Indoor three-pole electric single-pole double-throw disconnector

Abstract

The application discloses an indoor three-pole electric single-blade double-throw isolating switch and relates to the technical field of power system equipment. The technical points are as follows: the isolating switch comprises a mounting chassis, the mounting chassis is provided with a first wiring position, a second wiring position, a main-blade operating module, a third wiring position, a ground-blade operating module and a fourth wiring position; one end of the main-blade operating module is connected with the third wiring position, the main-blade operating module is connected with a main-blade driving mechanism, and the main-blade driving mechanism can drive the other end of the main-blade operating module to move between the second wiring position and the first wiring position; the ground-blade operating module is connected with a ground-blade driving mechanism, and the ground-blade driving mechanism is used for driving the ground-blade operating module to move towards the third wiring position with the fourth wiring position when grounding is needed. The isolating switch has the advantages of simple structure, small space occupancy, an electric grounding device arranged at the incoming line side, the ability to meet the requirements of reliability and flexibility of the power system and the ability to improve the safety of equipment maintenance.

Description

Technical Field

[0001] This application relates to the field of power system equipment technology, and in particular to an indoor three-pole electric single-pole double-throw disconnector. Background Technology

[0002] Large pumped storage units all employ a static frequency converter (SFC) variable frequency start-up system. The SFC system is a crucial piece of equipment for starting the pumps of large pumped storage units, quickly bringing the unit from a standstill to synchronous speed, thus reducing the impact on the power grid during startup and grid connection. The entire process is mainly divided into two stages. In the initial startup phase, because the inverter's frequency change is relatively slow, it cannot generate an alternating magnetic field on the transformer. Therefore, the SFC bypass switch is located on the bypass side and directly connected to the unit. When the speed rises to 8%Ne (Ne signal, i.e., the engine crankshaft speed signal), the bypass switch switches to the output side of the transformer (in bypass operation, the process of switching the bypass system to the output side connected to the transformer (main transformer)). The unit is then connected through the transformer. Therefore, the success of the bypass switch switching is critical to the normal operation of the variable frequency start-up system.

[0003] Currently, many large-scale pumped storage units in China that have been put into operation use imported SFC (Self-Fueling Control) system bypass switching devices. This results in high investment costs, and the imported equipment suffers from high failure rates due to its bent transmission rods, position signal loss, slow response speed, and long maintenance cycles. While some domestic companies have mastered the core technology of SFC systems and successfully applied it to some large-scale pumped storage units, the types of SFC bypass switching devices available for domestic pumped storage projects remain limited. Therefore, providing more alternative bypass switching devices to replace imported equipment is urgently needed. Utility Model Content

[0004] This application provides an indoor three-pole electric single-pole double-throw disconnector to solve the problems mentioned in the background art.

[0005] The above-mentioned objective of this application is achieved through the following technical solution:

[0006] An indoor three-pole electric single-pole double-throw disconnector includes a mounting base. One end of the mounting base is provided with a first wiring position, and the other end of the mounting base is provided with a second wiring position, a main blade operating module, a third wiring position, a ground blade operating module and a fourth wiring position in sequence along its width direction.

[0007] The first connection point is a high-voltage output point, the second connection point is a low-voltage output point, the third connection point is an input point, and the fourth connection point is a connection point.

[0008] One end of the main blade operating module is connected to the third terminal, and the middle position of the main blade operating module is connected to the main blade driving mechanism. The main blade driving mechanism can drive the other end of the main blade operating module to move between the second terminal and the first terminal.

[0009] One end of the grounding switch operating module is connected to a grounding switch driving mechanism. When grounding is required, the grounding switch driving mechanism is used to drive the grounding switch operating module to move from the fourth terminal to the third terminal.

[0010] Furthermore, the mounting base includes two parallel T-shaped side frames. The tops of the vertical sections of the two T-shaped side frames are fixedly connected together by an upper beam. Two parallel lower beams are fixedly connected between the horizontal sections of the two T-shaped side frames. A supporting crossbeam is welded to each of the lower beams at a position corresponding to the second wiring position and the third wiring position, and both ends of the supporting crossbeam are fixedly connected to the horizontal sections of the two T-shaped side frames.

[0011] The second and third wiring terminals are respectively installed on the two supporting crossbeams, and the first wiring terminal is installed on the upper beam.

