Damping device and composite interphase spacer

Abstract

The utility model provides a kind of damping device and composite phase-to-phase spacer. The damping device includes body (14) and piston, piston includes first piston (21) and second piston (22), first piston (21) is inserted into body (14) from the first end of body (14), second piston (22) is inserted into body (14) from the second end of body (14), in body (14), closed damping cavity (11) is formed between first piston (21) and second piston (22). The damping device and composite phase-to-phase spacer provided by the utility model can solve the problem of short service life of the spring damping device of the existing phase-to-phase spacer and gradually decreasing of the buffering effect.

Description

Technical Field

[0001] This utility model relates to the field of interphase spacer buffer technology, and more specifically, to a damping device and a composite interphase spacer. Background Technology

[0002] Phase-to-phase galloping is a common phenomenon in overhead transmission lines, especially when the line crosses areas with uneven wind speeds. This galloping can cause violent swaying of the conductors, leading to phase-to-phase flashovers or conductor breakage, posing a serious threat to power grid safety. Existing composite phase-to-phase spacers, as an effective anti-galloping measure, are typically designed with rigid connections and lack sufficient stress buffering mechanisms. When subjected to extreme galloping, the phase-to-phase composite insulators of these spacers are prone to excessive bending stress, leading to structural damage or even failure.

[0003] To avoid damage to the spacer structure caused by stress from extreme conductor galloping, patent CN104979790B discloses a spring damping device for phase-to-phase spacers. This patent connects the phase-to-phase spacer composite insulator and line hardware via a spring cylinder with a piston-type shaft and a spring. When the conductor gallops, stretching or compressing the phase-to-phase spacer, the piston-type shaft transfers the tension or compression energy of the spacer to the spring. The compression and reset of the spring dissipate and buffer the energy generated by the galloping, thereby reducing the possibility of stress concentration in the phase-to-phase spacer and protecting it, extending its service life. However, during repeated compression and reset, the spring gradually fatigues and fails, resulting in a short lifespan for the spring damping structure. Furthermore, as the spring fatigues, the buffering effect gradually decreases, eventually causing the damping device to lose its buffering effect. Utility Model Content

[0004] The main purpose of this invention is to provide a damping device and a composite interphase spacer bar, which can solve the problems of short lifespan and gradually decreasing buffering effect of existing interphase spacer bar spring damping devices.

[0005] To achieve the above objectives, according to one aspect of the present invention, a damping device is provided, comprising a body and a piston, the piston comprising a first piston and a second piston, the first piston extending into the body from a first end of the body, and the second piston extending into the body from a second end of the body, wherein a closed damping cavity is formed between the first piston and the second piston within the body.

[0006] Furthermore, both the first piston and the second piston include a piston rod and a piston head. The piston rod extends axially into the body and is connected to the piston head. A connecting fitting is provided at the end of the piston rod away from the piston head.

[0007] Furthermore, an end plate is provided at the end of the main body, and the piston rod passes through the end plate. A limiting cavity is formed between the end plate and the piston head. An elastic element is provided in the limiting cavity, and the elastic element is sleeved on the piston rod. The two ends of the elastic element abut against the end plate and the piston head, respectively.

[0008] Furthermore, the damping cavity is filled with a buffer fluid, which may include gas, water, or oil.

[0009] According to another aspect of the present invention, a composite phase-to-phase spacer is also provided. The composite phase-to-phase spacer further includes a plurality of phase-to-phase insulators. The composite phase-to-phase spacer includes the aforementioned damping device. The damping device is disposed between two adjacent phase-to-phase insulators. The damping device can buffer the interaction force between two adjacent phase-to-phase insulators.

[0010] Furthermore, a monitoring unit is provided on the phase-to-phase insulator, which can monitor the status of the phase-to-phase insulator.

[0011] Furthermore, the phase-to-phase insulator includes a core rod, and the monitoring unit includes a sensing optical fiber wound around the core rod.

