Upper-inlet and upper-outlet back connection type ring main unit

Abstract

The invention provides an upper-inlet and upper-outlet back connection type ring main unit, which relates to the technical field of ring main units and 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 a plurality of groups of two-way sleeve seats. The two-way sleeve seat is arranged at the rear upper part of the gas tank, the inner end of the two-way sleeve seat is connected with the three-position switch, and the outer end of the two-way sleeve is used for accessing a high-voltage cable of a user; compared with a traditional lower-in lower-out ring main unit, the upper-in upper-out back connection type ring main unit has the advantages that the distance between the two-way sleeve seat and the bottom of the cable chamber is longer, so that the wiring installation work of a high-voltage cable of a user is more convenient; in addition, as the secondary chamber, the mechanism chamber and the cable chamber of the ring main unit are respectively arranged at two sides of the gas box, 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 cable trench at the lower part, so that humid gas cannot enter the cable trench, and condensation is difficult to form.

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 conventional 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 side louvers, and 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, comprising: a support mechanism; a cabinet body installed on the support mechanism, the cabinet body comprising 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 at 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 comprising 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] Further, a layer of felt is laid on the top of the mechanism chamber and the secondary chamber.

[0007] Furthermore, the support mechanism includes: a base, which has a frame structure; a support plate, which is installed on the base and has an inlet corresponding to the cable compartment; a crossbeam, which is installed at the inlet and has a connection hole, with a locking nut installed on the inner side of the crossbeam at the connection hole; and a clamp, which is installed on the crossbeam by means of hexagonal bolts and connected to the locking nut, and the clamp and the crossbeam cooperate to fix the cable.

[0008] Furthermore, a wire hole is provided at the bottom of the cable compartment at the inlet position. A zero-sequence current transformer is installed in the cable compartment at the wire hole. The cable passes through the inlet, clamp, wire hole and zero-sequence current transformer in sequence from the bottom of the base and is connected to the outer end of the double-pass bushing through the cable joint.

[0009] Furthermore, a side expansion sleeve is installed on the side of the gas box. The side expansion sleeve is connected to the vacuum circuit breaker through a copper busbar. A side expansion cover is detachably installed on the side expansion sleeve. An opening is provided on the cabinet corresponding to the position of the side expansion sleeve.

[0010] Furthermore, a pressure gauge is connected to the air box via a pipeline, and the pressure gauge is installed on the door of the mechanism room.

[0011] Furthermore, the five-proof interlocking mechanism includes: a cam, which is mounted on the isolation grounding operating shaft of the manual voltage isolation module; a support plate, which is mounted on the manual voltage isolation module and located above the cam; a guide unit, which includes a guide sleeve, a guide rod, and a spring, with a connecting hole on the support plate, the guide sleeve being fixedly connected in the connecting hole, the guide rod being adapted to the guide sleeve and slidably connected in the guide sleeve, a limit plate being connected to the bottom end of the guide rod, and the spring being sleeved on the guide rod and located between the guide sleeve and the limit plate; a fixed seat, which is mounted on the support plate; and a locking unit, which includes an interlocking rod and a locking plate. The rod is mounted on the top of the cabinet via a bearing seat. The interlocking rod is located above the air box. The locking plate is mounted on the end of the interlocking rod away from the interlocking unit to lock the door panel. The interlocking unit includes multiple locking arms that are hinged together. The locking arm at the first end is fixedly connected to the top of the guide rod, and the locking arm at the last end is fixedly connected to one end of the interlocking rod. The locking arm hinged to the first locking arm is rotatably connected to the fixed base. The rotation of the cam drives the guide unit to move linearly. The guide unit controls the action of the interlocking unit, and the interlocking unit controls the rotation of the locking unit to open and close the door panel.

[0012] Furthermore, the cable compartment is provided with at least two partitions, which divide the cable compartment into two independent cable compartments, namely cable compartment one and cable compartment two. Cable compartment one and cable compartment two are equipped with rotating door panels, and the door panels are provided with lock slots corresponding to the lock plates.

