CN110120321B - A closed low-voltage circuit breaker - Google Patents

Abstract

The invention discloses a hermetic low-voltage circuit breaker, comprising an insulating shell, and a push rod, a reset device, a driving device for driving the push rod to move up and down, and a vacuum arc extinguisher are arranged in the insulating shell. The integrally formed cylinder body, the permanent magnet set in the cylinder body, and the permanent magnet set on the outer wall of the cylinder are used to drive the permanent magnet moving coil. The driving device is connected with the push rod through a transmission mechanism, and the transmission mechanism includes a cross bar, a gear set and a rack. The cross bar is connected with the permanent magnet and is meshed with the gear set, the rack is meshed with the gear set and is connected with the push rod through a connecting rod, and the insulating shell is provided with upper contacts respectively connected with the moving contact and the static contact of the vacuum arc extinguisher. The contact surfaces of the busbar and the lower busbar, the upper busbar, the lower busbar and the insulating shell are all provided with sealant. The beneficial effects of the present invention are as follows: by means of electromagnetic drive, the internal structure of the low-voltage circuit breaker is completely separated from the external connection, and the use safety of the low-voltage circuit breaker in harsh environments is effectively guaranteed.

Description

A closed low-voltage circuit breaker

technical field

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

Background technique

As a low-voltage electrical appliance, low-voltage circuit breakers have the functions of overload, short-circuit and under-voltage protection. In daily applications, universal air circuit breakers are generally used to control distribution lines and protect equipment. Since its contact parts are bare, the contacts will generate electric sparks during the opening and closing process. When there is flammable and explosive gas or dust in the air, once it comes into contact with the electric sparks, there may be an explosion hazard. Therefore, low-voltage circuit breakers with vacuum interrupters are usually used in more complex environments. However, due to the strong mechanical properties of vacuum interrupters, aging leakage will occur in long-term use or in harsh environments. If the gas and arc extinguishing function are lost, this will lead to sparks still in contact with the outside world, causing certain safety hazards.

SUMMARY OF THE INVENTION

In view of this, the technical problem to be solved by this application is to provide a sealed low-voltage circuit breaker, which effectively solves the potential safety hazard caused by the aging of the vacuum arc extinguisher by means of double isolation. In order to solve the above technical problems, the present application discloses a hermetic low-voltage circuit breaker, comprising an insulating shell, a push rod and a vacuum arc extinguisher are arranged in the insulating shell, and the insulating shell is also provided with a push rod for driving the push rod up and down A moving driving device, the driving device includes a cylinder, a permanent magnet and a coil, the permanent magnet is arranged inside the cylinder, the outer wall of the cylinder is provided with a coil for driving the permanent magnet to move, the cylinder is insulated from the The shell is integrally formed, the drive device is connected with the push rod through a transmission mechanism, the transmission mechanism includes a cross bar, a gear set and a rack, one end of the cross rod is connected with the permanent magnet and is provided with a matching gear set. Tooth shape, the gear set meshes with the tooth shape on the cross bar, the inner wall of the insulating shell is provided with a chute perpendicular to the cross bar, the rack is arranged in the chute and meshes with the gear set, One end of the rack is connected with the push rod through a connecting rod, the insulating shell is provided with an upper busbar and a lower busbar, the upper busbar is connected with the moving contact of the vacuum arc extinguisher, and the lower busbar is connected with the vacuum extinguisher. The static contacts of the arcer are connected, and the contact surfaces of the upper busbar, the lower busbar and the insulating shell are all provided with sealant.

More preferably: the cylinder body is also provided with a return spring for restoring the permanent magnet, the upper edge of the cylinder body is provided with a stop plate, and the permanent magnet is connected to the stop plate through the return spring. By adding a return spring in the cylinder, the permanent magnet can be pushed back to the initial position when the coil is powered off, which simplifies the control mode of the circuit breaker.

