Arc extinguishing device of electric switch

Abstract

The invention provides an arc extinguishing device of an electric switch, which at least comprises a static contact assembly, a moving contact assembly, an iron core assembly, N arc extinguishing grid sheets and a power supply wiring terminal, an arc striking piece is arranged on the static contact assembly or the iron core assembly, and the arc striking piece and the static contact assembly or the iron core assembly are integrally arranged, or the arc striking piece and the static contact assembly or the iron core assembly are arranged in a split mode and are arranged next to the iron core assembly, the arc striking piece obliquely extends towards the power supply wiring end by taking the tail end of the static contact assembly as a starting point, an electric arc is generated during short circuit breaking, and the electric arc rapidly jumps to the arc striking piece from the static contact assembly under the action of the magnetic field force of the arc striking piece to complete the first jump; the electric arc continues to be sprayed to the N arc extinguishing grid pieces to enable air to be free, the electric arc jumps from the arc striking piece to the power supply terminal arc striking piece to complete second-time jumping, the electric arc is connected between the power supply terminal arc striking piece and the N arc extinguishing grid pieces and the moving contact arc striking piece after two-time jumping, the electric arc voltage is increased, and the air is discharged. And free gas is cooled by the arc extinguishing grid sheets for deionization and arc extinguishing.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to an arc-extinguishing device for an electrical switch. Background Technology

[0002] The existing arc-extinguishing device of a switch is basically composed of an arc-extinguishing chamber, a moving contact, a stationary contact, a stationary contact arc-inducing plate, and a moving contact arc-inducing plate. One end of the stationary contact arc-inducing plate is electrically connected to the stationary contact, and the other end is arc-shaped and extends to one side of the arc-extinguishing chamber. One end of the moving contact arc-inducing plate is connected to the outgoing terminal, and the other end is arc-shaped and extends to the other side of the arc-extinguishing chamber through an arc-running track. The arc is introduced into the arc-extinguishing chamber through the arc-running track formed between the stationary and moving contact arc-inducing plates. The principle is to use the Lorentz force generated by the reverse current between the moving and stationary contacts to extinguish the arc. The thrust causes the arc to transfer from the stationary contact to the stationary contact arc-inducing plate, causing the arc on the moving contact to jump to the moving contact arc-inducing plate. Then, the arc connects between the moving and stationary contact arc-inducing plates and moves towards the arc-extinguishing chamber within the arc path. Because the arc-extinguishing chamber is far from the place where the arc is generated by the moving and stationary contacts, the arc's path is long, and the arc-extinguishing chamber has a large span, the Lorentz force is weakened, the arc enters the arc-extinguishing chamber at a slower speed, and the arc energy rises sharply, causing severe burn-out of the internal components of the switch or failing to meet the requirements of high breaking capacity. Summary of the Invention

[0003] Based on the above background, the present invention provides an arc-extinguishing device for an electrical switch. The arc-initiating element is made of ferromagnetic material and is disposed adjacent to or integrally with the iron core assembly. The stationary contact assembly has a current-carrying conductor section surrounding the iron core assembly. When current flows, the iron core assembly and the arc-initiating element are magnetized by an induced magnetic field, forming an electromagnet. The magnetic force generated on the arc-initiating element attracts the arc, causing the arc to quickly jump from the stationary contact assembly to the arc-initiating element. Furthermore, through the equipotential connection between the power supply terminal arc-initiating plate and the power supply terminal, the power supply terminal arc-initiating plate is placed in the arc-extinguishing chamber. On one side, the electric arc is attracted by electromagnetic force and ejected into the arc-extinguishing chamber, ionizing the air inside. This causes the arc to rapidly jump towards the arc-initiating plate at the power supply terminal. Through two rapid jumps, one end of the arc breaks through each arc-extinguishing grid plate in the arc-extinguishing chamber from the arc-initiating plate at the power supply terminal and then connects with the arc-initiating plate of the moving contact, dividing the arc into several short arcs connected in series. This causes the arc voltage drop to rise rapidly above the system recovery voltage, and the arc is quickly extinguished. By extinguishing the arc through arc jumping, the speed at which the arc enters the arc-extinguishing chamber is effectively increased, significantly improving the breaking capacity of the switch and overcoming the aforementioned problems.

