Neutral line overlapping switching mechanism and dual power automatic transfer switch

Abstract

The application provides a neutral line overlapping switching mechanism which comprises a common rotating shaft, a standby rotating shaft and an interlocking mechanism, the common rotating shaft is connected with the standby rotating shaft through the interlocking mechanism, the interlocking mechanism comprises a first limiting piece, a second limiting piece, a first adjusting mechanism, a second adjusting mechanism and a fixing base, the first limiting piece and the second limiting piece are symmetrically installed on the fixing base, characterized in that the first adjusting mechanism comprises a first locking bolt, a first swing arm, a first upper rotating shaft, a first lower rotating shaft and a first short connecting rod, one end of the first swing arm is connected with one end of the first short connecting rod through the first limiting piece, the other end of the first swing arm is connected with the other end of the first short connecting rod through the first upper rotating shaft, the position of the other end of the first swing arm on the limiting piece is adjustable, the first locking bolt is connected with the first lower rotating shaft through the first upper rotating shaft, and the second adjusting mechanism has the same structure as the first adjusting mechanism.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a neutral line overlap switching mechanism for a dual-power automatic transfer switch and a dual-power automatic transfer switch using the same. Background Technology

[0002] With technological advancements, people now demand higher performance from technical specifications and place greater emphasis on the safety, reliability, and continuity of power supply. Power failures in data centers can lead to massive data loss. Therefore, dual power transfer switches combined with uninterruptible power supplies (UPS) are used to ensure power continuity. However, during the switching process, regardless of whether it's a two-position or three-position structure (i.e., a two-position structure with both primary and backup power supplies on, or a three-position structure with both power supplies off), a short-term floating of the load neutral line is possible. Like other phase lines, the neutral line experiences a temporary disconnection, potentially causing server restarts and resulting in serious consequences such as data loss or server damage.

[0003] For a technical solution where both the primary and backup power supplies are connected, the neutral lines may overlap for a considerable period during the switching process. Excessive overlap can cause malfunctions in the upstream leakage current sensor and result in stray current that negatively impacts the system. Furthermore, manufacturing and / or assembly errors in the operating mechanism, or significant impacts during use, can deform the connecting rods or certain components, affecting the accuracy of the operating mechanism's operation and even leading to incomplete closing. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to propose a neutral line overlap switching mechanism with an adjustment mechanism. This mechanism can adjust and compensate for errors generated during the manufacturing, assembly, and use of the operating mechanism, achieving precise switching from the primary or backup power supply to the backup or primary power supply. During this process, there is a brief neutral line closure overlap time, and the mechanism reliably and quickly disconnects the primary or backup power supply at the end of the switch.

[0005] To achieve the above objectives, this invention proposes a neutral line overlap switching mechanism comprising a common shaft, a spare shaft, and an interlocking mechanism. The common shaft is connected to the spare shaft via the interlocking mechanism. The common shaft is connected to the common N-phase contact via a first spring, and the spare shaft is connected to the spare N-phase contact via a second spring. The interlocking mechanism comprises a first limiting member, a second limiting member, a first adjusting mechanism, a second adjusting mechanism, and a fixed base. The first limiting member and the second limiting member are symmetrically mounted on the fixed base. The first adjusting mechanism is connected to the common shaft via a first connecting rod, and the second adjusting mechanism is connected to the spare shaft via a second connecting rod. The first adjusting mechanism comprises a first locking bolt, a first swing arm, a first upper shaft, a first lower shaft, and a first short connecting rod. One end of the first swing arm passes through the first limiting member and connects to one end of the first short connecting rod. The other end of the first swing arm is connected to the other end of the first short connecting rod via the first upper shaft. The position of the other end of the first swing arm on the limiting member is adjustable. The first locking bolt passes through the first upper shaft and connects to the first lower shaft. The second adjusting mechanism has the same structure as the first adjusting mechanism.

[0006] Furthermore, a first guide groove is provided on the first limiting member, and during adjustment, one end of the first upper rotating shaft can move up and down along the first guide groove.

[0007] Furthermore, the first upper rotating shaft is provided with a first upper threaded hole, and the first lower rotating shaft is provided with a first lower threaded hole. The first locking bolt passes through both the first upper threaded hole and the first lower threaded hole to fix the position of the first adjusting mechanism on the first limiting member.

