An up-in and up-out back joint ring network cabinet

Abstract

The application provides an up-feeding and up-outgoing back-connection ring net cabinet, and relates to the technical field of ring net cabinets, which comprises a supporting mechanism, a cabinet body, a circuit breaker mechanism, a circuit breaker module, a manual voltage isolation module, a five-prevention interlocking mechanism and multiple groups of double-pass bushing bases. The double-pass bushing base is arranged above the rear of the air tank, the inner end of the double-pass bushing base is connected with a three-position switch, and the outer end of the double-pass bushing is used for connecting a user high-voltage cable; the up-feeding and up-outgoing back-connection ring net cabinet is formed, and compared with a traditional down-feeding and down-outgoing ring net cabinet, the distance between the double-pass bushing base and the bottom of the cable chamber is longer, so that the wiring and installation work of the user high-voltage cable is more convenient; in addition, since the secondary chamber and the mechanism chamber of the ring net cabinet are separately arranged on the two sides of the air tank, the secondary chamber and the mechanism chamber are designed into independent closed spaces in structure and process; and the secondary chamber and the mechanism chamber are not adjacent to the lower cable trench, so that the humid gas cannot enter, and it is difficult to form condensation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of outdoor ring main unit, in particular to an up-in and up-out back joint type ring main unit. BACKGROUND

[0002] The traditional outdoor ring main unit is a down-in and down-out type ring main unit, and the mechanism chamber is arranged directly above the cable chamber. Due to the compact structure of the ring main unit, the space of the cable chamber is small, especially the height of the cable chamber. When installing the cable, the operator needs to frequently bend over and work, which not only increases the difficulty of installation and maintenance, but also may affect the wiring quality due to limited operation space. In addition, the outdoor ring main unit has various anti-condensation measures, such as adding a ventilation chimney on the top cover, adding a ventilation support at the bottom, increasing the area of the louver on the side, adding a heater or a fan in the cable chamber or the secondary chamber, etc. The investment cost is large, which is not economical and environmentally friendly. Therefore, the present application provides a back joint type ring main unit. SUMMARY

[0003] The present application provides an up-in and up-out back joint type ring main unit to solve the above technical problems.

[0004] The technical scheme adopted by the present application is as follows:

[0005] An up-in and up-out back joint type ring main unit comprises a support mechanism, a cabinet body installed on the support mechanism, and the cabinet body comprises a cable chamber, an air tank, a mechanism chamber, an instrument chamber and a secondary chamber which are independent of each other. The cable chamber, the air tank, the mechanism chamber, the instrument chamber and the secondary chamber are arranged in front and back different sides as a whole, wherein the cable chamber is arranged on the back of the cabinet body, the air tank and the mechanism chamber are arranged above the secondary chamber, the air tank is in a vacuum state and is located between the mechanism chamber and the cable chamber, and a certain gap is left between the top of the air tank and the inner wall of the cabinet body; the instrument chamber is arranged above the mechanism chamber; a circuit breaker mechanism comprises a fixed frame, a vacuum circuit breaker and a three-position switch; wherein the fixed frame is fixed to the inner side wall of the air tank; the vacuum circuit breaker is installed on the fixed frame; the three-position switch is installed on the fixed frame, and the three-position switch is arranged above the vacuum circuit breaker; a circuit breaker module is installed in the mechanism chamber, and the circuit breaker module is connected with the vacuum circuit breaker; a manual voltage isolation module is connected with the three-position switch, wherein the manual voltage isolation module is located above the circuit breaker module; a five-proof interlocking mechanism is installed on the manual voltage isolation module and the cabinet body, and is used for controlling the opening or closing of the cable chamber door plate; a plurality of groups of double-pass sleeve seats are installed on the upper end of the air tank and correspond to the three-position switches one by one, the outer ends of the double-pass sleeve seats are located above the cable chamber, and the inner ends of the double-pass sleeve seats are located in the air tank; the cable passes through the cable chamber from the bottom of the support mechanism and is connected to the outer ends of the double-pass sleeve seats, and the inner ends of the double-pass sleeve seats are connected with the three-position switches.

[0006] The manual voltage isolation module comprises: a front plate and a rear plate, the front plate and the rear plate are arranged in parallel to form a cavity, and the front plate and the rear plate are connected through a connecting unit; a switching operation unit is arranged in the cavity and is installed on the front plate and the rear plate, and is connected with the three-position switch, and is used for realizing the separation or closing of the moving contact and the static contact of the three-position switch; an isolation operation unit is arranged in the cavity and is installed on the front plate and the rear plate; a grounding operation unit is arranged in the cavity and is installed on the front plate and the rear plate; an energy storage spring unit is connected with the isolation operation unit and the grounding operation unit at two ends; a magnetic blow unit is installed on the switching operation shaft of the switching operation unit; the magnetic blow unit comprises a second sector gear, a magnetic blow gear and a magnetic blow switch; the second sector gear is fixedly installed on the switching operation shaft of the switching operation unit; the magnetic blow gear is rotatably installed on the front plate through a gear shaft two, and the gear shaft two extends to the outside of the front plate; the magnetic blow gear is engaged with the second sector gear; the magnetic blow switch is installed on the gear shaft two located outside the front plate; the magnetic blow unit further comprises two travel switches installed on the front plate and matched with the magnetic blow switch.

[0007] Further, a layer of felt is applied to the top of the mechanism chamber and the secondary chamber.

[0008] Further, the support mechanism comprises: a base in a frame structure; a support plate installed on the base, the support plate being provided with a wire inlet port corresponding to the cable chamber; a cross beam installed at the wire inlet port, the cross beam being provided with a connecting hole, and a lock nut being installed at the connecting hole on the inner side of the cross beam; a clamp, the clamp being installed on the cross beam through an inner hexagonal bolt and being connected with the lock nut, and the clamp being used in cooperation with the cross beam to fix the cable.

