Electromagnetic quick release device and circuit breaker thereof

Abstract

The application provides an electromagnetic quick release device and a circuit breaker thereof, and relates to the technical field of low-voltage circuit breakers. The application solves the technical problem that the existing circuit breaker and quick release device are usually independent of the release module, resulting in that the quick release device occupies a large internal space of the circuit breaker. The device comprises a moving iron core, a static iron core, an elastic reset structure, a bracket and a push rod structure. The moving iron core and the static iron core are arranged on both sides of a conductive row of the release module. The elastic reset structure is arranged between the moving iron core and the static iron core. The bracket supports the moving iron core. The push rod structure is supported on a contact module. When the current on the conductive row reaches a trigger value, the moving iron core and the static iron core overcome the elastic reset structure and approach each other under the action of electromagnetic force, so that the moving iron core moves and drives the push rod structure to push a traction rod to rotate to achieve release. The application adopts a clapping type electromagnet structure and is integrated on the release module and the contact module, which is beneficial to compact structure of the circuit breaker.

Description

Technical Field

[0001] This invention relates to the field of low-voltage circuit breaker technology, and in particular to an electromagnetic fast tripping device and circuit breaker thereof that can achieve rapid tripping. Background Technology

[0002] The overcurrent protection function of low-voltage circuit breakers mainly includes short-circuit protection and overload protection. Short-circuit protection usually uses electromagnet devices, which are divided into pull-in type and snap-on type. Large-capacity circuit breakers use snap-on type electromagnet structure, while small-capacity circuit breakers use pull-in type structure. Both structures can achieve a certain multiple of short-circuit protection.

[0003] For thermal-magnetic circuit breakers, the fast tripping device is usually independent of the tripping module and is located at the contact module position. The fast tripping device works directly with the traction rod of the circuit breaker mechanism to achieve fast tripping of large currents.

[0004] The applicant has discovered that the prior art has at least the following technical problems:

[0005] Quick-trip devices are usually separate from the trip unit module, occupying some space and affecting the overall layout of the circuit breaker. Summary of the Invention

[0006] The purpose of this invention is to provide an electromagnetic fast-tripping device and a circuit breaker thereof, which solves the technical problem that in existing circuit breakers, the fast-tripping device is usually independent of the tripping module, resulting in a large space occupied by the fast-tripping device inside the circuit breaker. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an electromagnetic fast tripping device, comprising a moving iron core, a stationary iron core, an elastic reset structure, a bracket, and a push rod structure. The moving and stationary iron cores are disposed on opposite sides of the conductive busbar of the tripping module. The elastic reset structure is disposed between the moving and stationary iron cores. The bracket supports the moving iron core and is connected to the base of the tripping module. The push rod structure is supported on the contact module. When the current on the conductive busbar reaches a trigger value, the moving and stationary iron cores, under the action of electromagnetic force, overcome the elastic reset structure and move closer together, causing the moving iron core to actuate and drive the push rod structure to rotate the traction rod to achieve tripping.

[0008] Furthermore, the elastic reset structure includes a first reset structure, which includes a boss and a reset spring. The boss is disposed on the moving iron core and close to the bottom of the moving iron core. The reset spring is sleeved on the boss. The conductive busbar is provided with a clearance hole, and the reset spring abuts against the stationary iron core through the clearance hole.

[0009] Furthermore, the push rod structure includes a push rod, the contact module has a receiving space, the push rod is located in the receiving space and the bottom of the push rod is rotatably connected to the base, the elastic reset structure includes a second reset structure, the second reset structure is disposed on the side of the push rod away from the moving iron core and the second reset structure is used for the reset of the push rod and the moving iron core, the moving iron core abuts against the push rod, and the top of the push rod extends out of the receiving space and cooperates with the traction rod.

[0010] Furthermore, the push rod has a cantilever portion formed on it, with two cantilever portions located on both sides of the push rod. Each cantilever portion corresponds to a second reset structure. The contact module is provided with a guide groove for cooperating with the cantilever portion, and the moving iron core abuts against the cantilever portion.

[0011] Furthermore, the top of the moving iron core is formed with two push rods extending away from the conductive busbar, and the two push rods respectively abut against the cantilever portion on the corresponding side.

[0012] Furthermore, the stationary iron core is provided with side portions extending toward the moving iron core on both its left and right sides. The free end face of the side portion is an inclined surface and the side portion is inverted trapezoidal. When there is no current on the conductive busbar, there is a gap between the inclined surface of the side portion and the moving iron core.