[0008] Furthermore, the first limiting member also includes a first mating part and a first connecting part. The first mating part is provided with a first short arc surface and a first long arc surface, and the first connecting part is provided with a first upper connecting hole and a first lower connecting hole. The second limiting member includes a second mating part and a second connecting part. The second mating part is provided with a second short arc surface and a second long arc surface, and the second connecting part is provided with a second upper connecting hole and a second lower connecting hole. The first mating part and the second mating part are in contact and mating. The first connecting part is connected to the second connecting part by a spring. The first limiting member is rotatably connected to one end of the fixed base by the first lower rotating shaft, and the second limiting member is rotatably connected to the other end of the fixed base by the second lower rotating shaft.

[0009] Furthermore, the first limiting member and the second limiting member have the same structure.

[0010] Furthermore, a common closing cantilever is rotatably mounted on the common rotating shaft. One end of the common closing cantilever rests against the first shoulder of the common rotating shaft, and the other end of the common closing cantilever is restricted to axial movement along the rotation axis of the common rotating shaft by a first driving member on the common rotating shaft.

[0011] Furthermore, the first driving member is provided with a first concave point and a first driving shaft. The first concave point on the first driving member contacts and engages with a first protrusion provided on the commonly used closing cantilever. The first driving shaft on the first driving member contacts and engages with a first groove on the commonly used closing cantilever.

[0012] Furthermore, the commonly used closing cantilever includes a first upper hole and a first lower hole. The first upper hole of the commonly used closing cantilever is connected to one end of the interlocking mechanism through a first connecting rod, and the first lower hole of the commonly used closing cantilever is connected to the commonly used N-phase contact.

[0013] Furthermore, the commonly used closing cantilever and the spare closing cantilever have the same structure, the commonly used rotating shaft and the spare rotating shaft have the same structure, and the commonly used rotating shaft and the spare rotating shaft are mirror images mounted on the base.

[0014] Another objective of this invention is to provide a dual-power automatic transfer switch comprising a base, a normal operating mechanism, a standby operating mechanism, and a neutral line overlap switching mechanism, wherein the normal operating mechanism, the standby operating mechanism, and the neutral line overlap switching mechanism are all mounted on the base, characterized in that the neutral line overlap switching mechanism is the aforementioned neutral line overlap switching mechanism.

[0015] Compared with the prior art, the neutral line overlap mechanism of the present invention has the following technical effects:

