N-pole structure of a circuit breaker

Abstract

The application discloses an N-pole structure of a circuit breaker, which comprises a middle seat and a cover, the middle seat is internally provided with an N-pole space, the N-pole space is provided with an opening at a first side in the width direction of the middle seat, and the cover is used for closing the opening; the N-pole space is internally provided with an N-pole static contact, an N-pole moving contact, a first flexible connection and a first wiring assembly; the N-pole static contact is connected with the first wiring assembly through the first flexible connection at one end; wherein the N-pole static contact comprises a mounting portion and a first welding portion, the first welding portion is used for welding one end of the first flexible connection, and the mounting portion is used for welding a static contact point; the mounting portion and the first welding portion are arranged in a staggered manner in the width direction; the middle seat comprises a bottom wall, in the width direction, the straight-line distance from the mounting portion to the bottom wall is smaller than the straight-line distance from the first welding portion to the bottom wall; in the width direction, the N-pole moving contact and the static contact point are correspondingly arranged; and the application has the characteristics of high space utilization.

Description

Technical Field

[0001] This application relates to the electrical field, specifically to an N-pole structure for a circuit breaker. Background Technology

[0002] In miniature residual current circuit breakers, the N-pole structure often contains a circuit board, residual current trip unit, N-pole moving contact, N-pole stationary contact, first wiring assembly, second wiring assembly, and other structures.

[0003] The N-pole stationary contact is often fixed to the first wiring assembly using a flexible connection welding method. Existing N-pole stationary contacts can be divided into a stationary contact mounting section and a welding section. The plane containing the centerline of the circuit breaker in the width direction runs through both the stationary contact mounting section and the welding section; simply put, the two are not misaligned in the width direction. For example, the leakage current protection system and circuit breaker for switching equipment disclosed in CN113725040B employs this structure.

[0004] As circuit breakers continue to evolve, the required functions increase, and the protection functions become more precise and sophisticated. This places increasingly higher demands on the control components of the circuit breakers, which in turn requires an increase in the size of the control components. If the internal components of the circuit breaker are not restructured and the size of the control components is simply increased, it will undoubtedly lead to a larger overall size of the circuit breaker.

[0005] In an N-pole structure, the N-pole main conductor still occupies some space. Therefore, how to more rationally arrange the N-pole main conductor becomes the key issue. Summary of the Invention

[0006] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide an N-pole structure for a circuit breaker.

[0007] This application provides: an N-pole structure for a circuit breaker, comprising a center base and a cover. An N-pole space is provided within the center base, with an opening on a first side of the center base in the width direction. The cover is used to close the opening. An N-pole stationary contact, an N-pole moving contact, a first flexible connection, and a first wiring assembly are provided within the N-pole space. One end of the N-pole stationary contact is connected to the first wiring assembly via the first flexible connection. The N-pole stationary contact includes a mounting portion and a first welding portion. The first welding portion is used for welding one end of the first flexible connection, and the mounting portion is used for welding the stationary contact. The mounting portion and the first welding portion are offset in the width direction. The center base includes a bottom wall. In the width direction, the straight-line distance from the mounting portion to the bottom wall is less than the straight-line distance from the first welding portion to the bottom wall. In the width direction, the N-pole moving contact and the stationary contact are correspondingly arranged.

[0008] In some embodiments of this application, the mounting portion includes a mounting section and a bending section; in the length direction, the mounting section and the bending section are arranged sequentially and connected; the N-pole stationary contact also includes an inclined extension portion, which extends along a composite direction of the width and height directions, with one end of the inclined extension portion connected to the bending section and the other end connected to the first welding portion.

[0009] In some embodiments of this application, the mounting section further includes a stationary contact arc segment, wherein the stationary contact arc segment, the mounting section, and the bending section are arranged sequentially and connected in the length direction.

[0010] In some embodiments of this application, the first wiring assembly includes a first wiring frame and a first terminal plate. The first terminal plate includes a second welding portion for welding the other end of the first flexible connection. In the width direction, the imaginary center plane of the first wiring frame passes through the first welding portion, and the straight-line distance from the second welding portion to the bottom wall is less than the straight-line distance from the first welding portion to the bottom wall.

[0011] In some embodiments of this application, the first terminal block includes a first main body and a first wiring portion, with the first wiring portion partially inserted into the first wiring frame; both the first wiring portion and the second welding portion are connected to the first main body, and the first wiring portion and the second welding portion are spaced apart in the width direction; in the height direction, a portion of the second welding portion is located below the first wiring frame for welding to the other end of the first flexible connection.

