Shielding structure of solid-sealed polar pole for pole-mounted circuit breaker

Abstract

The invention relates to the technical field of solid-sealed polar poles, in particular to a shielding structure of a solid-sealed polar pole for a pole-mounted circuit breaker. Comprising a shell, and the shell is provided with a lower wire outlet conducting rod, an energy taking capacitor, an insulating pull rod, a lower end voltage sensor and an upper end voltage sensor; the first shield is arranged on the shell; the second shield is arranged on the shell; the third shield is arranged on the insulating pull rod; the fourth shield is arranged on the shell; the fifth shield is arranged on the shell; and the sixth shield is arranged on the shell. Electric field optimization and electromagnetic interference suppression are realized through combination of a plurality of local shields, electric field and noise shielding of current, voltage and energy-taking sensors is reliably realized, safe and accurate current and voltage measurement is ensured, the local shields select shielding cover and shielding ring structures, the technology is mature, the process is simple, the cost is controllable, the insulation reliability is improved, and the cost is reduced. And the risk of an insulation fault is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of solid-sealed poles, and in particular to a shielding structure of a solid-sealed pole for a pole-mounted circuit breaker. Background Art

[0002] The primary and secondary integrated pole-mounted circuit breaker is a complete set of pole-mounted electrical equipment that integrates advanced technologies such as electronic voltage sensors, electronic current sensors, electric energy metering modules, and high-speed fault transient recording. With the development of digital sensing technology and intelligent control technology, power technology is moving towards intelligence and digitalization, and the primary and secondary integrated pole-mounted circuit breaker has become a powerful guarantee for the safe operation of smart grids.

[0003] The sealed pole of the primary and secondary integrated pole-mounted circuit breaker adopts an integrated design. The electronic current sensor, electronic voltage sensor and energy-taking capacitor are all built into the pole, which improves the design integration and deepens the degree of primary and secondary integration. However, the increase in built-in components also leads to a decrease in the insulation performance of the pole. At the same time, the electronic current sensor and electronic voltage sensor will be affected by external electromagnetic interference, resulting in a decrease in the sensitivity and accuracy of the measurement signal, thereby affecting the safety of the power equipment. Summary of the invention

[0004] In order to overcome the shortcomings mentioned in the above background technology, the present invention provides a shielding structure of a sealed pole for a pole-mounted circuit breaker.

[0005] The technical solution is: a shielding structure of a sealed pole for a pole-mounted circuit breaker, comprising: A housing, wherein the housing is provided with a lower outlet conductive rod, an energy taking capacitor, an insulating pull rod, a lower end voltage sensor and an upper end voltage sensor; A first shield is provided on the housing and fixedly connected to the lower outlet conductive rod; A second shield is provided on the housing and on one side of the energy taking capacitor; A third shield is provided on the insulating pull rod; A fourth shield is provided on the housing and sleeved on the outer side of the lower outlet conductive rod; a fifth shield, disposed on the housing, wrapping the lower voltage sensor; The sixth shield is arranged on the housing and wraps the upper voltage sensor.

[0006] It is further explained that the first shield and the second shield are both a shielding ring, the third shield is a shielding cover, the fourth shield is a sandwich-type electromagnetic shielding structure, and the fifth shield and the sixth shield are both combined shielding structures.

[0007] Further description, an annular sealing groove is provided on the lower side of the shell, and the circuit breaker box is provided with a protrusion inserted into the annular sealing groove of the shell.

[0008] Further explanation includes: An outer sleeve is arranged in the annular sealing groove of the shell; The inner sleeve is arranged inside the outer sleeve.

[0009] Further explanation includes: The first slider has a plurality of first slide grooves, the shell is provided with circumferentially spaced first slide grooves, the number of the first slide grooves is the same as the number of the first sliders, the first sliders are slidably connected in adjacent first slide grooves, the shell is provided with circumferentially spaced connecting grooves, the number of the connecting grooves is the same as the number of the first sliders, the first slide grooves are connected with the outer sleeve through adjacent connecting grooves, and the first slide grooves are filled with gas.

