Contact mechanism of a dual power transfer switch

Abstract

This utility model discloses a contact mechanism for a dual-power transfer switch, including a housing, and one moving contact and two stationary contacts disposed within the housing. The moving contact rotates to close and open with the two stationary contacts. The moving contact includes a rotating arm and a moving contact plate disposed on the rotating arm. Both the moving contact plate and the stationary contacts are vertically plate-shaped. When the rotating arm rotates and drives the moving contact plate to close with the stationary contacts, the sides of the moving contact plate and the stationary contacts continuously abut against each other for engagement. When the moving contact plate and the stationary contacts of this utility model rotate to close, their vertically plate-shaped structure allows for side-to-side contact engagement, resulting in better closing stability compared to the traditional face-to-face contact closing method, ensuring normal closing and energizing of the dual-power transfer switch.

Description

Technical Field

[0001] This utility model relates to the field of electrical switches, and in particular to a contact mechanism for a dual power supply transfer switch. Background Technology

[0002] In a dual-power transfer switch, the contact system is a key structure. The movement of the moving contact switches between the main power supply and the backup power supply by interacting with two stationary contacts. Traditionally, the moving and stationary contacts close face-to-face, relying on the pressure of the moving contact to ensure stable closure. However, if the mechanical structure loosens, abnormal opening may occur, affecting the normal operation of the dual-power transfer switch. This invention aims to design a structure that coordinates the moving and stationary contacts to solve the aforementioned problems. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a contact mechanism for a dual power transfer switch. Through the vertical moving contact piece and stationary contact, the two make face-to-face contact from the side when closing, thereby realizing the closing. This ensures the stability of closing and guarantees the normal operation of the dual power transfer switch.

[0004] The present invention adopts the following technical solution: a contact mechanism for a dual power supply changeover switch, including a housing, and a moving contact and two stationary contacts disposed in the housing. The moving contact is rotated to close and open with the stationary contacts on both sides. The moving contact includes a rotating arm and a moving contact plate disposed on the rotating arm. Both the moving contact plate and the stationary contacts are vertical plate-shaped. When the rotating arm rotates and drives the moving contact plate to close with the stationary contacts, the sides of the moving contact plate and the stationary contacts continuously abut against each other to cooperate.

[0005] As an improvement, the moving contact piece is configured with two pieces at the front, with the two moving contact pieces spaced apart. When the rotating arm rotates and drives the moving contact piece to close the circuit with the stationary contact, the stationary contact is clamped between the two moving contact pieces.

[0006] As an improvement, the two moving contact pieces are arranged at an angle relative to each other, so that the distance between the two moving contact pieces gradually decreases from the near end to the far end.

[0007] As an improvement, the two moving contact pieces are staggered in the rotation direction of the rotating arm, so that the two moving contact pieces come into contact or separate sequentially when they rotate to or away from the stationary contacts on both sides.

[0008] As an improvement, the front of the rotating arm has two mounting holes, and two moving contact plates are respectively set in the two mounting holes.

[0009] As an improvement, an elastic pressure plate is provided in the mounting hole. The elastic pressure plate is located on the outside of the moving contact piece, thereby causing the two moving contact pieces to abut against each other.

[0010] As an improvement, a mounting shaft is transversely inserted through the rotating arm, passing through the elastic pressure plate and the moving contact plate, and is then integrated with the rotating arm.

[0011] As an improvement, the rear part of the moving contact piece extends outward from the side of the mounting hole to form a connecting piece.

[0012] As an improvement, the front end of the rotating arm extends to both sides to form an arc-shaped stop.

[0013] The beneficial effects of this utility model are as follows: When the moving contact and the stationary contact rotate to close the circuit, they are engaged in face-to-face contact through the vertical plate structure. Compared with the traditional face-to-face closing method, this method has better closing stability and ensures the normal closing and energizing of the dual power supply transfer switch. Attached Figure Description

[0014] Figure 1 This is a partial three-dimensional structural diagram of the dual power supply transfer switch of this utility model after the outer casing is hidden.

[0015] Figure 2 This is a three-dimensional structural diagram of the moving contact of this utility model. Figure 1 .

[0016] Figure 3 This is a three-dimensional structural diagram of the moving contact of this utility model. Figure 2 .

[0017] Figure 4 This is a longitudinal sectional view of the moving contact of this utility model. Detailed Implementation

[0018] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 , 2 Figures 3 and 4 show a specific embodiment of the contact mechanism of the dual-power transfer switch of this utility model. This embodiment includes a housing 1, and a moving contact 2 and two stationary contacts 3 disposed in the housing 1. The moving contact 1 rotates to close and open with the stationary contacts 3 on both sides. The moving contact 2 includes a rotating arm 21 and a moving contact plate 22 disposed on the rotating arm 21. Both the moving contact plate 22 and the stationary contacts 3 are vertical plates. When the rotating arm 21 rotates and drives the moving contact plate 22 to close with the stationary contacts 3, the sides of the moving contact plate 22 and the stationary contacts 3 continuously abut against each other to cooperate.