[0012] In some embodiments of this application, a zero-sequence current transformer is also included. In the length direction, the zero-sequence current transformer is disposed between the first welded portion and the second welded portion, and the first flexible connection passes through the central hole of the zero-sequence current transformer.

[0013] In some embodiments of this application, an arc-starting plate and a second wiring assembly are also included. The arc-starting plate includes an arc-starting part and a fixing part. The arc-starting part and the fixing part are staggered in the width direction. In the width direction, the straight-line distance from the arc-starting part to the bottom wall is less than the straight-line distance from the fixing part to the bottom wall. The fixing part has a welding surface, which is welded to the second wiring assembly. The welding surface is perpendicular to the width direction. In the width direction, the arc-starting part and the N-pole moving contact are correspondingly arranged, and the two are at the same potential.

[0014] In some embodiments of this application, the arc-inducing part includes a movable arc-inducing segment, an avoidance bending segment, and a connecting segment. The fixing part is connected to one side of the connecting segment in the width direction; the avoidance bending segment is connected to one side of the connecting segment in the length direction and extends along the height direction; the movable arc-inducing segment is connected to one side of the avoidance bending segment in the height direction; and the avoidance bending segment is used to avoid the extreme position of the N-pole movable contact.

[0015] In some embodiments of this application, the fixing part includes a fixing section and an inclined section. The welding surface is located on the fixing section, and the inclined section is used to connect to one side of the connecting section in the width direction. The inclined section extends along a composite direction of the width direction and the height direction. In the height direction, the fixing section is positioned lower than the connecting section.

[0016] In some embodiments of this application, the second wiring assembly includes a second wiring frame and a second terminal board. The second terminal board includes a second main body, a second wiring portion, and a third welding portion. The second wiring portion is partially inserted into the second wiring frame. The third welding portion is connected to one side of the second main body in the width direction and extends in the length direction. The fixing portion is welded to one side of the third welding portion in the width direction. The N-pole moving contact is connected to the other side of the third welding portion in the width direction through a second flexible connection, forming an equipotential relationship between the arc-starting portion and the N-pole moving contact.

[0017] The advantages of this application compared to the prior art are: By redesigning the stationary contact of the N pole, the N pole stationary contact includes a mounting part and a first welding part that are staggered in the width direction. The mounting part is closer to the bottom wall of the intermediate seat than the first welding part. This is equivalent to offsetting the mounting part compared to the prior art. The space created by the offset of the mounting part (the mounting part is on one side in the width direction) can be fully utilized. This extra space can be used to accommodate other components inside the circuit breaker. Therefore, this structure has a higher space utilization rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 An exploded schematic diagram of a residual current circuit breaker according to an embodiment of this application is shown; Figure 2 A schematic diagram of the main conductor in the N-pole space is shown in an embodiment of this application; Figure 3 A schematic diagram of the N-pole stationary contact, the first flexible connection, and the first wiring assembly in an embodiment of this application is shown; Figure 4 A schematic diagram of the N-pole stationary contact in an embodiment of this application is shown; Figure 5 A schematic diagram of the first terminal board in an embodiment of this application is shown; Figure 6A schematic diagram of the N-pole moving contact, the second flexible connection, the arc-leading part, and the second wiring assembly in an embodiment of this application is shown. Figure 7 A schematic diagram of the arc-drawing portion and the second terminal plate in an embodiment of this application is shown. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed electrical connection, a detachable electrical connection, or an integral connection; they can refer to a mechanical-electrical connection or an electro-electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0025] like Figures 1-7 As shown, an embodiment of this application is a residual current circuit breaker, which has an L-pole structure and an N-pole structure.

[0026] Its N-pole structure includes a middle seat 100 and a cap 200.

[0027] An N-pole space 100a is provided on the middle seat 100, and this N-pole space 100a has an opening on the first side of the width direction F2 of the middle seat 100.

[0028] The N-pole space 100a is used to house the N-pole components of the circuit breaker. These N-pole components include the N-pole stationary contact 110, the N-pole moving contact 160, the first flexible connection 120, the first wiring assembly 130, the arc-starting piece 140, the second wiring assembly 150, the zero-sequence current transformer 300, the circuit board, the trip unit, etc.