[0010] Further explanation includes: The number of the second sliders is the same as that of the first sliders, the shell is provided with second slide grooves, the number of which is the same as that of the second sliders, the second sliders are slidably connected to adjacent second slide grooves, a first spring is provided between the second slider and the shell, the second slide groove is connected to the adjacent connecting groove, and the second slider is used to block the adjacent connecting groove.

[0011] Further explanation includes: The limiting members, the number of which is the same as that of the first sliding blocks, are slidably connected to the shell, a second spring is provided between the limiting members and the shell, and the limiting members are used to limit the adjacent first sliding blocks.

[0012] Further explanation includes: The third slider has a plurality of circumferentially spaced apart portions, the shell is provided with third slide grooves of the same number as the third sliders, the third slider is slidably connected to adjacent third slide grooves, the third slide grooves and the inner sleeve are both filled with liquid, a third spring is provided between the third slider and the shell, the third slide groove is connected to the inner sleeve through a first pipe, and the first pipe of the third slide groove penetrates the outer sleeve.

[0013] Further explanation includes: The supporting rings include a plurality of supporting rings which are distributed at intervals in the circumferential direction and are all fixedly connected to the inner side of the inner sleeve.

[0014] Further explanation includes: The fourth slider has a plurality of circumferentially spaced apart members, the shell is provided with fourth slide grooves having the same number as the fourth sliders, the fourth sliders are slidably connected to adjacent fourth slide grooves, the fourth slide grooves are filled with liquid, and the fourth slide grooves are connected to the inner sleeve via a second pipe.

[0015] The beneficial effects produced by adopting the above scheme are as follows: the present invention realizes electric field optimization and suppresses electromagnetic interference by combining multiple local shieldings, reliably realizes the electric field and noise shielding of current, voltage and energy acquisition sensors, ensures safe and accurate current and voltage measurement, and selects shielding cover and shielding ring structure for local shielding. The technology is mature, the process is simple, the cost is controllable, the insulation reliability is improved, and the risk of insulation failure is reduced.

[0016] When the device vibrates, the fourth slider presses the liquid in the adjacent fourth slide groove into the inner sleeve, causing the inner sleeve to expand and squeeze the gas in the outer sleeve, thereby driving the outer sleeve to expand, so that the outer sleeve maintains contact with the shell and the protrusion, thereby ensuring the sealing effect of the device in the vibrating state.

[0017] When the bolts fixing the device are loosened, the third slider presses the liquid in the adjacent third slide groove into the inner sleeve, and the inner sleeve expands and squeezes the gas in the outer sleeve, thereby expanding the outer sleeve so that the outer sleeve maintains contact with the shell and the protrusion, thereby ensuring the sealing effect of the device in a vibrating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the first shield and the second shield of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the lower outlet conductive rod and the first shielding of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the fifth shield and the sixth shield of the present invention; Figure 5 It is a three-dimensional structural cross-sectional view of the outer layer cover and the inner layer cover of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the outer sleeve, the inner sleeve and the support ring of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the second sliding block and the limiting member of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the third sliding groove and the third sliding block of the present invention.

[0019] In the above figures: 01: protrusion, 1: shell, 101: lower outlet conductive rod, 102: energy collection capacitor, 103: insulating pull rod, 104: lower end voltage sensor, 105: upper end voltage sensor, 106: first slide groove, 107: connecting groove, 108: second slide groove, 109: third slide groove, 110: fourth slide groove, 2: first shield, 3: second shield, 4: third shield, 5: fourth shield, 51: shielding layer one, 52: shielding layer two, 53: shielding layer three, 54: annular skeleton, 6: fifth shield, 7: sixth shield, 8: outer sleeve, 9: inner sleeve, 10: first slider, 11: second slider, 12: limit member, 13: third slider, 14: support ring, 15: fourth slider. DETAILED DESCRIPTION

[0020] The present invention will now be described more fully below with reference to the accompanying drawings, in which currently preferred embodiments of the present invention are shown. However, the present invention may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and these embodiments fully convey the scope of the present invention to the skilled person.

