Kiln with uniform temperature

Abstract

The invention discloses a furnace with uniform temperature, which comprises a furnace body, a furnace cover, a heating device, a heating device and a temperature control device, wherein a hearth for accommodating a material to be processed is formed in the furnace body; the heating piece is arranged in the hearth; wherein the hearth comprises a plurality of heating areas, each heating area comprises a plurality of heating pieces, a first gap is formed between the adjacent heating pieces corresponding to the same heating area, a second gap is formed between the adjacent heating pieces corresponding to different heating areas, and the second gap is larger than the first gap. The gap difference is formed between the same heating area and different heating areas, so that the temperature field in the hearth is distributed in a balanced manner, and the temperature in the kiln is effectively and uniformly controlled.

Description

Technical Field

[0001] This application relates to the field of kiln technology, and in particular to a kiln with uniform temperature. Background Technology

[0002] As heat treatment, sintering and other processes place higher demands on product consistency and energy consumption, electric kilns need to maintain uniform furnace temperature under different loading and process curves.

[0003] Due to differences in heat dissipation along the height of the furnace sidewalls, convection paths, and loading obstruction, the furnace chamber often experiences insufficient heating in the lower section and heat accumulation in the middle and upper-middle sections. This leads to temperature differences between the upper and lower sections and localized hot spots, which in turn cause problems such as product performance fluctuations, deformation and cracking, and increased energy consumption. Therefore, there is an urgent need for a kiln that can structurally match the differences in heat demand along the height and improve temperature uniformity. Summary of the Invention

[0004] This application provides a kiln with uniform temperature to solve the problems of large temperature differences and local overheating inside the kiln.

[0005] The technical solution adopted in this application is as follows:

[0006] This application provides a kiln with uniform temperature, comprising:

[0007] The furnace body has an internal chamber for holding the materials to be processed.

[0008] Heating elements are installed inside the furnace chamber;

[0009] The furnace chamber includes multiple heating zones, each heating zone includes multiple heating elements, a first gap is formed between adjacent heating elements in the same heating zone, and a second gap is formed between adjacent heating elements in different heating zones, the second gap being larger than the first gap.

[0010] This application sets gaps of different sizes between the same heating zone and different heating zones to make the heat transfer and airflow distribution between the heating zones more balanced, thereby reducing the temperature difference between different areas in the furnace, avoiding local overheating, and improving the uniformity of the overall temperature field of the kiln and the consistency of processing quality.

[0011] In one alternative implementation, the heating element is a heating rod extending in a horizontal direction, and both the second gap and the first gap extend in a horizontal direction.

[0012] In one alternative implementation, the uppermost heating rod has a third gap between it and the top of the furnace.

[0013] In one alternative implementation, the third gap is larger than the second gap.

[0014] In one alternative implementation, multiple second gaps are located on the same sidewall of the furnace, and the widths of the multiple second gaps on the same sidewall of the furnace decrease from top to bottom.

[0015] In one alternative implementation, the furnace body includes a furnace door and a furnace body, with an opening on one side of the furnace body, and the furnace door cover having an opening that, together with the furnace body, forms the furnace chamber;

[0016] Both the furnace door and the furnace body are provided with a second gap, and the second gap of the furnace door is smaller than the second gap of the furnace body.

[0017] In one alternative implementation, the furnace body includes a bottom plate disposed opposite to the furnace door, and a side plate connecting the bottom plate and the furnace door;

[0018] Both the side plates and the bottom plate are provided with a second gap, and the second gap of the bottom plate is larger than the second gap of the side plate.

[0019] In one alternative implementation, both the furnace door and the furnace body are provided with a first gap, and the first gap of the furnace door is smaller than the first gap of the furnace body.

[0020] In one alternative implementation, the kiln further includes an air inlet assembly for introducing inert gas into the furnace chamber, the air inlet of which is located at the bottom of the furnace chamber.

