Contact structure and circuit breaker

Abstract

The application belongs to the technical field of low-voltage electrical apparatus, and discloses a contact structure and a circuit breaker. The contact structure comprises a support frame, two conductive sheet groups and two plate springs. The support frame is provided with two symmetrically arranged accommodating grooves and a guide groove arranged between the two accommodating grooves. The guide groove is used for inserting a first bus bar between the grooves of the two accommodating grooves. The two conductive sheet groups are symmetrically accommodated in the two accommodating grooves respectively. Each conductive sheet group comprises a plurality of conductive sheets, and the conductive sheets extend out of the groove of the accommodating groove. The two plate springs are arranged on the opposite outer sides of the two conductive sheet groups respectively. The plate springs are in contact with the conductive sheet groups. After the first bus bar is inserted into the guide groove, the plate springs can make the conductive sheets generate a clamping force on the first bus bar. The circuit breaker provided by the application comprises the above contact structure. The support frame provides an installation carrier for the installation of the conductive sheet groups and the plate springs, so that the overall structure of the contact is smaller and more compact, and space and materials are saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to a contact structure and a circuit breaker. BACKGROUND

[0002] The drawer-type circuit breaker is composed of a drawer seat and a circuit breaker body. When the circuit breaker body is placed in the drawer seat, it becomes a drawer-type circuit breaker. Generally, the circuit breaker body and the drawer seat are connected through an insertion type electrical connection structure, and the circuit breaker body bus and the drawer seat bus are connected through the insertion type electrical connection structure. This type of pivotal structure is called a bridge type contact.

[0003] The drawer-type circuit breaker is convenient for the circuit breaker body to be pulled out of the drawer seat and to be shaken in. After being shaken in, the bridge type contact connects the copper bus bars on the drawer seat and the body. However, the structure of the existing bridge type contact is relatively complex, and the size of the pressure exerted by the copper conductive sheets on the bridge type contact on the bus bar is unstable. The size of the pressure exerted by the copper conductive sheets on the bridge type contact on the bus bar affects the size of the contact resistance, and further affects the temperature rise of the circuit breaker. Moreover, the size of the pressure determines the size of the short-circuit current that can be passed. SUMMARY

[0004] The purpose of the present application is to provide a contact structure and a circuit breaker, aiming to simplify the contact structure and improve the connection convenience of the conductive sheet group and the leaf spring.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] The contact structure comprises:

[0007] A support frame is provided with two symmetrically arranged accommodating grooves and a guide groove arranged between the two accommodating grooves. The grooves of the two accommodating grooves are oppositely arranged, and the guide groove is used for inserting the first bus bar between the grooves of the two accommodating grooves.

[0008] Two conductive sheet groups are symmetrically accommodated in the two accommodating grooves, respectively. The conductive sheet group comprises a plurality of conductive sheets, and the conductive sheets extend out of the groove of the accommodating groove.

[0009] Two leaf springs are arranged in the two accommodating grooves, respectively, and are arranged on the opposite outer sides of the two conductive sheet groups, respectively. The leaf spring is in contact with the conductive sheet group. After the first bus bar is inserted into the guide groove, the leaf spring can make the conductive sheet generate a clamping force on the first bus bar.

[0010] Optionally, the groove wall of the accommodating groove is provided with a first opening and a second opening opposite to each other. The first opening and the second opening are used for limiting the conductive sheet group and the leaf spring.

[0011] Optionally, the leaf spring comprises a fixed part and a plurality of mutually parallel contact fingers arranged on one side of the fixed part, a plurality of the conductive sheets and a plurality of the contact fingers are in one-to-one correspondence and contact, and the fixed part and the contact fingers are detachably connected with the second opening and the first opening, respectively.

[0012] Optionally, the fixed part is provided with a first reverse buckle at an end away from the contact fingers, and the end of the two outermost contact fingers is provided with a second reverse buckle, and the first reverse buckle and the second reverse buckle are hooked to the second opening and the first opening, respectively.

[0013] Optionally, the conductive sheet is provided with a limiting protrusion, and after the first busbar is inserted into the lead-in groove, the limiting protrusion abuts against the contact finger.

[0014] Optionally, the support frame comprises a main support frame and two side support frames vertically arranged on both ends of the main support frame, and the two accommodating grooves are arranged on the two side support frames, and the lead-in groove is arranged on the main support frame.

