Arc extinguishing mechanism and switch

Abstract

The utility model provides a kind of arc extinguishing mechanism and switch, it is related to arc extinguishing technical field.The arc extinguishing mechanism includes structure main body, contact support, static contact and moving contact.Wherein, static contact is U type conducting structure, for when short-circuit current flows, electric repulsion is generated.Moving contact is connected with contact support, and located in the downside of static contact, for under the action of contact support, first stroke is moved downward, and under the action of electric repulsion, second stroke is further moved downward, until being stopped by limit protrusion.That is to say, the utility model provides arc mechanism, by mechanical drive and electromagnetic force synergistic effect, the two-stage separation movement of moving contact is realized, so as to significantly increase the opening distance between moving contact and static contact, improve arc lengthening capacity and arc extinguishing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of arc extinguishing technology, and more specifically, to an arc extinguishing mechanism and a switch. Background Technology

[0002] With the continuous development of power systems and electrical equipment, circuit breakers, as key components for circuit protection, are widely used in various power distribution systems to achieve automatic disconnection in the event of overload, short circuit and other faults.

[0003] However, the inventors discovered that in the traditional structure, when executing the automatic tripping command triggered by the short-circuit current, the movement of the moving contact is directly driven by the operating mechanism, which limits the maximum opening distance and makes it impossible to further open the arc. Utility Model Content

[0004] The purpose of this utility model is to provide an arc-extinguishing mechanism and switch that can increase the opening distance between the moving and stationary contacts when executing an automatic tripping command triggered by a short-circuit current, effectively lengthen the arc length, accelerate arc cooling and extinguishing, and improve arc-extinguishing efficiency and breaking capacity.

[0005] The embodiments of this utility model can be implemented as follows: Firstly, this utility model provides an arc-extinguishing mechanism, comprising: The main structure has an installation cavity, and the bottom wall of the installation cavity has a limiting protrusion. Contact support, the contact support is located inside the mounting cavity; The stationary contact is a U-shaped conductive structure located inside the mounting cavity, used to generate an electrodynamic repulsion force when a short-circuit current flows through it; The moving contact is connected to the contact support and is located inside the mounting cavity and below the stationary contact. It is used to move downward for the first stroke under the action of the contact support and to move downward for the second stroke under the action of electric repulsion until it is stopped by the limiting protrusion.

[0006] In an optional embodiment, the arc extinguishing mechanism further includes an elastic reset member, one end of which is connected to or abuts against the bottom wall of the mounting cavity, and the other end is connected to or abuts against the moving contact.

[0007] In an optional embodiment, the moving contact protrudes downward to form a protrusion, and the elastic reset member is sleeved on the protrusion.

[0008] In an optional embodiment, the moving contact includes a main body and two arms connected to both sides of the main body; wherein the main body is slidably connected to the contact support, and both arms extend out of the contact support and are respectively disposed corresponding to the stationary contact.

[0009] In an optional implementation, the limiting protrusions correspond one-to-one with the arm portion.

[0010] In an optional embodiment, the moving contact is provided with a first arc-inducing portion, which is inclined in the direction away from the stationary contact.

[0011] In an optional embodiment, the stationary contact is provided with a second arc-inducing portion, which is disposed opposite to the first arc-inducing portion.

[0012] In an optional implementation, the vertical distance between the lowest point of the first arc-leading part and the lowest point of the moving contact is defined as d, and the height of the limiting protrusion is defined as D, where D>d.

[0013] In an optional implementation, arc-extinguishing grid plates are provided on both sides of the moving contact.

[0014] Secondly, this utility model provides a switch, including an operating mechanism and an arc-extinguishing mechanism as described in any of the foregoing embodiments. The operating mechanism is used to act on a contact support so that the contact support drives the moving contact to move downward.

