Regulating mechanism for operating environment in SF6 ring main unit

Abstract

The invention belongs to the field of power ring main unit equipment and facilities, and provides an SF6 ring main unit internal operation environment adjusting mechanism, which comprises a secondary low-voltage chamber adjusting component and a cable chamber adjusting component, the secondary low-voltage chamber adjusting component comprises a rear cover, at least three groups of heat pipe assemblies, a transition pipe fitting, a bottom cover and a heat conduction piece, each heat pipe assembly comprises two evaporation pipes and one condensation pipe, the transition pipe fitting is used for introducing gas generated in the two evaporation pipes into the condensation pipe, the heat conduction piece comprises a heat conduction disc, one side of the heat conduction disc is provided with a heat conduction core column connected with the interiors of the evaporation pipes, and the other side of the heat conduction disc is provided with a plurality of contact pins; the cable chamber adjusting part comprises a cable winding roller, and the roller surface of the cable winding roller is used for dispersing and winding cables. According to the invention, the design is reasonable, no extra electric appliance is added, and especially no new air needs to be introduced into the secondary low-voltage chamber, so that dust cannot be attached to a bus device in a large area, heat dissipation is facilitated, the sealing performance is relatively good, the safety is relatively high, and the device is suitable for large-scale popularization.

Description

Technical Field

[0001] The present invention belongs to the field of power ring main switchgear equipment and facilities, and particularly relates to an operating environment adjusting mechanism in an SF6 ring main switchgear. Background Art

[0002] An SF6 ring main switchgear is a medium-voltage electrical combination device with air insulation or gas insulation that can be arbitrarily combined into multiple loop inlets and outlets, having functions of switching, connection, and protection of the power system, with a load switch as the core component. The upper and lower structures of the SF6 ring main switchgear mainly include three layers, such as a secondary low-voltage chamber, a switch chamber, and a cable chamber. The switchgear cabinet includes a fully enclosed stainless steel gas chamber and a mechanism chamber. The SF6 ring main switchgear adopts a ring network power supply method, connecting multiple power supply points into a ring network through the ring main switchgear, enabling power to be supplied to the load end from multiple directions, improving the reliability and flexibility of power supply. When a certain line or equipment fails, the power supply to the non-fault area can be quickly restored through the switching operation of the ring main switchgear. The core components, the SF6 load switch or circuit breaker, are used to realize the on-off control of the circuit. The load switch is mainly used for the on-off of the load current under normal conditions, while the circuit breaker can quickly cut off the circuit in case of faults such as short circuits to protect the safety of equipment and lines.

[0003] The existing patent CN201820783111.8 discloses a high-voltage switchgear operating environment adjusting device, including a base, a cabinet body, an operating body, a support plate, a fan, a switch turntable, a switch knob, a fixing plate, a spring, a connecting seat, and a wire wheel. This device uses the method of controlling the fan for ventilation. Although it blows out condensation and acidic dust to a certain extent, due to the air circulation, fresh air carrying dust from the outside will also be introduced while it is working. Some adheres to the fan blades, and some directly adheres to the inside of the cabinet body. Moreover, the SF6 ring main switchgear is different from the high-voltage switchgear. Especially, the middle stainless steel gas chamber needs to be fully sealed, and the structure and installation form of the operating environment adjusting device need to be adjusted according to the characteristics and conditions of its upper and lower structures.

[0004] The existing patent CN202022127787.1 discloses a new type of highly protected and sealed SF6 ring main switchgear, mainly including a secondary instrument chamber, a mechanism chamber panel, a lower cabinet door, a gas box, a mechanism chamber cabinet board, a cable chamber base, a heat dissipation pipe, a thin-walled pipe, a fan, and a compressor. This device has an isolation heat dissipation structure with good heat dissipation effect, thus delaying the service life of the ring main switchgear and its internal equipment. However, the added fan and compressor will significantly increase the noise of the equipment. Especially, the SF6 ring network system generally includes an incoming line cabinet and an outgoing line cabinet, and there are more cabinets in the high-voltage metering scenario. The added electrical appliances of this device will not only increase the energy consumption but also increase the heat generation of the system to a certain extent. Summary of the Invention

[0005] In view of the technical problems existing in the above-mentioned SF6 ring main unit, the present invention provides an operating environment adjusting mechanism inside an SF6 ring main unit with reasonable design, good heat dissipation, good sealing performance and high safety.