[0009] Further, a wire hole is arranged at the bottom of the cable chamber at the position of the wire inlet port, and a zero sequence current transformer is installed at the wire hole in the cable chamber, and the cable is sequentially connected with the outer end of the double-pass bushing through a cable joint from the bottom of the base, the wire inlet port, the clamp, the wire hole and the zero sequence current transformer.

[0010] Further, a side expansion bushing is installed on the side of the gas tank, the side expansion bushing is connected with the vacuum circuit breaker through a copper bar, and a side expansion cover is detachably installed on the side expansion bushing, and the cabinet body is provided with an opening one corresponding to the position of the side expansion bushing.

[0011] Further, a gas pressure gauge is connected with the gas tank through a pipeline, and the gas pressure gauge is installed on the door of the mechanism chamber.

[0012] Further, the five-prevention interlocking mechanism comprises: a cam installed on an isolation ground operating shaft of the manual voltage isolation module; a support plate installed on the manual voltage isolation module and above the cam; a guide unit comprising a guide sleeve, a guide rod and a spring, the support plate is provided with a connecting hole, the guide sleeve is fixedly connected in the connecting hole, the guide rod is matched with the guide sleeve and is slidably connected in the guide sleeve, the bottom end of the guide rod is connected with a limiting plate, and the spring is sleeved on the guide rod and located between the guide sleeve and the limiting plate; a fixed seat installed on the support plate; a locking unit comprising a interlocking rod and a locking piece, the interlocking rod is installed on the top of the cabinet body through a bearing with a seat, the interlocking rod is above the air tank, the locking piece is installed on the end of the interlocking rod away from the interlocking unit and is used for locking the door plate; an interlocking unit comprising a plurality of locking arms, the locking arms are hingedly connected, the locking arm at the first end is fixedly connected with the top end of the guide rod, the locking arm at the end is fixedly connected with one end of the interlocking rod, and the locking arm hingedly connected with the first end locking arm is rotatably connected with the fixed seat; the cam drives the guide unit to move linearly, the guide unit controls the interlocking unit to act, the interlocking unit controls the locking unit to rotate, and the opening and closing of the door plate are realized.

[0013] Further, at least two partitions are arranged in the cable chamber, and the cable chamber is divided into cable chamber I and cable chamber II which are independent of each other, wherein the door plates are rotatably arranged on the cable chamber I and the cable chamber II, and the door plates are provided with lock openings corresponding to the locking pieces.

[0014] Further, the manual voltage isolation module comprises: a front plate and a rear plate, the front plate and the rear plate are arranged in parallel to form a cavity, and the front plate and the rear plate are connected through a connecting unit I; an opening and closing operating unit penetrating the cavity and installed on the front plate and the rear plate, and connected with the three-position switch, used for realizing the separation or closing of the movable contact and the static contact of the three-position switch; an isolation operating unit penetrating the cavity and installed on the front plate and the rear plate; a ground operating unit penetrating the cavity and installed on the front plate and the rear plate; an energy storage spring unit, the two ends of which are connected with the isolation operating unit and the ground operating unit respectively; and a magnetic blow unit installed on the opening and closing operating shaft of the opening and closing operating unit.

[0015] The beneficial effects of the present application are as follows:

[0016] (1) The present application is an up-in and up-out back connection type ring main unit, a double-pass bushing seat is arranged above the cable chamber and connected with the air tank, and the inner end of the double-pass bushing seat is connected with the three-position switch, thereby forming an up-in and up-out back connection type ring main unit. Compared with the traditional down-in and down-out type ring main unit, the distance between the double-pass bushing seat and the bottom of the cable chamber is longer, so the wiring path is longer and the operation space is larger, which greatly reduces the wiring difficulty.

[0017] (2) The structure of the ring main unit has the inherent anti-condensation feature. On the one hand, the secondary chamber, mechanism chamber and cable chamber of the ring main unit are not on the same side; in this way, the secondary chamber and mechanism chamber are easy to realize the independent closed space in structure and process, the humid gas cannot enter, and it is difficult to form condensation; on the other hand, a layer of special material felt is laid on the top of the mechanism chamber and secondary chamber, and the possibility of condensation is extremely small; therefore, the ring main unit of the application can completely not need to install such electrical anti-condensation equipment.

[0018] (3) The gas tank is filled with sulfur hexafluoride, and has the features of full insulation, full sealing, full inflation and full shielding.

[0019] (4) Through the supporting mechanism, the cable is fixed on the base through the cooperation of the hoop and the cross beam while supporting the cabinet, which is more convenient and firm for fixing the cable;

[0020] (5) Through the five-prevention connecting mechanism, mechanical interlocking ensures that the "door plate state and the operating state of the disconnecting switch are interlocked", so that the disconnecting switch is in a safe state when the door plate is opened, and the operator can operate the disconnecting switch normally, realizing the unity of safety and convenience; at the same time, interlocking instead of electrical control, mechanical interlocking is not affected by power supply or electrical element failure;

[0021] (6) The manual voltage isolation module is composed of a front plate and a rear plate to form a cavity frame, and integrates a closing and opening operation unit, an isolation operation unit, a grounding operation unit and an energy storage spring unit inside; each unit is linked through mechanical structures such as shaft sleeve, gear and crank arm to realize the closing and opening control of the three-position switch, circuit isolation and grounding operation, and the control structure is simple, and the operation stability is improved through the energy storage spring unit. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a whole structure schematic view of the up-in and up-out back connection type ring main unit of the embodiment of the application;

