CN113972116A - Contact mechanism and switching device - Google Patents

Abstract

A contact mechanism and switching device, the contact mechanism includes a Y-shaped moving contact, and the static contact that the first static contact and second static contact make up; the moving contact comprises two moving contact arms and a moving contact connecting arm, the first fixed contact is a U-shaped structure capable of reversing current, and comprises a first static contact plate and a first static connecting plate, the first static contact plate is used for being matched with the moving contact, and the first static connecting plate is connected with the first static contact plate; the two moving contact arms are respectively matched with a first static contact plate and a second static contact of the first static contact, so that the direction of current flowing through the first static contact plate is opposite to the direction of current flowing through one moving contact arm matched with the first static contact plate when the switch is closed, the direction of current flowing through the second static contact is opposite to the direction of current flowing through the other moving contact arm matched with the second static contact, the double-breakpoint structure improves breaking capacity, and the breaking speed is accelerated by means of mutual repulsion between the moving contact and the static contact.

Description

Contact mechanism and switching device

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a switching electric appliance.

Background

A dc circuit breaker is a switching device capable of carrying and breaking a current under a normal circuit condition and also capable of carrying and breaking a current under an abnormal circuit condition within a predetermined time. The breaker breaks overload or short-circuit current, and is realized in an arc extinguishing chamber of the breaker. When fault current occurs in the circuit and the current value exceeds the set protection range of the circuit breaker, the tripping mechanism acts to quickly disconnect the moving contact and the fixed contact of the circuit breaker. At this time, the voltage formed between the moving and stationary contacts discharges the air dielectric, thereby generating a high-temperature arc. During the burning of the arc, the temperature of the air in the arc extinguishing device rises sharply, thereby accelerating the ionization of the air. On the other hand, the electric arc is divided into a plurality of short arcs by a plurality of arc isolating grid pieces under the pushing of the magnetic field and the fluid effect in the arc extinguish chamber, and the deionization effect of the electric arc is enhanced by the metal arc isolating pieces, so that the electric arc is gradually reduced until the electric arc is extinguished.

However, these current arc extinguishing means can only solve the arc generated by low voltage, and the arc extinguishing capability of a single-pole single chamber is slightly insufficient for the arc generated by high voltage.

In addition, the traditional single-pole single-breakpoint contact mechanism can meet the breaking requirement only under a certain working voltage, and when the working voltage is very high, the traditional single-pole single-breakpoint contact mechanism cannot meet the breaking requirement.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a double-breakpoint contact mechanism.

In order to achieve the purpose, the invention adopts the following technical scheme:

a contact mechanism comprises a Y-shaped moving contact and a fixed contact consisting of a first fixed contact and a second fixed contact, wherein the moving contact comprises two moving contact arms and a moving contact connecting arm; the first static contact is of a U-shaped structure capable of reversing current, and comprises a first static contact plate and a first static connection plate, wherein the first static contact plate is used for being matched with the moving contact, the first static connection plate is connected with the first static contact plate, one end, connected with the first static connection plate, of the first static contact plate is bent reversely, so that the end part of the other end of the first static contact plate is located on one side of the first static connection plate to form the U-shaped structure, and the direction of the current flowing through the first static connection plate is opposite to the direction of the current flowing through the first static contact plate; the two moving contact arms are respectively matched with a first static contact plate and a second static contact of the first static contact, so that the direction of current flowing through the first static contact plate is opposite to the direction of current flowing through one moving contact arm matched with the first static contact plate when the fixed contact is closed, and the direction of current flowing through the second static contact is opposite to the direction of current flowing through the other moving contact arm matched with the second static contact.

Preferably, the first fixed contact and the second fixed contact are arranged side by side at the ends matched with the moving contact, and are arranged corresponding to one ends of two moving contact arms of the moving contact; the other ends of the first static contact and the second static contact extend towards opposite directions respectively, and one end of the moving contact, which is provided with a moving contact connecting arm, extends towards the same direction as the second static contact.

Preferably, the first fixed contact, the second fixed contact and one end of the movable contact, which are matched with each other, are respectively provided with a fixed contact, the other ends of the first fixed contact and the second fixed contact respectively extend in opposite directions and are respectively and electrically connected with the second wiring terminal and the first wiring terminal at two ends of the circuit breaker, one of the second wiring terminal and the first wiring terminal is a wire inlet terminal, and the other one of the second wiring terminal and the first wiring terminal is a wire outlet terminal.

Preferably, one end of each of the two moving contact arms of the moving contact, which is matched with the first fixed contact and the second fixed contact, is provided with a moving contact, a moving contact connecting arm of the moving contact is used for being connected with the operating mechanism, and one end of the moving contact connecting arm, which is used for being connected with the operating mechanism, is provided with a moving contact insulating sleeve.

Preferably, the fixed contact terminal further comprises a fixed contact terminal insulating cover for separating the first fixed contact terminal from the second fixed contact terminal.

Preferably, the movable contact is composed of two Z-shaped movable contact pieces, each Z-shaped movable contact piece is composed of a first parallel section, a bending section and a second parallel section which are connected in sequence, the side faces of the first parallel sections of the two Z-shaped movable contact pieces are tightly attached to form a movable contact connecting arm, the bending sections of the two Z-shaped movable contact pieces bend and extend towards opposite directions to enable the second parallel sections of the two Z-shaped movable contact pieces to be arranged at intervals, the bending sections and the second parallel sections of the two Z-shaped movable contact pieces form two movable contact arms, one end of each second parallel section bends towards the side edge direction of one side, and the end part of each second parallel section is provided with a movable contact.

Preferably, a static contact is arranged at one end of the first static contact plate, and the first static contact plate is reversely bent beyond the excessive bending, so that the first static contact plate is inclined relative to the first static connection plate.

Preferably, the first fixed contact is integrally formed and formed by bending a sheet-shaped first contact plate, the front section of the first contact plate is reversely bent to form a first fixed contact plate, the middle section of the first contact plate forms a first fixed connecting plate, the tail section of the first contact plate forms a second terminal for wiring, and the second terminal and the first fixed connecting plate are bent to form a staggered step.

