CN217214330U - Electromagnetic drive device with double stroke and electromagnetic device - Google Patents

Abstract

The present disclosure relates to an electromagnetic driving apparatus and an electromagnetic device having a double stroke, the electromagnetic driving apparatus including: the magnetic control device comprises a static iron core (6), a first movable iron core (7), a second movable iron core (2) and a coil (5); when the coil (5) is electrified, the first movable iron core (7) is away from the second movable iron core (2) by a first stroke distance, and the second movable iron core (2) is away from the static iron core (6) by a second stroke distance, wherein when the coil (5) is electrified, the first movable iron core (7) firstly moves by the first stroke distance to be in contact with the second movable iron core (2), and then moves by the second stroke distance together with the second movable iron core (2) until being in contact with the static iron core (6).

Description

Electromagnetic drive device with double stroke and electromagnetic device

Technical Field

The utility model relates to an electromagnetic drive device with double-stroke and including this electromagnetic drive device's electromagnetic device.

Background

An electromagnetic drive is a type of device that produces mechanical motion under the influence of electromagnetic force to drive a load. The electromagnetic driving device generally includes a magnetic yoke, a stationary core, a coil and a movable core, wherein the coil generates electromagnetic force in a power-on state to drive the movable core to move for a certain motion stroke until the movable core contacts with the stationary core.

The existing electromagnetic driving device needs larger driving energy under the condition of being applied to a large action stroke so as to enable the movable iron core to carry out suction action, and the initial suction force value is smaller and the action time is longer.

Alternatively, an electromagnetic driving device is known, which uses a double coil to control two strokes of a movable iron core, but the electromagnetic driving device uses two coils, so that the size is large, and the motion control is complex.

Therefore, a new electromagnetic driving device with two strokes and an electromagnetic device including the electromagnetic driving device are needed, which has the advantages of small required closing energy, large initial attraction force, short action time, simple structure, small size and simple control.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem and demand, the utility model provides a novel electromagnetic drive device to and have this electromagnetic drive device's electromagnetic device, it has solved above-mentioned problem owing to adopted following technical characteristics, and bring other technological effects.

In one aspect, the present invention provides an electromagnetic driving device with two strokes, which is characterized in that the electromagnetic driving device comprises: a stationary core defining a longitudinal axis; the first movable iron core is opposite to the static iron core along the longitudinal axis; a second movable iron core; the second movable iron core is arranged between the first movable iron core and the static iron core along the longitudinal axis; and at least one part of the coil circumferentially surrounds the static iron core to provide energy required for driving the first movable iron core and the second movable iron core to move, wherein when the coil is not electrified, the first movable iron core is away from the second movable iron core by a first stroke distance, and the second movable iron core is away from the static iron core by a second stroke distance, and when the coil is electrified, the first movable iron core firstly moves by the first stroke distance to be in contact with the second movable iron core and then moves by the second stroke distance together with the second movable iron core until being in contact with the static iron core.

In some examples, the second plunger includes a rod-shaped body having a through bore provided therein, and wherein the stationary core includes a through bore through which the rod-shaped body of the second plunger passes and is disposed in the through bore and is movable relative to the stationary core.

In some examples, the electromagnetic driving device further comprises a moving rod, wherein the moving rod comprises a first part and a second part, the first part is fixedly connected with the first movable iron core, and the second part penetrates through and is arranged in an inner hole of the second movable iron core to form clearance fit and can move relative to the second movable iron core.

In some examples, an end of the second portion of the travel bar is provided with a limit feature that limits movement of the travel bar away from the second plunger.

In some examples, the second movable iron core comprises a first end and a second end which are opposite, the first end is provided with a contact part, the size of the contact part is larger than the diameter of the rod-shaped main body, and the contact part is arranged between the first movable iron core and the static iron core.

In some examples, the second end includes a limit portion that limits movement of the first end away from the stationary core.