[0021] In one alternative implementation, the kiln further includes an extraction assembly for extracting gas from the furnace chamber, wherein the extraction port of the extraction assembly is configured to correspond to the second gap.

[0022] Based on the implementation methods provided in the above aspects, this application can be further combined to provide more implementation methods.

[0023] Other advantages, objectives and features of this application will be partly apparent from the description below, and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of a kiln in related technologies;

[0026] Figure 2 This is a schematic cross-sectional view of the kiln provided in the embodiments of this application;

[0027] Figure 3 This is a front view of the furnace door provided in an embodiment of this application;

[0028] Figure 4 This is a cross-sectional structural diagram of the furnace door provided in an embodiment of this application;

[0029] Figure 5 This is a cross-sectional structural diagram of the furnace body provided in an embodiment of this application.

[0030] Explanation of icon numbers:

[0031] 10. Furnace body; 11. Furnace chamber; 12. Heating zone; 13. Furnace door; 14. Furnace body; 141. Bottom plate; 142. Side plate; 20. Heating element; 30. First gap; 40. Second gap; 50. Third gap. Detailed Implementation

[0032] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0033] The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. In this application, "at least one" means one or more, and "more than one" means two or more. The terms "first," "second," and other ordinal terms used in this application may be used to describe various constituent elements, but these constituent elements are not limited by these terms. The purpose of using these terms is solely to distinguish one constituent element from others and should not be construed as indicating or implying relative importance. For example, without departing from the scope of this application, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element.

[0034] Each component may be described or referred to as "used for" performing one or more tasks. In this context, "used for" is used to imply a structure by indicating that the component includes a structure that performs one or more tasks during operation. Therefore, even when a specified component is currently inoperable (e.g., not turned on), it can still be referred to as "used for performing that task." Components used with the term "used for" include hardware.

[0035] Before introducing the embodiments of this application, the relevant technologies involved in this application will be introduced first.

[0036] Please refer to Figure 1As shown, in existing technologies, to control and maintain the temperature of a cavity (or heated space), a common approach is to arrange heating elements on the sidewalls. Specifically, this often involves multiple layers of heating elements arranged at equal intervals along the height of the sidewall, creating a vertically distributed heat source that provides continuous heat input to the medium or heated object within the cavity and forms a basic temperature field coverage. However, in actual operation, this type of equally spaced multi-layered arrangement is affected by factors such as structural boundaries, heat conduction paths, and differences in convection conditions. This can lead to localized heat accumulation, inconsistent temperature rise at different heights, and consequently, uneven temperature distribution or localized overheating.

[0037] refer to Figure 2 As shown, the kiln with uniform temperature provided in this application includes:

[0038] The furnace body 10 has an internal furnace chamber 11 for holding the materials to be processed;

[0039] Heating element 20 is disposed inside furnace chamber 11;

[0040] The furnace chamber 11 includes multiple heating zones 12, each heating zone 12 includes multiple heating elements 20, a first gap 30 is formed between adjacent heating elements 20 corresponding to the same heating zone 12, and a second gap 40 is formed between adjacent heating elements 20 corresponding to different heating zones 12, the second gap 40 being larger than the first gap 30.

[0041] Specifically, the kiln with uniform temperature forms a furnace chamber 11 inside the furnace body 10 for accommodating the materials to be processed, and several heating elements 20 are arranged within the furnace chamber 11. The furnace chamber 11 is functionally divided into multiple heating zones 12 along its length or height, and multiple heating elements 20 are arranged in each heating zone 12. For the same heating zone 12, the first gap 30 reserved between adjacent heating elements 20 is relatively small; while between adjacent heating elements 20 located at the boundary of different heating zones 12, a second gap 40 larger than the first gap 30 is reserved, that is, the "interval gap" between heating zones 12 is greater than the "unit gap" between heating elements 20 within a zone. Through this partitioned arrangement and different gap design, the spatial arrangement of the heating elements 20 within the furnace chamber 11 presents a structural feature of compactness within zones and relatively sparseness between zones.

