Electromagnetic tripping mechanism and contact system

Abstract

The utility model discloses an electromagnetic tripping mechanism and a contact system. The electromagnetic tripping mechanism comprises an iron core support, a movable iron core, a static iron core and a reset spring. The movable iron core is rotationally arranged on the iron core support, the static iron core is of a U-shaped structure, and when a to-be-protected circuit is short-circuited, attraction force generated by the static iron core attracts the movable iron core to rotate; one end of the reset spring is connected with the movable iron core, the other end of the reset spring is connected with the iron core support or the static iron core, and the reset spring is used for applying acting force opposite to the attractive force to the movable iron core; the acting force is greater than the attraction force during no short circuit, and is smaller than the attraction force during short circuit; the electric connector further comprises a conducting bar which is an integrated piece. The conducting bar comprises a connecting section, a joining section and a wiring section, the connecting section is connected with the wiring section through the joining section, the connecting section is used for being welded with the flexible connector, and a mounting hole is formed in the wiring section for wiring; the width size of the connecting section and the width size of the wiring section are both larger than the width size of the connecting section, and the iron core support and the static iron core are arranged near the connecting section. The utility model has the characteristic of low temperature rise.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment and is a circuit breaker, specifically an electromagnetic tripping mechanism of the circuit breaker. Background Art

[0002] For example, CN116742582A discloses a short-circuit protection structure for a circuit breaker, which includes a static iron core, a moving iron core, a rotating shaft, a thermal element, a first connecting plate, a second connecting plate and other components.

[0003] One end of the connecting plate 1 is used for wiring, the other end of the connecting plate 1 is welded to the end 2 of the connecting plate, the other end of the connecting plate 2 is welded to one end of the thermal element, and the other end of the thermal element is used to weld a soft link to achieve connection with the moving contact of the circuit breaker.

[0004] It can be seen that the conductive bar in the existing short-circuit protection structure has too many welding positions. Such too many welding points easily cause the temperature rise of the conductive bar to be too high, which is extremely disadvantageous to the performance of the product.

[0005] Therefore, how to design an electromagnetic tripping mechanism that can reduce the temperature rise as much as possible is a direction worthy of research. Summary of the invention

[0006] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide an electromagnetic tripping mechanism and a contact system to reduce the temperature rise as much as possible.

[0007] The present application provides: an electromagnetic tripping mechanism, which includes an iron core bracket, a moving iron core, a static iron core and a reset spring; the moving iron core is rotatably arranged on the iron core bracket, and the static iron core is a U-shaped structure. When a short circuit occurs in the circuit to be protected, the attraction generated by the static iron core attracts the moving iron core to rotate; one end of the reset spring is connected to the moving iron core, and the other end is connected to the iron core bracket or the static iron core, and the reset spring is used to give the moving iron core a force opposite to the attraction; when there is no short circuit, the force is greater than the attraction, and when there is a short circuit, the force is less than the attraction; wherein, it also includes a conductive bar, which is an integral part; the conductive bar includes a connecting section, a linking section and a wiring section, the connecting section is connected to the wiring section through the connecting section, the connecting section is used for welding with the soft connection, and the wiring section is provided with a mounting hole for wiring; the width dimension of the connecting section and the width dimension of the wiring section are both greater than the width dimension of the connecting section, and the iron core bracket and the static iron core are arranged near the connecting section.

[0008] With this structure, a conductive bar of one piece is used to replace the three components of the prior art, namely, the thermal element, the first connecting plate, and the second connecting plate, which is equivalent to at least two fewer welding positions than the prior art, which is conducive to reducing the temperature rise. Secondly, the core bracket and the static core are arranged near the connecting section, and the width of the connecting section is smaller than that of other sections, so that the space occupied by the core bracket, the static core, etc. can be reduced as much as possible, and the structure can be arranged more compactly.

[0009] In some embodiments of the present application, the core bracket and the static core are fixed to the lower surface of the connecting section by fasteners.