[0004] This application discloses an arc-extinguishing device for an electrical switch. The arc-extinguishing device is disposed within the insulating housing of the switch and includes at least a stationary contact assembly, a moving contact assembly, an iron core assembly, N arc-extinguishing grid plates, and a power supply terminal. An arc-inducing element is provided on the stationary contact assembly or the iron core assembly. The arc-inducing element is integrally disposed with the stationary contact assembly or the iron core assembly, or the arc-inducing element is separately disposed from the stationary contact assembly or the iron core assembly and disposed adjacent to the iron core assembly. The arc-inducing element extends obliquely towards the power supply terminal from the end of the stationary contact assembly. The stationary contact assembly is disposed on the outer periphery of the iron core assembly. The arc-inducing element is made of a magnetically conductive material. When current flows through the stationary contact assembly, it causes the iron core assembly to generate a magnetic field. The magnetic field generated by the iron core assembly is directly or indirectly transmitted to the arc-inducing element. When the moving contact assembly and the stationary contact assembly are electrically separated, the resulting arc is attracted by the magnetic field on the arc-inducing element.

[0005] In the above embodiments, the arc-starting element is made of magnetic material and is integrally or adjacent to the iron core assembly. When current flows through the electrical switch, the iron core assembly, as a magnetic element for magnetic short-circuit protection, is affected by the induced magnetic field. Both the iron core assembly and the arc-starting element have magnetic fields. The magnitude of the magnetic field is proportional to the magnitude of the current flowing through the electrical switch. When a short-circuit fault is interrupted, the current flowing through the electrical switch increases exponentially. The iron core assembly and the arc-starting element are affected by the induced magnetic field and generate a stronger magnetic field. The arc generated when the moving contact assembly and the stationary contact assembly open is driven by the magnetic field on the arc-starting element, causing it to quickly jump from the stationary contact assembly to the arc-starting element, reducing the residence time of the arc on the stationary contact assembly.

[0006] In some embodiments, one end of the stationary contact assembly is electrically connected to the power supply terminal, the middle section is a conductor section, and the end is a contact portion, which is provided with alloy contacts.

[0007] In the above embodiment, the stationary contact assembly carries the electrical energy of the switch, one end of which is electrically connected to the power supply terminal, and the other end is provided with a contact part and an alloy contact point, which is used to perform opening or closing actions with the moving contact assembly to realize the opening and closing of the electricity.

[0008] In some embodiments, the conductor segment is arranged to partially or fully surround the outer periphery of the core assembly, and a magnetic field is generated on the core assembly when current flows through the conductor segment.

[0009] In the above embodiments, the conductor segment on the stationary contact assembly is arranged around the iron core assembly. When current passes through the conductor segment, an induced magnetic field is generated, which magnetizes the iron core assembly to form an electromagnet. Semi-encirclement or partial encirclement can realize the output of the magnetic field of the conductor segment to the iron core assembly and the arc-starting component. The output of the magnetic field is related to the magnitude of the current and the length of the conductor segment around the iron core assembly. The larger the current and the longer the encirclement, the stronger the magnetic field and the better the arc-starting effect.

[0010] In some embodiments, when the arc-starting element and the core assembly are separately arranged, the arc-starting element is disposed on the opposite side of the alloy contact on the contact portion of the stationary contact assembly or at the end of the contact portion, and is disposed close to the core assembly and the contact portion, and the magnetic field generated by the core assembly is conducted to the arc-starting element.

[0011] In the above embodiments, the arc-initiating element is disposed on the opposite side of the welded alloy contact of the stationary contact assembly or at the end of the contact portion, and is disposed close to the core assembly. When the core assembly is magnetized, the arc-initiating element, being made of ferromagnetic material, will also be magnetized. The magnetized arc-initiating element will quickly attract the arc generated between the moving contact assembly and the stationary contact assembly during the breaking process, causing the arc to quickly detach from the moving contact assembly and the stationary contact assembly, protecting the moving contact assembly and the stationary contact assembly from excessive burning by the arc, and improving the breaking capacity of the electrical switch.

[0012] In some embodiments, when the core assembly and the arc-starting element are integrally arranged, the core assembly is composed of multiple magnetically conductive metal sheets stacked together, with at least one sheet in the middle being integrally arranged with the arc-starting element, and the arc-starting element and the core assembly together generate a magnetic field.

[0013] In the above embodiments, a large part of the magnetic field on the arc-starting component comes from the iron core assembly. By integrating the arc-starting component with the iron core assembly, the magnetic field conduction is more direct and efficient. The iron core assembly is combined in a layered manner, and its height is greater than that of the arc-starting component. When integrated, only one or a few iron core pieces in the middle need to be provided with arc-starting component features, which can also play the role of arc-starting component, and the magnetic attraction effect is better.

