Drawer unit of a low voltage switchgear and low voltage switchgear

Abstract

The utility model discloses a drawer unit and low pressure switch cabinet of low pressure switch cabinet relates to low pressure switch cabinet technical field, wherein, drawer unit includes drawer main part and advance mechanism, operating mechanism and controller, drawer main part sets up in drawer box, and drawer main part electric connection is in low pressure switch cabinet, and drawer main part includes circuit breaker, and circuit breaker is provided with the operating shaft that can rotate between the position of opening and closing, and operating shaft is connected with one limit component, advance mechanism includes electric advance component and manual advance component, and electric advance component and manual advance component can drive drawer main body along slide rail and slide when operating shaft rotates to the position of opening, operating mechanism includes electric operating component and manual operating component, and electric operating component and manual operating component can drive operating shaft and rotate between the position of opening and closing, controller electric connection is in electric advance component and electric operating component, can effectively improve the security of drawer unit and low pressure switch cabinet.

Description

Technical Field

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

[0002] Low-voltage switchgear is an electrical device used to distribute power and control and protect low-voltage circuits. As the core component of low-voltage switchgear, the drawer unit usually adopts a drawer-type design, which can be pushed in and pulled out of the drawer box on the low-voltage switchgear, making it convenient for operators to maintain and repair the circuit breakers and other components housed in the drawer unit.

[0003] In traditional low-voltage switchgear, the pushing in and pulling out of drawer units is usually done manually, as is the switching on and off of the circuit breaker within the drawer unit. This requires on-site manual operation, which is inconvenient and labor-intensive. While some newer drawer units can be electrically pushed in and pulled out, and the circuit breaker can be electrically opened and closed, a malfunction in the electric controller can prevent the drawer unit from being pulled out and the circuit breaker from opening, posing a significant safety hazard. Utility Model Content

[0004] The main purpose of this utility model is to propose a drawer unit and a low-voltage switchgear, which aims to solve the technical problems in the prior art where manual pushing and pulling of the drawer unit and manual opening and closing of the circuit breaker in low-voltage switchgear are time-consuming and laborious, while electric pushing and pulling of the drawer unit and electric opening and closing of the circuit breaker pose safety hazards.

[0005] To achieve the above objectives, the low-voltage switchgear proposed in this utility model includes a drawer box. The drawer box contains a slide rail arranged along its extension direction. The drawer unit includes a drawer body and a push-pull mechanism, an operating mechanism, and a controller disposed on the drawer body. The drawer body is disposed within the drawer box and electrically connected to the low-voltage switchgear. The drawer body includes a circuit breaker. The circuit breaker has an operating shaft that can rotate between an open and a closed position. The operating shaft is connected to a limiting component. When the operating shaft rotates to the closed position, the limiting component can confine the drawer body within the drawer box. The limiting component can release the limiting effect on the drawer body when the operating shaft rotates to the open position; the pushing mechanism includes an electric pushing component and a manual pushing component, both of which can drive the drawer body to slide along the slide rail when the operating shaft rotates to the open position, so that the drawer body slides relative to the drawer box; the operating mechanism includes an electric operating component and a manual operating component, both of which can drive the operating shaft to rotate between the open position and the closed position; the controller is electrically connected to the electric pushing component and the electric operating component.

[0006] In one embodiment, the bottom of the drawer body is provided with a roller, which rolls in cooperation with the slide rail. The electric propulsion assembly includes a first motor and a drive shaft. The drive shaft extends along the axial direction of the roller, and the output shaft of the first motor is connected to the roller through the drive shaft.

[0007] In one embodiment, an electric gear is mounted on the drive shaft, and the manual push assembly includes a rocker arm, a drive shaft, and a manual gear. One end of the drive shaft has a drive hole, one end of the rocker arm can be inserted into the drive hole, and the other end of the rocker arm extends outside the drawer body. The rocker arm can drive the drive shaft to rotate through the drive hole. The manual gear is mounted on the drive shaft and meshes with the electric gear.

