Direct current bushing

Abstract

The invention discloses a direct-current bushing, which relates to the technical field of power and electrical, and comprises a bushing body and a damping device, the casing pipe body comprises an indoor casing pipe and an outdoor casing pipe, and the indoor casing pipe and the outdoor casing pipe are connected through a middle flange. The damping device is arranged on the middle flange and comprises one or more sets of dampers, each set of damper comprises two dampers, the first ends of the two dampers intersect with each other at a preset included angle and are used for being connected with the supporting structure, and the second ends of the two dampers are connected with the middle flange. According to the direct-current sleeve provided by the invention, the acting force generated by seismic waves in all directions on the direct-current sleeve can be effectively reduced, the risk that the direct-current sleeve is damaged during an earthquake is reduced, the displacement of the direct-current sleeve can be reduced, and the anti-seismic performance of the direct-current sleeve is improved. Meanwhile, the inherent frequency of the direct-current bushing can be reduced to be beyond the excellent frequency of seismic waves, the risk that the direct-current bushing generates resonance during an earthquake is reduced, and the operation reliability of the direct-current bushing is improved.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and more specifically, to a DC bushing. Background Art

[0002] The DC bushing is used for power transmission connection between the valve hall and external important equipment, and the DC bushing needs to withstand the system voltage and current of the DC system. The safety and quality of the DC bushing directly affect whether the transmission line can operate safely and reliably. When a geological disaster occurs, such as an earthquake, the DC bushing will be damaged by the impact of the seismic wave, resulting in failure of the DC bushing.

[0003] Therefore, how to improve the seismic performance of DC bushings has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, an object of the present application is to provide a DC bushing to improve the seismic performance of the DC bushing.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] A DC bushing, comprising:

[0007] A bushing body, the bushing body comprising an indoor bushing and an outdoor bushing, the indoor bushing and the outdoor bushing being connected via an intermediate flange;

[0008] A vibration reduction device is arranged on the middle flange, and the vibration reduction device includes one or more groups of vibration reducers, each group of vibration reducers includes two dampers, the first ends of the two dampers are arranged obliquely along the axial direction of the sleeve body and intersect at a preset angle, the first ends of the two dampers are used to be connected to the supporting structure, and the second ends of the two dampers are respectively connected to the middle flange.

[0009] Optionally, in the above-mentioned DC bushing, the vibration damping device also includes a mounting plate, which limits a mounting hole for passing through the bushing body, so that the mounting plate can be sleeved on the outside of the bushing body and connected to the intermediate flange through fasteners, and the vibration damper is mounted on the mounting plate.

[0010] Optionally, in the above-mentioned DC bushing, a fixing member for mounting the shock absorber is provided on the mounting plate, the fixing member includes a connecting portion and a bending portion located at both ends of the connecting portion, the extension lines of the two bending portions have the preset angle between them, the two dampers are respectively arranged parallel to the two bending portions, and the second ends of the two dampers are respectively connected to the two bending portions so that the first ends of the two dampers intersect at the preset angle.

[0011] Optionally, in the above-mentioned DC bushing, the mounting plate has a first side and a second side that are arranged opposite to each other, and the first side and the second side are respectively provided with one or more groups of the vibration absorbers, and each group of the vibration absorbers on the first side and each group of the vibration absorbers on the second side are respectively located on two oppositely arranged mounting surfaces of the mounting plate.

[0012] Optionally, the DC bushing further comprises a current-carrying core tube disposed in the bushing body, and the current-carrying core tube comprises a current-carrying conduit and an insulating core body sleeved on the outside of the current-carrying conduit.

[0013] Optionally, in the above-mentioned DC bushing, the indoor bushing includes an indoor head structure and an indoor insulator detachably connected to the indoor head structure; the outdoor bushing includes an outdoor head structure and an outdoor insulator detachably connected to the outdoor head structure; the indoor insulator is detachably connected to the outdoor insulator via the intermediate flange.

[0014] Optionally, in the above DC bushing, the indoor head structure includes an indoor grading ring arranged outside the first end of the indoor insulator and an indoor wiring terminal located inside the indoor grading ring, the indoor wiring terminal is connected to the first end of the current-carrying conduit, and the second end of the indoor insulator is connected to the intermediate flange;

[0015] The outdoor head structure includes an outdoor grading ring arranged outside the first end of the outdoor insulator and an outdoor wiring terminal located inside the outdoor grading ring, the outdoor wiring terminal is connected to the second end of the current-carrying conduit, and the second end of the outdoor insulator is connected to the intermediate flange.

[0016] Optionally, in the above-mentioned DC bushing, an elastic device is provided at any end of the bushing body, and the elastic device includes a mounting seat, a reset elastic member and a spring pressure plate. The mounting seat is arranged in the bushing body and connected to any end of the bushing body. The reset elastic member is located in the mounting seat, one end of the reset elastic member abuts against the mounting seat, and the other end of the reset elastic member abuts against the spring pressure plate, and the spring pressure plate is sleeved on the current-carrying conduit.

