliding plate 86 to be smoothly pulled up. This, in turn, pulls the bottom end of the limiting block 87 out of the annular front slot 88, quickly releasing the limit on the pull rod 7 and enabling the pull-out operation of the pull rod 7. After the pull-out adjustment of the pull rod 7 and the exhaust duct 71 is completed, simply release the lifting block 83 and the lifting rod 82. Under the push of the spring 85, the inner sliding plate 86, along with the limiting block 87, moves downwards and resets, ultimately causing the bottom end of the limiting block 87 to engage in the annular rear slot 89 in another position. This achieves rapid and stable limiting of the pull rod 7 and the exhaust duct 71, ensuring the stability of the pull rod 7 and the exhaust duct 71 after adjustment and preventing further displacement during subsequent operation.

[0024] In this embodiment, preferably, the inner side of the inner slide groove 84 is also provided with a spring 85 that abuts against the inner slide plate 86 relative to the top of the inner slide plate 86. Under the pushing of the spring 85, the bottom end of the limiting block 87 can be stably locked in the annular rear slot 89 or the annular front slot 88 during daily use. When the operator lifts the lifting rod 82, the inner slide plate 86 moves up and can compress the spring 85.

[0025] In this embodiment, preferably, the top surface of the annular seat 81 is provided with a rod hole through which the lifting rod 82 passes, and the rod hole communicates with the inner sliding groove 84.

[0026] In this embodiment, preferably, the bottom inner wall of the inner groove 84 is provided with a bottom hole through which the limiting block 87 passes.

[0027] In this embodiment, preferably, the bottom surface of the annular air inlet pipe 4 is provided with multiple air inlet holes through the inner side of the blower 3, so that the cold air blown out by the blower 3 can enter the annular air inlet pipe 4 and be blown into the furnace shell 1 through these air inlet holes, thus realizing the entry of cold air.

[0028] Example 2

[0029] Please see Figures 1 to 6 This is the second embodiment of the present invention, which provides the following technical solution: a well-type vacuum phase infiltration furnace, comprising a furnace shell 1, a muffle tank 2 installed at the top inner side of the furnace shell 1, an annular air inlet pipe 4 welded and fixed to the bottom surface of the furnace shell 1 and connected to a blower 3, an annular air outlet pipe 5 welded and fixed to the top surface of the furnace shell 1, and multiple air outlet adjustment seats 6 welded and fixed to the surface of the annular air outlet pipe 5. A pull rod 7 is movably passed through the surface of the air outlet adjustment seat 6, and the inner end of the pull rod 7 passes through the inner side of the annular air outlet pipe 5 and is fixed to an exhaust duct 71. The inner end of the exhaust duct 71 movably passes through the inner side of the furnace shell 1, and multiple air outlet holes are opened on the surface of the exhaust duct 71. 72. Subsequently, the pull rod 7 can be pulled to move the exhaust duct 71 into the annular air outlet pipe 5, so that the air outlet 72 is located inside the annular air outlet pipe 5. Since the inner end of the exhaust duct 71 is open, the hot air inside the furnace shell 1 can enter the interior of the exhaust duct 71 through the inner end of the exhaust duct 71 and be discharged to the annular air outlet pipe 5 through the air outlet 72. One end of the annular air outlet pipe 5 is connected to the outside, so the hot air discharged into the annular air outlet pipe 5 through the air outlet 72 can be smoothly discharged through the open end of the annular air outlet pipe 5, thereby taking away the heat inside the furnace and playing a role in rapid cooling. The above structure is all existing technology, and the specific structural principle will not be elaborated here.

[0030] Each air outlet regulating seat 6 has an annular seat 81 welded and fixed to its surface, and the pull rod 7 moves through the annular seat 81. The top of the annular seat 81 has an inner groove 84, and an inner slide plate 86 is movably installed in the inner groove 84. The bottom surface of the inner slide plate 86 is welded and fixed with a limit block 87. The front surface of the air outlet regulating seat 6 has an annular front groove 88 for the bottom end of the limit block 87 to be engaged (the annular front groove 88 is used for the stable limiting of the pull rod 7 in the normal state), and the bottom end of the limit block 87 extends downward into the annular front groove 88. The rear surface of the exhaust duct 71 has multiple annular rear grooves 89 corresponding to the number of air outlet holes 72 (the annular rear grooves 89 are used for the stable limiting when the pull rod 7 pulls the exhaust duct 71 into the annular air outlet pipe 5). The top surface of the inner slide plate 86 is fixed. A lifting rod 82 is provided, with its top end extending through to the top of the annular seat 81 and fixed with a lifting block 83. This allows operators to easily pull the lifting rod 82 upwards using the lifting block 83, causing the inner sliding plate 86 to be smoothly pulled up. This, in turn, pulls the bottom end of the limiting block 87 out of the annular front slot 88, quickly releasing the limit on the pull rod 7 and enabling the pull-out operation of the pull rod 7. After the pull-out adjustment of the pull rod 7 and the exhaust duct 71 is completed, simply release the lifting block 83 and the lifting rod 82. Under the push of the spring 85, the inner sliding plate 86, along with the limiting block 87, moves downwards and resets, ultimately causing the bottom end of the limiting block 87 to engage in the annular rear slot 89 in another position. This achieves rapid and stable limiting of the pull rod 7 and the exhaust duct 71, ensuring the stability of the pull rod 7 and the exhaust duct 71 after adjustment and preventing further displacement during subsequent operation.

