Arc isolating mechanism of circuit breaker

Abstract

An arc-isolating mechanism of a circuit breaker includes a housing, an elastic sliding assembly and an arc-isolating assembly. When the moving contact rotates during opening and closing, the elastic sliding assembly cooperates with the arc-isolating assembly to perform telescopic movement along the housing direction; the elastic sliding assembly includes a transmission slider, a sliding shaft and an elastic member, and the arc-isolating assembly includes a displacement amplification mechanism and an arc-isolating member. When the circuit breaker is opened, the moving contact presses the displacement amplification mechanism in a direction perpendicular to the housing through the transmission slider, so that the displacement amplification mechanism performs a stretching movement along the housing direction, and the arc-isolating member extends between the moving contact and the static contact of the circuit breaker. When the circuit breaker is closed, the elastic member drives the transmission slider and the displacement amplification mechanism to perform a contraction movement along the housing direction through the sliding shaft, and the arc-isolating member moves out from between the moving contact and the static contact. The elastic sliding assembly and the arc-isolating assembly of the present invention cooperate to convert the pressing of the moving contact into a telescopic movement along the housing direction, which can realize active arc extinguishing and miniaturized design of the circuit breaker.

Description

Technical Field

[0001] The invention relates to the field of low-voltage circuit breakers, and in particular to an arc isolation mechanism of a circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can carry and interrupt current under normal circuit conditions, and can also carry or interrupt current under abnormal circuit conditions within a specified time. When a fault current appears in the main circuit, especially when the fault current exceeds the set protection range of the circuit breaker, as the moving and static contacts of the circuit breaker are quickly disconnected, the voltage between the moving contact and the static contact causes the air medium to discharge and generate a high-temperature arc.

[0003] The arc extinguishing capacity of existing circuit breakers is limited. Circuit breakers usually adopt passive arc extinguishing after the arc is completely generated and the energy is completely released. However, due to the huge energy during breaking, especially for high-voltage arcs, it is difficult to extinguish the arc by passive arc extinguishing. Long-term arcing can easily burn the contact mechanism of the circuit breaker, affecting the service life of the circuit breaker. In addition, in order to avoid interfering with the closing of the contact mechanism of the circuit breaker, the existing arc extinguishing structure usually adopts a rotating method to enter and exit between the moving contact and the static contact. Such a structure requires reserved movement space in the housing of the circuit breaker, which is not conducive to the miniaturization design of the circuit breaker. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an arc-isolating mechanism which has a simple structure, high reliability and can actively extinguish arcs.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An arc-isolating mechanism of a circuit breaker comprises a housing, and an elastic sliding assembly and an arc-isolating assembly mounted on the housing, wherein the elastic sliding assembly is used to cooperate with a moving contact of the circuit breaker, and when the moving contact is opened and closed, the elastic sliding assembly cooperates with the arc-isolating assembly to perform telescopic movement along the housing direction;

[0007] The elastic sliding assembly includes a transmission slider, a sliding shaft and an elastic member, one end of the transmission slider and the elastic member are connected to the sliding shaft, the arc isolation assembly includes a displacement amplification mechanism and an arc isolation member driven by the displacement amplification mechanism, one end of the displacement amplification mechanism is connected to the sliding shaft, when the circuit breaker is opened, the moving contact presses the displacement amplification mechanism in a direction perpendicular to the shell through the transmission slider, so that the displacement amplification mechanism performs a stretching movement in the direction of the shell, the displacement amplification mechanism stretches the elastic member through the sliding shaft, and the arc isolation member extends between the moving contact and the static contact of the circuit breaker, when the circuit breaker is closed, the elastic member drives the transmission slider and the displacement amplification mechanism to perform a contraction movement in the direction of the shell through the sliding shaft, and the arc isolation member moves out from between the moving contact and the static contact of the circuit breaker.