[0029] The cover 200 is spliced ​​with the middle seat 100 and then fastened with rivets. The assembled cover 200 can close the N pole space 100a, that is, the cover 200 is open.

[0030] The N-pole stationary contact 110 and the center seat 100 are fixed.

[0031] Here, the N-pole stationary contact 110 includes a mounting part 110a and a first welding part 110b. The mounting part 110a is used to mount the stationary contact, specifically by welding.

[0032] The first welding part 110b is used to weld one end of the first flexible connection 120, and the first wiring assembly 130 is used to weld the other end of the first flexible connection 120. In this way, the stationary contact of the N-pole structure can be connected to the load circuit through the first wiring assembly 130.

[0033] In the width direction F2, the mounting portion 110a and the first welding portion 110b are offset. Specifically, with reference to the bottom wall 101 of the middle seat 100, the mounting portion 110a is closer to the bottom wall 101 than the first welding portion 110b. In other words, in the width direction F2, the straight-line distance d1 from the mounting portion 110a to the bottom wall 101 is less than the straight-line distance d2 from the first welding portion 110b to the bottom wall 101.

[0034] The N-pole moving contact 160 and the intermediate seat 100 are rotatably connected, specifically through the N-pole contact support to form a rotatable connection. Here, the N-pole moving contact 160 is positioned corresponding to the stationary contact in the width direction F2. This corresponding arrangement means that during closing, as the N-pole moving contact 160 rotates, it can contact the stationary contact.

[0035] In the prior art, the mounting portion 110a and the first welding portion 110b of the stationary contact are basically aligned in the width direction F2, without any misalignment. This wastes the space of the mounting portion 110a on the width direction F2 side. By adopting the misaligned arrangement of this application, the mounting portion 110a is brought closer to the bottom wall 101 of the intermediate seat 100, thus reserving some space in the width direction F2 of the mounting portion 110a to accommodate other components inside the circuit breaker. This results in a very high space utilization rate for the structure.

[0036] There are many ways to form this misalignment. It can be achieved by using multiple bending structures (more than two) or by using a small number of bending structures (two or fewer). Here, we take the example of forming a misalignment structure with a small number of bending structures. The mounting part 110a includes a mounting section 1101 and a bending section 1102. These two sections are arranged sequentially and connected in the length direction F1. The inclined extension 110c extends along the combined direction of the width direction F2 and the height direction F3. One end of the inclined extension 110c is connected to the bending section 1102, and the other end is connected to the first welding part 110b. Through this inclined extension 110c, the mounting part 110a and the first welding part 110b can be misaligned. At the same time, the total number of bending times of the stationary contact structure is relatively small. Compared with other misalignment schemes with a large number of bending times, this structure can minimize the increase in internal resistance caused by bending.

[0037] The mounting section 110a also includes a stationary arc-leading segment 1103, which is connected to the end of the mounting section 1101 away from the bending section 1102 in the length direction F1. In other words, in the length direction F1, the stationary arc-leading segment 1103, the mounting section 1101, and the bending section 1102 are arranged sequentially and connected. The stationary arc-leading segment 1103 facilitates the transfer of the arc on the stationary contact during disconnection.

[0038] The first wiring assembly 130 includes a first wiring frame 130a and a first terminal plate 130b. The first terminal plate 130b includes a second welding portion 1301, and the other end of the first flexible connection 120 is welded to the second welding portion 1301.

[0039] In the width direction F2, the straight-line distance from the second welded part 1301 to the bottom wall 101 is less than the straight-line distance from the first welded part 110b to the bottom wall 101. This means the second welded part 1301 is closer to the bottom wall 101 than the first welded part 110b. Simultaneously, the imaginary center plane P1 of the first wiring frame 130a penetrates the first welded part 110b. This arrangement makes the internal wiring components more rationally configured and the internal structure more compact.

[0040] The first terminal block 130b includes a first main body 1302 and a first wiring portion 1303, where the first wiring portion 1303 partially extends into the first wiring frame 130a. Both the first wiring portion 1303 and the second welding portion 1301 are connected to the first main body 1302. The first wiring portion 1303 and the second welding portion 1301 are spaced apart in the width direction F2, with the second welding portion 1301 being closer to the bottom wall 101 than the first wiring portion 1303. Furthermore, in the height direction F3, a portion of the second welding portion 1301 is located below the first wiring frame 130a, and this extension is used for welding to the other end of the first flexible connection 120. This structure allows for a more compact arrangement of the wiring components, the first flexible conductor, etc., making efficient use of the internal space of the circuit breaker.

