Linkage type opening and closing mechanism of circuit breaker

Abstract

The utility model discloses a linkage type opening and closing mechanism of a circuit breaker, which comprises a first moving contact and a second moving contact, and the side surface of the first moving contact is provided with a first shaft part and a second shaft part in a protruding manner; the second moving contact and the first moving contact are arranged in parallel; the second moving contact is provided with a first shaft hole and a second shaft hole, the first shaft hole is connected with the first shaft part in an inserted mode, and the second shaft hole is connected with the second shaft part in an inserted mode. One of the first shaft part and the second shaft part is used as a rotating shaft core, and the other shaft part is used as a transmission shaft, so that the first moving contact and the second moving contact can rotate synchronously, switching-on and switching-off operation can be carried out in a linkage manner, bipolar synchronous breaking is realized, the internal mechanical structure of the circuit breaker is simplified, and the space is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field especially is linked to a kind of linkage type opening and closing mechanism of circuit breaker. BACKGROUND

[0002] Circuit breaker is widely used as an important electrical protection equipment.Circuit breaker can be used for current connection, carrying or breaking in normal circuit and abnormal circuit.Circuit breaker is widely used to promote the development of standardized circuit breaker housing size, existing circuit breaker includes single-pole, two-pole, three-pole and four-pole according to pole number, wherein the circuit breaker corresponding to each pole number is provided with corresponding number of opening and closing mechanism, for example, two groups of opening and closing mechanism are generally arranged side by side in existing two-pole circuit breaker to independently complete circuit protection of fire line and zero line.

[0003] However, existing two-pole or multi-pole circuit breaker is only simply combined with single-pole circuit breaker, so the internal structure is complex, the parts are many, the product volume is large, the weight is large, which is not conducive to the miniaturization development of product, and because the opening and closing structure of each pole works independently, the response time is difficult to keep synchronous, which affects the use effect of circuit breaker.

[0004] Therefore, the prior art still needs to be improved and developed. UTILITY MODEL CONTENT

[0005] In view of the above problems of prior art, the utility model aims to provide a linkage type opening and closing mechanism of circuit breaker, which solves the problems of complex structure, unreasonable internal space arrangement and difficult to realize synchronous breaking of existing circuit breaker.

[0006] The technical scheme of the utility model is as follows:

[0007] A linkage type opening and closing mechanism of circuit breaker, comprising a first movable contact and a second movable contact, a first shaft portion and a second shaft portion are protrudingly arranged on the side surface of the first movable contact, the second movable contact is arranged in parallel with the first movable contact, the second movable contact is provided with a first shaft hole and a second shaft hole, the first shaft hole is inserted with the first shaft portion, and the second shaft hole is inserted with the second shaft portion.

[0008] The linkage type opening and closing mechanism of the circuit breaker, wherein the circuit breaker comprises a housing and a handle rotatably arranged on the housing; the housing comprises an outer shell and a middle shell, the outer shell is hollow formed with an inner cavity, the middle shell is arranged in the inner cavity and divides the inner cavity into a first chamber and a second chamber; the middle shell is provided with a first through hole and a second through hole, the first through hole is used for assembling the first shaft part, and the second through hole is used for assembling the second shaft part; the first movable contact and the handle are arranged in the first chamber, and the second movable contact is arranged in the second chamber; the handle is connected with the first movable contact and used for driving the first movable contact and the second movable contact to rotate synchronously.

[0009] The linkage type opening and closing mechanism of the circuit breaker, wherein the first through hole is circular in shape, and the second through hole is arc-shaped.

[0010] The linkage type opening and closing mechanism of the circuit breaker, wherein the first movable contact is provided with a connecting column protruding therefrom, the connecting column is used for sleeving the handle, and the second shaft part is located between the connecting column and the first shaft part.

[0011] The linkage type opening and closing mechanism of the circuit breaker, wherein the circuit breaker comprises a first static contact and a second static contact; in the closed state, the first static contact is in contact with the first movable contact, and the second static contact is in contact with the second movable contact; in the open state, the first static contact is spaced apart from the first movable contact by a first closing distance, the second static contact is spaced apart from the second movable contact by a second closing distance, and the second closing distance is smaller than the first closing distance.

[0012] The linkage type opening and closing mechanism of the circuit breaker, wherein the first chamber is provided with an arc extinguishing structure connected with the first static contact.

[0013] The linkage type opening and closing mechanism of the circuit breaker, wherein a first fixed column is arranged on the side wall of the first chamber, and the first fixed column is located on the side of the first movable contact away from the first static contact; the first movable contact comprises a first rocker arm, a first bar-shaped body, a first rotating shaft and a first elastic member, the middle part of the first rocker arm is provided with the first shaft part; one end of the first rocker arm is provided with the second shaft part, and the other end is provided with a first hinged part; the two ends of the first bar-shaped body are respectively provided with a first connecting part and a first abutting part, and the first abutting part is used for contacting the first static contact; and the middle part of the first bar-shaped body is provided with a first assembly shaft hole; the first rotating shaft is inserted into the first assembly shaft hole; the first rotating shaft at least partially extends out of the first assembly shaft hole and is connected with the first hinged part, and is used for hingedly mounting the first bar-shaped body on the first rocker arm; one end of the first elastic member is sleeved on the first fixed column, and the other end is sleeved on the first connecting part; when the first movable contact and the first static contact contact, the first elastic member is in a stretched state.

