Radiator air cooling impeller and electric locomotive provided with same

Abstract

The utility model discloses a radiator air cooling impeller and an electric locomotive provided with the radiator air cooling impeller, belongs to the field of heat dissipation, and aims to reasonably configure blades made of lightweight materials on the impeller and further improve the shapes of the blades so as to improve the air cooling efficiency and reduce the energy consumption. The rear edge of the lower end face of the airfoil blade is arranged on the circumference of the circular bottom plate, the connecting line of the circle center of the circular bottom plate and the front edge of the airfoil blade is a first dividing line, and the connecting line of the circle center of the circular bottom plate and the rear edge of the airfoil blade is a second dividing line. And a first distance is formed between the front edge of the latter airfoil blade and the second division line of the former airfoil blade and points to the gravity center position of the former airfoil blade.

Description

Technical Field

[0001] The utility model belongs to the field of heat dissipation and relates to an air-cooled impeller of a radiator and an electric locomotive on which the impeller is installed. Background Art

[0002] During the operation of a locomotive powered by electric energy, its transformer and converter will generate a lot of heat. In order to ensure the normal operation and safety of the locomotive, the heat needs to be dissipated in time. For this reason, the fan of the electric locomotive is installed in the oil-water cooling tower to provide cold air for the cooling tower radiator. In this way, the fan dissipates the heat generated by the converter and transformer, ensuring that the locomotive can maintain good working condition in a high temperature environment or after long-term operation. In addition, the application of such fans is not limited to electric locomotives, but also plays an important role in other fields such as power stations, petrochemicals, textiles, etc., and is even an indispensable device. By dissipating the generated heat, the quality of production equipment and products is guaranteed.

[0003] The fan provides cold air to the cooling tower radiator, effectively dissipating the heat generated during the operation of electric locomotives, etc., to ensure safe and reliable operation. The performance of the fan's air-cooled impeller is greatly related to the overall air-cooling efficiency and energy utilization, and is one of the core components that is easily overlooked but very important. Traditional air-cooled impellers made of metal are manufactured through forging, sheet metal, welding and other processes. Because the impeller with metal blades is heavy, has a high moment of inertia, a high rotational load, and low energy efficiency, it cannot better meet the requirements of lightweight and high efficiency.

[0004] With the development of carbon fiber composite materials, they have the advantages of high strength and light weight, and can be used as a preferred alternative to metal blades. However, the existing impeller structure is designed based on metal materials, and the blades and blade installation are designed with welding performance and mechanical processing feasibility as the main purpose. It is not suitable for carbon fiber composite materials. In order to adapt to the new impeller material system, the system structure needs to be redesigned to achieve better impeller effects. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a radiator air-cooled impeller in a first aspect, reasonably arranges blades made of lightweight materials on the impeller, and further improves the shape of the blades to improve air cooling efficiency and reduce energy consumption.

[0006] According to some embodiments of the present application, a radiator air-cooling impeller includes:

[0007] A circular bottom plate, wherein a first opening is arranged at the center of the circular bottom plate;

[0008] A circular top plate, wherein the circular bottom plate and the circular top plate are arranged opposite to each other in a first direction, and a second opening is arranged at the center of the circular top plate;

[0009] Blades, the blades comprising a plurality of airfoil blades, the lower end surfaces of the airfoil blades being connected to the circular bottom plate, and the upper end surfaces of the airfoil blades being correspondingly connected to the circular top plate;

[0010] Among them, the leading edge of the lower end surface of the airfoil blade is arranged on the circular bottom plate, and the trailing edge of the lower end surface of the airfoil blade is arranged on the circumference line of the circular bottom plate. The line connecting the center of the circular bottom plate and the leading edge of the airfoil blade is the first dividing line, and the line connecting the center of the circular bottom plate and the trailing edge of the airfoil blade is the second dividing line. There is a first distance between the leading edge of the rear airfoil blade and the second dividing line of the front airfoil blade, and points to the center of gravity position of the front airfoil blade.

[0011] According to a radiator air-cooled impeller in some embodiments of the present application, the leading edge endpoint of the lower end surface of the airfoil blade coincides with the first point on the circular bottom plate, the trailing edge endpoint coincides with the second point on the circular bottom plate, and the chord of the lower end surface of the airfoil blade coincides with the first connecting line, which is the connecting line between the first point and the second point.

