A pre-detection overload tripping device for a disconnecting switch

Abstract

This utility model relates to the field of industrial electrical switches, and in particular to a disconnecting switch. This self-testing explosion-proof disconnecting switch consists of an insulating frame, an electromagnet, a tripping linkage, a self-testing conductive component, and a starting frame. The electromagnet is installed inside the insulating frame, and a tripping linkage is installed at the upper end of the insulating frame. The core push-pull head at the end of the iron core inside the electromagnet is linked with the tripping linkage. The tripping linkage is provided with a linkage plate tripping pin. A self-testing conductive component is installed at the rear end of the tripping linkage. The tripping body at the front end of the self-testing conductive component contacts the linkage plate tripping pin on the tripping linkage. Starting frames are provided on both sides of the insulating frame. When this device is working, it can perform pre-detection of the load circuit to prevent danger caused by short circuits or overloads in the downstream circuit when the disconnecting switch is closed.

Description

Technical Field

[0001] This utility model relates to the field of industrial electrical switches, and in particular to a disconnecting switch. Background Technology

[0002] In the field of circuit control, areas such as the main power distribution room and equipment distribution boxes in factories require the use of disconnecting switches to control the on / off state of the circuit. Traditional disconnecting switches use two sets of conductive contacts or conductive plates to connect and disconnect the circuit. When a high-load, high-current appliance is not disconnected in the load circuit, or when a short circuit occurs in the load circuit due to a fault, the contact points of the internal conductive contacts of the disconnecting switch can generate a current several to hundreds of times greater than its carrying capacity after the switch is closed. This current will immediately burn out the switch and cause a violent arc explosion, which in severe cases can even endanger life. For the safety of users, after the disconnecting switch is turned off, there may be electrical appliances with small current, such as lights and fans, that remain on in the downstream circuit. At this time, there is a conductive connection between the various cables in the downstream load circuit of the disconnecting switch. When this small load appliance starts, the current generated is within the safe closing range of the disconnecting switch. Existing circuit testing equipment, such as test pens or multimeters, can only detect the continuity or resistance of the circuit, and cannot accurately determine whether the load of the downstream circuit of the disconnecting switch is within the safe closing range. This can easily lead to misjudgment by the closing operator, and operational errors can cause serious safety accidents, which is extremely inconvenient. Summary of the Invention

[0003] To address the aforementioned shortcomings, this utility model provides a self-testing explosion-proof disconnect switch, comprising an insulating frame, an electromagnet, a tripping linkage, a self-testing conductive component, and a starting frame. The electromagnet is installed inside the insulating frame, and a tripping linkage is installed at the upper end of the insulating frame. The core push-pull head at the end of the iron core inside the electromagnet is linked with the tripping linkage. The tripping linkage is equipped with a linkage plate tripping pin, and a self-testing conductive component is installed at the rear end of the tripping linkage. The tripping body at the front end of the self-testing conductive component contacts the linkage plate tripping pin on the tripping linkage. Starting frames are provided on both sides of the insulating frame, and V-shaped springs are provided on the mounting pins of the starting frames. Attached Figure Description

[0004] The present invention will now be explained in further detail with reference to the accompanying drawings.

[0005] Figure 1 This is a schematic diagram of the overall structure of the device.

[0006] Figure 2 This is a detailed structural diagram of the device.

[0007] Figure 3 This is a schematic diagram of the cross-sectional structure of the device.

[0008] Figure 4 , Figure 5 This is a schematic diagram of the device's operation.