[0014] In some embodiments, when the arc-initiating element is integrated with the stationary contact assembly, the arc-initiating element is an extension structure on the contact portion of the stationary contact assembly, the arc-initiating element is disposed close to the core assembly, and the magnetic field generated by the core assembly is conducted to the arc-initiating element.

[0015] In the above embodiments, the arc-initiating element is integrated with the stationary contact assembly and is an extension structure on the contact portion of the stationary contact. The arc-initiating element is made of magnetic material and is disposed close to the iron core assembly. When a short-circuit current occurs, the iron core assembly is magnetized. At the same time, because the arc-initiating element is made of magnetic material and is disposed close to the iron core assembly, it can effectively conduct the magnetic field generated by the iron core assembly to attract the electric arc. The arc-initiating element and the stationary contact assembly are integrated, and the conductivity between them is good. After the electric arc jumps, the Lorentz force is generated more significantly, which is more conducive to the rapid movement of the electric arc.

[0016] In some embodiments, when the arc-initiating element and the stationary contact are separately configured, the arc-initiating element is disposed on the opposite side of the alloy contact on the contact portion of the stationary contact assembly or at the end of the contact portion, and is disposed close to the core assembly and the contact portion. The arc-initiating element and the stationary contact assembly are electrically connected, and the magnetic field generated by the core assembly is conducted to the arc-initiating element.

[0017] In the above embodiment, the arc-initiating element is an independent arc-initiating element, which is disposed close to the opposite side of the alloy contact on the contact portion of the stationary contact assembly or the end of the contact portion, and is also disposed close to the iron core assembly. When a short-circuit current occurs, the iron core assembly is magnetized, and since the arc-initiating element is made of magnetic material and is disposed close to the iron core assembly, it can effectively conduct the magnetic field generated by the iron core assembly to attract the electric arc. The arc-initiating element is disposed close to and electrically connected to the stationary contact assembly, and the two are conductive. After the electric arc jumps, the Lorentz force is generated more significantly, which is more conducive to the rapid movement of the electric arc.

[0018] In some embodiments, when the core assembly and the arc-starting element are separately arranged, the core assembly is made of stacked sheet-like magnetic conductive metal parts or an integral magnetic conductive columnar metal part. The arc-starting element is arranged on the opposite side of the alloy contact on the contact portion of the stationary contact assembly or at the end of the contact portion, close to the core assembly and the contact portion. The magnetic field generated by the core assembly is conducted to the arc-starting element.

[0019] In the above embodiments, the core assembly can be made of stacked sheet cores or columnar magnetic metal parts. The arc-starting element is made of a metal that is both conductive and magnetic. The arc-starting element is set close to the core assembly. When the core assembly is magnetized by the induced magnetic field and generates a magnetic field, the arc-starting element will conduct the magnetic field on the core assembly so that the magnetic field acts on the electric arc between the moving contact assembly and the stationary contact assembly.

[0020] In some embodiments, when the conductor segment is arranged to fully surround the outer periphery of the core assembly, the conductor segment through which the current flows in the stationary contact assembly has a spiral structure that surrounds the core assembly at least once.

[0021] In the above embodiments, the conductor segment of the stationary contact assembly has a spiral structure and can be arranged in multiple turns around the iron core assembly. The more turns the conductor segment has around the iron core assembly, the stronger the magnetic field force of the iron core assembly and the arc-starting component, and the better the arc-starting effect.

[0022] In some embodiments, the arc extinguishing device further includes a load terminal, and the load terminal is provided with a moving contact arc-inducing piece electrically connected thereto. The moving contact arc-inducing piece is disposed adjacent to one side of the arc extinguishing grid and extends toward the maximum open position of the moving contact assembly.

[0023] In the above embodiment, the load terminal is the electrical switch output terminal, used to connect to external wires to distribute electrical energy. The moving contact arc igniter is used to allow the electric arc on the moving contact to jump to it as soon as possible, thereby shortening the residence time of the electric arc on the moving contact assembly. The moving contact assembly is electrically connected to the load terminal, and the moving contact arc igniter is electrically connected to the load terminal, forming an equipotential setting with the moving contact assembly, which facilitates the rapid jump of the electric arc.