[0006] To achieve the above object, the technical solution adopted by the present invention is that an operating environment adjusting mechanism inside an SF6 ring main unit provided by the present invention includes a secondary low-voltage chamber adjusting component and a cable chamber adjusting component. The secondary low-voltage chamber adjusting component is arranged at the rear side of the secondary low-voltage chamber of the SF6 ring main unit. The secondary low-voltage chamber adjusting component includes a rear cover that is hermetically nested and matched with the secondary low-voltage chamber. At least three groups of heat pipe components are arranged at the rear side of the rear cover. Each heat pipe component includes two evaporation pipes and one condensation pipe. A set of transition pipe fittings is arranged at the top of the evaporation pipe and the condensation pipe. The transition pipe fittings are used to introduce the gases generated in the two evaporation pipes into the condensation pipe together. A bottom cover that is hermetically nested with all the heat pipe components is arranged at the bottom of the rear cover. Two rows of heat guide component through-holes are arranged at the front side of the rear cover. Heat guide components are arranged in the heat guide component through-holes. Each heat guide component includes a heat conducting disc. One side of the heat conducting disc is provided with a heat conducting core column connected to the inside of the evaporation pipe. The other side of the heat conducting disc is provided with a plurality of contact feet. The cable chamber adjusting component includes a cable reel. The cable reel is of a hollow structure and horizontally penetrates the left and right sides of the cable chamber of the SF6 ring main unit. The roller surface of the cable reel is used to disperse and wind the cable wires.

[0007] Preferably, the cable chamber adjusting component further includes a tensioning reel arranged above the cable reel. The diameter of the tensioning reel is smaller than that of the cable reel. The tensioning reel is of a hollow structure and horizontally penetrates the left and right sides of the cable chamber of the SF6 ring main unit. The tensioning reel is used to wind the cable wires in the reverse direction and control the tension of the cable wires.

[0008] Preferably, mounting sunk openings for installing the cable reel and the tensioning reel are arranged on both the left and right sides of the cable chamber.

[0009] Preferably, the cable reel includes two half reels that are butted left and right. Embedding grooves and sockets are arranged on the butting surfaces of the two half reels. One end of each half reel is provided with an end cover that is matched with the mounting sunk opening. A turning handle is arranged at the end of the end cover. An annular groove is arranged at the position of each half reel inside the cable chamber and close to the mounting sunk opening. A C-shaped positioning clamp is arranged in the annular groove.

[0010] Preferably, the turning handle includes three uniformly distributed U-shaped rods. The middle positions of the three U-shaped rods are welded to each other and their ends are welded to the end cover.

[0011] Preferably, the cross-sections of both the evaporation tube and the condensation tube are triangular structures, the apex directions of adjacent evaporation tubes and condensation tubes are opposite, a sintered metal fiber layer is provided on the inner wall of the evaporation tube, and the cross-section of the sintered metal fiber layer is an outer triangular and inner circular structure, and a condensation mesh is provided inside the condensation tube.

[0012] Preferably, the transition pipe fitting includes three top covers corresponding to the evaporation tube and the condensation tube one by one, a T-shaped communication pipe is provided on the top cover, the T-shaped communication pipe includes two gas-lifting sections corresponding to the evaporation tube, and a pressure drop section is provided between the two gas-lifting sections, and the diameter of the pressure drop section gradually decreases from top to bottom.

