Arc extinguishing structure of switching device and switching device

Abstract

The utility model relates to the technical field of switching devices, in particular to an improvement of an arc extinguishing structure of a switching device, the arc extinguishing structure is used for extinguishing electric arcs of a contact component, the contact component comprises a static contact part and an action execution assembly provided with a movable contact part, and the arc extinguishing structure comprises an arc isolating part and an arc extinguishing grid plate assembly. The arc-isolating piece is used for being linked with the action execution assembly, the arc-isolating piece comprises an arc-isolating part, the arc-isolating part is used for forming a physical isolation barrier, the arc-extinguishing grid piece assembly comprises a plurality of arc-extinguishing pieces which are arranged at intervals, and at least one part of the arc-extinguishing pieces are arranged on at least one side of a motion trail of the arc-isolating part and cover a partial area of at least one side of the motion trail; therefore, the arc isolating part presses at least one part of arc to the arc extinguishing grid piece assembly along with the action of the arc isolating piece. The arc is pressed to the arc extinguishing grid plate assembly by the arc isolating part, the dissipation time of the free arc is shortened through the arc extinguishing grid plate assembly, the arc isolating part is prevented from being burnt by the arc in the process of lengthening the arc, and the arc extinguishing performance is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of switch electrical appliances, in particular to an improvement of an arc extinguishing structure of a switch electrical appliance. Background Art

[0002] Switching electrical appliances such as disconnectors and circuit breakers are generally provided with an arc extinguishing structure to extinguish the arc generated during the disconnection process of the moving contact and the static contact. The patent application with application number CN202410718156.7 discloses a switching electrical appliance, whose switch unit adopts a movable insulating arc-isolating member to physically isolate the moving contact and the static contact to achieve the arc extinguishing function. Specifically, when the moving contact and the static contact are closed, the arc-isolating member moves to one side of the closing point of the moving contact and the static contact (that is, the arc-isolating member moves to the avoidance position) to facilitate the closing of the moving contact and the static contact; when the moving contact and the static contact are disconnected, the arc-isolating member moves to between the moving contact and the static contact (that is, the arc-isolating member moves to the arc-isolating position) to form an arc-isolating barrier between the moving contact and the static contact, stretching the arc and isolating the free arc on both sides of the arc-isolating barrier to extinguish the arc. However, the arc-isolating piece has limited effect on lengthening the arc, which prolongs the time it takes for the free arc to dissipate. The free arc may also reignite, and the temperature of the arc is high. The arc-isolating piece will be burned by the arc during the process of lengthening the arc. Therefore, after long-term use, the arc-isolating piece will be burned by the arc, resulting in poor insulation performance, which is not conducive to arc extinguishing. Summary of the Invention

[0003] The purpose of the utility model is to provide an arc extinguishing structure of a switching electrical appliance and the switching electrical appliance, which cooperates with an arc isolation piece and an arc extinguishing grid to increase the arc extinguishing speed in the air and improve the arc extinguishing performance of the switching electrical appliance.

[0004] To achieve the above objectives, the technical solution of the present utility model includes:

[0005] A switching electrical appliance arc extinguishing structure, the arc extinguishing structure is used to extinguish the arc of a contact component, the contact component includes a static contact part and an action execution component provided with a moving contact part, the arc extinguishing structure includes an arc isolation member and an arc extinguishing grid assembly, the arc isolation member is used to be linked to the action execution component, the arc isolation member includes an arc isolation portion, the arc isolation member is driven by the action execution component to selectively switch to the arc isolation position so that the arc isolation portion forms a physical isolation barrier between the disconnected moving contact part and the static contact part, the arc extinguishing grid assembly includes a plurality of arc extinguishing plates arranged at intervals, at least a portion of the arc extinguishing plates are arranged on at least one side of the motion trajectory of the arc isolation portion and cover a partial area of at least one side of the motion trajectory, so that the arc isolation portion presses at least a portion of the arc toward the arc extinguishing grid assembly as the arc isolation member moves.

[0006] In one embodiment, the arc-extinguishing plates of the arc-extinguishing grid assembly are divided into multiple parts, wherein the arc-extinguishing plates of the first part constitute a first grid group, and the arc-extinguishing plates of the first grid group are arranged at intervals along one side of the movement trajectory of the arc-isolating portion and form a small gap with the arc-isolating portion, so that the arc-isolating portion presses at least a part of the arc toward the first grid group as the arc-isolating member moves.