[0008] Furthermore, a mating portion is provided in the middle portion of the transmission slider. When the circuit breaker is opened, the rotating shaft of the moving contact can cooperate with the mating portion, so that the end of the transmission slider away from the sliding shaft rotates and presses the displacement amplification mechanism. When the circuit breaker is closed, the rotating shaft of the moving contact is released from the mating portion and the end of the transmission slider away from the sliding shaft is released from the press-fitting with the displacement amplification mechanism.

[0009] Furthermore, the displacement amplification mechanism can perform a stretching movement after being pressed. One end of the displacement amplification mechanism is slidably matched with the shell through a sliding shaft, and the other end of the displacement amplification mechanism is fixedly connected to the shell. When the moving contact is opened and rotated, the pressing of the moving contact causes the transmission slider to rotate around the sliding shaft, and the end of the transmission slider away from the sliding shaft presses the displacement amplification mechanism to stretch it. When the moving contact is closed and rotated, the moving contact releases the cooperation with the transmission slider, and the elastic member drives the displacement amplification mechanism to perform a contraction movement through the sliding shaft.

[0010] Furthermore, the displacement amplification mechanism is a triangular hinge type displacement amplification mechanism, which includes a plurality of connecting rods and a plurality of first connecting members and second connecting members connected end to end. The plurality of connecting rods are arranged in two rows at intervals and the connecting rods in the upper and lower rows are staggered relative to each other. The head end of the first connecting member is connected to a connecting rod in the lower row, the tail end of the first connecting member and the head end of the second connecting member are connected to the same connecting rod in the upper row, and the tail end of the second connecting member is connected to another connecting rod in the lower row.

[0011] Furthermore, a accommodating cavity is provided in the middle of the shell, and the elastic sliding component and the displacement amplification mechanism are installed in the accommodating cavity. A guide groove for slidingly cooperating with the sliding shaft is provided on the side wall of the accommodating cavity, and a limiting protrusion is provided on one side of the guide groove. The limiting protrusion is used to limit the sliding range of the transmission slider.

[0012] Furthermore, the shell is a groove-type structure with one side open, and the groove in the middle serves as a accommodating chamber. The side walls at one end of the accommodating chamber extend outward to form an extension wall, and the end portion of the other end of the accommodating chamber is open to avoid the arc isolation member. Guide grooves are provided on the two side walls of the accommodating chamber. The guide grooves are used to slide with the sliding shaft. The guide grooves are strip grooves parallel to the accommodating chamber, and a limiting protrusion is protruding from one side of the strip groove.

[0013] Furthermore, the transmission slider is a plate-like structure as a whole, and one side edge of the middle part of the transmission slider is bent and extended upward to form a mating portion for mating with the moving contact, and a notch is provided on the mating portion for the rotating shaft of the moving contact to extend into. The two sides of one end of the transmission slider are bent and extended downward to form two connecting arms, and connecting holes for assembling the sliding shaft are provided on the two connecting arms.

[0014] Furthermore, the arc isolation member is a plate-like structure, one end of the arc isolation member is connected to the displacement amplification mechanism, and a notch is provided in the middle of the other end of the arc isolation member so that the arc isolation member is Y-shaped as a whole.

[0015] Furthermore, the arc isolation assembly also includes an insulating cover assembled on the shell, and the insulating cover is arranged at an end opposite to the arc isolation member to insulate the transmission slider and the displacement amplification mechanism when the circuit breaker is closed.

[0016] Furthermore, the elastic sliding assembly also includes a fixed shaft, which is fixedly mounted on the housing, and the other end of the elastic member and the other end of the displacement amplification mechanism are connected to the fixed shaft.

[0017] An arc-isolating mechanism of a circuit breaker of the present invention, an elastic sliding component and an arc-isolating component cooperate together to convert the pressing of a moving contact perpendicular to the direction of a shell into a telescopic movement along the direction of the shell. This structure, which converts the direction of movement and cuts off the arc by telescopic movement, does not require additional rotation space while ensuring active arc cutting, reduces the space occupied by the arc-isolating mechanism inside the circuit breaker shell, and is beneficial to the miniaturized design of the circuit breaker.