[0023] Figure 2 It is a structure schematic view of the up-in and up-out back connection type ring main unit of one embodiment of the application;

[0024] Figure 3 It is a front internal structure schematic view of the up-in and up-out back connection type ring main unit of one embodiment of the application;

[0025] Figure 4 It is a back internal structure schematic view of the up-in and up-out back connection type ring main unit of one embodiment of the application;

[0026] Figure 5 It is an internal structure schematic view of the up-in and up-out back connection type ring main unit of one embodiment of the application Figure 1 ;

[0027] Figure 6 Internal structure diagram of the up-in and up-out back-to-back ring main unit according to an embodiment of the present application Figure 2 ;

[0028] Figure 7 Internal structure diagram of the up-in and up-out back-to-back ring main unit according to an embodiment of the present application Figure 3 ;

[0029] Figure 8 Structure diagram of the supporting mechanism according to an embodiment of the present application

[0030] Figure 9 Installation diagram of the up-in and up-out back-to-back ring main unit according to an embodiment of the present application

[0031] Figure 10 Structure diagram of the five-prevention interlocking mechanism according to an embodiment of the present application

[0032] Figure 11 Structure diagram of the cam, the supporting plate, the guiding assembly, the fixing seat and the locking assembly according to an embodiment of the present application

[0033] Figure 12 Connection diagram of the five-prevention interlocking mechanism and the door plate according to an embodiment of the present application

[0034] Figure 13 Structure diagram of the locking assembly according to an embodiment of the present application

[0035] Figure 14 Structure diagram of the manual voltage disconnecting switch one / manual voltage disconnecting switch two according to an embodiment of the present application

[0036] Figure 15 Exploded structure diagram of the manual voltage disconnecting switch one / manual voltage disconnecting switch two according to an embodiment of the present application

[0037] Figure 16 Plan view diagram of the manual voltage disconnecting switch one / manual voltage disconnecting switch two according to an embodiment of the present application

[0038] Figure 17 Connection diagram of the opening and closing operation unit, the magnetic blow unit, the isolation operation unit, the grounding operation unit and the energy storage spring unit according to an embodiment of the present application Figure 1 ;

[0039] Figure 18 Connection diagram of the opening and closing operation unit, the magnetic blow unit, the isolation operation unit, the grounding operation unit and the energy storage spring unit according to an embodiment of the present application Figure 2 ;

[0040] Figure 19Connection diagram of the opening and closing operation unit, magnetic blow unit, isolation operation unit, grounding operation unit and energy storage spring unit of one embodiment of the present application Figure 2 .

[0041] Legend:

[0042] 10 - support mechanism, 11 - base, 12 - support plate, 13 - crossbeam, 14 - hoop.

[0043] 20 - cabinet body, 21 - cable chamber, 211 - zero sequence current transformer, 212 - partition, 213 - cable chamber 1, 214 - cable chamber 2, 215 - door plate, 216 - lock, 22 - air tank, 221 - side expansion sleeve, 222 - side expansion cover, 223 - air pressure gauge, 23 - mechanism chamber, 24 - instrument chamber, 25 - secondary chamber;

[0044] 30 - double-pass sleeve seat;

[0045] 40 - circuit breaker mechanism, 41 - vacuum circuit breaker, 42 - three-position switch, 43 - fixed frame;

[0046] 60 - circuit breaker module;

[0047] 70 - manual voltage isolation module, 73 - front plate, 74 - rear plate;

[0048] 75 - opening and closing operation unit, 751 - opening and closing operation shaft, 752 - operation handle, 753 - sector gear 1, 754 - opening and closing gear, 755 - gear shaft 1, 756 - shaft sleeve;

[0049] 76 - isolation operation unit, 761 - isolation operation shaft, 762 - isolation crank arm, 763 - crank arm actuating pin 1, 764 - isolation limit plate, 765 - isolation drive plate, 766 - pin column 1, 767 - isolation actuating pin, 768 - isolation drive slot;

[0050] 77 - grounding operation unit, 771 - grounding operation shaft, 772 - grounding crank arm, 773 - crank arm actuating pin 2, 774 - grounding limit plate, 775 - grounding drive plate, 776 - pin column 2, 777 - grounding actuating pin, 778 - grounding drive slot;

[0051] 78 - energy storage spring unit, 781 - spring guide shaft, 782 - opening and closing spring, 783 - pad sleeve, 784 - limit plate 1, 785 - interlocking plate;

[0052] 790 - magnetic blow unit, 7901 - sector gear 2, 7902 - magnetic blow gear, 7904 - gear fixing plate, 7905 - magnetic blow switch, 7906 - travel switch;

[0053] 79-Connecting unit one, 791-Limiting sleeve, 792-Connecting bolt;

[0054] 80-Five-proof interlocking mechanism, 81-Cam, 82-Support plate, 83-Guide unit, 831-Guide sleeve, 832-Guide rod, 833-Spring, 84-Fixed seat, 85-Locking unit, 851-Interlocking rod, 852-Locking piece, 853-Bearing with seat, 86-Interlocking unit, 861-Locking arm. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] like Figures 1-19 As shown, an embodiment of the present invention provides a top-in, top-out back-connected ring main unit, which includes a support mechanism 10, a cabinet 20, a circuit breaker mechanism 40, a circuit breaker module 60, a manual voltage isolation module 70, a five-proof interlocking mechanism 80, and multiple sets of double-pass bushings 30.