Preferably, the second static contact comprises a second static contact plate used for being matched with the moving contact, and a second static connection plate connected with the second static contact plate, one end of the second static contact plate is connected with the second static connection plate, and the other end of the second static contact plate extends towards the direction far away from the second static connection plate, so that the current direction flowing through the second static connection plate is the same as the current direction flowing through the second static contact plate, the end, connected with the second static contact plate, of the second static connection plate is bent upwards to be connected with the second static contact plate, and the end, provided with the static contact, of the second static contact plate, is bent downwards to enable the static contact to be inclined.

Preferably, the bottom of the static contact insulating cover is open, an insulating partition is arranged in the static contact insulating cover to partition the static contact insulating cover into two cavities, the two cavities are respectively a first cavity matched with the second static contact and a second cavity matched with the first static contact, a first inlet for the second static contact to extend into is formed in the position, corresponding to the first cavity, of the side wall at one end of the static contact insulating cover, a second inlet for the first static contact to extend into is formed in the position, corresponding to the second cavity, of the side wall at the other end of the static contact insulating cover, and a first mounting hole and a second mounting hole for the static contact of the second static contact and the static contact of the first static contact to extend out are respectively formed in the top of the static contact insulating cover, corresponding to the first cavity and the second cavity.

Preferably, the static contact insulating cover further covers a first static connecting plate of the first static contact, the first static connecting plate is connected with the second wiring terminal, an insulating side wall for isolating the second wiring terminal extends upwards from one end of the static contact insulating cover provided with the second inlet, and a U-shaped groove for installing an arc extinguish chamber is formed in the static contact insulating cover.

The invention also provides a switching device which comprises a contact system and an arc extinguishing system, wherein the contact system comprises at least one pole contact mechanism in the scheme.

Preferably, the arc extinguishing system includes the explosion chamber that corresponds the setting with contact mechanism, the explosion chamber is equipped with two separated arc extinguishing chamber.

Preferably, a plurality of arc extinguishing bars arranged in a stacked mode at intervals are arranged in the arc extinguishing chamber, two arc extinguishing gaps arranged at intervals are formed in one end of each arc extinguishing bar to form a W-shaped gap, and two arc extinguishing gaps of the plurality of arc extinguishing bars arranged in a stacked mode at intervals form two arc extinguishing cavities which are used for being matched with two movable contacts of the Y-shaped movable contact respectively.

Preferably, the arc extinguishing chamber shell of the arc extinguishing chamber is divided into two cavities by a partition plate, and each cavity is internally provided with a plurality of arc extinguishing grid pieces which are arranged in a spaced and stacked mode to form two arc extinguishing chambers; at least one permanent magnet is arranged on the two sides of each arc extinguishing chamber, and/or a permanent magnet is arranged on the top of each arc extinguishing chamber.

The contact mechanism adopts a double-breakpoint structure to improve the breaking capacity of high voltage, adopts a Y-shaped moving contact, can enable a U-shaped structure with reverse current and a first static contact plate with non-reverse current to achieve the effect of mutual repulsion of a moving contact and a static contact, and can accelerate the breaking speed of the circuit breaker by means of the mutual repulsion between the moving contact and the static contact when the circuit breaker is broken when the circuit breaker is subjected to fault current breaking, thereby improving the breaking capacity of the circuit breaker.

In addition, the contact mechanism is provided with a static contact insulating cover for separating the first static contact from the second static contact, so that the safety is improved.

The switching electric appliance of the invention greatly improves the high-voltage breaking arc extinguishing capability of the circuit breaker based on the contact mechanism and the single-pole double-cavity arc extinguishing chamber.

Drawings

Figure 1 is a schematic diagram of the structure of an embodiment of the circuit breaker of the present invention;

FIG. 2 is a schematic structural view of an embodiment of the contact system of the present invention;

FIG. 3 is a schematic view of the arc extinguishing chamber and the movable contact of the present invention;

fig. 4 is a schematic layout diagram of an embodiment of a first stationary contact and a second stationary contact according to the present invention;

fig. 5 is a schematic structural view of a static contact insulating cover of the invention;

fig. 6 is an assembly view of the first stationary contact, the second stationary contact and the stationary contact insulating cover according to the present invention;

fig. 7 is a schematic current flow diagram illustrating the cooperation of the first fixed contact and the movable contact according to the present invention;

fig. 8 is a schematic current flow diagram of the second stationary contact and the movable contact according to the present invention;

FIGS. 9-10 are exploded views of an arc chute of the present invention;

figure 11 is a schematic view of another angle of the arc chute housing of the present invention;

figure 12 is a schematic view of another angle of the arc chute frame of the present invention.

Detailed Description

The following description will further describe a specific embodiment of a contact system and an arc extinguishing system according to the present invention with reference to the embodiments shown in the drawings. A contact system and an arc extinguishing system of the present invention are not limited to the description of the following embodiments.

As shown in fig. 1-3, an embodiment of a circuit breaker includes a handle 11, an operating mechanism 12, a contact system, an arc extinguishing system, a trip system 15, a first terminal 16, and a second terminal 17. The contact system comprises at least one contact mechanism, each contact mechanism comprises a group of moving contacts 2 and static contacts which are matched with each other, a handle 11 is connected with an operating mechanism 12, the moving contacts 2 are connected with the operating mechanism 12 through contact supports 13, the moving contacts 2 and the static contacts are arranged oppositely, the handle 11 drives the moving contacts 2 to move to be in contact with and separated from the static contacts through the operating mechanism 12 to realize the switching-on and switching-off of the circuit breaker, an arc extinguishing system is arranged opposite to the moving contacts 2 and the static contacts and is used for extinguishing electric arcs when the moving contacts and the static contacts are separated, and a tripping system 15 acts to drive the operating mechanism 12 to trip when a fault occurs so as to enable the circuit breaker to be switched off. The circuit breaker shown in the figures comprises a two-pole contact mechanism, although the circuit breaker may be provided with only a single-pole contact mechanism, or with three, four or more poles, as desired. The conventional trip system 15 is a thermal trip including a bimetallic strip for overload protection and an instantaneous trip including an electromagnetic mechanism for short-circuit protection, and the trip system 15 is a trip system 15 integrating the thermal trip and the instantaneous trip in the drawing, which is prior art in the field and will not be described in detail. The switching device of the invention is implemented by a circuit breaker, but the improved arc-extinguishing chamber and contact mechanism of the invention are also applicable to other types of switching devices.

