Contact structure and switching device

Abstract

The utility model discloses a contact structure and a switching device. The contact structure comprises a first contact and a second contact, the first contact and the second contact are respectively provided with a contact surface, and the first contact and / or the second contact are / is movably arranged so as to realize contact or separation of the two contact surfaces; wherein at least one of the two contact surfaces is a concave-convex surface, the concave-convex surface comprises a convex part and a concave part, the fall between the convex part and the concave part is not less than 0.01 mm, and the convex part is used for being in contact with the other contact surface; the method has the characteristic that the possibility of fusion welding is reduced.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment and is a switching device, such as a circuit breaker, a relay, or a contactor, and specifically is a contact structure of the switching device. Background Art

[0002] In the field of electrical switches such as circuit breakers and contactors, the conduction between the moving and static contacts is often achieved by the moving contact of the moving contact and the static contact of the static contact.

[0003] Whether it is the existing moving contact or the static contact, the surface used for contact is a "flat surface" (the flat surface seen by the naked eye may appear to be a surface with certain bumps under a microscope, which is invisible to the naked eye because the bumps are very small). For example, as shown in Figure 19 of CN106463309B, conduction is achieved by using the entire lower surface of the fixed contact and the entire upper surface of the movable contact to stick together.

[0004] It is well known that a perfect plane (a plane with no error and a completely flat surface) does not exist. The conductor surface looks very smooth to the naked eye, but under a microscope, the conductor surface is often uneven. If the entire lower surface of the fixed contact and the entire upper surface of the movable contact are in contact with each other, once subjected to a large current, the fixed contact and the movable contact may melt due to the increase in temperature caused by the current, and the molten liquid will easily fill the very small "depression" where the two surfaces are in contact (here it is called depression because a perfect plane does not exist, and the existing structure where the two surfaces are in contact will inevitably have depressions from a microscopic point of view), and after the liquid solidifies, the fixed contact and the movable contact will stick together.

[0005] Therefore, how to design to reduce the possibility of fusion welding as much as possible is a problem worth studying. Summary of the invention

[0006] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a contact structure and a switch device that can reduce the possibility of fusion welding.

[0007] The present application provides: a contact structure, comprising a first contact and a second contact; the first contact and the second contact both have a contact surface, and the first contact and / or the second contact are movably arranged to achieve contact or separation of the two contact surfaces; wherein at least one of the two contact surfaces is a concave-convex surface, the concave-convex surface comprises a convex portion and a concave portion, the height difference between the convex portion and the concave portion is not less than 0.01 mm, and the convex portion is used to contact with the other contact surface.

[0008] With this structure, the contact surface of the first contact and / or the second contact is made into a concave-convex surface visible to the naked eye, that is, a concave-convex surface with a drop difference between the convex part and the concave part greater than or equal to 0.01 mm (because there are concave-convex references to each other, even 0.01 mm is visible to the naked eye), so as to reduce the possibility of welding between the two contacts (it is impossible to completely avoid the phenomenon of melting of such contacts due to the current, so it is just to reduce the possibility of welding as much as possible). The reason for reducing the possibility of welding can be either the following reason 1, the following reason 2, or the following reason 1 and reason 2. Reason 1: The area of ​​the overlapping part between the two contacts will be relatively small, and it is not easy to stick together (it can also be understood that the area of ​​adhesion of the molten metal liquid in the prior art is very large, and a large separation force is required to separate the moving and static contacts, and the separation force of the moving and static contacts often cannot meet this requirement, and ultimately the two cannot be separated; while the adhesion area of ​​the present application is very small, and the separation force requirement for the moving and static contacts is relatively small, so it is easy to break free and separate the two). Reason 2: The concave portion can also allow part of the molten liquid to flow into the concave portion, and is not easy to accumulate at the location of the convex portion, which can also reduce the possibility of adhesion.

[0009] In some embodiments of the present application, the contact surface of the first contact is a first concave-convex surface, the first concave-convex surface includes at least two first convex portions and a first concave portion, the first concave portion is located near the first convex portion, and the height difference between the first convex portion and the first concave portion is not less than 0.01 mm; the contact surface of the second contact is a second concave-convex surface, the second concave-convex surface includes at least two second convex portions and a second concave portion, the second concave portion is located near the second convex portion, and the height difference between the second convex portion and the second concave portion is not less than 0.01 mm; the contact between the two contact surfaces is achieved through the contact between the first convex portion and the second convex portion.

