Circulating convection heating type glass electric kiln

Abstract

The invention relates to the technical field of electric kilns, in particular to a circulating convection heating type glass electric kiln which comprises a smelting furnace, a flow guide pipe is installed on the surface of the smelting furnace, an air flow conveying assembly driven by a driving part is assembled at the air inlet end of the flow guide pipe, and the air outlet end of the flow guide pipe communicates with the interior of the smelting furnace in the tangential direction of the smelting furnace. The air outlet end of the flow guide pipe is fixedly connected with a flow guide plate, two guide blades are rotationally installed in the flow guide pipe, the movable ends of the guide blades are close to the air outlet end of the flow guide pipe, the upper wall face and the lower wall face of the flow guide pipe are rotationally connected with transversely-arranged rotating shafts, and one ends of the two guide blades are fixedly connected with the rotating shafts respectively. The invention aims to solve the problem that the stability of a glass melting and clarifying process is finally influenced by insufficient heat exchange and non-uniform temperature of different areas in a furnace due to incomplete air flow coverage and unbalanced distribution caused by the design of a single air outlet of the existing equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric kiln, in particular to a circulating convection heating type glass electric kiln. BACKGROUND

[0002] The circulating convection heating type glass electric kiln is a special equipment specially designed for glass processing scene, which uses electricity as clean and environmentally friendly heating energy, does not need to rely on traditional fuel, and has better environmental protection and adaptability in the heating process. It relies on the core operation mode of air circulation convection to make the heat flow efficiently in the furnace, realize transmission, and accurately meet the needs of glass melting, clarification and other core processing links, thereby laying a foundation for smooth development of these key processes and effectively ensuring stable progress of the overall process.

[0003] The single air outlet structure adopted by the existing equipment makes the air flow coverage range limited and unevenly distributed in the furnace. This limitation in the air flow level further leads to insufficient heat exchange in different areas of the furnace, obvious temperature distribution deviation, and finally adversely affects the process stability of glass melting and clarification. SUMMARY

[0004] The purpose of the present application is to provide a circulating convection heating type glass electric kiln to solve the problem of single air outlet design of the existing equipment, which leads to incomplete air flow coverage and uneven distribution, further causes insufficient heat exchange in different areas of the furnace, uneven temperature, and finally affects the process stability of glass melting and clarification.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A circulating convection heating type glass electric kiln, comprising a melting furnace, a flow guide pipe is mounted on the surface of the melting furnace, a gas flow conveying assembly driven by a driving member is assembled at the gas inlet end of the flow guide pipe, the gas outlet end of the flow guide pipe is communicated with the inside of the melting furnace along the tangent direction of the melting furnace, a flow guide plate is fixedly connected to the gas outlet end of the flow guide pipe, two guide vanes are rotatably installed in the flow guide pipe, and the movable end of the guide vane is close to the gas outlet end of the flow guide pipe.

[0007] Preferably, the upper and lower walls of the flow guide pipe are rotatably connected with transversely arranged shafts, one end of each of the two guide vanes is fixedly connected with one of the shafts, and the guide vanes are rotatably connected with the flow guide pipe through the transversely arranged shafts.

[0008] Preferably, the width of the guide vane is adapted to the front and rear spacing of the inner cavity of the flow guide pipe.

[0009] Preferably, the upper and lower ends of the flow guide pipe are threadedly connected with adjusting bolts, and the back of each of the two adjusting bolts abuts against one of the guide vanes.

[0010] Preferably, the gas inlet end of the flow guide pipe is trumpet-shaped, and the inlet diameter matches the outer diameter of the centrifugal impeller, and the subsequent inner diameter gradually shrinks and is smoothly connected to the outlet diameter through a circular arc.

[0011] Preferably, the number of the flow guide plates is three, which are uniformly distributed from top to bottom, and the inclination increases in turn.

[0012] Preferably, the airflow conveying assembly is a centrifugal impeller, and the driving member is a variable frequency motor, which is drivingly connected with the centrifugal impeller through a transmission mechanism.

