Alternating current contactor with leakage protection function

Abstract

The utility model discloses an alternating current contactor with a leakage protection function, which relates to the technical field of electrical equipment, comprises a leakage protection unit and a touch control unit, and is characterized in that when a circuit leaks electricity, a zero sequence current transformer generates induction current and transmits the induction current to a circuit board; the circuit board amplifies induction current and conducts the induction current to the electromagnetic release, the electromagnetic release drives the reset button to rotate through the two connecting plates after being powered on and drives the sliding block to move upwards through the connecting rod, so that the two first contact pieces are far away from the two wiring terminals below, the control current cannot be conducted to the electromagnetic coil, and the static iron core cannot continue to attract the movable iron core. And the reset spring drives the movable iron core to reset, so that each contact on the contact component is respectively far away from the corresponding contact and the L-shaped contact, the main circuit is disconnected, the internal structure is compact, the size of the device can be effectively controlled, and the reliability is high.

Description

Technical Field

[0001] This utility model belongs to the field of electrical equipment technology, and in particular relates to an AC contactor with leakage protection function. Background Technology

[0002] In modern power systems and industrial automation, AC contactors and residual current devices (RCDs) are important electrical devices that ensure the safe and stable operation of circuits. They play key roles in different aspects. As a widely used control device, the AC contactor is mainly used to frequently connect and disconnect AC circuits. It can quickly realize the circuit switching operation according to the control signal, and meet the starting, stopping and forward and reverse control requirements of load equipment such as motors. The RCD focuses on detecting the leakage current in the circuit. When the detected leakage current exceeds the set value, it can quickly cut off the circuit and play the role of leakage protection.

[0003] Existing AC contactors with leakage protection functions have a relatively complex structure, often integrating numerous components. This complex structural design directly results in their large and bulky size. Compared to simple AC contactors or leakage protection devices, they have a significant disadvantage in terms of space occupation. Their excessive size makes installation and adaptation difficult, resulting in poor practicality. Utility Model Content

[0004] The purpose of this utility model is to provide an AC contactor with leakage protection function, which solves the problem that the existing AC contactors with leakage protection function are difficult to install and adapt due to their large size.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is an AC contactor with leakage protection function, including a housing, a leakage protection unit and a touch control unit are provided inside the housing, and two sets of symmetrical wiring terminals are fixedly installed on the outer wall of the housing.

[0007] The leakage protection unit includes a slider that slides on the inner wall of the housing, and a first contact piece is fixedly connected to both sides of the slider;

[0008] The touch unit includes a stationary iron core fixedly installed at the bottom of the housing. An electromagnetic coil is sleeved on the stationary iron core. Two terminals are provided on the outer wall of the electromagnetic coil. The two first contact pieces are electrically connected to the two terminals respectively.

[0009] The present invention is further configured such that one end of a plurality of terminals located on the same side is fixedly connected to a connecting piece located inside the housing, and a contact located below the connecting piece is fixedly connected to the inner wall of the housing; and one end of the remaining terminals is fixedly connected to an L-shaped contact located inside the housing.

[0010] The present invention is further configured such that a zero-sequence current transformer is fixedly installed on the inner wall of the housing, and a circuit board electrically connected to the zero-sequence current transformer is fixedly installed on the inner wall of the housing. A plurality of transmission lines are wound on the zero-sequence current transformer, one end of the transmission line is electrically connected to a connecting piece, and the other end of the transmission line is electrically connected to a contact.

[0011] The present invention is further configured such that a reset button is rotatably fitted on the top of the housing, and a connecting rod is rotatably fitted on one side of the reset button off-center, with the end of the connecting rod away from the reset button rotatably fitted with a slider.

[0012] The present invention is further configured such that an electromagnetic trip unit is fixedly installed inside the housing, the electromagnetic trip unit is electrically connected to the circuit board, and two symmetrical connecting plates are rotatably connected between the electromagnetic trip unit and the reset button.

[0013] The present invention is further configured such that a moving iron core is slidably fitted inside the housing and located above the stationary iron core, a contact component is fixedly installed on the top of the moving iron core, and a reset spring located on the top of the electromagnetic coil is sleeved on the bottom of the moving iron core.

[0014] The present invention is further configured such that a sliding hole is provided on the periphery of the reset button, a locking rod is slidably fitted in the sliding hole, a compression spring is provided at one end of the locking rod in the sliding hole, and a limiting plate located below the reset button is fixedly connected to the inner wall of the housing.

[0015] This utility model has the following beneficial effects:

[0016] 1. When leakage occurs in the circuit, the zero-sequence current transformer of this utility model can sensitively capture the leakage signal and quickly generate an induced current. This current is amplified by the circuit board and transmitted to the electromagnetic trip unit. The electromagnetic trip unit then reacts immediately, driving the reset button to rotate through the two connecting plates, and then pushing the slider upward with the help of the connecting rod. This series of actions quickly cuts off the path of the control current to the electromagnetic coil, so that the stationary iron core loses its attraction to the moving iron core. The moving iron core quickly resets under the action of the reset spring, causing the contacts on the contact component to separate from the corresponding contacts and L-shaped contacts, thus disconnecting the main circuit in time, effectively preventing the further expansion of the leakage accident and ensuring electrical safety.

