A seismic-resistant connection fitting and method for a converter valve

Abstract

A seismic-resistant connection fitting and method for a converter valve is disclosed. The fitting comprises: a tube mother and a valve tower connection terminal positioned opposite each other; a retractable connecting rod respectively connecting the tube mother and the valve tower connection terminal; a limit clamp fixedly attached to the interior of a support sleeve; four sets of guide and centering mechanisms evenly distributed within the support sleeve; a guide circular plate disposed to the left of the limit clamp, with a rotatable joint rotatably disposed within it; a damping spring with its left end connected to the valve tower connection terminal and its right end connected to the rotatable joint; a sliding connecting rod with its left end passing through the limit clamp and fixedly attached to the guide circular plate; and multiple split flexible wires evenly distributed circumferentially around the retractable connecting rod, with their ends respectively connected to the valve tower connection terminal and the tube mother connection terminal. The method involves connecting the fitting between the converter valve and electrical equipment. During an earthquake, the fitting absorbs the impact force, providing a decoupling effect. This fitting and method can achieve seismic decoupling between the converter valve and electrical equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of earthquake-resistant equipment in a converter station valve hall, and in particular relates to an earthquake-resistant connection fitting and method for a converter valve. Background Art

[0002] The valve hall of a converter station is one of the most crucial components of a DC transmission project. The converter valve is the core equipment in the valve hall and is highly vulnerable to earthquakes. Furthermore, the converter valve is interconnected with other electrical equipment, posing obvious hidden dangers to its seismic safety. Once damaged, it will seriously affect the safe and stable operation of the power grid and may even cause huge economic losses.

[0003] Because vibration isolation measures are low-cost and highly reliable, they can effectively improve the reliability of power grid systems during earthquakes. Currently, most electrical equipment uses vibration isolation measures to significantly reduce the impact of earthquakes on electrical equipment and effectively protect expensive electrical equipment. Conventional converter valves in converter stations are often installed in a suspended manner. This allows them to swing slightly during earthquakes, providing some shock absorption. However, this can interact with connected electrical equipment, potentially damaging the valves.

[0004] At present, the electrical equipment in the valve hall is usually connected by soft wires or busbars plus connecting hardware. The connection terminals of conventional valve towers are generally connected to the busbars in the horizontal direction. The sliding end hardware of the busbars will be set with a very small sliding amount to ensure that it can be adjusted during installation or have a buffer margin in the face of slight vibrations.

[0005] Since the valve tower equipment is installed in a suspended manner, it will have a large displacement in the event of an earthquake. The sliding amount of the connecting hardware cannot meet the vibration displacement during an earthquake, and its shock absorption capacity is quite limited. Moreover, the sliding part inside the hardware is not equipped with a damping device with buffering capacity. During a major earthquake, the equipment may be destroyed in an instant.

[0006] Therefore, it is urgent to provide a converter valve seismic connection fitting and method that has an ideal shock absorption effect and can effectively protect electrical equipment. Summary of the Invention

[0007] In response to the problems existing in the above-mentioned prior art, the present invention provides a seismic-resistant connection hardware and method for a converter valve. The connection hardware has a simple structure, low manufacturing cost, and a convenient assembly process. At the same time, its performance is stable and not easy to damage. It has a large range of sliding and good seismic energy absorption effect, which can effectively realize the decoupling of the valve tower and other electrical equipment under the action of an earthquake, and can effectively reduce the disturbance effect between adjacent equipment without affecting the electrical performance. The method realizes the decoupling between the converter valve and the electrical equipment under the action of an earthquake by connecting the seismic-resistant connection hardware of the converter valve between the converter valve and the electrical equipment, which can effectively reduce the mutual disturbance effect between the converter valve and the electrical equipment, and can ensure the reliable transmission of electrical energy between the converter valve and the electrical equipment.

[0008] In order to achieve the above-mentioned object, the present invention provides a converter valve seismic connection hardware, wherein the converter valve seismic connection hardware comprises a valve tower connection terminal, a pipe mother connection terminal, a retractable connecting rod and a split flexible wire;

[0009] The pipe female connection terminal and the valve tower connection terminal are relatively distributed on the left and right sides;

[0010] The telescopic connecting rod includes a supporting sleeve, a limiting clamping plate, a guide centering mechanism, a guide circular plate, a rotatable joint, a damping spring and a sliding connecting rod;

[0011] The left end of the support sleeve is coaxially fixedly connected to the center of the right end of the valve tower connection terminal;

[0012] The outer diameter of the limit clamping plate is adapted to the inner diameter of the support sleeve, and is coaxially fixedly connected to the inside of the right section of the support sleeve;