[0010] With this structure, the contact surfaces of the two contacts are made into concave and convex surfaces, which can further reduce the possibility of welding.

[0011] In some embodiments of the present application, the distribution mode of each first convex portion in the first concave-convex surface is the same as the distribution mode of each second convex portion in the second concave-convex surface, and the first convex portion and the second convex portion just touch each other to achieve contact between the two contact surfaces.

[0012] By adopting this method, the contact surfaces of the two contacts are both made into concave-convex surfaces, and the distribution of the first convex part and the second convex part can be selected to be the same. The contact between the two can achieve the contact between the two contact surfaces. Such a structure is relatively convenient to process.

[0013] In some embodiments of the present application, the distribution pattern of each first convex portion in the first concave-convex surface is different from the distribution pattern of each second convex portion in the second concave-convex surface, but one first convex portion has an overlapping portion with at least one second convex portion, and the overlapping portion of the first convex portion and the second convex portion is affixed to achieve contact between the two contact surfaces.

[0014] By adopting this method in which the contact surfaces of the two contacts are made into concave-convex surfaces, the distribution of the first convex portion and the second convex portion can be selected to be different, but the first convex portion and the second convex portion have overlapping parts. By sticking the overlapping parts together, the possibility of fusion welding can be further reduced, and the processing is also more convenient.

[0015] In some embodiments of the present application, the distribution pattern of the first convex portions in the first concave-convex surface is regular, and the distribution pattern of the second convex portions in the second concave-convex surface is regular.

[0016] In some embodiments of the present application, the distribution of the first convex portions in the first concave-convex surface is random, and the distribution of the second convex portions in the second concave-convex surface is random.

[0017] For the first convex part and the second convex part, their distribution can be arranged according to a certain rule or completely randomly. No matter which arrangement method is adopted, the overlapping area is reduced or there are recesses, which can effectively reduce the possibility of fusion welding. The rule here should be understood as the arrangement of the first convex part and the second convex part meets certain conditions, which can be arranged per certain unit area, at a certain angle, at a certain distance, or according to certain lines or patterns.

[0018] In some embodiments of the present application, the first convex portion is a strip-shaped structure, the first concave portion is a strip-shaped groove, and two adjacent first convex portions are separated by the first concave portion.

[0019] In some embodiments of the present application, the second convex portion is a strip-shaped structure, the second concave portion is a strip-shaped groove, and two adjacent second convex portions are separated by the second concave portion.

[0020] The first and second convex parts of the strip-shaped structure and the first and second concave parts of the strip-shaped groove are relatively easy to process and form, and the effect of reducing fusion welding of this structure is relatively excellent.

[0021] In some embodiments of the present application, the first convex portion is a boss, and the first concave portion is a groove surrounding the first convex portion.

[0022] In some embodiments of the present application, the second convex portion is a boss, and the second concave portion is a groove surrounding the second convex portion.

[0023] The first and second convex parts of the boss and the first and second concave parts surrounding the boss are relatively easy to process and form, and the effect of reducing fusion welding of this structure is also relatively good.

[0024] In some embodiments of the present application, the first convex portion is a strip-shaped structure, the first concave portion is a strip-shaped groove, and two adjacent first convex portions are separated by the first concave portion; the second convex portion is a strip-shaped structure, the second concave portion is a strip-shaped groove, and two adjacent second convex portions are separated by the second concave portion; the first convex portion and the second convex portion are cross-arranged.

[0025] By adopting the cross arrangement of the first convex portion and the second convex portion, the possibility of fusion welding can be greatly reduced.

[0026] In some embodiments of the present application, the first contact and the second contact are columnar structures, the contact surface of the first contact and the contact surface of the second contact are mutually matching inclined surfaces, there is an angle A between the contact surface of the first contact and the axial direction of the first contact, and the 88°≥A≥60°.

[0027] The contact surface of the first contact and the contact surface of the second contact are mutually matching inclined surfaces, which can relatively increase the current-carrying area. This structure combined with the above-mentioned concave-convex structure can not only ensure a better current-carrying area and reduce temperature rise, but also reduce the possibility of fusion welding.

