Swirl injection type energy-saving annealing furnace

Abstract

The invention relates to the technical field of annealing furnaces, in particular to a swirl injection type energy-saving annealing furnace. The device comprises outer shell plates and an air duct, the outer shell plates are spliced to form a hearth, the air duct is arranged in the outer shell plates to form an air path for convective circulation, the air duct is connected with a circulating fan, and air in the air duct and an inner cavity of the hearth is driven by the circulating fan to actively convectively circulate. The air direction of air convection circulation of the air channel faces the side face and the lower portion of the workpiece needing annealing, and a heat preservation layer is attached to the inner surface of the outer shell plate. The shell plate is used for supporting a main body structure of the furnace body, the air duct is used for achieving circulation convection of air flow, the annealing efficiency and the annealing quality of the metal coiled materials are improved through circulation convection of high-temperature air flow, the heat preservation layer is used for storing internal heat, reducing energy leakage and effectively reducing loss, and the circulation fan is used for providing power for circulation convection of the air flow.

Description

Technical Field

[0001] The invention relates to the technical field of annealing furnaces, in particular to a swirl jet type energy-saving annealing furnace. Background Art

[0002] Annealing is a metal heat treatment process, which means slowly heating the metal to a certain temperature, keeping it for a sufficient time, and then cooling it at an appropriate rate. In a broad sense, annealing is a heat treatment process for materials, including metal materials and non-metallic materials, and annealing furnaces are commonly used equipment for annealing operations, including bell-type, horizontal and tunnel-type styles, which are used for different materials and different industries.

[0003] Annealing of metal coils can effectively release the internal stress of metal coils, improve plasticity and hardness, and facilitate subsequent processing and treatment. Annealing of metal coils requires high-temperature annealing, which requires high-temperature gas circulation to anneal the metal coils. Currently, commonly used metal coil annealing furnaces have problems with uneven annealing temperature and annealing temperature loss. Summary of the invention

[0004] In order to improve the convection uniformity of the annealing high-temperature airflow, improve the annealing quality of the metal coil, and reduce energy loss at the same time, the present invention provides a swirl jet type energy-saving annealing furnace.

[0005] The invention provides a swirl jet type energy-saving annealing furnace adopts the following technical solution: A swirl jet type energy-saving annealing furnace comprises an outer shell plate and an air duct, wherein the outer shell plate is spliced ​​to form a furnace, the air duct is arranged in the outer shell plate to form a convection circulation wind path, a circulating fan is connected to the air duct, and the air in the air duct and the inner cavity of the furnace is actively convectively circulated by the circulating fan, and the wind direction of the air convection circulation of the air in the air duct is toward the side and bottom of the workpiece to be annealed, and an insulation layer is attached to the inner surface of the outer shell plate.

[0006] The outer shell plate is used to support the main structure of the furnace body, the air duct is used to realize the circulation convection of airflow, and the annealing efficiency and quality of metal coils are improved through the circulation convection of high-temperature airflow. The insulation layer is used to preserve internal heat, reduce energy leakage, and effectively reduce losses. The circulating fan is used to provide power for the circulation convection of airflow.

[0007] Furthermore, the air duct blows air toward the side of the workpiece to be annealed through the swirl plate, and the wind blown out of the air duct forms multiple groups of swirl winds after passing through the swirl plate and swirls forward and sprays on the side of the workpiece to be annealed.

[0008] The swirl plate is used to blow out swirl wind, improve the annealing uniformity of the metal coil, and further improve the annealing quality.

[0009] Furthermore, the swirl plates are respectively installed on the two sides of the workpiece to be annealed and blow air towards the sides of the annealed workpiece at the same time. The swirl plates include a substrate, which is installed on the air duct. A wind tunnel is opened on the substrate, and the wind tunnel penetrates and connects the air duct.

[0010] The base plate is used to form a ventilation duct for drainage in conjunction with the swirl plate, and the upward movement of hot air is used to guide the internal airflow into the wind tunnel and circulate.

[0011] Furthermore, the wind tunnels on the substrate are arranged in groups of four at intervals, and the wind tunnels are connected to air ducts. The four air ducts connected to each group of wind tunnels are tilted in a clockwise or counterclockwise direction in sequence to form a swirl nozzle structure.

[0012] The four air ducts are tilted in a clockwise or counterclockwise direction in sequence to form a swirl nozzle structure, which can blow out swirl wind, effectively improve the uniformity of air outlet, and further achieve uniformity of annealing.