[0031] In this embodiment, preferably, the inner side of the inner slide groove 84 is also provided with a spring 85 that abuts against the inner slide plate 86 relative to the top of the inner slide plate 86. Under the pushing of the spring 85, the bottom end of the limiting block 87 can be stably locked in the annular rear slot 89 or the annular front slot 88 during daily use. When the operator lifts the lifting rod 82, the inner slide plate 86 moves up and can compress the spring 85.

[0032] In this embodiment, preferably, the top surface of the annular seat 81 is provided with a rod hole through which the lifting rod 82 passes, and the rod hole communicates with the inner sliding groove 84.

[0033] In this embodiment, preferably, the bottom inner wall of the inner groove 84 is provided with a bottom hole through which the limiting block 87 passes.

[0034] In this embodiment, preferably, a sealing ring 9 is also installed on the front surface of the annular seat 81, and the inner wall of the sealing ring 9 is provided with two integral annular protrusions 91 that slide in contact with the pull rod 7, which can improve the sealing performance at the connection between the pull rod 7 and the annular seat 81.

[0035] In this embodiment, preferably, the side of the sealing ring 9 is provided with a plurality of integrated side insert blocks 92, and the side of the side insert block 92 is provided with an integrated side locking block 93. The side of the annular seat 81 is provided with a plurality of side slots 811 for the side insert blocks 92 to be inserted, and the side wall of the side slot 811 is provided with a side locking groove 812 for the side locking block 93 to be engaged, so that the sealing ring 9 can be stably installed on the side of the annular seat 81, ensuring the installation stability of the sealing ring 9. The sealing ring 9, the annular inner protrusion 91, the side insert block 92 and the side locking block 93 are all made of fluororubber, which will undergo elastic deformation when squeezed and has good heat resistance.

[0036] In this embodiment, preferably, the bottom surface of the annular air inlet pipe 4 is provided with multiple air inlet holes through the inner side of the blower 3, so that the cold air blown out by the blower 3 can enter the annular air inlet pipe 4 and be blown into the furnace shell 1 through these air inlet holes, thus realizing the entry of cold air.

[0037] Although embodiments of the invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A well-type vacuum phase infiltration furnace, comprising a furnace shell (1), a muffle tank (2) installed at the top of the inner side of the furnace shell (1), an annular air inlet pipe (4) fixed to the bottom surface of the furnace shell (1) and connected to a blower (3), an annular air outlet pipe (5) fixed to the top surface of the furnace shell (1), and a plurality of air outlet adjustment seats (6) fixed to the surface of the annular air outlet pipe (5), wherein a pull rod (7) is movably passed through the surface of the air outlet adjustment seat (6), and the inner end of the pull rod (7) passes through the inner side of the annular air outlet pipe (5) and is fixed with an exhaust duct (71), the inner end of the exhaust duct (71) movably passes through the inner side of the furnace shell (1), and a plurality of air outlet holes (72) are opened on the surface of the exhaust duct (71), characterized in that: Each of the air outlet adjustment seats (6) has an annular seat (81) fixed on its surface, and a pull rod (7) moves through the annular seat (81). The top of the annular seat (81) has an inner groove (84) inside, and an inner slide plate (86) is movably installed in the inner groove (84). The bottom surface of the inner slide plate (86) is fixed with a limiting block (87). The front surface of the air outlet adjustment seat (6) has an annular front groove (88) for the bottom end of the limiting block (87) to be inserted, and the bottom end of the limiting block (87) extends downward into the annular front groove (88). The rear surface of the exhaust duct (71) has multiple annular rear grooves (89) corresponding to the number of air outlet holes (72). The top surface of the inner slide plate (86) is fixed with a lifting rod (82), and the top end of the lifting rod (82) extends through to the top of the annular seat (81) and is fixed with a lifting block (83).

2. The well-type vacuum gas infiltration furnace according to claim 1, characterized in that: The inner side of the inner slide groove (84) is also provided with a spring (85) that abuts against the top of the inner slide plate (86) relative to the inner slide plate (86).

3. A well-type vacuum gas infiltration furnace according to claim 1, characterized in that: The top surface of the annular seat (81) is provided with a rod hole for the lifting rod (82) to pass through, and the rod hole is connected to the inner sliding groove (84).

4. A well-type vacuum gas infiltration furnace according to claim 1, characterized in that: The inner wall of the bottom end of the inner groove (84) is provided with a bottom hole through which the limiting block (87) passes.

5. A well-type vacuum gas infiltration furnace according to claim 1, characterized in that: The front surface of the annular seat (81) is also equipped with a sealing ring (9), and the inner wall of the sealing ring (9) is provided with two integral annular inner protrusions (91) that slide in contact with the pull rod (7).

6. A well-type vacuum gas infiltration furnace according to claim 5, characterized in that: The sealing ring (9) has multiple integrated side inserts (92) on its side, and the side inserts (92) has an integrated side locking block (93) on its side. The annular seat (81) has multiple side slots (811) for the side inserts (92) to be inserted, and the side wall of the side slots (811) has a side groove (812) for the side locking block (93) to be engaged.

7. A well-type vacuum gas infiltration furnace according to claim 1, characterized in that: The bottom surface of the annular air inlet pipe (4) is provided with multiple air inlet holes that penetrate through the inner side of the blower (3).

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