A coaxial circuit breaker tripping device

Abstract

The present invention discloses a coaxial circuit breaker tripping device. The tripping trigger device is installed inside the neutral line circuit breaker. The tripping trigger device includes an electromagnetic tripping device and a tripping pendulum. Both the tripping pendulum and the tripping lever of the neutral line circuit breaker are installed on the opening and closing mechanism of the moving and static contacts of the neutral line circuit breaker, and they share a common central axis. One end of the electromagnetic tripping device is arranged close to the tripping pendulum and is used to impact the tripping pendulum to swing. The inter-pole tripping linkage rod extends from the housing of the live line circuit breaker and is inserted into the neutral line circuit breaker, contacting the other end of the tripping pendulum. The tripping lever of the neutral line circuit breaker extends from the housing of the neutral line circuit breaker and is inserted into the tripping and tripping trajectory of the mechanical linkage of the live line circuit breaker. The present invention installs the tripping trigger device on the contact switch mechanism of the neutral line circuit breaker, forming a cross-tripping structure of the live line first and then the neutral line, simplifying the structure, improving the structural compactness, and ensuring the reliability and sensitivity of the tripping and tripping action.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switches, and particularly to a coaxial circuit breaker tripping device. Background Art

[0002] A circuit breaker is an electrical protection component that can quickly cut off the power supply in case of abnormalities. However, during normal operation, accidental tripping can cause unnecessary economic losses. Therefore, it is of great significance to improve the sensitivity and accuracy of the circuit breaker tripping mechanism. Traditional tripping control uses a simple strong electromagnetic force to trigger tripping, and the electromagnetic coil is easily burned out. In addition, for conventional live wire circuit breakers, whether single-phase or three-phase, the tripping device is installed inside each circuit breaker, and the internal structure of the circuit breaker is complex.

[0003] With the development of technology, the new national standard for the working voltage adaptation range of the electronic circuit of the residual current circuit breaker has been strictly limited to 245 - 50 volts, and there is a trend to align with the international 30 volts in the future. Therefore, the traditional electromagnetic tripping force will become increasingly difficult to adapt. In addition, the miniature circuit breaker is the development trend of circuit breakers, constantly pursuing a compact structure and reducing the module number. Especially the proposal of the power-off automatic tripping technology has imposed more stringent requirements on the micro-electromagnetic force tripping. Summary of the Invention

[0004] The purpose of the present invention is to provide a coaxial circuit breaker tripping device, in which the tripping trigger device shared by the live wire circuit breaker and the neutral wire circuit breaker is installed on the contact switch mechanism of the neutral wire circuit breaker, and a common rotating shaft is sleeved with a tripping pendulum for linkage to achieve cross tripping. While simplifying the structure, improving the structural compactness and miniaturization, the reliability and sensitivity of the tripping action are ensured.

[0005] To achieve the above object, the present invention provides the following solution:

[0006] A coaxial circuit breaker tripping device includes a live wire circuit breaker, an inter-pole tripping linkage rod, a mechanical linkage member of the live wire circuit breaker, a neutral wire circuit breaker, a tripping lever of the neutral wire circuit breaker, a moving and static contact opening and closing mechanism of the neutral wire circuit breaker, and a tripping trigger device. The tripping trigger device is installed inside the neutral wire circuit breaker. The tripping trigger device includes an electromagnetic tripping device and a tripping pendulum. Both the tripping pendulum and the tripping lever of the neutral wire circuit breaker are installed on the moving and static contact opening and closing mechanism of the neutral wire circuit breaker, sharing a common central axis. The electromagnetic tripping device is arranged at one end close to the tripping pendulum for hitting the tripping pendulum to swing.

[0007] The inter-pole tripping linkage rod extends out of the housing of the live wire circuit breaker, inserts into the interior of the neutral wire circuit breaker, and contacts the other end of the tripping pendulum; the neutral wire circuit breaker tripping lever extends out of the housing of the neutral wire circuit breaker, inserts into the tripping and tripping trajectory of the mechanical linkage of the live wire circuit breaker, constituting a cross-tripping structure with the live wire tripping first and then the neutral wire.

