Magnetic release and circuit breaker

Abstract

The magnetic release comprises an armature, a support, a magnet yoke and a reset spring, the armature is provided with a trigger portion, a hinge portion and a suction portion from top to bottom, the hinge portion is hinged with the support, the magnet yoke is fixed on the support, the suction portion is opposite to the magnet yoke, and the reset spring is connected between the armature and the support. An adjusting screw is arranged on the support and used for adjusting the swing amplitude of the armature, and the adjusting screw abuts against the armature under the elastic force effect of the reset spring in a normal state; according to the utility model, the structure of the magnetic release is optimized, and the swing amplitude of the armature is adjustable (namely, the size of an air gap between the armature and the magnet yoke is adjustable), so that the triggering condition of the release can be accurately controlled, and when a short circuit occurs in the circuit, the adjustable armature ensures that the release can quickly and accurately cut off current to achieve the purpose of protection; and the swing amplitude of the armature is adjustable, so that the universality of the magnetic release is better, and the magnetic release can better meet the diversified requirements of circuit breakers with different specifications.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to a magnetic trip unit and a circuit breaker. Background Technology

[0002] Among low-voltage electrical appliances, molded case circuit breakers are a widely used product, frequently applied in low-voltage power distribution systems. They not only provide power to the distribution lines but also serve the dual purpose of protecting and controlling the circuits, playing a crucial role in the safety, reliability, and practicality of the entire power distribution system.

[0003] In the field of circuit breaker technology, the magnetic trip unit is a key component used to quickly interrupt current in the event of an overload or short circuit in a circuit to protect circuits and equipment. However, existing magnetic trip units have some limitations in design and function, particularly in the adjustment of the armature swing amplitude.

[0004] Most existing magnetic trip units lack the ability to adjust the armature swing amplitude, which directly determines the trip unit's sensitivity and performance. In practical applications, if the armature swing amplitude is too small, the trip unit will be overly sensitive, easily affected by minor current fluctuations or mechanical vibrations, leading to malfunctions and unnecessary power outages. Conversely, if the armature swing amplitude is too large, the trip unit's response speed will significantly decrease, failing to promptly interrupt fault current and thus weakening its protective performance. Furthermore, because the armature swing amplitude is not adjustable, existing magnetic trip units have poor versatility, making it difficult to adapt to the diverse needs of different circuit breaker specifications, thus limiting their widespread application. Utility Model Content

[0005] The purpose of this utility model is to provide a magnetic trip unit with adjustable armature swing amplitude, and a circuit breaker using the magnetic trip unit.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect, this utility model provides a magnetic trip device, including an armature, a bracket, a magnetic yoke, and a return spring. The armature is provided with a triggering part, a hinge part, and a attracting part from top to bottom. The hinge part is hinged to the bracket. The magnetic yoke is fixed on the bracket. The attracting part is opposite to the magnetic yoke. The return spring is connected between the armature and the bracket. An adjusting screw is mounted on the bracket. The adjusting screw is used to adjust the swing amplitude of the armature. Under normal conditions, the adjusting screw abuts against the armature under the elastic force of the return spring.

[0008] In some embodiments, the upper end of the bracket is provided with an upwardly protruding mounting portion, and the adjusting screw is screwed onto the mounting portion.

[0009] In some embodiments, the armature has a protrusion facing the mounting portion, and the protrusion has a through hole.

[0010] In some embodiments, the hinge portion is provided with two spaced and opposite connecting pieces, the connecting pieces extending toward the bracket, and the bracket is provided with two corresponding connecting arms. The connecting pieces and connecting arms are provided with pin holes at corresponding positions, and the two connecting arms and the two connecting pieces are hinged to each other by cylindrical pins.

[0011] In some embodiments, the armature has an upwardly extending extension arm, and the trigger portion is located at the upper end of the extension arm; the adjusting screw is positioned opposite to the extension arm.

[0012] In some embodiments, the extension arm is provided with a first hanging plate, the bracket is provided with a second hanging plate, and the return spring is a tension spring with its two ends hooked onto the first hanging plate and the second hanging plate, respectively; the first hanging plate is provided with at least two hooking positions for the tension spring to connect.

[0013] In some embodiments, the end of the adjusting screw away from the armature is provided with an adjusting groove.

[0014] Secondly, this utility model also provides a circuit breaker, which includes the magnetic trip unit described above.

