Circuit breaker

Abstract

The invention relates to the technical field of low-voltage circuit breakers, in particular to a circuit breaker. The circuit breaker provided by the invention comprises a circuit board, a moving contact and a static contact, and the static contact is electrically connected with the circuit board; in the closing process, the moving contact is electrically connected with the circuit board and the static contact in sequence; in the opening and releasing process, the moving contact is electrically disconnected with the static contact and the circuit board in sequence. When the moving contact and the static contact are disconnected and short-circuited, the circuit board plays a role in arc extinguishing, and the arc extinguishing effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage circuit breakers, and in particular to a circuit breaker. Background Art

[0002] Existing low-voltage circuit breaker products, when used in DC and AC systems, often require an amplified arc extinguishing system to meet product performance requirements. As product performance requirements are getting higher and higher, traditional products can no longer meet higher performance requirements.

[0003] Currently, more and more low-voltage electrical appliance manufacturers are researching solid-state circuit breakers, and some pure solid-state circuit breaker products have appeared. However, due to the high cost, they are not widely used. Mainly because of the big problem of heat dissipation, cooling devices are also needed, so only some small current products (below 80A) can be put into formal application.

[0004] It can be seen that in the field of low-voltage circuit breakers, there is an urgent need for a circuit breaker that can meet high performance requirements while being low in cost. Summary of the invention

[0005] The object of the present invention is to provide a circuit breaker to solve the technical problems that the existing low-voltage circuit breakers cannot meet the high performance requirements and the pure solid-state circuit breakers have high costs.

[0006] A circuit breaker provided by the present invention comprises a circuit board, a moving contact and a stationary contact, wherein the stationary contact is electrically connected to the circuit board;

[0007] During the closing process, the moving contact is electrically connected to the circuit board and the static contact in sequence;

[0008] During the opening and tripping process, the moving contact is electrically disconnected from the stationary contact and the circuit board in sequence.

[0009] As a further technical solution, it also includes a conductive structure, a first conductive wire and a second conductive wire, wherein the conductive structure is electrically connected to the circuit board through the first conductive wire, and the static contact is electrically connected to the circuit board through the second conductive wire;

[0010] The conductive structure is located on the moving path of the moving contact, and during the closing process, the moving contact is connected to the conductive structure and the static contact in sequence, and during the opening and tripping process, the moving contact is separated from the static contact and the conductive structure in sequence.

[0011] As a further technical solution, the conductive structure includes a first connecting rib and an elastic clamping structure arranged on the first connecting rib;

[0012] The elastic clamping structure forms a clamping space for clamping the moving contact, and the moving contact can move in and out of the clamping space.

[0013] As a further technical solution, the elastic clamping structure includes a first arm and a second arm, the first arm and the second arm are arranged opposite to each other, and the clamping space is formed therebetween;

[0014] The first arm has clamping elasticity, and / or the second arm has clamping elasticity.

[0015] As a further technical solution, the first arm includes a first arm body and a second connecting rib;

[0016] The second connecting rib has two opposite ends, one end of which is connected to the first connecting rib, and the other end of which is connected to the first arm body;

[0017] The first arm body and the second connecting rib are bent relative to each other, and the first arm body is located on a side of the second connecting rib facing the second arm.

[0018] As a further technical solution, the second arm includes a second arm body and a third connecting rib;

[0019] The third connecting rib has two opposite ends, one end of which is connected to the first connecting rib, and the other end of which is connected to the second arm body;

[0020] The second arm body is bent relative to the third connecting rib, and the second arm body is located on a side of the third connecting rib facing the first arm.

[0021] As a further technical solution, the conductive structure is located on the inner side of the moving contact.

[0022] As a further technical solution, the moving contact is arc-shaped, and the conductive member is located on the inner arc side of the moving contact.

[0023] As a further technical solution, the conductive structure is in sheet form and is integrally formed.

[0024] As a further technical solution, the resistance of the conductive structure is greater than the resistance of the moving contact.

[0025] As a further technical solution, when the circuit breaker is an AC circuit breaker, it has at least one pole with the same phase, or, when the circuit breaker is a DC circuit breaker, it has at least one pole with the same polarity;

[0026] The circuit board is located at one side of a pole.

[0027] As a further technical solution, when the circuit breaker is an AC circuit breaker, it has at least two poles with different phases, or, when the circuit breaker is a DC circuit breaker, it has at least two poles with different polarities;

[0028] The circuit board includes two mutually isolated first circuit boards and second circuit boards, and when an arc is generated during the process of the circuit breaker being turned on or off, the moving contact is electrically connected to the circuit board, and the arc voltage supplies power to the circuit board to make the circuit board conductive with the moving contact and the static contact, and at this time, the current path is the power supply end of one pole-the first circuit board-the load end of one pole-the load end of the other pole-the second circuit board-the power supply end of the other pole.

