A contact arc quenching system

Abstract

The utility model relates to low voltage electric appliance technical field especially relates to a contact arc extinguishing system. The contact arc extinguishing system includes static contact subassembly and moving contact subassembly, and static contact subassembly includes static conducting pole, main static contact and arc static contact, and moving contact subassembly includes main moving contact and arc moving contact, and the arc extinguishing system still includes arc separation piece and anti -jumping arc protruding, wherein: the arc separation piece is provided with arc separation passageway, and the arc moving contact sets up in the arc separation passageway, and the main moving contact sets up outside the arc separation passageway, the side of the arc separation passageway close to static contact subassembly is equipped with the pass, and the anti -jumping arc protruding is inserted into the arc separation passageway from the pass, and is located between static conducting pole and arc static contact. The arc separation passageway can block the arc and the charged particle at the arc moving contact, avoid the main moving contact and static contact being punctured and generating arc, and improve the breaking performance. The anti -jumping arc protruding can prevent the arc at the arc static contact from jumping to the static conducting pole and the vicinity, thereby avoiding the equipment failure problem caused by the arc jump phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a contact arc extinguishing system. Background Technology

[0002] Arc extinguishing systems are a key component of electrical switches. Typically, an arc extinguishing system includes active and stationary contacts, and an arc-extinguishing chamber. When the main and stationary contacts disconnect, an electric arc is generated. This arc is extinguished by arc-extinguishing grids installed within the arc-extinguishing chamber. Some arc extinguishing systems are equipped with arc-moving and stationary contacts, where the arc-moving and stationary contacts are located within the arc-extinguishing chamber. These contacts guide the electric arc generated after the circuit is broken into the arc-extinguishing chamber, thus protecting the active and stationary contacts.

[0003] Arc-stationary contacts are typically connected to the stationary conductive rod via a stationary arc-inducing plate. After the circuit is broken, sometimes the arc between the arc-stationary and stationary contacts may transfer along the stationary arc-inducing plate to the stationary conductive rod, and then to the main stationary contact on the rod, leading to disconnection failure. Furthermore, after the circuit is broken, when the voltage difference between the arc-stationary contact, the stationary conductive rod, and nearby conductors and circuit components reaches a certain level, arc jumping may occur between the arc-stationary contact and the stationary conductive rod, a phenomenon known as arc skipping. In severe cases, this can lead to equipment malfunction. Utility Model Content

[0004] The purpose of this invention is to provide a contact arc extinguishing system to solve the technical problems in the prior art where the electric arc between the moving and stationary contacts transfers along the stationary arc-inducing plate and the stationary conductive rod to the main stationary contact, and where arc jumping may occur between the moving and stationary contacts and the stationary conductive rod.

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

[0006] An arc-extinguishing system includes a stationary contact assembly and a moving contact assembly. The stationary contact assembly includes a stationary conductive rod, a main stationary contact disposed on the stationary conductive rod, and an arc stationary contact electrically connected to the stationary conductive rod. The moving contact assembly includes an active contact for contacting or separating from the main stationary contact and an arc moving contact for contacting or separating from the arc stationary contact. The arc-extinguishing system further includes an arc-isolating element and an anti-arc jump protrusion, wherein:

[0007] The arc-blocking component is provided with an arc-blocking channel, the arc-moving contact is disposed inside the arc-blocking channel, and the active contact is disposed outside the arc-blocking channel;

[0008] An opening is provided on the side of the arc-blocking channel near the stationary contact assembly. The anti-arc jump protrusion is inserted into the arc-blocking channel through the opening and is located between the stationary conductive rod and the arc stationary contact.

[0009] Furthermore, the anti-arc protrusion is higher than the main stationary contact;

[0010] And / or, the anti-jumping protrusion is a gas-generating component;

[0011] And / or, the anti-arc protrusion is made of one of the following materials: polytetrafluoroethylene, POM, melamine, and nylon.

[0012] Furthermore, it also includes an arc-extinguishing chamber, which has an arc-extinguishing cavity;

[0013] The stationary contact assembly also includes a stationary arc-inducing plate, one end of which is connected to the stationary conductive rod and the other end of which extends into the arc-extinguishing cavity. The stationary arc-inducing plate is provided with a first clearance notch for the anti-arc protrusion to pass through.