[0013] Furthermore, pivots are formed on the left and right sides of the moving iron core, and an opening slot is provided on the bracket. The two pivots are respectively inserted into the corresponding opening slots to realize the rotational connection between the moving iron core and the bracket.

[0014] Furthermore, the bracket is provided with a buckle and a claw. The buckle is located near the top of the bracket, and the claw is located at the bottom of the bracket. The claw is inserted into a mating hole on the base, and the buckle is engaged with the base.

[0015] Furthermore, the bimetallic strip of the trip unit module, the stationary iron core, and the conductive busbar are fixedly connected by the connector.

[0016] The present invention provides a circuit breaker, including a trip unit module, a contact module, and the electromagnetic fast trip device. Each conductive bar of the trip unit module is equipped with a moving iron core and a stationary iron core of the electromagnetic fast trip device. The push rod structure of the electromagnetic fast trip device is disposed on the contact module.

[0017] This invention can produce the following technical effects: This invention provides an electromagnetic fast tripping device, which adopts a snap-fit ​​electromagnet structure and is integrated on the tripping module and the contact module, which is beneficial to the compact structure of the circuit breaker. The working process of the device is as follows: When there is current on the conductor bus, a ring magnetic field is generated between the moving iron core and the stationary iron core. When the current on the conductor bus reaches the trigger value, the electromagnetic force between the moving iron core and the stationary iron core increases to overcome the elastic force of the elastic reset structure. The moving iron core moves and can drive the push rod structure to push the traction rod to rotate to achieve tripping. When the current on the conductor bus disappears, the moving iron core is reset under the action of the elastic reset structure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the installation structure of the trip unit module and the contact module; Figure 2 This is a structural diagram of the contact module; Figure 3 This is a structural diagram of the trip unit module; Figure 4 This is a schematic diagram showing the installation location of the electromagnetic quick-release device; Figure 5 This is a schematic diagram of the electromagnetic quick-release device; Figure 6 This is an exploded schematic diagram of an electromagnetic quick-release device; Figure 7 This is a schematic diagram showing the connection between the bracket and the trip unit module base; Figure 8 This is a schematic diagram of the push rod structure; Figure 9 This is a schematic diagram of the electromagnetic quick-release device in its initial position; Figure 10 This is a schematic diagram of the electromagnetic quick-release device driving the traction rod to rotate; Figure 11This is a schematic diagram of an electromagnetic quick-release device installed on a trip unit module with a different structure (another embodiment). Figure 12 yes Figure 11 Explosion diagram of the middle section of the structure.

[0020] In the diagram: 1-Contact module; 101-Guide groove; 2-Mechanism; 201-Traction rod; 3-Static iron core component; 301-Limiting groove; 302-Side part; 4-Push rod; 401-Rotating shaft; 402-Cantilever part; 403-Guide rod; 5-Spring; 6-Trigger module; 601-Base; 602-Conductive busbar; 603-Double metal; 604-Connector; 7-Moving iron core component; 701-Pivot; 702-Top rod part; 703-Boss; 8-Reset spring; 9-Bracket; 901-Opening groove; 902-Snap; 903-Claw; 10-Second static iron core component; 11-Second moving iron core component; 12-Second conductive busbar; 13-Iron core bracket. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] For thermal-magnetic circuit breakers, the fast tripping device is usually separate from the tripping module and located at the stationary contact position, occupying some space and affecting the overall layout of the circuit breaker. Based on this, the present invention provides an electromagnetic fast tripping device, which adopts a snap-fit ​​electromagnet structure and is integrated on the trip unit module and the contact module, which is beneficial for the compact structure of the circuit breaker. The specific structure of the device is as follows: it includes a moving iron core 7, a stationary iron core 3, an elastic reset structure, a bracket 9, and a push rod structure. The moving iron core 7 and the stationary iron core 3 are arranged on both sides of the conductive busbar 602 of the trip unit module 6. The elastic reset structure is arranged between the moving iron core 7 and the stationary iron core 3. The bracket 9 supports the moving iron core 7 and is connected to the base 601 of the trip unit module 6. The bracket 9 is made of insulating material. The push rod structure is supported on the contact module 1. When the current on the conductive busbar 602 reaches the trigger value, the moving iron core 7 and the stationary iron core 3 overcome the elastic reset structure and move closer to each other under the action of electromagnetic force, so that the moving iron core 7 moves and drives the push rod structure to push the traction rod 201 to rotate to achieve tripping. When current flows through the conductive busbar 602, a ring-shaped magnetic field is generated between the moving iron core 7 and the stationary iron core 3. When the current on the conductive busbar 602 reaches the trigger value, the electromagnetic force between the moving iron core 7 and the stationary iron core 3 increases to overcome the elastic force of the elastic reset structure. The moving iron core 7 then moves and drives the push rod structure, causing the push rod structure to push the traction rod 201 to rotate and achieve tripping. When the current on the conductive busbar 602 disappears, the moving iron core 7 resets under the action of the elastic reset structure.