[0013] Four sets of guide and centering mechanisms are evenly distributed circumferentially inside the support sleeve, and each set of guide and centering mechanisms includes a plurality of ball grooves and a plurality of sliding balls; the ball grooves are spherical crown-shaped, and the plurality of ball grooves are sequentially opened on the inner wall of the support sleeve along the length direction, with the left ends of the ball grooves starting from the right end of the limit clamping plate and the right ends ending at the right end of the support sleeve; the plurality of sliding balls are rotatably assembled in the plurality of ball grooves in a one-to-one correspondence;

[0014] The guide circular plate is located on the left side of the limiting clamping plate, and its outer diameter is adapted to the inner diameter of the support sleeve, and is axially slidably assembled inside the support sleeve; a cylindrical accommodating cavity is coaxially opened inside the guide circular plate, and a through hole is opened at the axis center of its left end to connect the cylindrical accommodating cavity and the left exterior;

[0015] The size of the rotatable joint is adapted to the size of the cylindrical accommodating cavity, and the rotatable joint is rotatably assembled inside the cylindrical accommodating cavity;

[0016] The left end of the damping spring is connected to the axis of the right end of the valve tower connection terminal, and the right end thereof extends into the interior of the cylindrical accommodation cavity through the through hole and is connected to the center of the left end of the guide circular plate;

[0017] The outer diameter of the sliding connecting rod is adapted to the inner diameter of the limit clamping plate, and its right end is coaxially fixedly connected to the axis center inside the left end of the female pipe connection terminal; the left section of the sliding connecting rod is coaxially slidably inserted into the interior of the supporting sleeve and simultaneously engages with a plurality of sliding balls in the four sets of guide centering mechanisms. At the same time, the left end of the sliding connecting rod can slide through the limit clamping plate and is coaxially fixedly connected to the right end of the guide circular plate;

[0018] Multiple split soft wires are evenly distributed in a circumferential direction on the periphery of the telescopic connecting rod, and their central area is radially outwardly bulging, and their two end areas are tapered. At the same time, their left ends are evenly fixedly connected in a circumferential direction to the inside of the right end of the valve tower connecting terminal, and their right ends are evenly fixedly connected in a circumferential direction to the inside of the left end of the pipe mother connecting terminal.

[0019] Furthermore, in order to facilitate the reliable connection between the pipeline connection terminal and the pipe mother, the pipe mother connection terminal is an annular structure, and a plurality of threaded holes connecting its inner cavity and the outside are opened in the radial direction of its segment; in order to facilitate the reliable electrical connection between the valve tower connection terminal and the converter valve, a wire clamp is coaxially fixedly connected to the axis of the left end of the valve tower connection terminal, and a threaded hole 2 is opened on the wire clamp.

[0020] Furthermore, in order to ensure that the limiting clamping plate has good bearing strength and at the same time, to ensure its service life, the limiting clamping plate is made of steel plate.

[0021] Furthermore, in order to ensure that the length of several ball grooves in the same set of guide and centering mechanisms is not less than one-third of the length of the support sleeve, the length of the force-bearing contact surface between the support sleeve and the sliding rod can be not less than one-third, and the situation of breakage due to too short a contact surface length will not occur.

[0022] Furthermore, in order to ensure that the sliding link has good load-bearing capacity and to effectively reduce the friction resistance during rolling contact with the sliding ball, the sliding link is made of steel and is a solid rod with a smooth outer surface.

[0023] Furthermore, in order to reduce the frictional resistance during the rotation of the rotatable joint and to improve the follow-up capability of the rotatable joint, the inner surface of the cylindrical accommodating cavity and the outer surface of the rotatable joint are both smooth structures.

[0024] Furthermore, in order to ensure the stability of the spring performance and good mechanical properties, and at the same time, to avoid the problem of heat generation and to fully ensure a good energy absorption effect, the damping spring is made of non-magnetic material.

[0025] Furthermore, in order to improve the load-bearing capacity of the sliding ball and at the same time, to effectively extend its service life, the sliding ball is made of steel material and is a solid sphere with a smooth outer surface; in order to enable the sliding ball to stably and reliably contact and cooperate with the sliding rod after assembly, the diameter of the sliding ball is slightly larger than the wall thickness of the support sleeve, and it is assembled on the outside of the corresponding ball groove.

[0026] As a preference, the area between the support sleeves is filled with insulator 1, and the area between the right end of the sliding connecting rod and the female pipe connecting terminal is filled with insulator 2.