[0008] In one embodiment, a first switch for controlling the on / off state is provided between the controller and the first motor. A through hole is provided on the drawer body corresponding to the position of the drive hole. A lever is movably connected to the drawer body. The lever is located at the through hole and connected to the first switch. The lever can rotate between the open position and the closed position to open and close the through hole and to close and open the first switch accordingly.

[0009] In one embodiment, the electric operating assembly includes a second motor and a coupling, wherein the output shaft of the second motor is connected to the operating shaft via the coupling.

[0010] In one embodiment, the bottom wall of the drawer box has a fixing hole. The limiting assembly includes a fixing plate, a crank, a limiting rod, and a guide rod. The fixing plate has a vertically extending guide groove. The crank includes a rotating part and a swinging part. The rotating part is mounted on the operating shaft. The swinging part is connected to the upper end of the limiting rod. The lower end of the limiting rod is located near the fixing hole. The guide rod is mounted in the middle of the limiting rod and slides with the guide groove. When the operating shaft rotates to the closed position, the crank can drive the limiting rod downward through the swinging part, so that the lower end of the limiting rod extends into the fixing hole, thereby limiting the drawer body to be located inside the drawer box.

[0011] In one embodiment, the rotating part has a rotating hole on one side along its axial direction, the manual operation component includes a knob and a transmission rod, the extension direction of the transmission rod is consistent with the axial direction of the rotating part, one end of the transmission rod is connected to the knob, and the other end of the transmission rod is inserted into the rotating hole.

[0012] In one embodiment, the circuit breaker is provided with a position sensor for detecting the rotational position of the operating shaft, and the position sensor is electrically connected to the controller.

[0013] In one embodiment, the drawer unit further includes a W5500 module and a 485 communication module, which are electrically connected to the controller. The drawer body is provided with a power supply that supplies power to the electric propulsion assembly, the electric operation assembly, the processor, the W5500 module, and the 485 communication module.

[0014] This utility model also proposes a low-voltage switch cabinet that uses the above-mentioned drawer unit.

[0015] This utility model proposes a drawer unit and a low-voltage switchgear. The drawer body can be pushed in and pulled out via either an electric drive mechanism controlled by a controller or a manual drive mechanism controlled by hand, offering multiple driving methods. Similarly, the circuit breaker's on / off operation can be controlled via either an electric or manual operation mechanism controlled by a controller. Operators can achieve automated control of the drawer body's sliding and the circuit breaker's on / off operation without being on-site, effectively improving the automation level of the drawer unit, saving time and effort. Simultaneously, operators can perform manual inspection and maintenance on-site, effectively avoiding problems caused by a single driving method malfunction leading to the drawer unit's inability to be pulled out or the circuit breaker's inability to disconnect, thus improving the safety of the drawer unit and consequently the low-voltage switchgear. The drawer unit, by incorporating a limit component, confines the drawer body within the drawer box when the circuit breaker's operating shaft is in the closed position, preventing current interruption or short circuit due to accidental sliding during electrical connection between the drawer unit and the low-voltage switchgear. This effectively prevents electrical faults, eliminates safety hazards, and ensures the safety of operators and equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the drawer body and part of the drawer box provided by this utility model; Figure 2 A schematic diagram of the structure of an embodiment of the drawer body provided by this utility model; Figure 3 This is a partial structural diagram of the drawer body provided by the present invention; Figure 4 A front view schematic diagram of the limiting component and driving mechanism of the drawer body provided by this utility model; Figure 5 A rear view structural diagram of the limiting component and driving mechanism of the drawer body provided by this utility model.