[0024] In some embodiments, the power terminal is further provided with a power terminal arc-inducing piece, one end of which is electrically connected to the power terminal or the stationary contact assembly, and the other end extends toward one side of the arc-extinguishing grid and is disposed near the arc-extinguishing grid.

[0025] In the above embodiments, the power supply terminal is the input terminal of the electrical switch, used to connect to an external power source. The power supply terminal is electrically connected to the stationary contact assembly. The arc-inducing piece of the power supply terminal is directly or indirectly electrically connected to the power supply terminal, and forms an equipotential relationship with the stationary contact assembly and the arc-inducing element, so that the arc can jump from the arc-inducing element to the arc-inducing piece of the power supply terminal.

[0026] In some embodiments, N is greater than or equal to 6, and N arc-extinguishing grid plates are arranged at intervals between the moving contact arc-inducing plate and the power supply terminal arc-inducing plate.

[0027] In the above embodiment, a power supply terminal arc-initiating plate electrically connected to the power supply terminal is provided on one side of the arc-extinguishing chamber, and a moving contact arc-initiating plate electrically connected to the load terminal is provided on the other side. The arc-initiating element is inclined to the lower left and extends towards the power supply terminal arc-initiating plate. Under the action of the magnetic force of the arc-initiating element, the arc is ejected towards the arc-extinguishing grid plate and the power supply terminal arc-initiating plate. Since the power supply terminal arc-initiating plate and the power supply terminal are connected at the same potential, the ionized gas generated by the arc combustion is sprayed towards the arc-extinguishing grid plate and the power supply terminal arc-initiating plate, causing the arc to be induced towards the power supply terminal. When the arc plate jumps, the entire arc circuit is connected to the moving contact arc plate through the arc-initiating plate at the power supply terminal and each arc-extinguishing grid plate in the arc-extinguishing chamber. The more arc-extinguishing grid plates there are, the better the cooling effect on the number of arc segments. Within a limited volume, the more the better. This arrangement stretches the arc length to its maximum and cuts it into the most segments. At this moment, the arc voltage rises sharply and exceeds the system recovery voltage, causing the arc to extinguish rapidly. The arc enters the arc-extinguishing chamber through two jumps, significantly shortening the breaking time and limiting the energy generated by short-circuit breaking.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. By placing the arc-starting element close to the core assembly, the stationary contact assembly generates a magnetic field on the core assembly when it is energized. At the same time, the arc-starting element placed close to the core assembly is also subjected to the induced magnetic field generated by the stationary contact assembly when it is energized. After being magnetized, the arc-starting element becomes magnetic and has a magnetic attraction effect on the electric arc generated between the moving and stationary contacts. This accelerates the detachment of the electric arc from the moving and stationary contacts, reduces the erosion of the moving and stationary contacts by the electric arc, and improves the electrical life and short-circuit breaking capacity of the switch.

[0030] 2. By stacking the core components, the core can be assembled from stacked ferromagnetic metal sheet stampings. The middle ferromagnetic metal sheets are stamped into core sheets that integrate the core and the arc-starting component. This simplifies the component structure and makes the core components integrated with the core assembly, resulting in better magnetic conductivity and faster arc attraction.

[0031] 3. By employing a magnetically attracted arc-initiating element in conjunction with the arc-initiating plate at the power supply terminal, the process of the arc entering the arc-extinguishing chamber involves two jumps: the first jump is from the stationary contact to the arc-initiating element, and the second jump is from the arc-initiating element to the arc-initiating plate at the power supply terminal. The jump speed is much faster than the traditional speed at which the arc transfers from the arc-initiating plate in the arc track to the arc-extinguishing chamber. This makes the entire short-circuit breaking process of the electrical switch shorter, the Joule integral smaller, and the short-circuit breaking capacity of the electrical switch higher. Attached Figure Description

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

[0033] Figure 1 This is a schematic diagram of the internal structure of the arc-extinguishing device of the switch according to the first embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the internal structure of the arc-extinguishing device of the switch according to the second embodiment of the present invention;

[0035] Figure 3 for Figure 2 A schematic diagram of the integrated structure of the iron core assembly and arc-starting component;

[0036] Figure 4 This is a schematic diagram of the internal structure of the arc-extinguishing device of the switch according to the third embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the internal structure of the arc-extinguishing device of the switch according to the fourth embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some embodiments of this invention, but not all embodiments.