[0017] Optionally, in the above-mentioned DC bushing, the elastic device also includes a spring guide rod, the reset elastic member is sleeved on the spring guide rod, the spring guide rod is arranged along the axial direction of the bushing body, and the spring guide rod is fixedly connected to the mounting seat.

[0018] Optionally, in the above-mentioned DC bushing, the reset elastic members include two, and the two reset elastic members are respectively located on both sides of the current-carrying conduit, and the spring guide rod is adapted to the reset elastic member.

[0019] Optionally, in the above-mentioned DC bushing, the elastic device is arranged between the indoor wiring terminal and the first end of the indoor insulator, the mounting seat of the elastic device is connected to the indoor wiring terminal through an indoor flange, the mounting seat of the elastic device is connected to the first end of the indoor insulator through an indoor transition flange, and the indoor equalizing ring is connected to the indoor transition flange; the outdoor wiring terminal is connected to the first end of the outdoor insulator through an outdoor flange assembly.

[0020] Optionally, in the above-mentioned DC bushing, the outdoor flange assembly includes an outdoor flange connected to the outdoor terminal and an outdoor transition flange connected to the first end of the outdoor insulator, the outdoor flange is connected to the outdoor transition flange, an outdoor shielding ring is arranged on the outer side of the second end of the current-carrying conduit, the outdoor shielding ring is fixed to the inner side of the outdoor transition flange so that the outdoor shielding ring is located in the outdoor insulator, and the outdoor equalizing ring is connected to the outdoor transition flange; an indoor shielding ring is arranged on the outer side of the elastic device, and the indoor shielding ring is fixed to the inner side of the indoor transition flange.

[0021] Optionally, in the above DC bushing, an indoor gland is provided between the indoor wiring terminal and the indoor flange, the indoor gland is sealingly connected to the indoor flange, and the indoor wiring terminal and the first end of the current-carrying conduit are interference-fitted through an indoor current-carrying band, and an indoor clamping groove for fixing the indoor current-carrying band is provided on the inner wall of the indoor wiring terminal;

[0022] An outdoor gland is provided between the outdoor flange and the outdoor transition flange, the outdoor gland is sealingly connected to the outdoor transition flange, and the outdoor wiring terminal and the second end of the current-carrying conduit are interference fit through an outdoor current-carrying strap, and an outdoor clamping groove for fixing the outdoor current-carrying strap is provided on the inner wall of the outdoor wiring terminal.

[0023] Optionally, in the above DC bushing, the intermediate flange includes an intermediate transition flange and a connecting sleeve connected to the intermediate transition flange, a first side of the intermediate transition flange is connected to the second end of the indoor insulator, and the connecting sleeve is connected to the second end of the outdoor insulator;

[0024] A clamping sleeve is connected to the second side of the intermediate transition flange, the clamping sleeve is located inside the connecting sleeve, and the clamping sleeve is interference fit with the insulating core;

[0025] The connecting sleeve is provided with a test tap device so that the insulating core is grounded and connected through the test tap device.

[0026] The DC bushing provided by the present application, the indoor bushing and the outdoor bushing are connected by an intermediate flange, and one or more groups of shock absorbers are arranged on the intermediate flange, each group of shock absorbers consists of two intersecting dampers, and the first ends of the two dampers intersecting can be connected to a supporting structure such as a wall, and the second ends of the two dampers are respectively connected to the intermediate flange, so that the overall stiffness of the DC bushing can be reduced. From the above examples, it can be seen that the DC bushing provided by the present application, by arranging a shock absorbing device on the intermediate flange connected to the indoor bushing and the outdoor bushing, and the two dampers are arranged to intersect at a preset angle, can effectively reduce the force generated by seismic waves in all directions on the DC bushing, reduce the risk of damage to the DC bushing during an earthquake, and reduce the displacement of the DC bushing, thereby improving the seismic performance of the DC bushing. At the same time, without changing the main structure of the DC bushing, the system stiffness of the DC bushing can be reduced by the shock absorbing device, so that the natural frequency of the DC bushing itself is reduced to a frequency other than the superior frequency of the seismic wave, which can reduce the risk of resonance of the DC bushing during an earthquake and improve the operating reliability of the DC bushing.

[0027] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown separately in the drawings can be combined with each other arbitrarily, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the structure of a DC bushing provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the structure of an indoor head structure provided by an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the structure of an outdoor head provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the structure of the intermediate flange provided in an embodiment of the present application;

[0033] Figure 5 A schematic diagram of the structure of the vibration reduction device provided in an embodiment of the present application;

[0034] Figure 6 A schematic diagram of the assembly of the vibration reduction device provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of the structure of the insulating core provided in an embodiment of the present application.