[0007] In one embodiment, an insulating arc-blocking portion is further included, and the arc-blocking portion is partially circumferentially disposed in a direction away from the arc-isolating portion of the first grid plate group.

[0008] In one embodiment, the arc-extinguishing plates of the second part of the arc-extinguishing grid assembly form a second grid group, the second grid group is arranged on one side of the movement trajectory of the arc-isolating portion and forms a small gap with the arc-isolating portion, the second grid group and the first grid group are respectively arranged on opposite sides of the movement trajectory of the arc-isolating portion, and the arc-extinguishing plates of the second grid group are arranged at intervals along the movement trajectory of the arc-isolating portion, so that the arc-isolating portion presses the arc toward the second grid group as the arc-isolating member moves.

[0009] In one embodiment, the arc-extinguishing plates of the third part of the arc-extinguishing grid assembly constitute a third grid group, and the arc-extinguishing plates of the third grid group are used to be arranged at intervals along the movement trajectory of the moving contact part, so that a portion of the arc is pressed toward the third grid group with the help of the movement of the moving contact part along the disconnecting direction.

[0010] In one embodiment, the third grid plate group is provided with a protruding portion, and the protruding portion is used to overlap with at least a portion of the moving contact portion in its extending direction.

[0011] In one embodiment, the arc-isolating member is rotatably arranged on the base, and the arc-isolating member is a cover-shaped structure, which includes an arc-isolating shaft rotatably arranged on the base, and the arc-isolating portion is an arc-shaped plate-shaped structure arranged outside the arc-isolating shaft, and also includes a first connecting portion connected to the arc-isolating shaft and the arc-isolating portion, and the arc-isolating portion is arranged on the side of the first connecting portion away from the base, and the side of the first connecting portion facing the base is provided with a first sliding structure, and the base is provided with a second sliding structure, and the first sliding structure and the second sliding structure are matched in a concave-convex manner.

[0012] In one embodiment, the first sliding structure is a sliding groove, and the second sliding structure is a slide plate protruding from the surface of the base, and the shapes of the slide plate and the sliding groove correspond to each other; and / or,

[0013] The end of the arc isolation portion is also used for cutting the arc during the process of switching to the arc isolation position. The end of the arc isolation portion used for cutting the arc is defined as the arc cutting end. The arc extinguishing grid assembly is arranged at the end of the arc isolation portion where the arc cutting end is located, so that at least a portion of the arc extinguishing plate covers the area where the arc cutting end is located on at least one side of the arc isolation portion, and also includes a second connecting portion arranged at the opposite end of the arc cutting end of the arc isolation portion.

[0014] The technical solution of the utility model also includes:

[0015] A switching device includes a base assembly and an arc extinguishing structure and a contact component arranged on the base assembly, wherein the arc extinguishing structure and the contact component form a connection relationship with the arc extinguishing structure of the switching device mentioned above.

[0016] In one embodiment, the switching device is a disconnector or a circuit breaker.

[0017] The beneficial effects of the utility model are:

[0018] 1. The arc extinguishing structure includes an arc-isolating member provided with an arc-isolating portion and an arc-extinguishing grid assembly. At least a portion of the arc-extinguishing plates of the arc-extinguishing grid assembly is arranged on at least one side of the movement trajectory of the arc-isolating portion and covers a partial area of at least one side of the movement trajectory. Therefore, during the movement of the arc-isolating member, the arc-isolating portion can stretch the arc and press the stretched arc toward the arc-extinguishing grid assembly located on its side. The arc-extinguishing grid assembly shortens the time for the free arc to dissipate, prevents the arc-isolating member from being burned by the arc during the process of stretching the arc, and ensures arc extinguishing performance.

[0019] 2. The first grid group and the second grid group are respectively arranged on both sides of the movement trajectory of the arc isolation part. Therefore, during the movement of the arc isolation part, the arc isolation part presses a part of the arc into the gap between adjacent arc extinguishing plates of the first grid group and the second grid group through the small gap between it and the first grid group and the second grid group, thereby further cutting the arc and increasing the opening distance between the moving and static contact parts to prevent the arc from reigniting.

