Protection structure of contact mechanism and circuit breaker

Abstract

A protection structure of a contact mechanism and a circuit breaker, the circuit breaker comprises the protection structure of the contact mechanism, the protection structure of the contact mechanism comprises a moving contact, a static contact and a contact support, the moving contact is arranged on the contact support, the static contact comprises a main static contact and an arc static contact which are arranged at an interval, and the arc static contact is arranged on the main static contact. The moving contact comprises a main moving contact corresponding to the main static contact and an arc moving contact corresponding to the arc static contact, the distance from the arc moving contact to the rotating center of the contact support is larger than the distance from the main moving contact to the rotating center of the contact support, the contact support drives the moving contact to be in contact with or separated from the static contact, and when the moving contact is separated from the static contact, the moving contact is separated from the static contact. An area between the arc moving contact and the arc static contact is a first area, an area between the main moving contact and the main static contact is a second area, and when the moving contact is separated from the static contact, the baffle moves to be isolated between the first area and the second area to prevent the arc from migrating from the first area to the second area.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a protective structure for a contact mechanism and a circuit breaker. Background Technology

[0002] As the core component of a circuit breaker that enables circuit switching, the moving contact directly affects the reliability of circuit breaking. In frame-type circuit breakers, a contact assembly consisting of multiple contact pieces is used as the moving contact. The contact assembly typically employs a method where the arc-initiating contact and the main contact work together. The main contact is responsible for carrying current, while the arc-initiating contact is used to generate an arc when the circuit is broken and guide the arc into the arc-extinguishing mechanism to extinguish the arc.

[0003] However, during the circuit breaking process, although the arc starts on the surface of the arc-initiating contact, it may not move towards the arc-extinguishing mechanism according to the predetermined trajectory, but instead migrate in the opposite direction to the main contact, resulting in the arc not being extinguished, the breaking failure, and serious damage to the entire circuit. Utility Model Content

[0004] The purpose of this utility model is to overcome at least one defect of the prior art and provide a protective structure for a contact mechanism.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A protective structure for a contact mechanism includes a moving contact, a stationary contact, and a contact support. The moving contact is disposed on the contact support. The stationary contact includes a main stationary contact and an arc-shaped stationary contact spaced apart. The moving contact includes an active contact corresponding to the main stationary contact and an arc-shaped moving contact corresponding to the arc-shaped stationary contact. The distance from the arc-shaped moving contact to the rotation center of the contact support is greater than the distance from the active contact to the rotation center of the contact support. The contact support drives the moving contact to contact and separate from the stationary contact. When the moving contact separates from the stationary contact, the area between the arc-shaped moving contact and the arc-shaped stationary contact is a first area, and the area between the active contact and the main stationary contact is a second area.

[0007] It also includes a movable baffle that moves to a position isolated between the first region and the second region when the moving contact separates from the stationary contact.

[0008] Preferably, it also includes an elastic element, and the baffle is movable between a first position and a second position. When the moving contact separates from the stationary contact, the elastic element drives the baffle to move to the first position, which is isolated between the first region and the second region. When the moving contact contacts the stationary contact, the baffle moves to the second position under the drive of the moving mechanism, overcoming the force of the elastic element.

[0009] Preferably, it also includes an arc extinguishing mechanism, which includes an arc extinguishing channel. The arc stationary contact is located at one end of the arc extinguishing channel. The arc moving contact moves along the arc extinguishing channel to contact and separate from the arc stationary contact. When the baffle moves to between the first region and the second region, the baffle is located in the arc extinguishing channel, and the active contact and the main stationary contact are located on the side of the baffle away from the arc extinguishing grid.

[0010] Preferably, the arc extinguishing mechanism further includes two arc-blocking plates, which are symmetrically arranged on both sides of the arc extinguishing channel. When the baffle moves between the first region and the second region, the baffle is inserted between the two arc-blocking plates and forms a groove with the two arc-blocking plates facing the arc-extinguishing grid.

[0011] Preferably, the arc-blocking plate is made of a gas-generating material, and / or the baffle is made of a gas-generating material.

[0012] Preferably, when closing, the arcing contact contacts the arcing stationary contact before the active contact contacts the main stationary contact, and then separates from the arcing stationary contact after the active contact contacts the main stationary contact; when opening, the arcing contact contacts the arcing stationary contact before the active contact completely separates from the main stationary contact, and then separates from the arcing stationary contact after the active contact separates from the main stationary contact.