[0013] Furthermore, the air ducts are respectively installed on both sides of the furnace cavity wrapped by the outer shell plate, and the substrates on the air ducts on both sides are arranged relatively and combined with the air ducts on both sides to form a group of opposite spray structures, and multiple groups of opposite spray structures are arranged along the depth direction of the furnace.

[0014] The air ducts are installed on both sides of the outer shell plate to realize double-sided ventilation annealing of the annealed parts, effectively improving the annealing uniformity and annealing efficiency.

[0015] Furthermore, the air duct is vertically arranged along both sides of the furnace cavity to form a ventilation duct from top to bottom, and the ventilation direction is that the air enters from the top and then flows downward along the air duct and is split and sprayed into the furnace cavity from the middle and bottom.

[0016] The air ducts spray towards the middle and bottom respectively, further improving the annealing uniformity and annealing efficiency.

[0017] Furthermore, the air duct includes vertical wind cavities vertically arranged on both sides of the furnace inner cavity, the vertical wind cavity is provided with a swirl plate on the side facing the center of the furnace inner cavity and the swirl plate is used to spray internal circulating air toward the middle position of the furnace inner cavity, the top of the vertical wind cavity is connected and installed with a top wind cavity, the top wind cavity introduces the wind blown by the circulating fan into the vertical wind cavity, the bottom of the vertical wind cavity is connected and installed with a bottom wind cavity, the bottom wind cavity draws out the wind in the vertical wind cavity and sprays it horizontally to the bottom of the furnace inner cavity.

[0018] The top air chamber, vertical air chamber and bottom air chamber are assembled in three sections, which is convenient for processing and installation. The swirl plate disperses the airflow evenly and effectively maintains the uniform flow of airflow inside the annealing furnace. The circulating fan accelerates the flow of airflow, which is conducive to active control and accelerated annealing.

[0019] Furthermore, the vertical air cavity is divided into multiple independent ventilation ducts by arranging a baffle plate in the vertical air cavity, the top of each independent ventilation duct in the vertical air cavity is connected to and installed with a top air cavity, the bottoms of the independent ventilation ducts on both sides of the vertical air cavity are connected to and installed with a bottom air cavity, and the bottom of the independent ventilation duct in the middle is closed.

[0020] The air duct is divided into multiple independent ventilation cavities, which is beneficial to the uniformity of ventilation and ensures that the air pressure at various parts of the swirl plate is as uniform as possible. The feeding rail is convenient for feeding and removing metal coils, which is easy to operate. There are air outlets at the ends of the independent ventilation cavities on both sides to achieve blowing at the bottom of the metal coil. The end of the independent ventilation cavity in the middle is closed, which is beneficial to ensure the ventilation pressure of the swirl plate and effectively maintain uniform blowing on the sides and bottom.

[0021] Furthermore, the top air cavity is provided with an air inlet, which faces the circulating fan and receives the circulating air blown out by the circulating fan, and the bottom air cavity is provided with an air outlet, which faces horizontally toward the middle of the bottom of the furnace cavity and supplies air to the bottom of the workpiece to be annealed.

[0022] The top wind cavity is helpful to guide the airflow and realize the airflow turning to flow downward.

[0023] Furthermore, the vertical air cavity is provided with bolt holes and is fixed to the inner surfaces of the outer shell plates on both sides of the furnace by bolts matching the bolt holes. The top air cavity and the vertical air cavity are connected and assembled at the contact seam by sealing strips, and the bottom air cavity and the vertical air cavity are connected and assembled at the contact seam by sealing strips.

[0024] The bolt holes are conducive to the overall installation and fixation, and are convenient for positioning and installation. The sealing strips are used to seal the connecting gaps between the top air cavity, the vertical air cavity and the bottom air cavity, thereby reducing the installation accuracy requirements for the top air cavity, the vertical air cavity and the bottom air cavity and avoiding unstable air pressure caused by gas leakage.

[0025] Furthermore, a heating rod is installed in the air duct, and the heating rod is resistively heated or steam heated. When the heating rod is resistively heated, the heating rod is connected to an external power source, and when the heating rod is steam heated, the heating rod is connected to an external high-temperature steam source.

[0026] The heating rod is used to heat the internal airflow to keep the internal airflow at the temperature required for annealing, thereby improving the controllability and quality of annealing.

[0027] Furthermore, the circulation fan is installed in the middle upper part of the furnace cavity, and the circulating air in the middle of the furnace cavity is drawn out by the front of the circulation fan and then blown into the air duct from the side of the circulation fan.

