Stud force-enhancing plug-in and pull-out device, plug-in and pull-out assembly and unit for low-voltage switchgear

Abstract

The present invention relates to a stud force-boosting plug-in device, a plug-in assembly and a unit for a low-voltage switch cabinet. The stud force-boosting plug-in device comprises a rotating part and a fixed part, wherein the rotating part and the fixed part are respectively a plug-in stud and a plug-in nut. The rotating part is axially limited and can be rotatably installed around its own axis on the rear end plate of the frame of the unit assembly for installing the main circuit connector, and the fixed part is fixedly installed on the isolation plate of the unit chamber. The above-mentioned stud force-boosting plug-in device is provided between the plug-in assembly and the unit chamber of the plug-in assembly unit, which is used to drive the plug-in assembly to enter or exit the connection position. The beneficial effects are: the stud force-boosting plug-in device can boost the force of the plug-in assembly, which is convenient and fast; it is fast and labor-saving for equipment manufacturing companies, and can be quickly maintained and installed for equipment users, realizing the complete technical feasibility of 100% non-stop maintenance, and the key is to achieve a reduction in the manufacturing material cost of the equipment manufacturing company and complete guarantee of personal safety.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage complete equipment, in particular to a stud force-enhancing plugging and pulling device, a plugging and pulling assembly and a unit for a low-voltage switch cabinet. Background Art

[0002] The pluggable circuit breaker of the fixed pluggable assembly unit is equipped with a base. The pluggable circuit breaker is inserted into the base. The base is connected to the busbar. The application goal of the connection structure principle is to perform maintenance without power outages. However, in actual operation, overheating failures may occur in both the base and the pluggable circuit breaker, which is difficult to avoid.

[0003] The technical principle of the connection structure of the plug-in circuit breaker inserted into the base is analyzed as follows: the base is fixed to the unit room isolation plate (also called the unit room backplane), the base input end is fixedly connected to the busbar through a hole, and the base output end is connected and led out with a copper busbar, supported by an insulator, and is used to connect the outgoing user cable. A transformer is also connected in series on the copper busbar.

[0004] When the plug-in circuit breaker is inserted into the base, the spring plugs of the base input and output wires are inserted and connected with the conductor on the back of the plug-in circuit breaker. The conductor on the back of the plug-in circuit breaker is fixed with screws. The base has 4 corresponding base nuts. The plug-in circuit breaker is screwed into the base nuts through 4 fixed long screws to fasten the plug-in circuit breaker and the base together. The plug-in circuit breaker is tightly attached to the base without any heat dissipation gap.

[0005] When it is necessary to unplug the plug-in circuit breaker, first loosen the four long fixing screws of the plug-in circuit breaker, and then pull it out manually. The 250A and 100A plug-in circuit breakers can be unplugged, but the spring plug of the 400A and 630A plug-in circuit breakers inserted into the base has a large plugging pressure, and there are only stress-bearing parts at both ends of the plug-in circuit breaker that can accommodate finger force. It is very difficult to unplug the 400A plug-in circuit breaker, and the 630A plug-in circuit breaker is difficult to unplug. There is basically no probability of pulling it out by hand. If tools are used to assist, because the incoming line end of the plug-in circuit breaker is energized, personal injury accidents have occurred in the industry.

[0006] When the base overheats and needs to be replaced, the power must be turned off and the connection between the incoming busbar and the base must be removed.

[0007] In practical applications, the overheating failure rate of the base is high for low-quality bases. Foreign brand bases are of high quality, but there are also cases of overheating failures during operation, which require power outages for replacement. The industry manufacturer's after-sales service has records of power outages for maintenance of operating failures, involving structural overheating failures of various brands.

[0008] When a plug-in circuit breaker overheats, in theory, it can be manually unplugged for replacement, and 100A and 250A switches can be manually unplugged while powered on, but in practice, 400A and 630A plug-in circuit breakers cannot be manually unplugged. Users also have to shut down the power to remove the isolation board of the unit room for maintenance. Pulling out the plug-in circuit breaker while powered on may cause personal injury, and safety cannot be 100% guaranteed.

[0009] The main reasons for overheating of plug-in circuit breakers are: the overlapping surface between the spring plug and the conductor is too small, causing the connector of the conductor to heat up, and the cross-section of the conductor on the back of the circuit breaker is too small, causing overheating.

[0010] Ten years ago, when plug-in circuit breakers were first used, industry customers believed that it was a non-stop maintenance technology. In reality, it was difficult to achieve 100% non-stop maintenance. In addition, in practice, the probability of power outages for overheating failures was relatively high, which proved that plug-in circuit breakers were difficult to achieve non-stop maintenance. Industry customers had insufficient understanding of this technical structure. Ten years later, industry customers realized that the existing fixed plug-in structure had many technical defects.

[0011] Since the fixed plug-in assembly unit of the plug-in circuit breaker connected to the base cannot achieve non-stop maintenance, the cost-effectiveness of the function of the plug-in circuit breaker connected to the base for non-stop maintenance is greatly weakened, and an unreliable fault-prone point is added. However, many users believe that the overheating failure rate of the brand base is low. However, from a technical perspective, any connection structure does not exclude the occurrence of failures. For example, the fixed connection of the circuit breaker is also a power outage for maintenance, but the connection reliability is lower than the probability of overheating failure of the fixed plug-in assembly unit of the plug-in circuit breaker inserted into the base. The design of the plug-in circuit breaker connected to the base is intended to be non-stop maintenance, and now in actual applications, individual failures are also power outages for maintenance. Any connection structure will have overheating failures. The definition of plug-in should be regarded as a design principle concept that guarantees 100% non-stop maintenance, but in practice, it is impossible to achieve 100% non-stop maintenance.

[0012] The average purchase price of a foreign brand base is between 3,000 and 3,500 yuan, and the domestic enterprise base is also between 2,000 and 2,500 yuan, but the overheating failure is higher than that of foreign brand bases. The overall cost of plug-in switchgear is lower than that of withdrawable switchgear, so the market for plug-in switchgear is large. In addition, the brand plug-in circuit breaker is supplemented with a separation trip coil device to prevent the circuit breaker from being pulled out in the closed state. When the circuit breaker is pulled out in the closed state, the separation function can be realized. One costs 125 yuan, and an average of 7 units of one device will increase the cost by 875 yuan. Regarding this function, as long as there is a closing interlocking cost of 6 yuan, this application function can be solved, but why not change it? Users believe that not using the separation trip coil device changes the brand design application function.

[0013] Plug-in switchgear is currently the mainstream power distribution equipment in the southwest and northwest regions, and has also been widely used in the south in the past two years. The leading companies in the switchgear industry have an annual sales volume of over 10,000 units, but when the user's equipment is running, the base overheats and failures occur from time to time, requiring power outages for maintenance, and the Party A users raise more questions. The leading companies in the switchgear industry are also helpless. The industry needs a main and auxiliary circuit removable plug-in structure technology application that can achieve non-stop maintenance while further reducing manufacturing costs and meeting the feasibility of structural application technology in accordance with the content of the GB7251 standard.

[0014] The applicant's patent application document CN211790382U discloses a main circuit body reversing plug and a main circuit connection structure. By aligning the interphase center of the main circuit connector with the interphase center of the circuit breaker, the main circuit connector can be connected to the circuit breaker without flipping. The applicant's patent application document CN114552472A discloses a main circuit connection structure, a removable plug-in assembly unit and a unit. Under the premise of shortening the circuit breaker connection distance H and reducing the unit depth, the main circuit connection and disconnection of the incoming busbar can be achieved through the unit and the plug-in assembly, which realizes non-stop maintenance.

[0015] The difficulty of technical innovation lies in: the plugging pressure of the 3-pole 630A main circuit connector cannot be less than 225N / 1 phase according to the JBT0323-2016 standard. One plug-in assembly uses 6 630A main circuit connectors, and the plug-in pressure is not less than 1350N. However, manual plugging and unplugging can only be less than 600N. In addition, the weight of the circuit breaker and the connecting copper busbar in the plug-in assembly structure, without a force-enhancing plug-in mechanism, it is impossible to manually insert and unplug the main circuit connector.