[0016] 1. The neutral line overlap switching mechanism of the present invention has an interlocking function, and its structure has a long mechanical life and high stability; 2. The neutral line overlap switching mechanism of the present invention can change the position of the first or second limiting member by adjusting the first or second swing arm on the first or second limiting member, thereby compensating for manufacturing or assembly errors. Moreover, the adjustment has high dimensional accuracy and can achieve stepless adjustment within the size range. 3. The present invention can adjust the neutral line overlap time by adjusting the length of the mating arc surface of the first mating part and the second mating part on the first limiting member and the second limiting member. The overlap time accuracy is high and can be stabilized at 2~4ms. It can effectively avoid the long neutral line overlap time during the switching process of the dual power supply automatic transfer switch, which may cause the upper leakage current sensor to malfunction. 4. The adjustment mechanism in the neutral line overlap mechanism of the present invention is fixed by double thread, which can effectively avoid the phenomenon of uncoupling and loosening due to impact or vibration during operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a dual-power automatic transfer switch with the outer casing removed in a specific embodiment of the present invention; Figure 2 The schematic diagram of the commonly used operating mechanism of the dual-power automatic transfer switch in a specific embodiment of the present invention is shown in the closed state. Figure 3 for Figure 1 A structural diagram of a commonly used rotating shaft, numbered 2A in the middle; Figure 4 for Figure 2 A schematic diagram of a commonly used closing cantilever structure with serial number 21A in the middle section; Figure 5 This is a schematic diagram of the neutral line overlap switching mechanism in a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the connection relationship of the neutral line overlap switching mechanism in a specific embodiment of the present invention; Figure 7 for Figure 5 A structural schematic diagram of the limiting component numbered 42A in the middle section; Figure 8 for Figure 5 A schematic diagram of the upper rotating shaft with serial number 47A in the middle; Figure 9 for Figure 5 A schematic diagram of the lower rotating shaft, numbered 46A in the middle; Figure 10 for Figure 5 A schematic diagram of the swing arm with serial number 45A in the middle; Figure 11 for Figure 5 A structural schematic diagram of the short connecting rod numbered 48A in the middle; Figure 12 for Figure 5 A schematic diagram of the structure of the adjusting bolt numbered 44A in the middle; Figure 13 This is a schematic diagram illustrating the principle of a neutral line overlap mechanism in a specific embodiment of the present invention; Figure 14 This is a schematic diagram illustrating the adjustment principle of the size adjustment mechanism in the neutral line overlap mechanism of the present invention; Figure 15 This is a schematic diagram of the adjustment of the size of the limiting member in the neutral line overlap mechanism of the present invention; Figure 16 This is a schematic diagram of a failure mode of the neutral line overlap mechanism in a specific embodiment of the present invention; Figure 17 This is a schematic diagram of adjusting the size of the limiting member in the neutral line overlap mechanism of the present invention; Figure 18 This is a schematic diagram illustrating another failure mode of the neutral line overlap mechanism in a specific embodiment of the present invention; Figure 19 This is a schematic diagram of adjusting the size of the limiting member in the neutral line overlap mechanism of the present invention; Explanation of serial number 1-Base, 2A-Common rotating shaft, 21A-Common closing cantilever, 20-Drive component, 201-First recess, 202-First drive shaft, 21-Phase A contact connector, 22-Phase B contact connector, 23-Phase C contact connector, 24-Shoulder, 201A-First protrusion, 212A-First groove, 213A-First hole, 2B-Spare rotating shaft, 21B-Spare closing cantilever, 211B-First... Two protrusions, 212B - second groove, 213B - second upper hole, 214B - second lower hole, 3A - common mechanism, 3B - spare mechanism, 4 - interlocking mechanism, 41A - first connecting rod, 42A - first limiting member, 421A - first short arc surface, 422A - first long arc surface, 423A - first guide groove, 424A - first upper connecting hole, 425A - first lower connecting hole, 426A - first mounting... Hole, 41B - Second connecting rod, 42B - Second limiting member, 421B - Second short arc surface, 422B - Second long arc surface, 423B - Second guide groove, 424B - Second upper connecting hole, 425B - Second lower connecting hole, 426B - Second mounting hole, 43 - Fixed seat, 44A - First locking bolt, 44B - Second locking bolt, 45A - First swing arm, 451A - First rotating shaft, 452A - First hole, 45B - Second swing arm, 451B - Second rotating shaft, 452B - Second hole, 46A - First lower rotating shaft, 461A - First lower threaded hole, 46B - Second lower rotating shaft, 461B - Second lower threaded hole, 47A - First upper rotating shaft, 471A - First upper threaded hole, 47B - Second upper rotating shaft, 471B - First upper threaded hole, 48A - First short connecting rod, 48B - Second short connecting rod. Detailed Implementation

[0018] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0019] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0022] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0023] like Figure 1-2As shown in a specific embodiment of the present invention, the dual-power automatic transfer switch includes a base 1, a normal operating mechanism 3A, a standby operating mechanism 3B, and an interlocking mechanism 4. The normal operating mechanism 3A and the standby operating mechanism 3B are mounted on the base 1. The normal operating mechanism 3A is provided with a normal rotating shaft 2A, a normal N-phase contact 51A, and normal A, B, and C three-phase contacts 52A. The standby operating mechanism 3B is provided with a standby rotating shaft 2B, a standby N-phase contact 51B, and a standby A, B, and C three-phase contact 52B. The normal rotating shaft 2A and the standby rotating shaft 2B are mirror images of each other. The normal rotating shaft 2A is connected to the standby rotating shaft 2B via the interlocking mechanism 4. Simultaneously, the normal rotating shaft 2A is connected to the normal N-phase contact 51A via a first spring 6A, and the standby rotating shaft 2B is connected to the standby N-phase contact 51B via a second spring 6B. In this invention, both the first spring 6A and the second spring 6B are tension springs. When the dual-power automatic transfer switch switches from the neutral position to the standby power supply closing position (at which time the N-phase of the primary power supply is in the closed state), the primary operating mechanism 3A drives the primary operating shaft 2A to rotate when it closes. The primary operating shaft 2A drives the A, B, and C phase contacts 52A and the primary N-phase contact 51A of the primary power supply to close. At the same time, the primary operating shaft 2A pushes the standby shaft 2B to rotate through the interlocking mechanism 4. After ensuring a brief overlap between the primary N-phase contact 51A and the standby N-phase contact 51B, the A, B, and C phase contacts 52B and the standby N-phase moving contact 51B of the standby power supply open. The neutral line overlap switching mechanism of this invention has an interlocking function, which can realize a brief overlap between the primary N-phase contact and the standby N-phase contact during the switching process from the primary power supply to the standby power supply or from the standby power supply to the primary power supply, effectively avoiding damage to the load caused by the N-phase being suspended during the switching process.

