A shunt trip device

Abstract

The application discloses a shunt release device, which comprises a shell, a driving assembly installed in the shell, a coil, a static iron core arranged in the coil, a dynamic iron core arranged in the coil and opposite to the static iron core, a permanent magnet close to the static iron core, and a compression spring sleeved on the dynamic iron core, a push rod installed in the shell, an end of the dynamic iron core away from the static iron core arranged on the push rod, and the compression spring arranged between the push rod and the static iron core, a reset assembly installed in the shell, a supporting piece, a rotating knob arranged on the supporting piece, and a pull rod matched with the knob, the lower part of the knob abutting against the push rod, and the upper part of the knob abutting against the pull rod, and a power control assembly installed on the supporting piece, a micro switch and a rotating rod matched with the micro switch. The shunt release device provided by the application can provide larger release force, ensure the safety of power supply and the normal operation of low-voltage switch equipment.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a shunt trip device. Background Technology

[0002] A shunt trip unit is an accessory for remotely controlling the tripping of a circuit breaker.

[0003] In the prior art, it generally includes a housing part and an electromagnetic control part. The electromagnetic control part includes a coil, a stationary iron core disposed in the inner cavity of the coil, and a moving iron core disposed in the inner cavity of the coil. The traction rod of the circuit breaker is connected to the moving iron core through a push rod. When the coil is energized, it drives the moving iron core to move relative to the stationary iron core, thereby pushing the traction rod to cause the circuit breaker to disconnect.

[0004] However, due to their structural characteristics, these shunt trip units often provide relatively small tripping force, which prevents the circuit breaker from disconnecting in a timely manner. Summary of the Invention

[0005] The purpose of this invention is to provide a shunt trip device that can provide a larger tripping force.

[0006] Based on the above problems, the technical solution provided by the present invention is as follows:

[0007] A shunt trip device, comprising:

[0008] shell;

[0009] The drive assembly, which is installed inside the housing, includes a coil, a stationary iron core disposed within the coil, a moving iron core disposed within the coil and opposite to the stationary iron core, a permanent magnet close to the stationary iron core, and a compression spring sleeved on the moving iron core.

[0010] A push rod is installed inside the housing, with one end of the moving iron core away from the stationary iron core disposed on the push rod, and the compression spring located between the push rod and the stationary iron core;

[0011] A reset assembly, installed within the housing, includes a support member, an actuating member rotatably mounted on the support member, and a pull rod cooperating with the actuating member. The lower part of the actuating member abuts against the push rod, and the upper part of the actuating member abuts against the pull rod.

[0012] A power control assembly, mounted on the support, includes a micro switch and a lever that cooperates with the micro switch.

[0013] In some embodiments, the push rod includes a base portion, a push rod portion disposed on the base portion away from the stationary iron core and extending to the outside of the housing, a push portion disposed on the base portion near the stationary iron core and extending upward, and a support portion disposed on the upper end of the base portion, the lower part of the actuating member abutting against the push portion, and the moving iron core being limited on the support portion.

[0014] In some embodiments, the support portion is provided with a limiting groove with an upper opening, the moving iron core is placed in the limiting groove, and limiting members are respectively provided on both sides of the support portion on the moving iron core.

[0015] In some embodiments, the support member includes a first plate extending in a vertical direction and a second plate connected to the upper end of the first plate and extending in a horizontal direction. The second plate has a through groove for the toggle member to extend out. Support arms are respectively provided on both sides of the lower end of the second plate located in the through groove. The toggle member is rotatably mounted on the two support arms. The micro switch and lever are mounted on the first plate.

[0016] In some embodiments, the first plate has a circular boss on the side away from the second plate, and a plurality of positioning posts are provided above the circular boss. One end of the lever is rotatably mounted on the circular boss, and the micro switch is mounted on the plurality of positioning posts.

[0017] In some embodiments, the other end of the lever has a trigger portion extending downward to the outside of the housing, and the middle part of the lever has a contact portion that matches the micro switch.

[0018] In some embodiments, the actuating member includes a rotating part, an actuating part disposed on one side of the rotating part and abutting against the push rod, and a reset part disposed on the other side of the rotating part and extending above the through groove.