[0018] In addition, with the cooperation of the elastic sliding component and the displacement amplification mechanism, the smaller displacement of the transmission slider is amplified into a larger displacement of the arc isolation member, which is beneficial to improving the effect of cutting off the arc.

[0019] In addition, a housing for mounting an elastic sliding assembly and a displacement amplification mechanism is provided on the shell, and a guide groove is provided on the side wall of the housing for the elastic sliding assembly and the displacement amplification mechanism to slide and perform telescopic movements, thereby further reducing the space occupied by the arc isolation mechanism inside the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an arc isolation mechanism of a circuit breaker of the present invention;

[0021] Figure 2 yes Figure 1 Schematic diagram of the decomposition of

[0022] Figure 3-4 It is a structural schematic diagram of an arc-isolating mechanism of a circuit breaker of the present invention when the circuit breaker is opened;

[0023] Figure 5-6 It is a structural schematic diagram of an arc isolation mechanism of a circuit breaker of the present invention when the circuit breaker is closed;

[0024] Figure 7 It is a structural schematic diagram of a displacement amplification mechanism in an arc isolation mechanism of a circuit breaker of the present invention;

[0025] Figure 8 The invention discloses a schematic diagram of a moving contact in an arc-isolating mechanism of a circuit breaker. DETAILED DESCRIPTION

[0026] The following is combined with Figures 1 to 8 The given embodiments further illustrate the specific implementation of the arc isolation mechanism of a circuit breaker of the present invention. The arc isolation mechanism of a circuit breaker of the present invention is not limited to the description of the following embodiments.

[0027] An arc-isolating mechanism of a circuit breaker comprises a housing 1 and an elastic sliding assembly 2 and an arc-isolating assembly 3 mounted on the housing 1, wherein the elastic sliding assembly 2 is used to cooperate with a moving contact 4 of the circuit breaker, and when the moving contact 4 is opened and closed, the elastic sliding assembly 2 cooperates with the arc-isolating assembly 3 to perform telescopic movement along the housing 1;

[0028] The elastic sliding assembly 2 includes a transmission slider 21, a sliding shaft 22 and an elastic member 24. One end of the transmission slider 21 and the elastic member 24 are connected to the sliding shaft 22. The arc isolation assembly 3 includes a displacement amplification mechanism 31 and an arc isolation member 32 driven by the displacement amplification mechanism 31. One end of the displacement amplification mechanism 31 is connected to the sliding shaft 22. When the circuit breaker is opened, the moving contact 4 presses the displacement amplification mechanism 31 in a direction perpendicular to the housing 1 through the transmission slider 21, so that the displacement amplification mechanism 31 is stretched in the direction of the housing 1. The displacement amplification mechanism 31 stretches the elastic member 24 through the sliding shaft 22, and the arc isolation member 32 extends between the moving contact 4 and the static contact 5 of the circuit breaker. When the circuit breaker is closed, the elastic member 24 drives the transmission slider 21 and the displacement amplification mechanism 31 to contract in the direction of the housing 1 through the sliding shaft 22, and the arc isolation member 32 moves out from between the moving contact 4 and the static contact 5 of the circuit breaker.

[0029] In an arc-isolating mechanism of a circuit breaker of the present invention, an elastic sliding component 2 and an arc-isolating component 3 cooperate to convert the pressing of a moving contact 4 in a direction perpendicular to a housing 1 into a telescopic movement along the housing 1. This structure, which cuts off the arc by converting the direction of movement and using a telescopic movement, does not require additional rotation space while ensuring active arc cutting, thereby reducing the space occupied by the arc-isolating mechanism inside the circuit breaker housing and facilitating the miniaturized design of the circuit breaker.