[0029] As a further technical solution, the first circuit board is located on the upper side and the second circuit board is located on the lower side, and the current path is the static contact of one pole-the first circuit board-the moving contact of one pole-the moving contact of the other pole-the second circuit board-the static contact of the other pole.

[0030] Compared with the prior art, the circuit breaker provided by the present invention has the following technical advantages:

[0031] The circuit breaker provided by the present invention comprises a circuit board, a moving contact and a stationary contact, wherein the stationary contact is electrically connected to the circuit board; during the closing process, the moving contact is electrically connected to the circuit board and the stationary contact in sequence; during the opening and tripping process, the moving contact is electrically disconnected from the stationary contact and the circuit board in sequence.

[0032] When the moving contact and the static contact are disconnected and short-circuited, the circuit board plays the role of extinguishing the arc, improving the arc extinguishing effect. In order to ensure that the circuit board achieves the arc extinguishing effect, during the closing process, the moving contact moves, and during the movement of the moving contact, it first realizes electrical connection with the circuit board, and then realizes electrical connection with the static contact. Since the static contact and the circuit board always maintain electrical connection, when the moving contact and the circuit board are electrically connected, the moving contact and the static contact are both connected to the circuit board; during the opening process, the moving contact moves, and during the movement of the moving contact, it first disconnects the electrical connection with the static contact, and then disconnects the electrical connection with the circuit board; when an overload or short circuit fault occurs, the closing position changes to the opening position, and the moving contact moves, and during the movement of the moving contact, it first disconnects the electrical connection with the static contact, and then disconnects the electrical connection with the circuit board.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0036] Figure 2 An exploded view of the overall structure provided by an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the connection between the moving contact, the stationary contact and the conductive structure provided in an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of a moving contact provided by an embodiment of the present invention when the moving contact is not electrically connected to the conductive structure and the stationary contact;

[0039] Figure 5 A schematic diagram of a moving contact provided by an embodiment of the present invention being electrically connected to a conductive structure and not electrically connected to a stationary contact;

[0040] Figure 6 A schematic diagram of a moving contact provided by an embodiment of the present invention being electrically connected to a conductive structure and a stationary contact;

[0041] Figure 7 A schematic diagram of a conductive structure provided by an embodiment of the present invention;

[0042] Figure 8 A schematic diagram of the connection between a circuit board and a contact system provided in an embodiment of the present invention;

[0043] Fig. 9 A schematic diagram of the position of a circuit board when three cavities are provided in an embodiment of the present invention;

[0044] Fig.10 A schematic diagram of the position of a circuit board when four cavities are provided in the embodiment of the present invention;

[0045] Fig.11 Another schematic diagram of the position of the circuit board when there are four cavities provided in the embodiment of the present invention;

[0046] Fig.12 A schematic diagram of the position of a circuit board when five cavities are provided in an embodiment of the present invention;

[0047] Fig.13 A schematic diagram of the position of an AC circuit breaker circuit board when five cavities are provided in an embodiment of the present invention.

[0048] Icons: 1-cover; 2-base; 3-cavity; 4-circuit board; 41-first circuit board; 42-second circuit board; 5-tripper; 6-operating mechanism; 7-lever; 8-rotating shaft; 9-moving contact; 10-static contact; 11-conductive structure; 12-first conductive wire; 13-second conductive wire; 14-first connecting rib; 15-clamping space; 16-first arm; 17-second arm; 18-first arm body; 19-second connecting rib; 20-second arm body; 21-third connecting rib; 22-contact arc extinguishing system; 23-arc extinguishing chamber. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0054] Specific structure such as Figures 1 to 13 shown.

[0055] The present embodiment provides a circuit breaker, comprising: a cover body 1, a base body 2, a circuit board 4, and a contact system and an arc extinguishing system that cooperate with each other; the cover body 1 is covered on the base body 2, and at least three cavities 3 are arranged side by side on the base body 2; a circuit board 4 is arranged in a cavity 3 located between the cavities 3 on both sides, and the contact system and the arc extinguishing system are arranged in the remaining cavities 3 to form each pole of the circuit breaker; the circuit board 4 is used to absorb the arc energy generated during short circuit breaking.