[0021] A shielding structure for a sealed pole for a pole-mounted circuit breaker, such as Figure 1-Figure 4 As shown, it includes a shell 1, and the shell 1 is provided with a lower outlet conductive rod 101, an energy-taking capacitor 102, an insulating rod 103, a lower end voltage sensor 104 and an upper end voltage sensor 105; a first shield 2 is arranged on the shell 1 and fixedly connected to the lower outlet conductive rod 101; a second shield 3 is arranged on the shell 1 and arranged on one side of the energy-taking capacitor 102; a third shield 4 is arranged on the insulating rod 103; a fourth shield 5 is arranged on the shell 1 and sleeved on the outer side of the lower outlet conductive rod 101; a fifth shield 6 is arranged on the shell 1 to wrap the lower end voltage sensor 104; a sixth shield 7 is arranged on the shell 1 to wrap the upper end voltage sensor 105.

[0022] In the above scheme, the aim is to achieve electric field optimization and suppress electromagnetic interference.

[0023] The first shield 2 is a shielding ring, located at the lower outlet of the pole, fixed on the lower outlet conductive rod 101, and made of metal, copper braided mesh can be selected, and its function is to optimize the electric field near the lower outlet conductive rod 101, and avoid the bad electric field generated by the terminal and other external structures of the lower outlet conductive rod 101, which may cause insulation damage to the electronic current sensor mounted on the conductive rod. At the same time, the shielding ring has certain electromagnetic wave absorption and reflection performance, and can shield the stray electromagnetic interference in the surrounding environment.

[0024] The second shield 3 is a shielding ring, which is located at the lead-out line of the static end of the arc extinguishing chamber and fixed on the lead-out terminal of the static end of the arc extinguishing chamber. The material is metal, and a copper braided mesh can be selected. Its function is to optimize the electric field at the energy-taking capacitor 102, avoid electric field distortion near the energy-taking capacitor 102, and ensure the reliability of capacitor insulation, especially the reliability of surface insulation. The energy-taking capacitor 102 adopts a high-voltage ceramic capacitor. The high-voltage end of the energy-taking capacitor 102 is connected to the static end of the arc extinguishing chamber through a copper lead, and the low-voltage end of the energy-taking capacitor 102 is connected to the low-voltage capacitor through a shielding wire. The shielding wire adopts a high-temperature resistant shielding wire, and the outer shielding is in the form of a silver-plated mesh shielding. The outer sheath material is Teflon, which is resistant to high temperatures above 150 degrees Celsius to ensure that it can withstand the temperature during the epoxy resin vacuum casting process.

[0025] The third shield 4 is the sliding connection and shielding structure of the moving end of the vacuum arc extinguishing chamber. The sliding connection adopts a spring contact finger solution. Compared with the soft connection solution, the moving connection part of the spring contact finger solution is wrapped and shielded by the contact seat of the lower outlet conductive rod 101 and the shielding cover, so the electric field uniformity is better. During the opening process, the insulating pull rod 103 drives the conductive clamp and the moving end of the arc extinguishing chamber to move downward. In the opening state, the exposed part of the insulating pull rod 103 insert is also within the shielding range of the shielding cover. The third shield 4 structure ensures that the moving end of the arc extinguishing chamber has excellent electric field shielding effect even during movement. The shielding cover is formed by thin metal plate, and stainless steel plate can be selected. One end of the stud screw is connected to the moving end of the arc extinguishing chamber through the conductive clamp, and the other end is connected to the insulating pull rod 103.

[0026] The fourth shield 5 is a sandwich electromagnetic shielding structure, and three layers of sandwich electromagnetic shielding are arranged outside the electronic current sensor coil. The electronic current sensor uses a Rogowski coil as a sensor, which has the advantages of good insulation performance, large dynamic range, small size, and light weight. The Rogowski coil is made of enameled wire evenly wound on a ring frame 54, and the frame is made of non-ferromagnetic materials such as plastic or ceramic, which eliminates the problem of magnetic saturation of traditional transformers.

