CN211208372U

CN211208372U - Reversible static contact

Info

Publication number: CN211208372U
Application number: CN201922122465.5U
Authority: CN
Inventors: 付居典; 郭德鑫; 王以盾; 江华华
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-08-07
Anticipated expiration: 2029-12-02

Abstract

The utility model provides a static contact can overturn, includes housing and link plate, be provided with the support of installation static contact in the housing, link plate and static contact flexible coupling, the support is equipped with the installation static contact and provides the mounting groove of guide effect for the motion of static contact, and the mounting groove is equipped with first connection structure and second connection structure, first connection structure is used for rotating with the static contact and is connected, and the static contact is equipped with the contact one end rotatable stretch out outside the mounting groove, and second connection structure installs the elastic component that is used for providing reset force for the static contact, the elastic component corresponds the middle part of static contact. The utility model discloses a static contact can overturn compares with traditional static contact that can overturn, and the elastic component of installing alone and make the mounting means comparatively simple and convenient, longer static contact make the electronic repulsion between movable contact and the static contact great, the better characteristics of current-limiting effect of circuit breaker.

Description

Reversible static contact

Technical Field

The invention relates to a low-voltage circuit breaker, in particular to a reversible static contact.

Background

In short-circuit breaking, the current limiting technology has been widely applied in the field of low-voltage circuit breakers, and is mainly divided into two categories in principle: the first type is to limit the current by increasing the internal resistance of the circuit breaker, and the second type is to limit the current by using the electric repulsion inside the circuit breaker. Currently, the first type is mainly used in circuit breakers with smaller rated current, and the second type is widely applied.

In the molded case circuit breaker, the technology which is most commonly used for current limiting by using a reversible static contact is the technology which utilizes the electric repulsion inside the circuit breaker. However, the existing reversible static contact has the following disadvantages: firstly, the structure is complex, the interior of the circuit breaker occupies more space, and the assembly is not facilitated; secondly, because the effective length between the reversible static contact and the movable contact parallel conductor is short, the electric repulsion generated under the same short circuit current is small, and the current limiting effect is poor.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the reversible static contact which is simple in structure and high in reliability.

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

the utility model provides a static contact can overturn, includes housing and link plate, be provided with the support of installation static contact in the housing, link plate and static contact flexible coupling, the support is equipped with the installation static contact and provides the mounting groove of guide effect for the motion of static contact, and the mounting groove is equipped with first connection structure and second connection structure, first connection structure is used for rotating with the static contact and is connected, and the static contact is equipped with the contact one end rotatable stretch out outside the mounting groove, and second connection structure installs the elastic component that is used for providing reset force for the static contact, the elastic component corresponds the middle part of static contact.

Furthermore, the mounting groove is a U-shaped groove-shaped mounting groove with two open ends, the end parts of the groove walls on the two sides of the mounting groove are bent outwards to form a mounting structure for mounting on the housing, two side walls in the middle of the mounting groove are symmetrically provided with first connecting structures serving as mounting static contacts, and the first connecting structures are connected with shaft holes at one ends, far away from the contacts, of the static contacts; two side walls in the middle of the mounting groove form symmetrical raised structures in the groove to serve as second connecting structures for mounting the elastic piece.

Furthermore, the mounting structure comprises a first mounting structure and a second mounting structure, the support comprises a T-shaped plate, the T-shaped plate is composed of two straight-line connected horizontal short arms and a vertical long arm vertically connected with the joint of the two horizontal short arms, first side walls are symmetrically arranged on two sides of the vertical long arm of the T-shaped plate, second side walls are symmetrically arranged at the end parts of the two horizontal short arms of the T-shaped plate, the first side walls and the second side walls jointly form a mounting groove on the T-shaped plate, and the first side walls and the second side walls are used as groove walls on two sides of the mounting groove; the edge of the first side wall is bent outwards to form a bulge serving as a first mounting structure, and a first connecting structure is arranged on the first side wall; the middle part of the second side wall is provided with an opening which is opened upwards, the edge of the side wall on one side of the opening is bent outwards to form a second mounting structure, and the side wall on the other side of the opening is bent inwards symmetrically to form a second connecting structure.