[0013] Preferably, a support groove nested with the evaporation tube and the condensation tube is provided on the bottom cover, adjacent support grooves communicate with each other, a positioning core column nested with the center of the evaporation tube is provided in the support groove, and a communication port communicating with the support groove is provided at the bottom of the evaporation tube and the condensation tube.

[0014] Preferably, a heat contact plate is provided on the front side of the rear cover, the thickness of the heat contact plate is less than the length of the contact foot, the heat contact plate is used to connect different heat conduction components, the heat contact plate includes two flange sections, and an intermediate section is provided between the flange sections, and a support section for supporting and cooperating with the rear cover is provided on the rear side of the intermediate section.

[0015] Preferably, a plurality of fins arranged in sequence are provided on the top of the secondary low-voltage chamber, two rows of heat dissipation windows distributed left and right are provided on the front surface of the cable chamber, and a plurality of air holes are provided on the heat dissipation windows.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0017] An operating environment adjusting mechanism in an SF6 ring main unit provided by the present invention installs a secondary low-voltage chamber adjusting component at the rear side of the secondary low-voltage chamber, uses a heat conduction component to contact the bus device in the secondary low-voltage chamber and transfer heat to the heat pipe assembly, and the heat pipe assembly filled with a phase change material can perform cyclic heat dissipation; a cable chamber adjusting component is installed in the cable chamber, and the cable can be unwound in an axially spiral winding manner by the cable reel, and the hollow design of the cable reel is beneficial to promoting heat exchange with air. The device is reasonably designed and does not add additional electrical appliances. In particular, the secondary low-voltage chamber does not need to introduce new air, so the bus device will not be attached with dust on a large area, which is convenient for heat dissipation, has good sealing performance and high safety, and is suitable for large-scale popularization. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a three-dimensional view of an operating environment adjustment mechanism in an SF6 ring main unit and the SF6 ring main unit;

[0020] Figure 2 It is a front view of an operating environment adjustment mechanism in an SF6 ring main unit and the SF6 ring main unit;

[0021] Figure 3 It is a side view of an operating environment adjustment mechanism in an SF6 ring main unit and the SF6 ring main unit;

[0022] Figure 4 It is an axonometric view of an operating environment adjustment mechanism in an SF6 ring main unit and the SF6 ring main unit;

[0023] Figure 5 It is a three-dimensional view of the secondary low-voltage chamber adjustment component provided by the embodiment;

[0024] Figure 6 It is an exploded view of the secondary low-voltage chamber adjustment component provided by the embodiment;

[0025] Figure 7 It is a rear view of the secondary low-voltage chamber adjustment component provided by the embodiment;

[0026] Figure 8 It is a front view of the secondary low-voltage chamber adjustment component provided by the embodiment;

[0027] Figure 9 For Figure 8 The sectional view of the secondary low-voltage chamber adjustment component in the G-G direction in

[0028] Figure 10 For Figure 3 The sectional view of an operating environment adjustment mechanism in an SF6 ring main unit and the SF6 ring main unit in the E-E direction in

[0029] Figure 11 It is an exploded view of the cable reel provided by the embodiment;

[0030] Figure 12 It is a schematic diagram of the distribution of the cable on the cable reel;

[0031] In the above figures:

[0032] 1. Secondary low-voltage chamber adjustment component; 11. Rear cover; 12. Heat pipe assembly; 121. Evaporation pipe; 122. Condensation pipe; 123. Sintered metal fiber layer; 124. Condensation mesh; 125. Communication port; 13. Transition pipe fitting; 131. Top cover; 132. T-shaped communication pipe; 1321. Gas-lifting section; 1322. Pressure-drop section; 14. Bottom cover; 141. Support groove; 142. Positioning core column; 15. Heat conduction component; 151. Heat conduction plate; 152. Heat conduction core column; 153. Contact foot; 16. Heat contact plate; 161. Flange section; 162. Intermediate section; 163. Support section; 2. Cable chamber adjustment component; 21. Cable reel; 211. Half reel; 212. Embedded groove; 213. Sleeve opening; 214. End cover; 215. Rotating handle; 2151. U-shaped rod; 216. Ring groove; 217. C-shaped positioning clamp; 22. Tensioning reel; 3. Cable; 4. Secondary low-voltage chamber; 41. Fins; 5. Switch chamber; 6. Stainless steel gas chamber; 7. Cable chamber; 71. Installation sunk opening; 72. Heat dissipation window. Detailed implementation mode