[0012] Furthermore, the first, second, and third terminals are all composed of an insulator, a terminal block, and a detachable contact. The detachable contact is mounted on the insulator via the terminal block. The insulator of the first terminal is fixedly connected to the upper beam, and the insulators of the second and third terminals are respectively fixedly connected to the two supporting crossbeams. The insulators of the second and third terminals are both vertically upward, and the height of the contact of the third terminal is higher than the height of the contact of the second terminal. The insulator of the first terminal is inclined from top to bottom toward the contact of the second terminal.

[0013] Furthermore, the main blade operating module includes a main blade shaft, with both ends of the main blade shaft rotatably inserted into the horizontal sections of the two T-shaped side frames. An insulating pull rod is hinged to the main blade shaft along its axial direction and at positions corresponding to the first and second wiring positions. One end of the insulating pull rod away from the main blade shaft is hinged to the middle position of the main isolation blade. One end of the main isolation blade is hinged to the wiring plate on the third wiring position.

[0014] Furthermore, the grounding knife operating module includes a grounding knife shaft, with both ends of the grounding knife shaft rotatably inserted into the horizontal sections of the two T-shaped side frames. A grounding knife rod is fixedly connected to the grounding knife shaft at a position corresponding to the third wiring position along its axial direction. A grounding blade is connected to the end of the grounding knife rod away from the grounding knife shaft.

[0015] Furthermore, the number of the first terminal block, the second terminal block, the third terminal block, the ground blade, and the main isolation blade are all three, and the terminal block in the third terminal block is provided with an extension plug on the side away from the second terminal block.

[0016] Furthermore, the three ground blades in the grounding knife operating module are connected together by a metal flat steel, and the fourth terminal is installed on the metal flat steel.

[0017] Furthermore, both the main cutting tool shaft and the ground cutting tool shaft are equipped with mechanical limiting devices. The mechanical limiting device includes a limiting stop fixedly connected to one of the T-shaped side frames. A limiting sleeve is fixedly sleeved on the main cutting tool shaft or the ground cutting tool shaft at a position corresponding to the limiting stop. A first limiting stop and a second limiting stop are installed on the outside of the limiting sleeve. The first limiting stop will contact the limiting stop when the main cutting tool shaft or the ground cutting tool shaft rotates clockwise to its maximum stroke. The second limiting stop will contact the limiting stop when the main cutting tool shaft or the ground cutting tool shaft rotates counterclockwise to its maximum stroke.

[0018] Furthermore, both the main cutter shaft and the ground cutter shaft are equipped with signal transmission devices; the signal transmission device includes a U-shaped clip fixedly welded to the main cutter shaft or the ground cutter shaft, the U-shaped clip is hinged to one end of the auxiliary switch pull plate, the other end of the auxiliary switch pull plate is hinged to one section of the auxiliary switch crank arm, the other end of the auxiliary switch crank arm is connected to the signal input shaft in the auxiliary switch module, and the auxiliary switch module is fixedly installed on the outside of one of the T-shaped side frame plates.

[0019] Furthermore, the main blade drive mechanism includes a protective shell, which is mounted on one of the T-shaped side frames. Inside the protective shell, along its length, are sequentially connected a motor, a friction clutch, a transmission unit, and a manual drive unit. Both the motor and the manual drive unit can transmit power to the main blade shaft through the transmission unit.

[0020] The structure of the ground blade drive mechanism and the main blade drive mechanism is the same.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] The indoor three-pole electric single-pole double-throw disconnector of this application has four terminals on the mounting frame, namely the first terminal, the second terminal, the third terminal, and the fourth terminal. The main knife drive mechanism can control the main knife operation module to achieve synchronous switching of the three-pole single-pole double-throw disconnector between the first terminal and the third terminal. When grounding is required, the grounding knife drive mechanism can drive the grounding knife operation module to rotate its plate to the first terminal and connect it, ensuring reliable grounding of the power line and thus improving the safety of equipment maintenance. Compared with using two sets of electric disconnectors and one grounding switch, the disconnector with this structure has the advantages of small overall space occupation and simple equipment structure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a top view of the overall structure of this application;

[0025] Figure 2 This is a side view of the overall structure of this application;

[0026] Figure 3 This is a three-dimensional structural diagram of the overall structure of this application;

[0027] Figure 4 This is a plan view viewed from the terminal block end of the first terminal block in this application;

[0028] Figure 5 This is a schematic diagram showing the state of the main isolating blade and the contacts in the first wiring position when they are connected;

[0029] Figure 6 This is an enlarged structural schematic diagram of the extension plug in the third wiring position of this application;

[0030] Figure 7 This is a schematic diagram of the mechanical limiting device of this application;

[0031] Figure 8 This is a planar schematic diagram of the signal transmission structure of this application;

[0032] Figure 9 This is a three-dimensional structural diagram of the signal transmission structure of this application;

[0033] Figure 10 This is a schematic diagram of the main blade drive mechanism of this application;

[0034] Figure 11 This is a schematic diagram of a single system in this application.

