A neutral overlap mechanism for a dual power transfer switch

Abstract

The application discloses a neutral line overlapping mechanism for a double power transfer switch, which comprises a neutral pole switch group, wherein the neutral pole switch group comprises a normal side moving contact, a normal side static contact, a standby side moving contact, a standby side static contact, a mounting frame, a transmission plate, a normal side strip ring, a standby side strip ring, a normal side spring, a standby side spring, a normal side swing piece and a standby side swing piece; the transmission plate is hinged to the mounting frame; the top surface of the transmission plate comprises a normal side abutting surface and a standby side abutting surface; the normal side moving contact is connected to the transmission plate through the normal side strip ring, and the normal side moving contact is connected to the normal side spring; the standby side moving contact is connected to the transmission plate through the standby side strip ring, and the standby side moving contact is connected to the standby side spring; the normal side swing piece can abut against the normal side abutting surface; and the standby side swing piece can abut against the standby side abutting surface. The neutral line overlapping mechanism for the double power transfer switch can avoid the problem of neutral line vacancy.

Description

Technical Field

[0001] This invention relates to a neutral line overlap mechanism for a dual power supply transfer switch. Background Technology

[0002] Dual power switches are widely used in various locations requiring uninterrupted power supply. They enable automatic switching of the load line between two power sources to ensure the reliability of power supply to users. A dual power switch consists of a phase switch group and a neutral switch group, both with a primary power supply side and a backup power supply side. During normal operation, the primary power supply side is closed to provide power. When a fault such as a short circuit occurs on the primary power supply side, the dual power switch will trip to the backup power supply side to ensure normal power supply. However, during the power switching process, the neutral line, like other phase lines, experiences a temporary disconnection. This will cause voltage fluctuations in some electrical equipment, resulting in impacts and losses. Therefore, corresponding technical solutions need to be designed to address these technical problems. Summary of the Invention

[0003] The purpose of this invention is to provide a neutral line overlap mechanism for a dual power supply transfer switch. Its structure is reasonable, which can avoid the problem of the neutral line being empty during the transfer process of the dual power supply switch, thereby improving the stability and safety of the electrical load operation.

[0004] To achieve the above objectives, the technical solution of the present invention is to design a neutral line overlap mechanism for a dual-power transfer switch, comprising a neutral pole switch group, a phase pole switch group, a normal operating mechanism, and a standby operating mechanism. Both the neutral pole switch group and the phase pole switch group include a normal operating side moving contact, a normal operating side stationary contact, a standby side moving contact, and a standby side stationary contact. The normal operating side moving contact is connected to the normal operating side power supply terminal, and the standby side moving contact is connected to the standby side power supply terminal. The normal operating side stationary contact and the standby side stationary contact are jointly connected to the load terminal. The normal operating mechanism includes a normal operating side switching shaft. When the normal operating side switching shaft rotates, the normal operating side moving contact in the phase pole switch group... The operating mechanism of the neutral pole switch group includes a standby side switching shaft, which switches the standby side moving contact and the standby side stationary contact between the neutral pole and the normal side. The standby side switching mechanism also includes a mounting bracket, a transmission plate, a normal side strip ring, a standby side strip ring, a normal side spring, a standby side spring, a normal side rocker arm, and a standby side rocker arm. The mounting bracket is positioned between the normal side moving contact and the standby side moving contact. The transmission plate is positioned above the normal side moving contact and the standby side moving contact. The middle position of the transmission plate is hinged to the top of the mounting bracket via a pin, and the top surface of the transmission plate includes the normal side... The transmission plate has a common side abutment surface and a spare side abutment surface, located at both ends of the transmission plate. The transmission plate has a common side first pin and a spare side first pin, located on opposite sides of a shaft pin. A common side second pin is located in the middle of the common side moving contact. A common side strip ring is fitted around the outside of the common side first pin and the common side second pin. A common side third pin is located below the common side stationary contact. A common side spring connects between the common side second pin and the common side third pin. A spare side second pin is located in the middle of the spare side moving contact. The spare side strip ring is fitted around the outside of the spare side moving contact. Outside the first and second backup pins on the backup side, a third backup pin is provided below the stationary contact on the backup side. The backup spring is connected between the second and third backup pins on the backup side. The commonly used side swing member is located above the commonly used side contact surface. The commonly used side swing member has a commonly used side square hole, and its bottom end can contact the commonly used side contact surface. The commonly used side conversion square shaft passes through the commonly used side square hole. The backup side swing member is located above the backup side contact surface. The backup side swing member has a backup side square hole, and its bottom end can contact the backup side contact surface. The backup side conversion square shaft passes through the backup side square hole.

