Automatic change-over switch with neutral line overlapping function

Abstract

The invention discloses an automatic change-over switch with a neutral line overlapping function, which comprises a first contact assembly and a second contact assembly, the first contact assembly and the second contact assembly are oppositely arranged on a shell, the first contact assembly is connected with a main power supply and a load, and the second contact assembly is connected with a standby power supply and the load; the device further comprises a limiting assembly which is used for achieving neutral pole overlapping. Compared with the prior art, the automatic change-over switch can realize the overlapping time of the neutral poles, so that the neutral pole of one path of power supply and the neutral pole of the other path of power supply are simultaneously and temporarily switched on in the power supply conversion process of the automatic change-over switch, and the over travel, the open distance and the final pressure of the neutral poles are not lost.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances, and in particular to an automatic transfer switch. Background Art

[0002] The dual power automatic transfer switch is a commonly used low-voltage electrical appliance, which is often used for the conversion between two power sources to ensure that when one power source fails or stops supplying power, it can quickly switch to the other power source to ensure the normal power supply of the load circuit. In some special application places, such as computer control systems, data centers and other application places, it is required that the neutral pole (N pole) of the dual power source cannot be disconnected from the ground terminal of the equipment at the moment of conversion during the power conversion process.

[0003] With the development of technology, people have put forward higher requirements for the safety, reliability and connectivity of power supply while the requirements for technical performance indicators are getting higher and higher. If the power supply of the data center fails, it means a large amount of data will be lost. Therefore, people use a dual power conversion switch and an uninterruptible power supply (UPS) to combine power supply to ensure the continuity of its power supply. At present, the structure of the three phase poles and the N pole of the general dual power supply is the same. During the conversion process, the phase pole and the N pole will be disconnected or closed at the same time, so that the neutral pole of the dual power supply and the grounding terminal of the load device are briefly disconnected during the conversion process, thereby causing the zero-ground potential of the load device to change. The short moment when the neutral pole of the UPS is not connected to the neutral pole of any power supply will cause the neutral pole of the UPS to change relative to the ground potential, which will have an adverse effect on the load equipment, and even cause the load equipment (such as servers, etc.) to restart or data damage.

[0004] Therefore, the present invention needs to provide an automatic transfer switch with a neutral line overlap function, so that during the power conversion process, the neutral pole of one power source and the neutral pole of another power source are briefly connected at the same time, and the overtravel, open distance and final pressure of the neutral pole are not lost. Summary of the invention

[0005] The object of the present invention is to provide an automatic transfer switch with a neutral line overlap function, thereby solving the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: An automatic transfer switch with a neutral line overlap function, comprising a first contact assembly and a second contact assembly, wherein the first contact assembly and the second contact assembly are relatively mounted on a housing, the first contact assembly connects a main power supply and a load, and the second contact assembly connects a standby power supply and a load; The first contact assembly comprises: a first stationary contact, a main operating mechanism, and a first moving contact, wherein the first stationary contact, the main operating mechanism, and the first moving contact are all mounted on the housing; The second contact assembly comprises: a second static contact, a backup operating mechanism, and a second moving contact, and the first static contact, the main operating mechanism and the first moving contact are all mounted on the housing; It also includes a limit assembly, which is located on the upper part of the first moving contact and the second moving contact, and one end of the limit assembly is fixed on the main shaft of the main operating mechanism and the main shaft of the backup operating mechanism, and the other end of the limit assembly is respectively connected to the first moving contact and the second moving contact, and the limit assembly is used to realize the length of time of neutral pole overlap.

[0007] Further, the limit assembly includes a first limit assembly and a second limit assembly, one end of the first limit assembly is fixedly mounted on the main shaft of the main operating mechanism, the other end of the first limit assembly is mounted on the bracket assembly, one end of the second limit assembly is fixedly mounted on the main shaft of the backup operating mechanism, and the other end of the second limit assembly is fixedly mounted on the bracket assembly.

[0008] Furthermore, the bracket assembly comprises a first bracket and a second bracket, the first bracket and the second bracket are arranged in parallel, and the first bracket and the second bracket are both provided with a U-shaped groove.

[0009] Furthermore, a sliding groove is provided on the side walls of the first bracket and the second bracket which are relatively far away from each other, and a compression spring is provided in the sliding groove.