[0035] Attached reference numerals: 1. Mounting base frame; 101. T-shaped side frame; 102. Upper beam; 103. Lower beam; 104. Support beam; 2. First wiring position; 21. Insulator; 22. Terminal block; 23. Contact; 3. Second wiring position; 4. Main blade operating module; 41. Main blade shaft; 42. Insulating pull rod; 43. Main isolating blade; 5. Third wiring position; 6. Grounding blade operating module; 61. Grounding blade shaft; 62. Grounding blade rod; 63. Grounding blade; 7. Fourth wiring position; 8. Main blade drive Mechanism; 81. Protective shell; 82. Motor; 83. Friction clutch; 84. Transmission unit; 85. Manual drive unit; 9. Ground knife drive mechanism; 10. Extension plug; 11. Metal flat steel; 12. Mechanical limit device; 121. Limit stop; 122. Limit sleeve; 123. First limit stop pin; 124. Second limit stop pin; 13. Signal transmission device; 131. U-shaped clip; 132. Auxiliary switch pull plate; 133. Auxiliary switch crank arm; 134. Auxiliary switch module. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 11 As shown, this application discloses an indoor three-pole electric single-pole double-throw disconnector, which includes a mounting base 1. One end of the mounting base 1 is provided with a first terminal 2, and the other end of the mounting base 1 is provided with a second terminal 3, a main blade operating module 4, a third terminal 5, a ground blade operating module 6 and a fourth terminal 7 in sequence along its width direction.

[0038] The first terminal 2 is the high voltage output terminal, the second terminal 3 is the low voltage output terminal, the third terminal 5 is the input terminal, and the fourth terminal 7 is the connection terminal.

[0039] One end of the main blade operating module 4 is connected to the third terminal 5, and the middle position of the main blade operating module 4 is connected to the main blade drive mechanism 8. The main blade drive mechanism 8 can drive the other end of the main blade operating module 4 to move between the second terminal 3 and the first terminal 2.

[0040] One end of the grounding switch operating module 6 is connected to the grounding switch drive mechanism 9. When grounding is required, the grounding switch drive mechanism 9 is used to drive the grounding switch operating module 6 to move the fourth terminal 7 to the third terminal 5.

[0041] In the above embodiments, the indoor three-pole electric single-pole double-throw disconnector of this application has four wiring positions on the mounting base 1. The four wiring positions are the first wiring position 2, the second wiring position 3, the third wiring position 5, and the fourth wiring position 7. The main blade drive mechanism 8 can control the main blade operation module 4 to achieve the effect of synchronous switching of three-pole single-pole double-throw disconnector between the first wiring position 2, the second wiring position 3, and the third wiring position 5. When grounding is required, the grounding blade drive mechanism 9 can drive the grounding blade operation module 6 to rotate its plate to the first wiring position 2 and connect it, ensuring reliable grounding of the power line, thereby improving the safety of equipment maintenance. Compared with using two sets of electric disconnectors and one grounding switch, the disconnector of this application has the advantages of small overall space occupation and simple equipment structure.

[0042] Furthermore, such as Figures 1-3 As shown, the mounting base 1 includes two parallel T-shaped side frames 101. The tops of the vertical sections of the two T-shaped side frames 101 are fixedly connected together by an upper beam 102. Two parallel lower beams 103 are fixedly connected between the horizontal sections of the two T-shaped side frames 101. A supporting crossbeam 104 is welded to the lower beam 103 at the positions corresponding to the second wiring position 3 and the third wiring position 5, and the two ends of the supporting crossbeam 104 are fixedly connected to the horizontal sections of the two T-shaped side frames 101, respectively.

[0043] The second terminal 3 and the third terminal 5 are respectively installed on the two supporting crossbeams 104, and the first terminal 2 is installed on the upper beam 102.