[0030] Combination Figure 1-8 An embodiment of an arc isolation mechanism is provided, wherein the arc isolation mechanism is arranged in a circuit breaker and cooperates with a moving contact 4 of the circuit breaker, wherein the arc isolation mechanism comprises a housing 1 and an elastic sliding assembly 2 and an arc isolation assembly 3 mounted on the housing 1, wherein the elastic sliding assembly 2 is used to cooperate with the moving contact 4, and when the moving contact 4 rotates to open or close the switch, the elastic sliding assembly 2 cooperates with the arc isolation assembly 3 to convert the pressing of the moving contact 4 along the vertical direction of the housing 1 into a telescopic movement along the direction of the housing 1.

[0031] The elastic sliding component 2 includes a transmission slider 21, a sliding shaft 22, a fixed shaft 23 and an elastic member 24, one end of the transmission slider 21 and the elastic member 24 are connected to the sliding shaft 22, and can slide on the housing 1 with the sliding shaft 22, the other end of the elastic member 24 is fixed to the housing 1 through the fixed shaft 23, the arc isolation component 3 includes a displacement amplification mechanism 31 and an arc isolation member 32, one end of the displacement amplification mechanism 31 is connected to the sliding shaft 22 to achieve a linkage connection with the transmission slider 21 and the elastic member 24, and the other end of the displacement amplification mechanism 31 is also fixedly installed on the housing 1 through the fixed shaft 23. When the circuit breaker is opened, the moving contact 4 presses the displacement amplification mechanism 31 in a direction perpendicular to the shell 1 through the transmission slider 21, so that the displacement amplification mechanism 31 is stretched in the direction of the shell 1, and the displacement amplification mechanism 31 stretches the elastic member 24 through the sliding shaft 22, and the arc-isolating member 32 extends between the moving contact 4 and the static contact 5 of the circuit breaker to cut off the arc. When the circuit breaker is closed, the elastic member 24 drives the transmission slider 21 and the displacement amplification mechanism 31 to retract in the direction of the shell 1 through the sliding shaft 22, and the arc-isolating member 32 moves out from between the moving contact 4 and the static contact 5 of the circuit breaker to avoid interfering with the closing of the circuit breaker.

[0032] Specifically, a matching portion 211 is provided in the middle of the transmission slider 21. When the circuit breaker is opened, the rotating shaft 41 of the moving contact 4 can cooperate with the matching portion 211 to press the transmission slider 21, so that the end of the transmission slider 21 away from the sliding shaft 22 rotates and presses the displacement amplification mechanism 31. The displacement amplification mechanism 31 can perform a stretching movement after being pressed. The pressing of the transmission slider 21 causes the displacement amplification mechanism 31 to be compressed and stretched, and the sliding shaft 22 drives the transmission slider 21 and the arc-isolating member 32 to move together. The arc-isolating member 32 extends between the moving contact 4 and the static contact 5 to cut off the arc, and at the same time the elastic member 24 is stretched to store energy; when the circuit breaker is closed, the rotating shaft 41 of the moving contact 4 is released from the matching portion 211, and the end of the transmission slider 21 away from the sliding shaft 22 is released from the pressing and fitting with the displacement amplification mechanism 31. The elastic member 24 releases energy and drives the displacement amplification mechanism 31 to perform a contraction movement through the sliding shaft 22, so that the transmission slider 21 and the displacement amplification mechanism 31 return to their original positions.

