Drawer unit

Abstract

This utility model relates to the field of low-voltage switchgear technology, specifically a drawer unit, including a circuit breaker, a manual operating mechanism, and a closing interlocking mechanism. The manual operating mechanism of the circuit breaker is a central manual operating mechanism, with the center of the opening / closing handle and the center A of the circuit breaker both offset to the left relative to the center B of the unit, and the left offset distance L is the same. When the drawer unit is a 600mm wide drawer unit, the left offset distance L is 30-50mm; when the drawer unit is a 500mm wide drawer unit, the left offset distance L is 30-40mm. The locking part of the closing interlocking mechanism is located on the left side of the manual operating shaft. The beneficial effects are: all current specifications of circuit breakers in PC circuit drawer units with cabinet widths of 600mm and 500mm can use a central manual operating mechanism, eliminating the need for an eccentric manual operating mechanism; the fixed position of the circuit breaker center within the unit can also be standardized, simplifying the unit's component layout design and main circuit connection structure design, increasing standardization, and reducing copper usage, with the main circuit connection structure saving 8.8% of copper.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage switchgear technology, and in particular to a 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, corresponding to the current ratings of the circuit breakers. 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 the existing technology, in order to ensure that the installation position of the opening and closing handles on the unit door is uniform when various drawer units are mixed in the switchgear equipment, 630A and 400A circuit breakers use an eccentric manual operating mechanism, while 250A, 100A, and 63A circuit breakers mostly use a center manual operating mechanism. 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.

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

[0012] In summary, the problems with existing technologies are:

[0013] 1. The eccentric manual operating mechanism and the central manual operating mechanism are used in combination, and the eccentric distance of the eccentric manual operating mechanism is different. Therefore, the fixed position of the circuit breaker in the unit will also become uncertain, which leads to the complex design of the device layout and the main circuit connection structure in the unit.

[0014] 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.

[0015] 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. Utility Model Content

[0016] The technical problem to be solved by this utility model is that the existing drawer unit requires an eccentric manual operation mechanism, which makes the device layout design and main circuit connection structure design within the unit complicated and also requires a large amount of copper.

[0017] The technical solution adopted by this utility model to solve its technical problem is as follows: a drawer unit, including a circuit breaker, a manual operating mechanism, and a closing interlocking mechanism. The manual operating mechanism of the circuit breaker is a central manual operating mechanism. The center of the opening and closing handle and the center A of the circuit breaker are both offset to the left relative to the center B of the unit, and the offset distance L is the same. When the drawer unit is a drawer unit with a cabinet width of 600mm, the offset distance L is 30-50mm. When the drawer unit is a drawer unit with a cabinet width of 500mm, the offset distance L is 30-40mm. The closing interlocking structure is driven by the manual operating shaft of the manual operating mechanism to perform closing interlocking. The locking part of the closing interlocking mechanism is located on the left side of the manual operating shaft.

[0018] In some embodiments, the leftward offset distance L is optionally 35 mm.

[0019] In some embodiments, the closing interlocking mechanism may be a locking plate type closing interlocking structure. The locking plate type closing interlocking structure performs closing interlocking by a closing interlocking locking plate that moves downward on the closing interlocking bracket under the drive of a manual shaft. The locking part is located on the closing interlocking locking plate.

[0020] In some embodiments, optionally, the closing interlock locking plate is located in front of the closing interlock bracket.

[0021] In some embodiments, the drawer unit may optionally be a 630A, 400A, 250A, 100A, or 63A drawer unit.

[0022] In some embodiments, the drawer unit may optionally be a 630A, 400A, 250A, 100A, or 63A movable drawer unit.

[0023] 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.

[0024] In some embodiments, optionally, the closing interlocking mechanism includes a closing interlocking bracket, a closing interlocking traction plate, and a closing interlocking locking plate. The closing interlocking mechanism is installed in the unit via the closing interlocking bracket. The closing interlocking traction plate has an arc-shaped traction groove. The closing interlocking traction plate is driven to cooperate with the manual operating shaft to make the closing interlocking traction plate rotate synchronously with the manual operating shaft. The closing interlocking locking plate is slidably installed on the closing interlocking bracket via a translational connection structure. The closing interlocking locking plate has a driving part, which is embedded in the arc-shaped traction groove to drive the closing interlocking traction plate to move downward through the arc-shaped traction groove to perform closing interlocking.

