WO2016074321A1

WO2016074321A1 - Breaker operation mechanism

Info

Publication number: WO2016074321A1
Application number: PCT/CN2014/094922
Authority: WO
Inventors: 黄燮云
Original assignee: 杭州泰姆电气有限公司
Priority date: 2014-11-13
Filing date: 2014-12-25
Publication date: 2016-05-19
Also published as: CN104319203B; CN104319203A

Abstract

A breaker operation mechanism comprises a handle (2) and a moving contact (11), and further comprises a lock catch (6), a moving contact bracket (5) and a handle push rod(3), wherein a lock catch groove is formed in one end of the lock catch (6); one end of the moving contact bracket (5) is fixedly connected with the moving contact (11); the other end of the moving contact bracket (5) is provided with a bracket groove; one end of the handle push rod (3) is connected with the handle (2); the other end of the handle push rod (3) is arranged in the lock catch groove and the bracket groove; the handle push rod (3) can drive the lock catch (6) and the moving contact bracket (5) to rotate when sliding in the lock catch groove and the bracket groove; the width of a notch formed by the lock catch groove and the bracket groove is smaller than the width of the handle push rod (3) when the breaker is connected. In the disconnection or connection process of the breaker operation mechanism, the handle push rod is in line contact with the lock catch and the moving contact bracket, friction force is small, and therefore the service life of the breaker is prolonged, and the reliability of the disconnection process of the breaker is improved.

Description

Circuit breaker operating mechanism

The present application claims priority to Chinese Patent Application No. 201410641431.6, filed on Jan. 13, 2014, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to the field of circuit breaker technology, and more particularly to a circuit breaker operating mechanism.

Background technique

A circuit breaker is a switching device that can close, carry and break current under normal circuit conditions and can close and carry current under the abnormal loop conditions within a specified time. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, protect power lines and motors, and cut off circuits when they are severely overloaded or short-circuited or under-voltage faults. Their functions are equivalent to fuse switches and A combination of under-heat relays, etc. Moreover, it is generally not necessary to change parts after breaking the fault current.

The breaking of the circuit breaker is achieved by manipulating the action of the structure. At present, common circuit breaker operating mechanisms are mostly composed of handles, locks, jumpers, moving contacts and other components. Usually, the buckle is directly interlocked with the jump buckle. When the buckle is buckled and the jumper is in surface contact, the friction is large, and when the operating mechanism is operated, the friction occurs mostly at the metal-metal contact surface or the plastic and The contact surface of the plastic thus also causes a large friction. Due to friction and wear, ordinary circuit breakers can only be used 4,000 times, and a few long-life circuit breakers can only reach 10,000 times.

In addition, the existing circuit breaker operating mechanism includes various components in addition to the moving contact and the handle, and thus has a problem of complicated structure and low reliability.

In summary, how to effectively solve the problem that the friction between the components of the operating mechanism of the circuit breaker tripping process is large, so that the circuit breaker has a short service life and poor reliability is an urgent problem to be solved by those skilled in the art. .

Summary of the invention

In view of the above, an object of the present invention is to provide a circuit breaker operating mechanism, the circuit breaker operating machine The structure can effectively solve the problem that the friction between the components of the operating mechanism of the circuit breaker tripping process is large, thereby making the circuit breaker have a short service life and poor reliability.

In order to achieve the above object, the present invention provides the following technical solutions:

A circuit breaker operating mechanism, comprising a handle and a movable contact, further comprising:

a latch with a locking groove at one end;

a movable contact bracket fixedly connected to the movable contact at one end, and a bracket recess is formed at the other end of the movable contact bracket;

a handle push rod, one end of the handle push rod is connected to the handle, and the other end is placed in the lock groove and the bracket groove, and the handle push rod slides in the lock groove and the bracket groove The lock and the movable contact bracket can be rotated, and the notch groove and the bracket groove form a notch width smaller than a width of the handle push rod when the circuit breaker is closed.

Preferably, the circuit breaker operating mechanism further includes a pull rod connected to the buckle at one end, and the other end of the pull rod is opposite to the bimetal of the circuit breaker.

Preferably, in the above-mentioned circuit breaker operating mechanism, the buckle is connected to the movable contact bracket through a pin shaft.

Preferably, in the above-mentioned circuit breaker operating mechanism, one side of the latching notch is provided with a boss.

Preferably, in the above-mentioned circuit breaker operating mechanism, the handle push rod has a circular cross section.