[0056] In this embodiment, a circuit board 4 is arranged in a traditional molded case circuit breaker to form a circuit breaker. The circuit board 4 and the arc extinguishing chamber 23 of the arc extinguishing system absorb the energy generated during short-circuit breaking, thereby reducing the heat generated during short-circuit breaking. Therefore, there is no need to set a cooling device like in a traditional pure solid-state circuit breaker, thereby improving the performance of the circuit breaker. Therefore, the performance problem is solved, and the manufacturing cost is not as high as that of a pure solid-state circuit breaker. At the same time, the circuit board 4 is located in a cavity 3 between the cavities 3 on both sides, thereby avoiding the contact systems in the cavities 3 on both sides of the circuit board 4 from being too close to each other, thereby reducing the risk of short circuit, and realizing the combination of the circuit board 4 and the traditional molded case circuit breaker without significantly increasing the volume of the circuit breaker, thereby making more reasonable use of space and improving space utilization.

[0057] The optional technical solution of this embodiment further includes an operating mechanism 6 , which is located in the cavity 3 where the circuit board 4 is disposed and on the side of the circuit board 4 facing the cover 1 , and a lever 7 of the operating mechanism 6 extends out of the cover 1 .

[0058] In this embodiment, the operating mechanism 6 is located on the side of the circuit board 4 facing the cover body 1 and is directly opposite to the circuit board 4, and the operating mechanism 6 and the circuit board 4 are located in the same cavity 3, making full use of the space and reducing the overall volume of the circuit breaker. At the same time, the lever 7 of the operating mechanism 6 extends out of the cover body 1, making it convenient for the user to push the lever 7 to close and open the circuit breaker.

[0059] In an optional technical solution of this embodiment, the tripper 5 is located in a cavity 3 provided with a contact system, and is used to enable the operating mechanism 6 to perform a tripping action.

[0060] In this embodiment, when the circuit breaker has more than or equal to two poles, all contact systems can form one pole by connecting the poles in series or in parallel or in series and in parallel, that is, a single-pole circuit breaker, which is one phase of an AC circuit breaker or one pole of a DC circuit breaker. It is also possible that all the contact systems on one side of the circuit board form one pole with the same phase or polarity, and all the contact systems on the other side of the circuit board form one pole with the same phase or polarity, that is, a two-pole circuit breaker, which is two phases of an AC circuit breaker or two poles of a DC circuit breaker. Each pole has at least one release 5, or each contact system is equipped with a release 5. Preferably, the contact system and the arc extinguishing system are integrated to form a contact arc extinguishing system 22. A release 5 is provided at the end of each contact arc extinguishing system 22, and the release 5 is also located in the cavity 3 where the contact arc extinguishing cavity system is located. When the product fails such as overload, the release 5 can open the moving contact 9 and the static contact 10 in the contact arc extinguishing system 22 to protect the circuit.

[0061] The optional technical solution of this embodiment also includes a rotating shaft 8, which passes through the entire cavity 3 and is connected to the operating mechanism 6 in transmission; the operating mechanism 6 is used to drive the rotating shaft 8 to rotate, and the rotating shaft 8 drives the contact 9 system to perform closing action, opening action or tripping action through rotation.

[0062] In this embodiment, a rotating shaft 8 is provided in each cavity 3, and all the rotating shafts 8 can rotate synchronously and coaxially. The rotating shaft 8 is transmission-connected with the operating mechanism 6, and the operating mechanism 6 drives the rotating shaft 8 to rotate, so that the contact arc extinguishing system 22 performs closing action, opening action and tripping action. When a product fails such as overload, the release 5 drives the operating mechanism 6 to perform a tripping action, and the tripping action causes the moving contact 9 and the static contact 10 in the contact arc extinguishing system 22 to open to protect the circuit.

[0063] In the optional technical solution of this embodiment, the circuit board 4 is a solid-state circuit board 4, that is, a PCB board, which is sturdy and durable, small in size, and light in weight. It can effectively reduce space occupancy and is easy to assemble, install, replace and repair. At the same time, the circuit connection is firm and reliable, and has strong durability. It can withstand complex environments such as high temperature and high humidity, and the PCB board can be easily mass-produced at low cost.

[0064] In an optional technical solution of this embodiment, an odd number of cavities 3 are provided, and a circuit board 4 is provided in the middle cavity 3 .

[0065] Specifically, when there are three or five cavities 3, the circuit board 4 is arranged in the middle cavity 3, so that the other cavities 3 on both sides of the circuit board 4 are symmetrical with respect to the cavity 3 where the circuit board 4 is located, that is, the number of cavities 3 on both sides of the cavity 3 where the circuit board 4 is located is equal, thereby reducing the possibility of short circuit, and the operating mechanism 6 is located in the middle position, and the structure is beautiful.