[0025] In some embodiments, optionally, the closing interlocking traction plate has a manual operating shaft operating hole for inserting a manual operating shaft. The closing interlocking traction plate drives the inserted manual operating shaft through the manual operating shaft operating hole. The closing interlocking traction plate has a circular boss coaxial with the manual operating shaft operating hole. The closing interlocking bracket has a shaft hole that mates with the circular boss. The circular boss is embedded in the shaft hole for rotating and positioning the closing interlocking traction plate.

[0026] In some embodiments, optionally, the locking part of the closing interlock locking plate cooperates with the interlock slot on the position interlock mechanism for closing interlocking; the translational connection structure between the closing interlock locking plate and the closing interlock bracket is located on the left side of the manual operating shaft; the end of the driving part of the closing interlock locking plate located outside the closing interlock traction plate has a limiting end; the closing interlock bracket has a traction plate limiting screw, the screw shank of the traction plate limiting screw is located outside the edge of the closing interlock traction plate, and the screw head of the traction plate limiting screw blocks the closing interlock traction plate, which, together with the driving part, limits the closing interlock traction plate in the upper and lower directions.

[0027] The beneficial effects of this utility model are: it enables all current specifications of circuit breakers in PC circuit drawer units with cabinet widths of 600mm and 500mm, as well as 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 within the unit can be standardized, simplifying the device layout design and main circuit connection structure design of the unit, achieving high standardization, and reducing copper usage. The main circuit connection structure saves 8.8% of copper, and the copper saving is higher than the selling price of the closing interlocking mechanism itself.

[0028] This closing interlocking mechanism can be applied to PC circuit drawer units of all current levels, and there are no restrictions on the structural type of the propulsion mechanism and position interlocking mechanism, nor on the structural form of the drawer unit.

[0029] Compared to traditional closing interlocking mechanisms that use a closing interlocking lever for closing interlocking, the closing interlocking position of this closing interlocking mechanism can be located on the left side of the manual operating shaft, avoiding the propulsion mechanism. At the same time, the closing interlocking locking plate and the interlocking slot of the position interlocking mechanism are locked together without jamming, so that the closing interlocking can be performed without obstruction. That is, when the circuit breaker closes or trips abnormally, the closing interlocking locking plate is not obstructed, so that turning the opening and closing handle to the TRIP indicator has no effect. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0031] Figure 1 This is a front view structural diagram of the closing interlock bracket in Example 1;

[0032] Figure 2 This is a rear-view structural diagram of the closing interlock bracket in Example 1;

[0033] Figure 3 This is a schematic diagram of the closing interlocking traction plate in Example 1;

[0034] Figure 4 This is a schematic diagram of the closing interlocking locking plate in Example 1;

[0035] Figure 5 This is a front-view structural schematic diagram of the closing interlocking mechanism in Embodiment 1;

[0036] Figure 6 This is a rear-view structural schematic diagram of the closing interlocking mechanism of Embodiment 1;

[0037] Figure 7 This is a schematic diagram of the closing interlocking mechanism for a drawer unit with a unit height of 100mm, as described in Embodiment 1.

[0038] Figure 8 This is a schematic diagram of the closing interlocking mechanism for a drawer unit with a unit height of 125mm, as described in Embodiment 1.

[0039] Figure 9 This is a schematic diagram of the closing interlocking mechanism for a drawer unit with a unit height of 150mm, as described in Embodiment 1.

[0040] Figure 10 This is a schematic diagram of the closing interlocking mechanism for a drawer unit with a unit height of 200mm in Embodiment 1;

[0041] Figure 11 This is a schematic diagram of the closing interlocking mechanism for a drawer unit with a unit height of 300mm, as described in Embodiment 1.

