Contact system of dual-power automatic change-over switch

Abstract

The invention discloses a contact system of a dual-power automatic change-over switch. The contact system comprises a shell, a driving shaft, a rotary pressing plate, a conductive seat, a moving contact, a load terminal, a first static contact and a second static contact, the driving shaft is rotationally installed on the shell, the rotating pressing plate fixedly sleeves the driving shaft, a connecting groove is formed in the front side of the conductive base, the middle of the moving contact is rotationally installed in the connecting groove through a rotating shaft, two first springs are connected between the moving contact and the rotating pressing plate, and the middle of the moving contact is of a circular structure. The upper and lower ends and the rear side of the circular structure are respectively electrically contacted with the upper and lower groove walls and the side wall of the connecting groove, and the load terminal is electrically contacted with the conductive seat. According to the contact system of the dual-power-supply automatic change-over switch, the moving contact is electrically contacted with the connecting groove of the conductive seat through the circular structure so as to realize conduction with the load terminal, a wire does not need to be additionally arranged, the structure is simplified, and the reliability is improved. Moreover, the pressing plate can be rotated to apply a pre-tightening force to the moving contact through the first spring, so that the moving contact is kept in close contact with the static contact.

Description

Technical Field

[0001] This invention relates to a contact system for a dual-power automatic transfer switch. Background Technology

[0002] Dual power automatic transfer switches are used to automatically switch to backup power when the main power supply fails, ensuring continuous power supply to the load.

[0003] Existing changeover switches mostly use wires to connect the moving contact to the load terminal, resulting in a complex structure, poor contact reliability, and a tendency to generate electric arcs during switching, affecting electrical life and safety. Furthermore, poor contact between the moving and stationary contacts often occurs due to manufacturing errors or vibration.

[0004] Therefore, it is necessary to design corresponding technical solutions to solve the above problems. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, the present invention provides a contact system for a dual-power automatic transfer switch to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution of the present invention is to design a contact system for a dual-power automatic transfer switch; comprising a housing, a drive shaft, a rotating pressure plate, a conductive base, a moving contact, a load terminal, a first stationary contact, and a second stationary contact; the housing is provided with an arc-shaped groove, the drive shaft passes through the arc-shaped groove and is rotatable along the arc-shaped groove, the middle part of the rotating pressure plate is fixedly fitted onto the drive shaft, the conductive base is fixedly installed on the housing, and the front side of the conductive base is provided with a connecting groove, the middle part of the moving contact is rotatably installed in the connecting groove via a rotating shaft, and the bottom two ends of the moving contact are respectively provided with a first moving contact and a second moving contact. The moving contact has two first springs connected between its top and the bottom of the rotating pressure plate. The two first springs are located on both sides of the conductive base. The middle part of the moving contact is a circular structure. The upper and lower ends and the rear side of the circular structure are electrically in contact with the upper and lower groove walls and the side walls of the connecting groove, respectively. The load terminal, the first stationary contact and the second stationary contact are fixedly installed in the housing. The top of the load terminal is electrically in contact with the bottom of the conductive base. The top of the first stationary contact is provided with a first stationary contact corresponding to the first moving contact. The top of the second stationary contact is provided with a second stationary contact corresponding to the second moving contact.

[0007] Preferably, a fixing plate is provided at the opening of the connecting groove, the fixing plate is located on the front side of the circular structure, and a second spring abuts between the fixing plate and the circular structure.

[0008] Preferably, the bottom of the rotating pressure plate is provided with two first mounting holes symmetrically, and the top of the moving contact is provided with two second mounting holes corresponding to the first mounting holes. The two ends of the first spring are respectively fixed in the corresponding first mounting holes and second mounting holes.

[0009] Preferably, the contact system of the dual power supply automatic transfer switch further includes an insulating plate and a toggle member. The insulating plate is slidably installed on the housing and is sleeved on the outside of the conductive base through a clearance groove. The clearance groove has a slot on its wall and a slot at the bottom of the rotating pressure plate. The toggle member is rotatably mounted on the rotating shaft. The top of the toggle member extends into the slot and the bottom of the toggle member has a locking block that engages with the slot.

[0010] Preferably, the insulating board is made of melamine.

[0011] The advantages and beneficial effects of this invention are as follows: It provides a contact system for a dual-power automatic transfer switch, which has a reasonable structure. The moving contact achieves electrical contact with the load terminal through a circular structure and the connecting groove of the conductive base, eliminating the need for additional wires, simplifying the structure and improving reliability. Furthermore, the rotating pressure plate can apply a preload force to the moving contact through a first spring, maintaining close contact between the moving contact and the corresponding stationary contact. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention.