[0027] In the present invention, a limit clamp is installed inside the support sleeve, and a guide circular plate is provided on the left side of the limit clamp. The left end of the sliding rod slides through the limit clamp and is fixedly connected to the guide circular plate. In this way, the maximum rightward sliding stroke of the sliding connecting rod relative to the support sleeve can be limited by the limit fit between the guide circular plate and the limit clamp. Four sets of guide positioning mechanisms are evenly arranged circumferentially in the portion to the right of the limit clamp, and the ball grooves in each set of guide positioning mechanisms are provided on the inner wall of the support sleeve along the length direction. Sliding balls are then installed in the ball grooves. In this way, the sliding balls in the four sets of guide positioning mechanisms can all roll in contact with the sliding rod body. This not only plays a guiding and centering role, but also can convert the radial force into axial force through the rolling contact between the sliding balls and the sliding rod body when the sliding rod is subjected to radial force, thereby avoiding the situation where the telescopic connecting rod breaks due to the radial force during vibration, and ensuring the reliability of the overall performance of the connecting hardware. A damping spring is provided in the support sleeve, and the two ends of the damping spring are respectively connected to the valve tower connection terminal and the guide circular plate. In this way, when the sliding link moves toward or away from the valve tower connection terminal, the damping spring can be used to provide elastic force or tension, thereby effectively buffering the impact force. At the same time, it is also beneficial to extend the sliding time of the sliding link within the sliding range. A cylindrical accommodating cavity is opened in the inner center of the guide circular plate, and the cylindrical accommodating cavity is connected to the outer side of the guide circular plate through a through hole. A rotatable joint is then rotatably assembled in the cylindrical accommodating cavity. The right end of the damping spring is then extended into the cylindrical accommodating cavity through the through hole and connected to the rotatable joint. In this way, when the sliding rod and the guide circular plate rotate radially relative to the support sleeve, the rotatable joint rotates relative to the guide circular plate to achieve a detwisting effect, thereby maintaining the synchronization state of the rotatable joint and the damping spring, avoiding radial torsion of the damping spring, and further improving the reliability and service life of the damping spring. A plurality of split flexible conductors are arranged on the periphery of the sliding connecting rod, and at the same time, the central area thereof is in a radially outward bulging state, and then the two ends are contracted and respectively connected to the valve tower connection terminal and the pipe mother connection terminal. In this way, a plurality of split flexible conductors can be used to realize reliable transmission of electrical energy between the two terminals. Since the split flexible conductors have good flexibility, they can adaptively adjust the extension state according to the extension degree of the telescopic connecting rod. In this way, they will not interfere with the normal sliding movement between the sliding rod and the support sleeve, thereby ensuring the stability and reliability of the sliding energy absorption effect. In addition, since the damping spring provided has the effect of extending the sliding time of the sliding rod, it can ensure that the plurality of split flexible conductors can have a longer time margin for adaptive shape changes, further ensuring the reliable transmission of electrical energy between the converter valve and the electrical equipment during an earthquake.

[0028] The connecting hardware has a simple structure, low manufacturing cost and convenient assembly process. At the same time, it has stable performance and is not easy to damage. It has a large range of sliding and good seismic energy absorption effect. It can effectively realize the decoupling of the valve tower and other electrical equipment under the action of earthquake, effectively reducing the disturbance effect between adjacent equipment without affecting the electrical performance.

[0029] The present invention provides a method for seismic-resistant connection of a converter valve, which uses a converter valve seismic-resistant connection hardware, including the following steps:

[0030] Step 1: Calculate the maximum displacement based on the allowable force on the converter valve terminals and the earthquake intensity simulation, and then determine the sliding range and damping coefficient of the damping spring. Based on these parameters, determine the size and model of the converter valve seismic connector.

[0031] Step 2: Prepare and assemble the converter valve anti-seismic connection hardware according to the determined size and model, ensuring that under normal conditions, the left end of the sliding link is located at a set distance to the left of the limit clamp under the action of the damping spring. At the same time, ensure that the center area of ​​the multiple split flexible wires is radially outwardly bulging, so that the sliding link has both compression and tension buffer margins relative to the support sleeve;

[0032] Step 3: Connect the wire clamp on the left end of the valve tower connection terminal to the wire on the converter valve. Secure the wire clamp to the wire using the second connecting bolt inserted through the second threaded hole, thereby achieving electrical connection between the converter valve's seismic connection fitting and the converter valve.

[0033] The pipe mother connection terminal is placed on the outside of the pipe mother connected to the electrical equipment, and the pipe mother connection terminal is fixedly connected to the pipe mother by a connecting bolt inserted into the threaded hole 1, thereby achieving electrical connection between the converter valve anti-seismic connection hardware and the electrical equipment side;

[0034] Step 4: During an earthquake, when the electrical equipment shakes, the electrical equipment pushes the pipe nut connection terminal through the pipe nut, driving the sliding connecting rod to move toward the valve tower connection terminal, or away from the valve tower connection terminal;

[0035] When the mother tube connection terminal moves toward the valve tower connection terminal, the elastic force provided by the damping spring to the sliding connecting rod offsets the axial impact force and prolongs the time for the mother tube connection terminal and the valve tower connection terminal to approach each other. When the mother tube connection terminal moves away from the valve tower connection terminal, the tension provided by the damping spring to the sliding connecting rod offsets the axial tension and prolongs the time for the mother tube connection terminal and the valve tower connection terminal to move away from each other. Thus, while reducing the impact of the electrical equipment on the converter valve, the multiple split flexible wires have more time margin to adaptively adjust their shape following the change in the distance between the mother tube connection terminal and the valve tower connection terminal, thereby protecting the converter valve and the multiple split flexible wires.