[0020] 3. The third grid group is set on one side of the movement trajectory of the moving contact part, so that the arc is brought to the adjacent arc extinguishing pieces of the third grid group by means of the movement of the moving contact part, thereby achieving further cutting of the arc and increasing the distance between the moving and static contacts to prevent the arc from reigniting.

[0021] 4. The arc-isolating member and the base of the hood-shaped structure rely on the first sliding structure and the second sliding structure to form a concave-convex fit, which can prevent the arc from passing through the gap between the first connecting part and the base and reigniting. Cooperating with the arc-isolating part, it increases the arc-isolating effect and further reduces the probability of the arc reigniting. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a diagram of the arc extinguishing structure and contact component connection structure of Example 1 of the present utility model.

[0023] Figure 2 It is a front view of the contact component of embodiment 1 of the present invention in the disconnected state.

[0024] Figure 3 It is a front view of the contact component of embodiment 1 of the present invention in the conducting state.

[0025] Figure 4 yes Figure 2 A partial enlarged view of the .

[0026] Figure 5 It is an exploded view of some parts of Example 1 of the present utility model.

[0027] Figure 6 This is a diagram of the arc extinguishing structure and contact component connection structure of Example 2 of the present utility model.

[0028] Figure 7 It is a front view of the contact component of embodiment 2 of the present invention in the disconnected state.

[0029] Figure 8 It is a front view of the contact component of embodiment 2 of the present invention in the conducting state.

[0030] Wherein: 1 contact component, 11 static contact part, 12 moving contact part, 13 action execution component, 2 arc isolation part, 21 arc isolation part, 210 arc cutting end, 22 first connecting part, 221 second sliding structure, 23 second connecting part, 3 arc extinguishing grid assembly, 31 first grid group, 32 second grid group, 33 third grid group, 331 protruding part, 34 arc blocking part, 4 base assembly, 41 base, 411 first sliding structure. DETAILED DESCRIPTION

[0031] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0032] Example 1

[0033] See Figures 1 to 3As shown, the utility model discloses an arc extinguishing structure of a switching electrical appliance, which is used to extinguish the arc of a contact component 1. The contact component 1 includes a static contact portion 11 and an action execution component 13 provided with a dynamic contact portion 12. The action execution component 13 is a turntable component. The dynamic contact portion 12 extends along the radial direction of the turntable component and forms a dynamic contact portion on both radial sides of the turntable component. Correspondingly, the static contact portion 11 is provided with two and respectively corresponds to the dynamic contact portion 12, thereby forming two groups of contact groups. The dynamic contact portion 12 rotates under the drive of the action execution component 13 and switches between the conduction position and the disconnection position. When the dynamic contact portion 12 is in the conduction position, the dynamic contact portion 12 forms an electrical connection with the static contact portion 11; when the dynamic contact portion 12 is in the disconnection position, the dynamic contact portion 12 is away from the static contact portion 11 and disconnected from the static contact portion 11.

[0034] The arc extinguishing structure includes an arc-isolating member 2 and an arc-extinguishing grid assembly 3. The arc-isolating member 2 is rotatably mounted on a base assembly 4 and is linked to an action execution assembly 13 via a gear transmission structure. As the action execution assembly 13 moves, the arc-isolating member 2 rotates and switches between a avoidance position and an arc-isolating position. The arc-isolating member 2 of this embodiment is a hood-shaped structure, which includes an arc-isolating portion 21. When the movable contact portion 12 is in the conducting position, the arc-isolating member 2 is driven by the action execution assembly 13 to switch to the avoidance position; when the movable contact portion 12 is in the disconnecting position, the arc-isolating member 2 is driven by the action execution assembly 13 to switch to the arc-isolating position, so that the arc-isolating portion 21 forms a first physical isolation barrier between the disconnected movable contact portion 12 and the static contact portion 11, thereby isolating the arcs of the movable contact portion 12 and the static contact portion 11.

[0035] There are two groups of arc isolation members 2 and arc extinguishing grid assemblies 3 respectively, forming two groups of arc extinguishing structures, and each group of arc extinguishing structures corresponds to one contact group.

