Eccentric closing interlocking mechanism and drawer unit

Abstract

The utility model relates to an eccentric closing interlocking mechanism and a drawer unit. The eccentric switching-on interlocking mechanism comprises a switching-on interlocking fixing support, a switching-on interlocking traction plate and a gear synchronous transmission mechanism, the switching-on interlocking traction plate is in driving fit with the handle shaft lever, and the switching-on interlocking traction plate drives a switching-on interlocking locking plate to move downwards through an arc-shaped traction sliding groove to perform switching-on interlocking; the gear synchronous transmission mechanism installed on the closing interlocking fixing support is provided with a left synchronous end and a right synchronous end, the right synchronous end is in driving fit with the handle shaft lever, and the left synchronous end is in driving fit with the manual operation shaft lever. The drawer unit adopts the eccentric closing interlocking mechanism, the circuit breaker adopts a central manual operation mechanism, and the manual operation shaft lever and the handle shaft lever are respectively in driving fit with the eccentric closing interlocking mechanism. The beneficial effects are that the MCC loop drawer unit breaks through the technology of 250A and 100A MCC loop drawer units with the cabinet width of 500mm, and can ensure that the installation positions of opening and closing handles of various drawer units mixed in switch cabinet equipment are unified.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage switchgear technology, and in particular to an eccentric closing interlocking mechanism and drawer unit. Background Technology

[0002] Low-voltage switchgear units are categorized into fixed, pluggable, and withdrawable unit assemblies.

[0003] The pull-out unit assembly consists of a unit compartment and drawer units within that compartment. Traditional drawer units typically have a cabinet width of 600mm, an internal unit width of 505-510mm, and a unit depth of 450mm. Drawer units are divided into PC circuit drawer units for PC circuits and MCC circuit drawer units for MCC circuits. The current ratings for drawer units generally include 630A, 400A, 250A, 100A, and 63A; correspondingly, the current ratings for circuit breakers also include 630A, 400A, 250A, 100A, and 63A. PC circuit drawer units are also called distribution circuit drawer units, and MCC circuit drawer units are also called control circuit drawer units.

[0004] The drawer unit needs to be equipped with a circuit breaker, a push mechanism, and a closing interlocking mechanism. The push mechanism is installed at the front center of the unit's base plate. The circuit breaker is opened and closed via a manual operating mechanism. Traditional closing interlocking mechanisms are based on a closing interlocking rod located to the right of the manual operating shaft. The closing interlocking rod is driven by a crank arm mounted on the manual operating shaft. To avoid interference between the closing interlocking rod and the push mechanism, the manual operating shaft needs to be offset to the left of the unit's center B to ensure sufficient clearance.

[0005] In addition, current transformers need to be installed on the outgoing side of the PC circuit drawer unit, and contactors need to be installed on the outgoing side of the MCC circuit drawer unit. The left and right installation positions of the circuit breaker within the unit must not only meet the electrical clearance requirements for the main circuit connection, but also the installation space requirements for the current transformer or contactor. However, the horizontal mounting width varies for different current ratings and brands of circuit breakers. The horizontal mounting widths for 630A and 400A circuit breakers are mainly 270mm, 260mm, 255mm, and 250mm, while the horizontal mounting width for 250A circuit breakers is generally 165mm, and for 100A circuit breakers, it is generally 160mm. The larger the horizontal mounting width, the more space the circuit breaker occupies on the outgoing side of the drawer unit.

[0006] Therefore, in existing technology, to ensure uniform installation of the opening and closing handles on the unit door when various drawer units are mixed in switchgear equipment, 630A and 400A circuit breakers use eccentric manual operating mechanisms, while 250A, 100A, and 63A circuit breakers mostly use center manual operating mechanisms. The fixed position of the opening and closing handles on the unit door is set to be 62mm to the left of the unit center B. In this article, the leftward distance relative to the unit center B is referred to as the off-center distance.

[0007] The eccentric manual operating mechanism can only eccentricate to the left, and the eccentric distance (i.e., the distance to the left of the manual operating shaft relative to the circuit breaker center A) varies depending on the current specification and brand of the circuit breaker. The main commonly used distances are 68mm, 50mm, and 31.5mm. This is primarily because the eccentric distance of the manual operating mechanism is limited by the length of the circuit breaker. For example, the maximum eccentric distance of the manual operating mechanism for a 630A circuit breaker with a horizontal mounting width of 270mm is 68mm. Meanwhile, the 630A circuit breaker also comes in specifications with horizontal mounting widths of 265mm, 260mm, 255mm, and 250mm, where the maximum eccentric distance of the applied eccentric manual operating mechanism is only 50mm, and the minimum eccentric distance is 31.5mm.

[0008] Because the 630A and 400A circuit breakers use eccentric manual operating mechanisms, while the 250A, 100A, and 63A circuit breakers use central manual operating mechanisms, and the eccentric distance of the eccentric manual operating mechanisms is different, the fixed position of the circuit breaker within the unit becomes uncertain. This leads to the need for constant changes in the copper busbar structure connecting the main circuit of the PC circuit, resulting in a low degree of design standardization and complex device layout design, including current transformers, and main circuit connection structure process within the unit.

[0009] Currently, in the PC circuit drawer unit with a cabinet width of 600mm, the main circuit of the PC circuit uses a copper busbar connection scheme. When the circuit breaker is a 250A or 100A circuit breaker, the circuit breaker uses a center manual operation mechanism. Because the opening and closing handle is 62mm to the left, the fixed position of the circuit breaker in the drawer unit is biased to the left towards the incoming line side of the unit. The outgoing line of the circuit breaker needs a longer connecting copper busbar, resulting in a large amount of copper used for the connecting copper busbar.