[0036] At the same time, when the damping spring acts on the sliding link, several sliding balls in the four sets of guide and centering mechanisms act radially on the sliding link, and the radial force generated by the sliding link is converted into axial force through the rolling contact process, thereby avoiding the breakage of the telescopic link.

[0037] This method achieves decoupling between the converter valve and the electrical equipment under earthquake action by connecting the converter valve anti-seismic connecting hardware between the converter valve and the electrical equipment, effectively reducing the mutual disturbance influence between the converter valve and the electrical equipment. At the same time, when an earthquake occurs, the damping spring can be used to provide a buffering and energy absorption effect, which plays a good anti-seismic role. In addition, through the setting of the sliding ball, the radial force generated by the sliding rod during the earthquake can be converted into an axial force, thereby avoiding the breakage of the telescopic connection, further ensuring the reliable connection between the converter valve and the electrical equipment, and ensuring the stable transmission of electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the present invention;

[0039] Figure 2 It is a structural schematic diagram of the telescopic connecting rod in the present invention;

[0040] Figure 3 This is a schematic diagram of the assembly of the telescopic connecting rod of the present invention after removing the sliding connecting rod;

[0041] Figure 4 This is a schematic diagram of the assembly of the guide circular plate and the rotatable joint in the present invention;

[0042] Figure 5 It is a schematic diagram of the application of the anti-seismic connection hardware of the converter valve in the present invention.

[0043] In the figure: 1. Converter valve; 2. Mother tube; 3. Seismic connection fittings of converter valve, 31. Valve tower connection terminal, 32. Retractable connecting rod, 321. Support sleeve, 322. Sliding connecting rod, 323. Damping spring, 324. Sliding ball, 325. Limiting clamp, 326. Rotatable joint, 327. Ball groove, 328. Guide circular plate, 329. Through hole, 33. Mother tube connection terminal, 34. Split flexible wire; 35. Wire clamp; 4. Electrical equipment. DETAILED DESCRIPTION

[0044] The present invention will be further described below with reference to the accompanying drawings.

[0045] like Figures 1 to 5 As shown, the present invention provides a converter valve seismic connection fitting, wherein the converter valve seismic connection fitting 3 includes a valve tower connection terminal 31, a pipe mother connection terminal 33, a telescopic connecting rod 32 and a split soft wire 34;

[0046] The female pipe connection terminal 33 and the valve tower connection terminal 31 are distributed opposite to each other on the left and right sides;

[0047] The telescopic connecting rod 32 includes a supporting sleeve 321, a limiting clamping plate 325, a guide centering mechanism, a guide circular plate 328, a rotatable joint 326, a damping spring 323 and a sliding connecting rod 322;

[0048] The left end of the support sleeve 321 is coaxially fixedly connected to the center of the right end of the valve tower connection terminal 31;

[0049] The outer diameter of the limit clamping plate 325 matches the inner diameter of the support sleeve 321 and is coaxially fixedly connected to the inner portion of the right section of the support sleeve 321;

[0050] Four sets of guide and centering mechanisms are evenly distributed circumferentially within the support sleeve 321, and each set of guide and centering mechanisms includes a plurality of ball grooves 327 and a plurality of sliding balls 324. The ball grooves 327 are spherical and crown-shaped. The plurality of ball grooves 327 are sequentially formed along the length direction on the inner wall of the support sleeve 321, with the left ends of the ball grooves starting from the right end of the limit clamp 325 and the right ends ending at the right end of the support sleeve 321. The plurality of sliding balls 324 are rotatably assembled in the plurality of ball grooves 327 in a one-to-one correspondence.

[0051] The guide circular plate 328 is located on the left side of the limiting clamping plate 325. Its outer diameter matches the inner diameter of the support sleeve 321 and is axially slidably assembled inside the support sleeve 321. A cylindrical accommodating cavity is coaxially defined inside the guide circular plate 328, and a through hole 329 is defined at the axis center of its left end, connecting the cylindrical accommodating cavity with the left exterior.