[0008] Further, the electromagnetic tripping device is a cold electromagnetic tripping device, and the cold electromagnetic tripping device A includes a cold tripping permanent magnet static core, a cold tripping moving core, a tripping impact energy storage spring, a cold tripping firing pin, and a cold electromagnetic coil;

[0009] The cold electromagnetic coil is wound on the cold electromagnetic coil skeleton, the cold tripping moving core is movably arranged in the shaft hole of the cold electromagnetic coil skeleton, the cold tripping permanent magnet static core is fixedly embedded at one end of the cold electromagnetic coil skeleton, the cold tripping firing pin is arranged at the other end of the cold electromagnetic coil skeleton and is fixedly connected to the cold tripping moving core, the tripping impact energy storage spring is connected between the cold tripping firing pin and the cold electromagnetic coil skeleton, and the tripping impact energy storage spring is sleeved on the cold tripping moving core;

[0010] The hook on the cold tripping firing pin is connected to the tripping pendulum hook, the cold electromagnetic coil is connected with a control circuit, the control circuit changes the current direction and magnitude of the cold electromagnetic coil, so that the permanent magnetic force of the cold tripping permanent magnet static core and the mechanical force of the tripping impact energy storage spring lose the suction balance, the tripping impact energy storage spring pushes the cold tripping firing pin to impact the tripping pendulum, and the tripping pendulum then impacts the inter-pole tripping linkage rod to trip and cut off the live wire circuit breaker.

[0011] Further, a groove is arranged inside the cold tripping firing pin, and a clamping groove is arranged outside. The tripping impact energy storage spring is arranged in the groove, one end is connected to the cold electromagnetic coil skeleton, and the other end is connected to the cold tripping firing pin; the cold tripping firing pin is connected with an automatic reset rod, one end of the automatic reset rod is clamped in the clamping groove, and the other end is rotatably arranged at a position close to the opening and closing mechanism of the moving and static contacts of the neutral wire circuit breaker;

[0012] When the live wire circuit breaker trips and cuts off, during the tripping process of the mechanical linkage of the live wire circuit breaker, it touches the tripping lever of the neutral wire circuit breaker, causing the opening and closing mechanism of the moving and static contacts of the neutral wire circuit breaker to trip and separate. The opening and closing mechanism of the moving and static contacts of the neutral wire circuit breaker automatically touches the automatic reset rod, causing it to swing to the left, pressing the cold tripping firing pin back into the magnetic field range of the cold tripping permanent magnet static core, and the hook on the cold tripping firing pin pulls back the tripping pendulum.

[0013] Further, the electromagnetic tripping device is a thermal electromagnetic tripping device, and the thermal electromagnetic tripping device includes a thermal electromagnetic coil, a thermal tripping electromagnetic static iron core, a thermal tripping moving iron core, a thermal tripping striker, and a return spring; the thermal electromagnetic coil is wound around a thermal electromagnetic coil skeleton, the thermal tripping electromagnetic static iron core is fixedly embedded at one end of the thermal electromagnetic coil skeleton, the thermal tripping moving iron core is movably arranged in the axial hole of the thermal electromagnetic coil skeleton, the thermal tripping moving iron core and the thermal tripping striker are cast together, the thermal tripping striker passes through the thermal tripping electromagnetic static iron core and is close to the tripping pendulum; the return spring is sleeved on the thermal tripping striker and is located between the thermal tripping electromagnetic static iron core and the thermal tripping moving iron core;

[0014] The thermal electromagnetic coil is connected with a control circuit, and the control circuit changes the current direction and magnitude of the thermal electromagnetic coil, so that the thermal tripping electromagnetic static iron core and the thermal tripping moving iron core are attracted and act, compressing the return spring, and the thermal tripping striker impacts the tripping pendulum; when the thermal electromagnetic coil loses power and after the impact is completed, the thermal tripping moving iron core and the thermal tripping striker are pushed back to the reset position by the return spring to prepare for the next tripping impact.

[0015] Further, the electromagnetic tripping device further includes a manual reset button, the manual reset button is arranged at a position close to the inter-pole tripping linkage rod, one end of the manual reset button is provided with a reset hook, the reset hook hooks the inter-pole tripping linkage rod and is located between the inter-pole tripping linkage rod and the tripping pendulum, and the other end of the manual reset button passes through the housing of the neutral line circuit breaker; barbs are arranged on the manual reset button, and after the manual reset button and the inter-pole tripping linkage rod are impacted by the tripping pendulum, the barbs are stuck on the housing, so that the manual reset button stays at the tripping position.

[0016] Further, the tripping pendulum is a thermal tripping pendulum, and a convex platform for receiving the impact force is arranged on one side of the thermal tripping pendulum close to the thermal tripping striker.