[0010] When the circuit breaker is a 630A or 400A circuit breaker, and the circuit breaker uses an eccentric manual operating mechanism with an offset of 68mm, the fixed position of the circuit breaker in the drawer unit is offset to the right towards the outgoing line side of the unit. This requires a longer incoming line side connecting copper busbar, resulting in a large amount of copper used for the connecting copper busbar. Moreover, the space for arranging the current transformer on the outgoing line side of the unit becomes small and tight. Therefore, using an eccentric manual operating mechanism with an offset of 68mm or 50mm for 630A and 400A circuit breakers will increase the complexity of the main circuit connection structure.

[0011] The opening and closing handles of the 600mm wide MCC circuit drawer unit are also offset to the left by 62mm. The 250A and 100A circuit breakers use a center manual operating mechanism. The lateral distance between the outgoing end face of the circuit breaker and the right side plate of the unit is 230-235mm, which can meet the space requirements for contactor arrangement.

[0012] The PC circuit plug-in isolation unit assembly is completely different from the withdrawable unit assembly. It only has a unit compartment, which does not contain any units, nor does it have a propulsion mechanism or a closing interlocking mechanism. The circuit breaker is installed in the unit compartment, which provides more installation space. Moreover, the current transformer is installed on the back of the unit compartment. The installation of the circuit breaker only needs to consider the electrical clearance. Therefore, both fixed and plug-in isolation unit assemblies can use a center-operated manual mechanism for their circuit breakers.

[0013] Prior to this application, the applicant had already made breakthroughs in the PC circuit drawer unit technology with a cabinet width of 500mm. However, the 630A and 400A circuit breakers still use eccentric 68mm and 50mm manual operating mechanisms, and the main circuit connection structure process is still relatively complex.

[0014] The next step is to break through the technology of MCC circuit drawer unit with a cabinet width of 500mm, and further optimize the device layout design and main circuit connection structure within the power distribution circuit drawer unit and the MCC circuit drawer unit.

[0015] However, in the MCC circuit drawer unit, in order to meet the installation requirements of the contactor, the minimum lateral distance between the outgoing end face of the circuit breaker and the right side plate of the unit must be 200mm. However, in the 250A and 100A MCC circuit drawer units with a cabinet width of 500mm, if the off-center distance of the center C of the opening and closing handle is 62mm and the 250A and 100A circuit breakers adopt the center manual operation mechanism, the lateral distance between the outgoing end face of the circuit breaker and the right side plate of the unit is less than 150mm, which cannot meet the space requirements for the arrangement of the contactor.

[0016] In summary, the problems with existing technologies are:

[0017] 1. Circuit breakers of various specifications of drawer units use both eccentric manual operation mechanisms and center manual operation mechanisms. Moreover, the eccentric distance of the eccentric manual operation mechanism is different. Therefore, the fixed position of the circuit breaker in the unit will also become uncertain, resulting in a complex device layout design and main circuit connection structure design in the unit.

[0018] 2. The installation positions of circuit breakers of different current ratings in the drawer unit are not reasonable enough, resulting in a large amount of copper used for the connection copper busbars of the main circuit.

[0019] 3. The drawer unit of 250A and 100A MCC circuit with a cabinet width of 500mm does not have enough space to accommodate the contactor with the corresponding current, so it cannot be implemented. Utility Model Content

[0020] The technical problem to be solved by this utility model is that when the center distance of the opening and closing handle C is inconsistent with the center distance of the circuit breaker A, the circuit breaker of the original drawer unit can only adopt the eccentric manual operation mechanism, which is not conducive to the standardization of unit technology.

[0021] The further technical problem to be solved is that if the center-to-center distance of the opening and closing handle center C of the 250A and 100A MCC circuit drawer unit with a cabinet width of 500mm is 62mm and the center manual operation mechanism of the 250A and 100A circuit breaker remains unchanged, the space on the right side of the circuit breaker is too small to meet the space requirements for the arrangement of the contactor in the unit, which makes it impossible to realize the 250A and 100A MCC circuit drawer unit with a cabinet width of 500mm.

[0022] The technical solution adopted by this utility model to solve its technical problem is: an eccentric closing interlocking mechanism, comprising:

[0023] A closing interlock fixing bracket is used to fix the eccentric closing interlock mechanism and unit.

[0024] The closing interlocking traction plate has an arc-shaped traction groove. The closing interlocking traction plate is driven by the handle shaft to make the closing interlocking traction plate rotate synchronously with the handle shaft.

[0025] The closing interlocking locking plate can be installed vertically on the closing interlocking fixed bracket through a translational connection structure. The closing interlocking locking plate has a driving part, which is embedded in an arc-shaped traction groove. This driving part is used to drive the closing interlocking traction plate to move downward through the arc-shaped traction groove to perform closing interlocking.

[0026] The gear synchronous transmission mechanism is mounted on the closing interlocking fixed bracket. The gear synchronous transmission mechanism has two synchronous ends, left and right, for synchronous transmission between two parallel shafts, which are the handle shaft and the manual operation shaft, respectively. The right synchronous end is driven by the handle shaft, and the left synchronous end is driven by the manual operation shaft.

[0027] In some embodiments, the gear synchronization transmission mechanism may optionally include a handle gear, a manual gear, and a transition gear. The manual gear and the handle gear are the left and right synchronization ends of the gear synchronization transmission mechanism, respectively. The handle gear, the manual gear, and the transition gear are rotatably mounted on the closing interlocking fixing bracket. The transition gear is located between the handle gear and the manual gear and meshes with the handle gear and the manual gear, respectively.

[0028] In some embodiments, optionally, the closing interlocking traction plate has a handle shaft operation hole for inserting the handle shaft, and the closing interlocking traction plate drives the inserted handle shaft through the handle shaft operation hole.

[0029] The handle gear has a handle shaft operating hole on its shaft, which is used for the insertion of the handle shaft. The handle gear drives the handle shaft through the handle shaft operating hole.

[0030] The shaft of the hand-operated gear has a hand-operated shaft operating hole for inserting the hand-operated shaft. The hand-operated gear engages with the inserted hand-operated shaft through the hand-operated shaft operating hole.

