CN221683465U - Single-rod viscous damper and vibration damper - Google Patents

Abstract

The application relates to a single-rod viscous damper and a vibration damper, wherein the single-rod viscous damper comprises a cylinder barrel and a piston rod, a piston is arranged in the cylinder barrel, and an air bag is arranged in the piston; one end of the piston rod stretches into the cylinder barrel and is connected with the piston, the other end of the piston rod stretches out of the cylinder barrel, an air inflation hole is formed in the piston rod and communicated with the air bag, and the air bag is arranged at one end far away from the piston rod. Through installing the gasbag at the piston to set up the gas filling hole with the gasbag intercommunication in the piston rod, can be through gas filling hole to aerify in the gasbag, guarantee that the gasbag is moderate in pressure when using, when the relative motion takes place for piston and cylinder, the volume of gasbag can be compressed and shrink or expand, and the gasbag is as volume compensation arrangement, realizes the dynamic balance of piston both sides damping medium volume, has solved the easy asymmetric problem that causes the piston card of attenuator of piston both sides damping medium in the single-rod viscous damper among the related art.

Description

Single-rod viscous damper and vibration damper

Technical Field

The application relates to the field of engineering structure vibration reduction, in particular to a single-rod viscous damper and a vibration reduction device.

Background

At present, the cable vibration is generated under the combined action of wind and rain, and the cable vibration possibly generates larger amplitude, so that the safety of the structure is endangered, and the cable vibration needs to be effectively controlled. The installation of the viscous damper is a common vibration reduction measure, the viscous damper generally comprises a cylinder body, a piston rod, a damping medium, a sealing component and a connecting component, the output force of the damper is related to the vibration speed, the viscous damper only provides damping force for a structure in the working process without providing extra rigidity, and the viscous damper can well absorb the input energy in the structure, so that the structure is effectively protected, and the viscous damper is widely applied.

In the related art, the traditional viscous damper mostly adopts a double-rod structure, the center distance of pin holes of the double-rod damper is longer than that of a single-rod damper, and the difference between the two is approximately equal to twice of the stroke under the condition of the same stroke. In a specific project where the design stroke of the damper is large and the installation space is limited, the dual-rod viscous damper cannot be applied. However, in the prior single-rod damper, a piston moves to one side of the damper along with a piston rod at one side in the use process, and damping mediums at two sides of the piston are easy to be asymmetric in the moving process of the piston, so that the piston of the damper is easy to be blocked.

Therefore, there is a need to design a new single-rod viscous damper to overcome the above-mentioned problems.

Disclosure of utility model

The application provides a single-rod viscous damper, which can solve the technical problem that a piston of the single-rod viscous damper is easy to be blocked due to asymmetric damping mediums at two sides of the piston in the related art.

In a first aspect, embodiments of the present application provide a single output rod viscous damper comprising: the cylinder barrel is internally provided with a piston, and the piston is provided with an air bag; the piston rod, the one end of piston rod stretches into in the cylinder with the piston is connected, and the other end stretches out the cylinder, be provided with in the piston rod and aerify the hole, aerify the hole with the gasbag intercommunication, the gasbag set up in keep away from the one end of piston rod.

The piston rod is connected to one side of the piston in the cylinder barrel, a rodless cavity and a rod cavity are formed in the cylinder barrel, the piston is provided with an overflow hole, one end of the piston rod, which is far away from the air bag, is provided with a first lug plate, one end of the cylinder barrel, which is far away from the piston rod, is provided with a second lug plate, the second lug plate is in threaded connection with the cylinder barrel, the cylinder barrel is close to an end threaded connection end cover of the piston rod, the end cover is provided with an oil outlet, joint bearings are arranged in bearing holes of the first lug plate and the second lug plate, and when the first lug plate and the second lug plate move relatively, the first lug plate drives the piston rod to move, so that the piston moves in the cylinder barrel. When the piston moves leftwards relative to the cylinder barrel, damping medium in the rodless cavity enters the rod cavity through the overflow hole, redundant damping medium in the rodless cavity flows into the piston, and the air bag is compressed and contracted; when the piston moves rightwards relative to the cylinder barrel, damping medium in the rod cavity can enter the rodless cavity through the overflow hole, the volumes of the rodless cavity and the rod cavity are asymmetric, the pressure of the rodless cavity is reduced, at the moment, the air in the air bag enables the volume of the air bag to expand, so that the damping medium in the piston is extruded into the rodless cavity, and the single-rod viscous damper converts vibration energy into heat energy of the damping medium in the damper to dissipate through the overflow of the overflow hole, so that the effects of vibration reduction and energy consumption are achieved.