[0012] According to a radiator air-cooled impeller in some embodiments of the present application, the circular base plate is constructed to be virtually divided into seven equal parts with equal central angles, the dividing line is the first dividing line, the intersection of the first dividing line and the concentric circle of the first radius on the circular base plate is the first position point, the first radius is smaller than the radius of the circular base plate, the first dividing line is rotated 45° counterclockwise to form a second dividing line, the intersection of the second dividing line and the circumference line of the circular base plate is the second position point, and the angle between the second dividing line and the first connecting line is 41°.

[0013] According to a radiator air-cooling impeller in some embodiments of the present application, the first position is arranged at the radial center position of the circular bottom plate.

[0014] According to a radiator air-cooled impeller in some embodiments of the present application, a plurality of screw holes for installing the rotating shaft are arranged at intervals on the circular bottom plate along the edge of the first opening, the screw rods of the rotating shaft are installed in the screw holes, and the screw rods are fixed to the circular bottom plate by nuts.

[0015] According to a radiator air-cooled impeller in some embodiments of the present application, the maximum curvature of the mid-arc line of the cross-section of the airfoil blade is 6.0% of the chord length, the maximum arc height of the mid-arc line of the cross-section of the airfoil blade is at a position of 30.0% of the chord length, and the maximum thickness of the cross-section of the airfoil blade is 6.0% of the chord length.

[0016] According to a radiator air-cooled impeller in some embodiments of the present application, the second opening is an opening of a concentric circle of a second radius, and the opening of the concentric circle of the second radius is formed along the circumference of a concentric circle of a third radius on the circular top plate with a trend of gradually reducing the radius, so that the circular top plate gradually bulges toward the first direction until the radius of the concentric circle formed by the bulge is the second radius, forming an opening for the concentric circle of the second radius.

[0017] According to a radiator air-cooled impeller in some embodiments of the present application, the radius of the concentric circle formed by the protrusion is a second radius, and the concentric circle of the second radius is used to make the circular top plate continue to protrude a second distance in the first direction, forming an opening for the concentric circle of the second radius at the first distance.

[0018] According to a radiator air-cooling impeller in some embodiments of the present application, the blades are carbon fiber composite material blades.

[0019] According to an electric locomotive in some embodiments of the present application, the electric locomotive is equipped with any one of the radiator air-cooled impellers described above.

[0020] Beneficial effects:

[0021] In a first aspect, the blade of the utility model is constructed in a streamlined airfoil shape, and can operate at a higher aerodynamic efficiency, while reducing the generation of turbulence and eddies, and can reduce operating noise.

[0022] On the second aspect, the maximum curvature, maximum arc height and maximum thickness distribution of the airfoil blade of the utility model belong to the molding of large curvature variable thickness components, which can increase the cross-sectional area and provide the blade with good strength and rigidity. The use of carbon fiber composite materials allows the blade to still have a lower weight, thereby providing the blade with good mechanical strength and vibration characteristics.

[0023] On the third side, blades made of lightweight carbon fiber composite materials can be installed on the impeller in the arrangement of the present invention to construct airfoil blades with an offset center of gravity and an increased cross-sectional area, so that the center of gravity of the blades is unobstructed and on the windward side, which can increase the lift coefficient and thus optimize the lift-to-drag ratio.

[0024] Fourthly, the reduced weight of the blades reduces the moment of inertia, reduces starting current and energy loss, improves energy efficiency, and is more low-carbon and environmentally friendly.

[0025] Fifthly, carbon fiber has extremely strong corrosion resistance and adaptability to temperature and humidity.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram illustrating the structure of an airfoil blade.

[0028] Figure 2 is a schematic diagram of an airfoil blade in an embodiment.

[0029] Figure 3 is a cross-sectional view of an airfoil blade in an embodiment.

[0030] Figure 4 is a first schematic diagram of an impeller in an embodiment.

[0031] Figure 5 is a second schematic diagram of an impeller in an embodiment.

[0032] Figure 6 It is a top view of the impeller without the circular top plate.

[0033] Figure 7 Schematic diagram of the arrangement of airfoil blades in the embodiment.

[0034] Reference numerals:

[0035] 10. Circular bottom plate, 11. First opening, 12. Center of circle, 13. First point, 14. Second point, 15. First dividing line, 16. Second dividing line, 17. First connecting line.