[0018] Explanation of icon numbers: 100. Drawer body; 10. Circuit breaker; 11. Operating shaft; 12. Limiting assembly; 121. Fixing plate; 122. Crank; 1221. Rotating part; 1222. Swinging part; 1223. Rotating hole; 123. Limiting rod; 124. Guide rod; 125. Fixing hole; 126. Guide groove; 20. Electric gear; 21. Drive shaft; 22. Manual gear; 23. Transmission shaft; 231. Drive hole; 30. Paddle; 31. Through hole; 40. Knob; 200. Drawer box; 210. Slide rail.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] This utility model proposes a drawer unit for a low-voltage switchgear. The low-voltage switchgear has a drawer box 200 inside, and a slide rail 210 extending along its extension direction is installed inside the drawer box 200. The drawer unit includes a drawer body 100 and a push mechanism, an operating mechanism, and a controller disposed on the drawer body 100. The drawer body 100 is disposed inside the drawer box 200 and electrically connected to the low-voltage switchgear. The drawer body 100 includes a circuit breaker 10, and the circuit breaker 10 is provided with an operating shaft 11 that can rotate between an open position and a closed position. The operating shaft 11 is connected to a limiting component 12, which can stop the drawer body when the operating shaft 11 rotates to the closed position. The body 100 is confined within the drawer box 200, and the limiting component 12 can release the limiting of the drawer body 100 when the operating shaft 11 is rotated to the open position; the pushing mechanism includes an electric pushing component and a manual pushing component, both of which can drive the drawer body 100 to slide along the slide rail 210 when the operating shaft 11 is rotated to the open position, so that the drawer body 100 slides relative to the drawer box 200; the operating mechanism includes an electric operating component and a manual operating component, both of which can drive the operating shaft 11 to rotate between the open and closed positions; the controller is electrically connected to the electric pushing component and the electric operating component.

[0024] Please see Figure 1 The drawer body 100 can slide within the drawer box 200 of the low-voltage switchgear. The slide rail 210 provides guidance for the sliding of the drawer body 100. The push mechanism, operating mechanism, and controller are all mounted on the drawer body 100 and can slide together with the drawer body 100. When the drawer body 100 is fully pushed into the drawer box 200 and the operating shaft 11 on the circuit breaker 10 rotates to the closed position, the circuit breaker 10 can connect the electrical connection between the drawer unit and the low-voltage switchgear. At this time, the limit component 12 limits the drawer body 100 within the drawer box 200, and the push mechanism cannot drive the drawer body 100 to slide. When the operating shaft 11 rotates to the open position, the circuit breaker 10 disconnects the electrical connection between the drawer unit and the low-voltage switchgear. At this time, the limit component 12 releases the limit on the drawer body 100, and the push mechanism can drive the drawer body 100 to slide relative to the drawer box 200 to pull out the drawer unit. The rotation of the operating shaft 11 can be driven by an electric operating component. The controller controls the electric operating component to drive the operating shaft 11 between the open and closed positions, enabling automated control of the circuit breaker 10's on / off state. The rotation of the operating shaft 11 can also be driven by a manual operating component, facilitating manual maintenance on-site. The sliding of the drawer unit can be driven by an electric push component. The controller controls the electric push component to push the drawer unit into or out of the drawer box 200, enabling automated control of the drawer unit's insertion and removal. The sliding of the drawer unit can also be driven by a manual push component, facilitating manual maintenance on-site.

[0025] The drawer unit of the low-voltage switchgear proposed in this utility model allows the drawer body 100 to be pushed in and pulled out via both an electric drive component controlled by a controller and a manual drive component controlled by hand, providing multiple driving methods. Similarly, the circuit breaker 10 can be switched on and off via both an electric operation component controlled by a controller and a manual operation component controlled by hand. Operators can achieve automated control of the drawer body 100 sliding and the circuit breaker 10 switching without being on-site, effectively improving the automation level of the drawer unit, saving time and effort. Simultaneously, operators can also perform manual inspection and maintenance on-site, effectively avoiding problems such as the drawer unit failing to be pulled out or the circuit breaker 10 failing to disconnect due to a fault in a single drive method, thus improving the safety of the drawer unit. The drawer unit is equipped with a limit component 12, which confines the drawer body 100 within the drawer box 200 when the operating shaft 11 of the circuit breaker 10 is in the closed position. This prevents current interruption or short circuit due to accidental sliding when the drawer unit is electrically connected to the low-voltage switchgear, effectively preventing electrical faults and ensuring the safety of operators and equipment.