[0033] The transmission slider 21 is specifically as follows Figure 2-6 As shown, the transmission slider 21 is a plate-like structure as a whole, and the two sides of one end thereof are bent downward and extended to form two connecting arms 213, and the two connecting arms 213 are provided with connecting holes for assembling the sliding shaft 22. One side edge of the middle part of the transmission slider 21 is bent upward and extended to form a matching portion 211 for matching with the rotating shaft 41 of the moving contact 4, and a notch 212 is provided on the matching portion 211. Preferably, when the circuit breaker is opened, the rotating shaft 41 of the moving contact 4 extends into the notch 212 to drive the transmission slider 21 to rotate around the sliding shaft 22 ( Figure 3 , 4The transmission slider 21 rotates clockwise), causing the other end of the transmission slider 21 to rotate in the direction close to the displacement amplification mechanism 31. Under the pressing action of the transmission slider 21, the displacement amplification mechanism 31 is stretched and drives the sliding shaft 22 to drive the transmission slider 21 and one end of the elastic member 24 to move in the direction away from the fixed shaft 23. At the same time, the displacement amplification mechanism 31 also drives the arc-isolating member 32 to extend between the moving contact 4 and the static contact 5 to cut off the arc. At this time, the elastic member 24 is in a stretched energy storage state; when the circuit breaker is closed, the rotating shaft 41 of the moving contact 4 moves out of the notch 212 and releases the cooperation with the transmission slider 21. At this time, the elastic member 24 releases energy and moves in the direction close to the fixed shaft 23 and drives the displacement amplification mechanism 31 to perform a contraction movement through the sliding shaft 22, so that the arc-isolating member 32 moves out between the moving contact 4 and the static contact 5 to prevent the arc-isolating member 32 from interfering with the closing of the circuit breaker. At this time, the transmission slider 21 is also driven by the sliding shaft 22 to return to its original position. In this embodiment, the elastic member 24 is preferably a tension spring, and two tension springs are symmetrically arranged on both sides of the housing 1.

[0034] The displacement amplification mechanism 31 of the arc isolation assembly 3 is a triangular hinge type displacement amplification mechanism 31, and the triangular hinge type displacement amplification mechanism 31 can perform compression and extension movement after being pressed. One end of the triangular hinge type displacement amplification mechanism 31 is slidably matched with the shell 1 through the sliding shaft 22, and the other end is assembled on the shell 1 through the fixed shaft 23. When the moving contact 4 is opened and rotated, the rotating shaft 41 of the moving contact 4 presses the transmission slider 21 in a direction perpendicular to the shell 1, and presses the triangular hinge type displacement amplification mechanism 31 through the transmission slider 21 to make it compressed and extended in a direction parallel to the shell 1 and drive the arc isolation member 32 to extend between the moving contact 4 and the static contact 5 to cut off the arc. When the moving contact 4 is closed and rotated, the moving contact 4 is released from the elastic sliding assembly 2, and the transmission slider 21 no longer presses the triangular hinge type displacement amplification mechanism 31. Under the action of the elastic member 24, the sliding shaft 22 drives the triangular hinge type displacement amplification mechanism 31 to perform a contraction movement. Obviously, when the circuit breaker is opened, the moving contact 4 causes the displacement of the transmission slider 21 to be smaller than the displacement of the arc-isolating member 32. Thus, when the elastic sliding assembly 2 and the displacement amplification mechanism 31 cooperate to convert the displacement direction, the smaller displacement of the transmission slider 21 is obviously amplified into a larger displacement of the arc-isolating member 32, which is more conducive to the arc-isolating member 32 to cut off the arc.