[0015] The positive effects of this utility model are as follows: The structure of this utility model is reasonably designed. By turning the adjusting screw to change its position, the swing amplitude of the armature can be adjusted (that is, the air gap between the armature and the magnetic yoke can be adjusted). This allows for precise control of the triggering conditions of the trip unit. When a short circuit occurs in the circuit, the adjustable armature ensures that the trip unit can quickly and accurately cut off the current, thus achieving the purpose of protection. Moreover, since the swing amplitude of the armature is adjustable, the magnetic trip unit has better versatility and can better adapt to the diverse needs of different specifications of circuit breakers. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art are briefly introduced below. Similar elements or parts in the drawings are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0017] Figure 1 This is a first-view perspective three-dimensional schematic diagram of the magnetic trip device in this utility model;

[0018] Figure 2 This is a second-view perspective three-dimensional schematic diagram of the magnetic trip device in this utility model;

[0019] Figure 3This is an exploded three-dimensional schematic diagram of the magnetic trip device in this utility model.

[0020] The reference numerals in the figure are as follows: 1-armature; 11-trigger part; 12-hinge part; 121-connecting piece; 13-attracting part; 14-protrusion part; 15-extension arm; 151-hanging plate one; 152-hanging plate two; 153-hanging position; 2-bracket; 21-mounting part; 22-connecting arm; 3-magnetic yoke; 4-adjusting screw. Detailed Implementation

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0022] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0023] Firstly, the magnetic trip unit of this utility model embodiment, such as Figure 1-3 As shown, it includes an armature 1, a bracket 2, a magnetic yoke 3, and a return spring (not shown in the figure). The armature 1 has a trigger part 11, a hinge part 12, and a pull part 13 from top to bottom. The hinge part 12 is hinged to the bracket 2, allowing the armature 1 to swing around the hinge point. The magnetic yoke 3 is fixed on the bracket 2, and the pull part 13 is opposite to the magnetic yoke 3. The return spring is connected between the armature 1 and the bracket 2. The bracket 2 is equipped with an adjusting screw 4, which is used to adjust the swing amplitude of the armature 1. Under normal conditions, the adjusting screw 4 abuts against the armature 1 under the elastic force of the return spring. When the circuit is overloaded or short-circuited, the magnetic yoke 3 generates an electromagnetic force, attracting the pull part 13 of the armature 1. The armature 1 swings around the hinge point, driving the trigger part 11 to take off. During this process, the return spring stores energy. After the fault is cleared, the electromagnetic force disappears, and the return spring pulls the armature 1 back to its initial position. The armature 1 then abuts against the adjusting screw 4 again, completing the reset. In this embodiment, the position of the adjusting screw 4 is changed by turning it, thereby adjusting the swing amplitude of the armature 1 (that is, adjusting the air gap between the armature and the yoke), so as to precisely control the triggering condition of the trip unit. When a short circuit occurs in the circuit, the adjustable armature 1 ensures that the trip unit can quickly and accurately cut off the current, thus achieving the purpose of protection. Moreover, since the swing amplitude of the armature 1 is adjustable, the magnetic trip unit has better versatility and can better adapt to the diverse needs of different specifications of circuit breakers.

[0024] To better accommodate the installation of the adjusting screw 4, an upwardly protruding mounting part 21 is provided at the upper end of the bracket 2. The adjusting screw 4 is screwed onto the mounting part 21, and the mounting part 21 provides a clear installation position for the adjusting screw 4.

[0025] In some embodiments, the armature 1 is provided with a protrusion 14 facing the mounting portion 21, and the protrusion 14 is provided with a through hole. In one usage scenario, when the adjusting screw 4 is removed or adjusted to a position where it will not contact the armature 1, the protrusion 14 can abut against the mounting portion 21, thereby limiting the swing amplitude of the armature 1 and ensuring that the armature 1 always swings within a safe range. The design of the protrusion 14 can provide a more reliable and stable operating guarantee for the trip unit. In addition, in another usage scenario, the through hole can provide a hook point for the installation of the hanging spring, which can be used to connect the magnetically adjustable structure configured in the circuit breaker.

[0026] In some embodiments, the hinge portion 12 is provided with two spaced and opposite connecting pieces 121, which extend toward the bracket 2. The bracket 2 is provided with two corresponding connecting arms 22. The connecting pieces 121 and the connecting arms 22 are provided with pin holes at corresponding positions. The two connecting arms 22 and the two connecting pieces 121 are hinged to each other by cylindrical pins. This assembly method makes the armature 1 installation form a symmetrical force structure, effectively dispersing the stress during the swing process and ensuring the stability and flexibility of the armature 1 installation.

