Solid insulation ring main unit

Abstract

The invention relates to the technical field of ring main units, in particular to a solid insulation ring main unit which comprises a bus chamber, an instrument chamber, an operating mechanism chamber, a cable chamber, a pole chamber, a cooling fan, a first sliding rail, a second sliding rail, a solid-sealed pole, a gas rod, a locking module and a bolt. The first sliding rail and the second sliding rail are installed in the pole chamber in a two-to-two diagonal mode, the solid-sealed pole is provided with a sliding groove and an air channel, a threaded hole is formed in the sliding groove connected with the second sliding rail in a clamped mode and connected with the air channel, the air rod is installed in the first sliding rail, the locking module is arranged between the air rod and the sliding groove, and the locking module is connected with the air rod. According to the invention, the sliding rails are installed in advance to position and fix a plurality of solid-sealed polar poles at the same time, and heat exchange pipelines of a plurality of solid insulation ring main units are communicated through the sliding rails, so that the purposes of simple installation of the solid-sealed polar poles and consideration of heat dissipation and insulation of the solid-sealed polar poles are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ring main unit, in particular to a solid insulation ring main unit. Background Art

[0002] Ring main unit is a switchgear used in high-voltage power supply systems. In order to ensure the stability and reliability of power supply, users (such as residential areas, industrial and mining enterprises, etc.) can usually obtain power from two directions. When a circuit in one direction fails, the power supply in the other direction can ensure normal power supply. The two power supplies are usually provided by a distribution station. The two busbars are connected from two power sources of the power supply station and connected to the user. The two busbars supply power to the user's sub-circuits at the same time, and corresponding power supply conversion occurs when a fault occurs. The ring power supply system composed of busbars and sub-lines is called ring network power supply, and the equipment used to connect and control busbars and sub-lines is called ring main unit.

[0003] Similar to the circuit breakers commonly seen in life, the ring main unit will also generate arcs when breaking the circuit. Because the voltage of the ring main unit circuit is often above 10KV and the current is often above 2000A, the arc generated has extremely high energy, so a special arc extinguishing chamber is required. In addition, a series of electrical equipment such as disconnectors and circuit breakers are also required. In order to ensure the external insulation of these electrical equipment and avoid discharge breakdown between them, they are often assembled in a confined space and passed with high-voltage insulating gas, such as sulfur hexafluoride. This is the common gas insulated ring main unit. Since the insulation of gas is limited, the insulation is often ensured by increasing the capacity of insulating gas. Therefore, the gas insulated ring network cabinet is overall bloated, which is not conducive to transportation. When used in high-altitude areas, the sealing of the insulating gas is further challenged. In order to solve the above problems, solid insulated ring network cabinets came into being. Solid insulated ring network cabinets use epoxy resin instead of insulating gas, and integrate the above-mentioned arc extinguishing chambers, disconnectors, circuit breakers and other electrical appliances into solid-sealed poles through the injection molding process, thereby greatly improving the external insulation capacity of various electrical appliances and effectively reducing the volume of the ring network cabinet.

[0004] However, when solid insulated ring main units are used in high altitude areas, the following problems still exist:

[0005] 1. In high-altitude areas, the sealed poles are usually installed on-site because of the complex road conditions in high-altitude areas. During transportation, in order to avoid damage to the internal structure of the sealed poles due to bumps, the sealed poles are often transported separately and installed after the performance of the sealed poles is tested on-site. Each solid-insulated ring network cabinet needs to be installed with at least three sealed poles. During installation, the sealed poles are connected to the frame through several flanges on the sealed poles, and each flange needs to be connected with several bolts. In addition, the on-site working conditions are limited and affected by various variables. If the conventional bolt locking method is used, the efficiency of the on-site operation will be significantly affected;

[0006] 2. With the increase of altitude, in order to avoid discharge, further requirements are put forward for the external insulation capacity of the sealed pole. The existing technology often sticks an insulating sleeve or increases the amount of epoxy resin to increase the thickness of the sealed pole. However, at the same time, the heat dissipation performance of the sealed pole is also declining, and the life of its internal seal will be seriously affected.

[0007] In order to solve the problem of inconvenience in installing sealed poles in high altitude areas and the conflict between insulation and heat dissipation of sealed poles, a solid insulation ring main unit is proposed. Summary of the invention

