A vacuum heating furnace with high sealing performance

Abstract

The present invention discloses a vacuum heating furnace with high sealing performance, including a furnace body, which adopts a double-layer high-temperature resistant metal shell structure, with the interlayer filled with thermal insulation material. The top of the furnace body is connected to the furnace cover via a detachable flange structure, and the top of the furnace cover is fixed with a cover plate by bolts. Vertical heating electrode columns are symmetrically arranged on both sides of the inner cavity of the furnace body, and the surface of the heating electrode columns is treated with multi-layer metal plating. The top wall of the furnace cover is provided with a through-hole for the outer side of the heating electrode column to pass through. The through-hole is in the shape of a hollow truncated cone with a wide top and a narrow bottom, and the inner wall is smooth. A sealing ring is mounted on the sealing ring through-hole, and the sealing ring is made of a high-temperature resistant elastic composite material. A sealing cylinder matching the shape of the through-hole is extended from the bottom. This invention forms three sealing barriers through the cooperation of the first sealing sleeve, the second sealing sleeve, and the third sealing sleeve, thereby improving the sealing reliability and reducing the vacuum leakage rate in a high-temperature environment compared with the traditional structure.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum heating furnace and terminal pole sealing thereof, in particular to a vacuum heating furnace with high sealing performance. Background Art

[0002] In modern industrial production, vacuum heating furnaces are key equipment for metal heat treatment, and their sealing performance directly affects the heat treatment quality of workpieces. In the existing technology, the sealing structure between the heating electrode column and the furnace body generally has the following defects: First, a single sealing material is used, which is prone to thermal aging in a high-temperature environment, resulting in a decrease in the elasticity of the seal; second, the sealing structure is mostly a simple extrusion fit, which cannot adapt to the thermal expansion and contraction effects caused by temperature changes, thereby producing tiny gaps; third, there is a lack of precise positioning mechanism during the installation process, which easily causes uneven force on the seal, resulting in local leakage, seriously affecting the working vacuum degree of the vacuum furnace. In addition, the existing sealing structure requires the entire furnace cover to be disassembled for maintenance, which is cumbersome and time-consuming. When the seal is aged or damaged, it is often necessary to stop the machine for several hours for replacement, which greatly reduces production efficiency. Therefore, it is necessary to develop a vacuum heating furnace with high sealing performance. Summary of the Invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid blurring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0005] A vacuum heating furnace with high sealing performance, comprising:

[0006] The furnace body adopts a double-layer high-temperature resistant metal shell structure, the interlayer is filled with thermal insulation material, the top of the furnace body is connected to the furnace cover via a detachable flange structure, the top of the furnace cover is fixed with a cover plate by bolts, vertical heating electrode columns are symmetrically arranged on both sides of the inner cavity of the furnace body, the surface of the heating electrode columns is treated with multi-layer metal plating, and the top wall of the furnace cover is provided with a through-hole for the outer side of the heating electrode column to pass through. The through-hole is in the shape of a hollow frustum that is wide at the top and narrow at the bottom, and the inner wall is smooth;

[0007] A sealing ring is sleeved on the perforation. The sealing ring is made of a high-temperature resistant elastic composite material. A sealing cylinder matching the shape of the perforation is extended from the bottom. The sealing cylinder forms an interference fit with the perforation. An annular first sealing sleeve is embedded on the inner side of the sealing ring. The first sealing sleeve adopts a composite structure of a metal skeleton and high-temperature resistant rubber and fits tightly with the outer side of the heating electrode column. A plurality of slots are opened on the outer edge of the top of the sealing ring at equal intervals around the ring center.

[0008] A mounting cavity, wherein a circular mounting cavity is provided inside the cover plate directly above the through hole, and a pressing and fixing assembly is provided in the inner cavity of the mounting cavity. The assembly includes a gear transmission mechanism and a linkage clamping mechanism for circumferential positioning and axial compression of the sealing ring;

[0009] Mounting hole, the inner cavity of the cover plate is located above the mounting cavity and is provided with a circular mounting hole, the inner side of the mounting hole is screwed with a fixing sleeve, the fixing sleeve is annular and the rod body of the heating electrode column passes through it, the inner side of the fixing sleeve is embedded with a third sealing sleeve, and the middle part of the outer side of the fixing sleeve is embedded with a second sealing sleeve, the second sealing sleeve is made of multiple layers of high-temperature resistant fiber woven material, and is interference fit with the inner side of the mounting hole to form a composite sealing structure.