[0015] Optionally, the two ends of the conductive sheet are respectively provided with limiting protrusions, and after the conductive sheet is placed in the accommodating groove, the two limiting protrusions are respectively overlapped on the first opening and the second opening.

[0016] Optionally, the conductive sheet is provided with a first protrusion and a second protrusion, the second protrusion and the first protrusion are arranged side by side, the first protrusion protrudes from the slot of the accommodating groove for contacting the first busbar, and the second protrusion protrudes from the slot of the accommodating groove for contacting the second busbar.

[0017] Optionally, the contact surface of the first busbar is provided with an arc-shaped groove, and the leaf spring can make the first protrusion be placed in the arc-shaped groove and generate a clamping force on the first busbar.

[0018] The circuit breaker comprises the contact structure according to any one of the above-mentioned schemes, and the circuit breaker further comprises a first busbar and a second busbar, and the second busbar is provided with a chamfer on the edge of one end close to the first busbar.

[0019] The contact structure provided by the application has the following beneficial effects: the conductive sheet group is accommodated in the accommodating groove, and the leaf spring is also arranged in the accommodating groove, the lead-in groove can be inserted into the first busbar, the support frame is arranged, the installation of the conductive sheet group and the leaf spring is provided with an installation carrier, the overall structure of the contact is smaller and more compact, and space and materials are saved; in addition, after the first busbar is inserted into the lead-in groove, the leaf spring can make the conductive sheet generate a clamping force on the first busbar, the stability of the clamping force is good, and the stability of the short-circuit current passing through the circuit breaker can be improved.

[0020] The circuit breaker provided by the application comprises the contact structure, and the contact structure comprises a support frame, which provides an installation carrier for installation of the conductive sheet group and the leaf spring, so that the overall structure of the contact is smaller, space and materials are saved, and the leaf spring can enable the conductive sheet to generate a clamping force on the first busbar, and the stability of the clamping force is good, thereby improving the stability of the short-circuit current passed by the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a whole schematic view of the contact structure from a perspective provided by an embodiment of the application;

[0022] Figure 2 is a whole schematic view of the contact structure from another perspective provided by an embodiment of the application;

[0023] Figure 3 is a structural schematic view of the support frame from a perspective provided by an embodiment of the application;

[0024] Figure 4 is a structural schematic view of the support frame from another perspective provided by an embodiment of the application;

[0025] Figure 5 is an exploded view of the support frame, the conductive sheet group and the leaf spring when not assembled provided by an embodiment of the application;

[0026] Figure 6 is a structural schematic view of the conductive sheet provided by an embodiment of the application;

[0027] Figure 7 is a structural schematic view of the first busbar provided by an embodiment of the application;

[0028] Figure 8 is a structural schematic view of the leaf spring provided by an embodiment of the application;

[0029] Figure 9 is a structural schematic view of the second busbar provided by an embodiment of the application.

[0030] In the drawings:

[0031] 100, support frame; 110, main support frame; 111, guide slot; 112, first opening; 113, first limiting rod; 114, first leaf spring limiting rod; 120, side support frame; 121, accommodating groove; 122, second opening; 123, third opening; 124, second limiting rod; 125, second leaf spring limiting rod;

[0032] 200, conductive sheet group; 210, conductive sheet; 211, first protrusion; 212, second protrusion; 213, limiting bump; 214, limiting protrusion;

[0033] 300, first busbar; 310, arc-shaped groove;

[0034] 400, second busbar; 410, chamfer;

[0035] 500, plate spring; 510, fixed part; 511, first undercut; 520, contact finger; 521, second undercut. DETAILED DESCRIPTION

[0036] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the application and are not limiting to the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for the purpose of description.

[0037] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of the present embodiment, the terms "upper", "lower", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the purpose of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0040] The present embodiment provides a circuit breaker, which comprises a contact structure, in particular, as Figures 1-9As shown, the contact structure includes a support frame 100, two conductive sheet groups 200 and two plate springs 500, the support frame 100 is provided with two symmetrically arranged accommodating grooves 121 and a guide connecting groove 111 arranged between the two accommodating grooves 121, the grooves of the two accommodating grooves 121 are oppositely arranged, and the guide connecting groove 111 is used for inserting the first bus 300 between the grooves of the two accommodating grooves 121; the two conductive sheet groups 200 are symmetrically accommodated in the two accommodating grooves 121 respectively, the conductive sheet group 200 includes a plurality of conductive sheets 210, and the conductive sheet 210 extends out of the groove of the accommodating groove 121; the two plate springs 500 are arranged in the two accommodating grooves 121 respectively and are arranged on the opposite outer sides of the two conductive sheet groups 200 respectively, the plate spring 500 is in contact with the conductive sheet group 200, and after the first bus 300 is inserted into the guide connecting groove 111, the plate spring 500 can make the conductive sheet 210 generate a clamping force on the first bus 300.