[0016] In the removable plug-in assembly unit in the patent application document CN114552472A, in order to achieve the correct alignment of the main and auxiliary circuit dynamic plug-ins with the busbar and the main and auxiliary circuit static plug-ins, it is necessary to arrange the rack bottom plate and guide rail device of the unit rack, and arrange a lever force-enhancing propulsion mechanism at the front of the rack bottom plate of the unit rack for force-enhancing propulsion. However, the market demand requires a plug-in assembly unit of the same type as the fixed plug-in assembly unit, and there is a structural requirement that the rack bottom plate and guide rail device cannot be arranged. The plug-in and pull-out of a single plug-in assembly with only the rear end plate of the rack has no structural support point, which involves the technical difficulties of correctly aligning the main and auxiliary circuit dynamic plug-ins with the busbar and the main and auxiliary circuit static plug-ins, as well as the technical difficulties of how to design the force-enhancing plug-in mechanism, and also involves the technical difficulties of ensuring the personal safety of operators during maintenance. Summary of the invention

[0017] The technical problem to be solved by the present invention is to provide a stud force-enhancing plugging and unplugging device, a plugging and unplugging assembly and a unit for a low-voltage switch cabinet to reduce costs.

[0018] The technical solution adopted by the present invention to solve its technical problems is: a stud force-enhancing plug-in and pull-out device for a low-voltage switch cabinet, comprising a rotating part and a fixed part, wherein the rotating part and the fixed part are specifically a plug-in stud and a plug-in nut with internal and external threads that can be sleeved on the plug-in stud, respectively; the rotating part is axially limited and can be rotatably installed around its own axis on the rear end plate of the rack of the unit assembly for installing the main circuit connector; the fixed part is fixedly installed on the isolation plate of the unit room; the rotating part has an operating head for operating the rotating part to rotate, the operating head is in an exposed state relative to the front side of the rear end plate of the rack, and is used to operate the rotating part to rotate through the operating head on the front side of the rear end plate of the rack.

[0019] It is further defined that when the rotating part is a plug-in stud and the fixing part is a plug-in nut, the plug-in stud includes an operating section, a limiting section and a threaded section arranged in sequence front and back, the threaded section has an external thread for cooperating with the internal and external threads of the plug-in nut, the front end of the operating section is an operating head, a limiting force bracket is installed on the back of the rear end plate of the rack, which is used to form an axial limiting cavity between the rear end plate of the rack and the limiting force bracket, the limiting section is a protruding structure, the plug-in stud is axially limited by the limiting section embedded in the axial limiting cavity, the limiting force bracket and the rear end plate of the rack both have through holes, and the threaded section and the operating section pass through the through holes on the limiting force bracket and the rear end plate of the rack respectively;

[0020] Alternatively, a limiting force bracket is installed on the front side of the rear end plate of the rack to form an axial limiting cavity between the rear end plate of the rack and the limiting force bracket, and the plug-in stud is axially limited by a limiting section embedded in the axial limiting cavity. Both the limiting force bracket and the rear end plate of the rack have through holes, and the threaded section and the operating section pass through the through holes on the rear end plate of the rack and the limiting force bracket respectively.

[0021] It is further defined that the position-limiting force bracket includes a U-shaped frame protruding in the middle and support legs on both sides of the U-shaped frame, the position-limiting force bracket is installed on the rear end plate of the rack through the support legs, and the through hole of the position-limiting force bracket is opened on the top plate of the U-shaped frame.

[0022] A plug-in assembly, specifically a plug-in assembly for a low-voltage switch cabinet, comprises a unit frame, the unit frame comprises a frame rear end plate for installing a main circuit connector, and a rotating part of the above-mentioned stud force-enhancing plug-in device is installed on the frame rear end plate.

[0023] A plug-in assembly unit, specifically a plug-in assembly unit for a low-voltage switch cabinet, includes a plug-in assembly and a unit chamber. The plug-in assembly includes a unit frame, and the unit frame includes a frame rear end plate for installing a main circuit connector. The above-mentioned stud force-enhancing plug-in device is provided between the plug-in assembly and the unit chamber, which is used to drive the plug-in assembly to enter or exit a connection position.

[0024] It is further defined that there are two stud force-enhancing plugging and pulling devices, which are respectively located on the left and right sides of the rear end plate of the rack.

[0025] It is further defined that the unit rack includes a rack rear end plate and a load-bearing support plate, which is directly or indirectly fixed to the rack rear end plate, and is located at the bottom of the front side of the rack rear end plate, and rollers are arranged on both sides of the bottom of the rack rear end plate, and rollers are also installed on the load-bearing support plate, and the rollers on the load-bearing support plate are located in the middle of the front relative to the rollers on both sides of the bottom of the rack rear end plate, and are used to support the plug-in assembly entering the unit room, and there is also a plug-in guide device between the plug-in assembly and the unit room, which is used to limit the left and right positions of the plug-in assembly entering the unit room. The number of rollers on the load-bearing support plate is more than one, and the plug-in assembly of the unit room is supported at multiple points to achieve balanced support.

[0026] It is further defined that a circuit breaker fixing bracket is fixed on the rear end plate of the rack for installing the circuit breaker, and the rear end of the load-bearing support plate is fixed on the circuit breaker fixing bracket.

[0027] It is further defined that the unit frame also includes a closing interlock base plate, which is fixed on the load-bearing support plate. The closing interlock base plate and the load-bearing support plate are an integral or split structure, and the closing interlock base plate is provided with a closing interlock hole for closing interlocking with the closing interlock hole on the unit room layer plate and the closing interlock rod mechanism on the switch shaft rod.

[0028] It is further defined that the plug-in guide device includes two limit brackets, which are respectively located on the left and right sides of the unit room isolation plate, and the limit brackets cooperate with the side surfaces of the plug-in assembly to limit the plug-in assembly between the limit brackets.

[0029] It is further defined that the bottom of the closing interlocking base plate and the unit chamber layer plate are provided with an upper hook plate and a lower hook plate which cooperate with each other up and down, and when the plug-in assembly enters the connection position, the upper hook plate and the lower hook plate are in a combined state of up and down hooking.

[0030] It is further defined that the plug-in assembly also includes a main circuit plug-in connection structure, which includes a circuit breaker and a main circuit connector. The circuit breaker is installed on a unit rack. There are two stud force-enhancing plug-in devices, which are located on the left and right sides of the rear end plate of the rack respectively. A protective isolation cover is installed on the incoming line side of the circuit breaker, and the stud force-enhancing plug-in device on the incoming line side is located on the outside of the protective isolation cover.

[0031] It is further defined that the plug-in assembly also includes a main circuit plug-in connection structure, which includes a circuit breaker and a main circuit connector. The circuit breaker is installed on a circuit breaker fixing bracket, and the main circuit connector is installed on the rear end plate of the rack. The phase centers of the connection terminals of the main circuit connectors of each phase on the incoming line side and the outgoing line side are arranged to correspond to the phase centers of the corresponding phases of the circuit breaker. The main circuit connectors of each phase on the incoming line side and the outgoing line side are connected one by one with the corresponding phases of the circuit breaker through connecting conductive rows arranged in layers from top to bottom, and the main circuit connector on the incoming line side is a non-body reversing main circuit connector or a main circuit body reversing connector.

[0032] It is further defined that the plug-in assembly unit is specifically a 1 / 2 plug-in assembly unit, the plug-in assembly is a 1 / 2 plug-in assembly, a power distributor is arranged at the rear of the unit chamber, and the 1 / 2 plug-in assembly is plugged in with the branch main circuit static plug-in on the power distributor through the branch main circuit dynamic plug-in.

[0033] The beneficial effect of the present invention is that the stud force-enhancing plugging and pulling device is arranged on the rear end plate of the frame to perform force-enhancing plugging and pulling of the plugging and pulling assembly.

[0034] The plugging and unplugging studs of the stud force-enhancing plugging and unplugging device cooperate with the plugging and unplugging nuts arranged in the unit chamber and the load-bearing support plate and rollers to balance and limit the plugging and unplugging assembly, thereby realizing the movable insertion and connection and withdrawal to isolation of the plugging and unplugging assembly.

[0035] The operation and installation of the stud force-enhancing plug-in and pull-out are as follows: the plug-in assembly enters the unit room, the upper and lower hook plates are hooked together, and the roller slides into the predetermined limit state of the unit room. The stud force-enhancing plug-in device, the main and auxiliary circuit dynamic plug-in and the busbar, and the main and auxiliary circuit static plug-in are correctly aligned. Use an operating tool (such as an electric tool clamping a hexagonal socket) to insert the operating head (such as a hexagonal screw head) of the plug-in stud, and perform a left-right cross-balance operation to screw the plug-in stud in the positive direction. The external thread of the plug-in stud engages with the internal thread of the plug-in nut, and the limit section is close to the force-enhancing limit load-bearing bracket to generate a force increase, which drives the plug-in assembly and the main and auxiliary circuit dynamic plug-in to move backward, and is inserted into place with the busbar and the main and auxiliary circuit static plug-in, and the unit door is closed, and the circuit breaker is closed.