[0042] Understandably, on the one hand, because the first gap 30 between the heating elements 20 within the same heating zone 12 is small, the heat source distribution within the heating zone 12 is more concentrated and continuous, and the radiation and convection heating within the zone is more balanced. This is beneficial to the stability and uniformity of the temperature field within the heating zone 12, while avoiding the strong overheating phenomenon caused by a large number of heating elements 20 "clustering" in a certain local area. On the other hand, compared to simply reducing the density of heating elements 20 throughout the entire furnace 11, by setting up multiple heating zones 12 and introducing a larger second gap 40 between the heating zones 12, it is possible not only to reduce local temperature peaks and mitigate temperature gradients macroscopically, but also to differentiate the heating intensity of different heating zones 12 on a zoned basis. This allows for cooling and suppression of overheating while maintaining precise control over the temperature distribution of the furnace 11, improving the consistency of heating of the processed materials and the stability of product quality.

[0043] It should be noted that the heating zone 12 in this application can be two-dimensional, referring to the division of a wall on one side of the furnace chamber 11, or three-dimensional, referring to the division of the space within the furnace chamber 11. In a further embodiment, the above-mentioned division of the heating zone 12 can also be used to achieve a modular design in terms of structure: for example, multiple heating elements 20 within the heating zone 12 can be integrated into an independent heating plate, with each heating zone 12 corresponding to one heating plate, and multiple heating plates arranged sequentially along the length or height direction within the furnace chamber 11, rather than using a single large plate throughout the entire furnace chamber 11. This "multi-plate" modular arrangement, on the one hand, inherits the advantages of thermal isolation and buffering between heating zones 12 through the second gap 40, and on the other hand, enables the heating components corresponding to each heating zone 12 to achieve standardized, modular manufacturing and independent assembly, facilitating the installation, maintenance, and subsequent replacement of the furnace body 10, and reducing assembly difficulty and maintenance costs.

[0044] In some embodiments, the heating element 20 is a heating rod extending in a horizontal direction, and both the second gap 40 and the first gap 30 extend in a horizontal direction.

[0045] Specifically, the heating rods extend horizontally, and multiple heating zones 12 are sequentially formed vertically within the furnace chamber 11. A first gap 30 is formed between adjacent heating rods within the same heating zone 12, and a second gap 40 is formed between adjacent heating rods in adjacent heating zones 12. The second gap 40 is larger than the first gap 30. Because the heat within the furnace chamber 11 diffuses and flows upwards under the influence of gravity and airflow, the high-temperature airflow generated in the lower heating zone 12 enters the area of ​​the second gap 40 above it during its ascent. This transforms the second gap 40 from a simple "cold isolation zone" into a continuously heated transitional space, thus forming a thermal buffer layer of a certain thickness between adjacent heating zones 12.

[0046] Understandably, due to the aforementioned structure and the spontaneous upward heat transfer path, the heat released from the lower heating zone 12 is redistributed and gradually attenuated within the buffer area after entering the second gap 40. The upper heating zone 12 further heats the furnace 11 space above this buffer area. As a result, the temperature difference between adjacent heating zones 12 is smoothed out, reducing local temperature abrupt changes and improving the temperature gradient of the furnace 11 in the vertical direction. Compared with structures where heating rods are arranged vertically and it is difficult to form a gradual heating and buffer transition area from bottom to top in the vertical direction, this embodiment is more conducive to achieving a uniform temperature field distribution within the furnace 11 and improving the heating consistency of the heated workpiece in the height direction.

[0047] In some embodiments, the uppermost heating rod has a third gap 50 between it and the top of the furnace 11.

[0048] Specifically, the heating rods in the heating element 20 are arranged vertically in multiple columns. A space is reserved between the uppermost heating rod and the inner top wall of the furnace 11, forming a third gap 50. This third gap 50 can be understood as the distance between the uppermost edge of the heating rod array and the inner top surface of the furnace 11 in the vertical direction. Through structural design, this distance is limited to a preset range to create a specific spatial distribution relationship in the upper part of the furnace 11.