[0013] Furthermore, the manual voltage isolation module includes: a front plate and a rear plate, which are arranged in parallel to form a cavity, and the front plate and the rear plate are connected in one phase by a connecting unit; a circuit breaker operation unit, which passes through the cavity and is installed on the front plate and the rear plate, and is connected to the three-position switch, for realizing the separation or closure of the moving contact and the stationary contact of the three-position switch; an isolation operation unit, which passes through the cavity and is installed on the front plate and the rear plate; a grounding operation unit, which passes through the cavity and is installed on the front plate and the rear plate; an energy storage spring unit, whose two ends are respectively connected to the isolation operation unit and the grounding operation unit; and a magnetic blow unit, which is installed on the circuit breaker operation shaft of the circuit breaker operation unit.

[0014] The beneficial effects of this invention are:

[0015] (1) The present invention is a top-in and top-out back-connected ring main unit. The double-through bushing is set above the cable compartment and connected to the air box. The inner end of the double-through bushing is connected to the three-position switch, thus forming a top-in and top-out back-connected ring main unit. Compared with the traditional bottom-in and bottom-out ring main unit, the distance between the double-through bushing and the bottom of the cable compartment is longer. Therefore, the wiring path is longer and the operating space is larger, which greatly reduces the wiring difficulty.

[0016] (2) The ring main unit has an 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 can be made into independent and enclosed spaces in terms of structure and process, and humid gas cannot enter, so 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 the secondary chamber, and the possibility of condensation is extremely low. Therefore, the ring main unit of the present invention does not need to be equipped with such electrical anti-condensation equipment.

[0017] (3) The gas box is filled with sulfur hexafluoride and has the characteristics of full insulation, full sealing, full filling and full shielding;

[0018] (4) By setting up a support mechanism, while supporting the cabinet, the cables are fixed to the base by using the clamps and crossbeams, which makes it more convenient and secure to fix the cables.

[0019] (5) Through the five-proof connection mechanism, the mechanical interlock ensures that the door panel status and the disconnect switch operation status are interlocked, so that the disconnect switch is in a safe state when the door panel is opened, while allowing the operator to operate the disconnect switch normally, thus achieving a balance between safety and convenience; at the same time, since the interlock is not an electrical control, the mechanical interlock is not affected by power supply or electrical component failures.

[0020] (6) The manual voltage isolation module is composed of a front plate and a rear plate to form a cavity frame, and is internally integrated with a closing and opening operation unit, an isolation operation unit, a grounding operation unit and an energy storage spring unit, each unit is linked through mechanical structures such as shaft sleeves, gears and crank arms, so as to realize the closing and opening control, circuit isolation and grounding operation of the three-position switch, and the control structure is simple, and meanwhile, the operation stability is improved through the energy storage spring unit. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic view of the up-approaching and up-approaching back contact type ring main unit of the embodiment of the present application;

[0022] Figure 2 It is a structure schematic view of the up-approaching and up-approaching back contact type ring main unit of one embodiment of the present application;

[0023] Figure 3 It is a front internal structure schematic view of the up-approaching and up-approaching back contact type ring main unit of one embodiment of the present application;

[0024] Figure 4 It is a back internal structure schematic view of the up-approaching and up-approaching back contact type ring main unit of one embodiment of the present application;

[0025] Figure 5 It is an internal structure schematic view of the up-approaching and up-approaching back contact type ring main unit of one embodiment of the present application Figure 1 ;

[0026] Figure 6 It is an internal structure schematic view of the up-approaching and up-approaching back contact type ring main unit of one embodiment of the present application Figure 2 ;

[0027] Figure 7 It is an internal structure schematic view of the up-approaching and up-approaching back contact type ring main unit of one embodiment of the present application Figure 3 ;

[0028] Figure 8 It is a structure schematic view of a supporting mechanism of one embodiment of the present application;

[0029] Figure 9 It is an installation schematic view of the up-approaching and up-approaching back contact type ring main unit of one embodiment of the present application;

[0030] Figure 10 It is a structure schematic view of a five-prevention interlocking mechanism of one embodiment of the present application;