[0036] When it is necessary to pull out the plug-in assembly to the isolation state, the circuit breaker is opened, the unit door is opened, and the operating tool (such as an electric tool holding a hexagonal socket) is used to insert the operating head (such as a hexagonal screw head) of the plug-in stud, and the plug-in stud is twisted in the opposite direction in a cross-balanced operation. The limit section of the plug-in stud is close to the rear end plate of the rack, generating a force increase, driving the plug-in assembly and the main and auxiliary circuit dynamic plug-in to move forward, and separate from the busbar and the main and auxiliary circuit static plug-in, completing the complete isolation of the main and auxiliary circuit connectors. The plug-in assembly is operated by the plug-in stud, and the connection and isolation operations only take 15 seconds, realizing fast plug-in and pull-out. For equipment manufacturing companies, it is fast to install and save labor, and for equipment users, it can be quickly maintained and installed, realizing the complete technical feasibility of 100% non-stop maintenance, and the key is to achieve the reduction of manufacturing material costs for equipment manufacturing companies and complete personal safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0038] Figure 1 1 is a diagram of a predetermined positioning state of a stud force-enhancing plugging and pulling device according to Embodiment 1 of the present invention;

[0039] Figure 2 1 is a diagram of a connection force-enhancing state of a stud force-enhancing plugging and extraction device according to Embodiment 1 of the present invention;

[0040] Figure 3 1 is a diagram of the pull-out force-enhancing state of the stud force-enhancing plug-in device of embodiment 1 of the present invention;

[0041] Figure 4 is a front view of the functional components on the rear end panel of the rack according to the first embodiment of the present invention;

[0042] Figure 5 is a rear view of the functional components on the rear end panel of the rack according to the first embodiment of the present invention;

[0043] Figure 6 is a layout diagram of rollers of the plug assembly of embodiment 1 of the present invention;

[0044] Figure 7 is a schematic structural diagram of a unit cell according to Embodiment 1 of the present invention;

[0045] Figure 8 1 is a schematic structural diagram of a plug-in assembly of a hidden protective isolation cover according to Embodiment 1 of the present invention;

[0046] Fig. 9 is a schematic diagram of the three-dimensional structure of the plug assembly of embodiment 1 of the present invention;

[0047] Fig.10 is a schematic diagram of the main view structure of the plug assembly of embodiment 1 of the present invention;

[0048] Fig.11 1 is a schematic diagram of the main view structure of the plug-in assembly unit in the open state of embodiment 1 of the present invention;

[0049] Fig.12 is a schematic diagram of the three-dimensional structure of the plug-in assembly unit in the open state of embodiment 1 of the present invention;

[0050] Fig.13 is a schematic diagram of operating the plug-in assembly unit of Embodiment 1 using an operating tool of the present invention;

[0051] Fig.14 is a schematic diagram of the three-dimensional structure of the plug-in assembly unit in the closed state of embodiment 1 of the present invention;

[0052] Fig.15 1 is a schematic diagram of the structure of the plug-in assembly unit in a closed state in a rear view according to Embodiment 1 of the present invention;

[0053] Fig.16 is a schematic diagram of a plug-in assembly in a closed state of embodiment 1 of the present invention being unable to enter a unit chamber;

[0054] Fig.17 is a schematic diagram of the plug-in assembly unit of Embodiment 1 of the present invention in an inserted and connected position;

[0055] Fig.18 is a schematic diagram of the plug-in assembly unit of Embodiment 1 of the present invention in a pulled-out isolation position;

[0056] Fig.19 1 is a schematic structural diagram of a plug-in switch cabinet of a plug-in assembly unit according to an application embodiment 1 of the present invention;

[0057] Fig. 20 1 is a schematic structural diagram of a plug-in assembly of a hidden protective isolation cover according to a fourth embodiment of the present invention;

[0058] Fig.21 is a front perspective view of a unit chamber of a 1 / 2 plug-in assembly unit of embodiment 5 of the present invention;

[0059] Fig. 22 is a rear perspective view of a unit chamber of a 1 / 2 plug-in assembly unit of embodiment 5 of the present invention;

[0060] Fig.23 is a front perspective view of a 1 / 2 plug-in assembly of embodiment 5 of the present invention;

[0061] Fig.24 It is a front perspective view of a 1 / 2 plug-in assembly of a hidden protective isolation cover according to Embodiment 5 of the present invention;

[0062] Fig.25is a rear perspective view of a 1 / 2 plug-in assembly of embodiment 5 of the present invention;

[0063] Fig.26 1 is a schematic structural diagram of a 1 / 2 plug-in assembly unit in an open door state according to Embodiment 5 of the present invention;

[0064] Fig. 27 is a schematic structural diagram of a 1 / 2 plug-in assembly unit in a closed state according to Embodiment 5 of the present invention;

[0065] Fig.28 is a front perspective view of a removable plug assembly according to embodiment 6 of the present invention;

[0066] Fig.29 is a rear perspective view of a removable plug assembly according to embodiment 6 of the present invention;

[0067] Fig.30 1 is a schematic structural diagram of a unit chamber of a removable plug assembly unit according to Embodiment 6 of the present invention;

[0068] Fig.31 is a schematic structural diagram of a removable plug-in assembly unit according to Embodiment 6 of the present invention;

[0069] Fig.32 is a front structural schematic diagram of a plug assembly unit according to Embodiment 7 of the present invention;

[0070] Fig.33 is a schematic diagram of the back structure of the plug assembly unit of embodiment 7 of the present invention;

[0071] In the figure, 1. rear end plate of the rack, 2. plug-in studs, 2-1. operating head, 2-2. limit section, 2-3. threaded section, 3. force-enhancing limit force-bearing bracket, 3-1. U-shaped frame, 3-2. support foot, 4. unit room isolation plate, 5. plug-in nut, 6. main circuit connector, 6-1. main circuit static plug-in, 6-2. non-main body reversing main circuit connector, 6-3. main circuit body reversing connector, 6-4. branch main circuit dynamic plug-in, 6-5. branch main circuit static plug-in, 7. circuit breaker, 8. auxiliary circuit dynamic plug-in, 8-1. branch auxiliary circuit dynamic plug-in, 9. roller, 10. circuit breaker fixing bracket, 10-1. vertical panel, 10-2. end plate, 11. load-bearing support plate, 12. connecting conductive bar, 13 .Limiting bracket, 14. Busbar, 15. Operating tool, 16. Auxiliary circuit static plug-in, 16-1. Branch auxiliary circuit static plug-in, 17. Unit room layer plate, 18. Closing interlock hole, 19-1. Upper hook plate, 19-2. Lower hook plate, 20. Closing interlock base plate, 21. Transformer, 22. Switch shaft, 23. Closing interlock guide tube, 24. Interlocking square rod, 25. Protective isolation cover, 26. Secondary manual pull-out connector, 27. Power distributor, 28. Main circuit outlet terminal, 29. Auxiliary circuit outlet terminal, 30. Wire positioning frame, 31. Door lock locking bracket, 32. Threading hole, 33. Rack bottom plate, 34-1. RS485 communication dynamic plug-in, 34-2. RS485 communication static plug-in. DETAILED DESCRIPTION

[0072] Embodiment 1, as Figures 1 to 3 As shown, a stud force-enhancing plug-in and pull-out device for a low-voltage switch cabinet comprises a rotating member and a fixed member, wherein the rotating member and the fixed member are specifically a plug-in stud 2 and a plug-in nut 5 which can be sleeved on the plug-in stud 2 and has internal and external threads. The rotating member is axially limited and can be rotatably installed around its own axis on a rack rear end plate 1 of a unit assembly for installing a main circuit connector 6. The fixed member is fixedly installed on a unit room isolation plate 4. The rotating member has an operating head 2-1 for operating the rotating member to rotate. The operating head 2-1 is in an exposed state relative to the front side of the rack rear end plate 1, and is used to operate the rotating member to rotate through the operating head 2-1 at the front side of the rack rear end plate 1.

