CN114446732A - Circuit breaker, power cabinet with structure and power assisting method - Google Patents

Abstract

The invention discloses a circuit breaker, relates to the technical field of circuit breakers, and comprises a rotating wheel and a power assisting mechanism. When the switch is switched on, the touch spring on the rotating wheel drives the locking wheel of the power assisting mechanism to rotate through the rotation of the rotating wheel, so that the lock head is enabled to be separated from the limiting groove of the power assisting rod, the pressure spring pushes the power assisting rod to impact the bottom of the rotating wheel, and power assistance is provided for the rotating wheel. Before the rotary switch-on and when just starting to switch-on (the contact spring is not contacted with the locking wheel), the power assisting mechanism is not contacted with the rotary wheel, so that the power assisting mechanism is prevented from becoming the resistance of the rotary wheel, and when the switch-on is carried out immediately (the contact spring is contacted with the locking wheel, the movable contact piece and the static contact piece are close to generate electric arc), the power assisting mechanism impacts the power assisting on the rotary wheel, so that the rotary wheel drives the movable contact piece to be contacted with the static contact piece, the rapid switch-on is realized, and the phenomenon that the movable contact piece and the static contact piece are close to generate the electric arc for too long time is avoided, and the movable contact piece and the static contact piece are damaged.

Description

Circuit breaker, power cabinet with structure and power assisting method

Technical Field

The invention relates to the technical field of circuit breakers, in particular to a circuit breaker and a power cabinet with the circuit breaker.

Background

In power equipment, a circuit breaker is usually used for switching on or switching off to achieve circuit connection or circuit disconnection, however, during switching on, a release is manually pushed through a handle to drive a movable contact to be in contact with a fixed contact, the movable contact and the fixed contact generate electric arcs when approaching a certain distance (not in contact), and the electric arcs disappear only after the movable contact is in contact with or is far away from the fixed contact.

In practical application, the situation that a part of people who do not contact electricity dare to rapidly push the handle to switch on the switch can occur, the main reason is that the force required for pushing the handle is larger and larger, and the psychological fear that the handle is damaged or the circuit generates faults after the handle is pushed is feared. For the reason, when the circuit breaker is frequently switched on, the movable contact in the circuit breaker can not be rapidly contacted with the fixed contact, so that the electric arc between the movable contact and the fixed contact is generated for a long time, and the contact is damaged.

Disclosure of Invention

One purpose of the invention is to solve the problem that when the circuit breaker in the prior art is switched on, a movable contact in the circuit breaker cannot be rapidly contacted with a fixed contact, so that the contact is damaged.

The invention also aims to provide the power cabinet with the circuit breaker.

The second purpose of the invention is to provide a power assisting method.

In order to achieve one of the purposes, the invention adopts the following technical scheme: the utility model provides a circuit breaker, includes the shell and sets up rotation wheel, tripping device, movable contact spring and static contact in the shell installation cavity, rotate the wheel with tripping device connects with the mode of linkage, the movable contact spring with tripping device links to each other, the movable contact spring with the static contact realizes the circular telegram through the mutual contact or realizes the outage through keeping away from each other, wherein, it is equipped with the contact clockwork spring to rotate the wheel outer lane, it is equipped with assist drive device to rotate side end direction.

The boosting mechanism comprises a bearing shell, the bearing shell is connected with a boosting rod in a sliding mode, a pressure spring is arranged between the boosting rod and the bearing shell, and the pressure spring is pre-compressed or pre-stretched to accumulate force.

The upper end of the bearing shell side is rotatably provided with a locking wheel matched with the trigger strip, the touch spring is in contact with the locking wheel after being driven by the rotating wheel, so that the touch spring drives the locking wheel to rotate, the locking wheel is connected with a lock head in a power connection mode, the lock head is connected in the bearing shell in a sliding mode, and the locking wheel drives the lock head to slide up and down through rotation of the lock head.

The boosting rod is provided with a limiting groove, and the lock head is clamped in the limiting groove.