[0039] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] First Embodiment

[0042] Please refer to Figure 1 This embodiment discloses an arc-extinguishing device for an electrical switch. The arc-extinguishing device is disposed within the insulating housing of the switch and includes at least a stationary contact assembly 200, a moving contact assembly 300, an iron core assembly 400, N arc-extinguishing grid plates 500, and a power supply terminal 600. The stationary contact assembly 200 includes a conductor section 210 and a contact portion 220 connected to one end of the conductor section 210. The contact portion 220 is provided with alloy contacts 230. The other end of the conductor section 210 is connected to the power supply terminal 600. The stationary contact assembly 200 is wound around the outer periphery of the iron core assembly 400. An arc-inducing element 700 is provided between the stationary contact assembly 200 and the iron core assembly 400. The arc-inducing component 700 is independently configured and is clamped between the contact portion 220 of the core assembly 400 and the stationary contact assembly 200. The arc-inducing component 700 extends obliquely towards the power terminal 600, starting from the end of the stationary contact assembly 200. The stationary contact assembly 200 and the arc-inducing component 700 surround the core assembly 400. The arc-inducing component 700 is made of magnetically conductive material, and the core assembly 400 is made of an integral magnetically conductive columnar metal component. When current passes through the stationary contact assembly 200, the arc-inducing component 700 immediately generates a magnetic field. When the moving contact assembly 300 is electrically separated from the stationary contact assembly 200, the resulting arc is immediately attracted by the magnetic field on the arc-inducing component 700.

[0043] The conductor segment 210 is arranged on the outer periphery of the core assembly 400. The conductor segment 210 through which the current flows is partially or completely surrounded on the outer periphery of the core assembly 400. When current flows through the conductor segment 210, it generates a magnetic field on the core assembly 400. The arc-starting element 700 is separately disposed from the core assembly 400. One end of the arc-starting element 700 is disposed on the opposite side of the alloy contact 230 on the contact portion 220 and is disposed close to the core assembly 400 and the contact portion 220. The magnetic field generated by the core assembly 400 is conducted to the arc-starting element 700.

[0044] The arc-extinguishing device further includes a load terminal 1000, on which a moving contact arc-inducing plate 900 electrically connected is provided. N arc-extinguishing grid plates 500 are arranged sequentially along the length of the switch to form an arc-extinguishing chamber. The arc-extinguishing chamber is located below the moving contact assembly and the stationary contact assembly. The moving contact arc-inducing plate 900 extends towards the maximum open position of the moving contact assembly 300 after being adjacent to the rightmost arc-extinguishing grid plate 500. The power terminal 600 is also provided with a power connection. An arc-starting piece 800 is provided, with one end electrically connected to the power terminal 600 or the stationary contact assembly 200, and the other end extending towards the leftmost arc-extinguishing grid piece 500, adjacent to it. The N arc-extinguishing grid pieces are at least 6 pieces, preferably 18 pieces in this embodiment. The arc-extinguishing grid pieces 500 are spaced apart between the moving contact arc-starting piece 900 and the power terminal arc-starting piece 800. When a short circuit interrupts the current, the conductor flowing through the stationary contact assembly 200... The current in section 210 increases exponentially, and the induced magnetic field on the core assembly 400 also increases exponentially. After the arc-initiating element 700 is placed close to the core assembly 400, the strong magnetic field is conducted to the arc-initiating element 700. When the moving contact assembly 300 separates from the stationary contact assembly 200, an arc is generated. The arc is quickly attracted by the arc-initiating element 700, jumps onto the arc-initiating element 700, and is ejected towards the arc-extinguishing grid 500, ionizing the surrounding air and causing the arc to jump from the arc-initiating element 700 to the arc-initiating plate 800 at the power supply terminal. Simultaneously, the arc... One end also jumps from the moving contact assembly 300 to the moving contact arc igniting plate 900. Through two jumps, the arc is quickly stretched to its longest length and connected between the arc igniting plate 800 at the power supply terminal and the 18 arc extinguishing grid plates 500, and then connected to the moving contact arc igniting plate 900. This divides the arc into several short arcs in series, and the arc voltage rises rapidly. After being cooled and deionized by the arc extinguishing grid plates 500, the arc voltage is raised to a level higher than the system recovery voltage, and the arc is quickly extinguished. This greatly shortens the breaking time and improves the breaking capacity of the electrical switch.