[0049] It is understandable that a third gap 50 is provided between the uppermost heating rod and the top of the furnace 11, so that the heating rod is no longer in direct contact with the top of the furnace 11, but is separated from it by a certain distance. When the heating rod is working, it dissipates heat upwards. If it is too close to the inner wall of the top of the furnace 11, the inner wall of the top will be under strong radiation and convection for a long time, which can easily lead to local overheating, material damage, or even shorten the life of the furnace lining. By reserving the third gap 50, on the one hand, the distance between the heating rod and the inner wall of the top of the furnace 11 is increased, so that the heat from the heating rod is transferred to the inner wall of the top only after crossing the gap, which is equivalent to "stretching" the heat transfer distance, thereby reducing the direct impact of high temperature on the top; on the other hand, the third gap 50 forms a buffer and flow space at the top of the furnace 11, where high-temperature gas can diffuse, swirl and mix, and then flow back downwards or to the sides, avoiding excessive heat concentration in the narrow area at the top and reducing the risk of extremely high temperature at the top. Based on the above arrangement, the temperature at the top of the furnace 11 is easier to control, and the heating process of the furnace wall is more gradual. This not only helps to suppress overheating at the top and extend the life of the furnace lining, but also helps to improve the uniformity of the internal temperature field of the furnace 11 and the consistency of the heating of the upper part of the heated material.

[0050] In some embodiments, the third gap 50 is greater than the second gap 40.

[0051] Specifically, the third gap 50 is larger than the second gap 40 because the heat dissipation conditions between the uppermost heating rod and the top of the furnace 11 are more limited. The second gap 40 (located between the heating rod and the side or lower furnace walls) usually still has some space and flow channels above it, allowing heat to diffuse and dissipate more easily through convection and radiation. However, the third gap 50, located at the top of the furnace 11, is directly above the top structure of the furnace 11, with virtually no additional space above it for high-temperature gas to continue rising, flowing, and dissipating heat—essentially a "closed end." Under these boundary conditions, if the third gap 50 were the same size as or smaller than the second gap 40, heat would accumulate more easily in the top area. Therefore, designing the third gap 50 to be larger than the second gap 40 allows for a larger buffer and flow space between the uppermost heating rod and the top of the furnace 11, accommodating its relatively poorer natural heat dissipation conditions.

[0052] Understandably, due to the lack of further heat dissipation space above the top of the furnace 11, the heat dissipation in the third gap 50 area at the top is significantly weaker than that in the area with the second gap 40. If the gap is insufficient, high-temperature gas will accumulate near the top, causing an abnormal increase in the temperature of the inner wall of the top of the furnace 11, resulting in problems such as local overheating and accelerated material thermal fatigue. By designing the third gap 50 to be larger than the second gap 40, on the one hand, the distance between the heating rod and the inner wall of the top of the furnace 11 is increased, lengthening the path of heat transfer from the heating rod to the inner wall of the top, thus spatially weakening the intensity of radiation and convection heat transfer; on the other hand, the larger third gap 50 provides a relatively larger flow and diffusion volume for high-temperature gas. Even if there is no additional space for heat dissipation above the top, the gas can still swirl, mix, and flow back laterally or downward within this gap, thereby slowing down the accumulation of heat at the top. This can effectively reduce the peak temperature of the inner wall of the top of the furnace 11, improve the heat dissipation in the top area, suppress local overheating and thermal damage at the top, extend the furnace lining life, and further improve the uniformity and operational stability of the overall temperature field of the furnace 11.

[0053] In some embodiments, a plurality of second gaps 40 are corresponding to the same sidewall of the furnace 11, and the width of the plurality of second gaps 40 corresponding to the same sidewall of the furnace 11 decreases from top to bottom.

