CN110120321B

CN110120321B - Closed low-voltage circuit breaker

Info

Publication number: CN110120321B
Application number: CN201810118435.4A
Authority: CN
Inventors: 章瀛; 陈莺莺
Original assignee: Zhejiang Shengxi Electric Co ltd
Current assignee: Zhejiang Shengxi Electric Co ltd
Priority date: 2018-02-06
Filing date: 2018-02-06
Publication date: 2020-11-24
Anticipated expiration: 2038-02-06
Also published as: CN110120321A

Abstract

The invention discloses an enclosed low-voltage circuit breaker, which comprises an insulating shell, wherein a push rod, a reset device, a driving device and a vacuum arc extinguisher are arranged in the insulating shell, the driving device is used for driving the push rod to move up and down, the driving device comprises a cylinder body which is integrally formed with the insulating shell, a permanent magnet arranged in the cylinder body and a coil which is arranged on the outer wall of the cylinder body and used for driving the permanent magnet to move, the driving device is connected with the push rod through a transmission mechanism, the transmission mechanism comprises a cross rod, a gear set and a rack, the cross rod is connected with the permanent magnet and meshed with the gear set, the rack is meshed with the gear set and connected with the push rod through a connecting rod, an upper bus and a lower bus which are respectively connected with a moving contact and a static. The invention has the beneficial effects that: through the mode of electromagnetic drive, realized low-voltage circuit breaker inner structure and external complete separation, ensured low-voltage circuit breaker's under the adverse circumstances safety in utilization effectively.

Description

Closed low-voltage circuit breaker

Technical Field

The application belongs to the technical field of electrical equipment, and particularly relates to a closed low-voltage circuit breaker.

Background

The low-voltage circuit breaker is used as a low-voltage electrical appliance and has the functions of overload, short circuit and undervoltage protection, in daily application, a universal air type circuit breaker is generally adopted to control a distribution line and protect equipment at present, the contact part of the circuit breaker is exposed, in the opening and closing process, a contact can generate electric sparks, when inflammable and explosive gas or dust exists in the air, once the electric sparks contact the electric sparks, explosion danger can occur, therefore, the low-voltage circuit breaker with a vacuum arc extinguish chamber is generally adopted in a complex environment, but the vacuum arc extinguish device has strong mechanical properties, and under the condition of long-term use or severe use environment, the phenomena of aging air leakage, arc extinguish function loss and the like can occur, so that the sparks can still contact with the outside, and certain potential safety hazards are caused.

Disclosure of Invention

In view of this, the present application provides a closed low-voltage circuit breaker, which effectively solves the potential safety hazard caused by aging of a vacuum arc extinguisher through a dual isolation manner. In order to solve the technical problem, the application discloses an airtight type low-voltage circuit breaker, including the insulating casing, be equipped with push rod and vacuum arc extinguisher in the insulating casing, still be equipped with the drive arrangement who is used for driving the push rod to reciprocate in the insulating casing, drive arrangement includes cylinder body, permanent magnet and coil, the permanent magnet is located inside the cylinder body, the outer wall of cylinder body is equipped with the coil that is used for driving the permanent magnet removal, cylinder body and insulating casing integrated into one piece, drive arrangement is connected with the push rod through a drive mechanism, drive mechanism includes horizontal pole, gear train and rack, the one end of horizontal pole is connected with the permanent magnet and is equipped with the profile of tooth with gear train assorted, the gear train meshes with the profile of tooth on the horizontal pole mutually, be equipped with on the inner wall of insulating casing with horizontal pole looks vertically spout, the rack is located in the spout, one end of the rack is connected with the push rod through a connecting rod, an upper bus and a lower bus are arranged on the insulating shell, the upper bus is connected with a moving contact of the vacuum arc extinguisher, the lower bus is connected with a static contact of the vacuum arc extinguisher, and sealant is arranged on contact surfaces of the upper bus, the lower bus and the insulating shell.

More preferably: still be equipped with the reset spring that is used for the permanent magnet to reset in the cylinder body, the upper edge of cylinder body is equipped with the backstop board, the permanent magnet passes through reset spring and is connected with the backstop board. By additionally arranging the return spring in the cylinder body, the permanent magnet can be pushed to return to the initial position when the coil is powered off, and the control mode of the circuit breaker is simplified.

More preferably: one end of the push rod is provided with a guide post, a groove matched with the guide post is formed in the insulating shell, the guide post is arranged in the groove, the other end of the push rod is provided with an insulating pad, and the insulating pad is connected with a moving contact of the arc extinguisher. Through the setting of guide post, can control the direction of push rod motion more accurately, and consider the life of push rod, the push rod is generally made by the metal, and it is in order to carry out the electrical isolation with push rod and arc extinguisher better to increase the insulating pad.

More preferably: the vacuum arc extinguisher is characterized in that a limiting sleeve is further arranged in the insulating shell, the push rod is arranged in the limiting sleeve, and the upper bus is electrically connected with a moving contact of the vacuum arc extinguisher through a flexible connection.