[0031] In some embodiments, optionally, the closing interlock locking plate, the closing interlock traction plate, and the handle gear are arranged sequentially from front to back.

[0032] In some embodiments, optionally, the closing interlock fixing bracket includes a front bracket and a rear bracket, which are arranged one in front of the other. The closing interlock fixing plate is located on the front side of the front bracket, and the closing interlock traction plate, handle gear, transition gear and manual gear are located between the front bracket and the rear bracket.

[0033] In some embodiments, optionally, the front and rear sides of the closing interlocking traction plate have a circular boss and a recess, respectively. The circular boss is coaxial with the operating hole of the handle shaft and serves as the rotation shaft of the closing interlocking traction plate. The handle gear and the manual gear have gear shafts on both the front and rear sides. The front and rear supports have shaft holes. The circular boss on the front side of the closing interlocking traction plate is embedded in the shaft hole of the front support. The gear shafts on the front and rear sides of the handle gear are embedded in the recess on the rear side of the closing interlocking traction plate and the shaft hole of the rear support, respectively. The gear shafts on the front and rear sides of the manual gear are embedded in the shaft holes on the front and rear supports, respectively. The shaft of the transition gear has a shaft hole. The transition gear is fixed to the rear support by a screw passing through the shaft hole of the transition gear.

[0034] In some embodiments, optionally, the side of the handle gear has a screw hole communicating with the handle shaft operating hole, for screwing in a limit screw to axially fix the handle shaft.

[0035] In some embodiments, optionally, the closing interlock locking plate engages with the interlock slot on the position interlock mechanism via a locking part for closing interlocking. The locking part is located on the left side of the right synchronization end, and the translational connection structure between the closing interlock locking plate and the closing interlock fixed bracket is also located on the left side of the right synchronization end.

[0036] In some embodiments, optionally, the closing interlock locking plate has a plugging plate extending toward the propulsion mechanism side, used to block the operating channel of the propulsion mechanism when the closing interlock is applied.

[0037] A drawer unit includes a circuit breaker, a manual operating mechanism, a closing interlocking mechanism, and a handle shaft. The closing interlocking mechanism is the aforementioned eccentric closing interlocking mechanism. The manual operating mechanism of the circuit breaker is a central manual operating mechanism. The front end of the manual operating shaft of the central manual operating mechanism and the rear end of the handle shaft are driven and engaged with the eccentric closing interlocking mechanism. The front end of the handle shaft is driven and engaged with the opening and closing handle on the unit door.

[0038] In some embodiments, optionally, the drawer unit is an MCC circuit drawer unit, the center C of the opening and closing handle is offset to the left of the unit center B, the offset distance L1 is 30-40mm, and the center A of the circuit breaker is offset to the left of the center C of the opening and closing handle.

[0039] In some embodiments, optionally, when the drawer unit is an MCC circuit drawer unit with a cabinet width of 500mm, the leftward distance L1 is 35mm, and the leftward distance L2 between the circuit breaker center A and the opening / closing handle center C is 50mm; when the drawer unit is an MCC circuit drawer unit with a cabinet width of 600mm, the leftward distance L1 is 35mm, and the leftward distance L2 between the circuit breaker center A and the opening / closing handle center C is 50-80mm.

[0040] The beneficial effects of this utility model are: when the off-center distance of the circuit breaker center A is inconsistent with the off-center distance of the opening and closing handle center C, the opening and closing action of the opening and closing handle can be eccentrically switched to the circuit breaker center A by adopting this eccentric closing interlocking mechanism, so that the circuit breaker can use the central manual operation mechanism instead of the eccentric manual operation mechanism, and realize the high standardization of unit technology.

[0041] Currently, the maximum leftward offset of the manual operating shaft of the eccentric manual operating mechanism relative to the center A of the circuit breaker is limited by the horizontal width of the circuit breaker. However, the eccentric adjustment range of this eccentric closing interlocking mechanism is not limited by this, thus enabling a larger eccentric adjustment distance.

[0042] This breakthrough overcomes the technical feasibility of applying 250A and 100A MCC circuit drawer units with a cabinet width of 500mm, and further increases the space on the right side of the circuit breaker in MCC circuit drawer units with a cabinet width of 600mm. It also ensures that the opening and closing handles of various other drawer units mixed in with the switchgear equipment are installed in the same position on the unit door. Attached Figure Description

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0044] Figure 1 This is a state diagram of the closing interlocking mechanism within the unit during the opening state in Embodiment 1;

[0045] Figure 2This is a plan view of the PC loop drawer unit with a cabinet width of 500mm in Example 1;

[0046] Figure 3 This is a front view structural diagram of the front support assembly of the closing interlocking mechanism in Example 2;

[0047] Figure 4 This is a rear-view structural diagram of the front support assembly of the closing interlocking mechanism in Example 2;

[0048] Figure 5 This is a front view structural diagram of the rear support assembly of the closing interlocking mechanism in Example 2;

[0049] Figure 6 This is a rear-view structural diagram of the rear support assembly of the closing interlocking mechanism in Example 2;

[0050] Figure 7 This is a first-dimensional structural diagram of the closing interlocking mechanism in Embodiment 2;

[0051] Figure 8 This is a second-dimensional structural diagram of the closing interlocking mechanism in Embodiment 2;

[0052] Figure 9 This is a front view structural diagram of the closing interlocking mechanism in Example 2;

[0053] Figure 10 for Figure 9 AA section view;

[0054] Figure 11 This is a schematic diagram of the closing interlocking mechanism for a drawer unit with a unit height of 125mm in Embodiment 2;

[0055] Figure 12 This is a schematic diagram of the closing interlock mechanism for a drawer unit with a unit height of 150mm in Embodiment 2;

[0056] Figure 13 This is a schematic diagram of the closing interlock mechanism for a drawer unit with a unit height of 200mm in Embodiment 2;

[0057] Figure 14 This is a state diagram of the closing interlocking mechanism within the unit during the opening state in Embodiment 2;

[0058] Figure 15 This is a state diagram of the closing interlocking mechanism within the unit when the position operation unlocking plate is in the pressed state, as shown in Embodiment 2.