[0008] The object of the present invention is to provide a solid insulation ring network cabinet, which solves the problem that the solid-sealed poles are inconvenient to install and the conflict between insulation and heat dissipation. By pre-installing slide rails to simultaneously position and fix multiple solid-sealed poles, and connecting the heat exchange pipes of multiple solid insulation ring network cabinets through slide rails, the purpose of simply installing the solid-sealed poles is achieved while taking into account the heat dissipation and insulation of the solid-sealed poles.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A solid insulated ring network cabinet, comprising a busbar room, an instrument room, an operating mechanism room, a cable room and a pole room, and also comprising a cooling fan, a first slide rail, a second slide rail, a sealed pole, a gas rod, a locking module and a bolt, wherein the cooling fan is installed in the cable room, the first slide rail and the second slide rail are both installed in the pole room, and the first slide rail and the second slide rail are arranged diagonally in pairs, the sealed pole is provided with a slide groove and an air duct, the four slide grooves are respectively engaged with the first slide rail and the second slide rail, and the slide groove engaged with the second slide rail is provided with a threaded hole, the threaded hole is connected to the air duct, the gas rod is installed in the first slide rail, the locking module is arranged between the gas rod and the slide groove, the bolt is placed in the locking module, the gas rod and the bolt are both hollow inside, and the cooling fan is connected to the front ports of the two gas rods respectively;

[0011] The sealed pole slides under the guidance of the first slide rail and the second slide rail on the slide groove, the screw end of the bolt is inserted into the threaded hole to position the sealed pole, and the multiple locking modules driven by the rotation of the gas rod synchronously lock the bolts to fix the sealed pole, and the air ducts of multiple solid insulation ring network cabinets are connected by the engagement of the front end and the rear end of the gas rod.

[0012] In the prior art, for fixing the sealed pole, flanges are usually arranged at the two outlets of the sealed pole, and the sealed pole is fixed by connecting the flanges with the chamber partition. This fixing method has the following problems: 1. For the convenience of transportation, production and replacement, the sealed poles are usually manufactured independently, so each sealed pole must be fixed separately, which will increase the workload of on-site operations. In addition, due to the weight and shape of the sealed poles, it is difficult for a single person to fix the sealed poles while keeping them in position by tightening the bolts. The sealed poles are high-cost, highly sensitive integrated structures, and collisions during installation should be avoided as much as possible. 2. The sealed poles have high-voltage and high-current circuits, which will generate high-frequency vibrations during operation. The fixed poles are not reliable if they are only connected by two flanges. If additional connections are added to improve the reliability of fixation, the above-mentioned problem 1 will be further aggravated.

[0013] Preferably, the locking module includes a main tooth, a slave tooth, a shaft bin, a suction plate, a spring and a limiter, the main tooth and the slave tooth are bevel gears, the main tooth is installed on the gas rod, the slave tooth is meshed below the main tooth, and the slave tooth is hollow inside, the shaft bin is located below the slave tooth, and the shaft bin is rotatably connected to the first slide rail, the inner contour of the shaft bin is a regular hexagon, the suction plate is clamped inside the shaft bin, and the suction plate is set to a regular hexagonal prism structure, the suction plate is made of permanent magnet material, the spring is arranged between the suction plate and the bottom wall of the shaft bin, the limiter is connected above the suction plate, and the limiter is hollow inside;

[0014] Through the above scheme, reliable fixation is achieved by means of locking of the bolts and the threaded holes, and the tightness of the gas circulation is ensured by the tightness of the threaded connection.

[0015] The bolt can slide axially through the spiral in the threaded hole. If the axial force is directly applied to the bolt, the thread of the bolt will interfere with the thread of the threaded hole to prevent axial sliding. Based on this principle, the bolt can only extend the chamfered part of its screw end into the threaded hole. However, if this is done, the combined part of the bolt and the threaded hole will be reduced, which will affect the reliability of the positioning of the sealed pole.

[0016] Preferably, a light segment is provided at the screw end of the bolt, no thread is provided on the circumference of the light segment, and the light segment is provided in a conical structure;

[0017] Through the above solution, the length of the bolt inserted into the threaded hole is guaranteed by means of the optical segment, thereby improving the reliability of positioning the sealed pole, and further, through the tapered structure of the optical segment, the bolt is easier to insert into the threaded hole.

[0018] The bolt is guided in and out of the threaded hole only by the conical circumference of the optical segment, and the guiding effect is limited. The sliding of the sealed pole on the first slide rail will encounter greater resistance. In addition, during the above process, the bolt is subjected to more radial force, which will cause inclination, thereby affecting the concentricity of the bolt and the threaded hole, resulting in the bolt being unable to be screwed into the threaded hole during the subsequent tightening process.

[0019] Preferably, the slide groove engaged with the first slide rail is provided with an introduction slope and an extraction slope, the introduction slope and the extraction slope are respectively arranged at the rear and the front of the threaded hole, the introduction slope passes through the outer contour of the sealed pole, the extraction slope is connected to the front and rear symmetrical surfaces of the threaded hole, and the lowest ends of the introduction slope and the extraction slope are both located below the naturally drooping bolt;

[0020] Through the above scheme, the arrangement of the introduction bevel and the lead-out bevel, on the one hand, reduces the resistance of the sealed pole to sliding on the slide rail, and on the other hand, generates a component force along the axial direction of the bolt on the conical circumference of the light section to reduce the radial force on the bolt during the sliding process, thereby weakening the inclination of the bolt to ensure the normal progress of the locking process.