In some examples, the electromagnetic driving device further includes a first elastic member and a second elastic member, one end of the first elastic member is connected to the first plunger, and applies a first biasing force to the first plunger along the longitudinal axis away from the stationary plunger; the second elastic element is arranged between the first movable iron core and the static iron core and applies a second biasing force far away from the static iron core to the second movable iron core along the longitudinal axis.

In some examples, the first and second elastic members are springs.

In some examples, the electromagnetic driving device further includes a coil support, the coil support includes a through hole, the stationary core is sleeved in the through hole, and the coil is wound on the coil support around the through hole.

In some examples, the electromagnetic driving device further includes a yoke surrounding the coil support, the stationary core is fixedly connected to the yoke, and the yoke and the stationary core, the first movable core, and the second movable core form a closed magnetic loop.

In some examples, the yoke includes first and second guide features opposed along the longitudinal axis, the second plunger moving along the longitudinal axis constrained by the first guide feature, the first plunger moving along the longitudinal axis constrained by the second guide feature.

In some examples, the first and second guide features are guide holes.

On the other hand, the utility model discloses still provide an electromagnetic device, include as aforesaid electromagnetic drive device.

In some examples, the electromagnetic device is at least one of a contactor, a circuit breaker, a relay, an electromagnetic trip.

The technical scheme of the utility model beneficial effect lies in: the electromagnetic driving device adopts the first movable iron core and the second movable iron core which are sequentially arranged along the longitudinal axis, reduces the magnetic resistance generated by an air gap, improves the initial attraction force, has short action time and small required closing energy, and has simple structure, small volume and simple control. In addition, the electromagnetic driving device can also realize the switching action of single and double strokes, thereby improving the reliability and the design margin of the product.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1 illustrates a top view of an electromagnetic drive apparatus according to at least one embodiment of the present disclosure.

Fig. 2 shows a cross-sectional view of the embodiment of fig. 1 along the line a-a, with the coil in an unenergized state.

Fig. 3 shows another cross-sectional view of the embodiment of fig. 1 along line a-a, wherein the first plunger has moved a first stroke distance.

Fig. 4 shows a further cross-sectional view of the embodiment of fig. 1 along line a-a, wherein the first plunger and the second plunger have moved a second stroke distance.

Fig. 5 illustrates a schematic diagram of a second plunger according to at least one embodiment of the present disclosure.

Fig. 6 illustrates a schematic diagram of a magnetic yoke, according to at least one embodiment of the present disclosure.

Fig. 7 illustrates a schematic view of a travel bar in accordance with at least one embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the embodiments of the present disclosure will be described in detail and completely with reference to the accompanying drawings of specific embodiments of the present disclosure. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Preferred embodiments of an electromagnetic driving apparatus according to the present disclosure will be described in detail below with reference to the accompanying drawings. Fig. 1 illustrates a top view of an electromagnetic drive apparatus according to at least one embodiment of the present disclosure. Fig. 2 shows a cross-sectional view of the embodiment of fig. 1 along the line a-a, with the coil in an unenergized state. Fig. 3 shows another cross-sectional view of the embodiment of fig. 1 along line a-a, wherein the first plunger has moved a first stroke distance. Fig. 4 shows a further cross-sectional view of the embodiment of fig. 1 along the line a-a, wherein the first plunger and the second plunger have moved a second stroke distance. Fig. 5 illustrates a schematic diagram of a second plunger according to at least one embodiment of the present disclosure. Fig. 6 illustrates a schematic diagram of a magnetic yoke, according to at least one embodiment of the present disclosure. Fig. 7 illustrates a schematic view of a travel bar in accordance with at least one embodiment of the present disclosure.

Possible embodiments within the scope of the disclosure may have fewer components, have other components not shown in the figures, different components, differently arranged components or differently connected components, etc. than the embodiments shown in the figures. Further, two or more of the components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components, without departing from the concepts of the present disclosure.