Preferably, in the circuit breaker operating mechanism, one end of the movable contact is provided with a circular hole, and the movable contact bracket is provided with a boss that cooperates with the circular hole, and passes through the contact spring and the movable contact Fixed connection.

Preferably, in the above-mentioned circuit breaker operating mechanism, the inner wall of the notch of the locking groove is provided with a protrusion to block the handle push rod.

Preferably, the circuit breaker operating mechanism further includes a lock return spring, and the lock buckle is provided with a lock cavity, and the lock return spring is disposed in the lock cavity, and the circuit breaker is closed. The lock return spring is deformed to generate a force that causes the lock to rotate in the direction in which the breaker is disconnected.

Preferably, the circuit breaker operating mechanism further includes a bracket return spring, and the movable contact bracket is provided with a bracket cavity, the bracket return spring is disposed in the bracket cavity, and the bracket is closed when the circuit breaker is closed The return spring is deformed to generate a rotation of the movable contact bracket toward the disconnection position of the circuit breaker Force.

Preferably, in the circuit breaker operating mechanism, the handle push rod is a metal rod, and the lock and the movable contact bracket are plastic parts.

The circuit breaker operating mechanism provided by the invention comprises a handle, a movable contact, a lock, a movable contact bracket and a handle push rod. Wherein, one end of the handle push rod is connected with the handle, and the other end is placed in the lock groove of the lock buckle and the bracket groove of the movable contact bracket, and the handle push rod drives the lock and the movable contact when sliding in the groove The bracket rotates, and the width of the notch formed by the locking groove and the bracket groove is reduced to be smaller than the width of the handle push rod when the circuit breaker is closed, and the movable contact is connected to the movable contact bracket, and the follower contact bracket Rotate together.

When the circuit breaker operating mechanism provided by the invention is used to switch the circuit breaker from the off state to the closed state, the handle push rod is placed in the lock groove of the lock and the bracket groove of the movable contact bracket under the action of external force. One end of the groove slides in the groove and abuts against the inner wall of the groove, thereby pushing the lock and the movable contact bracket to rotate until the movable contact connected with the movable contact bracket contacts the static contact, and the circuit is turned on, and At this time, the width of the notch formed by the locking groove and the bracket groove is smaller than the width of the handle push rod. When the circuit breaker is switched from the closed state to the open state, the movable contact is separated from the static contact, and the lock and the movable contact bracket rotate. During the above-mentioned opening or closing, during the rotation of the lock and the movable contact bracket, friction occurs between the handle push rod and the lock and the movable contact bracket, and between the handle push rod and the lock and the movable contact bracket All are in line contact, and the friction is small, which prolongs the service life. In general, the circuit breaker using the circuit breaker operating mechanism provided by the present invention can be used 20,000 times, which is a significant improvement compared with the conventional circuit breaker.

At the same time, the circuit breaker operating mechanism provided by the present invention includes only two components of the lock and the movable contact bracket except for the movable contact and the handle, and the entire operating mechanism has fewer components, simple structure, and improved reliability.

In a preferred embodiment, the circuit breaker operating mechanism provided by the present invention further includes a pull rod connected at one end to the buckle, and the other end of the pull rod is abutted against the bimetal of the circuit breaker. The bimetal will bend after being heated, and finally the lock and the movable contact bracket will be rotated to allow the circuit breaker to trip to achieve overload protection.

In another preferred embodiment, the circuit breaker operating mechanism of the present invention has a boss on one side of the latching notch. On the one hand, during the rotation of the handle push rod to drive the lock, the push rod abuts against the side wall of the boss to rotate it; on the other hand, the arrangement of the boss ensures the free trip function of the operating mechanism Now, at the same time, it is ensured that the handle push rod smoothly slides into the bracket groove of the contact bracket in the locking groove, that is, the operating mechanism can be quickly operated, and the strength of the locking groove is also improved.

In another preferred embodiment, the circuit breaker operating mechanism provided by the present invention has a handle push rod which is a metal piece, and the lock and the movable contact bracket are mostly plastic parts, and the friction between the metal and the plastic is also smaller than that of the metal and the metal. The friction between the plastic and the plastic, thereby reducing the wear and tear of the components during the breaking process of the circuit breaker and the service life of the extender.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic exploded view of a circuit breaker operating mechanism according to an embodiment of the present invention;

2 is a schematic view showing the assembly of a circuit breaker operating mechanism according to an embodiment of the present invention;

3 is a schematic view showing the overall assembly of a circuit breaker in an open state of a circuit breaker operating mechanism according to an embodiment of the present invention;

4 is a schematic view showing the overall assembly of a circuit breaker in a closed state of a circuit breaker operating mechanism according to an embodiment of the present invention.