[0036] Among them, 100 is the bushing body, 101 is the indoor bushing, 1011 is the indoor head structure, 1012 is the indoor insulator, 1013 is the indoor equalizing ring, 1014 is the indoor terminal, 1015 is the elastic device, 1015a is the mounting seat, 1015b is the reset elastic member, 1015c is the spring pressure plate, 1015d is the spring guide rod, 1015e is the spring pressure head, 1015f is the special nut, 1016 is the indoor flange, 1017 is the indoor transition flange, 1018 is the indoor shielding ring, 1019 is an indoor gland, 1020 is an indoor current-carrying strap, 102 is an outdoor bushing, 1021 is an outdoor head structure, 1022 is an outdoor insulator, 1023 is an outdoor grading ring, 1024 is an outdoor terminal, 1025 is an outdoor flange, 1026 is an outdoor transition flange, 1027 is an outdoor shielding ring, 1028 is an outdoor gland, 1029 is an outdoor current-carrying strap, 103 is an intermediate flange, 1031 is an intermediate transition flange, 1032 is a connecting sleeve, 1033 is a clamping sleeve, and 1034 is a test tap device;

[0037] 200 is a current-carrying core tube, 201 is a current-carrying conduit, 202 is an insulating core body, 2021 is a rolled tube, and 2022 is an epoxy core body;

[0038] 300 is a vibration reduction device, 301 is a vibration absorber, 3011 is a damper, 302 is a mounting plate, 303 is a fixing member, 3031 is a connecting portion, and 3032 is a bending portion. DETAILED DESCRIPTION

[0039] The core of the present application is to provide a DC bushing to improve the seismic performance of the DC bushing.

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] The DC bushing is used for power transmission connection between the valve hall and external important equipment, and the DC bushing needs to withstand the system voltage and current of the DC system. The safety and quality of the DC bushing directly affect whether the transmission line can operate safely and reliably. When a geological disaster occurs, such as an earthquake, the DC bushing will be damaged by the impact of the seismic wave, resulting in failure of the DC bushing.

[0042] For this reason, Figure 1 and Figure 5 As shown, the embodiment of the present application discloses a DC bushing, including a bushing body 100 and a vibration reduction device 300. By arranging the vibration reduction device 300 on the intermediate flange 103 connected to the indoor bushing 101 and the outdoor bushing 102, and the two dampers 3011 are arranged to intersect at a preset angle, the force exerted on the DC bushing by seismic waves in all directions can be effectively reduced, the risk of damage to the DC bushing during an earthquake can be reduced, and the displacement of the DC bushing can be reduced, thereby improving the seismic performance of the DC bushing. At the same time, without changing the body structure of the DC bushing, the system stiffness of the DC bushing can be reduced by the vibration reduction device 300, so that the natural frequency of the DC bushing itself is reduced to a frequency other than the dominant frequency of the seismic wave, the risk of resonance of the DC bushing during an earthquake can be reduced, and the operating reliability of the DC bushing can be improved.

[0043] The following will be combined Figures 1 to 6 The DC bushing disclosed in the embodiment of the present application is specifically explained and illustrated.

[0044] Among them, Figure 1 As shown, the bushing body 100 may include an indoor bushing 101 and an outdoor bushing 102, and the indoor bushing 101 and the outdoor bushing 102 are connected via an intermediate flange 103. Specifically, the indoor bushing 101 includes an indoor head structure 1011 and an indoor insulator 1012 detachably connected to the indoor head structure 1011, and the outdoor bushing 102 includes an outdoor head structure 1021 and an outdoor insulator 1022 detachably connected to the outdoor head structure 1021, and the indoor insulator 1012 and the outdoor insulator 1022 are detachably connected via the intermediate flange 103.

[0045] like Figure 5 and Figure 6As shown, the vibration reduction device 300 can be arranged on the middle flange 103, and the vibration reduction device 300 can include one or more groups of vibration absorbers 301, that is, the vibration reduction device 300 can use one group of vibration absorbers 301, and can also use two, three, four or more groups of vibration absorbers 301. Among them, each group of vibration absorbers 301 includes two dampers 3011, the first ends of the two dampers 3011 can be connected to a supporting structure such as a wall, and the second ends of the two dampers 3011 are respectively connected to the middle flange 103. At the same time, the first ends of the two dampers 3011 can be arranged along the axial direction of the bushing body 100 and intersect at a preset angle, and the preset angle can be 30°, 45° or 60°, so that the damper 3011 can generate a component force along the axial, horizontal and vertical directions of the DC bushing, which can effectively reduce the force generated by the seismic waves in the axial, horizontal and vertical directions of the DC bushing on the DC bushing, reduce the risk of damage to the DC bushing during an earthquake, and reduce the displacement of the DC bushing, thereby improving the seismic performance of the DC bushing. At the same time, without changing the main structure of the DC bushing, the system stiffness of the DC bushing can be reduced by the vibration reduction device 300, so that the natural frequency of the DC bushing itself is reduced to a frequency other than the superior frequency of the seismic wave, which can reduce the risk of resonance of the DC bushing during an earthquake and improve the operating reliability of the DC bushing. It should be noted that, in order to meet the reliable operation requirements of the DC bushing, the damper 3011 can select a non-viscous damper, such as a friction damper, a metal yield damper or a viscoelastic damper, etc., which is not limited herein.