More preferably: the bottom of the cylinder body is also provided with a buffer cushion which is arc-shaped and is glued with the cylinder body. This is in order to prevent because the spring draws when the reset spring resets and leads to permanent magnet and cylinder inner wall touching and lead to the permanent magnet to damage.

More preferably: the gear set comprises a driving wheel, a driven wheel and a driving wheel, the radius of the driving wheel is far larger than that of the driven wheel, and the driving wheel is coaxially connected with the driven wheel. Through the connection mode, the stroke of the rack can be increased, and the occupancy rate of the driving device in the insulating shell can be reduced.

More preferably: and a dust cover is also arranged outside the cylinder body and detachably connected with the insulating shell. The dustproof function to the cylinder body is achieved, and the service life of the cylinder body is prolonged.

Compared with the prior art, the application can obtain the following technical effects:

1) the vacuum arc extinguisher not only isolates the electric arc from the external connection, but also isolates the original unhooking protection mechanism from the external connection, thereby improving the whole tightness of the circuit breaker;

2) through electromagnetic drive's mode, simplified control flow, accomplished that inside mechanism keeps apart with external complete, further promotes the leakproofness.

Of course, it is not necessary for any product to achieve all of the above-described technical effects simultaneously.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic view of the general structure of an embodiment of the closed type low voltage circuit breaker of the present application;

fig. 2 is a schematic structural diagram of a driving device when the circuit breaker of the embodiment of the closed type low-voltage circuit breaker of the application is switched on;

FIG. 3 is a schematic structural diagram of a driving device for opening the circuit breaker according to the embodiment of the closed low-voltage circuit breaker of the present application;

fig. 4 is a schematic structural view of a push rod of the closed low-voltage circuit breaker of the present application;

fig. 5 is a schematic structural view of a gear set according to an embodiment of the closed low-voltage circuit breaker of the present application.

The notation in the figure is: 1. the vacuum arc extinguisher comprises an insulating shell, 2, a push rod, 3, a vacuum arc extinguisher, 4, an upper bus, 5, a lower bus, 6, a cylinder, 7, a transmission mechanism, 8, a dust cover, 21, a guide post, 22, a groove, 23, an insulating pad, 24, a limiting sleeve, 61, a permanent magnet, 62, a coil, 63, a return spring, 64, a stop plate, 65, a cushion pad, 71, a cross rod, 72, a gear set, 73, a rack, 74, a sliding groove, 75, a connecting rod, 721, a driving wheel, 722, a driven wheel, 723 and a driving wheel.

Detailed Description

Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

As shown in fig. 1 to 3: the closed low-voltage circuit breaker comprises an insulating shell 1, a push rod 2 and a vacuum arc extinguisher 3, wherein the push rod 2 is connected with the vacuum arc extinguisher 3 and is used for controlling the contact and separation of a static contact and a moving contact of the vacuum arc extinguisher; a driving device for driving the push rod 2 to move up and down is further arranged in the insulating shell 1, the driving device comprises a cylinder body 6, a permanent magnet 61 and a coil 62, the permanent magnet 61 is arranged in the cylinder body 6, lubricating oil is coated on the contact surface of the permanent magnet 61 and the inner wall of the cylinder body 6, the coil 62 for driving the permanent magnet 61 to move is arranged on the outer wall of the cylinder body 6, the polarity of a magnetic field generated when the coil 62 is electrified is the same as that of the magnet, the permanent magnet is driven to move in the cylinder body 6, and in order to achieve the integral sealing performance, the cylinder body 6 and the insulating shell; the driving device is connected with the push rod 2 through a transmission mechanism 7, the transmission mechanism 7 comprises a cross rod 71, a gear set 72 and a rack 73, one end of the cross rod 71 is connected with the permanent magnet 61 and is provided with a tooth form matched with the gear set 72, in order to improve the connection strength of the cross rod 71 and the permanent magnet 61, a permanent magnet with a through hole in the middle can be selected, then one end of the cross rod 71 is polished and inserted into the through hole, and then is glued by glue, the gear set 72 is meshed with the tooth form on the cross rod 71, a sliding groove 74 vertical to the cross rod 71 is arranged on the inner wall of the insulating shell 1, the rack 73 is arranged in the sliding groove 74 and is meshed with the gear set 72, one end of the rack 73 is connected with the push rod 2 through a connecting rod 75, and when; an upper bus 4 and a lower bus 5 are arranged on the insulating shell 1, the upper bus 4 is connected with a moving contact of the vacuum arc extinguisher 3, the lower bus 5 is connected with a static contact of the vacuum arc extinguisher 3, the upper bus 4 and the lower bus 5 are fixed on the insulating shell 1 through miniature bolts, and sealant is arranged on contact surfaces of the upper bus 4 and the lower bus 5 and the insulating shell 1.