[0035] like Figure 7As shown, the displacement amplification mechanism 31 includes a plurality of connecting rods 311 and a plurality of first connecting members 312 and second connecting members 313 which are connected end to end and hinged on the connecting rods 311. The plurality of connecting rods 311 are arranged in two rows at intervals, and the connecting rods 311 in the upper and lower rows are staggered relative to each other. The head end of the first connecting member 312 is connected to the connecting rod 311 in the lower row, the tail end of the first connecting member 312 and the head end of the second connecting member 313 are connected to the same connecting rod 311 in the upper row, and the tail end of the second connecting member 313 is connected to another connecting rod 311 in the lower row. When the displacement amplification mechanism 31 is in operation, the connecting rod 311 in the upper row gradually extends into the gap formed between the two adjacent connecting rods 311 in the lower row, so that the first connecting member 312 and the second connecting member 313 tend to be in a straight line state, thereby realizing the compression and extension movement of the displacement amplification mechanism 31 and driving the arc-isolating member 32 to extend between the moving contact 4 and the stationary contact 5. After the pressing action on the displacement amplification mechanism 31 is released, the connecting rod 311 in the upper row and the first connecting member 312 and the second connecting member 313 return to their original positions, realizing the contraction movement of the displacement amplification mechanism 31, thereby driving the arc-isolating member 32 to move out from between the moving contact 4 and the stationary contact 5. The displacement amplification mechanism 31 is preferably made of metal material, and the connecting rod 311, the first connecting member 312 and the second connecting member 313 can be made of stainless steel.

[0036] like Figure 1 , 2 As shown, the arc-isolating member 32 connected to one end of the displacement amplification mechanism 31 is a plate-like structure, one end of the arc-isolating member 32 is connected to the displacement amplification mechanism 31, and a notch 321 is provided in the middle of the other end of the arc-isolating member 32 so that the arc-isolating member 32 is Y-shaped as a whole. In this embodiment, the arc-isolating member 32 has a certain curvature as a whole. Such a structure enables the arc-isolating member 32 to correspond to the arc-extinguishing chamber of the circuit breaker, and facilitates the arc-isolating member 32 to extend between the moving contact 4 and the stationary contact 5 to extinguish the arc in the circuit breaker. Preferably, the arc-isolating member 32 is made of thermoplastic or plastic material to facilitate cutting off the arc.

[0037] Furthermore, the arc isolation assembly 3 also includes an insulating cover 33 assembled on the shell 1. The insulating cover 33 is arranged at the end opposite to the arc isolation member 32 and is used to insulate the transmission slider 21 and the displacement amplification mechanism 31 when the circuit breaker is closed. When the circuit breaker is in the closed state, the electrical gap between the transmission slider 21 and the displacement amplification mechanism 31 and the metal parts of the release part inside the circuit breaker is small, and the insulating cover 33 can insulate the transmission slider 21 and the displacement amplification mechanism 31; when the circuit breaker is opened, the circuit of the circuit breaker is de-energized, and as the transmission slider 21 and the displacement amplification mechanism 31 move, the insulating cover 33 does not need to provide insulation protection for the two.

[0038] Preferably, a housing 1 is provided with a housing 12 for accommodating the displacement amplification mechanism 31 and the elastic sliding assembly 2. The housing 12 provides a relatively closed installation space for the elastic sliding assembly 2 and the displacement amplification mechanism 31, which is conducive to mutual interference with other components in the circuit breaker. Strip grooves serving as guide grooves 11 are provided on both side walls of the housing 12. The guide grooves 11 are used to slide with the sliding shaft 22, and a limiting protrusion 14 for limiting the sliding range of the transmission slider 21 is provided on one side of the guide groove 11. The transmission slider 21 is located between the displacement amplification mechanism 31 and the moving contact 4. The arc-isolating member 32 is located outside the housing 12 and close to the side of the displacement amplification mechanism 31 where the sliding shaft 22 is assembled. Of course, the arc-isolating member 32 can also be located in the housing 12, but an opening for the arc-isolating member 32 to enter and exit needs to be opened at one end of the housing 12, and the structure of arranging the arc-isolating member 32 in the housing 12 requires the housing 1 to provide a sufficiently long telescopic space, but is not conducive to the miniaturization design of the circuit breaker.