[0015] The beneficial effects of the arc-extinguishing mechanism and switch provided in this embodiment of the invention include: This invention provides an arc-extinguishing mechanism and a switch. The arc-extinguishing mechanism includes a main body, a contact support, a stationary contact, and a moving contact. The stationary contact has a U-shaped conductive structure, used to generate an electro-repulsive force when a short-circuit current flows through it. The moving contact is connected to the contact support and located below the stationary contact. It moves downward for a first stroke under the action of the contact support, and further downward for a second stroke under the action of the electro-repulsive force, until it is stopped by a limiting protrusion. In other words, the arc-extinguishing mechanism provided by this invention achieves two-stage separation movement of the moving contact through the combined action of mechanical drive and electromagnetic force, thereby significantly increasing the gap between the moving and stationary contacts and improving the arc elongation capacity and arc-extinguishing efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the first stroke of the arc-extinguishing mechanism provided in this embodiment; Figure 2 Provided for this embodiment Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the second stroke of the arc-extinguishing mechanism provided in this embodiment; Figure 4 Provided for this embodiment Figure 3 Enlarged view of point B in the middle; Figure 5 This is a structural schematic diagram of the moving contact, stationary contact, and contact support provided in this embodiment; Figure 6 This is another structural schematic diagram of the first stroke of the arc extinguishing mechanism provided in this embodiment; Figure 7 This is another structural schematic diagram of the second stroke of the arc extinguishing mechanism provided in this embodiment; Figure 8 This is a simplified kinematic diagram of the arc-extinguishing mechanism provided in this embodiment; Figure 9 This is a schematic diagram of the switch provided in this embodiment.

[0018] Icons: 1-Switch; 10-Arc extinguishing mechanism; 30-Operating mechanism; 100-Main structure; 110-Mounting cavity; 130-Limiting protrusion; 200-Contact bracket; 210-Inner cavity; 230-Slide groove; 300-Stationary contact; 400-Moving contact; 410-Main body; 411-Protrusion; 430-Arm; 500-Elastic reset element; 600-Arc extinguishing grid assembly; 710-First arc ignition part; 730-Second arc ignition part. Detailed Implementation

[0019] In related technologies, when executing an automatic tripping command triggered by a short-circuit current, the movement of the moving contact is directly driven by the operating mechanism, limiting the maximum opening distance and preventing further arcing.

[0020] To address the aforementioned problems, this utility model provides an arc-extinguishing mechanism and a switch, which can increase the opening distance between the moving and stationary contacts when executing an automatic tripping command triggered by a short-circuit current, effectively lengthening the arc length, accelerating arc cooling and extinguishing, and improving arc-extinguishing efficiency and breaking capacity.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the 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.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0027] The following describes in detail the arc-extinguishing mechanism and switch provided by this utility model through embodiments and in conjunction with the accompanying drawings. Please refer to the figures for the overall structure, working principle, and technical effects.

[0028] Please see Figures 1 to 4 This utility model provides an arc-extinguishing mechanism 10, applied to a switch 1. When executing an automatic tripping command triggered by a short-circuit current, it increases the distance between the moving and stationary contacts 300, effectively lengthening the arc length, accelerating arc cooling and extinguishing, and improving arc-extinguishing efficiency and breaking capacity. The arc-extinguishing mechanism 10 includes a main body 100, a contact support 200, a stationary contact 300, and a moving contact 400.

[0029] The main structure 100 includes a mounting cavity 110, and a limiting protrusion 130 is provided on the bottom wall of the mounting cavity 110. The contact bracket 200, the moving contact 400, and the stationary contact 300 are all located within the mounting cavity 110. Furthermore, the stationary contact 300 has a U-shaped conductive structure, which is used to generate an electrodynamic repulsion force when a short-circuit current flows through it.

[0030] Based on the above, the moving contact 400 is connected to the contact support 200 and located below the stationary contact 300. It is used to move downward for a first stroke under the action of the contact support 200 and to move downward for a second stroke under the action of electric repulsion until it is stopped by the limiting protrusion 130.

[0031] Based on the above settings, this utility model embodiment provides an arc extinguishing mechanism 10, the core of which is to achieve two-stage separation motion of the moving contact 400 through the synergistic action of mechanical drive and electromagnetic force, thereby significantly increasing the opening distance between the moving and stationary contacts 300 and improving the arc elongation capability and arc extinguishing efficiency.

[0032] Furthermore, because the moving contact 400 undergoes a first stroke driven by the contact support 200 and a second stroke propelled by electric repulsion under short-circuit conditions, the displacement during the entire downward movement is significant. Therefore, as... Figure 2 and Figure 4 As shown, the arc extinguishing mechanism 10 also includes an elastic reset member 500. One end of the elastic reset member 500 is connected to or abuts against the bottom wall of the mounting cavity 110, and the other end is connected to or abuts against the moving contact 400.

