A heat treatment furnace with uniform heat field distribution

Abstract

The utility model discloses a heat treatment furnace that heat field distribution is even, including furnace shell, the rectangular hearth is formed in the furnace shell, the air flue is installed in the furnace shell, the air flue forms a plurality of side tuyere of located furnace hearth side phase and a plurality of lower tuyere of located furnace hearth bottom surface, the wind of by side tuyere blows along transverse flow, the wind of by lower tuyere blows along upper flow. Through set up side tuyere in furnace hearth side phase and set up lower tuyere in furnace hearth bottom surface, make the wind can be blown into furnace hearth from different direction, compare with the wind flow of prior art only can flow along horizontal direction from lateral, the setting of lower tuyere effectively solved the problem of furnace hearth bottom gas flow blind area, make the gas that originally deposit of bottom can be disturbed to participate in heat exchange effectively, greatly promoted the heat exchange efficiency of whole gas in furnace hearth, help to improve the uniformity of heat field in furnace hearth, and then promote the heat treatment quality of product.

Description

Technical Field

[0001] This utility model mainly relates to the field of heat treatment furnace technology, and in particular to a heat treatment furnace with uniform heat field distribution. Background Technology

[0002] Heat treatment is a process for improving the properties of metallic materials, including various methods such as quenching, tempering, annealing, and normalizing. A heat treatment furnace is an industrial device used to heat-treat metallic materials. Structurally, it typically has a closed furnace body containing heating elements. These heating elements can be resistance wires, silicon carbide rods, etc., capable of generating sufficient heat to raise the furnace temperature, bringing the metal workpiece placed inside to the predetermined heat treatment temperature range. Heat treatment furnaces come in various types, and can be classified according to their heating method, such as resistance furnaces and induction furnaces. Resistance furnaces use electric current passing through resistance wires to heat the workpiece; they are simple to operate, offer precise temperature control, and are widely used in the heat treatment of various small, precision parts. Induction furnaces utilize the principle of electromagnetic induction, causing the workpiece to generate its own heat; they heat rapidly and are particularly suitable for processes such as surface hardening. Based on operating temperature, they can be classified as low-temperature furnaces, medium-temperature furnaces, and high-temperature furnaces, capable of meeting the temperature requirements of different metallic materials and heat treatment processes. They play a crucial role in many fields such as machinery manufacturing, aerospace, and the automotive industry, and are one of the key pieces of equipment for ensuring the quality and performance of metal products.

[0003] To achieve a uniform heat distribution within the furnace, ventilation is often used to agitate the gas, enabling sufficient heat exchange between different parts of the furnace and thus improving the uniformity of the heat field. However, in existing technologies, due to improper duct design, the airflow used to agitate the gas typically flows horizontally from the sides of the furnace. This lateral airflow fails to completely cover the bottom area of ​​the furnace, creating a blind spot for gas flow. In this blind spot, some gas settles and cannot effectively participate in gas agitation and heat exchange within the furnace. Consequently, the uniformity of the heat field within the furnace is difficult to achieve, potentially negatively impacting the heat treatment quality of the product. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a heat treatment furnace with uniform heat field distribution.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A heat treatment furnace with uniform heat distribution includes a furnace shell, within which a rectangular furnace chamber is formed. An air duct is installed within the furnace shell, and the air duct has several side air inlets located on the sides of the furnace chamber and several bottom air inlets located on the bottom of the furnace chamber. Air blown from the side air inlets flows laterally, while air blown from the bottom air inlets flows upwards. By providing side air inlets on the sides of the furnace chamber and bottom air inlets on the bottom, air can be blown into the furnace chamber from different directions. Compared to existing technologies where airflow can only flow laterally and horizontally, the bottom air inlets effectively solve the problem of blind spots in gas flow at the bottom of the furnace chamber. This allows gas that was previously deposited at the bottom and unable to effectively participate in heat exchange to be disturbed, greatly improving the overall heat exchange efficiency of the gas within the furnace chamber. This helps to improve the uniformity of the heat field within the furnace chamber, thereby improving the heat treatment quality of the product.

[0007] As a further improvement to the above technical solution:

[0008] The two rows of side tuyeres are positioned opposite each other on both sides of the furnace, with the side tuyeres on the same side arranged vertically at intervals. The air blown from the lowermost side tuyer flows horizontally. This vertically spaced arrangement of the side tuyeres allows for lateral agitation of the gas within the furnace from multiple height positions, expanding the coverage of the lateral airflow within the furnace space. The horizontally flowing air from the lowermost side tuyer can better converge and blend with the upward-flowing air from the lower tuyer at the bottom of the furnace, further enhancing the agitation of the gas in the bottom region of the furnace, reducing gas deposition, and further improving the uniformity of the thermal field.