[0010] As a preferred solution of a vacuum heating furnace with high sealing performance described in the present invention, the gear transmission mechanism of the downward pressing and fixing assembly includes a gear ring rotatably arranged on the bottom wall of the inner cavity of the installation cavity, and the linkage clamping mechanism includes a plurality of evenly distributed blocks, the heating electrode column and the sealing ring are located at the inner center of the gear ring, each block is rotatably connected to the bottom wall of the installation cavity through a mounting frame, and one end of the block can be clamped into the corresponding slot to fix the sealing ring.

[0011] As a preferred solution of the vacuum heating furnace with high sealing performance described in the present invention, a horizontal marking line 1 is provided on the upper surface of the fixed sleeve, and a longitudinal marking line 2 is provided on the outer side of the heating electrode column.

[0012] As a preferred solution of the vacuum heating furnace with high sealing performance described in the present invention, when the marking line 1 and the marking line 2 are aligned, the card block is aligned with the card slot.

[0013] As a preferred solution of a vacuum heating furnace with high sealing performance described in the present invention, the other side of each of the clamping blocks is connected to a telescopic rod through a movable hinge, the other end of the telescopic rod is rotatably connected to the lifting block, and a vertical screw is rotatably provided on the bottom wall of the inner cavity of the installation cavity near each lifting block. The screw and the lifting block form a threaded transmission pair, and the lower end of each screw is provided with a follower gear that meshes with the outer teeth of the gear ring to form a linkage transmission structure.

[0014] As a preferred solution of a vacuum heating furnace with high sealing performance described in the present invention, a vertical driving rod is rotatably provided on the bottom wall of the inner cavity of the installation cavity, the upper end of the driving rod extends to the outside of the cover plate and is provided with a knob for easy operation, and the lower end is provided with a driving gear meshing with the outer teeth of the gear ring, and all the blocks can be synchronously driven to move by the rotation of the driving rod.

[0015] As a preferred solution of the vacuum heating furnace with high sealing performance described in the present invention, the outer side of the fixed sleeve is provided with an external thread below the second sealing sleeve, and the inner side of the mounting hole is provided with an internal thread adapted to the external thread.

[0016] As a preferred solution of the vacuum heating furnace with high sealing performance described in the present invention, the outer side of the fixed sleeve is provided with anti-slip grooves, which adopt a mesh-shaped raised structure, are located above the second sealing sleeve and exposed to the top of the cover plate.

[0017] As a preferred solution of the vacuum heating furnace with high sealing performance described in the present invention, the centers of the heating electrode column, through hole, sealing ring, sealing cylinder, gear ring, mounting hole and fixing sleeve are on the same vertical axis.

[0018] As a preferred solution of the vacuum heating furnace with high sealing performance described in the present invention, one end of the clamping block is set as a wedge-shaped end, and the wedge-shaped end is in contact with the inner wall of the clamping groove to apply downward pressing force to the sealing ring.

[0019] The beneficial effects of the present invention are:

[0020] 1. Through the cooperation of the first sealing sleeve, the second sealing sleeve and the third sealing sleeve, three sealing barriers are formed, which significantly improves the sealing reliability and reduces the vacuum leakage rate in high temperature environment compared with the traditional structure.

[0021] 2. Through marking alignment and gear linkage mechanism, accurate installation of sealing components is achieved, avoiding sealing failure caused by human operation errors and improving installation efficiency.

[0022] 3. With modular design, when the seal needs to be replaced, only the fixed sleeve and cover need to be removed without removing the entire furnace cover, thus shortening maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. Among them:

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 This is a schematic structural diagram of a cross section of a cover plate according to the present invention;

[0026] Figure 3 For the present invention Figure 2 Schematic diagram of the structure of area A;

[0027] Figure 4 For the present invention Figure 2 Schematic diagram of the structure after the middle fixed sleeve is disassembled;

[0028] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of area B in the middle;

[0029] Figure 6 This is a structural schematic diagram of the pressing and fixing assembly of the present invention;

[0030] Figure 7 For the present invention Figure 4 Schematic diagram of the structure after the middle sealing ring is disassembled;

[0031] Figure 8 For the present invention Figure 7 Schematic diagram of the structure of the middle C area;

[0032] Figure 9 This is a schematic structural diagram of the sealing collar, the sealing cylinder and the first sealing sleeve cross section of the present invention;

[0033] Figure 10 For the present invention Figure 7 Structural diagram of the middle cover plate cross section;

[0034] Figure 11 For the present invention Figure 10 Schematic diagram of the structure of region D in the middle.

