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, an interlocking mechanism, a first spring and a second spring, the common rotating shaft is connected with the standby rotating shaft through the interlocking mechanism, the common rotating shaft is connected with a common N-phase contact through a first tension spring, and the standby rotating shaft is connected with a standby N-phase contact through a second tension spring, characterized in that the interlocking mechanism comprises a first limiting piece, a second limiting piece and a fixing base, the first limiting piece and the second limiting piece are symmetrically installed on the fixing base, and the first limiting piece is connected with the second limiting piece through a spring; the first limiting piece is connected with the common rotating shaft through a first connecting rod, a first adjusting mechanism is installed on the first limiting piece and used for adjusting the rotation angle of the first limiting piece, and a second adjusting mechanism is installed on the second limiting piece and used for adjusting the rotation angle of the second limiting piece.

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 primary rotating shaft, a secondary rotating shaft, an interlocking mechanism, a first spring, and a second spring. The primary rotating shaft is connected to the secondary rotating shaft via the interlocking mechanism. The primary rotating shaft is connected to the primary N-phase contact via the first spring. The secondary rotating shaft is connected to the secondary N-phase contact via the second spring. The interlocking mechanism comprises a first limiting member, a second limiting member, and a fixed base. The first limiting member and the second limiting member are symmetrically mounted on the fixed base. The first limiting member is connected to the second limiting member via a spring. The first limiting member is connected to the primary rotating shaft via a first connecting rod. A first adjusting mechanism is mounted on the first limiting member to adjust its rotation angle. A second adjusting mechanism is mounted on the second limiting member to adjust its rotation angle.

[0006] Furthermore, the first adjustment mechanism includes a first half gear, a first internal gear portion, and a first baffle. The first internal gear portion is disposed in the middle of the first limiting member. The first half gear meshes with the first internal gear portion. The first half gear is positioned by the first baffles installed on both sides of the first limiting member. The first half gear is provided with a first mounting hole for connecting to one end of the first connecting rod. The second adjustment mechanism has the same structure as the first adjustment mechanism.

[0007] Furthermore, the number of teeth on the first half gear is less than the number of teeth on the first internal gear.

[0008] Furthermore, the first limiting member also includes a first mating part and a first connecting part, and the second limiting member also includes a second mating part and a second connecting part. The first mating part and the second mating part are in contact and mating, and the first connecting part is connected to the second connecting part by a spring. The first limiting member and the second limiting member have the same structure.

[0009] Furthermore, 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 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 upper connecting hole is connected to the first upper connecting hole by a spring, the first limiting member is rotatably connected to one end of the fixed base through the first lower connecting hole, and the second limiting member is rotatably connected to the other end of the fixed base through the second lower connecting hole.

[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 rotating 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 mounted on the base in a mirror image.

[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 it includes the aforementioned neutral line overlap switching mechanism.

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

[0016] 1. The neutral line overlap switching mechanism of the present invention achieves sequential operation through the surface contact between the first limiting member and the second limiting member. That is, when the N pole on one side completes the closing action, the N pole on the other side can perform the opening action. Its operation has good stability and high accuracy.

[0017] 2. The neutral line overlap switching mechanism of the present invention can adjust the overlap time by changing the size of the arc features on the first and second limiting members;

[0018] 3. The neutral line overlap switching mechanism of the present invention can change the rotation angle of the first or second limiting member by adjusting the position of the first half gear or the second half gear on the first or second limiting member, thereby compensating for manufacturing or assembly errors. Attached Figure Description

[0019] 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;

[0020] Figure 2 This is a schematic diagram of the structure of a specific embodiment of the present invention, in which phases A, B, C, and N of the common mechanism are in the closed state and phases A, B, C, and N of the standby mechanism are in the open state;

[0021] Figure 3 for Figure 1 A structural diagram of a commonly used rotating shaft, numbered 2A in the middle;

[0022] Figure 4 for Figure 3 A schematic diagram of the commonly used closing cantilever with serial number 21A in the middle section;

[0023] Figure 5 This is an exploded view of the interlocking mechanism in a specific embodiment of the present invention;

[0024] Figure 6 for Figure 5 A schematic diagram of the structure of the first limiting component, numbered 42A in the middle section;

[0025] Figure 7 for Figure 5 A schematic diagram of the first half gear, numbered 45A in the middle section;

[0026] Figure 8 This is a schematic diagram illustrating the working principle of the neutral line overlap switching mechanism in a specific embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of the structure of the first limiting member and the second limiting member cooperating in a specific embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram illustrating the failure mode of the neutral line overlap switching mechanism in a specific embodiment of the present invention: incomplete closing.

