Undervoltage closing mechanism

Abstract

The utility model relates to an under-voltage closing mechanism, which comprises a latching electromagnet (201) connected in series on a primary loop, a trigger rod of the latching electromagnet (201) directly faces a microswitch (202), and the microswitch (202) is in an open circuit state; the microswitch (202) and the under-voltage closing electromagnet (107) are connected in series and then connected to a primary loop in series, an energy storage capacitor (203) is connected with the microswitch (202) and the under-voltage closing electromagnet (107) which are connected in series in parallel, and the under-voltage closing electromagnet (107) drives the half shaft (102) to rotate through a second push plate (108) installed on the half shaft (102). The under-voltage switching-on mechanism provided by the utility model can automatically carry out switching-on operation in an under-voltage state.

Description

Technical Field

[0001] The utility model relates to an undervoltage closing mechanism, belonging to the technical field of electrical engineering. Background Art

[0002] At present, during the application process, load switches / circuit breakers are quickly closed through pre-energy storage mechanisms, such as the Chinese patent CN201820104970.X "Pre-energy storage mechanism" declared by our company, which drives the half-shaft to rotate through the closing electromagnet, and then releases the buckle plate on the buckle shaft to achieve rapid closing. This type of pre-energy storage mechanism is generally set to undervoltage tripping when undervoltage occurs, such as the "A circuit breaker undervoltage tripping mechanism" disclosed in Chinese patent CN201420394183.5. When the primary circuit is undervoltage, the tripping operation is performed, so manual closing is required before normal operation can be resumed. For this reason, some users have proposed to design a device with an automatic closing function when the secondary circuit is undervoltage, so as to ensure that the primary circuit can be reliably powered. Utility Model Content

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an undervoltage closing mechanism which can automatically perform a closing operation in the event of undervoltage.

[0004] The purpose of this utility model is achieved in this way:

[0005] An undervoltage closing mechanism includes a locking electromagnet connected in series to a secondary circuit, a trigger rod of the locking electromagnet facing a microswitch, and the microswitch is in an open circuit state; the microswitch and the undervoltage closing electromagnet are connected in series to the secondary circuit, and a storage capacitor is connected in parallel with the microswitch and the undervoltage closing electromagnet in series. The undervoltage closing electromagnet drives the half shaft to rotate through a push plate 2 installed on the half shaft.

[0006] Preferably, the energy storage capacitor and the locking electromagnet are isolated from each other.

[0007] Preferably, the housings of the locking electromagnet, microswitch and undervoltage closing electromagnet are all fixedly mounted on the operating mechanism, the energy storage capacitor is mounted on the circuit board and then fixed on the operating mechanism, and the energy storage capacitor, microswitch and undervoltage closing electromagnet are connected by wires.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] The utility model uses a locking electromagnet to sense whether there is undervoltage in the secondary circuit. When undervoltage occurs, the energy storage capacitor is used to trigger the undervoltage closing electromagnet to attract its trigger rod, thereby toggling the half-axis to achieve closing. The entire process is automatically controlled without human intervention, realizing the automatic undervoltage closing function, thereby ensuring that the primary circuit can be reliably powered. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of a load switch based on an under-voltage closing mechanism.

[0011] Figure 2 It is Figure 1 a partial enlarged view of part A of

[0012] Figure 3 It is Figure 1 a partial enlarged view of part B of

[0013] Figure 4 It is Figure 1 the front view of

[0014] Figure 5 It is Figure 4 a partial enlarged view of part C of

[0015] Figure 6 It is Figure 4 a partial enlarged view of part D of

[0016] Figure 7 It is a schematic structural diagram of the under-voltage closing mechanism of the present utility model at the half shaft.

[0017] Figure 8 It is a schematic circuit diagram of the under-voltage closing mechanism of the present utility model.