[0036] 20. Circular top plate, 21. Second opening.

[0037] 30. Blade, 31. Airfoil blade, 32. Leading edge, 33. Trailing edge. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0039] like Figure 1-5 The radiator air-cooling impeller shown includes a circular bottom plate 10 , a circular top plate 20 and blades 30 .

[0040] A first opening 11 is provided in the center of the circular bottom plate 10, and a plurality of screw holes for installing the rotating shaft are provided at intervals along the edge of the first opening 11 on the circular bottom plate 10. The screw rod of the rotating shaft is installed in the screw hole, and the screw rod is fixed to the circular bottom plate 10 by a nut, so that the impeller and the rotating shaft are fixed.

[0041] The circular bottom plate 10 and the circular top plate 20 are arranged opposite to each other in the first direction, and a second opening 21 is arranged in the center of the circular top plate 20. The second opening 21 is used for air outlet, wherein the second opening 21 is an opening of a concentric circle of a second radius, and the opening of the concentric circle of the second radius is formed along the circumference of the concentric circle of the third radius on the circular top plate 20 with a trend of gradually reducing the radius, so that the circular top plate 20 gradually bulges toward the first direction until the radius of the concentric circle formed by the bulge is the second radius, and an opening is formed for the concentric circle of the second radius. The air outlet formed by bulging upward with a trend of decreasing radius is used to balance the air outlet size and improve the air outlet intensity.

[0042] Preferably, until the radius of the concentric circle formed by the protrusion is the second radius, the concentric circle of the second radius is used to make the circular top plate 20 continue to protrude in the first direction by a second distance, and an opening is formed for the concentric circle of the second radius at the second distance, and an upward protrusion of an equal radius is raised to guide the air outlet direction.

[0043] The blade 30 includes a plurality of airfoil blades 31, the lower end surface of the airfoil blade 31 is connected to the circular bottom plate 10, and the upper end surface of the airfoil blade 31 is correspondingly connected to the circular top plate 20 through the lower end surface. The end point of the leading edge 32 of the lower end surface of the airfoil blade 31 coincides with the first point 13 on the circular bottom plate 10, and the end point of the trailing edge 33 coincides with the second point 14 on the circular bottom plate 10. The chord (also called chord line) of the lower end surface of the airfoil blade 31 coincides with the first connecting line 17, and the first connecting line 17 is the connecting line between the first point 13 and the second point 14.

[0044] The blade 30 is preferably a blade 30 made of a lightweight carbon fiber composite material. The composite material can be any existing one that can achieve the purpose of the invention, such as a T700 carbon fiber composite material. The carbon fiber composite material has a reduced weight, which reduces the moment of inertia, reduces the starting current and energy loss, improves energy efficiency, and is more low-carbon and environmentally friendly. In addition, carbon fiber has extremely strong corrosion resistance and adaptability to temperature and humidity, which can reduce the corrosion of the blade 30 in harsh environments.

[0045] Among them, the maximum curvature of the middle arc line of the cross section of the airfoil blade 31 is 6.0% of the chord length, the maximum arc height of the middle arc line of the cross section of the airfoil blade 31 is at a position of 30.0% of the chord length, and the maximum thickness of the cross section of the airfoil blade 31 is 6.0% of the chord length. The description of the above features is as follows: The thickness of the airfoil, the curvature of the middle arc line, and the highest point of the airfoil are usually expressed as a percentage of the chord length. The maximum curvature of the middle arc line is expressed by the distance from the highest point of the middle arc line to the chord. The maximum arc height of the middle arc line refers to the distance from the highest point of the middle arc line to the leading edge 32. The maximum thickness of the airfoil refers to the maximum diameter of the inscribed circle between the upper arc line and the lower arc line.

[0046] The blade 30 of the utility model is constructed as a streamlined single-layer airfoil shape with an offset center of gravity, which can work at a higher aerodynamic efficiency, while reducing the generation of turbulence and eddies, and can reduce operating noise. The above-mentioned maximum curvature, maximum arc height, and maximum thickness distribution of the airfoil blade 31 belong to the molding of large curvature variable thickness components, which can provide the blade 30 with good strength and rigidity, and the use of carbon fiber composite materials can still make the blade 30 have a lower weight, so that the blade 30 has good mechanical strength and vibration characteristics, and improves the stability and life of the entire fan.

