An electromagnetic tripping mechanism and a circuit breaker having the same

Abstract

The present invention relates to the field of low-voltage electrical equipment technology, and specifically to an electromagnetic tripping mechanism and a circuit breaker having the same, comprising: an armature, a conductive member and a yoke arranged in sequence along a vertical direction, the yoke being provided with at least one second attraction surface bent toward a first attraction surface of the conductive member, the conductive member being arranged between the main body of the yoke and the second attraction surface; an elastic reset member, arranged between a housing and the armature, the elastic reset member storing energy when current flows through the conductive member, and releasing energy after the current disappears to exert a force on the armature to return to an initial position. The present invention provides an electromagnetic tripping mechanism and a circuit breaker having the same, which can quickly attract the armature and trip the product even when the current is small.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances, and in particular to an electromagnetic tripping mechanism and a circuit breaker having the same. Background Art

[0002] A low voltage circuit breaker is a switch that can not only connect and disconnect normal load current and overload current, but also connect and disconnect short circuit current. In addition to controlling the circuit, the low voltage circuit breaker also has certain protection functions, such as overload, short circuit, undervoltage and leakage protection.

[0003] A protective mechanism, namely an electromagnetic tripping mechanism, is usually provided in the circuit breaker. When the current passing through the circuit breaker increases to a certain value, the electromagnetic tripping mechanism causes the circuit breaker to trip quickly, thereby protecting the circuit breaker. For example, Chinese patent document CN207458872U discloses an electromagnetic tripping mechanism and a circuit breaker, in which a positioning shaft passes through an elastic reset member and an armature, and is arranged above a magnetic yoke, so that when a sufficiently large current passes through, a sufficient magnetic field is generated, so that the armature moves toward the magnetic yoke, and the switch is quickly disconnected, thereby cutting off the circuit. However, this electromagnetic tripping mechanism can only be disconnected when the current passing through is large enough. When the current passing through is small, the switch cannot be quickly disconnected, which may cause load or other hazards to other electrical equipment. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the switch cannot be quickly disconnected when the current passing through is small, thereby providing an electromagnetic tripping mechanism and a circuit breaker having the same which can quickly attract the armature and trip the product when the current passing through is small.

[0005] In order to solve the above technical problems, the present invention provides an electromagnetic tripping mechanism, comprising:

[0006] An armature, a conductive member and a yoke are arranged in sequence along a vertical direction, the yoke is provided with at least one second attraction surface bent toward the first attraction surface of the conductive member, and the conductive member is arranged between the main body of the yoke and the second attraction surface;

[0007] The elastic return member is arranged between the housing and the armature. When current flows through the conductive member, the elastic return member stores energy, and releases energy after the current disappears to exert a force on the armature to return to its initial position.

[0008] Furthermore, there are two second attraction surfaces, which are alternately arranged at predetermined intervals on opposite sides of the main body of the yoke along the extension direction of the conductive member.

[0009] Furthermore, the second suction surface is arranged substantially parallel to the main body.

[0010] Furthermore, it also includes an arc-shaped transition portion arranged between the main body and the second suction surface.

[0011] Furthermore, the yoke also includes a support portion which is perpendicular to the main body portion and extends in a direction away from the armature, and an end portion of the conductive member is placed on the support portion.

[0012] Furthermore, the armature includes a main body portion, a connecting portion provided at one end of the main body portion and used for mounting the elastic reset member, and a bending portion provided at the other end of the main body portion.

[0013] Furthermore, a plurality of through holes are formed on the main body.

[0014] Furthermore, the bending portion is roughly Z-shaped and has an arc that matches the mechanism to be engaged.

[0015] The present invention also provides a circuit breaker, comprising the electromagnetic tripping mechanism.

[0016] Furthermore, a limiting member is provided on the housing to limit the armature from continuing to rotate after returning to the initial position.