[0026] It should be noted that the electrical connection between the drawer unit and the low-voltage switchgear adopts the conventional electrical connection method between the low-voltage switchgear and the drawer unit in the existing technology, and the control method of the controller for the electric operating component and the electric propulsion component also adopts the existing technology, which will not be described in detail here.

[0027] In one embodiment, the bottom of the drawer body 100 is provided with a roller, which rolls in cooperation with the slide rail 210. The electric propulsion assembly includes a first motor and a drive shaft 21. The drive shaft 21 extends along the axial direction of the roller, and the output shaft of the first motor is connected to the roller through the drive shaft 21.

[0028] Understandably, by providing rollers at the bottom of the drawer body 100, the rollers can roll along the slide rail 210, reducing frictional resistance when the drawer body 100 slides within the drawer box 200, thus improving the smoothness of the drawer body 100's sliding. The output shaft of the first motor is connected to the rollers via drive shafts 21. When there are multiple rollers, each roller is provided with a corresponding drive shaft 21. The output shaft of the first motor is connected to multiple drive shafts 21 via couplings, jointly driving the multiple rollers to roll. The first motor is electrically connected to a controller, which can control the rotation direction of the first motor to correspond to sliding into or out of the drawer body 100. The first motor and its interaction with the controller both employ existing technology and will not be described in detail here.

[0029] In one embodiment, an electric gear 20 is mounted on the drive shaft 21. The manual push assembly includes a rocker arm, a drive shaft 23, and a manual gear 22. One end of the drive shaft 23 has a drive hole 231. One end of the rocker arm can be inserted into the drive hole 231. The other end of the rocker arm extends outside the drawer body 100. The rocker arm can drive the drive shaft 23 to rotate through the drive hole 231. The manual gear 22 is mounted on the drive shaft 23 and meshes with the electric gear 20.

[0030] Please see Figure 4 An electric gear 20 is mounted on a drive shaft 21, and the rotation direction of the electric gear 20 is the same as the extension direction of the drive shaft 21. The electric gear 20 and the drive shaft 21 rotate synchronously. A manual gear 22 is mounted on a transmission shaft 23, and the rotation direction of the manual gear 22 is the same as the extension direction of the transmission shaft 23. The manual gear 22 and the transmission shaft 23 rotate synchronously. The electric gear 20 and the manual gear 22 mesh. When the first motor drives the drive shaft 21 to rotate, the drive shaft 21 drives the roller to rotate, and at the same time, the drive shaft 21 drives the manual gear 22 to rotate. At this time, the rocker arm does not need to be inserted into the drive hole 231, and the manual gear 22 rotates freely. When the rocker arm is inserted into the drive hole 231, the operator can drive the transmission shaft 23 to rotate by shaking the rocker arm. The transmission shaft 23 drives the manual gear 22 to rotate, and the manual gear 22 drives the electric gear 20 to rotate through meshing with the electric gear 20, thereby driving the roller to rotate through the drive shaft 21, realizing the manual drive of the roller. The manual gear 22 of the manual propulsion component can smoothly switch between and cooperate with the electric gear 20 of the electric propulsion component by meshing with it.

[0031] In one embodiment, a first switch for controlling the on / off state is provided between the controller and the first motor. A through hole 31 is provided on the drawer body 100 at the position corresponding to the drive hole 231. A lever 30 is movably connected to the drawer body 100. The lever 30 is located at the through hole 31 and is connected to the first switch. The lever 30 can rotate between the open position and the closed position to open and close the through hole 31 and to close and open the first switch accordingly.