[0028] The circulating fan drives the air flow and provides the power for the air flow, and at the same time facilitates the control of the air flow velocity to meet the air flow velocity control of different annealing requirements.

[0029] Furthermore, the circulation fan is installed in a fan housing and is installed at the middle top position of the furnace cavity through the fan housing, and the circulation fan is connected to the air duct and the furnace cavity through the fan housing. The fan housing includes a top structural plate and a bottom structural plate, the top structural plate is arranged on the top of the circulation fan, and the bottom structural plate is arranged on the bottom of the circulation fan.

[0030] The top structural plate and the bottom structural plate constitute the main structure of the circulation fan drainage cavity, which maintains the sealing of the airflow, improves the airflow circulation efficiency, and evenly heats the airflow.

[0031] Furthermore, a guide plate is arranged between the top structural plate and the bottom structural plate, and the guide plate surrounds the circulating fan and divides the fan housing into a plurality of radial independent air supply ducts. Each independent air supply duct receives side air supply from the circulating fan at one end and is connected to an independent ventilation duct of an air duct at the other end.

[0032] The guide plate is helpful to evenly disperse the air blown out by the circulation fan into multiple independent ventilation cavities in the air duct.

[0033] Furthermore, a circulation air outlet is opened on the bottom structure plate, and the circulation air outlet is opened directly below the air intake surface of the circulation fan and directly facing the center of the furnace cavity. The top structure plate and the bottom structure plate are connected and fixed to each other through support columns. The top structure plate has a center hole, and the rotating main shaft of the circulation fan passes through the center hole and is externally connected to an electric motor.

[0034] The support column is beneficial to improving the connection strength between the top structural plate and the bottom structural plate. The center hole is convenient for installing the circulating fan and the motor. The motor is installed outside to reduce or avoid the damage to the motor caused by high temperature.

[0035] Furthermore, the outer shell plate includes a top plate, side plates and a bottom plate, the bottom plate is fixed on the ground, the top plate and the bottom plate are arranged correspondingly up and down, the side plates are respectively arranged vertically at both side edges of the top plate and the bottom plate and are combined to form a channel structure, the rear end of the channel structure is closed, and a closed door is installed at the front end of the channel structure and the opening and closing is controlled by the closed door.

[0036] The top plate, side plates and bottom plates are spliced ​​together to facilitate the overall installation and disassembly of the annealing furnace, and the channel structure facilitates the transfer of large and heavy annealing parts into the annealing furnace.

[0037] Furthermore, the top plate, the side plate and the bottom plate are all provided with structural keels, and the structural keels are staggered in horizontal and vertical directions to form a mesh.

[0038] Structural keels increase the strength of the top, side and bottom panels and reduce deformation.

[0039] Furthermore, the insulation layer is formed by splicing a bottom insulation board, a side insulation board and a top insulation board. The insulation layer is a complete insulation sealing structure and tightly wraps the inner cavity of the furnace chamber against the inner side of the outer shell board. A stainless steel cotton pressing plate is fixed on the inner surface of the insulation layer.

[0040] The upper and lower edges of the side insulation panels are tightly connected to the bottom insulation panel and the top insulation panel, respectively, to effectively ensure the integrity of the internal insulation and reduce heat loss at the gaps.

[0041] Furthermore, a feeding rail is installed at the bottom of the furnace cavity, and the feeding rail is extended and laid toward the depth of the furnace cavity, and support frames are installed on both sides of the feeding rail.

[0042] The feeding rail is used to guide the annealing parts to be transferred into the annealing furnace, and the supporting frame is used to keep the annealing parts suspended to avoid uneven heating at the bottom.

[0043] In summary, the present invention has the following beneficial technical effects: 1. The outer shell plate is used to support the main structure of the furnace body. The air duct is used to realize the circulation convection of airflow. The circulation convection of high-temperature airflow improves the annealing efficiency and quality of metal coils. The insulation layer is used to preserve internal heat, reduce energy leakage, and effectively reduce losses. The circulating fan is used to provide power for the circulation convection of airflow.

[0044] 2. The swirl plate is used to blow out swirl wind, improve the annealing uniformity of metal coils, and further improve the annealing quality. The base plate is used to form a drainage ventilation duct in conjunction with the swirl plate. The upward movement of hot air flow is used to guide the internal air flow into the wind tunnel and circulate. The four air ducts are tilted in a clockwise or counterclockwise direction to form a swirl nozzle structure, which can blow out swirl wind, effectively improve the uniformity of air output, and further achieve the uniformity of annealing. The air ducts are installed on both sides of the outer shell plate to realize double-sided ventilation annealing of the annealed parts, effectively improving the uniformity and efficiency of annealing.

