CN212648162U

CN212648162U - Clapper type electromagnet

Info

Publication number: CN212648162U
Application number: CN202022012622.XU
Authority: CN
Inventors: 朱天胜; 陆伟文; 刘洪武
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-03-02
Anticipated expiration: 2030-09-15

Abstract

A clapper type electromagnet belongs to the technical field of low-voltage electric appliances. Including armature, yoke, support, conductor and reaction spring, the armature pivot is established on the support, and the yoke is fixed on the support, and reaction spring connects between armature and support, makes to be formed with the magnetic gap between armature and the yoke through the spacing of support and reaction spring's effect, and the yoke comprises a pair of curb plate that sets up face to face each other and a bottom plate that is used for connecting a pair of curb plate, characteristics: the surface of the armature facing the yoke iron is provided with an additional iron core, when current flows through the conductor, electromagnetic attraction is generated between the armature and the yoke iron, the electromagnetic attraction enables the armature to rotate to complete the stroke of the magnetic gap and then to be attracted with the pair of side plates, and at the moment, the additional iron core is positioned between the two surfaces of the pair of side plates facing each other. The advantages are that: the electromagnetic attraction moment borne by the armature under low current is obviously improved, so that the electromagnet can be ensured to be reliably attracted.

Description

Clapper type electromagnet

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to clap box-like electro-magnet.

Background

The clapper type electromagnet is widely applied to functional components for driving a tripping mechanism of an electric switch to trip in the electric switch, and comprises a rotatable armature, a fixed yoke and a good conductor for loading current, the air gap between the rotatable armature and the fixed yoke is formed into a magnetic circuit, when the current passing through the good conductor is larger than the set current, the rotatable armature is subject to electromagnetic attraction to rotate towards the fixed yoke, and particularly rotates from a first position to a second position, wherein the first position is a position where the rotatable armature is separated from the fixed yoke and a magnetic gap is formed between the rotatable armature and the fixed yoke, and the so-called second position is the position in which the rotatable armature moves in the direction of the yoke and is in engagement with the yoke i.e. in attracting contact, when the rotatable armature changes from the first position to the second position, an actuating rod on the armature pushes the tripping mechanism to trip.

The magnetic resistance of the magnetic circuit of the clapper type electromagnet is mainly concentrated at the air gap, the air gap magnetic resistance of the clapper type electromagnet in the prior art is linearly increased along with the increase of the opening angle of the rotary armature, and the electromagnetic torque is approximately inversely proportional to the square of the magnetic resistance, so that the electromagnetic torque is rapidly reduced along with the increase of the opening angle of the armature. Therefore, when the action current of the clapper type electromagnet is large, the electromagnetic torque of the armature at the first position can still meet the action requirement. However, when the value of the operating current of the clapper type electromagnet is small, the armature cannot operate due to insufficient electromagnetic torque at the first position, or the armature cannot drive the tripping mechanism of the electric switch to trip due to insufficient energy after operating.

As shown in fig. 1, a clapper type electromagnet in the prior art includes an armature 1, a yoke 2, a bracket 3, a conductor 4, and a reaction spring 5. Armature 1 is installed on support 3, and reaction spring 5 connects armature 1 and support 3, and armature 1 can rotate around rotation center O to by the spacing part spacing on support 3, constitute a magnetic gap between armature 1 and yoke 2 this moment. As can be seen from the structure of fig. 1, the armature 1 and the yoke 2 surround the conductor 4, and the air gap between the armature 1 and the yoke 3 forms a complete magnetic circuit. When current passes through the conductor 4, the armature 1 is subjected to anticlockwise moment taking the rotating center O on the bracket 3 as a fulcrum, when the moment value is larger than the counter moment provided by the counter-force spring 5, the armature 1 approaches the yoke 2 and is finally slapped with the yoke 2, at the moment, the armature 1 completes the conversion from the first position to the second position, and meanwhile, the upper end of the armature 1 drives a tripping mechanism of an electric switch to trip. At present, the clapper type electromagnet with the structure can only be used in the case that a large current passes through the conductor 4 (the current is usually more than 500A), but when the current passing through the conductor 4 is small (typically, the current value is 300A or 400A), the electromagnetic torque received by the armature 1 in the first position is not enough to overcome the counter torque of the counter spring 5, so that the armature 1 cannot trip the tripping mechanism of the electric switch.

