A tripping device for low voltage vacuum circuit breaker

Abstract

The present invention discloses a low-voltage vacuum circuit breaker tripping device, which relates to the technical field of vacuum circuit breakers, and includes an electromagnet, a vacuum interrupter and a tripping mechanism. The electromagnet controls the moving and static contacts in the vacuum interrupter to contact or separate to realize the closing and opening of the circuit. A tripping mechanism is arranged between the electromagnet and the vacuum interrupter, and the tripping mechanism includes a connecting rod assembly, and the connecting rod assembly has a folded state and a relatively straight state. The folded state and the relatively straight state of the connecting rod assembly correspond to the tripping state and the locking state of the tripping mechanism respectively. When an overload or short circuit fault occurs in the circuit, the connecting rod assembly promptly responds by switching from the relatively straight state to the folded state to separate the moving and static contacts in the vacuum interrupter and quickly trip. The low-voltage vacuum circuit breaker tripping device provided by the present invention can timely cut off the fault circuit to realize the protection function, and send a fault alarm signal after tripping to notify the user to perform maintenance in time to prevent the accident from further expanding.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum circuit breakers, in particular to a low-voltage vacuum circuit breaker tripping device. Background Art

[0002] A vacuum circuit breaker currently on the market consists of a vacuum interrupter, a contact spring, a transmission assembly, a permanent magnet mechanism, a reset spring, and a mounting base. The action process is as follows:

[0003] 1) After the permanent magnet mechanism is energized, the moving iron core and the static iron core are closed, driving the transmission assembly to move, thereby pushing the moving and static contacts of the vacuum interrupter to close. At the same time, the contact spring is compressed to provide pressure for the contact, and the reset spring is compressed to store energy.

[0004] 2) When the permanent magnet mechanism loses power, the moving contact of the vacuum interrupter is separated from the static contact under the action of the contact spring and the reset spring, and the moving iron core of the permanent magnet mechanism is reset at the same time.

[0005] Structural problems of current vacuum circuit breakers: When the circuit is overloaded or short-circuited, the vacuum circuit breaker itself is unable to cut off the faulty circuit and can only rely on other protective components for circuit protection. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a low-voltage vacuum circuit breaker tripping device.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A low-voltage vacuum circuit breaker tripping device comprises an electromagnet, a vacuum interrupter and a tripping mechanism. The electromagnet controls the moving and static contacts in the vacuum interrupter to contact or separate to achieve closing and opening of the circuit breaker. A tripping mechanism is arranged between the electromagnet and the vacuum interrupter. The tripping mechanism comprises a connecting rod assembly. The connecting rod assembly has a folded state and a relatively straight state. The folded state and the relatively straight state of the connecting rod assembly correspond to the tripping state and the locking state of the tripping mechanism respectively. When an overload or short circuit fault occurs in the circuit, the connecting rod assembly promptly responds by switching from the relatively straight state to the folded state to separate the moving and static contacts in the vacuum interrupter and quickly trip the circuit breaker.

[0009] Furthermore, the tripping mechanism includes a labor-saving lever assembly, and the tripping mechanism triggers unlocking by the labor-saving lever assembly to quickly transform the connecting rod assembly from a relatively straight state to a folded state, thereby achieving rapid tripping of the circuit breaker.

[0010] Furthermore, the force-saving lever assembly includes a stop rod and a tripping half-shaft, both of which can rotate. The stop rod is configured such that when the connecting rod assembly is in a relatively straight state, the stop rod rotates to abut against the connecting rod assembly to keep the connecting rod assembly in a relatively straight state, and the tripping half-shaft is configured such that when the stop rod presses against the connecting rod assembly in a relatively straight state, it rotates to abut against the stop rod, thereby locking the stop rod.

