CN212411982U - Magnetic driving mechanism and electric switch with same - Google Patents

Abstract

The utility model relates to a magnetic drive mechanism, including armature and relative yoke with it, the yoke is installed and is related the position of the conductor that detects to be used for concentrating the restraint the electromagnetic field of conductor, armature carries out coupling connection with the portion of actuating of the electric mechanism that needs realize the function through the displacement, with be used for quilt the yoke carries out the magnetism and attracts to drive with self displacement after attaching actuating the portion, the yoke has the orientation the first extension position that armature extends, armature has the orientation the second that the yoke extends the position, yoke and armature borrow by first extension position with the second extends the position and is close to each other and misplaces each other. The utility model discloses still relate to an electrical switch, have foretell magnetic drive mechanism. The invention reduces the air gap between the initial position of the armature and the magnetic yoke and improves the initial attraction by the design of the mutually extending parts of magnetic attraction.

Description

Magnetic driving mechanism and electric switch with same

Technical Field

The utility model relates to a magnetic drive mechanism and have electrical switch of this mechanism, more specifically relate to the institutional advancement of armature and yoke.

Background

The circuit breaker is a switching device widely applied to a power distribution system, when a circuit has faults such as overload, short circuit, undervoltage and the like, the circuit breaker needs to be capable of quickly cutting off the circuit so as to prevent components from being burnt under overlarge current, so that the circuit breaker is generally provided with a quick tripping mechanism to quickly break the circuit, and the speed of tripping and tripping directly influences the capacity of the circuit breaker for cutting off fault current. The thermal magnetic trip is a trip mechanism commonly used in the field of current circuit breakers, and is used for converting received magnetic excitation and/or thermal deformation into a driving force for driving a circuit breaker locking mechanism to trip, for example, a common magnetic trip is provided with an armature, when a circuit breaker has faults such as overload or short circuit, a magnetic yoke on the thermal magnetic trip is magnetized, the armature is attracted to act, the armature is moved, the locking mechanism is triggered to unlock, a trip switch trips, and a fault circuit is cut off.

However, this kind of magnetic release has a certain defect, when the short-circuit current appears in the circuit, the yoke of the magnetic release needs to be magnetized for a certain time to generate magnetic force, then attracts the armature to act, finally, the switch cuts off the fault current by striking the locking mechanism to release, not only needs to pass 2-stage mechanical transmission, but also the armature of the magnetic release is far away from the yoke in the conventional technology (the air gap between the armature and the yoke is large), which results in smaller initial attraction force of the yoke to the armature, and the action of the armature is not rapid enough, so the action response speed of the magnetic release is slow, which results in longer time of the fault current existing, and affects the system safety. In addition, magnetic trips are often complicated in structure and have a large number of parts.

SUMMERY OF THE UTILITY MODEL

Therefore, to the above problem, the utility model provides a magnetic drive mechanism of configuration optimization.

The utility model discloses a following technical scheme realizes:

the utility model provides a magnetic drive mechanism, including armature and relative yoke with it, the yoke is installed in the position that the association carries out the conductor that detects to be used for concentrating the restraint the electromagnetic field of conductor, armature carries out coupling connection with the portion of actuating of the electric mechanism that needs realize the function through the displacement, with be used for quilt the yoke carries out the magnetism and attracts to drive with self displacement after attaching actuating the portion, the yoke has the orientation the first extension position that armature extends, armature has the orientation the second that the yoke extends the position, yoke and armature borrow by first extension position with the second extends the position and is close to each other and misplaces each other.

In order to ensure that the armature and the magnetic yoke can have large relative displacement and the extending positions of the armature and the magnetic yoke are as close as possible, in one implementation, the minimum interval between the first extending position and the second extending position is defined as sigma, the maximum displacement distance between the magnetic yoke and the armature is defined as s, and the minimum interval is sigma < the maximum displacement distance s.