In the technical scheme, when the circuit breaker provided by the embodiment of the invention is in an opening state, the movable contact piece and the static contact piece are far away from each other, and when the circuit breaker needs to be closed, the rotating wheel is pushed anticlockwise to rotate so as to drive the tripping mechanism to move, so that the movable contact piece under the tripping mechanism is close to the static contact piece until the movable contact piece is contacted with the static contact piece.

In the process that the rotating wheel is pushed to rotate, the contact spring on the outer ring of the rotating wheel is in contact with the locking wheel on the power assisting mechanism, the locking wheel is driven to rotate by the contact spring and the friction resistance of the locking wheel, and the locking wheel drives the lock head to slide upwards after rotating to enable the lock head to be separated from the limiting groove of the power assisting rod. After the lock head is separated from the limiting groove of the power-assisted rod, the pre-compressed or pre-stretched pressure spring releases elastic acting force, so that the power-assisted rod extends out of the bearing shell under the acting force of the pressure spring, the bottom of the rotating wheel is impacted from left to right, power is provided for anticlockwise rotation of the rotating wheel, the rotating wheel quickly drives the tripping mechanism to move, the movable contact is further quickly close to the static contact, the contact between the movable contact and the static contact is completed, and the switch-on is completed.

Further, in the embodiment of the invention, the touch spring is arranged in the middle of the outer ring of the rotating wheel, impact ports are formed in two sides of the outer ring of the rotating wheel, and the boosting rod is matched with the impact ports. Under the condition that no impact port is arranged, after the assistance rod impacts the rotating wheel, stress can be generally only applied to the bottom of the rotating wheel for a moment, and assistance brought by the rotating wheel is limited.

Further, in the embodiment of the invention, a handle is installed on the rotating wheel, and a return coil spring is sleeved at the rotating connection part of the rotating wheel. When the switch is switched on, the handle is manually pushed, so that the rotating wheel rotates anticlockwise under the driving of the handle.

Furthermore, in the embodiment of the present invention, a reel is connected to the side of the locking wheel, a rotating shaft is connected in series with the locking wheel and the reel and then is rotatably connected to the bearing shell, so that the locking wheel and the reel rotate synchronously under the action of an external force, a pull wire is wound on the reel, and the head end of the pull wire is connected to the upper end of the locking head.

Further, in the embodiment of the present invention, the rotation wheel is rotatably connected to one end of the power-assisted rod facing the rotation wheel, and a soft covering layer made of an elastic material is disposed on an outer surface of the rotation wheel. After helping hand pole and rotation wheel contact, can continue to rotate because of rotating the wheel, for reducing the helping hand pole to the resistance that rotates the wheel, through set up rotatable swiveling wheel at helping hand pole right-hand member, after swiveling wheel and rotation wheel contact, the swiveling wheel can be followed and rotated the wheel rotation, is favorable to reducing the helping hand pole to the resistance that rotates the wheel, improves the helping hand effect to rotating the wheel.

Further, in the embodiment of the present invention, a bias spring is disposed on the locking wheel, an avoiding opening for avoiding the locking wheel is disposed on the spring, a metal head is disposed on the assist lever, an electromagnet is disposed in the bearing shell, and the electromagnet is in contact with the metal head. When closing is completed, the locking wheel is positioned in the avoiding opening of the touch spring, the trigger strip does not damp the locking wheel any more, the locking wheel resets under the action of the biasing spring, simultaneously, when closing is completed, the static contact piece and the movable contact piece are in contact electrification, so that the electromagnet is electrified to generate a magnetic attraction metal head, the metal head drives the power assisting rod to reset under the attraction of the electromagnet, at the moment, the pressure spring is compressed or stretched to store force again, and the lock head is clamped into the limiting groove of the power assisting rod again (the lock head is in clearance fit with the limiting groove), so that power assistance is provided for next closing.

Further, in the embodiment of the present invention, an incoming line terminal, an outgoing line terminal and an electromagnetic release are further disposed in the housing installation cavity, the electromagnetic release includes a magnetic core shell and a coil skeleton disposed in the magnetic core shell, a winding coil is disposed on the coil skeleton, one end of the winding coil is connected to an incoming line contact pin of the incoming line terminal, the other end of the winding coil is connected to the static contact, and the outgoing line terminal is connected to the movable contact through the outgoing line contact pin.