[0017] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the coaxial circuit breaker tripping device provided by the present invention is provided with a tripping pendulum sharing a common central axis on the basis of the opening and closing mechanism of the static and dynamic contacts of the neutral line circuit breaker, and has the following technical advantages:

[0018] First, the tripping pendulum, as a transmission structure between the electromagnetic tripping device and the inter-pole tripping linkage rod, makes micro-electromagnetic tripping possible, because the structure basically does not lose the tripping impact force. When the circuit breaker suddenly loses power, the residual electric energy of the filter capacitor in the electronic circuit can be used to trip the two circuit breakers of the neutral line and the live line. In particular, the new national standard has relaxed the working voltage adaptation range of the electronic circuit of the leakage protection circuit breaker to 245-50 volts, and there is a trend to align with the international 30 volts in the future. The electromagnetic tripping force will become smaller and smaller. This device can adapt to the trend and demand of technological reform;

[0019] Second, the live circuit breaker and the neutral circuit breaker share a tripping trigger device, which is installed in the neutral circuit breaker, which simplifies the structure and makes it compact. Within a module of 18 mm, a common central axis can be used to assemble the moving and static contact switch mechanism of the neutral circuit breaker, the neutral circuit breaker tripping lever, and the live circuit breaker tripping impact pendulum together to achieve structural integration. In particular, the axis of the common central axis and the opening and closing tripping mechanism of each pole circuit breaker are concentrically designed;

[0020] Third, the mutual cooperation between the inter-pole tripping linkage rod and the neutral line circuit breaker tripping lever allows the neutral line circuit breaker and the live line circuit breaker to cross-trip, and the neutral line circuit breaker's first-on, then-off function is smoothly realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a cold tripping working principle diagram of the coaxial circuit breaker tripping device of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the cold electromagnetic tripping device of the present invention;

[0024] Figure 3 It is a working principle diagram of thermal tripping of the coaxial circuit breaker tripping device of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the thermal electromagnetic tripping device of the present invention;

[0026] Figure 5 It is a cross tripping working principle diagram of the coaxial circuit breaker tripping device of the present invention;

[0027] Figure 6 This is a working principle diagram of the automatic cold tripping of the power outage and phase loss of the present invention;

[0028] Figure 7 This is the working schematic diagram of the cold tripping of the three-phase circuit breaker of the present invention during power outage and single-phase loss.

[0029] Figure 8 This is the working schematic diagram of the thermal tripping of the leakage protection circuit breaker of the present invention.

[0030] Figure 9 This is the working schematic diagram of the thermal tripping of the three-phase leakage protection circuit breaker of the present invention.

[0031] Reference numerals: 1, live wire circuit breaker; 2, inter-pole tripping linkage rod; 3, mechanical linkage of the live wire circuit breaker; 4, neutral wire circuit breaker; 5, electromagnetic tripping device; 5A, cold electromagnetic tripping device; 5B, thermal electromagnetic tripping device; 6, tripping pendulum; 6A, cold tripping pendulum; 6B, thermal tripping pendulum; 7, tripping lever of the neutral wire circuit breaker; 8, opening and closing mechanism of the moving and static contacts of the neutral wire circuit breaker; 9, static iron core of the cold tripping permanent magnet; 10, moving iron core of the cold tripping; 11, tripping impact energy storage spring; 12, cold tripping striker; 12-1, hook; 13 - automatic reset rod; 14A, cold electromagnetic coil; 14-1A, skeleton of the cold electromagnetic coil; 14B, thermal electromagnetic coil; 14-1B, skeleton of the thermal electromagnetic coil; 15, static iron core of the thermal tripping electromagnet; 16, moving iron core of the thermal tripping; 17, thermal tripping striker; 18, reset spring; 19, manual reset button; M - common central axis; N - barb; 20, cold tripping electronic circuit board; 21, filter capacitor; 22, upper port power monitoring wire; 23, leakage protection electronic circuit board; 24, zero-type current transformer; 25, power cable of the zero-type current transformer. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] The purpose of the present invention is to provide a coaxial circuit breaker tripping device, which installs the tripping triggering devices of both the live wire circuit breaker and the neutral wire circuit breaker on the contact switch mechanism of the neutral wire circuit breaker and shares a common rotating shaft. When an abnormality occurs and it is necessary to cut off the live wire and neutral wire circuits, the tripping device first cuts off the live wire circuit breaker. After the live wire circuit breaker trips, the mechanical linkage of the live wire circuit breaker drives the neutral wire circuit breaker to trip.

