Dual power automatic switching device of AC contactor plus air switch combination

Abstract

This utility model relates to the field of electrical technology, specifically to a dual-power automatic switching device combining an AC contactor and an air switch. It includes a mounting plate and a protective mechanism. The mounting plate is equipped with a first air switch, a first AC contactor, a second air switch, a second AC contactor, and an outgoing air switch. These components are electrically connected. The protective mechanism includes a frame, wiring holes, a switch door, a fixing block, a square block, a limit block, a long plate, bolts, and a round plate. The frame contacts one side of the mounting plate, the wiring holes are located on the frame, and the switch door is hinged to the front of the frame. This utility model, a dual-power automatic switching device combining an AC contactor and an air switch, solves the problem of poor protection in current equipment.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, specifically to a dual-power automatic switching device combining an AC contactor and an air switch. Background Technology

[0002] As is well known, a dual-power automatic switching device combining an AC contactor and an air switch is an electrical device used in power systems to realize automatic switching between two AC power sources. It mainly solves the problem of power supply interruption caused by power failure (such as power outage or abnormal voltage) and ensures continuous and stable power supply to the load.

[0003] However, existing dual-power automatic transfer devices that use a combination of AC contactors and air switches generally lack effective protective structures. Core electrical components (such as contactors and air switches) are directly exposed to the external environment. This defect makes the device susceptible to collisions with external objects, which may cause problems such as damage to component housings and short circuits, seriously affecting the reliability and service life of the equipment. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a dual-power automatic switching device combining an AC contactor and an air switch.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a dual-power automatic switching device combining an AC contactor and an air switch, comprising a mounting plate and a protective mechanism. The mounting plate is provided with a first air switch, a first AC contactor, a second air switch, a second AC contactor, and an outgoing air switch. The first air switch, the first AC contactor, the second air switch, the second AC contactor, and the outgoing air switch are electrically connected. The protective mechanism includes a frame, wiring holes, and... The system comprises a switch door, a fixing block, a square block, a limiting block, a long plate, bolts, and a round plate. One side of the frame contacts the mounting plate. Wiring holes are formed on the frame. The switch door is hinged to the front of the frame. One end of the square block is fixedly connected to the frame, and the other end of the square block extends into the fixing block. The fixing block has a groove that matches the square block portion. One end of the limiting block extends into the square block, and the other end of the limiting block extends into the fixing block. The long plate is fixedly connected to the fixing block, and the bolts are connected to the long plate. The round plate is fixedly connected to the bolts, and a gap is left between the side wall of the round plate and the limiting block.

[0006] To achieve heat dissipation, the present invention is improved by providing a heat dissipation mesh on the switch door, and the heat dissipation mesh is embedded in the switch door.

[0007] To improve the connection effect, the present invention is improved in that the fixing block is fixedly connected to the mounting plate.

[0008] To improve the strength of the mounting plate, this utility model is improved by using alloy steel as the mounting plate material.

[0009] To facilitate wiring, this utility model is improved by providing several wiring holes.

[0010] To improve the strength of the heat dissipation mesh, this utility model is improved by using stainless steel as the heat dissipation mesh.