[0024] like Figure 2-4As shown, in a specific embodiment of the present invention, a common closing cantilever 21A, an A-phase contact connector 21, a B-phase contact connector 22, and a C-phase contact connector 23 are mounted on a common rotating shaft 2A. The A-phase contact connector 21, B-phase contact connector 22, and C-phase contact connector 23 are fixedly mounted on the common rotating shaft 2A, while the common closing cantilever 21A is rotatably mounted on the common rotating shaft 2A. One end of the common closing cantilever 21A abuts against the first phase of the common rotating shaft 2A. On a shoulder 24, the other end of the commonly used closing cantilever 21A is restricted from axial movement along the rotation axis of the commonly used rotating shaft 2A by a first driving member 20. The first driving member 20 has a first recess 201 and a first driving shaft 202. The first recess 201 on the first driving member 20 contacts and engages with the first protrusion 211A of the commonly used closing cantilever 21A, and the first driving shaft 202 on the first driving member 20 contacts and engages with the first groove 212A of the commonly used closing cantilever 21A. When the commonly used rotating shaft 2A rotates, the first driving member 20 rotates in the same direction as the commonly used rotating shaft 2A, and the commonly used closing cantilever 21A also rotates in the same direction under the drive of the first driving member 20.

[0025] Similarly, the standby rotating shaft 2B is equipped with a standby closing cantilever 21B and A, B, and C phase contact connectors. The A, B, and C phase contact connectors are fixedly installed on the standby rotating shaft 2B, while the standby closing cantilever 21B is rotatably installed on the standby rotating shaft 2B. One end of the standby closing cantilever 21B abuts against the second shoulder of the standby rotating shaft 2B, and the other end of the standby closing cantilever 21B is restricted to axial movement along the rotation axis of the standby rotating shaft 2B by a second driving member. The second driving member is provided with a second recess and a second driving shaft. The second recess on the second driving member contacts and engages with the second protrusion 211B of the standby closing cantilever 21B, and the second driving shaft on the second driving member contacts and engages with the second groove 212B of the standby closing cantilever 21B. When the standby shaft 2B rotates, the second drive unit rotates in the same direction as the standby shaft 2B, and the standby closing arm 21B also rotates in the same direction under the drive of the second drive unit; the common shaft 2A and the standby shaft 2B in this invention have the same structure.

[0026] like Figure 3-4As shown, in a specific embodiment of the present invention, the commonly used closing cantilever 21A includes a first protrusion 211A, a first groove 212A, a first upper hole 213A, and a first lower hole 214A. One end of the commonly used closing cantilever 21A is connected to one end of the first connecting rod 41A of the interlocking mechanism 4 through the first upper hole 213A. The other end of the first connecting rod 41A is connected to the first limiting member 42A. The lower end of the commonly used closing cantilever 21A is connected to the commonly used N-phase contact 51A through the first lower hole 21A4. At the same time, the commonly used rotating shaft 2A is connected to the commonly used N-phase contact 51A through the first spring 6A. Similarly, a spare closing cantilever 21B is mounted on the spare rotating shaft 2B. The spare closing cantilever 21B can rotate around the spare rotating shaft 2B. The spare closing cantilever 21B includes a second protrusion 211B, a second groove 212B, a second upper hole 213B, and a second lower hole 214B. One end of the spare closing cantilever 21B is connected to one end of the second connecting rod 41B through the second upper hole 213B, and the other end of the second connecting rod 41B is connected to the second limiting member 42B. The lower end of the spare closing cantilever 21B is connected to the spare N-phase contact 51B through the second lower hole 214B. At the same time, the spare rotating shaft 2B is connected to the spare N-phase contact 51B through the second spring 6B. The commonly used closing cantilever 21A and the spare closing cantilever 21B in this invention have the same structure.

[0027] like Figure 5-7 As shown, in a specific embodiment of the present invention, the interlocking mechanism 4 includes a first limiting member 42A, a second limiting member 42B, and a fixed base 43. The first limiting member 42A and the second limiting member 42B are mirror images mounted on the fixed base 43. The lower end of the first limiting member 42A is rotatably mounted on one end of the fixed base 43, and the lower end of the second limiting member 42B is rotatably mounted on the other end of the fixed base 43. The upper end of the first limiting member 42A and the upper end of the second limiting member 42B are connected by a spring 44, which is a tension spring in the present invention.