[0057] like Figures 1-7 As shown, the cabinet 20 is mounted on the support mechanism 10. The cabinet 20 includes an independent cable compartment 21, an air box 22, a mechanism compartment 23, an instrument compartment 24, and a secondary compartment 25. The cable compartment 21, air box 22, mechanism compartment 23, instrument compartment 24, and secondary compartment 25 are arranged in a front-to-back, opposite-side configuration. The cable compartment 21 is located at the back of the cabinet 20. The air box 22 and mechanism compartment 23 are located above the secondary compartment 25. The air box 22 is in a vacuum state and is located between the mechanism compartment 23 and the cable compartment 21. A certain gap is left between the top of the air box 22 and the inner wall of the cabinet 20. The instrument compartment 24 is located above the mechanism compartment 23. The secondary compartment 25 can be used to install secondary equipment, such as transformers.

[0058] It should be understood that the distance between the bushing seat of the conventional down-in and down-out ring main unit and the bottom of the cable chamber is short, resulting in narrow operation space when connecting the cable and the bushing seat. The staff needs to frequently bend over and work, which not only increases the difficulty of installation and maintenance, but also may affect the connection quality due to the limited operation space. In addition, the environment of the outdoor ring main unit is often humid, and the cable chamber is close to the ground, which is easy to accumulate moisture. Due to the short connection distance and thick cable, in order to facilitate connection, the cable is cut and divided, and it is difficult to completely seal at the connection (the opening formed by cutting the cable is located below the cable chamber). Moisture will gradually penetrate into the cable through these unsealed or poorly sealed parts. Once the moisture enters, a water film will form in the insulation layer, reducing the insulation resistance and causing electrical failure.

[0059] The ring main unit adopts a "front and rear opposite side" layout design, and the cable chamber is independently arranged at the back of the cabinet body, which is the main area that may contact external humid gas (such as moisture in the underground cable trench and moisture after evaporation of outdoor rainwater). The secondary chamber and the mechanism chamber are arranged on the front of the cabinet body and are not on the same side as the cable chamber, and can form an independent closed space in structure and process (such as through a sealing door plate and a joint sealing treatment).

[0060] This physical isolation makes it difficult for humid gas to enter the secondary chamber and the mechanism chamber, reducing the possibility of condensation of humid air in these areas from the source (it should be understood that the prerequisite for condensation is that there is enough humid gas in the space).

[0061] As shown in Figures 5-6 The circuit breaker mechanism 40 includes a fixed frame 43, a vacuum circuit breaker 41, and a three-position switch 42. The fixed frame 43 is fixed to the inner side wall of the gas tank 22. The vacuum circuit breaker 41 is installed on the fixed frame 43. The three-position switch 42 is installed on the fixed frame 43 and is arranged above the vacuum circuit breaker 41. The three-position switch 42 and the vacuum circuit breaker 41 are connected by a copper bar.

[0062] The circuit breaker module 60 is installed in the mechanism chamber 23 and is in transmission connection with the vacuum circuit breaker 41. Specifically, the operation shaft of the circuit breaker module 60 is in transmission connection with the drive shaft of the vacuum circuit breaker 41. The circuit breaker module is a core execution component for controlling the opening and closing action of the vacuum circuit breaker. Its structure and principle are based on mature high-voltage switch control technology, including a transmission component and other structures. It transmits force to the moving contact of the vacuum circuit breaker through an insulating pull rod. In the present application, since the circuit breaker module and the three-position switch are both prior art, the structure thereof is not improved, and the structure and principle thereof will not be described in detail.

[0063] The manual voltage isolation module 70 is in transmission connection with the three-position switch 42, wherein the manual voltage isolation module 70 is located above the circuit breaker module 60.

[0064] As shown in Figure 3 The five-prevention interlocking mechanism 80 is installed on the manual voltage isolation module 70 and the cabinet body 20, and is used for controlling the opening or closing of the door plate 215 of the cable chamber 21.

[0065] A plurality of groups of double-pass bushing bases 30 are installed on the upper end of the gas tank 22 and correspond to the three-position switch 42, and the outer end is located above the cable chamber 21 and the inner end is located in the gas tank 22. The cable is connected to the outer end of the double-pass bushing base 30 from the bottom of the support mechanism 10 through the cable chamber 21, and the inner end of the double-pass bushing base 30 is in electrical connection with the three-position switch 42.

[0066] In the embodiment of the present application, the gas tank is a sealed shell formed by welding, and the shell material can be selected from high-strength steel plates (such as cold-rolled steel plates); the gas tank shell is made of a metal material (such as a steel plate) with good electrical conductivity, which can effectively shield the electromagnetic field generated by the internal high-voltage equipment and avoid electromagnetic interference on external equipment. The surfaces of the conductive components (such as copper bars and switches) in the gas tank are treated (such as tin plating or shielding layer coating), which reduces the local electric field concentration and avoids electromagnetic interference between internal components.

[0067] The gas tank is a sealed welded structure, and the gas tank is filled with sulfur hexafluoride gas. The excellent insulation performance (insulation strength is 2.5 times that of air) and arc extinguishing ability of the gas tank ensure the insulation reliability of the high-voltage components (vacuum circuit breakers and three-position switches) in the gas tank. The gas tank material can be 304 stainless steel with a thickness of not less than 3 mm, which has corrosion resistance and mechanical strength and is suitable for outdoor harsh environments.

[0068] The "inner end" of the double-pass bushing base extends into the gas tank, and the outer shell is made of an insulating material (such as porcelain or composite insulating material), which insulates and isolates the conductive part on the cable side from other components in the gas tank. All conductive components (such as copper bars and switch contacts) in the gas tank are wrapped in sulfur hexafluoride gas, and there is no exposed metal part on the outside. Through the combination of gas insulation and solid insulation material, overall insulation is achieved.