[0009] Figure 6 This is a schematic diagram of the actual application of the device. Detailed Implementation

[0010] pass Figure 1 As can be seen, the device consists of an insulating frame 5, an electromagnet 1, a tripping linkage 2, a self-testing conductive component 3, and a starting frame 4. The electromagnet 1 is installed inside the insulating frame 5, and the electromagnet has an iron core inside. The upper end of the insulating frame 5 is provided with the tripping linkage 2. The iron core push-pull head 7 at the end of the iron core inside the electromagnet is linked with the tripping linkage 2. When the electromagnet is attracted, it will pull the upper tripping linkage to move. The tripping linkage 2 has tripping pull rods 11 on both sides of the linkage plate mounting shaft 9 on the upper side, and a linkage plate tripping pin 10 at the rear end. The self-testing conductive component 3 is installed at the rear end of the tripping linkage 2. The tripping body 13 at the front end of the self-testing conductive component contacts the linkage plate tripping pin 10 at the rear end of the tripping linkage. The insulating frame 5 has a starting frame 4 on both sides, and a V-shaped spring 24 is provided on the mounting pin of the starting frame.

[0011] pass Figure 2As can be seen, the electromagnet 1 is installed inside the insulating frame 5. An iron core 6 is located at the upper end of the electromagnet's interior, and an iron core push-pull head 7 is located at the end of the iron core. This device consists of three sets of electromagnets 1 arranged in parallel to form an electromagnet matrix, which respectively detects the three sets of three-phase AC power supplies of the input device. A tripping linkage is located at the upper end of the insulating frame. The tripping linkage consists of a linkage plate 8, a linkage plate mounting shaft 9, a linkage plate tripping pin 10, and a tripping pull rod 11. Both ends of the linkage plate mounting shaft 9 are mounted on the insulating frame using mounting heads. The front end of the linkage plate mounting shaft is equipped with a linkage plate 8, which has three sets of linkage plate slots 12. The iron core push-pull head 7 at the upper end of the iron core enters the linkage plate slot 12. When the iron core inside the electromagnet is pulled downwards, the linkage plate is pulled upwards. The linkage plate 8 is tilted downwards, and a linkage plate release pin 10 is provided at the rear end of the linkage plate mounting shaft. Release levers 11 are provided on both sides of the linkage plate mounting shaft. When the electromagnet drives the linkage plate 8 to tilt downwards, the linkage plate release pin 10 lifts upwards, and the release levers 11 on both sides swing backwards. A self-testing conductive component is provided at the rear end of the release linkage component. The self-testing conductive component consists of a release body 13, a relay body 14, and a sliding shaft 15. Both ends of the sliding shaft 15 are fixed to the insulating frame. The release body 13 is provided at the front end of the sliding shaft, and the relay body 14 is provided at the rear end. The release body and the relay body can slide back and forth on the sliding shaft. A limit card 16 is provided on the insulating frame between the release body and the relay body to limit the movement position of the release body and the relay body on the sliding shaft. The front end of the tripping body 13 contacts the tripping pin 10 of the linkage plate. When the tripping pin of the linkage plate is in a horizontal position, the position of the tripping body 13 on the slide shaft can be locked. When the electromagnet drives the linkage plate 8 to tilt downward, the tripping pin 10 of the linkage plate at the rear end can be lifted upward and separated from the tripping body 13. After the tripping body is unlocked, it can continue to move towards the front end of the slide shaft. The tripping body 13 is provided with three sets of tripping body conductive plates 17. The relay body 14 is provided with three sets of relay body conductive plates 18 at the corresponding positions of the tripping body conductive plates. When the relay body slides to one side of the tripping body, the two sets of conductive plates can contact each other. The tripping body conductive plates 17 are connected to the output terminal wire of the coil on the electromagnet 1 using a flexible conductive strip 19. The relay body conductive plates 18 are connected to the output terminal wire of the coil on the electromagnet 1 using a flexible conductive strip. The output terminal 20 is connected to the outside of the insulating frame. A starting frame 4 is provided on both sides of the insulating frame. The lower end of the starting frame is mounted on the insulating frame, while the upper end can swing freely. A permanent magnet 21 is provided at the upper end of the starting frame. Magnetic attracting iron pillars 22 are provided on the end faces of the relay body 14 that contact the permanent magnet on the starting frame. When the starting frame swings forward, the attraction force of the permanent magnet drives the relay body to slide towards the front end of the sliding shaft. A relay body reset spring 23 is installed between the relay body and the insulating frame to provide a reset pulling force for the relay body. A V-shaped spring 24 is provided on the mounting pin of the starting frame. A starting rod limiting pin 25 is provided in the middle of the starting frame. Two sets of starting frame limiting pins restrict the V-shaped spring within the area. A tripping body linkage buckle 26 is provided on both sides of the tripping body 13.One end of the V-shaped spring 24 passes through the linkage of the tripping body to drive the tripping body to move. A pull hole 27 is provided in the middle of the crossbar at the upper end of the starting frame. The input wire of the coil on the electromagnet 1 extends out of the insulating frame to form a power input terminal 28. When the device is working, power is input through the power input terminal 28 and connected to the load device through the output terminal 20. When the starting frame 4 swings forward, it drives the relay body 14 to slide forward and makes the relay body and the two sets of conductive plates on the tripping body 13 conductive. When a short circuit or overload occurs in the load circuit, the current generates a magnetic force sufficient to drive the tripping linkage within the three sets of electromagnets 1, thereby driving the tripping linkage and the self-test conductive component to disconnect the circuit path.