[0011] Furthermore, the tripping mechanism also includes a mounting plate, a connecting rod and a push rod. The two ends of the connecting rod assembly are respectively hinged to the push rod and the connecting rod. The push rod is transmission-connected to the moving contact end of the vacuum arc extinguishing chamber. The connecting rod is fixedly connected to the mounting plate and is opposite to the electromagnet. The stop rod and the tripping half-shaft are both assembled on the mounting plate. The stop rod rotates around the first pin shaft. The first pin shaft and the tripping half-shaft are respectively located on both sides of the connecting rod assembly.

[0012] Furthermore, the connecting rod assembly includes a first connecting rod and a second connecting rod that are hingedly connected. The first connecting rod is hinged to the connecting rod, the second connecting rod is hinged to the push rod, the push rod and the connecting rod are coaxial, and the stop rod abuts against the first connecting rod. Through the relative movement of the first connecting rod and the second connecting rod, the switching of the connecting rod assembly between the straight state and the folded state is achieved.

[0013] Furthermore, the low-voltage vacuum circuit breaker tripping device also includes a thermal magnetic trigger unit and a traction rod. The moving contact end and the stationary contact end of the vacuum interrupter are respectively connected to a terminal block. The terminal block of the moving contact end of the vacuum interrupter is located between the vacuum interrupter and the tripping mechanism and extends toward the front of the circuit breaker. The terminal block of the stationary contact end of the vacuum interrupter extends toward the rear of the circuit breaker. The thermal magnetic trigger unit is connected to the terminal block of the moving contact end of the vacuum interrupter. The traction rod is placed between the thermal magnetic trigger unit and the tripping mechanism. When the circuit breaker is overloaded or short-circuited, the thermal magnetic trigger unit triggers the traction rod, and the triggered traction rod moves the tripping half-shaft to put the tripping mechanism into a tripping state.

[0014] Furthermore, the thermal magnetic trigger unit includes a thermal trip element and a magnetic trip element. When the circuit breaker is short-circuited, the thermal trip element triggers the traction rod, and when the circuit breaker is overloaded, the magnetic trip element triggers the traction rod.

[0015] Furthermore, the low-voltage vacuum circuit breaker tripping device also includes a reset alarm mechanism, which includes an electromagnet-controlled microswitch, a signal alarm microswitch, and a reset button for driving the connecting rod assembly to reset.

[0016] Furthermore, a reset rod is assembled on the mounting plate, one end of the reset rod abuts against the reset button and the other end abuts against the second connecting rod. By pressing the reset button, the reset rod can convert the connecting rod assembly from a folded state to a relatively straight state.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. When the circuit is overloaded / short-circuited, the low-voltage vacuum circuit breaker tripping device can cut off the faulty circuit in time to achieve the protection function.

[0019] 2. When the circuit is overloaded / short-circuited, the low-voltage vacuum circuit breaker tripping device will send out a fault alarm signal after tripping to notify the user to perform maintenance in time.

[0020] 3. The closing operation can only be performed after the circuit fault is eliminated and the low-voltage vacuum circuit breaker tripping device is manually reset to avoid closing the circuit when the circuit fault has not been eliminated to prevent the accident from further expanding.

[0021] 4. The labor-saving lever has the effect of amplifying the force a thousand times. With the labor-saving lever assembly, only a very small tripping force is required to quickly trip the tripping mechanism, thereby causing the circuit breaker to trip quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a side view of a part of the internal structure of a vacuum circuit breaker according to an embodiment of the present invention;

[0023] Figure 2 is one of the three-dimensional diagrams of the tripping mechanism of the embodiment of the present invention;

[0024] Figure 3 is an exploded view of a tripping mechanism according to an embodiment of the present invention;

[0025] Figure 4 is a second stereoscopic diagram of the tripping mechanism according to an embodiment of the present invention;

[0026] Figure 5 This is one of the installation diagrams of the reset torsion spring of the tripping half shaft;

[0027] Figure 6 This is the second installation diagram of the release half-shaft reset torsion spring;

[0028] Figure 7 This is one of the installation diagrams of the stop rod reset torsion spring;

[0029] Figure 8 This is the second installation diagram of the stop rod reset torsion spring;

[0030] Fig. 9 It is one of the schematic diagrams of the locking state of the tripping mechanism of the embodiment of the present invention;