[0017] 2. This utility model ingeniously integrates the leakage protection unit and the touch control unit in its design. The components are reasonably arranged and closely cooperate with each other. This compact internal structure design greatly reduces the number of parts and the overall size compared with traditional AC contactors with leakage protection function. The smaller size makes it more flexible and convenient to install, and can adapt to a variety of different electrical equipment installation environments, effectively improving the practicality of the product.

[0018] 3. This utility model separates the leakage protection unit from the AC contact unit, and is specifically responsible for monitoring leakage. This independence ensures that the leakage protection function is not affected by the normal operation of the AC contact unit, and can consistently and accurately detect and respond to leakage faults, greatly improving the reliability of the entire device.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an AC contactor with leakage protection function.

[0022] Figure 2 This is a schematic diagram of the structure of this utility model after the top cover has been removed;

[0023] Figure 3 This is a schematic diagram of the structure of the leakage protection unit inside the casing;

[0024] Figure 4 This is a schematic diagram of the touch unit structure;

[0025] Figure 5 This is a schematic diagram of the mechanism on the reset button.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Housing; 2. Leakage protection unit; 3. Touch unit; 4. Terminal block; 5. Slider; 6. First contact piece; 7. Electromagnetic coil; 8. Terminal block; 9. Connecting piece; 10. Contact; 11. L-shaped contact; 12. Zero-sequence current transformer; 13. Circuit board; 14. Transmission line; 15. Reset button; 16. Linkage rod; 17. Electromagnetic trip unit; 18. Connecting plate; 19. Stationary iron core; 20. Moving iron core; 21. Contact component; 22. Return spring; 23. Sliding hole; 24. Locking rod; 25. Compression spring; 26. Limiting plate. Detailed Implementation

[0028] 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 skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation

[0030] Please see Figure 1-5 The present invention is an AC contactor with leakage protection function, including a housing 1, and a leakage protection unit 2 and a touch control unit 3 are provided inside the housing 1.

[0031] Two sets of symmetrical terminals 4 are fixedly installed on the outer wall of the housing 1. The leakage protection unit 2 includes a slider 5 that slides on the inner wall of the housing 1. First contact pieces 6 are fixedly connected to both sides of the slider 5. The touch unit 3 includes a stationary iron core 19 fixedly installed at the bottom of the housing 1. An electromagnetic coil 7 is sleeved on the stationary iron core 19. Two terminals 8 are provided on the outer wall of the electromagnetic coil 7. The two first contact pieces 6 are electrically connected to the two terminals 8 respectively. During normal operation, the two first contact pieces 6 are respectively attached to the ends of the two terminals 4 below located inside the housing 1. The control current passes through the two terminals 4 and the two first contact pieces 6 and is conducted to the electromagnetic coil 7. Then, the electromagnetic coil 7 controls the connection of the main circuit. When leakage occurs in the main circuit, the slider 5 will start to move upward, so that the two first contact pieces 6 are away from the two terminals 4 below. The current cannot be conducted to the electromagnetic coil 7, which disconnects the main circuit and prevents the main circuit from continuously leaking.

[0032] A movable iron core 20 is slidably fitted inside the housing 1, located above the stationary iron core 19. A contact component 21 is fixedly installed on the top of the movable iron core 20, and a return spring 22 is sleeved on the bottom of the movable iron core 20, located on the top of the electromagnetic coil 7. When the electromagnetic coil 7 is energized, a magnetic field is generated around it. Under the action of the magnetic field, the stationary iron core 19 generates an electromagnetic attraction force, attracting the movable iron core 20 to move towards the stationary iron core 19 and compressing the return spring 22. The contact component 21 will also move accordingly.

[0033] Specifically, one end of several terminals 4 located on the same side is fixedly connected to a connecting piece 9 located inside the housing 1, and a contact 10 located below the connecting piece 9 is fixedly connected to the inner wall of the housing 1. One end of the remaining terminals 4 is fixedly connected to an L-shaped contact 11 located inside the housing 1. When the electromagnetic coil 7 is energized, causing the contact component 21 to move, each contact on the contact component 21 will respectively engage with the corresponding contact 10 and L-shaped contact 11, thus connecting the main circuit.

[0034] A zero-sequence current transformer 12 is fixedly installed on the inner wall of the housing 1. A circuit board 13 electrically connected to the zero-sequence current transformer 12 is also fixedly installed on the inner wall of the housing 1. Several transmission lines 14 are wound around the zero-sequence current transformer 12. One end of the transmission line 14 is electrically connected to the connecting piece 9, and the other end of the transmission line 14 is electrically connected to the contact 10. These transmission lines 14 are connected to the phase line and the neutral line through the connecting piece 9. Under normal circumstances, the magnetic fields generated by the phase line and the neutral line current cancel each other out, and there is no induced current on the secondary side of the transformer. When leakage occurs, a residual current appears, and an induced current is generated on the secondary side of the transformer. The induced current is conducted to the circuit board 13.