[0073] In the present embodiment 1, the rotating part is the plug-in stud 2, the fixing part is the plug-in nut 5, the plug-in stud 2 comprises an operating section, a limiting section 2-2 and a threaded section 2-3 arranged in sequence front and back, the threaded section 2-3 has an external thread for cooperating with the internal thread of the plug-in nut 5, the front end of the operating section is an operating head 2-1, a force-enhancing limiting force bracket 3 is installed on the back of the rear end plate 1 of the rack, and is used to form an axial limiting cavity between the rear end plate 1 of the rack and the force-enhancing limiting force bracket 3, the limiting section 2-2 is a protruding structure, the plug-in stud 2 is axially limited by the limiting section 2-2 embedded in the axial limiting cavity, the force-enhancing limiting force bracket 3 and the rear end plate 1 of the rack have through holes, the threaded section 2-3 and the operating section pass through the through holes on the force-enhancing limiting force bracket 3 and the rear end plate 1 of the rack, respectively. The limiting section 2-2 is specifically a convex ring structure.

[0074] The threaded section 2-3 and the operating section have a certain matching clearance with the through hole to ensure that the plug-in stud 2 can float slightly, ensuring that the plug-in stud 2 and the plug-in nut 5 on the unit room isolation plate 4 can be correctly aligned within the alignment error range of ±1.2mm. The grade of the plug-in stud 2 is 8.8, which has corresponding strength guarantee.

[0075] The operating head 2-1 of the plug-in stud 2 is specifically a hexagonal screw head, and the operating tool 15 for rotating the plug-in stud 2 is an extended hexagonal socket. The extended hexagonal socket can be a straight rod type that is convenient for electric rotation with an electric tool, or a bent type that is convenient for manual rotation.

[0076] The force-boosting and limiting force-bearing bracket 3 includes a U-shaped frame 3-1 protruding in the middle and legs 3-2 on both sides of the U-shaped frame 3-1. The force-boosting and limiting force-bearing bracket 3 is installed on the rear end plate 1 of the rack through the legs 3-2 and screws. The through hole of the force-boosting and limiting force-bearing bracket 3 is opened on the top plate of the U-shaped frame 3-1. The U-shaped frame 3-1 is specifically a right-angle U-shaped frame.

[0077] like Figure 4 , 5 , 6, 8, 9 and 10, a plug-in assembly, specifically a plug-in assembly of a low-voltage switch cabinet, includes a unit frame and a main circuit plug-in connection structure installed on the unit frame, the unit frame includes a frame rear end plate 1 for installing a main circuit connector 6, a load-bearing support plate 11, a circuit breaker fixing bracket 10 and a closing interlocking base plate 20, and the plug-in stud 2 of the above-mentioned stud force-enhancing plug-in device is axially limited and rotatably installed around the axis on the frame rear end plate 1.

[0078] There are two plug-in studs 2, which are respectively located on the left and right sides of the rear end plate 1 of the rack.

[0079] The load-bearing support plate 11 is indirectly fixed to the rear end plate 1 of the rack. The load-bearing support plate 11 is located at the bottom of the front side of the rear end plate 1 of the rack. Rollers 9 are arranged on both sides of the bottom of the rear end plate 1 of the rack. Rollers 9 are also installed on the load-bearing support plate 11. The rollers 9 on the load-bearing support plate 11 are located in the middle of the front relative to the rollers 9 on both sides of the bottom of the rear end plate 1 of the rack, so as to provide four-point support for the plug-in assembly. Of course, it is not ruled out that the load-bearing support plate 11 is directly fixed to the rear end plate 1 of the rack.

[0080] There are two rollers 9 on the load-bearing support plate 11, which are respectively located at both sides of the front end of the load-bearing support plate 11. When the plug-in assembly enters the unit chamber, the plug-in assembly is supported by the four rollers 9 to slide into the unit chamber in a balanced manner.

[0081] The circuit breaker fixing bracket 10 is fixed on the rear end plate 1 of the rack and is used to install the circuit breaker 7. The circuit breaker fixing bracket 10 is U-shaped, including a vertical panel 10-1 and end plates 10-2 on the upper and lower sides of the vertical panel 10-1. The circuit breaker fixing bracket 10 is fixed to the rear end plate 1 of the rack through the ends of the end plates 10-2 on the upper and lower sides, and the rear end of the load-bearing support plate 11 is fixed to the vertical panel 10-1 of the circuit breaker fixing bracket 10.

[0082] The closing interlocking base plate 20 is fixed on the load-bearing support plate 11. The closing interlocking base plate 20 and the load-bearing support plate 11 are an integral or split structure. The closing interlocking base plate 20 has a closing interlocking hole 18, which is used to perform closing interlocking with the closing interlocking hole 18 on the unit room layer plate 17 and the closing interlocking rod mechanism on the switch shaft rod 22. Specifically, in this embodiment 1, the closing interlocking hole 18 on the closing interlocking base plate 20 is provided by a closing interlocking guide tube 23 installed at the front end of the closing interlocking base plate 20, or a hole can be directly opened on the closing interlocking base plate 20 as the closing interlocking hole 18.

[0083] The closing interlocking rod mechanism on the switch shaft 22 is a conventional mechanism in the art, including an interlocking square rod 24. The plug-in assembly is provided with a closing interlocking mechanism to effectively prevent the occurrence of a safety accident in which the circuit breaker 7 in the closed state enters the unit room by mistake. Fig.16 shown.

[0084] The main circuit plug-in connection structure includes a circuit breaker 7 and a main circuit connector 6. The circuit breaker 7 has three phases, specifically A phase, B phase and C phase from top to bottom. The circuit breaker 7 is installed on a circuit breaker fixing bracket 10, and the main circuit connector 6 is installed on the rear end plate 1 of the rack. The main circuit connectors 6 on the incoming and outgoing sides are both non-body-commutated main circuit connectors 6-2. The phase centers of the connection terminals of the main circuit connectors 6 of each phase on the incoming and outgoing sides are arranged in correspondence with the phase centers of the corresponding phases of the circuit breaker 7. The main circuit connectors 6 of each phase on the incoming and outgoing sides are connected one by one with the corresponding phases of the circuit breaker 7 through connecting conductive bars 12 arranged in layers from top to bottom.

[0085] The specific structure is as follows: the main circuit connectors 6 of the A phase, B phase and C phase on the incoming line side are arranged in layers from top to bottom, and the horizontal phase spacing of the plug-in ends of the main circuit connectors 6 of each phase is consistent with the phase spacing of the busbar 14, and are used for plug-in connection with the busbar 14. In the horizontal direction, the main circuit connectors 6 of the A phase, B phase and C phase are arranged in order from outside to inside, and the main circuit connectors 6 of each phase on the incoming line side are connected one by one with the corresponding phase of the circuit breaker 7 through the connecting conductive bars 12 arranged in layers from top to bottom.

[0086] The connection terminals of the main circuit connectors 6 of each phase on the outgoing line side are arranged in a triangle shape, with the connection terminals of the main circuit connectors 6 of the B phase in the middle position being staggered in the vertical direction and located inside the connection terminals of the main circuit connectors 6 of the A and C phases at the upper and lower positions. The connection conductive bar 12 on the outgoing line side is L-shaped, and the L-shaped connection conductive bar 12 includes a horizontal section connected to the circuit breaker 7 and a vertical section connected to the connection terminals of the main circuit connectors 6. The mutual inductor 21 of the B phase on the outgoing line side is sleeved on the connection terminals of the main circuit connectors 6 of the corresponding phase, and the connection point between the connection terminals of the main circuit connectors 6 of the B phase on the outgoing line side and the connection conductive bar 12 is located in front of the mutual inductor 21 of the B phase. The mutual inductors 21 of the A and C phases on the outgoing line side are sleeved on the horizontal section of the connection conductive bar 12 of the corresponding phase and are located outside the connection conductive bar 12 of the B phase. The mutual inductor 21 of the B phase on the outgoing line side is installed through the mutual inductor 21 mounting bracket on the unit frame.

[0087] A protective isolation cover 25 is installed on the incoming line side of the circuit breaker 7. The protective isolation cover 25 is fixed on the rear end plate 1 of the frame to effectively isolate the human body from the charged body on the incoming line side. The stud force-enhancing plug-in device on the incoming line side is located on the outside of the protective isolation cover 25. When the circuit breaker 7 is in the open state and the operating workpiece is used to operate the plug-in assembly, the protective isolation cover 25 completely isolates the human body, the operating tool 15 from the charged body on the incoming line side to ensure personal operation safety. In consideration of safe operation, the length of the operating tool 15 is designed to exceed the front end face of the circuit breaker 7 by 50 mm. There are ventilation and heat dissipation holes and electrician warning signs on the upper and lower parts of the protective isolation cover 25. A secondary hand-pull connector 26 is set on the front end face of the protective isolation cover 25. The protective isolation cover 25 ensures that the plug-in assembly reaches the IP20 protection level.