The figures are marked as follows:

Base 1, handle 2, handle push rod 3, handle spring 4, moving contact bracket 5, lock 6, bracket return spring 7, pin 8, lock return spring 9, contact spring 10, moving contact 11 , the pull rod 12, the static contact 13, the bimetal 14, the locking boss 15.

detailed description

The embodiment of the invention discloses a circuit breaker operating mechanism to reduce the friction between the components of the operating mechanism of the tripping process, thereby prolonging the service life of the circuit breaker and improving the reliability of the breaking process.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, instead of All embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 to FIG. 4, FIG. 1 is a schematic exploded view of a circuit breaker operating mechanism according to an embodiment of the present invention; FIG. 2 is a schematic diagram of assembly of a circuit breaker operating mechanism according to an embodiment of the present invention; The schematic diagram of the overall assembly of the circuit breaker in the open state of the circuit breaker operating mechanism; FIG. 4 is a schematic view of the overall assembly of the circuit breaker in the closed state of the operating mechanism of the circuit breaker according to the embodiment of the present invention.

The circuit breaker operating mechanism provided by the invention comprises a handle 2, a handle push rod 3, a movable contact 11, a movable contact bracket 5 and a lock 6.

The handle 2 is fixedly mounted in the circuit breaker base 1 and can be fixed by a handle spring 4, and the handle 2 can be rotated to a certain extent along the axis. The shape structure and the specific fixing manner of the handle 2 are referred to the prior art, and are not described herein again.

One end of the handle push rod 3 is connected to the handle 2. Specifically, the handle 2 can be provided with a hole, and one end of the handle push rod 3 is inserted into the hole. When the handle 2 is rotated, the handle push rod 3 is moved. Of course, the handle push rod 3 and the handle 2 can also be connected by other conventional connections, such as hinges. The handle push rod 3 is usually a U-shaped rod, and of course other shapes can be used as long as it enables the transmission between the handle 2 and the lock 6 and the movable contact holder 5.

One end of the locking buckle 6 is provided with a locking groove, and one end of the movable contact bracket 5 is provided with a bracket groove, and the locking groove is matched with the bracket groove. The other end of the handle push rod 3 is placed in the lock groove and the bracket groove. The handle push rod 3 slides in the lock groove and the bracket groove with the rotation of the handle, and can be offset with the lock groove and the inner wall of the bracket groove when sliding to a certain extent, and further, with the further rotation of the handle 2, The handle push rod 3 pushes the lock 6 and the movable contact holder 5 to rotate, so that the movable contact 11 is in contact with the fixed contact 13. When the circuit breaker is in the closed state, the notch groove and the bracket groove form a notch width that is smaller than the width of the handle push rod 3 to resist the handle push rod 3, thereby keeping the circuit breaker in a closed state.

The movable contact 11 is connected to the movable contact holder 5, and can be rotated together with the movable contact holder 5 so as to be in contact with or separated from the fixed contact 13 to turn on or off the circuit to achieve the purpose of breaking.

Specifically, when the circuit breaker is switched from the disconnected state to the closed state, the handle push rod 3 slides under the action of the external force, and the handle push rod 3 further drives the lock 6 and the movable contact bracket 5 to rotate until the movable contact bracket 5 The connected moving contact 11 is in contact with the fixed contact 13 to turn on the circuit. Due to the lock 6 during the rotation The rotation amplitude of the movable contact bracket 5 is different, and thus the notch formed by the locking groove and the bracket groove is gradually reduced with the rotation of the two, and when the movable contact 11 is rotated to the closed position, the width of the notch is smaller than The width of the handle push rod 3, thereby holding the handle push rod 3 in the groove formed by the two, keeps the circuit breaker in a closed state.

When the circuit breaker is tripped, that is, from the closed state to the disconnected state, the latch 6 is first disengaged, and the locking groove and the bracket groove are released from the limit of the handle push rod 3, and the latch 6 and the movable contact The head holder 5 is rotated, and the movable contact 11 is separated from the fixed contact 13.