[0045] 3. The air duct sprays towards the middle and the bottom respectively, which further improves the uniformity and efficiency of annealing. The top air chamber, vertical air chamber and bottom air chamber are assembled in three sections, which is convenient for processing and installation. The swirl plate disperses the airflow evenly and effectively maintains the uniform flow of airflow inside the annealing furnace. The circulating fan accelerates the flow of air, which is conducive to active control and accelerated annealing. The air duct is divided into multiple independent ventilation cavities, which is conducive to the uniformity of ventilation and ensures that the air pressure at each part of the swirl plate is as uniform as possible. The feeding rail is convenient for feeding and removing metal coils, which is convenient for operation. There are air outlets at the ends of the independent ventilation cavities on both sides to achieve blowing on the bottom of the metal coils. The end of the independent ventilation cavity in the middle is closed, which is conducive to ensuring the ventilation pressure of the swirl plate and effectively maintaining uniform blowing on the sides and bottom. The top air cavity is conducive to guiding the airflow and realizing the airflow turning downward. The bolt holes are conducive to the overall installation and fixation, which is convenient for positioning and installation. The sealing strip is used to seal the connecting gaps between the top air cavity, vertical air cavity and bottom air cavity, reducing the installation accuracy requirements for the top air cavity, vertical air cavity and bottom air cavity, and avoiding unstable air pressure caused by gas leakage. The heating rod is used to heat the internal airflow to keep the internal airflow always at the temperature required for annealing, thereby improving the controllability and quality of annealing.

[0046] 4. The circulating fan drives the airflow and provides the power for the airflow, and at the same time facilitates the control of the airflow velocity to meet the airflow velocity control requirements of different annealing requirements. The top structural plate and the bottom structural plate constitute the main structure of the circulation fan drainage cavity, maintain the sealing of the airflow, improve the airflow circulation efficiency, and evenly heat the airflow. The drainage plate is conducive to evenly dispersing the air blown by the circulating fan to multiple independent ventilation cavities in the air duct. The support column is conducive to improving the connection strength of the top structural plate and the bottom structural plate. The center hole is convenient for installing the circulating fan and the motor. The motor is installed on the outside to reduce or avoid the damage to the motor caused by high temperature.

[0047] 5. The top plate, side plate and bottom plate are spliced ​​with each other to facilitate the overall installation and disassembly of the annealing furnace. The channel structure is convenient for transferring large and heavy annealing parts into the annealing furnace. The structural keel improves the firmness of the top plate, side plate and bottom plate and reduces deformation. The upper and lower edges of the side insulation plate are tightly connected with the bottom insulation plate and the top insulation plate respectively to effectively ensure the integrity of the internal insulation and reduce the loss of heat in the gap. The feeding rail is used to guide the annealing parts to be transferred into the annealing furnace, and the support frame is used to keep the annealing parts suspended to avoid uneven heating at the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the use state of the present invention; Figure 3 It is a schematic cross-sectional view of the central vertical plane of the present invention; Figure 4This is a schematic diagram of a vertical section near the edge of the present invention; Figure 5 for Figure 3 A partial enlarged view of point A.

[0049] Description of reference numerals: 1. Shell plate, 11. Top plate, 110. Structural keel, 12. Side plate, 13. Bottom plate, 2. Insulation layer, 20. Stainless steel cotton pressing plate, 21. Bottom insulation plate, 22. Side insulation plate, 23. Top insulation plate, 3. Air duct, 31. Top air cavity, 310. Baffle plate, 311. Air inlet, 32. Vertical air cavity, 321. Bolt hole, 33. Bottom air cavity, 331. Air outlet, 34. Sealing sheet bar, 35. Heating rod, 4. Circulating fan, 41. Drainage plate, 42. Top structural plate, 421. Center hole, 43. Bottom structural plate, 431. Circulating air outlet, 44. Support column, 5. Swirl plate, 51. Base plate, 511. Wind tunnel, 52. Air duct, 6. Feed rail, 7. Support frame. DETAILED DESCRIPTION

[0050] The following is combined with Figure 1-5 The present invention is described in further detail. Example 1

[0051] The embodiment of the present invention discloses a swirl jet type energy-saving annealing furnace, referring to Figure 1 , comprising an outer shell plate 1 and an air duct 3, wherein the outer shell plate 1 is spliced ​​to form a furnace, the air duct 3 is arranged in the outer shell plate 1 to form a convection circulation wind path, the air duct 3 is connected and installed with a circulation fan 4, the air in the air duct 3 and the inner cavity of the furnace is driven by the circulation fan 4 to actively circulate by convection, and the wind direction of the air convection circulation of the air duct 3 is toward the side and bottom of the workpiece to be annealed; A heat-insulating layer 2 is attached to the inner surface of the outer shell plate 1 .