[0036] See Figures 1 to 5 As shown, the arc-extinguishing grid assembly 3 includes a plurality of arc-extinguishing plates arranged at intervals, at least a portion of which is arranged on at least one side of the motion trajectory of the arc-isolating portion 21 and covers a portion of the area on at least one side of the motion trajectory, so that the arc-isolating portion 21 presses a portion of the arc toward the arc-extinguishing grid assembly 3 as the arc-isolating member 2 moves. The motion trajectory of the arc-isolating portion 21 refers to the area through which the arc-isolating portion 21 passes during the switching movement between the avoidance position and the arc-isolating position. The arc-isolating portion 21 of this embodiment is a plate-like structure, so its motion trajectory is a linear structure. Among them, the switching of the arc-isolating member 2 between the avoidance position and the arc-isolating position as the action execution component 13 follows is prior art. Its specific switching process and related terminology definitions have been disclosed in the patent application number CN202410718156.7 filed by the applicant. The relevant content is referred to in the patent application and will not be repeated here.

[0037] In this embodiment, the arc-quenching grid assembly 3 is arranged on both sides of the motion trajectory of the arc-isolating portion 21. The multiple arc-quenching grids of the arc-quenching grid assembly 3 are divided into two parts: the arc-quenching grids of the first part constitute a first grid group 31, and the arc-quenching grids of the second part constitute a second grid group 32. The first grid group 31 and the second grid group 32 are arranged on opposite sides of the motion trajectory. The arc-quenching grids of the first grid group 31 are arranged at intervals along the motion trajectory of the arc-isolating portion 21, forming a small gap with the arc-isolating portion 21. As a result, the arc-isolating portion 21 presses a portion of the arc toward the first grid group 31. The arc-quenching grids of the second grid group 32 are arranged at intervals along the motion trajectory of the arc-isolating portion 21, also forming a small gap with the arc-isolating portion 21. As the arc-isolating portion 21 moves, it also presses the arc toward the second grid group 32.

[0038] The arc-extinguishing plates of the first grid plate group 31 and the second grid plate group 32 protrude a certain distance toward the arc isolation portion 21. The distance between the edge of the arc-extinguishing plate at the protrusion and the arc isolation portion 21 is the minimum distance between the arc-extinguishing plate and the arc isolation portion 21. The minimum distance is the distance between the first grid plate group 31 or the second grid plate group 32 and the arc isolation portion 21.

[0039] Among them, the small gap fit described in the present invention means that the minimum distance between the arc extinguishing piece and the arc isolation portion 21 is small, so that the arc can be squeezed into the gap between adjacent arc extinguishing pieces during the movement of the arc isolation portion 21, and the arc extinguishing piece will not affect the movement of the arc isolation portion 21. The specific gap value between the arc isolation portion 21 and the arc extinguishing piece (the minimum distance between the arc extinguishing piece and the arc isolation portion 21) is determined by technical personnel in this field according to actual needs.

[0040] The arc isolation member 2 of this embodiment is a cover-shaped structure rotatably arranged on the base assembly 4. The arc isolation portion 21 is a circular arc plate-shaped structure. The motion trajectory of the arc isolation portion 21 is a circular arc. The first grid plate group 31 and the second grid plate group 32 are respectively arranged on the inner and outer sides of the circular arc trajectory. More specifically, the first grid plate group 31 is arranged on the outer side of the circular arc trajectory, and the second grid plate group 32 is arranged on the inner side of the circular arc trajectory.

[0041] The base assembly 4 includes a base 41 and an upper cover. The upper cover and base 41 are arranged opposite each other, and a cavity for mounting the contact component 1 and the arc extinguishing structure is formed therebetween. The arc extinguishing plates of the first grid plate group 31 and the second grid plate group 32 are respectively inserted into the upper cover of the base assembly 4. However, the installation of the arc extinguishing plates is not limited to this. The arc extinguishing plates of the first grid plate group 31 can also be inserted into the base 41 of the base assembly 4.

[0042] The arc-extinguishing grid assembly 3 also includes an insulating arc-blocking portion 34. The arc-blocking portion 34 is partially disposed around the first grid assembly 31 in a direction away from the arc-isolating portion 21. The arc-blocking portion 34 cooperates with the base assembly 4 to form an arc-extinguishing chamber structure, thereby preventing the outward migration of the free arc, preventing it from affecting the electrical performance of the switch and ensuring arc extinguishing reliability. In this embodiment, the arc-blocking portion 34 is a plate-like structure disposed outside the first grid assembly 31. More specifically, the arc-blocking portion 34 is integrally molded onto the plastic base 41 of the base assembly 4. Therefore, the arc-blocking portion 34 is made of an insulating material, effectively blocking the free arc. It also extends the creepage distance between the moving contact 12 and the stationary contact 11, preventing arc reignition and further improving the arc-extinguishing performance of the switch. In other embodiments, the arc-blocking portion 34 can be a separate component fixedly connected to the base assembly 4 and made of an insulating material.

