Impeller blade for a full-hydrogen strong convection cover type annealing furnace base fan

Abstract

The application is a kind of impeller blade for full hydrogen strong convection cover type annealing furnace platform fan, which is used to increase the heat obtained by steel coil during the use of full hydrogen strong convection cover type annealing furnace. The blade body of the impeller blade for full hydrogen strong convection cover type annealing furnace platform fan includes vertical flat piece and curved piece, and the curved piece is connected to the upper side of the vertical flat piece. The rear surface of the curved piece is part of a conical surface, and the front surface is parallel to the rear surface. The generatrix of the conical surface is the intersection line of the rear surface of the vertical flat piece and the rear surface of the curved piece. The apex of the conical surface is located between the center line of the impeller and the intersection line. The rotation axis of the conical surface is arranged on the plane perpendicular to the vertical flat piece, and the rotation axis is located behind the curved piece. The optimization design of the structure of the impeller blade makes the impeller meet the requirements of fluid mechanics, high speed and high temperature. In full hydrogen atmosphere, the air volume can reach 60000m 3 / h.

Description

Technical Field

[0001] This invention relates to the field of fan technology, specifically to an impeller blade for a fan used in a full-hydrogen high-convection hood type annealing furnace platform. Background Technology

[0002] The all-hydrogen forced convection annealing furnace is based on the theory of fluid dynamics and heats steel coils through radiative and convective heat transfer. The amount of heat received by the steel coil depends on the radiative and convective heat transfer capabilities of the inner shroud. However, increasing radiative heat transfer requires raising the temperature of the inner shroud, creating a significant temperature difference. This inevitably leads to overheating of the outer ring of the steel coil. Therefore, increasing the amount of heat received by the steel coil by improving radiative heat transfer has certain limitations.

[0003] The furnace platform fan impeller is the foundation of strong convection technology and an important component of the bell-type annealing furnace. Its blade type directly affects the fan efficiency and the safe and stable operation of the fan, and is the core of strong convection technology.

[0004] Based on this, it is necessary to invent an impeller blade for the furnace platform fan of a full hydrogen strong convection hood annealing furnace. Under the condition of a certain motor power, by increasing the gas flow rate, the convective heat transfer speed is enhanced, and the heat on the inner hood is transferred to the steel coil as quickly as possible. Summary of the Invention

[0005] In order to increase the heat received by steel coils when using a full hydrogen strong convection hood annealing furnace, the present invention provides an impeller blade for the furnace platform fan of a full hydrogen strong convection annealing furnace.

[0006] This invention is achieved using the following technical solution:

[0007] An impeller blade for a blower of a full-hydrogen high-convection hood type annealing furnace includes a blade body, the blade body comprising a vertical flat blade and a curved blade, the curved blade being connected to the upper side of the vertical flat blade; the rear surface of the curved blade is part of a conical surface, and its front surface is parallel to its rear surface; the generatrix of the conical surface is the intersection line of the rear surface of the vertical flat blade and the rear surface of the curved blade, and the extension line of the intersection line intersects the center line of the impeller, the vertex of the conical surface being located between the center line of the impeller and the intersection line; the rotation axis of the conical surface is disposed on a plane perpendicular to the vertical flat blade, and the rotation axis is located behind the curved blade, such that the arc direction of the curved blade is consistent with the rotation direction of the impeller.

[0008] This invention provides a novel impeller blade for a blower in a full-hydrogen high-convection hood-type annealing furnace. The curved blade is formed by a conical arc surface. The optimized arc shape generates a large backward pressure head and high efficiency. More gas enters the blower from the top, forming a large gas flow rate for circulating convection.

[0009] During operation, the impeller rotates counterclockwise, causing the arc of the curved blade to align with the direction of the impeller's rotation.

[0010] Furthermore, the vertex angle of the conical surface is α, and the value of α ranges from 10° to 20°.

[0011] Furthermore, the angle between the intersecting line and the vertical line located below it is β, and the value of β ranges from 90° to 100°.

[0012] Furthermore, the end of the vertical blade away from the center of the impeller is integrally provided with a folded edge, and the folded edge is located on the front side of the blade body.

[0013] Preferably, the height of the folded edge is less than the height of the vertical flat piece, and the folded edge and the arc-shaped edge of the curved piece are connected through the upper arc-shaped edge of the vertical flat piece.

[0014] Furthermore, the vertical flat sheet and the curved sheet are integrally structured.

[0015] Furthermore, the rear surface of the curved piece is a curved surface formed by rotating γ around the axis of rotation with the intersecting line as the generatrix, and γ is less than 45°.

