A circular variable cross-section cylinder vortex suppression device

Abstract

The application discloses a kind of circular variable cross-section cylinder vortex vibration suppression device, comprising: spiral winding on the circular variable cross-section cylinder vortex line, the middle part of circular variable cross-section cylinder is equipped with support ring, two bearings are slidably installed in support ring inner wall, the sidewall of two bearings is respectively equipped with the vortex line connected with the top and bottom of circular variable cross-section cylinder, connecting spring is connected between two bearings, support ring outer peripheral wall is rotatably installed with sleeve ring, fan blade is installed on sleeve ring, arc-shaped through slot is arranged in support ring, connecting block is installed on sleeve ring and slidably limited in arc-shaped through slot, elastic member is connected between connecting block and arc-shaped through slot inner wall, support ring is rotatably installed with gear ring fixedly connected with connecting block, arc-shaped through slot is rotatably installed with gear engaged with gear ring, cam is coaxially connected with gear, and cam is installed between two bearings.The application can adjust the ability of inhibiting vortex-induced vibration of circular variable cross-section cylinder by wind power.

Description

Technical Field

[0001] This invention belongs to the field of circular cross-section vortex vibration suppression technology, specifically relating to a circular variable cross-section column vortex vibration suppression device. Background Technology

[0002] Currently, most steel pipe lightning rods used in substations are single-cantilever circular steel pipe components. As the height of the steel pipe lightning rod increases, its slenderness ratio continuously increases, leading to a continuous decrease in the ignition wind speed of the first and second order crosswind vortex-induced vibrations of the lightning rod, resulting in high-frequency, large-amplitude vortex-induced vibrations.

[0003] Existing technologies, such as CN 203515366 U, disclose a vortex-induced vibration suppression device using perforated guide spiral plates. This device involves cascading perforated guide spiral plates onto a sleeve outside a riser, effectively suppressing vortex-induced vibrations caused by flow from different directions. However, because wind force varies, the fixed-pitch spiral plates are not ideal for suppressing varying wind forces.

[0004] Therefore, it is necessary to propose a vortex-induced vibration suppression device for circular variable cross-section columns to solve the above problems. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a circular variable cross-section column vortex vibration suppression device to solve the problem that the suppression effect of the spiral plate on vortex-induced vibration is not ideal in the prior art under changing wind force.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a vortex-induced vibration suppression device for a circular variable cross-section column, comprising: multiple helicaled vortex lines wound around a circular variable cross-section column; a support ring installed at the center of the circular variable cross-section column; two bearings slidably mounted on the inner wall of the support ring; vortex lines connected to the top and bottom of the circular variable cross-section column are respectively installed on the sidewalls of the two bearings that are far apart; a compression spring connects the two bearings; a collar rotatably mounted on the outer peripheral wall of the support ring; a fan blade circumferentially mounted on the collar with the collar axis as the center; an arc-shaped through groove provided inside the support ring; and an extension extending to the arc shape mounted on the collar. A connecting block is installed in the slot, which slides within the arc-shaped slot. Elastic elements are connected between the opposite side walls of the connecting block and the inner wall of the arc-shaped slot. A gear ring is rotatably installed inside the support ring, and the gear ring is fixedly connected to the connecting block. Rotating the collar allows the gear ring to rotate. A gear that meshes with the gear ring is rotatably installed inside the arc-shaped slot. The gear is coaxially connected to a cam located inside the support ring. Rotation of the gear ring causes the cam to rotate via the gear. The cam is installed between two bearings, and rotation of the cam allows the two bearings to move closer or further apart.

[0008] Furthermore, a conical spring is provided inside the spoiler line, and the spoiler line is arranged around the conical spring.

[0009] Furthermore, the inner ring of the bearing is provided with multiple grooves circumferentially around the bearing axis. A slider is connected to the groove by a spring. The slider is slidably connected to the groove and is connected to the deflection line in a one-to-one correspondence.