[0088] like Figures 4 to 19 As shown, a plug-in assembly unit comprises the above-mentioned plug-in assembly, a unit chamber and the above-mentioned stud force-enhancing plug-in device.

[0089] A plug-in guide device is also provided between the plug-in assembly and the unit chamber, which is used to limit the left and right positions of the plug-in assembly entering the unit chamber.

[0090] The specific structure of the plug-in guide device is as follows: the plug-in guide device includes two limit brackets 13, which are respectively located on the left and right sides of the unit room isolation plate 4, and the limit brackets 13 cooperate with the side surfaces of the plug-in assembly to limit the plug-in assembly between the limit brackets 13.

[0091] Two pairs of upper hook plates 19-1 and lower hook plates 19-2 that are hooked up and down are provided on the bottom of the closing interlocking base plate 20 and the unit chamber layer plate 17. When the plug assembly enters the connection position, the upper hook plate 19-1 and the lower hook plate 19-2 are in a state of hooking up and down.

[0092] The main circuit connector 6 on the rack rear end plate 1 of the plug-in assembly is a main circuit dynamic plug-in. The main circuit dynamic plug-in on the incoming line side is plugged and connected to the busbar 14, and the main circuit dynamic plug-in on the outgoing line side is plugged and connected to the main circuit static plug-in 6-1 on the unit room isolation plate 4. The rack rear end plate 1 of the plug-in assembly also has an auxiliary circuit dynamic plug-in 8, which is used to be plugged and connected to the auxiliary circuit static plug-in 16 on the unit room isolation plate 4. The main circuit dynamic plug-in and the auxiliary circuit dynamic plug-in 8 on the plug-in assembly are collectively referred to as the main and auxiliary circuit dynamic plug-ins, and the main circuit static plug-in 6-1 and the auxiliary circuit static plug-in 16 on the plug-in assembly are collectively referred to as the main and auxiliary circuit static plug-ins. The main circuit dynamic plug-in and the main circuit static plug-in 6-1 both belong to the main circuit connector 6. The auxiliary circuit dynamic plug-in 8 and the auxiliary circuit static plug-in 16 both belong to the auxiliary circuit connector.

[0093] When the plug-in assembly enters the unit chamber, the plug-in assembly is balanced and supported on the unit chamber layer plate 17 by four rollers 9 in a four-point support manner, which solves the installation technical problem of the front and rear load tilting of the plug-in assembly and facilitates quick plug-in and pull-out. The plug-in connection of the plug-in assembly can be completed in 15 seconds, and the plug-in assembly can be pulled out in 15 seconds. At the same time, it is ensured that the stud force-enhancing plug-in device, the main and auxiliary circuit dynamic plug-in and the busbar 14, and the main and auxiliary circuit static plug-in are correctly aligned up and down. The upper hook plate 19-1 and the lower hook plate 19-2 are hooked to control the lifting of the plug-in assembly to ensure the balance of the plug-in assembly front and back and the operating installation strength. The limit bracket 13 positions the plug-in assembly in the left and right directions to ensure that the stud force-enhancing plug-in device, the main and auxiliary circuit dynamic plug-in and the busbar 14, and the main and auxiliary circuit static plug-in are correctly aligned left and right.

[0094] The operation process of this plug-in assembly unit is as follows:

[0095] When the plug-in assembly enters the unit room, the two limit brackets 13 arranged on both sides of the unit room isolation plate 4 position the plug-in assembly left and right, and the plug-in assembly slides into the unit room through the roller 9, and the two pairs of upper hook plates 19-1 and lower hook plates 19-2 are hooked to ensure the correct alignment of the stud force-enhancing plug-in device, the main and auxiliary circuit dynamic plug-in and the busbar 14 and the main and auxiliary circuit static plug-in, and to ensure the front and back balance of the plug-in assembly and the operating installation strength.

[0096] When the plug-in assembly enters the effective position of the unit room, use the operating tool 15 (such as an electric tool holding a hexagonal socket) to insert the operating head 2-1 of the plug-in stud 2, and rotate the plug-in stud 2 in the positive direction (specifically right-handed). The external thread of the plug-in stud 2 engages with the internal thread of the plug-in nut 5, and the limiting section 2-2 is close to the force-enhancing limit support 3, generating a force increase, driving the plug-in assembly and the main and auxiliary circuit dynamic plug-in to move backward, and plugging with the busbar 14 and the main and auxiliary circuit static plug-in to achieve an effective connection. When the top plate of the force-enhancing limit support 3 is against the unit room isolation plate 4, the plug-in assembly is considered to be inserted and connected in place. When the plug-in assembly is inserted and removed by rotating the plug-in stud 2 through the operating tool 15, the left and right sides must be crossed and balanced in steps to ensure balanced movement on the left and right sides. It only takes 15 seconds for the electric operating tool 15 to complete the insertion and connection of the plug-in assembly.

[0097] After the plug-in assembly is inserted and connected in place, the unit door is closed, the circuit breaker 7 is closed, and the interlocking square rod 24 of the closing interlocking rod mechanism locks the unit room layer plate 17, ensuring that the plug-in assembly unit meets the unit short-time withstand current 1S, 50KA strength test specified in GB7251 standard.

[0098] When the plug assembly needs to be unplugged, the operating tool 15 is inserted into the operating head 2-1 of the plug stud 2, and the plug stud 2 is rotated in the reverse direction. The limit section 2-2 of the plug stud 2 is close to the rear end plate 1 of the rack, generating a force increase, driving the plug assembly and the main and auxiliary circuit dynamic plug-in to move forward, and separate from the busbar 14 and the main and auxiliary circuit static plug-in, completing the complete isolation of the main and auxiliary circuit connectors. It only takes 15 seconds for the electric operating tool 15 to unplug the plug assembly.

[0099] The structural application principle of the stud force-enhancing plug-in assembly unit of this embodiment 1 solves the structural application and operation problems of the assembly that can be removably connected and removably pulled out of the main and auxiliary circuit connectors. The innovative structural principle technology of the stud force-enhancing plug-in device has no precedent in the technology of plug-in assembly units for low-voltage switch cabinets. It is an international and domestic first in the industry segment, filling the gap in the application technology of plug-in assembly units for low-voltage switch cabinets in this field. At the same time, it saves labor in application, is fast to operate, is easy to plug and unplug, and has no mechanical failures. As a result, the plug-in assembly structure is simplified, less steel plates are used, and costs are reduced, allowing users to perform maintenance without power outages, and the comprehensive performance meets the requirements of industry standards.

[0100] The plug assembly and unit of the present embodiment 1 adopt a structural design in which the phase centers of the main circuit connector 6 and the phase centers of the circuit breaker 7 are arranged in unison, and the transformer 21 is integrated on the main circuit connector 6, so that the connection distance H between the 630A circuit breaker 7 and the main circuit connector 6 is reduced to 102mm, and the copper consumption is reduced by 30% compared with the traditional main circuit connection structure. The unit depth of 350mm and the cabinet depth of 800mm can meet the application requirements of the 630A, 400A, 250A, and 125A series plug assemblies, while the fixed plug assembly unit requires a unit room depth of 500mm and a cabinet depth of 1000mm.

[0101] Compared with the fixed plug-in assembly unit, the plug-in assembly and unit of the present embodiment 1 use the main circuit connector 6 to connect the busbar 14, and the busbar 14 is not punched, so that one device can reduce the labor cost by 30 yuan.

[0102] Compared with the fixed plug-in assembly unit, the plug-in assembly and the unit of the embodiment 1 has a simplified manufacturing process for the circuit breaker connector, that is, the connecting conductive bar 12, and the manufacturing labor cost is reduced by 60%. One circuit breaker 7 uses six connecting conductive bars 12, and the manufacturing labor cost is reduced by 6 yuan.

[0103] Excluding the 6 screws that come with the circuit breaker, compared with the fixed plug-in assembly unit, the plug-in assembly and the unit of this embodiment 1 need to be equipped with 6 screws to connect the 3-phase main circuit connector 6 to the circuit breaker 7, while the base of the fixed plug-in assembly unit needs to be equipped with 9 screws, which reduces the cost by 4 yuan.