[0014] The linkage type opening and closing mechanism of the circuit breaker, wherein the first hinged part comprises a connecting hole and a protruding limiting column, and the connecting hole is used for inserting the first rotating shaft; the first connecting part extends to one side of the limiting column; the first bar-shaped body is further provided with a first limiting part, the first limiting part extends to the other side of the limiting column, and the first limiting part is arranged symmetrically with the first connecting part.

[0015] The linkage type opening and closing mechanism of the circuit breaker, wherein a second fixed column is arranged on the shell, and the second fixed column is located on the side of the second movable contact away from the second static contact; the second movable contact comprises a second rocker arm, a second bar-shaped body, a second rotating shaft and a second elastic member, the middle part of the second rocker arm is provided with the first shaft hole; one end of the second rocker arm is provided with the second shaft hole, and the other end is provided with a second hinged part; the two ends of the second bar-shaped body are respectively provided with a second connecting part and a second abutting part, and the second abutting part is used for contacting the second static contact; and the middle part of the second bar-shaped body is provided with a second assembly shaft hole; the second rotating shaft is inserted into the second assembly shaft hole; the two ends of the second rotating shaft extend out of the second assembly shaft hole and are connected with the second hinged part, and are used for hingedly mounting the second bar-shaped body on the second rocker arm; one end of the second elastic member is sleeved on the second fixed column, and the other end is sleeved on the second connecting part; when the second movable contact and the second static contact contact, the second elastic member is in a stretched state.

[0016] The linkage type opening and closing mechanism of the circuit breaker, wherein the second hinge part comprises two connecting plates which are arranged in parallel and are each provided with a connecting shaft hole for inserting the second rotating shaft; the second strip-shaped body is inserted between the two connecting plates, and the second connecting part extends to one side of the second rocker arm; and the second strip-shaped body is further provided with a second limiting part which is symmetrically arranged with the second connecting part and extends to the other side of the second rocker arm.

[0017] Compared with the prior art, the utility model embodiment has the following advantages:

[0018] The linkage type opening and closing mechanism of the circuit breaker can realize bipolar synchronous breaking through linkage of the first movable contact and the second movable contact. Specifically, one of the first shaft part or the second shaft part serves as a rotating shaft core. For example, the first rotating shaft is fixed on the shell of the circuit breaker as the rotating shaft core. The first movable contact and the second movable contact can both rotate. When the first movable contact rotates, the second rotating shaft applies a pushing force to the side wall of the second shaft hole, so that the second movable contact rotates synchronously. In this way, the first movable contact and the second movable contact can rotate synchronously in the circuit breaker, and synchronous breaking is realized. Conversely, the second shaft part as the rotating shaft core can also achieve the same technical effect.

[0019] It can be seen that the linkage type opening and closing mechanism disclosed by the utility model can realize bipolar synchronous breaking by pushing the first movable contact or the second movable contact, and is simple to operate, reliable in transmission mode, and simple in opening and closing mechanism, which is conducive to reducing the production cost of the circuit breaker, saving the internal space of the circuit breaker, and facilitating the miniaturization development of the product. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments in the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0021] Figure 1 It is a structural schematic view of the linkage type opening and closing mechanism of the circuit breaker in the utility model;

[0022] Figure 2 It is an exploded view of the structure of the linkage type opening and closing mechanism of the circuit breaker in the utility model;

[0023] Figure 3 It is an exploded view of the structure of the circuit breaker in the utility model;

[0024] Figure 4Another angle structural explosion map of the circuit breaker in the utility model;

[0025] Figure 5 The structural schematic diagram of the middle shell in the utility model;

[0026] Figure 6 The structural schematic diagram of the partial structure of the circuit breaker in the utility model;

[0027] Figure 7 Another angle structural schematic diagram of the partial structure of the circuit breaker in the utility model.

[0028] 10, first moving contact; 11, first shaft part; 12, second shaft part; 13, connecting column; 14, first rocker arm; 141, first hinged part; 1411, connecting hole; 1412, limiting column; 15, first strip-shaped main body; 151, first connecting part; 152, first assembly shaft hole; 153, first abutting part; 154, first limiting part; 16, first rotating shaft; 17, first elastic piece; 20, second moving contact; 21, first shaft hole; 22, second shaft hole; 23, second rocker arm; 231, second hinged part; 2311, connecting plate; 2312, connecting shaft hole; 24, second strip-shaped main body; 241, second connecting part; 242, second assembly shaft hole; 243, second abutting part; 244, second limiting part; 25, second rotating shaft; 26, second elastic piece; 30, circuit breaker; 31, shell; 311, outer shell; 312, middle shell; 313, first cavity; 314, second cavity; 315, first via hole; 316, second via hole; 317, first fixing column; 318, second fixing column; 32, handle; 33, first stationary contact; 34, second stationary contact; 35, arc extinguishing structure. DETAILED DESCRIPTION

[0029] In order to enable personnel in the technical field to better understand the utility model scheme, the technical scheme in the utility model embodiments will be clearly and completely described below in conjunction with the drawings in the utility model embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the scope of protection of the utility model.