[0020] In use, the rotating arm 21 has a rotating hole 20 at its rear for a drive shaft to pass through. This drive shaft is connected to the opening and closing operating mechanism, which drives the rotating arm 21 to rotate when switching is required. This causes the moving contact piece 22 to close and open with the stationary contacts 3 on both sides. The moving contact piece 22 rotates to reach the side of the stationary contact 3 and, through its own elasticity, makes lateral contact with the stationary contact 3, thus achieving a stable closing state. This vertical, plate-like engagement ensures that the moving contact piece 22 and the stationary contact 3 maintain a continuous contact position relative to the rotation stroke of the rotating arm 21. Even if the rotating arm 21 and the moving contact piece 22 experience slight changes in rotational position, it will not affect the closing state, thus ensuring the stability of the closing operation.

[0021] As an improved specific implementation, the moving contact piece 22 is configured with two pieces at the front of the moving contact piece 22, and the two moving contact pieces 22 are arranged at intervals. When the rotating arm 21 rotates and drives the moving contact piece 22 to close the circuit to the stationary contact 3, the stationary contact 3 is clamped between the two moving contact pieces 22.

[0022] like Figure 1-4 As shown, as an optimization of the structure, the moving contact piece 22 is set as two vertical pieces on the left and right, forming a clamping space between the two moving contact pieces 22. During closing, the stationary contact 3 enters the clamping space, and the two moving contact pieces 22 achieve a more stable clamping fit on the stationary contact 3, thereby further improving the stability of closing. In specific implementation, the size of the clamping space can be set smaller than the size of the stationary contact 3. When the two moving contact pieces 22 rotate to both sides of the stationary contact 3 to accommodate the stationary contact 3 into the clamping space, the stationary contact 3 abuts against the moving contact pieces 22 to the sides, thus making the contact state, i.e., the closing state, more stable.

[0023] As an improved specific implementation, the two moving contact pieces 22 are arranged at an angle relative to each other, thereby causing the distance between the two moving contact pieces 22 to gradually decrease from the near end to the far end.

[0024] like Figure 4 As shown, the near end is the end close to the rotating arm 21, and the far end is the open end far from the rotating arm 21. The size of the far end gradually decreases, so that the two moving contact pieces 22 maintain a good closed state. When cooperating with the stationary contact 3, the two moving contact pieces 22 are pushed outward to achieve a good contact closing state.

[0025] As an improved specific implementation, the two moving contact pieces 22 are staggered in the rotation direction of the rotating arm 21, so that the two moving contact pieces 22 contact or separate sequentially when rotating to or away from the stationary contacts 3 on both sides.

[0026] like Figure 1 , 2As shown, when the moving contact piece 22 is closed or opened with the stationary contact 3, a temperature rise or an electric arc will occur. The staggered arrangement of the two moving contact pieces 22 ensures that, whether closing or opening, only one moving contact piece 22 first contacts or separates from the stationary contact 3 through rotation. This ensures that the temperature rise or electric arc occurs only on one moving contact piece 22, thus avoiding simultaneous damage to both moving contact pieces 22 in the event of simultaneous contact. In actual use, even if one moving contact piece 22 is accidentally burned, the other moving contact piece 22 can maintain the working state of the contact mechanism. Afterwards, the staff can promptly troubleshoot and repair the fault and adjust the equipment according to the actual working conditions.

[0027] As an improved specific implementation, the front part of the rotating arm 21 has two mounting holes 23, and two moving contact pieces 22 are respectively disposed in the two mounting holes 22.

[0028] like Figure 1-4 As shown, the two moving contact pieces 22 are installed in the two mounting holes 23 on the left and right. The distance between the two moving contact pieces 22 is limited by the distance between the two mounting holes 23. The front part of the moving contact piece 22 extends out of the mounting hole 23 and forms a clamping space. The extended part can be deformed to adapt to the cooperation with the stationary contact 3.

[0029] As an improved specific implementation, an elastic pressure plate 24 is provided in the mounting hole 23. The elastic pressure plate 24 is located on the outside of the moving contact piece 22, thereby causing the two moving contact pieces 22 to abut against each other.