[0043] See Figure 3 and Figure 5 As shown, the arc-isolating member 2 is movably arranged on the base 41 of the base assembly 4. The arc-isolating member 2 also includes a first connecting portion 22. The arc-isolating portion 21 is connected to the first connecting portion 22 and extends relative to the first connecting portion 22 toward the side away from the base 41. The base 41 is provided with a first sliding structure 411. The side of the first connecting portion 22 facing the base 41 is provided with a second sliding structure 221. The first sliding structure 411 and the second sliding structure 221 are matched in a concave-convex manner. Specifically, the first sliding structure 411 is a slide protruding from the surface of the base 41, and the second sliding structure 221 is a slide groove having a shape corresponding to the slide. In other embodiments, the structures of the first sliding structure 411 and the second sliding structure 221 can be opposite, that is, the first sliding structure 411 is a slide groove, and the second sliding structure 221 is a slide.

[0044] The concave-convex fit between the first sliding structure 411 and the second sliding structure 221 can make up for the arc isolation gap between the arc isolation member 2 and the base 41, preventing the free arc remaining after cutting by the arc extinguishing grid assembly 3 from passing through the gap between the arc isolation member 2 and the base 41 and causing the arc to reignite.

[0045] See Figures 1 to 5As shown, since the arc isolation member 2 is a hood-shaped structure, the end of the arc isolation portion 21 is also used to cut the arc during the process of switching to the arc isolation position. The end of the arc isolation portion 21 used for cutting the arc is defined as the arc cutting end 210. In order to enable the arc to be smoothly squeezed into the gap between adjacent arc extinguishing plates during the elongation process, the arc extinguishing grid assembly 3 is arranged at the end where the arc cutting end 210 of the arc isolation portion 21 is located, thereby forming the arc extinguishing plates of the arc extinguishing grid assembly 3 covering the area where the arc cutting ends 210 on both sides of the arc isolation portion 21 are located. More specifically, when the arc isolation portion 21 is switched to the arc isolation position, the arc extinguishing grid assembly 3 is located on both sides of the arc isolation portion 21 and biased towards the end where the arc cutting end 210 is located. The arc-isolating member 2 also includes a second connecting portion 23, which is connected to the arc-isolating member 21 and the first connecting portion 22. The second connecting portion 23 is located on the side of the arc-isolating member 21 away from the arc-extinguishing grid assembly 3, so that the arc-isolating member 2 forms a hood-shaped structure semi-enclosed by the static contact portion 11. If there is no second connecting portion 23, the free arc may pass through the end of the arc-isolating member 21 away from the arc-extinguishing grid assembly 3 (that is, the end where the second connecting portion 23 is located) and reignite. Therefore, the hood-shaped arc-isolating member 2 and the arc-extinguishing grid assembly 3 in this embodiment cooperate to better prevent the arc from reigniting and improve the arc extinguishing performance of the arc extinguishing structure.

[0046] Example 2

[0047] See Figures 6 to 8 As shown, this embodiment differs from Example 1 in that the arc-quenching grid assembly 3 comprises a first grid group 31 and a third grid group 33. The arc-quenching grids of the arc-quenching grid assembly 3 include a first portion and a third portion. The arc-quenching grids of the third portion are arranged at intervals along the motion trajectory of the moving contact 12 to form the third grid group 33. This allows the moving contact 12 to move in the disconnecting direction, forcing a portion of the arc toward the third grid group 33. The first grid group 31 and the third grid group 33 are adjacent to each other. As the moving contact 12 moves from the conducting position to the disconnecting position, the moving contact 12 and the arc isolation member 21 synchronously press the arc toward the arc-quenching grids, thereby extinguishing the arc. When the contacts are disconnected, the arc isolation member 2 and the arc-quenching grid assembly 3 cooperate to increase the distance between the moving contact 12 and the stationary contact 11, thereby increasing the creepage distance between the moving contact 12 and the stationary contact 11, thereby improving arc extinguishing performance and reducing the probability of arc reignition.