[0028] A switching device includes a contact assembly, the contact assembly includes a first contact body, a second contact body and the above-mentioned contact structure, the first contact point is fixed on the first contact body, and the second contact point is fixed on the second contact body.

[0029] In some embodiments of the present application, a first welding surface is provided on the first contact body, the first contact point includes a first welding face, the first welding face is welded on the first welding surface, and the first welding surface and / or the first welding face is a plane or a surface with a concave-convex structure.

[0030] In some embodiments of the present application, a surface of the first contact body is provided with a first welding surface, the first welding surface is recessed in the surface of the first contact body, the first contact point includes a first welding surface, the first welding surface is welded on the first welding surface, and the first welding surface and / or the first welding surface is a plane or a surface with a concave-convex structure.

[0031] When the concavo-convex structure first welding surface and / or the first welding surface is a concavo-convex structure surface, the welding piece attachment rate can be increased during welding, and the utilization rate of solder can be improved. After batch testing, the soldering rate of this structure after welding can reach more than 99%. After passing high-frequency and multiple product action tests, the contacts have no detachment, which can solve various problems caused by poor welding of existing products. At the same time, the first welding surface is concave in the surface of the first contact body, which is conducive to the positioning of the first contact during welding.

[0032] In some embodiments of the present application, a second welding surface is provided on the second contact body, the second contact point includes a second welding surface, the second welding surface is welded on the second welding surface, and the second welding surface and / or the second welding surface is a plane or a surface with a concave-convex structure.

[0033] In some embodiments of the present application, a second welding surface is provided on the second contact body, the second welding surface is recessed in the surface of the second contact body, the second contact point includes a second welding surface, the second welding surface is welded on the second welding surface, and the second welding surface and / or the second welding surface is a plane or a surface with a concave-convex structure.

[0034] When the second welding surface with a concavo-convex structure and / or the second welding surface is a surface with a concavo-convex structure, the welding sheet adhesion rate can be increased during welding, and the utilization rate of solder can be improved. After batch testing, the soldering rate of this structure after welding can reach more than 99%. After passing high-frequency and multiple product action tests, the contacts have no falling off, which can solve various problems caused by poor welding of existing products. At the same time, the second welding surface is concave in the surface of the second contact body, which is conducive to the positioning of the second contact during welding.

[0035] In some embodiments of the present application, the switch is a circuit breaker, the first contact body is a moving contact body, the second contact body is a stationary contact body, and the moving contact body is rotatably arranged to achieve contact or separation of two contact surfaces.

[0036] In some embodiments of the present application, the switching device is a contactor or a relay, the first contact body is a moving contact bridge, the second contact body is a static contact assembly, the moving contact bridge is slidingly arranged to achieve contact or separation of the two contact surfaces, and the moving contact bridge is located next to the first contact point and is provided with an arc striking angle.

[0037] The arc striking angle design is adopted. When the product is disconnected, the arc root moves outward, and the arc is quickly attracted away from the contacts through the arc striking angle, which greatly reduces the time that the arc continues to burn at the contact position, reduces the wear of the contacts, and improves the life of the contactor and relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic diagram showing the structure of the contact structure of the present application applied in a contactor;

[0040] Figure 2 A schematic structural diagram showing an implementation of a first contact point of the contact structure of the present application;

[0041] Figure 3 A schematic structural diagram showing an implementation of the second contact of the contact structure of the present application;

[0042] Figure 4 A schematic diagram showing the contact structure of the present application when the first contact point and the second contact point are in contact;

[0043] Figure 5 A structural schematic diagram showing another implementation of the first contact of the contact structure of the present application;

[0044] Figure 6 A structural schematic diagram showing another implementation of the second contact of the contact structure of the present application;

[0045] Figure 7 A diagram showing the relationship between the contact surface and the axis of the contact structure of the present application;

[0046] Figure 8 The schematic diagram of the structure of the moving contact bridge in the contactor is shown;

[0047] Fig. 9 The schematic diagram of the structure of the static contact component in the contactor is shown;

[0048] Fig.10 An axial view showing an embodiment of a first contact of the contact structure of the present application;

[0049] Fig.11 An axial view showing an embodiment of the second contact of the contact structure of the present application;

[0050] Fig.12 A structural schematic diagram showing the contact structure of the present application applied in a circuit breaker. Implementation

[0051] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0052] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0054] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0056] like Figure 1-Figure 12As shown, an embodiment of the present application is a switching device, and the switching device is a contactor.

