Multi-stage simple pendulum type tuned mass damping device and fan

Abstract

The utility model relates to the technical field of vibration reduction, in particular to a multistage simple pendulum type tuned mass damping device and a fan. The multistage simple pendulum type tuned mass damping device comprises a stand column, at least three first swing pieces, at least three second swing pieces, a mass block and an open container. Wherein the at least three first swing pieces are arranged at intervals in the circumferential direction of the stand column, one ends of the first swing pieces are used for being connected with a to-be-damped piece, and the other ends are connected with the bottom end of the stand column; the at least three second swing pieces are arranged at intervals in the circumferential direction of the stand column and are arranged at intervals with the first swing pieces, and the top ends of the second swing pieces are connected with the top end of the stand column; the mass block is arranged at the bottom end of the second swing piece; the open container is arranged below the stand column and used for containing damping liquid to provide damping for the mass block. The problem that in the prior art, for the low-frequency control requirement, a single-pendulum type vibration reduction device needs a very long swing rod, and installation of the whole damping device is not facilitated can be solved.

Description

Technical Field

[0001] This utility model relates to the field of vibration reduction technology, specifically to a multi-stage pendulum tuned mass damping device and a fan. Background Technology

[0002] Most wind turbines are installed in hilly, uninhabited, and open plains areas, where the working environment is harsh. Furthermore, since the height of wind turbine towers has reached 70-90 meters, and even exceeded 130 meters, installation and maintenance are extremely inconvenient. Active and semi-active control dampers have too high technical requirements and rely too much on controllers, sensors, and other components, increasing the probability of damper failure. Therefore, vibration reduction devices such as ATMD, TLD, PTMD, and EHATMD are not currently suitable for vibration control of wind turbine towers.

[0003] Furthermore, as wind turbine towers become taller, their vibration frequencies also decrease, reaching as low as 0.1Hz. Moreover, as the blades adapt to different wind directions, they must meet the requirements for horizontal vibration in all directions. Spring-mass damper (TMD) systems offer only one direction of control, and designing springs for ultra-low frequencies is difficult, as the spring's elastic force cannot overcome the friction at the bottom of the mass. In contrast, pendulum-type TMDs control the frequency... In the formula, g is the acceleration due to gravity and l is the pendulum length. When the control frequency of the single pendulum TMD is as low as 0.1Hz, the pendulum length will reach 24.82m, which will seriously affect the stability of the TMD structure and the installation space.

[0004] Therefore, for low-frequency control requirements, a single pendulum damping device requires a very long pendulum rod, which is not conducive to the installation of the entire damping device. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a multi-stage pendulum-type tuned mass damping device and a fan, which can solve the problem in existing technologies where low-frequency control requirements necessitate a long pendulum rod for pendulum-type damping devices, making installation of the entire damping device difficult.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] On one hand, the present invention provides a multi-stage pendulum-type tuned mass damping device, comprising:

[0008] Columns;

[0009] At least three first ornamental members are arranged at intervals along the circumference of the column. One end of the first ornamental member is used to connect to the vibration damping member, and the other end is connected to the bottom end of the column.

[0010] At least three second ornaments are arranged at intervals along the circumference of the column and at intervals from the first ornament, and the top of the second ornament is connected to the top of the column.

[0011] A mass block is located at the bottom of the second ornament;

[0012] An open container, located below the column, is used to hold damping fluid to provide damping for the mass block.

[0013] In some alternative embodiments, the column includes:

[0014] Column;

[0015] The upper support includes the same number of upper legs as the second ornament, each used to connect to the second ornament;

[0016] The lower support includes the same number of lower legs as the first ornaments, each used to connect to the first ornament;

[0017] The upper and lower supports are arranged along the radial direction of the column.

[0018] In some alternative solutions, both the upper and lower supports further include connecting sleeves, which are fitted onto the column body for connecting the outriggers.

[0019] In some alternative designs, the column is a telescopic column, and the lengths of the first and second ornaments are adjustable.