In view of the above-mentioned prior art, there is a need for a reasonable improvement of the structure of the prior clapper type electromagnet. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

The task of the utility model is to provide a clapper formula electro-magnet, it can show the electro-magnet that improves under the undercurrent armature and receive and inhale moment to guarantee the reliable actuation of electro-magnet ability.

The utility model is a clapper type electromagnet, which comprises an armature, a yoke, a bracket, a conductor and a counter-force spring, the armature is pivoted on the bracket, the yoke iron is fixed on the bracket, the counter force spring is connected between the armature and the bracket, a magnetic gap is formed between the armature iron and the yoke iron through the limit of the bracket and the action of the counterforce spring, the yoke is composed of a pair of side plates which are arranged oppositely and a bottom plate which is used for connecting the pair of side plates, the cross section of the yoke iron is in a shape of' and surrounds the conductor, an additional iron core is arranged on the surface of the armature iron facing the yoke iron, when current flows through the conductor, electromagnetic attraction is generated between the armature and the yoke, the armature rotates to complete the stroke of the magnetic gap and then is attracted with the pair of side plates through the electromagnetic attraction, and at the moment, the additional iron core is positioned between two mutually facing surfaces of the pair of side plates.

In another specific embodiment of the present invention, a distance D2 between two faces of the pair of side plates facing each other is greater than a width D1 of the additional core.

In a further embodiment of the invention, the distance D3 between the two mutually facing sides of the pair of side plates is smaller than the width D4 of the armature.

In another specific embodiment of the present invention, the bracket includes a bracket bottom plate, and the two sides of the bracket bottom plate are bent to form a bracket side plate I and a bracket side plate II, so that the cross section of the bracket is in the shape of "]" and is wrapped outside the yoke.

In yet another embodiment of the present invention, the bottom plate of the yoke is fixed to the bracket bottom plate of the bracket.

In yet another specific embodiment of the present invention, the first bracket side plate and the second bracket side plate are correspondingly provided with a first pivot hole and a second pivot hole, and the two sides of the armature are correspondingly extended with a first pivot axis pivoted in the first pivot hole and a second pivot axis pivoted in the second pivot hole.

In a more specific embodiment of the present invention, a limiting shaft extends from a side portion of the armature corresponding to the first pivot axis, and the limiting shaft is used for radial limiting during the rotation of the armature; and a limiting boss is arranged on the pivoting shaft head II in an extending direction perpendicular to the pivoting shaft head II in an extending manner and is used for axial limiting in the armature rotating process.

In yet another specific embodiment of the present invention, the armature is further extended with an actuating rod, the actuating rod is provided with a spring hanging groove, the bracket bottom plate is provided with a spring hanging groove, and both ends of the reaction spring are respectively hung on the spring hanging groove and the spring hanging groove.

In a still more specific embodiment of the present invention, the limit of the bracket is a limit part provided on the bracket side plate one and/or the bracket side plate two for matching with the side end part of the armature.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: compared with the prior art, when the initial position of the armature, namely the armature is separated from the yoke, the magnetic gap between the armature and the yoke is reduced, and meanwhile, the effective magnetic pole surface is increased; secondly, the stroke of the armature is unchanged, so that the reliability of the tripping action of the tripping mechanism of the electric switch is ensured; thirdly, the parts such as the original armature iron, the yoke iron and the like are not required to be changed, and the parts are ensured to be generalized.

Drawings

Fig. 1 is a schematic structural diagram of a clapper type electromagnet in the prior art.

Fig. 2 is a perspective view of the clapper type electromagnet of the present invention.

Fig. 3a is a side view of the armature and yoke assembly after the bracket is removed.