[0013] Preferably, the moving contact includes a plurality of moving conductive plates, each of which has an active contact. At least a portion of the moving conductive plates extends to form an extension portion, which has an arcing contact. The moving conductive plates are rotatably connected to the contact support via a support shaft, and a contact spring is provided between the moving conductive plates and the contact support. The moving mechanism is the extension portion, and when the moving contact moves closer to the stationary contact, it pushes the baffle to a second position via the extension portion.

[0014] Preferably, when the baffle is in the first position, the first end of the baffle is located between the active contact and the arcing contact, the middle part of the baffle is isolated between the first region and the second region, and the second end is located between the main stationary contact and the arcing stationary contact.

[0015] Preferably, when the baffle is in the first position or the second position, or moves between the first position or the second position, the baffle is always isolated between the main stationary contact and the arc stationary contact.

[0016] Preferably, the stationary contact includes a contact support, the arc stationary contact is disposed on the contact support and connected to the main stationary contact through the contact support, and the baffle is linearly movable on the contact support.

[0017] Preferably, the baffle is connected to the guide seat, and the contact bracket includes a front side plate and a rear side plate, and a bottom side plate connected between the front side plate and the rear side plate. The front side plate is provided with a front guide hole, through which the baffle slides. The rear side plate is provided with a rear guide hole, through which the guide seat slides. The end of the guide seat connected to the baffle is provided with a stepped surface, which limits the front side plate to prevent the guide seat from passing through the front guide hole.

[0018] Preferably, the end of the baffle away from the guide seat is the first end, the end of the baffle connected to the guide seat is the second end, the elastic element is a compression spring, the end of the guide seat away from the baffle is connected to the elastic element, and the end of the elastic element away from the guide seat is connected to the housing.

[0019] Preferably, it also includes a partition, which moves at least between the active contact and the main stationary contact when the moving contact separates from the stationary contact, and moves out of the space between the active contact and the main stationary contact when the moving contact and the stationary contact come into contact.

[0020] A circuit breaker includes a housing, an operating mechanism disposed within the housing, and at least one switching unit. The switching unit includes a protective structure for the contact mechanism as described in any one of the claims. The operating mechanism is connected to a contact support and drives the moving contact to contact and separate from the stationary contact.

[0021] The protective structure of the contact mechanism of this utility model has a baffle that moves to a position between the first region and the second region when the moving contact and the stationary contact are separated, thereby blocking the electric arc from migrating from the first region to the second region and preventing the main stationary contact and the moving contact from burning.

[0022] Furthermore, when the baffle moves to the first position between the first and second isolation areas, the baffle is located in the arc extinguishing channel and at the entrance of the arc extinguishing mechanism, ensuring that the arc has only one path to enter the arc extinguishing grid and preventing the arc from spreading in other directions.

[0023] In addition, when the baffle moves to the first position, the baffle is vertically inserted between the two arc-blocking plates and forms a gas-generating groove with the two arc-blocking plates facing the arc-extinguishing grid. The electric arc can form a high-pressure area at the bottom of the gas-generating groove. The high-speed airflow is formed by the pressure difference to drive the electric arc to migrate towards the arc-extinguishing grid, which can extinguish the arc more quickly.

[0024] Furthermore, the integrated design of the contact bracket and baffle can effectively utilize the space between the arc stationary contact and the main stationary contact, and there is no need to set up additional parts for the baffle. It has the characteristics of fewer parts and smaller size. The baffle and stationary contact can also be pre-assembled as a whole and then installed into the circuit breaker, which can simplify the assembly process.

[0025] In addition, the baffle is always isolated between the main stationary contact and the arc stationary contact, which can prevent the arc from migrating to the second region in advance at the initial stage of the tripping. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the baffle in the second position when the contact mechanism is closed;

[0027] Figure 2 This is a cross-sectional view of the baffle in the first position when the contact mechanism is open;

[0028] Figure 3 This is a schematic diagram of the arc-extinguishing mechanism;

[0029] Figure 4 This is a schematic diagram showing the interaction between the arc-extinguishing mechanism and the baffle.

[0030] Figure 5 This is a schematic diagram of the moving contact.