[0057] The contactor includes a stationary contact assembly 10 (that is, a second contact body), a ceramic cover 20, a moving contact bridge 30 (that is, a first contact body), an upper bracket 40, a push rod assembly 50, and a contact structure arranged on the stationary contact assembly 10 and the moving contact bridge 30. There are two stationary contact assemblies 10, one end of which is located outside the ceramic cover 20 for wiring, and the other end is located inside the ceramic cover 20. The moving contact bridge 30 is arranged inside the ceramic cover 20, and the moving contact bridge 30 is arranged on the upper bracket 40, and the contact structure is turned on and off as the upper bracket 40 moves. An arcing angle 31 is arranged on the moving contact bridge 30. The movement principle of the moving contact bridge 30 here is common knowledge to those skilled in the art, and will not be repeated here.

[0058] There are two groups of contact structures in this embodiment. Since the principles of the two groups of contact structures are basically the same (the positions and directions of the settings are different), one group of contact structures is taken as an example to introduce the principles of the structure.

[0059] The contact structure includes a first contact 60 and a second contact 70 .

[0060] The first contact 60 is fixed on the moving contact bridge 30, and the second contact 70 is fixed on the stationary contact assembly 10. Both the first contact 60 and the second contact 70 have a contact surface 67, and conduction is achieved through the contact of the two contact surfaces 67, and disconnection is achieved through the separation of the two contact surfaces 67. At least one of the two contact surfaces 67 is a concave-convex surface, and the concave-convex surface includes a convex portion and a concave portion, and the height difference between the convex portion and the concave portion is not less than 0.01 mm, and the convex portion is used to contact the other contact surface 67. The at least one concave-convex surface here should be understood as the contact surface 67 of the first contact 60 is a concave-convex surface, or the contact surface 67 of the second contact 70 is a concave-convex surface, or the contact surfaces 67 of the first contact 60 and the second contact 70 are both concave-convex surfaces. Figure 1-3 As shown in Figures 10-11, in this embodiment, the contact surface 67 of the first contact 60 and the contact surface 67 of the second contact 70 are both concave-convex surfaces. In order to distinguish the two concave-convex surfaces, the contact surface 67 of the first contact 60 is the first concave-convex surface, and the contact surface 67 of the second contact 70 is the second concave-convex surface. The first concave-convex surface includes at least two or more first convex portions 61 and first concave portions 62. The first concave portion 62 is located near the first convex portion 61, and the height difference between the first convex portion 61 and the first concave portion 62 is not less than 0.01 mm. The second concave-convex surface includes at least two or more second convex portions 71 and second concave portions 72. The second concave portion 72 is located near the second convex portion 71. The height difference between the second convex portion 71 and the second concave portion 72 is not less than 0.01 mm. The contact between the two contact surfaces 67 is achieved through the contact between the first convex portion 61 and the second convex portion 71.

[0061] By setting such a concave-convex surface, the possibility of welding between the two contacts can be reduced (it is impossible to completely avoid the phenomenon of melting of such contacts due to electric current, so it is just to reduce the possibility of welding as much as possible). The reason for reducing the possibility of welding can be either the following reason one, the following reason two, or the following reason one and reason two. Reason one: The area of ​​the overlapping part S1 between the two contacts will be relatively small, and it is not easy to stick together (it can also be understood that the adhesion area of ​​the molten metal liquid in the prior art is very large. If the moving and static contacts want to be separated, a large separation force is required to separate the two, and often the separation force of the moving and static contacts cannot meet this requirement, and ultimately the two cannot be separated; while the adhesion area of ​​the present application is very small, and the separation force requirement for the moving and static contacts is relatively small, so it is easy to break free and separate the two). Reason two: The effect of the concave part can also make a part of the molten liquid flow into the concave part, and it is not easy to accumulate at the position where the convex part is located, which can also reduce the possibility of adhesion.