Furthermore, the joint of two horizontal short arms of the T-shaped plate is provided with a screw hole for mounting a bracket.

Furthermore, a notch is formed in the joint of the first side wall and the long arm of the T-shaped plate, so that the edge of the end portion of the long arm of the T-shaped plate protrudes to form a stop protrusion, a stop surface matched with the stop protrusion is arranged at one end, away from the contact, of the static contact, and connection surfaces for soft connection with the connecting plate are arranged on two sides of the stop surface.

Furthermore, a perforation in rotary connection is arranged at one end of the static contact, a contact is arranged at the other end of the static contact, and a reflecting plate capable of generating arc extinguishing gas is arranged at one end close to the contact.

Furthermore, the housing is in a right triangle shape and comprises two housing side plates which are oppositely arranged, the support is located at one straight edge of the housing, the static contact is rotatably installed on the support and corresponds to one inclined edge of the housing in an inclined mode, the arc extinguish chamber is installed on the other straight edge of the housing, the connecting plate extends into the housing from the straight edge where the arc extinguish chamber is arranged, and the housing side plates are provided with a first assembling groove and a second assembling groove which are matched with the first installing structure and the second installing structure respectively.

Furthermore, a connecting clamping groove of a limiting connecting plate is arranged at the right angle of the right-angled triangle housing; the first connecting structure is a mounting hole for mounting a connecting shaft, a through hole for mounting the connecting shaft is correspondingly arranged on the static contact in a matched manner, and a connecting groove in matched connection with the connecting shaft is also arranged on the side wall of the housing side plate;

the arc extinguishing chamber is internally provided with a plurality of arc extinguishing grid pieces in a stacked mode, one side, close to the rotating shaft of the static contact, of each arc extinguishing grid piece is provided with an avoiding notch for avoiding the movement of the moving contact, one end, close to the rotating shaft of the static contact, of the inclined edge of the housing is sealed, and one end, close to the arc extinguishing grid pieces, of the inclined edge of the housing is provided with a notch for avoiding the.

Furthermore, the connecting plate is arranged below the bracket, and an avoiding groove correspondingly connected with the mounting groove is arranged on one side of the connecting plate close to the end of the static contact provided with the contact; the whole connecting plate is Z-shaped, an avoidance groove with an opening facing the static contact is arranged in the middle of the connecting plate, and the avoidance groove corresponds to the mounting groove and is symmetrically arranged below the support with two groove walls of the avoidance groove.

Further, the elastic component is a torsion spring with two elastic arms, the two ends of the middle part of the torsion spring are sleeved on the second connecting structure, one elastic arm of the torsion spring is abutted against the bracket, and the other elastic arm is abutted against the static contact.

Furthermore, the connecting plate and the static contact are integrally in a V shape, and when the moving contact is contacted and closed with the static contact, the moving contact, the static contact and the connecting plate are in a Z shape.

Compared with the installation mode that the elastic part providing reset force for the static contact and the static contact are coaxial, the installation mode that the elastic part is independently installed on the bracket is simpler to operate; meanwhile, one end of the static contact penetrates out of the installation groove, compared with a traditional reversible static contact, the length of the static contact is not limited by the length of the installation groove, the elastic part for providing the reset force acts on the middle part of the static contact, the distance from the rotatably installed part of the static contact to the contact is larger, the effective length between parallel conductors of the static contact is larger, under the same short-circuit current, the electric repulsion force between the movable contact and the static contact is larger, and the current limiting effect of the circuit breaker is better.

In addition, the bracket for mounting the static contact and the elastic piece is inwards bent to form a first connecting structure on the side wall of the bracket, is outwards bent to form a second connecting structure, and is provided with a first mounting structure and a second mounting structure which are connected with the housing, so that the structural characteristics of related parts are fully utilized, and the bracket does not occupy too much space inside the circuit breaker during assembly. The support adopts T shape structure, and its two short arms and elastic component cooperation set up, make the static contact obtain more space in the support in the motion process, have further saved the inside shared space of static contact in the circuit breaker.