[0030] Due to manufacturing techniques and / or tolerances, variations in the shapes illustrated in the drawings can occur. Therefore, examples described herein are not limited to the specific shapes illustrated in the drawings but include variations in shapes that occur during manufacturing.

[0031] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of the listed related items.

[0032] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections described herein as being called a first element, component, region, layer or section can also be called a second element, component, region, layer or section, without departing from the teachings of the examples.

[0033] For ease of description, spatial relationship terms such as "on", "upper", "under", and "lower" can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to include, in addition to the orientation depicted in the drawings, different orientations of the device in use or operation. For example, if the device in the drawings is turned over, the element described as being "on" or "upper" relative to another element will then be "under" or "lower" relative to the other element. Therefore, the term "on" includes both "on" and "under" according to the spatial orientation of the device. The device can also be positioned in other ways, and the spatial relationship terms used herein will be interpreted accordingly.

[0034] The terms used herein are only used to describe various examples and not to limit the present disclosure. The singular form is intended to include the plural form unless the context clearly indicates otherwise. The terms "include", "contain" and "have" enumerate the presence of the stated features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0035] A circuit breaker is a device used to protect electrical systems, which can detect abnormal current in the circuit and automatically cut off the power supply to prevent equipment damage or fire. A two-pole circuit breaker is a common circuit breaker, which has a two-pole action mechanism. Two-pole means that the circuit breaker can control circuits of two polarities, i.e. live wire and neutral wire, and the two-pole circuit breaker takes into account both parts when designing, and can cut off the live wire and neutral wire at the same time when detecting abnormal current, thereby achieving complete safety protection. This circuit breaker is very thorough when breaking the power supply, enhancing the safety of the electrical system.

[0036] In the prior art, a circuit breaker is generally provided with an opening and closing mechanism to control the contact and separation of a moving contact and a stationary contact to realize the on-off of a circuit, an arc extinguishing structure to extinguish an arc, an electromagnet to realize short circuit protection, and a bimetallic strip for overload protection. A two-pole circuit breaker is generally composed of two single-pole circuit breakers, one for fire line disconnection and one for zero line disconnection. The width of a general single-pole circuit breaker is 18 mm, and the width of a two-pole circuit breaker is 36 mm. However, this simple combination makes the structure of the two-pole circuit breaker complex and the control rigid, and cannot guarantee the synchronous disconnection of the two lines.

[0037] Referring to Figure 1 In an embodiment of the utility model, a linkage type opening and closing mechanism of a circuit breaker 30 is disclosed, which comprises a first moving contact 10 and a second moving contact 20. The side surface of the first moving contact 10 is provided with a first shaft part 11 and a second shaft part 12. The second moving contact 20 is arranged in parallel with the first moving contact 10. The second moving contact 20 is provided with a first shaft hole 21 and a second shaft hole 22. The first shaft hole 21 is inserted with the first shaft part 11, and the second shaft hole 22 is inserted with the second shaft part 12.

[0038] As shown in Figure 3 and Figure 4 The circuit breaker 30 disclosed in the embodiment can be used for the circuit protection of at least fire line and zero line, and is not limited to a two-pole circuit breaker 30. The linkage type opening and closing mechanism of the circuit breaker 30 disclosed in the embodiment can realize the synchronous disconnection of two poles through the linkage of the first moving contact 10 and the second moving contact 20.

[0039] Specifically, one of the first shaft part 11 or the second shaft part 12 serves as a rotating shaft core. For example, the first shaft part 11 is fixed on the shell 31 of the circuit breaker 30 as the rotating shaft core, and the first moving contact 10 and the second moving contact 20 can both rotate. When the first moving contact 10 rotates, the second shaft part 12 exerts a pushing force on the side wall of the second shaft hole 22, so that the second moving contact 20 rotates synchronously. In this way, the first moving contact 10 and the second moving contact 20 can rotate synchronously in the circuit breaker 30, and synchronous disconnection can be realized. Conversely, the second shaft part 12 as the rotating shaft core can also achieve the same technical effect.

[0040] It can be seen that the opening and closing operation mechanism inside the circuit breaker 30 is complex, including a plurality of components such as a jump buckle, a lock buckle, and a movable support. The linkage type opening and closing mechanism disclosed in the embodiment only needs to use a set of operation mechanism to push the first moving contact 10 or the second moving contact 20, so that synchronous disconnection of two poles can be realized. The operation is simple, the transmission mode is reliable, the opening and closing mechanism is simplified, the number of components inside the circuit breaker 30 is reduced, which is conducive to reducing the production cost of the circuit breaker 30, saving the internal space of the circuit breaker 30, and facilitating the miniaturization development of the product.

[0041] Specifically, the first shaft part 11 and the second shaft part 12 are made of insulating material, such as insulating plastic, polyethylene, polyvinyl chloride, etc. Thus, the first movable contact 10 and the second movable contact 20 are synchronously rotated, but not conductive, so as to separate the live wire and the zero wire, avoiding the short circuit problem.