In one embodiment, the yoke has a substantially U-shaped structure including a first base and two first magnetic conductive teeth extending substantially perpendicularly from both sides of the first base as the first extending portions, and the armature has a substantially U-shaped structure including a second base and two second magnetic conductive teeth extending substantially perpendicularly from both sides of the second base as the second extending portions, and the U-shaped structures of the yoke and the armature are respectively large and small, so that the yoke and the armature are close to and displaced from each other by the first and second magnetic conductive teeth achieving a minimum separation of σ, and the yoke and the armature achieve a maximum displacement distance s by the first and second magnetic conductive teeth or the second magnetic conductive teeth and the first base.

In order to facilitate installation of the conductor and simultaneously realize the electromagnetic field for intensively restraining the conductor, in one implementation, the magnetic yoke is used for semi-surrounding the conductor for detection through a roughly U-shaped structure formed by the first base body and the first magnetic conductive tooth so as to carry out magnetic field correlation.

In order to improve the displacement stability after the magnetic yoke is absorbed, in one embodiment, the armature is fixedly overlapped on the actuating part through a roughly U-shaped structure formed by the second base body and the second magnetic conduction tooth so as to be coupled.

Based on foretell magnetic drive mechanism, the utility model discloses still provide an electrical switch, include the electric mechanism and the electric circuit that realize the function through the displacement, the electric circuit has a conductor that detects, still includes as above magnetic drive mechanism.

Preferably, in one embodiment, the electrical switch is a circuit breaker, the electrical mechanism is a latch mechanism, and the actuating portion is a trigger portion of the latch mechanism

Preferably, in one embodiment, the electrical switch is a contactor, the electrical mechanism is a contact system, and the actuating portion is a movable contact of the contact system

The utility model discloses following beneficial effect has: the utility model discloses a set up magnetic drive mechanism, need actuate through the electric mechanism that the displacement realized the function through magnetic force actuation direct drive, improved mechanical transmission efficiency, reduced mechanism response time. The design of the mutually extending parts reduces the air gap between the initial positions of the armature and the magnetic yoke and improves the initial attraction force. In the application of the circuit breaker, the tripping time of the locking mechanism can be effectively reduced, and the fault circuit breaking capacity and reliability of the circuit breaker are improved.

Drawings

Figure 1 is a schematic diagram of an embodiment of a circuit breaker;

FIG. 2 is a perspective view of an armature of an embodiment;

FIG. 3 is a perspective view of a yoke in the embodiment;

FIG. 4 is a schematic illustration of an embodiment in which the armature is connected to a trip half shaft;

FIG. 5 is a schematic view (one) of the magnetic conductive teeth of the armature and yoke of the embodiment;

fig. 6 is a schematic view (two) of the magnetic conductive teeth of the armature and the yoke in the embodiment;

fig. 7 is (one of) a schematic view of another possible arrangement of the magnetic teeth of the armature and yoke in the embodiment;

fig. 8 is a schematic view (two) of another possible arrangement of the magnetic teeth of the armature and the yoke in the embodiment;

fig. 9 is a schematic view (third) of another possible arrangement of the magnetic teeth of the armature and the yoke in the embodiment;

fig. 10 is a schematic view (fourth) of another possible arrangement of the magnetic teeth of the armature and yoke according to the embodiment.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1, as a preferred embodiment of the present invention, there is provided a circuit breaker, which includes a housing (not completely shown), an operating mechanism 2, a contact system 3, a latch mechanism 4, a release 15 and an arc extinguishing system (not shown) mounted on the housing, wherein the contact system 3 has a first terminal 10 and a second terminal 11 at two sides thereof, which are used as connection terminals of the circuit breaker, and simultaneously form an electrical circuit of the circuit breaker together with the contact system 3; the operating mechanism 2 controls the contact system 3 to move so as to realize the connection and disconnection of the first terminal 10 and the second terminal 11; the arc extinguishing system is positioned below the contact system 3 and is used for carrying out arc extinguishing treatment on the electric arc generated when the circuit breaker is disconnected; the latch mechanism 4 includes a tripping half shaft 41 and a tripping plate 42, the tripping plate 42 is lapped on the tripping half shaft 41, and when the tripping half shaft 41 is triggered to rotate, the tripping plate 42 can be tripped from the tripping half shaft 41, so that the circuit breaker is tripped and the fault current is cut off.