[0031] Figure 6 This is a schematic diagram of the stationary contact.

[0032] Figure 7 This is a structural diagram of the baffle and guide seat;

[0033] Figure 8 This is an assembly diagram of the stationary contact, baffle, and base;

[0034] Figure 9 This is an assembly diagram of the baffle, elastic element, and base;

[0035] In the picture:

[0036] Detailed Implementation

[0037] The specific embodiments of the protective structure of the contact mechanism of this utility model are further described below with reference to the accompanying drawings. The protective structure of the contact mechanism of this utility model is not limited to the description of the following embodiments.

[0038] The circuit breaker of this embodiment includes a housing and an operating mechanism (not shown in the diagram), a protection mechanism, a drive mechanism, and at least one switching unit, all respectively disposed within the housing. The switching unit includes a contact mechanism, an arc-extinguishing mechanism 1, and two wiring mechanisms. The contact mechanism includes a moving contact 2, a stationary contact 3, and a contact support (not shown in the diagram). The moving contact 2 is disposed on the contact support. The moving contact 2 and the stationary contact 3 are respectively connected to the circuit through corresponding wiring mechanisms. The contact support can drive the moving contact 2 to contact and separate from the stationary contact 3, thereby respectively connecting and disconnecting the connected circuit. A main shaft is provided on one side of the operating mechanism, and the operating mechanism is connected via the main shaft. The main shaft is equipped with a cantilever for rotating the contact support 2, which is connected to the contact support. Driven by the drive mechanism, the operating mechanism rotates the contact supports of all switching units via the main shaft, causing the contact supports to engage and disengage the moving contact 2 from the stationary contact 3. The drive mechanism can be a manually operated handle or an electric motor. The protection mechanism unlocks the operating mechanism when a line fault occurs, causing the operating mechanism to release the tripping spring. The tripping spring then drives the contact support 2 to separate the moving contact 2 from the stationary contact 3, thus disconnecting the line and achieving the protection function. The arc-extinguishing mechanism 1 extinguishes the arc generated by the contact system. The protection mechanism typically includes an overload protection mechanism and / or a short-circuit protection mechanism.

[0039] like Figure 1-2 As shown, the stationary contact 3 includes a main stationary contact 31 and an arc stationary contact 32 spaced apart. The moving contact 2 includes an active contact 21 corresponding to the main stationary contact 31 and an arc moving contact 22 corresponding to the arc stationary contact 32. The distance from the arc moving contact 22 to the contact support rotation center is greater than the distance from the active contact 21 to the contact support rotation center. The contact supports driving the moving contact 2 to contact and separate from the stationary contact 3 to achieve closing and opening. When the moving contact 2 separates from the stationary contact 3, the area between the arc moving contact 22 and the arc stationary contact 32 is the first area, and the area between the active contact 21 and the main stationary contact 31 is the second area.

[0040] An improvement in this embodiment is that it also includes a movable baffle 4. When the moving contact 2 separates from the stationary contact 3, the baffle 4 moves to a position isolated between the first region and the second region, blocking the arc from migrating from the first region to the second region and preventing the main stationary contact 31 and the moving contact 21 from being burned.

[0041] In this embodiment, the protective structure of the contact mechanism achieves precise isolation of the arc path by moving the baffle 4 between the first and second regions. When the circuit is opened, the baffle 4 moves between the first and second regions. The isolation effect of the baffle 4 restricts the arc to the first region, blocks the arc from migrating to the second region, avoids the main contact from burning, and ensures that the arc can only move away from the active contact 21 and the main stationary contact 31.

[0042] like Figure 1-2As shown, the protective structure of the contact mechanism in this embodiment also includes an elastic element 5. The baffle 4 can move between a first position and a second position. When opening, the moving contact 2 separates from the stationary contact 3. The elastic element 5 drives the baffle 4 to move to the first position, which is isolated between the first and second regions. The movement of the baffle 4 to the first position by the elastic element 5 ensures the isolation speed, and the elastic element 5 can also accelerate the separation of the moving contact 2 and the stationary contact 3. When closing, the moving contact 2 contacts the stationary contact 3. Under the drive of the moving mechanism, the baffle 4 overcomes the force of the elastic element 5 and moves to the second position to avoid the moving contact 2, ensuring reliable contact between the moving contact 2 and the stationary contact 3. The moving mechanism is linked with the operating mechanism. The moving mechanism can be the moving contact 2, the contact support, or a component on the operating mechanism, or a transmission rod connected to the operating mechanism, the moving contact 2, and the contact support. In this embodiment, the moving mechanism is the moving contact 2. While the moving contact 2 contacts the stationary contact 3, the moving contact 2 directly drives the baffle 4 to move to the second position.