As shown in fig. 2-8, in an improvement point of the present invention, each pole of the contact mechanism includes a Y-shaped moving contact 2 and a stationary contact composed of a first stationary contact 4 and a second stationary contact 3, and one end of the Y-shaped moving contact 2 is disposed at an interval and is respectively used for cooperating with the first stationary contact 4 and the second stationary contact 3 to form a single-pole double-breakpoint contact mechanism, which can be applied to an ac/dc system.

The moving contact 2 comprises two moving contact arms 21 and a moving contact connecting arm 22, one end of each of the two moving contact arms 21 is connected with one end of the moving contact connecting arm 22, and the other ends of the two moving contact arms 21 are arranged at intervals to form a Y-shaped moving contact 2. The two moving contact arms 21 are respectively matched with the first fixed contact 4 and the second fixed contact 3, when one ends of the two moving contact arms 21 are respectively contacted with the first fixed contact 4 and the second fixed contact 3, the contact mechanism is closed to conduct a power supply, and when one ends of the two moving contact arms 21 are respectively separated from the first fixed contact 4 and the second fixed contact 3, the contact mechanism is disconnected to disconnect the power supply.

The first fixed contact 4 is a U-shaped structure capable of reversing current, and the second fixed contact 3 is a flat plate structure not reversing current. The first static contact 4 includes a first static contact plate 41 for cooperating with the moving contact 2, and a first static connection plate 42 connected to the first static contact plate 41, wherein one end of the first static contact plate 41 connected to the first static connection plate 42 is bent in a reverse direction so that an end of the other end of the first static contact plate 41 is located on one side of the first static connection plate 42 to form a U-shaped structure, so that a current flowing through the first static connection plate 42 is opposite to a current flowing through the first static contact plate 41.

The two movable contact arms 21 are respectively matched with the first fixed contact plate 41 and the second fixed contact 3 of the first fixed contact 4, so that the direction of current flowing through the first fixed contact plate 41 is opposite to the direction of current flowing through one movable contact arm 21 matched with the first fixed contact plate 41 when the movable contact is closed, and the direction of current flowing through the second fixed contact 3 is opposite to the direction of current flowing through the other movable contact arm 21 matched with the second fixed contact 3.

The double-breakpoint contact mechanism provided by the invention adopts a double-breakpoint structure to improve the breaking capacity of high voltage, and simultaneously adopts a Y-shaped moving contact, so that a U-shaped structure with reverse current and a first static contact plate 41 with non-reverse current can be used for achieving the effect of mutual repulsion of moving contacts and static contacts, and the effect of mutual repulsion of the moving contacts and the static contacts can be achieved no matter whether the main loop current flows in from a first static contact 4, flows out from a second static contact 3 or flows in from the second static contact 3 and flows out from the first static contact 4, when the breaker encounters fault current breaking, the breaking speed of the breaker can be accelerated by means of the repulsive force between the moving contacts and the static contacts during breaker breaking, and the breaking capacity of the breaker is improved.

As shown in fig. 2-4, the first fixed contact 4 and the second fixed contact 3 are arranged side by side at one end of the movable contact 2, and are arranged corresponding to one end of two movable contact arms 21 of the movable contact 2; the other ends of the first fixed contact 4 and the second fixed contact 3 extend in opposite directions, and the end of the movable contact 2 provided with the movable contact connecting arm 22 extends in the same direction as the second fixed contact 3. Specifically, the first fixed contact 4, the second fixed contact 3 and the movable contact 2 are respectively provided with a fixed contact at one end, the other ends respectively extend in opposite directions and are respectively electrically connected with the second terminal 17 and the first terminal 16 at two ends of the circuit breaker, one of the second terminal 17 and the first terminal 16 is an incoming line end, the other one is an outgoing line end, and the two terminals can be interchanged, wherein the incoming line end is connected with a power supply, and the outgoing line end is usually connected with a load. Two moving contact arms 21 of the moving contact 2 are respectively and correspondingly provided with a moving contact, a moving contact connecting arm 22 of the moving contact 2 is connected with an operating mechanism, and the two moving contacts of the moving contact 2 are respectively matched with two static contacts of the first static contact 4 and the second static contact 3 under the driving of the operating mechanism, so that the opening and closing of the circuit breaker are realized.

As shown in fig. 2-3, the Y-shaped movable contact 2 includes two movable contact arms 21 and a movable contact connecting arm 22, one end of each of the two movable contact arms 21 is connected to one end of the movable contact connecting arm 22, the other ends of the two movable contact arms 21 are spaced apart and provided with movable contacts for cooperating with stationary contacts of the first stationary contact 4 and the second stationary contact 3, and the two movable contact arms 21 form a V-shape, a U-shape, or the like. Preferably, one end of the movable contact arm 21, which is matched with the fixed contact, is bent and extended towards one side close to the fixed contact, and the end part is provided with a movable contact. The other end of the moving contact connecting arm 22 is used for connecting with the contact support 13, and the moving contact connecting arm 22 is in an I-shaped linear structure. It should be noted that the Y-shaped structure of the movable contact 2 refers to a similar shape structure, and mainly means that two breaking points are formed at one end of the movable contact 2, which is matched with the fixed contact, and are respectively used for being matched with the first fixed contact 4 and the second fixed contact 3, two movable contact arms 21 can form a V-shaped or U-shaped or similar structure, the movable contact connecting arm 22 is an I-shaped linear structure, and can also be provided with a proper bend or bulge, which both belong to the protection scope of the present invention, and the two movable contact arms 21 in the present embodiment are closer to the U-shaped. The Y-shaped moving contact 2 may be an integrated structure, or may be formed by riveting or welding two moving contact arms 21 and one moving contact connecting arm 22.