[0009] Except for the bottommost side vent, the air blown from the other side vents flows obliquely upwards. This oblique upward flow of air from the other side vents allows the gas at different heights within the furnace to form more complex and orderly flow paths. Compared to simple horizontal or vertical airflow, the oblique upward flow can mix gases at different levels, further enhancing the turbulence effect within the furnace and promoting more uniform heat distribution throughout the furnace, thus optimizing the thermal field uniformity.

[0010] The angle between the wind blowing from the side vents and flowing obliquely upwards and the horizontal plane is 10°-30°. Defining the range of this angle ensures that the wind blowing from the side vents interacts optimally with the wind blowing from the downwind vents and the gases in other areas of the furnace at a specific angle. This ensures that within this angle range, the airflow can cover the furnace space to the maximum extent, achieving optimal gas disturbance and heat exchange effects, thereby guaranteeing that the uniformity of the thermal field is ideal.

[0011] The downdraft vent is located in the center, and the air blowing from it flows vertically upwards. This central location and upward airflow allow the airflow to diffuse upwards from the center of the furnace bottom, evenly affecting all corners of the furnace bottom. Combined with the air from the side vents, this effectively fills the gaps in gas flow at the furnace bottom, ensuring that all gas at the bottom of the furnace can fully participate in heat exchange. This significantly improves the uniformity of the thermal field at the furnace bottom, preventing any adverse effects on the heat treatment quality of the product due to uneven thermal distribution.

[0012] The airflow from the side vents and the downdraft vents forms a spiral airflow. With this spiral airflow, the gas inside the furnace no longer flows linearly but in a spiral, omnidirectional pattern. This flow pattern allows for more thorough contact and mixing of the gas, more complete heat exchange, and even distribution of heat throughout the furnace, comprehensively improving the uniformity of the thermal field within the furnace. This provides a more stable and uniform heat treatment environment for the product, effectively ensuring the consistency and stability of the product's heat treatment quality.

[0013] The furnace shell is formed by splicing together several annular furnace shell segments, and the air duct is formed by splicing together several annular air duct segments. Each air duct segment corresponds one-to-one with a furnace shell segment, and the corresponding air duct segments are of equal length to the furnace shell segments. This splicing method of annular furnace shell segments and air duct segments facilitates the manufacturing and installation of the heat treatment furnace. During production, the lengths of the furnace shell and air ducts can be flexibly adjusted according to actual needs, improving production flexibility and adaptability. Simultaneously, the one-to-one correspondence and equal length design ensures a tight fit between the air duct and the furnace shell, avoiding problems such as airflow leakage or unevenness caused by size mismatch, guaranteeing the overall performance of the heat treatment furnace, and helping to maintain the uniformity of the thermal field within the furnace chamber.

[0014] The adjacent air duct sections are connected. This connection ensures smooth airflow within the ducts, preventing airflow obstruction or pressure unevenness at the joints. Stable airflow helps to evenly distribute air from each duct outlet, thus maintaining the stability of gas disturbance and heat exchange within the furnace. This plays a crucial role in ensuring the uniformity of the thermal field, enabling the heat treatment furnace to operate continuously and stably.

[0015] The heat treatment furnace also includes an inner liner, which is disposed between the furnace shell and the air duct. The inner liner is formed by splicing together several annular inner liner segments, each corresponding to a furnace shell segment, and the corresponding inner liner segments are of equal length to the furnace shell segments. The inner liner provides further isolation and protection. On the one hand, it prevents heat loss from the furnace shell from being too rapid, improving energy efficiency; on the other hand, it blocks the direct impact of airflow from the air duct on the furnace shell, extending the service life of the furnace shell. The design of the annular inner liner segments corresponding to the furnace shell segments and of equal length ensures the tightness and stability of the inner liner installation, further enhancing its heat insulation and protection effects, and helping to maintain a stable thermal environment inside the furnace.

[0016] The heat treatment furnace also includes a thermal insulation layer, which is filled in the space between the furnace shell and the inner liner. The thermal insulation layer significantly reduces heat loss through the furnace shell, allowing heat within the furnace chamber to be retained for heat exchange to the maximum extent possible. This improves the energy efficiency of the heat treatment furnace and reduces energy consumption. Simultaneously, the stable internal thermal environment helps maintain the uniformity of the thermal field, preventing localized temperature changes caused by heat loss and further ensuring the quality of the heat-treated product. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of a heat treatment furnace;

[0018] Figure 2 This is a schematic diagram of the airflow in a heat treatment furnace;

[0019] Figure 3 This is a schematic diagram of the furnace shell section;

[0020] Figure 4 This is a structural diagram of the air duct section;

[0021] Figure 5 This is a schematic diagram of the inner liner section.