[0028] like Figure 7As shown, in a specific embodiment of the present invention, the first limiting member 42A includes a first mating part, a first connecting part, and a first adjusting mechanism. The first mating part is provided with a first short arc surface 421A and a first long arc surface 422A. The first connecting part is provided with a first upper connecting hole 424A, a first lower connecting hole 425A, and a first mounting hole 426A. A first guide groove 423A is also provided in the middle of the first limiting member 42A. The first adjusting mechanism is rotatably mounted on the first limiting member 42A. The first limiting member 42A in the present invention... 2A and the second limiting member 42B have the same structure. The second limiting member 42B includes a second mating part, a second connecting part, and a second adjusting mechanism. The second mating part is provided with a second short arc surface 421B and a second long arc surface 422B. The second connecting part is provided with a second upper connecting hole 424B, a second lower connecting hole 425B, and a second mounting hole 426B. A second guide groove 423B is also provided in the middle of the second limiting member 42B. The second adjusting mechanism is rotatably mounted on the second guide groove 423B on the first limiting member 42A.

[0029] like Figure 5-6 As shown, in a specific embodiment of the present invention, the first adjusting mechanism includes a first locking bolt 44A, a first swing arm 45A, a first upper rotating shaft 47A, a first lower rotating shaft 46A, and a first short connecting rod 48A; as Figure 8 As shown, the first upper rotating shaft 47A in this invention has round shafts at both ends, and a first upper threaded hole 471A is provided in the middle of the first upper rotating shaft 47A. Figure 9 As shown, one end of the first lower rotating shaft 46A in this invention is a round shaft, and the other end of the first lower rotating shaft 46A is provided with a first lower threaded hole 461A. For example... Figure 10 As shown, in this invention, one end of the first swing arm 45A is provided with a first rotating shaft 451A, and the other end of the first swing arm 45A is provided with a first hole 452A. Figure 10As shown, the first short connecting rod 48A in this invention has a sheet-like symmetrical structure, and a mounting hole is provided at each end of the first short connecting rod 48A. During installation, first, the first locking bolt 44A is installed in the first upper threaded hole 471A on the first upper rotating shaft 47A. Then, one end of the first upper rotating shaft 47A is connected to the first swing arm 45A, and the other end of the first upper rotating shaft 47A passes through the first guide groove 423A and is connected to one end of the first short connecting rod 48A. The other end of the first swing arm 45A passes through the first mounting hole 426A and is connected to the other end of the first short connecting rod 48A. At this time, the first rotating shaft 451A at one end of the first swing arm 45A can rotate around the rotation axis of the first mounting hole 423A, and the first upper rotating shaft 47A at the other end of the first swing arm 45A slides in the first guide groove 423A. After the position of the first upper rotating shaft 47A at the other end of the first swing arm 45A in the first guide groove 423A is determined, the position of the first swing arm 45A in the first limiting member 42A is determined by screwing the first locking bolt 44A into the first lower threaded hole 461A of the first lower rotating shaft 46A. The first adjustment mechanism in this invention is fixed by double threads, which can effectively prevent the loosening and uncoupling caused by impact or vibration during operation.

[0030] In this invention, the second adjusting mechanism has the same structure as the first adjusting mechanism. Similarly, the second adjusting mechanism includes a second locking bolt 44B, a second swing arm 45B, a second upper rotating shaft 47B, a second lower rotating shaft 46B, and a second short connecting rod 48B; as shown... Figure 8 As shown, the two ends of the second upper rotating shaft 47B in this invention are round shafts, and a second upper threaded hole 471B is provided in the middle of the second upper rotating shaft 47B. Figure 9 As shown, one end of the second lower rotating shaft 46B in this invention is a round shaft, and the other end of the second lower rotating shaft 46B is provided with a second lower threaded hole 461B. Figure 10 As shown, in this invention, one end of the second swing arm 45B is provided with a second rotating shaft 451B, and the other end of the second swing arm 45B is provided with a second hole 452B. For example... Figure 10As shown, the second short connecting rod 48B in this invention has a sheet-like symmetrical structure, and a mounting hole is provided at each end of the second short connecting rod 48B. During installation, first install the second locking bolt 44B into the second upper threaded hole 471B on the second upper rotating shaft 47B. Then, connect one end of the second upper rotating shaft 47B to the second swing arm 45B, and connect the other end of the second upper rotating shaft 47B through the second guide groove 423B to one end of the second short connecting rod 48B. Connect the other end of the second swing arm 45B through the second mounting hole 426B to the other end of the second short connecting rod 48B. At this time, the second rotating shaft 451B at one end of the second swing arm 45B can rotate around the rotation axis of the second mounting hole 423B, and the second upper rotating shaft 47B at the other end of the second swing arm 45B slides in the second guide groove 423B. After the position of the second upper rotating shaft 47B at the other end of the second swing arm 45B in the second guide groove 423B is determined, the position of the second swing arm 45B in the second limiting member 42B is determined by screwing the second locking bolt 44B into the second lower threaded hole 461B of the second lower rotating shaft 46B.

