Heating can and three-chamber continuous vacuum heat treatment furnace

Abstract

The application relates to a heating furnace tube and a three-chamber continuous vacuum heat treatment furnace. The heating furnace tube comprises a furnace body, a furnace bed, four groups of supporting components and four groups of heating components. The furnace body comprises four furnace walls arranged in a ring shape. The furnace bed is arranged in the furnace body. The supporting components are fixed to the four furnace walls respectively. The heating components are fixed to the supporting components respectively to form four heating sub-zones. Each group of the heating components comprises two heating bands. The heating band comprises an input section, an output section and a heating section connecting the input section and the output section. The input sections of the two heating bands are overlapped with each other. The output sections of the two heating bands are overlapped with each other. The heating sections of the two heating bands are symmetrically arranged and are respectively laid in half of the heating sub-zone. The four heating sub-zones provide omnidirectional heat radiation. The symmetrically arranged heating sections of the heating bands make the heating bands more evenly spread in the whole heating sub-zone. The heating temperature of the whole heating sub-zone is more uniform, and the overall temperature uniformity in the furnace is improved.

Description

Technical Field

[0001] This invention relates to the field of vacuum heat treatment technology, and in particular to a heating furnace chamber and a three-chamber continuous vacuum heat treatment furnace. Background Technology

[0002] With the development of vacuum heat treatment technology, vacuum heat treatment furnaces, which achieve oxidation-free and decarburization-free heat treatment processes in a vacuum environment, are widely used in the heat treatment of materials. Currently, vacuum heat treatment furnaces generally adopt a circular furnace chamber structure. The traditional circular three-temperature zone heating structure layout leads to uneven heat radiation distribution, easily forming temperature gradients within the furnace. This results in poor heat uniformity of the workpiece, easily generating thermal stress, affecting the heat treatment quality, and failing to meet the requirements of gradient heating or zoned constant temperature in complex processes. Summary of the Invention

[0003] Therefore, it is necessary to provide a heating furnace chamber and a three-chamber continuous vacuum heat treatment furnace to address the problem of uneven temperature inside existing vacuum heat treatment furnaces.

[0004] On one hand, this application provides a heating furnace liner, comprising: a furnace body, the furnace body including four furnace walls arranged around it; a furnace bed, the furnace bed being disposed within the furnace body; four sets of support components, the support components being fixedly disposed on the four furnace walls respectively; and four sets of heating components, the heating components being fixedly disposed on the support components to form four heating zones, each set of heating components including two heating strips, each heating strip including an input section, an output section and a heating section connecting the input section and the output section, the input sections of the two heating strips being stacked on top of each other, the output sections of the two heating strips being stacked on top of each other, the heating sections of the two heating strips being symmetrically arranged and respectively laid in half of the heating zone.

[0005] In one embodiment, the heating segment includes a straight segment and a serpentine segment, the straight segment extending straight from a first end of the heating segment, and the serpentine segment extending zigzagly from the straight segment to a second end of the heating segment, the first end being connected to one of the input segment and the output segment, and the second end being connected to the other of the input segment and the output segment.

[0006] In one embodiment, the support assembly includes a plurality of ceramic supports respectively fixed to the furnace wall, and the heating belt is fixed to the ceramic supports.

[0007] In one embodiment, the support assembly further includes a fixing wire, the ceramic support has a U-shaped groove and a wire hole, the heating band is disposed in the U-shaped groove, and the fixing wire passes through the wire hole to fix the heating band.

[0008] In one embodiment, the support assembly further includes a plurality of fixing bolts, a plurality of fixing nuts, and a plurality of ceramic plates. The fixing bolts pass through the ceramic support and the furnace wall, and the fixing nuts are screwed to the fixing bolts to fix the ceramic support to the furnace wall. The ceramic plates are disposed between the heating belt and the fixing bolts.

[0009] In one embodiment, the support assembly further includes a ceramic sheet disposed between the heating band and the fixing bolt.

[0010] In one embodiment, the furnace body includes multiple insulation layers and multiple spacers, the spacers being disposed at intervals between the insulation layers.

[0011] In one embodiment, the spacing between two adjacent insulation layers is at least 7 mm.