[0054] Specifically, the "width" here refers to the vertical distance between the heating rod and the furnace wall on that side, that is, the vertical gap height measured along the height of the furnace chamber 11, rather than the horizontal distance in the front-to-back or left-to-right direction. "Decreases from top to bottom" means that the second gap 40 located at a higher position (near the top) in the furnace chamber 11 has the largest vertical gap height; as the position gradually decreases towards the bottom of the furnace chamber 11, the corresponding vertical gap 40 height decreases accordingly. In other words, if multiple heating rods are arranged sequentially from top to bottom on the same side wall, the vertical gap between the upper heating rod and the side wall is larger, while the vertical gap between the lower heating rod and the side wall is relatively smaller.

[0055] Understandably, within the furnace 11, heat and high-temperature gases exhibit a clear tendency to "accumulate upwards," with heat accumulation more likely occurring in the upper region of the furnace 11, resulting in localized temperatures higher than the lower region. If the width of the second gap 40 at each height is the same, the upper second gap 40 region, already prone to heat accumulation, will experience further exacerbation of heat buildup due to insufficient clearance, leading to heavier heating of the upper furnace lining and a shortened lifespan. By setting a larger vertical second gap 40 at the upper position, a larger buffer and flow space is maintained between the upper heating rod and the sidewall, allowing for greater volume of high-temperature gas for diffusion, swirling, and recirculation in this region, thereby reducing heat accumulation at the upper level and improving heat dissipation conditions of the upper sidewall. In the lower region, where heat accumulation is already weaker, the second gap 40 can be appropriately reduced to allow for more concentrated heat transfer to the workpiece and the lower part of the furnace 11, maintaining the uniformity of the overall temperature field. As a result, the risk of overheating in the upper part is suppressed, the heating gradient from top to bottom on the side wall is gentler, the furnace lining life is extended, and the temperature distribution in the vertical direction of the furnace chamber 11 is more balanced, which is conducive to improving the temperature consistency and heating quality of the heated material in the height direction.

[0056] Please refer to Figures 3 to 5 As shown, in some embodiments, the furnace body 10 includes a furnace door 13 and a furnace body 14, with an opening on one side of the furnace body 14, and the furnace door 13 covering the opening and enclosing the furnace body 14 to form a furnace chamber 11.

[0057] Both the furnace door 13 and the furnace body 14 are provided with a second gap 40, and the second gap 40 of the furnace door 13 is smaller than the second gap 40 of the furnace body 14.

[0058] Specifically, the phrase "both the furnace door 13 and the furnace body 14 are provided with a second gap 40" means that, regardless of whether the heating element 20 is arranged in the area on the furnace door 13 side or the furnace body 14 side, a second gap 40 is reserved between the multiple heating zones 12 to separate adjacent heating zones 12. This corresponds to the gap formed between adjacent heating elements 20 in different heating zones 12. Furthermore, on the furnace door 13 side, the second gap 40 between each heating zone 12 is designed to be smaller, while on the furnace body 14 side, the second gap 40 between each heating zone 12 is relatively larger. In other words, under the same arrangement conditions, the spacing between different heating zones 12 on the furnace door 13 side is designed to be smaller, making the arrangement of heating elements 20 between zones more compact; while on the furnace body 14 side, a larger second gap 40 is reserved between different heating zones 12, making their arrangement relatively more sparse. That is, the density of heating elements 20 between the heating zones 12 in the furnace door 13 area is higher than that in the furnace body 14 area.