[0035] Furthermore, a reset button 15 is rotatably fitted on the top of the housing 1. A connecting rod 16 is rotatably fitted on one side of the reset button 15 off-center. The end of the connecting rod 16 away from the reset button 15 is rotatably fitted with the slider 5. An electromagnetic trip unit 17 is fixedly installed inside the housing 1. The electromagnetic trip unit 17 is electrically connected to the circuit board 13. Two symmetrical connecting plates 18 are rotatably fitted between the electromagnetic trip unit 17 and the reset button 15. When leakage occurs in the main circuit, the circuit board 13 will amplify the induced current and conduct it to the electromagnetic trip unit 17. After the electromagnetic trip unit 17 is energized, it will pull the two connecting plates 18. The two connecting plates 18 will drive the reset button 15 to rotate. When the reset button 15 rotates, it will drive the slider 5 to move upward through the connecting rod 16 to control the main circuit to disconnect.

[0036] The reset button 15 has a sliding hole 23 on its side. A locking rod 24 is slidably fitted inside the sliding hole 23. A compression spring 25 is provided at one end of the locking rod 24 inside the sliding hole 23. A limiting plate 26 located below the reset button 15 is fixedly connected to the inner wall of the housing 1. Since the compression spring 25 is always in a compressed state, one end of the locking rod 24 will always press against the top surface of the limiting plate 26, thereby preventing the reset button 15 from rotating arbitrarily.

[0037] The operation process of this embodiment is as follows: When leakage occurs in the main circuit, the zero-sequence current transformer 12 will generate an induced current and conduct it to the circuit board 13. The circuit board 13 will amplify the induced current and conduct it to the electromagnetic trip unit 17. After the electromagnetic trip unit 17 is powered on, it will drive the reset button 15 to rotate through the two connecting plates 18. When the reset button 15 rotates, it will drive the slider 5 to move upward through the connecting rod 16, so that the two first contact pieces 6 are away from the two terminals 4 below. The control current cannot be conducted to the electromagnetic coil 7, and the stationary iron core 19 can no longer attract the moving iron core 20. The reset spring 22 drives the moving iron core 20 to reset, so that each contact on the contact component 21 is away from the corresponding contact 10 and L-shaped contact 11, thereby disconnecting the main circuit.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An AC contactor with leakage protection function, comprising a housing (1), characterized in that: The housing (1) is provided with a leakage protection unit (2) and a touch unit (3), and two sets of symmetrical wiring terminals (4) are fixedly installed on the outer wall of the housing (1). The leakage protection unit (2) includes a slider (5) that slides on the inner wall of the housing (1), and a first contact piece (6) is fixedly connected to both sides of the slider (5); The touch unit (3) includes a stationary iron core (19) fixedly installed at the bottom of the housing (1). An electromagnetic coil (7) is sleeved on the stationary iron core (19). Two terminals (8) are provided on the outer wall of the electromagnetic coil (7). The two first contact pieces (6) are electrically connected to the two terminals (8) respectively.

2. An AC contactor with leakage protection function according to claim 1, characterized in that, One end of several terminals (4) located on the same side is fixedly connected to a connecting piece (9) located inside the housing (1). The inner wall of the housing (1) is fixedly connected to a contact (10) located below the connecting piece (9). One end of the remaining terminals (4) is fixedly connected to an L-shaped contact (11) located inside the housing (1).

3. An AC contactor with leakage protection function according to claim 2, characterized in that, A zero-sequence current transformer (12) is fixedly installed on the inner wall of the housing (1). A circuit board (13) electrically connected to the zero-sequence current transformer (12) is fixedly installed on the inner wall of the housing (1). Several transmission lines (14) are wound around the zero-sequence current transformer (12). One end of the transmission line (14) is electrically connected to the connecting piece (9), and the other end of the transmission line (14) is electrically connected to the contact (10).

4. An AC contactor with leakage protection function according to claim 3, characterized in that, The top of the housing (1) is rotatably fitted with a reset button (15), and a connecting rod (16) is rotatably fitted on one side of the reset button (15) off-center. The end of the connecting rod (16) away from the reset button (15) is rotatably fitted with the slider (5).

5. An AC contactor with leakage protection function according to claim 4, characterized in that, An electromagnetic trip unit (17) is fixedly installed inside the housing (1). The electromagnetic trip unit (17) is electrically connected to the circuit board (13). The electromagnetic trip unit (17) and the reset button (15) are rotatably connected by two symmetrical connecting plates (18).

6. An AC contactor with leakage protection function according to claim 5, characterized in that, The housing (1) has a sliding fit with a moving iron core (20) located above the stationary iron core (19). A contact component (21) is fixedly installed on the top of the moving iron core (20), and a reset spring (22) located on the top of the electromagnetic coil (7) is sleeved on the bottom of the moving iron core (20).

7. An AC contactor with leakage protection function according to claim 6, characterized in that, The reset button (15) has a sliding hole (23) on its periphery. A locking rod (24) is slidably fitted inside the sliding hole (23). A compression spring (25) is provided at one end of the locking rod (24) inside the sliding hole (23). A limiting plate (26) located below the reset button (15) is fixedly connected to the inner wall of the housing (1).

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