[0031] like Figure 12-13 As shown, the distance between the rotation axis of the first upper rotating shaft 47A and the rotation axis of the first lower rotating shaft 46A is L3, the distance between the rotation axes of the two ends of the first swing arm 45A is L3′, and the distance between the first lower connecting hole 425A and the first mounting hole 426A on the first limiting member 42A is L3″. L3, L3′ and L3″ form a triangular mechanism. When the first locking bolt 44A is screwed into the first upper threaded hole 471A of the first upper rotating shaft 47A and the first lower threaded hole 461A of the first lower rotating shaft 46A in sequence, it can lock the dimension L3 to remain unchanged. When the first locking bolt 44A is screwed out of the first lower rotating shaft 46A, the dimension L3 can be adjusted. After adjustment, it can be screwed in again to lock. When dimensions L3, L3′, and L3″ form a stable triangular mechanism on the first limiting member 42A, dimension L3 is in a locked state. After the first upper rotating shaft 47A is pushed by the first connecting rod 41A, it will drive the first limiting member 42A to rotate through the triangular mechanism.

[0032] like Figure 15 As shown, the theoretical design value of the distance between the center of the first upper rotating shaft 47A and the center of the first lower rotating shaft 46A on the first limiting member 42A in this invention is L3, and the rotation angle of the first limiting member 42A when the circuit is closed is α.

[0033] Errors during manufacturing or assembly can cause the operating mechanism to fail to close properly. This manifests as insufficient rotation angle α of the first limiting member 42A; that is, even though the normally used N-phase contact 51A is closed, the second limiting member 42B on the backup power supply side is locked by the first limiting member 42A on the normally used power supply side and cannot rotate, preventing the backup N-phase contact 51B from opening. Figure 16As shown. At this time, the rotation angle α of the first limiting member 42A can be increased by reducing the size of L3; the specific operation is as follows: with one side's N-pole contact closed and the other side's N-pole contact in the open state, unscrew the first locking bolt 44A from the first lower rotating shaft 46A, and rotate the first swing arm 45A clockwise to reduce L3 and increase the rotation angle α, as shown. Figure 17 As shown, the first limiting member 42A and the second limiting member 42B are in surface contact without gap. At this time, the first locking bolt 44A is screwed into the first lower threaded hole 461A of the first lower rotating shaft 46A to complete the size adjustment. The neutral line overlap switching mechanism of the present invention can achieve stepless adjustment of any size and precision within the size range. During the switching process of the main and backup power supply, the first locking bolt 44A is locked with double nuts. Even under the conditions of impact and vibration, there is no need to add a bolt anti-loosening mechanism. The relative distance L3 between the first upper rotating shaft 47A and the first lower rotating shaft 46A can remain unchanged, effectively avoiding the phenomenon of uncoupling and loosening due to impact or vibration during the operation.

[0034] If the first limiting component 42A on the power supply side rotates too much by an angle α during the switching process, a gap failure will occur between the first limiting component 42A and the second limiting component 42B. Figure 18 As shown, although all actions can be completed, excessive clearance will cause excessive overtravel of the commonly used N-phase contact 51A. When the commonly used A, B, and C three-phase contacts 52A are opened, the commonly used N-phase contact 51A will exhibit a springback phenomenon. At this time, the rotation angle α of the first limiting member 42A can be reduced by increasing the size of L3. Figure 19 As shown, the first locking bolt 44A is unscrewed from the first lower rotating shaft 46A, and the first swing arm 45A is rotated counterclockwise to increase L3, thereby reducing the rotation angle α of the first limiting member 42A, until the first limiting member 42A and the second limiting member 42B are in surface contact without gap. At this time, the first locking bolt 44A is screwed into the first lower threaded hole 461A of the first lower rotating shaft 46A to complete the size adjustment. At this time, the rotation angle α of the first limiting member 42A is reduced while the dimensions of other components remain unchanged.