[0031] Figure 11 It is a structure schematic view of a cam, a supporting plate, a guide assembly, a fixing seat and a locking assembly of one embodiment of the present application;

[0032] Figure 12 It is a connection schematic view of the five-prevention interlocking mechanism and a door plate of one embodiment of the present application;

[0033] Figure 13 Structure diagram of the locking assembly of one embodiment of the present application;

[0034] Figure 14 Structure diagram of the manual voltage isolation switch one / manual voltage isolation switch two of one embodiment of the present application;

[0035] Figure 15 Structure diagram of the manual voltage isolation switch one / manual voltage isolation switch two of one embodiment of the present application;

[0036] Figure 16 Structure diagram of the manual voltage isolation switch one / manual voltage isolation switch two of one embodiment of the present application;

[0037] 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 of one embodiment of the present application Figure 1 ;

[0038] 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 of one embodiment of the present application Figure 2 ;

[0039] Figure 19 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 of one embodiment of the present application Figure 2 .

[0040] Explanation of reference signs:

[0041] 10 - support mechanism, 11 - base, 12 - support plate, 13 - crossbeam, 14 - hoop.

[0042] 20 - cabinet body, 21 - cable chamber, 211 - zero sequence current transformer, 212 - partition, 213 - cable chamber one, 214 - cable chamber two, 215 - door plate, 216 - lock opening, 22 - air tank, 221 - side expansion sleeve, 222 - side expansion cover, 223 - air pressure gauge, 23 - mechanism chamber, 24 - instrument chamber, 25 - secondary chamber;

[0043] 30 - double-pass sleeve seat;

[0044] 40 - circuit breaker mechanism, 41 - vacuum circuit breaker, 42 - three-position switch, 43 - fixed frame;

[0045] 60 - circuit breaker module;

[0046] 70 - manual voltage isolation module, 73 - front plate, 74 - rear plate;

[0047] 75 - opening and closing operation unit, 751 - opening and closing operation shaft, 752 - operation handle, 753 - sector gear one, 754 - opening and closing gear, 755 - gear shaft one, 756 - shaft sleeve;

[0048] 76 - isolation operation unit, 761 - isolation operation shaft, 762 - isolation crank, 763 - crank push pin one, 764 - isolation limiting plate, 765 - isolation drive plate, 766 - pin column one, 767 - isolation push pin, 768 - isolation drive slot;

[0049] 77 - grounding operation unit, 771 - grounding operation shaft, 772 - grounding crank, 773 - crank push pin two, 774 - grounding limiting plate, 775 - grounding drive plate, 776 - pin column two, 777 - grounding push pin, 778 - grounding drive slot;

[0050] 78 - energy storage spring unit, 781 - spring guide shaft, 782 - opening and closing spring, 783 - pad sleeve, 784 - limiting plate one, 785 - interlocking plate;

[0051] 790 - magnetic blowout unit, 7901 - sector gear two, 7902 - magnetic blowout gear, 7904 - gear fixing plate, 7905 - magnetic blowout switch, 7906 - travel switch;

[0052] 79 - connection unit one, 791 - limiting sleeve, 792 - connecting bolt;

[0053] 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 DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0055] As shown in the drawings, Figures 1-19 An up-in and up-out back contact type ring main unit in an embodiment of the present application includes a supporting 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 a plurality of double-through bushing seats 30.

[0056] AsFigures 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.

[0057] It's important to understand that traditional bottom-in / bottom-out ring main units have a short distance between the bushing and the bottom of the cable compartment, resulting in limited operating space when wiring cables. Workers must frequently bend over and stoop when connecting cables to the bushing, increasing the difficulty of installation and maintenance and potentially affecting wiring quality due to the limited operating space. Furthermore, outdoor ring main units are often located in humid environments, and the area below the cable compartment, close to the ground, easily accumulates moisture. Because of the short wiring distance and thick cables, the cables are often cut and segmented for easier wiring. It's difficult to completely seal the connection points (the openings created by cutting the cables are located below the cable compartment). Moisture can gradually penetrate into the cable through these unsealed or poorly sealed areas. Once moisture enters, it forms a water film within the insulation layer, reducing insulation resistance, leading to decreased insulation performance and electrical faults.