[0027] The fourth shield 5 is respectively shielding layer 1 51, shielding layer 2 52, and shielding layer 3 53 from outside to inside. Shielding layer 1 51 is made of materials with high conductivity, such as copper, aluminum and other excellent conductive materials, to shield external high-frequency electromagnetic interference, and use the electromagnetic field to generate eddy current loss inside the shielding metal, converting the energy of electromagnetic interference into heat and dissipating it. Shielding layer 2 52 is made of materials with high magnetic permeability, such as silicon-iron alloy and other excellent magnetic conductive materials, to shield external low-frequency electromagnetic interference, and use the low magnetic resistance characteristics of high magnetic conductive materials to shunt the magnetic flux, preventing the external magnetic field from inducing the internal area of ​​shielding layer 2 52, so that the external magnetic field cannot enter the shielding layer 2 52, and plays a role in shielding low-frequency electromagnetic interference. The material of shielding layer 3 53 is the same as that of shielding layer 1 51, and is also made of materials with high conductivity, which can also shield high-frequency electromagnetic interference. Shielding layer 3 53 is not a simple repetition of shielding layer 1 51, but is necessary for its existence. Shielding layer three 53 has two important functions. First, it isolates the Rogowski coil from shielding layer two 52. Because shielding layer two 52 is made of high magnetic permeability material, if it is not effectively isolated, the magnetic flux that should flow through the Rogowski coil will enter the shielding layer two 52 in large quantities, greatly weakening the magnetic flux of the Rogowski coil, thereby making the working stability of the Rogowski coil worse; second, it supplements and strengthens the effect of shielding electromagnetic interference to prevent the external electromagnetic interference signal energy from being too large to saturate shielding layer one 51.

[0028] The fifth shield 6 is a combined shielding structure formed by two inner and outer shielding rings. First, the first function of the inner shielding ring is similar to that of the second shield 3, which is to uniformly form the electric field near the ceramic capacitor. The inner shielding ring of the fifth shield 6 is located at the lead-out line of the moving end of the arc extinguishing chamber and is fixed on the lead-out terminal of the moving end of the arc extinguishing chamber. The material is metal, and a copper braided mesh can be selected. Its function is to optimize the electric field at the lower end electronic voltage sensor, avoid electric field distortion near the lower end electronic voltage sensor, and ensure the insulation reliability of the sensor capacitor, especially the reliability of the surface insulation. The electronic voltage sensor adopts the principle of capacitor voltage division, and the lower end voltage sensor 104 adopts a high-voltage ceramic capacitor, whose high-voltage end is connected to the lower outlet conductive rod 101 through a copper lead, and its low-voltage end is connected to the outer shielding ring through bolts.

[0029] Secondly, the inner shielding ring and the outer shielding ring are combined into an electromagnetic shielding box structure. The outer edge of the outer shielding ring wraps the outer edge of the inner shielding ring inside its ring, reducing the gap of the shielding box and reducing the intrusion of external electromagnetic interference signals to affect the sensitivity and accuracy of the electronic voltage sensor. The shielding wire is welded at the bottom of the outer shielding ring, and the other end of the shielding wire is led to the low-voltage capacitor. The shielding wire uses high-temperature resistant Teflon shielding wire.

[0030] The sixth shield 7 is similar in structure and function to the fifth shield 6. The difference is that the copper lead of the sixth shield 7 is led from the static end of the arc extinguishing chamber, while the copper lead of the fifth shield 6 is led from the lower outgoing conductive rod 101 connected to the dynamic end of the arc extinguishing chamber. That is, the signals of the two protected electronic voltage sensors come from different sources, one comes from the static end of the arc extinguishing chamber, and the other comes from the dynamic end of the arc extinguishing chamber.

[0031] Further, such as Figure 2 and Figure 4-Figure 8 As shown, an annular sealing groove is provided on the lower side of the shell 1, and the circuit breaker box is provided with a protrusion 01 inserted into the annular sealing groove of the shell 1, and also includes: an outer sleeve 8, which is provided in the annular sealing groove of the shell 1; an inner sleeve 9, which is provided in the outer sleeve 8.

[0032] In the above solution, water or dust is prevented from entering the interior of the housing 1. The outer sleeve 8 and the inner sleeve 9 are both made of elastic materials, and the housing 1 and the protrusion 01 squeeze the outer sleeve 8 to achieve sealing of the device.