[0035] Similarly, the adjustment methods and principles after the backup power supply fails are the same as those for the main power supply.

[0036] The working principle of the dual-power automatic transfer switch neutral line overlap switching mechanism of the present invention is as follows: An automatic transfer switch is a device that automatically and reliably switches between a primary power supply and a backup power supply. Under normal conditions, the load is powered by the primary power supply. When the primary power supply suddenly fails or loses power, the automatic transfer switch automatically switches to the backup power supply, allowing the equipment to continue operating normally. In the automatic transfer switch, the contacts of phases A, B, C, and N of the primary operating mechanism are in the closed state, while the contacts of phases A, B, C, and N of the backup operating mechanism are in the open state. Figure 2 As shown, at this time, the first limiting member 42A in the interlocking mechanism 4 is constrained by the second limiting member 42B and cannot rotate counterclockwise, but can only rotate clockwise. The N-phase contact 51A is usually kept in the closed state.

[0037] When the main power supply suddenly fails or is interrupted, the main operating mechanism 3A drives the main operating shaft 2A to rotate counterclockwise, causing the main A, B, and C phase contacts 52A to open. At this time, the main A, B, and C phase contacts 52A of the main operating mechanism 3A are in the open state, and the main N phase contact 51A is in the closed state. The A, B, and C phase contacts 52B and the standby N phase contact 51B of the standby operating mechanism 3B are all in the open state. The standby operating mechanism 3B drives the standby shaft 2B to rotate counterclockwise, causing the standby A, B, and C phase contacts 52B to close. At the same time, the standby shaft 2B pushes the second protrusion 211B and the second groove 212B on the standby closing cantilever 21B to rotate counterclockwise through the driving component. The lower end of the standby closing cantilever 21B drives the standby N phase contact 51B to close, and the upper end of the standby closing cantilever 21B... The second link 41B pulls the second limiting member 42B to move counterclockwise to the left. When the second short arc surface 421B of the second limiting member 42B contacts the first short arc surface 421A of the first limiting member 42A, the spare N-phase contact 51B is just closed, and the commonly used N-phase contact 51A has not yet opened (i.e., the neutral lines are overlapping). At this time, the first limiting member 42A has a tendency to rotate counterclockwise under the action of the spring 44 and the first spring 6A. When the spare closing arm 21B continues to rotate counterclockwise until the spare N-phase contact 51B is closed, the first limiting member 42A is released from the constraint of the second limiting member 42B and rotates counterclockwise under the action of the spring 44. It also pushes the commonly used closing arm 21A to rotate counterclockwise through the first link 41A. The commonly used N-phase contact 51A is lifted under the action of the first spring 6A and the commonly used closing arm 21A, and the commonly used N-phase contact 51A is opened.

[0038] When the main power supply returns to normal, when the dual power automatic transfer switch switches from the middle position (where the backup power supply N phase is closed) to the main power supply closing position, the main power supply mechanism 3A drives the main power supply shaft 2A to rotate clockwise when closing. The main power supply shaft 2A drives the main power supply A, B, and C phase contacts 52A to close. At the same time, the main power supply shaft 2A pushes the first protrusion 211A and the first groove 212A on the main power supply closing arm 21A to rotate clockwise. The lower end of the main power supply closing arm 21A drives the main power supply N phase contact 51A to close. The upper end of the main power supply closing arm 21A pushes the first limiting member 42A to rotate clockwise through the first connecting rod 41A. The second limiting member 42B rotates counterclockwise under the push of the first limiting member 42A. When the first short arc surface 421A contacts the second short arc surface 421B of the second limiting member 42B, the normally used N-phase contact 51A is just closed, and the standby N-phase contact 51B has not yet opened (i.e., the neutral lines are overlapping). At this time, the second limiting member 42B has a tendency to rotate clockwise under the action of the spring 44 and the second spring 6B. When the normally used closing arm 21A continues to rotate clockwise until the normally used N-phase contact 51A is closed, the second limiting member 42B is released from the constraint of the first limiting member 42A and rotates clockwise under the action of the spring 44 and the second spring 6B. It also pushes the standby closing arm 21B to rotate clockwise through the second connecting rod 41B. The standby N-phase contact 51B is lifted under the action of the second spring 6B and the standby closing arm 21B, and the standby N-phase contact 51B is opened.