[0012] Furthermore, the phase-to-phase insulator also includes a sheath layer sleeved on the core rod, with sensing optical fibers wound between the sheath layer and the core rod.

[0013] Furthermore, the ends of the phase-to-phase insulators are provided with end fittings, and when the piston is provided with connecting fittings, the end fittings are connected to the connecting fittings.

[0014] Furthermore, the composite phase-to-phase spacer also includes an equipotential line, which is positioned between the phase-to-phase insulator and the damping device.

[0015] Applying the technical solution of this utility model, the first piston and the second piston are used to transmit the impact force generated by the external spacer structure during galloping to the closed damping cavity formed between the first piston and the second piston. The main body, as the structural frame of the damping device, accommodates and supports components such as the piston and guides the reciprocating motion of the piston. Together with the first and second pistons, it forms a closed damping cavity, allowing it to accommodate buffer fluids such as oil, water, or high-pressure gas, preventing leakage. The piston responds to the inward compression and outward tension stress of the conductor. When the conductor gallops, the first or second piston transmits the inward pressure to the damping cavity. The fluid or gas in the damping cavity is compressed and simultaneously generates a reverse fluid pressure on the piston, thus buffering the inward pressure generated by the conductor galloping. Similarly, when the piston is pulled outward under external force, the fluid or gas in the damping cavity generates a force opposite to the pulling force to resist the outward movement of the piston, thus buffering the tensile force. This bidirectional damping design effectively addresses the buffering requirements of the composite spacer under extreme galloping conditions, providing more comprehensive stress buffering. This invention utilizes a closed damping cavity formed by the cooperation of a first and second piston to dampen and buffer the galloping of phase spacers. Compared to conventional damping devices that primarily rely on springs, fluid damping is more stable and less prone to fatigue failure, maintaining effective damping for a longer period and extending the service life of the damping device. This damping device effectively buffers the stress caused by conductor galloping, helping to reduce the risk of damage to phase spacers, minimizing line faults caused by galloping, improving the safety and reliability of transmission lines, and reducing maintenance costs. Attached Figure Description

[0016] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 A schematic diagram of the overall structure of the composite phase spacer of this utility model is shown;

[0018] Figure 2 This is a front view of the phase-to-phase insulator with composite phase-to-phase spacer bars according to the present invention;

[0019] Figure 3 A cross-sectional view of the damping device of this utility model is shown.

[0020] The above figures include the following reference numerals:

[0021] 1. Damping device; 11. Damping cavity; 12. End plate; 13. Limiting cavity; 14. Body; 21. First piston; 22. Second piston; 31. Piston rod; 32. Piston head; 34. Connecting hardware; 4. Elastic element; 5. Phase-to-phase insulator; 51. Core rod; 52. Sheath layer; 53. End hardware; 6. Monitoring unit; 7. Equipotential line; 8. Sub-conductor spacer bar; 91. Equalizing ring for phase-to-phase insulator; 92. Equalizing ring for adjusting plate; 10. Adjusting plate. Detailed Implementation

[0022] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] See also Figures 1 to 3 As shown, the present invention provides a damping device, including a body 14 and a piston. The piston includes a first piston 21 and a second piston 22. The first piston 21 extends into the body 14 from a first end, and the second piston 22 extends into the body 14 from a second end. A closed damping cavity 11 is formed between the first piston 21 and the second piston 22 within the body 14.

[0024] In the above technical solution, the first piston 21 and the second piston 22 are used to transmit the impact force generated by the external spacer structure during its movement to the closed damping cavity 11 formed between the first piston 21 and the second piston 22. The body 14 serves as the structural frame of the damping device, accommodating and supporting components such as the piston and guiding the reciprocating motion of the piston. Together with the first piston 21 and the second piston 22, it forms the closed damping cavity 11, allowing it to accommodate buffer fluids such as oil, water, or high-pressure gas, preventing leakage. The piston responds to the inward compression and outward tension stress of the conductor. When the conductor moves, the first piston 21 or the second piston 22 transmits the inward pressure to the damping cavity 11. The fluid or gas within the damping cavity 11 is compressed under pressure, generating a reverse fluid pressure on the piston, thereby buffering the inward pressure generated by the conductor's movement. Similarly, when the piston is pulled outward under external force, the fluid or gas within the damping cavity 11 generates a force opposite to the pulling force to resist the piston's outward movement, thus buffering the tensile force. This bidirectional damping design can effectively meet the buffering requirements of composite phase spacers under extreme galloping conditions, providing more comprehensive stress buffering.