[0021] Although the lead-out inclined surface reduces the resistance of the bolt sliding out of the threaded hole, it also makes it easier for the bolt to separate from the threaded hole, thereby weakening the positioning effect on the sealed pole;

[0022] Preferably, the first slide rail and the second slide rail are both arranged obliquely in the pole chamber from a right-side viewing angle, and the first slide rail and the second slide rail both have a lower front end and a higher rear end;

[0023] Through the above solution, the sealed pole has a tendency to move from back to front along the slide rail under the action of its own gravity, so that the bolt is close to the threaded hole, thereby ensuring the reliability of the positioning of the sealed pole and ensuring the normal progress of the subsequent locking process.

[0024] The arc extinguishing chamber has high voltage and high current lines passing through it, so the outer shell that wraps the arc extinguishing chamber is more susceptible to discharge breakdown.

[0025] Preferably, some of the sealed poles with slide grooves are configured as cylindrical structures, and the cross-section of the air passage is configured as a circle;

[0026] Through the above scheme, the cylindrical structure wraps the arc extinguishing chamber, making the external electric field distribution of the arc extinguishing chamber more uniform, thereby effectively reducing the risk of discharge breakdown; in addition, the cylindrical structure forms an arc-shaped port in the slide groove, making it easier for the slide rail to enter the slide groove, thereby improving the installation efficiency of the sealed pole.

[0027] The rotation of the gas rod requires external force, and the premise of force application is that the force-applying tool and the inner rod are reliably combined. There are many ways to achieve this combination, such as spline connection. Correspondingly, there are many ways to arrange the spline. For example, the end of the gas rod extends out of the first guide rail, and then a spline structure is arranged on the outer circumference of the extended gas rod. For another example, the end of the gas rod is inside the first guide rail, and the spline structure is arranged on the inner circumference of the gas rod. Compared with the present scheme, the above schemes can be combined with the force-applying tool through the spline structure to rotate the gas rod. However, in the above scheme one, the protruding end of the gas rod is easily damaged during transportation. If it is protected, the transportation cost will be further increased. In the above scheme two, the damage of the gas rod end during transportation can be effectively avoided, but gas needs to flow inside the gas rod. On the one hand, the long-term circulation of gas will change the strength of the spline structure, thereby affecting the reliability of the combination of the spline structure and the force-applying tool. On the other hand, the special-shaped structure of the spline will affect the circulation of gas in the gas rod, thereby affecting the heat dissipation efficiency of the sealed pole.

[0028] Preferably, a joint is installed at the front end of the gas rod, the joint slides along the center axis of the gas rod, and the outer peripheral surface of the front end of the joint is arranged as a spline structure.

[0029] Through the above scheme, the joint is slid along the central axis of the gas rod and is positioned circumferentially. Then, during transportation, the joint is slid into the interior of the first slide rail and pulled out from the interior of the first slide rail when the gas rod is rotated in conjunction with a force-applying tool.

[0030] There are many ways to perform circumferential positioning while maintaining the axial sliding of the joint. For example, the outer peripheral surface of the joint is entirely set to a spline structure, and then a corresponding spline groove is opened inside the first guide rail. Compared with this solution, the above solution can achieve circumferential positioning of the joint, but the axial sliding of the joint is uncontrollable, which will not only make the combination of the joint and the force-applying tool unreliable, but also cause the joint to shake during transportation, resulting in collision with other structures;

[0031] Preferably, the front end of the gas rod is provided with a flange, an external thread section and a give-way section from front to back, the outer diameter of the flange is larger than the major diameter of the thread of the external thread section, the minor diameter of the thread of the external thread section is larger than the outer diameter of the give-way section, and the interior of the joint is provided with a connecting section and an internal thread section from front to back, the connecting section is a tapered hole with the major diameter in front, and the external thread section is matched and connected with the internal thread section.

[0032] Through this solution, during transportation, the joint is screwed into the first slider with the help of the external thread section and the internal thread section, and after the joint is completely entered into the first slider, the external thread section and the internal thread section can still remain connected, thereby ensuring that the joint will not shake during transportation. When connecting, the joint is screwed out in the same way, and the bottom wall of the connecting section is pressed against the rear end face of the flange, thereby locking the joint. Then, using a force-applying tool, the rotation direction of the screwed-out joint is maintained and the gas rod is rotated, thereby completing the locking of the bolt in the threaded hole.

[0033] According to the principle of ring network power supply, there are usually more than three solid insulated ring network cabinets in layout. If each solid insulated ring network cabinet is equipped with a cooling fan, on the one hand, the production and maintenance costs will be too high, and on the other hand, the connection between multiple cooling fans and gas rods will further reduce the efficiency of on-site operations;

[0034] Preferably, the outer diameter of the rear end of the gas rod gradually decreases, and a filling sleeve is provided at the rear end of the gas rod. The filling sleeve is configured as a conical structure and is made of a flexible, high-pressure resistant material. The taper of the filling sleeve is equal to the taper of the connecting section.