[0011] (III) Beneficial Effects Compared with the prior art, this utility model provides a dual-power automatic switching device combining an AC contactor and an air switch, which has the following advantages: This is a dual-power automatic switching device combining an AC contactor and an air switch. The structure uses a closed design of the protective mechanism to cover the first air switch, the first AC contactor, the second air switch, the second AC contactor, and the outgoing air switch on the mounting plate, effectively isolating them from external collisions and significantly reducing the risk of damage to the components caused by external impacts. The frame and mounting plate adopt a modular and detachable design. When the frame or the door needs to be replaced due to long-term use, the entire frame can be quickly disassembled by operating the limit components of the protective mechanism (such as bolts and limit blocks). The door can be replaced at the same time as the frame, which greatly improves maintenance efficiency. New parts can be purchased directly from the manufacturer. The installation process is standardized and does not require complicated operations. In terms of functionality, any two AC contactors of the same specification can be connected by simple electrical wiring (such as coil interlocking and parallel connection of main contacts) to build a dual power supply automatic switching logic, which is compatible with single-phase and three-phase loads and has wide applicability. Compared with commercially available complete dual power supply switching devices, this solution does not require a dedicated control module and achieves the function only through the combination of contactors and air switches, which can reduce the cost by 30%-50%. At the same time, it has the advantages of reliable action response (switching time ≤50ms) and convenient maintenance. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the structure of this utility model; Figure 2 is a partially enlarged structural schematic diagram of point A in Figure 1 of this utility model; Figure 3 is a schematic diagram of the structure of this utility model; Figure 4 is a circuit diagram of this utility model; In the diagram: 1. Mounting plate; 2. First air switch; 3. First AC contactor; 4. Second air switch; 5. Second AC contactor; 6. Outgoing air switch; 7. Protective mechanism; 8. Frame; 9. Wiring hole; 10. Switch door; 11. Heat dissipation mesh; 12. Fixing block; 13. Square block; 14. Limiting block; 15. Long plate; 16. Bolt; 17. Round plate. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please refer to Figures 1-4. A dual-power automatic switching device combining an AC contactor and an air switch includes a mounting plate 1 and a protective mechanism 7. The mounting plate 1 is equipped with a first air switch 2, a first AC contactor 3, a second air switch 4, a second AC contactor 5, and an outgoing air switch 6. The first air switch 2, the first AC contactor 3, the second air switch 4, the second AC contactor 5, and the outgoing air switch 6 are electrically connected. The protective mechanism 7 includes a frame 8, a wiring hole 9, a switch door 10, a fixing block 12, a square block 13, a limiting block 14, a long plate 15, bolts 16, and a circular plate 17. The frame 8 contacts the mounting plate 1 on one side. The wiring hole 9 is opened on the frame 8. The switch door 10 is hinged to the front of the frame 8. One end of the square block 13 is fixedly connected to the frame 8, and the other end of the square block 13 extends into the fixing block 12. The fixing block 12... The upper part has a groove that matches the square block 13. One end of the limiting block 14 extends into the square block 13, and the other end of the limiting block 14 extends into the fixing block 12. The long plate 15 is fixedly connected to the fixing block 12, and the bolt 16 is connected to the long plate 15. The circular plate 17 is fixedly connected to the bolt 16, and a gap is left between the side wall of the circular plate 17 and the limiting block 14. Working principle: During equipment installation, the operator first uses expansion bolts 16 of matching specifications to fix the device to a suitable location such as a distribution cabinet or wall according to the fixing holes on the mounting plate 1. Then, the operator opens the switch door 10. The door lock structure can be a universal rotary lock or padlock; the specific model is not limited here. The external main power supply, backup power supply, and load wires are passed through the wiring holes 9 on the frame 8 respectively. According to the electrical schematic diagram, the wires are connected to the corresponding terminals of the first air switch 2, the first AC contactor 3, the second air switch 4, the second AC contactor 5, and the outgoing air switch 6 in sequence (the main circuit terminals and the control circuit terminals need to be clearly marked). After the wiring is completed, the operator closes the switch door 10 and locks it to ensure the integrity of the protective mechanism 7. Protective Mechanism 7: Functions and Maintenance Logic The protective mechanism 7, through the combined design of the frame 8 and the mounting plate 1, forms a closed protective space, enclosing electrical components such as the first air switch 2, effectively preventing external collisions and accidental contact. (Although the protective mechanism 7 does not have a sealing function, it can effectively prevent external objects from accidentally colliding with electrical components such as the first air switch 2 and the first AC contactor 3 on the mounting plate 1, providing them with a physical protective barrier, reducing the risk of component damage due to external impact, and ensuring the safe operation of the equipment in non-harsh environments.) When the frame 8 or the switch door 10 needs to be replaced due to wear and tear from long-term use, follow these steps: Disassembly process (as shown in Figure 1): Separate the wires from the various electronic components on this structure to ensure that the wires do not interfere with the disassembly process; Turn the bolt 16 counterclockwise to rotate the circular plate 17 upward, so that the position of the circular plate 17 is higher than the position of the limiting block 14 (the distance between the top surfaces of the circular plate 17 and the limiting block 14 is ≥5mm). Pull the limiting block 14 outward in the horizontal direction so that it completely retracts from the mating hole between the block 13 and the fixing block 12; Hold both sides of frame 8 and slowly move it outwards to separate block 13 from the groove of fixed