[0104] The plug assembly of the present embodiment 1 is installed on a workbench, which is labor-saving and fast. The fixed plug assembly unit is installed entirely on the cabinet, and the installation labor cost is more than 100%. One device has 7 units, and the installation labor cost is 2 more hours, and the labor cost is 70 yuan more.

[0105] The plug-in assembly and unit of the present embodiment 1 are applicable to circuit breakers 7 of all models and current levels in the whole industry, and are much more applicable than fixed plug-in assembly units, which require one-to-one matching application.

[0106] The plug assembly and unit of the present embodiment 1 can reduce the temperature rise by 5-10°C during operation compared to the fixed plug assembly unit, and there is no overheating during operation. In principle, zero failure is 100% guaranteed, except for failures caused by installation problems at the manufacturer.

[0107] The following is a comparison with the fixed plug-in assembly unit from the perspective of economic cost.

[0108] The plug-in assembly and unit of the present embodiment 1 can achieve multiple current levels of 125A, 250A, 400A, and 630A. The busbar 14 current of the switch cabinet equipped with the plug-in assembly and unit of the present embodiment 1 can reach a maximum of 2500A and a minimum of 1000A, which meets the technical requirements for the operation of 5G equipment and 2000A equipment. However, foreign fixed plug-in assembly units of different brands only have bases with two current levels of 250A and 630A, which are suitable for circuit breakers 7 of different current levels. The 100A circuit breaker 7 uses a 250A base, and the 400A circuit breaker 7 uses a 630A base. The total cost of the same unit is 65% higher than that of the plug-in assembly unit of the present embodiment 1. In terms of one device, compared with the plug-in assembly unit of the present embodiment 1, which also uses a foreign brand fixed circuit breaker, the total cost of one device and 7 units is reduced by 1900-3500 yuan. Compared with the same current level, compared with the fixed plug-in assembly units of domestic high-end brands, the plug-in assembly units of this embodiment 1 have a total cost of 600 to 700 yuan lower for one device with 7 units. Compared with the fixed plug-in assembly units of domestic low-end brands, the plug-in assembly units of this embodiment 1 have a total cost of 250 to 350 yuan lower for one device with 7 units.

[0109] The plug-in assembly unit of the first embodiment can be 800mm deep, while the fixed plug-in assembly unit requires a 1000mm deep cabinet. When applied to the subway, based on the calculation of 15 devices in one subway station, the installation site can be reduced by 1.8㎡. Based on the calculation of 2.8m high space, 5.04 cubic meters of earthwork can be saved. Adding the concrete construction cost, the cost savings are extremely considerable, and the cost reduction for offshore platform applications is even more considerable. When applied to box transformers and high-rise buildings, the reduced infrastructure costs are also immeasurable.

[0110] The plug-in assembly unit of the present embodiment 1 realizes the main circuit connection structure with force-enhanced removable plug-in connection and removable pull-out for non-power-off maintenance, and can be used in low-voltage switchgear power distribution center to replace the withdrawable switchgear in the power distribution center. One standard cabinet of the plug-in assembly of the present embodiment 1 uses 70 kg less steel plate than the withdrawable switchgear.

[0111] The plug assembly unit of the present embodiment 1 uses a main circuit plug connection structure conductive bar 12 with a copper consumption of 2 to 4 kg less than that of a fixed plug assembly unit.

[0112] At present, there are 90,000 to 100,000 single fixed plug-in switch cabinets and 250,000 to 300,000 single withdrawable switch cabinets in the industry. In the future application market, the plug-in assembly unit of this embodiment 1 will replace the fixed plug-in switch cabinet and the withdrawable switch cabinet, which has a huge comprehensive social benefit of saving copper, steel plates, and man-hours.

[0113] Example 1 is a preferred embodiment of the present invention. Under the effective technical inspiration of the present invention, it does not exclude that there are other extended implementation methods, which also belong to the protection scope of the present invention, such as the following embodiments.

[0114] Embodiment 2, a plug-in assembly and unit, compared with Embodiment 1, the difference is that: a force-boosting and limiting force-bearing bracket 3 is installed on the front side of the rear end plate 1 of the rack, and is used to form an axial limiting cavity between the rear end plate 1 of the rack and the force-boosting and limiting force-bearing bracket 3, and the plug-in stud 2 is axially limited by the limiting section 2-2 embedded in the axial limiting cavity, and the force-boosting and limiting force-bearing bracket 3 and the rear end plate 1 of the rack are provided with through holes, and the threaded section 2-3 and the operating section pass through the through holes on the rear end plate 1 of the rack and the force-boosting and limiting force-bearing bracket 3 respectively.

[0115] Embodiment 3, a plug-in assembly and unit, compared with embodiment 1, the difference is that: the rotating part is a plug-in nut 5, the fixing part is a plug-in stud 2, the plug-in nut 5 replaces the plug-in stud 2 of embodiment 1 for axial limitation and is rotatably installed around its own axis on the rear end plate 1 of the frame, and the plug-in stud 2 replaces the plug-in nut 5 of embodiment 1 and is fixedly installed on the unit room isolation plate 4.

[0116] Embodiment 4, as Fig. 20 As shown, a plug-in assembly and unit are different from Example 1 in that: the main circuit plug-in connection structure on the incoming line side of Example 4 adopts the main circuit body reversing connector 6-3 to set the phase center of the main circuit connector 6 and the phase center of the circuit breaker 7 consistent with each other, which is the same as the main circuit plug-in connection structure disclosed in CN114552472A.

[0117] Specifically, the main circuit connectors 6 of the A phase, B phase and C phase on the incoming line side are arranged in layers from top to bottom, and the horizontal phase spacing of the plug-in terminals of the main circuit connectors 6 of each phase is consistent with the phase spacing of the busbar 14, and are used for plugging and connecting with the busbar 14, wherein the main circuit connectors 6 of the A phase and the B phase adopt the main circuit connectors 6-2 of non-body switching, and the main circuit connectors 6 of the C phase adopt the main circuit body switching connectors 6-3, and the connection terminals of the main circuit connectors 6 of the B phase are staggered and located on the inner side relative to the connection terminals of the main circuit connectors 6 of the A phase and the C phase, as shown in FIG. Fig. 20 As shown; or, the main circuit connector 6 of phase A is a non-body commutation main circuit connector 6-2, the main circuit connector 6 of phases B and C is a main circuit body commutation connector 6-3, and the connection terminals of the main circuit connector 6 of phase B are staggered and located on the outside relative to the connection terminals of the main circuit connector 6 of phases A and C.

[0118] Embodiment 5, as Figures 21 to 27As shown, in a plug-in power distribution cabinet, each device using a 1 / 2 plug-in assembly unit can provide 18 circuits with a current of 100A, which is about 10% of the application requirements in the plug-in power distribution cabinet. For this reason, this embodiment 5 provides a 1 / 2 plug-in assembly and unit. The structure of the 1 / 2 plug-in assembly and unit of this embodiment 5 is basically the same as that of the plug-in assembly and unit of the standard unit specification of the above embodiments 1 to 4, but the unit room needs to be arranged with a power distributor 27 for the main circuit incoming line.

[0119] The 1 / 2 plug-in assembly of this embodiment 5 includes a unit frame and a main circuit plug-in connection structure installed on the unit frame. The unit frame includes a frame rear end plate 1 for installing the main circuit connector 6, a load-bearing support plate 11, a circuit breaker fixing bracket 10 and a closing interlocking base plate 20. The plug-in studs 2 of the above-mentioned stud force-enhancing plug-in device are axially limited and rotatably installed around the axis on the frame rear end plate 1. The bottom of the closing interlocking base plate 20 and the unit room layer plate 17 are provided with two pairs of upper hook plates 19-1 and lower hook plates 19-2 that are hooked up and matched with each other. A protective isolation cover 25 is installed on the incoming line side of the circuit breaker 7. The 1 / 2 plug-in assembly unit includes a unit room and two 1 / 2 plug-in assemblies arranged on the left and right sides of the unit room. The 1 / 2 plug-in assembly is plugged and unplugged in the unit room by two left and right stud force-enhancing plug-in devices. The unit room has a plug-in and pull-out guide device formed by a limiting bracket 13 to limit the left and right positions of the 1 / 2 plug-in and pull-out assembly entering the unit room.