[0046] In some embodiments, Figure 5 and Figure 6 As shown, the vibration damping device 300 may further include a mounting plate 302, and the mounting plate 302 has a mounting hole that can pass through the sleeve body 100, wherein the inner diameter of the mounting hole needs to be larger than the outer diameter of the sleeve body 100, and needs to be smaller than the outer diameter of the middle flange 103, so that the mounting plate 302 can be sleeved on the outer side of the sleeve body 100 and connected to the middle flange 103 by fasteners such as bolts, and the vibration damper 301 can be installed on the mounting plate 302 at the same time.

[0047] In some embodiments, the mounting plate 302 may be a rectangular plate, and the mounting plate 302 has two oppositely disposed sides. For ease of understanding, the two sides are defined as a first side and a second side, wherein the first side is the upper side of the mounting plate 302, and the second side is the lower side of the mounting plate 302. At the same time, one or more groups of shock absorbers 301 are respectively disposed on the first side and the second side, that is, one group of shock absorbers 301 may be disposed on the first side of the mounting plate 302, or two, three, four or more groups of shock absorbers 301 may be disposed, and one group of shock absorbers 301 may be disposed on the second side of the mounting plate 302, or two, three, four or more groups of shock absorbers 301 may be disposed, and the number of shock absorbers 301 disposed on the two sides of the mounting plate 302 may be equal or unequal, which may be determined specifically according to actual needs. Preferably, the number of vibration absorbers 301 disposed on the two sides of the mounting plate 302 is equal, and each group of vibration absorbers 301 on the first side of the mounting plate 302 and each group of vibration absorbers 301 on the second side of the mounting plate 302 are respectively located on two oppositely disposed mounting surfaces of the mounting plate 302. It should be noted that the mounting surfaces of the mounting plate 302 are two planes of the mounting plate 302 along the axial direction of the sleeve body 100.

[0048] In some embodiments, Figure 5 As shown, a fixing member 303 is provided on the mounting plate 302, so that the shock absorber 301 can be installed on the fixing member 303. Specifically, the fixing member 303 may include a connecting portion 3031 and a bending portion 3032 located at both ends of the connecting portion 3031, wherein the extension lines of the two bending portions 3032 have a preset angle between them, wherein the bending portion 3032 and the connecting portion 3031 may be an integral structure, or a split structure and connected by welding. At the same time, the fixing member 303 may be fixed to the mounting plate 302 by welding, and the two dampers 3011 may be respectively arranged parallel to the two bending portions 3032, and the second ends of the two dampers 3011 may be respectively connected to the two bending portions 3032 by fasteners such as bolts, so that the first ends of the two dampers 3011 intersect at a preset angle.

[0049] In some embodiments, Figure 5 As shown, the first end and the second end of the damper 3011 are respectively provided with connecting rings, and the plane where the connecting ring of the first end of the damper 3011 is located is perpendicular to the plane where the connecting ring of the second end of the damper 3011 is located, so that when the connecting ring of the second end of the damper 3011 is connected to the bending portion 3032 of the fixing member 303 by fasteners such as bolts, the connecting rings of the first ends of the two dampers 3011 in each group of shock absorbers 301 can be stacked along the axial direction of the sleeve body 100, so that the connecting rings of the first ends of the two dampers 3011 can be easily connected to a supporting structure such as a wall at the same time.

[0050] like Figure 1As shown, the DC bushing further includes a current-carrying core tube 200, and the current-carrying core tube 200 can be arranged in the bushing body 100. The current-carrying core tube 200 can be composed of a current-carrying conduit 201 for carrying current and an insulating core body 202 sleeved on the outside of the current-carrying conduit 201 for insulation.

[0051] In some embodiments, Figure 1 and Figure 7 As shown, the insulating core 202 may include a rolled tube 2021 and an epoxy core 2022 sleeved on the outside of the rolled tube 2021. The epoxy core 2022 is connected to the rolled tube 2021 by casting, and the epoxy core 2022 is a spindle-shaped cylinder, so that the epoxy core 2022 has a large middle diameter and small diameters at both ends. While increasing the inner cavity space of the bushing body 100 and ensuring temperature convection at both ends of the indoor bushing 101 and the outdoor bushing 102, thereby achieving temperature balance of the DC bushing, the stiffness of the insulating core 202 is increased, thereby increasing the stiffness and strength of the entire current-carrying core tube 200. Among them, the indoor side of the insulating core 202 is threadedly connected to the current-carrying conduit 201 through indoor special nuts, and the outdoor side of the insulating core 202 is connected to the current-carrying conduit 201 through outdoor special nuts and pins, thereby ensuring the reliability of the connection between the insulating core 202 and the current-carrying conduit 201, so that the insulating core 202 has a better insulation effect.

[0052] like Figure 1 As shown, the indoor bushing 101 may include an indoor head structure 1011 and an indoor insulator 1012 detachably connected to the indoor head structure 1011. The outdoor bushing 102 may include an outdoor head structure 1021 and an outdoor insulator 1022 detachably connected to the outdoor head structure 1021. Meanwhile, the indoor insulator 1012 and the outdoor insulator 1022 are detachably connected via the intermediate flange 103.