[0010] Furthermore, annular sliding plates that are detachably connected to the outer ring of the bearings are installed on the sidewalls of the two bearings that are close to each other. The annular sliding plates are slidably connected to the inner wall of the support ring. The compression spring is installed between the two annular sliding plates, and the cam abuts against the annular sliding plates.

[0011] Furthermore, the support ring has multiple arc-shaped through grooves circumferentially arranged with the support ring axis as the center.

[0012] Furthermore, the diameter of the spherical concave hole is 2mm to 5mm.

[0013] Furthermore, the top and bottom of the circular variable cross-section column are fitted with hoops for fixing the spoiler lines to the circular variable cross-section column.

[0014] Furthermore, the spoiler line is provided with a plurality of spherical recesses along its extension direction.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. This invention, verified by wind tunnel tests, can be used on circular variable cross-section columns. Multiple turbulence lines with multiple spherical concave holes are spirally wound around the circular variable cross-section column, which can break up the vortices generated by the incoming airflow, thereby suppressing the vortex-induced vibration of the circular variable cross-section column. Moreover, the control device is easy to install, requires no maintenance, improves the service life of the structure, and reduces the operating cost of the structure.

[0017] 2. This invention can adjust the ability to suppress vortex-induced vibration of a circular variable cross-section column by means of wind force. By moving the two bearings closer or further apart to adapt to changing wind force, the ability to suppress vortex-induced vibration of the circular variable cross-section column can be further improved. Since the wind force is not constant and varies in strength, the two bearings will slide back and forth, thereby keeping the turbulence lines on both sides in motion, further breaking up the vortices generated by the incoming wind, thus suppressing the vortex-induced vibration of the circular variable cross-section column.

[0018] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0019] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0020] Figure 1 This is a schematic diagram of the installation of the streamline in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the installation of the streamline in an embodiment of the present invention;

[0022] Figure 3 Embodiments of the present invention Figure 2 A magnified view of part A in the middle;

[0023] Figure 4 This is a schematic diagram of the bearing installation according to an embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional view of the support ring according to an embodiment of the present invention;

[0025] Figure 6 Embodiments of the present invention Figure 5 A magnified view of part B in the middle;

[0026] Figure 7 This is a top view of the bearing installation according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the slider installation according to an embodiment of the present invention.

[0028] The following are labeled in the attached diagram: 1. Circular variable cross-section column; 2. Spoiler line; 201. Spherical concave hole; 3. Hoop; 4. Conical spring; 5. Support ring; 501. Collar; 502. Fan blade; 503. Arc-shaped through groove; 504. Connecting block; 505. Elastic element; 506. Toothed ring; 507. Gear; 508. Cam; 509. Bearing; 510. Compression spring; 511. Groove; 512. Spring; 513. Slider; 514. Annular sliding plate. Detailed Implementation

[0029] like Figures 1-8 As shown, the present invention provides a vortex vibration suppression device for a circular variable cross-section column. The vortex vibration control device is installed on the outer wall of the circular variable cross-section column 1. The vortex vibration control device includes: a plurality of turbulence lines 2 spirally wound on the circular variable cross-section column 1. The turbulence lines 2 are provided with a plurality of spherical concave holes 201 along the extending direction. The diameter of the spherical concave holes 201 is 2mm to 5mm.

[0030] In this plan, such as Figure 1The diameter of the cross-section of the circular variable cross-section column 1 gradually decreases from the lower right to the upper right. According to wind tunnel tests, it can be used on the circular variable cross-section column 1. Multiple turbulence lines 2 with multiple spherical concave holes 201 are spirally wound on the circular variable cross-section column 1, which can break the vortex generated by the incoming airflow, thereby suppressing the vortex-induced vibration of the circular variable cross-section column 1. Moreover, the control device is easy to install, requires no maintenance, improves the service life of the structure, and reduces the operating cost of the structure.

[0031] In one embodiment of the present invention, the top and bottom of the circular variable cross-section column 1 are fitted with hoops 3 for fixing the spoiler line 2 to the circular variable cross-section column 1.