[0043] In another embodiment, the moving mechanism can drive the baffle 4 to move to the first position, and the elastic element 5 can drive the baffle 4 to move to the second position. The elastic element 5 can be a spring, leaf spring, torsion spring, or an elastic arm integrally formed with the baffle, etc.

[0044] It should be noted that in the prior art, there is a type of partition where, when the moving contact 2 separates from the stationary contact 3, the partition moves at least between the active contact 21 and the main stationary contact 31; and when the moving contact 2 contacts the stationary contact 3, the partition moves out of the space between the active contact 21 and the main stationary contact 31. This differs from the position and function of the baffle 4 in this application, which is isolated between the first and second regions, i.e., between the main stationary contact 31 and the arc stationary contact 32 and / or between the active contact 21 and the arc moving contact 22. As another embodiment, this application may also simultaneously provide the baffle 4 and the partition.

[0045] like Figure 1-2 The distance from the arc-moving contact 22 and the arc-stationary contact 32 to the arc-extinguishing mechanism 1 is less than the distance from the active contact 21 and the main stationary contact 31 to the arc-extinguishing mechanism 1. The baffle 4 is set so that when the circuit is opened, the arc between the arc-moving contact 22 and the arc-stationary contact 32 can only migrate in the direction of the arc-extinguishing mechanism 1.

[0046] Preferred, such as Figure 3-4 As shown, the arc extinguishing mechanism 1 includes multiple arc extinguishing grid plates 11. The arc extinguishing grid plates 11 have an arc extinguishing notch 12 on one side facing the contact system, and grid plate support legs 13 are provided on opposite sides of the arc extinguishing notch 12. The arc extinguishing channels 14 are formed by the arc extinguishing notches 12 of the multiple arc extinguishing grid plates 11. The arc stationary contact 32 is located at one end of the arc extinguishing channel 14. The arc moving contact 22 extends into the arc extinguishing channel 14 and moves along the arc extinguishing channel 14 to contact and separate from the arc stationary contact 32.

[0047] When the baffle 4 moves to the first position between the first and second isolation areas, the baffle 4 is located in the arc-extinguishing channel 14, and the active contact 21 and the main stationary contact 31 are located on the side of the baffle 4 away from the arc-extinguishing grid 11. See also Figure 2 The active contact 21 is located on the side of the first end 41 of the baffle 4 away from the arc-extinguishing grid plate 11, and the main stationary contact 31 is located on the side of the second end 42 away from the arc-extinguishing grid plate 11, so that the baffle 4 is located at the entrance of the arc-extinguishing mechanism 1, ensuring that the arc has only one path to enter the arc-extinguishing grid plate 11, and preventing the arc from spreading in other directions.

[0048] Furthermore, such as Figure 3-4 As shown, the arc extinguishing mechanism 1 also includes two arc-blocking plates 15. The two arc-blocking plates 15 are respectively connected to the grid plate support legs 13 on both sides of the arc extinguishing grid plate 11 and are symmetrically arranged on both sides of the arc extinguishing channel 14. When the baffle 4 moves to the first position, the baffle 4 is vertically inserted between the two arc-blocking plates 15 and forms a U-shaped groove with the opening facing the arc extinguishing grid plate 11. The arc-blocking plates 15 are made of gas-generating materials such as PA46, PA66, and POM gas-generating materials, and / or the baffle 4 is made of gas-generating materials. The arc-blocking plates 15 and the baffle 4 form a gas-generating groove. When the electric arc is generated, the gas-generating material can release a large amount of gas, forming a high-pressure area at the bottom of the gas-generating groove. The high-speed airflow is formed by the pressure difference with the area of ​​the arc extinguishing grid plate 11 to drive the electric arc to migrate towards the arc extinguishing grid plate 11, which can extinguish the arc more quickly. It is understandable that the arc-blocking plate 15 may not use gas-generating materials. It can also use the high-temperature gas generated by the electric arc to form a high-pressure area at the bottom of the gas-generating groove and form a high-speed airflow effect through the pressure difference.