[0031] Fig.10 This is the second schematic diagram of the locking state of the tripping mechanism of the embodiment of the present invention;

[0032] Fig.11 It is one of the schematic diagrams of the tripping state of the tripping mechanism of the embodiment of the present invention;

[0033] Fig.12 This is the second schematic diagram of the tripping state of the tripping mechanism of the embodiment of the present invention;

[0034] Fig.13 It is the force analysis diagram of the tripping mechanism;

[0035] Fig.14 yes Figure 1 The side view of a portion of the internal structure of the vacuum circuit breaker shown omits a schematic diagram of a reset tension spring;

[0036] Fig.15 This is one of the three-dimensional diagrams of the internal structure of the vacuum circuit breaker according to the embodiment of the present invention;

[0037] Fig.16 is a second stereoscopic diagram of the internal structure of the vacuum circuit breaker according to an embodiment of the present invention;

[0038] Fig.17 It is a three-dimensional diagram of a part of the internal structure of the vacuum circuit breaker according to the embodiment of the present invention. DETAILED DESCRIPTION

[0039] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components. The directions described below are based on Figure 1 As a benchmark.

[0040] See also Figures 1 to 17 A low-voltage vacuum circuit breaker tripping device includes an electromagnet 100, a vacuum interrupter 600 and a tripping mechanism 200. The electromagnet 100 controls the moving and static contacts in the vacuum interrupter 600 to contact or separate through the tripping mechanism 200 to achieve closing and opening. The tripping mechanism 200 includes a connecting rod assembly, which has a folded state and a relatively straight state. The folded state and the relatively straight state of the connecting rod assembly correspond to the tripping state and the locking state of the tripping mechanism 200 respectively. When an overload / short circuit fault occurs in the circuit, the connecting rod assembly promptly responds by switching from the relatively straight state to the folded state to separate the moving and static contacts in the vacuum interrupter 600 and quickly trip. The low voltage described in this article is a voltage not greater than 1500 volts.

[0041] The tripping mechanism 200 includes a labor-saving lever assembly. The tripping mechanism triggers unlocking by the labor-saving lever assembly to quickly transform the connecting rod assembly from a straight state to a folded state, thereby achieving rapid tripping of the circuit breaker.

[0042] See also Figures 2 to 12The force-saving lever assembly includes a stop rod 206 and a trip half-shaft 205. Both the stop rod 206 and the trip half-shaft 205 can rotate. The stop rod 206 is configured to rotate to abut against the connecting rod assembly when the connecting rod assembly is in a relatively straight state to keep the connecting rod assembly in a relatively straight state. The trip half-shaft 205 is configured to abut against the stop rod 206 when the stop rod 206 presses against the connecting rod assembly in a relatively straight state, thereby locking the stop rod 206.

[0043] like Figure 7 and Figure 8 As shown, the stop rod 206 is provided with a stop rod reset torsion spring 210. The stop rod 206 has a tendency to press the connecting rod assembly under the action of the stop rod reset torsion spring 210. Fig. 9 and Fig.10 As shown, the stopper rod 206 presses the connecting rod assembly to a relatively straight state under the action of the stopper rod reset torsion spring 210. The tripping half-shaft 205 is provided with a tripping half-shaft reset torsion spring 212. Under the normal working state of the circuit breaker, the tripping half-shaft 205 presses against the stopper rod 206 under the action of the tripping half-shaft reset torsion spring 212 to keep the stopper rod 206 pressed against the connecting rod assembly. The connecting rod assembly is locked by the stopper rod 206 and cannot move. At this time, the tripping mechanism 200 is in a locked state.