[0042] As shown in FIG. 1, Figure 3 and Figure 4 In another embodiment of the present application, the circuit breaker 30 comprises a housing 31 and a handle 32 rotatably arranged on the housing 31; the housing 31 comprises an outer shell 311 and a middle shell 312, the outer shell 311 is hollow to form an inner cavity, the middle shell 312 is arranged in the inner cavity and separates the inner cavity into a first chamber 313 and a second chamber 314; the first movable contact 10 and the handle 32 are arranged in the first chamber 313, and the second movable contact 20 is arranged in the second chamber 314.

[0043] The circuit breaker 30 disclosed in the embodiment separates the first movable contact 10 and the second movable contact 20 by arranging the separated first chamber 313 and the second chamber 314, so as to avoid contact short circuit and improve the use safety of the linkage type opening and closing mechanism. In addition, the middle shell 312 is arranged to facilitate the fixation of the first shaft part 11 and the second shaft part 12.

[0044] As shown in FIG. 1, Figure 5 the middle shell 312 is provided with a first through hole 315 and a second through hole 316, the first through hole 315 is used for assembling the first shaft part 11, and the second through hole 316 is used for assembling the second shaft part 12; the handle 32 is connected with the first movable contact 10 and used to drive the first movable contact 10 and the second movable contact 20 to synchronously rotate.

[0045] The housing 31 disclosed in the embodiment protects the first movable contact 10 and the second movable contact 20, and forms the closed first chamber 313 and the second chamber 314, so as to arrange the static contact, the electromagnet, the circuit board, the arc-extinguishing chamber, etc. The rationality of the space arrangement of the circuit breaker 30 is improved. Since the first movable contact 10 and the second movable contact 20 are linked in the embodiment, only one handle 32 can be arranged, which drives the first movable contact 10 and the second movable contact 20 to rotate by rotating the handle 32, so as to be convenient and simple to operate.

[0046] It should be noted that the embodiment only exemplifies the control mode that the handle 32 is connected with the first movable contact 10, in another embodiment of the present application, the handle 32 is connected with the second movable contact 20 and arranged in the second chamber 314, which can also achieve the technical effects disclosed in the present application.

[0047] Again,Figure 5 As shown, in another embodiment of this application, the first through hole 315 is circular in shape, and the second through hole 316 is arc-shaped. In this embodiment, one of the first shaft portion 11 and the second shaft portion 12 serves as a rotating shaft core and needs to be kept fixed, while the other needs to rotate.

[0048] Therefore, in this embodiment, the first through hole 315 is circular. Preferably, the shape of the first shaft portion 11 is adapted to the shape of the first through hole 315, so that when the first shaft portion 11 is inserted into the first through hole 315, it can only rotate around its own center line without shifting or sliding laterally, thereby stably supporting the first moving contact 10 and the second moving contact 20. Based on this, the shape of the second through hole 316 is set to arc, so that when the first moving contact 10 rotates, the second shaft portion 12 can move flexibly in the second through hole 316.

[0049] In actual operation, the width of the second through hole 316 can be set to be slightly larger than the width of the second shaft portion 12. This allows the second through hole 316 to be made into a long strip extending in a straight direction during manufacturing, without affecting the movement of the second through hole 316. When the width of the second through hole 316 is equal to the width of the second shaft portion 12, the limiting effect of the second through hole 316 on the second shaft portion 12 is better. However, the shape of the second through hole 316 needs to be set to be arc-shaped, and its extension direction overlaps with the movement trajectory of the second shaft portion 12.

[0050] Conversely, in this embodiment, the first through hole 315 can be set to be arc-shaped and the second through hole 316 to be circular, thereby keeping the second shaft 12 as the rotating shaft core and allowing the first shaft 11 to rotate, which can also achieve the technical effect disclosed in this application.

[0051] like Figure 2 , Figure 3 and Figure 6 As shown, in another embodiment of this application, a connecting post 13 is protruding from the first moving contact 10, the connecting post 13 being used to sleeve the handle 32; the second shaft portion 12 is located between the connecting post 13 and the first shaft portion 11.

[0052] In this embodiment, when the handle 32 is rotated, it directly contacts the connecting post 13 and exerts a force on the connecting post 13. Preferably, the connecting post 13 is located at the end of the first moving contact 10 to increase the lever arm length, thereby achieving the purpose of saving effort and facilitating the pushing of the handle 32 to complete the disconnection operation.

[0053] Specifically, in addition to its own rotational resistance, the first moving contact 10 also experiences rotational resistance from the second moving contact 20. When the first shaft 11 is the rotating shaft core, the resistance of the second moving contact 20 is transmitted to the first moving contact 10 through the second shaft 12. Therefore, in this embodiment, the connecting post 13 is positioned further away from the first shaft 11, resulting in a longer power arm; the second shaft 12 is positioned closer to the first shaft 11, resulting in a shorter resistance arm. From a mechanical perspective, this creates a force-saving lever, thereby reducing rotational resistance and making it easier to achieve the goal of simultaneously rotating the first moving contact 10 and the second moving contact 20 with the handle 32.

