Static contact structure and circuit breaker
By setting protrusions higher than static contacts on the static conductive plate, the problem of easy ablation in the center of the static contacts of the circuit breaker is solved, and the arc is quickly transferred to the edge, which improves the electrical life and breaking indicators of the circuit breaker.
Patent Information
- Application Number
- CN202421386950.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-17
AI Technical Summary
When the existing circuit breaker is opened, the central area of the static contact is easily ablated by arcs, resulting in a low service life, affecting the electrical life and breaking indicators of the circuit breaker.
A static contact structure is designed, in which a static conductive plate is provided with a protrusion, and the height of the protrusion is greater than the height of the static contact, and the protrusion is arranged in a semi-encircled manner on the circumference of the static contact, and no protrusion is provided on the side away from the static arc plate.
By enhancing the electric field strength of the periphery of the static contact, the arc can quickly transfer to the edge of the static contact, avoiding central ablation, and improving the electrical life and breaking indicators of the circuit breaker.
Smart Images
Figure CN222867605U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a static contact structure and a circuit breaker. Background Art
[0002] When the circuit breaker is opened, an arc will be generated between the moving contact on the moving contact and the static contact on the static contact. The arc may stay in the central area of the static contact for a long time, causing the central area of the static contact to burn, reducing the service life of the static contact, and further reducing the electrical life of the circuit breaker product. At the same time, the breaking index of the circuit breaker is also restricted; in addition, the burning of the central area of the static contact will also cause poor contact between the moving and static contacts, affecting the stability of the internal circuit of the circuit breaker.
[0003] At present, the market has increasingly higher requirements on the performance of circuit breaker products. How to optimize the static contact structure to protect the central area of the static contact from arc erosion and improve the service life of the static contact structure is an urgent problem to be solved by technical personnel in this field. Utility Model Content
[0004] The first object of the utility model is to provide a stationary contact structure to solve the technical problem in the prior art that the electric arc easily burns the central area of the stationary contact, resulting in a shorter service life of the stationary contact.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A static contact structure comprises a static conductive plate and a static contact point, wherein the static contact point is fixedly arranged on the upper surface of the static conductive plate, the static conductive plate has a protrusion protruding from its upper surface, the protrusion is arranged on the periphery of the static contact point, and the height of the protrusion is greater than the height of the static contact point.
[0007] Furthermore, it also includes a static arc-striking piece, which is installed on the upper surface of the static conductive plate; the protrusion is not provided on the side of the static contact away from the static arc-striking piece.
[0008] Furthermore, the protrusion is arranged in a semi-enclosed manner on the periphery of the static contact, and a side of the protrusion away from the static arc-starting piece has a notch;
[0009] Alternatively, the static contact is polygonal in shape, and except for one side away from the static arc-striking piece, the protrusion is provided on the periphery of at least one other side of the static contact.
[0010] Furthermore, the static conductive plate includes an upper conductive part, a connecting part and a lower conductive part, and the upper conductive part, the connecting part and the lower conductive part are connected end to end in sequence to form a U-shaped structure; the static contact and the static arc-starting piece are both arranged on the upper conductive part.
[0011] Furthermore, the number of the protrusions is one or more.
[0012] Furthermore, the difference between the height of the protrusion and the height of the highest point of the static contact is less than or equal to 5 mm.
[0013] Furthermore, there is a gap between the protrusion and the static contact and / or between the static contact and the static arc-striking piece.
[0014] Furthermore, the distance between the protrusion and the static contact and / or between the static contact and the static arc-striking piece is less than or equal to 1 mm.
[0015] Furthermore, two ends of the protrusion are in contact with the static contact point respectively, and the protrusion and the static contact point are arranged to form a closed space;
[0016] Or, the static contact is rectangular, with the side of the static contact close to the static arc-striking piece as the reference side, and there is a gap between the reference side and the static arc-striking piece; the protrusions are respectively provided on the periphery of the two side sides of the static contact perpendicular to the reference side, and each of the protrusions is in contact with the static contact and the static arc-striking piece; the two protrusions, the static contact and the static arc-striking piece are arranged to form a space closed on all sides.