[0014] The stationary arc contact is disposed on the stationary arc-drawing plate and placed in the arc-extinguishing cavity, and one end of the moving arc contact that contacts the stationary arc contact passes through the arc-isolating channel and is placed in the arc-extinguishing cavity.

[0015] Furthermore, the arc-blocking component includes a first baffle, which is disposed between the active contact and the end face of the arc-extinguishing cavity, and has a gap with the end face of the arc-extinguishing cavity;

[0016] And / or, the arc-blocking member includes two second baffles, the gap between the two second baffles forming the arc-blocking channel;

[0017] And / or, the arc-blocking member includes a third baffle that covers at least a portion of the side of the stationary arc-drawing plate closest to the moving contact assembly.

[0018] Furthermore, the two second baffles are parallel to each other, and the first baffle, the second baffle, and the third baffle are perpendicular to each other and integrally formed;

[0019] The first baffle has a second clearance notch for the arcing contact to pass through;

[0020] The third baffle has the opening.

[0021] Furthermore, the anti-jumping protrusion is positioned between the two second baffles;

[0022] And / or, the static conductive rod is provided with a positioning groove, and the two second baffles extend into the positioning groove in a barb shape.

[0023] Furthermore, the contact arc extinguishing system is disposed within the circuit breaker housing;

[0024] The anti-arc protrusion is integrally formed with the housing, or the anti-arc protrusion is fixed in the housing by fasteners, or the anti-arc protrusion is snapped and fixed in the housing.

[0025] Furthermore, the contact arc extinguishing system is disposed within the circuit breaker housing;

[0026] The housing is provided with an installation cavity for installing the contact arc extinguishing system. The upper and lower walls of the installation cavity are respectively provided with a first positioning step surface and a second positioning step surface. The upper and lower ends of the arc extinguishing member are respectively in contact with the first positioning step surface and the second positioning step surface for positioning.

[0027] Furthermore, a positioning protrusion is provided inside the mounting cavity, and a positioning notch is provided on the arc-isolating member for insertion and positioning with the positioning protrusion.

[0028] Furthermore, the arc-blocking component includes a first baffle, which is laid flat in the mounting cavity and divides the mounting cavity into two sub-cavities. The first baffle has a second clearance notch that connects the two sub-cavities.

[0029] The static conductive rod, the main static contact, and the active contact are all disposed in one of the sub-cavities. The arc static contact is disposed in the other sub-cavity. One end of the arc moving contact is located in one of the sub-cavities, and the other end extends beyond the anti-jumping arc protrusion and into the other sub-cavity through the second clearance notch.

[0030] The beneficial effects of this utility model are:

[0031] The arc extinguishing system provided by this utility model includes a stationary contact assembly and a moving contact assembly. The stationary contact assembly includes a stationary conductive rod, a main stationary contact disposed on the stationary conductive rod, and an arc stationary contact electrically connected to the stationary conductive rod. The moving contact assembly includes an active contact and an arc moving contact. The arc extinguishing system also includes an arc-isolating component and an anti-arc jump protrusion. The arc-isolating component is provided with an arc-isolating channel, the arc moving contact is disposed within the arc-isolating channel, and the active contact is disposed outside the arc-isolating channel. An opening is provided on the side of the arc-isolating channel near the stationary contact assembly, and the anti-arc jump protrusion is inserted into the arc-isolating channel through the opening and is located between the stationary conductive rod and the arc stationary contact. After the circuit is disconnected, the arc-blocking channel of the above structure can block the arc and charged particles at the moving contact, preventing the arc and charged particles from transferring from the moving contact to the active contact. Thus, although a large number of charged particles accumulate between the moving and stationary contacts, these charged particles cannot move between the active and stationary contacts, thereby preventing the active and stationary contacts from being broken down and generating an arc, and improving the breaking performance. To prevent the arc accumulated between the moving and stationary contacts from causing arc jumping, this application provides an anti-arc jumping protrusion between the stationary conductive rod and the arc-stationary contact. The anti-arc jumping protrusion is made of an insulating material with ultra-high withstand voltage, which can effectively prevent the arc at the arc-stationary contact from jumping to the stationary conductive rod and its vicinity, thereby avoiding equipment failure caused by arc jumping. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 A top view of the assembly of the contact arc extinguishing system and the base plate of the housing provided in an embodiment of this utility model;

[0034] Figure 2 for Figure 1 Cross-sectional view at point AA when the circuit is connected;