[0054] For example Figure 2 As shown, in another embodiment of this invention, the connecting post 13 is disposed on the side of the first moving contact 10 away from the second moving contact 20. The connecting post 13, the first shaft portion 11, and the second shaft portion 12 are respectively disposed on both sides of the first moving contact 10, which is reasonably distributed to facilitate connection and assembly and avoid interference between the assembly operation of the handle 32 and the assembly operation of the second moving contact 20.

[0055] Specifically, in this embodiment, the connecting post 13, the first shaft portion 11, and the second shaft portion 12 are all integrally formed with the first moving contact 10, which helps to increase the stability of the structure, facilitates manufacturing, and saves assembly steps.

[0056] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, in another embodiment of this application, the circuit breaker 30 includes a first stationary contact 33 and a second stationary contact 34; in the closed state, the first stationary contact 33 and the first moving contact 10 are in contact; the second stationary contact 34 and the second moving contact 20 are in contact; in the open state, the distance between the first stationary contact 33 and the first moving contact 10 is a first closing distance; the distance between the second stationary contact 34 and the second moving contact 20 is a second closing distance; the second closing distance is less than the first closing distance.

[0057] The linkage opening and closing mechanism disclosed in this embodiment is equipped with a first moving contact 10 and a second moving contact 20 that are linked together, and adapted to a first stationary contact 33 and a second stationary contact 34, so as to protect the neutral wire and the live wire at the same time and improve the safety of the circuit breaker 30.

[0058] Specifically, because the moving contact and the static contact will generate an arc at the moment of separation, the circuit breaker 30 is generally provided with an arc extinguishing structure 35 to quickly extinguish the arc and suppress the current, avoiding accidents and incidents. In the embodiment, the second closing distance is set to be smaller than the first closing distance, so that when closing, the second moving contact 20 and the second static contact 34 are in contact first, and the first moving contact 10 and the first static contact 33 are in contact later; when opening, the first moving contact 10 and the first static contact 33 are separated first, and the second moving contact 20 and the second static contact 34 are separated later, so that only one side generates an arc at the moment of power-off, that is, an arc is generated in the first chamber 313.

[0059] For example, in the embodiment, the first moving contact 10 and the first static contact 33 are connected to the live line, the second moving contact 20 and the second static contact 34 are connected to the zero line, and the first closing distance is 5.5 mm and the second closing distance is 5.3 mm. In this case, when the circuit breaker 30 is closed, the zero line is connected first, and then the live line is connected; when opening, the first moving contact 10 and the first static contact 33 are separated first, and an arc is generated in the first chamber 313 when the live line is disconnected; after the circuit is disconnected, the second moving contact 20 and the second static contact 34 are separated, and at this time, the zero line is disconnected and no arc is generated.

[0060] As can be seen, in the embodiment, the arc extinguishing structure 35 does not need to be arranged in the second chamber 314, thereby saving the space in the circuit breaker 30 and facilitating the reduction of the volume of the circuit breaker 30, so as to facilitate the arrangement of the circuit board, the intelligent control board, the current detection module and other structures, and to achieve the effect of optimizing the structure of the circuit breaker 30.

[0061] Specifically, in the embodiment, the first static contact 33 and the second static contact 34 are both in the form of a conductive sheet, and preferably, a sheet material with the same thickness, the same material and the same shape is used as the main body to simplify the structure of the parts. In order to make the closing distance of the second static contact 34 and the second moving contact 20 closer, a protrusion can be welded and fixed at the contact position of the second static contact 34, and the thickness of the protrusion is about 1-2 mm, so that the circuit is connected through the contact of the protrusion and the second moving contact 20. In addition, in another embodiment of the embodiment, the protrusion can be integrally formed with the second static contact 34, so as to save the welding step and facilitate manufacturing.

[0062] As shown in FIGS. 1, 2 and 3, in the embodiment, the first chamber 313 is arranged between the first moving contact 10 and the first static contact 33, and the second chamber 314 is arranged between the second moving contact 20 and the second static contact 34. Figure 3 Figure 6 As shown in FIGS. 1, 2 and 3, in the embodiment, the first chamber 313 is arranged between the first moving contact 10 and the first static contact 33, and the second chamber 314 is arranged between the second moving contact 20 and the second static contact 34.

[0063] ​It should be noted that in actual production, if the space in the circuit breaker 30 is large enough, the second chamber 314 in the embodiment disclosed herein can also be provided with an arc extinguishing structure 35 connected to the second static contact 34. By setting the arc extinguishing structure 35 as a defense device, the arc in the second chamber 314 can be quickly extinguished when an arc is accidentally generated, further improving the safety of the use of the circuit breaker 30.

[0064] As shown in Figure 2 , Figure 3 and Figure 6 , in another embodiment of the present application, the first moving contact 10 is disclosed to include a first rocker arm 14, a first bar-shaped body 15, a first rotating shaft 16 and a first elastic member 17. The middle part of the first rocker arm 14 is provided with the first shaft part 11, which can be integrally formed with the first rocker arm 14 in actual production, and is processed by injection molding of insulating plastic, which has high production efficiency and stable structure.