Preferably, one end of the movable contact connecting arm 22 for connecting with the operating mechanism is provided with a movable contact insulating sleeve 23.

Specifically, the moving contact 2 of this embodiment comprises two Z type moving contact pieces, every Z type moving contact piece is by the first parallel section that connects gradually, buckling section and second parallel section constitute, the side of the first parallel section of two Z type moving contact pieces is hugged closely and is formed moving contact linking arm 22, the buckling section of two Z type moving contact pieces is buckled to opposite direction and is extended the second parallel section interval that makes two Z type moving contact pieces and set up, the buckling section and the second parallel section of two Z type moving contact pieces form two moving contact arms 21, second parallel section one end is buckled to one side direction and the tip is equipped with the moving contact. One end of the contact connecting arm 22 connected with the contact support 13 is provided with a movable contact insulating sleeve 23, and the movable contact insulating sleeve 23 wraps one end of the contact connecting arm 22.

The assembly method of the moving contact 2 of this embodiment is, be equipped with the moving contact installation cavity on the contact support 13, the moving contact installation cavity is inserted together to moving contact connecting arm 22 one end and moving contact insulating bush 23, and moving contact connecting arm 22 is fixed with contact support 13 through axis of rotation and spring, and the axis of rotation passes moving contact connecting arm 22 one end and moving contact insulating bush 23 and is connected with contact support 13, carries out elastic fixation in order to realize the overtravel to moving contact connecting arm 22 through the spring. The contact support 13 is a contact rotating shaft, a plurality of moving contact mounting cavities are radially arranged, a moving contact 2 of the multi-pole contact mechanism can be mounted, the moving contact 2 can rotate along with the contact support 13 to drive a moving contact at one end of the moving contact 2 to swing, and the moving contact 2 can also independently rotate around the rotating shaft to realize overtravel. As another embodiment, the movable contact 2 may also be mounted on a four/five-bar operating mechanism to rotate independently about a rotating shaft.

As shown in fig. 7, the first fixed contact 4 includes a first fixed contact plate 41 for cooperating with the movable contact 2, and a first fixed connection plate 42 connected to the first fixed contact plate 41, wherein one end of the first fixed contact plate 41 connected to the first fixed connection plate 42 is bent in a reverse direction, so that an end of the other end of the first fixed contact plate 41 is located on one side of the first fixed connection plate 42 to form a U-shaped structure, and a direction of a current flowing through the first fixed connection plate 42 is opposite to a direction of a current flowing through the first fixed contact plate 41. In the example of fig. 4 and 7, the first static contact plate 41 is folded back and then stacked at an interval above the first static connection plate 42, and the first static connection plate 42 is used for wiring electrical connection. In this embodiment, the first fixed contact 4 is integrally formed by bending a sheet-shaped first contact plate, a front section of the first contact plate is reversely bent to form a first fixed contact plate 41, a middle section of the first contact plate forms a first fixed connection plate 42, a tail section of the first contact plate forms a second terminal 17 for wiring, and a staggered step is formed by bending the second terminal 17 and the first fixed connection plate 42 so as to adapt to a wiring position. Of course, the first stationary connecting plate 42 may also be electrically connected to the second terminal 17 by a wire or other mechanism. Further, one end of the first static contact plate 41 is provided with a static contact, and the first static contact plate 41 is reversely bent by more than 180 degrees, so that the first static contact plate 41 is inclined relative to the first static connection plate 42, and the static contact is obliquely arranged to be matched with the moving contact on the moving contact 2.

As shown in fig. 8, the second fixed contact 3 includes a second fixed contact plate 31 for cooperating with the movable contact 2, and a second fixed connection plate 32 connected to the second fixed contact plate 31, one end of the second fixed contact plate 31 is connected to the second fixed connection plate 32, and the other end extends in a direction away from the second fixed connection plate 32, so that a current flowing through the second fixed connection plate 32 is in the same direction as a current flowing through the second fixed contact plate 31. In the example of fig. 3 and 8, the end of the second static connecting plate 32 connected to the second static contact plate 31 is bent upward to connect to the second static contact plate 31 to raise the second static contact plate 31, the end of the second static contact plate 31 provided with the static contact is bent downward so that the static contact is obliquely arranged to match with the moving contact on the moving contact 2, and the other end of the second static connecting plate 32 is used for connecting the wires and electrically connecting. In this embodiment, the other end of the second stationary connecting plate 32 is electrically connected to the trip system 15, and the trip system 15 is electrically connected to the first terminal 16. Of course, the second stationary connecting plate 32 may be directly connected to the trip system 15, or may be connected to the trip system 15 through a flexible conductor, and the other end of the second stationary connecting plate 32 may be electrically connected to the first terminal 16 directly or through another mechanism.

The novel contact system can achieve the effect that the moving contact and the static contact repel each other no matter the main loop current flows in from the second wiring terminal 17 and flows out from the first wiring terminal 16 of the circuit breaker or flows in from the first wiring terminal 16 of the circuit breaker and flows out from the second wiring terminal 17, and when the circuit breaker is subjected to fault current breaking, the breaking speed of the circuit breaker can be accelerated by means of the repulsive force between the moving contact and the static contact when the circuit breaker is broken, and the breaking capacity of the circuit breaker is improved.