[0012] pass Figure 3 As can be seen, an electromagnet 1 is installed inside the insulating frame 5. One end of the electromagnet coil extends out of the insulating frame to form a power input terminal 28. A linkage plate mounting shaft 9 is provided at the upper end of the insulating frame. A linkage plate 8 is provided at the front end of the linkage plate mounting shaft. The iron core push-pull head 7 at the upper end of the electromagnet is linked with the linkage plate. A linkage plate tripping pin 10 is provided at the rear end of the linkage plate mounting shaft. Tripping pull rods 11 are provided on both sides of the linkage plate mounting shaft. The two ends of the sliding shaft 15 are installed on the insulating body. A tripping body 13 and a relay body 14 are provided on the sliding shaft. A limit card 16 is provided between the insulating frame and the tripping body and the relay body. A tripping body conductive plate is provided on the rear end face of the tripping body. 17. A relay body conductive sheet 18 is provided at the position corresponding to the tripping body conductive sheet on the front end face of the relay body. The tripping body conductive sheet is connected to the output end of the electromagnet 1 coil by a flexible conductive strip 19. The relay body conductive sheet is connected to the output end 20 by a flexible conductive strip. Tripping body linkage buckles 26 are provided on both sides of the tripping body. Magnetic iron posts 22 are provided on both sides of the relay body. A starting frame 4 is provided on both sides of the insulating frame. A permanent magnet 21 is provided on the contact surface between the upper end of the starting frame and the magnetic iron post 22. A V-shaped spring 24 is provided on the mounting post at the lower end of the starting frame. One end of the V-shaped spring is positioned by the starting frame limiting pin 25, and the other end passes through the tripping body linkage buckle 26.

[0013] pass Figure 4As can be seen, when the device is working, the mains power is connected to the power input terminal 28, and the output terminal 20 is connected to the load circuit. When the device starts, it can pre-detect whether there is a short circuit or overload in the load circuit. When in use, the starter frame 4 is manually driven to move to the front end. Since the permanent magnet 21 on the starter frame and the magnetic iron column 22 on the relay body 14 are in a attracted state, the relay body will move with the starter frame to the front end of the slide shaft 15 and make the tripping body conductive plate 17 contact the relay body conductive plate 18. At this time, the power is input to the load through the power input terminal 28, electromagnet 1, flexible conductive strip 19 and output terminal 20. When there is no short circuit in the load circuit or the total starting current of the load appliance is lower than the current carrying capacity of the internal coil of the electromagnet 1, the internal coil of the electromagnet will act as a conductor and supply power to the load circuit. When the starting frame 4 continues to move to the front end, the limit card 16 will prevent the relay body from moving to the front end. The permanent magnet 21 will separate from the magnetic iron column 22. The relay body 14 will move to the rear end and reset under the pulling force of the relay body reset spring 23. At this time, the relay body conductive piece 18 will separate from the tripping body conductive piece 17, and the circuit channel will be disconnected, thereby realizing the detection procedure of instantaneous conduction of the circuit channel.