[0041] The contact structure provided in the embodiment has the following advantages: the conductive sheet group 200 is accommodated in the accommodating groove 121, and the plate spring 500 is also arranged in the accommodating groove 121, the guide connecting groove 111 can be used for inserting the first bus 300, the support frame 100 provides a mounting carrier for the installation of the conductive sheet group 200 and the plate spring 500, so that the overall structure of the contact is smaller and saves space and materials; after the first bus 300 is inserted into the guide connecting groove 111, the plate spring 500 can make the conductive sheet 210 generate a clamping force on the first bus 300, and the stability of the size of the clamping force is good, thereby the stability of the short-circuit current passing through the circuit breaker can be improved.

[0042] The circuit breaker provided in the embodiment includes the above-mentioned contact structure, the contact structure includes the support frame 100, the support frame 100 provides a mounting carrier for the installation of the conductive sheet group 200 and the plate spring 500, so that the overall structure of the contact is smaller and saves space and materials, and the plate spring 500 can make the conductive sheet 210 generate a clamping force on the first bus 300, and the stability of the size of the clamping force is good, thereby the stability of the short-circuit current passing through the circuit breaker can be improved.

[0043] In the embodiment, the groove wall of the accommodating groove 121 is provided with opposite first and second openings 112 and 122, the first and second openings 112 and 122 are used for limiting the conductive sheet group 200 and the plate spring 500, so as to improve the installation reliability of the conductive sheet group 200 and the plate spring 500.

[0044] Optionally, referring to Figure 1 , Figure 2 , Figure 5 and Figure 8The plate spring 500 comprises a fixed portion 510 and a plurality of fingers 520 arranged on one side of the fixed portion 510 in parallel with each other, the plurality of conductive sheets 210 and the plurality of fingers 520 are in one-to-one correspondence, and the fixed portion 510 and the fingers 520 are detachably connected with the first opening 112 and the second opening 122 respectively. After the first busbar 300 is inserted into the guide slot 111, the first busbar 300 extrudes the conductive sheet set 200 to the outside, and the plurality of fingers 520 can correspondingly apply a certain pressure to the plurality of conductive sheets 210, so that the conductive sheet set 200 generates a clamping force, and then the conductive sheet set 200 is stably pressed on the first busbar 300; the fixed portion 510 and the fingers 520 are detachably connected with the second opening 122 and the first opening 112 respectively, which is convenient for disassembly. In this embodiment, the number of the fingers 520 is five, and the number of the conductive sheets 210 is also five. In other embodiments, other numbers such as seven or nine can also be set according to needs.

[0045] As shown in Figure 1 , Figure 2 and Figure 8 , in order to improve the convenience of installation of the plate spring 500, the end of the fixed portion 510 away from the fingers 520 is provided with a first undercut 511, and the end of the two outermost fingers 520 is provided with a second undercut 521, and the first undercut 511 and the second undercut 521 are respectively hooked to the second opening 122 and the first opening 112, which is convenient for disassembly. Specifically, the end of the fixed portion 510 away from the fingers 520 is provided with two first undercuts 511, and the two first undercuts 511 are respectively arranged at the two top corners of the fixed portion 510, so as to improve the connection stability of the plate spring 500 and the second opening 122.

[0046] Referring to Figure 6 , in order to improve the extrusion stability of the fingers 520 to the conductive sheets 210, the conductive sheets 210 are provided with limiting protrusions 214, and after the first busbar 300 is inserted into the guide slot 111, the limiting protrusions 214 abut against the fingers 520. After assembly, the limiting protrusions 214 extrude the middle part of the fingers 520, and the plate spring 500 is bent to ensure that the plate spring 500 provides stable pressure to the conductive sheets 210.

[0047] Optionally, the two ends of the conductive sheet 210 are respectively provided with limiting protrusions 213, and after the conductive sheet 210 is placed in the accommodating groove 121, the two limiting protrusions 213 are respectively overlapped on the first opening 112 and the second opening 122, so as to prevent the conductive sheet 210 from shaking and improve the installation stability.