[0013] Preferably, an elastic reset element is arranged between the flow guide pipe and the guide vane, and the elastic reset element makes the guide vane abut against the adjusting bolt.

[0014] Compared with the prior art, the beneficial effects of the present application are:

[0015] 1. The airflow guiding logic of the tangent outflow of the flow guide pipe and the three-layer flow guide plate makes the horizontal spiral convection more smooth, adapts to the airflow demand of different areas in the furnace, and the airflow effect is efficient and uniform, the trumpet-shaped gas inlet end of the flow guide pipe realizes airflow speed-up, the tangent outflow forms horizontal spiral convection, the three-layer flow guide plate covers the upper, middle and lower areas in the furnace respectively, and the airflow unevenness problem of single outlet is completely solved.

[0016] 2. The guide vane can be turned over by the rotating shaft, and the adjusting bolt limits the maximum turning opening range of the vane, which can switch the flow field guiding and control the airflow of specific flow guide plates, meet the airflow demand of different processing stages, simplify the structure and be reliable, without electrical adjustment, relying on mechanical structure and airflow to realize guiding control, and reduce the risk of electrical failure under high temperature. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a top view of the whole application;

[0018] Figure 2 It is an enlarged view of A in the present application; Figure 1

[0019] Figure 3 It is a structural schematic view of the flow guide pipe of the present application;

[0020] Figure 4 It is a front view of the flow guide pipe of the present application.

[0021] In the figure: 1, furnace; 2, flow guide pipe; 3, centrifugal impeller; 4, guide vane; 5, adjusting bolt; 6, flow guide plate; 7, rotating shaft. DETAILED DESCRIPTION

[0022] ​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0023] Please refer to Figures 1 to 4 The present application provides a technical solution.

[0024] A circulating convection heating type glass electric furnace, comprising a melting furnace 1, a main melting electric heating system, an electrode conduction system, a cooling circulation system and an auxiliary heating system, each system cooperates to form a complete production system:

[0025] The main melting electric heating system comprises a three-phase special magnetic modulation transformer, a top-inserted electrode group and a matched control unit and connecting component. The three-phase special magnetic modulation transformer is configured with an independent signal receiving module, which can receive the temperature detection signal of the glass liquid in the melting furnace 1 in real time. The output voltage and current are dynamically adjusted through the on-load voltage regulation melting technology to ensure the accurate matching of the power output and the melting demand. The top-inserted electrode group is fixed to the preset mounting hole position at the top of the melting furnace 1 through a detachable mounting structure and is arranged in a multiple diagonal line arrangement mode, which accurately covers the entire melting area of the melting furnace 1. The electrodes of each group are arranged in a triangular shape and are one-to-one matched with the mounting hole positions at the top of the melting furnace 1. The top end of the electrode is tightly electrically connected with the conductive arm through the conductive connecting piece, and the bottom end extends into the glass liquid melting area inside the melting furnace 1. The output end of the three-phase special magnetic modulation transformer forms a closed conductive loop with the top-inserted electrode group through a low-impedance connecting component. The low-harmonic power output can reduce the power grid interference and avoid the electrode current fluctuation. In combination with the shortened electrode spacing in the triangular arrangement, the current is uniformly diffused in the glass liquid, forming a uniform electric field covering the entire melting area.

[0026] The electrode conduction system comprises a conductive arm, a core wire, a connecting joint and a protective shell, each component cooperates to ensure the conduction efficiency and structural stability, the core wire is made of copper pipe material with high conductivity, the two ends of the copper pipe wire are fixed with the connecting joint through crimping or welding, one end of the connecting joint forms a tight clamping connection with the top end of the top electrode, and the other end is connected with the input end of the conductive arm through a copper bar or a conductive block to realize low resistance connection, ensuring that the current transmission has no obvious loss, the conductive arm is integrated with a water cooling structure, the conductive arm is connected with each group of top electrode in a triangular shape, realizing efficient conduction transmission between the electrode and the transformer, the electrode conduction system uses copper pipe as the core wire, combined with the integrated water cooling structure, the water cooling structure comprises a closed water cooling channel surrounding the copper pipe wire, the two ends of the water cooling channel are respectively provided with a water inlet and a water outlet, the inner wall of the channel and the outer wall of the copper pipe wire maintain a predetermined distance, forming a uniform cooling space, avoiding deformation or conductivity decline of the wire caused by uneven cooling, the conductive arm is externally provided with a high-temperature-resistant protective shell, the protective shell and the water cooling channel form double-layer protection, and the overall structure of the conductive arm is adapted to the arrangement spacing of the triangular electrode, ensuring that multiple conductive arms do not interfere with each other, and forming stable assembly with the top structure of the furnace 1.