The trip half shaft 41 has a trigger portion for receiving an external force to rotate the trip half shaft 41, and referring to fig. 2, the trigger portion is a dial 4162, and the dial 4162 is a flat plate structure extending radially from the trip half shaft 41. In particular, the present embodiment provides a magnetic release 15 for generating a driving force to trigger the shift piece 4162 to rotate the trip half shaft 41, and referring to fig. 1, the magnetic release 15 includes an armature 151 and a magnetic yoke 152, and the basic requirements of the magnetic yoke 152 are: is mounted in a position associated with the conductor being detected (i.e. the second terminal 11) for intensively confining the electromagnetic field of said conductor (i.e. the second terminal 11); the basic requirements of the armature 151 are: the driving portion (i.e., the shifting piece 4162) of the electrical mechanism (i.e., the latch mechanism 4) that needs to realize the function by displacement is coupled (i.e., contact type mechanical connection or non-contact type transmission connection) to drive the driving portion (i.e., the latch mechanism 4) by its own displacement after being magnetically attracted by the magnetic yoke 152. The following detailed description is given by way of specific example applications:

referring to fig. 2-3, the armature 151 and the magnetic yoke 152 are disposed opposite to each other, and the magnetic yoke 152 is substantially in a "U" shape, and includes a first base 1520 and two first magnetic conductive teeth 1521 extending substantially perpendicularly from two sides of the first base 1520; the armature 151 is substantially in a "U" shape, and includes a second base 1510 and two second magnetic conductive teeth 1511 extending substantially vertically from two sides of the second base 1510, referring to fig. 5, the "U" shape structures of the armature 151 and the magnetic yoke 152 are respectively large and small, in this embodiment, the "U" shape structure of the magnetic yoke 152 is larger, and the "U" shape structure of the armature 151 is smaller, so that the first magnetic conductive teeth 1521 and the second magnetic conductive teeth 1511 are offset from each other at a certain interval, it is obvious that in other embodiments, the "U" shape structure of the magnetic yoke 152 may be smaller, and the "U" shape structure of the armature 151 is larger, and the offset effect is the same. Referring to fig. 4 and 5, the armature 151 is fixedly attached (e.g., bonded) to the first tab 4161 of the trip half shaft 41, and the yoke 152 is connected to the second terminal 11 in a half-surrounding manner by its "U" -shaped configuration, thereby performing magnetic field correlation with the second terminal 11 as a conductor. When the circuit has fault current (such as short circuit), the magnetic yoke 152 semi-surrounding the second terminal 11 generates enough magnetic force to attract the armature 151, so as to drive the tripping half shaft 4 to rotate, and the tripping piece 42 is tripped, so that the switch is tripped quickly, the fault circuit is cut off, and the safety operation of the protection system is realized. The second magnetic conductive tooth 1511 and the first magnetic conductive tooth 1521 which are arranged in a staggered manner not only make way of the movement space of the armature 151, but also reduce the air gap between the armature 151 and the magnetic yoke 152 because the second magnetic conductive tooth 1511 and the first magnetic conductive tooth 1521 extend close to each other, as shown in fig. 6, the air gap between the armature 151 and the magnetic yoke 152 can be reduced from L (in the case of no magnetic conductive tooth design) to σ by the design of the second magnetic conductive tooth 1511 and the first magnetic conductive tooth 1521.