[0033] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other. For the convenience of narration, the words such as "upper", "lower", "left" and "right" hereinafter only represent the same directions as the upper, lower, left and right directions of the accompanying drawings themselves, and do not limit the structure.

[0034] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed in the following specification.

[0035] Embodiment, such as Figures 1-12As shown in the figure, the SF6 ring main unit includes a secondary low-voltage chamber, a switch chamber, and a cable chamber from top to bottom. The stainless-steel gas chamber is arranged at the rear side of the switch chamber and forms a fully sealed gas-filled insulation design with it. Therefore, an operating environment adjustment mechanism in the SF6 ring main unit provided by the present invention is mainly installed in the secondary low-voltage chamber and the cable chamber. Specifically, it includes a secondary low-voltage chamber adjustment component 1 and a cable chamber adjustment component 2. More specifically, the secondary low-voltage chamber adjustment component 1 is arranged at the rear side of the secondary low-voltage chamber 4 of the SF6 ring main unit. The secondary low-voltage chamber adjustment component 1 includes a rear cover 11 that is hermetically nested and fitted with the secondary low-voltage chamber 4. At least 3 groups of heat pipe assemblies 12 are arranged at the rear side of the rear cover 11. The heat pipe assembly 12 includes 2 evaporation pipes 121 and 1 condensation pipe 122. A set of transition pipe fittings 13 is arranged at the top of the evaporation pipe 121 and the condensation pipe 122. The transition pipe fittings 13 are used to introduce the gas generated in the 2 evaporation pipes 121 into the condensation pipe 122 together. A bottom cover 14 that is hermetically nested with all the heat pipe assemblies 12 is arranged at the bottom of the rear cover 11. Two rows of heat conduction component through-holes are arranged at the front side of the rear cover 11. A heat conduction component 15 is arranged in the heat conduction component through-holes. The heat conduction component 15 includes a heat conduction disk 151. One side of the heat conduction disk 151 is provided with a heat conduction core column 152 connected to the inside of the evaporation pipe 121. The other side of the heat conduction disk 151 is provided with a plurality of contact feet 153; the cable chamber adjustment component 2 includes a cable reel 21. The cable reel 21 is of a hollow structure and horizontally penetrates the left and right sides of the cable chamber 7 of the SF6 ring main unit. The roller surface of the cable reel 21 is used to disperse and wind the cable 3.

[0036] In this device, the secondary low-voltage chamber adjustment component 1 is nested and installed at the rear side of the secondary low-voltage chamber 4. Clamping protrusions that can be clamped with the inner wall of the secondary low-voltage chamber 4 are arranged on both sides of the rear cover 11 of the secondary low-voltage chamber adjustment component 1. A clamping strip that can be clamped on the outer wall of the secondary low-voltage chamber 4 is arranged at the bottom edge of the rear cover 11. Regarding the working principle of the secondary low-voltage chamber adjustment component 1, the heat conduction component 15 contacts the busbar device in the secondary low-voltage chamber 4. In particular, its contact feet 153 can directly contact the busbar device and avoid the positions on the busbar device where there may be conductive structures, so as to avoid electrical connection and short circuit. Heat is evenly transferred from the heat conduction disk 151 to the heat conduction core column 152, and then directly transferred from the heat conduction core column 152 to the heat pipe assembly 12; a phase change material is filled in the evaporation pipe 121 of the heat pipe assembly 12. The phase change material can change from a liquid state to a gaseous state as the temperature rises and is transferred upward in a capillary transfer manner until the generated gas enters the condensation pipe 122 through the transition pipe fittings 13. The gaseous phase change material is condensed in the condensation pipe 122 and is distributed to the bottom of the corresponding evaporation pipe 121 through the aggregation effect of the bottom cover 14. Therefore, the heat pipe assembly 12 can achieve cyclic heat dissipation.