[0032] Please see Figure 3A lever 30 is movably connected to the drawer body 100 via a hinge or other connection method. The lever 30 can rotate between an open position and a closed position. At the same time, the lever 30 is connected to a first switch. When the lever 30 is rotated to the open position, the through hole 31 is exposed, allowing the rocker arm to be inserted into the drive hole 231. At the same time, the lever 30 keeps the first switch in the closed state, thereby disconnecting the circuit between the controller and the first motor and preventing the electric propulsion assembly from working. When the lever 30 is rotated to the closed position, the through hole 31 is blocked by the lever 30, preventing the rocker arm from being inserted. At the same time, the lever 30 releases the first switch, keeping the first switch in the open state, thereby connecting the circuit between the controller and the first motor and allowing the electric propulsion assembly to work normally. The rotation of the lever 30 is synchronized with the opening or closing of the through hole 31 and the opening or closing of the first switch, ensuring that electric propulsion is automatically disabled in manual operation mode, avoiding potential conflicts or damage caused by simultaneous activation of electric and manual modes; the opening and closing of the through hole 31 is achieved through the physical blocking of the lever 30, improving operational safety and preventing accidental insertion; the on / off state of the first switch is directly controlled by the position of the lever 30, ensuring the reliability and immediacy of circuit control.

[0033] In one embodiment, the electric operating assembly includes a second motor and a coupling, wherein the output shaft of the second motor is connected to the operating shaft 11 via the coupling.

[0034] Please see Figure 5 An operating hole is provided at one end of the operating shaft 11. One end of the coupling is connected to the output shaft of the second motor, and the other end of the coupling is connected to the adapter extending into the operating hole. When the controller controls the output shaft of the second motor to rotate, the output shaft of the second motor transmits torque to the operating shaft 11 through the coupling and the adapter, driving the operating shaft 11 to rotate precisely between the open and closed positions, thereby controlling the on and off states of the circuit breaker 10 and realizing the automated control of the opening and closing of the circuit breaker 10.

[0035] In one embodiment, the bottom wall of the drawer box 200 is provided with a fixing hole 125. The limiting assembly 12 includes a fixing plate 121, a crank 122, a limiting rod 123, and a guide rod 124. The fixing plate 121 is provided with a vertically extending guide groove 126. The crank 122 includes a rotating part 1221 and a swinging part 1222. The rotating part 1221 is mounted on the operating shaft 11. The swinging part 1222 is connected to the upper end of the limiting rod 123. The lower end of the limiting rod 123 is located near the fixing hole 125. The guide rod 124 is mounted in the middle of the limiting rod 123 and slides with the guide groove 126. When the operating shaft 11 is rotated to the closed position, the crank 122 can drive the limiting rod 123 to move downward through the swinging part 1222, so that the lower end of the limiting rod 123 extends into the fixing hole 125, thereby limiting the drawer body 100 within the drawer box 200.

[0036] Please see Figure 4 The crank 122 consists of a rotating part 1221 and a swinging part 1222. The rotating part 1221 is fixedly installed on the operating shaft 11 of the circuit breaker 10 and rotates synchronously with the operating shaft 11. The swinging part 1222 is connected to the upper end of the limiting rod 123. The lower end of the limiting rod 123 is initially close to the fixing hole 125 but not inserted. The guide rod 124 is fixedly installed in the middle of the limiting rod 123 and slides with the guide groove 126 on the fixing plate 121 to ensure that the limiting rod 123 remains vertical during movement and prevents lateral displacement. When the operating shaft 11 rotates to the closed position under the drive of the electric or manual operating components, the rotating part 1221 of the crank 122 rotates with the operating shaft 11, causing the swing part 1222 to swing downwards, pushing the limit rod 123 to move downwards along the guide groove 126, so that the lower end of the limit rod 123 precisely extends into the fixing hole 125 on the bottom wall of the drawer box 200, thereby mechanically locking the drawer body 100 inside the drawer box 200 to prevent any accidental sliding; when the operating shaft 11 rotates to the open position, the swing part 1221 of the crank 122... 2. Swing upwards, pulling the limit rod 123 upwards along the guide groove 126, so that the lower end of the limit rod 123 exits from the fixing hole 125, releasing the limit on the drawer body 100, allowing the push mechanism to drive the drawer body 100 to slide, ensuring the reliability of the electrical connection between the drawer unit and the low-voltage switch cabinet when the circuit breaker 10 is closed, and preventing current interruption or short circuit caused by the drawer sliding; at the same time, the limit component 12 and the operating shaft 11 adopt a mechanical linkage method, which does not require a control signal, and is safer and more reliable than the control method through the controller.