As shown in fig. 7-8, when the second terminal 17 is used as a wire inlet end and the first terminal 16 is used as a wire outlet end, when the circuit breaker of the contact system of the present invention is used for closing a circuit, moving contacts on two moving contact arms 21 of the moving contact 2 are simultaneously contacted with two stationary contacts of the first stationary contact 4 and the second stationary contact 3, respectively, a main circuit current flows into the circuit breaker through the wire inlet end, a main circuit current in the circuit breaker reversely flows through the first stationary contact 4, and then flows in a forward direction through one moving contact arm 21 (the moving contact arm 21 on the left side in fig. 2) of the Y-shaped moving contact 2, and at this time, the first stationary contact 4 with the reverse current and the moving contact arm 21 on the left side with the forward current form an effect of mutual exclusion of the counter current (fig. 7); then, the main circuit current flows in a reverse direction through the other movable contact arm 21 (the right movable contact arm 21 in fig. 2) of the Y-shaped movable contact 2 and then flows in a forward direction through the second fixed contact 3, the right movable contact arm 21 with the current in the reverse direction and the flat-type fixed contact plate 3 with the current in the forward direction form an effect of mutual exclusion of the anisotropic current (fig. 8), and then the main circuit current flows in the tripping system through the second fixed contact 3, flows in the outlet terminal through the tripping system, and finally flows out of the circuit breaker. When the first terminal 16 is used as a wire inlet end and the second terminal 17 is used as a wire outlet end, the current directions of the first static contact 4 and one movable contact arm 21 (left side in fig. 2) matched with the first static contact are always opposite, and the current directions of the second static contact 3 and one movable contact arm 21 (right side in fig. 2) matched with the second static contact are always opposite, so that the effect of mutual repulsion of the currents in different directions can be formed, the breaking speed of the circuit breaker can be accelerated by means of the mutual repulsion force between the static and dynamic contacts during breaking of the circuit breaker, and the breaking capacity of the circuit breaker can be improved.

Preferably, a part of the second stationary contact 3 connected to the tripping system 14 is provided with a stationary contact insulating sleeve.

As a further improvement point of the present invention, as shown in fig. 2, each pole contact mechanism further includes a stationary contact insulating cover 6 for separating the first stationary contact 4 from the second stationary contact 3.

As shown in fig. 5-6, in a preferred embodiment of the static contact insulating cover 6, the static contact insulating cover 6 is a cover shell structure with an open bottom, and is configured to separate the first static contact 4 and the second static contact 3 from one end of the movable contact 2, an insulating partition 61 is disposed in the static contact insulating cover 6 to separate the static contact insulating cover 6 into two cavities, the two cavities are a first cavity matched with the second static contact 3 and a second cavity matched with the first static contact 4, a first inlet 62 for the second static contact 3 to extend into is disposed at a position of a side wall of one end of the static contact insulating cover 6 corresponding to the first cavity, a second inlet 63 for the first static contact 4 to extend into is disposed at a position of a side wall of the other end of the static contact insulating cover 6 corresponding to the second cavity, and a first mounting hole 64 and a second mounting hole 65 for the static contact of the second static contact 3 and a static contact of the first static contact 4 to extend out are disposed at a top of the static contact insulating cover 6 corresponding to the first cavity and the second cavity respectively . The fixed contact insulating cover 6 separates the first fixed contact 4 from the second fixed contact 3, so that the structure is compact, safe and reliable.

Preferably, as shown in fig. 2, 5 and 6, the stationary contact insulating cover 6 further covers the first stationary connecting plate 42 of the first stationary contact 4, and an end of the stationary contact insulating cover 6, which is provided with the second inlet 63, extends upward to form an insulating sidewall 66 for isolating the second terminal 17.

Preferably, as shown in fig. 1, the arc extinguishing chamber 5 of the arc extinguishing system is mounted on the stationary contact insulating cover 6. The arc extinguish chamber 5 is arranged on the static contact insulating cover 6 corresponding to the first static connecting plate 42 and covers the two static contacts on the first static contact 4 and the second static contact 3. The static contact insulating cover 6 is provided with a U-shaped groove for installing the arc extinguish chamber 5, the U-shaped groove for installing the arc extinguish chamber 5 is formed between the insulating side wall 66 and one end provided with the static contact, the arc extinguish chamber 5 is installed in the U-shaped groove and covers the two static contacts, and the inlet side of the arc extinguish chamber 5 faces the moving contact 2.

As a further improvement of the present invention, as shown in fig. 1 and 3, the arc extinguishing system includes an arc extinguishing chamber 5, the arc extinguishing chamber 5 is provided with two separated arc extinguishing chambers for respectively cooperating with moving contacts on two moving contact arms 21 of the Y-shaped moving contact 2, and the two moving contacts of the Y-shaped moving contact 2 respectively extend into the two arc extinguishing chambers to swing and respectively cooperate with stationary contacts of the first stationary contact 4 and the second stationary contact 3. When the breaker is opened, two moving contacts of the Y-shaped moving contact 2 are separated from the static contacts of the first static contact 4 and the second static contact 3, the effect of voltage-dividing arc-extinguishing at the same side of double breakpoints of a single-pole contact system is achieved, the arc-extinguishing chamber is suitable for arc-extinguishing of alternating-current and direct-current circuits, the bottom of the arc-extinguishing chamber 5 is opened, and the static contacts are assembled in a matched mode, so that two arc-extinguishing chambers of the arc-extinguishing chamber 5 are covered on the two static contacts of the static contacts. When the circuit breaker breaks the loop current, the two breakpoints of the contact mechanism at the same side of the single pole are respectively disconnected in the two arc extinguishing chambers in the arc extinguishing chamber, and when the circuit breaker is connected with the loop current, the two breakpoints of the contact mechanism at the same side of the single pole are respectively closed in the two arc extinguishing chambers in the arc extinguishing chamber. When the circuit breaker loop has fault current, the voltage-dividing arc extinction can be completed in the single-pole double-cavity arc extinction chamber. The arc extinguish chamber 5 of the invention can be matched with not only the contact mechanism of the invention, but also other single-pole double-breakpoint contact mechanisms, namely, a moving contact with two moving contacts and a static contact with two static contacts, for example, the first static contact of the static contact can not reverse the current, and the first static contact and the second static contact can be arranged side by side to form the static contact and the like. The breaker has increased a breakpoint in homopolar, has realized the partial pressure, has just so realized breaking the purpose of higher voltage in the monopole, and the two-chamber explosion chamber also accords with the requirement that direct current undercurrent divides the disconnected narrow arc way that needs.