The electromagnetic release is a common structure in the existing circuit breaker, the electromagnetic release only provides magnetic protection, namely short circuit protection, the electromagnetic release is actually a magnetic return force, and when the current is large enough (generally 10 to 12 times), the generated magnetic field force overcomes a main torsion spring (counter spring) in a release mechanism so as to drive a movable contact to be far away from a static contact, and the circuit is cut off.

Further, in the embodiment of the present invention, the fixed contact piece has a fixed contact, the movable contact piece has a movable contact matched with the fixed contact, the fixed contact includes an outer casing, and a right contact and a left contact wrapped by the outer casing, the right contact is telescopically connected with the left contact, a buffer gap is provided between the right contact and the left contact, a buffer air bag is provided in the buffer gap, and an air hole is provided on a side surface of the buffer air bag. When the switch is switched on, the movable contact on the movable contact can quickly impact the fixed contact on the fixed contact under the action of the power assisting mechanism, and the fixed contact is easy to deform after frequent times. When the buffering air bag is impacted, the air holes on the side of the buffering air bag exhaust, after the buffering air bag exhausts, the contact area of the right contact and the left contact is increased, and after the right contact and the left contact are electrified, the temperature rise is reduced, and the possibility of damage of the static contact is reduced.

The invention has the beneficial effects that: when the switch is switched on, the touch spring on the rotating wheel drives the locking wheel of the power assisting mechanism to rotate through the rotation of the rotating wheel, so that the lock head is separated from the limiting groove of the power assisting rod, the pressure spring pushes the power assisting rod to impact the bottom of the rotating wheel, and power assistance is provided for the rotating wheel. Before the rotary switch-on and when just starting to switch-on (the contact spring is not contacted with the locking wheel), the power assisting mechanism is not contacted with the rotary wheel, so that the power assisting mechanism is prevented from becoming the resistance of the rotary wheel, and when the switch-on is carried out immediately (the contact spring is contacted with the locking wheel, the movable contact piece and the static contact piece are close to generate electric arc), the power assisting mechanism impacts the power assisting on the rotary wheel, so that the rotary wheel drives the movable contact piece to be contacted with the static contact piece, the rapid switch-on is realized, and the phenomenon that the movable contact piece and the static contact piece are close to generate the electric arc for too long time is avoided, and the movable contact piece and the static contact piece are damaged.

In addition, after the closing is completed, the electromagnet can generate magnetic attraction to the metal head after being electrified, so that the metal head drives the power assisting rod to reset, and meanwhile, the locking wheel positioned at the trigger strip avoiding opening resets under the action of the biasing spring, so that the lock head is clamped into the limiting groove again, and the closing is performed next time. The power assisting mechanism is favorable for circularly assisting the rotating wheel, fast switching-on is realized, and the phenomenon that the movable contact piece and the static contact piece are damaged due to overlong time of electric arc generated after the movable contact piece and the static contact piece are close to each other is avoided.

In order to achieve the second purpose, the invention adopts the following technical scheme: a power supply cabinet having therein a circuit breaker as claimed in one of the above objects.

In order to achieve the third purpose, the invention adopts the following technical scheme: a method of assisting a circuit breaker, wherein the method is applied to a circuit breaker as set forth in one of the above objects, the method comprising the steps of:

when the switch needs to be switched on, the rotating wheel is pushed anticlockwise to rotate so as to drive the tripping mechanism to move, so that the movable contact piece under the tripping mechanism is close to the static contact piece until the movable contact piece is contacted with the static contact piece.

In the process that the rotating wheel is pushed to rotate, the contact spring on the outer ring of the rotating wheel is in contact with the locking wheel on the power assisting mechanism, the locking wheel is driven to rotate by the contact spring and the friction resistance of the locking wheel, and the locking wheel drives the lock head to slide upwards after rotating to enable the lock head to be separated from the limiting groove of the power assisting rod.