[0052] When in use, the metal coil is placed in the annealing furnace from one side, the annealing furnace door is closed, and the circulating fan 4 is started to drive the hot air in the insulation layer 2 and the hot air in the air duct 3 to flow. The circulation direction is that the air in the insulation layer 2 is drawn into the top of the air duct 3 by the top circulating fan 4, and then the air duct 3 guides the hot air to blow to the side and bottom of the metal coil.

[0053] Preheat the annealing furnace before use. Example 2

[0054] On the basis of Example 1, add: Reference Figure 1 The air duct 3 blows air toward the side of the workpiece to be annealed through the swirl plate 5. The wind blown out of the air duct 3 forms multiple groups of swirl winds after passing through the swirl plate 5 and swirls forward and sprays on the side of the workpiece to be annealed.

[0055] The air duct 3 uses the swirl plate 5 to blow hot air to the side of the metal coil, and the swirl plate 5 blows swirl wind to the surface of the metal coil.

[0056] Reference Figure 2 , Figure 3 and Figure 5 The swirl plates 5 are respectively installed on the two sides of the workpiece to be annealed and blow air toward the sides of the workpiece to be annealed at the same time. The swirl plates 5 include a substrate 51, which is installed on the air duct 3. A wind tunnel 511 is opened on the substrate 51, and the wind tunnel 511 penetrates and connects to the air duct 3.

[0057] The swirl plate 5 is circular or square.

[0058] Reference Figure 2 and Figure 5 The wind tunnels 511 on the substrate 51 are arranged in groups of four at intervals, and the wind tunnels 511 are connected to air ducts 52. The four air ducts 52 connected to each group of wind tunnels 511 are tilted in a clockwise or counterclockwise direction in sequence to form a swirl nozzle structure.

[0059] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 The air ducts 3 are respectively installed on both sides of the furnace cavity wrapped by the outer shell plate 1, and the substrates 51 on the air ducts 3 on both sides are arranged relatively and combined with the air ducts 3 on both sides to form a group of opposite spray structures, and multiple groups of opposite spray structures are arranged along the depth direction of the furnace. Example 3

[0060] On the basis of Example 1, add: Reference Figure 1 The air duct 3 is vertically arranged along both sides of the furnace cavity to form a ventilation duct from top to bottom. The ventilation direction is that the air enters from the top and then goes downward along the air duct 3 and is split and sprayed into the furnace cavity from the middle and bottom.

[0061] Reference Figure 1-Figure 4 The air duct 3 includes vertical air cavities 32 vertically arranged on both sides of the furnace cavity. The vertical air cavity 32 is provided with a swirl plate 5 on one side facing the center of the furnace cavity and uses the swirl plate 5 to spray internal circulating air toward the middle position of the furnace cavity. The top of the vertical air cavity 32 is connected to and installed with a top air cavity 31. The top air cavity 31 introduces the wind blown by the circulating fan 4 into the vertical air cavity 32. The bottom of the vertical air cavity 32 is connected to and installed with a bottom air cavity 33. The bottom air cavity 33 draws out the wind in the vertical air cavity 32 and sprays it horizontally to the bottom of the furnace cavity.

[0062] When installing the air duct 3, first fix the vertical air cavity 32 to the inner side surface by bolts, then install the top air cavity 31 and the bottom air cavity 33 at the top and bottom respectively, and then use the sealing sheet strip 34 to seal and install; The air ducts 3 are arranged in groups in sequence in the annealing furnace.

[0063] Reference Figure 4 The vertical air cavity 32 is divided into multiple independent ventilation passages by arranging a baffle plate 310. The top of each independent ventilation passage of the vertical air cavity 32 is connected and installed with a top air cavity 31, and the bottoms of the independent ventilation passages on both sides of the vertical air cavity 32 are connected and installed with a bottom air cavity 33, and the bottom of the independent ventilation passage in the middle is closed.