[0037] Furthermore, a cable chamber adjusting component 2 is installed in the cable chamber 7 of the SF6 ring main unit. The cable can be unrolled in an axially helical winding manner by the cable reel 21, instead of being bundled into a roll with a rope and hung in the cable chamber 7. Coupled with the hollow design of the cable reel 21, it is conducive to promoting heat exchange with the air. From this perspective, the design of this device is reasonable, without adding additional electrical appliances and without new energy consumption. In particular, the secondary low-voltage chamber 4 does not need to introduce new air, so it will not cause a large area of dust adhesion to the busbar devices, facilitating heat dissipation, ensuring good sealing performance, and improving the safety of equipment operation.

[0038] To improve the wiring stability of the cable 3 in the cable chamber 7, in addition to the cable reel 21, the cable chamber adjusting component 2 provided by the present invention further includes a tensioning reel 22 disposed above the cable reel 21. The diameter of the tensioning reel 22 is smaller than that of the cable reel 21. The tensioning reel 22 is of a hollow structure and transversely penetrates the left and right sides of the cable chamber 7 of the SF6 ring main unit. The tensioning reel 22 is used to wind the cable 3 in the reverse direction and control the tension of the cable 3. After the cable 3 is led out from the cable reel 21, it can pass along the tensioning reel 22 in the reverse direction and then be connected to the cable joint / plug, thereby ensuring the connection reliability of the cable 3. At the same time, the tensioning reel 22 also adopts a hollow design, which is also conducive to promoting heat exchange between the cable 3 and the air in the environment, ensuring that the cable works under conditions not significantly higher than the indoor or outdoor environmental temperature.

[0039] Considering that the SF6 ring network system generally has at least two SF6 ring main units arranged side by side, in order not to affect the left-right side-by-side installation, mounting recesses 71 for installing the cable reel 21 and the tensioning reel 22 are provided on both the left and right sides of the cable chamber 7 provided by the present invention. The mounting recesses 71 penetrate the interior of the cable chamber 7, and the cable reel 21 and the tensioning reel 22 are concealed and inserted into the mounting recesses 71. In this way, it can not only ensure that there is space for air to pass through the hollow positions of the cable reel 21 and the tensioning reel 22, but also does not affect the side-by-side installation of multiple cabinets.

[0040] In order to facilitate the installation of the cable 3 and taking into account the installation limitations of the cable reel 21, the cable reel 21 provided by the present invention includes two semi-reels 211 that are butted left and right. The two semi-reels 211 are provided with a groove 212 and a socket 213 on their butting surfaces. One end of the semi-reel 211 is provided with an end cap 214 that cooperates with the installation sunk opening 71. The end of the end cap 214 is provided with a turning handle 215. The semi-reel 211 is provided with an annular groove 216 at a position inside the cable chamber 7 and close to the installation sunk opening 71. A C-shaped positioning clamp 217 is arranged in the annular groove 216. In this way, the two semi-reels 211 can be inserted into the cable chamber 7 from two directions by means of left-right plugging. Its roller body and end cap 214 can seal the edge of the installation sunk opening 71, and the cable 3 can be sleeved on one of the semi-reels 211 before the two semi-reels 211 are completely butted. After the two semi-reels 211 are butted, the roller body for the cable 3 to be scattered and coiled can be built; the C-shaped positioning clamp 217 is stuck in the annular groove 216, so as to prevent the two semi-reels 211 on the left and right from freely moving, so as to ensure the connection reliability of the cable 3 in the SF6 ring main unit.

