CN215988616U - Electromagnetic mechanism of circuit breaker - Google Patents

Abstract

The utility model discloses an electromagnetic mechanism of a circuit breaker, which relates to the field of circuit breakers and comprises a shell, a coil assembly and an iron core assembly, wherein the coil assembly comprises a coil and a static contact, the iron core assembly comprises a movable iron core, a static iron core and an ejector rod, an installation position for the movable iron core to be installed in a sliding mode is arranged on the shell, an elastic piece for abutting against the ejector rod and the static iron core is arranged between the ejector rod and the static iron core, one end, far away from the static iron core, of the ejector rod is in contact fit with the movable iron core through the pretightening force of the elastic piece, the static iron core is provided with a first through hole for the ejector rod to penetrate through, and the coil is arranged on the outer circumferences of the movable iron core and the static iron core in a surrounding and non-contact mode. The electromagnetic mechanism has the advantages of low cost, few parts, convenience in installation, reasonable internal layout and remarkable reduction of the overall size of the electromagnetic mechanism.

Description

Electromagnetic mechanism of circuit breaker

Technical Field

The utility model relates to the field of circuit breakers, in particular to an electromagnetic mechanism of a circuit breaker.

Background

The breaker is a switch capable of providing various protection functions, and can effectively improve the safety and reliability of electrical equipment and power lines. In order to meet the increasingly diversified demands of users, specification diversification and miniaturization of circuit breakers are a trend; at present, an electromagnetic mechanism of a traditional circuit breaker generally adopts a mode of adding a coil framework outside a movable iron core and a fixed iron core to separate the coil and the movable iron core, so that unstable action characteristics of a product caused by the contact of the movable iron core and the coil when the movable iron core moves are avoided; or the movable iron core and the ejector pin in the electromagnetic mechanism without the coil framework are fixed by adopting a riveting fixing mode, the movable iron core is prevented from contacting with the coil in the movement process, enough riveting strength is ensured between the movable iron core and the ejector pin without falling and breaking, the movable iron core must have enough depth and wall thickness, the ejector pin must also have enough diameter to ensure that the riveting is not deformed and broken, the whole volume of the electromagnetic mechanism in the two modes is larger, the assembly is complex, the electromagnetic mechanism generally needs 18mm space to be placed in the height direction, and the requirement of the miniaturization of the volume of the circuit breaker cannot be met.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the background technology, the utility model provides the electromagnetic mechanism of the circuit breaker, which has the advantages of low cost, few parts, convenient installation, reasonable internal layout and obvious reduction of the whole volume of the electromagnetic mechanism.

The technical scheme adopted by the utility model is as follows: the utility model provides an electromagnetic mechanism of circuit breaker, its includes shell, coil pack and iron core assembly, the coil pack include coil and static contact, the iron core assembly including moving iron core, quiet iron core and ejector pin, be equipped with the installation position that supplies to move the iron core and slide the installation on the shell, be equipped with the elastic component of contradicting the two between ejector pin and the quiet iron core, the one end that the quiet iron core was kept away from to the ejector pin utilize the pretightning force of elastic component with move the iron core contact cooperation, quiet iron core is equipped with the first through-hole that supplies the ejector pin to run through, the coil encircles and contactless setting and is in move the outer circumference unshakable in one's determination and quiet iron core.

The movable iron core is provided with a mounting groove for inserting one end of a push rod, the static iron core is internally provided with an annular step arranged around the push rod, one end of the push rod in the mounting groove is provided with an annular boss, and the elastic piece is sleeved on the push rod and two ends of the elastic piece respectively abut against the annular step and the annular boss.

The static contact is fixedly installed in the shell, the static contact is provided with an installation hole for installing one end of a static iron core, and the static iron core is fixedly connected with the static contact.

The magnetic yoke is U-shaped and is arranged in the shell, the side wall of one side of the magnetic yoke is provided with a second through hole for the static iron core to pass through, and the side wall of the other side of the magnetic yoke is provided with an avoiding hole for avoiding the moving iron core and the static iron core.

The movable iron core is columnar, and the part of the movable iron core positioned in the installation position is narrowed.

The ejector rod is made of aluminum alloy or copper alloy.