[0037] In one embodiment, the rotating part 1221 has a rotating hole 1223 on one side along its axial direction. The manual operation component includes a knob 40 and a transmission rod. The extension direction of the transmission rod is consistent with the axial direction of the rotating part 1221. One end of the transmission rod is connected to the knob 40, and the other end of the transmission rod is inserted into the rotating hole 1223.

[0038] Please continue reading. Figure 4 A crank 122 is installed at the end of the operating shaft 11 opposite to the operating hole. A rotating hole 1223 is opened on the side of the crank 122 opposite to the operating shaft 11. The rotation of the crank 122 is controlled by the knob 40 through the insertion and cooperation of the transmission rod and the rotating hole 1223. When the operator rotates the knob 40, the knob 40 drives the transmission rod to rotate around its axis. Due to the insertion and cooperation of the transmission rod and the rotating hole 1223, the rotational torque of the transmission rod is directly transmitted to the rotating part 1221, driving the rotating part 1221 to rotate synchronously with the operating shaft 11, thereby controlling the switching of the operating shaft 11 of the circuit breaker 10 between the open and closed positions, realizing the manual drive of the circuit breaker 10 to open and close.

[0039] In one embodiment, the circuit breaker 10 is provided with a position sensor for detecting the rotational position of the operating shaft 11, and the position sensor is electrically connected to the controller.

[0040] Understandably, the position sensor is used to detect the rotational position of the operating shaft 11, and the position sensor can transmit the position information of the operating shaft 11 to the controller. When the operator manually drives the operating shaft 11 to rotate, the controller can obtain the position status of the operating shaft 11 in real time and prohibit the electric operating component from driving the operating shaft 11, so as to avoid mutual interference between the manual operating component and the electric operating component.

[0041] In one embodiment, the drawer unit further includes a W5500 module and a 485 communication module, which are electrically connected to the controller. The drawer body 100 is provided with a power supply that supplies power to the electric propulsion assembly, the electric operation assembly, the processor, the W5500 module, and the 485 communication module.

[0042] It should be noted that the controller can communicate with external terminals via the W5500 module and the 485 communication module, facilitating remote control of the drawer unit by operators. Operators can remotely control the pushing and pulling of the drawer unit and the opening and closing of circuit breaker 10 without being physically present, effectively improving the automation level of the drawer unit. The power supply continuously powers the electric propulsion assembly, electric operating assembly, processor, W5500 module, and 485 communication module, ensuring the continuous and reliable operation of the drawer unit. The W5500 module, 485 communication module, and power supply all utilize existing technology and will not be described in detail here.

[0043] This utility model also proposes a low-voltage switchgear, which utilizes the aforementioned drawer unit. The specific structure of the drawer unit is as described in the above embodiments. Since this low-voltage switchgear adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. By incorporating this drawer unit, the low-voltage switchgear can achieve a combination of automated and manual control for pushing in and pulling out each drawer unit, and a combination of automated and manual control for opening and closing each circuit breaker 10. This effectively avoids the problem of drawer units failing to be pulled out or circuit breakers 10 failing to disconnect due to a single drive mode failure, thereby improving the safety of the low-voltage switchgear.