[0041] Furthermore, the end of the cable reel 21 is designed with a turning handle 215, which is convenient for the staff to reasonably adjust the tension and working length of the cable 3. The turning handle 215 includes three uniformly distributed U-shaped rods 2151. The middle positions of the three U-shaped rods are welded to each other and their ends are welded to the end cap 214. In this way, the turning handle 215 neither affects the passage of air through the hollow position of the cable reel 21 nor affects the manual adjustment of the rotation angle of the cable reel 21. It should be noted that the cable reel 21 and the side wall of the cable chamber 7 are in transitional fit, and there is a certain frictional force between them. It will not rotate freely without the application of human force and large interference forces. Therefore, it can be ensured that the cable 3 will not be randomly lengthened and shortened after the established adjustment.

[0042] In order to improve the heat dissipation performance of the heat pipe assembly 12, the cross-sections of the evaporation pipe 121 and the condensation pipe 122 provided by the present invention are both triangular structures. The vertex angles of adjacent evaporation pipes 121 and condensation pipes 122 are in opposite directions. A sintered metal fiber layer 123 is provided on the inner wall of the evaporation pipe 121, and the cross-section of the sintered metal fiber layer 123 is in the structure of an outer triangle and an inner circle. A condensation mesh 124 is provided inside the condensation pipe 122. Among them, both the evaporation pipe 121 and the condensation pipe 122 adopt the design of triangular prisms, which can make full use of the rear space of the rear cover 11, better coordinate the positional relationship of different groups of heat pipe assemblies 12 in terms of space, and the grouped heat pipe assemblies 12 integrate the two functions of evaporation and condensation. Further, the sintered metal fiber layer 123 forms a capillary structure capable of densely filling the phase change material. The design of its inner circle ensures that the outer membrane wall of the phase change material remains relatively unified and smooth, and the gas undergoing phase change due to heat can move upward better into the transition pipe fitting 13. The condensation mesh 124 is used to condense the gaseous phase change material, and the condensation mesh 124 and the outer wall of the condensation pipe 122 complete heat exchange with the external air, thereby better completing the heat exchange process.

[0043] In order to improve the circulation efficiency of the phase change material, the transition pipe fitting 13 provided by the present invention includes 3 top covers 131 corresponding to the evaporation pipe 121 and the condensation pipe 122 one by one. A triangular sealing gasket matching the inner walls of the evaporation pipe 121 and the condensation pipe 122 is provided on the side surface of the top cover 131. A T-shaped communication pipe 132 is provided on the top cover 131. The T-shaped communication pipe 132 includes two gas-lifting sections 1321 corresponding to the evaporation pipe 121. A pressure drop section 1322 is provided between the two gas-lifting sections 1321, and the diameter of the pressure drop section 1322 gradually decreases from top to bottom. In this way, the 2 evaporation pipes 121 absorb heat from different positions respectively and complete the phase change process inside the evaporation pipes 121, shortening the heat dissipation time. The gaseous media generated in the 2 evaporation pipes 121 can enter 1 pressure drop section 1322, providing thrust to the gas in the pressure drop section 1322, promoting the gas in the pressure drop section 1322 to enter the working range of the condensation mesh 124 downward, so as to complete the change from gas phase to liquid phase.

[0044] In order to improve the uniform distribution of the phase change material in the liquid phase into different heat pipe assemblies 12, a support groove 141 nested with the evaporation pipe 121 and the condensation pipe 122 is provided on the bottom cover 14 provided by the present invention. Adjacent support grooves 141 communicate with each other. A positioning core column 142 nested with the center of the evaporation pipe 121 is provided in the support groove 141. Communication ports 125 communicating with the support groove 141 are provided at the bottoms of the evaporation pipe 121 and the condensation pipe 122. In this way, while the bottom cover 14 seals all the heat pipe assemblies 12, conditions for the flow of the liquid phase medium are also established inside it, which is beneficial to the distribution of the phase change material into the corresponding evaporation pipe 121 for the subsequent cycle heat dissipation process. The positioning core column 142 not only plays a positioning role but also can promote the liquid phase material to bypass its side wall and directly penetrate into the sintered metal fiber layer 123, playing a certain pressurizing role and being beneficial to the liquid phase material entering the capillary stroke.