In a more preferred embodiment, the minimum distance between the second magnetic conductive tooth 1511 and the first magnetic conductive tooth 1521 is σ < the maximum displacement distance s between the armature 151 and the yoke 152, and with such a design, while ensuring a large relative displacement between the armature 151 and the yoke 152, the extension portions of the armature 151 and the yoke (i.e., the second magnetic conductive tooth 1511 and the first magnetic conductive tooth 1521) can be made as close as possible to make the initial air gap therebetween smaller, and the initial magnetic attraction force applied to the armature 151 greater, thereby reducing the response time of the mechanism.

In this embodiment, the magnetic release 15 is designed to be composed of only two parts, namely an armature and a magnetic yoke, so that the number of parts is greatly reduced, and the reliability of the operation is improved. The magnetic release directly drives the locking mechanism 4 to be unlocked through magnetic attraction, so that the mechanical transmission efficiency is improved, the mechanism response time is reduced, the air gap between the armature and the initial position of the magnetic yoke is reduced due to the arrangement of the magnetic conduction tooth structure, the initial attraction is improved, the mechanism unlocking time is reduced, and the breaking fault circuit capacity and reliability of a product are improved.

And, the second magnetic conductive tooth 1511 and the first magnetic conductive tooth 1521 are substantially designed to have extending portions extending toward each other and dislocated from each other on the armature 151 and the yoke 152, so as to make a movement space of the armature 151 available and reduce an initial air gap between the armature 151 and the yoke 152, based on which, the present embodiment also proposes several alternatives of the magnetic release 15:

1. alternative 1: referring to fig. 7, the magnetic release includes an armature 151 and a yoke 153, the armature 151 has a second magnetic conductive tooth 1511, the yoke 153 has a magnetic conductive tooth 1531, the second magnetic conductive tooth 1511 and the magnetic conductive tooth 1531 are offset from each other, and in particular, the magnetic conductive tooth 1531 is located inside the second magnetic conductive tooth 1511.

2. Alternative 2: referring to fig. 8, the magnetic release includes an armature 151 and a magnetic yoke 154, the armature 151 has a second magnetic conductive tooth 1511, the magnetic yoke 154 has a protruding pillar 1541, the second magnetic conductive tooth 1511 and the protruding pillar 1541 are staggered, and the protruding pillar 1541 is located inside the second magnetic conductive tooth 1511.

3. Alternative 3: referring to fig. 9, the magnetic release includes an armature 155 and a magnetic yoke 152, the armature 155 has a protrusion 1551, the magnetic yoke 152 has a first magnetic conductive tooth 1521, the protrusion 1551 and the first magnetic conductive tooth 1521 are staggered, and the protrusion 1551 is located inside the first magnetic conductive tooth 1521.

4. Alternative 4: referring to fig. 10, the magnetic release includes an armature 156 and a magnetic yoke 152, the armature 156 has a magnetic conductive tooth 1561, the magnetic yoke 152 has a first magnetic conductive tooth 1521, the magnetic conductive tooth 1561 and the first magnetic conductive tooth 1521 are staggered, and the magnetic conductive tooth 1561 is located inside the first magnetic conductive tooth 1521.

On the whole, the four schemes are realized by that the magnetic yoke and the armature respectively have a concave structure and a convex structure, or the magnetic yoke and the armature respectively have a convex structure and a concave structure, so that the space is fully utilized, and the conditions that the magnetic yoke and the armature extend towards each other and are mutually staggered are realized.

The armature 151 and the yoke 152 in the preferred embodiment are U-shaped, which has the advantages of simple and reliable structure and easy manufacture, such as being conveniently mounted on the pick 4162 or the second terminal 11, and if the yoke and the armature in the above 4 alternative embodiments are used, a more detailed structure can be designed according to the practical application requirement to realize the magnetic field-related mounting of the conductor for detecting the yoke, such as the conductor (the second terminal 11) can be mounted between the two magnetic conductive teeth 1531 in the alternative 1, and further such as the conductor (the second terminal 11) can be mounted by drilling in the convex column 154 in the alternative; similarly, a more detailed structure can be designed according to the practical application requirement to realize the coupling connection between the armature and the actuating portion of the electrical mechanism that needs to realize the function through displacement, as in the alternative 1 and the alternative 2, the armature 151 may be fixedly overlapped on the dial 4162 in a semi-surrounding manner (i.e., the solution adopted in the preferred embodiment), and the armatures 155 and 156 in the alternative 3 and the alternative 4 may be adhered to the dial 4162 at the flat upper ends thereof.