[0065] As shown in Figure 2 , one end of the first rocker arm 14 is provided with the second shaft part 12, and the other end is provided with a first hinged part 141. The second shaft part 12 is connected to the second moving contact 20, and the first hinged part 141 is used to hinge the first bar-shaped body 15 through the first rotating shaft 16. When the first rocker arm 14 rotates, the second shaft part 12 pushes the second moving contact 20 to rotate around the first shaft part 11, and at the same time, the first bar-shaped body 15 swings synchronously with the rotation of the first hinged part 141.

[0066] In the embodiment, the two ends of the first bar-shaped body 15 are respectively provided with a first connecting part 151 and a first abutting part 153, and the first abutting part 153 is used to contact the first static contact 33. That is, when the first rocker arm 14 swings, it drives the first bar-shaped body 15 to perform opening and closing operation, and at the same time, it drives the second moving contact 20 to perform opening and closing operation, realizing linkage of two-stage opening and closing mechanism and improving the synchronism of opening and closing.

[0067] Specifically, in actual use of the circuit breaker 30, the closer the contact between the moving contact and the static contact, the safer the circuit. If the moving contact and the static contact only contact each other without abutting each other, the problem of poor contact is prone to occur. On this basis, in the embodiment, the first rocker arm 14 drives the first bar-shaped body 15 to move to realize abutment with the first static contact 33, and the rotating distance of the first rocker arm 14 can be set to be greater than the first closing distance. For example, the swinging distance of the first rocker arm 14 when closing is 5.6 mm, and the first closing distance is 5.5 mm, so that appropriate pressure is applied to the first bar-shaped body 15 to press the first bar-shaped body 15 on the first static contact 33. The first bar-shaped body 15 is made of metal material and has a certain toughness, and it is acceptable to produce slight deformation within a certain range and withstand appropriate pressure without breaking.

[0068] Specifically, in order to improve the safety of the first bar-shaped body 15, the first bar-shaped body 15 is designed separately from the first rocker arm 14, and the first bar-shaped body 15 is hingedly connected to the first rocker arm 14. A first assembly shaft hole 152 is arranged in the middle of the first bar-shaped body 15. The first rotating shaft 16 is inserted into the first assembly shaft hole 152. The first rotating shaft 16 at least partially extends out of the first assembly shaft hole 152 and is connected to the first hinged part 141, so as to hingedly mount the first bar-shaped body 15 on the first rocker arm 14. In the embodiment, the first bar-shaped body 15 and the first rocker arm 14 are connected by the first rotating shaft 16, so that the first bar-shaped body 15 can be flexibly rotated.

[0069] As shown in Figure 6 The first fixed column 317 is arranged on the side wall of the first cavity 313 and located on the side of the first movable contact 10 away from the first fixed contact 33. One end of the first elastic member 17 is sleeved on the first fixed column 317, and the other end is sleeved on the first connecting part 151. When the first movable contact 10 and the first fixed contact 33 are in contact, the first elastic member 17 is in a stretched state.

[0070] The first elastic member 17 disclosed in the embodiment includes but is not limited to a spring and has stretchability. When the first rocker arm 14 rotates and drives the first bar-shaped body 15 to move like the first fixed contact 33, the first elastic member 17 is stretched, thus generating a certain tension. The tension makes the first bar-shaped body 15 have a tendency to rotate, and the direction of rotation is towards the first fixed contact 33. Therefore, the first elastic member 17 can be arranged to make the first bar-shaped body 15 quickly contact the first fixed contact 33, improve the working efficiency of the opening and closing mechanism, and shorten the response time of the circuit breaker 30.

[0071] In addition, when the first bar-shaped body 15 contacts the first fixed contact 33, the first abutting part 153 cannot continue to rotate and remains stationary, but the rotating stroke of the first rocker arm 14 is longer than the first closing distance. When the first rocker arm 14 continues to rotate, the first bar-shaped body 15 will rotate around the first abutting part 153 as the axis. At this time, the tension generated at the first assembly shaft hole 152 is opposite to the direction of the tension at the position of the first connecting part 151, and part of the tension cancels each other out, which can reduce the bending deformation of the first bar-shaped body 15, thereby protecting the first bar-shaped body 15 and reducing the risk of cracks or breakage.

[0072] In summary, in this embodiment, the first moving contact 10 is provided in a split type, the first rocker arm 14 is used as a support to connect the first strip-shaped body 15 and drive the first strip-shaped body 15 to open and close, the first elastic member 17 is used to pull the first strip-shaped body 15 in the opposite direction, so that the first strip-shaped body 15 is quickly closed, the abutting force is increased, the contact stability is improved, the local force on the first strip-shaped body 15 is reduced, and deformation or fracture is avoided. Finally, the first moving contact 10 and the first stationary contact 33 are in close contact, and the circuit is stable in the closed state.