[0052] The rotatable joint 326 is in the shape of a circular plate, the size of which matches the size of the cylindrical accommodation cavity, and is rotatably assembled inside the cylindrical accommodation cavity;

[0053] The left end of the damping spring 323 is connected to the axis of the right end of the valve tower connection terminal 31, and the right end thereof extends into the interior of the cylindrical accommodation cavity through the through hole 329 and is connected to the left end center of the guide circular plate 328;

[0054] The outer diameter of the sliding link 322 is adapted to the inner diameter of the limiting clamping plate 325, and its right end is coaxially fixedly connected to the axis center inside the left end of the female pipe connection terminal 33; the left section of the sliding link 322 is coaxially slidably inserted into the interior of the support sleeve 321, and simultaneously engages with a plurality of sliding balls 324 in the four sets of guide centering mechanisms. At the same time, the left end of the sliding link 322 can slide through the limiting clamping plate 325 and is coaxially fixedly connected to the right end of the guide circular plate 328.

[0055] The sliding range of the sliding link 322 relative to the support sleeve 321 is the distance from the limit card plate 325 to the left end of the support sleeve 321. Specifically, the entire sliding length can be comprehensively controlled by the length of the support sleeve 321, the installation position of the limit card plate 325, and the length of the sliding link 322. Furthermore, in actual application, it can be accurately determined by calculation based on the earthquake intensity requirements and electrical equipment parameters.

[0056] Multiple split flexible wires 34 are evenly distributed around the periphery of the telescopic connecting rod 32, with their central regions radially bulging outward and their end regions tapering. Simultaneously, their left ends are evenly and circumferentially fixedly connected to the interior of the right end of the valve tower connection terminal 31, and their right ends are evenly and circumferentially fixedly connected to the interior of the left end of the female pipe connection terminal 33. This ensures reliable transmission of electrical energy between the valve tower connection terminal 31 and the female pipe connection terminal 33 via the multiple split flexible wires 34. To prevent the generation of corona, the effective diameter of the multiple split flexible wires 34 is no less than the diameter of the female pipe 2.

[0057] In order to facilitate the reliable connection between the pipeline connection terminal and the mother pipe, the mother pipe connection terminal 33 is an annular structure, and a plurality of threaded holes connecting its inner cavity and the outside are opened in the radial direction of its segment; in order to facilitate the reliable electrical connection between the valve tower connection terminal and the converter valve, a wire clamp 35 is coaxially fixedly connected to the axis center of the left end of the valve tower connection terminal 31, and a threaded hole 2 is opened on the wire clamp 35.

[0058] In order to ensure that the limiting clamping plate has good bearing strength and at the same time, to ensure its service life, the limiting clamping plate 325 is made of steel plate.

[0059] Preferably, the length of the plurality of ball grooves 327 in the same set of guide and centering mechanisms is not less than one-third of the length of the support sleeve 321. This ensures that the length of the force-bearing contact surface between the support sleeve and the sliding rod is not less than one-third, and prevents breakage due to the contact surface being too short.

[0060] In order to ensure that the sliding link has good load-bearing capacity and to effectively reduce the friction resistance during rolling contact with the sliding ball, the sliding link 322 is made of steel and is a solid rod with a smooth outer surface.

[0061] In order to reduce the frictional resistance during the rotation of the rotatable joint and to improve the following ability of the rotatable joint, the inner surface of the cylindrical accommodating cavity and the outer surface of the rotatable joint 326 are both smooth structures.

[0062] In order to ensure the stability of the spring performance and good mechanical properties, and at the same time, to avoid the problem of heat generation and to fully ensure a good energy absorption effect, the damping spring 323 is made of non-magnetic material.

[0063] In order to improve the load-bearing capacity of the sliding ball and at the same time, in order to effectively extend its service life, the sliding ball 324 is made of steel and is a solid sphere with a smooth outer surface; in order to enable the sliding ball to stably and reliably contact and cooperate with the sliding rod after assembly, the diameter of the sliding ball 324 is slightly larger than the wall thickness of the support sleeve 321, and when it is assembled in the corresponding ball groove 327, one quarter of its height is exposed on the outside of the ball groove 327.

[0064] As a preference, the area between the left end of the support sleeve 321 and the valve tower connection terminal 31 is filled with insulator 1, and the area between the right end of the sliding link 322 and the female pipe connection terminal 33 is filled with insulator 2.