[0039] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A neutral line overlap switching mechanism, comprising a primary rotating shaft, a secondary rotating shaft, and an interlocking mechanism, wherein the primary rotating shaft is connected to the secondary rotating shaft via the interlocking mechanism, the primary rotating shaft is connected to a primary N-phase contact via a first spring, and the secondary rotating shaft is connected to a secondary N-phase contact via a second spring; the interlocking mechanism comprises a first limiting member, a second limiting member, a first adjusting mechanism, a second adjusting mechanism, and a fixed base; the first limiting member and the second limiting member are symmetrically mounted on the fixed base; the first adjusting mechanism is connected to the primary rotating shaft via a first connecting rod, and the second adjusting mechanism is connected to the secondary rotating shaft via a second connecting rod, characterized in that... The first adjustment mechanism includes a first locking bolt, a first swing arm, a first upper rotating shaft, a first lower rotating shaft, and a first short connecting rod. One end of the first swing arm passes through the first limiting member and is connected to one end of the first short connecting rod. The other end of the first swing arm is connected to the other end of the first short connecting rod through the first upper rotating shaft. The position of the other end of the first swing arm on the limiting member is adjustable. The first locking bolt passes through the first upper rotating shaft and is connected to the first lower rotating shaft. The second adjustment mechanism has the same structure as the first adjustment mechanism. The first limiting member is provided with a first guide groove, and during adjustment, one end of the first upper rotating shaft can move up and down along the first guide groove; The first limiting member further includes a first mating part and a first connecting part. The first mating part is provided with a first short arc surface and a first long arc surface. The first connecting part is provided with a first upper connecting hole and a first lower connecting hole. The second limiting member includes a second mating part and a second connecting part. The second mating part is provided with a second short arc surface and a second long arc surface. The second connecting part is provided with a second upper connecting hole and a second lower connecting hole. The first mating part and the second mating part are in contact and mating. The first connecting part is connected to the second connecting part by a spring. The first limiting member is rotatably connected to one end of the fixed base by a first lower rotating shaft. The second limiting member is rotatably connected to the other end of the fixed base by a second lower rotating shaft of the second adjusting mechanism.

2. The neutral line overlap switching mechanism as described in claim 1, characterized in that, The first upper rotating shaft is provided with a first upper threaded hole, and the first lower rotating shaft is provided with a first lower threaded hole. The first locking bolt passes through both the first upper threaded hole and the first lower threaded hole to fix the position of the first adjusting mechanism on the first limiting member.

3. The neutral line overlap switching mechanism as described in claim 1, characterized in that, The first limiting member and the second limiting member have the same structure.

4. The neutral line overlap switching mechanism as described in claim 1, characterized in that, A common closing cantilever is rotatably mounted on the common rotating shaft. One end of the common closing cantilever rests against the first shoulder of the common rotating shaft, and the other end of the common closing cantilever is restricted to axial movement along the rotation axis of the common rotating shaft by a first driving member on the common rotating shaft.

5. The neutral line overlap switching mechanism as described in claim 4, characterized in that, The first driving member is provided with a first concave point and a first driving shaft. The first concave point on the first driving member contacts and engages with a first protrusion provided on the commonly used closing cantilever. The first driving shaft on the first driving member contacts and engages with a first groove on the commonly used closing cantilever.

6. The neutral line overlap switching mechanism as described in claim 4, characterized in that, The commonly used closing cantilever includes a first upper hole and a first lower hole. The first upper hole of the commonly used closing cantilever is connected to one end of the interlocking mechanism through a first connecting rod, and the first lower hole of the commonly used closing cantilever is connected to the commonly used N-phase contact.

7. The neutral line overlap switching mechanism as described in claim 4, characterized in that, The spare rotating shaft is equipped with a spare closing cantilever, which has the same structure as the regular closing cantilever. The regular rotating shaft has the same structure as the spare rotating shaft, and the regular rotating shaft and the spare rotating shaft are mirror images of each other on the base.

8. A dual-power automatic transfer switch, comprising a base, a normal operating mechanism, a standby operating mechanism, and a neutral line overlap switching mechanism, wherein the normal operating mechanism, the standby operating mechanism, and the neutral line overlap switching mechanism are all mounted on the base, characterized in that, The neutral line overlap switching mechanism is the neutral line overlap switching mechanism described in any one of claims 1 to 7.

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