With reference to the first aspect, in one implementation manner, a cavity is disposed in the piston, and the air bag is installed in the cavity. The air bag is arranged in the cavity of the piston, so that the air bag changes along with the position change of the piston, the occupied space of the air bag is effectively saved, the air bag is protected from being damaged, and in addition, the air bag is arranged in the piston for isolating the rodless cavity and the rod cavity, so that the dynamic balance of the volumes of damping media at two sides of the piston can be realized.

With reference to the first aspect, in one embodiment, the piston is provided with a guide hole, and the piston rod passes through the guide hole to be connected with the air bag, so that the air charging hole is communicated with the air bag. The piston is provided with the guide hole, the piston rod is connected with the piston, the air bag is communicated with the inflation hole in the piston rod, the piston rod is further connected with the air bag by the aid of the piston, connection strength is enhanced, and the rod cavity is isolated, so that tightness of the rodless cavity is guaranteed. The piston rod is threadably connected to the piston through the guide hole.

With reference to the first aspect, in one embodiment, a connecting portion is provided at an end of the piston rod, and the connecting portion extends into the air bag, so that the air bag wraps the connecting portion, and the inflation hole penetrates through the connecting portion. The connecting part protrudes out of the guide hole, the diameter of the connecting part is larger than that of the piston rod, and the connecting part stretches into the air bag to be connected with the air bag effectively and seal the outlet of the air bag, so that the air bag can adjust pressure through the inflation hole.

With reference to the first aspect, in one embodiment, a cushion block is disposed at a corner of the cavity, and the cushion block has an arc-shaped contact surface, and the arc-shaped contact surface is in contact with the airbag. The cushion block is arranged at right angles to two surfaces in contact with the cavity, the cushion block can balance the pressure of the air bag, and the air bag is not damaged by repeated extrusion when the single-rod viscous damper operates at a high speed.

With reference to the first aspect, in one embodiment, a contact surface of the connecting portion and the airbag is provided in an arc shape. The connecting part and the contact surface of the air bag 3 are arc-shaped, and can be matched with the arc-shaped contact surface of the cushion block, so that the arc-shaped surface of the air bag is clamped between the connecting part and the arc-shaped contact surface of the cushion block, and the air bag is prevented from being seriously damaged due to the fact that no support exists in the air bag when the single-output-rod viscous damper operates at a high speed.

With reference to the first aspect, in one embodiment, the inflation hole penetrates from one end of the piston rod to the other end of the piston rod in the axial direction of the piston rod. The inflation hole axially penetrates through the piston rod, and the airbag is directly communicated with the nitrogen pump through the inflation hole in the piston rod under the condition that the airbag needs to be inflated with nitrogen.

With reference to the first aspect, in one embodiment, a first ear plate is screwed to an end of the piston rod, which is far away from the air bag, so that the first ear plate seals the inflation hole. The first lug plate is in threaded connection with the piston rod, the first lug plate is used for plugging the inflation hole under normal conditions, and the first lug plate can be unscrewed and the end part of the piston rod is exposed when the air bag needs to be inflated with nitrogen.