The existing single-stroke electromagnetic driving device comprises a magnetic yoke, a static iron core, a coil support, a movable iron core, a reset spring and the like, and is assembled by adopting a bolt, a nut or a riveting process, wherein the movable iron core is connected to an external load, the coil is connected to external voltage, and electromagnetic force is generated between the static iron core and the movable iron core so as to drive the movable iron core to move relative to the static iron core and drive the load to move. However, in some use cases requiring a large movement stroke, the switching-on energy needs to be increased, which results in a need of a larger operation voltage, but because a larger air gap exists between the static iron core and the movable iron core, the magnetic resistance is too large, which results in a smaller initial electromagnetic attraction force, and in some applications, the load cannot be driven at the initial stage.

In order to solve the problem of the existing single-stroke electromagnetic driving device, the known electromagnetic driving device adopts a parallel arrangement mode of a first movable iron core and a second movable iron core, and adopts a double coil to control the movement of the first movable iron core and the second movable iron core.

The utility model provides an electromagnetic drive device with double-stroke, on prior art's basis, increased the second stroke of middle transition, the iron core is moved to the second promptly to and corresponding second elastic component that is used for resetting, form first moving iron core, second and move the serial arrangement mode of iron core, still adopt the control mode of single coil. Due to the existence of the second movable iron core, the magnetic resistance generated by the air gap is reduced, and the second movable iron core can be freely arranged at any position between the static iron core and the first movable iron core.

When the coil is electrified, the coil generates a magnetic field, and because the air gap between the second movable iron core and the first movable iron core is obviously smaller than the air gap of the single-stroke electromagnetic driving device, the air magnetic resistance is smaller, the suction force is increased, and the action of a first stroke can be quickly finished, namely the first movable iron core is in contact joint with the second movable iron core.

Further, under the condition that the coil is kept continuously powered and the energy is unchanged, the first movable iron core and the second movable iron core form a whole under the action of the magnetic field, and the action of the second section of stroke is continuously completed until the first movable iron core contacts the static iron core and is limited by the static iron core.

For convenience of description, the stationary core 6 of the present disclosure defines a longitudinal axis D along which both the first movable core 7 and the second movable core 2 move.

As shown in fig. 1 to 7, an electromagnetic driving apparatus according to at least one embodiment of the present disclosure includes: the magnetic yoke comprises a magnetic yoke 10, a static iron core 6, a first movable iron core 7, a second movable iron core 2, a coil support 4, a coil 5, a moving rod 1, a first elastic piece 9 and a second elastic piece 8. The yoke 10 surrounds the coil support 4, the stationary core 6 is fixedly connected to one end of the yoke 10, for example, by screws or rivets, and the yoke 10 forms a closed magnetic loop with the stationary core 6, the first movable core 7, and the second movable core 2.

At least one part of the coil (5) circumferentially surrounds the static iron core 6 to provide energy required for driving the first movable iron core 7 and the second movable iron core 2 to move.

The yoke 10 is made of a magnetic metal material for constituting a magnetic circuit, may have a ring shape or a rectangular shape as shown in fig. 6, and serves as a structural support. The yoke 10 comprises a first guide feature 101 and a second guide feature 102 opposite along a longitudinal axis D along which the second plunger 2 moves constrained by the first guide feature 101 and the first plunger 7 moves constrained by the second guide feature 102.

Illustratively, as shown in fig. 6, the first guide feature 101 and the second guide feature 102 are guide holes, in particular, through guide through holes, each having a certain depth, and the second movable iron core 2 and the first movable iron core 7 respectively pass through the guide holes and move linearly along the longitudinal axis D under the constraint of the guide holes.

Illustratively, the first plunger 7 and the second plunger 2 can be guided by the yoke 10, but may also be guided by an additional support, and the disclosure is not limited thereto.

The stationary core 6 is also made of a magnetic conductive metal material. The coil support 4 comprises a through hole, and the static iron core 6 is sleeved in the through hole. The coil bracket 4 is wound with a coil 5 around the through hole to provide energy required for driving the first movable iron core 7 and the second movable iron core 2 to move.