[0035] Figure 3 for Figure 1 Cross-sectional view at AA when the circuit is disconnected;

[0036] Figure 4 A three-dimensional schematic diagram of the contact arc extinguishing system provided in the embodiments of this utility model;

[0037] Figure 5 A three-dimensional schematic diagram of the stationary contact assembly provided in an embodiment of this utility model;

[0038] Figure 6A three-dimensional schematic diagram of the arc-blocking component provided in this embodiment of the present invention at one angle;

[0039] Figure 7 A three-dimensional schematic diagram of the arc-blocking component provided in this embodiment of the present invention from another angle;

[0040] Figure 8 A cross-sectional view of the contact arc extinguishing system and the housing provided in an embodiment of this utility model;

[0041] Figure 9 A three-dimensional schematic diagram of the assembly of the contact arc extinguishing system and the housing provided for an embodiment of this utility model;

[0042] Figure 10 A three-dimensional schematic diagram of the assembly of the contact arc extinguishing system and the base plate of the housing provided in this embodiment of the utility model;

[0043] Figure 11 for Figure 10 Enlarged view at point B.

[0044] icon:

[0045] 100 - Static contact assembly; 110 - Static conductive rod; 111 - Positioning groove; 120 - Main static contact; 130 - Arc static contact; 140 - Static arc-inducing plate; 141 - First clearance notch; 142 - Connecting part; 143 - Arc-inducing part;

[0046] 200 - Moving contact assembly; 210 - Contact support; 220 - Active contact; 230 - Arcing contact;

[0047] 300 - Arc blocking component; 310 - Arc blocking channel; 320 - Through opening; 330 - First baffle; 340 - Second baffle; 350 - Third baffle; 360 - Second clearance notch; 370 - Positioning notch; 380 - Fourth baffle;

[0048] 400-Anti-jumping arc protrusion;

[0049] 500 - Arc-extinguishing chamber; 510 - Arc-extinguishing cavity;

[0050] 600 - Housing; 610 - First positioning step surface; 620 - Second positioning step surface; 630 - Positioning protrusion; 640 - First support platform; 650 - Second support platform. Detailed Implementation

[0051] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0052] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] It should be noted that in the description of this utility model, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] Reference Figure 1 and Figure 2 For an arc extinguishing system with an arc contact, the arc extinguishing system includes a stationary contact assembly 100 and a moving contact assembly 200. The stationary contact assembly 100 includes a stationary conductive rod 110, a main stationary contact 120 disposed on the stationary conductive rod 110, and an arc stationary contact 130 electrically connected to the stationary conductive rod 110. The moving contact assembly 200 includes an active contact 220 for contacting or separating from the main stationary contact 120 and an arc moving contact 230 for contacting or separating from the arc stationary contact 130. The specific working principle of the arcing contact 230 is as follows: When the circuit breaker is open, the moving contact assembly 200 moves relative to the stationary contact assembly 100. During the movement, the arcing contact 230 separates from the stationary contact assembly 100 after the active contact 220, so that an electric arc is generated on the arcing contact 230, thereby achieving the purpose of protecting the active contact 220. When the circuit breaker is closed, the moving contact assembly 200 moves relative to the stationary contact assembly 100. During the movement, the arcing contact 230 contacts the stationary contact assembly 100 before the active contact 220, thereby avoiding the generation of an electric arc on the main contact.

[0055] After the circuit is disconnected, because the arc stationary contact 130 is electrically connected to the stationary conductive rod 110, sometimes the electric arc between the arcing and stationary contacts may transfer to the stationary conductive rod 110, and then to the main stationary contact 120 on the stationary conductive rod 110, leading to disconnection failure. Furthermore, after the circuit is disconnected, a large number of charged particles and electric arcs accumulate between the arcing and stationary contacts. When the voltage difference between the arc stationary contact 130 and the stationary conductive rod 110, and the conductors and circuit components near the stationary conductive rod 110, reaches a certain level, arc jumping may occur between the arc stationary contact 130 and the stationary conductive rod 110, causing the electric arc at the arc stationary contact 130 to jump to the stationary conductive rod 110 and its vicinity. In severe cases, this can lead to equipment failure.