[0010] By adopting this structure, the core support and the static core are directly fixed to the connecting section, which not only makes these parts form a component, but also facilitates assembly. Compared with the prior art structure in which the core support and the static core are fixed on the base, this structure can reduce the number of openings on the base and improve the insulation performance of the base.

[0011] In some embodiments of the present application, the core bracket includes two bracket side arms and a bracket bottom arm, and the lower ends of the two bracket side arms are connected through the bracket bottom arm; the static iron core includes two core side arms and a core bottom arm, and the lower ends of the two core side arms are connected through the core bottom arm; the fasteners pass through the bracket bottom arm, the core bottom arm and the connecting section in sequence to fix them.

[0012] The use of this structure will facilitate the installation of the core bracket, the static core and the connecting section.

[0013] In some embodiments of the present application, the two iron core side arms have a first attraction surface, and when a short circuit occurs in the circuit to be protected, the first attraction surface is used to attract the moving iron core to rotate; a limiting baffle is provided on at least one bracket side arm, and the limiting baffle is used to block the moving iron core to prevent the force of the reset spring from causing the moving iron core to deflect and transition.

[0014] With this structure, the setting of the limit baffle can effectively ensure that the moving iron core is in a reasonable position and prevent the moving iron core from deflecting excessively.

[0015] In some embodiments of the present application, a hook portion is provided on the second surface of at least one core side arm, and the hook portion is used to be connected to the reset spring; the first attraction surface is facing the connecting section, and the second surface is facing the wiring section.

[0016] Adopting this structure will be beneficial to the installation of the return spring.

[0017] In some embodiments of the present application, a bimetallic strip is further provided on the upper surface of the connecting section. The bimetallic strip includes a fixed section and a movable section. The fixed section is fixed to the connecting section, and the movable section extends in a direction away from the upper surface of the connecting section.

[0018] With this structure, the bimetallic strip can be used to achieve overload protection, and the bimetallic strip with this structure is easier to install.

[0019] In some embodiments of the present application, a bimetallic strip is also included, which includes a fixed section and a movable section. A limiting groove is provided on the upper surface of the connecting section, and the fixed section is arranged in the limiting groove and fixed to the connecting section. The fixed section has at least three side walls in different directions that are against the limiting groove, and the movable section extends in a direction away from the upper surface of the connecting section.

[0020] This structure is convenient for assembling the bimetallic strip and can be used to realize overload protection.

[0021] In some embodiments of the present application, the conductive bar is a flat structure. In the width direction of the conductive bar, both sides of the connecting section are narrower than the connecting section and the wiring section, so a groove structure is formed on both sides of the width direction of the connecting section; a part of the static iron core and a part of the iron core bracket are inserted into the groove structure.

[0022] By adopting this method, the slot-type structure is utilized to make the structure between the static iron core, the iron core bracket and the conductive bar more compact, thus avoiding occupying too much width space.

[0023] In some embodiments of the present application, at least two soft connection grooves are formed on the connection segment, and the soft connection grooves are arranged in sequence on the connection segment along the width direction of the conductive bar.

[0024] With this structure, the design of the soft connection slot will facilitate the connection between the conductive bar and the moving contact.

[0025] A contact system comprises a rotating shaft and a contact spring, wherein at least one contact installation space is arranged on the rotating shaft, and at least two movable contacts arranged side by side are arranged in the contact installation space; wherein, it also comprises the above-mentioned electromagnetic tripping mechanism, wherein one end of the movable contact is welded to the connecting section through a soft connection; and the movable contact is provided with a hanging part, and a through hole is opened on the hanging part, and the through hole is used to be connected to one end of the contact spring.

[0026] Compared with the hanging structure in the form of an inverted hook in the prior art, this structure uses a through hole on the hanging part, which can make the contact spring hang more stably.