[0059] Understandably, on the one hand, due to its opening and closing structure and sealing surface, the furnace door 13 typically has poorer sealing performance compared to the entirely enclosed furnace body 14. Heat is more easily leaked and dissipated from the furnace door 13 area, resulting in more significant heat dissipation and a lower temperature near the furnace door 13. If the second gap 40 between the furnace door 13 and the heating elements 20 on both sides of the furnace body 14 is the same, the density of the heating elements 20 on the furnace door 13 side and the furnace body 14 side will be basically the same. Given the inherently larger heat dissipation of the furnace door 13, the effective heating capacity of the furnace door 13 area will be relatively insufficient to compensate for this additional heat loss, easily leading to a lower temperature on the side of the furnace chamber 11 near the furnace door 13 and an uneven temperature field. By designing the second gap 40 corresponding to the furnace door 13 to be smaller, the spacing between adjacent heating elements 20 on one side of the furnace door 13 is reduced, and their number is made denser. This effectively increases the arrangement density of the heating elements 20 and the heating power per unit area in the furnace door 13 area, thereby providing targeted compensation for the larger heat dissipation of the furnace door 13. This allows the furnace door 13 to maintain a relatively similar temperature distribution to the furnace body 14 even when the furnace door 13 is not as effective at sealing as the furnace body 14 and has a greater heat dissipation effect. This reduces the temperature difference caused by heat dissipation from the furnace door 13, improves the temperature uniformity in the front and back directions of the furnace chamber 11 and the consistency of workpiece heating, and also helps to reduce the disturbance of the furnace door 13 to the overall temperature field of the furnace chamber 11 caused by opening and closing the furnace door 13.

[0060] It should be noted that the first gap 30 and the second gap 40 are actually spaces between the heating elements 20, and are not physical objects set on the surface of the furnace door 13 or the furnace body 14. The furnace door 13 and the furnace body 14 are both provided with the second gap 40, which should be understood as the second gap 40 being formed between the heating elements 20 corresponding to the furnace door 13 or the furnace body 14. This will not be elaborated further.

[0061] In some embodiments, the furnace body 14 includes a bottom plate 141 disposed opposite to the furnace door 13, and a side plate 142 connecting the bottom plate 141 and the furnace door 13;

[0062] Both the side plate 142 and the bottom plate 141 are provided with a second gap 40, and the second gap 40 of the bottom plate 141 is greater than the second gap 40 of the side plate 142.

[0063] Specifically, the furnace body 14 includes a bottom plate 141 opposite to the furnace door 13, and a side plate 142 connecting the bottom plate 141 and the furnace door 13. Multiple heating zones 12 are arranged on both the bottom plate 141 and the side plate 142, and each heating zone 12 contains several heating elements 20. Within the same location (bottom plate 141 or side plate 142), a second gap 40 is formed between adjacent heating elements 20 in different heating zones 12. Specifically, the second gap 40 corresponding to the area of ​​the bottom plate 141 is larger than the second gap 40 corresponding to the area of ​​the side plate 142. That is, the spacing between the heating elements 20 in different heating zones 12 on the bottom plate 141 is designed to be larger and the distribution relatively sparse, while the spacing between the heating elements 20 in different heating zones 12 on the side plate 142 is smaller and the distribution is more dense, thus creating differentiated heating element 20 arrangement densities at different locations in the furnace body 14.

[0064] Understandably, the bottom plate 141, compared to the side plate 142, generally does not involve an opening or closing structure and is usually located below the furnace chamber 11, thus being less affected by external environmental interference. Its sealing and insulation performance are superior to that of the side plate 142, making it less prone to significant heat loss. Therefore, in the area of ​​the bottom plate 141, the required heating capacity can still be maintained by increasing the second gap 40 and reducing the density of the heating elements 20, preventing a significant drop in bottom temperature. However, in the area of ​​the side plate 142, especially near the furnace door 13, heat loss is more likely due to the opening and closing of the furnace door 13 and edge heat dissipation, leading to a more rapid temperature drop. Reducing the second gap 40 corresponding to the side plate 142 and increasing the density of the heating elements 20 can compensate for the additional heat loss in this area. Therefore, in the overall design, a larger second gap 40 is used at the bottom plate 141 where the sealing effect is better to reduce redundant heating, and a smaller second gap 40 is used at the side plate 142 where the heat dissipation is relatively more obvious to enhance local heating. Thus, even when the heat preservation conditions of different parts are different, a relatively balanced and stable temperature distribution is still achieved in the furnace 11, improving the uniformity of the overall temperature field and avoiding unnecessary energy consumption.