[0069] In one embodiment of the present application, a layer of felt (such as wool felt, synthetic fiber felt, etc.) is laid on the top of the mechanism chamber 23 and the secondary chamber 25. The felt has good adsorbability and can absorb a small amount of residual water vapor in the space, reducing the air humidity; at the same time, the felt can play a certain heat preservation role, reducing the local cooling caused by the large temperature difference between indoor and outdoor, and avoiding the condensation of water vapor due to sudden temperature drop.

[0070] As shown in Figure 8 and Figure 9As shown in the drawings, in one embodiment of the present application, the support mechanism 10 comprises a base, a support plate 12, a crossbeam 13 and a clamp 14. Among them, the base is in a frame structure; the support plate 12 is installed on the base, and the support plate 12 is provided with a wire inlet port corresponding to the cable chamber 21; the crossbeam 13 is installed at the wire inlet port, and the crossbeam 13 is provided with a connecting hole, and a locking nut is installed at the connecting hole on the inner side of the crossbeam 13; the clamp 14 is installed on the crossbeam 13 through a hexagonal bolt and is connected with the locking nut, and the clamp 14 cooperates with the crossbeam 13 to fix the cable.

[0071] As shown in the drawings, Figure 4 and Figure 8 As shown in the drawings, in one embodiment of the present application, the bottom of the cable chamber 21 is provided with a wire hole at the wire inlet port position, and a zero sequence current transformer 211 is installed at the wire hole in the cable chamber 21, and the cable passes through the wire inlet port, the clamp 14, the wire hole and the zero sequence current transformer 211 from the bottom of the base and is connected with the outer end of the double-pass bushing base 30 through a cable joint.

[0072] In one embodiment of the present application, the side of the gas tank 22 is provided with a side expansion bushing 221, the side expansion bushing 221 is connected with the vacuum circuit breaker 41 through a copper bar, and the side expansion bushing 221 is detachably provided with a side expansion cover 222, and the cabinet 20 is provided with an opening one corresponding to the position of the side expansion bushing 221.

[0073] As shown in the drawings, Figure 3 As shown in the drawings, in one embodiment of the present application, the gas tank 22 is connected with a gas pressure gauge 223 through a pipeline, and the gas pressure gauge 223 is installed on the door of the mechanism chamber 23. The gas pressure gauge 223 can monitor the internal pressure of the gas tank 22 in real time, and can timely alarm once leakage (the pressure is lower than the threshold value) occurs.

[0074] As shown in the drawings, Figure 3 , Figure 10 , Figure 11 , Figure 12 and Figure 13As shown in the figure, in one embodiment of the present application, the five-prevention interlocking mechanism 80 comprises a cam 81, a support plate 82, a guide unit 83, a fixed seat 84, a locking unit 85 and an interlocking unit 86. Among them, the cam 81 is installed on the isolation ground operation shaft 771 of the manual voltage isolation module 70; the support plate 82 is installed on the manual voltage isolation module 70 and above the cam 81; the guide unit 83 comprises a guide sleeve 831, a guide rod 832 and a spring 833, a connecting hole is formed on the support plate 82, the guide sleeve 831 is fixedly connected in the connecting hole, the guide rod 832 is matched with the guide sleeve 831 and is slidingly connected in the guide sleeve 831, the bottom end of the guide rod 832 is connected with a limiting plate, and the spring 833 is sleeved on the guide rod 832 and located between the guide sleeve 831 and the limiting plate; the fixed seat 84 is installed on the support plate 82; the locking unit 85 comprises an interlocking rod 851 and a locking piece 852, the interlocking rod 851 is installed on the top of the cabinet body 20 through a bearing with a seat 853, the interlocking rod 851 is above the air tank 22, the locking piece 852 is installed on the end of the interlocking rod 851 away from the interlocking unit 86 and is used for locking the door plate 215; the interlocking unit 86 comprises a plurality of lock arms 861, the plurality of lock arms 861 are hinged, the lock arm 861 at the first end is fixedly connected with the top end of the guide rod 832, the lock arm 861 at the last end is fixedly connected with one end of the interlocking rod 851, and the lock arm 861 hinged with the first end lock arm 861 is rotationally connected with the fixed seat 84.

[0075] In the embodiment of the present application, the cam 81 drives the linear motion of the guide unit 83, the guide unit 83 controls the action of the interlocking unit 86, the interlocking unit 86 controls the rotation of the locking unit 85, and the opening and closing of the door plate 215 are realized.

[0076] As shown in the figure, Figure 7 In one embodiment of the present application, at least two partitions 212 are arranged in the cable chamber 21, and the cable chamber 21 is divided into two independent cable chambers 213 and 214 by the partitions 212. Among them, the door plate 215 is rotationally arranged on the cable chamber 213 and the cable chamber 214, and the lock hole 216 corresponding to the locking piece 852 is arranged on the door plate 215.

[0077] Specifically, two partitions 212 are arranged in the cable chamber 21, and the cable chamber 21 is divided into two cable chambers 213 and 214 by the partitions 212; therefore, corresponding to the cable chambers 213 and 214, three groups of double-pass sleeve seats 30 are correspondingly arranged.

[0078] As shown in the figure, Figures 14-19As shown, in one embodiment of the application, the three-position switch 42 is driven by the manual voltage isolation module (mechanical transmission) through the isolation operation shaft, and when the operation shaft rotates, the toggle lever pushes the movable contact to slide along the guide groove, realizing the switching of the three positions; during the switching process, the travel of the movable contact is limited by the limiting block, ensuring accurate positioning of each position. Specifically, the manual voltage isolation module includes a front plate 73, a rear plate 74, a closing and opening operation unit 75, an isolation operation unit 76, a grounding operation unit 77, an energy storage spring unit 78, and a magnetic blowout unit 790.