[0027] In some embodiments of the present application, an insulating partition corresponding to each contact installation space is also included, and the movable contact in the corresponding contact installation space is passed through the insulating partition. The design of the partition can effectively reduce the arc gas spraying toward the direction of the movable contact, protecting the movable contact and other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 A schematic diagram showing the structure of a conductive member in an electromagnetic tripping mechanism according to an embodiment of the present application is shown;

[0030] Figure 2 A schematic diagram of the structure of the electromagnetic tripping mechanism according to an embodiment of the present application is shown;

[0031] Figure 3 A schematic structural diagram of the electromagnetic tripping mechanism of an embodiment of the present application from another perspective is shown;

[0032] Figure 4 A cross-sectional view of an electromagnetic tripping mechanism according to an embodiment of the present application is shown;

[0033] Figure 5 A schematic structural diagram of a contact system of a circuit breaker according to an embodiment of the present application is shown;

[0034] Figure 6 A cross-sectional view of a contact system of a circuit breaker according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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

[0040] like Figure 1-Figure 6 As shown, an embodiment of the present application is an electromagnetic tripping mechanism, which is used in a molded case circuit breaker to achieve short-circuit protection.

[0041] The electromagnetic tripping mechanism includes an iron core support 100 , a moving iron core 101 , a stationary iron core 102 , a conductive bar 103 , a return spring 104 , and a bimetallic strip 105 .

[0042] The assembly structure formed by the core support 100, the moving core 101, the stationary core 102, the conductive bar 103, and the reset spring 104 can realize instantaneous protection, also called short-circuit protection, that is, when a short circuit occurs in the main circuit, the rotation of the moving core 101 will push the traction rod of the operating mechanism to move, thereby realizing protection. The specific structures of the above-mentioned components are as follows:

[0043] The conductive bar 103 is an integral part. Here, the conductive bar 103 is in the shape of a flat plate. The conductive bar 103 may also be in the shape of a straight line in the length direction.

[0044] The conductive bar 103 includes a connecting section 103a, a connecting section 103b and a wiring section 103c. The connecting section 103a is used to connect to the soft link 202. The connecting section 103a is provided with a soft link slot 103a1. In this embodiment, the number of the soft link slots 103a1 is 5, and the 5 soft link slots 103a1 are arranged in sequence along the width direction of the connecting section 103a. Here, the number of the soft link slots 103a1 is determined according to the number of the moving contacts 201. When the number of the moving contacts 201 is two, the number of the soft link slots 103a1 can also be set to only two.

[0045] The wiring segment 103c is used for wiring. Two holes are provided on the wiring segment 103c. The two holes are used to cooperate with fastening bolts so as to connect the wiring segment 103c with external lines.

[0046] The connecting section 103 b is used to install the bimetallic strip 105 , the core support 100 and the static core 102 .

[0047] The width dimension of the connecting section 103b here is smaller than the width dimension of the wiring section 103c, and is also smaller than the width dimension of the connecting section 103a. In some embodiments of the present application, the conductive bar 103 is a flat plate structure. In the width direction of the conductive bar 103, both sides of the connecting section 103b are narrower than the connecting section 103a and the wiring section 103c, so a slot structure 103d is formed on both sides of the connecting section 103b in the width direction. This slot structure 103d can accommodate a part of the static iron core 102 and a part of the iron core bracket 100.

[0048] The static core 102 includes two core side arms 102a and a core bottom arm 102b, and the lower ends of the two core side arms 102a are connected through the core bottom arm 102b. Here, the two core side arms 102a pass through the two slot structures 103d respectively, and the core bottom arm 102b is located below the connecting section 103b.

[0049] The core support 100 includes two support side arms 100a and a support bottom arm 100b, and the lower ends of the two support side arms 100a are connected through the support bottom arm 100b. Here, the two support side arms 100a pass through the two slot structures 103d respectively, and the support bottom arm 100b is located below the connecting section 103b.

[0050] The core support 100 is entirely wrapped around the outside of the static core 102, and is fastened by fasteners that pass through the support bottom arm 100b, the core bottom arm 102b and the connecting section 103b in sequence. Here, the fasteners are bolts, and of course, riveting can also be used in addition.

[0051] The two support side arms 100a of the core support 100 are provided with rotation grooves 100a1, and the two sides of the moving core 101 are provided with rotation parts 101a, and the rotation parts 101a are mounted on the rotation grooves 100a1 so that the moving core 101 forms a rotation connection. The side of the core side arm 102a of the static core 102 facing the moving core 101 is the first suction surface 102a1, that is, when a short circuit occurs in the circuit to be protected, the first suction surface attracts the moving core 101 to rotate.