As shown in fig. 5, the stationary core 6 includes a through hole 61 along the longitudinal axis D, and the second movable core 2, in particular, the rod-shaped body 24 of the second movable core 2 is inserted through and disposed in the through hole 61 and is movable relative to the stationary core 6. That is, the second movable core 2 is in clearance fit with the through hole 61 of the stationary core 6, and can slide smoothly along the through hole 61.

One end of the first elastic member 9 is connected to the first movable iron core 7, and applies a first biasing force away from the stationary iron core to the first movable iron core 7 along the longitudinal axis D for holding the first movable iron core 7 at the release position or moving the first movable iron core 7 to the release position when the coil 5 is not energized. Similarly, a second elastic member 8 is disposed between the stationary core 6 and the second movable core 2, and applies a second biasing force to the second movable core 2 along the longitudinal axis D away from the stationary core 6 for holding the second movable core 2 in the release position when the coil 5 is not energized, or moving the second movable core 2 to the release position. In the embodiment shown in fig. 2 to 4, the first elastic member 9 is disposed between the stationary core 6 and the first movable core 7, i.e., one end is connected to the first movable core 7 and the other end is connected to the stationary core 6. Alternatively, the first elastic member 9 may be disposed outside the yoke 10 while the other end is connected to an external fixing member.

Illustratively, the first elastic member 9 and the second elastic member 8 are both springs. Alternatively, the first elastic member 9 and the second elastic member 8 may also adopt other elements having elasticity known in the art.

It should be noted that the "release position" referred to herein refers to the farthest distance between the first movable iron core 7 and the second movable iron core 2 and the stationary iron core 6 when the coil 5 is not energized. As shown in fig. 2, when the coil 5 is not energized, at this time, the first movable iron core 7 and the second movable iron core 2 are in the release position, the first movable iron core 7 is at a first stroke distance L1 from the second movable iron core 2, and the second movable iron core 2 is at a second stroke distance L2 from the stationary iron core 6.

The moving rod 1 comprises a non-magnetic material, such as stainless steel metal, comprising a first part and a second part, the first part being fixedly connected to the first plunger 7. Illustratively, as shown in fig. 7, the first portion may include a mounting hole 12, and the first plunger 7 is fixedly connected to the movable rod 1 by rivet or screw coupling with the mounting hole 12. The second part of the moving rod 1 passes through and is disposed in the inner bore 22 of the second plunger 2 to form a clearance fit and is movable relative to the second plunger 2.

The end of the second part of the travel bar 1 may be provided with a stop feature 11, the stop feature 11 limiting the movement of the travel bar 1 away from the second plunger 2. The limit feature 11, which may be in the form of a screw or rivet, for example, constitutes a limit feature with the end of the second movable iron core 2 to limit the movement of the movable rod 1 and thus the first movable iron core 7 to the release position furthest with respect to the stationary iron core 6. Has a limiting feature 11 for limiting the movement, which is usually formed with the end of the second plunger 2. The main body 13 of the movable rod 1 is cylindrical and can form a clearance-fit moving pair along the second movable iron core 2.

As shown in fig. 5, the second plunger 2 may include a rod-shaped body 24 and opposite first and second ends. The rod-like body 24 has a through-hole 22 formed therein, and the travel bar 1 is slidably inserted through the through-hole 22. The first end is provided with a contact portion 23, the size of the contact portion 23 is larger than the diameter of the rod-shaped body 24, and the contact portion 23 is disposed between the first movable iron core 7 and the stationary iron core 6. The contact portion 23 provides a magnetic surface required for attraction to generate an attraction force action on the first plunger 7. The second end of the second movable iron core 2 comprises a limiting part 21 for positioning with the magnetic yoke 10, and the limiting part 21 limits the movement of the first end away from the stationary iron core 6, for example, the second movable iron core 2 is limited to move farthest relative to the stationary iron core 6 to a release position. The stopper 21 may be a nut stopper or a rivet stopper, for example.