[0073] For example Figure 2 As shown in the drawings, in another embodiment of the present application, it is disclosed that the first hinge part 141 comprises a connecting hole 1411 and a protruding limiting column 1412, the connecting hole 1411 is used for inserting the first rotating shaft 16; the first connecting part 151 extends to one side of the limiting column 1412; the first strip-shaped body 15 is further provided with a first limiting part 154, the first limiting part 154 extends to the other side of the limiting column 1412, and the first connecting part 151 is symmetrically arranged. In this embodiment, the first connecting part 151 and the first limiting part 154 extend to both sides of the limiting column 1412 to limit the rotating stroke of the first strip-shaped body 15.

[0074] Since the first strip-shaped body 15 is pulled by the first elastic member 17, it is easy to overturn, for example, the first strip-shaped body 15 is initially in a vertical state, if it is pulled into a horizontal state, it will affect the contact with the first stationary contact 33, and it is easy to cause the closing failure. Therefore, in this embodiment, when the first strip-shaped body 15 is driven by the first rocker arm 14, the first elastic member 17 is stretched, and a pulling force is applied to the first strip-shaped body 15, so that the first strip-shaped body 15 rotates, the first abutting part 153 rotates forward, and the first connecting part 151 rotates backward, so that the first limiting part 154 contacts and abuts on the limiting column 1412. At this time, the first strip-shaped body 15 remains stable and will not continue to overturn, but will remain in a fixed posture, and finally contacts with the first stationary contact 33. It can be seen that the first limiting part 154 can avoid the first strip-shaped body 15 from rotating too much, and prevent the first strip-shaped body 15 from being pulled by the first elastic member 17 to affect the circuit conduction effect.

[0075] For example Figure 2 , Figure 4 and Figure 7As shown in another embodiment of the present application, the second fixed column 318 is arranged on the shell 31 and located on the side of the second movable contact 20 away from the second stationary contact 34. The second movable contact 20 comprises a second rocker arm 23, a second strip-shaped body 24, a second rotating shaft 25 and a second elastic member 26. The middle part of the second rocker arm 23 is provided with the first shaft hole 21. One end of the second rocker arm 23 is provided with the second shaft hole 22, and the other end is provided with a second hinged part 231. The two ends of the second strip-shaped body 24 are respectively provided with a second connecting part 241 and a second abutting part 243. The second abutting part 243 is used for contacting the second stationary contact 34. The middle part of the second strip-shaped body 24 is provided with a second assembly shaft hole 242. The second rotating shaft 25 is inserted into the second assembly shaft hole 242. The two ends of the second rotating shaft 25 protrude out of the second assembly shaft hole 242 and are connected with the second hinged part 231, which is used for hingedly mounting the second strip-shaped body 24 on the second rocker arm 23. One end of the second elastic member 26 is sleeved on the second fixed column 318, and the other end is sleeved on the second connecting part 241. When the second movable contact 20 and the second stationary contact 34 are in contact, the second elastic member 26 is in a stretched state.

[0076] The second movable contact 20 disclosed in the embodiment can be arranged in a split type. The second movable contact 20 is flexibly rotatable by cooperating the second rocker arm 23 and the second strip-shaped body 24 and being constrained by the second elastic member 26. The second movable contact 20 can bear greater tension and maintain good contact with the second stationary contact 34.

[0077] It should be further explained that, since the second closing distance is smaller than the first closing distance, the second movable contact 20 needs to be arranged in a split type to avoid the second rocker arm 23 from excessively rotating and causing the second strip-shaped body 24 to crack or break. The second elastic member 26 can reduce the deformation of the second strip-shaped body 24, prolong the service life of the linkage type opening and closing structure, and reduce maintenance costs.

[0078] For example Figure 2 As shown in another embodiment of the present application, the second hinged part 231 comprises two connecting plates 2311. The two connecting plates 2311 are arranged in parallel and are both provided with a connecting shaft hole 2312 for inserting the second rotating shaft 25. The second strip-shaped body 24 is inserted between the two connecting plates 2311. The second connecting part 241 extends to one side of the second rocker arm 23. The second strip-shaped body 24 is further provided with a second limiting part 244 which is symmetrically arranged with the second connecting part 241 and extends to the other side of the second rocker arm 23.

[0079] The second hinge part 231 disclosed in the embodiment is connected with the second rotating shaft 25, so that the second strip-shaped body 24 can rotate flexibly, and the second limiting part 244 is arranged, which is similar to the first limiting part 154 on the first strip-shaped body 15, and plays a role of restricting the rotating stroke and controlling the posture of the second strip-shaped body 24, so that the success rate of the contact between the second strip-shaped body 24 and the second static contact 34 can be increased.

[0080] In conclusion, the application discloses a linkage type opening and closing mechanism of a circuit breaker 30, which comprises a first moving contact 10 and a second moving contact 20, the side of the first moving contact 10 is provided with a first shaft part 11 and a second shaft part 12, the second moving contact 20 is arranged in parallel with the first moving contact 10, the second moving contact 20 is provided with a first shaft hole 21 and a second shaft hole 22, the first shaft hole 21 is inserted with the first shaft part 11, and the second shaft hole 22 is inserted with the second shaft part 12.