Fig. 3b is a cross-sectional view a-a of fig. 3 a.

Fig. 4 is a side view of the armature in a first, disengaged position according to the present invention.

Fig. 5 is a side view of the armature in a second, engaged position according to the present invention.

Fig. 6a is a schematic structural diagram of an embodiment of the armature according to the present invention.

Fig. 6b is a schematic structural view of another embodiment of the armature of the present invention.

Fig. 7 is a diagram showing the relationship between the distance between the armature and the yoke and the electromagnetic torque applied to the armature in the prior art and the present invention.

In the figure: 1. the armature comprises an armature, 11, an armature pull-in surface, 12, an additional iron core, 13, a first pivoting shaft head, 14, a second pivoting shaft head, 141, a limit boss, 15, an actuating rod, 151, a spring hanging groove and 16, a limit shaft;

2. yoke iron, 21 lateral plates, 22 bottom plates, 211 yoke iron suction surfaces;

3. the support comprises a support, 31, a support bottom plate, 311, a spring hanging groove, 32, a support side plate I, 321, a pivot hole I, 33, a support side plate II, 331, a pivot hole II, 332 and a limiting protrusion;

4. a conductor; 5. a reaction spring.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept relating to the directions or orientations of up, down, left, right, front, and rear is based on the position shown in the corresponding drawings, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 2, the present invention relates to a clapper type electromagnet, which includes an armature 1, a yoke 2, a bracket 3, a conductor 4 and a reaction spring 5, wherein the armature 1 is pivoted on the bracket 3, the yoke 2 is fixed on the bracket 3, the reaction spring 5 is connected between the armature 1 and the bracket 3, and a magnetic gap is formed between the armature 1 and the yoke 2 by the limit of the bracket 3 and the action of the reaction spring 5. The yoke 2 is composed of a pair of side plates 21 disposed to face each other and a bottom plate 22 for connecting the pair of side plates 21. The bottom plate 22 is connected to the same end portion of the pair of side plates 21 so that the yoke 2 has a cross-section in the shape of "]" and surrounds the conductor 4, and the armature 1 is disposed at an open end of the "]" shaped yoke 2 so that the conductor 4 passes through a space surrounded by the armature 1 and the yoke 2.

As shown in fig. 2 to 6a, a surface of the armature 1 facing the yoke 2 is an armature attracting surface 11, an additional iron core 12 is disposed on the armature attracting surface 11, and the additional iron core 12 has a certain height H, a certain width D1, and a certain thickness. The distance D2 between the two faces of the pair of side plates 21 facing each other is greater than the width D1 of the additional core 12. When the current flows through the conductor 4, an electromagnetic attraction force is generated between the armature 1 and the yoke 2, the electromagnetic attraction force enables the armature 1 to rotate to complete the attraction with the pair of side plates 21 after the magnetic gap stroke is completed, the additional iron core 12 is not interfered with the yoke 2 in the attraction process, the armature attraction surface 11, facing the yoke 2, of the armature 1 is matched with the yoke attraction surface 211, facing the armature 1, of the side plate 21 of the yoke 2 in the attraction position, and at the moment, the additional iron core 12 is located between two mutually facing surfaces of the pair of side plates 21.

As shown in fig. 3b, the distance D3 between the two surfaces of the pair of side plates 21 facing away from each other is smaller than the width D4 of the armature 1. Thus, the yoke engaging surface 211 of the side plate 21 of the yoke 2 facing the armature 1 is completely in contact with the armature engaging surface 11 of the armature 1.

As shown in fig. 6a, the additional core 12 may be a separate part fixed to the armature 1. The additional iron core 12 may also be integrally formed with the armature 1, and specifically, the additional iron core 12 is formed by extending and bending the bottom of the armature 1, as shown in fig. 6 b.