[0023] Regarding the elastic reset structure, the elastic reset structure includes a first reset structure, which includes a boss 703 and a reset spring 8. The boss 703 is disposed on the moving iron core 7 and near the bottom of the moving iron core 7. The reset spring 8 is sleeved on the boss 703. The conductive busbar 602 is provided with a clearance hole, and the reset spring 8 abuts against the stationary iron core 3 through the clearance hole. See also Figure 6 The diagram illustrates the boss 703 and the return spring 8 mounted on the moving iron core 7. The return spring 8 is pressed between the moving iron core 7 and the stationary iron core 3. When the current on the conductive busbar 602 reaches the trigger value, the electromagnetic force between the moving iron core 7 and the stationary iron core 3 increases to overcome the elastic force of the return spring 8. The boss 703 defines the position of the return spring 8 between the moving iron core 7 and the stationary iron core 3.

[0024] Depending on the situation, one or more springs can be installed between the moving iron core 7 and the stationary iron core 3, or springs with different deformation capabilities can be selected to adjust the initial action force value of the moving iron core 7.

[0025] Preferably, a limiting groove 301 is formed on the stationary iron core 3, see [reference]. Figure 6 The diagram shows the limiting groove 301 on the stationary iron core 3, and the reset spring 8 abuts against the groove wall of the limiting groove 301 through the clearance hole.

[0026] Regarding the push rod structure, the push rod structure includes a push rod 4. A receiving space is formed on the contact module 1. The push rod 4 is located within the receiving space, and its bottom is rotatably connected to the base 601. The elastic reset structure includes a second reset structure, which is located on the side of the push rod 4 away from the moving iron core 7 and is used to reset both the push rod 4 and the moving iron core 7. The moving iron core 7 abuts against the push rod 4, and the top of the push rod 4 extends out of the receiving space and cooperates with the traction rod 201. See also... Figure 2 The diagram illustrates the push rod 4 mounted on the contact module 1. (See attached image) Figures 9-10 The diagram illustrates the engagement of the top of the push rod 4 with the traction rod 201. The moving iron core 7 can push the push rod 4 to rotate relative to the contact module 1, causing the top of the push rod 4 to push the traction rod 201. When the moving iron core 7 resets, the push rod 4 resets under the action of the second reset structure. The electromagnetic quick-release device provided by this invention has a simple transmission structure, facilitating rapid release of the mechanism.

[0027] Regarding the contact between the moving iron core 7 and the push rod 4, the specific details are as follows: The push rod 4 has cantilever portions 402 formed on its sides. Two cantilever portions 402 are located on either side of the push rod 4. Each cantilever portion 402 corresponds to a second reset structure. The contact module 1 is provided with guide grooves 101 to cooperate with the cantilever portions 402. The moving iron core 7 abuts against the cantilever portions 402. (See also...) Figure 2 The guide groove 101 is shown in the diagram. (See attached image) Figure 8 The diagram illustrates the cantilever section 402, which is located in the guide groove 101.

[0028] See Figure 5 and Figure 6 The top of the moving iron core 7 forms two push rod portions 702 extending in a direction away from the conductive busbar 602, and the two push rod portions 702 respectively abut against the cantilever portions 402 on the corresponding sides. See Figure 9 and Figure 10 The diagram illustrates the interaction between the push rod portion 702 and the cantilever portion 402. When the current on the conductive busbar 602 reaches the trigger value, the moving iron core 7 actuates, and the two push rod portions 702 respectively press against the cantilever portion 402, causing the push rod 4 to rotate and the second reset structure to be compressed.

[0029] Regarding the second reset structure, the structure can be as follows: (See attached image) Figure 8 A guide rod 403 is provided on the cantilever part 402. The guide rod 403 is away from the moving iron core 7. The spring 5 is sleeved on the guide rod 403 and pressed between the cantilever part 402 and the contact module 1. When the two cantilever parts 402 are pressed and moved, the spring 5 is compressed. When the moving iron core 7 is reset, the spring 5 drives the push rod 4 and the moving iron core 7 to reset.