[0016] Furthermore, the upper part of the blade body is provided with an inner plate that is fixedly attached to its rear surface and an outer plate that is fixedly attached to its front surface and located near the center of the impeller. The length of the inner plate along the radial direction of the impeller is the same as the length of the blade body along the radial direction of the impeller, and the area of ​​the inner plate is larger than the area of ​​the curved blade. The upper edge of the inner plate and the upper edge of the outer plate are both flush with the upper edge of the blade body.

[0017] The inner lining can effectively increase the strength of the bent sheet.

[0018] Furthermore, the forming process of the impeller blades is achieved through the following steps:

[0019] Step S1: Machining a blade body sheet metal part that matches the blade body size, machining an inner panel sheet metal part that matches the inner panel size, and machining an outer panel sheet metal part that matches the outer panel size.

[0020] Step S2: Position and weld the blade body sheet metal part and the inner plate sheet metal part on the welding mold to form the blade sheet metal part;

[0021] Step S3: Install a die on the press and install a punch located below the die on the die holder of the press. The lower surface of the die matches the shape of the outer arc surface of the bending sheet, and the upper surface of the punch matches the surface shape of the inner plate. The lower groove of the die and the upper part of the punch are both quarter cones.

[0022] Step S4: Install the blade sheet metal part on the press, so that the part of the blade sheet metal part to be bent is located between the die and the punch; use the press to bend and form the blade sheet metal part, thereby realizing the bending and forming of the blade body and the inner plate.

[0023] Step S5: Install the outer panel sheet metal part onto the press, so that the part of the outer panel sheet metal part to be bent is located between the die and the punch; use the press to bend and form the outer panel sheet metal part, thereby realizing the bending and forming of the outer panel.

[0024] Step S6: Position and weld the outer plate to the blade body on the welding mold, thereby completing the forming process of the impeller blade.

[0025] The airfoil shape of the impeller blade described in this invention is formed using the above method. During the forming process, the generatrix of the conical surface and the vertical plane passing through the apex of the conical surface serve as the forming reference. The lower surface of the die is obtained by offsetting the upper surface of the punch by one blade steel plate thickness, and extends tangentially into a fan-shaped guide surface.

[0026] After the impeller blades are formed, the finished impeller blades need to be weighed, with a deviation of no more than 5g per group. Finally, the selected blades are welded to the impeller front ring, impeller rear disc, and impeller hub according to the impeller assembly welding requirements to form the fan impeller. This part of the operation is carried out using existing technology.

[0027] The forming and processing method described in this invention makes it easy to adjust the blade parameters through the mold, thereby affecting the operating parameters of the wind turbine. It is a reliable and economical method for forming such wind turbine blades.

[0028] This invention optimizes the impeller blade structure by adjusting the apex angle of the conical surface, the tilt angle of the curved blades (i.e., the angle β between the intersecting line and the vertical line below it), and the position of the cone apex angle. This alters the impeller's operating parameters, enabling it to meet the requirements of hydrodynamics, high speed, and high temperature. In a full hydrogen atmosphere, the airflow can reach 60,000 m³ / h. 3 / h. This invention can meet the requirements of the hot air blower under furnace operating conditions.

[0029] In this invention, the optimal determination of the apex angle of the conical surface, the inclination angle of the bent plate, and the position of the apex angle of the cone is based on the output air volume requirements of the furnace circulation conditions. The optimal apex angle of the conical surface, the inclination angle of the bent plate, and the position of the apex angle of the cone are matched, and the mold base is designed based on the inclination angle of the bent plate. The specific process includes: based on the operating parameters of the bell-type furnace fan impeller, including flow rate (m³ / s),... 3The impeller's operating environment was simulated using flow simulation modeling, which included parameters such as airflow rate ( / h), pressure (Pa), temperature (°C), and fan speed (r / min). The impact of different blade parameters on flow rate was calculated, the stress distribution on the blades was analyzed, and the optimal airfoil matching value was found. Based on this, a mold was designed and a prototype was produced for verification. In practical applications, the impeller using this type of blade fully meets production requirements under the designed operating conditions.

[0030] The present invention has a reasonable and reliable structural design, and has the advantages of simple molding principle, adjustable parameters, reliable operation, and easy mold manufacturing. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 yes Figure 1 Rear view diagram;

[0033] Figure 3 yes Figure 1 A side view diagram;

[0034] Figure 4 This is a reference diagram showing the state of the present invention when it is assembled with the impeller;

[0035] Figure 5 This is a schematic diagram of the blade body in this invention;

[0036] Figure 6 yes Figure 5 A top-down view;

[0037] Figure 7 yes Figure 5 A schematic diagram of direction A;

[0038] Figure 8 This is a reference diagram showing the state of the blade sheet metal part during bending and forming in this invention;

[0039] Figure 9 This is a reference diagram showing the initial installation state of the die and punch in this invention;

[0040] Figure 10 yes Figure 9 A side view diagram.