[0056] Based on this, refer to Figure 2 and Figure 3 The contact arc extinguishing system provided in this application also includes an arc-blocking element 300 and an anti-arc jump protrusion 400, wherein:

[0057] The arc-blocking component 300 is provided with an arc-blocking channel 310, the arc-moving contact 230 is disposed inside the arc-blocking channel 310, and the active contact 220 is disposed outside the arc-blocking channel 310;

[0058] An opening 320 is provided on the side of the arc-blocking channel 310 near the stationary contact assembly 100. The anti-arc jump protrusion 400 is inserted into the arc-blocking channel 310 through the opening 320 and is located between the stationary conductive rod 110 and the arc stationary contact 130.

[0059] After the circuit is disconnected, the arcing contact 230 separates from the stationary contact assembly 100 after the active contact 220. The arc and charged particles gather between the arcing stationary contact 130 and the arcing contact 230. Since the arcing contact 230 and the active contact 220 are located on the inner and outer sides of the arc-blocking channel 310, the arc-blocking channel 310 can block the arc and charged particles at the arcing contact 230, preventing the arc and charged particles from transferring from the arcing contact 230 to the active contact 220. Thus, although a large number of charged particles gather between the arcing and stationary contacts, these charged particles cannot move between the active and stationary contacts, thereby preventing the active and stationary contacts from being broken down and generating an arc, and improving the breaking performance. Furthermore, in order to avoid arc jumping caused by the electric arc accumulating between the moving and stationary contacts, this application provides an anti-arc jumping protrusion 400 between the stationary conductive rod 110 and the arc stationary contact 130. The anti-arc jumping protrusion 400 is made of an insulating material with ultra-high withstand voltage value, which can effectively prevent the electric arc at the arc stationary contact 130 from jumping to the stationary conductive rod 110 and its vicinity, thereby avoiding equipment failure caused by arc jumping.

[0060] In some embodiments, refer to Figure 2 and Figure 3The anti-arc protrusion is 400mm higher than the main stationary contact by 120mm. Figure 2 and Figure 3 In the illustrated embodiment, the main stationary contact 120 is fixed to the top surface of the stationary conductive rod 110. Since the anti-arc-jumping protrusion 400 is higher than the main stationary contact 120, it is also necessarily higher than the stationary conductive rod 110. This creates a relatively high barrier between the stationary conductive rod 110 and the arc-stopped contact 130, thereby blocking arcing. Furthermore, the anti-arc-jumping protrusion 400 is higher than both the stationary conductive rod 110 and the arc-stopped contact 130 to enhance the arc-blocking effect. The arc-moving contact 230 has a recessed surface opposite the anti-arc-jumping protrusion 400 to prevent interference between the arc-moving contact 230 and the anti-arc-jumping protrusion 400 when the arc-moving contact 230 contacts the arc-stopped contact 130.

[0061] In some embodiments, the anti-arc jump protrusion 400 is a gas-generating component. For example, the anti-arc jump protrusion 400 is made of gas-generating materials such as polytetrafluoroethylene, nylon, POM, and melamine. When the circuit is broken, at the moment the arcing moving and stationary contacts open, the lower arc will cause the anti-arc jump protrusion 400 to vaporize and generate a certain amount of gas. Under the action of the pressure difference inside and outside the circuit breaker, this gas moves away from the stationary conductive rod 110, thereby blowing the arc and charged particles between the arcing moving and stationary contacts away from the stationary conductive rod 110. This not only prevents the arc between the arcing moving and stationary contacts from transferring to the stationary conductive rod 110 through the conductor, but also prevents the arc at the arcing stationary contact 130 from jumping to the stationary conductive rod 110 and its vicinity. Furthermore, the gas generated by the anti-arc jump protrusion 400 can also enhance the insulation between the arcing stationary contact 130 and the stationary conductive rod 110.

[0062] In some embodiments, refer to Figure 4 and Figure 5 The contact arc extinguishing system also includes an arc extinguishing chamber 500, which has an arc extinguishing cavity 510; the stationary contact assembly 100 also includes a stationary arc-inducing plate 140, one end of which is connected to the stationary conductive rod 110 and the other end extends into the arc extinguishing cavity 510, and the stationary arc-inducing plate 140 is provided with a first clearance notch 141 for the anti-arc protrusion 400 to pass through; the arc stationary contact 130 is disposed on the stationary arc-inducing plate 140 and placed in the arc extinguishing cavity 510, and one end of the contact arc stationary contact 130 of the arc-moving contact 230 passes through the arc isolation channel 310 and is placed in the arc extinguishing cavity 510.