[0059] Figure 16 This is a state diagram of the closing interlocking mechanism within the unit when the crank handle is inserted, as shown in Embodiment 2.

[0060] Figure 17 This is a state diagram of the closing interlocking mechanism within the unit during the closing state in Embodiment 2;

[0061] Figure 18 This is a plan view of the 250A MCC loop drawer unit with a cabinet width of 500mm in Example 2;

[0062] Figure 19 yes Figure 18 A schematic diagram of the unit door structure of the MCC loop drawer unit;

[0063] Figure 20 This is a plan view of the 250A MCC loop drawer unit with a cabinet width of 600mm in Example 2;

[0064] Figure 21 This is a schematic diagram of the switch cabinet panel of Example 2, which is equipped with various drawer units.

[0065] In the diagram, 1. Closing interlocking traction plate, 1-1. Arc-shaped traction groove, 1-2. Circular boss, 1-3. Concave hole, 2. Handle shaft, 3. Closing interlocking locking plate, 3-1. Drive unit, 3-2. Locking unit, 3-3. Hole blocking plate, 4. Manual operating shaft, 5. Handle gear, 6. Manual operating gear, 7. Transition gear, 8. Handle shaft operating hole, 9. Manual operating shaft operating hole, 10-1. Front bracket, 10-2. Rear bracket, 11. Gear shaft, 12. Shaft hole, 13. Limit screw, 14. Circuit breaker, 15. Opening / closing handle, 16-1. First interlocking slot, 16-2. Second interlocking slot, 17. Mounting base plate, 18. Position locking plate, 19. Push screw, 20. Hand crank, 21. Position operation unlocking plate, 22. Contactor, 23. Traction plate limit screw. Detailed Implementation

[0066] Example 1, as Figure 1 and 2 As shown, a drawer unit includes a circuit breaker 14, a manual operating mechanism, and a closing interlocking mechanism. The manual operating mechanism is a centrally operated mechanism, with the center C of the closing handle and the center A of the circuit breaker both offset to the left of the unit center B, and the leftward offset distance L is the same, ranging from 30 to 40 mm. The closing interlocking structure is activated by the manual operating shaft 4 of the manual operating mechanism. The locking part 3-2 of the closing interlocking mechanism is located on the left side of the manual operating shaft 4. Preferably, the leftward offset distance L is 35 mm.

[0067] This design allows the circuit breakers 14 of PC circuit drawer units with cabinet widths of 600mm and 500mm for all current specifications, as well as the circuit breakers 14 of MCC circuit drawer units with an A rating of 400A or higher, to adopt a central manual operating mechanism, eliminating the need for an eccentric manual operating mechanism. Furthermore, the fixed position of the circuit breaker 14 within the unit can be standardized, simplifying the unit's device layout design and main circuit connection structure design, resulting in a high degree of standardization and reduced copper usage.

[0068] The preferred leftward distance L is 35mm, which allows the connecting copper busbar on the outgoing side to be L-shaped without needing multiple bends. This simplifies the main circuit connection structure design, increases standardization, and reduces the amount of copper used.

[0069] In this paper, the leftward distance relative to the unit center B is referred to as the off-center distance. The manual operating mechanism's manual operating shaft 4 cooperates with the opening and closing handle 15 on the unit door to perform the opening and closing operations of the circuit breaker 14. When the circuit breaker 14 adopts a center-operated manual mechanism, the off-center distance of the center C of the opening and closing handle on the unit door is consistent with the off-center distance of the circuit breaker center A. That is, when the off-center distance of the circuit breaker center A is set to 35mm, the off-center distance of the center C of the opening and closing handle on the unit door is also changed from the existing 62mm to 35mm.

[0070] The drawer unit also includes a push-up mechanism and a position interlock mechanism mounted on the unit's base plate. The push-up mechanism is a hand-cranked screw-driven mechanism, installed at the front center of the unit's base plate. The position interlock mechanism is located to the left of the push-up mechanism. The unit's push-up mechanism has a height of 35mm and a width of 60mm. The positions of the push-up mechanism and the position interlock mechanism cannot be changed.

[0071] However, the closing interlocking rod of the conventional closing interlocking mechanism is on the right side of the manual operating shaft 4. When the off-center distance of the manual operating shaft 4 changes from 62mm to 35mm, the closing interlocking rod will interfere with the propulsion mechanism, making the conventional closing interlocking mechanism unusable in the drawer unit of this solution.

[0072] Therefore, the closing interlocking mechanism of this scheme plays a key role in simplifying and standardizing the main circuit connection structure of the drawer unit.

[0073] In this design, the locking part 3-2 of the closing interlock mechanism of the drawer unit is located on the left side of the manual operating shaft 4, and will not interfere with the propulsion mechanism. Specifically, the closing interlock mechanism adopts a locking plate type closing interlock structure. This structure uses a closing interlock locking plate 3, which moves downwards on the closing interlock bracket under the drive of the manual operating shaft 4, to perform the closing interlock. The locking part 3-2 is located on the closing interlock locking plate 3. The translational connection structure between the closing interlock locking plate 3 and the closing interlock bracket is also located on the left side of the manual operating shaft 4.

[0074] In 630A or 400A MCC circuit drawer units, the space required for the contactor 22 is located above the circuit breaker 14. Therefore, the lateral space between the outgoing end face of the circuit breaker 14 and the right side panel of the unit does not need to consider the installation of the contactor 22. Thus, the above solution can also be used for MCC circuit drawer units of 400A and above. However, in 250A and 100A MCC circuit drawer units, the contactor 22 needs to be installed in the lateral space between the outgoing end face of the circuit breaker 14 and the right side panel of the unit. To accommodate the contactor 22, the minimum lateral distance between the outgoing end face of the circuit breaker 14 and the right side panel of the unit must be 200mm. However, in MCC circuit drawer units with cabinet widths of 600mm and 500mm, if the 250A and 100A circuit breaker 14 uses a center-operated mechanism, the lateral distance between the outgoing end face of the circuit breaker 14 and the right side panel of the unit is less than 200mm, which does not meet the space requirements for the contactor 22.