[0044] like Figures 2 to 14 As shown, the tripping mechanism 200 also includes a mounting plate 208, a connecting rod 204 and a push rod 201. The two ends of the connecting rod assembly are respectively hinged to the push rod 201 and the connecting rod 204. One end of the push rod 201 is hinged to the connecting rod assembly, and the other end is transmission-connected to the moving contact end of the vacuum arc chamber 600. The connecting rod 204 is fixedly connected to the mounting plate 208 and is opposite to the electromagnet 100. The stop rod 206 and the tripping half shaft 205 are both assembled on the mounting plate 208. The stop rod 206 rotates around the first pin shaft 211. The first pin shaft 211 and the tripping half shaft 205 are respectively located on both sides of the connecting rod assembly.

[0045] Preferably, the mounting plate 208 is U-shaped, and a through hole is provided in the middle of the mounting plate 208 for the connecting rod 204 to pass through. In order to control the moving track of the push rod 201, a guide plate 209 is installed on the mounting plate 208, and the guide plate 209 is provided with a guide through hole coaxial with the connecting rod 204. The push rod 201 is inserted into the guide through hole of the guide plate 209 and moves axially along the guide through hole. The push rod 201 is coaxial with the connecting rod 204.

[0046] In a specific structure, preferably, Figures 9 to 12As shown, the stop rod 206 is connected to the mounting plate 208 through the first pin shaft 211, the tripping half shaft 205 is located below the first pin shaft 211, and the connecting rod assembly is located between the first pin shaft 211 and the tripping half shaft 205. One end of the stop rod 206 extends toward the tripping half shaft 205. In the normal working state of the circuit breaker, one end of the stop rod 206 abuts against the left side of the tripping half shaft 205, and the tripping half shaft 205 prevents the stop rod 206 from rotating counterclockwise, and the other end of the stop rod 206 presses the connecting rod assembly to a relatively straight state.

[0047] like Figures 2 to 8 As shown, the stop rod reset torsion spring 210 and the trip half shaft reset torsion spring 212 are respectively sleeved on both ends of the first pin shaft, one end of the stop rod reset torsion spring 210 is fixed by the mounting plate, and the other end abuts the stop rod, and one end of the trip half shaft reset torsion spring 212 is fixed by the mounting plate, and the other end abuts the trip half shaft. The action direction of the stop rod reset torsion spring 210 on the stop rod is opposite to the action direction of the trip half shaft reset torsion spring 212 on the trip half shaft.

[0048] like Figure 3 As shown, the tripping half shaft 205 has a notch. When an overload or short circuit occurs in the circuit, the tripping half shaft 205 is moved to a position where the stop rod 206 can enter the notch of the tripping half shaft 205, thereby releasing the restriction of the tripping half shaft 205 on the stop rod 206. Specifically, as Fig.11 and Fig.12 As shown, the release half-shaft 205 is moved until the notch faces upward, at which time the connecting rod assembly switches from a relatively straight state to a folded state, and the stop rod 206 can rotate counterclockwise under the action of the connecting rod assembly and enter the notch of the release half-shaft 205, thereby releasing the restriction of the release half-shaft 205 on the stop rod 206.

[0049] like Figure 3 As shown, the connecting rod assembly includes a first connecting rod 203 and a second connecting rod 202 that are hingedly connected. The first connecting rod 203 and the second connecting rod 202 move relative to each other to switch between a straight state and a folded state of the connecting rod assembly. Figures 9 to 12 As shown, the right end of the first connecting rod 203 is hinged to the connecting rod 204 , the left end of the second connecting rod 202 is hinged to the push rod 201 , and the stop rod 206 abuts against the first connecting rod 203 .

[0050] The critical tripping force F6 for the tripping mechanism to release the tripping state satisfies the following formula:

[0051]

[0052] in,

[0053]

[0054] F1L1=F2L2, F2L3=F4L4, F4L5f=F6L6;

[0055] F6 is the critical tripping force for the tripping mechanism to release the tripping state; L6 is the force arm of F6;

[0056] F4 is the force of the tripping half shaft 205 on the stop rod 206;

[0057] L5 is the force arm of the friction force formed between the stop rod 206 and the trip half shaft 205;

[0058] L4 is the distance between the point of action of the tripping half shaft 205 on the stop rod 206 and the rotation center of the stop rod;

[0059] L3 is the force arm of the first connecting rod 203 acting on the stop rod 206;

[0060] F2 is the force of the stop rod 206 on the first connecting rod 203;

[0061] L2 is the distance between the hinge point of the first link 203 and the connecting rod and the point of action of the stop rod 206 on the first link 203;

[0062] F1 is the reaction force received by the tripping mechanism 200 when the circuit breaker is closed;

[0063] L1 is the force arm of F1;

[0064] f is the friction coefficient between the tripping half shaft 205 and the stop rod 206.