[0063] Specifically, the arc-extinguishing chamber 500 includes two spaced-apart gas-generating elements and a grid assembly. At least a portion of the grids in the grid assembly form a U-shaped structure with a grid belly and two grid legs. The two grid legs are respectively inserted into the two gas-generating elements. Thus, the two gas-generating elements and the grid assembly enclose an arc-extinguishing cavity 510. The side of the arc-extinguishing cavity 510 away from the grid assembly forms an opening facing the moving contact assembly 200. The two gas-generating elements respectively form the two side walls of the arc-extinguishing cavity 510 and are located on opposite sides of the arc-moving contact 230. The end face of the arc-extinguishing cavity 510 is the side opposite to the active contact 220, which is the side of the arc-extinguishing cavity 510 facing the moving contact assembly 200. Since the active and stationary contacts are located outside the arc-extinguishing cavity 510, while the arc-moving and stationary contacts are located inside the arc-extinguishing cavity 510, the arc generated when the circuit breaker trips is generated within the arc-extinguishing cavity 510.

[0064] Continue to refer to Figure 4 The moving contact assembly 200 also includes a contact support 210, on which the active contact 220 and the arcing contact 230 are mounted side-by-side. The number of active contacts 220 and arcing contacts 230 can be one, two, or more. Generally, the number of active contacts 220 is greater than the number of arcing contacts 230, and the multiple active contacts 220 are divided into two groups and respectively disposed on both sides of the arcing contact 230. The arc-quenching channel 310 extends from the opening on the end face of the arc-extinguishing cavity 510 towards the contact support 210, separating the active contact 220 and the arcing contact 230.

[0065] In some embodiments, refer to Figure 4 , Figure 6 and Figure 7 The arc-isolating component 300 includes a first baffle 330, which is disposed between the end faces of the active contact 220 and the arc-extinguishing cavity 510, and has a gap between them. During operation, when the current is interrupted, a large amount of gas carrying the arc and charged particles exists within the arc-extinguishing cavity 510. This gas inevitably overflows from the opening of the arc-extinguishing cavity 510 towards the moving contact assembly 200. The overflowing gas flows into the gap between the first baffle 330 and the end face of the arc-extinguishing cavity 510, allowing for timely pressure relief of the arc-extinguishing cavity 510. This prevents the gas from impacting the moving and stationary contacts in the reverse direction, thus avoiding damage to the moving and stationary contacts or continued arc burning, and improving the breaking performance of the arc-extinguishing system.

[0066] In some embodiments, the arc-blocking member 300 includes two second baffles 340, and the gap between the two second baffles 340 forms an arc-blocking channel 310.

[0067] In some embodiments, the arc-blocking member 300 includes a third baffle 350 covering at least a portion of the stationary arc-inducing plate 140 near the moving contact assembly 200. In this embodiment, the stationary arc-inducing plate 140 includes a connecting portion 142 and an arc-inducing portion 143. The connecting portion 142 connects the arc-inducing portion 143 and the stationary conductive rod 110. The arc-inducing portion 143 is at least partially located within the arc-extinguishing chamber 500, and an arc-stationary contact 130 is provided on the arc-inducing portion 143, which is also located within the arc-extinguishing chamber 500. The end of the arc-inducing portion 143 away from the main stationary contact 120 extends to the outside of the grid assembly end and is located outside the arc-extinguishing chamber 500, while the remaining portion of the arc-inducing portion 143 is located within the arc-extinguishing chamber 500. The third baffle 350 covers the connecting portion 142. The connecting part 142 mainly serves to connect the arc-initiating part 143 and the stationary conductive rod 110 to connect the arc stationary contact 130 to the circuit; the arc-initiating part 143 serves to introduce the electric arc at the arc-moving and stationary contacts into the arc-extinguishing chamber 500.

[0068] Reference Figure 6 and Figure 7 In the embodiment where the arc-blocking member 300 includes a first baffle 330, a second baffle 340, and a third baffle 350, the two second baffles 340 are parallel to each other, and the first baffle 330, the second baffle 340, and the third baffle 350 are perpendicular to each other and integrally formed. Each second baffle 340 extends from the first baffle 330 toward the contact support member 210 and is located on both sides of the arcing contact 230. One of the second baffles 340, the first baffle 330, and the third baffle 350 form a protective area, and the other two second baffles 340, the first baffle 330, and the third baffle 350 form a protective area. One end of the main stationary contact 120 of the active contact 220 moves within this protective area. Further, the first baffle 330 has a second clearance notch 360 for the arcing contact 230 to pass through; the third baffle 350 has a through-hole 320.