In order to further optimize the above technical solution, the circuit breaker operating mechanism provided by the present invention further includes a tie rod 12. One end of the tie rod 12 is connected to the striker 6, and the other end is abutted against the bimetal 14 of the circuit breaker. The tie rod 12 may be U-shaped or may have a shape such as an L-shape that can withstand the bimetal. Therefore, when an overload occurs, the bimetal 14 is thermally deformed, the pull rod 12 is actuated, and the pull rod 12 is connected with the buckle 6 to drive the lock 6 to act, and tripping occurs to realize overload protection.

In order to facilitate the installation and the breaking operation, the movable contact holder 5 and the lock 6 are connected by the pin 8. When the handle push rod 3 rotates with the handle, the movable contact bracket 5 and the lock 6 are rotated around the pin shaft 8. Of course, the two can also adopt other positioning methods, such as forming a groove on the base 1, rotating the movable contact bracket 5 and the latch 6 along the groove, etc., so that only the rotating movable contact 11 with the two can be The static contacts 13 are in contact to realize the closing of the circuit breaker.

Further, a boss may be disposed on one side of the latching notch. On the one hand, during the rotation of the handle push rod to drive the lock, the push rod abuts against the side wall of the boss to rotate it; on the other hand, the setting of the boss ensures the realization of the free trip function of the operating mechanism, and at the same time ensures the handle The push rod smoothly slides into the bracket groove of the contact bracket in the locking groove, which ensures that the operating mechanism can move quickly and the strength of the locking groove is also improved.

In order to close the circuit breaker, the locking groove and the bracket groove can better block the handle push rod 3 in the groove to keep the circuit breaker normally closed, and the inner side of the locking groove can be further convex. Start. When the circuit breaker is in the closed state, the notch formed by the protrusion and the bracket groove is smaller than the width of the handle push rod 3, and thus the handle push rod 3 is just locked in the groove. The shape and position of the protrusion depend on the position of the handle push rod 3. Of course, the protrusion can also be disposed on the inner side of the bracket groove, and the handle push rod 3 can also be blocked.

In a specific embodiment of the present invention, the handle push rod 3 has a circular cross section, so that the friction between the handle push rod 3 and the lock 6 and the movable contact bracket 5 is small, and the handle is relatively labor-saving. Easy to operate. The cross section of the handle push rod 3 can also be set to an ellipse or other shape, and only needs to be brought into line contact when the lock 6 and the movable contact holder 5 are rotated. The specific handle push rod 3 may be a metal rod, and the corresponding lock 6 and the movable contact holder 5 may be plastic parts. Since the friction between the metal and plastic contact surface is less than the friction between the metal and the metal or between the plastic and the plastic, the friction between the components of the operating mechanism of the breaking process is further reduced, and the service life is prolonged.

The movable contact 11 of the present invention is connected to the movable contact holder 5, and specifically, a circular hole can be formed at one end of the movable contact 11, and the movable contact holder 5 is provided with a boss corresponding to the circular hole, and the movable contact 11 The movable contact holder 5 is fixedly connected by the contact spring 10. The contact spring 10 is arranged to provide contact pressure for the movable contact 11. After the circuit breaker is closed, if the static contact 13 is removed, the movable contact 11 can continue to rotate forward to realize overtravel. Moreover, compared with other mechanisms for realizing the overtravel, the structure of connecting the movable contact 11 and the movable contact holder 5 through the contact spring 10 is simpler, and is convenient for manufacturing and installation. Of course, the movable contact 11 can also be connected to the movable contact holder 5 by means of hinge or other conventional manner, so that it can rotate according to the rotation of the movable contact holder 5.

In order to make the circuit breaker tripping process more reliable and labor-saving, the present invention further includes a bracket return spring 7. In order to facilitate the installation of the bracket return spring 7, a bracket cavity is further formed on the movable contact bracket 5 for placing the bracket return spring 7. When the circuit breaker is closed, the bracket return spring 7 is deformed, and a force is generated to rotate the movable contact bracket 5 in the direction in which the breaker is disconnected. Specifically, a bracket spring groove can be formed on the movable contact bracket 5, and the base of the circuit breaker 1 is provided with a base spring boss. One end of the bracket return spring 7 abuts in the bracket spring groove, and the other end abuts Base spring boss. When the circuit breaker is in the closed state, the bracket return spring 7 is deformed to generate a force that causes the movable contact holder 5 to rotate in the disconnection direction of the circuit breaker. Of course, the bracket return spring 7 can also be installed by other methods in the prior art, and the specific form is not limited in the present invention.