After the lock head is separated from the limiting groove of the power-assisted rod, the pre-compressed or pre-stretched pressure spring releases elastic acting force, so that the power-assisted rod extends out of the bearing shell under the acting force of the pressure spring, the bottom of the rotating wheel is impacted from left to right, power is provided for anticlockwise rotation of the rotating wheel, the rotating wheel quickly drives the tripping mechanism to move, the movable contact is further quickly close to the static contact, the contact between the movable contact and the static contact is completed, and the switch-on is completed.

Further, in the embodiment of the invention, when the closing is completed, the locking wheel is positioned in the avoiding opening of the contact spring, the trigger strip does not damp the locking wheel any more, the locking wheel is reset under the action of the biasing spring, simultaneously, when the closing is completed, the static contact piece and the movable contact piece are contacted and electrified, so that the electromagnet is electrified to generate a magnetic attraction metal head, the metal head drives the boosting rod to reset under the attraction of the electromagnet, at the moment, the pressure spring is compressed or stretched to accumulate the force again, and the locking head is clamped into the limiting groove of the boosting rod again so as to provide the boosting for the next closing.

Drawings

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

Fig. 2 is a schematic diagram illustrating a power assisting mechanism in a circuit breaker according to an embodiment of the present invention.

Fig. 3 is a schematic top view of a circuit breaker according to an embodiment of the invention.

Fig. 4 is a schematic structural view of an electromagnetic release according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a stationary contact according to an embodiment of the present invention.

In the drawings.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like 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 in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" 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.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. But it is obvious. To one of ordinary skill in the art, the embodiments may be practiced without limitation to these specific details. In some instances, methods and structures for boosting in known circuit breakers have not been described in detail to avoid unnecessarily obscuring these embodiments. In addition, all embodiments may be used in combination with each other.

The first embodiment is as follows:

a circuit breaker comprises a shell 10, a rotating wheel 20, a tripping mechanism 30, a movable contact piece 40 and a static contact piece 50, wherein the rotating wheel 20, the tripping mechanism 30, the movable contact piece 40 and the static contact piece 50 are arranged in a mounting cavity 11 of the shell 10, the rotating wheel 20 and the tripping mechanism 30 are connected in a linkage mode, the movable contact piece 40 is connected with the tripping mechanism 30, the movable contact piece 40 and the static contact piece 50 are mutually contacted to realize power-on or mutually separated to realize power-off, a contact spring 22 is arranged on the outer ring of the rotating wheel 20, and a power assisting mechanism 60 is arranged in the side end direction of the rotating wheel 20.

As shown in fig. 2, the power assisting mechanism 60 includes a bearing shell 61, the bearing shell 61 is slidably connected to a power assisting rod 62, a pressure spring 63 is disposed between the power assisting rod 62 and the bearing shell 61, and the pressure spring 63 is pre-compressed or pre-tensioned to store force.

The upper end of the side of the bearing shell 61 is rotatably provided with a locking wheel 64 matched with the trigger bar 22, the trigger spring 22 is driven by the rotating wheel 20 to be in contact with the locking wheel 64, so that the trigger spring 22 drives the locking wheel 64 to rotate, a lock head 642 is connected to the lower part of the locking wheel 64 in a power connection mode, the lock head 642 is connected in the bearing shell 61 in a sliding mode, and the locking wheel 64 drives the lock head 642 to slide up and down through self rotation.

The power-assisted rod 62 is provided with a limiting groove 621, and the lock head 642 is clamped in the limiting groove 621.

The implementation steps are as follows: when the breaker is in an opening state, the movable contact piece 40 and the static contact piece 50 are far away from each other, and when the breaker needs to be closed, the rotating wheel 20 is pushed anticlockwise to rotate so as to drive the tripping mechanism 30 to move, so that the movable contact piece 40 below the tripping mechanism 30 is close to the static contact piece 50 until the movable contact piece 40 is contacted with the static contact piece 50.