[0033] Further, such as Figure 4 and Figure 7 As shown, it also includes: a first slider 10, which has a plurality of them, the shell 1 is provided with first slide grooves 106 distributed at circumferential intervals, the number of the first slide grooves 106 is the same as the number of the first sliders 10, the first slider 10 is slidably connected in the adjacent first slide grooves 106, the shell 1 is provided with connecting grooves 107 distributed at circumferential intervals, the number of the connecting grooves 107 is the same as the number of the first sliders 10, the first slide grooves 106 are connected to the outer sleeve 8 through the adjacent connecting grooves 107, and the first slide grooves 106 are filled with gas.

[0034] In the above scheme, the purpose is to inject gas into the outer sleeve 8. A plurality of first sliders 10 are evenly distributed, and the gas in the first slide groove 106 has a certain pressure, so that the outer sleeve 8 expands and squeezes the shell 1 and the protrusion 01 to achieve sealing. When the shell 1 is connected to the circuit breaker box, the first slider 10 presses the gas in the first slide groove 106 into the outer sleeve 8, and the first slider 10 and the circuit breaker box squeeze each other.

[0035] Further, such as Figure 7 As shown, it also includes: second sliders 11, the number of which is the same as the number of first sliders 10, the shell 1 is provided with second slide grooves 108, the number of which is the same as the number of second sliders 11, the second sliders 11 are slidably connected to adjacent second slide grooves 108, a first spring is provided between the second slider 11 and the shell 1, the second slide groove 108 is connected to the adjacent connecting groove 107, and the second slider 11 is used to block the adjacent connecting groove 107.

[0036] In the above scheme, the gas in the first slide groove 106 is injected into the outer sleeve 8 after the housing 1 is installed on the circuit breaker box. The second slider 11 includes two cylinders with different diameters and a first disk. The first spring between the second slider 11 and the housing 1 is initially in a compressed state, which is used to make the second slider 11 resist the initial gas pressure in the first slide groove 106.

[0037] Further, such as Figure 7 As shown, it also includes: a limiting member 12, the number of which is the same as the number of the first sliders 10, which is slidably connected to the shell 1, and a second spring is arranged between the limiting member 12 and the shell 1, and the limiting member 12 is used to limit the adjacent first sliders 10.

[0038] In the above scheme, it is intended to prevent the gas in the outer sleeve 8 from returning to the first slide groove 106 during the use of the device. The lower side of the limiter 12 is provided with an inclined surface, and the first slider 10 presses the inclined surface of the limiter 12 when moving upward. After the larger diameter portion of the first slider 10 passes over the upper side of the limiter 12, the limiter 12 limits the first slider 10.

[0039] Further, such as Figure 2 and Figure 8 As shown, it also includes: a third slider 13, which has a plurality of circumferentially spaced distributions, the shell 1 is provided with third slide grooves 109 of the same number as the third slider 13, the third slider 13 is slidably connected to the adjacent third slide grooves 109, the third slide grooves 109 and the inner sleeve 9 are filled with liquid, a third spring is provided between the third slider 13 and the shell 1, the third slide groove 109 is connected to the inner sleeve 9 through a first pipe, and the first pipe of the third slide groove 109 penetrates the outer sleeve 8.

[0040] In the above scheme, it is intended to prevent the seal between the housing 1 and the protrusion 01 from failing after the bolts connecting the housing 1 and the circuit breaker box are loosened. A plurality of third sliders 13 are evenly distributed, and the third slider 13 is composed of a second disc and a round rod, and the round rod of the third slider 13 penetrates the housing 1 and presses against the circuit breaker box.

[0041] Further, such as Figure 6 As shown, it also includes: a plurality of support rings 14 distributed at circumferential intervals, all of which are fixed to the inner side of the inner sleeve 9.