[0065] In the present invention, a limit clamp is installed inside the support sleeve, and a guide circular plate is provided on the left side of the limit clamp. The left end of the sliding rod slides through the limit clamp and is fixedly connected to the guide circular plate. In this way, the maximum rightward sliding stroke of the sliding connecting rod relative to the support sleeve can be limited by the limit fit between the guide circular plate and the limit clamp. Four sets of guide positioning mechanisms are evenly arranged circumferentially in the portion to the right of the limit clamp, and the ball grooves in each set of guide positioning mechanisms are provided on the inner wall of the support sleeve along the length direction. Sliding balls are then installed in the ball grooves. In this way, the sliding balls in the four sets of guide positioning mechanisms can all roll in contact with the sliding rod body. This not only plays a guiding and centering role, but also can convert the radial force into axial force through the rolling contact between the sliding balls and the sliding rod body when the sliding rod is subjected to radial force, thereby avoiding the situation where the telescopic connecting rod breaks due to the radial force during vibration, and ensuring the reliability of the overall performance of the connecting hardware. A damping spring is provided in the support sleeve, and the two ends of the damping spring are respectively connected to the valve tower connection terminal and the guide circular plate. In this way, when the sliding link moves toward or away from the valve tower connection terminal, the damping spring can be used to provide elastic force or tension, thereby effectively buffering the impact force. At the same time, it is also beneficial to extend the sliding time of the sliding link within the sliding range. A cylindrical accommodating cavity is opened in the inner center of the guide circular plate, and the cylindrical accommodating cavity is connected to the outer side of the guide circular plate through a through hole. A rotatable joint is then rotatably assembled in the cylindrical accommodating cavity. The right end of the damping spring is then extended into the cylindrical accommodating cavity through the through hole and connected to the rotatable joint. In this way, when the sliding rod and the guide circular plate rotate radially relative to the support sleeve, the rotatable joint rotates relative to the guide circular plate to achieve a detwisting effect, thereby maintaining the synchronization state of the rotatable joint and the damping spring, avoiding radial torsion of the damping spring, and further improving the reliability and service life of the damping spring. A plurality of split flexible conductors are arranged on the periphery of the sliding connecting rod, and at the same time, the central area thereof is in a radially outward bulging state, and then the two ends are contracted and respectively connected to the valve tower connection terminal and the pipe mother connection terminal. In this way, a plurality of split flexible conductors can be used to realize reliable transmission of electrical energy between the two terminals. Since the split flexible conductors have good flexibility, they can adaptively adjust the extension state according to the extension degree of the telescopic connecting rod. In this way, they will not interfere with the normal sliding movement between the sliding rod and the support sleeve, thereby ensuring the stability and reliability of the sliding energy absorption effect. In addition, since the damping spring provided has the effect of extending the sliding time of the sliding rod, it can ensure that the plurality of split flexible conductors can have a longer time margin for adaptive shape changes, further ensuring the reliable transmission of electrical energy between the converter valve and the electrical equipment during an earthquake.

[0066] The connecting hardware has a simple structure, low manufacturing cost and convenient assembly process. At the same time, it has stable performance and is not easy to damage. It has a large range of sliding and good seismic energy absorption effect. It can effectively realize the decoupling of the valve tower and other electrical equipment under the action of earthquake, effectively reducing the disturbance effect between adjacent equipment without affecting the electrical performance.

[0067] The present invention provides a method for seismic-resistant connection of a converter valve, which uses a converter valve seismic-resistant connection hardware, and includes the following steps:

[0068] Step 1: Calculate the maximum displacement based on the allowable force on the converter valve terminals and the earthquake intensity simulation, and then determine parameters such as the sliding range and the damping coefficient of the damping spring. Based on these parameters, determine the size and model of the converter valve seismic connector 3.

[0069] Step 2: Prepare and assemble the converter valve anti-seismic connection fitting 3 according to the determined size and model, ensuring that under normal conditions, the left end of the sliding link 322 is located at a set distance to the left of the limit clamp 325 under the action of the damping spring 323. At the same time, ensure that the central area of ​​the multiple split flexible wires 34 is radially outwardly bulging, so that the sliding link 322 has both compression and tension buffer margins relative to the support sleeve 321;

[0070] Step 3: Connect the wire clamp 35 on the left end of the valve tower connection terminal 31 to the wire on the converter valve 1. Fasten the wire clamp 35 to the wire using the second connecting bolt inserted through the second threaded hole, thereby achieving electrical connection between the converter valve anti-seismic connection fitting 3 and the converter valve 1.

[0071] The mother tube connection terminal 33 is sleeved on the outside of the mother tube 2 connected to the electrical equipment 4, and the mother tube connection terminal 33 is fixedly connected to the mother tube 2 by a connecting bolt inserted into the threaded hole 1, thereby realizing the electrical connection between the converter valve anti-seismic connection hardware 3 and the electrical equipment 4 side. Figure 4 As shown;

[0072] Step 4: During an earthquake, when the electrical device 4 shakes, the electrical device 4 pushes the pipe mother connection terminal 33 through the pipe mother 2 to drive the sliding link 322 toward the valve tower connection terminal 31 or away from the valve tower connection terminal 31;

[0073] When the mother tube connection terminal 33 moves toward the valve tower connection terminal 31, the elastic force provided by the damping spring 323 to the sliding link 322 offsets the axial impact force and prolongs the time for the mother tube connection terminal 33 and the valve tower connection terminal 31 to approach each other. When the mother tube connection terminal 33 moves toward the valve tower connection terminal 31, the tension provided by the damping spring 323 to the sliding link 322 offsets the axial tension and prolongs the time for the mother tube connection terminal 33 and the valve tower connection terminal 31 to move away from each other. In this way, while reducing the impact of the electrical equipment 4 on the converter valve 1, the multiple split flexible wires 34 have more time margin to adaptively adjust their shapes according to the change in the distance between the mother tube connection terminal 33 and the valve tower connection terminal 31, thereby protecting the converter valve 1 and the multiple split flexible wires 34.