During the process that the rotor 20 is pushed to rotate, the touch spring 22 on the outer ring of the rotor 20 contacts with the locking wheel 64 on the boosting mechanism 60, the locking wheel 64 is driven to rotate by the touch spring 22 and the locking wheel 64 through the frictional resistance, and the locking wheel 64 drives the lock head 642 to slide upwards after rotating, so that the lock head 642 is driven to be disengaged from the limiting groove 621 of the boosting rod 62. After the lock 642 is separated from the limit groove 621 of the assisting rod 62, the pre-compressed or pre-stretched pressure spring 63 releases the elastic acting force, so that the assisting rod 62 extends out of the bearing shell 61 under the acting force of the pressure spring 63, and impacts the bottom of the rotating wheel 20 from left to right to provide assisting force for the counterclockwise rotation of the rotating wheel 20, so that the rotating wheel 20 quickly drives the tripping mechanism 30 to move, further the movable contact piece 40 quickly approaches the stationary contact piece 50, and the contact between the movable contact piece 40 and the stationary contact piece 50 is completed, thereby completing the closing.

The trip mechanism 30 is a structure commonly used in circuit breakers, and reference is made to the residual current operated circuit breaker disclosed in CN109585232A, and the applicant does not describe in detail here.

As shown in fig. 3, the touch spring 22 is disposed in the middle of the outer ring of the rotary wheel 20, impact ports 23 are formed on both sides of the outer ring of the rotary wheel 20, and the assist lever 62 is engaged with the impact ports 23. In the case where the impact port 23 is not provided, after the assist lever 62 impacts the rotary wheel 20, stress is generally applied to the bottom of the rotary wheel 20 only for a moment, and the assist force applied to the rotary wheel 20 is limited, mainly because, after the assist lever 62 contacts the rotary wheel 20, the assist lever 62 cannot move right to push the rotary wheel 20, but rather becomes a resistance to the rotation of the rotary wheel 20, and the assist effect on the rotary wheel 20 is reduced, and therefore, by providing the impact port 23 on the outer ring of the rotary wheel 20, the power-assisted lever 62 can push the rotary wheel 20 to the right after the power-assisted lever 62 contacts the rotary wheel 20, meanwhile, the rotating wheel 20 rotates counterclockwise, and the rotating wheel 20 does not become the limit of the assisting rod 62 due to the impact port 23 (because the rotating wheel 20 has a limited rotation angle when the switch is closed), therefore, the impact opening 23 is provided in the outer ring of the rotary wheel 20, which is advantageous for improving the boosting effect on the rotary wheel 20 (the effect of the boosting effect affects the closing time).

As shown in fig. 1, a handle 21 is mounted on the rotary wheel 20, and a return coil spring 24 is sleeved at the rotary connection of the rotary wheel 20. When the switch is closed, the handle 21 is manually pushed, so that the rotating wheel 20 is driven by the handle 21 to rotate anticlockwise.

As shown in fig. 2, a spool 641 is connected to the locking pulley 64, and a rotating shaft is connected to the load housing 61 after interlocking the locking pulley 64 and the spool 641 in series, so that the locking pulley 64 and the spool 641 rotate synchronously under the action of external force, and a wire is wound around the spool 641, and the head end of the wire is connected to the upper end of the lock 642.

The assisting rod 62 is rotatably connected to a rotating wheel 65 at one end facing the rotating wheel 20, and a soft covering layer made of elastic material is arranged on the outer surface of the rotating wheel 65. After helping hand pole 62 contacts with rotating wheel 20, can continue to rotate because of rotating wheel 20, for reducing the resistance of helping hand pole 62 to rotating wheel 20, through set up rotatable swiveling wheel 65 at helping hand pole 62 right-hand member, after swiveling wheel 65 and rotating wheel 20 contact, swiveling wheel 65 can follow and rotate wheel 20 and rotate, is favorable to reducing the resistance of helping hand pole 62 to rotating wheel 20, improves the helping hand effect to rotating wheel 20.