[0047] The airfoil blade 31 of the utility model is formed into a single-layer center of gravity offset shape, so that the center of gravity is biased toward the leading edge 32, so that when the blade 30 is installed on the impeller, the center of gravity of the airfoil blade 31 is close to the windward surface, thereby increasing the lift coefficient. The maximum lift coefficient of an ordinary impeller is about 1-1.2, and the lift coefficient of the airfoil blade 31 of the impeller of the utility model is 1.8.

[0048] Among them, the lift coefficient of the impeller usually refers to the dimensionless coefficient related to the impeller characteristics and fluid characteristics of the force perpendicular to the impeller plane generated by the impeller on the fluid when it rotates in fluid dynamics. The lift coefficient CL is defined as the ratio of the lift L to the dynamic pressure q and the reference area A, expressed as follows:

[0049]

[0050] Where ρ is the fluid density and v is the fluid velocity.

[0051] The measurement steps are as follows:

[0052] Install the impeller in the experimental setup and make sure it can rotate freely. Set the flow rate of the fluid and make sure the fluid flow is stable. Use a measuring tool to measure the fluid velocity around the impeller. Take multiple points upstream and downstream of the impeller to obtain the average velocity. Use a force sensor to measure the vertical force on the impeller as it rotates. Make sure the measurement system does not interfere with the rotation of the impeller. Collect experimental data, including fluid velocity, impeller speed, lift, etc., and calculate the lift coefficient.

[0053] Different from the one-sided parallel arrangement of the existing metal blades 30, the utility model constructs the circular base plate 10 as a virtual division of seven equal parts with 12 equal-center angles, the dividing line is the first dividing line 15, the intersection of the first dividing line 15 and the concentric circle of the first radius on the circular base plate 10 is the first point 13, the first radius is smaller than the radius of the circular base plate 10, the first dividing line 15 is rotated 45° counterclockwise to form a second dividing line 16, the intersection of the second dividing line 16 and the circumference of the circular base plate 10 is the second point 14, and the angle between the second dividing line 16 and the first connecting line 17 is 41°.

[0054] Since the center of gravity of the airfoil blade 31 of the utility model is offset toward the leading edge 32, which is different from the center of gravity of the existing metal blade 30 being located at the center of the blade 30, the lightweight airfoil blade 31 of the utility model is difficult to achieve a one-sided fully parallel arrangement of the blade 30. In order to balance the center of gravity, on the one hand, the utility model requires that the airfoil blade 31 be arranged at the radial center position of the circular bottom plate 10, but on the other hand, the second dividing line 16 of the previous airfoil blade 31 and the leading edge 32 of the next airfoil blade 31 should have an unobstructed open space spacing, so as to achieve the effect of offsetting the single-layer center of gravity of the airfoil blade 31.

[0055] To this end, the circular base plate 10 of the utility model is designed in a circular shape and is virtually divided into seven equal parts with equal center 12 angles. The virtual division is not an actual division, but a virtual division thereon for determining the first point 13 and the second point 14. Each center 12 angle of the division is approximately 51.43°, which makes the second dividing line 16 and the leading edge 32 of the next counterclockwise adjacent aerofoil blade 31 have an unobstructed open space spacing of approximately 6.43° of the center 12 angle, that is, the first spacing between the second dividing line 16 of the previous aerofoil blade 31 and the leading edge 32 of the next aerofoil blade 31, and the above-mentioned arrangement and installation method of the blades 30 makes the leading edge 32 of the next blade 30 point to the center of gravity position of the previous aerofoil blade 31, which makes the center of gravity of the aerofoil blade 31 basically located in the central position of the circular base plate 10.

[0056] Therefore, the spacing of the single-layer aerofoil blade 31 with a center of gravity offset makes the center of gravity of the blade 30 unobstructed and on the windward side, and the center of gravity of the aerofoil blade 31 is basically located at the central position of the circular bottom plate 10, achieving a balanced center of gravity and simultaneously realizing the use of the single-layer aerofoil blade 31 with a center of gravity offset. On this basis, the above-mentioned blade 30 structure of the utility model and the arrangement of the blade 30 on the impeller make the center of gravity of the blade 30 unobstructed and on the windward side, thereby improving the lift coefficient and optimizing the lift-to-drag ratio. Therefore, when the same lift is generated, the resistance of the impeller of the utility model is smaller, and in the application of the fan, the conversion efficiency can be improved, and the same input power can generate a larger air flow or pressure increase.