[0042] Figure 12 This is a state diagram of the closing interlocking mechanism within the unit during the opening state in Embodiment 1;

[0043] Figure 13 This is a state diagram of the closing interlocking mechanism within the unit when the position operation unlocking plate of Embodiment 1 is in the pressed state;

[0044] Figure 14 This is a state diagram of the closing interlocking mechanism within the unit when the crank handle is inserted, as shown in Embodiment 1.

[0045] Figure 15 This is a state diagram of the closing interlocking mechanism within the unit during the closing state in Embodiment 1;

[0046] Figure 16 This is a plan view of the PC loop drawer unit with a cabinet width of 500mm for the 250A in Example 1;

[0047] Figure 17 This is a plan view of the PC loop drawer unit with a cabinet width of 500mm for the 630A and 400A models in Example 1.

[0048] Figure 18 This is a plan view of the PC loop drawer unit with a cabinet width of 600mm for the 250A in Example 1;

[0049] Figure 19 This is a plan view of the PC loop drawer unit with a cabinet width of 600mm for the 630A and 400A models in Example 1.

[0050] Figure 20 This is a schematic diagram of the structure of the unit door of the drawer unit in Embodiment 1;

[0051] Figure 21 This is a schematic diagram of the switch cabinet panel equipped with drawer units of different current specifications according to Example 1;

[0052] In the diagram, 1. Circuit breaker, 2. Manual operating shaft, 3. Opening / closing handle, 4. Closing interlock locking plate, 4-1. Drive unit, 4-2. Plug plate, 4-3. Locking unit, 5. Closing interlock bracket, 5-1. Shaft hole, 6. Mounting base plate, 7. Position locking plate, 8. First interlock slot, 9. Second interlock slot, 10. Closing interlock traction plate, 10-1. Manual operating shaft operating hole, 10-2. Arc-shaped traction groove, 10-3. Circular boss, 11. Traction plate limit screw, 12. Position operation unlocking plate, 13. Push screw, 14. Crank handle. Detailed Implementation

[0053] Example 1, as Figures 12-21 As shown, a drawer unit, which is a PC circuit drawer unit, includes a circuit breaker 1, a manual operating mechanism, and a closing interlocking mechanism. The manual operating mechanism is a center-operated mechanism, with the center of the opening / 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. When the drawer unit has a cabinet width of 600mm, the leftward offset distance L is 30-50mm; when the drawer unit has a cabinet width of 500mm, the leftward offset distance L is 30-40mm. The closing interlocking structure is driven by the manual operating shaft 2 of the manual operating mechanism for closing interlocking. The locking part 4-3 of the closing interlocking mechanism is located to the left of the manual operating shaft 2. Preferably, the leftward offset distance L is 35mm.

[0054] This design allows the circuit breaker 1 of PC circuit drawer units with cabinet widths of 600mm and 500mm for all current specifications, as well as the circuit breaker 1 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 1 within the unit can be standardized, simplifying the unit's component layout design and main circuit connection structure design, resulting in a high degree of standardization and reduced copper usage.

[0055] The closing interlocking mechanism plays a key role in simplifying and standardizing the main circuit connection structure of the PC circuit drawer unit.

[0056] 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.

[0057] In this paper, the distance to the left of the unit center B is referred to as the off-center distance. The manual operating mechanism's manual operating shaft 2 cooperates with the opening and closing handle 3 on the unit door to perform the opening and closing operations of circuit breaker 1. When circuit breaker 1 adopts a center manual operating mechanism, the off-center distance of the center 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 of the opening and closing handle on the unit door is also changed from the existing 62mm to 35mm.

[0058] 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 push-up mechanism of the unit 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.

[0059] However, in conventional closing interlocking mechanisms, the closing interlocking rod is located on the right side of the manual operating shaft 2. When the off-center distance of the manual operating shaft 2 changes from 62mm to 35mm, the closing interlocking rod will interfere with the propulsion mechanism, making it impossible to use the conventional closing interlocking mechanism in the drawer unit of this solution.

[0060] In this design, the locking part 4-3 of the closing interlock mechanism of the drawer unit is located on the left side of the manual operating shaft 2, 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 4, which moves downwards on the closing interlock bracket 5 under the drive of the manual operating shaft 2, to perform the closing interlock. The locking part 4-3 is located on the closing interlock locking plate 4. The translational connection structure between the closing interlock locking plate 4 and the closing interlock bracket 5 is also located on the left side of the manual operating shaft 2.