More preferably: one end of the push rod is provided with a guide column, the insulating shell is provided with a groove matching the guide column, the guide column is arranged in the groove, and the other end of the push rod is provided with a groove. There is an insulating pad, which is connected with the moving contact of the arc extinguisher. Through the setting of the guide column, the direction of the movement of the push rod can be controlled more accurately, and considering the service life of the push rod, the push rod is generally made of metal. The insulating pad is added to better connect the push rod with the arc extinguisher. Electrical isolation.

More preferably: the insulating shell is further provided with a limit sleeve, the push rod is arranged in the limit sleeve, and the upper busbar is electrically connected to the movable contact of the vacuum arc extinguisher through a soft connection.

More preferably: the bottom of the cylinder body is also provided with a buffer pad, and the buffer pad is in the shape of an arc and is glued to the cylinder body. This is to prevent the permanent magnet from being damaged due to the contact between the permanent magnet and the inner wall of the cylinder due to the pulling of the spring when the return spring is reset.

More preferably: the gear set includes a driving wheel, a driven wheel and a driving wheel, the radius of the driving wheel is much larger than that of the driven wheel, and the driving wheel and the driven wheel are coaxially connected. Through such a connection method, the stroke of the rack can be increased, and the occupancy rate of the driving device in the insulating housing can be reduced.

More preferably: the outside of the cylinder is further provided with a dust cover, and the dust cover is detachably connected with the insulating shell. Play the role of dustproof the cylinder and prolong the life of the cylinder.

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

1) Not only the arc is isolated from the external connection by the vacuum arc extinguisher, but also the original decoupling protection mechanism is also isolated from the external connection, which improves the overall sealing performance of the circuit breaker;

2) By means of electromagnetic drive, the control process is simplified, the internal mechanism is completely isolated from the outside world, and the sealing performance is further improved.

Of course, implementing any product of the present application does not necessarily need to simultaneously achieve all the above-mentioned technical effects.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

1 is a schematic diagram of the overall structure of an embodiment of an enclosed low-voltage circuit breaker of the present application;

2 is a schematic structural diagram of a drive device when the circuit breaker is closed according to an embodiment of the closed low-voltage circuit breaker of the present application;

3 is a schematic structural diagram of the drive device when the circuit breaker is opened according to an embodiment of the closed low-voltage circuit breaker of the present application;

4 is a schematic diagram of the push rod structure of an embodiment of the closed low-voltage circuit breaker of the present application;

FIG. 5 is a schematic structural diagram of a gear set according to an embodiment of the sealed low-voltage circuit breaker of the present application.

Description of symbols in the figure: 1. Insulation shell, 2. Push rod, 3. Vacuum interrupter, 4. Upper busbar, 5. Lower busbar, 6. Cylinder block, 7. Transmission mechanism, 8. Dust cover, 21, Guide post, 22, Groove, 23, Insulation pad, 24, Limit sleeve, 61, Permanent magnet, 62, Coil, 63, Return spring, 64, Stop plate, 65, Cushion pad, 71, Cross bar, 72 , Gear set, 73, rack, 74, chute, 75, connecting rod, 721, driving wheel, 722, driven wheel, 723, driving wheel.

Detailed ways

The embodiments of the present application will be described in detail below with reference to the accompanying drawings and examples, so as to fully understand and implement the implementation process of how to apply technical means to solve technical problems and achieve technical effects in the present application.