[0012] In one embodiment, the plurality of insulation layers are heat-resistant layers or corrosion-resistant layers, and the heat-resistant layers and the corrosion-resistant layers are arranged from the inside of the furnace body to the outside.

[0013] In one embodiment, the spacer is a U-shaped spacer bar, and the furnace body also includes a fixing screw and a matching nut. The fixing screw passes through the heat insulation layer and the U-shaped spacer bar, and the matching nut is screwed to the fixing screw to fix the heat insulation layer and the U-shaped spacer bar.

[0014] On the other hand, this application provides a three-chamber continuous vacuum heat treatment furnace, comprising: a heat treatment furnace body having a loading chamber, a heat treatment chamber, and a unloading chamber arranged sequentially, the heat treatment chamber having a loading port communicating with the loading chamber and a unloading port communicating with the unloading chamber; a heating furnace liner as described above, the heating furnace liner being disposed in the heat treatment chamber and respectively connected to the loading port and the unloading port; and an automatic loading and unloading device, the automatic loading and unloading device being respectively disposed in the loading chamber and the unloading chamber.

[0015] In summary, the heating furnace of this application, through its furnace body structure with four surrounding walls forming four directions, and each wall equipped with heating components, can form four independent heating zones, providing all-around heat radiation. This effectively eliminates the temperature gradient caused by traditional single-sided heating and improves the overall temperature uniformity within the furnace. Each heating zone can be individually temperature-controlled, meeting the needs of complex processes for gradient heating or zoned constant temperature, ensuring more uniform heating of the workpiece and reducing thermal stress. Furthermore, each heating zone has two heating bands. By stacking the input and output sections of the heating bands and symmetrically arranging the heating sections, both the input and output sections are located in the center of the heating zone. This allows for a more rational and even distribution of the heating bands, resulting in a more uniform heating temperature throughout the entire zone. The structure of the heating zone is also more aesthetically pleasing, and the heating power of the two heating bands can be matched to ensure more uniform heating temperatures. Attached Figure Description

[0016] Figure 1 A perspective view of a heating furnace liner provided for one embodiment of this application;

[0017] Figure 2 A schematic diagram of temperature zones in the heating furnace chamber according to the above embodiments of this application is shown;

[0018] Figure 3 A cross-sectional schematic diagram of a heating furnace liner according to the above embodiments of this application is shown;

[0019] Figure 4 A perspective view of the heating belt of the furnace chamber according to the above embodiment of this application is shown;

[0020] Figure 5 A plan view of the heating belt of the furnace chamber according to the above embodiment of this application is shown;

[0021] Figure 6 As shown Figure 2 A magnified schematic diagram of part A of the heating furnace chamber;

[0022] Figure 7 A cross-sectional schematic diagram of a three-chamber continuous vacuum heat treatment furnace provided for one embodiment of this application.

[0023] Reference numerals: 100, Heating furnace chamber; 10, Furnace body; 11, Insulation layer; 12, Spacer; 13, Fixing screw; 14, Matching nut; 20, Furnace bed; 30, Support assembly; 31, Ceramic support component; 311, U-shaped groove; 312, Wire hole; 32, Fixing thread; 33, Fixing bolt; 34, Fixing nut; 35, Ceramic sheet; 40, Heating assembly; 41, Heating belt; 411, Input section; 412, Output section; 413, Heating section; 4131, Straight section; 4132, Serpentine section; 4133, First end; 4134, Second end; 50, Heating zone; 200, Heat treatment furnace body; 210, Feeding chamber; 220, Heat treatment chamber; 230, Discharging chamber; 240, Feeding port; 250, Discharging port; 300, Automatic loading and unloading device. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] To address the problem of uneven temperature inside existing vacuum heat treatment furnaces, this application provides a heating furnace chamber and a three-chamber continuous vacuum heat treatment furnace, which can provide four independent heating zones to ensure more uniform heating of the workpiece.

