Tuned liquid damper for chimney

Abstract

The utility model discloses a tuned liquid damper for a chimney and a model selection method thereof, the damper comprises a plurality of damper units arranged along the periphery of the chimney, each damper unit comprises a plurality of box bodies which are arranged at intervals and used for containing damping liquid, the box bodies arranged along the circumferential direction of the chimney are separated by first separation plates, and the first separation plates are connected with the first separation plates. A plurality of damper units are arranged in the chimney, a first partition plate is arranged in the chimney, circulation holes are formed in the first partition plate, box bodies arranged in the radial direction of the chimney are separated through a second partition plate, communicating holes are formed in the bottom of the second partition plate, box bodies arranged in the longitudinal direction of the chimney are separated through a third partition plate, and the mass ratio of damping liquid in the damper units to the chimney is 1.5-2.0%. The ratio of the height of the damping liquid to the height of the damper unit is 0.3-0.4, and the distance between the circulation hole and the liquid level of the damping liquid is not larger than 0.5 time of the liquid height. According to the tuned liquid damper for the chimney and the type selection method of the tuned liquid damper, the vibration reduction performance of the chimney can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel chimneys, in particular to a tuning liquid damper for chimneys. Background Art

[0002] Chimneys are tall structures. When the frequency of vortex-induced shedding is consistent with the chimney's natural frequency, crosswind resonance will occur, and the structure will produce obvious dynamic response, which is very likely to cause strength damage and fatigue damage, leading to immeasurable safety accidents and economic losses. Therefore, the research and selection of vibration reduction devices for tall steel chimneys is of great value.

[0003] According to the Technical Standards for Chimney Engineering, for tall steel chimneys that experience crosswind vortex-induced resonance and whose Scotton number SC is no more than 15, vibration reduction devices can be installed on the chimneys to avoid excessive deformation or fatigue damage to the chimneys.

[0004] In the prior art, a liquid damper can be installed on the top of the chimney to achieve a vibration reduction effect, but the structure and selection of the damper are difficult to meet the actual vibration reduction requirements. Utility Model Content

[0005] In order to solve the above problems, the utility model aims to provide a tuning liquid damper for a chimney, optimize the selection of the damper, and meet the requirements of chimney vibration reduction.

[0006] Based on the above problems, the technical solution provided by the utility model is:

[0007] A tuned liquid damper for a chimney, comprising a plurality of damper units arranged along the outer periphery of the chimney, the damper units comprising a plurality of boxes arranged in a separated manner for containing damping liquid, the boxes arranged circumferentially along the chimney are separated by a first partition plate, the first partition plate is provided with a flow hole, the boxes arranged radially along the chimney are separated by a second partition plate, the bottom of the second partition plate is provided with a communication hole, and the boxes arranged longitudinally along the chimney are separated by a third partition plate:

[0008] The mass ratio of the damping liquid in the multiple damper units to the mass of the chimney is 1.5-2.0%, the height ratio of the damping liquid to the height of the damper unit is 0.3-0.4, and the distance between the flow hole and the damping liquid surface is not greater than 0.5 times the liquid height.

[0009] In one of the embodiments, the plurality of boxes are arranged in a single layer along the circumference of the chimney, and the plurality of boxes are arranged in a single layer or in multiple layers along the longitudinal direction of the chimney.

[0010] In one of the embodiments, the plurality of boxes are arranged in multiple layers along the circumference of the chimney, and the plurality of boxes are arranged in a single layer or multiple layers along the longitudinal direction of the chimney.

[0011] In one embodiment, the multiple boxes are arranged in a single layer or multiple layers along the circumference of the chimney, and the multiple boxes are arranged in multiple layers along the longitudinal direction of the chimney.

[0012] In one embodiment, the damper unit includes a bottom plate extending along the periphery of the chimney, end plates arranged at both ends of the bottom plate, an inner plate arranged on the inner side of the bottom plate, an outer plate arranged on the outer side of the bottom plate, and an upper cover plate connecting the end plate, the inner plate, and the outer plate.

[0013] In one embodiment, the first partition plate connects the bottom plate, the upper cover plate, the outer plate and the inner plate, the second partition plate connects the bottom plate, the upper cover plate and the end plate, and the third partition plate is arranged between the bottom plate and the upper cover plate and connects the end plate, the inner plate and the outer plate.

[0014] In one of the embodiments, a plurality of reinforcing ribs are provided on the inner sides of the upper cover plate and the third partition plate.

[0015] In one of the embodiments, the ratio of the height of the damping fluid to the distance between the outer plate and the inner plate is 0.1 to 0.12.