[0079] Wherein, the front plate 73 and the rear plate 74 are arranged in parallel to form a cavity, and the front plate 73 and the rear plate 74 are connected by a connecting unit 79; the closing and opening operation unit 75 is arranged in the cavity and mounted on the front plate 73 and the rear plate 74, and is in transmission connection with the three-position switch, for realizing the separation or closing of the movable contact and the static contact of the three-position switch; the isolation operation unit 76 is arranged in the cavity and mounted on the front plate 73 and the rear plate 74; the grounding operation unit 77 is arranged in the cavity and mounted on the front plate 73 and the rear plate 74; the energy storage spring unit 78 is connected with the isolation operation unit 76 and the grounding operation unit 77 at both ends; and the magnetic blowout unit 790 is mounted on the closing and opening operation shaft 751 of the closing and opening operation unit 75.

[0080] In the embodiment of the application, the manual voltage isolation switch is composed of the cavity frame of the front plate 73 and the rear plate 74, and the closing and opening operation unit 75, the isolation operation unit 76, the grounding operation unit 77, and the energy storage spring unit 78 are integrated inside, and each unit is linked through mechanical structures such as shaft sleeve 756, gear, and toggle lever, for realizing the closing and opening control, circuit isolation, and grounding operation of the three-position switch, and at the same time, the energy storage spring unit 78 improves the operation stability.

[0081] As Figures 14-19As shown, specifically, the opening and closing operation unit 75 can include an opening and closing operation shaft 751, an operation handle 752, a sector gear one 753, and an opening and closing gear 754. The opening and closing operation shaft 751 is connected to the front plate 73 and the rear plate 74 through a shaft sleeve 756, which is fixedly installed on the front plate 73 and the rear plate 74 by welding or the like, and the opening and closing operation shaft 751 is rotationally connected to the shaft sleeve 756, with one end of the opening and closing operation shaft 751 extending outward to the outside of the front plate 73. The operation handle 752 is fixedly connected to the end of the opening and closing operation shaft 751 away from the rear plate 74. The sector gear one 753 is installed on the opening and closing operation shaft 751 and is arranged close to the rear plate 74. The opening and closing gear 754 has a gear shaft one 755 fixedly connected thereto, and the gear shaft one 755 is connected to the rear plate 74 through a wheel sleeve, which is fixedly connected to the rear plate 74 by welding or the like, and the gear shaft one 755 is rotationally connected to the wheel sleeve, and the gear shaft one 755 is connected to the square shaft of the moving contact of the three-position switch through the rear plate 74, the gear shaft one 755 drives the square shaft to rotate, and the opening and closing gear 754 is engaged with the sector gear one 753.

[0082] During operation, the operation handle 752 is rotated clockwise, the opening and closing operation shaft 751 drives the sector gear one 753 to rotate, and the opening and closing gear 754 is driven to rotate by engagement. When closing, the moving contact of the three-position switch 42 is closed with the static contact, and when opening, the moving contact is separated from the static contact to form a clear break, thereby realizing circuit isolation.

[0083] As shown in Figures 14-19 The magnetic blowout unit 790 includes a sector gear two 7901, a magnetic blowout gear 7902, a gear fixing plate 7904, and a magnetic blowout switch 7905. The sector gear two 7901 is fixedly installed on the opening and closing operation shaft 751 and rotates synchronously with the opening and closing operation shaft 751, and is arranged close to the front plate 73. The magnetic blowout gear 7902 has a gear shaft two fixedly connected thereto, and the gear shaft two is connected to the front plate 73 through a wheel sleeve, which is fixedly installed on the front plate 73 by welding or the like, and the gear shaft two is rotationally connected to the wheel sleeve, and the gear shaft two extends to the outside of the front plate 73, and the magnetic blowout gear 7902 is engaged with the sector gear two 7901. The gear fixing plate 7904 is fixedly connected to the front plate 73 through a connecting unit two, and the gear shaft two is connected to the gear fixing plate 7904 through a wheel sleeve fixedly connected to the gear fixing plate 7904, and the gear shaft two is rotationally connected to the wheel sleeve, and the gear fixing plate 7904 is located in the cavity. The magnetic blowout switch 7905 is installed on the gear shaft two located outside the front plate 73.

[0084] As shown in Figures 14-19As shown, the magnetic blow-out unit 790 also includes two limit switches 7906 mounted on the front plate 73 to cooperate with the magnetic blow-out switch 7905. During opening and closing operations, the magnetic blow-out gear 7902 drives the gear shaft 2 to rotate, thereby driving the magnetic blow-out switch 7905 to rotate. The cam 81 of the magnetic blow-out switch 7905 triggers the limit switches 7906 to actuate, realizing the electrical interlock of circuit on / off. Two limit switches 7906 are provided, maintaining a state of one open and one closed.

[0085] like Figures 14-19 As shown, the isolation operation unit 76 may include an isolation operation shaft 761, an isolation crank arm 762, an isolation limiting plate 764, an isolation drive plate 765, and an isolation actuating pin 767. The isolation operation shaft 761 is connected to the front plate 73 and the rear plate 74 via a bushing 756, with one end extending outward to the outside of the front plate 73. The isolation crank arm 762 is fixedly mounted on the isolation operation shaft 761, and a crank arm actuating pin 763 is fixedly mounted on the isolation crank arm 762. The isolation limiting plate 764 is fixedly mounted on the rear plate 74 and located within a cavity. The isolation limiting plate 764 limits the rotation range of the isolation drive plate 765 to ensure operational accuracy. The isolation limiting plate 764 is welded. The isolation drive plate 765 is fixedly connected to the rear plate 74; the isolation drive plate 765 is fixedly installed on the isolation operation shaft 761 and is located close to the rear plate 74. The isolation drive plate 765 is fixedly provided with a pin 766, and the isolation drive plate 765 is coupled to the isolation limit plate 764 through the pin 766; the isolation toggle pin 767 is fixedly installed on the isolation drive plate 765, and the rear plate 74 is provided with an isolation drive groove 768 that is adapted to the isolation toggle pin 767. The isolation toggle pin 767 passes through the isolation drive groove 768 and can slide along the isolation drive groove 768.