[0069] In some embodiments, continue to refer to Figure 3 The stationary conductive rod 110 is provided with a positioning groove 111, and two second baffles 340 extend into the positioning groove 111 in a barb shape. The positioning groove 111 serves two purposes: firstly, to position and install the arc-blocking component 300; and secondly, to increase the height difference between the stationary conductive rod 110 and the anti-arc jump protrusion 400, thereby further preventing the arc at the arc-blocking contact 130 from jumping over the anti-arc jump protrusion 400 onto the stationary conductive rod 110.

[0070] In some embodiments, refer to Figure 8 and Figure 9 , Figure 9The housing 600 shown contains two contact arc extinguishing systems. To facilitate viewing the structure of the housing 600, one of the contact arc extinguishing systems has been removed. As shown in the figure, the housing 600 has a mounting cavity for installing the contact arc extinguishing system. The upper and lower walls of the mounting cavity are respectively provided with a first positioning step surface 610 and a second positioning step surface 620. The upper and lower ends of the arc-isolating member 300 are in contact with the first positioning step surface 610 and the second positioning step surface 620 for positioning.

[0071] Specifically, the housing 600 includes a base plate and a base, which are fastened together and enclose a mounting cavity between them. Based on the above structure, refer to... Figure 10 and Figure 11 Inside the housing 600 (specifically on the bottom plate), there is a first support platform 640 for supporting the connecting part 142. The connecting part 142 is wrapped between the third baffle 350 and the first support platform 640. A second positioning step surface 620 is provided on the side of the first support platform 640 near the arc-extinguishing chamber 500. A fourth baffle 380 is erected on the side of the third baffle 350 opposite to the first baffle 330. The fourth baffle 380 is attached to the second positioning step surface 620.

[0072] In some embodiments, to improve the stability of the stationary arc-drawing plate 140, a second support platform 650 for supporting the arc-drawing part 143 is provided inside the housing 600. The stationary arc-drawing plate 140 can be fixed to the first support platform 640 and / or the second support platform 650 by fasteners such as screws and locating pins.

[0073] In some embodiments, continue to refer to Figure 9 The mounting cavity is provided with a positioning protrusion 630, and the arc-isolating component 300 is provided with a positioning notch 370 for insertion and positioning with the positioning protrusion 630. In this embodiment, the top of the base is provided with a first positioning step surface 610, and a positioning protrusion 630 is provided at each end of the first positioning step surface 610. The upper end of the first baffle 330 is attached to the first positioning step surface 610, and a positioning notch 370 is provided on each side of the first baffle 330. The two positioning protrusions 630 are respectively inserted and engaged with the two positioning notches 370.

[0074] Reference Figure 9When installing the arc-blocking component 300, the base plate and the base are not fully engaged. The arc-blocking component 300 can be pushed into the mounting cavity from the outside until the upper and lower ends of the arc-blocking component 300 contact and are positioned with the first positioning step surface 610 and the second positioning step surface 620, respectively. At the same time, the two positioning protrusions 630 are respectively engaged with the two positioning notches 370. Then, fastening screws, pins and other fasteners makes the base plate and the base fully engaged. At this time, the lower end face of the fourth baffle 380 is limited by the side of the base plate perpendicular to the second positioning step surface 620, and the lower end faces of the two positioning notches 370 are contacted and limited by the lower end faces of the two positioning protrusions 630 (that is, there is no gap between the lower end faces of the two positioning notches 370 and the lower end faces of the two positioning protrusions 630). This makes the arc-blocking component 300 clamped by the side of the base plate perpendicular to the second positioning step surface 620 and the lower end faces of the positioning protrusions 630, thus realizing the installation and fixation of the arc-blocking component 300 in all directions. Meanwhile, the barbed protrusion on the side of the second baffle 340 away from the fourth baffle 380 is inserted into the positioning groove 111.