[0048] See Figure 5As shown, the third grid plate assembly 33 is provided with a protruding portion 331. The protruding portion 331 is designed to overlap a portion of the moving contact portion 12 along its extension direction. In this embodiment, the protruding portion 331 is formed by arc-extinguishing plates extending a certain distance toward both sides of the moving contact portion 12. A clearance groove is formed between the two protruding structures to accommodate the movement of the moving contact portion 12. In other embodiments, the protruding portion 331 may be formed by the arc-extinguishing plates extending only toward one side of the moving contact portion 12, specifically, the side of the moving contact portion 12 facing the base 41 or the side of the moving contact portion 12 facing away from the base 41. As the moving contact portion 12 moves, the arc between the moving contact portion 12 and the stationary contact portion 11 is elongated and squeezed between adjacent arc-extinguishing plates in the third grid plate assembly 33, thereby extinguishing the arc. The presence of the protruding portion 331 facilitates the arc entering between adjacent arc-extinguishing plates in the third grid plate assembly 33, further improving the arc extinguishing effect of the arc-extinguishing grid plate assembly 3 and the arc extinguishing performance of the arc extinguishing structure.

[0049] Example 3

[0050] The difference between this embodiment and the above-mentioned embodiments 1 and 2 is that the structure of the arc-isolating member 2 is different. The arc-isolating member 2 of this embodiment is a plate-like structure, and its structure refers to the patent application with application number CN202410718156.7 submitted by the applicant. Specifically, it can be a flat plate structure or an arc-shaped plate structure, and the main body of the arc-isolating member 2 serves as the arc-isolating portion 21. At this time, the arc-extinguishing plates of the arc-extinguishing grid assembly 3 can be arranged only on the side of the arc-isolating portion away from the moving contact portion, or only on the side of the arc-isolating portion facing the moving contact portion, or respectively on both sides of the arc-isolating portion (respectively, the side away from the moving contact portion and the side facing the moving contact portion). If space permits, the arc-extinguishing plates can be arranged around the arc-isolating portion.

[0051] In the above-described embodiment, the arc-quenching grid assembly 3 includes a first grid group 31 and a second grid group 32, or includes the first grid group 31 and a third grid group 33. Thus, the first grid group 31 and the second grid group 32 cooperate with each other, or with the third grid group 33, to improve the arc-quenching performance of the arc-quenching structure. In other embodiments, the first grid group 31 is not limited to arc-quenching plates disposed outside the arc-shaped motion trajectory of the arc-isolating portion 21. The first grid group 31 may also refer to arc-quenching plates disposed inside the arc-shaped motion trajectory of the arc-isolating portion 21 (i.e., the positions of the first grid group 31 and the second grid group 32 are interchanged). If the current is sufficiently low, only the first grid group 31 may be provided. Furthermore, it is also feasible to implement the arc-quenching function of the arc-quenching grid assembly 3 by cooperating with the first grid group 31, the second grid group 32, and the third grid group 33, further improving arc-quenching performance to facilitate handling higher currents.

[0052] In the above embodiment, the arc-extinguishing plates of the arc-extinguishing grid assembly 3 are spaced apart along the motion trajectory of the arc isolation portion 21 or the moving contact portion 12, thereby facilitating the arc to be squeezed and quickly enter between adjacent arc-extinguishing plates during its elongation. In other embodiments, the arc-extinguishing plates may be spaced apart along a direction parallel or nearly parallel to the above motion trajectory, or along the relative position of the base 41 and the upper cover.

[0053] Example 4

[0054] This embodiment proposes a switching electrical appliance, which is an isolating switch or a circuit breaker, including a base assembly 4 and an arc extinguishing structure and a contact component 1 arranged on the base assembly 4. The structures of the arc extinguishing structure, the contact component 1 and the base assembly 4 and the connection relationship between the three have been described in Examples 1 to 3 and will not be repeated here.

[0055] Although the present invention is specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined by the appended claims fall within the scope of protection of the present invention.