[0032] In this plan, such as Figure 1 The spoiler line 2 is fixed to the circular variable cross-section column 1 by the sleeve 3, which ensures the stability of the spoiler line 2.

[0033] In one embodiment of the present invention, a conical spring 4 is provided inside the deflector 2, and the deflector 2 is arranged to surround the conical spring 4.

[0034] In this plan, such as Figure 3 A conical spring 4 with the same spiral shape as the spoiler 2 is set inside the spoiler 2, so that under the elastic action of the conical spring 4, the spoiler 2 is in close contact with the outer wall of the circular variable cross-section column 1.

[0035] In one embodiment of this invention, a support ring 5 is installed in the middle of the circular variable cross-section column 1. A collar 501 is rotatably installed on the outer peripheral wall of the support ring. A fan blade 502 is circumferentially installed on the collar 501 with the axis of the collar 501 as the center. An arc-shaped through groove 503 is provided inside the support ring 5. A connecting block 504 extending into the arc-shaped through groove 503 is installed on the collar 501. The connecting block 504 slides within the arc-shaped through groove 503. Elastic elements 505 are connected between the opposite side walls of the connecting block 504 and the inner wall of the arc-shaped through groove 503. A toothed ring 506 is rotatably installed inside the support ring 5. The toothed ring 506 is fixedly connected to the connecting block 504. Rotating the collar 501 can cause the toothed ring 506 to rotate. A gear 507 is rotatably installed inside the arc-shaped through groove 503. The gear 507 meshes with the gear ring 506. A cam 508 is coaxially arranged on the gear 507. The cam 508 is located inside the support ring 5. The rotation of the gear ring 506 can cause the cam 508 to rotate through the gear 507. Two bearings 509 are slidably installed inside the support ring 5. The cam 508 is installed between the two bearings 509. A compression spring 510 is connected between the two bearings 509. The rotation of the cam 508 can cause the two bearings 509 to move closer or further apart. Multiple grooves 511 are provided circumferentially around the axis of the bearing 509 on the inner ring of the bearing 509. A slider 513 is connected to the groove 511 by a spring 512. The slider 513 is slidably connected to the groove 511 and is connected to the deflection line 2 one by one.

[0036] In this plan, such as Figure 4 When the wind passes through the collar 501, due to the action of the fan blades 502, the wind drives the collar 501 to rotate, such as Figure 6Because the connecting block 504 on the collar 501 is located within the arc-shaped through groove 503, and the connecting block 504 has elastic elements 505 at both ends that connect to the inner wall of the arc-shaped through groove 503, the rotation range of the collar 501 is limited to the range of the arc-shaped through groove 503. Furthermore, due to the action of the elastic element 505, when the wind drives the collar 501 to rotate, it creates resistance against the elastic element 505, so that the collar 501 can only rotate when the wind force is greater than the elastic force of the elastic element 505. When the connecting block 504 slides along the arc-shaped through groove 503, it drives the gear ring 506 to rotate, thereby rotating the gear 507, which in turn rotates the cam 508, causing the two bearings 509 to move closer or further apart. When the two bearings 509 move further apart, the turbulence line 2 between the bearing 509 near the top of the circular variable cross-section column 1 and the top of the circular variable cross-section column 1, as well as the turbulence line 2 between the bearing 509 near the bottom of the circular variable cross-section column 1 and the bottom of the circular variable cross-section column 1, are compressed, thus reducing the pitch of the turbulence line 2. The wind force is reduced, thereby increasing the contact area between the spoiler line 2 and the airflow, further improving the ability to suppress vortex-induced vibration of the circular variable cross-section column 1. When the wind force decreases, due to the action of the elastic element 505, the connecting block 504 returns to its original position, thereby causing the cam 508 to return to its original position, and thus causing the two bearings 509 to return to their original positions, so as to reduce the contact area between the spoiler line 2 and the airflow, ensuring the use of the circular variable cross-section column 1. Moreover, since the wind force is not constant, when the wind force is strong and weak, the two bearings 509 will slide back and forth, so that the spoiler line 2 on both sides is in a moving state, further breaking up the vortex generated by the incoming airflow, thereby suppressing the vortex-induced vibration of the circular variable cross-section column 1. Therefore, this solution can adjust the ability to suppress the vortex-induced vibration of the circular variable cross-section column 1 by wind force. And during the process of the bearing 509 sliding along the inner wall of the support ring 5, since the spoiler line 2 is equipped with a conical spring 4, during the stretching and compression of the conical spring 4, the inner ring of the bearing 509 rotates to adapt to the deformation of the conical spring 4. Figure 7 Furthermore, the flow line 2 is connected to the slider 513 so that during the sliding process of the bearing 509, the slider 513 is always kept in contact with the outer wall of the circular variable cross-section column 1 under the action of the spring 512, thereby keeping the flow line 2 in contact with the outer wall of the circular variable cross-section column 1.