[0058] The ring main unit of this invention adopts a "front and back opposite sides" layout design. The cable compartment is independently located at the back of the cabinet and is the main area that may come into contact with external humid gases (such as moisture from underground cable trenches and moisture after outdoor rainwater evaporation). The secondary compartment and mechanism compartment are located at the front of the cabinet and are not on the same side as the cable compartment. In terms of structure and process, they can form independent closed spaces (such as through sealing door panels and sealing treatment at joints).

[0059] This physical isolation makes it difficult for humid gases to enter the secondary chamber and the mechanism chamber, reducing the possibility of humid air condensing in these areas (it should be understood that condensation requires sufficient humid gases in the space).

[0060] like Figures 5-6 As shown, the circuit breaker mechanism 40 includes a fixed frame 43, a vacuum circuit breaker 41, and a three-position switch 42; wherein, the fixed frame 43 is fixed on the inner wall of the gas box 22; the vacuum circuit breaker 41 is mounted on the fixed frame 43; the three-position switch 42 is mounted on the fixed frame 43 and is arranged above the vacuum circuit breaker 41, and the three-position switch 42 and the vacuum circuit breaker 41 are connected by a copper busbar.

[0061] 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 driving shaft of the vacuum circuit breaker 41. The circuit breaker module is a core execution component for controlling the switching action of the vacuum circuit breaker, and its structure and principle are based on mature high-voltage switch control technology, including a transmission component and the like, which 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 here.

[0062] The manual voltage isolation module 70 is in transmission connection with the three-position switch 42, and the manual voltage isolation module 70 is located above the circuit breaker module 60.

[0063] 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.

[0064] 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, the outer end of the double-pass bushing base 30 is located above the cable chamber 21, and the inner end is located in the gas tank 22. The cable passes through the cable chamber 21 from the bottom of the support mechanism 10 and is connected to the outer end of the double-pass bushing base 30, and the inner end of the double-pass bushing base 30 is in electrical connection with the three-position switch 42.

[0065] 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.

[0066] The gas tank is a sealed welded structure, and the gas tank is filled with sulfur hexafluoride gas, which has excellent insulation performance (2.5 times the insulation strength of air) and arc extinguishing ability, to ensure the insulation reliability of the high-voltage components (vacuum circuit breaker, three-position switch) in the gas tank. The material of the gas tank 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.

[0067] The "inner end" of the double-pass bushing seat extends into the gas tank, and the outer shell is made of insulating material (such as porcelain or composite insulating material) to insulate and isolate 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.

[0068] In one embodiment of the present application, a layer of felt (such as wool felt, synthetic fiber felt, etc.) is applied to the top of the mechanism chamber 23 and the secondary chamber 25. The felt has good adsorption properties and can absorb a small amount of residual moisture in the space, reducing air humidity. At the same time, the felt can provide some thermal insulation, reducing the risk of localized cooling caused by excessive temperature difference between the inside and outside of the chamber, and preventing moisture from condensing due to sudden temperature drop.

[0069] As shown in Figure 8 and Figure 9 , in one embodiment of the present application, the support mechanism 10 includes a base, a support plate 12, a crossbeam 13, and a clamp 14. The base has a frame structure. The support plate 12 is installed on the base, and the support plate 12 has a wire inlet port corresponding to the cable chamber 21. The crossbeam 13 is installed at the wire inlet port, and the crossbeam 13 has a connecting hole. A locking nut is installed on the inner side of the crossbeam 13 at the connecting hole. The clamp 14 is installed on the crossbeam 13 by means of an internal hexagonal bolt and is connected to the locking nut. The clamp 14 cooperates with the crossbeam 13 to fix the cable.

[0070] As shown in Figure 4 and Figure 8 , in one embodiment of the present application, the bottom of the cable chamber 21 has a wire hole at the position of the wire inlet port. A zero-sequence current transformer 211 is installed in the cable chamber 21 at the wire hole. The cable passes through the wire inlet port, the clamp 14, the wire hole, and the zero-sequence current transformer 211 in sequence from the bottom of the base and is connected to the outer end of the double-pass bushing seat 30 through a cable joint.