[0062] For the first convex portion 61 and the second convex portion 71 , the distribution modes of the two may be completely the same or completely different.

[0063] Take the completely identical distribution as an example, that is, the positions of the first protrusions 61 and the second protrusions 71 are completely corresponding (for example, both use Figure 2 As shown in the structure, the two are exactly in contact with each other, and the contact between the two contact surfaces 67 is achieved through the contact between the two.

[0064] Take different distribution methods as an example, such as Figure 2-4 As shown, the first convex portion 61 is a strip-shaped structure, the first concave portion 62 is a strip-shaped groove, and two adjacent first convex portions 61 are separated by the first concave portion 62. The second convex portion 71 is also a strip-shaped structure, the second concave portion 72 is a strip-shaped groove, and two adjacent second convex portions 71 are separated by the second concave portion 72. The directions of the arrays of the first convex portion 61 and the second convex portion 71 are different. The first convex portion 61 and the second convex portion 71 are arranged crosswise, and the intersection is the overlapping portion S1 of the two. When in contact, the first convex portion 61 ( Figure 4 The solid line portion) and the second convex portion 71 ( Figure 4 The overlapping part S1 ( Figure 4 By adopting the cross arrangement of the first convex portion 61 and the second convex portion 71, the possibility of fusion welding can be greatly reduced.

[0065] Of course, the distribution method is different. In this embodiment, only a strip structure is given as an example, but it is not limited to the strip structure. It can also be as follows Figure 5-6As shown, the first convex portion 61 and the second convex portion 71 are both bosses (trapezoidal, circular, square, irregular, etc.), the first concave portion 62 and the second concave portion 72 surround the bosses, and the bosses partially overlap, which is also applicable.

[0066] The relationship between the first convex parts 61 and the relationship between the second convex parts 71 can be distributed regularly or randomly. No matter which arrangement is adopted, the overlap area is reduced or there are recesses, which can effectively reduce the possibility of fusion welding.

[0067] The random distribution method is very simple and will not be described in detail here.

[0068] There are many forms of regular distribution, such as the first convex portion 61 and the second convex portion 71 appearing once or multiple times per a certain unit area, or appearing once or multiple times at a certain angle, or appearing once or multiple times at a certain distance, or simply the first convex portion 61 and the second convex portion 71 are arranged according to certain lines (arcs, wavy lines, straight lines) or patterns. For example, if the first convex portion 61 and the second convex portion 71 appear once at a certain distance, Figure 2-4 As shown, the first convex portion 61 is a strip-shaped structure, the first concave portion 62 is a strip-shaped groove, and each adjacent two first convex portions 61 are separated by the first concave portion 62, and the width of the first concave portion 62 is uniform. Similarly, the second convex portion 71 is a strip-shaped structure, the second concave portion 72 is a strip-shaped groove, and each adjacent two second convex portions 71 are separated by the second concave portion 72, and the width of the second concave portion 72 is uniform.

[0069] The shapes of the first convex portion 61 and the second convex portion 71 are also varied. For example, they may be strip-shaped structures (such as Figure 2-4 As shown, no further description is given here), it can also be in the form of a boss. Figure 6-7 As shown, the first convex portion 61 is a boss, and the first concave portion 62 is a groove surrounding the first convex portion 61. The second convex portion 71 is a boss, and the second concave portion 72 is a groove surrounding the second convex portion 71. Here, the cross-sectional shape of the boss can be circular, square, trapezoidal, rectangular, or even some irregular shapes.

[0070] In order to increase the current carrying area, the contact surface 67 of the first contact 60 and the contact surface 67 of the second contact 70 are mutually matching inclined surfaces. The inclined surfaces here are specifically as follows: since the first contact 60 and the second contact 70 are columnar structures, of course, the columnar structures here include both cylinders and elliptical cylinders, as well as polyhedrons such as triangular prisms and quadrangular prisms. Both the first contact 60 and the second contact 70 have an axis P portion. Taking the first contact 60 as an example, the inclined surface and the axis P portion are not in a traditional vertical relationship, but are set at an angle A. In this embodiment, the angle A here is 80°, that is, the inclined surface is equivalent to an angle of 170° in the horizontal direction (the angle between the traditional contact surface 67 and the horizontal direction is 180°). Compared with the traditional contact surface 67, such an inclined surface design can be provided with more first convex portions 61 and second convex portions 71 to increase the current carrying area. Of course, the angle A here does not have to be set to 80°, it can be 88°≥A≥60°, for example, it can be 60°, 70°, 75°, 80°, 88°, etc. It is worth mentioning that the inclined plane set at the angle A with the axis P here is not limited to Figure 7 The inclined plane in the perspective shown should include all different planes that form an angle A with the axis P from the perspective of three-dimensional space.