[0034] To make the above objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] As Figures 1 to 9 shown, a coaxial circuit breaker tripping device provided by the present invention includes a live wire circuit breaker 1, an inter-pole tripping linkage rod 2, a mechanical linkage member 3 of the live wire circuit breaker, a neutral wire circuit breaker 4, a neutral wire circuit breaker tripping lever 7, a moving and static contact opening and closing mechanism 8 of the neutral wire circuit breaker, and a tripping trigger device. The tripping trigger device is installed inside the neutral wire circuit breaker 4. The tripping trigger device includes an electromagnetic tripping device 5 and a tripping pendulum 6. The tripping pendulum 6 and the neutral wire circuit breaker tripping lever 7 are both installed on the moving and static contact opening and closing mechanism 8 of the neutral wire circuit breaker, sharing a common central axis M. One end of the electromagnetic tripping device 5 is arranged close to the tripping pendulum 6 for hitting the tripping pendulum 6 to swing;

[0036] The inter-pole tripping linkage rod 2 extends out of the housing of the live wire circuit breaker 1 and is inserted into the neutral wire circuit breaker 4 to contact the other end of the tripping pendulum 6; the neutral wire circuit breaker tripping lever 7 extends out of the housing of the neutral wire circuit breaker 4 and is inserted into the tripping and tripping trajectory of the mechanical linkage member 3 of the live wire circuit breaker, forming a cross-tripping structure of the live wire first and then the neutral wire, as Figure 5 shown.

[0037] A large space is reserved below the electromagnetic tripping device 5 for placing different electronic circuits and microprocessors for different protection functions or intelligent requirements. The common feature of these electronic control units is that they will generate a tripping command output to make the moving iron core of the above electromagnetic tripping device 5 act, hitting the tripping pendulum 6 to swing. The tripping pendulum 6 swings around the common central axis M, and the tripping pendulum 6 transmits this striking force to the inter-pole tripping linkage rod 2 with almost no loss, resulting in the tripping and tripping of the live wire circuit breaker 1. The tripping of the live wire circuit breaker drives the neutral wire circuit breaker 4 to trip and trip through the neutral wire circuit breaker tripping lever 7.

[0038] Embodiment 1

[0039] As Figure 1 and Figure 2 shown, the electromagnetic tripping device 5 is a cold electromagnetic tripping device 5A. The cold electromagnetic tripping device 5A includes a cold tripping permanent magnet static iron core 9, a cold tripping moving iron core 10, a tripping impact energy storage spring 11, a cold tripping firing pin 12, and a cold electromagnetic coil 14A;

[0040] The cold electromagnetic coil 14A is wound around the cold electromagnetic coil skeleton 14-1A. The cold tripping moving iron core 10 is movably arranged in the axial hole of the cold electromagnetic coil skeleton 14-1A. The cold tripping permanent magnet static iron core 9 is fixedly embedded at one end of the cold electromagnetic coil skeleton 14-1A. The cold tripping striker 12 is arranged at the other end of the cold electromagnetic coil skeleton 14-1A and is fixedly connected to the cold tripping moving iron core 10. A tripping impact energy storage spring 11 is connected between the cold tripping striker 12 and the cold electromagnetic coil skeleton 14-1A, and the tripping impact energy storage spring 11 is sleeved on the cold tripping moving iron core 10;

[0041] The hook 12-1 on the cold tripping striker 12 is connected to the hook of the tripping pendulum 6. The cold electromagnetic coil 14A is connected with a control circuit. The control circuit changes the current direction and magnitude of the cold electromagnetic coil 14A. Only a very small amount of DC electrical energy is required to trigger the tripping of the live wire circuit breaker, so that the permanent magnetic force of the cold tripping permanent magnet static iron core 9 and the mechanical force of the tripping impact energy storage spring 11 lose the suction balance. The tripping impact energy storage spring 11 pushes the cold tripping striker 12 to impact the tripping pendulum 6, and the tripping pendulum 6 then impacts the inter-pole tripping linkage rod 2 to trip the live wire circuit breaker 1.

[0042] A groove is arranged inside the cold tripping striker 12, and a card slot is arranged outside. The tripping impact energy storage spring 11 is arranged in the groove, with one end connected to the cold electromagnetic coil skeleton (14-1A) and the other end connected to the cold tripping striker 12; The cold tripping striker 12 is connected with an automatic reset rod 13. One end of the automatic reset rod 13 is clamped in the card slot, and the other end is rotatably arranged at a position close to the opening and closing mechanism 8 of the moving and static contacts of the neutral wire circuit breaker. The automatic reset rod 13 is linked with the opening and closing mechanism 8 of the moving and static contacts of the neutral wire circuit breaker. A protrusion is arranged at a position of the opening and closing mechanism 8 of the moving and static contacts of the neutral wire circuit breaker close to the automatic reset rod 13. The protrusion is used to push the automatic reset rod 13 to move leftward during the tripping action;