[0071] In one embodiment of the present application, the side of the gas tank 22 is provided with a side expansion sleeve 221, which is connected to the vacuum circuit breaker 41 through a copper bar. A side expansion cover 222 is detachably installed on the side expansion sleeve 221. The cabinet 20 has an opening one corresponding to the position of the side expansion sleeve 221.

[0072] As shown in Figure 3 , in one embodiment of the present application, the gas tank 22 is connected to a pressure gauge 223 through a pipeline. The pressure gauge 223 is installed on the door of the mechanism chamber 23. The pressure gauge 223 can monitor the internal pressure of the gas tank 22 in real time and provide early warning in case of leakage (pressure below threshold value).

[0073] As shown in Figure 3 , Figure 10 , Figure 11 ,Figure 12 and Figure 13 As shown, in one embodiment of the present invention, the five-proof interlocking mechanism 80 includes a cam 81, a support plate 82, a guide unit 83, a fixed seat 84, a locking unit 85, and an interlocking unit 86. The cam 81 is mounted on the isolation grounding operation shaft 771 of the manual voltage isolation module 70; the support plate 82 is mounted on the manual voltage isolation module 70 and located above the cam 81; the guide unit 83 includes a guide sleeve 831, a guide rod 832, and a spring 833. A connecting hole is provided on the support plate 82, the guide sleeve 831 is fixedly connected in the connecting hole, the guide rod 832 is adapted to the guide sleeve 831 and slidably connected in the guide sleeve 831, the bottom end of the guide rod 832 is connected to a limit plate, and the spring 833 is sleeved on the guide rod 832, located between the guide sleeve 831 and the limit plate; the fixed seat 84 is mounted on the support plate 82; and the locking unit 85 is interlocked with the locking unit 86. The unit 85 includes a chain rod 851 and a locking plate 852. The chain rod 851 is mounted on the top of the cabinet 20 via a bearing 853. The chain rod 851 is located above the air box 22. The locking plate 852 is mounted on the end of the chain rod 851 away from the chain unit 86 and is used to lock the door panel 215. The chain unit 86 includes multiple locking arms 861, which are hinged to each other. The locking arm 861 at the first end is fixedly connected to the top of the guide rod 832, and the locking arm 861 at the end is fixedly connected to one end of the chain rod 851. The locking arm 861 that is hinged to the locking arm 861 at the first end is rotatably connected to the fixed seat 84.

[0074] In this embodiment of the invention, the cam 81 rotates to drive the guide unit 83 to move linearly, the guide unit 83 controls the interlocking unit 86 to move, and the interlocking unit 86 controls the locking unit 85 to rotate, thereby realizing the opening and closing of the door panel 215.

[0075] like Figure 7 As shown, in one embodiment of the present invention, the cable compartment 21 is provided with at least two partitions 212, which divide the cable compartment 21 into two independent cable compartments 213 and 214. The cable compartments 213 and 214 are provided with door panels 215, and the door panels 215 are provided with lock slots 216 corresponding to the lock plate 852.

[0076] Specifically, the cable compartment 21 is provided with two partitions 212, which divide the cable compartment 21 into two cable compartments 213 and one cable compartment 214; therefore, corresponding to cable compartments 213 and cable compartment 214, the double-through bushing 30 is provided with three sets.

[0077] like 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.

[0078] 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 closure 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.

[0079] 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.

[0080] 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 is fixedly connected to a gear shaft one 755, 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, and 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.

[0081] 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.

[0082] As shown in FIG. 7, 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 is fixedly connected to a gear shaft two, which 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 79, 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.

[0083] As shown in FIG. 7, 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.

[0084] 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.

[0085] 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.