[0035] In the figure: furnace body 100, furnace cover 110, cover plate 120, heating electrode column 130, through-hole 140, sealing ring 200, sealing cylinder 210, first sealing sleeve 220, card slot 230, mounting cavity 300, gear ring 310, mounting frame 320, card block 330, screw 340, lifting block 350, telescopic rod 360, follower gear 370, drive rod 380, driving gear 390, mounting hole 400, fixing sleeve 410, external thread 420, second sealing sleeve 430, third sealing sleeve 440, anti-slip groove 450, internal thread 460. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0039] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0040] See also Figures 1-11 , shows a schematic diagram of the structure of a vacuum heating furnace with high sealing performance according to the present invention, please refer to Figures 1-11 , a vacuum heating furnace with high sealing performance is introduced in detail.

[0041] A vacuum heating furnace with high sealing performance includes a furnace body 100. The furnace body 100 adopts a double-layer high-temperature resistant metal shell structure with an insulating material filled in the interlayer. The top of the furnace body 100 is connected to a furnace cover 110 via a detachable flange structure. The top of the furnace cover 110 is fixed with a cover plate 120 by bolts. Vertical heating electrode columns 130 are symmetrically arranged on both sides of the inner cavity of the furnace body 100. The surfaces of the heating electrode columns 130 are treated with multi-layer metal plating. The top wall of the furnace cover 110 is provided with a through-hole 140 for the outside of the heating electrode column 130 to pass through. The through-hole 140 is in the shape of a hollow truncated cone with a wide top and a narrow bottom and a smooth inner wall. The heating electrode column 130 is made of high-purity copper, and the surface is plated with a nickel layer, a silver layer and a high-temperature resistant ceramic layer in sequence. The multi-layer plating structure can not only improve the electrical conductivity, but also enhance the antioxidant ability and adapt to high-temperature vacuum environment.

[0042] The perforation 140 is covered with a sealing ring 200, which is made of a high-temperature resistant elastic composite material. A sealing cylinder 210 matching the shape of the perforation 140 is extended from the bottom. The sealing cylinder 210 forms an interference fit with the perforation 140. An annular first sealing sleeve 220 is embedded inside the sealing ring 200. The first sealing sleeve 220 adopts a composite structure of a metal skeleton and high-temperature resistant rubber and fits tightly with the outer side of the heating electrode column 130. A plurality of slots 230 are formed on the outer edge of the top of the sealing ring 200 with the ring center as the center and at equal intervals.

[0043] A circular mounting cavity 300 is provided inside the cover plate 120, directly above the through-hole 140. A pressing and fixing assembly is provided in the mounting cavity 300. The assembly includes a gear transmission mechanism and a linkage clamping mechanism for circumferentially positioning and axially pressing the sealing collar 200.

[0044] The inner cavity of the cover plate 120 is located above the mounting cavity 300 and is provided with a circular mounting hole 400. A fixing sleeve 410 is screwed onto the inner side of the mounting hole 400. The fixing sleeve 410 is annular and the shaft of the heating electrode column 130 passes through it. A third sealing sleeve 440 is embedded on the inner side of the fixing sleeve 410, and a second sealing sleeve 430 is embedded in the middle part of the outer side of the fixing sleeve 410. The second sealing sleeve 430 is made of multiple layers of high-temperature resistant fiber woven material and is interference fit with the inner side of the mounting hole 400 to form a composite sealing structure.

[0045] Among them, the gear transmission mechanism of the downward pressing and fixing assembly includes a gear ring 310 rotatably arranged on the bottom wall of the inner cavity 300, and the linked clamping mechanism includes a plurality of evenly distributed clamping blocks 330. The heating electrode column 130 and the sealing ring 200 are located at the inner center of the gear ring 310. Each clamping block 330 is rotatably connected to the bottom wall of the mounting cavity 300 through the mounting frame 320. One end of the clamping block 330 can be clamped into the corresponding clamping groove 230 to fix the sealing ring 200.

[0046] Among them, the upper surface of the fixed sleeve 410 is provided with a horizontal marking line 1, and the outer side of the heating electrode column 130 is provided with a longitudinal marking line 2. When the marking line 1 and the marking line 2 are aligned, the block 330 is aligned with the slot 230, and one end of the block 330 is set as a wedge-shaped end, and the wedge-shaped end is in contact with the inner wall of the slot 230 to apply a downward pressing force to the sealing ring 200.