[0013] Figure 2 This is a schematic diagram of the installation structure of the drive shaft in this invention.

[0014] Figure 3 This is a schematic diagram of the mounting structure of the moving contact in this invention.

[0015] Figure 4 This is a schematic diagram of the mounting structure of the first spring in this invention.

[0016] Figure 5 This is a schematic diagram of the mounting structure of the fixing plate in this invention.

[0017] Figure 6 This is a schematic diagram of the insulating plate in this invention. Detailed Implementation

[0018] 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.

[0019] The specific technical solution of this invention is as follows: In one specific embodiment, such as Figure 1 , Figure 2 and Figure 3As shown, a contact system for a dual-power automatic transfer switch includes a housing 1, a drive shaft 2, a rotating pressure plate 3, a conductive base 4, a moving contact 5, a load terminal 6, a first stationary contact 7, and a second stationary contact 8. The housing 1 has an arc-shaped groove 9, through which the drive shaft 2 passes and is rotatable. The middle portion of the rotating pressure plate 3 is fixedly fitted onto the drive shaft 2. The conductive base 4 is fixedly installed on the housing 1, and a connecting groove 10 is provided on the front side of the conductive base 4. The middle portion of the moving contact 5 is rotatably installed in the connecting groove 10 via a rotating shaft 11. The bottom ends of the moving contact 5 are respectively provided with a first moving contact 12 and a second moving contact 13. Two first springs 14 are connected between the top of the contact 5 and the bottom of the rotating pressure plate 3. The two first springs 14 are located on both sides of the conductive base 4. The middle part of the moving contact 5 is a circular structure 15. The upper and lower ends and the rear side of the circular structure 15 are in electrical contact with the upper and lower groove walls and the side walls of the connecting groove 10, respectively. The load terminal 6, the first stationary contact 7 and the second stationary contact 8 are fixedly installed on the housing 1. The top of the load terminal 6 is in electrical contact with the bottom of the conductive base 4. The top of the first stationary contact 7 is provided with a first stationary contact 16 corresponding to the first moving contact 12. The top of the second stationary contact 8 is provided with a second stationary contact 17 corresponding to the second moving contact 13.

[0020] The working principle of the contact system of the dual power supply automatic transfer switch of the present invention is as follows: the drive shaft 2 drives the rotating pressure plate 3 to rotate, and the rotating pressure plate 3 drives the moving contact 5 to rotate between the first position and the second position. When the moving contact 5 rotates to the first position, the first moving contact 12 and the first stationary contact 16 are closed, and the first power supply supplies power to the load. When the moving contact 5 rotates to the second position, the second moving contact 13 and the second stationary contact 17 are closed, and the second power supply supplies power to the load.

[0021] In this invention, the moving contact 5 achieves electrical contact with the load terminal through the circular structure 15 and the connecting groove 10 of the conductive base 4, eliminating the need for additional wires, simplifying the structure and improving reliability.

[0022] In this invention, when the moving contact 5 rotates to its position, the rotating pressure plate 3 presses down on the moving contact 5, and the first spring 14 applies a preload force to the moving contact 5 to maintain close contact between the moving contact 5 and the corresponding stationary contact. Furthermore, in some existing structures, the moving contact 5 is directly driven to rotate by the drive shaft 2. After long-term use, the drive shaft 2 may wear or deform, leading to a decrease in coaxiality and causing the moving contact to shift position, affecting contact stability. In this invention, the moving contact 5 is installed inside the connecting groove 10 of the conductive base 4 via a rotating shaft 11. The rotating shaft 11 only provides rotational support for the moving contact 5 and does not act as a force-applying component. The drive shaft 2 is the active component, indirectly driving the moving contact 5 to rotate via the rotating pressure plate 3. The rotating pressure plate 3 ensures that even when the coaxiality of the drive shaft 2 changes due to long-term use, the rotation trajectory of the moving contact 5 remains stable, preventing positional shift and ensuring reliable contact between the moving contact 5 and the stationary contact.

[0023] In another specific embodiment, such as Figure 1 , Figure 3 and Figure 5 As shown, a fixing plate 18 is provided at the opening of the connecting groove 10. The fixing plate 18 is located on the front side of the circular structure 15, and a second spring abuts between the fixing plate 18 and the circular structure 15.