[0086] like Figures 14-19As shown, the ground operation unit 77 can include a ground operation shaft 771, a ground crank arm 772, a ground limiting plate 774, a ground driving plate 775 and a ground push pin 777. Among them, the ground operation shaft 771 is connected with the front plate 73 and the rear plate 74 through the shaft sleeve 756, and one end of the ground operation shaft 771 extends outward to the outside of the front plate 73; the ground crank arm 772 is fixedly installed on the ground operation shaft 771, and the crank arm push pin two 773 is fixedly installed on the ground crank arm 772; the ground limiting plate 774 is installed on the rear plate 74 and located in the cavity, and the ground limiting plate 774 is used to limit the rotation range of the ground driving plate 775, and ensure the operation accuracy, wherein the ground limiting plate 774 is fixedly connected with the rear plate 74 by welding; the ground driving plate 775 is fixedly installed on the ground operation shaft 771 and close to the rear plate 74, and the pin column two 776 is arranged on the ground driving plate 775; the ground push pin 777 is fixedly installed on the ground driving plate 775, and the ground driving groove 778 matched with the ground push pin 777 is arranged on the rear plate 74, and the ground push pin 777 passes through the ground driving groove 778 and can slide along the ground driving groove 778.

[0087] During operation, the ground operation shaft 771 is rotated, the ground crank arm 772 drives the crank arm push pin two 773 to move, the ground driving plate 775 rotates synchronously, the ground push pin 777 slides in the ground driving groove 778, and the movable contact of the three-position switch is connected with the ground end to realize circuit grounding.

[0088] As shown in the figure, 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. Among them, the both ends of the spring guide shaft 781 are hinged with the isolation crank arm 762 and the ground crank arm 772 through the pin shaft respectively; the closing and opening spring 782 is sleeved on the spring guide shaft 781; the pad sleeve 783 is provided with two, which is sleeved on the spring guide shaft 781, and 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. Among them, the spring guide shaft 781 adopts a double telescopic guide shaft.

[0089] When the isolation operation unit 76 or the ground operation unit 77 operates, the spring guide shaft 781 is pushed to move, 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, at the same time, ensures the reset accuracy and improves the operation reliability.

[0090] The ground operation shaft 771 is also fixedly provided with a limiting plate 784 matched with the second toggle lever pushing pin 773, which limits the rotating angle of the ground operation shaft 771 to prevent over-positioning operation; and the interlocking plate 785 is arranged between the ground operation shaft 771 and the isolation operation shaft 761 to connect the ground operation shaft 771 and the isolation operation shaft 761, thereby forming mechanical interlocking to ensure the operation sequence of "first disconnecting the circuit breaker and then disconnecting the isolation switch (three-position switch)", and preventing the circuit breaker from being switched on or off under load.

[0091] As shown in Figures 14-19 The connecting unit 79 is arranged at the four corners of the front plate 73 and the rear plate 74, and the connecting unit 79 comprises a limiting sleeve 791 and a connecting bolt 792, the front plate 73 and the rear plate 74 are provided with connecting holes, the connecting bolt 792 passes through the connecting holes and is fixedly connected with the limiting sleeve through a nut, and the limiting sleeve is located between the front plate 73 and the rear plate 74; the connecting unit 79 is arranged at the four corners of the front plate 73 and the rear plate 74, and the connecting unit 79 comprises a limiting sleeve 791 and a connecting bolt 792, the front plate 73 and the rear plate 74 are provided with connecting holes, the connecting bolt 792 passes through the connecting holes and is fixedly connected with the limiting sleeve through a nut, and the limiting sleeve is located between the front plate 73 and the rear plate 74.

[0092] The upper-in upper-out back-connection type ring main unit according to the embodiment of the present application is characterized in that the 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 the upper-in upper-out back-connection type ring main unit. Compared with the conventional lower-in lower-out type ring main unit, the distance between the double-pass bushing seat and the bottom of the cable chamber is longer, so that the wiring path is longer and the operation space is larger, and the wiring difficulty is greatly reduced. In addition, the ring main unit has the inherent anti-condensation feature. On the one hand, the secondary chamber, the mechanism chamber and the cable chamber are not on the same side, so that the secondary chamber and the mechanism chamber are easy to realize the independent closed space in structure and process, and the humid gas cannot enter, so that it is difficult to form condensation. On the other hand, a layer of special material felt is arranged on the top of the mechanism chamber and the secondary chamber, so that the possibility of condensation is extremely small. Therefore, the ring main unit can completely not need to be additionally provided with such electrical anti-condensation equipment.