[0020] In some alternative designs, the damping device includes three first pendulum members and three second pendulum members, with the two first pendulum members circumferentially spaced 120° apart, the two second pendulum members circumferentially spaced 120° apart, and the first pendulum members and the second pendulum members circumferentially spaced 60° apart.

[0021] In some alternative embodiments, the mass block has a filling space inside for filling with mass fluid.

[0022] In some alternative designs, the first and second pendulum components are rigid pendulum rods with universal joints at both ends.

[0023] In some alternative solutions, the damping device also includes a damping fluid adjustment mechanism connected to the open container for adjusting the depth of the damping fluid within the open container.

[0024] In some alternative embodiments, the damping fluid adjustment mechanism includes a damping fluid regulator and a damping fluid container. The damping fluid container is used to hold the damping fluid, and the regulator is connected to the damping fluid container and an open container via a pipe to adjust the depth of the damping fluid in the open container.

[0025] On the other hand, the present invention also provides a fan, comprising: the multi-stage pendulum tuned mass damping device described in any of the above claims.

[0026] Compared with existing technologies, the advantages of this invention are as follows: one end of the first pendulum component is connected to the component to be damped, and the other end is connected to the bottom end of the column; the top end of the second pendulum component is connected to the top end of the column; a mass block is located at the bottom end of the second pendulum component; and an open container is located below the column to hold damping fluid to provide damping for the mass block. This method increases the pendulum length within a shorter vertical space, thereby controlling low-frequency vibrations. Furthermore, this design uses at least three pendulum components in each stage, which improves the overall stability of the pendulum. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the multi-stage pendulum tuned mass damping device in the embodiments of this utility model;

[0029] Figure 2 This is a schematic diagram of the damping device in the embodiment of this utility model;

[0030] Figure 3 This is a schematic diagram of the damping device in the embodiment of this utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the column in this embodiment of the utility model.

[0032] In the diagram: 1. First ornament; 2. Column; 21. Column body; 22. Upper support; 221. Upper support leg; 23. Lower support; 231. Lower support leg; 3. Second ornament; 4. Mass block; 5. Open container; 6. Damping fluid adjustment mechanism; 61. Damping fluid regulator; 62. Damping fluid container. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 and Figure 2 As shown, on the one hand, this utility model provides a multi-stage pendulum tuned mass damping device, including: a column 2, at least three first pendulum members 1, at least three second pendulum members 3, a mass block 4, and an open container 5;

[0036] Among them, at least three first pendulum members 1 are arranged at intervals along the circumference of the column 2, one end of the first pendulum member 1 is used to connect to the vibration damping component, and the other end is connected to the bottom end of the column 2; at least three second pendulum members 3 are arranged at intervals along the circumference of the column 2 and are spaced apart from the first pendulum members 1, and the top end of the second pendulum member 3 is connected to the top end of the column 2; a mass block 4 is located at the bottom end of the second pendulum member 3; an open container 5 is located below the column 2 and is used to hold damping fluid to provide damping for the mass block 4.

[0037] When using this multi-stage pendulum-type tuned mass damping device, one end of the first pendulum 1 is connected to the component to be damped, and the other end is connected to the bottom end of the column 2. The top end of the second pendulum 3 is connected to the top end of the column 2. The mass block 4 is located at the bottom end of the second pendulum 3. An open container 5 is located below the column 2 to hold damping fluid to provide damping for the mass block 4. This method can increase the pendulum length within a shorter vertical space to control low-frequency vibrations. Furthermore, this scheme uses at least three pendulum components in each stage, which can improve the overall stability of the pendulum.

[0038] In this example, the first pendant 1 and the second pendant 3 are staggered to avoid mutual interference between the first pendant 1 and the second pendant 3 when the mass block 4 swings, which would affect the vibration reduction effect.