[0047] The other side of each clamping block 330 is connected to a telescopic rod 360 via a movable hinge. The other end of the telescopic rod 360 is rotatably connected to the lifting block 350. A vertical screw 340 is rotatably installed on the bottom wall of the inner cavity of the installation cavity 300 near each lifting block 350. The screw 340 and the lifting block 350 form a threaded transmission pair. The lower end of each screw 340 is provided with a follower gear 370 that meshes with the external teeth of the ring gear 310, forming a linked transmission structure. A vertical drive rod 380 is rotatably installed on the bottom wall of the inner cavity of the installation cavity 300. The upper end of the drive rod 380 extends to the outside of the cover plate 120 and is equipped with a knob for easy operation. The lower end is provided with a driving gear 390 that meshes with the external teeth of the ring gear 310. The rotation of the drive rod 380 can synchronously drive the movement of all clamping blocks 330.

[0048] Among them, the outer side of the fixed sleeve 410 is located below the second sealing sleeve 430 and is provided with an external thread 420, the inner side of the mounting hole 400 is provided with an internal thread 460 adapted to the external thread 420, and the outer side of the fixed sleeve 410 is provided with an anti-slip pattern 450, and the anti-slip pattern 450 adopts a mesh raised structure, is located above the second sealing sleeve 430 and is exposed to the top of the cover plate 120.

[0049] The heating electrode column 130 , the through hole 140 , the sealing ring 200 , the sealing cylinder 210 , the gear ring 310 , the mounting hole 400 and the center of the fixing sleeve 410 are shown.

[0050] When installing the sealing collar 200, first place it over the heating electrode column 130, aligning the sealing sleeve 210 with the through-hole 140. Because the sealing sleeve 210 and through-hole 140 both have tapered fittings, they naturally align under the action of gravity. Now, observe the first marking on the fixed sleeve 410 and the second marking on the heating electrode column 130. Slightly rotate the sealing collar 200 to align the two sets of markings, ensuring that the positions of the retaining groove 230 and the retaining block 330 are aligned.

[0051] Once the markings are aligned, the operator turns the knob on top of the drive rod 380 clockwise. This rotates the driving gear 390, which then meshes with the ring gear 310, causing the ring gear 310 to move in a circular motion. The follower gear 370 on the outside of the ring gear 310 rotates accordingly, driving the screw 340. Because the screw 340 is threadedly connected to the lifting block 350, the rotation of the screw 340 translates into axial upward motion of the lifting block 350. The lifting block 350, via the telescopic rod 360, pushes the clamping block 330 to rotate about the pin of the mounting bracket 320. The wedge-shaped end of the clamping block 330 gradually engages the retaining groove 230, exerting a downward pressure on the sealing ring 200, forcing the sealing sleeve 210 to fit tightly against the inner wall of the perforation 140. Simultaneously, the first sealing sleeve 220 is squeezed and deformed, filling the gap between the sealing ring 200 and the heating electrode column 130, forming a primary seal.

[0052] After the downward pressure is complete, the fixing sleeve 410 is placed over the heating electrode column 130, so that the external threads 420 of the fixing sleeve 410 engage with the internal threads 460 of the mounting hole 400. The operator twists the fixing sleeve 410 clockwise using the anti-slip grooves 450. As the threads engage, the fixing sleeve 410 moves downward, and the second sealing sleeve 430 is squeezed between the outer side of the fixing sleeve 410 and the inner side of the mounting hole 400, forming a radial seal. Simultaneously, the third sealing sleeve 440 is squeezed between the inner side of the fixing sleeve 410 and the outer side of the heating electrode column 130, forming an axial seal. Because the third sealing sleeve 440 utilizes a metal bellows structure, it has excellent elastic compensation capabilities and can accommodate slight deformation of the heating electrode column 130 at high temperatures.

[0053] When the seal needs to be replaced, simply twist the fixing sleeve 410 counterclockwise to remove it from the mounting hole 400, then rotate the drive rod 380 counterclockwise to disengage the locking block 330 from the locking groove 230, and the sealing collar 200 can be removed from the heating electrode column 130. The entire maintenance process does not require disassembly of the furnace cover 110, allowing for quick seal replacement, significantly improving maintenance efficiency compared to traditional structures.

[0054] Furthermore, an explanation of the innovative points and outstanding substantive technical effects of this solution is provided.

[0055] Innovation of the solution

[0056] 1. Multi-layer composite sealing structure design

[0057] The first sealing sleeve 220 is embedded inside the sealing ring 200 and adopts a composite structure of a metal skeleton and high-temperature resistant rubber. It fits tightly with the outer side of the heating electrode column 130 to form a first sealing barrier.

[0058] A second sealing sleeve 430 is embedded in the middle of the outer side of the fixing sleeve 410. The second sealing sleeve 430 is made of multiple layers of high-temperature resistant fiber braided material and has an interference fit with the inner side of the mounting hole 400 to form a second sealing barrier.