[0027] The cooling circulation system comprises a pure water circulation unit, a connecting pipeline and a sealing element, and builds a closed loop cooling and energy saving system, the pure water circulation unit is composed of a water storage assembly, a circulation power assembly, a cooling assembly and a filtering assembly, the water storage assembly is used for storing pure water meeting the electrical conductivity requirement, the circulation power assembly provides power for the pure water flow, the cooling assembly is used for cooling the heated pure water flowing out of the water cooling channel, and the filtering assembly removes impurities generated in the circulation process, the connecting pipeline is connected with the water inlet and the water outlet of the water cooling channel of the conductive arm through the sealing element.

[0028] The pure water circulation unit is communicated with the water cooling structure of the conductive arm, realizing the recycling of pure water and reducing the electrical conductivity of the circulating water, the design of the pure water circulation system not only saves water resources, but also avoids energy waste caused by electric leakage by reducing the electrical conductivity of the circulating water, and the environmental protection performance is significantly improved.

[0029] The auxiliary heating system comprises a bottom auxiliary electrode, a cooperative control module and a mounting and fixing structure, the bottom auxiliary electrode is installed in a mounting hole arranged at the bottom of the furnace 1 through a high-temperature-resistant sealing structure, the top end of the electrode extends into the glass liquid clarification and forming area of the lower pool of the furnace 1, and a plurality of bottom auxiliary electrodes are arranged according to the uniform distribution principle, ensuring that the energy supplement area is fully covered without dead angle, the cooperative control module is in signal communication with the control unit of the main melting electrode heating system, and the temperature distribution data of the glass liquid in the clarification and forming stage is received in real time, when the temperature of a certain area is lower than the preset standard, the bottom auxiliary electrode of the corresponding area automatically starts precise energy supplement, the energy supplement power is dynamically adjusted according to the temperature difference, and energy waste caused by excessive heating is avoided.

[0030] The furnace 1 adopts a polygonal cavity structure with a gradually decreasing upper and lower pool design. A guide pipe 2 is installed on the surface of the furnace 1. The air inlet end of the guide pipe 2 is equipped with an airflow conveying assembly driven by a drive component. The airflow conveying assembly is a centrifugal impeller 3, and the drive component is a variable frequency motor. The variable frequency motor is connected to the centrifugal impeller 3 through a transmission mechanism. Its power is provided by an external variable frequency motor. The output end of the variable frequency motor is connected to the rotating shaft of the centrifugal impeller 3 through a flexible coupling. Alternatively, the transmission path can be extended through a transmission shaft to ensure that the motor installation position is ≥30cm away from the top of the furnace 1 and away from the high-temperature zone. The centrifugal impeller 3 is made of Inconel 718 nickel-based high-temperature alloy, which can withstand temperatures up to 650℃ and has excellent resistance to hot corrosion.

[0031] The air inlet of the guide pipe 2 is trumpet-shaped, with the inlet diameter matching the outer diameter of the centrifugal impeller 3. The inner diameter gradually shrinks and transitions to the outlet diameter through a smooth arc. This trumpet-shaped design achieves airflow acceleration through a gradually narrowing cross section, providing sufficient power for the formation of horizontal spiral convection by tangential airflow.