As shown in fig. 2, the bracket 3 includes a bracket bottom plate 31, and two sides of the bracket bottom plate 31 are bent to form a bracket side plate first 32 and a bracket side plate second 33, so that the cross section of the bracket 3 is in a "]" shape and covers the outside of the yoke 2. The bottom plate 22 of the yoke 2 is fixed to the bracket bottom plate 31 of the bracket 3. The first bracket side plate 32 and the second bracket side plate 33 are correspondingly provided with a first pivot hole 321 and a second pivot hole 331, a first pivot shaft head 13 and a second pivot shaft head 14 are correspondingly arranged on two sides of the armature 1, and the first pivot shaft head 13 and the second pivot shaft head 14 are correspondingly arranged in the first pivot hole 321 and the second pivot hole 331 respectively. A limiting shaft 16 is arranged on the side of the armature 1 at a position corresponding to the first pivot shaft 13 in an extending manner, specifically, the limiting shaft 16 is parallel to the first pivot shaft 13 and is positioned above or below the first pivot shaft 13, and the limiting shaft 16 is used for radial limiting in the rotation process of the armature 1; a limit boss 141 is arranged on the pivoting shaft head II 14 in an extending direction perpendicular to the pivoting shaft head II 14 in an extending manner, and the limit boss 141 is used for axial limit in the rotating process of the armature 1. An actuating rod 15 is further arranged on the armature 1 in an extending mode, a spring hanging groove 151 is formed in the actuating rod 15, a spring hanging groove 311 is formed in the support bottom plate 31, and two ends of the counter force spring 5 are respectively hung on the spring hanging groove 151 and the spring hanging groove 311.

Referring to fig. 2, the limiting device provided on the bracket 3 is a limiting part provided on the bracket side plate one 32 or the bracket side plate two 33, or both the bracket side plate one 32 and the bracket side plate two 33 are provided with a limiting part. The armature 1 is arranged between the limiting part of the bracket 3 and the yoke 2, when the electromagnet is not electrified or the electromagnetic suction torque borne by the armature 1 is smaller than the counter torque of the counter spring 5, the armature 1 abuts against the limiting part, and when the electromagnetic suction torque borne by the armature 1 is larger than the counter torque of the counter spring 5, the armature 1 and the yoke 2 are attracted. In this embodiment, the limiting component is a limiting protrusion 332 convexly disposed on the second bracket side plate 33, and the limiting protrusion 332 is matched with the side end of the armature 1, specifically, a surface of the side end facing away from the yoke 2. The limiting protrusion 332 can also be arranged on the first bracket side plate 32, or the first bracket side plate 32 and the second bracket side plate 33 are both provided with the limiting protrusion 332.

With continuing reference to fig. 4 and 5, the working principle of the clapper type electromagnet of the present invention is:

fig. 4 shows the first position of the armature 1, i.e. the position where the armature 1 is separated from the yoke 2 and there is a magnetic gap therebetween, and at this time, the armature 1 is subjected to the reaction force of the reaction spring 5 and tends to rotate clockwise around the fulcrum O, but because of the limit boss 332 on the bracket 3, the armature 1 is kept at the first position and there is a magnetic gap between the armature 1 and the yoke 2. When a certain current flows through the conductor 4, the electromagnetic attraction moment borne by the armature 1 is larger than the counter moment provided by the counter force spring 5, the armature 1 rotates anticlockwise around the fulcrum O until reaching the second position, namely the position when the armature 1 and the yoke 2 are in attraction contact, as shown in fig. 5, at this time, the additional iron core 12 is positioned between the pair of side plates 21, namely the additional iron core 12 is completely surrounded by the yoke.

Compared with the prior art, the armature 1 is provided with the additional iron core 12 facing the yoke 2, so that the electromagnetic attraction moment borne by the armature 1 can be effectively improved under the condition that a certain current flows through the conductor 4, and the reliable attraction of the armature 1 is ensured under the low current. Fig. 7 shows a comparison of the torque experienced by the armature 1 in this patent solution versus the prior art solution. It can be seen from the figure that when the magnetic spacing of armature 1 is the same with yoke 2, the electromagnetic attraction torque that armature received among this patent technical scheme is greater than the electromagnetic attraction torque that armature received among the prior art scheme, and especially the magnetic spacing is big more, and the range that the electromagnetic attraction torque that armature received among this patent technical scheme is big more than the electromagnetic attraction torque that armature received among the prior art scheme.