[0044] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A drawer unit of a low voltage switchgear, characterized in that, The low-voltage switch cabinet is provided with a drawer box, and the drawer box is equipped with a slide rail arranged along its extension direction. The drawer unit includes a drawer body and a push mechanism, an operating mechanism and a controller arranged on the drawer body. The drawer body is disposed inside the drawer box and is electrically connected to the low-voltage switch cabinet. The drawer body includes a circuit breaker. The circuit breaker is provided with an operating shaft that can rotate between an open position and a closed position. The operating shaft is connected to a limiting component. The limiting component can limit the drawer body inside the drawer box when the operating shaft rotates to the closed position, and the limiting component can release the limiting of the drawer body when the operating shaft rotates to the open position. The propulsion mechanism includes an electric propulsion component and a manual propulsion component. Both the electric propulsion component and the manual propulsion component can drive the drawer body to slide along the slide rail when the operating shaft is rotated to the open position, so that the drawer body slides relative to the drawer box. The operating mechanism includes an electric operating component and a manual operating component, both of which can drive the operating shaft to rotate between the open position and the closed position; The controller is electrically connected to the electric propulsion assembly and the electric operation assembly.

2. The drawer unit of the low voltage switchgear cabinet according to claim 1, characterized in that, The bottom of the drawer body is provided with rollers, which roll in cooperation with the slide rail. The electric propulsion assembly includes a first motor and a drive shaft. The drive shaft extends along the axial direction of the rollers, and the output shaft of the first motor is connected to the rollers through the drive shaft.

3. The drawer unit of the low voltage switchgear cabinet according to claim 2, characterized in that, An electric gear is mounted on the drive shaft. The manual push assembly includes a rocker arm, a drive shaft, and a manual gear. One end of the drive shaft has a drive hole. One end of the rocker arm can be inserted into the drive hole. The other end of the rocker arm extends outside the drawer body. The rocker arm can drive the drive shaft to rotate through the drive hole. The manual gear is mounted on the drive shaft and meshes with the electric gear.

4. The drawer unit of the low voltage switchgear according to claim 3, characterized in that, A first switch for controlling the on / off state is provided between the controller and the first motor. A through hole is provided on the drawer body corresponding to the position of the drive hole. A lever is movably connected to the drawer body. The lever is located at the through hole and is connected to the first switch. The lever can rotate between the open position and the closed position to open and close the through hole and to close and open the first switch accordingly.

5. The drawer unit of the low voltage switchgear according to claim 1, characterized in that, The electric operating assembly includes a second motor and a coupling, wherein the output shaft of the second motor is connected to the operating shaft via the coupling.

6. The drawer unit of a low voltage switchgear according to any of claims 1 to 5, characterized in that, The bottom wall of the drawer box has a fixing hole. The limiting assembly includes a fixing plate, a crank, a limiting rod, and a guide rod. The fixing plate has a vertically extending guide groove. The crank includes a rotating part and a swinging part. The rotating part is mounted on the operating shaft, and the swinging part is connected to the upper end of the limiting rod. The lower end of the limiting rod is located near the fixing hole. The guide rod is mounted in the middle of the limiting rod and slides with the guide groove. When the operating shaft rotates to the closed position, the crank can drive the limiting rod downward through the swinging part, so that the lower end of the limiting rod extends into the fixing hole, thereby limiting the drawer body to be located inside the drawer box.

7. The drawer unit of the low voltage switchgear cabinet according to claim 6, characterized in that, The rotating part has a rotating hole on one side along its axial direction. The manual operation component includes a knob and a transmission rod. The extension direction of the transmission rod is consistent with the axial direction of the rotating part. One end of the transmission rod is connected to the knob, and the other end of the transmission rod is inserted into the rotating hole.

8. The drawer unit of a low voltage switchgear according to any of claims 1 to 5, characterized in that, The circuit breaker is equipped with a position sensor for detecting the rotational position of the operating shaft, and the position sensor is electrically connected to the controller.

9. The drawer unit of a low voltage switchgear according to any of claims 1 to 5, characterized in that, The drawer unit also includes a W5500 module and a 485 communication module, which are electrically connected to the controller. The drawer body is provided with a power supply that supplies power to the electric push assembly, the electric operation assembly, the controller, the W5500 module, and the 485 communication module.

10. A low voltage switchgear, characterized in that The application has a drawer unit as described in any one of claims 1 to 9.

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