block 12, thus completing the overall disassembly of frame 8. Opening and closing door 10 is removed simultaneously with frame 8. Replacement process: Take the new frame 8 components including the switch door 10, align the block 13 with the groove of the fixing block 12, and slowly push it in until it fits tightly; Insert the limiting block 14 to ensure that it passes through the positioning holes of both the square block 13 and the fixing block 12 simultaneously; Turn bolt 16 clockwise until circular plate 17 descends, making the side of circular plate 17 and limiting block 14 aligned. When limiting block 14 is pulled, limiting block 14 will contact circular plate 17, thus circular plate 17 can be independently limited by limiting block 14, forming a reliable limit (the preload torque of bolt 16 is controlled at 1.0-1.5 N·m). Technical points explained: The edges of wiring hole 9 need to be chamfered (radius ≥ 1mm) to avoid wear on the cable sheath; The replaced protective mechanism 7 must pass the insulation resistance test (≥50MΩ) and protection level verification (IP30) to ensure electrical safety and protection performance. The wiring logic of this device is as follows: The main and backup power supplies are connected to the corresponding first air switch 2 and second air switch 4, respectively. Two control lines are connected from the output side of the first air switch 2 to terminals A1 and A2 of the coil of the first AC contactor 3. Simultaneously, two lines are connected from the output side of the first air switch 2 to the main contact input terminal of the first AC contactor 3. The output line of the first AC contactor 3 is connected to the output air switch 6, and the output side of the output air switch 6 is then connected to the load. One control line is connected from the output side of the second air switch 4 to the normally closed contact of the first AC contactor 3. The output line of the normally closed contact of the first AC contactor 3 is connected to terminal A1 of the coil of the second AC contactor 5. Another control line is connected from the other output terminal of the second air switch 4 to terminal A2 of the coil of the second AC contactor 5. Simultaneously, two lines are connected from the output side of the second air switch 4 to the main contact input terminal of the second AC contactor 5. The output line of the second AC contactor 5 is connected to the input side of the output air switch 6. The output air switch 6... The output side is then connected to a load. Operating principle: When both the first air switch 2 and the second air switch 4 are closed, the first AC contactor 3 is preferentially energized, and power is supplied to the load through the first AC contactor 3. When the first AC contactor 3 is supplying power, if the first power supply suddenly fails, the coil of the first AC contactor 3 is automatically de-energized. The normally closed auxiliary contact of the first AC contactor 3 connects the power supply to the coil of the second AC contactor 5, and the second AC contactor 5 automatically turns on, automatically supplying power to the load. When the main power supply is restored, the second AC contactor 5 automatically disconnects, and the first AC contactor 3 automatically turns on, restoring the main power supply, thus realizing the function of automatic switching between dual power supplies. Note: This dual-power automatic transfer switch operates on a different principle than a complete set of dual-power automatic transfer switches. This device uses an AC contactor as both the detection and actuation element, while the complete set of dual-power automatic transfer switches does not use an AC contactor but instead employs a separate detection module plus an actuation element. To achieve efficient heat dissipation, this embodiment embeds a heat dissipation mesh 11 into the switch door 10. The heat dissipation mesh 11 is made of stainless steel and is precision-machined into a regular mesh structure. It is fixed to the inner wall of the switch door 10 by snap-fit ​​or welding, ensuring a firm embedding without affecting the opening and closing of the switch door 10. This heat dissipation mesh 11 can effectively promote air convection inside the device, reduce the operating temperature of components, and improve the operational stability of the equipment. To improve connection reliability, in this embodiment, the fixing block 12 and the mounting plate 1 are rigidly fixed by welding or bolts 16. By precisely machining the mating surfaces of the fixing block 12 and the mounting plate 1 (flatness ≤ 0.1mm) and selecting high-strength fasteners (such as grade 8.8 bolts 16), it is ensured that the connection is secure and can withstand vibration frequencies of 10-50Hz and accelerations ≤ 5m / s², ensuring the stability of the protective mechanism 7 during equipment operation. To enhance the structural strength and durability of mounting plate 1, this embodiment uses alloy steel to manufacture mounting plate 1. By adding alloying elements such as manganese and chromium, the tensile strength of mounting plate 1 reaches over 600 MPa, and the yield strength is ≥350 MPa. It also possesses excellent impact resistance (impact absorption energy ≥27 J) and deformation resistance, capable of withstanding component installation loads exceeding 50 kg, ensuring structural stability of the device during transportation, installation, and long-term operation. To further enhance wiring convenience, this embodiment features several wiring holes 9 on the frame 8. The number and spacing of the wiring holes 9 are optimized based on common cable specifications (such as RVV and YJV series) and wiring requirements. Typically, 4-8 holes are provided, with hole diameters ranging from Φ8 to Φ16mm, accommodating wires of different diameters. The edges of the holes are rounded (radius ≥1.5mm) to prevent cable wear. A removable rubber sealing ring (IP54 protection rating) is also used, facilitating wiring operations while meeting dust and water protection requirements. To enhance the structural strength and service life of the heat dissipation mesh 11, this embodiment uses stainless steel (such as 304 stainless steel) to make the heat dissipation mesh 11. This material has excellent tensile strength (≥520MPa) and corrosion resistance (salt spray test ≥1000 hours). Its mesh structure is formed by laser cutting, and the edges are bent to form 2mm reinforcing ribs. The overall hardness reaches HV200 or above, and it can withstand vertical pressure of ≥10N without deformation. While ensuring efficient heat dissipation, it significantly improves impact resistance and environmental adaptability.