Fig. 2 to 4 show cross-sectional views of the embodiment of fig. 1 along the line a-a. The operation principle of the electromagnetic driving device according to the embodiment of the present disclosure is described below with reference to fig. 2 to 4.

As shown in fig. 2, when the power supply energizes the coil 5, magnetic flux is generated in the yoke 10, the stationary core 6 and the first movable core 7, and then magnetic force is generated to generate attraction force on the first movable core 7, so that the first movable core 7 overcomes the resistance of the first elastic member 9, moves by a first stroke distance L1 to contact and attach to the second movable core 2, and completes the first stroke.

As shown in fig. 3, when the power supply continuously supplies power to the coil 5, under the action of the magnetic force, the first movable iron core 7 and the second movable iron core 2 will move together toward the direction of the stationary iron core 6, and continue to compress the first elastic member 9 and the second elastic member 8, respectively, and finally move by the second stroke distance L2 and contact and attach to the stationary iron core 6.

Compared with a single-stroke electromagnetic driving device with a similar structure but without a second movable iron core, the distance between the movable iron core and the stationary iron core is, for example, the sum of L1 and L2, and the air gap between the movable iron core and the stationary iron core is larger. The second stroke of intermediate transition, namely the second movable iron core, is increased, and the serial arrangement mode of the first movable iron core and the second movable iron core is formed. Although the single-coil control mode is still adopted, due to the existence of the second movable iron core, the magnetic resistance generated by the air gap is reduced, the initial attraction force is improved, the action time is short, the required closing energy is small, and meanwhile, the structure is simple, the size is small, and the control is simple.

When the coil 5 is de-energized or not energized, the first movable iron core 7 and the second movable iron core 2 are respectively restored to the release position under the biasing force of the first elastic member 9 and the second elastic member 8.

Advantageously, the electromagnetic driving device provided by the present disclosure can also realize single-stroke and double-stroke control if appropriate electronic control technology is adopted to control the energization time and energization energy of the coil. That is, by selecting an appropriate energization time and energization voltage, the operation of the second stage stroke can be started immediately without a time interval at the moment when the first plunger and the second plunger are brought into contact and bonded, and the operation of the single stroke motion can be expressed.

The electromagnetic driving device with the double stroke can obviously reduce the closing action voltage. For example, the minimum operating voltage of an electromagnetic drive with a double stroke is reduced by 18V (e.g., from 173V to 155V) relative to a single stroke electromagnetic drive while maintaining the same structure (coil parameters, plunger, yoke, and stroke) as the single stroke electromagnetic drive.

In addition, the embodiment of the present disclosure also provides an electromagnetic device, which includes the electromagnetic driving apparatus as described above. Alternatively, the electromagnetic device may be at least one of a contactor, a circuit breaker, a relay, an electromagnetic trip. For example, the electromagnetic device may be a vacuum contactor or a circuit breaker trip.

To sum up, the embodiment of the utility model provides an electromagnetic drive device and electromagnetic device with double-stroke, this electromagnetic drive device adopts the first iron core and the second that moves that sets gradually along longitudinal axis to move the iron core, has reduced the magnetic resistance that the air gap produced, improves initial suction, and action time is short and required combined floodgate energy is little, simple structure, small, control simple simultaneously. In addition, the electromagnetic driving device can also realize the switching action of single and double strokes, thereby improving the reliability and the design margin of the product.

The above description is only for the specific embodiments of the present disclosure, but the scope of the embodiments of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes, substitutions or combinations within the technical scope of the embodiments of the present disclosure or under the concept of the embodiments of the present disclosure, and all of them should be covered by the scope of the embodiments of the present disclosure.