[0042] In the above scheme, the shape of the outer side of the inner sleeve 9 when under pressure is maintained. The support ring 14 is fixed to the inner sleeve 9 only at three evenly distributed points, so that when the liquid in the inner sleeve 9 increases and expands, the part of the inner sleeve 9 not fixed to the support ring 14 can continue to expand, but when the inner sleeve 9 contracts, the contraction degree is reduced due to the support of the support ring 14.

[0043] Further, such as Figure 2 and Figure 5 As shown, it also includes: a fourth slider 15, which has a plurality of circumferentially spaced distributions, the shell 1 is provided with a fourth slide groove 110 whose number is the same as the number of the fourth slider 15, the fourth slider 15 is slidably connected to the adjacent fourth slide groove 110, the fourth slide groove 110 is filled with liquid, and the fourth slide groove 110 is connected to the inner sleeve 9 through a second pipe.

[0044] In the above scheme, the sealing between the housing 1 and the circuit breaker box is maintained when the device vibrates. There is a gap between the protrusion 01 and the side wall of the annular sealing groove on the lower side of the housing 1, so that the displacement generated by the housing 1 during vibration can squeeze the fourth slider 15, and there is friction between the fourth slider 15 and the housing 1, so that the fourth slider 15 will be delayed when it is reset.

[0045] Working process: When using the device, first connect the housing 1 to the circuit breaker box by bolts. When connecting, the first slider 10 and the third slider 13 first contact the circuit breaker box, and then stop moving. At this time, the housing 1 continues to move downward, and the first slider 10 and the third slider 13 move into the housing 1. The protrusion 01 on the circuit breaker box is gradually inserted into the annular sealing groove of the housing 1. The first slider 10 squeezes the gas in the first slide groove 106, and the air pressure in the first slide groove 106 increases. When the housing 1 is about to be connected to the circuit breaker box, the gas pushes the second slider 11 to move upward and compresses the adjacent third slider 11. A spring limiter, the second slider 11 releases the blockage of the connecting groove 107. At this time, the gas enters the outer sleeve 8 through the connecting groove 107, so that the outer sleeve 8 completes the sealing between the shell 1 and the protrusion 01. At the same time, the first slider 10 squeezes the limiter 12 to move, and the limiter 12 compresses the second spring adjacent to it. When the shell 1 contacts the circuit breaker box and stops moving, the limiter 12 is reset under the action of the adjacent second spring and locks the adjacent first slider 10. In the above process, the third slider 13 compresses the third spring and sucks the liquid in the inner sleeve 9 into the third slide groove 109.

[0046] As the use time increases, when the bolts connecting the shell 1 and the circuit breaker box are loosened, the third slider 13 moves downward under the action of the third spring, and presses the liquid in the third slide groove 109 into the inner sleeve 9. The inner sleeve 9 expands and squeezes the gas in the outer sleeve 8, causing the outer sleeve 8 to expand, thereby maintaining the pressure between the outer sleeve 8 and the shell 1 and the protrusion 01. When the shell 1 vibrates, the fourth slider 15 is blocked by the protrusion 01 and moves relative to the shell 1. At this time, the fourth slider 15 presses the liquid in the fourth slide groove 110 into the inner sleeve 9, thereby avoiding sealing failure when the shell 1 vibrates. When the shell 1 stops vibrating, under the action of the gas pressure in the outer sleeve 8, the liquid in the inner sleeve 9 is pressed into the fourth slide groove 110 to push the fourth slider 15 to reset.

[0047] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The scope of the present application is to be accorded the broadest interpretation so as to encompass all modifications and equivalent structures and functions.

Claims

1. A shielding structure for a sealed pole for a pole-mounted circuit breaker, characterized in that: Included are: A housing (1), wherein the housing (1) is provided with a lower outlet conductive rod (101), an energy extraction capacitor (102), an insulating pull rod (103), a lower end voltage sensor (104), and an upper end voltage sensor (105); A first shield (2) is arranged on the housing (1) and is fixedly connected to the lower outlet conductive rod (101); A second shield (3) is arranged on the housing (1) and on one side of the energy extraction capacitor (102); A third shield (4), arranged on the insulating pull rod (103); A fourth shield (5) is arranged on the housing (1) and sleeved on the outer side of the lower outlet conductive rod (101); a fifth shield (6), arranged on the housing (1) and wrapping the lower end voltage sensor (104); A sixth shield (7) is provided on the housing (1) and wraps the upper voltage sensor (105).