[0025] This invention utilizes a closed damping cavity 11 formed by the cooperation of a first piston 21 and a second piston 22 to dampen and buffer the galloping of the phase spacer bars. Compared to conventional damping devices that mainly rely on springs, fluid damping is more stable and less prone to failure due to fatigue, maintaining an effective damping effect for a longer period and extending the service life of the damping device. This damping device effectively buffers the stress caused by conductor galloping, helping to reduce the risk of damage to the phase spacer bars, reducing line faults caused by galloping, improving the safety and reliability of transmission lines, and lowering maintenance costs.

[0026] In one embodiment of the present invention, both the first piston 21 and the second piston 22 include a piston rod 31 and a piston head 32. The piston rod 31 is inserted into the body 14 along the axial direction and connected to the piston head 32. A connecting fitting is provided at the end of the piston rod 31 away from the piston head 32.

[0027] In the above technical solution, the piston rod 31 is a key component of the piston structure. It not only connects the body 14 and the piston head 32, but also serves as a stress transmission channel. When the conductor vibrates and generates stress, the piston rod 31 can quickly transfer the stress from the connecting hardware 34 to the piston head 32, driving the piston to move axially within the damping cavity 11, generating a damping effect. The piston head 32 is located on both sides of the damping cavity 11, and together with the body 14, forms a closed damping cavity 11. The piston head 32 is in direct contact with the buffer fluid within the damping cavity 11. When the piston head 32 receives an external force and moves along the body 14 within the body 14, it compresses or stretches the volume of the damping cavity 11. The buffer fluid within the damping cavity 11, as the volume of the damping cavity 11 changes, generates a reverse force on the piston head 32, thereby buffering the external force on the piston head 32 and achieving the damping function. The connecting fitting 34 is located at the end of the piston rod 31 away from the piston head 32. It is mainly used to connect the damping device to the wire or other fixed point to ensure that the force of the external structure can be smoothly transmitted to the piston head 32 and the damping cavity 11 in the damping device.

[0028] In one embodiment of the present invention, an end plate 12 is provided at the end of the body 14, and a piston rod 31 passes through the end plate 12. A limiting cavity 13 is formed between the end plate 12 and the piston head 32. An elastic member 4 is provided in the limiting cavity 13. The elastic member 4 is sleeved on the piston rod 31, and the two ends of the elastic member 4 abut against the end plate 12 and the piston head 32 respectively.

[0029] In the above technical solution, the end plate 12 not only provides a fixed insertion point for the piston rod 31, supporting and guiding its telescopic movement, but also forms a limiting cavity 13 together with the piston head 32, restricting the movement range of the piston head 32 and preventing excessive displacement from causing structural damage. A specially designed elastic element 4, such as an elastomer or spring, is fitted onto the portion of the piston rod 31 located within the limiting cavity 13. The limiting cavity 13 limits the elastic element 4, which, through its two ends contacting the end plate 12 and the piston head 32 respectively, provides an immediate elastic damping response when the piston rod 31 moves, helping to absorb and buffer the stress caused by conductor galloping, ensuring the stability and reliability of the damping device. The damping device proposed in this solution, based primarily on the damping cavity for buffering and vibration reduction, adds an elastic element fitted onto the piston rod 31. Compared with traditional damping structures that rely solely on springs for buffering, it has a better buffering effect while significantly reducing the burden on the elastic element, resulting in a longer service life and reducing the risk of fatigue failure. In addition, the elastic element buffer and the buffer fluid buffer in the damping cavity form a double insurance. Even if the damping device structure is deformed or damaged, causing the buffer fluid pressure in the damping cavity to decrease, the elastic element can still ensure that the damping device has a buffering and vibration reduction effect, thus improving the reliability of the damping device.