[0030] Regarding the rotatable connection between the bottom of push rod 4 and base 601, the specific rotatable connection structure is not limited in much detail; existing technology can be used.

[0031] See Figure 6 The stationary iron core 3 has side portions 302 extending towards the moving iron core 7 on both its left and right sides. The free end faces of the side portions 302 are inclined and inverted trapezoidal. When there is no current on the conductive busbar 602, there is a gap between the inclined surfaces of the side portions 302 and the moving iron core 7. See also Figure 6 The diagram illustrates the side portion 302 on the stationary iron core 3. When current flows through the conductive busbar 602, the side portions 302 at both ends of the stationary iron core 3 attract the moving iron core 7. See also... Figure 6 A limiting groove is formed on the conductive busbar 602, and the stationary iron core 3 is located in the limiting groove.

[0032] Regarding the connection structure between the moving iron core 7 and the bracket 9, the preferred configuration is as follows: See Figure 6 The moving iron core 7 has pivots 701 formed on its left and right sides respectively, and the bracket 9 has an opening slot 901. The two pivots 701 are inserted into the corresponding opening slots 901 to achieve a rotatable connection between the moving iron core 7 and the bracket 9. When the current on the conductor 602 reaches the trigger value, the pivot 701 rotates counterclockwise relative to the bracket 9.

[0033] Regarding bracket 9, bracket 9 is equipped with a buckle 902 and a claw 903. Buckle 902 is located near the top of bracket 9, and claw 903 is located at the bottom of bracket 9. Claw 903 is inserted into a mating hole on base 601, and buckle 902 is engaged with base 601. See also Figure 6 The diagram illustrates the latch 902 and claw 903 on the bracket 9. (See attached image) Figure 7 This illustrates that the bracket 9 is connected to the base 601, and the buckle 902 is secured to the base 601 via the moving iron core 7 and the conductive busbar 602.

[0034] For details on fixing the stationary iron core component 3, please refer to [link / reference]. Figure 6 The connector 604 is inserted into the double metal 603, the stationary iron core 3 and the conductive bus 602 of the trip unit module 6 in sequence to fix the stationary iron core 3 on the conductive bus 602. The connector 604 is preferably a rivet.

[0035] The electromagnetic quick-release device provided by this invention operates on the following principle: During normal operation, the push rod 4 and the moving iron core 7 are in a reset state under the action of the spring 5 and the return spring 8. When a short-circuit current is generated in the circuit and reaches the trigger value, the electromagnetic force between the moving iron core 7 and the stationary iron core 3 increases to overcome the spring force, and the moving iron core 7 begins to move. Simultaneously with the rotation of the moving iron core 7, the push rod 702 pushes the cantilever 402, causing the push rod 4 to begin rotating. There is a certain free travel between the push rod 4 and the traction rod 201. After the push rod 4 contacts the traction rod 201, it pushes the traction rod 201 to rotate until the release mechanism 2 is released, causing the contacts to begin actuation, completing the release process. The direction of movement of each component is as follows: Figure 10 As indicated by the arrow. After the short-circuit current is interrupted, the electromagnetic force on the moving iron core 7 disappears, and it is reset under the action of the spring, moving away from the stationary iron core 3 until it reaches the limit position. During this process, the push rod 4 is simultaneously reset under the action of the spring 5, disengaging from the traction rod 201 and returning to the initial state, thus completing the entire action process.

[0036] See Figures 1-10 The diagram illustrates a trip unit module with a specific structure. The electromagnetic fast trip device provided by this invention is installed in this trip unit module. See also... Figure 11 The diagram illustrates a trip unit module with a different structure (only a portion of the structure is shown). The electromagnetic fast trip device provided by this invention is installed in this trip unit module. As this is prior art, the specific structures of the two trip unit modules will not be described in detail here.

[0037] in addition, Figure 11 and Figure 12 The static iron core component 3 and Figures 5-6 The static iron core component 3 in the middle has some differences in shape, and in Figure 11 and Figure 12 In the middle, the connector 604 is inserted into the stationary iron core 3, the double metal 603 and the conductive bus 602 of the trip unit module 6 in sequence to fix the stationary iron core 3 on the conductive bus 602.

