A load switch

Abstract

The utility model relates to a load switch, contain the locking electromagnet (201) of series connection in primary circuit, the trigger rod of locking electromagnet (201) is opposite to a microswitch (202), and microswitch (202) is in open circuit state, microswitch (202) and under -voltage closing electromagnet (107) series connection after series connection in primary circuit, and there is an energy storage capacitor (203) with series connection's microswitch (202) and under -voltage closing electromagnet (107) parallel, and under -voltage closing electromagnet (107) drives half axle (102) rotation through the push plate no. 2 (108) of installing in half axle (102). The utility model relates to a load switch, and when under -voltage, can automatically carry out closing operation.

Description

Technical Field

[0001] This utility model is a divisional application of utility model patent application number CN202421478736.5, filed on June 26, 2024, entitled "An Undervoltage Closing Mechanism and Load Switch". This utility model relates to a load switch with undervoltage closing function and belongs to the field of electrical technology. Background Technology

[0002] Currently, load switches / circuit breakers utilize pre-energy storage mechanisms for rapid closing during application. For example, the pre-energy storage mechanism described in our Chinese patent CN201820104970.X, driven by a closing electromagnet, rotates a half-shaft, releasing a latch on the release plate to achieve rapid closing. These pre-energy storage mechanisms are generally configured to trip under voltage conditions, as illustrated in Chinese patent CN201420394183.5, "An Undervoltage Tripping Mechanism for Circuit Breakers." This mechanism trips when the primary circuit experiences undervoltage, requiring manual closing before normal operation resumes. Therefore, some users have proposed designing a system with an automatic closing function for secondary circuit undervoltage to ensure reliable power supply to the primary circuit. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a load switch based on an undervoltage closing mechanism, which can automatically perform closing operation when there is an undervoltage.

[0004] The purpose of this utility model is achieved as follows:

[0005] A load switch includes a frame. An operating mechanism mounted on the side of the frame controls a grounding shaft, an isolation shaft, and a main shaft on the frame. The grounding shaft drives a grounding blade to rotate, the isolation shaft drives an isolation blade to rotate via an isolation rod, and the main shaft drives a transmission mechanism via a push-pull rod. An arc-extinguishing chamber, the transmission mechanism, and the isolation blade are mounted on the frame via insulators, and the arc-extinguishing chamber and the isolation blade are connected via the transmission mechanism. The transmission mechanism includes a rocker arm 1 and a rocker arm 2, both hinged to a housing in the middle. A push-pull rod is hinged to one end of rocker arm 1, and the other end of rocker arm 1 is hinged to the left end of push plate 3. The right end of push plate 3 is hinged to the left end of push plate 4 and one end of rocker arm 2 on the same shaft. The other end of rocker arm 2 is connected to the housing via a return spring. The right end of push plate 4 is hinged to the top of a pressure rod. The pressure rod presses a conductive plate onto the conductive rod of the arc-extinguishing chamber, and the conductive plate and the isolation blade are electrically connected via a flexible connection.

[0006] Compared with the prior art, the beneficial effects of this utility model are:

[0007] This invention uses a locking electromagnet to sense whether there is undervoltage in the secondary circuit. When there is undervoltage, the energy storage capacitor triggers the undervoltage closing electromagnet to attract its trigger rod, thereby actuating the half shaft to close the circuit. The entire process is automatically controlled without human intervention, realizing the undervoltage automatic closing function, thus ensuring that the primary circuit can be reliably powered. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a load switch based on an undervoltage closing mechanism.

[0009] Figure 2 for Figure 1 A magnified view of part A.

[0010] Figure 3 for Figure 1 A magnified view of section B.

[0011] Figure 4 for Figure 1 The front view.

[0012] Figure 5 for Figure 4 A magnified view of a portion of point C.

[0013] Figure 6 for Figure 4 A magnified view of a portion of point D.

[0014] Figure 7 This is a schematic diagram of the undervoltage closing mechanism of this utility model at the half-shaft.

[0015] Figure 8 This is a circuit diagram of the undervoltage closing mechanism of this utility model.

[0016] Figure 9 for Figure 1 A schematic diagram of the transmission mechanism after removing one side of the housing.

[0017] Figure 10 for Figure 9 A magnified view of a portion at point E. Wherein:

[0018] Operating mechanism 101, half shaft 102, closing electromagnet 103, push plate one 104, latch plate 105, latch plate shaft 106, undervoltage closing electromagnet 107, push plate two 108.