[0014] pass Figure 5 It can be seen that when there is a short circuit in the load circuit or the total current of the load appliance is greater than the current carrying capacity of the coil inside the electromagnet, the current will generate a strong magnetic force in the coil inside the electromagnet 1 to attract the iron core. The iron core push-pull head 7 at the end of the iron core pulls the linkage plate 8 downward, and the linkage plate trip pin 10 at the rear end of the linkage plate lifts upward. At this time, the linkage plate trip pin separates from the trip body 13. Under the push of the V-shaped spring 24, the trip body slides towards the front end of the slide shaft 15, forcing the trip body to separate from the relay body, thereby performing the tripping and power-off action. When the linkage plate descends, the tripping rod 11 also swings to the rear end. By pulling the external tripping assembly connected to it through the end of the tripping rod, the external components can be driven to run.

[0015] pass Figure 6It can be seen that when this overload tripping device is used in the configuration of a disconnecting switch, it will be installed inside the disconnecting switch body 29 at the rear end of the relay tripping assembly 30. The closing linkage rod 31 connects the closing rod 32 of the relay tripping assembly to the pull hole at the top of the starting frame 4. The tripping connecting rod 36 connects the end of the tripping pull rod 11 to the trigger pin 37 on the relay tripping assembly. The power input terminal 28 is connected to the conductive plate 33 at the input end of the disconnecting switch, and the output terminal 20 is connected to the conductive plate 35 at the output end of the disconnecting switch via the pre-test output line 34. This device can then be installed and matched with the disconnecting switch. When the disconnecting switch is working, the conductive plate 33 at the input end is connected to the power grid, and the conductive plate 35 at the output end is connected to the load circuit system, and the equipment is ready for use. When manual closing of the disconnecting switch is required, the closing rod 32 of the disconnecting switch is manually pushed upwards. Since two-thirds of the closing rod's travel is in the no-load start-up phase during the closing action, the relay tripping assembly 30 does not discharge electricity during this no-load start-up phase. When the circuit channel is open, the no-load start-up phase of this relay trip assembly is the working phase of the overload trip device. During this phase, the closing linkage rod 31 will pull the starting frame 4 to connect the circuit channel between the inlet conductive plate 33 and the outlet conductive plate 35. At this time, when there is no short circuit or overload in the load circuit and the electrical equipment is in a conducting state, the coil inside the electromagnet 1 can form a wire-like function to transmit current. When the closing rod 32 continues to push, it will drive the relay trip assembly to close and conduct the full load circuit channel. When there is a short circuit in the load circuit or the total power of the electrical equipment in the circuit is greater than the current carrying capacity of the electromagnet during the start-up of the starting frame 4, the current can generate a magnetic force in the coil of the electromagnet 1 sufficient to drive the trip action. At this time, the electromagnet will pull the trip lever 11 and the trip connecting rod 36 to the rear end, thereby pulling open the trigger pin 37 of the relay trip assembly. At this time, the relay trip assembly will trip and terminate the closing procedure, thereby realizing the pre-detection of possible short circuits or overloads in the circuit.

[0016] The wire diameter of the electromagnet coil in this device is determined by the closing power of the disconnecting switch to be configured. For example, taking a disconnecting switch with a total capacity of 100A as an example, its safe closing current range is approximately 50A. In this case, a wire with a breaking capacity of 40A can be used to make the electromagnet coil. When the device performs a pre-test procedure, if there is no short circuit in the load circuit or no electrical appliance with a total power exceeding 40A is in a conducting state, the electromagnet coil can form a conductor state to perform instantaneous power supply pre-test for the downstream load. At this time, the disconnecting switch is within the safe closing range and can perform the closing action. When a short circuit occurs in the load circuit or the total power of the electrical appliance is greater than 50A or higher, a short circuit or similar situation can be formed in the downstream circuit. The conductor status indicates that the disconnector is in a risky range where it cannot be closed. At this time, the current can generate a magnetic force in the electromagnet coil to trip, driving the relay trip component to terminate the closing procedure. Thus, the magnetic force generated by the electromagnet coil can accurately detect possible short circuits or overloads in the downstream load circuit. The fully mechanical physical detection method can maintain extremely high accuracy, preventing the shortcomings of traditional detection methods that cannot accurately detect load power. It can avoid the danger to the operator caused by the disconnector closing due to high risks. The size of the device can be changed according to the size of the disconnector, so it can be matched with various specifications or manual and automatic disconnectors, meeting the needs of commercial applications.