[0005] Preferably, both the commonly used side abutment surface and the spare side abutment surface are inclined surfaces.

[0006] Preferably, the neutral pole switch group further includes a housing, and the commonly used side moving contact, the spare side moving contact, the commonly used side swing member, and the spare side swing member are all rotatably connected in the housing.

[0007] Preferably, the top of the load terminal is provided with a bracket, the commonly used stationary contact and the spare stationary contact are disposed on the top of the bracket, and the commonly used third pin and the spare third pin are disposed in the bracket.

[0008] Preferably, the mounting bracket is fixedly connected to the support.

[0009] The advantages and beneficial effects of this invention are as follows: It provides a neutral line overlap mechanism for a dual-power transfer switch, which has a reasonable structure that prevents the neutral line from being unsupported during the switching process, thereby improving the stability and safety of the electrical load. Furthermore, the neutral line overlap mechanism of this invention has the advantages of high reliability, long service life, and low manufacturing cost. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the present invention. Implementation

[0011] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0012] The specific technical solution of this invention is as follows: like Figure 1As shown, a neutral line overlap mechanism for a dual-power transfer switch includes a neutral pole switch group, a phase pole switch group, a normal operating mechanism, and a standby operating mechanism. Both the neutral pole switch group and the phase pole switch group include a normal operating side moving contact 1, a normal operating side stationary contact 2, a standby side moving contact 3, and a standby side stationary contact 4. The normal operating side moving contact 1 is connected to the normal operating side power supply terminal 5, and the standby side moving contact 3 is connected to the standby side power supply terminal 6. The normal operating side stationary contact 2 and the standby side stationary contact 4 are jointly connected to the load terminal 7. The normal operating mechanism includes a normal operating side switching shaft. When the normal operating side switching shaft rotates, the normal operating side moving contact 1 and the normal operating side stationary contact 2 in the phase pole switch group switch between opening and closing. The standby operating mechanism includes... The standby side switching shaft rotates, causing the standby side moving contact 3 and the standby side stationary contact 4 in the phase pole switch group to switch between opening and closing. The neutral pole switch group also includes a mounting bracket 8, a transmission plate 9, a normal side strip ring 10, a standby side strip ring 11, a normal side spring 12, a standby side spring 13, a normal side rocker 14, and a standby side rocker (not shown in the figure). The mounting bracket 8 is positioned between the normal side moving contact 1 and the standby side moving contact 3. The transmission plate 9 is positioned above the normal side moving contact 1 and the standby side moving contact 3. The middle position of the transmission plate 9 is hinged to the top of the mounting bracket 8 by a pin 15, and the top surface of the transmission plate 9 includes a normal side abutment surface 91 and a standby side abutment surface 92. The first and second pins 16 and 92 are respectively located at both ends of the transmission plate 9. The transmission plate 9 is provided with a first pin 16 on the normal side and a first pin 17 on the spare side. The first pin 16 on the normal side and the first pin 17 on the spare side are respectively located on both sides of the shaft pin 15. A second pin 18 on the normal side is provided at the middle position of the moving contact 1 on the normal side. The strip ring 10 on the normal side is fitted on the outside of the first pin 16 and the second pin 18 on the normal side. A third pin 19 on the normal side is provided below the stationary contact 2 on the normal side. The spring 12 on the normal side is connected between the second pin 18 and the third pin 19 on the normal side. A second pin 20 on the spare side is provided at the middle position of the moving contact 3 on the spare side. The strip ring 11 on the spare side is fitted on the first pin 15 on the spare side. Outside the column 17 and the spare side second pin 20, below the spare side stationary contact 4, there is a spare side third pin 21. The spare side spring 13 is connected between the spare side second pin 20 and the spare side third pin 21. The normal side swing member 14 is set above the normal side abutment surface 91. The normal side swing member 14 is provided with a normal side square hole 141, and the bottom end of the normal side swing member 14 can abut against the normal side abutment surface 91. The normal side conversion square shaft passes through the normal side square hole 141. The spare side swing member is set above the spare side abutment surface 92. The spare side swing member is provided with a spare side square hole, and the bottom end of the spare side swing member can abut against the spare side abutment surface 92. The spare side conversion square shaft passes through the spare side square hole.