The utility model has the beneficial effects that: according to the technical scheme, the elastic piece is sleeved into the ejector rod, one end of the elastic piece is abutted against the movable iron core through the ejector rod, one end of the elastic piece is pressed in the static iron core, one end of the ejector rod is contacted with the movable iron core, the other end of the ejector rod penetrates into the static iron core hole, the assembled electromagnetic mechanism is assembled in the shell, one end of the movable iron core is slidably assembled in the installation position of the shell, the other end of the movable iron core is fixedly suspended in the coil through the ejector rod and the elastic piece, the movable iron core is not contacted with the coil, a coil framework in the traditional electromagnetic mechanism is removed, and the movable iron core is not required to be separated by the coil framework to keep the action characteristic of the product stable; and the movable iron core and the coil can be free of contact without adopting a mode of riveting and fixing the movable iron core and the ejector rod. The ejector pin among the tradition adopts engineering plastics usually, and the ejector pin of this scheme adopts aluminum alloy or copper alloy, can keep the intensity of ejector pin when reducing the ejector pin diameter, and the reduction of ejector pin diameter drives the reduction of sound iron core diameter simultaneously. Therefore, the technical scheme comprehensively reduces the whole volume of the electromagnetic mechanism, reduces parts, reduces the cost and is convenient to install.

Drawings

Fig. 1 is a schematic structural diagram of an electromagnetic mechanism of a circuit breaker according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a core assembly.

Fig. 3 is a schematic structural view of the yoke.

Fig. 4 is a schematic structural diagram of a fixed contact.

Detailed Description

The embodiments of the utility model will be further described with reference to the accompanying drawings in which:

as shown in the figure, the electromagnetic mechanism of the circuit breaker comprises a shell 1, a coil assembly and an iron core assembly, wherein the coil assembly comprises a coil 4 and a static contact 5, the iron core assembly comprises a movable iron core 6, a static iron core 7 and an ejector rod 8, an installation position 11 for the movable iron core 6 to be installed in a sliding mode is arranged on the shell 1, an elastic part 9 for abutting against the movable iron core 6 and the static iron core 7 is arranged between the ejector rod 8 and the static iron core 7, one end, far away from the static iron core 7, of the ejector rod 8 is in contact fit with the movable iron core 6 through the pretightening force of the elastic part 9, the static iron core 7 is provided with a first through hole 71 for the ejector rod 8 to penetrate through, and the coil 4 is arranged on the outer circumferences of the movable iron core 6 and the static iron core 7 in a surrounding and non-contact mode; this technical scheme is through inciting somebody to action the iron core slides and installs in the installation position of shell, and the ejector pin is gone into to the elastic component cover, and one end is contradicted through the ejector pin and is moved the iron core, and one end is pressed in quiet iron core, ejector pin one end with move the contact of iron core, during one end penetrates quiet iron core hole, will move iron core contactless setting in the coil through ejector pin and shell, move iron core and coil contactless, got rid of the coil skeleton in traditional electromagnetic mechanism, reduced electromagnetic mechanism's whole volume.

The mounting position adopts a sliding groove, and the elastic part adopts a spring.

Move iron core 6 and be equipped with and supply 8 one end male mounting grooves 61 of ejector pin, be equipped with the annular step 72 that sets up around ejector pin 8 in quiet iron core 7, the one end of ejector pin 8 in the mounting groove is equipped with annular boss 81, elastic component 9 suit is on ejector pin 8 and both ends conflict annular step and annular boss respectively, move the mounting groove of iron core and can supply the ejector pin to insert the installation, the size of mounting groove is greater than annular boss and elastic component, can prevent that elastic component and ejector pin from breaking away from, provides stability, the setting up of annular step makes quiet iron core form a counter bore, and the effect that elastic component played in the counter bore is the same with the mounting groove.

The static contact 5 is fixedly installed in the shell 1, and the static contact 5 is provided with an installation hole 51 for installing one end of the static iron core 7; the static iron core is fixed on the shell through a static contact.

Still include yoke 2, yoke 2 installs in shell 1, yoke 2 is the U type, and the second through-hole 21 that supplies quiet iron core 7 to pass is established to the lateral wall of its one side, and the lateral wall of its opposite side is equipped with dodges and moves the hole 22 of dodging of iron core 6 and quiet iron core 7, and in the installation, will be quiet iron core earlier, move iron core, elastic component and ejector pin installation, then install this whole dodging hole department from the yoke, until quiet iron core passes the second through-hole, then install yoke and iron core assembly together on the casing.

The movable iron core 6 is columnar, the part of the movable iron core located in the installation position 11 is narrowed, in order to achieve the effect of reducing the size as much as possible, the shell is provided with rivets in the oblique angle direction of the installation position, in order to avoid contact with the rivets, the part of the movable iron core needs to be narrowed, and the electric leakage caused by too close distance with the rivets is prevented.