[0027] In some embodiments, the armature 1 has an upwardly extending extension arm 15, and the trigger part 11 is disposed at the upper end of the extension arm 15; the adjusting screw 4 is positioned opposite to the extension arm 15, that is, when the armature 1 is in the initial position, the adjusting screw 4 abuts against the extension arm 15, thereby stopping and limiting the armature 1.

[0028] In some embodiments, the extension arm 15 is provided with a first hanging plate 151, the bracket 2 is provided with a second hanging plate 152, and the return spring is a tension spring, with its two ends hooked onto the first hanging plate 151 and the second hanging plate 152 respectively. This connection method is simple and reliable, and the return spring is easy to install and remove. The first hanging plate 151 is provided with at least two hooking positions 153, which can be hooked onto the tension spring. The multiple hooking positions 153 on the first hanging plate 151 allow users to select different hooking positions as needed, thereby adjusting the initial tension of the return spring. The hooking positions 153 can be provided as hanging holes or hanging grooves.

[0029] In some embodiments, the end of the adjusting screw 4 furthest from the armature 1 is provided with an adjusting groove. This groove allows the user to easily rotate the adjusting screw 4 using a tool such as a screwdriver, thereby achieving precise adjustment of the armature 1's position. This design simplifies the operation process and improves adjustment efficiency. For example, the adjusting groove can be a slotted groove or a Phillips head groove.

[0030] Secondly, this utility model embodiment also provides a circuit breaker, which includes the magnetic trip unit in the above embodiment. When the magnetic trip unit trips, it actuates the traction rod through the trigger part 11, thereby causing the circuit breaker to trip. This circuit breaker has all the advantages of the magnetic trip unit, which will not be elaborated in this embodiment.

[0031] For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of this invention still fall within the scope of protection of this invention.

Claims

1. A magnetic trip device, comprising an armature (1), a bracket (2), a magnetic yoke (3), and a return spring, wherein the armature (1) is provided with a triggering part (11), a hinge part (12), and a attracting part (13) from top to bottom, the hinge part (12) is hinged to the bracket (2), the magnetic yoke (3) is fixed on the bracket (2), the attracting part (13) is opposite to the magnetic yoke (3), and the return spring is connected between the armature (1) and the bracket (2); characterized in that: The bracket (2) is equipped with an adjusting screw (4), which is used to adjust the swing amplitude of the armature (1). Under normal conditions, the adjusting screw (4) abuts against the armature (1) under the elastic force of the return spring.

2. The magnetic trip unit according to claim 1, characterized in that: The bracket (2) has an upwardly protruding mounting part (21) at its upper end, and the adjusting screw (4) is screwed onto the mounting part (21).

3. The magnetic trip unit according to claim 2, characterized in that: The armature (1) is provided with a protrusion (14) facing the mounting part (21), and the protrusion (14) is provided with a through hole.

4. The magnetic trip unit according to claim 1, characterized in that: The hinge part (12) is provided with two spaced and opposite connecting pieces (121). The connecting pieces (121) extend toward the bracket (2). The bracket (2) is provided with two corresponding connecting arms (22). The connecting pieces (121) and the connecting arms (22) are provided with pin holes at corresponding positions. The two connecting arms (22) and the two connecting pieces (121) are hinged to each other by cylindrical pins.

5. The magnetic trip unit according to claim 1, characterized in that: The armature (1) has an upwardly extending arm (15), and the trigger part (11) is located at the upper end of the extension arm (15); the adjusting screw (4) is positioned opposite to the extension arm (15).

6. The magnetic trip unit according to claim 5, characterized in that: The extension arm (15) is provided with a first hanging plate (151), the bracket (2) is provided with a second hanging plate (152), the reset spring is a tension spring, and its two ends are hooked on the first hanging plate (151) and the second hanging plate (152) respectively; the first hanging plate (151) is provided with at least two hooking positions (153) for the tension spring to connect.

7. The magnetic trip unit according to claim 1, characterized in that: The adjusting screw (4) has an adjusting groove at the end away from the armature (1).

8. A circuit breaker, characterized in that: The circuit breaker includes the magnetic trip unit as described in any one of claims 1 to 7.

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