[0016] In one of the embodiments, the length of the box along the circumference of the chimney is consistent with the distance between the outer plate and the inner plate.

[0017] In one of the embodiments, the upper cover plate is provided with a liquid filling hole and a vent hole connected to the box body.

[0018] Compared with the prior art, the advantages of the utility model are:

[0019] The structure of the liquid damper provides a proportional relationship between the damping liquid and the chimney, damper box and other structures, ensuring a good vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a structural schematic diagram of a tuning liquid damper for a chimney according to an embodiment 1 of the utility model;

[0022] Figure 2 This is a schematic diagram of the main structure of Embodiment 1 of the present utility model;

[0023] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0024] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present utility model;

[0025] Figure 5 This is a schematic diagram of the structure of Embodiment 4 of the present utility model;

[0026] Figure 6 This is a schematic diagram of the structure of Embodiment 5 of the present utility model;

[0027] Figure 7 This is a schematic diagram of the structure of Embodiment 6 of the present utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the first partition plate in Example 1 of the utility model;

[0029] Fig. 9 This is a schematic diagram of the structure of the second partition plate in Example 3 of the utility model;

[0030] in:

[0031] 1. Chimney;

[0032] 2. Damper unit; 2-1. Bottom plate; 2-2. Outer plate; 2-3. Inner plate; 2-4. Upper cover plate; 2-4a. Liquid adding hole; 2-4b. Air vent; 2-5. End plate; 2-6. First partition plate; 2-6a. Flow; 2-7. Second partition plate; 2-7a. Communication hole; 2-8. Third partition plate; 2-9. Reinforcement rib;

[0033] 3. Support table;

[0034] 4. Blind flange. DETAILED DESCRIPTION

[0035] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the utility model and are not limited to the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0036] See also Figure 1 and Figure 2 , is a tuning liquid damper for chimney of the utility model, comprising two damper units 2 arranged along the periphery of the chimney, the two damper units 2 are connected via a blind flange 4, a support platform 3 is provided on the periphery of the chimney 1, and the damper unit 2 is fixed on the support platform 3. Each damper unit 2 comprises a plurality of boxes which are separated and arranged to contain damping liquid. In this example, the number of boxes in the two damper units 2 is five, and the five boxes are arranged in a single layer along the periphery of the chimney 1. Adjacent boxes are separated by a first partition plate 2-6, and a flow hole 2-6a (such as Figure 8 shown).

[0037] The number of damper units 2 is selected according to the diameter of the chimney 1. Generally, if the diameter of the chimney 1 does not exceed 4 meters, two damper units 2 are designed; if the diameter is greater than 4 meters, three damper units 2 are designed.

[0038] Specifically, the damper unit 2 includes a bottom plate 2-1 extending circumferentially along the chimney 1, end plates 2-5 arranged at both ends of the bottom plate 2-1, an inner plate 2-3 arranged on the inner side of the bottom plate 2-1, an outer plate 2-2 arranged on the outer side of the bottom plate 2-1, and an upper cover plate 2-4 connecting the end plate 2-5, the inner plate 2-3, and the outer plate 2-2. The first partition plate 2-6 connects the bottom plate 2-1, the upper cover plate 2-4, the outer plate 2-2 and the inner plate 2-3, and the damper unit 2 is divided into five boxes by four first partition plates 2-6.

[0039] In order to improve the structural strength of the damper unit 2, a plurality of reinforcing ribs 2-9 are provided on the inner side of the upper cover plate 2-4.

[0040] Preferably, the circumferential length of the box along the chimney 1 is consistent with the spacing between the outer plate 2-2 and the inner plate 2-3, that is, each box is approximately square, ensuring the vibration reduction performance of the crosswind resonance response in all directions.

[0041] In order to facilitate filling the damping liquid into the damper unit 2, a liquid filling port 2-4a and a vent port 2-4b connected to the box body are provided on the upper cover plate 2-4.

[0042] In order to meet the vibration reduction performance, the mass ratio of the damping liquid in the multiple damper units 2 to the mass ratio of the chimney 1 is 1.5-2.0%. According to finite element simulation analysis and experimental verification, the larger the mass ratio, the better the vibration reduction effect. However, when the mass ratio u is greater than 2%, the box width in the damper unit will be too large, affecting transportation and installation, and at the same time increasing the stress of the connection between the damper support and the chimney and the second-order additional bending moment; when the mass ratio is less than 1.5%, the vibration reduction effect is not ideal, so the optimal mass ratio u of the damper is set to 1.5%-2.0%. The ratio of the height of the damping liquid to the height of the damper unit 2 is 0.3-0.4, the distance between the flow hole 26a and the damping liquid surface is not greater than 0.5 times the liquid height, and the ratio of the height of the damping liquid to the spacing between the outer plate 2-2 and the inner plate 2-3 is 0.1-0.12.