[0044] In the above embodiments, the mounting bracket of this application is set up in the manner described above, which can meet the installation needs of different equipment while saving the space occupied by the entire equipment. The upper ends of the vertical sections of the two T-shaped side frames 101 are connected by an upper beam 102, and the horizontal sections of the two T-shaped side frames 101 are connected by supports. In this way, when they are assembled together, they can not only form a stable integrated structure, but the upper beam 102 and the lower beam 103 can also provide an installation platform for the first wiring position 2, the second wiring position 3 and the third wiring position 5. The support beam 104 added on the lower beam 103 can increase the overall strength of the bottom area of ​​the T-shaped side frame 101, and can also provide more installation positions for the equipment.

[0045] Furthermore, such as Figures 3-5As shown, the first terminal 2, the second terminal 3, and the third terminal 5 are all composed of an insulator 21, a terminal block 22, and a detachable contact 23. The detachable contact 23 is mounted on the insulator 21 through the terminal block 22. The insulator 21 of the first terminal 2 is fixedly connected to the upper beam 102, and the insulators 21 of the second terminal 3 and the third terminal 3 are fixedly connected to the two supporting beams 104 respectively. The insulators 21 of the second terminal 3 and the third terminal 5 are both vertically upward, and the height of the contact 23 of the third terminal 5 is higher than the height of the contact 23 of the second terminal 3. The insulator 21 of the first terminal 2 is inclined from top to bottom towards the contact 23 of the second terminal 3.

[0046] In the above embodiments, the connection methods of the contact 23, insulator 21, and terminal block 22 in the first terminal 2, second terminal 3, and third terminal 5 are similar. This application only illustrates the specific connection method of the contact 23, insulator 21, and terminal block 22 in the first terminal 2. In the first terminal 2, the end of the insulator 21 away from the upper beam 102 is fixedly connected to the terminal block 22 by bolts. The contact 23, which is used to connect with the main blade operating module 4, is also installed on the terminal block 22 by bolts. In this way, when the contact 23 is worn, only the contact 23 needs to be replaced, without replacing the terminal block 22, etc., which can effectively reduce maintenance costs. The insulator 21 of the first terminal 2, second terminal 3, and third terminal 5 is set in the above manner to ensure that when the main blade drive mechanism 8 drives the main blade operating module 4, the on / off operation can be smoothly realized between the first terminal 2 and the second terminal 3.

[0047] Furthermore, such as Figure 1 and Figure 3 As shown, the main blade operating module 4 includes a main blade shaft 41. The two ends of the main blade shaft 41 are rotatably inserted into the horizontal sections of the two T-shaped side frames 101. An insulating pull rod 42 is hinged to the main blade shaft 41 along its axial direction and at the positions corresponding to the first wiring position 2 and the second wiring position 3. The end of the insulating pull rod 42 away from the main blade shaft 41 is hinged to the middle position of the main isolation blade 43. One end of the main isolation blade 43 is hinged to the wiring plate 22 on the third wiring position 5.

[0048] In the above embodiments, to improve the stability of the main cutting shaft 41 of this application, a support groove can be opened on the lower beam 103 at a position corresponding to the main cutting shaft 41. A perforated side plate is installed on one side of the support groove along the axial direction of the main cutting shaft 41 by bolts and nuts. When the main cutting shaft 41 passes from one T-shaped side frame 101 to another T-shaped side frame 101, it can smoothly pass through the support groove and the perforated side plate on the lower beam 103. This provides multiple support points for the main cutting shaft 41, thereby effectively improving its stability during use. The main isolation blade 43 on the main cutting shaft 41 is used to operate between the first terminal 2 and the second terminal 3 corresponding to its position. Therefore, the number of main isolation blades 43 is the same as the number of first terminal 2 and second terminal 3. Correspondingly, the position of the insulating pull rod 42 used by the main isolation blade 43 to connect with the main cutting shaft 41 on the main cutting shaft 41 corresponds to the position of the first terminal 2 and the second terminal 3 that need to be switched on and off. One end of the insulating pull rod 42 is connected to a bracket (e.g., as attached to the patent document with application number 202210320844.9). Figure 1 The bracket labeled 1 is a common type of bracket used to install insulating tie rods. It is hinged to the main blade shaft 41, and the other end of the insulating tie rod 42 is hinged to the middle position of the main isolation blade 43. In this way, when the main blade shaft 41 rotates, the main isolation blade 43 can be driven to switch freely between the first terminal 2 and the second terminal 3 through the insulating tie rod 42.