[0041] In the figure, 1-vertical flat plate, 2-bent plate, 3-intersecting line, 4-center line of impeller, 5-rotating shaft, 6-folded edge, 7-inner plate, 8-outer plate, 9-die, 10-die base, 11-punch. Detailed Implementation

[0042] Example 1

[0043] An impeller blade for a blower of a full-hydrogen high-convection hood type annealing furnace, as shown in the attached image. Figure 1 -Appendix Figure 7 As shown, the impeller includes a blade body comprising a vertical flat blade 1 and a curved blade 2, with the curved blade 2 connected to the upper side of the vertical flat blade 1. The rear surface of the curved blade 2 is part of a conical surface, and its front surface is parallel to its rear surface. The generatrix of the conical surface is the intersection line 3 of the rear surface of the vertical flat blade 1 and the rear surface of the curved blade 2, and the extension of the intersection line 3 intersects the center line 4 of the impeller. The vertex of the conical surface is located between the center line 4 of the impeller and the intersection line 3. The rotation axis 5 of the conical surface is disposed on a plane perpendicular to the vertical flat blade 1, and the rotation axis 5 is located behind the curved blade 2, such that the arc direction of the curved blade 2 is consistent with the rotation direction of the impeller.

[0044] As attached Figure 7 As shown, the apex angle of the conical surface is 10°.

[0045] As attached Figure 5 As shown, the angle between the intersecting line 3 and the vertical line located below it is 90°.

[0046] As attached Figure 1 Appendix Figure 2 Appendix Figure 5 -Appendix Figure 7 As shown, the end of the vertical flat blade 1 away from the center of the impeller is integrally provided with a folded edge 6, and the folded edge 6 is located on the front side of the blade body.

[0047] The vertical flat plate 1 and the curved plate 2 are integrally structured.

[0048] The rear surface of the curved piece 2 is a curved surface formed by rotating 5° around the axis of rotation with the intersecting line 3 as the generatrix.

[0049] As attached Figure 1 -Appendix Figure 4 As shown, the upper part of the blade body is provided with an inner plate 7 that is fixedly attached to its rear surface and an outer plate 8 that is fixedly attached to its front surface and located near the center of the impeller. The length of the inner plate 7 along the impeller radial direction is the same as the length of the blade body along the impeller radial direction, and the area of ​​the inner plate 7 is larger than the area of ​​the curved blade 2. The upper edge of the inner plate 7 and the upper edge of the outer plate 8 are both flush with the upper edge of the blade body.

[0050] The forming process of the impeller blades is achieved through the following steps:

[0051] Step S1: Machining a blade body sheet metal part that matches the blade body size, machining an inner panel sheet metal part that matches the inner panel 7 size, and machining an outer panel sheet metal part that matches the outer panel 8 size.

[0052] Step S2: Position and weld the blade body sheet metal part and the inner plate sheet metal part on the welding mold to form the blade sheet metal part;

[0053] Step S3: Install the die 9 on the press, and install the punch 11 located below the die 9 on the die holder 10 of the press. The lower surface of the die 9 matches the shape of the outer arc surface of the bending piece 2, and the upper surface of the punch 11 matches the surface shape of the inner plate 7. The lower groove of the die 9 and the upper part of the punch 11 are both quarter-cones. (See attached...) Figure 9 Appendix Figure 10 As shown;

[0054] Step S4: Install the blade sheet metal part onto the press, so that the part to be bent is located between the die 9 and the punch 11; use the press to bend and form the blade sheet metal part, thereby achieving the bending and forming of the blade body and the inner plate 7; as shown in the attached... Figure 8 As shown;

[0055] Step S5: Install the outer panel sheet metal part on the press, so that the part of the outer panel sheet metal part to be bent is located between the die 9 and the punch 11; use the press to bend and form the outer panel sheet metal part, thereby realizing the bending and forming of the outer panel 8.

[0056] Step S6: Position and weld the outer plate 8 to the blade body on the welding mold, thereby completing the forming process of the impeller blade.

[0057] Example 2

[0058] The apex angle of the conical surface is 20°.

[0059] The angle between the intersecting line 3 and the vertical line located below it is 100°.

[0060] The rear surface of the curved piece 2 is a curved surface formed by rotating 44° with the intersecting line 3 as the generatrix and the rotation axis 5 as the rotation center.