[0074] At the same time, when the damping spring 323 acts on the sliding link 322, several sliding balls 324 in the four sets of guide and centering mechanisms act radially on the sliding link 322, and the radial force generated by the sliding link 322 is converted into axial force through the rolling contact process, thereby avoiding the telescopic link 32 from breaking.

[0075] This method achieves decoupling between the converter valve and the electrical equipment under earthquake action by connecting the converter valve anti-seismic connecting hardware between the converter valve and the electrical equipment, effectively reducing the mutual disturbance influence between the converter valve and the electrical equipment. At the same time, when an earthquake occurs, the damping spring can be used to provide a buffering and energy absorption effect, which plays a good anti-seismic role. In addition, through the setting of the sliding ball, the radial force generated by the sliding rod during the earthquake can be converted into an axial force, thereby avoiding the breakage of the telescopic connection, further ensuring the reliable connection between the converter valve and the electrical equipment, and ensuring the stable transmission of electric energy.

Claims

1. A converter valve anti-seismic connection fitting, the converter valve anti-seismic connection fitting (3) comprising a valve tower connection terminal (31), characterized in that: It also includes a female tube connection terminal (33), a telescopic connecting rod (32) and a split soft wire (34); The pipe mother connection terminal (33) and the valve tower connection terminal (31) are distributed relatively to each other on the left and right sides; The telescopic connecting rod (32) includes a supporting sleeve (321), a limiting clamping plate (325), a guide centering mechanism, a guide circular plate (328), a rotatable joint (326), a damping spring (323), and a sliding connecting rod (322); The left end of the support sleeve (321) is coaxially fixedly connected to the center of the right end of the valve tower connection terminal (31); The outer diameter of the limiting clamping plate (325) is adapted to the inner diameter of the supporting sleeve (321), and is coaxially fixedly connected to the inside of the right section of the supporting sleeve (321); Four sets of guide and centering mechanisms are evenly distributed in the circumferential direction inside the support sleeve (321), and each set of guide and centering mechanisms includes a plurality of ball grooves (327) and a plurality of sliding balls (324); the ball grooves (327) are spherical crown-shaped, and the plurality of ball grooves (327) are sequentially opened on the inner wall of the support sleeve (321) along the length direction, and the left ends thereof start from the right end of the limit clamping plate (325), and the right ends thereof end at the right end of the support sleeve (321); the plurality of sliding balls (324) are rollably assembled in the plurality of ball grooves (327) in a one-to-one correspondence; The guide circular plate (328) is located on the left side of the limiting clamping plate (325), and its outer diameter is adapted to the inner diameter of the support sleeve (321), and is axially slidably assembled inside the support sleeve (321); a cylindrical accommodating cavity is coaxially provided inside the guide circular plate (328), and a through hole (329) is provided at the axis center of its left end to connect the cylindrical accommodating cavity with the left exterior; The size of the rotatable joint (326) is adapted to the size of the cylindrical accommodating cavity, and is rotatably assembled inside the cylindrical accommodating cavity; The left end of the damping spring (323) is connected to the axis of the right end of the valve tower connecting terminal (31), and the right end thereof extends into the interior of the cylindrical accommodating cavity through the through hole (329) and is connected to the center of the left end of the guide circular plate (328); The outer diameter of the sliding link (322) is adapted to the inner diameter of the limiting clamp (325), and the right end thereof is coaxially fixedly connected to the axis inside the left end of the female tube connection terminal (33); a section of the sliding link (322) on the left side is coaxially slidably inserted into the interior of the support sleeve (321), and simultaneously engages in rolling contact with a plurality of sliding balls (324) in the four groups of guide centering mechanisms; at the same time, the left end of the sliding link (322) can slide through the limiting clamp (325) and is coaxially fixedly connected to the right end of the guide circular plate (328); A plurality of split flexible wires (34) are evenly distributed around the periphery of the telescopic connecting rod (32), and their central area is radially outwardly bulging, and their two end areas are tapered. At the same time, their left ends are evenly fixedly connected around the inside of the right end of the valve tower connecting terminal (31), and their right ends are evenly fixedly connected around the inside of the left end of the pipe mother connecting terminal (33).