[0049] Furthermore, such as Figure 1 and Figure 3 As shown, the grounding knife operating module 6 includes a grounding knife shaft 61. The two ends of the grounding knife shaft 61 are respectively rotatably inserted into the horizontal sections of the two T-shaped side frames 101. A grounding knife rod 62 is fixedly connected to the grounding knife shaft 61 along its axial direction and at the position corresponding to the third wiring position 5. A grounding blade 63 is connected to the end of the grounding knife rod 62 away from the grounding knife shaft 61.

[0050] In the above embodiments, the grounding blade shaft 61 can adopt the same technical means as the main blade shaft 41 in the previous embodiment to improve its stability during use. The grounding blade shaft 61 and the grounding rod 62 are both fixedly connected, and the number of grounding rods 62 is equal to the number of third terminal blocks 5, and their positions correspond one-to-one. When the grounding blade shaft 61 rotates, it can swing the grounding blade 63 up and down. When the grounding blade 63 contacts the third terminal block 5, the grounding operation can be realized. When the grounding blade 63 leaves the third terminal block 5, the disconnection operation can be realized.

[0051] Furthermore, such as Figure 1 , Figure 3 and Figure 6As shown, there are three of each of the first terminal block 2, the second terminal block 3, the third terminal block 5, the ground blade, and the main isolation blade 43. The terminal block 22 in the third terminal block 5 is provided with an extension plug 10 on the side away from the second terminal block 3.

[0052] In the above embodiments, the extension plug 10 on the side of the terminal block 22 away from the second terminal block 3 on the third terminal block 5 has an L-shaped structure. The vertical section of the extension plug 10 is fixedly installed on the terminal block 22 of the third terminal block 5 by bolts. The horizontal section of the extension plug 10 has rounded corners on both sides along its width direction, and the end corners of the horizontal section of the extension plug 10 are cut. This makes it convenient for the cut end of the extension plug 10 to be plugged in when the grounding blade 63 is close to the extension plug 10. When the extension plug 10 is worn, the operator can simply remove the extension plug 10 and replace it with a new one. This achieves the same cost-saving effect as the detachable contact 23.

[0053] Currently, the contact method of the conventional disconnector contact 23 is to make a protrusion by stamping or machining the contact area of ​​the disconnector to reduce the resistance when the disconnector is engaged and disengaged. This method is not easy to adjust during assembly. In addition, after the equipment has been running for a long time, the maintenance cost is high when the meshing parts are worn.

[0054] The detachable contact 23 and detachable extension plug 10 used in this application can effectively solve the above problems from the following two aspects. Since the design concept of the detachable contact 23 and the detachable extension plug 10 is the same, only the detachable contact 23 will be used as an example here.

[0055] Firstly, during the installation and commissioning phase of the equipment, only slight tightening is required between the contact 23 and the terminal block 22 to ensure that they do not fall off. This will create a certain assembly gap between the contact 23 and the terminal block 22. Under these conditions, when the disconnecting switch is closed, the small assembly gap in the mounting hole on the contact 23 allows for self-alignment when the main isolating blade 43 contacts the contact 23, ensuring good contact between the main isolating blade 43 and the contact 23. On this basis, the bolts between the contact 23 and the terminal block 22 are then tightened, thereby facilitating equipment adjustment.

[0056] Secondly, when wear inevitably occurs in the contact 23 part during use, the detachable contact 23 design of this application only requires replacing a smaller part of the contact 23, without replacing the entire knife switch, thus reducing equipment maintenance costs.

[0057] Furthermore, such as Figure 1 and Figure 3As shown, the three ground blades in the ground blade operating module 6 are connected together by a metal flat steel 11, and the fourth terminal 7 is installed on the metal flat steel 11.

[0058] In the above embodiments, the fourth terminal 7 of this application is a common screw-pressed structure. That is, in use, one end of the grounding wire is wound around the terminal block on the fourth terminal 7, and the grounding wire is connected to the fourth terminal 7 by tightening the nut on the terminal block. The metal flat steel 11 that mounts the fourth terminal 7 is fixedly connected to the three grounding blades. Thus, when the three grounding blades and their corresponding extension plugs 10 are assembled together, each connected line can achieve a stable grounding effect, ensuring reliable grounding and improving the safety of equipment maintenance.