As shown in fig. 1 and 2, a bias spring is arranged on the locking wheel 64, an avoidance opening is arranged on the trigger strip 22, the avoidance locking wheel 64 is an avoidance opening, a metal head 66 is arranged on the power-assisted rod 62, an electromagnet 67 is arranged in the bearing shell 61, and the electromagnet 67 is in contact with the metal head 66. When closing is completed, the locking wheel 64 is located in an avoiding opening of the touch spring 22, the trigger bar 22 does not damp the locking wheel 64 any more, the locking wheel 64 resets under the action of a biasing spring, meanwhile, when closing is completed, the static contact piece 50 is in contact with the movable contact piece 40 and powered on, so that the electromagnet 67 is powered on to generate a magnetic attraction metal head 66, the metal head 66 drives the power assisting rod 62 to reset under the attraction of the electromagnet 67, at the moment, the pressure spring 63 is compressed or stretched to accumulate force again, and the lock head 642 is clamped into the limiting groove 621 of the power assisting rod 62 again (the lock head 642 is in clearance fit with the limiting groove 621), so that power assistance is provided for next closing.

As shown in fig. 1 and 4, a wire inlet terminal 70, a wire outlet terminal 80 and an electromagnetic release 90 are further disposed in the mounting cavity 11 of the housing 10, the electromagnetic release 90 includes a magnetic core case 91 and a coil bobbin 92 disposed in the magnetic core case 91, a winding coil 93 is disposed on the coil bobbin 92, one end of the winding coil 93 is connected to the wire inlet tab 71 of the wire inlet terminal 70, the other end of the winding coil 93 is connected to the stationary contact 50, and the wire outlet terminal 80 is connected to the movable contact 40 through the wire outlet tab 81.

The electromagnetic release 90 is a structure commonly used in the existing circuit breaker, the electromagnetic release 90 only provides magnetic protection, that is, short circuit protection, and the electromagnetic release 90 is actually a magnetic return force, and when the current is large enough (generally 10 to 12 times), the generated magnetic force overcomes the main torsion spring (counter spring) in the trip mechanism 30 to drive the movable contact piece 40 to be far away from the static contact piece 50, so as to cut off the circuit.

As shown in fig. 5, the fixed contact 50 has a fixed contact 51, the movable contact 40 has a movable contact 41 matching with the fixed contact 51, the fixed contact 51 includes an outer casing 511, and a right contact 512 and a left contact 513 wrapped by the outer casing 511, the right contact 512 and the left contact 513 are telescopically connected, a buffer gap 514 is provided between the right contact 512 and the left contact 513, a buffer air bag 52 is provided in the buffer gap 514, and an air hole 53 is opened on the side surface of the buffer air bag 52. When the switch is closed, the movable contact 41 on the movable contact piece 40 quickly impacts the fixed contact 51 on the fixed contact piece 50 due to the action of the power assisting mechanism 60, and the fixed contact 51 is easily deformed after frequent times. When the buffer air bag 52 is impacted, the air holes 53 on the side of the buffer air bag are exhausted, after the buffer air bag 52 is exhausted, the contact area between the right contact 512 and the left contact 513 is increased, and after the right contact 512 and the left contact 513 are electrified, the temperature rise is reduced, and the possibility of damage to the static contact 51 is reduced.

The invention has the beneficial effects that: when the switch is switched on, the rotation of the rotating wheel 20 enables the touch spring 22 on the rotating wheel 20 to drive the locking wheel 64 of the power assisting mechanism 60 to rotate, the lock head 642 is enabled to be separated from the limiting groove 621 of the power assisting rod 62, and the pressure spring 63 enables the power assisting rod 62 to push the bottom of the rotating wheel 20 to impact, so that power assistance is provided for the rotating wheel 20. Before the rotary wheel 20 is rotated to close and when the rotary wheel 20 just starts to close (the contact spring 22 is not contacted with the locking wheel 64), the boosting mechanism 60 is not contacted with the rotary wheel 20, so that the boosting mechanism 60 is prevented from becoming resistance of the rotary wheel 20, when the rotary wheel is closed (the contact spring 22 is contacted with the locking wheel 64, and the movable contact piece 40 is close to the static contact piece 50 to generate electric arc), the boosting mechanism 60 impacts boosting on the rotary wheel 20, so that the rotary wheel 20 drives the movable contact piece 40 to be contacted with the static contact piece 50, quick closing is realized, and the phenomenon that the electric arc is generated after the movable contact piece 40 is close to the static contact piece 50 for too long time is avoided, and the movable contact piece 40 and the static contact piece 50 are damaged.