2. A shielding structure for a sealed pole for a pole-mounted circuit breaker according to claim 1, characterized in that: The first shield (2) and the second shield (3) are both shielding rings, the third shield (4) is a shielding cover, the fourth shield (5) is a sandwich-type electromagnetic shielding structure, and the fifth shield (6) and the sixth shield (7) are both combined shielding structures.

3. A shielding structure for a sealed pole for a pole-mounted circuit breaker according to claim 1, characterized in that: An annular sealing groove is provided on the lower side of the housing (1), and the circuit breaker box is provided with a protrusion (01) inserted into the annular sealing groove of the housing (1).

4. A shielding structure for a sealed pole for a pole mounted circuit breaker according to claim 3, characterized in that: Also included are: An outer sleeve (8) is arranged in the annular sealing groove of the housing (1); The inner sleeve (9) is arranged inside the outer sleeve (8).

5. A shielding structure for a sealed pole for a pole-mounted circuit breaker according to claim 4, characterized in that: Also included are: The first sliders (10) are provided with a plurality of first slide grooves (106) which are distributed at intervals in the circumferential direction, the number of the first slide grooves (106) is the same as the number of the first sliders (10), the first sliders (10) are slidably connected in adjacent first slide grooves (106), the shell (1) is provided with connecting grooves (107) which are distributed at intervals in the circumferential direction, the number of the connecting grooves (107) is the same as the number of the first sliders (10), the first slide grooves (106) are connected with the outer sleeve (8) through adjacent connecting grooves (107), and the first slide grooves (106) are filled with gas.

6. A shielding structure for a sealed pole for a pole mounted circuit breaker according to claim 5, characterized in that: Also included are: The number of the second sliders (11) is the same as the number of the first sliders (10); the housing (1) is provided with second slide grooves (108) the number of which is the same as the number of the second sliders (11); the second sliders (11) are slidably connected to adjacent second slide grooves (108); a first spring is provided between the second slider (11) and the housing (1); the second slide groove (108) is connected to an adjacent communicating groove (107); and the second slider (11) is used to block the adjacent communicating groove (107).

7. A shielding structure for a sealed pole for a pole mounted circuit breaker according to claim 6, characterized in that: Also included are: The limiting members (12) are equal in number to the first sliding blocks (10) and are slidably connected to the housing (1). A second spring is provided between the limiting member (12) and the housing (1). The limiting member (12) is used to limit the adjacent first sliding blocks (10).

8. A shielding structure for a sealed pole for a pole mounted circuit breaker according to claim 7, characterized in that: Also included are: The third slider (13) has a plurality of third slide grooves (109) distributed at circumferential intervals. The shell (1) is provided with a number of third slide grooves (109) equal to the number of the third sliders (13). The third slider (13) is slidably connected to adjacent third slide grooves (109). The third slide grooves (109) and the inner sleeve (9) are both filled with liquid. A third spring is provided between the third slider (13) and the shell (1). The third slide groove (109) is connected to the inner sleeve (9) via a first pipe. The first pipe of the third slide groove (109) penetrates the outer sleeve (8).

9. A shielding structure for a sealed pole for a pole-mounted circuit breaker according to claim 8, characterized in that: Also included are: A plurality of support rings (14) are distributed at circumferential intervals and are all fixedly connected to the inner side of the inner sleeve (9).

10. A shielding structure for a sealed pole for a pole mounted circuit breaker according to claim 9, characterized in that: Also included are: The fourth sliding blocks (15) are provided with a plurality of fourth sliding grooves (110) which are distributed at circumferential intervals. The housing (1) is provided with a fourth sliding groove (110) whose number is the same as the number of the fourth sliding blocks (15). The fourth sliding grooves (110) are slidably connected to adjacent fourth sliding grooves (110). Liquid is filled in the fourth sliding grooves (110). The fourth sliding grooves (110) are connected to the inner sleeve (9) via a second pipe.

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