Claims

1. An arc extinguishing structure for a switching device, the arc extinguishing structure being used to extinguish an arc in a contact component, the contact component comprising a stationary contact portion and an actuating assembly having a moving contact portion, characterized in that: The arc extinguishing structure includes an arc-isolating member and an arc-extinguishing grid assembly, wherein the arc-isolating member is used to be linked to the action execution assembly, and the arc-isolating member includes an arc-isolating portion. Driven by the action execution assembly, the arc-isolating member selectively switches to the arc-isolating position so that the arc-isolating portion forms a physical isolation barrier between the disconnected moving contact portion and the static contact portion. The arc-extinguishing grid assembly includes a plurality of arc-extinguishing plates arranged at intervals, at least a portion of the arc-extinguishing plates are arranged on at least one side of the motion trajectory of the arc-isolating portion and cover a partial area on at least one side of the motion trajectory, so that the arc-isolating portion presses at least a portion of the arc toward the arc-extinguishing grid assembly as the arc-isolating member moves.

2. The arc extinguishing structure of a switching device according to claim 1, characterized in that: The arc-extinguishing plates of the arc-extinguishing grid assembly are divided into multiple parts, wherein the arc-extinguishing plates of the first part constitute a first grid group. The arc-extinguishing plates of the first grid group are arranged at intervals along one side of the movement trajectory of the arc-isolating portion and form a small gap with the arc-isolating portion, so that the arc-isolating portion presses at least a portion of the arc toward the first grid group as the arc-isolating member moves.

3. The arc extinguishing structure of a switching device according to claim 2, characterized in that: It also includes an insulating arc-blocking portion, which is partially circumferentially arranged in a direction of the first grid plate group away from the arc-isolating portion.

4. The arc extinguishing structure of a switching device according to claim 2, characterized in that: The arc-extinguishing plates in the second part of the arc-extinguishing grid assembly form a second grid group. The second grid group is arranged on one side of the movement trajectory of the arc-isolating portion and forms a small gap with the arc-isolating portion. The second grid group and the first grid group are respectively arranged on opposite sides of the movement trajectory of the arc-isolating portion. The arc-extinguishing plates of the second grid group are arranged at intervals along the movement trajectory of the arc-isolating portion, so that the arc-isolating portion presses the arc toward the second grid group as the arc-isolating member moves.

5. The arc extinguishing structure of a switching device according to claim 2, characterized in that: The arc-extinguishing plates of the third part of the arc-extinguishing grid assembly constitute a third grid group. The arc-extinguishing plates of the third grid group are used to be arranged at intervals along the movement trajectory of the moving contact part, so that a part of the arc is pressed toward the third grid group with the help of the movement of the moving contact part along the disconnecting direction.

6. The arc extinguishing structure of a switching device according to claim 5, characterized in that: The third grid plate group is provided with a protruding portion, and the protruding portion is used to overlap with at least a portion of the moving contact portion in its extending direction.

7. The arc extinguishing structure of a switching device according to claim 1, characterized in that: The arc-isolating member is rotatably arranged on the base. The arc-isolating member is a cover-shaped structure, which includes an arc-isolating shaft rotatably arranged on the base. The arc-isolating portion is an arc-shaped plate-shaped structure arranged outside the arc-isolating shaft. It also includes a first connecting portion connected to the arc-isolating shaft and the arc-isolating portion. The arc-isolating portion is arranged on the side of the first connecting portion away from the base. The base is provided with a first sliding structure, and the side of the first connecting portion facing the base is provided with a second sliding structure. The first sliding structure and the second sliding structure are matched in a concave-convex manner.

8. The arc extinguishing structure of a switching device according to claim 7, characterized in that: The first sliding structure is a slide plate protruding from the surface of the base, and the second sliding structure is a slide groove having a shape corresponding to that of the slide plate; and / or, The end of the arc isolation portion is also used for cutting the arc during the process of switching to the arc isolation position. The end of the arc isolation portion used for cutting the arc is defined as the arc cutting end. The arc extinguishing grid assembly is arranged at the end of the arc isolation portion where the arc cutting end is located, so that at least a portion of the arc extinguishing plate covers the area where the arc cutting end is located on at least one side of the arc isolation portion, and also includes a second connecting portion arranged at the opposite end of the arc cutting end of the arc isolation portion.

9. A switch device, comprising a base assembly, an arc extinguishing structure and a contact component provided on the base assembly, characterized in that: The arc extinguishing structure and the contact component form a connection relationship according to the arc extinguishing structure of a switching electrical appliance according to any one of claims 1-8.

10. The switch device according to claim 9, characterized in that: The switching device is an isolating switch or a circuit breaker.

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