[0017] The above is a detailed description of the preferred embodiments of this utility model. However, the invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A pre-detection overload tripping device for a disconnecting switch, comprising an insulating frame (5), an electromagnet (1), a tripping linkage component (2), a self-testing conductive component (3), and a starting frame (4), characterized in that; The electromagnet (1) is installed inside the insulating frame (5). A tripping linkage component (2) is installed at the upper end of the insulating frame (5). The core push-pull head (7) at the end of the iron core inside the electromagnet is linked with the tripping linkage component (2). A linkage plate tripping pin (10) is provided on the tripping linkage component (2). A self-testing conductive component (3) is installed at the rear end of the tripping linkage component (2). The tripping body (13) at the front end of the self-testing conductive component contacts the linkage plate tripping pin (10) on the tripping linkage component. A starting frame (4) is provided on both sides of the insulating frame (5). A V-shaped spring (24) is provided on the mounting pin of the starting frame.

2. The pre-detection overload tripping device for the disconnecting switch according to claim 1, characterized in that; The electromagnet (1) has an iron core (6) at its upper internal end, and an iron core push-pull head (7) at the end of the iron core.

3. The pre-detection overload tripping device for the disconnecting switch according to claim 1, characterized in that; The tripping linkage component (2) consists of a linkage plate (8), a linkage plate mounting shaft (9), a linkage plate tripping pin (10), and a tripping lever (11). The two ends of the linkage plate mounting shaft (9) are mounted on the insulating frame using mounting heads. The front end of the linkage plate mounting shaft is provided with a linkage plate (8), and the linkage plate (8) is provided with three sets of linkage plate slots (12). The rear end of the linkage plate mounting shaft is provided with a linkage plate tripping pin (10), and the two sides of the linkage plate mounting shaft are provided with tripping levers (11).

4. The pre-detection overload tripping device for the disconnecting switch according to claim 1, characterized in that; The self-testing conductive component (3) consists of a tripping body (13), a relay body (14), and a sliding shaft (15). The two ends of the sliding shaft (15) are fixed to an insulating frame. The front end of the sliding shaft is provided with the tripping body (13), and the rear end is provided with the relay body (14). The tripping body and the relay body can slide back and forth on the sliding shaft. A limit card (16) is provided on the insulating frame between the tripping body and the relay body. The tripping body (13) is provided with three sets of tripping body conductive plates (17). The relay body (14) is conductive to the tripping body. Three sets of relay body conductive plates (18) are provided at corresponding positions. The tripping body conductive plate (17) is connected to the output end wire of the electromagnet (1) by a flexible conductive strip (19). The relay body conductive plate (18) is connected to the output end (20) outside the insulating frame by a flexible conductive strip. The tripping body (13) is provided with tripping body linkage buckles (26) on both sides. The end faces of the relay body (14) that are in contact with the starter frame are provided with magnetic iron posts (22). The relay body reset springs (23) are provided between the two sides and the insulating frame.

5. The pre-detection overload tripping device for the disconnecting switch according to claim 1, characterized in that; The upper end of the starter frame (4) is provided with a permanent magnet (21) at the position where it contacts the magnetic iron column, the middle part of the starter frame is provided with a starter rod limiting pin (25), and the mounting pin of the starter frame is provided with a V-shaped spring (24).

6. The pre-detection overload tripping device for the disconnecting switch according to claim 1, characterized in that; The V-shaped spring (24) is positioned by the starting rod limiting pin (25), and one end of the V-shaped spring (24) is inserted into the release body linkage buckle (26).

7. The pre-detection overload tripping device for the disconnecting switch according to claim 1, characterized in that; The number of electromagnets (1) is 3 sets.

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