[0061] The rest of this embodiment is the same as that of Embodiment 1.

[0062] Example 3

[0063] The apex angle of the conical surface is 14°.

[0064] The angle between the intersecting line 3 and the vertical line located below it is 95°.

[0065] The rear surface of the curved piece 2 is a curved surface formed by rotating 20° with the intersecting line 3 as the generatrix and the rotation axis 5 as the rotation center.

[0066] The rest of this embodiment is the same as that of Embodiment 1.

[0067] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0068] 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. An impeller blade for a blower of a full-hydrogen high-convection hood type annealing furnace, characterized in that: The blade body includes a vertical flat blade (1) and a curved blade (2), with the curved blade (2) connected to the upper side of the vertical flat blade (1). The rear surface of the curved blade (2) is part of a conical surface, and the front surface is parallel to its rear surface. The generatrix of the conical surface is the intersection line (3) of the rear surface of the vertical flat blade (1) and the rear surface of the curved blade (2), and the extension of the intersection line (3) intersects the center line (4) of the impeller. The vertex of the conical surface is located between the center line (4) of the impeller and the intersection line (3). The rotation axis (5) of the conical surface is set on a plane perpendicular to the vertical flat blade (1), and the rotation axis (5) is located behind the curved blade (2), so that the arc direction of the curved blade (2) is consistent with the rotation direction of the impeller.

2. The impeller blade for the furnace slab fan of a full-hydrogen high-convection hood type annealing furnace according to claim 1, characterized in that: The vertex angle of the conical surface is α, and the value of α ranges from 10° to 20°.

3. The impeller blade for the furnace slab fan of a full-hydrogen high-convection hood type annealing furnace according to claim 1, characterized in that: The angle between the intersecting line (3) and the vertical line located below it is β, and the value of β ranges from 90° to 100°.

4. The impeller blade for the furnace slab fan of a full-hydrogen high-convection hood type annealing furnace according to claim 1, characterized in that: The vertical flat blade (1) has an integrally formed folded edge (6) at the end away from the impeller center, and the folded edge (6) is located on the front side of the blade body.

5. The impeller blade for a blower of a full-hydrogen high-convection hood type annealing furnace according to claim 1, characterized in that: The vertical flat piece (1) and the curved piece (2) are integrally structured.

6. The impeller blade for the furnace slab fan of a full-hydrogen high-convection hood type annealing furnace according to claim 1, characterized in that: The rear surface of the curved piece (2) is a curved surface formed by rotating γ with the intersecting line (3) as the generatrix and the rotation axis (5) as the rotation center, and γ is less than 45°.

7. The impeller blade for a furnace slab fan of a full-hydrogen high-convection hood type annealing furnace according to claim 1, characterized in that: The upper part of the blade body is provided with an inner plate (7) that is fixedly attached to its rear surface and an outer plate (8) that is fixedly attached to its front surface and located near the center of the impeller. The length of the inner plate (7) along the impeller radial direction is the same as the length of the blade body along the impeller radial direction, and the area of ​​the inner plate (7) is larger than the area of ​​the curved blade (2). The upper edge of the inner plate (7) and the upper edge of the outer plate (8) are both flush with the upper edge of the blade body.

8. The impeller blade for a furnace slab fan of a full-hydrogen high-convection hood type annealing furnace according to claim 7, characterized in that: The forming process of the impeller blades is achieved through the following steps: Step S1: Process the blade body sheet metal part that matches the blade body size, process the inner plate sheet metal part that matches the inner plate (7) size, and process the outer plate sheet metal part that matches the outer plate (8) size. Step S2: Position and weld the blade body sheet metal part and the inner plate sheet metal part on the welding mold to form the blade sheet metal part; Step S3: Install the die (9) on the press and install the punch (11) located below the die (9) on the die holder (10) of the press. The lower surface of the die (9) matches the shape of the outer arc surface of the bending piece (2), and the upper surface of the punch (11) matches the surface shape of the inner plate (7). The lower groove of the die (9) and the upper part of the punch (11) are both quarter cones. Step S4: Install the blade sheet metal part on the press, so that the part of the blade sheet metal part to be bent is located between the die (9) and the punch (11); use the press to bend and form the blade sheet metal part, thereby realizing the bending and forming of the blade body and the inner plate (7). Step S5: Install the outer panel sheet metal part on the press, so that the part of the outer panel sheet metal part to be bent is located between the die (9) and the punch (11); use the press to bend and form the outer panel sheet metal part, thereby realizing the bending and forming of the outer panel (8). Step S6: Position and weld the outer plate (8) to the blade body on the welding mold, thereby completing the forming process of the impeller blade.

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