[0059] A third sealing sleeve 440 is embedded inside the fixed sleeve 410 to form a third sealing barrier. The three sealing barriers cooperate with each other to significantly improve the sealing reliability.

[0060] 2. Gear transmission linkage clamping mechanism

[0061] The downward pressure fixing assembly includes a gear transmission mechanism and a linkage clamping mechanism. When the drive rod 380 rotates, the driving gear 390 drives the ring gear 310 to rotate, and the driven gear 370 drives the screw 340 to rotate, causing the lifting block 350 to move axially. The telescopic rod 360 pushes the clamping block 330 into the clamping groove 230 to achieve circumferential positioning and axial compression of the sealing ring 200, ensuring uniform force on the seal.

[0062] 3. Marking alignment precise positioning mechanism

[0063] A first horizontal marking is set on the upper surface of the fixing sleeve 410, and a second vertical marking is set on the outer side of the heating electrode column 130. When the two are aligned, the clamping block 330 and the clamping slot 230 are precisely aligned, avoiding sealing failure due to installation error and achieving precise positioning during the installation process.

[0064] 4. Modular and detachable structure design

[0065] The sealing ring 200, the fixing sleeve 410 and other components adopt a modular design. During maintenance, only the fixing sleeve 410 and the cover plate 120 need to be removed without removing the entire furnace cover 110, which greatly simplifies the maintenance process.

[0066] Outstanding substantive technical effects

[0067] 1. Sealing performance is significantly improved

[0068] The three sealing barriers work together to effectively prevent gas leakage in high temperature environments, and the vacuum leakage rate is reduced by about 65% compared with traditional structures. The leakage rate of traditional structures is usually , the present invention can be reduced to The following ensures high vacuum in the furnace to meet the requirements of precision heat treatment process.

[0069] 2. Installation efficiency is greatly improved

[0070] The marking alignment mechanism and gear linkage mechanism enable fast and accurate installation, and the operation can be completed by one person. The installation time is shortened from 60 minutes of the traditional structure to 25 minutes, improving efficiency by about 140%, reducing equipment debugging time and improving production efficiency.

[0071] 3. Significant improvement in maintenance convenience

[0072] The modular design allows seal replacement without removing the furnace cover 110, shortening maintenance time from 120 minutes of the traditional structure to 30 minutes, a reduction of 75%, reducing downtime, improving equipment utilization, and reducing maintenance costs.

[0073] Specifically, data comparison of relevant tests and actual applications of this solution.

[0074]

[0075] Data Description

[0076] The vacuum leakage rate test was carried out in a high temperature environment of 1000℃. The leakage rate data of the structure of the present invention was stable at About, which is significantly lower than the traditional structure.

[0077] The installation time test is the time it takes for a single person to complete the installation of the entire sealing assembly. The present invention reduces the alignment and adjustment time through the marking line alignment and gear linkage mechanism.

[0078] The maintenance time test is the time to replace the sealing ring 200 and the first sealing sleeve 220. The modular design of the present invention does not require the furnace cover 110 to be disassembled, and the replacement can be completed by directly disassembling the fixing sleeve 410 and the cover plate 120.

[0079] Data Validity Description

[0080] All experimental equipment has been calibrated, the testers have professional qualifications, the testing process strictly follows the relevant standards, and the data is true and reliable.

[0081] Each set of tests was repeated 5 times, and the average value was taken as the final result to reduce accidental errors and ensure the accuracy and repeatability of the data.

[0082] The experimental conditions are consistent with the actual production environment and can truly reflect the performance of the equipment in actual use. The data is of guiding significance for actual production.

[0083] Notes:

[0084] High-temperature-resistant metal shell: The furnace body utilizes a double-layer, high-temperature-resistant metal shell. Considering its need to withstand the high temperatures within the furnace and serve as structural support, the metal material selected is a nickel-based high-temperature alloy (such as Inconel 600). The corresponding high-temperature range is 600°C-1000°C, maintaining structural stability and mechanical properties in long-term high-temperature environments, meeting the operating temperature requirements of the vacuum heating furnace.

[0085] High-temperature-resistant elastic composite material: The sealing ring is made of a high-temperature-resistant elastic composite material that must possess both elasticity and heat resistance to ensure sealing effectiveness at high temperatures. This material is a glass fiber-reinforced silicone rubber composite material with a high-temperature range of -60°C to 260°C. It maintains excellent elasticity and sealing properties in high-temperature environments and adapts to the operating temperature fluctuations of vacuum heating furnaces.

[0086] High-temperature resistant rubber composite material: The first sealing sleeve adopts a composite structure of metal skeleton and high-temperature resistant rubber. The rubber part needs to fit tightly to the heating electrode column and will not age excessively or attenuate its elasticity at high temperatures.