[0045] Second Embodiment

[0046] like Figure 2 and Figure 3As shown, the difference from the first embodiment is that the core assembly 400 and the arc-starting element 700 are integrally formed. The core assembly 400 is composed of multiple magnetically conductive metal sheets stacked together. The two middle magnetically conductive metal sheets are integrally formed with the arc-starting element 700. The arc-starting element 700 and the core assembly 400 together generate a magnetic field. The arc-starting element 700 extends from the core assembly 400 and is positioned close to the end of the contact portion 220. The free end of the arc-starting element 700 extends obliquely towards the power supply terminal 600. The stationary contact assembly 200 carries current. The conductor segment 210 is partially or partially surrounded by the outer periphery of the core assembly 400. When a large current flows through the conductor segment 210, the magnetic field generated by the core assembly 400 is conducted to the arc-initiating element 700. When the switch breaks a short-circuit fault, the arc generated by the separation of the moving contact assembly 300 and the stationary contact assembly 200 is quickly attracted away from the stationary contact assembly 200 by the arc-initiating element 700 with a strong magnetic field, so as to reduce the time the arc stays on the stationary contact assembly 200 and protect the stationary contact assembly 200 from excessive erosion by the arc, thereby improving the breaking performance and electrical life of the switch.

[0047] Third Embodiment

[0048] like Figure 4 As shown, the difference from the first embodiment is that the arc-inducing element 700 is hook-shaped and has multiple bends. Specifically, the arc-inducing element 700 includes a first segment adjacent to the core assembly 400, a second segment adjacent to the contact portion 220, and a third segment extending towards the power terminal 600. The first segment and the second segment are approximately perpendicular, and the second segment and the third segment are acute-angled. The arc-inducing element 700 is electrically connected to the stationary contact assembly 200. The core assembly 400 is composed of stacked sheet-like magnetically conductive metal parts, and the root of the arc-inducing element 700 is tightly attached to the core. On one side of component 400, the conductor segment 210 through which the current flows in the stationary contact component 200 is partially or completely surrounded by the outer periphery of the core component 400. The magnetic field generated by the core component 400 is conducted to the arc-initiating element 700. When the switch breaks a short-circuit fault, the arc generated by the separation of the moving contact component 300 and the stationary contact component 200 is quickly attracted away from the stationary contact component 200 by the arc-initiating element 700 with a strong magnetic field, thereby reducing the time the arc stays on the stationary contact component 200 and protecting the stationary contact component 200 from excessive erosion by the arc, thus improving the breaking performance and electrical life of the switch.

[0049] Fourth embodiment

[0050] like Figure 5As shown, this embodiment provides an arc-extinguishing device according to the fourth embodiment. The difference from the first embodiment is that the arc-initiating element 700 is integrated with the stationary contact assembly 200. The arc-initiating element 700 is an extension structure on the contact portion 220 of the stationary contact assembly 200. The root of the arc-initiating element 700 is disposed close to the core assembly 400. The magnetic field generated by the core assembly 400 is conducted to the arc-initiating element 700. The conductor segment 210 of the stationary contact assembly 200 is arranged around the core assembly 400. The conductor segment 210 through which current flows in the stationary contact assembly 200 has a spiral structure that surrounds the core assembly 400 1.5 times. The magnetic field generated by the core assembly 400 is conducted to the arc-starting element 700. The magnitude of the magnetic field generated by the core assembly 400 is related to the number of turns of the conductor segment 210 around the core assembly 400 and the magnitude of the current. The more turns, the stronger the magnetic field. The stronger the current, the stronger the magnetic field. When the switch breaks a short-circuit fault, the arc generated by the separation of the moving contact assembly 300 and the stationary contact assembly 200 will be quickly attracted away from the stationary contact assembly 200 by the arc-starting element 700 with a strong magnetic field, so as to reduce the time the arc stays on the stationary contact assembly 200 and protect the stationary contact assembly 200 from excessive erosion by the arc, thereby improving the breaking performance and electrical life of the switch.

[0051] This invention may be implemented in other specific forms without departing from its spirit and essential characteristics. The present embodiments are to be regarded in all respects as exemplary rather than limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and all modifications falling within the meaning of the claims and their equivalents are thus included within the scope of the invention.