[0064] Reference Figure 3 The top air cavity 31 is provided with an air inlet 311, which faces the circulating fan 4 and receives the circulating air blown out by the circulating fan 4. The bottom air cavity 33 is provided with an air outlet 331, which faces horizontally toward the middle of the bottom of the furnace cavity and supplies air to the bottom of the workpiece to be annealed.

[0065] A filter is installed at the air outlet 331 to filter debris in the flowing air.

[0066] Reference Figure 1-Figure 3 The vertical air cavity 32 is provided with bolt holes 321 and is fixed to the inner surface of the outer shell plate 1 on both sides of the furnace by bolts matching the bolt holes 321. The contact seam between the top air cavity 31 and the vertical air cavity 32 is connected and assembled by a sealing strip 34. The contact seam between the bottom air cavity 33 and the vertical air cavity 32 is connected and assembled by a sealing strip 34.

[0067] Reference Figure 4 A heating rod 35 is installed in the air duct 3. The heating rod 35 is resistive heated or steam heated. When the heating rod 35 is resistive heated, the heating rod 35 is connected to an external power source. When the heating rod 35 is steam heated, the heating rod 35 is connected to an external high-temperature steam source. Example 4

[0068] Reference Figure 1 The circulating fan 4 is installed in the middle upper part of the furnace cavity. The circulating air in the middle of the furnace cavity is extracted by the front of the circulating fan 4 and then blown into the air duct 3 from the side of the circulating fan 4.

[0069] Reference Figure 3 The circulating fan 4 is installed in the fan housing and is installed at the middle top position of the furnace cavity through the fan housing, and the circulating fan 4 is connected to the air duct 3 and the furnace cavity through the fan housing. The fan housing includes a top structure plate 42 and a bottom structure plate 43. The top structure plate 42 is arranged on the top of the circulating fan 4, and the bottom structure plate 43 is arranged on the bottom of the circulating fan 4.

[0070] Reference Figure 3A guide plate 41 is arranged between the top structure plate 42 and the bottom structure plate 43. The guide plate 41 surrounds the circulating fan 4 and divides the fan housing into a plurality of radial independent air supply ducts. Each independent air supply duct receives side air supply from the circulating fan 4 at one end and is connected to an independent ventilation duct of the air duct 3 at the other end.

[0071] The guide plate 41 presents a spiral scattering shape along the wind blowing direction.

[0072] Reference Figure 3 The bottom structure plate 43 is provided with a circulation air port 431, and the circulation air port 431 is provided just below the air intake surface of the circulation fan 4 and directly opposite to the center of the furnace cavity. The top structure plate 42 and the bottom structure plate 43 are connected and fixed to each other through support columns 44. The top structure plate 42 is provided with a center hole 421, and the rotating main shaft of the circulation fan 4 passes through the center hole 421 and is externally connected to a motor. Example 5

[0073] Reference Figure 1 and Figure 2 The outer shell plate 1 includes a top plate 11, a side plate 12 and a bottom plate 13. The bottom plate 13 is fixed on the ground. The top plate 11 and the bottom plate 13 are arranged correspondingly up and down. The side plates 12 are respectively arranged vertically at both sides of the top plate 11 and the bottom plate 13 and are combined to form a channel structure. The rear end of the channel structure is closed, and a closed door is installed at the front end of the channel structure and the opening and closing is controlled by the closed door.

[0074] When the outer shell plate 1 is installed, the bottom plate 13 is first fixed on the ground, and then the side plates 12 are installed by bolts and welding. Then, the top plate 11 is installed on the top surface of the side plates 12 by a hoisting machine and then fixed by bolts and welding.

[0075] Reference Figure 1 and Figure 2 The top plate 11, the side plate 12 and the bottom plate 13 are all provided with structural keels 110, and the structural keels 110 are staggered in horizontal and vertical directions to form a mesh.

[0076] Reference Figure 1-Figure 4 The insulation layer 2 is formed by splicing a bottom insulation board 21, a side insulation board 22 and a top insulation board 23. The insulation layer 2 is a complete insulation sealing structure and tightly adheres to the inner side of the outer shell board 1 to wrap the inner cavity of the furnace. A stainless steel cotton pressing plate 20 is fixed to the inner surface of the insulation layer 2.

[0077] When the insulation layer 2 is laid and filled, the bottom insulation board 21 and the top insulation board 23 are first installed, laid and fixed, and then the side insulation board 22 is installed, laid and fixed.