[0087] The high temperature resistant rubber selected is fluororubber, which has a corresponding high temperature range of -20℃-200℃. It has excellent high temperature resistance and aging resistance, and can ensure the long-term effective sealing of the first sealing sleeve.

[0088] High-temperature-resistant fiber braid material: The second sealing sleeve is made of multiple layers of high-temperature-resistant fiber braid material. It seals the fixed sleeve and the mounting hole, requiring it to withstand high temperatures and provide excellent sealing performance. This basalt fiber braid has a high-temperature range of -260°C to 700°C and offers high strength, high-temperature resistance, and corrosion resistance, effectively fulfilling the function of a second sealing barrier.

[0089] Specific application examples of this solution

[0090] Example 1: Vacuum heat treatment of titanium alloy parts in the aerospace field

[0091] 1. Application Scenarios

[0092] In the aerospace industry, titanium alloy components such as engine blades and fuselage frames require extremely high mechanical properties and surface quality after heat treatment. The sealing performance of the vacuum heating furnace directly affects the heat treatment quality of titanium alloy components. If the seal is poor and air infiltrates, it will cause oxidation of the titanium alloy surface, reducing the strength and corrosion resistance of the component.

[0093] 2. Equipment structure application

[0094] Furnace body 100 utilizes a double-layer, high-temperature-resistant metal shell structure with an interlayer filled with insulation material to ensure stable temperature within the furnace and minimize heat loss. A removable flange connects to the top of furnace body 100, which is attached to a cover plate 120, facilitating installation and maintenance of the sealing assembly.

[0095] Heating electrode columns 130 are symmetrically positioned on either side of the furnace body 100's interior. Their surfaces feature a multi-layer metal coating to enhance conductivity and oxidation resistance. A through-hole 140 is defined in the top wall of the furnace cover 110. The through-hole 140 is shaped like a hollow truncated cone, wide at the top and narrow at the bottom. Its inner wall is smooth, housing a sealing collar 200. A sealing sleeve 210 at the bottom provides an interference fit within the through-hole 140.

[0096] The mounting cavity 300 within the cover plate 120 houses a downward-pressing assembly, which positions and compresses the sealing collar 200 via a gear transmission mechanism and a linked clamping mechanism. A fixing sleeve 410 is threaded onto the inside of the mounting hole 400, while a second sealing sleeve 430 is embedded on the outside and a third sealing sleeve 440 is embedded on the inside, forming a composite sealing structure.

[0097] 3. Specific operation process

[0098] During installation, put the sealing ring 200 on the heating electrode column 130, align the sealing tube 210 with the through hole 140, observe the mark 1 on the fixed sleeve 410 and the mark 2 on the heating electrode column 130, adjust the position of the sealing ring 200 to align them, and ensure that the slot 230 is aligned with the block 330.

[0099] Turn the knob on the top of the drive rod 380 clockwise, and the drive rod 380 drives the driving gear 390 to rotate, which in turn rotates the ring gear 310. The follower gear 370 drives the screw 340 to rotate, causing the lifting block 350 to rise axially. The telescopic rod 360 pushes the clamping block 330 into the clamping groove 230, applying downward pressure to the sealing ring 200, so that the sealing cylinder 210 is tightly fitted against the inner wall of the through-hole 140. The first sealing sleeve 220 fills the gap to form a primary seal.

[0100] The fixing sleeve 410 is put on the heating electrode column 130, and the external thread 420 is engaged with the internal thread 460 of the mounting hole 400. The fixing sleeve 410 is screwed clockwise, and the second sealing sleeve 430 is squeezed to form a radial seal, and the third sealing sleeve 440 is squeezed to form an axial seal to adapt to the high-temperature deformation of the heating electrode column 130.

[0101] Example 2: Vacuum sintering of ceramic substrates in the field of electronic components

[0102] 1. Application Scenarios

[0103] In the electronic component industry, ceramic substrates are a key material for integrated circuit packaging. Their vacuum sintering process places stringent demands on the vacuum level and temperature uniformity within the furnace. A poorly sealed vacuum furnace can allow impurities to penetrate the ceramic substrate during sintering, affecting its insulation and thermal conductivity, and reducing the reliability of the electronic component.

[0104] 2. Equipment structure application

[0105] The double-layer structure and thermal insulation material of the furnace body 100 ensure temperature uniformity within the furnace, and the temperature fluctuation range is controlled within ±5°C. The sealing structure of the furnace cover 110 and the cover plate 120 ensures stable vacuum and prevents outside air and impurities from entering the furnace.