[0031] Specifically, please refer to Figure 1 , Figure 2 and Figure 3On the one hand, this application provides a heating furnace 100, which may include a furnace body 10, a furnace bed 20, four sets of support assemblies 30, and four sets of heating assemblies 40. The furnace body 10 includes four furnace walls arranged around it, and the furnace bed 20 is disposed inside the furnace body 10 for placing workpieces to be heat-treated. The support assemblies 30 are respectively fixed to the four furnace walls, and the heating assemblies 40 are respectively fixed to the support assemblies 30 to form four heating zones 50. Each set of heating assemblies 40 includes two heating bands 41, each heating band 41 including an input section 411, an output section 412, and a heating section 413 connecting the input section 411 and the output section 412. The input section 411 and the output section 412 are respectively connected to a power source, and the heating section 413 can generate heat when current is applied. The input segments 411 of the two heating bands 41 are stacked on top of each other, the output segments 412 of the two heating bands 41 are stacked on top of each other, and the heating segments 413 of the two heating bands 41 are arranged symmetrically and laid in half of the heating zone 50 respectively.

[0032] It is understood that the heating furnace 100 of this application, through the furnace body 10 structure formed by four furnace walls arranged in a circumferential direction, with heating components 40 on each furnace wall, can form four independent heating zones 50, providing all-round heat radiation, effectively eliminating the temperature gradient caused by traditional single-sided heating, and improving the overall temperature uniformity inside the furnace. Each heating zone 50 can be individually temperature controlled, which can meet the needs of gradient heating or zoned constant temperature in complex processes, ensuring more uniform heating of the workpiece and reducing thermal stress. Furthermore, each heating zone 50 is provided with two heating bands 41. By stacking the input segment 411 and the output segment 412 of the heating band 41 respectively, and symmetrically arranging the heating segment 413 of the heating band 41, the input segment 411 and the output segment 412 of the heating band 41 are both located in the middle of the heating zone 50. The heating bands 41 can be arranged more reasonably and more evenly to cover the entire heating zone 50. The heating temperature of the entire heating zone 50 is more uniform, the structure of the heating zone 50 is more aesthetically pleasing, and it can also match the heating power of the two heating bands 41, so that the heating temperature of the two heating bands 41 is more uniform.

[0033] Alternatively, in some embodiments, such as Figure 3 , Figure 4 and Figure 5The illustration shows an example of the arrangement of the heating section 413 of a heating band 41 according to this application. The heating section 413 includes a straight segment 4131 and a serpentine segment 4132. The straight segment 4131 extends straight from the first end 4133 of the heating section 413, and the serpentine segment 4132 extends bently from the straight segment 4131 to the second end 4134 of the heating section 413. The first end 4133 is connected to one of the input segment 411 and the output segment 412, and the second end 4134 is connected to the other of the input segment 411 and the output segment 412. In this way, the serpentine segment 4132 can more comprehensively cover the heating zone 50, and the straight segment 4131 can connect the end of the serpentine segment 4132 furthest from the input segment 411 or the output segment 412 to the middle of the heating zone 50, satisfying the layout design where the input segment 411 and the output segment 412 are located in the middle of the heating zone 50, making the distribution of the heating band 41 more uniform.

[0034] Optionally, in some embodiments, the heating band 41 can be made of nickel-chromium alloy. Nickel-chromium alloy has the characteristics of high resistivity, strong oxidation resistance and high temperature resistance. Heating band 41 made of nickel-chromium alloy has higher stability and longer service life. Heating band 41 can maintain continuous and stable heating in high temperature environment, so that the heating temperature of the entire heating zone 50 is more uniform.

[0035] Optionally, since both the heating band 41 and the furnace body 10 are typically metal structures, and the heating band 41 requires an electric current, to avoid the risk of a short circuit, such as Figure 2 and Figure 6 As shown, in some embodiments, the support assembly 30 includes multiple ceramic supports 31, which are respectively fixed to the furnace wall, and the heating band 41 is fixed to the ceramic supports 31. On the one hand, the ceramic supports 31 have excellent insulation properties, which can separate the heating band 41 from the furnace wall and avoid the risk of short circuit caused by the heating band 41 contacting the furnace wall; on the other hand, the ceramic supports 31 have high temperature resistance and are not prone to deformation when exposed to high temperature for a long time, which can reduce safety hazards during heat treatment.

[0036] Optionally, such as Figure 6 As shown, in some embodiments, the support assembly 30 further includes a fixing wire 32. The ceramic support member 31 has a U-shaped groove 311 and a wire hole 312. The heating belt 41 is disposed in the U-shaped groove 311, and the fixing wire 32 passes through the wire hole 312 to fix the heating belt 41. In this way, the U-shaped groove 311 can position the heating belt 41, and with the fixing wire 32 binding the heating belt 41, the heating belt 41 can be more firmly fixed to the ceramic support member 31.