[0061] More specifically, the position interlocking mechanism of the drawer unit in this solution includes a mounting base plate 6 and a position locking plate 7. The mounting base plate 6 has a first interlocking slot 8. The position locking plate 7 is slidably mounted on the mounting base plate 6 to lock the push screw 13 of the push mechanism. The position locking plate 7 has a second interlocking slot 9 that matches the first interlocking slot 8. When the position locking plate 7 is in the locked position, the first interlocking slot 8 and the second interlocking slot 9 overlap.

[0062] like Figures 1-11 As shown, the closing interlocking mechanism includes a closing interlocking bracket 5, a closing interlocking traction plate 10, and a closing interlocking locking plate 4. The closing interlocking mechanism is installed in the unit via the closing interlocking bracket 5. The closing interlocking traction plate 10 has a manual operating shaft operating hole 10-1 and an arc-shaped traction groove 10-2. The manual operating shaft operating hole 10-1 is used for the insertion of the manual operating shaft 2. The closing interlocking traction plate 10 drives the inserted manual operating shaft 2 through the manual operating shaft operating hole 10-1, thereby causing the closing interlocking traction plate 10 and the manual operating shaft 2 to rotate synchronously. The closing interlocking locking plate 4 is slidably mounted on the closing interlocking bracket 5 and has a driving part. 4-1 and locking part 4-2, the driving part 4-1 is embedded in the arc-shaped traction groove 10-2, which is used to drive the closing interlocking traction plate 10 to drive the closing interlocking locking plate 4 to move downward through the arc-shaped traction groove 10-2. When the position locking plate 7 is in the locked position and the closing interlocking locking plate 4 is lowered to the lowest point, the locking part 4-2 is embedded in the first interlocking slot 8 and the second interlocking slot 9 to perform closing interlocking. The position interlocking mechanism and the propulsion mechanism are locked. When the circuit breaker 1 is in the open state, the locking part 4-2 of the position locking plate 7 disengages from the first interlocking slot 8 and the second interlocking slot 9 of the position interlocking mechanism, so that the position interlocking mechanism is in the unlockable propulsion mechanism state. In addition to the manual operating shaft operation hole 10-1, it is also possible that the closing interlocking traction plate 10 and the manual operating shaft 2 adopt other conventional cooperation methods for driving cooperation.

[0063] The closing interlock locking plate 4 is located in front of the closing interlock bracket 5, and the closing interlock traction plate 10 is located behind the closing interlock bracket 5.

[0064] The closing interlocking traction plate 10 has a circular boss 10-3, which is coaxial with the manual operating shaft operating hole 10-1. The closing interlocking bracket 5 is provided with a shaft hole 5-1 that mates with the circular boss 10-3. The circular boss 10-3 is embedded in the shaft hole 5-1 for rotating and positioning the closing interlocking traction plate 10.

[0065] The drive part 4-1 of the closing interlock locking plate 4 has a limiting end located on the outer side of the closing interlock traction plate 10; the closing interlock bracket 5 has a traction plate limiting screw 11, the screw shank of which is located on the outer side of the edge of the closing interlock traction plate 10, and the screw head of which blocks the closing interlock traction plate 10, thus limiting the closing interlock traction plate 10 in both the vertical and horizontal directions together with the drive part 4-1. Both the drive part 4-1 and the traction plate limiting screw 11 are stepped screws.

[0066] The closing interlock mechanism is mounted on the unit base plate via the closing interlock bracket 5. The mounting base plate 6 of the position interlock mechanism has a corresponding clearance opening, allowing the closing interlock bracket 5 to be mounted on the unit base plate through this clearance opening. Alternatively, the closing interlock mechanism may be mounted on the mounting base plate 6 of the position interlock mechanism via the closing interlock bracket 5. The closing interlock bracket 5 of the closing interlock mechanism is L-shaped.