[0032] The outlet end of the guide pipe 2 is connected to the interior of the furnace 1 along the tangential direction of the furnace 1, which can guide the airflow discharged from the centrifugal impeller 3 to the tangential direction of the furnace cavity, ensuring the horizontal spiral convection effect. A guide plate 6 is fixedly connected to the outlet end of the guide pipe 2. (Refer to...) Figure 4 There are three guide plates 6, which are evenly distributed from top to bottom and the inclination increases in sequence. The three guide plates 6 guide the airflow to the upper, middle and lower parts of the furnace 1 respectively, effectively avoiding the problem of uneven airflow distribution caused by a single outlet.

[0033] The upper and lower walls of the guide pipe 2 are rotatably connected to horizontally arranged rotating shafts 7. Guide vanes 4 are fixedly connected to the surfaces of both rotating shafts 7. Rotating the rotating shafts 7 causes the guide vanes 4 to rotate up and down. The width of the guide vanes 4 is adapted to the front-to-back spacing of the inner cavity of the guide pipe 2, and the movable end of the guide vanes 4 is close to the air outlet of the guide pipe 2. Airflow passes between the two guide vanes 4. By rotating the rotating shafts 7, the guide vanes 4 rotate up and down. By adjusting the rotation angle of the guide vanes 4, the flow field guidance can be switched and the radial coverage range can be adjusted. (Reference) Figure 4 When the movable end of the upper and lower guide vanes 4 is adjusted to the position of the middle guide plate 6, the airflow can be concentrated and flow out from the middle guide plate 6. That is, by controlling the position of the movable end, the airflow can be discharged from the specific guide plate 6. The guide vanes 4 are made of zirconia ceramic [ZrO2, temperature resistance ≥1600℃, bending strength ≥400MPa], which is suitable for the high temperature environment inside the furnace.

[0034] The upper and lower ends of the guide tube 2 are threaded with adjusting bolts 5. Each adjusting bolt 5 abuts against the back of a guide vane 4. Rotating the adjusting bolts 5 allows them to move axially, thus changing the depth of insertion into the guide tube 2. When airflow passes between the two guide vanes 4, it pushes the guide vanes 4 open. The adjusting bolts 5, by pressing against the back of the guide vanes 4, directly limit the maximum opening range of the guide vanes 4. By adjusting the extension length of the adjusting bolts 5, and with the help of airflow thrust, the guide vanes 4 are stably pressed against the adjusting bolts 5, thereby controlling the airflow from the corresponding guide plate 6. (Reference) Figure 4 When the extension length of the adjusting bolt 5 is set to allow the blades to open only within the range of the intermediate guide plate 6, the airflow will concentrate and flow out from the intermediate guide plate 6. This design does not require electrical adjustment. It simplifies the internal structure of the guide tube 2 by relying on the synergistic effect of the mechanical structure and airflow, and is more suitable for the high-temperature environment inside the furnace. If necessary, an elastic reset element can also be added. The elastic reset element makes the guide blade 4 firmly abut against the adjusting bolt 5. For example, a reset spring can be set between the inner wall of the guide tube 2 and the back of the guide blade 4. When the adjusting bolt 5 moves outward, the guide blade 4 will automatically flip and abut against the end of the adjusting bolt 5 under the elastic force of the reset spring.

[0035] The specific steps of this plan are as follows: When the system is started, the cooling circulation system is started first, and the pure water circulation unit is turned on to ensure that the pure water circulates normally in the water-cooled structure of the conductive arm. Then, the external frequency conversion motor is started, which drives the centrifugal impeller 3 to rotate through the transmission structure. The airflow intake status is observed to confirm that the airflow at the air inlet of the guide pipe 2 is smooth. Then, the main melting electric heating system is started, and the circuit between the three-phase special magnetic adjustment transformer and the top electrode group is connected. On-load tap-changing fluxing technology is used to provide a stable low harmonic power supply for the top electrode group to start the glass melt melting preheating.