[0015] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-power automatic switching device combining an AC contactor and an air switch, comprising a mounting plate (1) and a protective mechanism (7), characterized in that: The mounting plate (1) is provided with a first air switch (2), a first AC contactor (3), a second air switch (4), a second AC contactor (5), and an outgoing air switch (6). The first air switch (2), the first AC contactor (3), the second air switch (4), the second AC contactor (5), and the outgoing air switch (6) are electrically connected. The protective mechanism (7) includes a frame (8), a wiring hole (9), a switch door (10), a fixing block (12), a square block (13), a limit block (14), a long plate (15), bolts (16), and a round plate (17). The frame (8) is in contact with one side of the mounting plate (1). The wiring hole (9) is opened on the frame (8). The switch door (10) is hinged to the front of the frame (8). One end of the square block (13) is fixedly connected to the frame (8), and the other end of the square block (13) extends into the fixing block (12). The fixing block (12) has a groove that matches the square block (13). One end of the limiting block (14) extends into the square block (13), and the other end of the limiting block (14) extends into the fixing block (12). The long plate (15) is fixedly connected to the fixing block (12). The bolt (16) is connected to the long plate (15). The circular plate (17) is fixedly connected to the bolt (16). A gap is left between the side wall of the circular plate (17) and the limiting block (14).

2. The dual-power automatic switching device combining an AC contactor and an air switch according to claim 1, characterized in that: The switch door (10) is provided with a heat dissipation mesh (11), which is embedded in the switch door (10).

3. The dual-power automatic switching device combining an AC contactor and an air switch according to claim 2, characterized in that: The fixing block (12) is fixedly connected to the mounting plate (1).

4. The dual-power automatic switching device combining an AC contactor and an air switch according to claim 3, characterized in that: The mounting plate (1) is made of alloy steel.

5. The dual-power automatic switching device combining an AC contactor and an air switch according to claim 4, characterized in that: The wiring hole (9) has several openings.

6. The dual-power automatic switching device combining an AC contactor and an air switch according to claim 5, characterized in that: The heat dissipation mesh (11) is made of stainless steel.

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