[0075] To ensure uniformity in the installation position of the opening and closing handles on the unit door when various drawer units are mixed in switchgear equipment, the following specific implementation method is proposed to break through the technology of 250A and 100A MCC circuit drawer units, especially the technology of MCC circuit drawer units with a cabinet width of 500mm.

[0076] Example 2, as Figures 3-13 As shown, an eccentric closing interlocking mechanism includes:

[0077] A closing interlock fixing bracket is used to fix the eccentric closing interlock mechanism and unit.

[0078] The closing interlocking traction plate 1 has an arc-shaped traction groove 1-1. The closing interlocking traction plate 1 is driven to cooperate with the handle shaft 2 to make the closing interlocking traction plate 1 rotate synchronously with the handle shaft 2.

[0079] The closing interlocking locking plate 3 is mounted on the closing interlocking fixed bracket by means of a translational connection structure. The closing interlocking locking plate 3 has a driving part 3-1, which is embedded in an arc-shaped traction groove 1-1. The driving part 3-1 is used to drive the closing interlocking locking plate 3 downward through the arc-shaped traction groove 1-1 to perform closing interlocking.

[0080] The gear synchronous transmission mechanism is mounted on the closing interlocking fixed bracket. The gear synchronous transmission mechanism has two synchronous ends, left and right, for synchronous transmission between two parallel shafts, namely the handle shaft 2 and the manual shaft 4. The right synchronous end is driven by the handle shaft 2, and the left synchronous end is driven by the manual shaft 4.

[0081] The gear synchronization transmission mechanism includes a handle gear 5, a manual gear 6, and a transition gear 7. The manual gear 6 and the handle gear 5 are the left and right synchronization ends of the gear synchronization transmission mechanism, respectively. The handle gear 5, the manual gear 6, and the transition gear 7 are rotatably mounted on the closing interlocking fixed bracket. The transition gear 7 is located between the handle gear 5 and the manual gear 6 and meshes with both of them. Of course, it is not ruled out that the gear synchronization transmission mechanism can also adopt other structural forms, such as omitting the transition gear 7 and having the handle gear 5 and the manual gear 6 directly mesh for transmission.

[0082] The closing interlocking traction plate 1 has a handle shaft operation hole 8, which is used for the insertion of the handle shaft 2. The closing interlocking traction plate 1 is driven to cooperate with the inserted handle shaft 2 through the handle shaft operation hole 8.

[0083] The handle gear 5 has a handle shaft operation hole 8 on its shaft. The handle shaft operation hole 8 is used for the insertion of the handle shaft 2. The handle gear 5 drives the inserted handle shaft 2 through the handle shaft operation hole 8.

[0084] The shaft of the manual gear 6 has a manual shaft operating hole 9, which is used for the insertion of the manual shaft 4. The manual gear 6 drives the manual shaft 4 through the manual shaft operating hole 9.

[0085] In this embodiment, both the handle shaft 2 and the manual shaft 4 are square rods, and correspondingly, the handle shaft operation hole 8 and the manual shaft operation hole 9 are also square holes, used to achieve driving engagement between them.

[0086] The closing interlock locking plate 3, the closing interlock traction plate 1, and the handle gear 5 are arranged sequentially from front to back.

[0087] The closing interlock fixing bracket includes a front bracket 10-1 and a rear bracket 10-2, which are arranged one behind the other. The closing interlock fixing plate is located on the front side of the front bracket 10-1. The closing interlock traction plate 1, handle gear 5, transition gear 7, and manual gear 6 are located between the front bracket 10-1 and the rear bracket 10-2. The rear bracket 10-2 is mounted on the front bracket 10-1 with screws.

[0088] The front and rear sides of the closing interlocking traction plate 1 have a circular boss 1-2 and a concave hole 1-3, respectively. The circular boss 1-2 is coaxial with the operating hole 8 of the handle shaft and is used as the rotating shaft of the closing interlocking traction plate 1. The front and rear sides of the handle gear 5 and the manual gear 6 have gear shafts 11. The front bracket 10-1 and the rear bracket 10-2 have shaft holes 12. The circular boss 1-2 on the front side of the closing interlocking traction plate 1 is embedded in the shaft hole 12 of the front bracket 10-1. The gear shafts 11 on the front and rear sides of the handle gear 5 are embedded in the concave hole 1-3 on the rear side of the closing interlocking traction plate 1 and the shaft hole 12 of the rear bracket 10-2, respectively. The gear shafts 11 on the front and rear sides of the manual gear 6 are embedded in the shaft holes 12 on the front bracket 10-1 and the rear bracket 10-2, respectively. The shaft of the transition gear 7 has a shaft hole 12. The transition gear 7 is fixed to the rear bracket 10-2 by screws passing through the shaft hole 12 of the transition gear 7.

[0089] The side of the handle gear 5 has a screw hole that communicates with the handle shaft operation hole 8, which is used to screw in the limit screw 13 to fix the handle shaft 2 axially.

[0090] The closing interlocking locking plate 3 engages with the interlocking slot on the position interlocking mechanism via the locking part 3-2 for closing interlocking. The locking part 3-2 is located on the left side of the right synchronization end. The translational connection structure between the closing interlocking locking plate 3 and the closing interlocking fixed bracket is also located on the left side of the right synchronization end. The translational connection structure is specifically a sliding groove type connection structure.