In the technical solution of the present invention, the armature 1 and the yoke 2 are made of ferromagnetic material, such as: low carbon steel or electrical pure iron; the bracket 3 is made of non-magnetic-conductive materials, such as stainless steel; the conductor 4 is a copper conductor, but may also be a bimetallic strip, an aluminum conductor, a copper-clad aluminum conductor, or the like.

Claims

1. The clapper type electromagnet comprises an armature (1), a yoke (2), a support (3), a conductor (4) and a reaction spring (5), wherein the armature (1) is pivoted on the support (3), the yoke (2) is fixed on the support (3), the reaction spring (5) is connected between the armature (1) and the support (3), a magnetic gap is formed between the armature (1) and the yoke (2) through the limiting of the support (3) and the action of the reaction spring (5), the yoke (2) is composed of a pair of side plates (21) which are arranged face to face and a bottom plate (22) which is used for connecting the pair of side plates (21), so that the cross section of the yoke (2) is in a shape of' and surrounds the conductor (4), and the clapper type electromagnet is characterized in that: an additional iron core (12) is arranged on the surface of the armature (1) facing the yoke (2), when current flows through the conductor (4), electromagnetic attraction is generated between the armature (1) and the yoke (2), the armature (1) is attracted with the pair of side plates (21) after rotating to complete the magnetic gap stroke through the electromagnetic attraction, and at the moment, the additional iron core (12) is positioned between two surfaces of the pair of side plates (21) facing each other.

2. Clapper electromagnet according to claim 1, characterised in that the distance D2 between the two facing surfaces of the pair of side plates (21) is greater than the width D1 of the additional core (12).

3. Clapper electromagnet according to claim 2, characterised in that the distance D3 between the two faces of the pair of side plates (21) facing away from each other is smaller than the width D4 of the armature (1).

4. The clapping type electromagnet according to claim 1, wherein the bracket (3) comprises a bracket bottom plate (31), and two sides of the bracket bottom plate (31) are bent to form a bracket side plate I (32) and a bracket side plate II (33), so that the cross section of the bracket (3) is in a shape of a cross section and covers the outer side of the yoke (2).

5. Clapper electromagnet according to claim 4, characterised in that the base plate (22) of the yoke (2) is fixed to the support base plate (31) of the support (3).

6. The clapper type electromagnet according to claim 4, wherein the first bracket side plate (32) and the second bracket side plate (33) are correspondingly provided with a first pivot hole (321) and a second pivot hole (331), and the two sides of the armature (1) are correspondingly provided with a first pivot shaft head (13) pivoted in the first pivot hole (321) and a second pivot shaft head (14) pivoted in the second pivot hole (331) in an extending manner.

7. Clapper electromagnet according to claim 6, characterised in that the lateral part of the armature (1) in correspondence of the first pivot axis (13) is extended by a limit shaft (16), the limit shaft (16) being used for radial limit during the rotation of the armature (1); and a limit boss (141) is arranged on the pivoting shaft head II (14) in an extending direction perpendicular to the pivoting shaft head II (14), and the limit boss (141) is used for axial limit in the rotating process of the armature (1).

8. A clapper type electromagnet according to claim 4, wherein the armature (1) is further provided with an actuating rod (15) in an extending manner, the actuating rod (15) is provided with a spring hanging groove (151), the bracket bottom plate (31) is provided with a spring hanging groove (311), and two ends of the reaction spring (5) are respectively hung on the spring hanging groove (151) and the spring hanging groove (311).

9. Clapper electromagnet according to claim 4, characterised in that the limit of the bracket (3) is a limit part arranged on the first bracket side plate (32) and/or the second bracket side plate (33) for cooperating with the side end of the armature (1).