[0120] The difference between the 1 / 2 plug-in assembly and unit and the plug-in assembly and unit of the standard unit specifications of the above-mentioned embodiments 1 to 4 is that: the rear part of the unit room is arranged with a power distributor 27 for the main circuit incoming line, and the front plate of the power distributor 27 is the unit room isolation plate 4. The power distributor 27 and the 1 / 2 plug-in assembly of this embodiment 5 are not arranged with a main circuit connector 6 for dynamic and static plug-in matching for branching out, but the power distributor 27 and the 1 / 2 plug-in assembly of this embodiment 5 can also be arranged with a main circuit connector 6 for dynamic and static plug-in matching for branching out according to user requirements. The 1 / 2 plug-in assembly is plugged with the power distributor 27 through the branch main circuit dynamic plug-in 6-4 to obtain the incoming power of the 1 / 2 plug-in assembly. The rear plate of the power distributor 27 is arranged with the main circuit connector 6 for plugging and connecting with the busbar 14, and the rear output terminal of the power distributor 27 is arranged with a transformer 21, a main circuit output terminal 28 and an auxiliary circuit output terminal 29. The front panel of the power distributor 27 is arranged with the shunt main circuit static plug-in 6-5 and the shunt auxiliary circuit static plug-in 16-1. The main circuit connector 6 arranged on the rear panel of the power distributor 27 is connected to the shunt main circuit static plug-in 6-5 through the shunt copper busbar to shunt the incoming power. The shunt copper busbar is isolated from each other by the insulating plate. The shunt auxiliary circuit static plug-in 16-1 is connected to the auxiliary circuit outlet terminal 29. The circuit breaker 7 of the 1 / 2 plug-in assembly is connected to the shunt main circuit dynamic plug-in 6-4 on the rear panel 1 of the rack through a wire. Figures 21 to 27 The wires to the circuit breaker are not shown.

[0121] The two upper hook plates 19-1 are an integral structure.

[0122] The outlet mode of the circuit breaker 7 is that the wire connected to the outlet end of the circuit breaker 7 is directly passed through the wire threading hole 32 of the power distributor 27 to the back of the board, and then passed through the transformer 21 to connect with the main circuit outlet terminal 28. A wire positioning frame 30 and a door lock locking bracket 31 are set between the two 1 / 2 plug-in assemblies of the unit room, and the door lock locking bracket 31 serves as the locking basis of the unit door. The wire at the outlet end in the unit room is fixed on the wire positioning frame 30, which is convenient for the unplugging operation of the 1 / 2 plug-in assembly and avoids the unplugging action of the 1 / 2 plug-in assembly affecting the wire direction and connection joint of the outlet end located behind the power distributor 27. After the circuit breaker 7 is opened, the connection joint between the outlet end of the circuit breaker 7 and the wire is first removed, and then the force is increased to pull out the 1 / 2 plug-in assembly. A certain length of the wire at the outlet end can also be reserved, so that the 1 / 2 plug-in assembly can be pulled out to the isolation position first, and then the connection joint between the outlet end of the circuit breaker 7 and the wire can be removed to complete the pull-out of the 1 / 2 plug-in assembly for maintenance, and the operation safety is extremely high.

[0123] In the attached Figures 21 to 27 The power distributor 27 of the 1 / 2 plug-in assembly unit is specifically arranged with a 250A three-phase main circuit connector 6, a 125A three-phase branch main circuit static plug-in 6-5, and two branch auxiliary circuit static plug-ins 16-1 for plugging and unplugging with the two 1 / 2 plug-in assemblies' branch auxiliary circuit dynamic plug-ins 8-1, as well as four plug-in nuts 5. The 1 / 2 plug-in assembly unit can be arranged with 1 / 2 plug-in assemblies of 250A and 630A specifications.

[0124] The branch main circuit dynamic plug-in 6-4 and the branch main circuit static plug-in 6-5 of the present invention belong to the category of the main circuit connector 6, and the branch auxiliary circuit static plug-in 16-1 and the branch auxiliary circuit dynamic plug-in 8-1 belong to the category of the auxiliary circuit connector.

[0125] When the 1 / 2 plug-in assembly enters the 1 / 2 unit room, the 1 / 2 plug-in assembly is balanced and supported by the two matching limit brackets and four rollers to align the branch main circuit dynamic plug-in 6-4 correctly with the branch main circuit static plug-in 6-5 of the power distributor 27, and the plug-in stud 2 is correctly aligned with the plug-in nut 5. Tighten the plug-in stud 2, the plug-in stud 2 and the plug-in nut 5 engage to drive the branch main circuit dynamic plug-in 6-4 of the 1 / 2 plug-in assembly to insert into the branch main circuit static plug-in 6-5, and connect the incoming power supply of the circuit breaker 7. Loosen the plug-in stud 2, the plug-in stud 2 withdraws from the plug-in nut 5, drives the branch main circuit dynamic plug-in 6-4 to pull out the branch main circuit static plug-in 6-5, and isolates the incoming power supply.

[0126] The advantage of the 1 / 2 plug assembly unit of the present embodiment 5 not to route the wires through the main circuit connector 6 is that the unit depth can be 350 mm, which is consistent with the unit depth of the above-mentioned standard plug assembly unit, and mixed installation can be achieved.

[0127] Embodiment 6, as Figures 28 to 31 As shown, according to the application requirements of different users, the stud force-enhancing plugging and unplugging device of the present invention can also be applied to the removable plug-in assembly unit in CN114552472A to perform connection and isolation plug-in and unplugging operations.

[0128] The plug-in assembly unit of this embodiment 6 is the removable plug-in assembly unit in CN114552472A, and the difference between the removable plug-in assembly unit in CN114552472A is that the removable plug-in assembly unit in CN114552472A is manually plugged and unplugged by a handle, or is lever-assisted by a lever-assisted force-enhancing mechanism, while the plug-in assembly unit of this embodiment 6 is force-assisted by a stud-assisted plug-in device, and the position interlocking can no longer be used according to user requirements, thereby saving manufacturing costs and making the removable plug-in assembly unit more feasible.

[0129] The unit frame of the removable plug assembly of the sixth embodiment is an L-shaped frame structure, including a vertical frame rear end plate 1 and a horizontal frame bottom plate 33. The unit frame also has a circuit breaker fixing bracket 10 for installing the circuit breaker 7. The circuit breaker 7 is installed on the vertical panel 10-1 of the circuit breaker fixing bracket 10. The main circuit plug-in connection structure including the main circuit connector 6, the circuit breaker 7 and the transformer 21 of the sixth embodiment is the same as that of the first embodiment.

[0130] There is a guide rail device for guiding through a slide column and a slide groove on the left and right sides of the removable plug assembly. A total of three pairs of upper hook plates 19-1 and lower hook plates 19-2 are arranged between the unit frame and the unit room layer plate 17.

[0131] The removable plug-in assembly unit of the sixth embodiment is also driven by two stud force-enhancing plug-in devices arranged on the left and right to drive the unit frame into or out of the connection position. There are two stud force-enhancing plug-in devices, which are respectively located on the left and right sides of the rear end plate 1 of the frame.

[0132] The front part of the frame bottom plate 33 of the unit frame and the unit room layer plate 17 are provided with a closing interlocking hole 18 for performing closing interlocking with the closing interlocking rod mechanism on the switch shaft rod 22 .

[0133] The removable plug assembly unit of the sixth embodiment is an indispensable supporting application structure technology for the plug unit. When applied to the control circuit, the plug assembly of the first to fourth embodiments cannot install secondary components, and the removable plug assembly unit structure of the sixth embodiment is required to solve the problem of arranging secondary components. The guide rail device of the removable plug assembly unit applies the guide rail device disclosed in the invention patent 202210438439.7.

[0134] Embodiment 7, as Fig.32 and 33 As shown, on the basis of Example 1, in order to realize the intelligence of the low-voltage switchgear, it is necessary to install communication connectors on the plug-in assembly and the unit room, specifically including the RS485 communication dynamic connector 34-1 installed on the rear end plate 1 of the rack of the plug-in assembly and the RS485 communication static connector 34-2 installed on the unit room isolation plate 4. In order to make room for the installation of communication connectors, the main circuit connector 6 on the outgoing side needs to be moved to the left, and the connecting conductive bar 12 on the outgoing side needs to be bent on the basis of the L shape to connect the main circuit connector 6 on the outgoing side. However, the above structure still belongs to the phase-to-phase center of the connection terminal of the main circuit connector 6 of each phase on the outgoing side and the phase-to-phase center of the corresponding phase of the circuit breaker 7, and the main circuit connector 6 of each phase on the outgoing side is connected to the corresponding phase of the circuit breaker 7 through the connecting conductive bar 12 arranged in layers from top to bottom.