[0091] The drive part 3-1 of the closing interlock locking plate 3 has a limiting end located on the outer side of the closing interlock traction plate 10; the front bracket 10-1 of the closing interlock bracket has a traction plate limiting screw 23, the screw shank of the traction plate limiting screw 23 is located on the outer side of the edge of the closing interlock traction plate 10, and the screw head of the traction plate limiting screw 23 blocks the closing interlock traction plate 10, which, together with the drive part 3-1, limits the closing interlock traction plate 10 in both the vertical and horizontal directions. Both the drive part 3-1 and the traction plate limiting screw 23 are stepped screws.

[0092] To meet specific user requirements, the closing interlock locking plate 3 has a blocking plate 3-3 extending towards the propulsion mechanism. This blocking plate is used to obstruct the operating channel of the propulsion mechanism during closing interlocking, specifically blocking the operating hole of the propulsion screw 19. The crank handle 20 cannot be inserted into the operating hole of the propulsion screw 19.

[0093] but, Figure 11 As shown, the closing interlock locking plate 3 may also be without the plugging plate 3-3. Even without the plugging plate 3-3, the crank handle 20 cannot be cranked because of the locking effect of the position locking plate 18 of the closing interlock mechanism on the propulsion mechanism. Meanwhile... Figure 11The closing interlock mechanism shown can also be used for manually operated drawer units, which do not have a push mechanism.

[0094] The hand-operated shaft 4 is on the same horizontal plane as the handle shaft 2.

[0095] When the offset distance between the center A of the circuit breaker and the offset distance between the center C of the opening and closing handle are inconsistent, the opening and closing action of the opening and closing handle 15 can be eccentrically switched to the center A of the circuit breaker by adopting this eccentric closing interlocking mechanism, so that the circuit breaker 14 can use the center manual operation mechanism instead of the eccentric manual operation mechanism.

[0096] Meanwhile, the maximum leftward distance of the manual operating shaft 4 of the eccentric manual operating mechanism relative to the center A of the circuit breaker is limited by the horizontal width of the circuit breaker 14, while the eccentric adjustment range of this eccentric closing interlocking mechanism is not limited by this, thus enabling a larger eccentric adjustment distance.

[0097] For example, limited by the horizontal width of the 250A circuit breaker 14, the maximum leftward distance of the manual operating shaft 4 of the eccentric manual operating mechanism for the 250A circuit breaker 14 relative to the circuit breaker center A is only 35mm. When the required leftward distance of the circuit breaker center A relative to the opening and closing handle exceeds 35mm, only the eccentric closing interlocking mechanism of this embodiment 2 can be used, and the eccentric manual operating mechanism cannot be used as a substitute.

[0098] like Figures 14-19 As shown, a drawer unit is a 250A cabinet-wide 500mm MCC circuit drawer unit, including a circuit breaker 14, a manual operating mechanism, a closing interlocking mechanism, and a handle shaft 2. The closing interlocking mechanism is the aforementioned eccentric closing interlocking mechanism. The manual operating mechanism of the circuit breaker 14 is a central manual operating mechanism. The front end of the manual operating shaft 4 of the central manual operating mechanism and the rear end of the handle shaft 2 are driven and engaged with the eccentric closing interlocking mechanism. The front end of the handle shaft 2 is driven and engaged with the opening and closing handle 15 on the unit door.

[0099] Specifically, the front end of the manual operating shaft 4 of the central manual operating mechanism is inserted into the manual operating shaft operating hole 9 of the eccentric closing interlocking mechanism, the rear end of the handle shaft 2 is inserted into the handle shaft operating hole 8 of the closing interlocking traction plate 1 and the handle gear 5, and the front end of the handle shaft 2 cooperates with the opening and closing handle 15 on the unit door for transmission between the opening and closing handle 15 and the manual operating shaft 4.

[0100] To ensure uniform installation of the closing and opening handles 15 on the unit door when various drawer units are mixed in the switchgear equipment, the center-offset distance of the center C of the closing and opening handle of the MCC circuit drawer unit in this embodiment 2 is the same as that of the center-offset distance of the center C of the closing and opening handle of the PC circuit drawer unit mentioned above. When the center-offset distance of the center C of the closing and opening handle of the PC circuit drawer unit mentioned above is 30-40mm, and preferably 35mm, the center C of the closing and opening handle of the MCC circuit drawer unit in this embodiment 2 is also offset to the left compared to the unit center B, with a left offset distance L1 of 30-40mm, and preferably 35mm. Since the handle shaft 2 cooperates with the closing and opening handle 15 on the unit door to perform the closing and opening operation of the circuit breaker 14, the center-offset distance of the handle shaft 2 is the same as that of the center-offset distance of the center C of the closing and opening handle, that is, the center-offset distance of the handle shaft 2 is also 30-40mm, and preferably 35mm.

[0101] Meanwhile, in order to meet the installation requirements of contactor 22, the lateral distance between the outgoing end face of circuit breaker 14 and the right side plate of the unit must be at least 200mm. The off-center distance of the circuit breaker center A needs to be greater than the off-center distance of the opening and closing handle center C. By adopting this eccentric closing interlocking mechanism, the opening and closing action of the opening and closing handle 15 can be eccentrically switched to the circuit breaker center A.

[0102] The distance L2 between the center A of the circuit breaker and the center C of the opening / closing handle is approximately 50mm to the left. Because the manual operating mechanism is a center-operated mechanism, the distance L2 between the manual operating shaft 4 and the center C of the opening / closing handle is the same as the distance L2 between the center A of the circuit breaker and the center C of the opening / closing handle.

[0103] Because the leftward distance between the center A of the circuit breaker and the center C of the opening and closing handle is required to exceed 35mm, the drawer unit of this embodiment 2 can only use the eccentric closing interlocking mechanism of this embodiment 2, and cannot be replaced by the eccentric manual operating mechanism.