With reference to the first aspect, in one embodiment, an end of the inflation hole away from the airbag is provided with an inflation plug. When the air bag needs to be filled with nitrogen, the first lug plate is unscrewed, then the joint is slowly screwed in, the joint comprises a thimble, the thimble is opened the air plug, the air plug is connected with a nitrogen pump through a hose, the air bag inputs nitrogen with proper pressure through the air charging hole, and the sealing and the opening of the air plug can effectively regulate the pressure of the air bag.

In a second aspect, embodiments of the present application provide a vibration damping device, a cable clip and the single-rod viscous damper mounted to the cable clip. The novel anti-vibration device comprises a first cable clamp and a second cable clamp, wherein the first cable clamp and the second cable clamp are semicircular anchor clamps, the first cable clamp and the second cable clamp hoop an inclined pull rope through bolts, rubber pads are arranged between the first cable clamp and the inclined pull rope as well as between the second cable clamp and the inclined pull rope, the rubber pads are filled in gaps between the first cable clamp and the inclined pull rope as well as between the second cable clamp and the inclined pull rope, the second cable clamp is connected with the single-output-rod viscous damper through a pin shaft, the other end of the single-output-rod viscous damper is connected with an earring seat through the pin shaft, the two single-output-rod viscous dampers can be symmetrically arranged along a central axis by an included angle of 60 degrees, and the vibration damping device comprises two single-output-rod viscous dampers. The single-output-rod viscous damper has the advantages of space saving, full hysteresis curve, good energy consumption performance, stable material performance and the like; the designer can freely adjust the diameter of the overflow hole according to the characteristics of the stay cable so as to adjust the damping coefficient of the single-rod viscous damper; because the single-rod viscous damper is simple in structure and greatly shortened in size, the vibration damper assembled by two single-rod viscous dampers can meet the specific work of limited space.

Specifically, the assembly method of the single-rod viscous damper provided by the application can comprise the following steps:

s1: pushing the piston rod to push the piston to the leftmost end, so that the piston is attached to the second lug plate.

S2: opening the oil filling port and externally connecting an oil pump.

S3: and in the oiling process, the piston slides to the rightmost end, and oiling is completed when the oil outlet continuously discharges oil.

S4: unscrewing the first lug plate, pushing up the inflation plug by using a thimble of the joint, connecting the inflation plug with a nitrogen pump through a hose, closing the inflation plug when the nitrogen inflation of the air bag is completed, and screwing the inflation plug into the first lug plate.

S5: pushing the piston rod to push the piston to the middle position of the cylinder barrel, and sealing the oil filling port and the oil outlet.

The technical scheme provided by the embodiment of the application has the beneficial effects that:

Through installing the gasbag on the piston to set up the gas filling hole with the gasbag intercommunication in the piston rod, can be through gas filling hole to aerify in the gasbag, guarantee that the gasbag is moderate in pressure when using, when the relative motion takes place for piston and cylinder, the volume of gasbag can compress down or expand, and the gasbag is as volume compensation arrangement, realizes the dynamic balance of piston both sides damping medium volume, has solved the easy asymmetric problem that causes the piston card of attenuator of piston both sides damping medium in the single rod viscous damper among the related art.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a single rod viscous damper according to an embodiment of the present application;

FIG. 2 is a front view of a vibration damping device according to an embodiment of the present application;

fig. 3 is a side view of a vibration damping device according to an embodiment of the present application.

In the figure: 1. a cylinder; 11. a rodless cavity; 12. a rod cavity is arranged; 2. a piston; 21. a cavity; 22. a cushion block; 23. an overflow hole; 3. an air bag; 4. a piston rod; 41. an air filling hole; 42. a connection part; 43. inflating plug; 5. a first ear plate; 6. a second ear plate; 61. an oil filling port; 7. an end cap; 71. an oil outlet; 8. a knuckle bearing; 101. a first cable clamp; 102. a second cable clamp; 103. stay cables; 104. a bolt; 105. a rubber pad; 106. a single rod viscous damper; 107. a pin shaft; 108. an earring holder.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The embodiment of the application provides a single-rod viscous damper and a vibration damper, which can solve the technical problem that a piston of the single-rod viscous damper is easy to be blocked due to asymmetric damping mediums at two sides of the piston in the related art.

