Electromagnet for switch

Abstract

An electromagnet for a switch belongs to the technical field of low-voltage apparatuses. Comprising a magnet yoke, a static iron core, a movable iron core and a coil, the static iron core is fixed on the magnet yoke, the movable iron core and the static iron core are oppositely arranged and can move up and down, the coil is sleeved on the movable iron core and the static iron core, and a mute pad is additionally arranged between the upper end face and / or the lower end face of the coil and the magnet yoke. The electromagnet has the advantages that the gap is filled by the additionally arranged mute pad, so that noise caused by vibration in the electromagnet is eliminated.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to an electromagnet for switching. Background Technology

[0002] Switches are widely used in low-voltage power distribution systems. They are devices that can close, carry, and interrupt current under normal circuit conditions, providing safety assurance for the circuit.

[0003] Currently, the electromagnetic operating components used in switches, such as shunt trip units, closing electromagnets, and undervoltage trip units, are generally non-enclosed electromagnets. When a 50Hz alternating current is applied to the electromagnet, a Lorentz force varying at 100Hz is generated between the windings on the coil. Under the 100Hz changing magnetic field, the electromagnet housing vibrates, and these vibrations will cause abnormal noises from the electromagnet.

[0004] In view of the aforementioned existing technology, it is necessary to make reasonable improvements to the existing electromagnet structure for switching. To this end, the applicant has made beneficial designs, and the technical solution described below arises from this background. Utility Model Content

[0005] The purpose of this utility model is to provide a switch electromagnet that eliminates noise caused by internal vibration of the electromagnet by filling the gap between the upper and / or lower end face of the electromagnet coil and the magnetic yoke.

[0006] The purpose of this utility model is achieved as follows: an electromagnet for switching includes a magnetic yoke, a stationary iron core, a moving iron core, and a coil. The stationary iron core is fixed on the magnetic yoke. The moving iron core is arranged opposite to the stationary iron core and can move up and down. The coil is sleeved on the moving iron core and the stationary iron core. A sound-dampening pad is added between the upper end face and / or the lower end face of the coil and the magnetic yoke.

[0007] In one specific embodiment of this utility model, an actuating rod is also included, which moves synchronously with the moving iron core.

[0008] In another specific embodiment of this utility model, the coil includes a winding and a support, the winding is wound on the support, and the sound-silencing pad is located between the end face of the support and the magnetic yoke.

[0009] In another specific embodiment of this utility model, the magnetic yoke includes a cover plate, an outer wall portion, and an embedded portion. The cover plate covers the end of the outer wall portion, one end of the embedded portion is connected to the outer wall portion and extends into the electromagnet, and the embedded portion is sleeved and fitted with the moving iron core.

[0010] In another specific embodiment of this utility model, the sound-absorbing pad is made of sound-absorbing cotton or a rubber pad.

[0011] In another specific embodiment of this utility model, the thickness of the silencing pad is 0.9 to 1.1 mm in its natural state, and is compressed to 0.15 to 0.35 mm after being installed inside the electromagnet.

[0012] In a further specific embodiment of this utility model, a baffle is also included. The baffle passes through the actuating rod and cooperates with the spring. The end of the spring that cooperates with the moving iron core abuts against the baffle, and the baffle abuts against the actuating rod.

[0013] In a further specific embodiment of this utility model, the sound-silencing pad is annular and has a positioning hole, which is used to cooperate with the support of the coil for positioning.

[0014] In yet another specific embodiment of this utility model, the positioning hole is a half-hole.

[0015] In yet another specific embodiment of this utility model, a positioning boss is provided at the end face of the bracket. At one end of the cover plate near the magnetic yoke, the positioning boss passes through the positioning hole and is embedded into the mating hole on the cover plate.

[0016] The present invention has the following advantages due to the above-mentioned structure: a sound-absorbing pad is provided between the upper end face and / or lower end face of the electromagnet coil and the magnetic yoke to fill the gap, thereby eliminating noise caused by internal vibration of the electromagnet. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the silent electromagnet described in this utility model;

[0018] Figure 2 This is a three-dimensional exploded view of the silent electromagnet portion of the present invention;

[0019] Figure 3 A schematic diagram of the structure of the sound-silencing pad described in this utility model.