[0019] In some embodiments, the pull rod includes a pull rod portion slidably disposed above the second plate, a first pulling portion disposed on one side of the pull rod portion and extending outside the housing, and a second pulling portion disposed on the other side of the pull rod portion and abutting against the reset portion.

[0020] In some embodiments, the housing includes a housing with an opening at the top and a top cover that is detachably disposed at the top of the housing.

[0021] In some embodiments, the lower end of the upper cover is provided with a plurality of buckles in the circumferential direction, and the housing is provided with a plurality of buckle grooves that match the plurality of buckles.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] This shunt trip unit has a compact structure and stable performance. When the circuit breaker needs to trip, the stationary iron core and the moving iron core generate a repulsive force, the compressed spring is released, and the moving iron core is pushed to run horizontally along the inner cavity of the coil, pushing the push rod to release. The push rod pushes the circuit breaker's traction rod to trip the circuit breaker. The structure of the drive assembly is suitable for circuit breakers with larger tripping forces, avoiding the shunt trip unit's failure to trip due to excessive tripping force of the circuit breaker, and ensuring the safety of power supply and the normal operation of low-voltage switchgear. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying 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.

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the shunt trip device of the present invention (without the housing). Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention (without the shell). Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the structure of an embodiment of the present invention (without the outer shell);

[0028] Figure 4 for Figure 3 The left view;

[0029] Figure 5 for Figure 3 Top view;

[0030] Figure 6 for Figure 3 A bottom view;

[0031] Figure 7 This is a schematic diagram of the installation structure of the support member and the actuating member in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the push rod structure in an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the support member in an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of the actuating component in an embodiment of the present invention;

[0035] Figure 11 This is a schematic diagram of the external structure of an embodiment of the present invention;

[0036] in:

[0037] 1. Outer shell; 1-1. Housing; 1-1a. Slide groove; 1-2. Top cover;

[0038] 2. Lever; 2-1. Trigger; 2-2. Contact;

[0039] 3. Coil;

[0040] 4. Static iron core;

[0041] 5. Moving iron core; 5-1. Limiting components;

[0042] 6. Compression spring;

[0043] 7. Push rod; 7-1. Base part; 7-2. Push rod part; 7-3. Pushing part; 7-4. Support part; 7-4a. Limiting groove;

[0044] 8. Support component; 8-1. First plate; 8-1a. Circular boss; 8-1b. Positioning post; 8-2. Second plate; 8-2a. Through slot; 8-2b. Support arm;

[0045] 9. Actuating component; 9-1. Rotating part; 9-2. Actuating part; 9-3. Reset part;

[0046] 10. Pull rod; 10-1. Pull rod part; 10-2. First pulling part; 10-3. Second pulling part;

[0047] 11. Micro switch. Detailed Implementation

[0048] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0049] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 11 The diagram below is a structural schematic of an embodiment of the present invention. It provides a shunt trip device, including a housing 1, a drive assembly, a push rod 7, a reset assembly, and a power control assembly.

[0050] Combination Figure 6The drive assembly, installed inside the housing 1, includes a coil 3, a stationary iron core 4 disposed inside the coil 3, a moving iron core 5 disposed inside the coil 3 and opposite to the stationary iron core 4, a permanent magnet close to the stationary iron core 4, and a compression spring 6 sleeved on the moving iron core 5. Under normal conditions, the stationary iron core 4 and the moving iron core 5 are in an attracted state.

[0051] Push rod 7 is installed inside housing 1. The end of moving iron core 5 away from stationary iron core 4 is set on push rod 7. Compression spring 6 is located between push rod 7 and stationary iron core 4. Under normal conditions, compression spring 6 is in a compressed state.

[0052] The reset assembly, installed inside the housing 1, includes a support member 8, a toggle member 9 rotatably mounted on the support member 8, and a pull rod 10 cooperating with the toggle member 9. The lower part of the toggle member 9 abuts against the push rod 7, and the upper part of the toggle member 9 abuts against the pull rod 10.

[0053] The power control assembly, mounted on the support 8, includes a micro switch 11 and a lever 2 that cooperates with the micro switch 11. The lever 2 activates the micro switch 11 to cut off the power.