[0030] In one embodiment of this invention, the damping cavity 11 is filled with a buffer fluid, which may include gas, water, or oil.

[0031] In the aforementioned technical solution, the composite phase spacer bars in overhead transmission lines face stresses including both inward compression and outward tension. This necessitates a bidirectional damping device capable of withstanding both compressive and tensile forces. The damping cavity 11, filled with a buffer fluid such as gas, water, or oil, fulfills this bidirectional damping requirement. Furthermore, buffer fluids like gas, water, or oil possess better compressibility and rheological properties than springs, providing a smoother buffer for the piston. They also maintain stable and consistent damping effects over a wider temperature and pressure range, reducing the impact of external environmental changes on the damping device's performance. More importantly, buffer fluids like gas, water, or oil do not fail due to fatigue like springs. Therefore, damping devices filled with buffer fluid have a longer service life, maintain stable damping effects for longer periods, and reduce maintenance frequency and costs.

[0032] According to another aspect of the present invention, a composite phase-to-phase spacer is also provided. The composite phase-to-phase spacer further includes a plurality of phase-to-phase insulators 5. The composite phase-to-phase spacer includes the aforementioned damping device 1. The damping device 1 is disposed between two adjacent phase-to-phase insulators 5. The damping device 1 can buffer the interaction force between two adjacent phase-to-phase insulators 5.

[0033] In the above technical solution, in high-voltage transmission lines, phase-to-phase insulators 5 are used to support and isolate live conductors, preventing short circuits and arcing. When conductors gallop, phase-to-phase insulators 5 are subjected to significant tensile and compressive stresses, which can easily lead to insulator damage or fatigue. By installing damping devices 1 between adjacent phase-to-phase insulators 5, the interaction forces between them can be effectively buffered, stress concentration can be reduced, and the service life of the insulators can be extended. The damping device 1 plays a buffering and damping role between two adjacent phase-to-phase insulators 5, absorbing the energy caused by conductor galloping and reducing the direct impact of mechanical stress on the insulators. Specifically, when phase-to-phase galloping occurs, the two phase conductors generate inward compressive stress. The piston rod drives the piston to move from both sides into the damping cavity and squeeze the buffer fluid such as high-pressure air in the damping cavity. The high-pressure air generates a reverse thrust, preventing the piston from moving inward. When the two phase conductors generate outward tensile stress, the spring in the limiting cavity is compressed and deformed, generating an inward thrust, preventing the piston from moving outward. The damping device 1 effectively buffers bidirectional stress and reduces stress damage to the insulator through the movement of the first piston 21 and the second piston 22, as well as the interaction between the elastic element 4 and the buffer fluid.

[0034] Compared to conventional damping devices that mainly rely on springs, damping devices using buffer fluid are more stable, do not suffer from fatigue failure, and can maintain effective damping for a longer period of time, thus extending the service life of the damping device. This achieves effective protection for phase-to-phase insulators and improves the anti-galling capability and stability of composite phase-to-phase spacers and the entire transmission line.

[0035] In one embodiment of this utility model, a monitoring unit 6 is provided on the phase-to-phase insulator 5, and the monitoring unit 6 can monitor the status of the phase-to-phase insulator 5.