According to one embodiment of the arc extinguish chamber 5, a plurality of arc extinguish grid plates which are arranged in a stacking mode at intervals are arranged in the arc extinguish chamber 5, two arc extinguish notches which are arranged at intervals are arranged at one end of each arc extinguish grid plate to form a W-shaped notch, and two arc extinguish notches of the plurality of arc extinguish grid plates which are arranged in the stacking mode at intervals form two arc extinguish chambers which are used for being matched with two movable contacts of a Y-shaped movable contact 2 respectively and can be suitable for alternating current and direct current circuits.

Referring to fig. 9-10, in a preferred embodiment of the arc-extinguishing chamber 5 of the present invention, the arc-extinguishing chamber housing of the arc-extinguishing chamber 5 is divided into two cavities by a partition plate 55, and each cavity is provided with a plurality of arc-extinguishing grid plates 53 stacked at intervals to form two arc-extinguishing chambers, which can be applied to ac/dc circuits. Preferably, at least one permanent magnet 54 is disposed on both sides of each arc-extinguishing chamber, suitable for arc extinction by a direct current circuit, and one or two or more permanent magnets 54 may be disposed on each side of each arc-extinguishing chamber as needed. Further, the top of the arc extinguish chamber housing is provided with two permanent magnets 54 corresponding to the two arc extinguish chambers, and in this embodiment, the top of the arc extinguish chamber housing is provided with two permanent magnets 54, and each permanent magnet 54 corresponds to one arc extinguish chamber. The permanent magnets on the two sides are used for increasing a magnetic field when the direct current is cut off, the magnetic field is formed by the permanent magnets, and the current is blown into the arc extinguish chamber. The top permanent magnet is used for absorbing the electric arc into the top arc-extinguishing grid plate by magnetizing the arc-extinguishing grid plate through the permanent magnet under the condition that the space is not enough after the volume is reduced, and the top permanent magnet is arranged for large-current breaking.

Preferably, permanent magnets 54 are arranged on two sides of each arc extinguishing chamber, the permanent magnets on two sides of the two arc extinguishing chambers are divided into two groups, and the polarity directions of the permanent magnets in each group are respectively N, S arranged in opposite and same directions, that is, if the upper part of the permanent magnet on the left side in each group of permanent magnets is N, and the lower part is S, the upper part of the permanent magnet on the right side is N, and the lower part is S; vice versa, if the permanent magnet on the left side is S above, the permanent magnet on the right side is S above. The permanent magnet is provided with a magnetic pole direction according to the left-hand rule, the four-finger direction is the current direction, and the magnetic field penetrates through the palm center to ensure that the electromagnetic force direction is the direction pointing to the arc extinguishing grid piece in the corresponding arc extinguishing cavity. The magnetic pole directions of the two groups of permanent magnets can be the same or different.

Preferably, two permanent magnets 54 on the top of the arc extinguishing chamber housing correspond to the two arc extinguishing chambers, respectively, and the magnetic poles of the two permanent magnets 54 are arranged in opposite directions.

As shown in fig. 9, each arc extinguishing chamber is provided with an arc extinguishing grid group including a plurality of stacked arc extinguishing grid pieces 53, each arc extinguishing grid piece 53 is made of a non-magnetic material, and one end of each arc extinguishing grid piece 53 is provided with an arc extinguishing gap. Preferably, each group of arc chute plates includes a plurality of differently sized arc chute plates 53. As shown in fig. 10, each arc-extinguishing grid group includes first arc-extinguishing grid pieces 536, second arc-extinguishing grid pieces 535, third arc-extinguishing grid pieces 534 and fourth arc-extinguishing grid pieces 533 with different sizes, each arc-extinguishing grid group is formed by sequentially stacking at least one first arc-extinguishing grid piece 536, at least one third arc-extinguishing grid piece 534, at least one second arc-extinguishing grid piece 535, a plurality of third arc-extinguishing grid pieces 534, at least one second arc-extinguishing grid piece 535, at least one third arc-extinguishing grid piece 534 and at least one fourth arc-extinguishing grid piece 533 from top to bottom, the first arc-extinguishing grid piece 536 can block an arc, the rest arc-extinguishing grid pieces can be divided to extinguish the arc, and the thickness of the fourth arc-extinguishing grid piece 533 is greater than that of the other arc-extinguishing grid pieces, so that the arc is prevented from being melted and evaporated by the bottom of the arc-collecting chamber. Further, an arc striking lug bent downward is arranged in the arc extinguishing gap of the first arc extinguishing grid piece 536, and the length of the third arc extinguishing grid piece 534 and the depth of the arc extinguishing gap are greater than the length of the second arc extinguishing grid piece 535 and the depth of the arc extinguishing gap. As a deterioration, it is obvious that the structure of a plurality of arc chute pieces can be the same.

Preferably, the arc extinguishing gaps of the arc extinguishing grid pieces 53 are in a V shape or a U shape. In this embodiment, the arc-extinguishing gaps of the arc-extinguishing grid plates 53 are U-shaped, and the bottom of the U-shaped arc-extinguishing gaps of the second arc-extinguishing grid plate 535 and the third arc-extinguishing grid plate 534 are further provided with a communicating notch to form an arc-extinguishing gap similar to a Y-shape. The U-shaped arc-extinguishing gap of the first arc-extinguishing grid 536 is provided with an arc-striking lug therein.

Preferably, the arc extinguishing chamber housing and the partition plate 55 may be integrally formed to form two cavities, and a plurality of grid clamping grooves for mounting the arc extinguishing grid 53 and a magnet mounting groove for mounting the permanent magnet 54 are formed in the side walls of the two sides of the cavity. The arc extinguish chamber shell can also be formed by assembling.

As shown in fig. 9 to 10, the arc chute housing of the arc chute 5 comprises an arc chute cover 51 and an arc chute frame 52, and the arc chute cover 51 and the arc chute frame 52 are assembled to form the arc chute housing.