Due to the adoption of electromagnetic driving, in the process of switching on and switching off, currents in opposite directions need to be conducted in the coil 62, the control difficulty is increased, in order to simplify the operation process, a return spring 63 for resetting the permanent magnet 61 is further arranged in the cylinder 6, a stop plate 64 is arranged on the upper edge of the cylinder 6, the stop plate 64 is fixed on the insulating shell 1 through a micro bolt, and the permanent magnet 61 is connected with the stop plate 64 through the return spring 63.

Be equipped with guide post 21 in push rod 2 one end, be equipped with in the insulating casing 1 with guide post 21 assorted recess 22, guide post 21 is located in the recess 22, play the effect of direction in the push rod 2 removes, in addition, for the life of extension push rod 2, push rod 2 is made by the metal, the other end of push rod 2 is equipped with insulating pad 23, insulating pad 23 is connected with the moving contact of arc extinguisher 3, play the insulating action between push rod 2 and the arc extinguisher 3, still be equipped with stop collar 24 in the insulating casing 1, push rod 2 is located in the stop collar 24, go up generating line 4 and be connected with the moving contact electricity of vacuum arc extinguisher 3 through a flexible coupling 41.

At the in-process of separating brake, reset spring 63 can give a restoring force of permanent magnet 61, and at the in-process of replying, probably reset spring 63 can produce an elongated deformation, lead to permanent magnet 61 to collide with the bottom of cylinder body 6 and damage, so still be equipped with blotter 65 in the bottom of cylinder body 6, blotter 65 is arc arch and splices with cylinder body 6, can play good cushioning effect to permanent magnet 61, still be equipped with dust cover 8 outside cylinder body 6, dust cover 8 with insulating casing 1 detachably connects, and is preferred, can set up the recess on insulating casing 1, sets up the buckle on the dust cover 8, dust cover 8 and insulating casing 1 lock joint.

The invention has the beneficial effects that: through the mode of electromagnetic drive, realized low-voltage circuit breaker inner structure and external complete separation, ensured low-voltage circuit breaker's under the adverse circumstances safety in utilization effectively.

The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a closed low-voltage circuit breaker, includes insulating casing (1), be equipped with push rod (2) and vacuum arc extinguisher (3) in insulating casing (1), its characterized in that: still be equipped with the drive arrangement who is used for driving push rod (2) to reciprocate in insulating casing (1), drive arrangement includes cylinder body (6), permanent magnet (61) and coil (62), inside cylinder body (6) was located in permanent magnet (61), the outer wall of cylinder body (6) is equipped with coil (62) that are used for driving permanent magnet (61) to remove, cylinder body (6) and insulating casing (1) integrated into one piece, drive arrangement is connected with push rod (2) through a drive mechanism (7), drive mechanism (7) include horizontal pole (71), gear train (72) and rack (73), the one end and permanent magnet (61) of horizontal pole (71) are connected and are equipped with the profile of tooth that matches with gear train (72), gear train (72) mesh with the profile of tooth on horizontal pole (71), be equipped with spout (74) mutually perpendicular with horizontal pole (71) on the inner wall of insulating casing (1), the rack (73) is arranged in the sliding groove (74) and meshed with the gear set (72), one end of the rack (73) is connected with the push rod (2) through a connecting rod (75), an upper bus (4) and a lower bus (5) are arranged on the insulating shell (1), the upper bus (4) is connected with a moving contact of the vacuum arc extinguisher (3), the lower bus (5) is connected with a static contact of the vacuum arc extinguisher (3), and sealing glue is arranged on contact surfaces of the upper bus (4), the lower bus (5) and the insulating shell (1).

2. The hermetic low-voltage circuit breaker according to claim 1, characterized in that: still be equipped with reset spring (63) that are used for permanent magnet (61) to reset in cylinder body (6), the last edge of cylinder body (6) is equipped with backstop board (64), permanent magnet (61) are connected with backstop board (64) through reset spring (63).

3. The hermetic low-voltage circuit breaker according to claim 2, characterized in that: the vacuum arc extinguisher is characterized in that a guide column (21) is arranged at one end of the push rod (2), a groove (22) matched with the guide column (21) is formed in the insulating shell (1), the guide column (21) is arranged in the groove (22), an insulating pad (23) is arranged at the other end of the push rod (2), and the insulating pad (23) is connected with a moving contact of the vacuum arc extinguisher (3).

4. The hermetically sealed low voltage circuit breaker according to any one of claims 1 to 3, characterized in that: the vacuum arc extinguisher is characterized in that a limiting sleeve (24) is further arranged in the insulating shell (1), the push rod (2) is arranged in the limiting sleeve (24), and the upper bus (4) is electrically connected with a moving contact of the vacuum arc extinguisher (3) through a flexible connection (41).

5. The hermetic low-voltage circuit breaker according to claim 4, characterized in that: the bottom of cylinder body (6) still is equipped with blotter (65), blotter (65) are the arc arch and glue joint with cylinder body (6).