[0067] To meet the specific needs of users, the closing interlock locking plate 4 has a blocking plate 4-2 extending towards the side of the propulsion mechanism, which is used to block the operation channel of the propulsion mechanism when the closing interlock is in place. Specifically, it blocks the operation hole of the propulsion screw 13 of the propulsion mechanism, so that the crank handle 14 cannot be inserted into the operation hole of the propulsion screw 13.

[0068] like Figure 12 As shown, when the circuit breaker 1 is in the open state, the locking part 4-2 of the closing interlocking mechanism is disengaged from the first interlocking slot 8 and the second interlocking slot 9 of the position interlocking mechanism, the position interlocking mechanism is in the unlockable state, and the operating hole of the push screw 13 is exposed. At this time, the circuit breaker 1 can be closed, or the crank handle 14 can be inserted into the operating hole of the push screw 13.

[0069] like Figure 13 As shown, circuit breaker 1 is in the open state, and the position operation unlocking plate 12 of the position interlocking mechanism is in the pressed state. At this time, circuit breaker 1 cannot be closed.

[0070] like Figure 14As shown, circuit breaker 1 is in the open state, position operation unlocking plate 12 is in the reset state, and crank handle 14 is inserted into the operating hole of push screw 13. Because of the obstruction of crank handle 14, circuit breaker 1 cannot be closed at this time.

[0071] like Figure 15 As shown, when the circuit breaker 1 is in the closed state, the locking part 4-2 of the closing interlocking mechanism enters the first interlocking slot 8 and the second interlocking slot 9 of the position interlocking mechanism. The position operation unlocking plate 12 cannot be pressed to unlock, the blocking plate 4-2 blocks the operation hole of the push screw 13, and the crank handle 14 cannot be inserted, thus completely eliminating the risk of the crank handle 14 being forcibly operated when closing.

[0072] However, as Figure 7 and Figure 8 As shown, the closing interlock locking plate 4 may also be without the plugging plate 4-2. Even without the plugging plate 4-2, the crank handle 14 cannot crank the propulsion mechanism because of the locking effect of the position locking plate 7 of the closing interlock mechanism on the propulsion mechanism. Meanwhile... Figure 7 and Figure 8 The closing interlock mechanism shown can also be used for manually operated drawer units, which do not have a push mechanism.

[0073] The manual operating shaft 2 is a square shaft, and the manual operating shaft operating hole 10-1 is a square hole, so as to realize the driving cooperation between the two.

[0074] Figure 16 The drawer unit is a 250A PC circuit with a cabinet width of 500mm. Correspondingly, circuit breaker 1 is a 250A circuit breaker. Figure 17 The drawer unit is a 630A or 400A PC circuit with a cabinet width of 500mm. Correspondingly, circuit breaker 1 is a 630A or 400A circuit breaker. Figure 18 It is a 250A PC loop drawer unit with a cabinet width of 600mm. Figure 19 This refers to 630A and 400A PC circuit drawer units with a cabinet width of 600mm. For example... Figures 16-21 As shown, the center-offset distance of the circuit breaker center A, the center-offset distance of the manual operating shaft 2, and the center-offset distance of the opening and closing handles of various PC circuit drawer units are all 35mm. When various drawer units are mixed in the switch cabinet equipment, the installation position of the opening and closing handles 3 on the unit door is uniform.

[0075] The drawer unit in this embodiment 1 can be either a drawer unit with a closing operation or a drawer unit with an opening and closing operation.

[0076] Example 2 is basically the same as Example 1, except that the drawer unit in Example 2 is a 630A or 400A MCC loop drawer unit.

[0077] In MCC circuit drawer units below 250A, the contactor needs to be installed in the lateral space between the outgoing terminal face of circuit breaker 1 and the right side plate of the unit. To accommodate the contactor installation, the minimum lateral distance between the outgoing terminal face of circuit breaker 1 and the right side plate of the unit must be 200mm. However, in 630A or 400A MCC circuit drawer units, the space required for contactor installation is located above the circuit breaker, so the lateral space between the outgoing terminal face of the circuit breaker and the right side plate of the unit does not need to consider the contactor installation. Therefore, the solution of this invention can also be used for MCC circuit drawer units above 400A.

[0078] The drawer units of 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 is specifically a telescopic manual operating lever.