[0035] Through the above scheme, when multiple solid-insulated ring main units are in operation, the heat dissipation process can be completed by only one cooling fan. When two solid-insulated ring main units are installed together, the front end of the gas rod of one solid-insulated ring main unit is inserted into the rear end of the gas rod of the other solid-insulated ring main unit, and a tight connection is formed with the help of a filling sleeve to ensure the sealing of the gas circulation. In addition, the conical structure at the rear end of the gas rod also has a guiding function, which is convenient for the installation of the main gear and other parts on the gas rod.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The present invention guides the slide groove through the slide rail to support the sealed pole to avoid manual clamping, thereby reducing the assembly conditions of the sealed pole, thereby improving the assembly efficiency, and at the same time, the sealed pole only has the freedom to translate along the slide rail, and in the translation process of the sealed pole, the plurality of sealed poles are respectively positioned at set positions through the abutment of the bolts and the threaded holes, and the plurality of bolts are simultaneously locked through the rotation of the gas rod, thereby simultaneously completing the fixation of the plurality of sealed poles, and in addition, through the connection of the plurality of gas rods, the plurality of solid insulated ring network cabinets can also participate in the gas circulation to dissipate heat.

[0038] 2. The present invention sets two inclined surfaces before and after the threaded hole to reduce the resistance of the sealed pole on the slide rail, so as to facilitate the sliding of the sealed pole for positioning, and reduce the radial force on the bolt, so as to align the bolt with the threaded hole, thereby ensuring the accuracy of the bolt being screwed into the threaded hole, so as to ensure the reliability of the fixation of the sealed pole, and through the light section setting of the bolt, the bolt is easier to enter the threaded hole and the entry depth is greater, so as to enhance the positioning strength of the sealed pole.

[0039] 3. The present invention uses a connection method between the joint and the gas rod. On the one hand, the joint has circumferential and axial positioning while sliding along the axial direction of the gas rod, so that it can be connected to the force tool through its own spline structure to rotate the gas rod to lock the bolt. At the same time, it will not shake after shrinking to the inside of the gas rod, thereby avoiding damage caused by collision between structures. On the other hand, the joint is connected to the rear end of the gas rod, so that multiple sealed poles of multiple solid-insulated ring network cabinets are connected, which not only avoids the use of multiple cooling fans, thereby saving production and maintenance costs, but also avoids the need to connect gas pipelines, thereby improving installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall isometric structure of the present invention;

[0041] Figure 2 It is a schematic diagram of the assembly of the solid-sealed pole of the present invention;

[0042] Figure 3 For the present invention Figure 2 The enlarged schematic diagram of part A in the middle;

[0043] Figure 4 It is a right view structural schematic diagram of the solid-sealed pole of the present invention;

[0044] Figure 5 For the present invention Figure 4 The enlarged schematic diagram of part B in the middle;

[0045] Figure 6 For the present invention Figure 2 The enlarged schematic diagram of C1 and C2 parts;

[0046] Figure 7 For the present invention Figure 2 The enlarged schematic diagram of part D in the middle;

[0047] Figure 8 For the present invention Figure 2 Enlarged schematic diagram of part E in the middle.

[0048] In the figure: 1. busbar room; 2. instrument room; 3. operating mechanism room; 4. cable room; 5. pole room; 6. cooling fan; 7. first slide rail; 8. second slide rail; 9. sealed pole; 91. slide groove; 911. threaded hole; 912. introduction slope; 913. lead-out slope; 92. air duct; 10. gas rod; 101. flange; 102. external thread section; 103. yield section; 11. locking module; 111. main gear; 112. slave gear; 113. shaft bin; 114. suction plate; 115. spring; 116. limiter; 12. bolt; 121. light section; 13. joint; 131. connecting section; 132. internal thread section; 14. filling sleeve. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] See also Figures 1 to 8 The present invention provides a solid insulation ring network cabinet, and the technical solution is as follows:

[0051] Reference Figure 1 and Figure 2A solid insulated ring network cabinet comprises a busbar chamber 1, an instrument chamber 2, an operating mechanism chamber 3, a cable chamber 4 and a pole chamber 5. The busbar chamber 1 and the instrument chamber 2 are located at the top of the solid insulated ring network cabinet, with the instrument chamber 2 on the left and the busbar chamber 1 on the right. The operating mechanism chamber 3 and the pole chamber 5 are located in the middle of the solid insulated ring network cabinet, with the operating mechanism chamber 3 on the left and the pole chamber 5 on the right. The cable chamber 4 is located at the bottom of the solid insulated ring network cabinet. In accordance with the principle of ring network power supply, generally, the number of solid insulated ring network cabinets in an outer box will not be less than three. The busbar chambers 1 and the pole chambers 5 of multiple solid insulated ring network cabinets are connected to facilitate the arrangement of busbar plugs. The high-voltage bus and the high-voltage sub-line are connected from the cable chamber 4 respectively. In and out, the circuit is constructed by connecting the busbar plug in the busbar room 1 to the busbar, and various signals are arranged in the instrument room 2 to display the operating status of the solid insulated ring network cabinet in real time. A three-position switch operating mechanism is provided in the operating mechanism room 3 to switch the three states between the isolating switch and the grounding switch in the sealed pole 9, so as to realize different functions. The operating mechanism room 3 is also provided with a switch operating mechanism of the circuit breaker, and also includes a cooling fan 6, a first slide rail 7, a second slide rail 8, a sealed pole 9, a gas rod 10, a locking module 11 and a bolt 12. The cooling fan 6 is installed in the cable room 4. The cooling fan 6 can be used with a gas tank (such as sulfur hexafluoride gas), which can dissipate heat while , further improving the insulation performance of the sealed pole 9, the cable chamber 4 is provided with an outer door, and the internal space is large, so the cooling fan 6 is installed in the cable chamber 4, which is convenient for the maintenance of the cooling fan 6 and can better dissipate the heat generated by the cooling fan 6 when it is working. The first slide rail 7 and the second slide rail 8 are both installed in the pole chamber 5, and the first slide rail 7 and the second slide rail 8 are arranged diagonally in pairs. The advantage of the two-by-two diagonal arrangement is that the air passages 92 in the sealed pole 9 can be distributed more reasonably, and each air passage 92 runs from one corner point to another corner point. The paths of gas circulation in different air passages 92 are similar, so that the gas circulation cooling effect is more uniform. When supplying power with higher voltage and current, The second slide rail 8 is replaced by the first slide rail 7, and the slide groove 91 is designed accordingly. The sealed pole 9 is provided with a slide groove 91 and an air duct 92. The four slide grooves 91 are respectively connected with the first slide rail 7 and the second slide rail 8, and the slide groove 91 connected with the second slide rail 8 is provided with a threaded hole 911, and the threaded hole 911 is connected to the air duct 92. The gas rod 10 is installed inside the first slide rail 7, and the locking module 11 is arranged between the gas rod 10 and the slide groove 91. The bolt 12 is placed inside the locking module 11. The gas rod 10 and the bolt 12 are hollow inside. The cooling fan 6 is connected to the front ports of the two gas rods 10 respectively, and the cooling fan 6 supplies air to the front port of one gas rod 10 and exhausts air to the front port of the other gas rod 10.

[0052] The sealed pole 9 slides under the guidance of the first slide rail 7 and the second slide rail 8 on the slide groove 91, the screw end of the bolt 12 is inserted into the threaded hole 911 to position the sealed pole 9, and multiple locking modules 11 driven by the rotation of the gas rod 10 synchronously lock the bolt 12 to fix the sealed pole 9, and the air ducts 92 of multiple solid insulation ring network cabinets are connected by the connection between the front end and the rear end of the gas rod 10.

[0053] As an embodiment of the present invention, refer to Figure 3 and Figure 8 , the locking module 11 includes a main tooth 111, a slave tooth 112, a shaft bin 113, a suction plate 114, a spring 115 and a limiter 116, the main tooth 111 and the slave tooth 112 are bevel gears, the main tooth 111 is installed on the gas rod 10, the slave tooth 112 is meshed below the main tooth 111, and the slave tooth 112 is hollow inside, the shaft bin 113 is located below the slave tooth 112, and the shaft bin 113 is rotatably connected to the first slide rail 7, the inner contour of the shaft bin 113 is a regular hexagon, the suction plate 114 is clamped inside the shaft bin 113, and the suction plate 114 is set to a regular hexagonal prism structure, the suction plate 114 is made of permanent magnet material, the spring 115 is arranged between the suction plate 114 and the bottom wall of the shaft bin 113, the limiter 116 is connected above the suction plate 114, and the limiter 116 is hollow inside;

[0054] The bolt 12 is usually made of steel and is adsorbed by a suction plate 114 containing a permanent magnet material. The shape of the nut of the bolt 12 is generally a regular hexagon, so the shaft bin 113 with a regular hexagonal inner contour is used to position it circumferentially. In the natural state (that is, when the bolt 12 is not in contact with the slide groove 91), the bolt 12 extends out of the first slide rail 7 by a certain length. In the connected state (that is, when the slide groove 91 is pressed against the screw end face of the bolt 12), the spring 115 is deformed by force, so that the bolt 12 can move upward, so that the sealed pole 9 can slide smoothly on the slide rail until each bolt 12 is inserted into the corresponding threaded hole 911 to complete the positioning of all the sealed poles 9, and then the gas rod 10 is rotated to make the main tooth 111 drive the slave tooth 112 to rotate, and then the shaft bin 113 drives the bolt 12 to rotate, so that multiple bolts 12 are screwed into the threaded holes 911 and locked to complete the fixation of multiple sealed poles 9;