[0017] The second object of the utility model is to provide a circuit breaker to solve the technical problem in the prior art that the electrical life and breaking index of the circuit breaker are affected by the low service life of the static contacts.
[0018] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0019] A circuit breaker comprises any one of the above-mentioned stationary contact structures.
[0020] Beneficial effects of the utility model:
[0021] The utility model provides a static contact structure and a circuit breaker, wherein the static contact structure comprises a static conductive plate and a static contact point, wherein the static contact point is fixedly arranged on the upper surface of the static conductive plate; the static conductive plate has a protrusion protruding from its upper surface, the protrusion is arranged on the periphery of the static contact point, and the height of the protrusion is greater than the height of the static contact point.
[0022] In the static contact structure provided in the present application, the static conductive plate has a protrusion arranged on the periphery of the static contact, and the height of the protrusion is greater than the height of the static contact. Therefore, the protrusion can enhance the electric field strength around the static contact, so that the electric field strength around the static contact is higher than the electric field strength at the center of the static contact, which is beneficial to accelerate the transfer of the arc at the center of the static contact toward the edge of the static contact, thereby avoiding the risk of ablation at the center of the static contact, playing a role in protecting the static contact, and further improving the electrical life and breaking index of the circuit breaker product; in addition, since the arc can quickly move out of the central area of the static contact, the damage to the central area of the static contact is reduced, and the problem of poor contact between the moving and static contacts is alleviated. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 A structural schematic diagram of a first static contact structure provided for an embodiment of the first aspect of the utility model;
[0025] Figure 2 A schematic structural diagram of a second static contact structure provided for an embodiment of the first aspect of the utility model;
[0026] Figure 3 A schematic structural diagram of a third static contact structure provided by an embodiment of the first aspect of the utility model;
[0027] Figure 4 A schematic diagram of the internal structure of a circuit breaker provided in another embodiment of the utility model;
[0028] Figure 5 for Figure 4 Enlarged view at A.
[0029] icon:
[0030] 100-static contact structure; 110-static conductive plate; 111-protrusion; 112-upper conductive part; 113-connecting part; 114-lower conductive part; 120-static contact point; 130-static arc-starting piece;
[0031] 200-moving contact. DETAILED DESCRIPTION
[0032] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0033] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0034] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] In one aspect, an embodiment of the utility model provides a static contact structure 100, referring to Figure 1 The static contact structure 100 includes a static conductive plate 110 and a static contact 120, wherein the static contact 120 is fixedly arranged on the upper surface of the static conductive plate 110; the static conductive plate 110 has a protrusion 111 protruding from its upper surface, the protrusion 111 is arranged on the periphery of the static contact 120, and the height of the protrusion 111 is greater than the height of the static contact 120.
[0036] It should be noted that the description of the height recorded in the present invention is based on the state that the upper surface of the static conductive plate 110 is parallel to the horizontal plane; however, the positional relationship between the upper surface of the static conductive plate 110 and the horizontal plane is only for the convenience of describing the present invention, and is not a limitation of the present invention.
[0037] It should also be noted that the height of the protrusion 111 refers to the height of the highest point of the protrusion 111; the protrusion 111 may also have an area lower than the static contact 120. In addition, the height of the static contact 120 also refers to the height of the highest point of the static contact 120.
[0038] In the static contact structure provided in the present application, the static conductive plate 110 has a protrusion 111 arranged on the periphery of the static contact 120, and the height of the protrusion 111 is greater than the height of the static contact 120. Therefore, the protrusion 111 can enhance the electric field strength around the static contact 120, so that the electric field strength around the static contact 120 is higher than the electric field strength at the center of the static contact 120, which is beneficial to accelerate the transfer of the arc at the center of the static contact 120 toward the edge of the static contact 120, thereby avoiding the risk of ablation at the center of the static contact 120, playing a role in protecting the static contact 120, and further improving the electrical life and breaking index of the circuit breaker product; in addition, since the arc can quickly move out of the central area of the static contact 120, the damage to the central area of the static contact 120 is reduced, and the problem of poor contact between the moving and static contacts is alleviated.