[0010] Furthermore, the slide groove includes a transverse groove and a vertical groove, the upper end of the vertical groove is connected to one end of the vertical groove, the vertical groove is connected to the transverse groove, the compression spring is located in the vertical groove, and the lower end of the compression spring is fixed to the lower end of the vertical groove.

[0011] Further, the first limiting assembly includes a first limiting rod and a first push rod, one end of the first limiting rod is rotatably connected to one end of the first bracket, the other end of the first limiting rod is connected to a first connecting shaft provided on the main shaft of the main operating mechanism, the end of the first limiting rod close to the first connecting shaft can hook the first connecting shaft or tilt up, one end of the first push rod is connected to one end of the second bracket in a sliding manner, and the other end of the first push rod is fixed to the main shaft of the main operating mechanism through a first limiting member; The second limiting assembly includes a second limiting rod and a second push rod, one end of the second limiting rod is rotatably connected to one end of the second bracket, the other end of the second limiting rod is connected to a second connecting shaft arranged on the main shaft of the backup operating mechanism, the end of the second limiting rod close to the second connecting shaft can hook the second connecting shaft or tilt, one end of the second push rod is connected to one end of the first bracket in a sliding manner, and the other end of the second push rod is fixed to the main shaft of the backup operating mechanism through a second limiting member; The main operating mechanism main shaft is also provided with a plurality of first neutral pole cantilevers, which are rotatably connected to the first moving contact; the backup operating mechanism main shaft is also provided with a plurality of second neutral pole cantilevers, which are rotatably connected to the second moving contact.

[0012] Further, the first connecting shaft is fixed to the main shaft of the main operating mechanism through two first fixing plates, wherein a spacing is provided between the two first fixing plates, one end of the two first fixing plates close to the main shaft of the main operating mechanism is connected to the main shaft of the main operating mechanism, both ends of the first connecting shaft are connected to the upper ends of the two first fixing plates, and one end of the two first fixing plates away from the bracket is further provided with a first return spring, one end of the first return spring is fixed to the two first fixing plates, and the other end of the first return spring is fixed to the base through a first fixing member; The second connecting shaft is fixed to the standby operating mechanism main shaft row through two second fixing plates, wherein a spacing is provided between the two second fixing plates, one end of the two second fixing plates close to the standby operating mechanism main shaft is connected to the standby operating mechanism main shaft, both ends of the second connecting shaft are connected to the upper ends of the two second fixing plates, and a second return spring is further provided at one end of the two second fixing plates away from the bracket, one end of the second return spring is fixed to the two second fixing plates, and the other end of the second return spring is fixed to the base through a second fixing piece.

[0013] Furthermore, the first limiting rod and the second limiting rod are respectively provided with a recessed portion on one side close to the first connecting shaft and the second connecting shaft, and the recessed portion extends toward an end away from the first connecting shaft and the second connecting shaft.

[0014] Further, the first moving contact comprises a first neutral pole moving contact and a first phase pole moving contact, the first phase pole moving contact and the first neutral pole moving contact are installed in parallel and close to one side of the limit assembly, and one end of the first neutral pole moving contact and the first phase pole moving contact are rotatably installed on the housing through a moving contact mounting plate; The second moving contact includes a second neutral pole moving contact and a second phase pole moving contact. The second phase pole moving contact is installed in parallel with the second neutral pole moving contact and close to one side of the limiting assembly. One end of the second neutral pole moving contact and the second phase pole moving contact are rotatably installed on the housing through a moving contact mounting plate shell.

[0015] Further, the first static contact comprises: a first neutral pole static contact and a first phase pole static contact, the first neutral pole static contact and the first phase pole static contact are arranged in parallel, and the first neutral pole static contact is arranged correspondingly to the first neutral moving contact, and the first phase pole static contact is arranged correspondingly to the first phase pole moving contact; The second static contact includes: a second neutral pole static contact and a second phase pole static contact, the second neutral pole static contact and the second phase pole static contact are arranged in parallel, and the second neutral pole static contact is arranged correspondingly to the second neutral moving contact, and the second phase pole static contact is arranged correspondingly to the second phase pole moving contact.