[0055] During the installation process, holes are opened on the top and bottom of the first slide rail 7. When installing the main tooth 111, the gas rod 10 is inserted from the front end of the first slide rail 7 and connected to the first slide rail 7 through a sealed bearing. The main tooth 111 is inserted into the hole above the first slide rail 7, so that the gas rod 10 passes through the main tooth 111. To facilitate the positioning of the two, set screws can be used for connection. The shaft bin 113 is installed in the hole below the first slide rail 7 and connected to the first slide rail 7 through a sealed bearing. The shaft bin 113 and the slave tooth 112 are an integral structure. After the suction plate 114, the spring 115 and the limit member 116 are installed in the shaft bin 113, the shaft bin 113 is inserted into the bearing and then placed together in the hole below the first slide rail 7. In order to axially position the shaft bin 113, a shaft shoulder is set on the outer periphery of the shaft bin 113, and the shaft shoulder fits the upper end surface of the bearing.

[0056] As an embodiment of the present invention, refer to Figure 3 The screw end of the bolt 12 is provided with a light section 121, and no thread is arranged on the circumference of the light section 121, and the light section 121 is set to a conical structure; during the processing, in order to save materials and omit the subsequent tapping steps, tubular steel can be used in the cold forging stage of the bolt 12, and after the light section 121 is machined, it can be rolled or machined with threads.

[0057] As an embodiment of the present invention, refer to Figure 5 The slide groove 91 engaged with the first slide rail 7 is provided with an introduction slope 912 and an outlet slope 913, which are respectively arranged at the rear and front of the threaded hole 911, and the introduction slope 912 passes through the outer contour of the solid-sealed pole 9, and the outlet slope 913 is connected to the front and rear symmetrical surfaces of the threaded hole 911, and the lowest ends of the introduction slope 912 and the outlet slope 913 are both located below the naturally drooping bolt 12; the slide groove 91 can be formed together when the solid-sealed pole 9 is injection molded. The epoxy resin used in the injection molding is a thermosetting plastic with good machinability. Therefore, the threaded hole 911, the introduction slope 912 and the outlet slope 913 are processed in the later stage to reduce the cost of mold design and production.

[0058] As an embodiment of the present invention, refer to Figure 4 , from a right viewing angle, the first slide rail 7 and the second slide rail 8 are both arranged obliquely in the pole chamber 5, and the first slide rail 7 and the second slide rail 8 have a low front end and a high rear end.

[0059] As an embodiment of the present invention, refer to Figure 2 and Figure 6, part of the sealed pole 9 with the slide groove 91 is set as a cylindrical structure, and the cross-section of the airway 92 is set as a circle; the sealed pole 9 is obtained by split-mold injection molding, and the raw material epoxy resin of the sealed pole 9 is a thermosetting plastic with good heat resistance. Therefore, epoxy resin can be used to manufacture a pipe consistent with the shape of the airway 92 (during manufacturing, it can be manufactured separately first and then bonded), and then when the mold is used to injection mold the sealed pole 9, the epoxy resin pipe is placed in the model cavity and fixed by the mold, and then after injection molding, the pipe and the sealed pole 9 are integrated to form the airway 92.

[0060] As an embodiment of the present invention, refer to Figure 3 and Figure 5 A joint 13 is installed at the front end of the gas rod 10. The joint 13 slides along the central axis of the gas rod 10, and the outer peripheral surface of the front end of the joint 13 is set as a spline structure.

[0061] As an embodiment of the present invention, refer to Figure 5 The front end of the gas rod 10 is provided with a flange 101, an external thread section 102 and a clearance section 103 from front to back. The outer diameter of the flange 101 is larger than the major diameter of the thread of the external thread section 102. The minor diameter of the thread of the external thread section 102 is larger than the outer diameter of the clearance section 103. The interior of the joint 13 is provided with a connecting section 131 and an internal thread section 132 from front to back. The connecting section 131 is a tapered hole with the major diameter at the front. The external thread section 102 is matched and connected with the internal thread section 132.

[0062] The bolt 12 is usually tightened clockwise, so when viewed from the front, the gas rod 10 drives the main tooth 111 to rotate clockwise. Therefore, the threads on the internal thread section 132 and the external thread section 102 are set to right-hand threads, so that the joint 13 connected to the force-applying tool drives the gas rod 10 to rotate clockwise while also being able to lock itself. When disassembling the sealed pole 9, in order to keep the joint 13 locked on the gas rod 10, first use the set screw to screw into the reserved hole of the flange 101 and the external thread section 102, and then rotate the gas rod 10 counterclockwise to unscrew the bolt 12 of the threaded hole 911, and then take out the sealed pole 9 from the rear ends of the first guide rail and the second guide rail in turn.