[0039] In this embodiment, the protrusion 111 and the static contact 120 are made of different materials. The static contact 120 is made of a material with high conductivity such as silver, while the protrusion 111 is made of a material with lower conductivity than the static contact 120 such as copper.
[0040] Optionally, the number of the protrusions 111 is one or more. When the number of the protrusions 111 is multiple, the multiple protrusions 111 can be arranged on the same side of the static contact 120, or can be arranged on different sides of the static contact 120 respectively.
[0041] Continue to refer to Figure 1 The static contact structure 100 also includes a static arc-striking piece 130, which is mounted on the upper surface of the static conductive plate 110; the side of the static contact 120 away from the static arc-striking piece 130 is not provided with a protrusion 111 to prevent the static arc root from transferring to the side of the static contact 120 away from the static arc-striking piece 130.
[0042] In this embodiment, the static arc-striking piece 130 and the moving contact 200 are respectively arranged on opposite sides of the static contact 120; the side of the static contact 120 away from the static arc-striking piece 130 is not provided with a protrusion 111, that is, the side of the static contact 120 close to the moving contact 200 is not provided with a protrusion 111, so as not to affect the movement of the moving contact 200.
[0043] Furthermore, the thickness of the static arc-striking piece 130 is greater than the height of the highest point of the static contact 120, and the side of the static contact 120 close to the static arc-striking piece 130 can directly contact the static arc-striking piece 130. Since the thickness of the static arc-striking piece 130 is greater than the height of the highest point of the static contact 120, the static arc-striking piece 130 also plays a role in enhancing the electric field strength outside the static contact 120, that is, the side of the static arc-striking piece 130 close to the static contact 120 is equivalent to the protrusion 111.
[0044] As a first optional embodiment, continue to refer to Figure 1, the protrusion 111 is arranged in a semi-enclosed manner on the periphery of the static contact 120, and the side of the protrusion 111 away from the static arc-striking piece 130 has a notch. That is, the protrusion 111 is a U-shaped structure, with its closed end facing the static arc-striking piece 130 and its open end facing the moving contact 200 of the circuit breaker; the closed end of the protrusion 111 can abut against the static arc-striking piece 130 to facilitate the transfer of the arc to the static arc-striking piece 130. The above structure can maximize the electric field strength around the static contact 120, ensuring that the arc transfers to the edge of the static contact 120; at the same time, it can avoid interference between the protrusion 111 and the moving contact 200, and can also avoid the arc from transferring to the edge of the static contact 120 in the direction close to the moving contact 200, which is conducive to the arc entering the arc extinguishing chamber.
[0045] As a second optional embodiment, refer to Figure 2 The static contact 120 is polygonal in shape. Except for one side of the static contact 120 away from the static arc-starting piece 130, a protrusion 111 is disposed on the periphery of at least one side of the static contact 120. Specifically, Figure 2 In the illustrated embodiment, the static contact 120 is roughly rectangular, and a protrusion 111 is provided on the periphery of the side of the static contact 120 close to the static arc-striking piece 130; the above structure is conducive to the arc being transferred toward the edge of the static contact 120 in the direction close to the arc extinguishing chamber.
[0046] As a third optional embodiment, refer to Figure 3 The static contact 120 is roughly rectangular, with the side of the static contact 120 close to the static arc-starting piece 130 as the reference side, and a protrusion 111 is provided on the periphery of one or both sides of the static contact 120 perpendicular to the reference side; the above structure is conducive to the transfer of the arc toward the two sides of the static contact 120 perpendicular to the reference side.
[0047] Furthermore, there is a gap between the protrusion 111 and the static contact 120 and / or between the static contact 120 and the static arc-striking piece 130, and the gap is used to accommodate metal particles. Optionally, the spacing between the protrusion 111 and the static contact 120 and / or the spacing between the static contact 120 and the static arc-striking piece 130 is less than or equal to 1 mm, and preferably the spacing is 0 to 0.5 mm. During operation, the metal particles on the static contact 120 move to the periphery of the static contact 120 under the influence of the electric field generated by the protrusion 111, and fall into the gap between the protrusion 111 and the static contact 120 and / or between the static contact 120 and the static arc-striking piece 130, thereby preventing the problem of poor contact between the moving and static contacts caused by the presence of metal particles on the static contact 120, and improving the stability of the internal circuit of the circuit breaker.