[0039] Combination Figure 2 An embodiment of a housing 1 is provided, wherein the housing 1 is a groove structure with one side open, wherein a groove in the middle thereof serves as an accommodating cavity 12, and strip grooves parallel to the accommodating cavity 12 are provided on both side walls of the accommodating cavity 12, wherein the strip grooves serve as guide grooves 11 for cooperating with the elastic sliding assembly 2 and the displacement amplification mechanism 31 to perform telescopic movement in the accommodating cavity 12, and a limiting protrusion 14 is provided on one side of the guide groove 11, such as Figure 2 As shown, the limiting protrusion 14 is located on the upper side of the guide groove 11 and close to the middle position, and stops sliding when the connecting arm 213 slides to the position of the limiting protrusion 14. In the present embodiment, the limiting protrusion 14 and the connecting arm 213 are both located on the outer wall of the accommodating chamber 12, and of course, both of them can also be arranged on the inner wall of the accommodating chamber 12; the side walls on both sides of one end of the accommodating chamber 12 extend outward to form an extension wall 13, and the height of the extension wall 13 is higher than the side walls of other parts of the accommodating chamber 12, and an insulating cover 33 for insulating the transmission slider 21 and the displacement amplification mechanism 31 can be provided on the extension wall 13. The extension wall 13 makes the insulating cover 33 installed thereon higher than other parts of the shell 1, and the end of the other end of the accommodating chamber 12 is open to avoid the telescopic movement of the arc isolation member 32.

[0040] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An arc-isolating mechanism of a circuit breaker, characterized in that : comprising a housing (1) and an elastic sliding component (2) and an arc-isolating component (3) mounted on the housing (1); the elastic sliding component (2) is used to cooperate with a moving contact (4) of a circuit breaker; when the moving contact (4) is opened or closed, the elastic sliding component (2) and the arc-isolating component (3) cooperate to perform telescopic movement along the housing (1); The elastic sliding assembly (2) comprises a transmission slider (21), a sliding shaft (22) and an elastic member (24); one end of the transmission slider (21) and the elastic member (24) are connected to the sliding shaft (22); the arc isolation assembly (3) comprises a displacement amplification mechanism (31) and an arc isolation member (32) driven by the displacement amplification mechanism (31); one end of the displacement amplification mechanism (31) is connected to the sliding shaft (22); when the circuit breaker is opened, the moving contact (4) presses the displacement amplification mechanism in a direction perpendicular to the housing (1) via the transmission slider (21). The displacement amplification mechanism (31) is configured to cause the displacement amplification mechanism (31) to perform a stretching movement in the direction of the housing (1), the displacement amplification mechanism (31) causes the elastic member (24) to be stretched through the sliding shaft (22), and the arc-isolating member (32) extends between the moving contact (4) and the stationary contact (5) of the circuit breaker; when the circuit breaker is closed, the elastic member (24) drives the transmission slider (21) and the displacement amplification mechanism (31) to perform a contraction movement in the direction of the housing (1) through the sliding shaft (22), and the arc-isolating member (32) moves out from between the moving contact (4) and the stationary contact (5) of the circuit breaker.

2. The arc isolation mechanism of a circuit breaker according to claim 1, characterized in that: A matching portion (211) is provided in the middle of the transmission slider (21); when the circuit breaker is opened, the rotating shaft (41) of the moving contact (4) can match with the matching portion (211), so that the end of the transmission slider (21) away from the sliding shaft (22) rotates and presses the displacement amplification mechanism (31); when the circuit breaker is closed, the rotating shaft (41) of the moving contact (4) is released from the matching portion (211), so that the end of the transmission slider (21) away from the sliding shaft (22) is released from the pressing match with the displacement amplification mechanism (31).

3. The arc isolation mechanism of a circuit breaker according to claim 1 or 2, characterized in that: The displacement amplification mechanism (31) can perform a stretching movement after being pressed. One end of the displacement amplification mechanism (31) is slidably matched with the housing (1) via a sliding shaft (22), and the other end of the displacement amplification mechanism (31) is fixedly connected to the housing (1). When the moving contact (4) is opened and rotated, the pressing of the moving contact (4) causes the transmission slider (21) to rotate around the sliding shaft (22), and the end of the transmission slider (21) away from the sliding shaft (22) presses the displacement amplification mechanism (31) to be stretched. When the moving contact (4) is closed and rotated, the moving contact (4) releases the match with the transmission slider (21), and the elastic member (24) drives the displacement amplification mechanism (31) to perform a contraction movement via the sliding shaft (22).