[0063] As an embodiment of the present invention, refer to Figure 7 The outer diameter of the rear end of the gas rod 10 gradually decreases, and a filling sleeve 14 is provided at the rear end of the gas rod 10. The filling sleeve 14 is set to a conical structure, and the filling sleeve 14 is made of a flexible, high-pressure resistant material, such as PDMS material. The taper of the filling sleeve 14 is equal to the taper of the connecting section 131.

[0064] Working principle: When installing the existing sealed pole 9, the flange of the sealed pole 9 is usually connected to the chamber partition. However, the number of sealed poles 9 in a ring network cabinet is not less than three, and the number of ring network cabinets assembled is usually more than three. Therefore, more flanges need to be connected. Using too many bolts 12 to connect the flanges will obviously reduce the efficiency of assembling the solid insulation ring network cabinet. Therefore, in this solution, a combination of slide rails and slide grooves 91 is used to complete the initial support of the sealed pole 9 and position the sealed pole 9 with multiple degrees of freedom, thereby eliminating a number of bolts 12, and the bolts 12 to be used are divided into two groups, and Each set of bolts 12 is tightened at the same time by the gas rod 10, thereby further improving the installation efficiency of the solid-sealed pole 9; the thickness of the solid-sealed pole 9 used in high-altitude areas will be too large, thereby affecting the internal heat dissipation of the solid-sealed pole 9, thereby affecting the life of the internal seal, so the present invention uses the gas rod 10 to tighten the bolts 12 to fix the solid-sealed pole 9, while connecting the cooling fan 6 and the internal channel of the solid-sealed pole 9 (i.e., the air duct 92) through the gas rod 10, and after multiple solid-insulated ring network cabinets are spliced, multiple gas rods 10 are interconnected, thereby forming a complete gas circulation for a set of solid-insulated ring network cabinets to achieve the heat dissipation function;

[0065] Specifically, before installing the sealed pole 9, the nut ends of the plurality of bolts 12 are respectively placed in the plurality of shaft bins 113 and adsorbed by the suction plate 114, and then the plurality of slide grooves 91 of the sealed pole 9 are pushed in along the front ends of the first slide rail 7 and the second slide rail 8;

[0066] In order to facilitate the sliding groove 91 of the sealed pole 9 to be put on the first slide rail 7 and the second slide rail 8, the sealed pole 9 with the sliding groove 91 is partially set as a cylindrical structure, so that the sliding groove 91 forms an arc-shaped port, so that the sliding rail is easier to enter the sliding groove 91, so as to improve the installation efficiency of the sealed pole 9; thereafter, the sealed pole 9 is pushed to continue to move to the right. During the right movement, the bolt 12 extending out of the lower end surface of the first slide rail 7 will be tightened by the sliding groove 91 and move upward through the deformation of the spring 115 until the screw end of the bolt 12 falls into the threaded hole 911 of the sliding groove 91. At this time, if the sealed pole 9 is to be pushed again, a large force needs to be applied to make the edge of the threaded hole 911 push the chamfer of the screw end of the bolt 12, so that the bolt 12 moves up again, so that the bolt 12 is disengaged from the threaded hole 911, and the above process is repeated, and multiple bolts 12 are respectively inserted into the threaded holes 911 of the three sealed poles 9, so as to form a complete positioning of the sealed pole 9;

[0067] In order to reduce the resistance encountered by the sealed pole 9 in the above process, an introduction slope 912 is provided at the rear of the threaded hole 911. In order to make it easier for the bolt 12 entering the threaded hole 911 to disengage, an introduction slope 912 is provided in front of the threaded hole 911, and the first slide rail 7 and the second slide rail 8 are arranged obliquely, so that the sealed pole 9 has a tendency to move from back to front along the slide rail at all times under the action of its own gravity, so that the bolt 12 is close to the threaded hole 911 to ensure the reliability of the positioning of the sealed pole 9. In addition, in order to make the bolt 12 inserted into the threaded hole 911 to a greater depth so as to make the above positioning more reliable, a light section 121 is provided on the bolt 12;

[0068] After the three sealed poles 9 are positioned, the joint 13 is screwed out of the gas rod 10, and a force-applying tool (such as a spline wrench) is used to connect the spline structure of the joint 13, and then the gas rod 10 is rotated to tighten the bolt 12, thereby fixing the sealed pole 9;

[0069] In order to prevent the joint 13 from extending out of the gas rod 10 during transportation and from shaking inside the gas rod 10, an internal thread section 132 is provided inside the joint 13, and an external thread section 102 is provided on the gas rod 10. The extension and insertion of the joint 13 are controlled by the connection between the internal thread section 132 and the external thread section 102.