[0013] Furthermore, both the commonly used side contact surface 91 and the spare side contact surface 92 are inclined surfaces.

[0014] Furthermore, the neutral pole switch assembly also includes a housing 22, and the commonly used side moving contact 1, the spare side moving contact 3, the commonly used side swing member 14, and the spare side swing member are all rotatably connected in the housing 22.

[0015] Furthermore, the top of the load terminal 7 is provided with a bracket 23, the commonly used side stationary contact 2 and the spare side stationary contact 4 are provided on the top of the bracket 23, and the commonly used side third pin 19 and the spare side third pin 21 are provided in the bracket 23.

[0016] Furthermore, the mounting bracket 8 is fixedly connected to the bracket 23.

[0017] The working principle of the neutral line overlap mechanism for a dual power supply transfer switch of the present invention is as follows: When the electrical load is powered by the normal power supply, the normal side moving contact 1 and the normal side stationary contact 2 in the phase switch group are in the closed state. At the same time, the normal side moving contact 1 and the normal side stationary contact 2 in the neutral switch group are in the closed state. At this time, the bottom end of the normal side swing member 14 abuts against the normal side contact surface 91 of the transmission plate 9 and applies downward pressure to the right end of the transmission plate 9, causing the right end of the transmission plate 9 to tilt downward and the left end to tilt upward. At this time, there is a gap between the normal side second pin 18 and the lower end inner wall of the normal side strip ring 10, and the spare side spring 13 is in the stretched state. When the electrical load is switched from being powered by the main power supply to being powered by the backup power supply, the main power supply side switching shaft is first driven to rotate counterclockwise, causing the main power supply side moving contact 1 and the main power supply side stationary contact 2 in the phase switch group to open. At the same time, the main power supply side switching shaft will drive the main power supply side swing member 14 to rotate counterclockwise, causing the main power supply side swing member 14 to gradually separate from the main power supply side contact surface 91. At this time, the backup side moving contact 3 in the neutral pole switch group will rotate under the elastic restoring force of the backup side spring 13 until it closes with the backup side stationary contact 4. At the same time, the backup side moving contact 3 will pull the transmission plate 9 to rotate to a horizontal state through the backup side strip ring 11. Since there is a gap between the main power supply side second pin 18 and the lower inner wall of the main power supply side strip ring 10, the transmission plate 9 will not interfere with the main power supply side second pin 18 and the main power supply side moving contact during the rotation. 1. When a force is applied, the normally used moving contact 1 will remain closed with the normally used stationary contact 2, thus achieving overlap. Then, the standby switching shaft is driven to rotate counterclockwise, causing the standby moving contact 3 and the standby stationary contact 4 in the phase switch group to close. Simultaneously, the standby switching shaft will drive the standby swing member to rotate counterclockwise, causing the bottom end of the standby swing member to contact the standby abutment surface 92, and applying downward pressure to the left end of the transmission plate 9, causing the left end of the transmission plate 9 to tilt downward and the right end to tilt upward. During this process, the transmission plate 9 will pull the normally used moving contact 1 to rotate through the normally used side strip ring 10, causing the normally used moving contact 1 to open with the normally used stationary contact 2. At the same time, the normally used moving contact 1 will stretch the normally used side spring 12 through the normally used side second pin 18, thus completing the power conversion. At this time, the electrical load is powered by the standby power supply. When the dual power transfer switch needs to switch from being powered by the standby power supply to being powered by the normally used power supply, the entire process is the reverse of the above.