[0041] Along the length direction F1, the zero-sequence current transformer 300 is disposed between the first welding part 110b and the second welding part 1301, and the first flexible connection 120 passes through the center hole of the zero-sequence current transformer 300.

[0042] The arc-initiating plate 140 includes an arc-initiating part 140a and a fixing part 140b. In the width direction F2, the arc-initiating part 140a and the fixing part 140b are also staggered, that is, the straight-line distance from the arc-initiating part 140a to the bottom wall 101 is less than the straight-line distance from the fixing part 140b to the bottom wall 101.

[0043] The fixing part 140b has a welding surface 1401, which is welded to the second wiring assembly 150. The welding surface 1401 is perpendicular to the width direction F2. In the width direction F2, the arc-starting part 140a and the N-pole moving contact 160 are correspondingly arranged and are at the same potential. Here, "at the same potential" means that both the N-pole moving contact 160 and the arc-starting part 140a are electrically connected to the second wiring assembly 150. Specifically, the N-pole moving contact 160 is welded to the second wiring assembly 150 through the second flexible connection 170, while the arc-starting part 140a is directly welded to the second wiring assembly 150.

[0044] The equipotential arc-guiding piece 140 with this staggered arrangement is more suitable for the N-pole moving contact 160, and facilitates the guidance of the arc when the N-pole moving contact 160 is broken.

[0045] The arc-initiating section 140a includes a movable arc-initiating segment 1402, a bend-avoiding segment 1403, and a connecting segment 1404.

[0046] Here, the fixing part 140b is connected to one side of the connecting section 1404 in the width direction F2.

[0047] The avoidance bend segment 1403 is connected to the connecting segment 1404 on the length direction F1 side, and the avoidance bend segment 1403 extends along the height direction F3.

[0048] The movable trigger arc segment 1402 is connected to one side of the avoidance bending segment 1403 in the height direction F3.

[0049] The avoidance bend section 1403 is designed to avoid the N-pole moving contact 160, specifically to avoid the extreme position reached when the N-pole moving contact 160 breaks.

[0050] This structure not only ensures that the moving contact arc-inducing segment 1402 guides the arc when the N-pole moving contact 160 is broken, but also allows the avoidance bending segment 1403 to avoid the N-pole moving contact 160, and makes the overall structure of the arc-inducing part 140a simpler and more compact.

[0051] Regarding the fixing part 140b, it includes a fixing section 1405 and an inclined section 1406.

[0052] Here, the welding surface 1401 is located on the fixed section 1405. One end of the inclined section 1406 is connected to one side of the fixed section 1405 in the height direction F3, and the other end is connected to one side of the connecting section 1404 in the width direction F2. The inclined section 1406 extends along the combined direction of the width direction F2 and the height direction F3. In general, in the height direction F3, the fixed section 1405 is positioned lower than the connecting section 1404.

[0053] The design of the inclined section 1406 and the fixed section 1405 facilitates welding with the second wiring assembly 150 and minimizes the overall number of bends in the arc-starting section 140a.

[0054] The second wiring assembly 150 includes a second wiring frame 150a and a second terminal block 150b.

[0055] The second terminal block 150b includes a second main body 1501, a second wiring part 1502, and a third welding part 1503.

[0056] The second wiring portion 1502 is connected to the second main body portion 1501. A portion of the second wiring portion 1502 is inserted into the second wiring frame 150a. The N-pole moving contact 160 can be connected to the load circuit through the second wiring assembly 150.

[0057] The third welding part 1503 is connected to one side of the second main body part 1501 in the width direction F2 and extends toward the length direction F1.

[0058] The third welding part 1503 has two surfaces in the width direction F2, one of which is welded to the fixing part 140b and the other is welded to the second flexible connection 170.

[0059] The specific structure of this second wiring assembly 150 makes the overall structure more compact and also facilitates the soldering of the internal conductors.