[0033] Based on the above, on the one hand, the elastic reset member 500 has sufficient stroke adaptability and can maintain the elastic deformation range when the moving contact 400 reaches the maximum opening distance, thus avoiding plastic failure; on the other hand, the elastic reset member 500 also has appropriate rebound force, which can push the moving contact 400 upward to return to the initial position after the switch 1 completes fault disconnection and current cut-off, thus preparing for the next closing operation.

[0034] To effectively prevent the spring from skewing, twisting, or dislodging during compression or rebound, the moving contact 400 protrudes downward to form a protrusion 411, and the elastic return member 500 is sleeved on the protrusion 411. Specifically, the protrusion 411 is a cylindrical, square, or other suitable boss structure, and its axis is usually aligned with the direction of movement of the moving contact 400, which facilitates guiding the compression and rebound of the elastic return member 500.

[0035] Furthermore, the moving contact 400 includes a main body 410 and two arms 430 connected to both sides of the main body 410. The main body 410 is slidably connected to the contact support 200 and can reciprocate smoothly in the vertical direction relative to the contact support 200 under the action of an external driving force, thereby driving the two arms 430 to move synchronously. Both arms 430 extend out of the contact support 200 and are respectively arranged corresponding to the stationary contact 300 to form a separable contact pair.

[0036] like Figure 4 and Figure 5As shown, the contact support 200 is a hollow structure with one end open, having an inner cavity 210 and two sliding grooves 230 communicating with the inner cavity 210. Correspondingly, the main body 410 is located in the inner cavity 210 and can slide along the inner cavity 210. The two arms 430 respectively extend through the corresponding sliding grooves 230 to be correspondingly arranged with the stationary contact 300.

[0037] Based on the above, since the contact support 200 is a hollow structure and the inner cavity 210 is open, one end of the elastic reset member 500 is connected to or abuts against the main body 410, and the other end extends out of the inner cavity 210 and is connected to or abuts against the bottom wall of the mounting cavity 110.

[0038] Based on this, the elastic reset member 500 is limited by the inner cavity 210 of the contact support 200 during the movement, which can maintain a good axial force state during compression and rebound, effectively avoiding twisting, tilting or failure caused by off-center load, and improving operational stability and service life.

[0039] It is understood that the main body 410 protrudes downward on the side near the elastic limiting member, forming the protrusion 411 in the aforementioned embodiment.

[0040] Furthermore, the limiting protrusion 130 corresponds one-to-one with the arm 430. That is to say, each arm 430 is equipped with an independent limiting protrusion 130 on its downward movement path, and the two are positioned opposite each other in the vertical direction, forming a precise stopping and stopping relationship.

[0041] Please see Figure 5 In order to more effectively guide the electric arc into the arc-extinguishing chamber, improve the arc traction speed and stability, and thus accelerate the arc cooling and extinguishing process, the moving contact 400 is provided with a first arc-initiating part 710, which is inclined in the direction away from the stationary contact 300.

[0042] Correspondingly, the stationary contact 300 is provided with a second arc-inducing part 730, which is disposed opposite to the first arc-inducing part 710, thereby working together with the first arc-inducing part 710 to lengthen the electric arc.

[0043] It should be noted that the first arc-inducing part 710 and the second arc-inducing part 730 are respectively located at the front end of the silver point position of the moving contact 400 and the stationary contact 300. They can quickly guide the arc from the silver point area to the outside in the early stage of contact separation, avoid the arc from staying on the silver point, thereby effectively reducing contact burn-off and improving the contact's resistance to arc erosion and service life.

[0044] Please refer to it again. Figure 2 The height of the limiting protrusion 130 is defined as D, which is the vertical height of its upward extension from the bottom wall of the mounting cavity 110, used to limit the maximum stroke of the moving contact 400 downward.

[0045] Please refer to it again. Figure 5 The vertical distance between the lowest point of the first arc-leading part 710 and the lowest point of the moving contact 400 is defined as d. It should be noted that the lowest point of the moving contact 400 here refers to the part where the body of the moving contact 400 contacts the top of the limiting protrusion 130 when the moving contact 400 descends to the limit position.

[0046] Based on the above, the height D and the spacing d satisfy the following relationship: D>d.