[0029] Figure 11 This is a schematic diagram of the structure of the first and second limiting members in a specific embodiment of the present invention when they are adjusted in the forward direction;

[0030] Figure 12 This is a schematic diagram illustrating another failure mode of the neutral line overlap switching mechanism in a specific embodiment of the present invention: overclosing.

[0031] Figure 13 This is a schematic diagram of the structure of the first and second limiting members when they are negatively adjusted in a specific embodiment of the present invention;

[0032] Explanation of serial number

[0033] 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-Second protrusion, 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 component, 421A-First short arc surface, 422A-First long arc surface, 423A-First internal tooth, 424A-First upper connecting hole, 425A-First... The following are the connecting holes: 426A - First round hole; 41B - Second connecting rod; 42B - Second limiting member; 421B - Second short arc surface; 422B - Second long arc surface; 423B - Second internal tooth; 424B - Second upper connecting hole; 425B - Second lower connecting hole; 426B - Second round hole; 43 - Fixed seat; 44 - Tension spring; 45A - First half gear; 451A - First external tooth; 452A - First mounting hole; 451B - Second external tooth; 452B - Second mounting hole; 45B - Second half gear; 46 - First baffle; 47 - Second baffle; 51A - Normal N-phase contact; 51B - Spare N-phase contact; 52A - Normal power supply A, B, C three-phase contact; 52B - Spare power supply A, B, C three-phase contact; 6A - First spring; 6B - Second spring. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] like Figure 1-2 As 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 51B. 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 51B. 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 three-phase contacts 52A of the primary power supply (A, B, and C) and the moving contact 51A of the primary N-phase 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 moving contact 51A of the primary N-phase and the moving contact 51B of the standby N-phase, the three-phase contacts 52B of the standby power supply (A, B, and C) and the moving contact 51B of the standby N-phase are opened. 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.

[0040] like Figure 2-4 As 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 2A also rotates in the same direction under the drive of the first driving member 20.

[0041] 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 2A. 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 cantilever 2B 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.

[0042] 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.

[0043] 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 fixed base 43 in the present invention has a "˽"-shaped structure. During installation, the first limiting member 42A and the second limiting member 42B are symmetrically placed in the "˽"-shaped groove of the fixed base 43. The first limiting member 42A is rotatably installed at one end of the fixed base 43 by a pin passing through the first lower connecting hole 425A, and the second limiting member 42B is rotatably installed at the other end of the fixed base 43 by a pin passing through the second lower connecting hole 425B. The upper end of the first limiting member 42A is connected to the upper end of the second limiting member 42B by a spring 44. The spring 44 in the present invention is a tension spring. The first connecting rod 41A is rotatably installed in the middle of the first limiting member 42A, and the second connecting rod 41B is rotatably installed in the middle of the second limiting member 42B.

[0044] like Figure 6As shown, in a specific embodiment of the present invention, the first limiting member 42A includes a first mating part and a first connecting part. 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 and a first lower connecting hole 425A. A first internal toothed part 423A is provided in the middle of the first limiting member 42A to accommodate a first half-gear 45A. The first half-gear 45A is positioned by a first baffle 46A and a first circular hole 426A installed on both sides of the first limiting member 42A. Similarly, the second limiting member of the present invention... The component 42B includes a second mating part and a second connecting part. The second mating part has a second short arc surface 421B and a second long arc surface 422B. The second connecting part has a second upper connecting hole 424B and a first lower connecting hole 425B. A second internal toothed part 423B is provided in the middle of the second limiting member 42B to accommodate a second half gear 45B. The second half gear 45B is positioned by a second baffle 46B and a second circular hole 426B installed on both sides of the second limiting member 42B. The first limiting member 42A and the second limiting member 42B in this invention have the same structure. The neutral line overlap switching mechanism of this invention can adjust the overlap time by changing the size of the arc features on the first limiting member 42A and the second limiting member 42B.

[0045] like Figure 7 As shown, the first half gear 45A of the present invention is provided with a first mounting hole 452A and a first external tooth portion 451A, which meshes with a first internal tooth portion 423A; similarly, the second half gear 45B is provided with a second mounting hole 452B and a second external tooth portion 451B, which meshes with a second internal tooth portion 423B. In the present invention, the number of teeth on the first external tooth portion 451A is less than the number of teeth on the first internal tooth portion 423A.