Claims (14)

1. An electromagnetic drive having a dual stroke, the electromagnetic drive comprising:

a stationary core (6), the stationary core (6) defining a longitudinal axis (D);

a first moving core (7), said first moving core (7) being opposite to said stationary core (6) along said longitudinal axis (D);

a second movable iron core (2); the second movable iron core (2) is arranged between the first movable iron core (7) and the stationary iron core (6) along the longitudinal axis (D); and

a coil (5), at least one part of the coil (5) circumferentially surrounds the static iron core (6) to provide energy required for driving the first movable iron core (7) and the second movable iron core (2) to move,

wherein, when the coil (5) is not electrified, the first movable iron core (7) is at a first stroke distance (L1) from the second movable iron core (2), the second movable iron core (2) is at a second stroke distance (L2) from the static iron core (6),

when the coil (5) is electrified, the first movable iron core (7) firstly moves a first stroke distance (L1) to be in contact with the second movable iron core (2), and then moves a second stroke distance (L2) together with the second movable iron core (2) until being in contact with the static iron core (6).

2. The electromagnetic drive according to claim 1, characterized in that the second plunger (2) comprises a rod-shaped body (24), in which a through-going inner hole (22) is provided in the rod-shaped body (24), and wherein the stationary core (6) comprises a through-going hole (61), in which through-going hole (61) the rod-shaped body (24) of the second plunger (2) passes and is provided, and is movable relative to the stationary core (6).

3. The electromagnetic drive of claim 2, further comprising:

the moving rod (1) comprises a first part and a second part, the first part is fixedly connected with the first movable iron core (7), and the second part penetrates through and is arranged in an inner hole (22) of the second movable iron core (2) to form clearance fit and can move relative to the second movable iron core (2).

4. The electromagnetic drive according to claim 3, characterized in that the end of the second portion of the mobile rod (1) is provided with a limit feature (11), said limit feature (11) limiting the movement of the mobile rod (1) away from the second plunger (2).

5. The electromagnetic drive according to claim 2, characterized in that said second mobile core (2) comprises a first and a second opposite end, said first end being provided with a contact portion (23), said contact portion (23) having a size greater than the diameter of said rod-shaped body (24), and said contact portion (23) being arranged between said first mobile core (7) and said stationary core (6).

6. The electromagnetic drive according to claim 5, characterized in that the second end comprises a limiting portion (21), the limiting portion (21) limiting the movement of the first end away from the stationary core (6).

7. The electromagnetic drive device according to any one of claims 1 to 6, characterized by further comprising:

a first elastic member (9), one end of the first elastic member (9) being connected to the first movable iron core (7) and applying a first biasing force to the first movable iron core (7) along the longitudinal axis (D) away from the stationary iron core; and

a second elastic member (8), the second elastic member (8) being disposed between the first movable core (7) and the stationary core (6), and applying a second biasing force to the second movable core (2) along the longitudinal axis (D) away from the stationary core (6).

8. An electromagnetic actuating device according to claim 7, wherein said first elastic member (9) and said second elastic member (8) are springs.

9. The electromagnetic drive of claim 1, further comprising:

the coil support (4), the coil support (4) includes the through-hole, quiet iron core (6) cover is established in the through-hole, coil (5) center on the through-hole coiling is in on the coil support (4).

10. The electromagnetic drive of claim 9, further comprising:

the coil support (4) is surrounded by the magnetic yoke (10), the static iron core (6) is fixedly connected to the magnetic yoke (10), and the magnetic yoke (10), the static iron core (6), the first movable iron core (7) and the second movable iron core (2) form a closed magnetic loop.

11. The electromagnetic driving device according to claim 10, characterized in that the yoke (10) comprises a first guide feature (101) and a second guide feature (102) opposite along the longitudinal axis (D), the second mobile core (2) moving along the longitudinal axis (D) constrained by the first guide feature (101), the first mobile core (7) moving along the longitudinal axis (D) constrained by the second guide feature (102).

12. The electromagnetic drive of claim 11, characterized in that the first guide feature (101) and the second guide feature (102) are guide holes.

13. An electromagnetic device, characterized by comprising an electromagnetic drive apparatus as claimed in any one of claims 1 to 12.

14. The electromagnetic device of claim 13, wherein the electromagnetic device is at least one of a contactor, a circuit breaker, a relay, an electromagnetic trip.

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