[0018] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A neutral line overlap mechanism for a dual-power transfer switch, comprising a neutral pole switch group, a phase pole switch group, a normal operating mechanism, and a standby operating mechanism, wherein both the neutral pole switch group and the phase pole switch group include a normal operating side moving contact, a normal operating side stationary contact, a standby side moving contact, and a standby side stationary contact; the normal operating side moving contact is connected to a normal operating side power supply terminal, the standby side moving contact is connected to a standby side power supply terminal, and the normal operating side stationary contact and the standby side stationary contact are jointly connected to a load terminal; the normal operating mechanism includes a normal operating side switching shaft, which, when rotated, switches the normal operating side moving contact and the normal operating side stationary contact in the phase pole switch group between opening and closing; the standby operating mechanism includes a standby side switching shaft, which, when rotated, switches the standby side moving contact and the standby side stationary contact in the phase pole switch group between opening and closing, characterized in that... The neutral pole switch assembly further includes a mounting bracket, a transmission plate, a service side strip ring, a spare side strip ring, a service side spring, a spare side spring, a service side rocker, and a spare side rocker. The mounting bracket is positioned between the service side moving contact and the spare side moving contact. The transmission plate is positioned above the service side moving contact and the spare side moving contact. The middle position of the transmission plate is hinged to the top of the mounting bracket via a pivot pin. The top surface of the transmission plate includes a service side abutment surface and a spare side abutment surface, which are located at opposite ends of the transmission plate. The transmission plate has a service side first pin and a spare side first pin, which are located on opposite sides of the pivot pin. A service side second pin is located in the middle position of the service side moving contact. The service side strip ring is fitted around the outside of the service side first pin and the service side second pin, below the service side stationary contact. A third pin is provided on the commonly used side, and a spring on the commonly used side is connected between the second and third pins on the commonly used side. A second pin on the spare side is located at the middle position of the spare side moving contact. A spare side strip ring is fitted around the outside of the first and second pins on the spare side. A third pin on the spare side is located below the spare side stationary contact. A spring on the spare side is connected between the second and third pins on the spare side. A swing member on the commonly used side is located above the commonly used side contact surface. The swing member has a square hole on the commonly used side, and its bottom end can contact the commonly used side contact surface. A square shaft on the commonly used side passes through the square hole on the commonly used side. A swing member on the spare side is located above the spare side contact surface. The swing member has a square hole on the spare side, and its bottom end can contact the spare side contact surface. A square shaft on the spare side passes through the square hole on the spare side.

2. The neutral line overlap mechanism for a dual-power transfer switch according to claim 1, characterized in that, Both the commonly used side abutment surface and the spare side abutment surface are inclined surfaces.

3. The neutral line overlap mechanism for a dual-power transfer switch according to claim 1, characterized in that, The neutral pole switch assembly also includes a housing, in which the commonly used side moving contact, the spare side moving contact, the commonly used side swing member, and the spare side swing member are all rotatably connected.

4. The neutral line overlap mechanism for a dual-power transfer switch according to claim 1, characterized in that, The load terminal block is provided with a bracket at the top, the commonly used stationary contact and the spare stationary contact are provided at the top of the bracket, and the commonly used third pin and the spare third pin are provided in the bracket.

5. The neutral line overlap mechanism for a dual-power transfer switch according to claim 4, characterized in that, The mounting bracket is fixedly connected to the support.

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