[0017] The technical solution of the present invention has the following advantages:

[0018] 1. The electromagnetic tripping mechanism provided by the present invention comprises: an armature, a conductive member and a yoke arranged in sequence along the vertical direction, the yoke is provided with at least one second attraction surface bent toward the first attraction surface of the conductive member, the conductive member is arranged between the main body of the yoke and the second attraction surface; an elastic reset member is arranged between the shell and the armature, the elastic reset member stores energy when current flows through the conductive member, and releases energy after the current disappears to exert a force on the armature to return to the initial position. Compared with the prior art, the present invention adds a second attraction surface. When the current is too small, due to the setting of the second attraction surface, the strength of the magnetic field is enhanced, so that the conductive member and the yoke can quickly attract the armature, thereby achieving rapid tripping, ensuring the breaking capacity of the circuit breaker, and also ensuring the stability of the transient characteristics during the production process.

[0019] 2. In the electromagnetic tripping mechanism provided by the present invention, there are two second suction surfaces, which are staggered at predetermined intervals on opposite sides of the main body of the yoke along the extension direction of the conductive member. The main body is the middle part of the yoke, and a certain gap is left between the two second suction surfaces to prevent the magnetic field from being saturated, which is not conducive to adjusting current multiples of different specifications.

[0020] 3. The electromagnetic tripping mechanism provided by the present invention further comprises an arc-shaped transition portion arranged between the main body and the second suction surface. The arc-shaped transition portion mainly plays the role of connecting the main body and the second suction surface.

[0021] 4. In the electromagnetic tripping mechanism provided by the present invention, the supporting part mainly plays the role of supporting the conductive member to prevent the conductive member from being deformed when subjected to force, and also plays the role of gathering the magnetic field force.

[0022] 5. The electromagnetic tripping mechanism provided by the present invention has a plurality of through holes formed on the main body. The through holes can reduce the weight of the main body and make the armature's attraction surface more concentrated when the yoke attracts the armature, making it easier for the armature to overcome the reaction force of the elastic reset member, thereby increasing the tripping speed of the armature. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a circuit breaker provided by the present invention;

[0025] Figure 2 A schematic diagram of the structure of the electromagnetic tripping mechanism provided by the present invention;

[0026] Figure 3 for Figure 2 Schematic diagram of the structure of the middle magnetic yoke;

[0027] Figure 4 for Figure 2 Schematic diagram of the structure of the middle armature;

[0028] Description of reference numerals:

[0029] 1-magnetic yoke; 2-second suction surface; 3-main body; 4-arc transition part; 5-support part; 6-armature; 7-main body; 8-connecting part; 9-bending part; 10-through hole; 11-elastic reset member; 12-conductive member; 121-first suction surface; 13-limiting member; 14-housing; 15-fixed shaft; 16-fixed block; DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] like Figure 1-4 As shown, an electromagnetic tripping mechanism provided by an embodiment of the present invention comprises: an armature 6, a conductive member 12 and a yoke 1 arranged in sequence along a vertical direction, the yoke 1 being provided with at least one second attraction surface 2 bent toward a first attraction surface 121 of the conductive member 12, the conductive member 12 being arranged between a main body 3 of the yoke 1 and the second attraction surface 2; an elastic reset member 11, arranged between a shell 14 and the armature 6, the elastic reset member 11 storing energy when current flows through the conductive member 12, and releasing energy after the current disappears to apply a force on the armature 6 to return to an initial position.

[0033] The first attraction surface 121 is the middle part of the conductive part 12, which fits with the bottom surface of the yoke 1. The armature 6 is arranged above the conductive part 12 and the yoke 1, and a predetermined gap is left between the conductive part 12 and the yoke 1. A fixing block 16 is arranged on the shell 14, and a groove is opened on the fixing block 16, which plays a role in fixing the elastic return member 11. One end of the elastic return member 11 is stuck in the groove, and the other end contacts with the bottom surface of the armature 6. The elastic return member 11 and the armature 6 are penetrated together by the fixed shaft 15, so that the armature 6 can rotate around the fixed shaft 15.