[0059] Furthermore, such as Figure 1 and Figure 7 As shown, mechanical limiting devices 12 are installed on both the main blade shaft 41 and the ground blade shaft 61. The mechanical limiting device 12 includes a limiting stop 121 fixedly connected to one of the T-shaped side frames 101. A limiting sleeve 122 is fixedly sleeved on the main blade shaft 41 or the ground blade shaft 61 at a position corresponding to the limiting stop 121. A first limiting stop 123 and a second limiting stop 124 are installed on the outside of the limiting sleeve 122. The first limiting stop 123 will contact the limiting stop 121 when the main blade shaft 41 or the ground blade shaft 61 rotates clockwise to the maximum stroke. The second limiting stop 124 will contact the limiting stop 121 when the main blade shaft 41 or the ground blade shaft 61 rotates counterclockwise to the maximum stroke.

[0060] In the above embodiments, when the main cutter shaft 41 or the ground cutter shaft 61 rotates, the limiting sleeve 122 installed on the main cutter shaft 41 or the ground cutter shaft 61 will rotate along with the first limiting stop pin 123 and the second limiting stop pin 124 on it. The first limiting stop pin 123 and the second limiting stop pin 124 on the main cutter shaft 41 correspond to the positions of the main isolation cutter 43 rotating to the first terminal position 2 and the second terminal position 3, respectively. The first limiting stop pin 123 and the second limiting stop pin 124 on the ground cutter shaft 61 correspond to the positions of the ground cutter blade rotating to the third terminal position 5 and the horizontal state, respectively. In this way, whether the main isolation cutter 43 or the ground cutter blade is adjusted, the mechanical limiting device 12 can limit its expected position, reducing the deviation between the main isolation cutter 43 or the ground cutter blade and the target position during use. In actual use, the installation position of the mechanical limiting device 12 on the main cutter shaft 41 and the ground cutter shaft 61 is not limited, such as Figure 1 As shown, the mechanical limiting device 12 on the main cutter shaft 41 can be set in front of one of the T-shaped side frames 101, and the mechanical limiting device 12 on the ground cutter shaft 61 can be set in front of the other T-shaped side frame 101. The only difference between the two is the installation position, while the structure and working principle remain the same.

[0061] Furthermore, such as Figure 3 , Figure 8 and Figure 9 As shown, both the main cutter shaft 41 and the ground cutter shaft 61 are equipped with signal transmission devices 13. The signal transmission device 13 includes a U-shaped clip 131 fixedly welded to the main cutter shaft 41 or the ground cutter shaft 61. The U-shaped clip 131 is hinged to one end of the auxiliary switch pull plate 132. The other end of the auxiliary switch pull plate 132 is hinged to one section of the auxiliary switch crank arm 133. The other end of the auxiliary switch crank arm 133 is connected to the signal input shaft in the auxiliary switch module 134. The auxiliary switch module 134 is fixedly installed on the outside of one of the T-shaped side frame 101 plates.

[0062] In the above embodiments, when the main blade shaft 41 or the ground blade shaft 61 rotates, it will rotate together with the auxiliary switch pull plate 132 through the U-shaped clip 131 connected to them. When the auxiliary switch pull plate 132 is activated, it will transmit the rotation signal to the auxiliary switch module 134 through the signal input shaft of the auxiliary switch module 134 via the auxiliary switch crank arm 133. The auxiliary switch module 134 can then transmit the rotation information of the main blade shaft 41 or the ground blade shaft 61 to achieve the monitoring effect of the movement status of the main blade shaft 41 and the ground blade shaft 61.

[0063] Furthermore, such as Figure 1 , Figure 3 and Figure 10 As shown, the main blade drive mechanism 8 includes a protective shell 81, which is mounted on one of the T-shaped side frames 101. Inside the protective shell 81, along its length, are sequentially connected a motor 82, a friction clutch 83, a transmission unit 84, and a manual drive unit 85. Both the motor 82 and the manual drive unit 85 can transmit power to the main blade shaft 41 through the transmission unit 84. The ground blade drive mechanism 9 has the same structure as the main blade drive mechanism 8.