[0022] The labels in the diagram represent: 1. Furnace shell; 11. Furnace shell section; 2. Furnace chamber; 3. Air duct; 31. Side air inlet; 32. Downward air inlet; 33. Air duct section; 4. Inner liner; 41. Inner liner section; 5. Thermal insulation layer. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example

[0025] like Figures 1 to 5 As shown in the figure, this embodiment describes in detail the specific structure of a heat treatment furnace with uniform heat field distribution. The heat treatment furnace is mainly composed of furnace shell 1, furnace chamber 2, air duct 3, inner liner 4 and heat insulation layer 5.

[0026] The furnace shell 1 is formed by splicing together several annular furnace shell sections 11. Adjacent annular furnace shell sections 11 are welded together by staggered upper and lower steel plates with double welds inside and outside. This welding connection method has many advantages. On the one hand, it can ensure that the furnace shell 1 has sufficient connection strength, ensuring that it will not loosen or separate due to external forces during long-term use, thus ensuring the overall stability of the equipment. On the other hand, the welding connection can eliminate gaps between adjacent furnace shell sections, thereby effectively preventing gas leakage, ensuring a stable gas environment inside the furnace 2, preventing heat loss, and improving energy utilization efficiency.

[0027] A rectangular furnace chamber 2 is formed inside the furnace shell 1, and an air duct 3 is installed inside the furnace shell 1. The air duct 3 is formed by splicing several annular air duct segments 33, and each air duct segment 33 corresponds one-to-one with a furnace shell segment 11. The corresponding air duct segments 33 are of the same length as the furnace shell segments 11. Adjacent air duct segments 33 are connected by welding or sealing, which ensures the smooth flow of gas in the air duct 3, prevents gas leakage at the air duct connection, ensures the sealing and stability of the entire air duct system, and allows the gas to flow smoothly in the air duct and be blown out smoothly according to the designed path.

[0028] The air duct 3 has several side air inlets 31 located on the sides of the furnace 2 and several bottom air inlets 32 located on the bottom of the furnace 2. Two rows of side air inlets 31 are arranged opposite each other on both sides of the furnace 2, with the side air inlets 31 on the same side arranged vertically at intervals. The air blown from the lowest side air inlet 31 flows horizontally; this design directly disturbs the gas in the bottom area of ​​the furnace 2, overcoming the deficiency in existing technologies where lateral airflow cannot cover the bottom of the furnace. Except for the lowest side air inlet 31, the air blown from the other side air inlets 31 flows obliquely upwards. This allows the air blown from side air inlets 31 at different heights to form different flow trajectories, enhancing the disturbance effect on the gas in different height areas within the furnace 2 and promoting heat exchange between gases. Furthermore, the angle between the wind blowing out from the side air outlet 31 and the horizontal plane has been determined to be 10°-30° through multiple experiments and simulations. Within this angle range, it is possible to ensure that the gas effectively disturbs the space inside the furnace 2 while avoiding excessive wind force that could cause excessive impact on the workpiece placed inside the furnace 2, thus ensuring the stability of the workpiece during the heat treatment process.

[0029] The downdraft vent 32 is located in the middle of the bottom surface of the furnace chamber 2, and the air blown from it flows vertically upwards. This design effectively disturbs the gas in the central area at the bottom of the furnace chamber 2, coordinating with the air blown from the side vent 31 to form a good gas flow circulation. The air blown from the side vent 31 and the downdraft vent 32 work together to form a spiral airflow within the furnace chamber 2. This spiral airflow greatly improves the mixing degree of the gas within the furnace chamber 2, allowing for sufficient heat exchange between gases throughout the furnace chamber 2. This significantly improves the uniformity of the thermal field within the furnace chamber 2, thereby ensuring that the metal workpieces placed in the furnace chamber 2 are heated uniformly during heat treatment, and improving the heat treatment quality of the products.