The ejector rod is made of aluminum alloy or copper alloy, and has the advantage of good strength.

The static iron core of this embodiment is fixed on the shell through the static contact, in order to better increase the suction between moving iron core and the static iron core in the electromagnetic system, increases U type yoke, with yoke and static contact riveting together, when the coil passes through heavy current, if do not have the yoke, the magnetic field that produces in the coil mostly passes through the moving iron core and the static iron core in the middle of the coil, but some magnetic field can't pass through moving iron core and static iron core. After the magnetic yoke is added, most of the magnetic field generated in the coil passes through the movable iron core and the fixed iron core in the middle of the coil, and the attraction force of the movable iron core and the fixed iron core is increased. Therefore, the force of the elastic piece can be increased under the condition of breaking the same line fault current, the external interference is reduced, the plunger can be more reliably pushed by the movable iron core when the line has a fault, the mechanism is unlocked, and the line is broken.

When a circuit is in short circuit fault, large current passes through the coil, a large magnetic field is generated by the large current, the magnetic field generates suction between the movable iron core and the static iron core, the movable iron core drives the ejector rod which abuts against the movable iron core, the elastic piece overcomes the reactive force of the elastic piece and moves towards the direction of the static iron core, when the ejector rod moves towards the right, the lock catch is pushed to rotate, the buckle surface of the jump buckle is separated from the groove surface of the lock catch, the mechanism is unlocked, the product is separated from the brake, the movable contact and the static contact are separated, no current passes through the coil, and the movable iron core moves back under the reactive force of the elastic piece and abuts against the shell.

In the moving process of the moving iron core, the narrowed end of the moving iron core is always positioned in the mounting position of the shell, and the other end of the moving iron core leans against the ejector rod and the elastic piece, so that the moving iron core is always kept balanced in the moving process, the moving iron core cannot shake, the interference to the moving process of the moving iron core is reduced, and the suction force between the moving iron core and the static iron core is kept stable.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the present invention has been described in terms of the above embodiments, the inventive concept is not limited to the above embodiments, and any modifications using the inventive concept are intended to be included within the scope of the appended claims.

Claims (6)

1. The utility model provides an electromagnetic mechanism of circuit breaker, its includes shell (1), coil pack and iron core assembly, coil pack include coil (4) and static contact (5), the iron core assembly including moving iron core (6), quiet iron core (7) and ejector pin (8), its characterized in that: be equipped with on shell (1) and supply to move installation position (11) that iron core (6) slided the installation, be equipped with between ejector pin (8) and quiet iron core (7) and contradict elastic component (9) of the two, the one end that quiet iron core (7) were kept away from in ejector pin (8) utilize the pretightning force of elastic component (9) with move iron core (6) contact cooperation, quiet iron core (7) are equipped with and supply ejector pin (8) to run through first through-hole (71), coil (4) encircle and contactless setting be in move the outer circumference of iron core (6) and quiet iron core (7).

2. The electromagnetic mechanism of a circuit breaker of claim 1, wherein: move iron core (6) and be equipped with and supply ejector pin (8) one end male mounting groove (61), be equipped with in quiet iron core (7) around annular step (72) that ejector pin (8) set up, ejector pin (8) one end in the mounting groove is equipped with annular boss (81), elastic component (9) suit is on ejector pin (8) and both ends conflict annular step and annular boss respectively.

3. The electromagnetic mechanism of a circuit breaker of claim 1, wherein: the static contact (5) is fixedly installed in the shell (1), the static contact (5) is provided with an installation hole (51) for installing one end of a static iron core (7), and the static iron core is fixedly connected with the static contact.

4. The electromagnetic mechanism of a circuit breaker of claim 1, wherein: still include yoke (2), yoke (2) are the U type and install in shell (1), and second through-hole (21) that supply quiet iron core (7) to pass are established to the lateral wall of its one side, and the lateral wall of its opposite side is equipped with dodges and dodges hole (22) of dodging movable iron core (6) and quiet iron core (7).

5. The electromagnetic mechanism of a circuit breaker of claim 1, wherein: the movable iron core (6) is columnar, and the part of the movable iron core positioned in the mounting position (11) is narrowed.

6. The electromagnetic mechanism of a circuit breaker of claim 1, wherein: the ejector rod is made of aluminum alloy or copper alloy.

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