[0049] Preferably, the baffle 4 includes two baffles 43 corresponding to the two arc-blocking plates 15 respectively, which slide in cooperation with the arc-blocking plates 15. Corresponding grooves can also be provided on the arc-blocking plates 15. The baffles 43 can be in contact and sealed with the corresponding arc-blocking plates 15, or there can be a small gap to ensure smooth movement of the baffle 4.

[0050] like Figure 5-6 As shown, the stationary contact 3 includes a stationary conductive plate 33, and contact brackets 34 and connecting brackets 35 disposed opposite to each other on both sides of the stationary conductive plate 33. The stationary conductive plate 33 is connected to the base 6 of the housing through the contact brackets 34 and connecting brackets 35 respectively. The stationary conductive plate 33 can also be directly connected to the base 6. The main stationary contact 31 is elongated and is disposed on the stationary conductive plate 33 at the end of the stationary conductive plate 33. The arc stationary contact 32 is disposed on the contact bracket 34 and is connected to the main stationary contact 31 through the contact bracket 34.

[0051] The moving contact 2 includes several moving conductive plates 23 and a contact spring (not shown) connected to the moving conductive plates 23 to provide overtravel driving force. The moving contact 2 is mounted on a contact support, and the contact spring is disposed between the moving contact 2 and the contact support. The moving conductive plates 23 are provided with active contacts 21, wherein at least a portion of the moving conductive plates 23 extends to form an extension portion 24, and the extension portion 24 is provided with an arcing contact 22. Each moving conductive plate 23 is provided with a pivot hole 25 (not shown) connected to the support shaft. The moving conductive plates 23 are rotatably connected to the contact support through the support shaft. A contact spring is provided between the moving conductive plates 23 and the contact support. The contact support can drive all active contacts 21 to contact and separate from the main stationary contact 31 respectively, so as to realize closing and opening.

[0052] When closing, the arcing contact 22 contacts the arcing stationary contact 32 before the active contact 21 contacts the main stationary contact 31, and then separates from the arcing stationary contact 32 after the active contact 21 contacts the main stationary contact 31. When opening, the arcing contact 22 contacts the arcing stationary contact 32 before the active contact 21 completely separates from the main stationary contact 31, and then separates from the arcing stationary contact 32 after the active contact 21 separates from the main stationary contact 31.

[0053] The specific process is as follows: When closing the circuit, the contact support drives the moving contact 2 to move towards the stationary contact 3. The arcing contact 22 first contacts the arcing stationary contact 32. After the arcing contact 22 contacts the arcing stationary contact 32, the contact support drives the moving contact 22 to continue moving so that the active contact 21 contacts the main stationary contact 31 and compresses the contact spring. After the active contact 21 contacts and presses against the main stationary contact 31, it lifts up the arcing contact 22, causing the arcing contact 22 to separate from the arcing stationary contact 32, thus completing the closing action. During opening, the contact support moves in the reverse direction, causing the active contact 21 to separate from the main stationary contact 31. The contact spring releases its elastic force, keeping the active contact 21 and the main stationary contact 31 in contact in the initial stage. Before the active contact 21 and the main stationary contact 31 are completely separated, the arcing contact 22 contacts the arcing stationary contact 32. The contact support continues to drive the active contact 2 to move in the reverse direction. After the active contact 21 and the main stationary contact 31 are completely separated, the arcing contact 22, driven by the contact support, separates from the arcing stationary contact 32 and generates an electric arc. The electric arc is generated in the first region A between the arcing contact 22 and the arcing stationary contact 32. The baffle 4 prevents the electric arc from migrating to the second region B. Figure 2 .

[0054] In a preferred embodiment, the moving mechanism is the extension 24 of the moving contact 2. When the moving conductive plate 23 moves close to the stationary contact 3, the extension 24 pushes the baffle 4 to the second position.

[0055] In another embodiment, the moving mechanism is an operating mechanism, such as an operating handle, an energy storage spring, and a main shaft. The energy storage spring drives the contacts to rotate via the main shaft to achieve opening and closing of the circuit breaker. The main shaft is equipped with a linkage mechanism, a cam mechanism, or an electromagnet mechanism. When closing the circuit breaker, the main shaft drives the baffle 4 to move to the second position via the linkage mechanism, cam mechanism, or electromagnet mechanism. All of these are within the protection scope of this utility model.