[0071] In this embodiment, the first contact 60 and the second contact 70 are both fixed by welding, the first contact 60 is welded to the moving contact bridge 30, and the second contact 70 is welded to the stationary contact assembly 10. The welding here can be welding between two planes, welding between a plane and a surface having a concave-convex structure T, or welding between two surfaces having a concave-convex structure T.

[0072] like Figure 8-11 As shown, taking the welding of a plane and a surface with a concave-convex structure T as an example, the upper surface of the second contact 70 is the second welding surface 70a, which is a plane. The lower surface of the stationary contact assembly 10 is provided with a second welding surface 10a, and the second welding surface 10a is a surface with a concave-convex structure T. There are many forms of the concave-convex structure T here, and it is serrated in this embodiment. The second welding surface 70a and the second welding surface 10a are welded and fixed, which can increase the welding area and improve the stability of welding. The lower surface of the first contact 60 is the first welding surface 60a, which is a plane. The upper surface of the moving contact bridge 30 is provided with a first welding surface 30a, and the first welding surface 30a is a surface with a concave-convex structure T. There are many forms of the concave-convex structure T here, and it is serrated in this embodiment. The first welding surface 60a and the first welding surface 30a are welded and fixed, which can increase the welding area and improve the stability of welding. In order to facilitate the first welding surface 30a to play a positioning effect on the first contact 60, the first welding surface 30a is recessed in the upper surface of the moving contact bridge 30.

[0073] The commonality of the two groups of contact structures of the contactor (structural principle part) is introduced above, and the differences between the two groups in this embodiment are introduced below. In this embodiment, the two groups of contact structures are arranged in different directions, and the inclination directions of the contact surfaces 67 of the two groups of contact structures are different. This different inclination direction can achieve adaptive centering of the contact structure when it is turned on. In addition, the same inclination direction can also be adopted, but the effect of adaptive centering when it is turned on will be lacking.

[0074] The above structure can be applied to the contactor as well as the circuit breaker. For example, Fig.12 As shown, the first contact 60 is welded on the moving contact body 100 (that is, the first contact body), and the second contact 70 is welded on the stationary contact body 200 (that is, the second contact body). Here, the moving contact moving contact body 100 is arranged to rotate to achieve the contact or separation of the two contact surfaces 67. In this embodiment, the upper surface of the stationary contact body 200 is provided with a second welding surface 10a, and the second welding surface 10a is recessed in the upper surface of the stationary contact body 200. The second welding surface 10a is a surface having a concave-convex structure T. There are many forms of the concave-convex structure T here, and it is sawtooth in this embodiment. The second welding surface 70a of the second contact 70 is welded to the second welding surface 10a. The lower surface of the moving contact body 100 is provided with a first welding surface 30a, and the first welding surface 30a is recessed in the lower surface of the moving contact body 100. The first welding surface 30a is a surface having a concave-convex structure T. There are many forms of the concave-convex structure T here, and it is sawtooth in this embodiment. The first welding surface 60a of the first contact 60 is fixed to the first welding surface 30a by welding, which can increase the welding area and improve the welding stability.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0076] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A contact structure, comprising a first contact and a second contact; the first contact and the second contact both have a contact surface, and the first contact and / or the second contact are movably arranged to achieve contact or separation of the two contact surfaces; characterized in that: At least one of the two contact surfaces is a concave-convex surface, the concave-convex surface includes a convex portion and a concave portion, the height difference between the convex portion and the concave portion is not less than 0.01 mm, and the convex portion is used to contact the other contact surface.

