A wind tunnel experimental device for measuring the force of an ice-covered transmission line and its usage method

Abstract

The present invention relates to a wind tunnel experimental device for measuring the force of an ice-covered transmission wire and its usage method, which includes a wind tunnel, an upper end plate, a lower end plate, a multi-split wire segment, and a translation mechanism. The two ends of the multi-split wire segment are respectively connected to the upper end plate and the lower end plate by spherical hinges. The translation mechanism includes an automatic telescopic mechanism and a guide rod. There is an annular guide rail at the top of the wind tunnel, and the guide rod is slidably connected to the guide rail. The lower end of the guide rod is connected to the upper end plate. One end of the automatic telescopic mechanism is connected to the upper end of the guide rod and is used to push the guide rod to slide along the guide rail, and then drive the upper end plate to translate relative to the lower end plate so as to adjust the inclination angle of the multi-split wire segment with respect to the horizontal plane. In this application, the wire is tilted by the automatic telescopic mechanism, and the resistance, lift, and torque of the wire model are measured by a balance. It can realize the detection of the aerodynamic characteristic parameters of the wire under oblique winds at various angles, and can simulate the real-time changing wind direction in the natural environment, which is beneficial to studying the influence of wind direction changes on the aerodynamic parameters of the wire.

Description

Technical Field

[0001] The present invention relates to the technical field of aerodynamic analysis of transmission lines, and particularly to a wind tunnel experimental device for measuring the force of ice-covered transmission conductors and a using method thereof. Background Art

[0002] The aerodynamic characteristics of ice-covered conductors are key parameters for studying the galloping of ice-covered conductors. To ensure the safe operation of transmission lines and avoid accidents, it is very necessary to study the aerodynamic characteristics of ice-covered conductors. Wind tunnel tests are very important and commonly used research methods at present.

[0003] In the wind tunnel test research on the aerodynamic characteristics of ice-covered conductors, the research on the aerodynamic characteristics of conductors under the action of oblique wind is necessary and very important. The traditional method for the aerodynamic characteristics of conductors is to rigidly connect the conductors in the center of the wind tunnel, and the installation position of the conductors is fixed, which makes it difficult to measure the aerodynamic characteristics of the conductors under the action of changing oblique wind. Summary of the Invention

[0004] This application provides a wind tunnel experimental device for measuring the force of ice-covered transmission conductors and a using method thereof to solve the above technical problems.

[0005] This application is achieved through the following technical solutions:

[0006] A wind tunnel experimental device for measuring the force of ice-covered transmission conductors includes:

[0007] A wind tunnel;

[0008] An upper end plate, installed in the wind tunnel and located above the lower end plate;

[0009] A lower end plate, rotatably installed in the wind tunnel and capable of rotating relative to the wind tunnel around a first rotation center, and the first rotation center is perpendicular to the axis of the wind tunnel;

[0010] A multi-split conductor segment, with its upper and lower ends respectively movably connected to the upper end plate and the lower end plate, and an ice-covered model is connected or not connected to the multi-split conductor segment;

[0011] A translation mechanism, connected to the upper end plate for driving the upper end plate to translate relative to the lower end plate so as to adjust the inclination angle of the multi-split conductor segment with respect to the horizontal plane;

[0012] The lower end plate is connected or not connected to a motor for driving its rotation.

[0013] Optionally, a wind tunnel experimental device for measuring the force of ice-covered transmission conductors further includes a rotating base, which is rotatably connected to the wind tunnel and capable of rotating relative to the wind tunnel around the first rotation center; the central axis of the rotating base coincides with the first rotation center, and the rotating base is fixedly connected to the center position of the lower end plate.

[0014] Specifically, the upper and lower ends of the multi-split conductor segment are respectively rotatably connected to the upper end plate and the lower end plate through spherical hinge structures.

[0015] Optionally, spherical rods are installed at both ends of the multi-split conductor segment. The spherical rod has a rod part and a sphere connected to one end of the rod part. The rod part of the spherical rod extends into the multi-split conductor segment, and its sphere is located outside the multi-split conductor segment;

[0016] Through holes adapted to the spheres of the spherical rods are machined at corresponding positions on the upper end plate and the lower end plate. The hole walls of the through holes are spherical surfaces; the spheres of the spherical rods are installed in the through holes and pressed on the upper end plate and the lower end plate by two sphere fixing blocks. The sphere fixing blocks are threadedly connected to the upper end plate and the lower end plate;

[0017] The sphere fixing block has a spherical surface adapted to the sphere. The spherical surface of the sphere fixing block and the spherical surface of the upper end plate or the lower end plate together form a cavity with a spherical surface, and a part of the sphere is installed in the cavity.