[0070] After fixing the sealed pole 9, use a gas pipeline to connect the two ports of the cooling fan 6 to the two interfaces respectively, one port for air outlet and the other port for air intake. In the process of splicing multiple solid insulation ring network cabinets, multiple gas rods 10 are connected to realize integrated gas circulation.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A solid insulated ring main unit, comprising a busbar room (1), an instrument room (2), an operating mechanism room (3), a cable room (4) and a pole room (5), characterized in that: The invention also comprises a cooling fan (6), a first slide rail (7), a second slide rail (8), a sealed pole (9), an air rod (10), a locking module (11) and a bolt (12); the cooling fan (6) is installed inside the cable chamber (4); the first slide rail (7) and the second slide rail (8) are both installed in the pole chamber (5); the first slide rail (7) and the second slide rail (8) are both arranged diagonally in pairs; the sealed pole (9) is provided with a slide groove (91) and an air duct (92). ), the four slide grooves (91) are respectively connected to the first slide rail (7) and the second slide rail (8), and a threaded hole (911) is provided in the slide groove (91) connected to the second slide rail (8), and the threaded hole (911) is connected to the air duct (92), the gas rod (10) is installed inside the first slide rail (7), the locking module (11) is arranged between the gas rod (10) and the slide groove (91), and the bolt (12) is placed inside the locking module (11); The sealed pole (9) slides under the guidance of the first slide rail (7) and the second slide rail (8) on the slide groove (91), the screw end of the bolt (12) is inserted into the threaded hole (911) to position the sealed pole (9), and the multiple locking modules (11) driven by the rotation of the gas rod (10) synchronously lock the bolt (12) to fix the sealed pole (9), and the air ducts (92) of multiple solid insulation ring network cabinets are connected by the connection of the front end and the rear end of the gas rod (10).

2. A solid insulation ring main unit according to claim 1, characterized in that: The locking module (11) comprises a main tooth (111), a slave tooth (112), a shaft bin (113), a suction plate (114), a spring (115) and a stopper (116); the main tooth (111) and the slave tooth (112) are bevel gears; the main tooth (111) is mounted on the gas rod (10); the slave tooth (112) is meshed below the main tooth (111); the slave tooth (112) is hollow inside; the shaft bin (113) is located below the slave tooth (112); and the shaft bin (115) is provided with a plurality of springs (116) and a plurality of springs (115) arranged on the shaft bin (116). The shaft bin (113) is rotatably connected to the first slide rail (7), the inner contour of the shaft bin (113) is a regular hexagon, the suction plate (114) is clamped inside the shaft bin (113), and the suction plate (114) is set as a regular hexagonal prism structure, the suction plate (114) is made of permanent magnet material, the spring (115) is arranged between the suction plate (114) and the bottom wall of the shaft bin (113), the limiter (116) is connected above the suction plate (114), and the inside of the limiter (116) is hollow.

3. A solid insulation ring main unit according to claim 2, characterized in that: The screw rod end of the bolt (12) is provided with a light section (121), the peripheral surface of the light section (121) is not provided with threads, and the light section (121) is configured as a conical structure.

4. The solid insulation ring main unit according to claim 1, characterized in that: The slide groove (91) engaged with the first slide rail (7) is provided with an introduction slope (912) and an extraction slope (913), the introduction slope (912) and the extraction slope (913) are respectively arranged at the rear and the front of the threaded hole (911), the introduction slope (912) passes through the outer contour of the sealed pole (9), the extraction slope (913) is connected with the front and rear symmetrical surfaces of the threaded hole (911), and the lowest ends of the introduction slope (912) and the extraction slope (913) are both located below the naturally drooping bolt (12).

5. A solid insulation ring main unit according to claim 4, characterized in that: From a right-side viewing angle, the first slide rail (7) and the second slide rail (8) are both arranged obliquely in the pole chamber (5), and the first slide rail (7) and the second slide rail (8) both have a lower front end and a higher rear end.

6. The solid insulation ring main unit according to claim 1, characterized in that: The partially sealed pole (9) with the slide groove (91) is configured as a cylindrical structure, and the cross section of the air passage (92) is configured as a circle.

7. The solid insulation ring main unit according to claim 1, characterized in that: A joint (13) is installed at the front end of the gas rod (10), and the joint (13) slides along the central axis of the gas rod (10). The outer peripheral surface of the front end of the joint (13) is arranged as a spline structure.

8. The solid insulation ring main unit according to claim 7, characterized in that: The front end of the gas rod (10) is provided with a flange (101), an external thread section (102) and a clearance section (103) from front to back, the outer diameter of the flange (101) is larger than the major thread diameter of the external thread section (102), the minor thread diameter of the external thread section (102) is larger than the outer diameter of the clearance section (103), and the interior of the joint (13) is provided with a connecting section (131) and an internal thread section (132) from front to back, the connecting section (131) is a tapered hole with the major diameter at the front, and the external thread section (102) is connected to the internal thread section (132) in a matching manner.

9. The solid insulation ring main unit according to claim 8, characterized in that: The outer diameter of the rear end of the gas rod (10) gradually decreases, and a filling sleeve (14) is provided at the rear end of the gas rod (10). The filling sleeve (14) is configured as a conical structure and is made of a flexible, high-pressure resistant material. The taper of the filling sleeve (14) is equal to the taper of the connecting section (131).

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