[0036] In the aforementioned technical solution, in high-voltage transmission lines, the phase-to-phase insulators 5 are subjected to various stresses and environmental factors over a long period, making them prone to aging, cracking, or deterioration in electrical performance. By integrating a monitoring unit 6 onto the insulator, real-time operational data can be collected, allowing for the timely detection of these early faults and preventing them from escalating into more serious accidents. The monitoring unit 6 may include a stress sensor to measure the stress distribution of the composite phase-to-phase insulator 5 under different environmental conditions and loads. By analyzing this data, the structural strength and fatigue resistance of the insulator can be assessed, and timely measures can be taken to prevent damage caused by stress overload. The monitoring unit 6 may also include a temperature sensor to monitor temperature changes during operation, especially the temperature related to the interface between the core rod and the silicone rubber layer. This helps to provide early warning of overheating risks caused by internal defects or changes in the external environment, preventing the insulator from aging or being damaged more quickly due to overheating. By collecting the aforementioned various status information, the monitoring unit 6 can perform comprehensive analysis to assess the overall operational status of the phase-to-phase insulator 5. Combined with intelligent analysis algorithms, the remaining service life of the insulator can be predicted, enabling condition-based intelligent operation and maintenance, thereby improving the operational safety and economy of the transmission line.

[0037] In one embodiment of the present invention, the phase-to-phase insulator 5 includes a core rod 51, and the monitoring unit 6 includes a sensing optical fiber, which is wound around the core rod 51.

[0038] In the above technical solution, the core rod 51 is the key component of the interphase insulator that bears the stress. Due to long-term buckling fatigue, interphase composite insulators develop microcracks. The sensing fiber can accurately measure the stress distribution on the core rod 51, including tensile and compressive stresses. By monitoring the stress distribution of the core rod 51, microcracks can be detected and warned of insulator defects in a timely manner. The sensing fiber can also monitor the temperature changes of the core rod 51, thereby providing early warning of thermal damage risks and preventing the insulator from aging prematurely or failing due to overheating. The sensing fiber has high-precision measurement capabilities, capable of capturing minute stress changes and temperature fluctuations. Compared to other sensors, fiber optic sensors are less susceptible to electromagnetic interference, have high stability, and maintain reliable monitoring performance even under high voltage and harsh weather conditions.

[0039] In one embodiment of the present invention, the phase-to-phase insulator 5 further includes a sheath layer 52 sleeved on the core rod 51, and a sensing optical fiber is wound between the sheath layer 52 and the core rod 51.

[0040] In the above technical solution, the sheath layer 52, as the outer protective layer, provides a relatively closed and stable physical environment for the optical fiber and core rod 51, effectively protecting them from external mechanical damage and environmental factors such as ultraviolet radiation and rain erosion, ensuring their long-term stable operation. The sensing optical fiber can be wound between the sheath layer 52 and the core rod 51, or it can be wrapped inside the sheath layer. Specifically, a sheath layer 52 of not less than 2mm thickness is first extruded onto the core rod, and then one or more sensing optical fibers are wound onto the sheath layer 52 according to the designed pitch. Then, silicone rubber outer insulating skirts and sheaths are injected using an injection molding process, thereby wrapping the sensing optical fiber inside the sheath layer. By embedding different sensing optical fibers inside the sheath layer 52, the stress state of the phase-to-phase composite insulator core rod, the temperature rise at the interface between the phase-to-phase composite insulator core rod and the silicone rubber layer, and the leakage current of the phase-to-phase composite insulator can be monitored online, and the online operation of the phase-to-phase spacer can be monitored in real time.

[0041] In one embodiment of this utility model, the end of the phase insulator 5 is provided with an end fitting 53. When the piston is provided with a connecting fitting 34, the end fitting 53 is connected to the connecting fitting 34.

[0042] In the above technical solution, the end fittings of each phase-to-phase insulator or damping device adopt a ring design and are connected by U-shaped ring fittings to prevent the core rod from being damaged due to bending stress. This ensures rotational freedom. The robust connection between the end fittings 53 and the connecting fittings 34 significantly enhances the connection strength of the phase-to-phase insulator 5 in the transmission line, ensuring the stability and safety of the phase-to-phase insulator 5 under complex environments and stress conditions. The electrical isolation design between the end fittings 53 and the connecting fittings 34 ensures the electrical performance of the phase-to-phase insulator 5, preventing risks such as electrical short circuits or flashovers, and guaranteeing the safe operation of the transmission line. The stable connection between the end fittings 53 and the connecting fittings 34, combined with the anti-galloping design of the overall composite phase-to-phase spacer, improves the wind resistance and anti-galloping capability of the entire system, reduces line faults caused by conductor galloping, and improves the reliability of power transmission.