[0065] By adjusting the parameters in the above formula, the size of F1 can be thousands of times that of F6, and the driving force of the traction rod on the tripping half-axle only needs to be greater than F6 to trip the tripping mechanism.

[0066] like Fig.15 and Fig.16As shown, the vacuum circuit breaker described in this embodiment has an isolation plate 900, an electromagnet 100 and a tripping mechanism 200 are located above the isolation plate 900, and a vacuum interrupter 600 is located below the isolation plate 900. The circuit breaker also includes a rotating bracket 400 rotating around a fulcrum 401, the fulcrum 401 is connected to the isolation plate 900, the lower end of the rotating bracket 400 is connected to the moving contact end of the vacuum interrupter 600, and the left end of the push rod 201 is fixed to the upper end of the rotating bracket 400. The electromagnet 100 moves the entire tripping mechanism 200 by pushing the connecting rod 204 in the locked state of the tripping mechanism 200. The push rod 201 moves to the left to make the rotating bracket 400 rotate around the fulcrum 401, thereby driving the moving and static contacts in the vacuum interrupter 600 to contact and realize closing. A reset spring 300 is provided on the circuit breaker, one end of which is connected to the upper end of the rotating bracket 400 and the other end is fixedly connected to the electromagnet 100. When the circuit breaker is closed, the reset tension spring 300 is stretched to store energy.

[0067] When the first connecting rod 203 rotates clockwise, it pushes the stop rod 206 to rotate counterclockwise, and the tripping mechanism 200 enters the tripping state. The reset tension spring 300 automatically retracts and drives the rotating bracket 400 to rotate, thereby causing the push rod 201 to move rightward, and the first connecting rod 203 and the second connecting rod 202 form a folded state.

[0068] Preferably, the low voltage vacuum circuit breaker tripping device further comprises a reset alarm mechanism, which is located above the tripping mechanism 200. Specifically, the reset alarm mechanism comprises an electromagnet-controlled micro switch, a signal alarm micro switch and a reset button for driving the connecting rod assembly to reset.

[0069] The tripping mechanism 200 further includes a reset rod 207, which is hinged to the mounting plate 208 through a pin shaft. The reset rod 207 is preferably a V-shaped rod, and the upper end of the reset rod 207 abuts against the reset button, and the lower end of the reset rod 207 abuts against the second connecting rod 202. When the tripping mechanism 200 needs to be restored from the tripping state to the locking state, the reset button is pressed, and the reset rod 207 rotates clockwise under the action of the reset button, and the lower end of the reset rod 207 presses down the second connecting rod 202, thereby restoring the second connecting rod 202 and the first connecting rod 203 from the folded state to a relatively straight state.

[0070] The low-voltage vacuum circuit breaker tripping device also includes a thermal magnetic trigger unit 500 and a traction rod 700. The moving contact end and the static contact end of the vacuum interrupter are respectively connected to a terminal block 800. The terminal block 800 of the moving contact end of the vacuum interrupter is located between the vacuum interrupter and the tripping mechanism and extends toward the front of the circuit breaker. The terminal block of the static contact end of the vacuum interrupter extends toward the rear of the circuit breaker. The thermal magnetic trigger unit is connected to the terminal block 800 of the moving contact end of the vacuum interrupter. The traction rod 700 is placed between the thermal magnetic trigger unit 500 and the tripping mechanism 200. The traction rod 700 is triggered by the thermal tripping element in case of overload, and by the magnetic tripping element in case of short circuit. The triggered traction rod 700 toggles the tripping half shaft 205 to put the tripping mechanism 200 into a tripping state.