Claims

1. A drawer unit, characterized in that: It includes a circuit breaker (1), a manual operating mechanism and a closing interlocking mechanism. The manual operating mechanism of the circuit breaker (1) is a central manual operating mechanism. The center of the opening and closing handle and the center of the circuit breaker A are both offset to the left of the unit center B, and the offset distance L is the same. When the drawer unit is a drawer unit with a cabinet width of 600mm, the offset distance L is 30-50mm. When the drawer unit is a drawer unit with a cabinet width of 500mm, the offset distance L is 30-40mm. The closing interlocking structure is driven by the manual operating shaft (2) of the manual operating mechanism to perform closing interlocking. The locking part (4-3) of the closing interlocking mechanism is located on the left side of the manual operating shaft (2).

2. The drawer unit according to claim 1, characterized in that: The leftward deviation distance L is 35mm.

3. The drawer unit according to claim 1, characterized in that: The closing interlocking mechanism is a locking plate type closing interlocking structure. The locking plate type closing interlocking structure performs closing interlocking by moving the closing interlocking locking plate (4) downward on the closing interlocking bracket (5) under the drive of the hand-operated shaft (2). The locking part (4-3) is located on the closing interlocking locking plate (4).

4. The drawer unit according to claim 3, characterized in that: The closing interlock locking plate (4) is located in front of the closing interlock bracket (5).

5. The drawer unit according to claim 1, characterized in that: The drawer unit is a 630A, 400A, 250A, 100A, or 63A drawer unit.

6. The drawer unit according to claim 1, characterized in that: The drawer unit is a 630A, 400A, 250A, 100A or 63A movable drawer unit.

7. The drawer unit according to claim 3, characterized in that: The closing interlock locking plate (4) has a plugging plate (4-2) 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.

8. The drawer unit according to claim 3, characterized in that: The closing interlocking mechanism includes a closing interlocking bracket (5), a closing interlocking traction plate (10), and a closing interlocking locking plate (4). The closing interlocking mechanism is installed in the unit through the closing interlocking bracket (5). The closing interlocking traction plate (10) has an arc-shaped traction groove (10-2). The closing interlocking traction plate (10) is driven and cooperated with the manual operating shaft (2) to make the closing interlocking traction plate (10) rotate synchronously with the manual operating shaft (2). The closing interlocking locking plate (4) can be installed on the closing interlocking bracket (5) by a translational connection structure. The closing interlocking locking plate (4) has a driving part (4-1). The driving part (4-1) is embedded in the arc-shaped traction groove (10-2) to make the closing interlocking traction plate (10) drive the closing interlocking locking plate (4) to move downward through the arc-shaped traction groove (10-2) to perform closing interlocking.

9. The drawer unit according to claim 8, characterized in that: The closing interlocking traction plate (10) has a manual shaft operation hole (10-1), which is used for the insertion of the manual shaft (2). The closing interlocking traction plate (10) drives the inserted manual shaft (2) through the manual shaft operation hole (10-1). The closing interlocking traction plate (10) has a circular boss (10-3), which is coaxial with the manual shaft operation hole (10-1). The closing interlocking bracket (5) is provided with a shaft hole (5-1) that mates with the circular boss (10-3). The circular boss (10-3) is embedded in the shaft hole (5-1) for rotating and positioning the closing interlocking traction plate (10).

10. The drawer unit according to claim 8, characterized in that: The locking part (4-3) of the closing interlock locking plate (4) cooperates with the interlock slot on the position interlock mechanism to perform closing interlock. The translational connection structure between the closing interlock locking plate (4) and the closing interlock bracket (5) is located on the left side of the manual operating shaft (2). The end of the drive part (4-1) of the closing interlock locking plate (4) located outside the closing interlock traction plate (10) has a limiting end; The closing interlock bracket (5) has a traction plate limiting screw (11). The screw rod of the traction plate limiting screw (11) is located on the outer side of the edge of the closing interlock traction plate (10). The screw head of the traction plate limiting screw (11) blocks the closing interlock traction plate (10) and is used together with the drive unit (4-1) to limit the closing interlock traction plate (10) in the upper and lower directions.

Images