In addition, the magnetic trip mechanism is described by taking the example of the application to the circuit breaker according to the embodiment. However, the magnetic trip mechanism is an electromagnetic energy-mechanical energy conversion motion mechanism for converting current into magnetic force to drive the armature to realize displacement motion, and the magnetic trip mechanism can be used in some occasions where electromagnetic energy-mechanical energy conversion motion is required; for example, in the contactor, the armature drives the moving contact to move through the fixed connection structure, so that the function of the contactor is realized, the traditional armature and magnetic yoke structure is replaced, and the technical effects of improving the action reliability, improving the initial suction force and acting more quickly in the improved structure are achieved.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A magnetic driving mechanism comprises an armature and a magnetic yoke opposite to the armature, wherein the magnetic yoke is installed at the position of a conductor which is associated to detect so as to be used for intensively restricting the electromagnetic field of the conductor, the armature is coupled and connected with an actuating part of an electric mechanism which needs to realize functions through displacement so as to drive the actuating part with self displacement after being magnetically attracted by the magnetic yoke, and the magnetic driving mechanism is characterized in that: the yoke has a first extension portion extending toward the armature, the armature has a second extension portion extending toward the yoke, and the yoke and the armature are close to each other and are offset from each other by the first extension portion and the second extension portion.

2. The magnetic drive mechanism of claim 1, wherein: and defining the minimum interval between the first extension part and the second extension part as sigma, and the maximum displacement distance between the magnetic yoke and the armature as s, wherein the minimum interval is sigma < the maximum displacement distance s.

3. The magnetic drive mechanism of claim 2, wherein: the magnetic yoke is approximately in a U-shaped structure and comprises a first base body and two first magnetic conduction teeth which are approximately vertically extended from two sides of the first base body and are used as first extension parts, the armature is approximately in a U-shaped structure and comprises a second base body and two second magnetic conduction teeth which are approximately vertically extended from two sides of the second base body and are used as second extension parts, the U-shaped structures of the magnetic yoke and the armature are respectively in a large size and a small size, so that the magnetic yoke and the armature are close to each other and are staggered with each other by the aid of the first magnetic conduction teeth and the second magnetic conduction teeth, and the magnetic yoke and the armature are in maximum displacement distance s by the aid of the space between the first magnetic conduction teeth and the second base body or the space between the second magnetic conduction teeth and the first base body.

4. A magnetic drive mechanism according to claim 3, wherein: the magnetic yoke is used for carrying out magnetic field correlation by semi-surrounding the conductor for detection through a roughly U-shaped structure formed by the first base body and the first magnetic conduction tooth.

5. A magnetic drive mechanism according to claim 3, wherein: the armature is fixedly overlapped on the actuating part through a roughly U-shaped structure formed by the second base body and the second magnetic conduction tooth so as to be coupled.

6. The magnetic drive mechanism of claim 1, wherein: the magnetic yoke and the armature are respectively in a concave structure and a convex structure.

7. An electrical switch comprising an electrical mechanism functioning by displacement and an electrical circuit having a conductor for detection, characterized in that: further comprising a magnetic drive mechanism as claimed in any of the claims 1-6.

8. The electrical switch of claim 7, wherein: the electrical switch is a circuit breaker, the electrical mechanism is a latch mechanism, and the actuating portion is a trigger portion of the latch mechanism.

9. The electrical switch of claim 7, wherein: the electrical switch is a contactor, the electrical mechanism is a contact system, and the actuating portion is a moving contact of the contact system.

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