[0106] The heating electrode column 130 is made of high-purity copper with multiple layers of metal plating, providing excellent conductivity and uniform heating, providing a stable heat source for sintering the ceramic substrate. The design of the perforation 140 and sealing ring 200 ensures a tight seal at the penetration of the heating electrode column 130.

[0107] The sealing structure of the pressing down fixing assembly and the fixing sleeve 410 forms three sealing barriers, effectively preventing gas leakage and meeting the high vacuum requirement of vacuum sintering of ceramic substrates.

[0108] 3. Specific operation process

[0109] Before installing the sealing assembly, clean the furnace body 100 and all components to prevent impurities from affecting the sealing effect. Slide the sealing ring 200 onto the heating electrode column 130, aligning it with the through hole 140 and using the markings to ensure accurate installation.

[0110] Operate the drive rod 380 to engage the clamping block 330 with the clamping groove 230, compressing the sealing ring 200 to form a primary seal. When installing the fixed sleeve 410, pay attention to the position of the anti-slip groove 450 to facilitate the twisting operation and ensure that the second sealing sleeve 430 and the third sealing sleeve 440 are properly squeezed to form a composite seal.

[0111] During the sintering process, the vacuum and temperature in the furnace are monitored in real time, and the vacuum is maintained at After that, the temperature is evenly increased according to the set curve to ensure the sintering quality of the ceramic substrate.

[0112] Example 3: Vacuum Quenching of Aluminum Alloy Wheels in the Automotive Parts Field

[0113] 1. Application Scenarios

[0114] In the automotive industry, vacuum quenching of aluminum alloy wheels aims to improve their strength and toughness, ensuring driving safety. The sealing performance of the vacuum heating furnace directly affects the mechanical properties of the aluminum alloy wheel after quenching. If the seal fails, the wheel surface will oxidize, reducing hardness and wear resistance.

[0115] 2. Equipment structure application

[0116] The double-layer structure and thermal insulation of furnace body 100 effectively maintain the temperature within the furnace, meeting the rapid temperature rise requirements for aluminum alloy wheel quenching. The sealed structure of furnace cover 110 and cover plate 120 ensures a stable vacuum and prevents air from entering during the quenching process.

[0117] The multi-layer metal coating treatment on the heating electrode column 130 enhances its oxidation resistance, ensuring stable operation at high temperatures and providing a reliable heat source for heating the aluminum alloy wheel hub. The sealing structure of the sealing ring 200, the fixed sleeve 410, and other components forms a three-layer sealing barrier, ensuring a high vacuum within the furnace.

[0118] The gear transmission mechanism and linkage clamping mechanism of the downward pressure fixing component realize the fast and accurate installation of the sealing component, and the marking alignment mechanism ensures the accurate installation position to avoid seal failure.

[0119] 3. Specific operation process

[0120] When installing the sealing assembly, strictly follow the marking alignment requirements to ensure that the block 330 is aligned with the slot 230 , and the sealing ring 200 is pressed by rotating the driving rod 380 to ensure that the sealing cylinder 210 is tightly fitted with the through hole 140 .

[0121] The fixing sleeve 410 is installed by meshing the external thread 420 and the internal thread 460 . When tightening, pay attention to applying uniform force to ensure that the second sealing sleeve 430 and the third sealing sleeve 440 form a good sealing effect.

[0122] After the aluminum alloy wheel hub is placed in the furnace, it is vacuumed to the set value and quenched at a high temperature according to the process requirements. During the quenching process, the vacuum degree and temperature are monitored in real time to ensure the quenching quality.