[0104] like Figure 18 As shown, when circuit breaker 14 is a 250A circuit breaker and the left offset distance L2 is 50mm, by adopting an eccentric closing interlocking mechanism with a left offset distance of 50mm, the lateral distance between the outgoing end face of circuit breaker 14 and the right side plate of the unit in the 500mm wide MCC circuit drawer unit can be 202.5mm, which meets the arrangement requirements of 105A contactor 22. Based on the feasibility of 250A circuit breaker 14, 100A and 63A circuit breakers 14 are naturally also feasible.

[0105] Based on the feasibility of MCC circuit drawer units with a cabinet width of 500mm, it is also possible to simultaneously implement MCC circuit drawer units with a cabinet width of 600mm. Furthermore, the unit height can be controlled within 200mm. In the case of a 600mm wide MCC circuit drawer unit, the leftward offset L2 between the circuit breaker center A and the opening / closing handle center C is 50-80mm.

[0106] The position interlocking mechanism of the drawer unit includes a mounting base plate 17 and a position locking plate 18. The mounting base plate 17 has a first interlocking slot 8. The position locking plate 18 is slidably mounted on the mounting base plate 17 to lock the push screw 19 of the push mechanism. The position locking plate 18 has a second interlocking slot 9 that matches the first interlocking slot 8. When the position locking plate 18 is in the locked position, the first interlocking slot 8 and the second interlocking slot 9 coincide.

[0107] like Figure 14 As shown, when the circuit breaker 14 is in the open state, the locking part 3-2 of the closing interlocking mechanism is disengaged from the interlocking slots of the position interlocking mechanism, namely the first interlocking slot 16-1 and the second interlocking slot 16-2. The position interlocking mechanism is in the unlockable state, and the operating hole of the push screw 19 is exposed. At this time, the circuit breaker 14 can be closed, or the crank handle 20 can be inserted into the operating hole of the push screw 19.

[0108] like Figure 15 As shown, the circuit breaker 14 is in the open state, and the position operation unlocking plate 21 of the position interlocking mechanism is in the pressed state. At this time, the circuit breaker 14 cannot be closed.

[0109] like Figure 16 As shown, the circuit breaker 14 is in the open state, the position operation unlocking plate 21 is in the reset state, and the crank handle 20 is inserted into the operating hole of the push screw 19. Because of the obstruction of the crank handle 20, the circuit breaker 14 cannot be closed at this time.

[0110] like Figure 17 As shown, when the circuit breaker 14 is in the closed state, the locking part 3-2 of the closing interlocking mechanism enters the first interlocking slot 16-1 and the second interlocking slot 16-2 of the position interlocking mechanism. The position operation unlocking plate 21 cannot be pressed to unlock, the plugging plate 3-2 blocks the operation hole of the push screw 19, and the crank handle 20 cannot be inserted, thus completely eliminating the risk of the crank handle 20 being forcibly operated when closing.

[0111] Figure 18 It is a 250A MCC loop drawer unit with a cabinet width of 500mm. Figure 20 For each 250A MCC drawer unit with a cabinet width of 600mm, the corresponding circuit breaker 14 is also a 250A circuit breaker. For example... Figure 21As shown, when various drawer units are mixed in the switch cabinet equipment, the installation position of the opening and closing handle 15 on the unit door is uniform, and the off-center distance of the center C of the opening and closing handle is 35mm.

[0112] By replacing the existing MCC circuit drawer unit with a cabinet width of 600mm and a 62mm off-center opening / closing handle, the 500mm wide MCC circuit drawer unit of this embodiment 2, with the same current specifications and functions, can reduce the amount of copper used in the horizontal busbar of the switchgear equipment, reduce the equipment footprint by 0.1㎡, and save 5.22kg of copper in the 2500A horizontal busbar of one unit. In the prior art, the application of MCC circuit drawer units for 22kVA motors accounts for more than 50%. If 100% of the 600mm wide MCC circuit drawer unit is replaced, great economic value can be achieved.

[0113] For MCC circuit drawer units of different specifications, only the height of the eccentric closing interlocking mechanism needs to be adjusted to match, without changing the structural form of the eccentric closing interlocking mechanism.

[0114] When a switchgear unit has both a power distribution circuit drawer unit and an MCC circuit drawer unit, the center-offset distance of the opening and closing handle C is 35mm, so that the installation position of the opening and closing handle 15 on the unit door is uniform.

[0115] This closing interlocking mechanism has no restrictions on the structural type of the propulsion mechanism and the position interlocking mechanism, and there are no restrictions on the structural type of the drawer unit.

[0116] Compared to traditional closing interlocking mechanisms that use a closing interlocking lever for closing interlocking, the closing interlocking position of this closing interlocking mechanism is located on the left side of the handle shaft 2, avoiding the propulsion mechanism. At the same time, the closing interlocking locking plate 3 and the interlocking slot of the position interlocking mechanism are locked without obstruction, so that the closing interlocking is performed. That is, when the circuit breaker 14 closes or trips abnormally, the closing interlocking locking plate 3 is not obstructed, so that the rotation of the opening and closing handle 15 to the TRIP indication is not affected.

[0117] The drawer unit of this utility model can be either a drawer unit with a closing operation or a drawer unit with an opening and closing operation.

[0118] The drawer units in embodiments 1 and 2 are also referred to as economical drawer units in the prior art. The drawer unit of this utility model can also be a movable drawer unit, achieving the same technical effect. When the drawer unit is specifically a movable drawer unit, the corresponding manual operating lever 4 adopts a telescopic manual operating lever.

Claims

1. An eccentric closing interlocking mechanism, characterized in that, include: A closing interlock fixing bracket is used to fix the eccentric closing interlock mechanism and unit. The closing interlocking traction plate (1) has an arc-shaped traction groove (1-1) on it. The closing interlocking traction plate (1) is driven to cooperate with the handle shaft (2) to make the closing interlocking traction plate (1) rotate synchronously with the handle shaft (2). The closing interlock locking plate (3) is installed on the closing interlock fixing bracket by means of a translational connection structure. The closing interlock locking plate (3) has a driving part (3-1) embedded in an arc-shaped traction groove (1-1) to drive the closing interlock locking plate (3) downward through the arc-shaped traction groove (1-1) to perform closing interlock. The gear synchronous transmission mechanism is installed on the closing interlocking fixed bracket. The gear synchronous transmission mechanism has two synchronous ends, left and right, for synchronous transmission between two parallel shafts. The two parallel shafts are the handle shaft (2) and the manual shaft (4), respectively. The right synchronous end is driven by the handle shaft (2), and the left synchronous end is driven by the manual shaft (4).