[0043] In this example, the ratio of the mass of the damping liquid to the mass of the chimney is set to 2.0%, the ratio of the damper liquid sloshing frequency to the first-order natural frequency of the chimney is 1, the height of the damping liquid is 0.3 times the height of the damper unit 2, and the distance between the flow hole 2-6a on the first partition plate 2-6 and the liquid surface is 0.5 times the liquid height. It is verified by the scaled experiment that the chimney damping ratio becomes 5.0 times of the original value, and the amplitude of the top of the chimney 1 can be reduced by 70%.

[0044] like Figure 3 As shown, it is a schematic diagram of the structure of Example 2 of the utility model. The rest is the same as Example 1, except that: the number of boxes in the two damper units 2 is not equal, one damper unit 2 includes five boxes, and the other damper unit 2 includes six boxes.

[0045] In this example, the ratio of the mass of the damping liquid to the mass of the chimney 1 is set to 1.9%, the ratio of the damper liquid sloshing frequency to the first-order natural frequency of the chimney is 1, the height of the damping liquid is 0.3 times the height of the damper unit 2, and the distance between the flow hole 2-6a on the first partition plate 26 and the liquid surface is 0.5 times the liquid height. It is verified by the scaled experiment that the chimney damping ratio becomes 5.3 times of the original value, and the amplitude of the top of the chimney 1 can be reduced by 73%.

[0046] like Figure 4 As shown, it is a schematic diagram of the structure of Example 3 of the utility model. The rest is the same as Example 2, except that: one of the damper units 2 is arranged in two layers along the chimney 1 in the annular direction, that is, the boxes arranged radially along the chimney 1 are separated by the second partition plate 2-7, the second partition plate 2-7 is arranged in the annular direction of the chimney 1, and connects the bottom plate 2-1, the upper cover plate 2-4 and the end plate 2-5, and more first partition plates 2-6 are set at the same time, each first partition plate 2-6 is connected to the second partition plate 2-7, the outer plate 2-2 / the inner plate 2-3, and the damper unit 2 is divided into twenty small boxes, and a rectangular connecting hole 2-7a (such as Fig. 9 The other damper unit includes six large boxes.

[0047] Correspondingly, a liquid adding hole 2-4a and a vent hole 24b connected to the upper box and the lower box are provided on the upper cover plate 2-4, wherein the liquid adding hole 24a and the vent hole 24b connected to the lower box are provided with a connecting pipe extending into the lower box.

[0048] In this example, the ratio of the mass of the damping liquid to the mass of the chimney 1 is set to 1.8%, the ratio of the damper liquid sloshing frequency to the first-order natural frequency of the chimney is 1, the height of the damping liquid is 0.3 times the height of the damper unit 2, and the distance between the flow hole 2-6a on the first partition plate 2.6 and the liquid surface is 0.5 times the liquid height. It is verified by the scaled experiment that the chimney damping ratio becomes 6.0 times of the original value, and the amplitude of the top of the chimney 1 can be reduced by 80%.

[0049] like Figure 5As shown, it is a schematic diagram of the structure of Example 4 of the utility model. The rest is the same as Example 3, except that: the two damper units 2 are arranged in two layers along the chimney 1 in a circumferential direction, one damper unit 2 includes twenty small boxes, and the other damper unit 2 includes twenty-four small boxes.

[0050] In this example, the ratio of the mass of the damping liquid to the mass of the chimney 1 is set to 1.7%, the ratio of the damper liquid sloshing frequency to the first-order natural frequency of the chimney is 1, the height of the damping liquid is 0.3 times the height of the damper unit 2, and the distance between the flow hole 2-6a on the first partition plate 2-6 and the liquid surface is 0.5 times the liquid height. It is verified by the scaled experiment that the chimney damping ratio becomes 6.7 times the original value, and the amplitude of the top of the chimney 1 can be reduced by 85%.

[0051] like Figure 6 As shown, it is a schematic diagram of the structure of Example 5 of the utility model. The rest is the same as Example 1, except that: the two damper units 2 are arranged in two layers longitudinally, and the circumferential direction includes a single-layer and a two-layer structure. The upper box body and the lower box body are separated by a third partition plate 2-8, and the third partition plate 2-8 connects the outer plate 2-2, the inner plate 2-3 and the end plate 2-5. One damper unit 2 includes five large boxes on the upper layer and twenty small boxes on the lower layer, and the other damper unit 2 includes six large boxes on the upper layer and twenty-four small boxes on the lower layer.