[0034] When the line is short-circuited, current will flow through the conductive member 12 and the yoke 1, and electromagnetic induction will occur, thereby generating a magnetic field of a certain intensity. The larger the current, the stronger the magnetic field. When a sufficiently large current is generated, the armature 6 will be attracted by the magnetic field and move in the direction of attraction with the yoke 1. In this process, the armature 6 gradually overcomes the elastic force of the elastic reset member 11 and stores energy, thereby causing the electromagnetic tripping mechanism in the circuit breaker to trip, thereby playing an instantaneous protective role. After the electromagnetic tripping mechanism is tripped, the force is transmitted to the locking position of the circuit breaker, causing it to be quickly unlocked, and finally cutting off the circuit, thereby protecting the line in time. After the circuit breaker is disconnected, the current on the conductive member 12 and the yoke 1 disappears, and the magnetic field disappears accordingly. The armature 6 returns to its initial position under the elastic force of the elastic reset member 11.

[0035] The second attraction surface 2 is integrally formed on the yoke 1 and arranged above the conductive member 12. The second attraction surface 2 is added. When the current is too small, the second attraction surface 2 is arranged to enhance the strength of the magnetic field, so that the conductive member 12 and the yoke 1 can quickly attract the armature 6, thereby achieving rapid tripping, ensuring the breaking capacity of the circuit breaker, and also ensuring the stability of the transient characteristics during the production process. The elastic reset member 11 of this embodiment is a torsion spring.

[0036] like Figure 3 As shown, there are two second suction surfaces 2, which are staggered at predetermined intervals on opposite sides of the main body 3 of the yoke 1 along the extension direction of the conductive member 12. The extension direction of the conductive member 12 is the length direction thereof. The main body 3 is the middle part of the yoke, and a certain gap is left between the two second suction surfaces 2 to prevent the magnetic field from being saturated, which is not conducive to adjusting the current multiples of different specifications. A certain gap is left between the two second suction surfaces 2, and at the same time, the activity space of the conductive member 12 can be limited.

[0037] The second suction surface 2 is basically parallel to the main body 3. The second suction surface 2 and the main body 3 are an integrally formed part. After the yoke 1 is processed, there is an angle of 30-60° between the second suction surface 2 of the yoke 1 and the main body 3. The range of the angle is to allow the conductive part 12 to enter. When installing the conductive part 12 on the yoke 1, first fit the conductive part 12 on the main body 3 of the yoke 1, and then apply a bending force toward the conductive part 12 to the second suction surface 2. After the installation of the yoke 1 and the conductive part 12 is completed, the second suction surface 2 and the main body 3 are in a basically parallel state. If the conductive part 12 is to be removed or replaced, a force away from the main body 3 is applied to the second suction surface 2 to complete the removal or replacement of the conductive part 12.

[0038] It also includes an arc-shaped transition portion 4 arranged between the main body 3 and the second suction surface 2. The arc-shaped transition portion 4 mainly serves to connect the main body 3 and the second suction surface 2. Side walls are provided on both sides of the extension direction of the yoke main body 3, and the side walls have a certain inclination angle with the main body 3, which reduces the distance of the suction armature 6 and improves the suction force, while also limiting the activity space of the conductive member 12.

[0039] The yoke 1 further includes a support portion 5 which is perpendicular to the main body portion 3 and extends in a direction away from the armature 6, and the end of the conductive member 12 is placed on the support portion 5. The support portion 5 mainly supports the conductive member 12 to prevent the conductive member 12 from deforming when subjected to force, and also plays a role in gathering the magnetic field force.

[0040] The armature 6 includes a main body 7 and a connecting portion 8 provided at one end of the main body 7 for mounting the elastic reset member 11, and a bending portion 9 provided at the other end of the main body 7. The bending portion 9 is roughly Z-shaped and has an arc that matches the mechanism to be snapped. The main body 7 is the middle part of the armature 6, the connecting portion 8 is the left end of the armature 6, the bending portion 9 is the right end of the armature 6, and the connecting portion 8 is roughly circular, allowing the fixed shaft 15 to pass through, thereby connecting with the elastic reset member 11. The bending portion 9 is roughly Z-shaped and has a certain arc, which matches the shape of the lock buckle on the circuit breaker. There is no specific restriction on the length of the armature 6, as long as the lock buckle is snapped to unlock it.