In addition, after the closing is completed, the electromagnet 67 is energized to magnetically attract the metal head 66, so that the metal head 66 drives the assisting rod 62 to reset, and meanwhile, the locking wheel 64 at the avoiding opening of the spring 22 resets under the action of the biasing spring, so that the lock 642 is clamped into the limiting groove 621 again, and the next closing is performed. The power assisting mechanism 60 is favorable for circularly assisting the rotating wheel 20, the rapid switching-on is realized, and the phenomenon that the movable contact piece 40 and the static contact piece 50 are damaged due to the fact that the arc is generated after the movable contact piece 40 and the static contact piece 50 are close to each other for too long time is avoided.

Example two:

a power supply cabinet is provided with the circuit breaker in the first embodiment.

Example three:

a power assisting method is applied to a circuit breaker in the first embodiment and comprises the following steps of:

when the switch is needed to be switched on, the rotating wheel 20 is pushed anticlockwise to rotate so as to drive the tripping mechanism 30 to move, so that the movable contact piece 40 below the tripping mechanism 30 is close to the static contact piece 50 until the movable contact piece 40 is contacted with the static contact piece 50.

During the process that the rotor 20 is pushed to rotate, the touch spring 22 on the outer ring of the rotor 20 contacts with the locking wheel 64 on the boosting mechanism 60, the locking wheel 64 is driven to rotate by the touch spring 22 and the locking wheel 64 through the frictional resistance, and the locking wheel 64 drives the lock head 642 to slide upwards after rotating, so that the lock head 642 is driven to be disengaged from the limiting groove 621 of the boosting rod 62.

After the lock 642 is separated from the limit groove 621 of the assisting rod 62, the pre-compressed or pre-stretched pressure spring 63 releases the elastic acting force, so that the assisting rod 62 extends out of the bearing shell 61 under the acting force of the pressure spring 63, and impacts the bottom of the rotating wheel 20 from left to right to provide assisting force for the counterclockwise rotation of the rotating wheel 20, so that the rotating wheel 20 quickly drives the tripping mechanism 30 to move, further the movable contact piece 40 quickly approaches the stationary contact piece 50, and the contact between the movable contact piece 40 and the stationary contact piece 50 is completed, thereby completing the closing.

When closing is completed, the locking wheel 64 is positioned in an avoiding opening of the contact spring 22, the trigger strip 22 does not damp the locking wheel 64 any more, the locking wheel 64 resets under the action of a biasing spring, meanwhile, when closing is completed, the static contact piece 50 is in contact with the movable contact piece 40 and powered on, so that the electromagnet 67 is powered on to generate a magnetic attraction metal head 66, the metal head 66 drives the assisting rod 62 to reset under the attraction of the electromagnet 67, at the moment, the pressure spring 63 is compressed or stretched to accumulate force again, and the lock head 642 is clamped into the limiting groove 621 of the assisting rod 62 again to provide assisting force for next closing.

Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is apparent to those skilled in the art that all the inventive concepts using the present invention are protected as long as they can be changed within the spirit and scope of the present invention as defined and defined by the appended claims.

Claims (10)

1. A circuit breaker comprises a shell, a rotating wheel, a tripping mechanism, a movable contact piece and a static contact piece, wherein the rotating wheel, the tripping mechanism, the movable contact piece and the static contact piece are arranged in a shell installation cavity;

the power-assisted mechanism comprises a bearing shell, the bearing shell is connected with a power-assisted rod in a sliding mode, a pressure spring is arranged between the power-assisted rod and the bearing shell, and the pressure spring is pre-compressed or pre-stretched to accumulate force;

the upper end of the side of the bearing shell is rotatably provided with a locking wheel matched with the trigger strip, the touch spring is driven by the rotating wheel to be in contact with the locking wheel, so that the touch spring drives the locking wheel to rotate, a lock head is connected under the locking wheel in a power connection mode, the lock head is connected in the bearing shell in a sliding mode, and the locking wheel drives the lock head to slide up and down through self rotation;

the boosting rod is provided with a limiting groove, and the lock head is clamped in the limiting groove.