[0045] Considering that the metal contact density behind some bus devices in the secondary low-pressure chamber 4 is relatively low, and in order to improve the heat conduction efficiency between them and the secondary low-pressure chamber adjusting component 1, a heat contact plate 16 is provided on the front side of the rear cover 11 provided by the present invention. The thickness of the heat contact plate 16 is less than the length of the contact foot 153. The heat contact plate 16 is used to connect different heat conduction components 15. The heat contact plate 16 includes two flange segments 161, and an intermediate segment 162 is provided between the flange segments 161. A support segment 163 that is supported and cooperates with the rear cover 11 is provided on the rear side of the intermediate segment 162. The support segment 163 is used to ensure the stability of the heat contact plate 16 and avoid excessive heat transfer to the rear cover 11. In this way, the contact feet 153 of the heat conduction component 15 avoid the metal contacts of the bus device, and the heat contact plate 16 can be directly attached to the bus device and the wiring frame of the bus device, and the installation angle of the heat contact plate 16 can be flexibly selected to be installed on different heat conduction components 15, thereby increasing the contact area between the bus device in the secondary low-pressure chamber 4 and the secondary low-pressure chamber adjusting component 1, being beneficial to improving the circulation efficiency of the phase change material in the heat pipe assembly 12, and thus improving the adjustment performance of the device for the operating environment in the SF6 ring main unit.

[0046] In order to improve the heat dissipation performance of the SF6 ring main unit, a plurality of fins 41 arranged in sequence are provided on the top of the secondary low-pressure chamber 4 provided by the present invention. Two columns of heat dissipation windows 72 distributed left and right are provided on the front of the cable chamber 7. A plurality of air holes are provided on the heat dissipation windows 72. The fins 41 receive the heat from the secondary low-pressure chamber 4 by means of metal heat conduction, and they are in contact with the environment itself and can exchange heat with the installation environment of the SF6 ring main unit. Since the dust requirement level of the cable chamber 7 is much lower than that of the secondary low-pressure chamber 4 and the switch chamber, the heat dissipation windows 72 can be used to directly exchange air in the cable chamber 7, thereby dissipating heat from the cable to a certain extent, and the heat dissipation windows 72 can adopt a relatively large opening mesh number, thereby realizing the function of filtering dust in the air.

[0047] As described above, it is only the preferred embodiment of the present invention, and it is not intended to limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An operating environment adjustment mechanism in a SF6 ring main unit, comprising a secondary low-voltage chamber adjustment component and a cable chamber adjustment component, characterized in that: The secondary low-pressure chamber regulating component is arranged at the rear side of the secondary low-pressure chamber of the SF6 ring network cabinet, and the secondary low-pressure chamber regulating component includes a rear cover which is sealed and nested with the secondary low-pressure chamber, and at least three groups of heat pipe assemblies are arranged on the rear side of the rear cover, and the heat pipe assembly includes two evaporating tubes and one condensing tube, and a set of transition pipes are arranged on the top of the evaporating tube and the condensing tube, and the transition pipes are used to introduce the gas generated in the two evaporating tubes into the condensing tube together, and a bottom cover which is sealed and nested with all the heat pipe assemblies is arranged at the bottom of the rear cover, and two rows of heat conducting member through-holes are arranged on the front side of the rear cover, and a heat conducting member is arranged in the heat conducting member through-holes, and the heat conducting member includes a heat conducting plate, and a heat conducting core column connected to the inside of the evaporating tube is arranged on one side of the heat conducting plate, and a plurality of contact pins are arranged on the other side of the heat conducting plate; The cable chamber adjustment component includes a cable roller, which is a hollow structure and transversely penetrates the left and right sides of the cable chamber of the SF6 ring network cabinet. The roller surface of the cable roller is used to disperse the wound cable wires.