[0046] During installation, firstly, place the first half gear 45A into the first internal tooth portion 423A of the first limiting member 42A, and then position the first half gear 45A using the first baffles 46 installed on both sides of the first limiting member 42A. Similarly, place the second half gear 45B into the second internal tooth portion 423B of the second limiting member 42B, and position the second half gear 45B using the second baffles 47 installed on both sides of the second limiting member 42B. Then, symmetrically place the installed first limiting member 42A and second limiting member 42B into the "˽" groove of the fixing base 43, use the first mating part to contact and engage with the second mating part, and rotatably install the first limiting member 42A onto the fixing base by passing a shaft pin through the first lower connecting hole 425A. One end of the first limiting member 42B is rotatably mounted on the other end of the fixed base 43 via a pin passing through the second lower connecting hole 425B. Then, a spring 44 connects the first upper connecting hole 423A at the upper end of the first limiting member 42A to the second upper connecting hole 423B at the upper end of the second limiting member 42B. Finally, the first limiting member 42A is connected to one end of the first connecting rod 41A via the first mounting hole 452A, and the other end of the first connecting rod 41A is connected to the first hole 213A on the commonly used closing cantilever 21A. The second limiting member 42B is connected to one end of the second connecting rod 41B via the second mounting hole 452B, and the other end of the second connecting rod 41B is connected to the second hole 213B on the spare closing cantilever 21B. The neutral line overlap switching mechanism of this invention achieves sequential operation through surface contact between the first and second limiting members, meaning that the other N-pole can only open when one side completes closing, resulting in good operational stability and high accuracy.

[0047] like Figure 8-9 As shown, the distance between the rotation axis of the common rotating shaft 2A and the rotation axis of the first connecting rod 41A near the common rotating shaft 2A (the center of the first upper hole 213A of the common closing cantilever 21A) is L1. The distance between the rotation axes of the two ends of the first connecting rod 41A (the center of the first upper hole 213A and the center of the first mounting hole 452A) is L2. The distance between the rotation axis of the first connecting rod 41A near the first limiting member 42A (the center of the first mounting hole 452A) and the rotation axis of the first limiting member 42A (the center of the first lower connecting hole 425A) is L3. At this time, the rotation angle of the first limiting member 42A is α.

[0048] During normal installation, the first external toothed portion 451A and the first internal toothed portion 423A are symmetrically engaged in a centered manner. At this time, the distance between the center of the first mounting hole 452A and the center of the first lower connecting hole 425A is L3. The first mating part of the first limiting member 42A and the second mating part of the second limiting member 42B are normally engaged. No adjustment is required at this time, and the dual power automatic transfer switch can work normally.

[0049] If an error occurs during manufacturing or assembly, causing the rotation angle α of the first limiting component 42A to be too small, it will result in the operating mechanism failing to close properly. That is, the normally used N-phase contact 51A may be closed, but because the second limiting component 42B on the backup power supply side is locked by the first limiting component 42A on the normally used power supply side and cannot rotate, the backup power supply N-phase contact 51B cannot open. Figure 10 As shown. At this point, the first baffle 46A can be released. By adjusting the engagement position of the first external tooth 451A on the first half gear 45A and the second external tooth 423A on the second limiting member 42A clockwise (forward adjustment) by N tooth positions, L3 is used to decrease the rotation angle α of the first limiting member 42A, as shown. Figure 11 As shown, if the circuit breaker still fails to engage properly, continue adjusting the position of the mating teeth in the forward direction until it can switch normally. After adjustment, fix the position of the first half gear 45A by passing the first baffle 46A.

[0050] Conversely, if errors occur during manufacturing or assembly that cause the rotation angle α of the first limiting component 42A to be too large, it will lead to excessive closing of the operating mechanism, such as... Figure 12 As shown, there is a gap between the first limiting member 42A and the second limiting member 42B at this time. Although all actions can be completed, the excessive gap between the first limiting member 42A and the second limiting member 42B will cause the commonly used N-phase contact 51A to overtravel excessively. 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 first baffle 46A is released, and the mating position of the first external tooth 451A on the first half gear 45A and the first internal tooth 423A on the first limiting member 42A is adjusted counterclockwise (negative adjustment) by N tooth positions. By increasing L3, the rotation angle α of the second limiting member 42A is reduced, thereby eliminating the gap. Figure 13 As shown, if a gap still exists between the first limiting member 42A and the second limiting member 42B, the position of the mating teeth can be adjusted negatively until the gap is eliminated. After adjustment, the position of the first half gear 45A is fixed by the first baffle 46A. The neutral line overlap switching mechanism of the present invention can change the rotation angle of the first limiting member 42A or the second limiting member 42B by adjusting the mating position of the first half gear 45A or the second half gear 45B on the first limiting member 42A or the second limiting member 42B, thereby compensating for manufacturing or assembly errors and improving the working accuracy and stability of the neutral line overlap switching mechanism.