[0064] In the above embodiments, when the motor 82 is working, it transmits power to the transmission unit 84 through the friction clutch 83. The transmission unit 84 can reverse the direction of the power, transmitting it to the main cutter shaft 41 to drive the main cutter shaft 41 to rotate (the structure of the transmission unit 84 is similar to that of a worm gear reducer; in use, it can not only reduce the speed but also reverse the direction of power transmission). This achieves the effect of controlling the swing angle of the main isolating cutter 43. After the main isolating cutter 43 has reached its position, if the motor 82 has not stopped, the friction clutch 83 will disconnect the power transmission between the two to prevent equipment damage. A manual drive unit 85 is provided on one side of the transmission unit 84. During debugging or electrical faults, the isolating switch can be manually operated via a crank handle in the manual drive unit 85. Simultaneously, a position sensor can be installed in the hole for inserting the crank handle in the manual drive unit 85, connected to the position switch on the motor 82. When the crank handle is inserted for manual operation of the main cutter shaft 41, the position switch can disconnect the operating circuit of the motor 82, preventing accidental operation of the motor 82 and thus improving the safety protection level. The structure of the ground blade drive mechanism 9 and the main blade drive mechanism 8 is the same, and their working principle can be referred to the main blade drive mechanism 8.

[0065] The implementation principle of this embodiment is as follows: The disconnecting switch of this application has four connection positions: a first connection position 2, a second connection position 3, a third connection position 5, and a fourth connection position 7. The first connection position 2 is the high-voltage output position, the second connection position 3 is the low-voltage output position, the third connection position 5 is the input position, and the fourth connection position 7 is the grounding position. When it is necessary to switch the main disconnecting blade 43 away from the third connection position 5 from the first connection position 2 to the second connection position 3 or from the second connection position 3 to the first connection position 2, the motor 82 in the main blade drive mechanism 8 or the manual drive unit 85 in the main blade drive mechanism 8 is started to drive the main blade shaft 41 to rotate in the corresponding direction. The main blade shaft 41 can then drive the main disconnecting blade 43 to move to the designated position. In addition, an electric grounding function is provided on the third connection position 5 side of this application. When grounding is required, the motor 82 in the grounding blade drive mechanism 9 or the manual drive unit 85 can drive the grounding blade shaft 61 to rotate, so that the grounding blade 63 rotates from the initial horizontal state to connect with the third connection position 5, so as to ensure reliable grounding of the line and improve the safety of equipment maintenance. This application adopts a three-pole coaxial linkage structure, which simplifies the equipment structure. Due to its simple design, strong practicality, and ease of promotion and use, it is easy to promote and use.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An indoor three-pole electric single-pole double-throw disconnector, characterized in that: The mounting base (1) includes a first wiring position (2) at one end of the mounting base (1), and a second wiring position (3), a main blade operating module (4), a third wiring position (5), a ground blade operating module (6) and a fourth wiring position (7) sequentially arranged along its width direction at the other end of the mounting base (1). The first terminal (2) is the high voltage output terminal, the second terminal (3) is the low voltage output terminal, the third terminal (5) is the input terminal, and the fourth terminal (7) is the connection terminal. One end of the main blade operating module (4) is connected to the third terminal (5), and the main blade driving mechanism (8) is connected to the middle position of the main blade operating module (4). The main blade driving mechanism (8) can drive the other end of the main blade operating module (4) to move between the second terminal (3) and the first terminal (2). One end of the grounding switch operating module (6) is connected to the grounding switch driving mechanism (9). When grounding is required, the grounding switch driving mechanism (9) is used to drive the grounding switch operating module (6) to move the fourth terminal (7) towards the third terminal (5).

2. The indoor three-pole electric single-pole double-throw disconnector according to claim 1, characterized in that: The mounting base (1) includes two parallel T-shaped side frames (101). The tops of the vertical sections of the two T-shaped side frames (101) are fixedly connected together by an upper beam (102). Two parallel lower beams (103) are fixedly connected between the horizontal sections of the two T-shaped side frames (101). A supporting crossbeam (104) is welded to the lower beam (103) at the position corresponding to the second wiring position (3) and the third wiring position (5), and the two ends of the supporting crossbeam (104) are fixedly connected to the horizontal sections of the two T-shaped side frames (101). The second terminal (3) and the third terminal (5) are respectively installed on the two supporting beams (104), and the first terminal (2) is installed on the upper beam (102).