Claims

1. An arc-extinguishing device for an electrical switch, the arc-extinguishing device being disposed within the insulating housing of the switch, comprising at least a stationary contact assembly, a moving contact assembly, an iron core assembly, N arc-extinguishing grid plates, and a power supply terminal, wherein the stationary contact assembly or the iron core assembly is provided with an arc-initiating element, the arc-initiating element being integrally disposed with the stationary contact assembly or the iron core assembly, or the arc-initiating element being separately disposed from the stationary contact assembly or the iron core assembly and disposed adjacent to the iron core assembly, the arc-initiating element extending obliquely towards the power supply terminal from the end of the stationary contact assembly, the stationary contact assembly being disposed on the outer periphery of the iron core assembly, characterized in that: The arc-initiating element is made of magnetic material. When current flows through the stationary contact assembly, the iron core assembly generates a magnetic field. The magnetic field generated by the iron core assembly is directly or indirectly transmitted to the arc-initiating element. When the moving contact assembly and the stationary contact assembly are electrically separated, the resulting arc is attracted by the magnetic field on the arc-initiating element.

2. The arc-extinguishing device for an electrical switch according to claim 1, characterized in that, One end of the stationary contact assembly is electrically connected to the power supply terminal, the middle section is a conductor section, and the end is a contact part, which is provided with alloy contacts.

3. The arc-extinguishing device for an electrical switch according to claim 2, characterized in that, The conductor segment is arranged around the outer periphery of the core assembly, partially or completely surrounding it. When current flows through the conductor segment, it generates a magnetic field on the core assembly.

4. The arc-extinguishing device for an electrical switch according to claim 3, characterized in that, When the arc-starting component and the core assembly are separately arranged, the arc-starting component is located on the opposite side of the alloy contact point on the contact part of the stationary contact assembly or at the end of the contact part, and is located close to the core assembly and the contact part. The magnetic field generated by the core assembly is conducted to the arc-starting component.

5. The arc-extinguishing device for an electrical switch according to claim 3, characterized in that, When the core assembly and the arc-starting component are integrated, the core assembly is composed of multiple magnetically conductive metal sheets stacked together, with at least one sheet in the middle being integrated with the arc-starting component. The arc-starting component and the core assembly together generate a magnetic field.

6. The arc-extinguishing device for an electrical switch according to claim 3, characterized in that, When the arc-initiating component is integrated with the stationary contact assembly, the arc-initiating component is an extension structure on the contact portion of the stationary contact assembly. The arc-initiating component is disposed close to the core assembly, and the magnetic field generated by the core assembly is conducted to the arc-initiating component.

7. The arc-extinguishing device for an electrical switch according to claim 3, characterized in that, When the arc-initiating element and the stationary contact are separately configured, the arc-initiating element is located on the opposite side of the alloy contact point on the contact portion of the stationary contact assembly or at the end of the contact portion, and is located close to the core assembly and the contact portion. The arc-initiating element and the stationary contact assembly are electrically connected, and the magnetic field generated by the core assembly is conducted to the arc-initiating element.

8. The arc-extinguishing device for an electrical switch according to claim 3, characterized in that, When the core assembly and the arc-starting component are set separately, the core assembly is made of stacked sheet-like magnetic conductive metal parts or an integral magnetic conductive columnar metal part. The arc-starting component is set on the opposite side of the alloy contact on the contact part of the stationary contact assembly or at the end of the contact part, and is set close to the core assembly and the contact part. The magnetic field generated by the core assembly is conducted to the arc-starting component.

9. An arc-extinguishing device for an electrical switch according to claim 3, characterized in that, When the conductor segment is arranged to fully surround the outer periphery of the core assembly, the conductor segment through which the current flows in the stationary contact assembly has a spiral structure that surrounds the core assembly at least once.

10. An arc-extinguishing device for an electrical switch according to claim 1, characterized in that, The arc extinguishing device also includes a load terminal, and the load terminal is provided with a moving contact arc-inducing piece electrically connected thereto. The moving contact arc-inducing piece is located adjacent to one side of the arc extinguishing grid and extends toward the maximum open position of the moving contact assembly.

11. The arc-extinguishing device for an electrical switch according to claim 1, characterized in that, The power terminal is also provided with a power terminal arc-inducing piece. One end of the power terminal arc-inducing piece is electrically connected to the power terminal or the stationary contact assembly, and the other end extends toward one side of the arc-extinguishing grid and is located near the arc-extinguishing grid.

12. The arc-extinguishing device for an electrical switch according to claim 1, characterized in that, N is greater than or equal to 6, and the N arc-extinguishing grid plates are arranged at intervals between the moving contact arc-inducing plate and the power supply terminal arc-inducing plate.

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