Drawings

Fig. 1 is a schematic structural view of a reversible static contact according to the present invention;

fig. 2 is a schematic view of an internal structure of a reversible static contact according to the present invention;

fig. 3 is a schematic combination diagram of a bracket, a fixed contact and a connecting plate of a reversible fixed contact according to the present invention;

fig. 4 is a schematic structural view of a holder with a reversible fixed contact according to the present invention;

fig. 5 is a schematic view of a static contact structure of a reversible static contact according to the present invention;

fig. 6 is a schematic view of a housing structure of a reversible static contact according to the present invention;

fig. 7 is a schematic structural view of a reversible stationary contact in a circuit breaker according to the present invention;

fig. 8 is a schematic view of a reversible fixed contact and a movable contact of the present invention;

fig. 9 is a schematic view of an elastic member of a reversible static contact according to the present invention.

Detailed Description

The following describes a specific embodiment of a reversible static contact according to the present invention with reference to the embodiments shown in fig. 1 to 9. A reversible stationary contact of the present invention is not limited to the description of the following embodiments.

The utility model provides a static contact can overturn, includes housing 1 and link plate 2, be provided with the support 3 of installation static contact 4 in the housing 1, link plate 2 and static contact 4 flexible coupling, support 3 is equipped with installation static contact 4 and provides the mounting groove 31 of guide effect for the motion of static contact 4, and mounting groove 31 is equipped with first connection structure 34 and second connection structure 37, first connection structure 34 is used for rotating with static contact 4 and is connected, and the one end that static contact 4 was equipped with contact 41 is rotatable outside stretching out mounting groove 31, and second connection structure 37 is installed and is used for providing the elastic component 5 of restoring force for static contact 4, elastic component 5 corresponds the middle part of static contact 4.

Compared with the installation mode that the elastic part 5 providing the reset force for the static contact 4 is coaxial with the static contact 4, the installation mode that the elastic part 5 is independently installed on the bracket 3 is simpler to operate; meanwhile, one end of the static contact 4 penetrates out of the installation groove 31, compared with a traditional reversible static contact, the length of the static contact 4 is not limited by the length of the installation groove 31, the elastic piece 5 providing the reset force acts on the middle part of the static contact 4, the distance from the rotatably installed part of the static contact 4 to the contact 41 is larger, the effective length between the parallel conductors of the static contact 4 is larger, under the same short-circuit current, the electric repulsion between the movable contact and the static contact 4 is larger, and the current limiting effect of the circuit breaker is better.

As shown in fig. 1-3, a reversible static contact includes a housing 1 and a connecting plate 2, a bracket 3 for mounting a static contact 4 is disposed in the housing 1, the connecting plate 2 is flexibly connected to the static contact 4, the bracket 3 is provided with a mounting groove 31 for mounting the static contact 4 and providing a guiding effect for a movement of the static contact 4, two ends of the mounting groove 31 are provided with mounting structures for mounting on the housing 1, the mounting groove 31 is provided with a first connecting structure 34 and a second connecting structure 37, the first connecting structure 34 is used for being rotatably connected to the static contact 4, one end of the static contact 4 provided with a contact 41 is rotatably extended out of the mounting groove 31, the second connecting structure 37 is provided with an elastic member 5 for providing a restoring force for the static contact 4, and the elastic member 5 corresponds to a middle portion of the; the connecting plate 2 is arranged at one end, close to the static contact 4, of the connecting plate, the contact 41 is arranged at one end, the connecting plate 2 is arranged below the bracket 3, an avoiding groove 21 for avoiding the motion of the static contact 4 is arranged at one side, close to the contact 41, of the connecting plate 2, and the avoiding groove 21 is correspondingly connected with the mounting groove 31; preferably, the connecting plate 2 is arranged to be overall Z-shaped, an avoiding groove 21 with an opening facing the static contact 4 is arranged in the middle of the connecting plate, the avoiding groove 21 corresponds to the mounting groove 31, and two groove walls of the avoiding groove 21 are symmetrically located below the bracket 3. Because the length between the rotating connecting part of the static contact 4 and the contact 41 of the static contact 4 represents the effective length between the parallel conductors of the turnable static contact, the larger the length is, the larger the electric repulsion between the movable contact and the static contact 4 is under the same short-circuit current, and the better the current limiting effect of the circuit breaker is, the avoidance groove 21 for avoiding the static contact 4 is arranged on the Z-shaped linkage plate 2, so that the movement of one end of the static contact 4 close to the linkage plate 2 is not limited, the movement space of the static contact 4 is prolonged, the effective length between the parallel conductors of the turnable static contact can be further prolonged, the electric repulsion between the movable contact and the turnable static contact 4 can be increased, and the current limiting effect of the circuit.

