Lockable contact component of low-voltage circuit breaker
Technical field
The present invention relates to the contact component of low-pressure plastic shell circuit breaker, by the operating mechanism driven rotary of circuit breaker.
Background technology
At present, mould the case low-voltage circuit breaker moving contact part and form, drive the rotor rotation by the bar on the operating mechanism by rotor, contact and gripping mechanism etc., by the rotation of rotor realize moving contact deciliter.Wherein, the principle of gripping mechanism is to utilize contact or epitrochanterian edge to scold when reaching stuck position at contact, and the contact-making surface between rotor or contact and accessory blocks contact.But, above-mentioned contact-making surface can cause blocking insecure problem because of the wearing and tearing of contact-making surface after repeatedly blocking, moving contact is not reliably blocked after electrodynamic repulsion force is scolded out and fall after rise, thereby cause restriking of electric arc in the arc control device, be unfavorable for the disjunction of circuit breaker.
Summary of the invention
The objective of the invention is provides a kind of Lockable contact component of low-voltage circuit breaker for overcoming above-mentioned the deficiencies in the prior art, and moving contact can be stuck after electrodynamic repulsion force is scolded out reliably.
The technical solution used in the present invention is: contact runs through along the radial symmetric of rotor, contact is coaxial with the center of rotation of rotor, symmetry is fixed two connecting rods 3 on the contact two sides, and symmetry is fixed two connecting rods 4 on rotor, and connecting rod 4 passes rotor and parallel with connecting rod 3; Axial symmetry is installed two springs in the dead slot of contact two sides and rotor, and wherein an end of a spring is fixed on the connecting rod 3, and the other end is fixed on the connecting rod 4 on opposite; One end of another root spring is fixed on the connecting rod 4, and the other end is fixed on the connecting rod 3 on opposite; Two connecting rods 3 on the described contact have and 3 positions that are linked to be a line of contact fulcrum, described epitrochanterian two connecting rods 4 have and 3 positions that are linked to be another line of rotor rotation central point, and spring has the position that these two lines are overlapped.
The installation direction of described spring is parallel with the contact two sides.
The invention has the beneficial effects as follows:
1, the present invention designs accordingly to spring force, when under the effect of contact at electrodynamic repulsion force during spinning movement, spring is stretched to the most microscler one-tenth dead-centre position, after contact drive spring passes through this position, dead point like a cork, spring changes to the rotation direction of contact, contact is moved to the separating brake direction by the effect of recoil of spring power, thereby blocks contact reliably.
When 2, in a single day contact was subjected to electrodynamic repulsion force and scolds out a smaller angle, spring can block contact rapidly, prevents the falling of contact.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is a front view of the present invention.
Fig. 2 is the cutaway view of Fig. 1 in the B-B position.
Fig. 3 is the cutaway view of Fig. 1 in the C-C position.
Fig. 4 is the cutaway view of Fig. 3 in the D-D position.
Among the figure: 1. rotor; 2 contacts; 3. connecting rod; 4. connecting rod; 5. spring; 7.. dead slot; 8 holes..
Embodiment
As shown in the figure, rotor 1 is an axially symmetric structure, axial middle part at rotor 1, contact 2 runs through towards the radial symmetric of rotor 1, contact 2 is coaxial with the center of rotation of rotor 1, contact 2 rotates in the dead slot 7 of rotor 1 with this center of rotation, and contact 2 can freely turn round action between make position and open position, and the line of contact 2 centers of rotation and connecting rod 4 is freely rotated at the cavity place.
On the two sides of contact 2, fix two connecting rods 3 with the center of rotation symmetry of contact 2.On rotor 1, fix two connecting rods 4 with this center of rotation symmetry, connecting rod 4 passes pair of holes on the rotor 1 and parallel with connecting rod 3.
Axial symmetry is installed two springs 5 in the dead slot 7 of the two sides of contact 2, rotor 1, and the installation direction of spring 5 is parallel with contact 2 two sides, makes wherein that an end of a spring 5 is fixed on the connecting rod 3, and the other end is fixed on the connecting rod 4 on opposite; One end of another root spring 5 is fixed on the connecting rod 4, and the other end is fixed on the connecting rod 3 on opposite.
When scolding out motion under the effect of contact 2 at electrodynamic repulsion force, because the mechanical resistance of spring 5 hinders contact 2 motions, the such position of meeting process: promptly 3 of the central points of two connecting rods 3 on the fulcrum of contact 2 and the contact 2 are linked to be a line, have and 3 positions that become line of fulcrum during two connecting rods 3 designs.3 of the central points of two connecting rods 4 on the fulcrum of rotor 1 and the rotor 1 are linked to be another line, should have 3 positions that become line of fulcrum with rotor 1 during two connecting rod 4 designs.When these two lines overlap, form the dead-centre position of spring 5.
When contact 2 was in closing position, an end of spring 5 was fixed on the connecting rod 4, and connecting rod 4 is static with respect to rotor 1.Spring 5 provides contact pressure by 3 pairs of contacts 2 of connecting rod, and contact 2 is rotatable with respect to rotor 1; Contact 2 is rotatable with respect to connecting rod 4.Scolded by electrodynamic repulsion force by "on" position at contact 2 and to reach in the gate-dividing state process, rotor 1 does not rotate all the time; Spring 5 by with contact 2 on 3 pairs of contacts 2 of connecting rod apply contact pressure.
When being short-circuited electric current, contact 2 can be scolded under the effect of electrodynamic repulsion force and held, contact 2 is scolded in the open procedure, contact 2 overcomes the power motion of spring 5, and when contact 2 motions made the direction of the power of spring 5 pass through above-mentioned dead-centre position, the rebound effect of 5 pairs of contacts 2 of spring made contact 2 rotation trend change, contact 2 moves rapidly towards the separating brake position, remain on gate-dividing state simultaneously, thereby locked contact 2, prevent that contact 2 from falling once more.
On rotor 1, be provided with pair of holes 8 and match, the power resources of this contacts of low-voltage circuit breaker functional unit are provided with the circuit breaker operation mechanism bar.When circuit breaker operation mechanism moved, rotor 1 rotated under the drive of circuit breaker operation mechanism, and spring 5 is resetted.