4. The arc isolation mechanism of a circuit breaker according to claim 1, characterized in that: The displacement amplification mechanism (31) is a triangular hinge type displacement amplification mechanism (31), comprising a plurality of connecting rods (311) and a plurality of first connecting members (312) and second connecting members (313) connected end to end, wherein the plurality of connecting rods (311) are arranged in two rows at intervals, and the connecting rods (311) in the two rows are staggered relative to each other, the head end of the first connecting member (312) is connected to a connecting rod (311) in the lower row, the tail end of the first connecting member (312) and the head end of the second connecting member (313) are connected to the same connecting rod (311) in the upper row, and the tail end of the second connecting member (313) is connected to another connecting rod (311) in the lower row.

5. The arc isolation mechanism of a circuit breaker according to claim 1, characterized in that: A housing cavity (12) is provided in the middle of the housing (1), and the elastic sliding assembly (2) and the displacement amplification mechanism (31) are installed in the housing cavity (12). A guide groove (11) for slidingly cooperating with the sliding shaft (22) is provided on the side wall of the housing cavity (12), and a limiting protrusion (14) is provided on one side of the guide groove (11), and the limiting protrusion (14) is used to limit the sliding range of the transmission slider (21).

6. The arc isolation mechanism of a circuit breaker according to claim 1, characterized in that: The shell (1) is a groove-type structure with one side open, wherein the groove in the middle serves as a receiving chamber (12), the side walls on both sides of one end of the receiving chamber (12) extend outward to form an extension wall (13), and the end of the other end of the receiving chamber (12) is open to avoid the arc isolation member (32), and guide grooves (11) are provided on the two side walls of the receiving chamber (12), and the guide grooves (11) are used to slide with the sliding shaft (22), and the guide grooves (11) are strip grooves parallel to the receiving chamber (12), and a limiting protrusion (14) is protruding from one side of the strip groove.

7. The arc isolation mechanism of a circuit breaker according to claim 1, characterized in that: The transmission slider (21) is in the form of a plate-like structure as a whole. An edge of one side in the middle of the transmission slider (21) is bent upward and extended to form a matching portion (211) for matching with the moving contact (4). A notch (212) is provided on the matching portion (211) for the rotating shaft (41) of the moving contact (4) to extend therein. Both sides of one end of the transmission slider (21) are bent downward and extended to form two connecting arms (213). Both connecting arms (213) are provided with connecting holes for assembling the sliding shaft (22).

8. The arc isolation mechanism of a circuit breaker according to claim 1, characterized in that: The arc isolation member (32) is a plate-shaped structure. One end of the arc isolation member (32) is connected to the displacement amplification mechanism (31). A notch (321) is provided in the middle of the other end of the arc isolation member (32), so that the arc isolation member (32) is Y-shaped as a whole.

9. The arc isolation mechanism of a circuit breaker according to claim 1, characterized in that: The arc isolation assembly (3) further comprises an insulating cover (33) mounted on the housing (1); the insulating cover (33) is arranged at an end opposite to the arc isolation member (32) and is used to insulate the transmission slider (21) and the displacement amplification mechanism (31) when the circuit breaker is closed.

10. The arc isolation mechanism of a circuit breaker according to claim 1, characterized in that: The elastic sliding assembly (2) further comprises a fixed shaft (23), wherein the fixed shaft (23) is fixedly mounted on the housing (1), and the other end of the elastic member (24) and the other end of the displacement amplification mechanism (31) are connected to the fixed shaft (23).

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