[0037] In one embodiment of the present invention, an annular sliding plate 514 is installed on the sidewalls of the two bearings 509 that are close to each other and is detachably connected to the outer ring of the bearings 509. The annular sliding plate 514 is slidably connected to the inner wall of the support ring 5. The compression spring 510 is installed between the two annular sliding plates 514 and the cam 508 abuts against the annular sliding plate 514.

[0038] In this plan, such as Figure 4 The installation of the compression spring 510 is facilitated by setting the annular sliding plate 514.

[0039] In one embodiment of the present invention, the support ring 5 is provided with a plurality of arc-shaped through grooves 503 circumferentially around the axis of the support ring 5.

[0040] In this plan, such as Figure 5 By setting multiple arc-shaped through slots 503, that is, cams 508 are installed in the support ring 5 at positions corresponding to each arc-shaped through slot 503. By setting multiple cams 508, the support capacity of the cams 508 for the two bearings 509 is ensured, so that the two bearings 509 can slide stably.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A device for suppressing vortex-induced vibration of a circular variable cross-section column, characterized in that, include: Multiple helical spoilers are wound around a circular variable cross-section column. A support ring is installed in the middle of the column. Two bearings are slidably mounted on the inner wall of the support ring. Spoilers connected to the top and bottom of the column are respectively installed on the sidewalls of the two bearings that are far apart. A compression spring connects the two bearings. A collar is rotatably mounted on the outer circumferential wall of the support ring. A fan blade is circumferentially mounted on the collar with the collar axis as the center. An arc-shaped through groove is provided inside the support ring. A connecting block extending into the arc-shaped through groove is installed on the collar. The connecting block slides within the arc-shaped through groove and is limited. Elastic elements are connected between the opposite sidewalls of the connecting block and the inner wall of the arc-shaped through groove. A gear ring is rotatably mounted inside the support ring. The gear ring is fixedly connected to the connecting block. Rotating the collar allows the gear ring to rotate. A gear meshing with the gear ring is rotatably mounted in the arc-shaped through groove. The gear is coaxially connected to a cam located inside the support ring. Rotation of the gear ring allows the cam to rotate through the gear. The cam is installed between two bearings, and its rotation allows the two bearings to move closer or further apart. A conical spring is installed within the spoiler line, which surrounds the spring. Multiple grooves are circumferentially arranged on the inner ring of each bearing, centered on the bearing axis. A slider is connected to each groove via a spring, and the slider is slidably connected within the groove. Each slider corresponds to a spoiler line. Annular sliding plates, detachably connected to the outer ring of the bearings, are installed on the adjacent sidewalls of the two bearings. These plates are slidably connected to the inner wall of the support ring, and a compression spring is installed between the two annular sliding plates. The cam abuts against the annular sliding plates. Multiple spherical recesses are provided along the extension direction of the spoiler line. Multiple arc-shaped through slots are circumferentially arranged within the support ring, centered on the support ring axis. The diameter of the spherical recesses is 2mm to 5mm. Hoops are installed at the top and bottom of the circular variable cross-section column to fix the spoiler line to the column.

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