[0038] A circuit breaker includes a trip unit module 6, a contact module 1, and an electromagnetic fast tripping device provided by this invention. Each conductive bar 602 of the trip unit module 6 is equipped with a moving iron core 7 and a stationary iron core 3 of the electromagnetic fast tripping device. The push rod structure of the electromagnetic fast tripping device is disposed on the contact module 1. The specific cooperation relationship between the electromagnetic fast tripping device and the trip unit module 6 and the contact module 1 has been described in detail above and will not be repeated here.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An electromagnetic quick-release device, characterized in that, It includes a moving iron core (7), a stationary iron core (3), an elastic reset structure, a bracket (9), and a push rod structure, among which, The moving iron core (7) and the stationary iron core (3) are disposed on both sides of the conductive busbar (602) of the trip unit module (6). The elastic reset structure is disposed between the moving iron core (7) and the stationary iron core (3). The bracket (9) supports the moving iron core (7) and is connected to the base (601) of the trip unit module (6). The push rod structure is supported on the contact module (1). When the current on the conductive busbar (602) reaches the trigger value, the moving iron core (7) and the stationary iron core (3) overcome the elastic reset structure and move closer to each other under the action of electromagnetic force, so that the moving iron core (7) moves and can drive the push rod structure to push the traction rod (201) to rotate to achieve tripping. The push rod structure includes a push rod (4). A receiving space is formed on the contact module (1). The push rod (4) is located in the receiving space and the... The bottom of the push rod (4) is rotatably connected to the base (601). The elastic reset structure includes a second reset structure. The second reset structure is disposed on the side of the push rod (4) away from the moving iron core (7) and is used for the reset of the push rod (4) and the moving iron core (7). The moving iron core (7) abuts against the push rod (4). The top of the push rod (4) extends out of the receiving space and cooperates with the traction rod (201). A cantilever portion (402) is formed on the push rod (4). Two cantilever portions (402) are located on both sides of the push rod (4). Each cantilever portion (402) corresponds to one second reset structure. A guide groove (101) is provided on the contact module (1) to cooperate with the cantilever portion (402). The moving iron core (7) abuts against the cantilever portion (402).

2. The electromagnetic quick-release device according to claim 1, characterized in that, The elastic reset structure includes a first reset structure, which includes a boss (703) and a reset spring (8). The boss (703) is disposed on the moving iron core (7) and close to the bottom of the moving iron core (7). The reset spring (8) is sleeved on the boss (703). The conductive bus (602) is provided with a clearance hole. The reset spring (8) abuts against the stationary iron core (3) through the clearance hole.

3. The electromagnetic quick-release device according to claim 1, characterized in that, The top of the moving iron core (7) forms two top rods (702) extending away from the conductive busbar (602), and the two top rods (702) respectively abut against the cantilever (402) on the corresponding side.

4. The electromagnetic quick-release device according to claim 1, characterized in that, The stationary iron core (3) has side portions (302) extending toward the moving iron core (7) on its left and right sides. The free end face of the side portion (302) is an inclined surface and the side portion (302) is an inverted trapezoid. When there is no current on the conductive bus (602), there is a gap between the inclined surface of the side portion (302) and the moving iron core (7).

5. The electromagnetic quick-release device according to claim 1, characterized in that, The moving iron core (7) has pivots (701) formed on its left and right sides respectively. The bracket (9) is provided with an opening slot (901). The two pivots (701) are inserted into the corresponding opening slots (901) respectively to realize the rotational connection between the moving iron core (7) and the bracket (9).

6. The electromagnetic quick-release device according to claim 1, characterized in that, The bracket (9) is provided with a buckle (902) and a claw (903). The buckle (902) is close to the top of the bracket (9), and the claw (903) is located at the bottom of the bracket (9). The claw (903) is inserted into the mating hole on the base (601), and the buckle (902) is engaged with the base (601).

7. The electromagnetic quick-release device according to claim 1, characterized in that, The double metal (603) of the trip unit module (6), the stationary iron core (3) and the conductive bus (602) are fixedly connected by a connector (604).

8. A circuit breaker, characterized in that, The device includes a trip unit module (6), a contact module (1), and an electromagnetic fast trip device as described in any one of claims 1-7. Each conductive bar (602) of the trip unit module (6) is equipped with a moving iron core (7) and a stationary iron core (3) of the electromagnetic fast trip device. The push rod structure of the electromagnetic fast trip device is disposed on the contact module (1).

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