[0056] In a preferred embodiment, the baffle 4 is linearly movable on the contact bracket 34. Through the integrated design of the contact bracket 34 and the baffle 4, the space between the arc stationary contact 32 and the main stationary contact 31 can be effectively utilized, eliminating the need for additional parts to install the baffle 4. This design features fewer parts and a smaller size. Furthermore, the baffle 4 and the stationary contact 3 can be pre-assembled as a single unit before being installed into the circuit breaker, simplifying the assembly process. It is understood that the baffle 4 can be installed on the base 6 or on a separate mounting base. The baffle 4 can also be rotatable. Rotational installation of the baffle 4 improves the utilization of longitudinal space and reduces lateral dimensions, while linear movement shortens the time it takes for the baffle 4 to move into position, reducing the arc transfer window period.

[0057] like Figure 1-2 As shown in Figure 7, the baffle 4 has a cuboid structure and can move between a first position and a second position. When the moving contact 2 separates from the stationary contact 3, the elastic element 5 drives the baffle 4 to move from the second position to the first position. When the baffle 4 is in the first position, the middle part of the baffle 4 is isolated between the first region and the second region. The first end 41 of the baffle 4 is located between the active contact 21 and the arc-shaped moving contact 22, and the second end 42 is located between the main stationary contact 31 and the arc-shaped stationary contact 32. When the moving contact 2 contacts the stationary contact 3, the baffle 4 overcomes the force of the elastic element 5 under the drive of the moving contact 2 and moves from the first position to the second position. When the baffle 4 is in the second position, the first end 41 of the baffle 4 is located between the main stationary contact 31 and the arc-shaped stationary contact 32.

[0058] In this embodiment, based on isolating the first region and the second region in the middle of the baffle 4, the first end 41 isolates the active contact 21 and the arcing contact 22, while the second end 42 isolates the main stationary contact 31 and the arc stationary contact 32, forming a triple isolation barrier. This can completely block the path of the arc to migrate to the second region. The arc can only move towards the arc extinguishing grid 11 of the arc extinguishing mechanism 1, and thus be successfully extinguished. This design effectively guides the large current and high voltage arc to enter the arc extinguishing mechanism 1, improving the high current breaking capacity of the switch.

[0059] Preferably, when the baffle 4 is in the first position, or the second position, or moves between the first position and the second position, the baffle 4 is always isolated between the main stationary contact 31 and the arc stationary contact 32, so that the arc can be blocked from migrating to the second region in advance at the initial stage of the circuit breaker opening.

[0060] like Figure 1-2 As shown, when the moving contact 2 contacts the stationary contact 3, the active contact 21 pushes the baffle 4 away from the first position and moves to the second position against the force of the elastic element 5. At this time, the first end 41 of the baffle 4 moves to the position of the second end 42, that is, the first end 41 of the baffle 4 leaves the space between the arc moving contact 22 and the active contact 21 and moves to the space between the main stationary contact 31 and the arc stationary contact 32. The second end 42 of the baffle 4 exits the space between the main stationary contact 31 and the arc stationary contact 32.

[0061] In the initial stage of opening the circuit breaker, since the baffle 4 is in the second position, its first end 41 is already located between the arc stationary contact 32 and the main stationary contact 31, which can prevent the arc from migrating to the main contact in advance. During the opening process, the first end 41 moves towards the arc moving contact 22 and the active contact 21. The middle part of the baffle 4 can maintain continuous isolation. When the baffle 4 finally reaches the first position, its first end 41 is located between the active contact 21 and the arc moving contact 22, and its second end 42 is located between the main stationary contact 31 and the arc stationary contact 32, forming double isolation.

[0062] like Figure 6 As shown, the contact support 34 is U-shaped and includes a front side plate 36 and a rear side plate 37 arranged opposite to each other, and a bottom side plate 38 connected between the front side plate 36 and the rear side plate 37. The bottom side plate 38 is connected to the static conductive plate 33, and the rear side plate 37 is connected to the housing. The front side plate 36 is provided with an extension plate 39 that extends above the rear side plate 37. The arc static contact 32 is disposed on the extension plate 39. The front side plate 36 is provided with a front guide hole 360, and the baffle 4 slides through the front guide hole 360.