[0018] Specifically, the spherical rod is threadedly connected to the multi-split conductor segment.

[0019] Optionally, the balance is embedded inside the multi-split conductor segment.

[0020] Optionally, the translation mechanism includes an automatic telescopic mechanism and a guide rod. There is an annular guide rail at the top of the wind tunnel, and the guide rod is slidably connected to the guide rail;

[0021] One end of the automatic telescopic machine is connected to the upper end of the guide rod for pushing the guide rod to slide along the guide rail, and the lower end of the guide rod is connected to the upper end plate.

[0022] Specifically, a runway-shaped annular groove is formed on the upper wall of the wind tunnel to form the guide rail. Sealing sliders are arranged one by one in the guide rail. The sealing sliders are embedded in the guide rail and can move along the guide rail under the action of an external force; there is a guide rod hole on one of the sealing sliders for the guide rod to pass through. The lower end of the guide rod passes through the guide rod hole and is connected to the upper end plate inside the wind tunnel. The guide rod is in sliding fit with the guide rod hole;

[0023] The guide rod is not telescopic but can move up and down relative to the wind tunnel as a whole, or the guide rod can be telescopic up and down.

[0024] Optionally, the automatic telescopic mechanism is relatively fixed to the wind tunnel. The guide rod includes an inner rod and an outer cylinder. One end of the inner rod is movably inserted into the outer cylinder, and the two can move axially relative to each other and can also rotate circumferentially relative to each other; the upper end of the inner rod is connected to the automatic telescopic machine, the outer cylinder is installed in the guide rod hole of the sealing slider, and the lower end of the outer cylinder is fixedly connected to the upper end plate.

[0025] A method for using a wind tunnel experiment device for measuring the force of an ice-covered transmission line conductor includes the following steps:

[0026] The upper end plate is pushed to translate through a translation mechanism, and then the windward angle of the multi-split conductor segment is adjusted;

[0027] The fan of the wind tunnel starts to work. The multi-split conductor segment undergoes micro-deformation under the action of wind force, and finally the aerodynamic parameters of the conductor model are measured and transmitted by a balance.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] In the present application, the conductor is pushed to incline through an automatic telescopic mechanism, and the resistance, lift, and torque force of the conductor model are measured by a balance. It can realize the detection of the aerodynamic characteristic parameters of the conductor under oblique winds at various angles, and can simulate the real-time changing wind direction in the natural environment, which is beneficial to studying the influence of wind direction changes on the aerodynamic parameters of the conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the embodiments of the present application, form a part of the present application, and do not constitute a limitation on the embodiments of the present invention.

[0031] Figure 1 is a schematic structural diagram of the wind tunnel experimental device in the embodiment;

[0032] Figure 2 is a top view of the guide rail and the sealing slider in the embodiment;

[0033] Figure 3 is a front view of the guide rod and the upper end plate in the embodiment;

[0034] Figure 4 is a cross-sectional view of the guide rod and the upper end plate in the embodiment;

[0035] Figure 5 is a cross-sectional view of the multi-split conductor segment and the spherical rod member in the embodiment;

[0036] Figure 6 is a front view of the multi-split conductor segment and the lower end plate in the embodiment;

[0037] Figure 7 is a three-dimensional view of the connection between the multi-split conductor segment and the lower end plate in the embodiment;

[0038] Figure 8 is a top view of multiple groups of spherical fixing blocks mounted on the lower end plate in the embodiment;

[0039] Figure 9 is a top view of a certain group of spherical fixing blocks mounted on the lower end plate in the embodiment;

[0040] Figure 10 is a cross-sectional view of multiple groups of spherical fixing blocks mounted on the lower end plate in the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, technical solutions and advantages of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0043] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0044] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this invention is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] As shown Figure 1 in the figure, the wind tunnel experimental device for measuring the force of an ice-covered transmission line disclosed in this embodiment includes a wind tunnel 1, a hydraulic rod 2, a balance 3, a rotating base 4, an upper end plate 6, a multi-split conductor segment 8, a lower end plate 9, a guide rod 10, a guide rail 11, a sealing slider 12, a spherical rod member 14, and a spherical fixing block 15.