[0052] Here, in order to reset the moving iron core 101, the return spring 104 is hooked on the moving iron core 101 and the static iron core 102. A hook portion 102a3 is provided on the second surface 102a2 of the iron core side arm 102a, where the second surface 102a2 is the surface of the static iron core 102 away from the moving iron core 101. One end of the return spring 104 is hooked on the hook portion 102a3, and the other end is hooked on the moving iron core 101. In the event of a short circuit, the force of the return spring 104 is less than the attraction of the first suction surface 102a1, so the moving iron core 101 rotates. After the short circuit disappears (it can also be said that when no short circuit occurs), the force of the return spring 104 is greater than the attraction of the first suction surface 102a1, and the moving iron core 101 returns to its original position. Here, the second surface 102a2 is a side of the connecting section 103b facing the connecting section 103c, and the first suction surface 102a1 is a side of the connecting section 103b facing the connecting section 103a.

[0053] Of course, the above-mentioned return spring 104 can also be hung on the moving iron core 101 and the iron core bracket 100, which can also achieve the same effect.

[0054] Here, in order to prevent the movable iron core 101 from returning to its original position under the action of the return spring 104, a limit baffle 100ba1 is provided on the bracket side arm 100a, and the limit baffle 100ba1 is used to block the movable iron core 101 to prevent the movable iron core 101 from deflecting and transitioning due to the action of the return spring 104. In this embodiment, the limit baffle 100b1 is provided on each bracket side arm 100a, and in addition, the limit baffle 100ba1 can also be provided on one bracket side arm 100a, while the other bracket side arm 100a is not provided with the limit baffle 100ba1.

[0055] The bimetallic strip 105 is used to achieve overload protection. The bimetallic strip 105 is in an L-shaped structure, including a fixed section 105a and a movable section 105b. A limiting groove 103b1 is provided on the upper surface of the connecting section 103b, and the fixed section 105a is in the limiting groove 103b1. The fixed section 105a is fastened to the limiting groove 103b1 by a fastener, and the fastener is a bolt here. Of course, rivets can also be used. After the fixed section 105 is fixed, the movable section 105b extends in the direction away from the upper surface of the connecting section 103b. The fixed section 105a has four side walls, and three of the side walls are in contact with the groove wall of the limiting groove 103b1. Of course, in addition to being fastened to the limiting groove 103b1, the bimetallic strip 105 can also be fixed to the upper surface of the connecting section 103b.

[0056] The above-mentioned electromagnetic tripping mechanism is mainly used in the contact system of the circuit breaker. The contact system of the circuit breaker includes a rotating shaft 200, on which three contact installation spaces 200a are provided, and the number of electromagnetic tripping mechanisms is also three, corresponding to the three contact installation spaces 200a. Five moving contacts 201 are arranged side by side in each contact installation space 200a, and five soft links 202 respectively connect the five moving contacts 201 with the corresponding five soft connection grooves 103a1, and the connection here is connected by welding. Contact springs 203 are arranged in the contact installation space 200a, and the number of contact springs 203 corresponds to the number of moving contacts 201. A hanging part 201a is arranged on each moving contact 201, and a through hole 201b is provided on the hanging part 201a. One end of the contact spring 203 is connected to the through hole 201b, and the other end is connected to the rotating shaft 200.

[0057] Three insulating partitions 204 are also provided on the rotating shaft 200 . The insulating partitions 204 here correspond to the contact installation spaces 200 a one-to-one. The moving contact 201 in each contact installation space 200 a passes through the corresponding insulating partition 204 .

[0058] Of course, the contact system of this circuit breaker is a three-pole circuit breaker. In addition to being applied to three-pole circuit breakers, the above structure can also be applied to two-pole circuit breakers and four-pole circuit breakers.

[0059] 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.