[0019] Locking electromagnet 201, micro switch 202, energy storage capacitor 203;

[0020] Frame 1, Insulator 2, Arc-extinguishing chamber 3, Grounding shaft 4, Grounding knife 5, Isolation shaft 6, Isolation knife 7, Isolation rod 8, Main shaft 9, Push-pull rod 10, Transmission mechanism 11, Main tension spring 12;

[0021] Rocker arm 1 21, rocker arm 22, push plate 3 23, push plate 4 24, return spring 25, pressure rod 26, conductive plate 27, housing 28;

[0022] Arc-shaped groove 291, straight groove 292. Detailed Implementation

[0023] See Figures 1-10 The present invention relates to an undervoltage closing mechanism, which includes a locking electromagnet 201 connected in series in the primary circuit (powered by a bridge rectifier circuit V6). The trigger rod (armature) of the locking electromagnet 201 is directly opposite a micro switch 202. When the secondary circuit is normally powered, the locking electromagnet 201 is in the closed state and triggers the micro switch 202 to operate, and the micro switch 202 is in the open circuit state.

[0024] The microswitch 202 and the undervoltage closing electromagnet 107 are connected in series in the primary circuit (powered by the bridge rectifier circuit V5). Simultaneously, an energy storage capacitor 203 is connected in parallel with the microswitch 202 and the undervoltage closing electromagnet 107. That is, although the filter capacitor 203 and the latching electromagnet 201 are both connected in series in the secondary circuit, they are isolated from each other by the bridge rectifier circuits V5 and V6. This prevents the energy storage capacitor 203 from affecting the response and judgment of the latching electromagnet 201 when an undervoltage occurs in the primary circuit. Furthermore, the energy storage capacitor 203, the microswitch 202, and the undervoltage closing electromagnet 107 are located in the same circuit powered by the bridge rectifier circuit V5, thus triggering the undervoltage closing electromagnet 107 through the energy storage capacitor 203.

[0025] When the secondary circuit is in normal working condition, the micro switch 202 is in the open circuit state, and the energy storage capacitor 203 is charged.

[0026] When the secondary circuit is in an undervoltage state, the locking electromagnet 201, which is in the energized state, loses voltage and becomes unenergized, causing the contact of the micro switch 202 to change from the pressed-in state to the unpressurized state (the micro switch 202 is a normally closed switch; when the contact is pressed in, it is in the open circuit state, and when the contact is not pressed in, it is in the closed circuit state). This causes the open point of the micro switch 202 connected in series with the closing electromagnet 107 to become the closed point, thereby forming a circuit with the energy storage capacitor 203, the micro switch 202, and the undervoltage closing electromagnet 107. The energy storage capacitor 203 supplies power to the undervoltage closing electromagnet 107, which in turn drives the trigger rod (armature) to press down against the push plate 108 and drive the half shaft 102 to rotate. This causes the latch plate 105 on the latch shaft 106 to pass through the notch on the half shaft 102 and release to perform the closing operation.

[0027] The half-shaft 102 is based on the existing technical solution of CN201820104970.X "pre-energy storage mechanism". The half-shaft 102 blocks the buckle plate 105 on the buckle plate shaft 106, and the half-shaft 102 is provided with a notch groove through which the buckle plate 105 can pass. When it is necessary to release the buckle plate 105, the half-shaft 102 is rotated so that the notch groove is upward for the buckle plate 105 to pass through, and the closing operation can be performed. A closing electromagnet 103 is provided next to the half-shaft 102 to receive remote closing commands for cooperative operation. At this time, the closing electromagnet 103 is facing a push plate 104 connected to the half-shaft 102. The innovation of this patent is that an undervoltage closing electromagnet 107 is installed next to the closing electromagnet 103, and the undervoltage closing electromagnet 107 is also facing a push plate 108 fixedly installed on the half-shaft 102 to drive the rotation of the half-shaft 102.

[0028] Based on the above undervoltage closing mechanism, a load switch can be constructed. The load switch includes a frame 1. An operating mechanism 101 installed on the side of the frame 1 controls the grounding shaft 4, the isolation shaft 6, and the main shaft 9 on the frame 1. The grounding shaft 4 drives the grounding blade 5 on it to rotate. The isolation shaft 6 drives the isolation blade 7 to rotate through the isolation rod 8. The main shaft 9 drives the transmission mechanism 11 through the push-pull rod 10. The arc-extinguishing chamber 3, the transmission mechanism 11, and the isolation blade 7 are installed on the frame 1 through the insulator 2, and the arc-extinguishing chamber 3 and the isolation blade 7 are connected through the transmission mechanism 11.