[0063] like Figure 7-9 As shown, the baffle 4 is connected to the guide seat 7, the elastic element 5 is a compression spring, the end of the guide seat 7 away from the baffle 4 is connected to the elastic element 5, the end of the baffle 4 away from the guide seat 7 is the first end 41, and the end of the baffle 4 connected to the guide seat 7 is the second end 42. The rear side plate 37 is provided with a rear guide hole 370, and the guide seat 7 slides through the rear guide hole 370. Preferably, the first end 41 of the baffle 4 is chamfered, which can reduce the friction with the moving contact 2.

[0064] Furthermore, the size of the front guide hole 360 ​​matches that of the baffle 4, and the length and / or width of the guide seat 7 is greater than that of the baffle 4. A stepped surface 71 is formed on the end face of the guide seat 7 connected to the baffle 4. The stepped surface 71 can limit the front side plate 36, preventing the guide seat 7 from passing through the front guide hole 360, and thus limiting the maximum distance of the baffle 4. When the baffle 4 is limited to the front side plate 36 under the drive of the elastic member 5, the baffle 4 is located in the first position, that is, between the first region and the second region.

[0065] Preferably, the system includes two elastic elements 5. The guide seat 7 has two limiting holes 72 corresponding to the two elastic elements 5. One end of each elastic element 5 is inserted into the corresponding limiting hole 72, and the end away from the guide seat 7 is inserted into the limiting groove 61 of the base 6 of the housing. Obviously, there may be one or more elastic elements 5.

[0066] During assembly, first follow Figure 9 Assemble the baffle 4, guide seat 7, elastic element 5, and base 6 in the direction indicated by the middle arrow, and then follow the steps... Figure 8 As shown, align the front guide hole 360 ​​and the rear guide hole 370 on the stationary contact 3 with the baffle 4, and then, in the direction shown by the arrow in the figure, put the contact bracket 34 on the baffle 4. Then, fix the contact bracket 34 and the connecting bracket 35 to the base 6 with screws to complete the assembly. The baffle 4 will not fall off under the limitation of the step surface 71 and the contact bracket 34.

[0067] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0068] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A protection structure of a contact mechanism, comprising a moving contact (2), a stationary contact (3) and a contact support, the moving contact (2) is arranged on the contact support, the stationary contact (3) comprises a main stationary contact (31) and an arc stationary contact (32) arranged at intervals, the moving contact (2) comprises a main moving contact (21) corresponding to the main stationary contact (31) and an arc moving contact (22) corresponding to the arc stationary contact (32), the distance from the arc moving contact (22) to the rotation center of the contact support is greater than the distance from the main moving contact (21) to the rotation center of the contact support, the contact support drives the moving contact (2) to contact and separate from the stationary contact (3), when the moving contact (2) separates from the stationary contact (3), the area between the arc moving contact (22) and the arc stationary contact (32) is a first area, and the area between the main moving contact (21) and the main stationary contact (31) is a second area, characterized in that Further comprising a movable baffle (4), when the moving contact (2) separates from the stationary contact (3), the baffle (4) moves to a position isolated between the first area and the second area.

2. The contact mechanism protection structure according to claim 1, characterized in that: Further comprising a resilient member (5), the baffle (4) can move between the first position and the second position, when the moving contact (2) separates from the stationary contact (3), the resilient member (5) drives the baffle (4) to move to the first position isolated between the first area and the second area, when the moving contact (2) contacts the stationary contact (3), the baffle (4) moves to the second position under the driving of the moving mechanism and against the force of the resilient member (5).

3. The contact mechanism protection structure according to claim 1, characterized in that: Further comprising an arc extinguishing mechanism (1), the arc extinguishing mechanism (1) comprises an arc extinguishing channel (14), the arc stationary contact (32) is located at one end of the arc extinguishing channel (14), the arc moving contact (22) moves along the arc extinguishing channel (14) to contact and separate from the arc stationary contact (32), when the baffle (4) moves between the first area and the second area, the baffle (4) is located in the arc extinguishing channel (14), and the main moving contact (21) and the main stationary contact (31) are located on the side of the baffle (4) away from the arc grid (11).