[0043] In one embodiment of this utility model, the composite phase-to-phase spacer also includes an equipotential line 7, which is disposed between the phase-to-phase insulator 5 and the damping device 1.

[0044] In the above technical solution, in a high-voltage transmission environment, even a tiny potential difference can lead to serious electrical faults, including arcing, equipment damage, and even fire. The equipotential bonding line 7 ensures electrical continuity between the phase-to-phase insulator 5 and the damping device 1, guaranteeing that their potentials are consistent and preventing loosening of the connecting hardware due to vibrations during operation, which could cause potential differences and lead to discharge and erosion. By connecting the equipotential bonding line 7, the phase-to-phase insulator 5 and the damping device 1 form an electrically continuous system, which contributes to the electrical stability of the entire composite phase-to-phase spacer.

[0045] In one embodiment of this utility model, the end of the phase-to-phase insulator 5 away from the damping device is connected to a sub-conductor spacer 8.

[0046] In the aforementioned technical solution, the distance between conductors on high-voltage overhead transmission lines needs to be strictly controlled to avoid phase-to-phase flashover and other electrical faults. The sub-conductor spacer 8, with its adjustable length and angle, ensures a safe and effective spacing between conductors. This not only contributes to electrical safety but also optimizes the power transmission efficiency of the line, preventing arcing and phase-to-phase short circuits. Furthermore, the design of the sub-conductor spacer 8 reduces conductor galloping amplitude, absorbing and dispersing some of the energy generated by conductor galloping through its rigid structure, thereby mitigating the mechanical impact on the phase-to-phase insulator 5 and extending the insulator's service life.

[0047] In one embodiment of this utility model, an equalizing ring 91 for phase-to-phase insulators is also provided at the end of the phase-to-phase insulator 5.

[0048] In the above technical solution, high-voltage transmission lines generate strong electric fields during operation, especially in the area between the conductors and phase-to-phase insulators. Adding an equipotential bonding ring 91 to the insulator ends can effectively improve the electric field distribution in this area, making it more uniform and reducing the risks associated with corona discharge and excessively high local electric field strength. Corona discharge leads to energy loss, radio interference, and environmental pollution. The equipotential bonding ring 91 reduces the electric field gradient at the ends of the phase-to-phase insulators, reducing corona discharge and thus reducing radio interference, improving the efficiency and quality of power transmission.

[0049] In one embodiment of this utility model, an adjustment plate 10 is further provided between the phase-to-phase insulator equalizing ring 91 and the sub-conductor spacer 8, and an equalizing ring 92 for the adjustment plate is installed on the adjustment plate 10.

[0050] In the above technical solution, the adjustment plate 10 provides an adjustable platform that can finely adjust the distance between the sub-conductor spacer 8 and the conductor according to the line design or actual needs, thereby optimizing the electrical isolation between conductors and reducing the possibility of electrical faults. The equalizing ring 92 on the adjustment plate 10 can homogenize the electric field around the conductor through its shape and position adjustment capability, reducing corona discharge and electromagnetic interference, and improving the efficiency and quality of power transmission.