[0024] By adopting the above solution, the circular structure 15 of the moving contact 5 can be tightly pressed against the side wall of the connecting groove 4 by the elastic force of the second spring, ensuring good electrical contact. A groove for accommodating the second spring can be formed on the front side of the circular structure 15.

[0025] In another specific embodiment, such as Figure 1 and Figure 4 As shown, the bottom of the rotating pressure plate 3 is symmetrically provided with two first mounting holes 19, and the top of the moving contact 5 is provided with two second mounting holes corresponding to the first mounting holes 19. The two ends of the first spring 14 are respectively fixed in the corresponding first mounting holes 19 and second mounting holes.

[0026] The above solution is adopted to achieve a secure installation of the first spring 14.

[0027] In another specific embodiment, such as Figure 1 and Figure 6 As shown, the contact system of the dual power supply automatic transfer switch also includes an insulating plate 20 and a toggle member 21. The insulating plate 20 is slidably installed on the housing 1, and the insulating plate 20 is sleeved on the outside of the conductive base 4 through the clearance groove 22. The clearance groove 22 has a slot 23 on its groove wall. The bottom of the rotating pressure plate 3 has a slot 24. The toggle member 21 is rotatably fitted on the rotating shaft 11. The top of the toggle member 21 extends into the slot 24, and the bottom of the toggle member 21 has a locking block 25 that engages with the slot 23.

[0028] The above solution is adopted: when the rotating pressure plate 3 rotates, it can drive the actuating member 21 to rotate through the slot 24, so that the actuating member 21 drives the insulating plate 20 to move horizontally through the cooperation of the locking block 25 and the locking slot 23; when the first moving contact 12 and the first stationary contact 16 are closed, the insulating plate 20 moves horizontally between the second moving contact 13 and the second stationary contact 17; when the second moving contact 13 and the second stationary contact 17 are closed, the insulating plate 20 moves horizontally between the first moving contact 12 and the first stationary contact 16, which plays the role of isolating the electric arc.

[0029] In another specific embodiment, the insulating board 20 is made of melamine.

[0030] The above solution enables the insulating board 20 to have good insulation and arc resistance properties.

[0031] 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 contact system for a dual-power automatic transfer switch, characterized in that, The device includes a housing, a drive shaft, a rotating pressure plate, a conductive base, a moving contact, a load terminal, a first stationary contact, and a second stationary contact. The housing has an arc-shaped groove, through which the drive shaft passes and is rotatable. The rotating pressure plate is fixedly fitted onto the drive shaft at its center. The conductive base is fixedly installed on the housing, and its front side has a connecting groove. The moving contact is rotatably mounted in the connecting groove via a rotating shaft. The bottom ends of the moving contact have a first moving contact and a second moving contact, respectively. The top of the moving contact and the rotating pressure plate... Two first springs are connected at the bottom, and the two first springs are located on both sides of the conductive base. The middle part of the moving contact is a circular structure. The upper and lower ends and the rear side of the circular structure are in electrical contact with the upper and lower groove walls and the side walls of the connecting groove, respectively. The load terminal, the first stationary contact and the second stationary contact are fixedly installed in the housing. The top of the load terminal is in electrical contact with the bottom of the conductive base. The top of the first stationary contact is provided with a first stationary contact corresponding to the first moving contact. The top of the second stationary contact is provided with a second stationary contact corresponding to the second moving contact.

2. The contact system of the dual-power automatic transfer switch according to claim 1, characterized in that, A fixing plate is provided at the opening of the connecting groove. The fixing plate is located on the front side of the circular structure, and a second spring abuts between the fixing plate and the circular structure.

3. The contact system of the dual-power automatic transfer switch according to claim 1, characterized in that, The bottom of the rotating pressure plate is symmetrically provided with two first mounting holes, and the top of the moving contact is provided with two second mounting holes that correspond one-to-one with the first mounting holes. The two ends of the first spring are respectively fixed in the corresponding first mounting holes and second mounting holes.

4. The contact system of the dual-power automatic transfer switch according to claim 1, characterized in that, The contact system of the dual power supply automatic transfer switch also includes an insulating plate and a toggle member. The insulating plate is slidably installed on the housing and is sleeved on the outside of the conductive base through a clearance groove. The clearance groove has a slot on its wall and a slot at the bottom of the rotating pressure plate. The toggle member is rotatably mounted on the rotating shaft. The top of the toggle member extends into the slot and the bottom of the toggle member has a locking block that engages with the slot.

5. The contact system of the dual-power automatic transfer switch according to claim 4, characterized in that, The insulating board is made of melamine.

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