[0039] like Figure 3 As shown, the effective pendulum length L after introducing a multi-stage pendulum is L = l1 + l2 + l6 = l3 + 2l4 + l5 + l6, where l1 is the pendulum length of the first pendulum 1, l2 is the pendulum length of the second pendulum 3, l6 is the distance from the center of gravity of the mass block 4 to the top, l1 + l2 = l3 + 2l4 + l5, l3 is the distance from the top of the column 2 to the connection point between the first pendulum 1 and the vibration damping component, l4 is the height of the column 2, and l5 is the distance from the bottom of the column 2 to the mass block 4. It can be seen that introducing a multi-stage pendulum can effectively reduce the pendulum length.

[0040] With a target frequency of 0.19Hz, if a conventional simple pendulum TMD is used, the corresponding pendulum length is L0 = g / (2πf). 2 =6.88m; For the TLMD case, take With L = 2.29m, the pendulum length can be effectively reduced, making the space for damper arrangement more compact.

[0041] After introducing the second-stage pendulum, with l3 = 0.1m, l4 = 1.0m, l5 = 0.1m, and l6 = 0.09m, the length of the first-stage pendulum is l1 = 1.1m, the length of the second-stage pendulum is l2 = 1.1m, and the total pendulum length space is l3 + l4 + l5 = 1.2m. It can be seen that the installation space of the damper can be effectively reduced. The installation space corresponding to the traditional single pendulum TMD control frequency of 0.19Hz can be reduced from 6.88mm to 1.2m, making the damper installation space more compact and saving space.

[0042] like Figure 4 As shown, in some optional embodiments, the column 2 includes: a column body 21, an upper support 22, and a lower support 23; the upper support 22 includes the same number of upper legs 221 as the second ornament 3, which are used to connect the second ornament 3 respectively; the lower support 23 includes the same number of lower legs 231 as the first ornament 1, which are used to connect the first ornament 1 respectively, and the upper support 22 and the lower support 23 are arranged along the radial direction of the column body 21.

[0043] In this embodiment, by setting an upper support 22 and a lower support 23 at the upper and lower ends of the column 21, and setting the upper support leg 221 of the upper support 22 and the lower support leg 231 of the lower support 23 along the radial direction of the column 21 and extending out of the column 21, connecting the second swing member 3 to the extended end of the upper support leg 221, and connecting the first swing member 1 to the extended end of the lower support leg 231, the first swing member 1 and the second swing member 3 can be spaced apart from the column 21. When the mass block 4 swings, the first swing member 1 and the second swing member 3 will not interfere with the column 21, thereby improving the vibration reduction effect.

[0044] In some optional embodiments, both the upper support 22 and the lower support 23 further include a connecting sleeve, which is sleeved on the column 21 and used to connect the support leg.

[0045] In this embodiment, the column 21 is cylindrical, and the connecting sleeve is cylindrical. The upper bracket 22 and the lower bracket 23 are respectively set on the side wall outside the corresponding connecting sleeve. During installation, the connecting sleeves corresponding to the upper bracket 22 and the lower bracket 23 are fitted onto the two ends of the column 21 and connected by bolts to realize the connection between the upper bracket 22 and the lower bracket 23 and the column 21. This design facilitates the installation of the upper bracket 22 and the lower bracket 23 and improves the installation efficiency.

[0046] In some alternative embodiments, the column 21 is a telescopic column, and the lengths of the first ornament 1 and the second ornament 3 are adjustable.

[0047] In this embodiment, the column 21 is a telescopic column, which can be designed like an umbrella pole to achieve telescopic movement. Combined with the adjustable lengths of the first pendulum component 1 and the second pendulum component 3, the length of the entire pendulum can be adjusted to meet different vibration reduction frequency requirements. If the first pendulum component 1 and the second pendulum component 3 are ropes, their lengths can be adjusted by changing the telescopic length. Alternatively, the first pendulum component 1 and the second pendulum component 3 can be rigid pendulum rods, designed as telescopic rods, such as umbrella poles, which also allows for adjustable lengths.