[0016] The beneficial effects of the present invention are: Since the present invention is provided with a limit assembly, the length of the first push rod and the second push rod of the limit assembly can be increased or decreased, and the overlap time of the neutral pole is achieved by adjusting the length of the first push rod and the second push rod, so that during the power conversion process, the automatic transfer switch can have the neutral pole of one power supply and the neutral pole of another power supply briefly connected at the same time, and the overtravel, open distance and final pressure of the neutral pole are not lost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an automatic transfer switch with a neutral line overlap function of the present invention; Figure 2 This is a common opening state diagram of the automatic transfer switch with neutral line overlap function of the present invention; Figure 3 It is a structural diagram of the limit assembly of the present invention; Figure 4 It is a schematic diagram of the structure of the limit assembly of the present invention; Figure 5 This is a commonly used closing state diagram of the automatic transfer switch with neutral line overlap function of the present invention; Figure 6 It is a schematic diagram of the shell structure of the present invention; Figure 7 It is a state diagram of the standby closing process of the present invention; Figure 8 This is a diagram of the standby closing state of the present invention.

[0018] Reference numerals: A first static contact 1, a main operating mechanism 2, a first moving contact 3, a housing 4, a main operating mechanism main shaft 5, a mounting bracket 6, a limit assembly 7, a first limit assembly 8, a bracket assembly 9, a first bracket 10, a slide groove 11, a compression spring 12, a first connecting shaft 13, a first neutral pole cantilever 14, a first fixing plate 15, a first return spring 16, a first fixing member 17, a first neutral pole static contact 21, a first phase pole static contact 22, a first neutral pole moving contact 31, a first phase pole moving contact 32, a first limit rod 81, a first push rod 82, and a first limit member 83; The second static contact 1′, the backup operating mechanism 2′, the second moving contact 3′, the backup operating mechanism main shaft 5′, the second limiting assembly 8′, the second bracket 10′, the second connecting shaft 13′, the second neutral pole cantilever 14′, the second fixed plate 15′, the second reset spring 16′, the second fixing member 17′, the second neutral pole static contact 21′ and the second phase pole static contact 22′, the second limiting member 81′ push the second push rod 82′, the second limiting member 83′. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0023] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0024] like Figures 1 to 8As shown, an automatic transfer switch with a neutral line overlap function includes a first contact assembly and a second contact assembly, wherein the first contact assembly and the second contact assembly are relatively mounted on a housing 4, the first contact assembly connects a main power supply and a load, and the second contact assembly connects a backup power supply and a load; The first contact assembly comprises: a first stationary contact 1, a main operating mechanism 2, and a first moving contact 3, wherein the first stationary contact 1 is fixedly mounted on a housing 4, and the main operating mechanism 2 is mounted on the housing 4; The second contact assembly comprises: a second static contact 1', a backup operating mechanism 2', and a second moving contact 3', wherein the second static contact 1' is fixedly mounted on the housing 4, and the backup operating mechanism 2' is mounted on the housing 4; It also includes a limit assembly 7, which is located on the upper part of the first moving contact 3 and the second moving contact 3′, and one end of the limit assembly 7 is fixed to the main operating mechanism main shaft 5 and the backup operating mechanism main shaft 5′, and both ends of the main operating mechanism main shaft 5 and the backup operating mechanism main shaft 5′ are fixed to the mounting bracket 6, and the other end of the limit assembly 7 is respectively connected to the first moving contact 3 and the second moving contact 3′, and the limit assembly 7 is used to realize the length of time for which the neutral pole overlaps.

[0025] From the above method, it can be known that, since the limit assembly 7 is provided in the present invention, the length of the first push rod and the second push rod of the limit assembly 7 can be increased or decreased, and the overlap time of the neutral pole is achieved by adjusting the length of the first push rod and the second push rod, so that during the power conversion process, the neutral pole of one power supply and the neutral pole of another power supply of the automatic transfer switch are briefly connected at the same time, and the overtravel, open distance and final pressure of the neutral pole are not lost.