[0043] When the live wire circuit breaker 1 trips, during the tripping process of the mechanical linkage part 3 of the live wire circuit breaker, it touches the tripping lever 7 of the neutral wire circuit breaker, causing the opening and closing mechanism 8 of the moving and static contacts of the neutral wire circuit breaker to trip and separate. The opening and closing mechanism 8 of the moving and static contacts of the neutral wire circuit breaker automatically touches the automatic reset rod 13, causing it to swing leftward, pressing the cold tripping striker 12 back into the magnetic field range of the cold tripping permanent magnet static iron core 9, and the hook on the cold tripping striker 12 pulls back the tripping pendulum 6. Among them, the tripping pendulum 6 is the cold tripping pendulum 6A, adopting Figure 1 the shape in, having a hole convenient for the hook 12-1 to hook, and a connecting rod for impacting the cold tripping striker 12.

[0044] AsFigure 6 and Figure 7 As shown in Figure 7 , in the cold trip embodiment, the control circuit includes a cold trip electronic circuit board 20, a filter capacitor 21, and an upper power supply monitoring wire 22. Its working principle is as follows: When the upper power supply monitoring wire 22 detects an abnormal power failure of the upper power supply or a single-phase power supply shortage in a three-phase power supply, it is necessary to make the live wire circuit breaker 1 and the neutral wire circuit breaker 4 automatically trip. The difficulty lies in that the working power supply of the electronic circuit is also cut off at the same time. At this time, only the filter capacitor 21 still has a little residual electrical energy. Under normal circumstances, this stored energy is not enough to push the two circuit breakers to trip. The coaxial trip mechanism and the permanent magnet energy storage solution given by the present invention solve this problem well. Its working sequence is as follows: When the upper power supply fails and the power is cut off or a single-phase power supply shortage occurs in the three-phase power supply, the cold trip electronic circuit board 20 drives the filter capacitor 21 to supply the residual electrical energy to the cold trip electromagnetic coil 14A. The cold trip electromagnetic coil 14A obtains an electromagnetic force opposite to the permanent magnetic force, which destroys the suction balance between the permanent magnetic force and the spring force, so that the cold trip moving iron core 10 drives the cold trip striker 12 to strike the cold trip pendulum 6A under the action of the trip impact energy storage spring 11. The cold trip pendulum 6A transmits this impact force to the inter-pole trip linkage rod 2, causing the live wire circuit breaker 1 to trip. Near the end of this process, the mechanical linkage 3 of the live wire circuit breaker drives the trip lever 7 of the neutral wire circuit breaker, causing the neutral wire circuit breaker 4 to trip. During the tripping process of the neutral wire circuit breaker 4, the opening and closing mechanism 8 of the static and moving contacts of the neutral wire circuit breaker touches the automatic reset lever 13 and swings to the left. The left swing action of the automatic reset lever 13 presses the cold trip striker 12, the trip impact energy storage spring 11, and the cold trip moving iron core 10 back into the magnetic field range of the permanent magnet static iron core 9 and attracts them. The hook 12-1 of the cold trip striker 12 pulls the cold trip pendulum 6A back to its original position at the same time, ensuring the execution of the next strike and trip action.

[0045] The cold trip means that the residual electrical energy of the filter capacitor 21 will not cause the cold trip electromagnetic coil 14A to heat up due to the discharge of the cold electromagnetic trip device 5A. It is relative to the thermal trip embodiment of the leakage protection circuit breaker. The latter, such as Figure 8 and Figure 9Among them, the principle of the thermal trip means that when a leakage fault occurs, the power supply at the upper port of the entire residual current circuit breaker remains intact. The residual current protection electronic circuit board outputs all the energy of the power supply at the upper port to the thermal electromagnetic trip device, causing the circuit breaker to cut off the power supply and trip. This will inevitably cause the temperature of the electromagnetic coil to rise. The electrical industry standard compulsorily stipulates that the power supply voltage fluctuation range at the upper port of the residual current circuit breaker is from +10% of the rated voltage to 50 V (245 V - 50 V), and there is a tendency to converge towards the 30 V international standard. At the same time, it is also stipulated that the coil cannot be burned out under the condition of continuous operation 50 times. Such a standard will force the designers of residual current protectors to make the tripping energy as low as possible to ensure smooth tripping under the 50 V low-voltage state. The application of the coaxial trip device given in the present invention in the embodiment of the residual current circuit breaker can fully meet the above requirements.