As shown in FIGS. 1 to 3 : a hermetic low-voltage circuit breaker according to an embodiment of the present application includes an insulating shell 1, a push rod 2 and a vacuum arc extinguisher 3, and the push rod 2 is connected to the vacuum arc extinguisher 3 for controlling The contact and separation of the static contact and the moving contact of the vacuum arc extinguisher; a driving device for driving the push rod 2 to move up and down is also provided in the insulating shell 1, and the driving device includes a cylinder 6, a permanent magnet 61 and a coil 62, The permanent magnet 61 is arranged inside the cylinder 6, and lubricating oil is applied to the contact surface of the permanent magnet 61 and the inner wall of the cylinder 6. The outer wall of the cylinder 6 is provided with a coil 62 for driving the permanent magnet 61 to move, and the coil 62 is energized. The polarity of the generated magnetic field is the same as the polarity of the magnet, and the permanent magnet is driven to move in the cylinder 6. In order to achieve the overall sealing, the cylinder 6 and the insulating shell 1 are integrally formed; the driving device communicates with the push rod 2 through a transmission mechanism 7. The transmission mechanism 7 includes a cross bar 71, a gear set 72 and a rack 73. One end of the cross bar 71 is connected to the permanent magnet 61 and is provided with a tooth shape that matches the gear set 72. In order to lift the cross bar 71 and the permanent magnet 61 A permanent magnet with a through hole in the middle can be selected, and then one end of the cross bar 71 is polished and inserted into the through hole, and then glued with glue. There is a chute 74 perpendicular to the cross bar 71 on the inner wall of the gear rack 73, the rack 73 is arranged in the chute 74 and meshes with the gear set 72, one end of the rack 73 is connected with the push rod 2 through a connecting rod 75, when When the rack 73 moves, the push rod 2 is pushed up and down by the lever principle through the connecting rod 75; the insulating shell 1 is provided with an upper bus bar 4 and a lower bus bar 5, and the upper bus bar 4 is connected with the moving contact of the vacuum interrupter 3, The lower busbar 5 is connected to the static contact of the vacuum arc extinguisher 3 , the upper busbar 4 and the lower busbar 5 are fixed on the insulating shell 1 by micro bolts, and the contact surfaces with the insulating shell 1 are provided with sealant.

Due to the use of electromagnetic drive, in the process of closing and opening, it is necessary to pass the current in the opposite direction in the coil 62, which increases the difficulty of control. The return spring 63, the upper edge of the cylinder block 6 is provided with a stop plate 64, the stop plate 64 is fixed on the insulating shell 1 by micro bolts, and the permanent magnet 61 is connected with the stop plate 64 through the return spring 63, so that, It only needs to be considered that the coil 62 gives a driving force to the permanent magnet 61 when the switch is closed. When the coil is opened, the coil 61 is de-energized, and the return spring 63 can push the permanent magnet 61 to move to perform the opening operation.

A guide post 21 is provided at one end of the push rod 2, and a groove 22 matching the guide post 21 is provided in the insulating shell 1. The guide post 21 is arranged in the groove 22 and plays a guiding role in the movement of the push rod 2. In addition, in order to prolong the service life of the push rod 2, the push rod 2 is made of metal, and the other end of the push rod 2 is provided with an insulating pad 23, and the insulating pad 23 is connected with the moving contact of the arc extinguisher 3 to play the role of the push rod 2 Insulation with the arc extinguisher 3, the insulating shell 1 is also provided with a limit sleeve 24, the push rod 2 is set in the limit sleeve 24, and the upper bus bar 4 is in dynamic contact with the vacuum arc extinguisher 3 through a soft connection 41. head electrical connection.

During the opening process, the return spring 63 will give the permanent magnet 61 a restoring force, and during the restoring process, the return spring 63 may produce an elongated deformation, causing the permanent magnet 61 to collide with the bottom of the cylinder 6 Therefore, a buffer pad 65 is also provided at the bottom of the cylinder block 6. The buffer pad 65 is arc-shaped and is glued to the cylinder block 6, which can play a good buffering effect on the permanent magnet 61. Outside the cylinder block 6 A dust cover 8 is also provided, and the dust cover 8 is detachably connected with the insulating shell 1. Preferably, a groove can be provided on the insulating shell 1, a buckle is arranged on the dust cover 8, and the dust cover 8 is connected to the insulating shell 1. The insulating shell 1 is snapped.

The beneficial effects of the present invention are as follows: by means of electromagnetic drive, the internal structure of the low-voltage circuit breaker is completely separated from the external connection, and the use safety of the low-voltage circuit breaker in harsh environments is effectively guaranteed.

The foregoing description shows and describes several preferred embodiments of the present invention, but as previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein, and should not be construed as an exclusion of other embodiments, but may be used in various and other combinations, modifications and environments, and can be modified within the scope of the inventive concepts described herein, from the above teachings or from skill or knowledge in the relevant art. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all fall within the protection scope of the appended claims of the present invention.

Claims (5)

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).

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