[0020] In the diagram: 1. Magnetic yoke, 11. Cover plate, 111. Mating hole, 12. Outer wall, 13. Embedded part; 2. Stationary iron core; 3. Moving iron core; 4. Actuating rod; 5. Spring; 6. Coil, 61. Winding, 62. Bracket, 621. Positioning boss; 7. Baffle; 8. First dustproof component; 9. Second dustproof component, 91. Clearance hole; 100. Silent pad, 101. Positioning hole; 200. Lead wire. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0022] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0023] like Figure 1 This is a schematic diagram of an electromagnet for switching. The electromagnet includes a yoke 1, a stationary iron core 2, a moving iron core 3, an actuating rod 4, a spring 5, and a coil 6. The stationary iron core 2 is fixed to the yoke 1, and the moving iron core 3 is positioned opposite the stationary iron core 2 and can move up and down. The coil 6 is sleeved on the moving iron core 3 and the stationary iron core 2, and the yoke 1 passes around the outside of the coil 6 and connects the moving iron core 3 and the stationary iron core 2.

[0024] The actuating rod 4 moves synchronously with the moving iron core 3. One end of the spring 5 abuts against the stationary iron core 2, and the other end abuts against the actuating rod 4. The spring 5 pushes the actuating rod 4, so that the actuating rod 4 always remains relatively stationary with the moving iron core 3. The actuating rod 4 can be integrally set with the moving iron core 3; therefore, the actuating rod 4 is not essential.

[0025] When the electromagnet is energized, it is subjected to a magnetic field, causing the moving iron core 3 to move closer to the stationary iron core 2 and downwards, thus extending the actuating rod 4. When the electromagnet is de-energized, the spring 5 pushes the actuating rod 4 inwards, simultaneously causing the moving iron core 3 to return to its original position.

[0026] The magnetic yoke 1 includes a cover plate 11, an outer wall portion 12, and an insert portion 13. Preferably, the outer wall portion 12 and the cover plate 11 are located outside the electromagnet. After the electromagnet is installed internally, the cover plate 11 covers the end of the outer wall portion 12, thus fixing the cover plate 11 to the outer wall portion 12. One end of the insert portion 13 is connected to the outer wall portion 12 and extends into the electromagnet. The insert portion 13 is fitted with the moving iron core 3, and the two can move relative to each other. After installation, the stationary iron core 2, the cover plate 11, the outer wall portion 12, the insert portion 13, and the moving iron core 3 form a magnetic circuit, while an air gap is formed between the stationary iron core 2 and the moving iron core 3.

[0027] Preferably, the moving iron core 3 and the stationary iron core 2 are cylindrical. Both the moving iron core 3 and the stationary iron core 2 have circular holes that mate with the actuating rod 4. Both ends of the actuating rod 4 extend into the circular holes on the stationary iron core 2 and the moving iron core 3.

[0028] The coil 6 includes a winding 61 and a support 62, with the winding 61 wound around the support 62. The winding 61 is typically made of enameled wire.

[0029] In this embodiment, a baffle 7 is also included, which passes through the actuating rod 4 and cooperates with the spring 5. Specifically, the end of the spring 5 closest to the moving iron core 3 abuts against the baffle 7, and the baffle 7 abuts against the actuating rod 4. More specifically, the actuating rod 4 has a flange, and the baffle 7 abuts against the flange.

[0030] To achieve a dustproof effect, dustproof components are provided on both ends of the electromagnet corresponding to the extension and retraction direction of the actuating rod 4. These dustproof components include a first dustproof component 8 and a second dustproof component 9. The first dustproof component 8 and the second dustproof component 9 are respectively attached to the two ends of the electromagnet. Specifically, the first dustproof component 8 is attached to the end corresponding to the moving iron core 3, while the second dustproof component 9 is attached to the end corresponding to the stationary iron core 2.

[0031] Specifically, the second dustproof component 9 has a clearance hole 91 to allow space for the actuating rod 4. The second dustproof component 9 is disc-shaped, while the first dustproof component 8 is cap-shaped.

[0032] A sound-absorbing pad 100 is added between the upper and / or lower end face of the coil 6 and the magnetic yoke 1. The sound-absorbing pad 100 can fill the gap between the coil 6 and the magnetic yoke 1, thereby eliminating noise caused by internal vibration of the electromagnet.