[0078] Reference Figure 1-Figure 4A feeding rail 6 is installed at the bottom of the furnace cavity. The feeding rail 6 extends and is laid toward the depth of the furnace cavity. Support frames 7 are installed on both sides of the feeding rail 6.

[0079] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A swirl jet type energy-saving annealing furnace, comprising a shell plate (1) and an air duct (3), wherein the shell plate (1) is spliced ​​to form a furnace chamber, and the air duct (3) is arranged in the shell plate (1) to form a convection circulation air path, characterized in that: The air duct (3) is connected to a circulating fan (4), and the air in the air duct (3) and the inner cavity of the furnace is driven by the circulating fan (4) to actively circulate in convection, and the wind direction of the air convection circulation of the air in the air duct (3) is toward the side and bottom of the workpiece to be annealed; A thermal insulation layer (2) is attached to the inner surface of the outer shell plate (1).

2. The swirl jet type energy-saving annealing furnace according to claim 1, characterized in that: The air duct (3) blows air toward the side of the workpiece to be annealed through the swirl plate (5); the air blown out of the air duct (3) passes through the swirl plate (5) to form multiple groups of swirl winds, which swirl forward and are sprayed onto the side of the workpiece to be annealed.

3. The swirl jet type energy-saving annealing furnace according to claim 2, characterized in that: The swirl plates (5) are respectively mounted on two side surfaces of a workpiece to be annealed and blow air towards the side surfaces of the workpiece to be annealed at the same time. The swirl plates (5) comprise a base plate (51), the base plate (51) being mounted on the air duct (3), a wind tunnel (511) being formed on the base plate (51), and the wind tunnel (511) passing through and connected to the air duct (3).

4. The swirl jet type energy-saving annealing furnace according to claim 3, characterized in that: The wind tunnels (511) on the base plate (51) are arranged in groups of four at intervals, and the wind tunnels (511) are connected to air ducts (52). The four air ducts (52) connected to each group of wind tunnels (511) are tilted in a clockwise or counterclockwise direction in sequence to form a swirl nozzle structure.

5. A cyclone jet type energy-saving annealing furnace according to claim 3 or 4, characterized in that: The air ducts (3) are respectively installed on both sides of the furnace inner cavity wrapped by the outer shell plate (1), and the base plates (51) on the air ducts (3) on both sides are arranged relative to each other and combined with the air ducts (3) on both sides to form a group of opposite spray structures, and multiple groups of opposite spray structures are arranged along the depth direction of the furnace.

6. A swirl jet type energy-saving annealing furnace according to claim 1, 2 or 3, characterized in that: The air duct (3) is vertically arranged along both sides of the furnace inner cavity to form a ventilation duct from top to bottom, and the ventilation direction is that the air enters from the top and then flows downward along the air duct (3) and is split and sprayed into the furnace inner cavity from the middle and bottom.

7. The swirl jet type energy-saving annealing furnace according to claim 6, characterized in that: The air duct (3) comprises vertical air chambers (32) arranged vertically on both sides of the furnace inner cavity; the vertical air chamber (32) is provided with a swirl plate (5) on one side facing the center of the furnace inner cavity and uses the swirl plate (5) to spray internal circulating air toward the middle of the furnace inner cavity; the top of the vertical air chamber (32) is connected to and installed with a top air chamber (31); the top air chamber (31) introduces air blown by a circulating fan (4) into the vertical air chamber (32); the bottom of the vertical air chamber (32) is connected to and installed with a bottom air chamber (33); the bottom air chamber (33) draws out air in the vertical air chamber (32) and sprays it horizontally to the bottom of the furnace inner cavity.

8. The swirl jet type energy-saving annealing furnace according to claim 7, characterized in that: The vertical air cavity (32) is divided into a plurality of independent ventilation passages by arranging a baffle plate (310) in the vertical air cavity (32); the top of each independent ventilation passage of the vertical air cavity (32) is connected to and installed with a top air cavity (31); the bottoms of the independent ventilation passages on both sides of the vertical air cavity (32) are connected to and installed with a bottom air cavity (33); and the bottom of the independent ventilation passage in the middle is closed.

9. A cyclone jet type energy-saving annealing furnace according to claim 7 or 8, characterized in that: The top air cavity (31) is provided with an air inlet (311), the air inlet (311) faces the circulating fan (4) and receives circulating air blown out by the circulating fan (4), and the bottom air cavity (33) is provided with an air outlet (331), the air outlet (331) faces laterally toward the middle of the bottom of the furnace inner cavity and supplies air to the bottom of the workpiece to be annealed.