Preferably, the bracket 3 is formed with an installation groove 31 with a U-shaped groove shape as a whole, two ends of the installation groove 31 are open, and the end parts of the groove walls at two sides of the installation groove 31 are bent outwards to form an installation structure for installing in the housing 1, the first connecting structures 34 are arranged on the two side walls of the middle part of the mounting groove 31, the first connecting structures 34 are used for being rotatably connected with one end of the static contact 4 far away from the contact 41, preferably adopting a shaft hole connection, the first connecting structures 34 are mounting holes for mounting the connecting shaft 6, and similarly, correspondingly, the stationary contact 4 is provided with a through hole 42 for mounting the connecting shaft 6, although other types of first connecting means 34 enabling a rotatable connection of the stationary contact 4 may be used, for example, a protruding structure similar to a rotating shaft is protruded on the fixed contact 4, and the first connecting structure 34 is provided as an installation hole, but this structure is not as simple and convenient as a way of separately arranging the connecting shaft 6; the two sidewalls at the middle of the mounting groove 31 are symmetrically provided with inward protruding structures as the second connecting structures 37, and the second connecting structures 37 are provided with the elastic members 5 for providing the restoring force to the stationary contacts 4, although other forms of the second connecting structures 37 may also be applied.

As shown in fig. 3 and 4, the mounting structure preferably includes a first mounting structure 35 and a second mounting structure 38, the bracket 3 includes a T-shaped plate, the T-shaped plate is composed of two straight-line connected horizontal short arms and a vertical long arm vertically connected to the connection of the two horizontal short arms, the two sides of the vertical long arm of the T-shaped plate are symmetrically provided with first side walls 32, the ends of the two horizontal short arms of the T-shaped plate are symmetrically provided with second side walls 33, the first side walls 32 and the second side walls 33 jointly define a mounting groove 31 on the T-shaped plate, and the first side walls 32 and the second side walls 33 are both used as two side groove walls of the mounting groove 31; the first side wall 32 can be arranged on both sides of the whole long arm, or can be arranged only in the area close to the end part of the long arm as shown in the figure, so that the occupied space can be saved, and the installation effect can be realized; preferably, the edge of the first sidewall 32 is bent outward to form a protrusion as the first mounting structure 35, and the protrusion as the first mounting structure 35 is a rectangular protrusion with the same thickness as the first sidewall 32; the first side wall 32 is provided with a mounting hole as a first connecting structure 34; an opening 36 with an upward opening is formed in the middle of the second side wall 33, the edge of the side wall on one side of the opening 36 is bent outward to form a protrusion serving as a second mounting structure 38, the protrusion serving as the second mounting structure 38 is a rectangular protrusion with the same thickness as that of the second side wall 33, the second mounting structure 38 and the first mounting structure 35 may be the same or different in size, and the shape is not limited to a rectangle, and may be trapezoidal, circular or polygonal, and the like, although the thicknesses of the first side wall 32 and the second side wall may be the same, or may be set to be the same as shown in the figure; the side wall on the other side of the opening 36 is symmetrically bent inwards to form a second connecting structure 37, although the second mounting structure 38 and the second connecting structure 37 may also be protruding structures separately arranged on the second side wall 33, which increases the production cost of the bracket; preferably, screw holes 39 for mounting the bracket 3 are provided at the junction of the two horizontal short arms of the T-shaped plate, and the invention is mounted on the base 9 of the circuit breaker by mounting screws in the screw holes 39.