[0033] Specifically, a sound-absorbing pad 100 is provided on at least the upper or lower end surface of the coil 6. Preferably, a sound-absorbing pad 100 is provided on both the upper and lower end surfaces of the coil 6. This improves the buffering effect and achieves a better noise reduction effect.

[0034] Preferably, the sound-absorbing pad 100 is made of sound-absorbing cotton (or sound-absorbing cotton). The thickness of the sound-absorbing cotton in its natural state is preferably 0.9-1.1 mm, and after being installed inside the electromagnet, the compression under force is preferably 0.15-0.35 mm. Of course, the sound-absorbing pad 100 can also be made of other materials with cushioning effect, such as rubber pads.

[0035] like Figure 2, Figure 3 The noise-reducing pad 100 is annular, preferably circular. A positioning hole 101 is provided on the noise-reducing pad 100. The positioning hole 101 is used to engage with the bracket 62 of the coil 6 for positioning, thereby ensuring reliable installation of the noise-reducing pad 100. In this embodiment, the positioning hole 101 is a half-hole.

[0036] The bracket 62 has a positioning boss 621 at its end face. At the end near the cover plate 11, the positioning boss 621 passes through the positioning hole 101 and is embedded in the mating hole 111 on the cover plate 11. At the end away from the cover plate 11, the positioning boss 621 passes through the positioning hole 101 and is embedded in a corresponding hole on the outer wall portion 12.

[0037] See you later Figure 1 The electromagnet also includes a lead wire 200, which is used to connect to an external power source.

Claims

1. An electromagnet for switching, comprising a magnetic yoke (1), a stationary iron core (2), a moving iron core (3), and a coil (6), wherein the stationary iron core (2) is fixed on the magnetic yoke (1), the moving iron core (3) is arranged opposite to the stationary iron core (2) and can move up and down, and the coil (6) is sleeved on the moving iron core (3) and the stationary iron core (2), characterized in that: A sound-absorbing pad (100) is added between the upper end face and / or lower end face of the coil (6) and the magnetic yoke (1).

2. The electromagnet for switching according to claim 1, characterized in that: It also includes an actuating rod (4), which moves synchronously with the moving iron core (3).

3. A switching electromagnet according to claim 1 or 2, characterized in that: The coil (6) includes a winding (61) and a support (62), the winding (61) is wound on the support (62), and the silencing pad (100) is located between the end face of the support (62) and the magnetic yoke (1).

4. The electromagnet for switching according to claim 1, characterized in that: The magnetic yoke (1) includes a cover plate (11), an outer wall portion (12), and an embedded portion (13). The cover plate (11) covers the end of the outer wall portion (12). One end of the embedded portion (13) is connected to the outer wall portion (12) and extends into the electromagnet. The embedded portion (13) is fitted and cooperates with the moving iron core (3).

5. The electromagnet for switching according to claim 1, characterized in that: The sound-absorbing pad (100) is made of sound-absorbing cotton or rubber pad.

6. The electromagnet for switching according to claim 1, characterized in that: The silencing pad (100) has a thickness of 0.9 to 1.1 mm in its natural state, and is compressed to 0.15 to 0.35 mm after being installed inside the electromagnet.

7. The electromagnet for switching according to claim 1, characterized in that: It also includes a baffle (7), which is mounted on the actuating rod (4). The baffle (7) is in cooperation with a spring (5). The end of the spring (5) that is close to the moving iron core (3) abuts against the baffle (7), and the baffle (7) abuts against the actuating rod (4).

8. The electromagnet for switching according to claim 3, characterized in that: The noise-reducing pad (100) is annular and has a positioning hole (101) for positioning in conjunction with the bracket (62) of the coil (6).

9. The electromagnet for switching according to claim 8, characterized in that: The positioning hole (101) is a half hole.

10. A switching electromagnet according to claim 8, characterized in that: The bracket (62) has a positioning boss (621) at its end face. At one end of the cover plate (11) near the magnetic yoke (1), the positioning boss (621) passes through the positioning hole (101) and is embedded in the mating hole (111) on the cover plate (11).

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