[0086] During operation, rotating the isolation operating shaft 761 causes the isolation crank arm 762 to move the crank arm actuation pin 763, and the isolation drive plate 765 rotates synchronously. The isolation actuation pin 767 slides in the isolation drive groove 768, pushing the moving contact of the external negative three-position switch to move, forming an air gap and realizing physical isolation of the circuit.

[0087] like Figures 14-19As shown, the grounding operation unit 77 can include a grounding operation shaft 771, a grounding crank arm 772, a grounding limiting plate 774, a grounding driving plate 775 and a grounding push pin 777. The grounding operation shaft 771 is connected to the front plate 73 and the rear plate 74 through the shaft sleeve 756, and one end of the grounding operation shaft 771 extends outward to the outside of the front plate 73. The grounding crank arm 772 is fixedly installed on the grounding operation shaft 771, and a crank arm push pin two 773 is fixedly installed on the grounding crank arm 772. The grounding limiting plate 774 is installed on the rear plate 74 and located in the cavity, and is used to limit the rotation range of the grounding driving plate 775 to ensure the operation accuracy. The grounding limiting plate 774 is fixedly connected to the rear plate 74 by welding. The grounding driving plate 775 is fixedly installed on the grounding operation shaft 771 and located close to the rear plate 74. The grounding driving plate 775 is provided with a pin column two 776. The grounding push pin 777 is fixedly installed on the grounding driving plate 775. The rear plate 74 is provided with a grounding driving groove 778 matched with the grounding push pin 777. The grounding push pin 777 passes through the grounding driving groove 778 and can slide along the grounding driving groove 778.

[0088] During operation, the grounding operation shaft 771 is rotated, the grounding crank arm 772 drives the crank arm push pin two 773 to move, the grounding driving plate 775 is synchronously rotated, the grounding push pin 777 slides in the grounding driving groove 778, and the movable contact of the three-position switch is connected with the grounding end to realize circuit grounding.

[0089] As shown in Figures 14-19 The energy storage spring unit 78 can include a spring guide shaft 781, a closing and opening spring 782 and a pad sleeve 783. The two ends of the spring guide shaft 781 are hingedly connected to the isolation crank arm 762 and the grounding crank arm 772 through pin shafts respectively. The closing and opening spring 782 is sleeved on the spring guide shaft 781. The pad sleeve 783 is provided with two and is sleeved on the spring guide shaft 781. The closing and opening spring 782 is located between the two pad sleeves 783 to ensure the stability when the closing and opening spring 782 is compressed. The spring guide shaft 781 is a double telescopic guide shaft.

[0090] When the isolation operation unit 76 or the grounding operation unit 77 operates, the spring guide shaft 781 is pushed to move, and the closing and opening spring 782 is compressed to store energy. After the operation is completed, the closing and opening spring 782 releases energy to buffer mechanical impact, while ensuring accurate reset and improving operation reliability.

[0091] A limiting plate 784 that cooperates with the crank arm actuating pin 773 is also fixedly installed on the grounding operating shaft 771 to limit the rotation angle of the grounding operating shaft 771 and prevent over-position operation; an interlocking plate 785 is installed between the grounding operating shaft 771 and the isolating operating shaft 761 to connect the grounding operating shaft 771 and the isolating operating shaft 761 to form a mechanical interlock to ensure the operation sequence of "opening the circuit breaker first, then opening the isolating switch (three-position switch)" and prevent opening and closing under load.

[0092] like Figures 14-19 As shown, connecting unit 1 79 is distributed at the four corners of the front plate 73 and the rear plate 74. Connecting unit 1 79 includes a limiting sleeve 791 and a connecting bolt 792. Connecting holes are provided on the front plate 73 and the rear plate 74. The connecting bolt 792 passes through the connecting hole and the limiting sleeve and is locked and fixed by a nut. The limiting sleeve is located between the front plate 73 and the rear plate 74. Connecting unit 2 has the same structure as connecting unit 1. Connecting holes are provided on the front plate 73 and the gear fixing plate 7904. The connecting bolt passes through the connecting hole and the limiting sleeve and is locked and fixed by a nut. The limiting sleeve is located between the front plate 73 and the gear fixing plate 7904.

[0093] According to an embodiment of the present invention, the top-in, top-out, back-connected ring main unit has a double-through bushing seat located above the cable compartment and connected to the gas box. The inner end of the double-through bushing seat is connected to a three-position switch, thus forming a top-in, top-out, back-connected ring main unit. Compared with the traditional bottom-in, bottom-out ring main unit, the distance between the double-through bushing seat and the bottom of the cable compartment is longer, resulting in a longer wiring path, more operating space, and significantly reduced wiring difficulty. Furthermore, the ring main unit structure of the present invention inherently possesses anti-condensation characteristics. On the one hand, the secondary compartment, mechanism compartment, and cable compartment of the ring main unit are not on the same side; thus, the secondary compartment and mechanism compartment are structurally and technologically designed to be independent and enclosed spaces, preventing the entry of humid gases and making condensation difficult to form. On the other hand, a layer of special material felt is laid on the top of the mechanism compartment and secondary compartment, making the possibility of condensation negligible. Therefore, the ring main unit of the present invention does not require the installation of such electrical anti-condensation equipment.