[0053] In some embodiments, Figure 2 As shown, the indoor head structure 1011 may include an indoor grading ring 1013 disposed outside the first end of the indoor insulator 1012 and an indoor wiring terminal 1014 located in the indoor grading ring 1013. An indoor clamping groove for fixing the indoor current-carrying band 1020 is disposed on the inner wall of the indoor wiring terminal 1014. The indoor wiring terminal 1014 and the first end of the current-carrying conduit 201 are interference-fitted through the indoor current-carrying band 1020 fixed in the indoor clamping groove to ensure that the indoor current-carrying band 1020 is in contact with the first end of the current-carrying conduit 201, thereby achieving current flow. The indoor grading ring 1013 can evenly distribute high voltage around the indoor wiring terminal 1014, ensuring that there is no potential difference between the various annular parts of the indoor grading ring 1013, so as to achieve the effect of voltage balancing. Figure 4As shown, the second end of the indoor insulator 1012 is provided with an indoor connecting flange which is sealed to the intermediate flange 103 by fasteners such as bolts, and the indoor connecting flange is connected to the second end of the indoor insulator 1012 by casting. At the same time, a sealing ring may be provided between the indoor connecting flange and the intermediate flange 103 so that the second end of the indoor insulator 1012 is sealed to the intermediate flange 103.

[0054] In some embodiments, Figure 3 As shown, the outdoor head structure 1021 may include an outdoor voltage-equalizing ring 1023 disposed outside the first end of the outdoor insulator 1022 and an outdoor terminal 1024 located in the outdoor voltage-equalizing ring 1023. The inner wall of the outdoor terminal 1024 is provided with an outdoor clamping groove for fixing an outdoor current-carrying strap 1029. The outdoor terminal 1024 and the second end of the current-carrying conduit 201 are interference-fitted through the outdoor current-carrying strap 1029 fixed in the outdoor clamping groove to ensure that the outdoor current-carrying strap 1029 is in contact with the second end of the current-carrying conduit 201, thereby achieving current flow. The outdoor voltage-equalizing ring 1023 can evenly distribute high voltage around the outdoor terminal 1024, ensuring that there is no potential difference between the various annular parts of the outdoor voltage-equalizing ring 1023, so as to achieve the voltage-equalizing effect. Figure 4 As shown, the second end of the outdoor insulator 1022 is provided with an outdoor connecting flange which is sealed and connected to the intermediate flange 103 by bolts, and the outdoor connecting flange is connected to the second end of the outdoor insulator 1022 by casting. At the same time, a sealing ring is provided between the outdoor connecting flange and the intermediate flange 103 so that the second end of the outdoor insulator 1022 is sealed and connected to the intermediate flange 103.

[0055] In some embodiments, an elastic device 1015 may be provided at either end of the sleeve body 100, that is, the elastic device 1015 may be provided at the indoor end of the sleeve body 100, or the elastic device 1015 may be provided at the outdoor end of the sleeve body 100. The spring device 1015 is sleeved on the outside of the current-carrying conduit 201 and is located inside the sleeve body 100. Figure 2As shown, the elastic device 1015 may include a mounting seat 1015a, a resetting elastic member 1015b and a spring pressure plate 1015c. The mounting seat 1015a is disposed in the sleeve body 100 and connected to any end of the sleeve body 100, the resetting elastic member 1015b may be located in the mounting seat 1015a, and one end of the resetting elastic member 1015b abuts against the mounting seat 1015a, and the other end of the resetting elastic member 1015b abuts against the spring pressure plate 1015c, so that the resetting elastic member 1015b is compressed by the spring pressure plate 1015c, and the spring pressure plate 1015c may be sleeved on the current-carrying conduit 201 by threaded cooperation with the current-carrying conduit 201. By means of the compression spring device 1015, a preload force can be applied to the indoor head structure 1011 or the outdoor head structure 1021, and at the same time, under the elastic force of the reset elastic member 1015b, a tension force can be applied to the bushing body 100, thereby increasing the rigidity of the DC bushing and reducing the displacement of the DC bushing during an earthquake. It should be noted that the reset elastic member 1015b can be a compression spring.

[0056] In some embodiments, Figure 2 As shown, in order to ensure that the elastic force of the reset elastic member 1015b is along the axial direction of the sleeve body 100, the elastic device 1015 further includes a spring guide rod 1015d, and the reset elastic member 1015b is sleeved on the spring guide rod 1015d. At the same time, the spring guide rod 1015d is parallel to the central axis of the sleeve body 100, and the spring guide rod 1015d is fixedly connected to the mounting seat 1015a, so that the reset elastic member 1015b can be elastically deformed along the spring guide rod 1015d, thereby ensuring that the elastic force of the reset elastic member 1015b is along the axial direction of the sleeve body 100.