[0048] There is an annular guide rail 11 at the top of the wind tunnel 1. The guide rod 10 is slidably connected to the guide rail 11. One end of the hydraulic rod 2 is connected to the upper end of the guide rod 10 for pushing the guide rod to slide along the guide rail 11, and the lower end of the guide rod 10 is connected to the upper end plate 6.

[0049] The lower end plate 9 is located above the rotating base 4 and fixedly connected to the rotating base 4. The rotating base 4 is rotatably connected to the wind tunnel 1. The rotating base 4 can rotate relative to the wind tunnel 1 around a first rotation center, and the first rotation center is perpendicular to the axis of the wind tunnel 1. The lower end plate 9 and the rotating base 4 are integrally manufactured or not integrally manufactured.

[0050] The upper and lower ends of the multi-split conductor segment 8 are respectively rotatably connected to the upper end plate 6 and the lower end plate 9 through a spherical hinge structure, and the balance 3 is embedded inside the multi-split conductor segment 8.

[0051] In a possible design, the rotating base 4 is connected to a motor (not shown in the figure) for driving its rotation. The motor is located outside the wind tunnel 1. The rotation of the motor can drive the lower end plate 9 to rotate, and then adjust the initial windward attack angle of the conductor 8.

[0052] In a possible design, the balance 3 is a DXTP balance.

[0053] In a possible design, as Figure 2 shown in the figure, a runway-shaped annular groove is formed on the upper wall of the wind tunnel 1 to form the guide rail 11. The guide rail 11 is filled with sealing sliders 12 one by one. The sealing sliders 12 are embedded in the guide rail 11 and can move along the guide rail 11 under the action of an external force. There is a guide rod hole on one of the sealing sliders 12 for the guide rod 10 to pass through. The lower end of the guide rod 10 passes through the guide rod hole and is connected to the upper end plate 6 inside the wind tunnel 1. The guide rod 10 is slidably matched with the guide rod hole. Filling the sealing sliders 12 one by one can properly seal the runway-shaped annular groove and reduce wind leakage.

[0054] Since the upper end plate 6 will have a displacement in the vertical direction during the process of adjusting the inclination of the multi-split conductor segment 8, this can be achieved by moving the guide rod 10 up and down, or by the telescopic movement of the guide rod 10. If the guide rod 10 cannot be telescoped, the whole can move up and down relative to the wind tunnel 1. Taking the guide rod 10 that can be telescoped up and down as an example, as Figure 3 、 Figure 4As shown in the figure, the automatic telescoping mechanism is fixedly relative to the wind tunnel 1. The guide rod 10 includes an inner rod 102 and an outer cylinder 101. One end of the inner rod 102 is movably inserted into the outer cylinder 101, and the two can move axially relative to each other and can also rotate circumferentially relative to each other. The upper end of the inner rod 102 is connected to the hydraulic rod 2. The outer cylinder 101 is installed in the guide rod hole of the sealing slider 12, and the lower end of the outer cylinder 101 is fixedly connected to the upper end plate 6.

[0055] In a possible design, the guide rod 10 is fixedly connected to the upper end plate 6 by bolts. Specifically, there is a central hole in the center of the upper end plate 6. After the lower end of the guide rod 10 passes through the central hole, it is flange-connected to the upper end plate 6.

[0056] In a possible design, as Figure 5 shown, spherical rods 14 are installed at both ends of the multi-split wire segment 8. The spherical rod 14 has a rod portion and a sphere connected to one end of the rod portion. The rod portion of the spherical rod 14 extends into the multi-split wire segment 8, and its sphere is located outside the multi-split wire segment 8.

[0057] In a possible design, spherical shells adapted to the spheres of the spherical rods 14 are installed on the upper end plate 6 and the lower end plate 9. The spheres are installed in the spherical shells to form a spherical hinge structure.

[0058] In a possible design, as Figures 4 - 10 shown, through holes 16 adapted to the spheres of the spherical rods 14 are machined at corresponding positions on the upper end plate 6 and the lower end plate 9. The hole walls of the through holes 16 are spherical surfaces; the spheres of the spherical rods 14 are installed in the through holes 16 and are pressed on the upper end plate 6 and the lower end plate 9 by two sphere fixing blocks 15. The sphere fixing blocks 15 are fixedly connected to the upper end plate 6 and the lower end plate 9 by bolts. The sphere fixing blocks 15 have spherical surfaces adapted to the spheres. The spherical surfaces of the sphere fixing blocks 15 and the spherical surfaces of the upper end plate 6 or the lower end plate 9 together form a cavity with a spherical surface. A part of the sphere is installed in this cavity, which can not only maintain rotation but also realize the connection between the sphere and the upper end plate 6 and the lower end plate 9.