2. The anti-seismic connection fitting for a converter valve according to claim 1, characterized in that: The female pipe connection terminal (33) is an annular structure, and a plurality of threaded holes are provided in the radial direction of the middle section thereof, connecting the inner cavity and the outer side thereof; a wire clamp (35) is coaxially fixedly connected to the axis of the left end of the valve tower connection terminal (31), and a threaded hole (2) is provided on the wire clamp (35).

3. The anti-seismic connection fitting for a converter valve according to claim 2, characterized in that: The limiting clamping plate (325) is made of steel plate.

4. The anti-seismic connection fitting for a converter valve according to claim 3, characterized in that: The lengths of the plurality of ball grooves (327) in the same group of guide and centering mechanisms are not less than one third of the length of the support sleeve (321).

5. The anti-seismic connection fitting for a converter valve according to claim 4, characterized in that: The sliding connecting rod (322) is made of steel and is a solid rod with a smooth outer surface.

6. The anti-seismic connection fitting for a converter valve according to claim 5, characterized in that: The inner surface of the cylindrical accommodating cavity and the outer surface of the rotatable joint (326) are both smooth structures.

7. The anti-seismic connection fitting for a converter valve according to claim 6, characterized in that: The damping spring (323) is made of non-magnetic material.

8. The anti-seismic connection fitting for a converter valve according to claim 7, characterized in that: The sliding ball (324) is made of steel and is a solid sphere with a smooth outer surface. The diameter of the sliding ball (324) is slightly larger than the wall thickness of the support sleeve (321), and when it is assembled in the corresponding ball groove (327), one quarter of its height is exposed outside the ball groove (327).

9. The anti-seismic connection fitting for a converter valve according to claim 8, characterized in that: The area between the left end of the support sleeve (321) and the valve tower connection terminal (31) is filled with insulator 1, and the area between the right end of the sliding connecting rod (322) and the pipe mother connection terminal (33) is filled with insulator 2.

10. A method for seismic connection of a converter valve, using the seismic connection fitting of a converter valve according to any one of claims 2 to 9, characterized in that: The following steps are involved: Step 1: Calculate the maximum displacement based on the allowable force value of the converter valve terminal and the earthquake intensity simulation, and then determine the sliding range and the damping coefficient of the damping spring, and then determine the size model of the converter valve anti-seismic connection hardware (3) based on the above parameters; Step 2: Prepare and assemble the converter valve anti-seismic connection fitting (3) according to the determined size model, ensuring that under normal conditions, the left end of the sliding link (322) is located at a set distance to the left of the limit clamp (325) under the action of the damping spring (323), and at the same time, ensure that the central area of ​​the multiple split soft wires (34) is radially outwardly bulging, so that the sliding link (322) has both compression buffer margin and tension buffer margin relative to the support sleeve (321); Step 3: Connect the wire clamp (35) at the left end of the valve tower connection terminal (31) to the wire on the converter valve (1), and fix the wire clamp (35) to the wire by means of a connecting bolt 2 passing through the threaded hole 2, thereby achieving electrical connection between the converter valve anti-seismic connection fitting (3) and the converter valve (1); The tube mother connection terminal (33) is sleeved on the outside of the tube mother (2) connected to the electrical equipment (4), and the tube mother connection terminal (33) is fixedly connected to the tube mother (2) by a connecting bolt inserted into a threaded hole, thereby achieving electrical connection between the converter valve anti-seismic connection hardware (3) and the electrical equipment (4) side; Step 4: During an earthquake, when the electrical device (4) shakes, the electrical device (4) pushes the tube mother connection terminal (33) through the tube mother (2) to drive the sliding connecting rod (322) to move toward the valve tower connection terminal (31) or away from the valve tower connection terminal (31); When the mother tube connection terminal (33) moves toward the valve tower connection terminal (31), the elastic force provided by the damping spring (323) to the sliding link (322) is used to offset the axial impact force and prolong the time for the mother tube connection terminal (33) and the valve tower connection terminal (31) to approach each other. When the mother tube connection terminal (33) moves toward the valve tower connection terminal (31), the tension provided by the damping spring (323) to the sliding link (322) is used to offset the axial tension and prolong the time for the mother tube connection terminal (33) and the valve tower connection terminal (31) to move away from each other. Thus, while reducing the impact of the electrical equipment (4) on the converter valve (1), the multiple split soft wires (34) have more time margin to follow the change in the distance between the mother tube connection terminal (33) and the valve tower connection terminal (31) to adaptively adjust their shapes, and at the same time play a role in protecting the converter valve (1) and the multiple split soft wires (34); At the same time, when the damping spring (323) acts on the sliding link (322), the plurality of sliding balls (324) in the four sets of guide centering mechanisms act radially on the sliding link (322), and the radial force generated by the sliding link (322) is converted into an axial force by utilizing the rolling contact process, thereby preventing the telescopic link (32) from breaking.

Images