[0054] See Figure 8 The push rod 7 includes a base portion 7-1, a push rod portion 7-2 disposed at the end of the base portion 7-1 away from the stationary iron core 4 and extending to the outside of the housing 1, a push portion 7-3 disposed at the end of the base portion 7-1 near the stationary iron core 4 and extending upward, and a support portion 7-4 disposed at the upper end of the base portion 7-1. The lower part of the actuating member 9 abuts against the push portion 7-3, and the moving iron core 5 is limited on the support portion 7-4.

[0055] Specifically, a limiting groove 7-4a with an upper opening is provided on the support part 7-4, the moving iron core 5 is placed in the limiting groove 7-4a, and limiting members 5-1 are respectively provided on both sides of the support part 7-4 on the moving iron core 5. The end of the moving iron core 5 away from the stationary iron core 4 is limited on the push rod 7 by the limiting members 5-1 on both sides.

[0056] See Figure 9 The support member 8 includes a first plate 8-1 extending vertically and a second plate 8-2 connected to the upper end of the first plate 8-1 and extending horizontally. The second plate 8-2 is provided with a through groove 8-2a for the toggle member 9 to extend out. Support arms 8-2b are respectively provided on both sides of the through groove 8-2a at the lower end of the second plate 8-2. The toggle member 9 is rotatably mounted on the two support arms 8-2b. The micro switch 11 and the lever 2 are mounted on the first plate 8-1.

[0057] To facilitate the installation of the micro switch 11 and the lever 2, a circular boss 8-1a is provided on the side of the first plate 8-1 away from the second plate 8-2, and multiple positioning posts 8-1b are provided above the circular boss 8-1a. One end of the lever 2 is rotatably mounted on the circular boss 8-1a, and the micro switch 11 is mounted on the multiple positioning posts 8-1b.

[0058] In this example, the other end of the lever 2 is provided with a trigger part 2-1 extending downward to the outside of the housing 1, and the middle of the lever 2 is provided with a contact part 2-2 that matches the micro switch 11. When the shunt trip is tripped, the circuit breaker shaft is lifted to push the lever 2 so that the micro switch 11 is in the normally closed state and the power is cut off.

[0059] See Figure 10 The actuating member 9 includes a rotating part 9-1, an actuating part 9-2 disposed on one side of the rotating part 9-1 and abutting against the push rod 7, and a reset part 9-3 disposed on the other side of the rotating part 9-1 and extending above the through groove 8-2a.

[0060] The pull rod 10 includes a pull rod portion 10-1 disposed above the second plate 8-2, a first pulling portion 10-2 disposed on one side of the pull rod portion 10-1 and extending to the outside of the housing 1, and a second pulling portion 10-3 disposed on the other side of the pull rod portion 10-1 and abutting against the reset portion 9-3. A groove 1-1a matching the first pulling portion 10-2 is provided on the housing 1. When the shunt trip unit trips, the stationary iron core 4 and the moving iron core 5 generate a repulsive force, the compression spring 6 is released, and the moving iron core 5 is pushed to move horizontally along the inner cavity of the coil 3, pushing the push rod 7 to release. The push rod 7 pushes the circuit breaker's traction rod to trip the circuit breaker. At the same time, the push rod 7 pushes the actuating element 9 to rotate, and the reset part 9-3 pushes the pull rod 10 to move. When the shunt trip unit resets, the circuit breaker's operating handle is operated to close the circuit breaker. When the operating handle is pulled, the pull rod 10 is driven to move. The pull rod 10 pushes the actuating element 9 to rotate, pushing the push rod 7 to move into the inner cavity of the coil, thereby causing the moving iron core 5 to overcome the compression spring 6 and reset the moving iron core 5 and the stationary iron core 4.

[0061] In this example, the outer casing 1 includes a shell 1-1 with an opening at the top and a detachable upper cover 1-2 disposed on the upper end of the shell 1-1. Specifically, the upper cover 1-2 is connected to the shell 1-1 by a snap-fit ​​connection. Multiple snap-fits are provided on the lower circumference of the upper cover 1-2, and multiple snap-fit ​​grooves are provided on the shell 1-1 to match the multiple snap-fits. The connection and fixation between the upper cover 1-2 and the shell 1-1 are achieved through the cooperation of the snap-fits and the snap-fit ​​grooves.