[0051] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: The first piston 21 and the second piston 22 are used to transmit the impact force generated by the external spacer structure during its movement to the closed damping cavity 11 formed between the first piston 21 and the second piston 22. The body 14 serves as the structural frame of the damping device, used to accommodate and support components such as pistons and guide the reciprocating motion of the pistons. Together with the first piston 21 and the second piston 22, it forms a closed damping cavity 11, allowing the damping cavity to accommodate buffer fluids such as oil, water, or high-pressure gas, preventing leakage of the buffer fluid. The piston can respond to the inward compression and outward tension stress of the wire. When the wire moves, the first piston 21 or the second piston 22 transmits the inward pressure to the damping cavity 11. The fluid or gas in the damping cavity 11 is compressed under force, generating a reverse fluid pressure on the piston, thereby buffering the inward pressure generated by the wire's movement. Similarly, when the piston is pulled outward under external force, the fluid or gas in the damping chamber 11 generates a force opposite to the pulling force to resist the outward movement of the piston, thereby buffering the tensile force. This bidirectional damping design can effectively meet the buffering requirements of composite phase spacers under extreme galloping conditions, providing more comprehensive stress buffering. The first piston 21 and the second piston 22 cooperate to form a closed damping chamber 11 to dampen the galloping of the phase spacers. Compared to conventional damping devices that mainly rely on springs, fluid damping is more stable than spring damping, less prone to fatigue failure, and can maintain an effective damping effect for a longer period, extending the service life of the damping device. This damping device can effectively buffer the stress caused by conductor galloping, helping to reduce the risk of damage to the phase spacers, reducing line faults caused by galloping, improving the safety and reliability of transmission lines, and reducing maintenance costs.

[0052] This invention redesigns the overall structure of the composite phase-to-phase spacer, adopting a multi-segment structure. At least one segment features a damped design with a damping device, and the multi-segment composite insulator is connected in a ring-to-ring configuration, thus solving the problem of easy breakage during galloping. The composite insulator also incorporates a built-in stress sensor to monitor its operating status, promptly detect defects, and prevent accidents.

[0053] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A damping device, characterized in that, The device includes a body (14) and a piston, the piston including a first piston (21) and a second piston (22), the first piston (21) extending into the body (14) from a first end, and the second piston (22) extending into the body (14) from a second end, and a closed damping cavity (11) is formed between the first piston (21) and the second piston (22) within the body (14).

2. The damping device according to claim 1, characterized in that, Both the first piston (21) and the second piston (22) include a piston rod (31) and a piston head (32). The piston rod (31) is inserted into the body (14) axially and connected to the piston head (32). A connecting fitting (34) is provided at the end of the piston rod (31) away from the piston head (32).

3. The damping device according to claim 2, characterized in that, The end of the body (14) is provided with an end plate (12), the piston rod (31) passes through the end plate (12), a limiting cavity (13) is formed between the end plate (12) and the piston head (32), an elastic element (4) is provided in the limiting cavity (13), the elastic element (4) is sleeved on the piston rod (31), and the two ends of the elastic element (4) abut against the end plate (12) and the piston head (32) respectively.

4. The damping device according to claim 1, characterized in that, The damping cavity (11) is filled with a buffer fluid, which may include gas, water or oil.

5. A composite interphase spacer bar, characterized in that, The composite phase spacer also includes a plurality of phase insulators (5), and the composite phase spacer includes a damping device (1) as described in any one of claims 1 to 4. The damping device (1) is disposed between two adjacent phase insulators (5), and the damping device (1) can buffer the interaction force between two adjacent phase insulators (5).

6. The composite interphase spacer according to claim 5, characterized in that, The phase-to-phase insulator (5) is provided with a monitoring unit (6), which can monitor the status of the phase-to-phase insulator (5).

7. The composite interphase spacer according to claim 6, characterized in that, The phase-to-phase insulator (5) includes a core rod (51), and the monitoring unit (6) includes a sensing optical fiber, which is wound around the core rod (51).

8. The composite interphase spacer according to claim 7, characterized in that, The phase-to-phase insulator (5) also includes a sheath layer (52) sleeved on the core rod (51), and the sensing optical fiber is wound between the sheath layer (52) and the core rod (51).

9. The composite interphase spacer according to claim 6, characterized in that, The phase insulator (5) is provided with an end fitting (53) at its end. When the piston is provided with a connecting fitting (34), the end fitting (53) is connected to the connecting fitting (34).

10. The composite interphase spacer according to claim 6, characterized in that, The composite phase-to-phase spacer also includes an equipotential line (7), which is disposed between the phase-to-phase insulator (5) and the damping device (1).

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