[0048] As a first optional embodiment, refer to Figure 1The protrusion 111 is semi-enclosed around the static contact 120, and there is a gap between the inner surface of the protrusion 111 and the static contact 120. Further, both ends of the protrusion 111 are in contact with the static contact 120, and the protrusion 111 and the static contact 120 are surrounded to form a closed space.
[0049] As a second optional embodiment, refer to Figure 2 The static contact 120 is roughly rectangular, and a protrusion 111 is provided on the periphery of the side of the static contact 120 close to the static arc-starting piece 130, and there is a gap between the protrusion 111 and the static contact 120. Furthermore, both ends of the protrusion 111 are in contact with the static contact 120 respectively, and the protrusion 111 and the static contact 120 are surrounded to form a closed space.
[0050] As three optional embodiments, refer to Figure 3 The static contact 120 is roughly rectangular, with the side of the static contact 120 close to the static arc-striking piece 130 as the reference side, and there is a gap between the reference side and the static arc-striking piece 130; the peripheries of the two side sides of the static contact 120 perpendicular to the reference side are respectively provided with protrusions 111, and each protrusion 111 is in contact with the static contact 120 and the static arc-striking piece 130. Specifically, the side of each protrusion 111 close to the static contact 120 is in contact with the static contact 120, and the side of each protrusion 111 close to the static arc-striking piece 130 is in contact with the static arc-striking piece 130, so that the two protrusions 111, the static contact 120 and the static arc-striking piece 130 are surrounded to form a closed space.
[0051] In the above structure, the static contact 120, the protrusion 111 and the static arc-striking piece 130 are in contact in sequence, which is conducive to the arc entering the arc extinguishing chamber; at the same time, the closed space formed by the protrusion 111 and the static contact 120 or the protrusion 111, the static contact 120 and the static arc-striking piece 130 can better accommodate metal particles and prevent metal particles from falling to other places.
[0052] Continue to refer to Figure 1 The height difference between the protrusion 111 and the highest point of the static contact 120 is less than or equal to 5 mm, preferably 1 to 3 mm. This height difference range is conducive to the arc transfer to the edge of the static contact 120, avoiding ablation at the center of the static contact 120.
[0053] As an optional embodiment, refer to Figure 1 The upper surface of the protrusion 111 and the upper surface of the static contact 120 are both parallel to the upper surface of the static conductive plate 110, the distance between the upper surface of the protrusion 111 and the upper surface of the static conductive plate 110 is H1, the distance between the upper surface of the static contact 120 and the upper surface of the static conductive plate 110 is H2, and the difference between H1 and H2 is less than or equal to 5 mm.
[0054] As another optional embodiment, the upper surface of the static contact 120 is an arc surface, and the center point of the static contact 120 is the highest point of the static contact 120; the vertical distance between the highest point of the static contact 120 and the upper surface of the protrusion 111 is less than or equal to 5 mm.
[0055] Continue to refer to Figure 1 The static conductive plate 110 includes an upper conductive portion 112, a connecting portion 113 and a lower conductive portion 114, and the upper conductive portion 112, the connecting portion 113 and the lower conductive portion 114 are connected end to end in sequence to form a U-shaped structure; the static contact 120 and the static arc-striking piece 130 are both arranged on the upper conductive portion 112. Specifically, the static arc-striking piece 130 is connected to one end of the upper conductive portion 112 away from the connecting portion 113, and there is a gap between the static arc-striking piece 130 and the lower conductive portion 114, through which the arc and the lower conductive portion 114 can be effectively separated, so that the static arc-striking piece 130 is conducive to guiding the arc into the arc extinguishing chamber, reducing the length of the arc contacting the static conductive plate 110, and further improving the breaking index of the circuit breaker product.
[0056] Another embodiment of the utility model provides a circuit breaker, referring to Figure 4 The circuit breaker includes the static contact structure 100 described in any of the above embodiments. Therefore, the circuit breaker at least has all the technical effects of the above static contact structure 100, which will not be repeated here.