2. A contact structure according to claim 1, characterized in that: The contact surface of the first contact is a first concave-convex surface, which includes at least two first convex portions and a first concave portion, the first concave portion is located near the first convex portion, and the height difference between the first convex portion and the first concave portion is not less than 0.01 mm; the contact surface of the second contact is a second concave-convex surface, which includes at least two second convex portions and a second concave portion, the second concave portion is located near the second convex portion, and the height difference between the second convex portion and the second concave portion is not less than 0.01 mm; the contact between the two contact surfaces is achieved through the contact between the first convex portion and the second convex portion.

3. A contact structure according to claim 2, characterized in that: The distribution mode of each first convex portion in the first concave-convex surface is the same as the distribution mode of each second convex portion in the second concave-convex surface, and the first convex portion and the second convex portion just touch each other to achieve contact between the two contact surfaces; or, the distribution mode of each first convex portion in the first concave-convex surface is different from the distribution mode of each second convex portion in the second concave-convex surface, but one first convex portion has an overlapping part with at least one second convex portion, and the overlapping part of the first convex portion and the second convex portion touches each other to achieve contact between the two contact surfaces.

4. A contact structure according to claim 3, characterized in that: The distribution of the first convex portions in the first concave-convex surface is regular, and the distribution of the second convex portions in the second concave-convex surface is regular; or, the distribution of the first convex portions in the first concave-convex surface is random, and the distribution of the second convex portions in the second concave-convex surface is random.

5. A contact structure according to claim 3, characterized in that: The first convex portion is a strip-shaped structure, the first concave portion is a strip-shaped groove, and two adjacent first convex portions are separated by the first concave portion; or, the second convex portion is a strip-shaped structure, the second concave portion is a strip-shaped groove, and two adjacent second convex portions are separated by the second concave portion; or, the first convex portion is a boss, and the first concave portion is a groove surrounding the first convex portion; or, the second convex portion is a boss, and the second concave portion is a groove surrounding the second convex portion.

6. A contact structure according to claim 2, characterized in that: The first convex portion is a strip-shaped structure, the first concave portion is a strip-shaped groove, and two adjacent first convex portions are separated by the first concave portion; the second convex portion is a strip-shaped structure, the second concave portion is a strip-shaped groove, and two adjacent second convex portions are separated by the second concave portion; the first convex portion and the second convex portion are arranged crosswise.

7. A contact structure according to claim 1, characterized in that: The first contact and the second contact are columnar structures, the contact surface of the first contact and the contact surface of the second contact are mutually matching inclined surfaces, there is an angle A between the contact surface of the first contact and the axial direction of the first contact, and the angle 88°≥A≥60°.

8. A switch electrical appliance, characterized in that: It comprises a contact assembly, which comprises a first contact body, a second contact body and a contact structure as claimed in any one of claims 1 to 7, wherein the first contact point is fixed on the first contact body, and the second contact point is fixed on the second contact body.

9. A switch device according to claim 8, characterized in that: The first contact body is provided with a first welding surface, the first contact point comprises a first welding surface, the first welding surface is welded to the first welding surface, and the first welding surface and / or the first welding surface is a plane or a surface with a concave-convex structure; Or, a surface of the first contact body is provided with a first welding surface, the first welding surface is recessed in the surface of the first contact body, the first contact point comprises a first welding surface, the first welding surface is welded on the first welding surface, and the first welding surface and / or the first welding surface is a plane or a surface with a concave-convex structure; Or, the second contact body is provided with a second welding surface, the second contact point comprises a second welding surface, the second welding surface is welded to the second welding surface, and the second welding surface and / or the second welding surface is a plane or a surface with a concave-convex structure; Or, a second welding surface is provided on the second contact body, the second welding surface is recessed in the surface of the second contact body, the second contact point includes a second welding surface, the second welding surface is welded on the second welding surface, and the second welding surface and / or the second welding surface is a plane or a surface with a concave-convex structure.

10. A switch device according to claim 8 or 9, characterized in that: The switch is a circuit breaker, the first contact body is a moving contact body, the second contact body is a stationary contact body, the moving contact body is rotatably arranged to achieve contact or separation of two contact surfaces; or, the switch is a contactor or a relay, the first contact body is a moving contact bridge, the second contact body is a stationary contact component, the moving contact bridge is slidably arranged to achieve contact or separation of two contact surfaces, and the moving contact bridge is located next to the first contact point and is provided with an arc striking angle.

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