[0026] Specifically, it should be noted that the limit assembly 7 includes a first limit assembly 8 and a second limit assembly 8′, the first limit assembly 8 and the second limit assembly 8′ are arranged relatively to each other, one end of the first limit assembly 8 is fixedly mounted on the main shaft 5 of the main operating mechanism, and the other end of the first limit assembly 8 is mounted on the bracket assembly 9, one end of the second limit assembly 8′ is fixedly mounted on the main shaft 5′ of the standby operating mechanism, and the other end of the second limit assembly 8′ is fixedly mounted on the bracket assembly 9. The overlap time is achieved by setting the first limit assembly 8 and the second limit assembly 8′ and by adjusting the length of the first push rod and the second push rod. When the length of the first push rod or the second push rod increases, the overlap time will become shorter, and when the length of the first push rod and the second push rod decreases, the overlap time will increase, thereby ensuring that the overtravel, open distance and final pressure of the neutral pole are not lost.

[0027] In addition, it should be noted that, in order to enable the first push rod and the second push rod to slide, the support assembly comprises a first support 10 and a second support 10′, the first support 10 and the second support 10′ are arranged in parallel, the first support 10 and the second support 10′ are both provided with a U-shaped groove, and a slide groove 11 is further provided on the side walls that are relatively far away from the first support 10 and the second support 10′, and a compression spring 12 is provided in the slide groove 11, and the first push rod and the second push rod can slide in the slide groove 11 by providing the slide groove 11; Specifically, in this embodiment, the slide groove 11 includes a horizontal groove and a vertical groove, the upper end of the vertical groove is connected to one end of the vertical groove, the vertical groove is communicated with the horizontal groove, and the horizontal groove and the vertical groove are made by integral molding. The compression spring 12 is located in the vertical groove, and the lower end of the compression spring 12 is fixed to the lower end of the vertical groove. Through the arrangement of the compression spring 12, the first limit rod and the second limit rod are respectively hooked with the first connecting shaft and the second connecting shaft, so that the first neutral pole moving contact or the second neutral pole moving contact can be in a closed state.

[0028] In addition, it should be noted that the first limiting assembly 8 includes a first limiting rod 81 and a first push rod 82, one end of the first limiting rod 81 is rotatably connected to one end of the first bracket 10, the other end of the first limiting rod 81 is connected to the first connecting shaft 13 provided on the main operating mechanism main shaft 5, the end of the first limiting rod 81 close to the first connecting shaft 13 can hook the first connecting shaft or tilt, one end of the first push rod 82 is connected to one end of the second bracket 10′ in a sliding manner, and the other end of the first push rod 82 is fixed to the main operating mechanism main shaft 5 through a first limiting member 83. In addition, in order to limit the sliding of the first connecting shaft 13 within a certain range, a limiting slide groove is also provided on the first limiting member 83, and the end of the first connecting shaft close to the first limiting member 83 is located in the limiting slide groove, so that the first connecting shaft 13 slides in the limiting slide groove; The second limiting assembly 8' comprises a second limiting rod 81' and a second push rod 82', one end of the second limiting rod 81' is rotatably connected to one end of the second bracket 10', the other end of the second limiting rod 81' is connected to a second connecting shaft 13' provided on the main shaft 5' of the backup operating mechanism, the end of the second limiting rod 81' close to the second connecting shaft 13' can hook the second connecting shaft 13' or tilt, one end of the second push rod 82' is connected to one end of the first bracket 10 by sliding, the other end of the second push rod 82' is fixed to the main shaft 5' of the backup operating mechanism by a second limiting member 83', in addition, in order to limit the second connection The shaft 13' slides within a certain range, and a limiting slide groove is further provided on the second limiting member 83'. One end of the second connecting shaft 13' close to the first limiting member 83' is located in the limiting slide groove, so that the second connecting shaft 13' slides in the limiting slide groove. Through the cooperation of the first limiting rod 81, the first push rod 82, the second limiting rod 81' and the second push rod 82', the first limiting rod 81 and the second limiting rod 82' can be tilted or hooked on the first connecting shaft 13 or the second connecting shaft 13', and the length of the first push rod 82 and the second push rod 82 can be increased or decreased, thereby achieving a longer or shorter overlapping time, ensuring that the overtravel, opening distance and final pressure of the neutral pole are not lost; The main operating mechanism main shaft is also provided with a plurality of first neutral pole cantilevers 14, which are rotatably connected to the first moving contact 3. The standby operating mechanism main shaft 5′ is also provided with a plurality of second neutral pole cantilevers 14′, which are rotatably connected to the second moving contact 3′. Since the first neutral pole cantilever 14 is connected to the first moving contact 3 and the second neutral pole cantilever 14′ is connected to the second moving contact 3′, when the switching switch is normally closed or opened or the standby closing or opening is performed, the neutral pole is opened and closed by adjusting the length of the first limit member 81 and the second limit member 82′.