2. The circuit breaker according to claim 1, wherein the trigger spring is disposed in the middle of the outer ring of the rotating wheel, impact ports are formed on both sides of the outer ring of the rotating wheel, and the boosting rod is engaged with the impact ports.

3. The circuit breaker as claimed in claim 1, wherein the rotary wheel is provided with a handle, and a return coil spring is sleeved at a rotary joint of the rotary wheel.

4. The circuit breaker as claimed in claim 1, wherein a reel is connected to the locking wheel side, a shaft is connected in series with the reel and then rotatably connected to the load housing, so that the locking wheel and the reel rotate synchronously under the action of external force, a pull wire is wound around the reel, and the head end of the pull wire is connected to the upper end of the locking head.

5. The circuit breaker as claimed in claim 1, wherein the power-assisted lever is rotatably connected with a rotation wheel on one end of the rotation wheel, and a soft covering layer made of elastic material is disposed on an outer surface of the rotation wheel.

6. The circuit breaker as claimed in claim 1, wherein a metal head is disposed on the assist lever, an avoiding opening is disposed on the contact spring to avoid the locking wheel, an electromagnet is disposed in the bearing housing and contacts with the metal head, and after the movable contact contacts with the stationary contact and is energized, the electromagnet is energized to generate magnetism to attract the metal head.

7. The circuit breaker as claimed in claim 1, wherein a wire inlet terminal, a wire outlet terminal and an electromagnetic release are further disposed in the housing installation cavity, the electromagnetic release includes a magnetic core housing and a coil bobbin disposed in the magnetic core housing, a winding coil is disposed on the coil bobbin, one end of the winding coil is connected to the wire inlet tab of the wire inlet terminal, the other end of the winding coil is connected to the stationary contact, and the wire outlet terminal is connected to the movable contact through the wire outlet tab.

8. The circuit breaker according to claim 1, wherein the fixed contact piece has a fixed contact, the movable contact piece has a movable contact matched with the fixed contact, the fixed contact comprises an outer casing and a right contact and a left contact wrapped by the outer casing, the right contact is telescopically connected with the left contact, a buffer gap is provided between the right contact and the left contact, a buffer air bag is provided in the buffer gap, and an air hole is opened on the side surface of the buffer air bag.

9. A power supply cabinet, characterized by a circuit breaker according to any of the preceding claims 1-8.

10. A method of assisting power, applied to a circuit breaker according to any one of claims 1 to 8, comprising the steps of:

when the switch needs to be switched on, the rotating wheel is pushed anticlockwise to rotate so as to drive the tripping mechanism to move, so that the movable contact piece under the tripping mechanism is close to the static contact piece until the movable contact piece is contacted with the static contact piece;

in the process that the rotating wheel is pushed to rotate, a contact spring on the outer ring of the rotating wheel is in contact with a locking wheel on the boosting mechanism, the locking wheel is driven to rotate by the contact spring through the friction resistance of the contact spring and the locking wheel, and the locking wheel drives the lock head to slide upwards after rotating to enable the lock head to be separated from a limiting groove of the boosting rod;

after the lock head is separated from the limiting groove of the power-assisted rod, the pre-compressed or pre-stretched pressure spring releases elastic acting force, so that the power-assisted rod extends out of the bearing shell under the acting force of the pressure spring, the bottom of the rotating wheel is impacted from left to right, power is provided for anticlockwise rotation of the rotating wheel, the rotating wheel quickly drives the tripping mechanism to move, the movable contact is further quickly close to the static contact, the contact between the movable contact and the static contact is completed, and the switch-on is completed.

Images