[0057] In some embodiments, Figure 2As shown, in order to facilitate the installation of the spring guide rod 1015d, the spring pressure plate 1015c can be gap-matched with the current-carrying conduit 201, and the end of the spring guide rod 1015d can be inserted into the spring pressure plate 1015c, and can be screwed on the end of the spring guide rod 1015d and fastened to the spring pressure plate 1015c through a guide rod nut. At the same time, a special nut 1015f is provided on the side of the spring pressure plate 1015c away from the reset elastic member 1015b, and the special nut 1015f can be threadedly matched with the current-carrying conduit 201, so that the spring pressure plate 1015c and the special nut 1015f are abutted. At this time, the guide rod nut can be rotated in the opposite direction to disengage the guide rod nut from the spring pressure plate 1015c, so that the elastic force of the reset elastic member 1015b acts on the current-carrying conduit 201 through the special nut 1015f, thereby applying a tensile force to the bushing body 100, improving the rigidity of the DC bushing and reducing the displacement of the DC bushing during an earthquake. It should be noted that a sealing gasket can also be provided between the special nut 1015f and the spring pressure plate 1015c, so that the sealing gasket can be compressed by the special nut 1015f to ensure the sealing between the spring pressure plate 1015c and the current-carrying conduit 201.

[0058] In some embodiments, Figure 2 As shown, two reset elastic members 1015b can be used, and the two reset elastic members 1015b are respectively located on both sides of the current-carrying conduit 201. The spring guide rod 1015d is adapted to the reset elastic member 1015b, that is, each reset elastic member 1015b is sleeved on a spring guide rod 1015d. The two reset elastic members 1015b are compressed simultaneously by the spring pressure plate 1015c. It should be noted that the number of the reset elastic members 1015b can be but not limited to two, and can also be one, three, four or more, which can be determined according to the specific situation, and it is only necessary to ensure that all the reset elastic members 1015b can act on the entire DC bushing through the spring pressure plate 1015c.

[0059] In some embodiments, Figure 2 As shown, the elastic device 1015 also includes a spring pressure head 1015e, and the spring pressure head 1015e may include a protrusion and a pressure plate. The protrusion may extend into the inner cavity of the reset elastic member 1015b, and the pressure plate may compress the reset elastic member 1015b. The contact surface between the pressure plate and the reset elastic member 1015b is a plane, and even if the top of the reset elastic member 1015b is an inclined surface or other irregular structures, it will become a plane contact after being constrained by the pressure plate, which can further ensure that the elastic force of the reset elastic member 1015b is along the axial direction of the sleeve body 100.

[0060] In some embodiments, Figure 2As shown, the elastic device 1015 can be arranged between the indoor wiring terminal 1014 and the first end of the indoor insulator 1012, the spring device 1015 is sleeved on the outside of the current-carrying conduit 201, and the spring device 1015 is located in the indoor insulator 1012. The mounting seat 1015a of the elastic device 1015 is sealed and connected with the indoor wiring terminal 1014 through the indoor flange 1016 bolts, the mounting seat 1015a of the elastic device 1015 is sealed and connected with the first end of the indoor insulator 1012 through the indoor transition flange 1017 bolts, and the indoor grading ring 1013 is sealed and connected to the indoor transition flange 1017 through bolts and other fasteners. Specifically, the first end of the indoor insulator 1012 is connected to an indoor connection flange by casting, and a sealing ring is provided between the indoor connection flange of the first end of the indoor insulator 1012 and the indoor transition flange 1017 to ensure a sealed connection between the first end of the indoor insulator 1012 and the indoor transition flange 1017. A preload force can be applied to the indoor head structure 1011 by compressing the reset elastic member 1015b of the spring device 1015, and at the same time, under the elastic force of the reset elastic member 1015b, a tension force can be applied to the bushing body 100, thereby improving the rigidity of the DC bushing and reducing the displacement of the DC bushing during an earthquake.

[0061] At the same time, if Figure 2 As shown, an indoor shielding ring 1018 is arranged on the outer side of the spring device 1015, and the indoor shielding ring 1018 is fixed to the inner side of the indoor transition flange 1017 by bolts, so that the electric field distribution at the first end of the current-carrying conduit 201 is more uniform. In addition, in order to ensure the sealing of the indoor connection terminal 1014 and the indoor flange 1016, an indoor gland 1019 is arranged between the indoor connection terminal 1014 and the indoor flange 1016, and the indoor gland 1019 is sealed and connected to the indoor flange 1016 by bolts. The indoor gland 1019 can be specifically arranged in the groove of the indoor flange 1016, and is sealed and connected to the indoor flange 1016 by a sealing ring.