[0029] In addition, it is worth noting that the first connecting shaft 13 is fixed to the main operating mechanism main shaft 5 through two first fixing plates 15, wherein a spacing is provided between the two first fixing plates 15, one end of the two first fixing plates 15 close to the main operating mechanism main shaft 5 is connected to the main operating mechanism main shaft 5, both ends of the first connecting shaft 13 are connected to the upper ends of the two first fixing plates 15, and one end of the two first fixing plates 15 away from the bracket is further provided with a first return spring 16, one end of the first return spring 16 is fixed to the two first fixing plates 15, and the other end of the first return spring 16 is fixed to the base through a first fixing member 17; The second connecting shaft 13′ is fixed to the backup operating mechanism main shaft 5′ through two second fixing plates 15′, wherein a spacing is provided between the two second fixing plates 15′, and one end of the two second fixing plates 15′ close to the backup operating mechanism main shaft 5′ is connected to the backup operating mechanism main shaft 5′, and both ends of the second connecting shaft 13′ are connected to the upper ends of the two second fixing plates 15′, and one end of the two second fixing plates 15′ away from the bracket is also provided with a second return spring 16, one end of the second return spring is fixed to the two second fixing plates 15′, and the other end of the second return spring 16′ is fixed to the base through a second fixing member 17′. Since the first connecting shaft 13 and the second connecting shaft 13′ are provided, The first limit rod 81 and the second limit rod 82′ can respectively hook the first connecting shaft 13 and the second connecting shaft 13′ when closing and opening the switch, so that the neutral pole contact on the common side or the spare side is in the closed state or the open state. During the specific installation, the first fixed plate 15 and the second fixed plate 15′ are also provided with holes, and one end of the first reset spring 16 and the second reset spring 16′ are respectively hooked on the holes of the first fixed plate 15 and the second fixed plate 15′. In this embodiment, the number of the first reset spring and the second reset spring are both 2. By setting the first reset spring 16 and the second reset spring 16′, the first neutral cantilever and the second neutral cantilever rotate under the pulling force of the first reset spring 16 and the second reset spring 16′ to realize the closing and opening of the neutral pole.

[0030] The first limiting rod 81 and the second limiting rod 82' are respectively provided with a recess 18 on one side close to the first connecting shaft 13 and the second connecting shaft 13', and the recess 18 extends to one end away from the first connecting shaft 13 and the second connecting shaft 13', so as to hook the first connecting shaft 13 and the second connecting shaft 13'.

[0031] In addition, it should be noted that the first moving contact includes a first neutral pole moving contact 31 and a first phase pole moving contact 32, the first phase pole moving contact 32 is installed in parallel with the first neutral pole moving contact 31 and close to one side of the limit assembly, and one end of the first neutral pole moving contact 31 and the first phase pole moving contact 32 are rotatably installed on the housing 4 through a moving contact mounting plate; The second moving contact comprises a second neutral pole moving contact and a second phase pole moving contact 32', the second phase pole moving contact 32' and the second neutral pole moving contact are installed in parallel and close to one side of the limit assembly, and one end of the second neutral pole moving contact and the second phase pole moving contact 32' are rotatably installed on the housing 4 through a moving contact mounting plate; The first static contact 1 comprises: a first neutral pole static contact 21 and a first phase pole static contact 22, the first neutral pole static contact 21 and the first phase pole static contact 22 are arranged in parallel, and the first neutral pole static contact 21 is arranged correspondingly to the first neutral moving contact 31, and the first phase pole static contact 22 is arranged correspondingly to the first phase pole moving contact; The second static contact includes: a second neutral pole static contact 21′ and a second phase pole static contact 22′, the second neutral pole static contact 21′ and the second phase pole static contact 22′ are arranged in parallel, and the second neutral pole static contact 21′ is arranged correspondingly to the second neutral moving contact, and the second phase pole static contact 22′ is arranged correspondingly to the second phase pole moving contact 32′, and the first neutral moving contact and the first neutral pole static contact 21 and the second neutral pole moving contact 31 and the second neutral pole static contact 21′ are opened and closed under the condition of ensuring that the overtravel, opening distance and final pressure of the neutral pole are not lost through the first limiting member 81 and the second limiting member 82′.