[0059] In a possible design, as Figure 5 shown, the spherical rod 14 is bolted to the multi-split wire segment 8.

[0060] In a possible design, an ice accretion model is rigidly connected to the multi-split wire segment 8.

[0061] In a possible design, the multi-split wire segment 8 is a four-split wire.

[0062] Based on the above wind tunnel experimental device, this embodiment discloses a method for measuring the force of a transmission wire in a wind tunnel experiment, including the following steps:

[0063] First, the hydraulic rod 2 is used to push the guide rod 10 to adjust the windward angle of the multi-split wire segment 8;

[0064] When the fan of the wind tunnel 1 starts to operate, after the multi-split conductor segment 8 is affected by the oblique wind, the multi-split conductor segment 8 starts to drive the upper end plate 6 and the lower end plate 9 to rotate around the first rotation center;

[0065] Finally, the pneumatic parameters of the conductor model are measured and transmitted by the balance 3.

[0066] In a possible design, the wind tunnel 1 is a 1.4-meter × 1.4-meter low-speed wind tunnel.

[0067] In a possible design, the hydraulic rod 2 can be replaced with an automatic telescopic mechanism such as an electric telescopic rod or a cylinder.

[0068] In this embodiment, during the wind tunnel experiment, the inclination angle between the multi-split conductor segment 8 and the ground can be adjusted by controlling the hydraulic rod 2 to change the windward angle, and the change of the pneumatic parameters can be studied by using the real-time data transmitted by the balance 3.

[0069] This embodiment discloses a method for using a wind tunnel experiment device for measuring the force of an ice-covered transmission conductor, including the following steps:

[0070] Push the upper end plate 6 to translate by extending and retracting the hydraulic rod 2, and then adjust the windward angle of the multi-split conductor segment 8;

[0071] When the fan of the wind tunnel 1 starts to operate, the multi-split conductor segment 8 undergoes a slight deformation under the action of the wind force. Different deformations of the conductor in different directions can be obtained through the balance 3 after being subjected to the wind load, and finally the pneumatic parameters of the conductor model are transmitted by the balance 3.

[0072] Optionally, before the fan starts to operate, the initial windward attack angle of the multi-split conductor segment 8 is adjusted by rotating an external motor connected to the lower end plate 9.

[0073] In this embodiment, the inclination angle between the multi-split conductor segment 8 and the ground is adjusted by controlling the length of the hydraulic rod 2 to change the windward angle, and the change of the pneumatic parameters is studied by using the real-time data transmitted by the balance 3. On the basis of changing the oblique wind inclination angle, this embodiment can keep the upper and lower end plates parallel to the horizontal direction, which is beneficial to maintaining the normal air flow of the original wind tunnel test and will not cause interference.

[0074] In a possible design, the hydraulic rod 2 can be replaced with an automatic telescopic mechanism such as an electric telescopic rod or a cylinder.

[0075] In this embodiment, based on the traditional wind tunnel, a device design method of using an angle adjustment device to change the direction of the oblique wind acting on the wire is adopted. By controlling the hydraulic rod to push the wire to tilt, the resistance, lift, and torque of the wire model are measured using a balance. This application can detect the aerodynamic characteristic parameters of the wire under oblique winds at various angles and can simulate the real-time changing wind direction in the natural environment, which is beneficial for studying the influence of wind direction changes on the aerodynamic parameters of the wire.