2. The eccentric closing interlocking mechanism according to claim 1, characterized in that: The gear synchronization transmission mechanism includes a handle gear (5), a manual gear (6), and a transition gear (7). The manual gear (6) and the handle gear (5) are the left and right synchronization ends of the gear synchronization transmission mechanism, respectively. The handle gear (5), the manual gear (6), and the transition gear (7) are rotatably mounted on the closing interlocking fixed bracket. The transition gear (7) is located between the handle gear (5) and the manual gear (6) and meshes with the handle gear (5) and the manual gear (6) respectively.

3. The eccentric closing interlocking mechanism according to claim 2, characterized in that: The closing interlocking traction plate (1) has a handle shaft operation hole (8), which is used for the insertion of the handle shaft (2). The closing interlocking traction plate (1) is driven to cooperate with the inserted handle shaft (2) through the handle shaft operation hole (8). The handle gear (5) has a handle shaft operation hole (8) at its shaft center. The handle shaft operation hole (8) is used for the insertion of the handle shaft (2). The handle gear (5) drives the inserted handle shaft (2) through the handle shaft operation hole (8). The shaft of the manual gear (6) has a manual shaft operation hole (9), which is used for the insertion of the manual shaft (4). The manual gear (6) drives the manual shaft (4) through the manual shaft operation hole (9).

4. The eccentric closing interlocking mechanism according to claim 2, characterized in that: The closing interlock locking plate (3), closing interlock traction plate (1), and handle gear (5) are arranged sequentially from front to back.

5. The eccentric closing interlocking mechanism according to claim 3, characterized in that: The closing interlock fixing bracket includes a front bracket (10-1) and a rear bracket (10-2), which are arranged one in front of the other. The closing interlock fixing plate is located on the front side of the front bracket (10-1), and the closing interlock traction plate (1), handle gear (5), transition gear (7) and manual gear (6) are located between the front bracket (10-1) and the rear bracket (10-2).

6. The eccentric closing interlocking mechanism according to claim 5, characterized in that: The front and rear sides of the closing interlocking traction plate (1) have a circular boss (1-2) and a recess (1-3) respectively. The circular boss (1-2) is coaxial with the operating hole (8) of the handle shaft and serves as the rotating shaft of the closing interlocking traction plate (1). The handle gear (5) and the manual gear (6) have gear shafts (11) on both the front and rear sides. The front bracket (10-1) and the rear bracket (10-2) have shaft holes (12). The circular boss (1-2) on the front side of the closing interlocking traction plate (1) is embedded in the shaft hole of the front bracket (10-1). 12) The gear shafts (11) on the front and rear sides of the handle gear (5) are respectively embedded in the recess (1-3) on the rear side of the closing interlock traction plate (1) and the shaft hole (12) of the rear bracket (10-2). The gear shafts (11) on the front and rear sides of the hand-operated gear (6) are respectively embedded in the shaft hole (12) on the front bracket (10-1) and the rear bracket (10-2). The shaft of the transition gear (7) has a shaft hole (12). The transition gear (7) is fixed to the rear bracket (10-2) by a screw passing through the shaft hole (12) of the transition gear (7).

7. The eccentric closing interlocking mechanism according to claim 3, characterized in that: The side of the handle gear (5) has a screw hole that communicates with the handle shaft operation hole (8) for screwing in a limit screw (13) to axially fix the handle shaft (2).

8. The eccentric closing interlocking mechanism according to claim 1, characterized in that: The closing interlock locking plate (3) engages with the interlock slot on the position interlocking mechanism through the locking part (3-2) to perform closing interlocking. The locking part (3-2) is located on the left side of the right synchronization end. The translational connection structure between the closing interlock locking plate (3) and the closing interlock fixed bracket is also located on the left side of the right synchronization end.

9. The eccentric closing interlocking mechanism according to claim 1, characterized in that: The closing interlock locking plate (3) has a plugging plate (3-3) extending to the side of the propulsion mechanism, which is used to block the operation channel of the propulsion mechanism when the closing interlock is applied.

10. A drawer unit, comprising a circuit breaker (14), a manual operating mechanism, a closing interlocking mechanism, and a handle shaft (2), wherein the closing interlocking mechanism is the eccentric closing interlocking mechanism as described in claim 1, the manual operating mechanism of the circuit breaker (14) is a central manual operating mechanism, the front end of the manual operating shaft (4) of the central manual operating mechanism and the rear end of the handle shaft (2) are driven to cooperate with the eccentric closing interlocking mechanism, and the front end of the handle shaft (2) is driven to cooperate with the opening and closing handle (15) on the unit door.

11. The drawer unit according to claim 10, characterized in that: The drawer unit is an MCC circuit drawer unit. The center C of the opening and closing handle is offset to the left of the unit center B, and the offset distance L1 is 30-40mm. The center A of the circuit breaker is offset to the left of the center C of the opening and closing handle.

12. The drawer unit according to claim 11, characterized in that: When the drawer unit is an MCC circuit drawer unit with a cabinet width of 500mm, the leftward distance L1 is 35mm, and the leftward distance L2 between the center A of the circuit breaker and the center C of the opening and closing handle is 50mm. When the drawer unit is an MCC circuit drawer unit with a cabinet width of 600mm, the leftward distance L1 is 35mm, and the leftward distance L2 between the center A of the circuit breaker and the center C of the opening and closing handle is 50-80mm.

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