The arc extinguishing chamber frame 52 comprises a first outer side wall 521, a middle side wall 522 and a second outer side wall 523 which are vertically arranged in parallel at intervals in sequence, and further comprises a top wall 524 arranged on the tops of the first outer side wall 521, the middle side wall 522 and the second outer side wall 523; arc extinguishing chamber frame 52 one side opening is for facing the entrance side of moving contact 2, and the opposite side opening is for the assembly side with arc extinguishing chamber cover 51 assembly, arc extinguishing chamber cover 51 includes two cover lateral walls 511 that vertical interval set up, the cover backplate 513 of being connected with two cover lateral walls 511 one side, sets up the cover upper cover 512 at two cover lateral walls 511 and cover backplate 513 tops, arc extinguishing chamber frame 52's assembly side is connected with arc extinguishing chamber cover 51, makes two cover lateral walls 511 of arc extinguishing chamber cover 51 and arc extinguishing chamber frame 52's first lateral wall 521 and second lateral wall 523 butt joint, and arc extinguishing chamber cover 51 covers upper cover 512 and arc extinguishing chamber frame 52 roof 524 butt joint and forms the arc extinguishing chamber casing, and division board 55 separates into two cavitys with the arc extinguishing chamber casing.

On the inlet side of the arc extinguishing chamber frame 52, the first outer side wall 521, the middle side wall 522 and the second outer side wall 523 are provided with magnet installation grooves 525 for installing the permanent magnets 54, both side walls of the middle side wall 522 are provided with the magnet installation grooves 525, the permanent magnets 54 are installed in the magnet installation grooves 525, and the magnet installation grooves 525 are sealed by the baffle 540. The magnet mounting groove 525 is a square groove matched with the permanent magnet 54, and the plurality of baffle plates 540 are respectively clamped with the arc extinguishing chamber frame 52.

On the assembly side of the arc chute frame 52, the side wall between the first outer side wall 521 and the middle side wall 522, and the side wall between the middle side wall 522 and the second outer side wall 523 are provided with a plurality of grid front slots 526 for installing arc-extinguishing grids; the assembly side of the partition plate 55 and the middle side wall 522 is connected and protruded outside the arc extinguishing chamber frame 52; two magnet mounting grooves 525 for mounting the permanent magnets 54 are provided on the top wall 524, the permanent magnets 54 are mounted in the magnet mounting grooves 525, and the permanent magnets 54 on the top wall 524 are closed by the arc chute cover 51 at the cover upper cover 512.

The middle of the cover back plate 513 is provided with a partition plate clamping groove 51 for fixing the partition plate 55, and the inner side walls of the two cover side walls 511 are provided with a plurality of grid sheet rear clamping grooves 516 for mounting arc extinguishing grid sheets 53.

Preferably, exhaust barrier net structure 518 is provided on the cage back 513. Preferably, exhaust barrier net structure 518 is disposed on an upper side of enclosure back 513 adjacent enclosure sidewall 511, and exhaust barrier net structure 518 includes a plurality of small exhaust holes arranged in an array. Of course, the cage back 513 may be provided with only a few large exhaust holes.

Preferably, the cover top 512 protrudes toward the arc chute frame 52 to form a pressing plate, and the pressing plate seals the permanent magnet 54 on the top wall 524 of the arc chute frame 52 after the arc chute cover 51 is assembled with the arc chute frame 52.

Arc extinguishing chamber cover 51 and arc extinguishing chamber frame 52 buckle installation are equipped with a plurality of first buckles 517 at arc extinguishing chamber cover 51, arc extinguishing chamber frame 52 is last to be equipped with a plurality of and first buckle 517 complex first buckle groove 52.

The assembly method of the arc-extinguishing chamber 5 is that the front ends of the first group of a plurality of arc-extinguishing grids 52 which are arranged at intervals and are provided with arc-extinguishing gaps are inserted into the grid front clamping grooves 526 between the first outer side wall 521 and the middle side wall 522 of the arc-extinguishing chamber frame 52 in parallel, and the front ends of the second group of a plurality of arc-extinguishing grids 52 which are arranged at intervals and are provided with arc-extinguishing gaps are inserted into the grid front clamping grooves 526 between the middle side wall 522 and the second outer side wall 523 in parallel; the two permanent magnets 54 are mounted on the magnet mounting grooves 525 of the first outer side wall 521 and the middle side wall 522, the two permanent magnets 54 are mounted on the magnet mounting grooves 525 of the middle side wall 522 and the second outer side wall 523, and the magnet mounting grooves 525 are sealed by the baffle 540; the two permanent magnets 54 are arranged at the top of the arc extinguishing chamber frame 52, the arc extinguishing chamber cover 51 is clamped with the arc extinguishing chamber frame 52 from the assembling side of the arc extinguishing chamber frame 52, the first clamp 517 is clamped into the first clamp slot 52, the partition plate 55 is clamped into the partition plate clamp slot 51, the rear ends of the two groups of arc extinguishing grid pieces 52 are clamped into the grid piece rear clamp slot 516 of the arc extinguishing chamber cover 51, two cover side walls 511 of the arc extinguishing chamber cover 51 are butted with a first outer side wall 521 and a second outer side wall 523 of the arc extinguishing chamber frame 52, the cover upper cover 512 of the arc extinguishing chamber cover 51 is butted with the top wall 524 of the arc extinguishing chamber frame 52 to form an arc extinguishing chamber shell, the partition plate 55 divides the arc extinguishing chamber shell into two cavities, the convex pressing plate of the cover upper cover 512 seals the magnet installing slot 52 at the top of the arc extinguishing chamber frame 52, and the first outer side wall 521, the cavity surrounded by the corresponding cover side wall 511, the middle side wall 522 and the partition plate 55 and the first group of the multiple arc extinguishing grid pieces 52 form an arc extinguishing chamber; the second outer side wall 523, the corresponding other cover side wall 511 and the middle side wall 522 form a cavity surrounded by the second group of arc extinguishing grid pieces 52 to form another arc extinguishing cavity; the arc extinguish chamber 5 of the embodiment is convenient to assemble and compact and reliable in structure.