[0057] Reference Figure 5 In the illustrated embodiment, the static conductive plate 110 includes an upper conductive portion 112, a connecting portion 113 and a lower conductive portion 114, and the upper conductive portion 112, the connecting portion 113 and the lower conductive portion 114 are connected end to end in sequence to form a U-shaped structure; the circuit breaker also includes a moving contact 200, the closed end of the static conductive plate 110 faces the moving contact 200, and the static arc-striking piece 130 extends from the upper conductive portion 112 in a direction away from the moving contact 200; the upper surface of the upper conductive portion 112 has a protrusion 111, and the protrusion 111 is semi-enclosed and arranged on the periphery of the static contact 120, and the protrusion 111 has a notch on the side facing the moving contact 200.
[0058] When the moving contact 200 and the static contact 120 are separated, the arc at the center of the static contact 120 is quickly transferred to the edge of the static contact 120 under the influence of the electric field generated by the protrusion 111, thereby avoiding ablation at the center of the static contact 120 and improving the electrical life and breaking index of the circuit breaker product; and the gap between the static arc-starting plate 130 and the lower conductive part 114 can separate the arc from the lower conductive part 114, thereby reducing the length of the arc contacting the static conductive plate 110, which is beneficial to the extinction of the arc.
[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A static contact structure, comprising a static conductive plate (110) and a static contact point (120), wherein the static contact point (120) is fixedly arranged on the upper surface of the static conductive plate (110), characterized in that: The static conductive plate (110) has a protrusion (111) protruding from its upper surface, the protrusion (111) is arranged on the periphery of the static contact point (120), and the height of the protrusion (111) is greater than the height of the static contact point (120).
2. The stationary contact structure according to claim 1, characterized in that: It also includes a static arc-striking piece (130), which is mounted on the upper surface of the static conductive plate (110); the protrusion (111) is not provided on the side of the static contact (120) away from the static arc-striking piece (130).
3. The stationary contact structure according to claim 2, characterized in that: The protrusion (111) is arranged in a semi-enclosed manner on the periphery of the static contact (120), and a side of the protrusion (111) away from the static arc-starting piece (130) has a notch; Alternatively, the static contact (120) is polygonal in shape, and except for one side away from the static arc-striking piece (130), the protrusion (111) is provided on the periphery of at least one other side of the static contact (120).
4. The stationary contact structure according to claim 2, characterized in that: The static conductive plate (110) comprises an upper conductive portion (112), a connecting portion (113) and a lower conductive portion (114); the upper conductive portion (112), the connecting portion (113) and the lower conductive portion (114) are connected end to end in sequence to form a U-shaped structure; the static contact (120) and the static arc-starting plate (130) are both arranged on the upper conductive portion (112).
5. The stationary contact structure according to claim 1, characterized in that: The number of the protrusions (111) is one or more.
6. The stationary contact structure according to claim 1, characterized in that: The difference between the height of the protrusion (111) and the height of the highest point of the static contact (120) is less than or equal to 5 mm.
7. The stationary contact structure according to claim 2, characterized in that: There is a gap between the protrusion (111) and the static contact (120) and / or between the static contact (120) and the static arc-striking piece (130).
8. The stationary contact structure according to claim 7, characterized in that: The distance between the protrusion (111) and the static contact (120) and / or the distance between the static contact (120) and the static arc-striking piece (130) is less than or equal to 1 mm.
9. The stationary contact structure according to claim 7, characterized in that: Two ends of the protrusion (111) are in contact with the static contact (120) respectively, and the protrusion (111) and the static contact (120) are arranged to form a closed space; Alternatively, the static contact (120) is rectangular, with the side of the static contact (120) close to the static arc-striking piece (130) being the reference side, and a gap being provided between the reference side and the static arc-striking piece (130); the protrusions (111) are respectively provided on the periphery of the two side sides of the static contact (120) perpendicular to the reference side, and each of the protrusions (111) is in contact with the static contact (120) and the static arc-striking piece (130); the two protrusions (111), the static contact (120) and the static arc-striking piece (130) are arranged to form a space closed on all sides.
10. A circuit breaker, characterized in that: Comprising the stationary contact structure according to any one of claims 1 to 9.