[0057] In another embodiment, the radiator air-cooled impeller is installed in an electric locomotive, that is, the fan of the electric locomotive is installed in an oil-water cooling tower, wherein the impeller of the fan is the radiator air-cooled impeller in any of the above examples.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the present utility model, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previously associated objects are in an "or" relationship. "At least one" means one or more; "at least one of A and B" is similar to "A and / or B", describing the association relationship of associated objects, indicating that three relationships may exist. For example, at least one of A and B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0063] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0064] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A radiator air-cooling impeller, characterized in that: include A circular bottom plate, wherein a first opening is arranged at the center of the circular bottom plate; A circular top plate, wherein the circular bottom plate and the circular top plate are arranged opposite to each other in a first direction, and a second opening is arranged at the center of the circular top plate; Blades, the blades comprising a plurality of airfoil blades, the lower end surfaces of the airfoil blades being connected to the circular bottom plate, and the upper end surfaces of the airfoil blades being correspondingly connected to the circular top plate; Among them, the leading edge of the lower end surface of the airfoil blade is arranged on the circular bottom plate, and the trailing edge of the lower end surface of the airfoil blade is arranged on the circumference line of the circular bottom plate. The line connecting the center of the circular bottom plate and the leading edge of the airfoil blade is the first dividing line, and the line connecting the center of the circular bottom plate and the trailing edge of the airfoil blade is the second dividing line. There is a first distance between the leading edge of the rear airfoil blade and the second dividing line of the front airfoil blade, and points to the center of gravity position of the front airfoil blade.

2. The radiator air-cooling impeller according to claim 1, characterized in that: in, The leading edge endpoint of the lower end surface of the airfoil blade coincides with the first point on the circular bottom plate, the trailing edge endpoint coincides with the second point on the circular bottom plate, and the chord of the lower end surface of the airfoil blade coincides with the first connecting line, which is the connecting line between the first point and the second point.

3. The radiator air-cooling impeller according to claim 2, characterized in that: The circular base plate is constructed to be virtually divided into seven equal parts with equal central angles, the dividing line is the first dividing line, the intersection of the first dividing line and the concentric circle of the first radius on the circular base plate is the first position point, the first radius is smaller than the radius of the circular base plate, the first dividing line is rotated 45° counterclockwise to form a second dividing line, the intersection of the second dividing line and the circumference line of the circular base plate is the second position point, and the angle between the second dividing line and the first connecting line is 41°.

4. The radiator air-cooling impeller according to claim 3, characterized in that: The first point is arranged at a radially central position of the circular bottom plate.

5. The radiator air-cooling impeller according to claim 1, characterized in that: in, A plurality of screw holes for installing the rotating shaft are arranged at intervals on the circular bottom plate along the edge of the first opening, the screw rods of the rotating shaft are installed in the screw holes, and the screw rods are fixed to the circular bottom plate by nuts.

6. The radiator air-cooling impeller according to claim 1, characterized in that: in, The maximum curvature of the mid-arc line of the cross-section of the airfoil blade is 6.0% of the chord length, the maximum arc height of the mid-arc line of the cross-section of the airfoil blade is at a position of 30.0% of the chord length, and the maximum thickness of the cross-section of the airfoil blade is 6.0% of the chord length.

7. The radiator air-cooling impeller according to claim 1, characterized in that: in, The second opening is an opening of a concentric circle of a second radius, and the opening of the concentric circle of the second radius is formed along the circumference of a concentric circle of a third radius on the circular top plate with a trend of gradually reducing the radius, so that the circular top plate gradually bulges toward the first direction until the radius of the concentric circle formed by the bulge is the second radius, forming an opening for the concentric circle of the second radius.

8. The radiator air-cooling impeller according to claim 7, characterized in that: in, The radius of the concentric circle formed by the protrusion is the second radius. The concentric circle of the second radius is used to make the circular top plate continue to protrude in the first direction by a second distance at the second radius, forming an opening for the concentric circle of the second radius at the first distance.

9. The radiator air-cooling impeller according to claim 1, characterized in that: The blade is a carbon fiber composite material blade.

10. An electric locomotive, characterized in that: The electric locomotive is equipped with the radiator air-cooled impeller described in any one of claims 1-9.

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