Claims

1. A stud force-enhancing plugging and pulling device for a low-voltage switch cabinet, characterized in that: The invention comprises a rotating part and a fixed part, wherein the rotating part and the fixed part are respectively a plug-in stud (2) and a plug-in nut (5) which can be sleeved on the plug-in stud (2) and have internal and external threads, or the fixed part and the rotating part are respectively a plug-in stud (2) and a plug-in nut (5) which can be sleeved on the plug-in stud (2) and have internal and external threads, wherein the rotating part has a limiting section (2-2), and the rotating part is axially limited by the limiting section (2-2) and can be rotatably mounted around its own axis on a rack rear end plate (1) of a unit assembly for mounting a main circuit connector (6), and the fixed part is fixedly mounted on a unit room isolation plate (4), and the rotating part has an operating head (2-1) for operating the rotating part to rotate, and the operating head (2-1) is in an exposed state relative to the front side of the rack rear end plate (1), and is used to operate the rotating part to rotate by the operating head (2-1) at the front side of the rack rear end plate (1), and the rotating part drives the rack rear end plate to move forward and backward through the limiting section (2-2).

2. The stud force-enhancing plugging and pulling device for a low-voltage switch cabinet according to claim 1 is characterized in that: When the rotating part is a plug-in stud (2) and the fixing part is a plug-in nut (5), the plug-in stud (2) comprises an operating section, a limiting section (2-2) and a threaded section (2-3) arranged in sequence front to back, the threaded section (2-3) having an external thread for cooperating with the internal and external threads of the plug-in nut (5), the front end of the operating section being an operating head (2-1), a force-enhancing limiting force bracket (3) being installed on the back of the rear end plate (1) of the frame, for forming an axial limiting cavity between the rear end plate (1) of the frame and the force-enhancing limiting force bracket (3), the limiting section (2-2) being a protruding structure, the plug-in stud (2) being axially limited by the limiting section (2-2) embedded in the axial limiting cavity, the force-enhancing limiting force bracket (3) and the rear end plate (1) of the frame both having through holes, the threaded section (2-3) and the operating section respectively passing through the through holes on the force-enhancing limiting force bracket (3) and the rear end plate (1) of the frame; Alternatively, a force-boosting and limiting force-bearing bracket (3) is installed on the front side of the rear end plate (1) of the rack, and is used to form an axial limiting cavity between the rear end plate (1) of the rack and the force-boosting and limiting force-bearing bracket (3); the plug-in stud (2) is axially limited by a limiting section (2-2) embedded in the axial limiting cavity; both the force-boosting and limiting force-bearing bracket (3) and the rear end plate (1) of the rack have through holes; the threaded section (2-3) and the operating section respectively pass through the through holes on the rear end plate (1) of the rack and the force-boosting and limiting force-bearing bracket (3).

3. The stud force-enhancing plugging and pulling device for a low-voltage switch cabinet according to claim 2 is characterized in that: The force-boosting and position-limiting force-bearing bracket (3) comprises a U-shaped frame (3-1) protruding in the middle and supporting feet (3-2) on both sides of the U-shaped frame (3-1); the force-boosting and position-limiting force-bearing bracket (3) is installed on the rear end plate (1) of the frame via the supporting feet (3-2); and the through hole of the force-boosting and position-limiting force-bearing bracket (3) is opened on the top plate of the U-shaped frame (3-1).

4. A plug-in assembly, specifically a plug-in assembly for a low-voltage switch cabinet, characterized in that: The invention comprises a unit frame, the unit frame comprises a frame rear end plate (1) for mounting a main circuit connector (6), and a rotating part of the stud force-enhancing plugging and unplugging device for a low-voltage switch cabinet as claimed in claim 1, 2 or 3 is mounted on the frame rear end plate (1).

5. A plug-in assembly unit, specifically a plug-in assembly unit for a low-voltage switch cabinet, comprising a plug-in assembly and a unit chamber, wherein the plug-in assembly comprises a unit frame, and the unit frame comprises a frame rear end plate (1) for mounting a main circuit connector (6), wherein: A stud force-enhancing plug-in device for a low-voltage switch cabinet as claimed in claim 1, 2 or 3 is provided between the plug-in assembly and the unit chamber, for driving the plug-in assembly to enter or exit the connection position.

6. The plug assembly unit according to claim 5, characterized in that: There are two stud force-enhancing plugging and pulling devices, which are respectively located on the left and right sides of the rear end plate (1) of the frame.

7. The plug assembly unit according to claim 5, characterized in that: The unit rack comprises a rack rear end plate (1) and a load-bearing support plate (11), the load-bearing support plate (11) being directly or indirectly fixed to the rack rear end plate (1), the load-bearing support plate (11) being located at the bottom of the front side of the rack rear end plate (1), rollers (9) being arranged on both sides of the bottom of the rack rear end plate (1), and rollers (9) being also installed on the load-bearing support plate (11), the rollers (9) on the load-bearing support plate (11) being located at the front middle position relative to the rollers (9) on both sides of the bottom of the rack rear end plate (1), and being used for supporting the plug-in assembly entering the unit chamber, and a plug-in guide device being provided between the plug-in assembly and the unit chamber, and being used for limiting the left and right positions of the plug-in assembly entering the unit chamber.

8. The plug assembly unit according to claim 7, characterized in that: A circuit breaker fixing bracket (10) is fixed on the rear end plate (1) of the frame for mounting the circuit breaker (7), and the rear end of the load-bearing support plate (11) is fixed on the circuit breaker fixing bracket (10).

9. The plug assembly unit according to claim 7, characterized in that: The unit frame further comprises a closing interlocking base plate (20), the closing interlocking base plate (20) being fixed on the load-bearing support plate (11), the closing interlocking base plate (20) and the load-bearing support plate (11) being an integral or separate structure, and the closing interlocking base plate (20) having a closing interlocking hole (18) for performing closing interlocking with the closing interlocking hole (18) on the unit room layer plate (17) and the closing interlocking rod mechanism on the switch shaft rod (22).

10. The plug assembly unit according to claim 7, characterized in that: The plug-in guide device comprises two limit brackets (13), the two limit brackets (13) are respectively located on the left and right sides of the unit room isolation plate (4), and the limit brackets (13) cooperate with the side surfaces of the plug-in assembly to limit the plug-in assembly between the limit brackets (13).

11. The plug assembly unit according to claim 9, characterized in that: The bottom of the closing interlocking base plate (20) and the unit chamber layer plate (17) are provided with an upper hook plate (19-1) and a lower hook plate (19-2) that are hooked together up and down. When the plug-in assembly enters the connection position, the upper hook plate (19-1) and the lower hook plate (19-2) are in a hooked combination state.

12. The plug assembly unit according to claim 5, characterized in that: The plug-in assembly further comprises a main circuit plug-in connection structure, the main circuit plug-in connection structure comprising a circuit breaker (7) and a main circuit connector (6), the circuit breaker (7) being mounted on a unit frame, two stud force-enhancing plug-in devices being respectively located on the left and right sides of a rear end plate (1) of the frame, a protective isolation cover (25) being installed on the incoming line side of the circuit breaker (7), and the stud force-enhancing plug-in device on the incoming line side being located on the outside of the protective isolation cover (25).

13. The plug assembly unit according to claim 5, characterized in that: The plug-in assembly further comprises a main circuit plug-in connection structure, the main circuit plug-in connection structure comprising a circuit breaker (7) and a main circuit connector (6), the circuit breaker (7) being mounted on a circuit breaker fixing bracket (10), and the main circuit connector (6) being mounted on a rear end plate (1) of the rack. The phase centers of the connection terminals of the main circuit connectors (6) of each phase on the incoming line side and the outgoing line side are arranged to correspond to the phase centers of the corresponding phases of the circuit breaker (7). The main circuit connectors (6) of each phase on the incoming line side and the outgoing line side are connected to the corresponding phases of the circuit breaker (7) in a one-to-one correspondence through connecting conductive bars (12) arranged in layers from top to bottom. The main circuit connector (6) on the incoming line side is a non-body reversing main circuit connector (6-2) or a main circuit body reversing connector (6-3).

14. The plug-in assembly unit according to any one of claims 5 to 12, characterized in that: The assembly unit is specifically a 1 / 2 plug-in assembly unit, the plug-in assembly is a 1 / 2 plug-in assembly, a power distributor (27) is arranged at the rear of the unit room, and the 1 / 2 plug-in assembly is plugged into the branch main circuit static plug-in (6-5) on the power distributor (27) through the branch main circuit dynamic plug-in (6-4).

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