Referring to fig. 1, an embodiment of the present application provides a single-output-rod viscous damper, which includes: the cylinder barrel 1 is internally provided with a piston 2, and the piston 2 is provided with an air bag 3; the piston rod 4, the one end of piston rod 4 stretches into in the cylinder 1 with piston 2 is connected, and the other end stretches out the cylinder 1, be provided with in the piston rod 4 and aerify hole 41, aerify hole 41 with gasbag 3 intercommunication, gasbag 3 set up in keeping away from the one end of piston rod 4.

In this embodiment, the piston rod 4 is connected to one side of the piston 2 in the cylinder 1, forms rodless chamber 11 and has pole chamber 12 in making the cylinder 1, the piston 2 is equipped with the overflow hole 23, the piston rod 4 is kept away from the one end of gasbag 3 is equipped with first otic placode 5, the cylinder 1 is kept away from the one end of piston rod 4 is equipped with second otic placode 6, second otic placode 6 with cylinder 1 threaded connection, second otic placode 6 is equipped with the oiling mouth 61, the cylinder 1 is close to the one end threaded connection end cover 7 of piston rod 4, end cover 7 is equipped with the oil-out 71, install joint bearing 8 in the bearing hole of first otic placode 5 and second otic placode 6, when first otic placode 5 with second otic placode 6 takes place relative motion, first otic placode 5 drives piston rod 4 motion makes piston 2 moves in cylinder 1.

Wherein, by installing the air bag 3 on the piston 2 and arranging an air charging hole 41 communicated with the air bag 3 in the piston rod 4, the air bag 3 can be inflated through the air charging hole 41, so that the air bag 3 is ensured to have moderate pressure when in use, when the piston 2 moves leftwards relative to the cylinder barrel 1, damping medium in the rodless cavity 11 enters the rod-shaped cavity 12 through the overflow hole 23, redundant damping medium in the rodless cavity 11 flows into the piston 2, and the air bag 3 is compressed and contracted; when the piston 2 moves rightwards relative to the cylinder barrel 1, damping medium in the rod cavity 12 can enter the rodless cavity 11 through the overflow hole 23, the volumes of the rodless cavity 11 and the rod cavity 12 are asymmetric, the pressure of the rodless cavity 11 is reduced, at the moment, the air in the air bag 3 enables the volume of the air bag 3 to expand, so that the damping medium in the piston 2 is extruded into the rodless cavity 11, the air bag 3 serves as a volume compensation device, dynamic balance of the volumes of the damping medium at two sides of the piston 2 is achieved, and the problem that in the single-rod viscous damper in the related art, the damping medium at two sides of the piston 2 is easy to be asymmetric, so that the piston 2 of the damper is blocked is solved. The single-rod viscous damper 106 converts vibration energy into heat energy of a damping medium in the damper to be dissipated through the overcurrent of the overcurrent hole 23, so that the vibration reduction and energy consumption effects are realized.

Further, referring to fig. 1, in some embodiments, a cavity 21 is provided in the piston 2, and the air bag 3 is mounted in the cavity 21. In this embodiment, the air bag 3 is installed in the cavity 21 of the piston 2, so that the air bag 3 changes with the position change of the piston 2, thereby effectively saving the occupied space of the air bag 3 and protecting the air bag 3 from being damaged.

Further, referring to fig. 1, in some embodiments, the piston 2 is provided with a guide hole, and the piston rod 4 is connected to the air bag 3 through the guide hole, so that the air charging hole 41 communicates with the air bag 3. In this embodiment, the guide hole is formed in the piston 2, so that the piston rod 4 is connected to the piston 2, the air bag 3 is further communicated with the air filling hole 41 in the piston rod 4, the piston 2 is used to further connect the piston rod 4 to the air bag 3, the connection strength is enhanced, and the rod cavity 12 is isolated, so that the tightness of the rodless cavity 11 is ensured. Wherein the piston rod 4 is threadably connected to the piston 2 via the guide hole.