[0030] In addition, the heat treatment furnace also includes an inner liner 4, which is located between the furnace shell 1 and the air duct 3. The inner liner 4 is formed by splicing several annular inner liner segments 41, each corresponding to a furnace shell segment 11, and the corresponding inner liner segments 41 are of equal length to the furnace shell segments 11. The inner liner 4 serves to further protect the furnace shell 1 and optimize the internal environment of the furnace chamber 2. It can withstand the high-temperature environment inside the furnace chamber 2, reducing the direct impact of high temperatures on the furnace shell 1 and extending the service life of the furnace shell 1. At the same time, it can reflect and store heat inside the furnace chamber 2 to a certain extent, improving heat utilization efficiency.

[0031] A thermal insulation layer 5 is filled in the gap between the furnace shell 1 and the inner liner 4. The thermal insulation layer 5 is made of high-efficiency thermal insulation materials such as ceramic fiber. This material has good thermal insulation performance, which can effectively prevent heat from the furnace chamber 2 to the furnace shell 1, reduce heat loss, reduce energy consumption, and improve the energy utilization efficiency of the heat treatment furnace. At the same time, it can also ensure that the outer surface temperature of the furnace shell 1 does not get too high, avoiding safety hazards such as burns to operators.

[0032] Furthermore, the furnace chamber 2 is equipped with U-shaped heating tubes for heating and thermocouples for monitoring the temperature of each area within the furnace chamber 2, both of which are fixed to the furnace shell section 11. By modularly arranging the furnace shell section 11, the air duct section 33, and the inner liner section 41, manufacturers can freely increase or decrease the number of each section to change the length of the furnace body, thereby obtaining heat treatment furnaces of different volumes.

[0033] In summary, the heat treatment furnace of this embodiment, through the rational design of the structure of the air duct 3, the layout of the air outlets, and the direction of air flow, combined with the synergistic effect of the furnace shell 1, the inner liner 4, and the heat insulation layer 5, can effectively solve the problem of the difficulty in achieving ideal uniformity of the heat field inside the furnace in the prior art, improve the heat treatment quality of the product, and has significant practical value and economic benefits.

[0034] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A heat treatment furnace with uniform heat field distribution, comprising a furnace shell (1), wherein a rectangular furnace chamber (2) is formed inside the furnace shell (1), characterized in that: The furnace shell (1) is equipped with an air duct (3). The air duct (3) forms a number of side air vents (31) located on the side of the furnace chamber (2) and a number of down air vents (32) located on the bottom surface of the furnace chamber (2). The air blown out by the side air vents (31) flows horizontally, and the air blown out by the down air vents (32) flows upward.

2. The heat treatment furnace with uniform heat field distribution according to claim 1, characterized in that: The two rows of side air inlets (31) are arranged opposite each other on both sides of the furnace (2), and the side air inlets (31) on the same side are arranged vertically at intervals, with the air blown out by the side air inlet (31) at the bottom flowing horizontally.

3. The heat treatment furnace with uniform heat field distribution according to claim 2, characterized in that: Except for the bottommost side air vent (31), the air blown out by the other side air vents (31) flows obliquely upward.

4. The heat treatment furnace with uniform heat field distribution according to claim 3, characterized in that: The angle between the wind blowing out from the side vent (31) and the horizontal plane is 10°-30°.

5. A heat treatment furnace with uniform heat field distribution according to any one of claims 2-4, characterized in that: The downwind vent (32) is located in the middle, and the wind blowing out from it flows vertically upward.

6. The heat treatment furnace with uniform heat field distribution according to claim 5, characterized in that: The wind blown out by the side air outlet (31) and the downwind outlet (32) forms a spiral airflow.

7. The heat treatment furnace with uniform heat field distribution according to claim 1, characterized in that: The furnace shell (1) is formed by splicing together several annular furnace shell segments (11), and the air duct (3) is formed by splicing together several annular air duct segments (33); the air duct segments (33) correspond one-to-one with the furnace shell segments (11), and the corresponding air duct segments (33) are of the same length as the furnace shell segments (11).

8. The heat treatment furnace with uniform heat field distribution according to claim 7, characterized in that: The adjacent air duct sections (33) are connected.

9. The heat treatment furnace with uniform heat field distribution according to claim 7, characterized in that: The heat treatment furnace also includes an inner liner (4), which is located between the furnace shell (1) and the air duct (3). The inner liner (4) is formed by splicing together several annular inner liner segments (41), and the inner liner segments (41) correspond one-to-one with the furnace shell segments (11). The corresponding inner liner segments (41) and the furnace shell segments (11) are of equal length.

10. The heat treatment furnace with uniform heat field distribution according to claim 9, characterized in that: The heat treatment furnace also includes a heat insulation layer (5), which is filled in the interlayer between the furnace shell (1) and the inner liner (4).

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