[0047] The aforementioned dimensional relationships mean that, in the final state where the moving contact 400 moves to its maximum opening distance and is completely stopped by the limiting protrusion 130, the moving contact 400 body has achieved reliable positioning, while the lowest point of the first arc-initiating part 710 is still located above the bottom wall of the mounting cavity 110 and has not come into contact with it. Therefore, deformation or damage caused by the first arc-initiating part 710 impacting the underlying structure during the high-speed downward movement of the moving contact 400 under the action of electrodynamic repulsion can be effectively avoided, thus ensuring its structural integrity and the normal functioning of its arc-initiating function.

[0048] In one optional embodiment of this utility model, such as Figure 6 and Figure 7 As shown, arc-extinguishing grid assemblies 600 are provided on both sides of the moving contact 400. When the switch 1 breaks the circuit under short-circuit current conditions, the moving contact 400 and the stationary contact 300 separate and generate an electric arc. As the moving contact 400 moves downward under the drive of the contact support 200 and the action of electrodynamic repulsion, the electric arc is rapidly elongated. At the same time, since the arc-extinguishing grid assemblies 600 are provided on both sides of the moving contact 400, the electric arc is effectively guided into the gap between the arc-extinguishing grids under the combined action of electromagnetic force, thermal buoyancy, and surrounding airflow.

[0049] Optionally, two arc-extinguishing grid groups 600 are symmetrically arranged on both sides of the moving contact 400, and each arc-extinguishing grid group 600 is composed of multiple parallel metal grids.

[0050] Please see Figure 8 Taking the arc-extinguishing mechanism 10 provided by this utility model as an example, its working principle and working process are as follows: When executing the automatic tripping command triggered by short-circuit current: First, driven by the operating mechanism 30, the contact support 200 drives the moving contact 400 connected to it to move downwards for a first stroke S1, which is generally 2-6 mm. This stage mainly completes the initial separation between the moving and stationary contacts 300, causing them to break the electrical contact state, and the circuit begins to be cut off. At the same time, an initial electric arc is formed between the contacts.

[0051] Subsequently, since the stationary contact 300 adopts a U-shaped conductive structure, when the short-circuit current flows through the circuit between the stationary contact 300 and the moving contact 400, according to the principle of electromagnetic repulsion, an electromagnetic repulsion (i.e., electric repulsion) is generated under the action of a large current. Under the action of this repulsion, the moving contact 400 overcomes the pre-pressure of the elastic reset member 500 and continues to accelerate downward, entering the second stroke S2, which is generally 4 to 16 mm.

[0052] As the moving contact 400 achieves a large total opening distance (S1+S2) during the two-stage motion, the arc between the moving and stationary contacts 300 is rapidly lengthened. The increased arc length leads to an increase in arc voltage and faster energy dispersion. With the synergistic effect of the arc-extinguishing grid assembly 600, the arc is rapidly cooled and eventually extinguished. The breaking capacity of the arc-extinguishing mechanism 10 can reach more than 50kA.

[0053] When the moving contact 400 descends to its limit position, its body contacts the limiting protrusion 130 on the bottom wall of the mounting cavity 110 via its arm 430, thus coming to a complete stop. At this time, the height D of the limiting protrusion 130 is designed to be greater than the vertical distance d between the lowest point of the first arc-inducing part 710 and the lowest point of the moving contact 400 (i.e., D>d), ensuring that the moving contact 400 completes its positioning before the first arc-inducing part 710, so that the lowest point of the first arc-inducing part 710 remains above the bottom wall of the mounting cavity 110, preventing it from colliding or being squeezed by the structure below during high-speed movement.

[0054] Finally, after the fault current is successfully cut off, the electric repulsion disappears, the elastic reset element 500 gradually releases its stored energy, and relies on its own rebound force to push the moving contact 400 upward to reset to the initial closing preparation position, so as to prepare for the next normal closing operation.