2. The operating environment regulating mechanism in the SF6 ring main unit according to claim 1 is characterized in that: The cable chamber adjustment component also includes a tensioning roller arranged above the cable roller. The diameter of the tensioning roller is smaller than the diameter of the cable roller. The tensioning roller is a hollow structure and it laterally penetrates the left and right sides of the cable chamber of the SF6 ring network cabinet. The tensioning roller is used to reversely wind the cable and control the tension of the cable.

3. The operating environment regulating mechanism in the SF6 ring main unit according to claim 2 is characterized in that: The left and right sides of the cable chamber are both provided with mounting countersunk openings for mounting the cable reel and the tension reel.

4. The operating environment regulating mechanism in the SF6 ring main unit according to claim 3 is characterized in that: The cable reel includes two half-rollers butted against each other on the left and right, and the two half-rollers are provided with embedding grooves and sleeves on their butt surfaces. One end of the half-roller is provided with an end cover that cooperates with the mounting countersunk, and the end of the end cover is provided with a turning handle. The half-roller is provided with an annular groove at a position located inside the cable chamber and close to the mounting countersunk, and a C-shaped positioning clamp is provided in the annular groove.

5. The operating environment regulating mechanism in the SF6 ring main unit according to claim 4 is characterized in that: The turning handle comprises three evenly distributed U-shaped rods, the middle positions of the three U-shaped rods are welded to each other and the ends thereof are welded to the end covers.

6. The operating environment regulating mechanism in the SF6 ring main unit according to claim 1 or 5, characterized in that: The cross-sections of the evaporator tube and the condenser tube are both triangular structures, the vertex angles of adjacent evaporator tubes and condenser tubes are in opposite directions, the inner wall of the evaporator tube is provided with a sintered metal fiber layer, the cross-section of the sintered metal fiber layer is an outer triangular inner circular structure, and a condensation net is provided inside the condenser tube.

7. The operating environment regulating mechanism in the SF6 ring main unit according to claim 6 is characterized in that: The transition pipe comprises three top covers corresponding to the evaporating tubes and the condensing tubes one by one, the top covers are provided with T-shaped connecting pipes, the T-shaped connecting pipes comprise two air-raising sections connected to the evaporating tubes, a pressure-dropping section is provided between the two air-raising sections, and the diameter of the pressure-dropping section gradually decreases from top to bottom.

8. The operating environment regulating mechanism in the SF6 ring main unit according to claim 1 is characterized in that: The bottom cover is provided with a supporting groove nested with the evaporating tube and the condensing tube, and adjacent supporting grooves are connected to each other. A positioning core column nested with the center of the evaporating tube is provided in the supporting groove, and a connecting port connected to the supporting groove is provided at the bottom of the evaporating tube and the condensing tube.

9. The operating environment regulating mechanism in the SF6 ring main unit according to claim 1 is characterized in that: A thermal contact plate is provided on the front side of the rear cover, the thickness of the thermal contact plate is smaller than the length of the contact pin, the thermal contact plate is used to connect different thermal conductors, the thermal contact plate includes two flange sections, an intermediate section is provided between the flange sections, and a support section cooperating with the rear cover support is provided on the rear side of the intermediate section.

10. The operating environment regulating mechanism in the SF6 ring main unit according to claim 1 is characterized in that: The top of the secondary low-pressure chamber is provided with a plurality of fins arranged in sequence, and the front of the cable chamber is provided with two rows of heat dissipation windows distributed left and right, and the heat dissipation windows are provided with a plurality of air holes.

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