[0037] Optionally, in some embodiments, the material of the fixing wire 32 can be a nickel-chromium alloy. The fixing wire 32 made of nickel-chromium alloy can still maintain high structural strength at high temperature, and its high temperature creep resistance is better than that of ordinary metals, which can avoid relaxation or breakage caused by thermal stress.

[0038] Optionally, such as Figure 6 As shown, in some embodiments, the support assembly 30 further includes a plurality of fixing bolts 33 and a plurality of fixing nuts 34. The fixing bolts 33 pass through the ceramic support 31 and the furnace wall, and the fixing nuts 34 are screwed to the fixing bolts 33 to fix the ceramic support 31 to the furnace wall.

[0039] Optionally, such as Figure 6 As shown, in some embodiments, the support assembly 30 further includes a ceramic plate 35, which is disposed between the heating band 41 and the fixing bolt 33 for fixing. Thus, when the fixing bolt 33 and the fixing nut 34 fail to engage, the ceramic plate 35 separates the fixing bolt 33 from the heating band 41, preventing the fixing bolt 33 from slipping and contacting the heating band 41, avoiding short circuits, and improving the safety performance of the heating furnace 100.

[0040] Optionally, such as Figure 6 As shown, in some embodiments, the furnace body 10 includes multiple insulation layers 11 and multiple spacers 12, with the spacers 12 spaced apart between the insulation layers 11. This spaced arrangement of the insulation layers 11 increases thermal resistance, reduces heat conduction, and utilizes the air gaps between each insulation layer 11 to suppress convective heat loss, thereby improving the insulation effect of the furnace body 10.

[0041] Optionally, in some embodiments, the heat insulation layer 11 is a metal reflector, which can reflect heat radiation back into the furnace body 10, further improving the heat preservation effect of the furnace body 10.

[0042] Optionally, since the overall thermal resistance of the insulation layer 11 is related to the spacing between each insulation layer 11, the larger the spacing between each insulation layer 11, the greater the overall thermal resistance of the insulation layer 11. Therefore, in some embodiments, the spacing between two adjacent insulation layers 11 is at least 7 mm. In this way, by controlling the spacing between two adjacent insulation layers 11 to be greater than 7 mm, the overall thermal resistance of multiple insulation layers 11 can be improved, thereby giving the furnace body 10 a better heat preservation effect.

[0043] Optionally, in some embodiments, the plurality of insulation layers 11 are either heat-resistant layers or corrosion-resistant layers, and the heat-resistant layers and corrosion-resistant layers are arranged from the inside to the outside of the furnace body 10. The heat-resistant layer has high high-temperature resistance and oxidation resistance, and can directly face the high-temperature area to reduce heat radiation to the outside. The corrosion-resistant layer has good corrosion resistance, can be used in humid or corrosive gas environments, and can also assist in heat insulation.

[0044] In one embodiment, for example, the furnace body 10 includes five insulation layers 11, each spaced 7 mm apart. The two inner insulation layers 11 are made of 310S stainless steel, which, due to its excellent high-temperature resistance and oxidation resistance, can withstand temperatures up to 1150°C. The three outer insulation layers 11 are made of 316L stainless steel, which, due to its excellent corrosion resistance, can be used in humid or corrosive gas environments.

[0045] Optionally, such as Figure 6 As shown, in some embodiments, the spacer 12 is a U-shaped spacer bar. The furnace body 10 also includes a fixing screw 13 and a matching nut 14. The fixing screw 13 passes through the insulation layer 11 and the U-shaped spacer bar, and the matching nut 14 is screwed and fixed to the fixing screw 13 to fix the insulation layer 11 and the U-shaped spacer bar. In this way, the fixing screw 13 and the fixing nut 34 lock the insulation layer 11 and the U-shaped spacer bar together, which can achieve multi-layer positioning and fixing. The U-shaped structure of the U-shaped spacer bar can evenly distribute the tightening force of the fixing screw 13 onto the insulation layer 11, avoiding deformation of the insulation layer 11 caused by local stress concentration.