[0055] In summary, this utility model provides an arc-extinguishing mechanism 10, which includes a structural body 100, a contact support 200, a stationary contact 300, and a moving contact 400. The stationary contact 300 has a U-shaped conductive structure, used to generate an electro-repulsive force when a short-circuit current flows through it. The moving contact 400 is connected to the contact support 200 and located below the stationary contact 300. It moves downwards for a first stroke under the action of the contact support 200, and further downwards for a second stroke under the action of the electro-repulsive force, until it is stopped by the limiting protrusion 130. That is to say, the arc-extinguishing mechanism provided by this utility model, through the combined action of mechanical drive and electromagnetic force, achieves two-stage separation movement of the moving contact 400, thereby significantly increasing the gap between the moving and stationary contacts 300, and improving the arc elongation capacity and arc-extinguishing efficiency.

[0056] In addition, such as Figure 9As shown, this utility model also provides a switch 1, which includes an operating mechanism 30 and an arc-extinguishing mechanism 10 in the aforementioned embodiment. Therefore, when executing an automatic tripping command caused by a short-circuit current, the switch 1 can also increase the opening distance between the moving and stationary contacts 300, effectively lengthen the arc length, accelerate arc cooling and extinguishing, and improve arc-extinguishing efficiency and breaking capacity.

[0057] Furthermore, the operating mechanism 30 acts on the contact support 200, that is, provides mechanical driving force so that the contact support 200 drives the moving contact 400 downward, thereby initiating the separation action of the arc extinguishing mechanism 10.

[0058] Specifically, the operating mechanism 30 adopts a structure combining four-bar and five-bar linkages. In the normal locking and tripping states, the mechanism is in a four-bar configuration, enabling normal closing and opening operations. When the locking action is triggered, the mechanism changes from a four-bar state to a five-bar structure, entering a tripping state, thereby releasing the stored energy and completing the opening action.

[0059] Optionally, the turntable can be rotated by rotating the operating handle, or other transmission methods can be used to drive the entire operating mechanism 30 to move, thereby realizing the opening and closing operation of switch 1.

[0060] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. An arc extinguishing mechanism, characterized by, include: The main body (100) is provided with a mounting cavity (110), and a limiting protrusion (130) is provided on the bottom wall of the mounting cavity (110). A contact support (200) is located within the mounting cavity (110); A stationary contact (300) is a U-shaped conductive structure located in the mounting cavity (110) and is used to generate an electric repulsion force when a short-circuit current flows through it. The moving contact (400) is connected to the contact support (200), located in the mounting cavity (110) and below the stationary contact (300), and is used to move downward for a first stroke under the action of the contact support (200) and move downward for a second stroke under the action of electric repulsion until it is stopped by the limiting protrusion (130).

2. The quenching mechanism of claim 1, wherein The arc extinguishing mechanism (10) further includes an elastic reset member (500), one end of which is connected to or abuts against the bottom wall of the mounting cavity (110), and the other end is connected to or abuts against the moving contact (400).

3. The quenching mechanism of claim 2, wherein, The moving contact (400) protrudes downward to form a protrusion (411), and the elastic reset member (500) is sleeved on the protrusion (411).

4. The quenching mechanism of claim 1, wherein, The moving contact (400) includes a main body (410) and two arms (430) connected to both sides of the main body (410); wherein the main body (410) is slidably connected to the contact support (200), and both arms (430) extend out of the contact support (200) and are respectively arranged corresponding to the stationary contact (300).

5. The arc-extinguishing mechanism according to claim 4, characterized in that, The limiting protrusion (130) corresponds one-to-one with the arm portion (430).

6. The quenching mechanism according to any one of claims 1 to 5, characterized in that The moving contact (400) is provided with a first arc-inducing portion (710), which is inclined in a direction away from the stationary contact (300).

7. The arc-extinguishing mechanism according to claim 6, characterized in that, The stationary contact (300) is provided with a second arc-leading portion (730), which is disposed opposite to the first arc-leading portion (710).

8. The quenching mechanism of claim 6, wherein, The vertical distance between the lowest point of the first arc-leading part (710) and the lowest point of the moving contact (400) is defined as d, and the height of the limiting protrusion (130) is defined as D, where D>d.

9. The quenching mechanism according to any one of claims 1 to 5, characterized in that Both sides of the moving contact (400) are provided with arc-extinguishing grid plates (600).

10. A switch, characterized by Includes an operating mechanism (30) and an arc-extinguishing mechanism (10) as described in any one of claims 1-9, wherein the operating mechanism (30) acts on the contact support (200) to cause the contact support (200) to drive the moving contact (400) to move downward.

Images