Also, further, the present invention also includes a lock return spring 9. In order to facilitate the installation of the lock return spring 9, the lock ring 6 further defines a lock cavity for placing the lock return spring 9. When the circuit breaker is closed, the lock return spring 9 is deformed to generate the lock 6 to the circuit breaker. Disengage the force in the direction of the position. Specifically, a bracket spring boss can be disposed on the movable contact bracket 5, and one end of the lock return spring 9 abuts against the bracket spring boss, and the other end abuts against the inner wall of the latch cavity. When the circuit breaker is in the closed state, the lock The buckle return spring 9 is deformed to generate a force that causes the striker 6 to rotate in the disconnection direction of the circuit breaker. Of course, the lock return spring 9 can also be installed by other means in the prior art, and the specific form thereof is not limited in the present invention.

The function of the bracket return spring 7 and the lock return spring 9 is mainly to provide a certain power for the tripping process of the circuit breaker. Of course, it is also possible to use other elastic members or other means for causing the lock 6 or the movable contact holder 5 to rotate in the opening direction when the circuit breaker is closed, and it is not limited to the return spring. When the circuit breaker is closed, due to the notch formed by the locking groove and the groove of the bracket, the width thereof is smaller than the width of the handle push rod 3, and the bracket return spring 7 and the lock return spring 9 act on the movable contact bracket 5 and The force of the buckle 6 to rotate in the disconnection direction of the circuit breaker is not enough to rotate the two, so that the lock groove and the bracket groove block the handle push rod 3 in the groove to keep the circuit breaker closed. status. When an overload or an overcurrent occurs, the lock 6 is disengaged, and the locking groove and the bracket groove are released from the limit of the handle push rod 3, and then the buckle is actuated by the bracket return spring 7 and the lock return spring 9. 6 and the movable contact holder 5 rotates until the movable contact holder 5 and the lock 6 are restored to the position where the circuit breaker is disconnected.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

A circuit breaker operating mechanism includes a handle (2) and a movable contact (11), and further comprising:

a latch (6) with a locking groove at one end;

a movable contact bracket (5) fixedly connected to the movable contact (11) at one end, and a bracket recess is formed at the other end of the movable contact bracket (5);

a handle push rod (3), one end of the handle push rod (3) is connected to the handle (2), and the other end is placed in the lock groove and the bracket groove, the handle push rod ( 3) driving the lock (6) and the movable contact bracket (5) to rotate when the lock groove and the bracket groove slide, and the lock is concave when the circuit breaker is closed The slot and the bracket recess define a slot width that is less than the width of the handle pusher (3).
The circuit breaker operating mechanism according to claim 1, further comprising a pull rod (12) connected to the lock (6) at one end, the other end of the pull rod (12) and the bimetal of the circuit breaker The film (14) is offset.
The circuit breaker operating mechanism according to claim 1, characterized in that the lock (6) and the movable contact bracket (5) are connected by a pin (8).
The circuit breaker operating mechanism according to any one of claims 1 to 3, characterized in that one side of the latching notch is provided with a latching boss (15).
The circuit breaker operating mechanism according to claim 1, characterized in that the handle push rod (3) has a circular cross section.
The circuit breaker operating mechanism according to claim 1, wherein one end of the movable contact (11) is provided with a circular hole, and the movable contact holder (5) is provided with a matching hole. The boss is fixedly connected to the movable contact (11) by a contact spring (10).
The circuit breaker operating mechanism according to claim 1, wherein the inner wall of the notch of the locking groove is provided with a protrusion to block the handle push rod (3).
The circuit breaker operating mechanism according to claim 1, further comprising a lock return spring (9), and the lock (6) is provided with a lock cavity, the lock return spring (9) Placed in the lock cavity, the lock return spring (9) is deformed when the circuit breaker is closed, and generates a force that causes the lock (6) to rotate toward the disconnection position of the circuit breaker.
The circuit breaker operating mechanism according to claim 1, further comprising a bracket return spring (7), wherein the movable contact bracket (5) is provided with a bracket cavity, and the bracket return spring (7) is disposed In the bracket cavity, the bracket return spring (7) is deformed when the circuit breaker is closed, and a force is generated to rotate the movable contact bracket (5) in the direction in which the breaker is disconnected.
The circuit breaker operating mechanism according to claim 1, wherein the handle push rod (3) is a metal rod, and the lock (6) and the movable contact bracket (5) are plastic parts.