[0032] In actual use, when the transfer switch is in the normal closing state, the first neutral pole moving contact 31 and the first phase pole moving contact 32 are both in the closing state. At this time, the compression spring 12 acts on the end of the first limiting rod 81, so that the front end recess 18 of the first limiting rod 81 hooks the first connecting shaft 13, so that the first neutral pole moving contact is in the closing state. When the transfer switch is switched from the normal power supply to the backup power supply, the main operating mechanism of the first contact assembly drives the first phase pole moving contact to open. At this time, since the first limiting rod 81 hooks the first connecting shaft 13, the first neutral pole moving contact 31 is still in the closing state. At this time, the backup operating mechanism of the second contact assembly drives the second neutral pole moving contact 31′ and the second-phase moving contact are closed. During the closing process, the standby operating mechanism pushes the second push rod 82′ to slide in the first bracket 10 through the second limit piece 81′. When the standby side moving contact and the standby side static contact just come into contact, the first push rod 82 slides in the second bracket 10′ and pushes the second limit rod 81′ to compress the compression spring. The second limit rod 81′ rotates around the fulcrum, and the front end of the second limit rod 81′ rises and releases the first neutral pole cantilever 14. The first neutral pole cantilever 14 rotates under the pulling force of the first reset spring 16 to realize neutral pole opening. The main shaft of the standby operating mechanism continues to rotate until the second contact assembly is completely closed, thereby realizing neutral pole overlap.

[0033] Similarly, when the transfer switch switches from the backup power supply to the normal power supply, the principle is similar.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be considered as the scope of protection of the present invention.

Claims

1. An automatic transfer switch with a neutral line overlap function, characterized in that: The first contact assembly and the second contact assembly are mounted on the housing relative to each other, the first contact assembly connects the main power supply and the load, and the second contact assembly connects the backup power supply and the load; The first contact assembly includes: a first static contact, a main operating mechanism and a first moving contact, and the first static contact, the main operating mechanism and the first moving contact are all installed on the housing; The second contact assembly includes: a second static contact, a backup operating mechanism and a second moving contact, wherein the second static contact, the backup operating mechanism and the second moving contact are all mounted on the housing; It also includes a limit assembly, which is located on the upper part of the first moving contact and the second moving contact, and one end of the limit assembly is fixed on the main shaft of the main operating mechanism and the main shaft of the backup operating mechanism, and the other end of the limit assembly is respectively connected to the first moving contact and the second moving contact. The limit assembly is used to realize the length of time that the neutral pole overlaps.

2. The automatic transfer switch with neutral line overlap function according to claim 1, characterized in that: The limiting assembly includes a first limiting assembly and a second limiting assembly, one end of the first limiting assembly is fixedly mounted on the main shaft of the main operating mechanism, and the other end of the first limiting assembly is mounted on the bracket assembly, one end of the second limiting assembly is fixedly mounted on the main shaft of the backup operating mechanism, and the other end of the second limiting assembly is fixedly mounted on the bracket assembly.

3. The automatic transfer switch with neutral line overlap function according to claim 2, characterized in that: The bracket assembly comprises a first bracket and a second bracket, wherein the first bracket and the second bracket are arranged in parallel, and both the first bracket and the second bracket are provided with a U-shaped groove.

4. The automatic transfer switch with neutral line overlap function according to claim 3, characterized in that: A sliding groove is further provided on the side walls of the first bracket and the second bracket that are relatively far away from each other, and a compression spring is provided in the sliding groove.

5. The automatic transfer switch with neutral line overlap function according to claim 4, characterized in that: The slide groove includes a horizontal groove and a vertical groove. The upper end of the vertical groove is connected to one end of the vertical groove. The vertical groove is connected to the horizontal groove. The compression spring is located in the vertical groove, and the lower end of the compression spring is fixed to the lower end of the vertical groove.