[0062] The working principle of this invention is as follows:

[0063] During the tripping process of the shunt trip unit, when an instruction is received to trip the circuit breaker, the stationary iron core 4 and the moving iron core 5 generate a repulsive force, the compression spring 6 is released, and the moving iron core 5 is pushed to move horizontally along the inner cavity of the coil 3, which indirectly pushes the push rod 7 to release. The push rod 7 pushes the circuit breaker's traction rod, causing the circuit breaker to trip. The circuit breaker's rotating shaft is lifted, pushing the lever 2 to put the micro switch 11 in the normally closed state.

[0064] During the shunt trip reset process, the circuit breaker handle is operated to close the circuit breaker. When the circuit breaker completes the re-clamping and closing action, the shunt trip device can be reset. The circuit breaker operating handle cooperates with the pull rod 10. When the circuit breaker operating handle is pulled, the pull rod 10 is driven to move. The pull rod 10 pushes the actuating element 9 to rotate. The actuating element 9 pushes the push rod 7 to move into the inner cavity of the coil 3. Thus, the push rod 7 pushes the moving iron core 5 to overcome the compression spring 6 and reset the moving iron core 5 and the stationary iron core 4.

[0065] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A shunt trip device, characterized in that, include: shell; The drive assembly, which is installed inside the housing, includes a coil, a stationary iron core disposed within the coil, a moving iron core disposed within the coil and opposite to the stationary iron core, a permanent magnet close to the stationary iron core, and a compression spring sleeved on the moving iron core. A push rod is installed inside the housing, with one end of the moving iron core away from the stationary iron core disposed on the push rod, and the compression spring located between the push rod and the stationary iron core; A reset assembly, installed within the housing, includes a support member, an actuating member rotatably mounted on the support member, and a pull rod cooperating with the actuating member. The lower part of the actuating member abuts against the push rod, and the upper part of the actuating member abuts against the pull rod. A power control assembly, mounted on the support, includes a micro switch and a lever that cooperates with the micro switch; The push rod includes a base portion, a push rod portion disposed on the base portion away from the stationary iron core and extending to the outside of the housing, a pushing portion disposed on the base portion near the stationary iron core and extending upward, and a support portion disposed on the upper end of the base portion. The lower part of the actuating member abuts against the pushing portion, and the moving iron core is limited on the support portion. The support member includes a first plate extending in a vertical direction and a second plate connected to the upper end of the first plate and extending in a horizontal direction. The second plate has a through groove for the toggle part to extend out. Support arms are respectively provided on both sides of the through groove at the lower end of the second plate. The toggle part is rotatably mounted on the two support arms. The micro switch and lever are mounted on the first plate.

2. The shunt trip device according to claim 1, characterized in that: The support part is provided with a limiting groove with an upper opening, the moving iron core is placed in the limiting groove, and limiting members are respectively provided on both sides of the support part on the moving iron core.

3. The shunt trip device according to claim 1, characterized in that: The first plate has a circular boss on the side away from the second plate, and a plurality of positioning posts are provided above the circular boss. One end of the lever is rotatably mounted on the circular boss, and the micro switch is mounted on the plurality of positioning posts.

4. The shunt trip device according to claim 3, characterized in that: The other end of the lever is provided with a trigger portion extending downward to the outside of the housing, and the middle part of the lever is provided with a contact portion that matches the micro switch.

5. The shunt trip device according to claim 1, characterized in that: The actuating component includes a rotating part, an actuating part disposed on one side of the rotating part and abutting against the push rod, and a reset part disposed on the other side of the rotating part and extending above the through groove.

6. The shunt trip device according to claim 5, characterized in that: The pull rod includes a pull rod portion disposed above the second plate, a first pull portion disposed on one side of the pull rod portion and extending outside the housing, and a second pull portion disposed on the other side of the pull rod portion and abutting against the reset portion.

7. The shunt trip device according to claim 1, characterized in that: The outer casing includes a shell with an opening at the top and a detachable top cover disposed at the top of the shell.

8. The shunt trip device according to claim 7, characterized in that: The lower end of the upper cover is provided with multiple buckles in the circumferential direction, and the housing is provided with multiple buckle grooves that match the multiple buckles.

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