[0071] The thermal trip element is an existing time-delay release with a bimetallic strip, and the magnetic trip element is an existing instantaneous trip element with a yoke and an armature. The armature is connected to a striking rod 501. When the circuit breaker is overloaded, the bimetallic strip of the thermal trip element is deformed by heat and triggers the traction rod 700. When the circuit breaker is short-circuited, the yoke of the magnetic trip element attracts the armature, and the striking rod 501 connected to the armature triggers the traction rod 700. The triggered traction rod 700 toggles the tripping half-shaft 205 to make the tripping mechanism 200 enter the tripping state, thereby causing the push rod 201 to move and trigger the circuit breaker to enter the opening state. At the same time, the signal alarm micro switch outputs an alarm signal to inform the user; the electromagnet control micro switch cuts off the electromagnet control circuit, causing the electromagnet 100 to lose power. After the fault is eliminated, press the reset button by hand to reset the tripping mechanism 200 from the tripping state to the locking state to prepare for the next closing.

[0072] The operating principle of the low-voltage vacuum circuit breaker tripping device provided in this embodiment is:

[0073] 1) When the circuit breaker is overloaded or short-circuited, the traction rod 700 moves the tripping half shaft 205, so that the tripping half shaft 205 rotates to the notch facing upward to cancel the restriction on the stop rod 206, and the reset tension spring 300 resets and retracts to move the push rod 201 toward the connecting rod 204, so that the first connecting rod 203 and the second connecting rod 202 form an upwardly arched folded state. During this process, the first connecting rod 203 rotates clockwise, and the first connecting rod 203 pushes the stop rod 206 to rotate counterclockwise, and the lower end of the stop rod 206 enters the notch of the tripping half shaft 205. At the same time, the electromagnet control micro switch cuts off the electromagnet control circuit, so that the electromagnet 100 loses power, and then the circuit breaker is opened. In addition, the signal alarm micro switch outputs an alarm signal to the user.

[0074] 2) After the fault is eliminated, press the reset button by hand, and the reset button rotates the reset rod 207, and the reset rod 207 presses down the second connecting rod 202, so that the second connecting rod 202 rotates clockwise until it is relatively straight with the first connecting rod 203. At this time, the stop rod 206 automatically rotates clockwise and resets to abut against the first connecting rod 203 under the action of the stop rod reset torsion spring 210, and the tripping half shaft 205 rotates clockwise and resets to abut against the lower end of the stop rod 206 under the action of the tripping half shaft reset torsion spring 212. The electromagnet 100 is energized, the moving iron core pushes the connecting rod 204, and then the tripping mechanism 200 moves to the left, and the rotating bracket 400 rotates under the action of the push rod 201, and then drives the moving contact of the vacuum interrupter 600 to move to abut against the static contact, thereby achieving closing.

[0075] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A low voltage vacuum circuit breaker tripping device, characterized in that: It includes an electromagnet, a vacuum interrupter and a tripping mechanism. The electromagnet controls the moving and static contacts in the vacuum interrupter to contact or separate to realize closing and opening. A tripping mechanism is arranged between the electromagnet and the vacuum interrupter. The tripping mechanism includes a connecting rod assembly. The connecting rod assembly has a folded state and a relatively straight state. The folded state and the relatively straight state of the connecting rod assembly correspond to the tripping state and the locking state of the tripping mechanism respectively. When an overload or short circuit occurs in the circuit, the connecting rod assembly promptly responds and switches from the relatively straight state to the folded state to separate the moving and static contacts in the vacuum interrupter and quickly trip. The locking mechanism includes a labor-saving lever assembly, and the tripping mechanism triggers the unlocking of the labor-saving lever assembly to quickly change the connecting rod assembly from a relatively straight state to a folded state, thereby realizing a rapid tripping of the circuit breaker; the labor-saving lever assembly includes a stop rod and a tripping half-shaft, and both the stop rod and the tripping half-shaft can rotate. The stop rod is configured to rotate to abut against the connecting rod assembly when the connecting rod assembly is in a relatively straight state so that the connecting rod assembly remains in a relatively straight state, and the tripping half-shaft is configured to rotate to abut against the stop rod when the stop rod presses the connecting rod assembly in a relatively straight state, thereby locking the stop rod.