[0048] In the embodiment, the conductive sheet 210 is provided with a first protrusion 211 and a second protrusion 212, the second protrusion 212 is arranged side by side with the first protrusion 211, the first protrusion 211 extends out of the slot of the accommodating groove 121 for contacting the first bus 300, and the second protrusion 212 extends out of the slot of the accommodating groove 121 for contacting the second bus 400. By arranging the first protrusion 211 and the second protrusion 212, the first bus 300, the conductive sheet 210 and the second bus 400 can be effectively ensured to be in full contact, and the contact reliability is improved.

[0049] Preferably, the contact surface of the first bus 300 is provided with an arc-shaped groove 310, and the first protrusion 211 can be arranged in the arc-shaped groove 310 by the plate spring 500 to generate a clamping force on the first bus 300. After the first bus 300 is inserted into the lead-in groove 111, the first protrusion 211 is arranged in the arc-shaped groove 310 of the first bus 300, so that the conductive sheet 210 and the first bus 300 form a circular arc contact, the contact area of the first bus 300 and the conductive sheet 210 is effectively increased, and the contact resistance is reduced, and the temperature rise is reduced.

[0050] Optionally, referring to Figure 3 and Figure 4 , the support frame 100 includes a main support frame 110 and two side support frames 120 vertically arranged at two ends of the main support frame 110, two accommodating grooves 121 are arranged on the two side support frames 120 respectively, and the lead-in groove 111 is arranged on the main support frame 110. The main support frame 110 and the side support frame 120 constitute the support frame 100, which has a simple structure and is easy to manufacture; the two accommodating grooves 121 are arranged on the two side support frames 120 respectively, which facilitates the installation of the conductive sheet group 200, and the lead-in groove 111 is arranged on the main support frame 110, which facilitates the insertion of the first bus 300.

[0051] Specifically, in combination with Figure 3 , Figure 4 and Figure 6As shown, the main support frame 110 is provided with three first openings 112 arranged side by side on the side away from the side support frame 120, and the middle first opening 112 is the slot opening of the guide slot 111, and the first openings 112 on both sides are respectively communicated with the accommodating groove 121, the second opening 122 is arranged on the side of each side support frame 120 away from the main support frame 110, the second opening 122 is communicated with the accommodating groove 121, the first limiting rod 113 is formed between two adjacent first openings 112, the second limiting rod 124 is formed between the second opening 122 and the slot opening of the accommodating groove 121, and the two limiting protrusions 213 of the conductive sheet 210 are respectively overlapped on the first limiting rod 113 and the second limiting rod 124, so that the installation stability of the conductive sheet group 200 is improved. In addition, when the first bus 300 is inserted into the guide slot 111, the two limiting protrusions 213 can be respectively moved up or down in the corresponding first opening 112 and the second opening 122, so that the smooth insertion of the first bus 300 is ensured, and the first opening 112 and the second opening 122 can play the role of movement guiding and limiting of the conductive sheet 210.

[0052] Further, the outer side of each side support frame 120 away from each other is provided with a third opening 123, the third opening 123 is communicated with the accommodating groove 121, the first flat spring limiting rod 114 is formed between the third opening 123 and the first opening 112, and the second flat spring limiting rod 125 is formed between the third opening 123 and the second opening 122, so that the first flat spring limiting rod 114 and the second flat spring limiting rod 125 can effectively prevent the flat spring 500 from being pulled out of the accommodating groove 121 under the action of the pushing force of the conductive sheet group 200 after the first bus 300 is inserted into the guide slot 111. Exemplarily, the first undercut 511 of the flat spring 500 can be hooked on the second flat spring limiting rod 125, and the second undercut 521 of the flat spring 500 can be hooked on the first flat spring limiting rod 114, so as to improve the installation stability of the flat spring 500. Alternatively, the second undercut 521 of the end portion of the two contact fingers 520 on the opposite outermost side can be correspondingly hooked on the main support frame 110 on the two sides of the first flat spring limiting rod 114, and the two first undercuts 511 can be correspondingly hooked on the side support frame 120 on the two sides of the second flat spring limiting rod 125.