[0065] In some embodiments, both the furnace door 13 and the furnace body 14 are provided with a first gap 30, and the first gap 30 of the furnace door 13 is smaller than the first gap 30 of the furnace body 14.

[0066] Specifically, based on the aforementioned improvement of temperature distribution in the furnace door 13 and furnace body 14 regions by adjusting the second gap 40, a further embodiment can optimize the first gap 30 within the same heating zone 12. Here, the first gap 30 refers to the gap formed between adjacent heating elements 20 within the same heating zone 12. That is, in the same heating zone 12, adjacent heating elements 20 closer to the furnace door 13 are closer together and arranged more densely; while in other areas of the furnace body 14 (especially those farther from the furnace door 13), the first gap 30 between adjacent heating elements 20 is relatively larger and arranged more sparsely. This design optimizes the spacing of the heating elements 20 within the same heating zone 12 by partitioning the area, creating a differentiated arrangement of heating element 20 density between the furnace door 13 region and the interior region of the furnace body 14.

[0067] Understandably, since the sealing effect of the furnace door 13 is usually not as good as that of the middle and rear of the furnace body 14, heat dissipation is more significant near the furnace door 13. Heat is more easily dissipated from the furnace door 13 and its surrounding structure, making it more difficult to raise and maintain the temperature near the furnace door 13, and resulting in areas with low temperatures. By designing the first gap 30 in the area corresponding to the furnace door 13 to be smaller, the heating elements 20 near the furnace door 13 in the same heating zone 12 are more densely packed. The number of heating elements 20 per unit length (or unit area) increases, and the effective heating power distribution is more concentrated, which can specifically compensate for the heat loss at the furnace door 13. Therefore, even if the heat dissipation at the furnace door 13 is large, the temperature in this area can be raised and maintained at a level close to that of other areas of the furnace body 14 by relying on the higher heating density. This reduces the temperature difference between the front and back of the furnace chamber 11, improves the temperature field distribution near the furnace door 13, and improves the temperature uniformity of the entire furnace chamber 11 and the consistency of workpiece heating.

[0068] In some embodiments, the kiln further includes an air inlet assembly for introducing inert gas into the furnace chamber 11, the air inlet of the air inlet assembly being located at the bottom of the furnace chamber 11.

[0069] Specifically, the kiln also includes an air intake assembly for introducing inert gas into the furnace chamber 11, and the air intake of the air intake assembly is located at the bottom of the furnace chamber 11. During operation, the inert gas enters the furnace chamber 11 from bottom to top, and together with the high-temperature gas inside the furnace chamber 11, they occupy the space of the furnace chamber 11, realizing the replenishment and replacement of airflow from bottom to top.

[0070] Understandably, since the inert gas enters from the bottom of the furnace 11, its upward flow will "push" and carry the existing high-temperature gas inside the furnace 11, causing the high-temperature gas to be transported and accumulated at the top of the furnace 11 along with the inert gas. On the one hand, this bottom-up gas flow helps reduce local heat retention at the bottom and promotes uniform heat diffusion along the height direction, thereby improving the temperature distribution inside the furnace 11. On the other hand, the high-temperature gas being "pushed up" to the height of the workpiece or heating zone 12 is more conducive to maintaining a sufficient high-temperature atmosphere in the target area, improving heating efficiency and temperature field stability. At the same time, the continuous replenishment of inert gas from the bottom also helps to form a relatively stable inert atmosphere environment inside the furnace 11, reducing the mixing of external gases such as oxygen, and further ensuring the quality of the heating or sintering process.

[0071] In some embodiments, the kiln further includes an extraction assembly for extracting gas from the furnace chamber 11, wherein the extraction port of the extraction assembly is correspondingly provided with respect to the second gap 40.