[0094] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, various modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A top-in top-out back-to-back ring main unit, characterized in that, The utility model relates to a kind of circuit breaker cabinet, including: Support mechanism; Cabinet body, installed on support mechanism, cabinet body includes mutually independent cable chamber, gas tank, mechanism chamber, instrument room and secondary room;Cable chamber and gas tank, mechanism chamber, instrument room and secondary room are set as front and back heterolateral as a whole, wherein, cable chamber is set in the back of cabinet body, gas tank and mechanism chamber are set in the upper of secondary room, gas tank is in vacuum state, between mechanism chamber and cable chamber, and a certain interval is left between the top of gas tank and the inner wall of cabinet body;Instrument room is set in the upper of mechanism chamber; Circuit breaker mechanism, including fixed frame, vacuum circuit breaker and three-position switch;Wherein, fixed frame is fixed on the inner side wall of gas tank;Vacuum circuit breaker is installed on fixed frame;Three-position switch is installed on fixed frame, and three-position switch is arranged in the upper of vacuum circuit breaker; Circuit breaker module, installed in mechanism chamber, circuit breaker module is connected with vacuum circuit breaker; Manual voltage isolation module, manual voltage isolation module is connected with three-position switch, wherein, manual voltage isolation module is located in the upper of circuit breaker module; Five-proof interlocking mechanism, installed on manual voltage isolation module and cabinet body, for controlling the opening or closing of cable chamber door plate; Multiple sets of double-pass sleeve pipe bases, installed on the upper end of gas tank, correspond with three-position switch, the outer end is located in the upper of cable chamber, the inner end is located in gas tank, cable is connected to the outer end of double-pass sleeve pipe base from the bottom of support mechanism through cable chamber, and the inner end of double-pass sleeve pipe base is connected with three-position switch; Manual voltage isolation module includes: Front plate and back plate, front plate and back plate are arranged in parallel between the cavity, and front plate and back plate are connected by connecting unit one; Opening and closing operation unit, through the cavity and installed on front plate and back plate, and connected with three-position switch, for realizing the separation or closure of moving contact and static contact of three-position switch; Isolation operation unit, through the cavity and installed on front plate and back plate; Grounding operation unit, through the cavity and installed on front plate and back plate; Energy storage spring unit, both ends are connected with isolation operation unit and grounding operation unit respectively; Magnetic blow unit, installed on the opening and closing operation shaft of opening and closing operation unit; Magnetic blow unit includes sector gear two, magnetic blow gear and magnetic blow switch;Sector gear two is fixedly installed on the opening and closing operation shaft of opening and closing operation unit;Magnetic blow gear is rotatably installed on front plate by gear shaft two, and gear shaft two extends to the outside of front plate;Magnetic blow gear is engaged with sector gear two;Magnetic blow switch is installed on gear shaft two located outside front plate; Magnetic blow unit further includes two travel switches installed on front plate and matched with magnetic blow switch.

2. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, Mechanism chamber and secondary room top are laid with a layer of felt.

3. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, Support mechanism includes: Base, frame structure; Support plate, installed on base, support plate is provided with incoming line port corresponding to cable chamber; Crossbeam, installed at incoming line port, connecting hole is formed in crossbeam, lock nut is installed on the inner side of crossbeam at connecting hole; Hoop, hoop is installed on crossbeam through inner hexagonal bolt, connected with lock nut, hoop cooperates with crossbeam to fix cable.

4. The top-in top-out back-to-back network cabinet according to claim 2, characterized in that, The bottom of the cable chamber is provided with a wire hole at the incoming wire port position, and a zero sequence current transformer is installed at the wire hole in the cable chamber.

5. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, The side of the gas tank is provided with a side expansion bushing connected with the vacuum circuit breaker through a copper bar, and the side expansion bushing is detachably provided with a side expansion cover.

6. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, The gas tank is connected with a gas pressure gauge through a pipeline, and the gas pressure gauge is installed on the door of the mechanism chamber.

7. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, The five-prevention interlocking mechanism comprises: A cam is installed on the isolation ground operation shaft of the manual voltage isolation module; A support plate is installed on the manual voltage isolation module and above the cam; A guide unit comprises a guide sleeve, a guide rod and a spring, a connecting hole is formed in the support plate, the guide sleeve is fixedly connected in the connecting hole, the guide rod is matched with the guide sleeve and is slidingly connected in the guide sleeve, the bottom end of the guide rod is connected with a limiting plate, and the spring is sleeved on the guide rod and located between the guide sleeve and the limiting plate; A fixing seat is installed on the support plate; A locking unit comprises a locking rod and a locking piece, the locking rod is installed on the top of the cabinet through a bearing with a seat, the locking rod is above the gas tank, the locking piece is installed on the end of the locking rod away from the interlocking unit, and is used for locking the door plate; An interlocking unit comprises a plurality of locking arms, the locking arms are hingedly connected, the locking arm at the first end is fixedly connected with the top end of the guide rod, the locking arm at the last end is fixedly connected with one end of the locking rod, and the locking arm hingedly connected with the first end locking arm is rotationally connected with the fixing seat.

8. The top-in top-out back-to-back network cabinet according to claim 7, characterized in that, At least two partitions are arranged in the cable chamber, and the cable chamber is divided into cable chamber one and cable chamber two through the partitions, the door plate is rotationally arranged on the cable chamber one and the cable chamber two, and the door plate is provided with a lock hole corresponding to the locking piece.

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