[0051] The working principle of the dual-power automatic transfer switch neutral line overlap switching mechanism of the present invention is as follows:

[0052] 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.

[0053] 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 second driving component. The lower end of the standby closing cantilever 21B drives the standby N phase moving contact 51B to close. The upper end of the standby closing cantilever 21B is connected to the second connecting component. Rod 41B pulls the second limiting member 42A 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 standby power supply N-phase contact 51B is just closed, while the normal power supply N-phase contact 51A is not yet open (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 spring 44 and first spring 6A. When the standby closing arm 21B continues to rotate counterclockwise until the standby 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 tension spring 44 and first spring 6A. It also pushes the normal closing arm 21A to rotate counterclockwise through the first connecting rod 41A. The normal N-phase contact 21A is lifted under the action of the first spring 6A and the normal closing arm 21A, and the normal N-phase contact 51A is opened.

[0054] When the main power supply returns to normal, when the dual power supply automatic transfer switch switches from the middle position (when 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 perform closing action. 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 cantilever 21A to rotate clockwise. The lower end of the main power supply closing cantilever 21A drives the main power supply N phase moving contact 51A to perform closing action. The upper end of the main power supply closing cantilever 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 limiting member 42A's first... When a short arc surface 421A contacts the second short arc surface 421B of the second limiting member 42B, the N-phase contact 51A of the normal power supply is just closed, while the N-phase contact 51B of the standby power supply is not yet open (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 normal closing arm 21A continues to rotate clockwise until the normal 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 21B is lifted under the force of the second spring 6B and the standby closing arm 21B, and the standby N-phase contact 51B is opened.

[0055] 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, an interlocking mechanism, a first spring, and a second spring, 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 the first spring, and the secondary rotating shaft is connected to a secondary N-phase contact via the second spring, characterized in that, The interlocking mechanism includes a first limiting member, a second limiting member, and a fixed base. The first limiting member and the second limiting member are symmetrically mounted on the fixed base. The first limiting member is connected to the second limiting member by a spring. The first limiting member is connected to the common rotating shaft by a first connecting rod. A first adjusting mechanism is installed on the first limiting member to adjust the rotation angle of the first limiting member. A second adjusting mechanism is installed on the second limiting member to adjust the rotation angle of the second limiting member. The first adjustment mechanism includes a first half gear, a first internal tooth portion and a first baffle. The first internal tooth portion is disposed in the middle of the first limiting member. The first half gear meshes with the first internal tooth portion. The first half gear is positioned by the first baffles installed on both sides of the first limiting member. The first half gear is provided with a first mounting hole for connecting to one end of the first connecting rod. The first limiting member further includes a first mating part and a first connecting part, and the second limiting member further includes a second mating part and a second connecting part. The first mating part and the second mating part are in contact and mating, and the first connecting part is connected to the second connecting part by a spring.

2. The neutral line overlap switching mechanism as described in claim 1, characterized in that, The second adjustment mechanism has the same structure as the first adjustment mechanism.

3. The neutral line overlap switching mechanism as described in claim 2, characterized in that, The number of teeth on the first half gear is less than the number of teeth on the first internal gear.

4. The neutral line overlap switching mechanism as described in claim 2, characterized in that, The first limiting member and the second limiting member have the same structure.

5. The neutral line overlap switching mechanism as described in claim 4, characterized in that, 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 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 upper connecting hole is connected to the first upper connecting hole by a spring, the first limiting member is rotatably connected to one end of the fixed base through the first lower connecting hole, and the second limiting member is rotatably connected to the other end of the fixed base through the second lower connecting hole.

6. 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.

7. The neutral line overlap switching mechanism as described in claim 6, 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.

8. The neutral line overlap switching mechanism as described in claim 6, 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.

9. The neutral line overlap switching mechanism as described in claim 6, characterized in that, The commonly used closing cantilever and the standby rotating cantilever have the same structure, and the commonly used rotating shaft and the standby rotating shaft have the same structure. The commonly used rotating shaft and the standby rotating shaft are mounted on the base in a mirror image.

10. 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 9.

Images