[0046] Embodiment 2

[0047] As Figure 3 and Figure 4 shown, the electromagnetic trip device 5 is a thermal electromagnetic trip device 5B. The thermal electromagnetic trip device 5B includes a thermal electromagnetic coil 14B, a thermal trip electromagnetic static iron core 15, a thermal trip moving iron core 16, a thermal trip striker 17, and a return spring 18; the thermal electromagnetic coil 14B is wound on a thermal electromagnetic coil skeleton 14-1B, the thermal trip electromagnetic static iron core 15 is fixedly embedded at one end of the thermal electromagnetic coil skeleton 14-1B, the thermal trip moving iron core 16 is movably arranged in the axial hole of the thermal electromagnetic coil skeleton 14-1B, the thermal trip moving iron core 16 and the thermal trip striker 17 are cast together, the thermal trip striker 17 passes through the thermal trip electromagnetic static iron core 15 and is close to the trip pendulum 6; the return spring 18 is sleeved on the thermal trip striker 17 and is located between the thermal trip electromagnetic static iron core 15 and the thermal trip moving iron core 16;

[0048] The thermal electromagnetic coil 14B is connected to a control circuit. The control circuit changes the current direction and magnitude of the thermal electromagnetic coil 14B, causing the thermal trip electromagnetic static iron core 15 and the thermal trip moving iron core 16 to attract and act, compressing the return spring 18, and the thermal trip striker 17 to strike the trip pendulum 6; when the thermal electromagnetic coil 14B loses power and after the strike is completed, the thermal trip moving iron core 16 and the thermal trip striker 17 are pushed back to their original positions by the return spring 18, preparing for the next trip strike.

[0049] Among them, the electromagnetic tripping device 5 further includes a manual reset button 19, which is arranged near the inter-pole tripping linkage rod 2. One end of the manual reset button 19 is provided with a reset hook, which hooks the inter-pole tripping linkage rod 2 and is located between the inter-pole tripping linkage rod 2 and the tripping pendulum 6. The other end of the manual reset button 19 passes through the housing of the neutral line circuit breaker 4. A barb N is provided on the manual reset button 19. After the manual reset button 19 and the inter-pole tripping linkage rod 2 are affected by the tripping pendulum 6, the barb N is stuck on the housing, and a structure for clamping the barb, such as a clamping groove, is provided on the housing, so that the manual reset button 19 stays in the tripping position. Only after the leakage fault is eliminated and the manual reset button 19 is manually pressed can the circuit breaker be closed again. Otherwise, the inter-pole tripping linkage rod 2 will touch the hook of the manual reset rod, causing tripping again. Among them, the tripping pendulum 6 is a thermal tripping pendulum 6B, and adopts Figure 3 the shape in, and a convex platform for receiving the impact force is provided on one side of it close to the thermal tripping striker 17.

[0050] Due to the action of the barb N of the manual reset button 19, the manual reset button 19 will stay in the tripping position, making it impossible for the live wire circuit breaker 1 and the neutral line circuit breaker 4 to be closed again before the manual reset button 19 is manually pressed. Only when the manual reset button 19 is manually pressed down, and at the same time the thermal tripping pendulum 6B is pushed back to the position in close contact with the thermal tripping striker 17, can a position for the inter-pole tripping linkage rod 2 to be closed again be reserved.

[0051] The thermal tripping structure given by the present invention can ensure that the circuit breaker trips and opens with the minimum electromagnetic force in the thermal tripping embodiment of the leakage protection circuit breaker. Such as Figure 8 and Figure 9As shown in the figure, the control circuit in this embodiment includes a leakage protection electronic circuit board 23, a zero-phase current transformer 24, and a zero-phase current transformer power cable 25. Its working principle is as follows: When the zero-phase current transformer 24 detects a signal indicating that the leakage current exceeds the standard, the leakage protection electronic circuit board 23 amplifies the signal and generates an electromagnetic output to the thermal electromagnetic coil 14B. The electromagnetic force causes the thermal release moving iron core 16 and the striker thermal release striker 17 to strike the thermal release pendulum 6B. The thermal release pendulum 6B transmits this impact force to the manual reset button 19. The reset hook of the manual reset button 19 pulls the pole disconnection linkage rod 2, causing the live wire circuit breaker 1 to trip and cut off the power. The power supply of the leakage protection electronic circuit board 23 is taken from the lower port of the live wire circuit breaker 1. The tripping of the live wire circuit breaker 1 causes the entire electronic circuit board 23 to lose power, and the output electromagnetic force immediately disappears. The thermal release moving iron core 16 and the striker thermal release striker 17 are also immediately pushed back to their original positions by the reset spring 18. At the same time, due to being pushed, the barbed N configured on the manual reset button 19 causes the entire manual reset button 19 to be stuck on the operating track configured for the manual reset rod on the housing. If the manual reset button 19 is not pressed forcefully, when the live wire circuit breaker 1 is closed again, the pole disconnection linkage rod 2 will touch the hook on the manual reset button 19, causing the reclosure to fail. Only after the fault is eliminated and the manual reset button 19 is pressed manually can the circuit breaker be closed again. When the manual reset button 19 is pressed manually, the thermal release pendulum 6B is also pushed back to its original position, completing the entire thermal release action cycle. The neutral wire circuit breaker 4 is still tripped passively under the action of the neutral wire circuit breaker tripping lever 7, which will not be described here again.