Further, referring to fig. 1, in some embodiments, a connecting portion 42 is provided at an end of the piston rod 4, the connecting portion 42 extends into the air bag 3, so that the air bag 3 wraps the connecting portion 42, and the inflation hole 41 penetrates through the connecting portion 42. In this embodiment, the connecting portion 42 protrudes out of the guide hole, and the diameter of the connecting portion 42 is larger than that of the piston rod 4, so that the connecting portion 42 is extended into the air bag 3 to effectively connect with the air bag 3 and seal the outlet of the air bag 3, thereby ensuring that the air bag 3 can adjust the pressure through the air charging hole 41.

Further, referring to fig. 1, in some embodiments, a pad 22 is disposed at a corner of the cavity 21, and the pad 22 has an arc-shaped contact surface, and the arc-shaped contact surface contacts the airbag 3. In this embodiment, two surfaces of the pad 22 contacting the cavity 21 are set to be right angles, the pad 22 can equalize the pressure of the air bag 3, and the air bag 3 is not damaged by repeated extrusion when the single-rod viscous damper 106 operates at high speed.

Further, referring to fig. 1, in some embodiments, the contact surface of the connecting portion 42 with the airbag 3 is configured as an arc shape. In this embodiment, the contact surface of the connecting portion 42 and the air bag 3 is configured to be arc-shaped, and may cooperate with the arc-shaped contact surface of the cushion block 22, so that the arc-shaped surface of the air bag 3 is clamped between the arc-shaped contact surface of the cushion block 22 and the connecting portion 42, so that the air bag 3 is not damaged due to serious internal unsupported deformation when the single-rod viscous damper 106 operates at a high speed.

Further, referring to fig. 1, in some embodiments, the inflation hole 41 penetrates from one end of the piston rod 4 to the other end of the piston rod 4 in the axial direction of the piston rod 4. The inflation hole 41 penetrates through the piston rod 4 in the axial direction, so that the airbag 3 is ensured to be directly communicated with a nitrogen pump through the inflation hole 41 in the piston rod 4 under the condition that the airbag 3 needs to be inflated with nitrogen.

Further, referring to fig. 1, in some embodiments, a first ear plate 5 is screwed to an end of the piston rod 4 away from the air bag 3, so that the first ear plate 5 seals the inflation hole 41. In this embodiment, the first ear plate 5 is screwed to the piston rod 4, in which case the first ear plate 5 seals the inflation hole 41 in a normal case, and the first ear plate 5 can be unscrewed and expose the end of the piston rod 4 when the air bag 3 needs to be inflated with nitrogen.

Further, referring to fig. 1, in some embodiments, an end of the inflation port 41 remote from the airbag 3 is provided with an inflation plug 43. In this embodiment, the inflation plug 43 is generally in a closed state, when the air bag 3 needs to be inflated with nitrogen, the first ear plate 5 is unscrewed, and then the connector is slowly screwed in, the connector includes a thimble, the thimble opens the inflation plug 43, the inflation plug 43 is connected with a nitrogen pump through a hose, the air bag 3 inputs nitrogen with proper pressure through the inflation hole 41, and the closing and opening of the inflation plug 43 can effectively regulate the pressure of the air bag 3.