[0048] In some optional embodiments, the multi-stage pendulum tuned mass damping device includes three first pendulum members 1 and three second pendulum members 3, with the two first pendulum members 1 circumferentially spaced 120° apart, the two second pendulum members 3 circumferentially spaced 120° apart, and the first pendulum members 1 and the second pendulum members 3 circumferentially spaced 60° apart.

[0049] In this embodiment, both the first ornament 1 and the second ornament 3 are made of three pieces, and the corresponding support legs are also made of three pieces, which are evenly spaced to ensure the stability of the column 2 when it swings.

[0050] In other embodiments, the first ornament 1 and the second ornament 3 can also be in the form of four pieces, with the four first ornament 1 pieces and the four second ornament 3 pieces spaced 90° apart, and the circumferential spacing between the first ornament 1 pieces and the second ornament 3 pieces 45°. Such a design can also achieve the same effect.

[0051] In some alternative embodiments, the mass block 4 has a filling space inside for filling with mass fluid.

[0052] In this example, a filling space is provided inside the mass block 4. The mass of the mass block 4 can be adjusted by adding or removing mass fluid in the filling space, thereby adjusting the control frequency of the entire damping device.

[0053] In some alternative embodiments, the first pendulum 1 and the second pendulum 3 are rigid pendulum rods with universal hinges at both ends.

[0054] In this example, both the first pendulum 1 and the second pendulum 3 are rigid pendulum rods. In order to make the first pendulum 1 and the second pendulum 3 swing when the mass block 4 swings, they are provided at both ends of the first pendulum 1 and the second pendulum 3. The rigid pendulum rods are connected to the corresponding components through universal joints (ball joints or cross couplings). The rigid pendulum rods can be pulled and compressed, and have better overall stability.

[0055] In some optional embodiments, the multi-stage pendulum tuned mass damping device further includes a damping fluid adjustment mechanism 6, which is connected to the open container 5 and is used to adjust the depth of the damping fluid in the open container 5.

[0056] When it is necessary to adjust the control frequency of the entire damping device, the damping fluid depth in the open container 5 is adjusted by the damping fluid adjustment mechanism 6. For example, if it is necessary to lower the control frequency of the entire damping device, damping fluid is added to the open container 5 by the damping fluid adjustment mechanism 6, causing the damping fluid level in the open container 5 to rise. If it is necessary to raise the control frequency of the entire damping device, damping fluid is withdrawn from the open container 5 by the damping fluid adjustment mechanism 6, causing the damping fluid level in the open container 5 to fall.

[0057] In some optional embodiments, the damping fluid adjustment mechanism 6 includes a damping fluid regulator 61 and a damping fluid container 62. The damping fluid container 62 is used to hold the damping fluid, and the damping fluid regulator 61 is connected to the damping fluid container 62 and the open container 5 through a pipe to adjust the depth of the damping fluid in the open container 5.

[0058] Specifically, if it is necessary to reduce the control frequency of the entire damping device, the damping fluid regulator 61 draws damping fluid from the damping fluid container 62 through a pipe and adds it to the open container 5, thereby raising the level of the damping fluid in the open container 5. If it is necessary to increase the control frequency of the entire damping device, the damping fluid regulator 61 draws damping fluid from the open container 5 through a pipe and adds it to the damping fluid container 62, thereby lowering the level of the damping fluid in the open container 5.

[0059] In some alternative embodiments, the damping fluid regulator 61 includes a bidirectional pump or a cooperating discharge pump and extraction pump.

[0060] In this example, the damping fluid regulator 61 includes a bidirectional pump that connects the damping fluid container 62 and the open container 5 via a pipe; or an extraction pump that connects the damping fluid container 62 and the open container 5 via a pipe for adding damping fluid from the damping fluid container 62 to the open container 5, and a discharge pump that connects the damping fluid container 62 and the open container 5 via a pipe for discharging damping fluid from the open container 5 to the damping fluid container 62 in the open container 5.