[0053] Alternatively, the circuit breaker further comprises a first bus 300 and a second bus 400, and in application, the first bus 300 can be arranged as a drawer seat bus, and the second bus 400 can be arranged as a body bus, the first bus 300 is inserted into the guide slot 111 from one side of the support frame 100, the arc-shaped groove 310 of the first bus 300 is in circular arc contact with the first protrusion 211 of the conductive sheet 210, the flat spring 500 uniformly and stably presses the conductive sheet group 200 on the first bus 300, the second bus 400 is inserted into the two conductive sheet groups 200 from the other side of the support frame 100 by using the rocker, and the second bus 400 is in contact with the conductive sheet 210, so that the first bus 300 and the second bus 400 are electrically connected.

[0054] In this embodiment, as Figure 9 As shown, the edge of the second busbar 400 near the first busbar 300 has a chamfer 410. This design reduces the component force exerted by the conductive sheet 210 on the second busbar 400 in the rocking direction, thereby reducing the rocking torque. In this embodiment, the chamfer 410 is set to 22.5°. In other embodiments, it can also be set to other values, such as 25°, as needed.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A contact structure, characterized in that, include: The support frame (100) has two symmetrically arranged receiving slots (121) and a guide slot (111) between the two receiving slots (121). The slot openings of the two receiving slots (121) are arranged opposite to each other. The guide slot (111) allows the first busbar (300) to be inserted between the slot openings of the two receiving slots (121). Two conductive sheet groups (200) are symmetrically housed in two receiving grooves (121), each conductive sheet group (200) comprising a plurality of conductive sheets (210) extending out of the openings of the receiving grooves (121); and Two leaf springs (500) are respectively disposed in the two receiving grooves (121) and respectively disposed on the opposite outer sides of the two conductive sheet groups (200). The leaf springs (500) are in contact with the conductive sheet groups (200). After the first busbar (300) is inserted into the guide groove (111), the leaf springs (500) can cause the conductive sheet (210) to generate a clamping force on the first busbar (300). The receiving groove (121) has a first opening (112) and a second opening (122) on its groove wall. The first opening (112) and the second opening (122) are used to limit the conductive sheet group (200) and the leaf spring (500). The leaf spring (500) includes a fixing part (510) and a plurality of parallel contact fingers (520) disposed on one side of the fixing part (510). The plurality of conductive sheets (210) are in contact with the plurality of contact fingers (520) in a one-to-one correspondence. The fixing part (510) and the contact fingers (520) are detachably connected to the second opening (122) and the first opening (112) respectively. The conductive sheet (210) has limiting protrusions (213) at both ends. After the conductive sheet (210) is placed in the receiving groove (121), the two limiting protrusions (213) overlap the first opening (112) and the second opening (122) respectively.

2. The contact structure according to claim 1, characterized in that, The fixing part (510) has a first buckle (511) at one end away from the contact finger (520), and the ends of the two outermost contact fingers (520) are provided with second buckles (521). The first buckle (511) and the second buckle (521) are hooked to the second opening (122) and the first opening (112) respectively.

3. The contact structure according to claim 1, characterized in that, The conductive sheet (210) is provided with a limiting protrusion (214). After the first busbar (300) is inserted into the guide groove (111), the limiting protrusion (214) abuts against the contact finger (520).

4. The contact structure according to claim 1, characterized in that, The support frame (100) includes a main support frame (110) and two side support frames (120) respectively vertically disposed at both ends of the main support frame (110). The two receiving slots (121) are respectively disposed on the two side support frames (120), and the guide slot (111) is disposed on the main support frame (110).

5. The contact structure according to claim 1, characterized in that, The conductive sheet (210) is provided with a first protrusion (211) and a second protrusion (212), the second protrusion (212) and the first protrusion (211) are arranged side by side, the first protrusion (211) extends out of the groove of the receiving groove (121) and is used to contact the first busbar (300), the second protrusion (212) extends out of the groove of the receiving groove (121) and is used to contact the second busbar (400).

6. The contact structure according to claim 5, characterized in that, The contact surface of the first busbar (300) is provided with an arc-shaped groove (310), and the leaf spring (500) can place the first protrusion (211) in the arc-shaped groove (310) and generate a clamping force on the first busbar (300).

7. A circuit breaker, characterized in that, Including the contact structure as described in any one of claims 1-6, the circuit breaker further includes a first busbar (300) and a second busbar (400), wherein the edge of the second busbar (400) near the end of the first busbar (300) is provided with a chamfer (410).

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