[0041] like Figure 4 As shown, a plurality of through holes 10 are formed on the main body 7. In this embodiment, the cross section of the through hole 10 is an isosceles right-angled trapezoid. The through hole 10 can reduce the weight of the armature 6, and at the same time, when the yoke 1 attracts the armature 6, the attracting surface of the armature 6 is more concentrated, so that the armature 6 can more easily overcome the reaction force of the elastic reset member 11, thereby increasing the release speed of the armature 6.

[0042] As an alternative embodiment, a plurality of second attraction surfaces 2 may also be arranged on the same side of the main body 3 of the yoke 1 along the extension direction of the conductive member 12 , as long as they can cover a portion of the first attraction surface 121 of the conductive member 12 .

[0043] As an alternative embodiment, the elastic return member 11 may also be a compression spring, a disc spring or other element with an elastic energy storage function.

[0044] like Figure 1 As shown, the present invention also provides a circuit breaker, including the electromagnetic tripping mechanism. A limiter 13 is provided on the housing 14 to limit the armature 6 from continuing to rotate after returning to the initial position. After the circuit breaker is disconnected, the current on the conductive member 12 and the yoke 1 disappears, and the magnetic field disappears accordingly. The armature 6 returns to the initial position under the elastic force of the elastic reset member 11. The function of the limiter 13 is to prevent the armature 6 from continuing to rise and infinitely recover until it hits the housing 14, which increases the suction distance for the next time the armature 6 is sucked in, that is, a larger amount of current is required to suck the armature 6 down, thereby affecting the safety of the circuit.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An electromagnetic tripping mechanism, arranged on a housing (14) of a circuit breaker, characterized in that: include: An armature (6), a conductive member (12) and a magnetic yoke (1) are arranged in sequence along a vertical direction, the magnetic yoke (1) is provided with two second attracting surfaces (2) bent toward a first attracting surface (121) of the conductive member (12), and the conductive member (12) is arranged between a main body (3) of the magnetic yoke (1) and the second attracting surfaces (2); An elastic return member (11) is disposed between the housing (14) and the armature (6), wherein the elastic return member (11) stores energy when current flows through the conductive member (12), and releases the energy after the current disappears to exert a force on the armature (6) to return to an initial position; The two second attraction surfaces (2) are staggeredly arranged at predetermined intervals on opposite sides of the main body (3) of the yoke (1) along the extension direction of the conductive member (12).

2. The electromagnetic tripping mechanism according to claim 1, characterized in that: The second suction surface (2) is arranged substantially parallel to the main body (3).

3. The electromagnetic tripping mechanism according to claim 1, characterized in that: It also includes an arc-shaped transition portion (4) arranged between the main body portion (3) and the second suction surface (2).

4. The electromagnetic tripping mechanism according to claim 1, characterized in that: The magnetic yoke (1) further comprises a support portion (5) which is perpendicular to the main body portion (3) and extends in a direction away from the armature (6), and an end portion of the conductive member (12) is mounted on the support portion (5).

5. The electromagnetic tripping mechanism according to any one of claims 1 to 4, characterized in that: The armature (6) comprises a main body (7), a connecting portion (8) arranged at one end of the main body (7) and used for mounting the elastic reset member (11), and a bending portion (9) arranged at the other end of the main body (7).

6. The electromagnetic tripping mechanism according to claim 5, characterized in that: A plurality of through holes (10) are formed on the main body (7).

7. The electromagnetic tripping mechanism according to claim 5, characterized in that: The bending portion (9) is roughly Z-shaped and has an arc that matches the mechanism to be snapped.

8. A circuit breaker, characterized in that: It comprises the electromagnetic tripping mechanism as described in any one of claims 1 to 7.

9. The circuit breaker according to claim 8, characterized in that A limiting member (13) is provided on the housing (14) for limiting the armature (6) from continuing to rotate after returning to the initial position.

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