[0093] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0094] 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 five-proof interlocking mechanism and five-proof interlocking mechanism of circuit breaker, and the utility model relates to a kind of five-proof interlocking mechanism and five-proof interlocking mechanism of circuit breaker. It includes: Supporting mechanism; Cabinet body, installed on supporting mechanism, cabinet body includes cable chamber, gas tank, mechanism chamber, instrument room and secondary room independent of each other;The cable chamber is set to the whole of gas tank, mechanism chamber, instrument room and secondary room and is different side in front and back, wherein, cable chamber is set to the back of cabinet body, gas tank and mechanism chamber are set to 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 to 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; 2. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, Multiple sets of double-pass bushing seat, installed on the upper end of gas tank, correspond with three-position switch, the outer end is located in the upper of cable chamber, and the inner end is located in gas tank, cable is connected to the outer end of double-pass bushing seat from the bottom of supporting mechanism through cable chamber, and the inner end of double-pass bushing seat is connected with three-position switch.

3. 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. Supporting mechanism includes: Base, frame structure; Supporting plate, installed on base, supporting plate is equipped with incoming line port corresponding to cable chamber; Crossbeam, installed at incoming line port, crossbeam is provided with connecting hole, and lock nut is installed on the inner side of crossbeam at connecting hole; 4. The top-in top-out back-to-back network cabinet according to claim 2, characterized in that, Hoop, hoop is installed on crossbeam through inner hexagonal bolt, and is connected with lock nut, and hoop is fixed with cable in cooperation with crossbeam.

5. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, The bottom of cable chamber is provided with wire hole at incoming line port position, and zero sequence current transformer is installed in cable chamber at wire hole, and cable is connected with the outer end of double-pass bushing seat through cable joint from the bottom of base through incoming line port, hoop, wire hole and zero sequence current transformer.

6. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, Side expansion sleeve is installed on the side of gas tank, and is connected with vacuum circuit breaker through copper bar, and side expansion sleeve is detachably installed with side expansion cover, and cabinet body is provided with opening one corresponding to side expansion sleeve.

7. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, Gas pressure gauge is connected with gas tank through pipeline, and is installed on the door of mechanism chamber. Five-proof interlocking mechanism includes: Cam, cam is installed on the isolation ground operating shaft of manual voltage isolation module; Support plate, support plate is installed on manual voltage isolation module, and is located in the upper of cam; Guide unit, guide unit includes guide sleeve, guide rod and spring, connecting hole is formed in support plate, guide sleeve is fixedly connected in connecting hole, guide rod is matched with guide sleeve, and is slidably connected in guide sleeve, the bottom end of guide rod is connected with limiting plate, and spring is sleeved on guide rod and located between guide sleeve and limiting plate; Fixed seat, fixed seat is installed on support plate; The locking unit comprises a locking rod and a locking plate, the locking rod is installed on the top of the cabinet body through a bearing with a seat, the locking rod is above the gas tank, the locking plate is installed on the end of the locking rod away from the locking unit, and is used for locking the door plate; The locking unit comprises a plurality of locking arms, the plurality of 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 fixed seat.

8. The top-in top-out back-to-back network cabinet according to claim 7, characterized in that, The cable chamber is provided with at least two partitions, the cable chamber is divided into cable chamber one and cable chamber two which are independent of each other 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 the lock hole corresponding to the locking plate.

9. The top-in top-out back-to-back network cabinet according to claim 1, characterized in that, The manual voltage isolation module comprises: The front plate and the rear plate are arranged in parallel between the front plate and the rear plate to form a cavity, and the front plate and the rear plate are connected through a connecting unit one; The opening and closing 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; The isolation operation unit is arranged in the cavity and is installed on the front plate and the rear plate; The grounding operation unit is arranged in the cavity and is installed on the front plate and the rear plate; The energy storage spring unit is connected with the isolation operation unit and the grounding operation unit at both ends; The magnetic blow unit is installed on the opening and closing operation shaft of the opening and closing operation unit.

Images