[0036] The core parameter adjustment involves adjusting the adjusting bolts 5 at the upper and lower ends of the guide pipe 2, setting the extension length according to production needs, and limiting the maximum opening range of the guide vanes 4. If it is necessary to concentrate the airflow from the middle guide plate 6, adjust the extension length of the adjusting bolts 5 so that the guide vanes 4 can only move within the range of the middle guide plate 6. The speed of the centrifugal impeller 3 is adjusted by the variable frequency motor to control the airflow speed. With the acceleration effect of the gradually narrowing section of the guide pipe 2, a stable horizontal spiral convection is formed along the tangential direction of the furnace 1, avoiding uneven airflow distribution.

[0037] Phased operation monitoring: During the glass melting stage, the main melting electric heating system is kept running stably. By relying on the diagonal and triangular arrangement of the top-inserted electrodes, the electrode conductive distance is shortened to avoid cold-core defects and current skin effect. During the glass clarification stage, the auxiliary heating system is started, and the bottom-inserted auxiliary electrodes are opened to work in conjunction with the main melting electric heating system for precise energy replenishment. The depth of the adjusting bolt 5 is adjusted so that the guide vane 4 is at the appropriate opening angle, allowing the airflow to evenly cover the entire area of ​​the furnace 1. This, combined with the energy replenishment process, promotes the discharge of bubbles in the glass and improves the clarification effect. During the glass forming stage, the output parameters of the three-phase special magnetic adjustment transformer are finely adjusted according to the forming process requirements to maintain a stable glass temperature.

[0038] After molding is completed, first turn off the auxiliary heating system. After the bottom auxiliary electrode cools down, turn off the main melting electric heating system. Keep the variable frequency motor and cooling circulation system running until the temperature of furnace 1 drops to a safe range. Then, turn off the centrifugal impeller 3 motor and pure water circulation unit in sequence, check the status of core components, clean the guide pipe 2, guide plate 6 and electrode surface of the adhering substances, and verify the wear of centrifugal impeller 3 and guide blade 4 to prepare for the next operation.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circulating convection heating glass electric furnace, comprising a furnace (1), characterized in that, The surface of the furnace (1) is equipped with a guide pipe (2). The air inlet end of the guide pipe (2) is equipped with a gas flow conveying assembly driven by a drive component. The air outlet end of the guide pipe (2) is connected to the interior of the furnace (1) along the tangential direction of the furnace (1). The air outlet end of the guide pipe (2) is fixedly connected with a guide plate (6). Two guide vanes (4) are rotatably installed inside the guide pipe (2). The movable end of the guide vane (4) is close to the air outlet end of the guide pipe (2).

2. The circulating convection heating glass electric furnace according to claim 1, characterized in that, The upper and lower walls of the guide tube (2) are rotatably connected to horizontally arranged rotating shafts (7), and one end of each of the two guide blades (4) is fixedly connected to a rotating shaft (7). The guide blades (4) are rotatably connected to the guide tube (2) through the horizontally arranged rotating shafts (7).

3. The circulating convection heating glass electric furnace according to claim 2, characterized in that, The width of the guide vane (4) is adapted to the front and rear spacing of the inner cavity of the guide tube (2).

4. The circulating convection heating glass electric furnace according to claim 2, characterized in that, The upper and lower ends of the guide tube (2) are threaded with adjusting bolts (5), and the two adjusting bolts (5) abut against the back of a guide blade (4) respectively.

5. The circulating convection heating glass electric furnace according to claim 1, characterized in that, The air inlet of the guide pipe (2) is trumpet-shaped, and the inlet diameter matches the outer diameter of the centrifugal impeller (3). The inner diameter gradually shrinks and transitions to the outlet diameter through a smooth arc.

6. The circulating convection heating glass electric furnace according to claim 5, characterized in that, The number of the guide plates (6) is three, which are evenly distributed from top to bottom and the inclination increases sequentially.

7. The circulating convection heating glass electric furnace according to claim 1, characterized in that, The airflow conveying component is a centrifugal impeller (3), and the driving component is a variable frequency motor. The variable frequency motor is connected to the centrifugal impeller (3) through a transmission mechanism.

8. The circulating convection heating glass electric furnace according to claim 4, characterized in that, An elastic reset element is provided between the guide tube (2) and the guide vane (4), and the elastic reset element causes the guide vane (4) to abut against the adjusting bolt (5).

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