[0018] Figure 9 It is Figure 1 a schematic structural diagram of the drive mechanism of

[0019] Figure 10 It is Figure 9 a partial enlarged view of part E of

[0020] Operating mechanism 101, half shaft 102, closing electromagnet 103, first push plate 104, buckle plate 105, buckle plate shaft 106, under-voltage closing electromagnet 107, second push plate 108;

[0021] Locking electromagnet 201, micro switch 202, energy storage capacitor 203;

[0022] Frame 1, insulator 2, arc extinguishing chamber 3, grounding shaft 4, grounding knife 5, isolating shaft 6, isolating knife 7, isolating rod 8, main shaft 9, push-pull rod 10, drive mechanism 11, main tension spring 12;

[0023] First rocker arm 21, second rocker arm 22, third push plate 23, fourth push plate 24, return spring 25, pressure rod 26, conductive plate 27, housing 28;

[0024] Arc-shaped groove 291, straight groove 292. Specific embodiments

[0025] SeeFigures 1 to 10 The utility model relates to an under-voltage closing mechanism, which includes a locking electromagnet 201 (powered by a bridge rectifier circuit V6) connected in series to the primary circuit. The trigger rod (armature) of the locking electromagnet 201 faces a microswitch 202, and when the secondary circuit is normally powered, the locking electromagnet 201 is in an attracted state to trigger the microswitch 202 to act, and the microswitch 202 is in an open state.

[0026] The microswitch 202 and the under-voltage closing electromagnet 107 are connected in series and then connected in series to the primary circuit (powered by a bridge rectifier circuit V5). At the same time, an energy storage capacitor 203 is connected in parallel with the series-connected microswitch 202 and the under-voltage closing electromagnet 107. That is, although the filter capacitor 203 and the locking electromagnet 201 are both connected in series to the secondary circuit, they are isolated from each other through the bridge rectifier circuits V5 and V6, so as to prevent the energy storage capacitor 203 from supplying power to the locking electromagnet 201 and affecting its response and judgment when the primary circuit has an under-voltage. At the same time, the energy storage capacitor 203, the microswitch 202, and the under-voltage closing electromagnet 107 are located on the same circuit powered by the bridge rectifier circuit V5, so as to trigger and supply power to the under-voltage closing electromagnet 107 through the energy storage capacitor 203.

[0027] When the secondary circuit is in a normal working state, the microswitch 202 is in an open state, and the energy storage capacitor 203 is energized for charging;

[0028] When the secondary circuit is in an under-voltage state, the locking electromagnet 201 in the attracted state loses voltage and becomes an un-attracted state, causing the contact piece of the microswitch 202 to change from the pressed state to the non-pressed state (the microswitch 202 is a normally closed switch, which is in an open state when the contact piece is pressed and in a conducting state when the contact piece is not pressed), so that the open contact of the microswitch 202 connected in series to the closing electromagnet 107 becomes a closed contact, thereby enabling the energy storage capacitor 203, the microswitch 202, and the under-voltage closing electromagnet 107 to form a loop, and supplying power to the under-voltage closing electromagnet 107 through the energy storage capacitor 203. As a result, the under-voltage closing electromagnet 107 drives the trigger rod (armature) to press down on the push plate II 108 and then drives the half shaft 102 to rotate, so that the catch 105 on the catch shaft 106 passes through the notch groove on the half shaft 102 to be released for closing operation.

[0029] The half shaft 102 is an existing technical solution based on CN201820104970.X, "pre - energy storage mechanism". The half shaft 102 blocks the buckle plate 105 on the buckle plate shaft 106, and there is a notch groove on the half shaft 102 through which the buckle plate 105 can pass. When it is necessary to release the buckle plate 105, rotate the half shaft 102 so that the notch groove faces upward to allow the buckle plate 105 to pass through for closing operation. And beside the half shaft 102, there is a closing electromagnet 103 for receiving remote closing instructions for cooperation operation. At this time, the closing electromagnet 103 is directly opposite to a push plate one 104 connected to the half shaft 102. The innovation point of this patent is the introduction of an under - voltage closing electromagnet 107 installed beside the closing electromagnet 103, and the under - voltage closing electromagnet 107 is also directly opposite to a push plate two 108 fixedly installed on the half shaft 102, which is used to drive the rotation of the half shaft 102.