[0075] Continue to refer to Figure 8 and Figure 9 The first baffle 330 of the arc-isolating component 300 is laid flat in the mounting cavity and divides the mounting cavity into two sub-cavities. A second clearance notch 360 connecting the two sub-cavities is opened on the first baffle 330. The static conductive rod 110, the main static contact 120, and the active contact 220 are all arranged in one of the sub-cavities. Figure 8 The arc-stationary contact 130 and the arc-extinguishing chamber 500 are both located in another secondary cavity (right side secondary cavity). Figure 8 The arcing contact 230 is located in one of the secondary cavities (left side), with one end of the arcing contact 230 located in one of the secondary cavities and the other end extending beyond the anti-arc protrusion 400 and into the other secondary cavity through the second clearance notch 360. Furthermore, a stepped surface can be provided around the mounting cavity at the position of the first baffle 330. This stepped surface fits snugly against the first baffle 330, allowing for both positioning and installation of the first baffle 330, and improving the sealing of the periphery of the first baffle 330. This prevents the arc and charged particles in the secondary cavity containing the arcing contact, stationary contact, and arc-extinguishing chamber 500 from easily transferring to the other secondary cavity.

[0076] In addition to the installation methods described above, the arc-isolating component 300 can also be fixed to the housing 600 by screws or other fasteners.

[0077] As an optional embodiment, the anti-arc protrusion 400 is integrally formed with the housing 600, or the anti-arc protrusion 400 is fixed in the housing 600 by fasteners, or the anti-arc protrusion 400 is snapped and fixed in the housing 600.

[0078] In embodiments where the anti-arc protrusion 400 is a gas-generating component, the anti-arc protrusion 400 is detachably fixed within the housing 600 by means of fasteners or snap-fits. Preferably, the anti-arc protrusion 400 is snap-fit ​​fixed within the housing 600, which simplifies the installation process and avoids the use of metal parts on the anti-arc protrusion 400.

[0079] Reference Figure 11 ,exist Figure 11 In the illustrated embodiment, a third stepped surface is formed on the side of the first support platform 640 away from the arc-extinguishing chamber 500. The third stepped surface includes two vertically connected planes, each with a positioning protrusion. The anti-arc jump protrusion 400 is L-shaped, with positioning grooves on its two vertical inner planes. The positioning protrusions slide into the positioning grooves from left to right (or from right to left) in a corresponding manner, thereby limiting the displacement of the anti-arc jump protrusion 400 relative to the housing 600 in the vertical and horizontal directions. Based on the above structure, the anti-arc jump protrusion 400 is engaged between the two second baffles 340. After the arc-isolating component 300 is installed into the housing 600, the anti-arc jump protrusion 400 is engaged between the two second baffles 340, which restrict the displacement of the anti-arc jump protrusion 400 in the horizontal direction, thus achieving the installation and fixation of the anti-arc jump protrusion 400 in all directions.

[0080] In summary, the contact arc extinguishing system provided in this embodiment includes an arc-isolating component 300 and an anti-arc jump protrusion 400. The arc-isolating component 300 is provided with an arc-isolating channel 310 for separating the main and arc-moving contacts, effectively preventing most of the arc from overflowing backwards from the opening of the arc extinguishing chamber 510 to between the active and stationary contacts. The anti-arc jump protrusion 400 is located within the arc-isolating channel 310 and between the stationary conductive rod 110 and the arc-stationary contact 130. The anti-arc jump protrusion 400 can be a gas-generating component, capable of generating a certain amount of gas at the moment the arc-moving and stationary contacts open. This gas can both hinder the reverse movement of the arc and charged particles between the arc-moving and stationary contacts and blow the arc and charged particles into the arc extinguishing chamber 500, while also preventing arc jumps between the arc-stationary contact 130 and the stationary conductive rod 110, thereby improving the breaking and safety performance of the contact arc extinguishing system.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A contact arc extinguishing system, comprising a stationary contact assembly (100) and a moving contact assembly (200), wherein the stationary contact assembly (100) includes a stationary conductive rod (110), a main stationary contact (120) disposed on the stationary conductive rod (110), and an arc stationary contact (130) electrically connected to the stationary conductive rod (110); the moving contact assembly (200) includes an active contact (220) for contacting or separating from the main stationary contact (120) and an arc moving contact (230) for contacting or separating from the arc stationary contact (130); characterized in that, The arc-extinguishing system further includes an arc-isolating component (300) and an anti-arc-jumping protrusion (400), wherein: The arc-blocking component (300) is provided with an arc-blocking channel (310), the arc-moving contact (230) is disposed inside the arc-blocking channel (310), and the active contact (220) is disposed outside the arc-blocking channel (310); The arc-blocking channel (310) has an opening (320) on one side near the stationary contact assembly (100). The anti-arc jump protrusion (400) is inserted into the arc-blocking channel (310) through the opening (320) and is located between the stationary conductive rod (110) and the arc stationary contact (130).