6. The automatic transfer switch with neutral line overlap function according to claim 2, characterized in that: The first limiting assembly includes a first limiting rod and a first push rod, one end of the first limiting rod is rotatably connected to one end of the first bracket, the other end of the first limiting rod is connected to a first connecting shaft provided on the main shaft of the main operating mechanism, the end of the first limiting rod close to the first connecting shaft can hook the first connecting shaft or tilt, one end of the first push rod is connected to one end of the second bracket in a sliding manner, and the other end of the first push rod is fixed to the main shaft of the main operating mechanism through a first limiting member; The second limiting assembly includes a second limiting rod and a second push rod, one end of the second limiting rod is rotatably connected to one end of the second bracket, the other end of the second limiting rod is connected to a second connecting shaft provided on the main shaft of the backup operating mechanism, the end of the second limiting rod close to the second connecting shaft can hook the second connecting shaft or tilt, one end of the second push rod is connected to one end of the first bracket in a sliding manner, and the other end of the second push rod is fixed to the main shaft of the backup operating mechanism through a second limiting member; The main operating mechanism main shaft is further provided with a plurality of first neutral pole cantilevers, which are rotatably connected to the first moving contact; the backup operating mechanism main shaft is further provided with a plurality of second neutral pole cantilevers, which are rotatably connected to the second moving contact.

7. The automatic transfer switch with neutral line overlap function according to claim 6, characterized in that: The first connecting shaft is fixed to the main shaft of the main operating mechanism through two first fixing plates, wherein a gap is provided between the two first fixing plates, one end of the two first fixing plates close to the main shaft of the main operating mechanism is connected to the main shaft of the main operating mechanism, and both ends of the first connecting shaft are connected to the upper ends of the two first fixing plates. A first return spring is further provided at one end of the two first fixing plates away from the bracket, one end of the first return spring is fixed to the two first fixing plates, and the other end of the first return spring is fixed to the base through a first fixing member; The second connecting shaft is fixed to the standby operating mechanism main shaft row through two second fixing plates, wherein a gap is provided between the two second fixing plates, and one end of the two second fixing plates close to the standby operating mechanism main shaft is connected to the standby operating mechanism main shaft, and both ends of the second connecting shaft are connected to the upper ends of the two second fixing plates. A second return spring is also provided at one end of the two second fixing plates away from the bracket, and one end of the second return spring is fixed to the two second fixing plates, and the other end of the second return spring is fixed to the base through a second fixing piece.

8. The automatic transfer switch with neutral line overlap function according to claim 7, characterized in that: The first limiting rod and the second limiting rod are respectively provided with a recessed portion on one side close to the first connecting shaft and the second connecting shaft, and the recessed portion extends toward an end away from the first connecting shaft and the second connecting shaft.

9. The automatic transfer switch with neutral line overlap function according to claim 1, characterized in that: The first moving contact includes a first neutral pole moving contact and a first phase pole moving contact, the first phase pole moving contact and the first neutral pole moving contact are installed in parallel and close to one side of the limit assembly, and one end of the first neutral pole moving contact and the first phase pole moving contact are rotatably mounted on the housing through a moving contact mounting plate; The second moving contact includes a second neutral pole moving contact and a second phase pole moving contact. The second phase pole moving contact and the second neutral pole moving contact are installed in parallel and close to one side of the limit assembly. One end of the second neutral pole moving contact and the second phase pole moving contact are rotatably installed on the shell through a moving contact mounting plate shell.

10. The automatic transfer switch with neutral line overlap function according to claim 1, characterized in that: The first static contact includes: a first neutral pole static contact and a first phase pole static contact, the first neutral pole static contact and the first phase pole static contact are arranged in parallel, and the first neutral pole static contact is arranged correspondingly to the first neutral moving contact, and the first phase pole static contact is arranged correspondingly to the first phase pole moving contact; The second static contact includes: a second neutral pole static contact and a second phase pole static contact. The second neutral pole static contact and the second phase pole static contact are arranged in parallel, and the second neutral pole static contact is arranged correspondingly to the second neutral moving contact, and the second phase pole static contact is arranged correspondingly to the second phase pole moving contact.

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