[0052] The coaxial circuit breaker tripping device provided by the present invention sets a tripping pendulum sharing a common central axis on the basis of the opening and closing mechanism of the moving and static contacts of the neutral wire circuit breaker, and has the following technical advantages:

[0053] First, as a transmission structure between the electromagnetic tripping device and the pole disconnection linkage rod, the tripping pendulum enables micro electromagnetic tripping. Because this structure basically does not lose the tripping impact force, when the circuit breaker suddenly loses power, the residual electrical energy of the filter capacitor in the electronic circuit can be used to trip both the neutral wire and the live wire circuit breakers. Especially for the working voltage adaptation range of the electronic circuit of the leakage protection circuit breaker in the new national standard, it has been widened to 245 - 50 volts, and there is a trend to align with 30 volts internationally in the future. The electromagnetic tripping force will become smaller and smaller. This device can conform to the trend and requirements of technological reform.

[0054] Second, a tripping trigger device is shared by the live wire circuit breaker and the neutral wire circuit breaker and installed inside the neutral wire circuit breaker, which simplifies the structure and makes it compact. Within a module of 18 mm, a common central axis can be used to assemble the moving and static contact switching mechanism of the neutral wire circuit breaker, the tripping lever of the neutral wire circuit breaker, and the tripping impact pendulum of the live wire circuit breaker together to achieve structural integration. In particular, the axis of the common central axis and the opening / closing and tripping mechanisms of each pole circuit breaker are concentrically designed;

[0055] Third, the mutual cooperation between the inter-pole tripping linkage rod and the tripping lever of the neutral wire circuit breaker enables the neutral wire circuit breaker and the live wire circuit breaker to trip crosswise, and the function of the neutral wire circuit breaker to turn on first and then off is successfully achieved.

[0056] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts between the various embodiments, reference can be made to each other.

[0057] In this article, specific examples are used to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A coaxial circuit breaker tripping device, comprising a live wire circuit breaker (1), an inter-pole tripping linkage rod (2), a live wire circuit breaker mechanical linkage member (3), a neutral wire circuit breaker (4), a neutral wire circuit breaker tripping lever (7), a neutral wire circuit breaker moving and static contact opening and closing mechanism (8), and a tripping trigger device. Characterized in that, The tripping trigger device is installed inside the neutral wire circuit breaker (4), and the tripping trigger device includes an electromagnetic tripping device (5) and a tripping pendulum (6). The tripping pendulum (6) and the neutral wire circuit breaker tripping lever (7) are both installed on the neutral wire circuit breaker moving and static contact opening and closing mechanism (8), sharing a common central axis (M). One end of the electromagnetic tripping device (5) is arranged close to the tripping pendulum (6) for hitting the tripping pendulum (6) to swing. The inter-pole tripping linkage rod (2) extends out of the housing of the live wire circuit breaker (1) and is inserted into the neutral wire circuit breaker (4) to contact the other end of the tripping pendulum (6). The neutral wire circuit breaker tripping lever (7) extends out of the housing of the neutral wire circuit breaker (4) and is inserted into the tripping and tripping track of the live wire circuit breaker mechanical linkage member (3) to form a cross-tripping structure of the live wire first and then the neutral wire. The electromagnetic tripping device (5) is a cold electromagnetic tripping device (5A), and the cold electromagnetic tripping device (5A) includes a cold tripping permanent magnet static iron core (9), a cold tripping moving iron core (10), a tripping impact energy storage spring (11), a cold tripping striker (12), and a cold electromagnetic coil (14A). The cold electromagnetic coil (14A) is wound around a cold electromagnetic coil skeleton (14-1A). The cold tripping moving iron core (10) is movably arranged in the axial hole of the cold electromagnetic coil skeleton (14-1A). The cold tripping permanent magnet static iron core (9) is fixedly embedded at one end of the cold electromagnetic coil skeleton (14-1A). The cold tripping striker (12) is arranged at the other end of the cold electromagnetic coil skeleton (14-1A) and is fixedly connected to the cold tripping moving iron core (10). A tripping impact energy storage spring (11) is connected between the cold tripping striker (12) and the cold electromagnetic coil skeleton (14-1A), and the tripping impact energy storage spring (11) is sleeved on the cold tripping moving iron core (10). The hook on the cold tripping striker (12) is connected to the hook of the tripping pendulum (6). The cold electromagnetic coil (14A) is connected to a control circuit. The control circuit changes the power-on of the cold electromagnetic coil (14A), so that the permanent magnetic force of the cold tripping permanent magnet static iron core (9) and the mechanical force of the tripping impact energy storage spring (11) lose the suction balance. The tripping impact energy storage spring (11) pushes the cold tripping striker (12) to hit the tripping pendulum (6), and the tripping pendulum (6) then hits the inter-pole tripping linkage rod (2) to trip and trip the live wire circuit breaker (1).