Referring to fig. 2 and 3, an embodiment of the present application provides a vibration damping device, which includes: a cable clip and the single-rod viscous damper 106 mounted to the cable clip. In this embodiment, the cable clamp includes first cable clamp 101 and second cable clamp 102, first cable clamp 101 with second cable clamp 102 is semi-circular staple bolt, first cable clamp 101 with second cable clamp 102 is through bolt 104 hoops suspension cable 103, first cable clamp 101 with suspension cable 103 and second cable clamp 102 with be equipped with rubber pad 105 between the suspension cable 103, rubber pad 105 fills gap between first cable clamp 101 with suspension cable 103 and second cable clamp 102 with suspension cable 103, second cable clamp 102 passes through round pin axle 107 connection single pole viscous damper 106, the other end of single pole viscous damper 106 passes through round pin axle 107 connection ear ring seat 108, two single pole viscous damper 106 can be set up with the contained angle 60 along the axis symmetry, vibration damper includes two single pole viscous damper 106. The single-output-rod viscous damper 106 has the advantages of space saving, full hysteresis curve, good energy consumption performance, stable material performance and the like; a designer can freely adjust the diameter of the overflow hole 23 according to the characteristics of the stay cable 103 so as to adjust the damping coefficient of the single-rod viscous damper 106; because the single-rod viscous damper 106 has a compact structure and a greatly shortened size, the vibration damper assembled by two single-rod viscous dampers 106 can meet the specific work with limited space.

Specifically, the assembly method of the single-rod viscous damper provided by the application can comprise the following steps:

S1: pushing the piston rod 4 pushes the piston 2 to the leftmost end, so that the piston 2 is attached to the second lug plate 6.

S2: the oil filling port 61 is opened and an oil pump is externally connected.

S3: the piston 2 slides to the rightmost end during the oil injection, and the oil injection is completed when the oil outlet 71 continuously discharges oil.

S4: unscrewing the first ear plate 5, pushing up the inflation plug 43 by using a thimble of the joint, connecting the inflation plug 43 with a nitrogen pump through a hose, closing the inflation plug 43 when the nitrogen inflation of the air bag 3 is completed, and screwing in the first ear plate 5.

S5: pushing the piston rod 4 pushes the piston 2 to the middle position of the cylinder barrel 1, and sealing the oil filling port 61 and the oil outlet 71.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A single output rod viscous damper, comprising:

The cylinder barrel (1), a piston (2) is arranged in the cylinder barrel (1), and an air bag (3) is arranged on the piston (2);

The piston rod (4), the one end of piston rod (4) stretches into in cylinder (1) with piston (2) are connected, and the other end stretches out cylinder (1), be provided with in piston rod (4) and aerify hole (41), aerify hole (41) with gasbag (3) intercommunication, gasbag (3) set up in keeping away from the one end of piston rod (4).

2. Single-rod viscous damper according to claim 1, characterized in that a cavity (21) is provided in the piston (2), the air-bag (3) being mounted in the cavity (21).

3. Single-rod viscous damper according to claim 1, characterized in that the piston (2) is provided with a guide hole through which the piston rod (4) is connected to the air-bag (3), so that the inflation hole (41) communicates with the air-bag (3).

4. A single-rod viscous damper according to claim 3, characterized in that the end of the piston rod (4) is provided with a connecting portion (42), the connecting portion (42) extends into the air bag (3), the air bag (3) wraps the connecting portion (42), and the inflation hole (41) penetrates through the connecting portion (42).

5. Single-rod viscous damper according to claim 2, characterized in that a spacer (22) is provided at the corner of the cavity (21), the spacer (22) having an arcuate contact surface, which is in contact with the airbag (3).

6. Single-rod viscous damper according to claim 4, characterized in that the contact surface of the connecting part (42) with the balloon (3) is arranged in an arc shape.

7. Single-rod viscous damper according to claim 1, characterized in that the inflation hole (41) extends through the piston rod (4) axially from one end of the piston rod (4) to the other end of the piston rod (4).

8. The single-rod viscous damper according to claim 7, characterized in that a first ear plate (5) is screwed to the end of the piston rod (4) remote from the air bag (3), such that the first ear plate (5) seals the air charging hole (41).

9. Single-rod viscous damper according to claim 8, characterized in that the end of the inflation hole (41) remote from the balloon (3) is provided with an inflation plug (43).

10. A vibration damping device, comprising: a cable clip and a single rod viscous damper as claimed in any one of claims 1 to 9 mounted to the cable clip.