As shown in fig. 6, the housing 1 is approximately in the shape of a right triangle, and includes two housing side plates that are arranged oppositely, the bracket 3 is located at one straight edge of the housing 1, the static contact 4 is rotatably installed on the bracket 3 and is obliquely corresponding to one oblique edge of the housing 1, an arc extinguish chamber is installed on the other straight edge of the housing 1, the connecting plate 2 extends into the straight edge where the arc extinguish chamber is installed, the housing side plates are provided with a first assembling groove 11 and a second assembling groove 12 that are respectively matched with the first installing structure 35 and the second installing structure 38, and the second assembling groove 12 can be arranged to penetrate through the side wall of the housing 1 as shown in the figure; a connecting groove 13 and a connecting clamping groove 14 which are matched and connected with the connecting shaft 6 and the connecting plate 2 are also arranged in the housing 1, and the connecting clamping groove 14 is arranged at the right angle of the right-angled triangular housing 1; the arc extinguishing chamber is internally provided with a plurality of arc extinguishing grid pieces 8 in a stacked mode, one side, close to the rotating shaft of the static contact 4, of each arc extinguishing grid piece 8 is provided with an avoiding notch for avoiding the motion of the moving contact, one end, close to the rotating shaft of the static contact, of the inclined edge of the housing 1 is sealed, and one end, close to the arc extinguishing grid pieces 8, of the inclined edge is provided with a housing notch for avoiding the motion of.

As shown in fig. 3 and 4, preferably, a notch is formed at a connection position of the first sidewall 32 and the vertical long arm of the T-shaped plate, so that an end edge of the vertical long arm of the T-shaped plate protrudes to form a stop protrusion 3a, a stop surface 4a matched with the stop protrusion 3a is arranged at an end of the static contact 4 away from the contact 41, one end of the static contact 4 away from the contact 41 is bent toward the bracket 3, a sidewall of the static contact 4 close to the stop protrusion 3a serves as the stop surface 4a, and when the static contact 4 rotates around the connecting shaft 6 until the stop surface 4a contacts with the stop protrusion 3a, the rotation of the static contact 4 is stopped. Specifically, the two sides of the stop surface 4a are provided with connecting surfaces 4b for soft connection with the connecting plate 2, the connecting surfaces 4b are formed by two side walls adjacent to the stop surface 4a, the connecting surfaces 4b are connected with one end of a copper bar for soft connection, the other end of the copper bar is connected with the connecting plate 2, and other soft-connected elements can also be used in the invention.

As shown in fig. 3, a through hole 42 is provided at one end of the static contact 4 for rotational connection, the other end is provided with a contact 41, a reflecting plate 7 is provided at one end close to the contact 41, the reflecting plate 7 is fixed to the static contact 4 by a rivet, the reflecting plate 7 can generate arc extinguishing gas, and the gas expands with ambient air to generate gas pressure on the moving contact in a narrow space, so as to realize rapid breaking and current limiting; furthermore, the reflecting plate 7 can prevent the arc from burning the contact 41 of the stationary contact 4.

Specifically, the elastic member 5 is a torsion spring having two elastic arms, two ends of the middle portion of the torsion spring are sleeved on the second connecting structure 37, one elastic arm of the torsion spring abuts against the bracket 3, and the other elastic arm abuts against the static contact 4. The torsion spring preferably comprises two sections of torsion springs, two outer ends of the two sections of torsion springs are respectively abutted against the second side wall 33 on the short arm of the T-shaped support 3, a gap is reserved between the two inner ends of the two sections of torsion springs, and the respective elastic arms of the two sections of torsion springs are connected across the gap between the inner ends of the two sections of torsion springs to form the elastic arms for abutting against the static contact 4, so that when the static contact 4 is pressed against the elastic arms on the static contact 4, the static contact 4 can stretch into the gap between the two sections of torsion springs, so that the static contact 4 obtains more movement space inside the support 3, and the space occupied by the static contact 4 in the circuit breaker is saved. The other elastic arms of the two sections of torsion springs can also be connected together across a gap formed by the inner ends of the two sections of torsion springs and abut against the bracket 3 together, and of course, the other elastic arms can also be arranged separately and abut against the bracket 3 respectively as shown in fig. 9.