[0060] 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. An electromagnetic tripping mechanism, comprising an iron core bracket, a moving iron core, a stationary iron core and a reset spring; the moving iron core is rotatably arranged on the iron core bracket, the stationary iron core is a U-shaped structure, when a short circuit occurs in the circuit to be protected, the attraction generated by the stationary iron core attracts the moving iron core to rotate; one end of the reset spring is connected to the moving iron core, and the other end is connected to the iron core bracket or the stationary iron core, and the reset spring is used to give the moving iron core a force opposite to the attraction; when there is no short circuit, the action force is greater than the attraction, and when there is a short circuit, the action force is less than the attraction; it is characterized in that: It also includes a conductive bar, which is an integrated part; the conductive bar includes a connecting section, a linking section and a wiring section, the connecting section and the wiring section are connected through the connecting section, the connecting section is used for welding with the soft link, and the wiring section is provided with a mounting hole for wiring; the width dimension of the connecting section and the width dimension of the wiring section are both larger than the width dimension of the linking section, and the iron core bracket and the static iron core are arranged near the linking section.

2. The electromagnetic tripping mechanism according to claim 1, characterized in that: The iron core bracket and the static iron core are fixed to the lower surface of the connecting section by fasteners.

3. An electromagnetic tripping mechanism according to claim 2, characterized in that: The iron core bracket includes two bracket side arms and a bracket bottom arm, and the lower ends of the two bracket side arms are connected through the bracket bottom arm; the static iron core includes two iron core side arms and a core bottom arm, and the lower ends of the two iron core side arms are connected through the iron core bottom arm; the fasteners pass through the bracket bottom arm, the iron core bottom arm and the connecting section in sequence for fixing.

4. The electromagnetic tripping mechanism according to claim 3, characterized in that: The two iron core side arms have a first attraction surface, which is used to attract the moving iron core to rotate when a short circuit occurs in the circuit to be protected; a limit baffle is provided on at least one bracket side arm, which is used to block the moving iron core to prevent the moving iron core from deflecting and transitioning due to the force of the reset spring.

5. The electromagnetic tripping mechanism according to claim 4, characterized in that: A hook portion is arranged on the second surface of at least one iron core side arm, and the hook portion is used to be connected to the reset spring; the first suction surface is facing the connecting section, and the second surface is facing the wiring section.

6. An electromagnetic tripping mechanism according to any one of claims 1 to 5, characterized in that: A bimetallic strip is also provided on the upper surface of the connecting section. The bimetallic strip includes a fixed section and a movable section. The fixed section is fixed to the connecting section, and the movable section extends in a direction away from the upper surface of the connecting section. Or, it also includes a bimetallic strip, which includes a fixed section and a movable section. A limiting groove is provided on the upper surface of the connecting section, and the fixed section is arranged in the limiting groove and fixed to the connecting section. The fixed section has at least three side walls in different directions that abut against the limiting groove, and the movable section extends in a direction away from the upper surface of the connecting section.

7. The electromagnetic tripping mechanism according to claim 1, characterized in that: The conductive bar is a flat plate structure. In the width direction of the conductive bar, both sides of the connecting section are narrower than the connecting section and the wiring section, so a groove structure is formed on both sides of the width direction of the connecting section; a part of the static iron core and a part of the iron core bracket are inserted into the groove structure.

8. The electromagnetic tripping mechanism according to claim 1, characterized in that: At least two soft connection grooves are formed on the connection section, and the soft connection grooves are arranged in sequence on the connection section along the width direction of the conductive bar.

9. A contact system, comprising a rotating shaft and a contact spring, wherein at least one contact installation space is provided on the rotating shaft, and at least two movable contacts arranged side by side are provided in the contact installation space; characterized in that: It also includes an electromagnetic tripping mechanism as described in any one of claims 1 to 8, wherein one end of the moving contact is welded to the connecting section through a soft connection; a hanging portion is provided on the moving contact, and a through hole is opened on the hanging portion, and the through hole is used to connect to one end of the contact spring.

10. A contact system according to claim 9, characterized in that: It also includes insulating partitions corresponding to the contact installation spaces one by one, and the moving contacts in the corresponding contact installation spaces are passed through the insulating partitions.

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