[0076] The above specific implementation manners further elaborate on the purpose, technical solution, and beneficial effects of this application. It should be understood that the above are only specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An icing transmission line force measurement wind tunnel experimental device, characterized in that: Comprising: A wind tunnel (1); An upper end plate (6), installed inside the wind tunnel (1) and located above the lower end plate (9); A lower end plate (9), rotatably installed inside the wind tunnel (1) and capable of rotating relative to the wind tunnel (1) about a first rotation center, the first rotation center being perpendicular to the axis of the wind tunnel (1); A multi-split conductor segment (8), with its upper and lower ends respectively movably connected to the upper end plate (6) and the lower end plate (9), and an ice accretion model may or may not be connected to the multi-split conductor segment (8), and a balance (3) is embedded inside the multi-split conductor segment (8); A translation mechanism, connected to the upper end plate (6) for driving the upper end plate (6) to translate relative to the lower end plate (9) so as to adjust the inclination angle of the multi-split conductor segment (8) with respect to the horizontal plane; The lower end plate (9) is connected or not connected to a motor for driving its rotation; The translation mechanism includes an automatic telescopic mechanism and a guide rod (10), there is an annular guide rail (11) at the top of the wind tunnel (1), and the guide rod (10) is slidably connected to the guide rail (11); One end of the automatic telescopic machine is connected to the upper end of the guide rod (10) for pushing the guide rod to slide along the guide rail (11), and the lower end of the guide rod (10) is connected to the upper end plate (6); A runway-shaped annular groove is formed on the upper wall of the wind tunnel (1) to form the guide rail (11), and the guide rail (11) is densely filled with sealing sliders (12) one by one. The sealing sliders (12) are embedded in the guide rail (11) and can move along the guide rail (11) under an external force; there is a guide rod hole on one of the sealing sliders (12) for the guide rod (10) to pass through. The lower end of the guide rod (10) passes through the guide rod hole and is connected to the upper end plate (6) inside the wind tunnel (1), and the guide rod (10) is in sliding fit with the guide rod hole.

2. The wind tunnel experimental device for measuring the force of an ice-covered transmission wire according to claim 1, characterized in that: It further includes a rotating base (4), the rotating base (4) is rotatably connected to the wind tunnel (1) and can rotate relative to the wind tunnel (1) about the first rotation center; the central axis of the rotating base (4) coincides with the first rotation center, and the rotating base (4) is fixedly connected to the central position of the lower end plate (9).

3. The wind tunnel experimental device for measuring the force of an ice-covered transmission line according to claim 1 or 2, characterized in that: The upper and lower ends of the multi-split conductor segment (8) are respectively rotatably connected to the upper end plate (6) and the lower end plate (9) through ball joint structures.

4. The wind tunnel experimental device for measuring the force of an ice-covered transmission wire according to claim 3, characterized in that: Spherical rods (14) are installed at both ends of the multi-split conductor segment (8). The spherical rods (14) have a rod portion and a sphere connected to one end of the rod portion. The rod portion of the spherical rod (14) extends into the multi-split conductor segment (8), and its sphere is located outside the multi-split conductor segment (8); Through holes (16) adapted to the spheres of the spherical rods (14) are machined at corresponding positions on the upper end plate (6) and the lower end plate (9), and the hole walls of the through holes (16) are spherical surfaces; the spheres of the spherical rods (14) are installed in the through holes (16) and are pressed on the upper end plate (6) and the lower end plate (9) by two sphere fixing blocks (15), and the sphere fixing blocks (15) are threadedly connected to the upper end plate (6) and the lower end plate (9); The sphere fixing blocks (15) have spherical surfaces adapted to the spheres. The spherical surfaces of the sphere fixing blocks (15) and the spherical surfaces of the upper end plate (6) or the lower end plate (9) together form a cavity with a spherical surface, and a part of the sphere is installed in the cavity.

5. The wind tunnel experimental device for measuring the force of an ice-covered transmission line according to claim 4, wherein: The spherical rod (14) is threadedly connected to the multi-split conductor segment (8).

6. The wind tunnel experimental device for measuring the force of an ice-covered transmission line according to claim 1, 2, 4 or 5, characterized in that: The guide rod (10) is non-retractable but can move up and down as a whole relative to the wind tunnel (1), or the guide rod (10) can be telescoped up and down.

7. An icing transmission line force measurement wind tunnel experiment device according to claim 1, 2, 4 or 5, characterized in that: The automatic telescoping mechanism is relatively fixed to the wind tunnel (1). The guide rod (10) includes an inner rod (102) and an outer cylinder (101). One end of the inner rod (102) is movably inserted into the outer cylinder (101), and they can move axially relative to each other and also rotate circumferentially relative to each other. The upper end of the inner rod (102) is connected to the automatic telescoping machine. The outer cylinder (101) is installed in the guide rod hole of the sealing slider (12), and the lower end of the outer cylinder (101) is fixedly connected to the upper end plate (6).

8. The usage method of a wind tunnel experimental device for measuring the force of an ice-covered transmission line according to any one of claims 1-7, characterized in that: It includes the following steps: Push the upper end plate (6) to translate through the translation mechanism, and then adjust the windward angle of the multi-split conductor segment (8); The fan of the wind tunnel (1) starts to work, the multi-split conductor segment (8) undergoes micro-deformation under the action of wind force, and finally the aerodynamic parameters of the conductor model are measured and transmitted by the balance (3).

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