As shown in fig. 2, 7 and 8, an arc extinguishing chamber is further arranged in the housing 1, a plurality of arc extinguishing grid pieces 8 are stacked in the arc extinguishing chamber, an avoiding gap for avoiding the movement of the moving contact is arranged on one side of each arc extinguishing grid piece 8 close to the corresponding static contact 4, in fig. 7 and 8, the contact 41 of the corresponding static contact 4 is closed with the contact of the corresponding moving contact, the connecting plate 2 and the corresponding static contact 4 are integrally formed into a V shape after installation, and when the moving contact is closed in contact with the corresponding static contact 4, the moving contact, the corresponding static contact 4 and the connecting plate 2 are in a zigzag shape, so that after the moving contact and the corresponding static contact 4 are in contact conduction.

When the invention is assembled, the elastic element 4 needs to be installed on the second connecting structure 37, then the static contact 4 needs to be installed on the first connecting structure 34, and if necessary, the static contact 4 needs to be pressed by hand to ensure that the through hole 42 is aligned with an installation hole serving as the first connecting structure 34 on the bracket 3, the connecting shaft 6 penetrates through the through hole 42 and the first connecting structure 34 to bolt the static contact 4 and the bracket 3 together, and two ends of the connecting shaft 6 can be clamped into the connecting grooves 13 on the housing 1.

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

1. The utility model provides a static contact can overturn, includes housing (1) and connecting plate (2), be provided with support (3) of installation static contact (4) in housing (1), connecting plate (2) and static contact (4) flexible coupling, its characterized in that: the support (3) is provided with an installation groove (31) for installing the static contact (4) and providing a guiding effect for the movement of the static contact (4), the installation groove (31) is provided with a first connection structure (34) and a second connection structure (37), the first connection structure (34) is used for being rotatably connected with the static contact (4), one end, provided with the contact (41), of the static contact (4) can rotatably extend out of the installation groove (31), the second connection structure (37) is provided with an elastic piece (5) used for providing a reset force for the static contact (4), and the elastic piece (5) corresponds to the middle of the static contact (4).

2. The reversible stationary contact of claim 1, wherein: the mounting groove (31) is a U-shaped groove-shaped mounting groove (31) with two open ends, the end parts of the groove walls on the two sides of the mounting groove (31) are bent outwards to form a mounting structure for mounting on the housing (1), two side walls in the middle of the mounting groove (31) are symmetrically provided with first connecting structures (34) serving as mounting static contacts (4), and the first connecting structures (34) are connected with shaft holes at one ends, far away from the contacts (41), of the static contacts (4); two side walls in the middle of the mounting groove (31) form symmetrical protruding structures inwards to form a second connecting structure (37) for mounting the elastic piece (5).

3. A reversible stationary contact according to claim 2, characterized in that: the mounting structure comprises a first mounting structure (35) and a second mounting structure (38), the support (3) comprises a T-shaped plate, the T-shaped plate is composed of two straight-line connected horizontal short arms and a vertical long arm vertically connected with the joint of the two horizontal short arms, first side walls (32) are symmetrically arranged on two sides of the vertical long arm of the T-shaped plate, second side walls (33) are symmetrically arranged at the end parts of the two horizontal short arms of the T-shaped plate, the first side walls (32) and the second side walls (33) jointly enclose a mounting groove (31) on the T-shaped plate, and the first side walls (32) and the second side walls (33) are used as groove walls on two sides of the mounting groove (31); the edge of the first side wall (32) is bent outwards to form a bulge serving as a first mounting structure (35), and a first connecting structure (34) is arranged on the first side wall (32); an opening (36) with an upward opening is formed in the middle of the second side wall (33), the edge of the side wall on one side of the opening (36) is bent outwards to form a second mounting structure (38), and the side wall on the other side of the opening (36) is bent inwards symmetrically to form a second connecting structure (37).