[0061] On the other hand, this utility model also provides a fan, and any of the above-mentioned multi-stage pendulum tuned mass damping devices.

[0062] In summary, if the multi-stage pendulum tuned mass damping device is installed inside the fan, an installation plate can be installed inside the fan casing. The installation plate is connected to the inner wall of the fan casing, and a support plate is set below the installation plate for installing and fixing the open container 5.

[0063] When using this multi-stage pendulum-type tuned mass damping device, the upper end of the first pendulum component 1 is connected to the mounting plate, and the other end is connected to the bottom end of the column 2. The top end of the second pendulum component 3 is connected to the top end of the column 2. The mass block 4 is located at the bottom end of the second pendulum component 3. An open container 5 is located below the column 2 to hold damping fluid to provide damping for the mass block 4. This method can increase the pendulum length within a shorter vertical space to control low-frequency vibrations. Furthermore, this design uses multiple pendulum components in each stage, which improves the overall stability of the pendulum.

[0064] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not 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 application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0065] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0066] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A multi-stage pendulum-type tuned mass damping device, characterized in that, include: Column (2); At least three first ornaments (1) are arranged at intervals along the circumference of the column (2). One end of the first ornament (1) is used to connect to the vibration damping component, and the other end is connected to the bottom end of the column (2). At least three second ornaments (3) are arranged at intervals along the circumference of the column (2) and at intervals from the first ornament (1), and the top of the second ornament (3) is connected to the top of the column (2). Mass block (4), which is located at the bottom end of the second ornament (3); An open container (5), located below the column (2), is used to hold damping fluid to provide damping for the mass block (4).

2. The multi-stage pendulum-type tuned mass damping device as described in claim 1, characterized in that, The column (2) includes: Column (21); The upper support (22) includes the same number of upper legs (221) as the second ornament (3), which are used to connect the second ornament (3); The lower support (23) includes the same number of lower support legs (231) as the first ornament (1), which are used to connect the first ornament (1); The upper support (22) and the lower support (23) are arranged along the radial direction of the column (21).

3. The multi-stage pendulum-type tuned mass damping device as described in claim 2, characterized in that, Both the upper support (22) and the lower support (23) further include a connecting sleeve, which is sleeved on the column (21) and used to connect the support leg.

4. The multi-stage pendulum-type tuned mass damping device as described in claim 2, characterized in that, The column (21) is a telescopic column, and the lengths of the first ornament (1) and the second ornament (3) are adjustable.

5. The multi-stage pendulum-type tuned mass damping device as described in claim 1, characterized in that, It includes three first ornaments (1) and three second ornaments (3), with the two first ornaments (1) spaced 120° apart in the circumference, the two second ornaments (3) spaced 120° apart in the circumference, and the first ornaments (1) and the second ornaments (3) spaced 60° apart in the circumference.

6. The multi-stage pendulum-type tuned mass damping device as described in claim 1, characterized in that, The mass block (4) has a filling space inside for filling mass fluid.

7. The multi-stage pendulum-type tuned mass damping device as described in claim 1, characterized in that, The first pendulum (1) and the second pendulum (3) are rigid pendulum rods with universal joints at both ends.

8. The multi-stage pendulum-type tuned mass damping device as described in claim 1, characterized in that, It also includes a damping fluid adjustment mechanism (6), which is connected to the open container (5) and is used to adjust the depth of the damping fluid in the open container (5).

9. The multi-stage pendulum-type tuned mass damping device as described in claim 8, characterized in that, The damping fluid adjustment mechanism (6) includes a damping fluid regulator (61) and a damping fluid container (62). The damping fluid container (62) is used to hold the damping fluid. The damping fluid regulator (61) is connected to the damping fluid container (62) and the open container (5) through a pipe and is used to adjust the depth of the damping fluid in the open container (5).

10. A fan, characterized in that, include: The multi-stage pendulum tuned mass damping device as described in any one of claims 1-9.

Images