[0123] Although the present invention has been described above with reference to embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as there are no structural conflicts, the various features of the embodiments disclosed herein may be combined with each other in any manner, and the omission of an exhaustive description of such combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A vacuum heating furnace with high sealing performance, characterized in that: include: A furnace body (100), wherein the furnace body (100) adopts a double-layer high-temperature resistant metal shell structure, the interlayer is filled with heat-insulating material, the top of the furnace body (100) is connected to a furnace cover (110) via a detachable flange structure, the top of the furnace cover (110) is fixed with a cover plate (120) via bolts, vertical heating electrode columns (130) are symmetrically arranged on both sides of the inner cavity of the furnace body (100), the surface of the heating electrode columns (130) is treated with multi-layer metal plating, and the top wall of the furnace cover (110) is provided with a through hole (140) for the outer side of the heating electrode column (130) to pass through, and the through hole (140) is in the shape of a hollow truncated cone with a wide top and a narrow bottom, and the inner wall thereof is smooth; A sealing ring (200), wherein the perforation (140) is provided with a sealing ring (200), the sealing ring (200) is made of a high-temperature resistant elastic composite material, and a sealing cylinder (210) is provided at the bottom thereof, the sealing cylinder (210) and the perforation (140) forming an interference fit, an annular first sealing sleeve (220) is embedded in the inner side of the sealing ring (200), the first sealing sleeve (220) adopts a composite structure of a metal skeleton and high-temperature resistant rubber, and is closely fitted with the outer side of the heating electrode column (130), and a plurality of slots (230) are provided on the outer edge of the top of the sealing ring (200) at equal intervals around the center of the ring; A mounting cavity (300), wherein a circular mounting cavity (300) is provided inside the cover plate (120) and located directly above the through hole (140), and a downward pressing fixing assembly is provided in the inner cavity of the mounting cavity (300), wherein the downward pressing fixing assembly includes a gear transmission mechanism and a linkage clamping mechanism, and is used for circumferential positioning and axial pressing of the sealing ring (200); A mounting hole (400), wherein the inner cavity of the cover plate (120) is located above the mounting cavity (300) and is provided with a circular mounting hole (400), a fixing sleeve (410) is screwed on the inner side of the mounting hole (400), the fixing sleeve (410) is annular and the shaft of the heating electrode column (130) passes through it, a third sealing sleeve (440) is embedded on the inner side of the fixing sleeve (410), and a second sealing sleeve (430) is embedded in the middle part of the outer side of the fixing sleeve (410), the second sealing sleeve (430) is made of multiple layers of high-temperature resistant fiber braided material, and is interference-fitted with the inner side of the mounting hole (400) to form a composite sealing structure; The gear transmission mechanism of the downward pressing and fixing assembly includes a gear ring (310) rotatably arranged on the bottom wall of the inner cavity of the installation cavity (300), and the linkage clamping mechanism includes a plurality of evenly distributed clamping blocks (330). The heating electrode column (130) and the sealing ring (200) are located at the inner center of the gear ring (310). Each clamping block (330) is rotatably connected to the bottom wall of the installation cavity (300) through the mounting frame (320). One end of the clamping block (330) can be clamped into the corresponding clamping groove (230) to achieve fixation of the sealing ring (200); The other side of each of the clamping blocks (330) is connected to a telescopic rod (360) via a movable hinge, and the other end of the telescopic rod (360) is rotatably connected to the lifting block (350). A vertical screw (340) is rotatably provided on the bottom wall of the inner cavity of the installation cavity (300) near each lifting block (350). The screw (340) and the lifting block (350) form a threaded transmission pair, and the lower end of each of the screws (340) is provided with a follower gear (370) that meshes with the outer teeth of the gear ring (310), forming a linkage transmission structure. A vertical driving rod (380) is rotatably provided on the bottom wall of the inner cavity of the installation cavity (300). The upper end of the driving rod (380) extends to the outside of the cover plate (120) and is provided with a knob for easy operation. The lower end is provided with a driving gear (390) that meshes with the outer teeth of the gear ring (310). The rotation of the driving rod (380) can synchronously drive all the blocks (330) to move.

2. The vacuum heating furnace with high sealing performance according to claim 1, characterized in that: A first transverse marking line is provided on the upper surface of the fixed sleeve (410), and a second longitudinal marking line is provided on the outer side of the heating electrode column (130).

3. The vacuum heating furnace with high sealing performance according to claim 2, characterized in that: When the marking line 1 and the marking line 2 are aligned, the clamping block (330) is aligned with the clamping slot (230).

4. The vacuum heating furnace with high sealing performance according to claim 1, characterized in that: An external thread (420) is provided on the outer side of the fixing sleeve (410) below the second sealing sleeve (430), and an internal thread (460) adapted to the external thread (420) is provided on the inner side of the mounting hole (400).

5. The vacuum heating furnace with high sealing performance according to claim 1, characterized in that: The outer side of the fixed sleeve (410) is provided with an anti-slip pattern (450), the anti-slip pattern (450) adopts a mesh-shaped raised structure, is located above the second sealing sleeve (430) and is exposed on the top of the cover plate (120).

6. The vacuum heating furnace with high sealing performance according to claim 1, characterized in that: The centers of the heating electrode column (130), the through hole (140), the sealing collar (200), the sealing cylinder (210), the gear ring (310), the mounting hole (400), and the fixing sleeve (410) are all located on the same vertical axis.

7. The vacuum heating furnace with high sealing performance according to claim 1, characterized in that: One end of the clamping block (330) is configured as a wedge-shaped end, and the wedge-shaped end is in contact with the inner wall of the clamping groove (230) and is used to apply a downward pressing force to the sealing ring (200).

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