4. A reversible stationary contact according to claim 3, characterized in that: and a screw hole (39) for mounting the bracket (3) is formed at the joint of the two horizontal short arms of the T-shaped plate.

5. A reversible stationary contact according to claim 3, characterized in that: the connecting part of the first side wall (32) and the long arm of the T-shaped plate is provided with a notch, so that the edge of the end part of the long arm of the T-shaped plate protrudes to form a stop protrusion (3a), one end, away from the contact (41), of the static contact (4) is provided with a stop surface (4a) matched with the stop protrusion (3a), and the two sides of the stop surface (4a) are provided with connecting surfaces (4b) for being in soft connection with the connecting plate (2).

6. The reversible stationary contact of claim 1, wherein: and one end of the static contact (4) is provided with a through hole (42) in rotary connection, the other end of the static contact is provided with a contact (41), and one end close to the contact (41) is provided with a reflecting plate (7) capable of generating arc extinguishing gas.

7. A reversible static contact according to claim 3, characterized in that the housing (1) is in a right triangle shape and comprises two housing side plates which are oppositely arranged, the bracket (3) is positioned at one straight edge of the housing (1), the static contact (4) is rotatably arranged on the bracket (3) and is obliquely corresponding to one oblique edge of the housing (1), the other straight edge of the housing (1) is provided with an arc extinguish chamber, the connecting plate (2) extends into the housing from the straight edge provided with the arc extinguish chamber, and the housing side plates are provided with a first assembling groove (11) and a second assembling groove (12) which are respectively matched with the first mounting structure (35) and the second mounting structure (38).

8. The reversible static contact as claimed in claim 7, wherein the right angle of the right-angled triangle housing (1) is provided with a connecting slot (14) of a limiting connection plate (2);

the first connecting structure (34) is a mounting hole for mounting the connecting shaft (6), a through hole (42) for mounting the connecting shaft (6) is correspondingly arranged on the static contact (4) in a matched manner, and a connecting groove (13) in matched connection with the connecting shaft (6) is further formed in the side wall of the housing side plate;

the arc extinguishing chamber is internally provided with a plurality of arc extinguishing grid pieces (8) in a stacked mode, one side, close to the rotating shaft of the static contact (4), of each arc extinguishing grid piece (8) is provided with an avoiding notch for avoiding the movement of the moving contact, one end, close to the rotating shaft of the static contact, of the housing (1) is sealed, and one end, close to the arc extinguishing grid pieces (8), of the bevel edge is provided with a housing notch for avoiding the movement of the moving contact.

9. The reversible stationary contact of claim 1, wherein: the connecting plate (2) is arranged below the bracket (3), and an avoiding groove (21) correspondingly connected with the mounting groove (31) is arranged on one side of one end, close to the static contact (4), of the end provided with the contact (41); the whole connecting plate (2) is Z-shaped, an avoiding groove (21) with an opening facing the static contact (4) is formed in the middle of the connecting plate, and the avoiding groove (21) corresponds to the mounting groove (31) and is located below the support (3) symmetrically with two groove walls of the avoiding groove (21).

10. The reversible stationary contact of claim 1, wherein: the elastic part (5) is a torsion spring with two elastic arms, the two ends of the middle part of the torsion spring are sleeved on the second connecting structure (37), one elastic arm of the torsion spring is abutted against the bracket (3), and the other elastic arm is abutted against the static contact (4).

11. The reversible stationary contact of claim 1, wherein: the connecting plate (2) and the static contact (4) are integrally in a V shape, and when the moving contact is contacted and closed with the static contact (4), the moving contact, the static contact (4) and the connecting plate (2) are in a Z shape.