2. The coaxial circuit breaker tripping device according to claim 1, Characterized in that, A groove is provided inside the cold trip striker (12), and a clamping groove is provided outside. The trip impact energy storage spring (11) is arranged in the groove, connected to the cold electromagnetic coil skeleton (14-1A) at one end and connected to the cold trip striker (12) at the other end; the cold trip striker (12) is connected with an automatic reset rod (13), one end of the automatic reset rod (13) is clamped in the clamping groove, and the other end is rotatably arranged at a position close to the opening and closing mechanism (8) of the moving and static contacts of the neutral line circuit breaker. When the live line circuit breaker (1) trips and opens, during the tripping process of the mechanical linkage (3) of the live line circuit breaker, it touches the trip lever (7) of the neutral line circuit breaker, causing the opening and closing mechanism (8) of the moving and static contacts of the neutral line circuit breaker to trip and separate. The opening and closing mechanism (8) of the moving and static contacts of the neutral line circuit breaker automatically touches the automatic reset rod (13), causing it to swing to the left, pressing the cold trip striker (12) back into the magnetic field range of the cold trip permanent magnet static iron core (9), and the hook on the cold trip striker (12) pulls the trip pendulum (6) back.

3. The coaxial circuit breaker trip device according to claim 1, characterized in that the electromagnetic trip device (5) is a thermal electromagnetic trip device (5B), and the thermal electromagnetic trip device (5B) includes a thermal electromagnetic coil (14B), a thermal trip electromagnetic static iron core (15), a thermal trip moving iron core (16), a thermal trip striker (17) and a return spring (18); the thermal electromagnetic coil (14B) is wound around the thermal electromagnetic coil skeleton (14-1B), the thermal trip electromagnetic static iron core (15) is fixedly embedded at one end of the thermal electromagnetic coil skeleton (14-1B), the thermal trip moving iron core (16) is movably arranged in the axial hole of the thermal electromagnetic coil skeleton (14-1B), the thermal trip moving iron core (16) and the thermal trip striker (17) are cast together, the thermal trip striker (17) passes through the thermal trip electromagnetic static iron core (15) and is close to the trip pendulum (6); the return spring (18) is sleeved on the thermal trip striker (17) and is located between the thermal trip electromagnetic static iron core (15) and the thermal trip moving iron core (16); the thermal electromagnetic coil (14B) is connected with a control circuit, and the control circuit changes the power supply of the thermal electromagnetic coil (14B), so that the thermal trip electromagnetic static iron core (15) and the thermal trip moving iron core (16) are attracted and act, compressing the return spring (18), and the thermal trip striker (17) impacts the trip pendulum (6); when the thermal electromagnetic coil (14B) loses power and the trip impact is completed, the thermal trip moving iron core (16) and the thermal trip striker (17) are pushed back to their original positions by the return spring (18) to prepare for the next trip impact.

4. The coaxial circuit breaker trip device according to claim 3, characterized in that The electromagnetic tripping device (5) further includes a manual reset button (19). The manual reset button (19) is arranged at a position close to the inter-pole tripping linkage rod (2). One end of the manual reset button (19) is provided with a reset hook, which hooks the inter-pole tripping linkage rod (2) and is located between the inter-pole tripping linkage rod (2) and the tripping pendulum (6). The other end of the manual reset button (19) passes through the housing of the neutral line circuit breaker (4). A barb (N) is arranged on the manual reset button (19). After the manual reset button (19) and the inter-pole tripping linkage rod (2) are impacted by the tripping pendulum (6), the barb (N) gets stuck on the housing, so that the manual reset button (19) stays at the tripping position.

5. The coaxial circuit breaker tripping device according to claim 3, characterized in that the tripping pendulum (6) is a thermal tripping pendulum (6B), and a convex platform for receiving the impact force is arranged on one side of the thermal tripping pendulum (6B) close to the thermal tripping striker (17).

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