[0046] On the other hand, such as Figure 7 As shown, this application also provides a three-chamber continuous vacuum heat treatment furnace, which may include a furnace body 200 and a heating furnace chamber 100 as described above. The furnace body 200 has a loading chamber 210, a heat treatment chamber 220, and a unloading chamber 230 arranged sequentially. The heat treatment chamber 220 has a loading port 240 communicating with the loading chamber 210 and a unloading port 250 communicating with the unloading chamber 230. The heating furnace chamber 100 is disposed in the heat treatment chamber 220 and is connected to the loading port 240 and the unloading port 250, respectively. An automatic loading and unloading device 300 is disposed in the loading chamber 210 and the unloading chamber 230, respectively, for automatic loading and unloading. In this way, the four furnace walls surrounding the heating furnace chamber 100 can form a through-flow design structure. The three-chamber continuous vacuum heat treatment furnace utilizes the through-flow design structure of the heating furnace chamber 100 to realize the loading and unloading method of front loading and rear unloading. With the automatic loading and unloading device 300 located in the loading chamber 210 and unloading chamber 230, continuous and uninterrupted production can be achieved, with high heat treatment efficiency.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A heating furnace liner, characterized in that, include: The furnace body includes four furnace walls arranged around it; A furnace bed, wherein the furnace bed is disposed within the furnace body; Four sets of support components, each of which is fixedly mounted on one of the four furnace walls; as well as Four sets of heating components are fixed to the support component to form four heating zones. Each set of heating components includes two heating strips. Each heating strip includes an input section, an output section, and a heating section connecting the input section and the output section. The input sections of the two heating strips are stacked on top of each other, and the output sections of the two heating strips are stacked on top of each other. The heating sections of the two heating strips are arranged symmetrically and are laid in half of the heating zone. The heating section includes a straight segment and a serpentine segment. The straight segment extends straight from a first end of the heating section, and the serpentine segment extends zigzagly from the straight segment to a second end of the heating section. The first end is connected to one of the input segment and the output segment, and the second end is connected to the other of the input segment and the output segment.

2. The heating furnace liner according to claim 1, characterized in that, The support assembly includes multiple ceramic support members respectively fixed to the furnace wall, and the heating belt is fixed to the ceramic support members.

3. The heating furnace liner according to claim 2, characterized in that, The support assembly also includes a fixing wire. The ceramic support has a U-shaped groove and a wire hole. The heating band is disposed in the U-shaped groove, and the fixing wire passes through the wire hole to fix the heating band.

4. The heating furnace liner according to claim 3, characterized in that, The support assembly also includes multiple fixing bolts, multiple fixing nuts, and multiple ceramic plates. The fixing bolts pass through the ceramic support and the furnace wall, and the fixing nuts are screwed to the fixing bolts to fix the ceramic support to the furnace wall. The ceramic plates are disposed between the heating belt and the fixing bolts.

5. The heating furnace liner according to any one of claims 1 to 4, characterized in that, The furnace body includes multiple insulation layers and multiple spacers, which are respectively and spaced apart between the insulation layers.

6. The heating furnace liner according to claim 5, characterized in that, The spacing between two adjacent insulation layers is at least 7 mm.

7. The heating furnace liner according to claim 5, characterized in that, The multiple insulation layers are either heat-resistant layers or corrosion-resistant layers, and the heat-resistant layers and the corrosion-resistant layers are arranged from the inside of the furnace body to the outside.

8. The heating furnace liner according to claim 5, characterized in that, The spacer is a U-shaped spacer bar. The furnace body also includes a fixing screw and a matching nut. The fixing screw passes through the heat insulation layer and the U-shaped spacer bar, and the matching nut is screwed to the fixing screw to fix the heat insulation layer and the U-shaped spacer bar.

9. A three-chamber continuous vacuum heat treatment furnace, characterized in that, include: The heat treatment furnace body has a feeding chamber, a heat treatment chamber and a discharging chamber arranged in sequence. The heat treatment chamber has a feeding port communicating with the feeding chamber and a discharging port communicating with the discharging chamber. The heating furnace liner as described in any one of claims 1 to 8, wherein the heating furnace liner is disposed in the heat treatment chamber and is respectively connected to the loading port and the unloading port; and An automatic loading and unloading device is respectively installed in the loading chamber and the unloading chamber.

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