[0030] like Figure 1-4 As shown, the elastic pressure plate 24 and the moving contact piece 22 are both accommodated in the mounting hole 23. The elastic pressure plate 24 abuts against the moving contact piece 22 from the outside, thereby effectively limiting the moving contact piece 22. The front part of the elastic pressure plate 24 extends out of the mounting hole 23 and abuts against the outside of the moving contact piece 22, thereby keeping the front ends of the two moving contact pieces 22 in a relatively inclined structural state, ensuring better clamping and closing with the stationary contact 3.

[0031] As an improved specific implementation, a mounting shaft 25 is transversely inserted through the rotating arm 21. The mounting shaft 25 passes through the elastic pressure plate 24 and the moving contact plate 22 and is then installed as a whole with the rotating arm 21.

[0032] like Figure 1-4 As shown, the elastic pressure plate 24 and the moving contact plate 22 are structurally installed by a mounting shaft 25 that passes through the rotating arm 21. The structure is simple and easy to process and manufacture. The mounting shaft 25 can be installed and locked on the rotating arm 21 by conventional fasteners.

[0033] As an improved specific implementation, the rear part of the moving contact piece 22 extends outward from the side of the mounting hole 23 to form a connecting piece 26.

[0034] like Figure 1 As shown, the connecting piece 26 extends from the rear, making it easy to connect to the extension frame 11 of the housing 1 via a flexible connection such as a wire, and the extension frame 11 connects to the external wiring.

[0035] As an improved specific implementation, the front end of the rotating arm 21 extends to both sides to form an arc-shaped stop surface 27.

[0036] like Figure 1 , 2 As shown in Figure 3, the moving contact 22 and the stationary contact 3 will generate an electric arc when the circuit is opened. The arc-shaped baffles 27 set on both sides of the front end of the rotating arm 21 can block the position of the stationary contacts 3 when the circuit is opened, thereby preventing the electric arc and airflow from flowing to the arc extinguishing chamber. This allows the electric arc to be better guided into the arc extinguishing chamber to complete the arc extinguishing, thus improving the safety of the dual power supply transfer switch opening.

[0037] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A contact mechanism for a dual-power transfer switch, comprising a housing (1), and a moving contact (2) and two stationary contacts (3) disposed in the housing (1), wherein the moving contact (2) performs closing and opening with the stationary contacts (3) on both sides by rotation, characterized in that: The moving contact (2) includes a rotating arm (21) and a moving contact piece (22) disposed on the rotating arm (21). Both the moving contact piece (22) and the stationary contact (3) are vertical plates. When the rotating arm (21) rotates and drives the moving contact piece (22) to close the circuit to the stationary contact (3), the sides of the moving contact piece (22) and the stationary contact (3) continuously abut against each other to cooperate.

2. The contact mechanism of a dual power supply changeover switch according to claim 1, characterized in that: The moving contact piece (22) is configured as two pieces at the front of the moving contact piece (22), and the two moving contact pieces (22) are spaced apart. When the rotating arm (21) rotates and drives the moving contact piece (22) to close the circuit to the stationary contact (3), the stationary contact (3) is clamped between the two moving contact pieces (22).

3. The contact mechanism of a dual power supply changeover switch according to claim 2, characterized in that: The two moving contact pieces (22) are arranged at an angle relative to each other, thereby causing the distance between the two moving contact pieces (22) to gradually decrease from the near end to the far end.

4. The contact mechanism of a dual power supply changeover switch according to claim 2, characterized in that: The two moving contact pieces (22) are staggered in the rotation direction of the rotating arm (21), so that the two moving contact pieces (22) will contact or separate one after the other when they rotate to reach or leave the stationary contacts (3) on both sides.

5. The contact mechanism of a dual power supply changeover switch according to claim 2, 3, or 4, characterized in that: The front part of the rotating arm (21) has two mounting holes (23), and two moving contact pieces (22) are respectively disposed in the two mounting holes (22).

6. The contact mechanism of a dual power supply changeover switch according to claim 5, characterized in that: An elastic pressure plate (24) is provided in the mounting hole (23). The elastic pressure plate (24) is located on the outside of the moving contact piece (22), thereby causing the two moving contact pieces (22) to abut against each other.

7. The contact mechanism of a dual power supply changeover switch according to claim 6, characterized in that: A mounting shaft (25) is transversely inserted through the rotating arm (21). The mounting shaft (25) passes through the elastic pressure plate (24) and the moving contact plate (22) and is then installed as a whole with the rotating arm (21).

8. The contact mechanism of a dual power supply changeover switch according to claim 5, characterized in that: The rear part of the moving contact piece (22) extends outward from the side of the mounting hole (23) to form a connecting piece (26).

9. The contact mechanism of a dual power supply changeover switch according to claim 1, 2, 3, or 4, characterized in that: The front end of the rotating arm (21) extends to both sides to form an arc-shaped stop (27).

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