2. The contact arc extinguishing system according to claim 1, characterized in that, The anti-jumping protrusion (400) is higher than the main stationary contact (120); And / or, the anti-arc protrusion (400) is a gas-generating component; And / or, the anti-arc protrusion (400) is made of one of the following materials: polytetrafluoroethylene, POM, melamine, and nylon.

3. The contact arc extinguishing system according to claim 1, characterized in that, It also includes an arc-extinguishing chamber (500), which has an arc-extinguishing cavity (510); The stationary contact assembly (100) further includes a stationary arc-inducing plate (140), one end of which is connected to the stationary conductive rod (110) and the other end extends into the arc-extinguishing cavity (510). The stationary arc-inducing plate (140) is provided with a first clearance notch (141) through which the anti-arc protrusion (400) passes. The stationary arc contact (130) is disposed on the stationary arc-drawing plate (140) and placed inside the arc-extinguishing cavity (510). One end of the arc-moving contact (230) that contacts the stationary arc contact (130) extends out from the arc-isolating channel (310) and is placed inside the arc-extinguishing cavity (510).

4. The contact arc extinguishing system according to claim 3, characterized in that, The arc-blocking component (300) includes a first baffle (330), which is disposed between the end face of the active contact (220) and the arc-extinguishing cavity (510) and has a gap with the end face of the arc-extinguishing cavity (510). And / or, the arc-blocking member (300) includes two second baffles (340), the gap between the two second baffles (340) forming the arc-blocking channel (310); And / or, the arc-blocking member (300) includes a third baffle (350) that covers at least a portion of the side of the stationary arc-drawing plate (140) near the moving contact assembly (200).

5. The contact arc extinguishing system according to claim 4, characterized in that, The two second baffles (340) are parallel to each other, and the first baffle (330), the second baffle (340) and the third baffle (350) are perpendicular to each other and integrally formed; The first baffle (330) has a second clearance notch (360) for the arcing contact (230) to pass through; The third baffle (350) has the opening (320).

6. The contact arc extinguishing system according to claim 5, characterized in that, The anti-jumping arc protrusion (400) is positioned between the two second baffles (340); And / or, the static conductive rod (110) is provided with a positioning groove (111), and the two second baffles (340) extend into the positioning groove (111) in a barb shape.

7. The contact arc extinguishing system according to claim 1, characterized in that, The contact arc extinguishing system is installed inside the circuit breaker housing (600); The anti-arc protrusion (400) is integrally formed with the housing (600), or the anti-arc protrusion (400) is fixed in the housing (600) by fasteners, or the anti-arc protrusion (400) is snapped and fixed in the housing (600).

8. The contact arc extinguishing system according to claim 1, characterized in that, The contact arc extinguishing system is installed inside the circuit breaker housing (600); The housing (600) is provided with an installation cavity for installing the contact arc extinguishing system. The upper and lower walls of the installation cavity are respectively provided with a first positioning step surface (610) and a second positioning step surface (620). The upper and lower ends of the arc extinguishing member (300) are respectively in contact with the first positioning step surface (610) and the second positioning step surface (620) for positioning.

9. The contact arc extinguishing system according to claim 8, characterized in that, The mounting cavity is provided with a positioning protrusion (630), and the arc-blocking member (300) is provided with a positioning notch (370) for insertion and positioning with the positioning protrusion (630).

10. The contact arc extinguishing system according to claim 8, characterized in that, The arc-blocking component (300) includes a first baffle (330), which is laid flat in the mounting cavity and divides the mounting cavity into two sub-cavities. A second clearance notch (360) is provided on the first baffle (330) to connect the two sub-cavities. The static conductive rod (110), the main static contact (120), and the active contact (220) are all disposed in one of the sub-cavities. The arc static contact (130) is disposed in the other sub-cavity. One end of the arc moving contact (230) is located in one of the sub-cavities, and the other end extends beyond the anti-jumping arc protrusion (400) and into the other sub-cavity through the second clearance notch (360).

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