10. A swirl jet type energy-saving annealing furnace according to claim 7 or 8, characterized in that: The vertical air chamber (32) is provided with bolt holes (321) and is fixed to the inner surfaces of the outer shell plates (1) on both sides of the furnace by bolts matching the bolt holes (321); the top air chamber (31) and the vertical air chamber (32) are connected and assembled at the contact seam by a sealing strip (34); and the bottom air chamber (33) and the vertical air chamber (32) are connected and assembled at the contact seam by a sealing strip (34).

11. The swirl jet type energy-saving annealing furnace according to claim 6, characterized in that: A heating rod (35) is installed in the air duct (3). The heating rod (35) is resistively heated or steam heated. When the heating rod (35) is resistively heated, the heating rod (35) is externally connected to a power source. When the heating rod (35) is steam heated, the heating rod (35) is externally connected to a high-temperature steam source.

12. The cyclone jet type energy-saving annealing furnace according to claim 1, characterized in that: The circulating fan (4) is installed in the middle upper part of the furnace cavity, and the circulating air in the middle of the furnace cavity is drawn out from the front of the circulating fan (4) and then blown into the air duct (3) from the side of the circulating fan (4).

13. The swirl jet type energy-saving annealing furnace according to claim 12, characterized in that: The circulation fan (4) is installed in a fan housing and is installed at a middle top position of the furnace inner cavity through the fan housing, and the circulation fan (4) is connected to the air duct (3) and the furnace inner cavity through the fan housing, and the fan housing comprises a top structural plate (42) and a bottom structural plate (43), wherein the top structural plate (42) is arranged at the top of the circulation fan (4), and the bottom structural plate (43) is arranged at the bottom of the circulation fan (4).

14. The swirl jet type energy-saving annealing furnace according to claim 13, characterized in that: A guide plate (41) is provided between the top structural plate (42) and the bottom structural plate (43); the guide plate (41) surrounds the circulating fan (4) and divides the fan housing into a plurality of radial independent air supply passages; each independent air supply passage is an independent ventilation passage with one end facing the circulating fan (4) and receiving air supplied from the side of the circulating fan (4), and the other end connected to an air duct (3).

15. A cyclone jet type energy-saving annealing furnace according to claim 13 or 14, characterized in that: The bottom structure plate (43) is provided with a circulation air port (431), the circulation air port (431) is provided directly below the air intake surface of the circulation fan (4) and directly facing the center of the furnace inner cavity, the top structure plate (42) and the bottom structure plate (43) are connected and fixed to each other via a support column (44), the top structure plate (42) is provided with a center hole (421), and the main rotating shaft of the circulation fan (4) passes through the center hole (421) and is externally connected to a motor.

16. The cyclone jet type energy-saving annealing furnace according to claim 1, characterized in that: The outer shell plate (1) comprises a top plate (11), a side plate (12) and a bottom plate (13); the bottom plate (13) is fixed on the ground; the top plate (11) and the bottom plate (13) are arranged correspondingly up and down; the side plates (12) are respectively arranged vertically at both sides of the top plate (11) and the bottom plate (13) and are combined to form a channel structure; the rear end of the channel structure is closed; and a closed door is installed at the front end of the channel structure and is opened and closed by the closed door.

17. The swirl jet type energy-saving annealing furnace according to claim 16, characterized in that: The top plate (11), the side plate (12) and the bottom plate (13) are all provided with structural keels (110), and the structural keels (110) are arranged in a mesh shape by being staggered in horizontal and vertical directions.

18. The swirl jet type energy-saving annealing furnace according to claim 1, characterized in that: The thermal insulation layer (2) is formed by splicing a bottom thermal insulation board (21), a side thermal insulation board (22) and a top thermal insulation board (23); the thermal insulation layer (2) is a complete thermal insulation sealing structure and is tightly attached to the inner side of the outer shell board (1) to wrap around the inner cavity of the furnace; a stainless steel cotton pressing board (20) is fixed to the inner surface of the thermal insulation layer (2).

19. The swirl jet type energy-saving annealing furnace according to claim 1, characterized in that: A feeding rail (6) is installed at the bottom of the furnace inner cavity, and the feeding rail (6) is extended and laid toward the depth of the furnace inner cavity, and support frames (7) are installed on both sides of the feeding rail (6).

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