[0081] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0082] It should be noted that the application takes the linkage type opening and closing mechanism of the circuit breaker as an example to introduce the specific structure and working principle of the application, but the application is not limited to the linkage type opening and closing mechanism of the circuit breaker, and can also be applied to the production and use of other similar workpieces.

[0083] It should be understood that the application is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof.

[0084] The above description is only the preferred embodiment of the application, and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application should be included in the protection scope of the application. The above description is only the preferred embodiment of the application, and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A linkage type opening and closing mechanism of a circuit breaker, characterized by comprising: The circuit breaker comprises: a first movable contact, a side of the first movable contact is provided with a first shaft portion and a second shaft portion; a second movable contact, which is arranged in parallel with the first movable contact; the second movable contact is provided with a first shaft hole and a second shaft hole, the first shaft hole is inserted with the first shaft portion, and the second shaft hole is inserted with the second shaft portion.

2. The linkage type opening and closing mechanism of a circuit breaker according to claim 1, characterized by, The circuit breaker comprises a housing and a handle rotatably arranged on the housing; the housing comprises an outer shell and a middle shell, the outer shell is hollowly formed with an inner cavity, the middle shell is arranged in the inner cavity and divides the inner cavity into a first chamber and a second chamber; and the middle shell is provided with a first through hole and a second through hole, the first through hole is used for assembling the first shaft portion, and the second through hole is used for assembling the second shaft portion; wherein the first movable contact and the handle are arranged in the first chamber, and the second movable contact is arranged in the second chamber; the handle is connected with the first movable contact and used for driving the first movable contact and the second movable contact to rotate synchronously.

3. The linkage type opening and closing mechanism of a circuit breaker according to claim 2, wherein The shape of the first through hole is circular, and the shape of the second through hole is arc-shaped.

4. The linkage-type opening and closing mechanism of a circuit breaker according to claim 3, characterized by The first movable contact is provided with a connecting column protruding therefrom, and the connecting column is used for sleeving the handle; wherein the second shaft portion is located between the connecting column and the first shaft portion.

5. The linkage-type opening and closing mechanism of a circuit breaker according to claim 2, wherein The circuit breaker comprises a first stationary contact and a second stationary contact; in a closed state, the first stationary contact and the first movable contact are in contact, and the second stationary contact and the second movable contact are in contact; in an open state, the distance between the first stationary contact and the first movable contact is a first closed distance, and the distance between the second stationary contact and the second movable contact is a second closed distance; wherein the second closed distance is smaller than the first closed distance.

6. The linkage-type opening and closing mechanism of a circuit breaker according to claim 5, wherein An arc extinguishing structure is arranged in the first chamber, and the arc extinguishing structure is connected with the first stationary contact.

7. The interlocked opening and closing mechanism of a circuit breaker according to claim 5, wherein A first fixed column is arranged on the side wall of the first chamber, and the first fixed column is located on the side of the first movable contact away from the first stationary contact; the first movable contact comprises: a first rocker arm, a middle portion of the first rocker arm is provided with the first shaft portion; one end of the first rocker arm is provided with the second shaft portion, and the other end is provided with a first hinged portion; a first strip-shaped main body, two ends of the first strip-shaped main body are respectively provided with a first connecting portion and a first abutting portion, and the first abutting portion is used for contacting the first stationary contact; and a middle portion of the first strip-shaped main body is provided with a first assembly shaft hole; a first rotating shaft, which is inserted with the first assembly shaft hole; the first rotating shaft at least partially extends out of the first assembly shaft hole and is connected with the first hinged portion, and is used for hingedly mounting the first strip-shaped main body on the first rocker arm; a first elastic member, one end of which is sleeved on the first fixed column, and the other end is sleeved on the first connecting portion; wherein when the first movable contact and the first stationary contact are in contact, the first elastic member is in a stretched state.

8. The linkage-type opening and closing mechanism of a circuit breaker according to claim 7, wherein The first connecting part extends to one side of the limiting column, and the first strip-shaped body is further provided with a first limiting part which extends to the other side of the limiting column and is symmetrically arranged with the first connecting part.

9. The interlocked opening and closing mechanism of a circuit breaker according to claim 5, wherein The shell is provided with a second fixing column which is located at the side of the second movable contact away from the second stationary contact. The second connecting part and the second abutting part are respectively arranged at two ends of the second strip-shaped body, the second abutting part is used for contacting the second stationary contact, and the middle part of the second strip-shaped body is provided with a second assembly shaft hole. A second rotating shaft is inserted into the second assembly shaft hole, and two ends of the second rotating shaft extend out of the second assembly shaft hole and are connected with the second connecting part, so as to hingedly install the second strip-shaped body on the second rocker arm. A second elastic member is sleeved on the second fixing column at one end and is sleeved on the second connecting part at the other end. When the second movable contact and the second stationary contact are in contact, the second elastic member is in a stretched state. The second connecting part extends to one side of the second rocker arm, and the second strip-shaped body is further provided with a second limiting part which is symmetrically arranged with the second connecting part and extends to the other side of the second rocker arm.

10. The linkage-type opening and closing mechanism of a circuit breaker according to claim 9, wherein ​ ​

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