[0072] Specifically, the kiln also includes an extraction assembly for extracting gas from the furnace chamber 11, and the extraction port of the extraction assembly is correspondingly positioned to the second gap 40. That is, the extraction port is arranged at a position corresponding to the second gap 40 formed between the heating elements 20, and the gas inside the furnace chamber 11 is directionally extracted through the extraction port, so that the gas flow path inside the furnace chamber 11 matches the arrangement position of the second gap 40.

[0073] As mentioned earlier, the second gap 40 serves as a large spatial transition area between different heating zones 12, providing a primary channel for gas flow and heat transfer. It is understood that, due to the corresponding arrangement of the exhaust port and the second gap 40, a relatively significant negative pressure zone or pressure gradient is formed near the second gap 40 during the operation of the exhaust assembly. This guides the high-temperature gas and heat flow within the furnace 11 to preferentially flow and converge towards the second gap 40. Consequently, heat flow that might have previously stagnated or been unevenly distributed in localized areas is reorganized and re-flows along the direction of the second gap 40 under the drive of the exhaust, thus forming a relatively stable and continuous heat flow channel in the gap region between the heating elements 20. Based on this, the heat distribution inside the furnace 11 becomes more uniform, avoiding localized overheating or temperature dead zones, and making the temperature field in the second gap 40 region smoother, which is beneficial for improving overall temperature uniformity and the consistency of workpiece heating.

[0074] It should be noted that the order of description of the embodiments in this application is not intended to limit the priority of the embodiments.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application and in its specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0076] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many forms under the guidance of this application without departing from the spirit and scope of protection of the claims. All equivalent transformations made under the inventive concept of this application using the content of this application's specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A temperature-uniform kiln, characterized by, The kiln comprises: a furnace body, inside which a furnace chamber is formed for accommodating materials to be processed; heating elements arranged in the furnace chamber; wherein the furnace chamber comprises a plurality of heating zones, each of which comprises a plurality of heating elements, a first gap is formed between adjacent heating elements corresponding to the same heating zone, and a second gap is formed between adjacent heating elements corresponding to different heating zones, the second gap being larger than the first gap.

2. The kiln according to claim 1, wherein: the heating elements are heating rods extending in the horizontal direction, and the second gap and the first gap both extend in the horizontal direction.

3. The kiln of claim 2, wherein, a third gap is formed between the uppermost one of the heating rods and the top of the furnace chamber.

4. The kiln of claim 3, wherein, The third gap is larger than the second gap.

5. The kiln of claim 1, wherein, A plurality of second gaps corresponding to the same side wall of the furnace chamber are formed on the same side wall of the furnace chamber, and the widths of the plurality of second gaps corresponding to the same side wall of the furnace chamber decrease from top to bottom.

6. The kiln of claim 1, wherein, The furnace body comprises a furnace door and a furnace body, one side of the furnace body is open, and the furnace door covers the opening and the furnace body to form the furnace chamber. The furnace door and the furnace body are both provided with the second gap, and the second gap corresponding to the furnace door is smaller than the second gap corresponding to the furnace body.

7. The kiln of claim 6, wherein, The furnace body comprises a bottom plate arranged opposite to the furnace door, and a side plate connecting the bottom plate and the furnace door. The side plate and the bottom plate are both provided with the second gap, and the second gap corresponding to the bottom plate is larger than the second gap corresponding to the side plate.

8. The kiln of claim 6, wherein, The furnace door and the furnace body are both provided with the first gap, and the first gap corresponding to the furnace door is smaller than the first gap corresponding to the furnace body.

9. The kiln of claim 1, wherein, The kiln further comprises an air inlet assembly for introducing inert gas into the furnace chamber, and the air inlet port of the air inlet assembly is located at the bottom of the furnace chamber.

10. The kiln of claim 1, wherein, The kiln further comprises an air extraction assembly for extracting gas in the furnace chamber, and the air extraction port of the air extraction assembly is arranged corresponding to the second gap.

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