[0052] In order to improve the strength of the damper unit 2, reinforcing ribs are provided on the lower side of the third partition plate 2-8.

[0053] In this example, the ratio of the mass of the damping liquid to the mass of the chimney is set to 1.6%, the ratio of the damper liquid sloshing frequency to the first-order natural frequency of the chimney is 1, the height of the damping liquid is 0.3 times the height of the damper unit 2, and the distance between the flow hole 2-6a on the first partition plate 2-6 and the liquid surface is 0.5 times the liquid height. It is verified by the scaled experiment that the chimney damping ratio becomes 7.5 times of the original value, and the amplitude of the top of the chimney 1 can be reduced by 87%.

[0054] like Figure 7 As shown, it is a schematic diagram of the structure of Example 6 of the utility model. The rest is the same as Example 5, except that: the two units are arranged in two layers longitudinally and in two layers circumferentially, one damper unit 2 includes twenty small boxes on the upper layer and twenty small boxes on the lower layer, and the other damper unit 2 includes twenty-four small boxes on the upper layer and twenty-four small boxes on the lower layer.

[0055] In this example, the ratio of the mass of the damping liquid to the mass of the chimney is set to 1.5%, the ratio of the damper liquid sloshing frequency to the first-order natural frequency of the chimney is 1, the height of the damping liquid is 0.3 times the height of the damper unit 2, and the distance between the flow hole 2-6a on the first partition plate 2-6 and the liquid surface is 0.5 times the liquid height. It is verified by the scaled experiment that the chimney damping ratio becomes 8.5 times of the original value, and the amplitude of the top of the chimney 1 can be reduced by 92%.

[0056] In summary, the liquid damper can improve the vibration reduction performance and ensure the structural stability and safety of the chimney.

[0057] The above examples are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A tuned liquid damper for a chimney, characterized in that: The invention comprises a plurality of damper units arranged along the outer periphery of the chimney, wherein the damper units comprise a plurality of boxes arranged in a separated manner for containing damping liquid, the boxes arranged in the circumferential direction of the chimney are separated by a first partition plate, the first partition plate is provided with a flow hole, the boxes arranged in the radial direction of the chimney are separated by a second partition plate, the bottom of the second partition plate is provided with a communication hole, and the boxes arranged in the longitudinal direction of the chimney are separated by a third partition plate: The mass ratio of the damping liquid in the multiple damper units to the mass of the chimney is 1.5-2.0%, the height ratio of the damping liquid to the height of the damper unit is 0.3-0.4, and the distance between the flow hole and the damping liquid surface is not greater than 0.5 times the liquid height.

2. The chimney tuned liquid damper according to claim 1, characterized in that: The multiple boxes are arranged in a single layer along the circumference of the chimney, and the multiple boxes are arranged in a single layer or in multiple layers along the longitudinal direction of the chimney.

3. The chimney tuned liquid damper according to claim 1, characterized in that: The multiple boxes are arranged in multiple layers along the circumference of the chimney, and the multiple boxes are arranged in a single layer or multiple layers along the longitudinal direction of the chimney.

4. The chimney tuned liquid damper according to claim 1, characterized in that: The multiple boxes are arranged in a single layer or multiple layers along the circumference of the chimney, and the multiple boxes are arranged in multiple layers along the longitudinal direction of the chimney.

5. The chimney tuned liquid damper according to claim 1, characterized in that: The damper unit includes a bottom plate extending along the outer periphery of the chimney, end plates arranged at both ends of the bottom plate, an inner plate arranged on the inner side of the bottom plate, an outer plate arranged on the outer side of the bottom plate, and an upper cover plate connecting the end plates, the inner plates, and the outer plates.

6. The chimney tuned liquid damper according to claim 5, characterized in that: The first partition plate connects the bottom plate, the upper cover plate, the outer plate and the inner plate, the second partition plate connects the bottom plate, the upper cover plate and the end plate, and the third partition plate is arranged between the bottom plate and the upper cover plate and connects the end plate, the inner plate and the outer plate.

7. The chimney tuned liquid damper according to claim 5, characterized in that: A plurality of reinforcing ribs are arranged on the lower sides of the upper cover plate and the third partition plate.

8. The chimney tuned liquid damper according to claim 5, characterized in that: The ratio of the height of the damping fluid to the distance between the outer plate and the inner plate is 0.1 to 0.

12.

9. The chimney tuned liquid damper according to claim 5, characterized in that: The length of the box body along the circumference of the chimney is consistent with the distance between the outer plate and the inner plate.

10. The chimney tuned liquid damper according to claim 5, characterized in that: The upper cover plate is provided with a liquid adding hole and a vent hole connected to the box body.

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