3. The indoor three-pole electric single-pole double-throw disconnector according to claim 2, characterized in that: The first terminal (2), the second terminal (3), and the third terminal (5) are all composed of an insulator (21), a terminal block (22), and a detachable contact (23). The detachable contact (23) is mounted on the insulator (21) through the terminal block (22). The insulator (21) of the first terminal (2) is fixedly connected to the upper beam (102), and the insulator (21) of the second terminal (3) and the third terminal (3) are fixedly connected to the two supporting beams (104) respectively. The insulator (21) of the second terminal (3) and the third terminal (5) are both vertically upward, and the height of the contact (23) of the third terminal (5) is higher than the height of the contact (23) of the second terminal (3). The insulator (21) of the first terminal (2) is inclined from top to bottom toward the contact (23) of the second terminal (3).

4. The indoor three-pole electric single-pole double-throw disconnector according to claim 3, characterized in that: The main blade operating module (4) includes a main blade shaft (41). The two ends of the main blade shaft (41) are respectively rotatably inserted on the horizontal sections of the two T-shaped side frames (101). An insulating pull rod (42) is hinged on the main blade shaft (41) along its axial direction and at the positions corresponding to the first wiring position (2) and the second wiring position (3). The end of the insulating pull rod (42) away from the main blade shaft (41) is hinged to the middle position of the main isolation blade (43). One end of the main isolation blade (43) is hinged to the wiring plate (22) on the third wiring position (5).

5. The indoor three-pole electric single-pole double-throw disconnector according to claim 4, characterized in that: The grounding knife operating module (6) includes a grounding knife shaft (61). The two ends of the grounding knife shaft (61) are respectively rotatably inserted on the horizontal sections of two T-shaped side frames (101). A grounding knife rod (62) is fixedly connected to the grounding knife shaft (61) at the position corresponding to the third wiring position (5) along its axial direction. A grounding blade (63) is connected to the end of the grounding knife rod (62) away from the grounding knife shaft (61).

6. The indoor three-pole electric single-pole double-throw disconnector according to claim 5, characterized in that: The number of the first terminal (2), the second terminal (3), the third terminal (5), the ground blade and the main isolation blade (43) are all three. The terminal block (22) in the third terminal (5) is provided with an extension plug (10) on the side away from the second terminal (3).

7. The indoor three-pole electric single-pole double-throw disconnector according to claim 6, characterized in that: The three ground blades in the ground blade operating module (6) are connected together by a metal flat steel (11), and the fourth terminal (7) is installed on the metal flat steel (11).

8. The indoor three-pole electric single-pole double-throw disconnector according to any one of claims 5 to 7, characterized in that: Mechanical limiting devices (12) are installed on both the main cutting shaft (41) and the ground cutting shaft (61). The mechanical limiting device (12) includes a limiting stop (121) fixedly connected to one of the T-shaped side frames (101). A limiting sleeve (122) is fixedly sleeved on the main cutting shaft (41) or the ground cutting shaft (61) at a position corresponding to the limiting stop (121). A first limiting stop (123) and a second limiting stop (124) are installed on the outside of the limiting sleeve (122). The first limiting stop (123) will contact the limiting stop (121) when the main cutting shaft (41) or the ground cutting shaft (61) rotates clockwise to the maximum stroke. The second limiting stop (124) will contact the limiting stop (121) when the main cutting shaft (41) or the ground cutting shaft (61) rotates counterclockwise to the maximum stroke.

9. The indoor three-pole electric single-pole double-throw disconnector according to any one of claims 5 to 7, characterized in that: Signal transmission devices (13) are installed on both the main cutter shaft (41) and the ground cutter shaft (61). The signal transmission device (13) includes a U-shaped clip (131) fixedly welded to the main cutter shaft (41) or the ground cutter shaft (61). The U-shaped clip (131) is hinged to one end of the auxiliary switch pull plate (132). The other end of the auxiliary switch pull plate (132) is hinged to one section of the auxiliary switch crank arm (133). The other end of the auxiliary switch crank arm (133) is connected to the signal input shaft in the auxiliary switch module (134). The auxiliary switch module (134) is fixedly installed on the outside of one of the T-shaped side frame (101) plates.

10. The indoor three-pole electric single-pole double-throw disconnector according to claim 2, characterized in that: The main blade drive mechanism (8) includes a protective shell (81), which is mounted on one of the T-shaped side frames (101). Inside the protective shell (81), along its length, are a motor (82), a friction clutch (83), a transmission unit (84), and a manual drive unit (85). Both the motor (82) and the manual drive unit (85) can transmit power to the main blade shaft (41) through the transmission unit (84). The structure of the ground blade drive mechanism (9) and the main blade drive mechanism (8) is the same.

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