4. The contact mechanism protection structure according to claim 3, characterized in that: The arc extinguishing mechanism (1) further comprises two arc separation plates (15), the two arc separation plates (15) are symmetrically arranged on both sides of the arc extinguishing channel (14), when the baffle (4) moves between the first area and the second area, the baffle (4) is inserted between the two arc separation plates (15) and forms a groove with the two arc separation plates (15), and the opening of the groove faces the arc grid (11).

5. The contact mechanism protection structure according to claim 4, characterized in that: The arc separation plate (15) is made of a gas generating material, and / or the baffle (4) is made of a gas generating material.

6. The contact mechanism protection structure according to claim 1, characterized in that: When closing, the arc moving contact (22) contacts the arc stationary contact (32) before the main moving contact (21) contacts the main stationary contact (31), and the arc moving contact (22) separates from the arc stationary contact (32) after the main moving contact (21) contacts the main stationary contact (31); when opening, the arc moving contact (22) contacts the arc stationary contact (32) before the main moving contact (21) completely separates from the main stationary contact (31), and the arc moving contact (22) separates from the arc stationary contact (32) after the main moving contact (21) separates from the main stationary contact (31).

7. The contact mechanism protection structure according to claim 2, characterized in that: The moving contact (2) comprises several moving conductive plates (23) provided with a main moving contact (21), at least part of the moving conductive plates (23) are extended to form an extension (24) provided with an arc moving contact (22), the moving conductive plates (23) are rotatably connected with the contact support through a support shaft, and the moving conductive plates (23) are provided with a contact spring between the moving conductive plates (23) and the contact support; the moving mechanism is the extension (24), when the moving contact (2) moves close to the static contact (3), the extension (24) pushes the baffle (4) to move to the second position.

8. The contact mechanism protection structure according to claim 1, characterized in that: When the baffle (4) is located at the first position, the first end (41) of the baffle (4) is located between the main moving contact (21) and the arc moving contact (22), the middle part of the baffle (4) is isolated between the first area and the second area, and the second end (42) is located between the main static contact (31) and the arc static contact (32).

9. The contact mechanism protection structure according to claim 8, characterized in that: When the baffle (4) is located at the first position or the second position, or moves between the first position and the second position, the baffle (4) is always isolated between the main static contact (31) and the arc static contact (32).

10. The contact mechanism protection structure according to claim 2, characterized in that: The static contact (3) comprises a contact support (34), the arc static contact (32) is arranged on the contact support (34) and connected with the main static contact (31) through the contact support (34), and the linearly moving baffle (4) is arranged on the contact support (34).

11. The contact mechanism protection structure according to claim 10, characterized in that: The baffle (4) is connected with a guide seat (7), the contact support (34) comprises a front side plate (36) and a rear side plate (37), and a bottom side plate (38) connected between the front side plate (36) and the rear side plate (37), the front side plate (36) is provided with a front guide hole (360), the baffle (4) is slidably matched through the front guide hole (360), the rear side plate (37) is provided with a rear guide hole (370), the guide seat (7) is slidably matched through the rear guide hole (370), one end of the guide seat (7) connected with the baffle (4) is provided with a stepped surface (71), the stepped surface (71) is limited by the front side plate (36) to prevent the guide seat (7) from passing through the front guide hole (360).

12. The contact mechanism protection structure according to claim 11, characterized in that: One end of the baffle (4) away from the guide seat (7) is the first end (41), one end of the baffle (4) connected with the guide seat (7) is the second end (42), the elastic member (5) is a compression spring, one end of the guide seat (7) away from the baffle (4) is connected with the elastic member (5), and one end of the elastic member (5) away from the guide seat (7) is connected with the shell.

13. The contact mechanism protection structure according to claim 1, characterized in that: Further comprising a partition plate, when the moving contact (2) is separated from the static contact (3), the partition plate is at least moved to between the main moving contact (21) and the main static contact (31), and when the moving contact (2) is in contact with the static contact (3), the partition plate is moved out of between the main moving contact (21) and the main static contact (31).

14. A circuit breaker comprising a housing and an operating mechanism and at least one switching unit arranged in the housing, characterized in that: The switch unit comprises the protection structure of the contact mechanism as claimed in any one of claims 1-13, an operating mechanism is connected with the contact support, and the contact support drives the moving contact (2) to contact and separate from the static contact (3).

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