[0062] In some embodiments, Figure 3As shown, the outdoor terminal 1024 is connected to the first end of the outdoor insulator 1022 through the outdoor flange 1025 assembly. Specifically, the outdoor flange 1025 assembly includes an outdoor flange 1025 that is bolt-sealed to the outdoor terminal 1024 and an outdoor transition flange 1026 that is bolt-sealed to the first end of the outdoor insulator 1022. The first end of the outdoor insulator 1022 is connected to the outdoor connection flange by casting, and a sealing ring is provided between the outdoor connection flange at the first end of the outdoor insulator 1022 and the outdoor transition flange 1026 to ensure a sealed connection between the first end of the outdoor insulator 1022 and the outdoor transition flange 1026. The outdoor flange 1025 is bolt-sealed to the outdoor transition flange 1026, and an outdoor shielding ring 1027 is provided on the outer side of the second end of the current-carrying conduit 201 to make the electric field distribution at the second end of the current-carrying conduit 201 more uniform. Furthermore, the outdoor shielding ring 1027 is fixed to the inner side of the outdoor transition flange 1026 by bolts, so that the outdoor shielding ring 1027 is located inside the outdoor insulator 1022, and the outdoor grading ring 1023 is sealed and connected to the outdoor transition flange 1026 by bolts. In addition, in order to ensure the sealing of the connection between the outdoor flange 1025 and the outdoor transition flange 1026, an outdoor gland 1028 is provided between the outdoor flange 1025 and the outdoor transition flange 1026, and the outdoor gland 1028 is sealed and connected to the outdoor transition flange 1026 by bolts. The outdoor gland 1028 can be specifically provided in the groove of the outdoor transition flange 1026, and is sealed and connected to the outdoor transition flange 1026 by a sealing ring.

[0063] In some embodiments, Figure 4 As shown, the intermediate flange 103 may include an intermediate transition flange 1031 and a connecting sleeve 1032 connected to the intermediate transition flange 1031. The first side of the intermediate transition flange 1031 is sealed and connected to the indoor connecting flange at the second end of the indoor insulator 1012 through bolts, and the connecting sleeve 1032 is sealed and connected to the outdoor connecting flange at the second end of the outdoor insulator 1022 through bolts. At the same time, a clamping sleeve 1033 is connected to the second side of the intermediate transition flange 1031. The clamping sleeve 1033 is located inside the connecting sleeve 1032. The clamping sleeve 1033 is interference-fitted with the insulating core 202 to fix the current-carrying core tube 200 and prevent the current-carrying core tube 200 from shaking. A test tap device 1034 is provided on the connecting sleeve 1032 so that the insulating core 202 is grounded through the test tap device 1034, thereby meeting the grounding requirement of the insulating core 202.

[0064] The terms "first" and "second" and the like in the specification and claims of this application and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0065] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC bushing, characterized in that: include: A bushing body (100), the bushing body (100) comprising an indoor bushing (101) and an outdoor bushing (102), the indoor bushing (101) and the outdoor bushing (102) being connected via an intermediate flange (103); A vibration reduction device (300) is arranged on the middle flange (103), the vibration reduction device (300) comprises one or more groups of vibration reducers (301), each group of vibration reducers (301) comprises two dampers (3011), the first ends of the two dampers (3011) are arranged obliquely along the axial direction of the sleeve body (100) and intersect at a preset angle, the first ends of the two dampers (3011) are used to be connected to a supporting structure, and the second ends of the two dampers (3011) are respectively connected to the middle flange (103).

2. The DC bushing according to claim 1, characterized in that: The vibration damping device (300) further comprises a mounting plate (302), wherein the mounting plate (302) defines a mounting hole for passing through the sleeve body (100), so that the mounting plate (302) can be sleeved on the outside of the sleeve body (100) and connected to the middle flange (103) via fasteners, and the vibration damper (301) is mounted on the mounting plate (302).

3. The DC bushing according to claim 2, characterized in that: A fixing member (303) for mounting the shock absorber (301) is arranged on the mounting plate (302); the fixing member (303) comprises a connecting portion (3031) and bending portions (3032) located at two ends of the connecting portion (3031); the extension lines of the two bending portions (3032) have the preset angle between them; the two dampers (3011) are respectively arranged parallel to the two bending portions (3032); and the second ends of the two dampers (3011) are respectively connected to the two bending portions (3032), so that the first ends of the two dampers (3011) intersect at the preset angle.

4. The DC bushing according to claim 2, characterized in that: The mounting plate (302) has a first side and a second side that are arranged opposite to each other, and the first side and the second side are respectively provided with one or more groups of the vibration absorbers (301), and each group of the vibration absorbers (301) on the first side and each group of the vibration absorbers (301) on the second side are respectively located on two oppositely arranged mounting surfaces of the mounting plate (302).

5. The DC bushing according to claim 1, characterized in that: It also comprises a current-carrying core tube (200) which is arranged in the sleeve body (100), and the current-carrying core tube (200) comprises a current-carrying conduit (201) and an insulating core body (202) sleeved on the outside of the current-carrying conduit (201).

6. The DC bushing according to claim 5, characterized in that: The indoor bushing (101) comprises an indoor head structure (1011) and an indoor insulator (1012) detachably connected to the indoor head structure (1011); the outdoor bushing (102) comprises an outdoor head structure (1021) and an outdoor insulator (1022) detachably connected to the outdoor head structure (1021); the indoor insulator (1012) and the outdoor insulator (1022) are detachably connected via the intermediate flange (103).