When circuit breaker return circuit fault current appears, two breakpoints of the contact mechanism of monopole homonymy break off respectively in two arc extinguishing chambeies in the explosion chamber, can accomplish the partial pressure arc extinguishing in monopole double-chamber arc extinguishing chamber, and electric arc is separated into a plurality of short arcs by a plurality of arc extinguishing bars piece under the promotion of the magnetic field of arc in the explosion chamber and fluid effect, relies on the deionization effect of metal arc separation piece intensive electric arc, makes electric arc diminish gradually, until extinguishing. Therefore, the high-voltage arc extinguishing capability of the direct current circuit breaker is improved. The arc extinguishing chamber can be used for an alternating current circuit breaker after the permanent magnet is removed.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (10)

1. A contact mechanism, characterized by: comprises a Y-shaped moving contact (2) and a static contact consisting of a first static contact (4) and a second static contact (3),

the moving contact (2) comprises two moving contact arms (21) and a moving contact connecting arm (22), one end of each of the two moving contact arms (21) is connected with one end of the moving contact connecting arm (22), and the other ends of the two moving contact arms (21) are arranged at intervals to form a Y-shaped moving contact (2);

the first static contact (4) is of a U-shaped structure capable of reversing current, and comprises a first static contact plate (41) matched with the moving contact (2) and a first static connection plate (42) connected with the first static contact plate (41), wherein one end, connected with the first static connection plate (42), of the first static contact plate (41) is reversely bent, so that the end part of the other end of the first static contact plate (41) is located on one side of the first static connection plate (42) to form the U-shaped structure, and the direction of the current flowing through the first static connection plate (42) is opposite to the direction of the current flowing through the first static contact plate (41);

the two movable contact arms (21) are respectively matched with a first static contact plate (41) and a second static contact (3) of the first static contact (4), so that the direction of current flowing through the first static contact plate (41) is opposite to the direction of current flowing through one movable contact arm (21) matched with the first static contact plate (41) when the movable contact is closed, and the direction of current flowing through the second static contact (3) is opposite to the direction of current flowing through the other movable contact arm (21) matched with the second static contact (3).

2. The contact mechanism of claim 1, wherein: the first fixed contact (4) and the second fixed contact (3) are arranged side by side at one end matched with the moving contact (2) and are arranged corresponding to one ends of two moving contact arms (21) of the moving contact (2); the other ends of the first fixed contact (4) and the second fixed contact (3) extend in opposite directions, and one end of the movable contact (2) provided with a movable contact connecting arm (22) extends in the same direction as the second fixed contact (3).

3. The contact mechanism of claim 2, wherein: the first fixed contact (4), the second fixed contact (3) and the moving contact (2) are matched, one ends of the first fixed contact and the second fixed contact are respectively provided with a fixed contact, the other ends of the first fixed contact and the second fixed contact extend in opposite directions respectively and are electrically connected with a second wiring terminal (17) and a first wiring terminal (16) at two ends of the circuit breaker respectively, one of the second wiring terminal (17) and the first wiring terminal (16) is an incoming line terminal, and the other one of the second wiring terminal and the first wiring terminal is an outgoing line terminal.

4. A contact arrangement according to any of claims 1 to 3, wherein: one end of each of the two moving contact arms (21) of the moving contact (2) which is matched with the first fixed contact (4) and the second fixed contact (3) is provided with a moving contact, a moving contact connecting arm (22) of the moving contact (2) is used for being connected with an operating mechanism, and one end of each of the moving contact connecting arms (22) which is used for being connected with the operating mechanism is provided with a moving contact insulating sleeve (23).

5. The contact mechanism of claim 1, wherein: the static contact structure further comprises a static contact insulating cover (6) used for separating the first static contact (4) from the second static contact (3).

6. The contact mechanism of claim 1, wherein: the moving contact (2) comprises two Z type moving contact pieces, every Z type moving contact piece is by the first parallel section that connects gradually, buckling section and second parallel section constitute, the side of the first parallel section of two Z type moving contact pieces is hugged closely and is formed moving contact linking arm (22), the buckling section of two Z type moving contact pieces is buckled to opposite direction and is extended the second parallel section interval that makes two Z type moving contact pieces and set up, the buckling section and the second parallel section of two Z type moving contact pieces form two moving contact arms (21), second parallel section one end is buckled to one side direction and the tip is equipped with the moving contact.

7. The contact mechanism of claim 1, wherein: and one end of the first static contact plate (41) is provided with a static contact, and the first static contact plate (41) is reversely bent by more than (180) degrees, so that the first static contact plate (41) inclines relative to the first static connection plate (42).

8. The contact mechanism of claim 1 or 7, wherein: the first static contact (4) is integrally formed and formed by bending a sheet-shaped first contact plate, the front section of the first contact plate is reversely bent to form a first static contact plate (41), the middle section of the first contact plate forms a first static connection plate (42), the tail section of the first contact plate forms a second wiring end (17) for wiring, and a staggered step is formed by bending the second wiring end (17) and the first static connection plate (42).

9. The contact mechanism of claim 1, wherein: the second static contact (3) comprises a second static contact plate (31) matched with the moving contact (2) and a second static connection plate (32) connected with the second static contact plate (31), one end of the second static contact plate (31) is connected with the second static connection plate (32), the other end of the second static contact plate extends in the direction far away from the second static connection plate (32), the direction of current flowing through the second static connection plate (32) is the same as the direction of current flowing through the second static contact plate (31), one end, connected with the second static contact plate (31), of the second static connection plate (32) is bent upwards to be connected with the second static contact plate (31), and one end, provided with a static contact, of the second static contact plate (31) is bent downwards to enable the static contact to be obliquely arranged.

10. The utility model provides a switching apparatus, includes contact system and arc extinguishing system, its characterized in that: the contact system comprising at least one pole contact arrangement according to any of claims 1 to 11.

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