2. The low voltage vacuum circuit breaker tripping device according to claim 1, characterized in that: The stop rod is equipped with a stop rod reset torsion spring, and the stop rod has a tendency to press the connecting rod assembly under the action of the stop rod reset torsion spring; the release half shaft is equipped with a release half shaft reset torsion spring, and the release half shaft presses against the stop rod under the action of the release half shaft reset torsion spring to lock the stop rod.

3. The low voltage vacuum circuit breaker tripping device according to claim 1, characterized in that: The tripping half-shaft has a notch. When an overload / short circuit fault occurs in the circuit, the tripping half-shaft is moved to a position where the stop rod can enter the notch of the tripping half-shaft, thereby releasing the restriction of the tripping half-shaft on the stop rod.

4. The low voltage vacuum circuit breaker tripping device according to claim 1, characterized in that: The tripping mechanism also includes a mounting plate, a connecting rod and a push rod. The two ends of the connecting rod assembly are respectively hinged to the push rod and the connecting rod. The push rod is transmission-connected to the moving contact end of the vacuum arc extinguishing chamber. The connecting rod is fixedly connected to the mounting plate and is opposite to the electromagnet. The stop rod and the tripping half-shaft are both assembled on the mounting plate. The stop rod rotates around the first pin shaft. The first pin shaft and the tripping half-shaft are respectively located on both sides of the connecting rod assembly.

5. The low voltage vacuum circuit breaker tripping device according to claim 4, characterized in that: The connecting rod assembly includes a first connecting rod and a second connecting rod that are hingedly connected. The first connecting rod is hinged to the connecting rod, the second connecting rod is hinged to the push rod, the push rod and the connecting rod are coaxial, and the stop rod abuts against the first connecting rod. The switching of the connecting rod assembly between a straight state and a folded state is achieved through the relative movement of the first connecting rod and the second connecting rod.

6. The low voltage vacuum circuit breaker tripping device according to claim 5, characterized in that: The low-voltage vacuum circuit breaker tripping device also includes a thermal magnetic trigger unit and a traction rod. The moving contact end and the stationary contact end of the vacuum interrupter are respectively connected to a wiring board. The wiring board of the moving contact end of the vacuum interrupter is located between the vacuum interrupter and the tripping mechanism and extends toward the front of the circuit breaker. The wiring board of the stationary contact end of the vacuum interrupter extends toward the rear of the circuit breaker. The thermal magnetic trigger unit is connected to the wiring board of the moving contact end of the vacuum interrupter. The traction rod is placed between the thermal magnetic trigger unit and the tripping mechanism. When the circuit breaker is overloaded or short-circuited, the thermal magnetic trigger unit triggers the traction rod, and the triggered traction rod toggles the tripping half-shaft to put the tripping mechanism into a tripping state.

7. The low voltage vacuum circuit breaker tripping device according to claim 6, characterized in that: The thermal magnetic trigger unit comprises a thermal trip element and a magnetic trip element. When the circuit breaker is short-circuited, the thermal trip element triggers the traction rod, and when the circuit breaker is overloaded, the magnetic trip element triggers the traction rod.

8. The low voltage vacuum circuit breaker tripping device according to claim 5, characterized in that: The low-voltage vacuum circuit breaker tripping device also includes a reset alarm mechanism, which includes an electromagnet-controlled microswitch, a signal alarm microswitch, and a reset button for driving the connecting rod assembly to reset.

9. The low voltage vacuum circuit breaker tripping device according to claim 8, characterized in that: A reset rod is assembled on the mounting plate, one end of the reset rod abuts against the reset button and the other end abuts against the second connecting rod. By pressing the reset button, the reset rod can convert the connecting rod assembly from a folded state to a relatively straight state.

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