7. The DC bushing according to claim 6, characterized in that: The indoor head structure (1011) comprises an indoor grading ring (1013) arranged outside the first end of the indoor insulator (1012) and an indoor wiring terminal (1014) located inside the indoor grading ring (1013), the indoor wiring terminal (1014) being connected to the first end of the current-carrying conduit (201), and the second end of the indoor insulator (1012) being connected to the middle flange (103); The outdoor head structure (1021) comprises an outdoor voltage-equalizing ring (1023) arranged outside the first end of the outdoor insulator (1022) and an outdoor wiring terminal (1024) located inside the outdoor voltage-equalizing ring (1023); the outdoor wiring terminal (1024) is connected to the second end of the current-carrying conduit (201); and the second end of the outdoor insulator (1022) is connected to the intermediate flange (103).

8. The DC bushing according to claim 7, characterized in that: An elastic device (1015) is provided at any end of the sleeve body (100), and the elastic device (1015) comprises a mounting seat (1015a), a reset elastic member (1015b) and a spring pressure plate (1015c); the mounting seat (1015a) is provided in the sleeve body (100) and connected to any end of the sleeve body (100); the reset elastic member (1015b) is located in the mounting seat (1015a); one end of the reset elastic member (1015b) abuts against the mounting seat (1015a), and the other end of the reset elastic member (1015b) abuts against the spring pressure plate (1015c); and the spring pressure plate (1015c) is sleeved on the current-carrying conduit (201).

9. The DC bushing according to claim 8, characterized in that: The elastic device (1015) further comprises a spring guide rod (1015d), the reset elastic member (1015b) is sleeved on the spring guide rod (1015d), the spring guide rod (1015d) is arranged along the axial direction of the sleeve body (100), and the spring guide rod (1015d) is fixedly connected to the mounting seat (1015a).

10. The DC bushing according to claim 9, characterized in that: The resetting elastic members (1015b) include two, and the two resetting elastic members (1015b) are respectively located on both sides of the current-carrying conduit (201), and the spring guide rod (1015d) is adapted to the resetting elastic member (1015b).

11. The DC bushing according to claim 8, characterized in that: The elastic device (1015) is arranged between the indoor wiring terminal (1014) and the first end of the indoor insulator (1012); the mounting seat (1015a) of the elastic device (1015) is connected to the indoor wiring terminal (1014) via an indoor flange (1016); the mounting seat (1015a) of the elastic device (1015) is connected to the first end of the indoor insulator (1012) via an indoor transition flange (1017); the indoor equalizing ring (1013) is connected to the indoor transition flange (1017); and the outdoor wiring terminal (1024) is connected to the first end of the outdoor insulator (1022) via an outdoor flange assembly.

12. The DC bushing according to claim 11, characterized in that: The outdoor flange assembly comprises an outdoor flange (1025) connected to the outdoor terminal (1024) and an outdoor transition flange (1026) connected to the first end of the outdoor insulator (1022); the outdoor flange (1025) is connected to the outdoor transition flange (1026); an outdoor shielding ring (1027) is arranged on the outer side of the second end of the current-carrying conduit (201); the outdoor shielding ring (1027) is fixed to the inner side of the outdoor transition flange (1026) so that the outdoor shielding ring (1027) is located inside the outdoor insulator (1022); the outdoor equalizing ring (1023) is connected to the outdoor transition flange (1026); an indoor shielding ring (1018) is arranged on the outer side of the elastic device (1015); the indoor shielding ring (1018) is fixed to the inner side of the indoor transition flange (1017).

13. The DC bushing according to claim 12, characterized in that: An indoor gland (1019) is provided between the indoor wiring terminal (1014) and the indoor flange (1016); the indoor gland (1019) is sealingly connected to the indoor flange (1016); the indoor wiring terminal (1014) and the first end of the current-carrying conduit (201) are interference-fitted via an indoor current-carrying band (1020); and an indoor clamping groove for fixing the indoor current-carrying band (1020) is provided on the inner wall of the indoor wiring terminal (1014); An outdoor pressure cover (1028) is provided between the outdoor flange (1025) and the outdoor transition flange (1026); the outdoor pressure cover (1028) is sealingly connected to the outdoor transition flange (1026); the outdoor wiring terminal (1024) and the second end of the current-carrying conduit (201) are interference-fitted via an outdoor current-carrying band (1029); and an outdoor clamping groove for fixing the outdoor current-carrying band (1029) is provided on the inner wall of the outdoor wiring terminal (1024).

14. The DC bushing according to claim 6, characterized in that: The intermediate flange (103) comprises an intermediate transition flange (1031) and a connecting sleeve (1032) connected to the intermediate transition flange (1031), a first side of the intermediate transition flange (1031) being connected to the second end of the indoor insulator (1012), and the connecting sleeve (1032) being connected to the second end of the outdoor insulator (1022); A clamping sleeve (1033) is connected to the second side of the intermediate transition flange (1031), the clamping sleeve (1033) is located inside the connecting sleeve (1032), and the clamping sleeve (1033) is interference fit with the insulating core (202); The connection sleeve (1032) is provided with a test tap device (1034) so ​​that the insulating core (202) is grounded through the test tap device (1034).

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