[0060] The first flexible connection 120 and the second flexible connection 170 mentioned above are essentially flexible conductors, such as soft connectors, soft copper wire braids, soft wires, etc.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An N-pole structure of a circuit breaker, comprising a base and a cover, wherein an N-pole space is disposed within the base, and an opening is provided on a first side of the N-pole space in the width direction of the base, the cover being used to close the opening; an N-pole stationary contact, an N-pole moving contact, a first flexible connection, and a first wiring assembly are disposed within the N-pole space; one end of the N-pole stationary contact is connected to the first wiring assembly via the first flexible connection; characterized in that: The N-pole stationary contact includes a mounting portion and a first welding portion. The first welding portion is used for welding one end of the first flexible connection, and the mounting portion is used for welding the stationary contact. The mounting portion and the first welding portion are offset in the width direction. The middle seat includes a bottom wall. In the width direction, the straight-line distance from the mounting portion to the bottom wall is less than the straight-line distance from the first welding portion to the bottom wall. In the width direction, the N-pole moving contact and the stationary contact are set accordingly.

2. The N-pole structure of a circuit breaker according to claim 1, characterized in that: The mounting section includes a mounting segment and a bending segment; in the length direction, the mounting segment and the bending segment are arranged sequentially and connected; the N-pole stationary contact also includes an inclined extension, which extends along a composite direction of the width and height directions, with one end of the inclined extension connected to the bending segment and the other end connected to the first welding section.

3. The N-pole structure of a circuit breaker according to claim 2, characterized in that: The mounting section also includes a stationary contact arc segment. In the length direction, the stationary contact arc segment, the mounting section, and the bending section are arranged sequentially and connected.

4. The N-pole structure of a circuit breaker according to claim 1, characterized in that: The first wiring assembly includes a first wiring frame and a first terminal plate. The first terminal plate includes a second welding part for welding the other end of the first flexible connection. In the width direction, the imaginary center plane of the first wiring frame passes through the first welding part, and the straight-line distance from the second welding part to the bottom wall is less than the straight-line distance from the first welding part to the bottom wall.

5. The N-pole structure of a circuit breaker according to claim 4, characterized in that: The first terminal block includes a first main body and a first wiring part, with the first wiring part partially inserted into the first wiring frame; both the first wiring part and the second welding part are connected to the first main body, and the first wiring part and the second welding part are spaced apart in the width direction; in the height direction, a portion of the second welding part is located below the first wiring frame for welding to the other end of the first flexible connection.

6. The N-pole structure of a circuit breaker according to claim 4, characterized in that: It also includes a zero-sequence current transformer, which is disposed between the first welded part and the second welded part in the length direction, and the first flexible connection passes through the central hole of the zero-sequence current transformer.

7. The N-pole structure of a circuit breaker according to claim 1, characterized in that: It also includes an arc-starting plate and a second wiring assembly. The arc-starting plate includes an arc-starting part and a fixing part. The arc-starting part and the fixing part are staggered in the width direction. In the width direction, the straight-line distance from the arc-starting part to the bottom wall is less than the straight-line distance from the fixing part to the bottom wall. The fixing part has a welding surface, which is welded to the second wiring assembly. The welding surface is perpendicular to the width direction. In the width direction, the arc-starting part and the N-pole moving contact are correspondingly arranged, and the two are at the same potential.

8. The N-pole structure of a circuit breaker according to claim 7, characterized in that: The arc-inducing part includes a moving contact arc-inducing segment, an avoidance bending segment, and a connecting segment. The fixed part is connected to one side of the connecting segment in the width direction; the avoidance bending segment is connected to one side of the connecting segment in the length direction and extends along the height direction; the moving contact arc-inducing segment is connected to one side of the avoidance bending segment in the height direction. The avoidance bending segment is used to avoid the extreme position of the N-pole moving contact.

9. The N-pole structure of a circuit breaker according to claim 8, characterized in that: The fixing part includes a fixing section and an inclined section. The welding surface is located on the fixing section. The inclined section is used to connect to one side of the connecting section in the width direction. The inclined section extends along the composite direction of the width direction and the height direction. In the height direction, the fixing section is lower than the connecting section.

10. The N-pole structure of a circuit breaker according to claim 7, characterized in that: The second wiring assembly includes a second wiring frame and a second terminal board. The second terminal board includes a second main body, a second wiring part, and a third welding part. The second wiring part extends into the second wiring frame. The third welding part is connected to one side of the second main body in the width direction and extends in the length direction. The fixed part is welded to one side of the third welding part in the width direction, and the N-pole moving contact is connected to the other side of the third welding part in the width direction through the second flexible connection, forming an equipotential relationship between the arc-starting part and the N-pole moving contact.

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