[0030] Based on the above - mentioned under - voltage closing mechanism, a load switch can be constructed. The load switch includes a frame 1. The operating mechanism 101 installed on the side of the frame 1 controls the grounding shaft 4, isolation shaft 6, and 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 insulators 2, and the arc - extinguishing chamber 3 and the isolation knife 7 are connected through the transmission mechanism 11.

[0031] The transmission mechanism 11 includes a housing 28. The housing 28 is fixed to the frame 1 through an insulator 2. The push - pull rod 10 is hinged to one end of the rocker arm one 21. The middle parts of the rocker arm one 21 and the rocker arm two 22 are both hinged to the housing 28. The other end of the rocker arm one 21 is hinged to the left end of the push plate three 23, and the pin shaft at the hinge point slides in the arc - shaped groove 291 on the housing 28. The right end of the push plate three 23, the left end of the push plate four 24, and one end of the rocker arm two 22 are hinged on the same shaft. The other end of the rocker arm two 22 is connected to one end of the return spring 25, and the other end of the return spring 25 is connected to the housing 28. The right end of the push plate four 24 is hinged to the top of the pressure rod 26, and the right end of the push plate four 24 and the pressure rod 26 are hinged through a pin shaft. The pin shaft slides in the straight groove 292 on the housing 28, and the straight groove 292 is vertically arranged. 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 connection wire (this flexible connection can be a flexible conductive structure composed of multiple layers of copper foil).

[0032] The working principle of the transmission mechanism 11 of the utility model is as follows: when closing, the main shaft 9 rotates clockwise. At this time, the push-pull rod 10 moves forward and synchronously drives the first rocker arm 21 to rotate clockwise. Thus, under the action of the third push plate 23, the second rocker arm 22 is driven to rotate counterclockwise against the elastic force of the return spring 25. At this time, the third push plate 23 drives the pressure rod 26 to move downward through the fourth push plate 24, thereby realizing the closing action. When opening, the rapid opening operation can be realized through the stretched return spring 25.

[0033] The advantages of adopting the transmission mechanism 11 in this patent are as follows:

[0034] At the initial stage of closing of the main shaft 9, a relatively large closing torque is used to push a relatively small closing stroke, thereby reducing the closing force of the main tension spring 12 of the operating mechanism 101. After closing, and when the third push plate 23 and the fourth push plate 24 in the transmission mechanism 11 approach 180°, it can not only ensure sufficient closing force but also reduce the force borne by the main shaft 9, so that neither the main shaft 9 nor the frame 1 needs to be specially strengthened to meet the closing operation. After opening, since the return spring 25 adopts an internal structure, it can directly act on the guide rod of the arc extinguishing chamber 3, improving the opening performance of the switch.

[0035] 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 of the third push plate 23 and the fourth push plate 24, the transmission mechanism of this patent can withstand greater pressure, is not easily deformed, has a longer mechanical life and is more reliable.

[0036] In addition: it should be noted that the above specific implementation manner is only an optimized solution of this patent. Any modification or improvement made by those skilled in the art according to the above conceptions is within the protection scope of this patent.

Claims

1. An under-voltage closing mechanism, characterized in that: It includes a latching electromagnet (201) connected in series to the primary circuit. The trigger rod of the latching electromagnet (201) faces a microswitch (202), and the microswitch (202) is in an open state. The microswitch (202) and the under-voltage closing electromagnet (107) are connected in series and then connected in series to the primary circuit. There is an energy storage capacitor (203) connected in parallel with the series-connected microswitch (202) and under-voltage closing electromagnet (107). The under-voltage closing electromagnet (107) drives the half shaft (102) to rotate through a second push plate (108) installed on the half shaft (102).

2. The under-voltage closing mechanism according to claim 1, characterized in that: The energy storage capacitor (203) and the latching electromagnet (201) are isolated from each other.

3. The under-voltage closing mechanism according to claim 1, characterized in that: The housings of the latching electromagnet (201), the microswitch (202), and the under-voltage closing electromagnet (107) are all fixedly installed on the operating mechanism (101). The energy storage capacitor (203) is installed on a circuit board and then fixed on the operating mechanism (101). And the energy storage capacitor (203), the microswitch (202), and the under-voltage closing electromagnet (107) are connected by wires.

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