[0029] The transmission mechanism 11 includes a housing 28, which is fixed to the frame 1 by an insulator 2. The push-pull rod 10 is hinged to one end of rocker arm 21. The middle parts of rocker arm 21 and rocker arm 22 are both hinged to the housing 28. The other end of rocker arm 21 is hinged to the left end of push plate 23, and the pin at the hinge point slides in the arc groove 291 on the housing 28. The right end of push plate 23, the left end of push plate 24, and one end of rocker arm 22 are hinged on the same axis, and the other end of rocker arm 22... One end of the return spring 25 is connected to the other end of the housing 28. The right end of the push plate 24 is hinged to the top of the pressure rod 26, and the right end of the push plate 24 is hinged to the pressure rod 26 by a pin. The pin is slidably disposed in the straight groove 292 on the housing 28, and the straight groove 292 is vertically disposed. The pressure rod 26 presses the conductive plate 27 onto the conductive rod of the arc-extinguishing chamber 3, and the conductive plate 27 and the isolation knife 7 are connected by a flexible connecting wire (the flexible connection can be a flexible conductive structure composed of multiple layers of copper foil).

[0030] The working principle of the transmission mechanism 11 of this utility model is as follows: When closing the circuit, the main shaft 9 rotates clockwise. At this time, the push-pull rod 10 moves forward and synchronously drives the rocker arm 21 to move clockwise. Thus, under the action of the push plate 23, the rocker arm 22 is driven to rotate counterclockwise against the elastic force of the return spring 25. At this time, the push plate 23 drives the pressure rod 26 to move downward through the push plate 24, thereby realizing the closing action. When opening the circuit, the quick opening operation can be achieved through the stretched return spring 25.

[0031] The advantages of using the transmission mechanism 11 in this patent are:

[0032] In the initial closing phase of the main shaft 9, a larger closing torque is used to drive a smaller closing stroke, thereby reducing the closing force of the main tension spring 12 of the operating mechanism 101. After closing, the push plates 23 and 24 in the transmission mechanism 11 approach 180°, ensuring sufficient closing force while reducing the force on the main shaft 9. This means that neither the main shaft 9 nor the frame 1 needs special reinforcement to meet the closing operation requirements. After opening, the return spring 25, due to its built-in structure, can directly act on the guide rod of the arc-extinguishing chamber 3, improving the opening performance of the switch.

[0033] In summary, the overall structure of the transmission mechanism 11 is more compact and ingenious. Through the linkage design of the multi-stage push plates 23 and 24, the transmission mechanism of this patent can withstand greater pressure, is less prone to deformation, and has a longer mechanical life and is more reliable.

[0034] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. A load switch, characterized in that: The load switch includes a frame (1). An operating mechanism (101) installed on the side of the frame (1) controls the grounding shaft (4), the isolation shaft (6) and the main shaft (9) on the frame (1). The grounding shaft (4) drives the grounding knife (5) on it to rotate. The isolation shaft (6) drives the isolation knife (7) to rotate through the isolation rod (8). The main shaft (9) drives the transmission mechanism (11) through the push-pull rod (10). The arc-extinguishing chamber (3), the transmission mechanism (11) and the isolation knife (7) are installed on the frame (1) through the insulator (2), and the arc-extinguishing chamber (3) and the isolation knife (7) are connected to each other through the transmission mechanism (11).

2. The load switch according to claim 1, characterized in that: The transmission mechanism (11) includes a rocker arm 1 (21) and a rocker arm 2 (22) both hinged to the housing (28) in the middle. The push-pull rod (10) is hinged to one end of the rocker arm 1 (21), and the other end of the rocker arm 1 (21) is hinged to the left end of the push plate 3 (23). The right end of the push plate 3 (23) is hinged to the left end of the push plate 4 (24) and one end of the rocker arm 2 (22) on the same axis. The other end of the rocker arm 2 (22) is connected to the housing (28) via a return spring (25). The right end of the push plate 4 (24) is hinged to the top of the pressure rod (26). The pressure rod (26) presses the conductive plate (27) onto the conductive rod of the arc-extinguishing chamber (3), and the conductive plate (27) and the isolation knife (7) are connected by a soft connection.

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