[0066] It should be noted that the present embodiment is not limited thereto, and the number of the cavities 3 may be any odd number greater than or equal to three.

[0067] In an optional technical solution of this embodiment, an even number of cavities 3 are provided, and a circuit board 4 is provided in any one of the two cavities 3 located in the middle.

[0068] Specifically, when four cavities 3 are provided, the circuit board 4 is provided in any one of the two cavities 3 in the middle, so that there are two cavities 3 on one side of the cavity 3 where the circuit board 4 is located and one cavity 3 on the other side. The structure is beautiful and the arrangement is reasonable, which improves space utilization.

[0069] It should be noted that the present embodiment is not limited thereto, and the number of the cavities 3 may be any even number greater than or equal to four.

[0070] In the optional technical solution of this embodiment, the contact system has a moving contact 9 and a stationary contact 10, and the stationary contact 10 is electrically connected to the circuit board 4; during the closing process, the moving contact 9 is electrically connected to the circuit board 4 and the stationary contact 10 in turn; during the opening and tripping process, the moving contact 9 is electrically disconnected from the stationary contact 10 and the circuit board 4 in turn.

[0071] In this embodiment, when the moving contact 9 and the stationary contact 10 are short-circuited, an arc will be generated when the moving contact 9 and the stationary contact 10 are opened, part of the arc is extinguished by the arc extinguishing system, and the other part of the arc enters the circuit board 4, and the circuit board 4 also plays a part in extinguishing the arc, thereby improving the arc extinguishing effect.

[0072] In order to ensure that the circuit board 4 achieves arc extinguishing effect, in the process of pushing the lever 7 to close the operating mechanism 6, the operating mechanism 6 drives the rotating shaft 8 to rotate, and then drives the moving contact 9 set on the rotating shaft 8 to move. In the process of the moving contact 9 moving, it first realizes electrical connection with the circuit board 4, and then realizes electrical connection with the static contact 10. Since the static contact 10 and the circuit board 4 always maintain electrical connection, when the moving contact 9 realizes electrical connection with the circuit board 4, the moving contact 9 and the static contact 10 are both connected to the circuit board 4; in the process of pushing the lever 7 to open the operating mechanism 6, the operating mechanism 6 It drives the rotating shaft 8 to rotate, and then drives the moving contact 9 arranged on the rotating shaft 8 to move. During the movement of the moving contact 9, it is first electrically disconnected from the static contact 10, and then electrically disconnected from the circuit board 4; when an overload or short circuit fault occurs, the releaser 5 drives the operating mechanism 6 to perform a tripping action. The tripping action causes the operating mechanism 6 to change from the closed position to the open position, thereby driving the rotating shaft 8 to rotate, and then drives the moving contact 9 arranged on the rotating shaft 8 to move. During the movement of the moving contact 9, it is first electrically disconnected from the static contact 10, and then electrically disconnected from the circuit board 4.

[0073] The optional technical solution of this embodiment also includes a conductive structure 11, a first conductive wire 12 and a second conductive wire 13. The conductive structure 11 is electrically connected to the circuit board 4 through the first conductive wire 12, and the static contact 10 is electrically connected to the circuit board 4 through the second conductive wire 13; the conductive structure 11 is located on the movement path of the moving contact 9, and during the closing process, the moving contact 9 is connected to the conductive structure 11 and the static contact 10 in turn, and during the opening and tripping process, the moving contact 9 is separated from the static contact 10 and the conductive structure 11 in turn.

[0074] In this embodiment, by arranging a conductive structure 11 on the movement path of the moving contact 9, and the conductive structure 11 is located between the static contact 10 and the moving contact 9, the moving contact 9 can first connect with the conductive structure 11 and then connect with the static contact 10 during the closing movement, and the moving contact 9 can first separate from the static contact 10 and then separate from the conductive structure 11 during the opening and tripping movements. At the same time, the conductive structure 11 is electrically connected to the circuit board 4 through the first conductive line 12, and the static contact 10 is electrically connected to the circuit board 4 through the second conductive line 13. The overall structure is simple, occupies little space, and improves space utilization.

[0075] The following takes a DC circuit breaker as an example:

[0076] In this embodiment, Figure 9-12 As shown, the circuit breaker forms a pole of the same polarity by connecting in series. All the cavities 3 on the left side of the circuit board 4 are positive poles, with two terminals, one for power supply and one for load. All the cavities 3 on the right side of the circuit board 4 are negative poles, with two terminals, one for power supply and one for load.

[0077] When the circuit breaker is turned on, the circuit board 4 is not connected to the moving contact 9 and the stationary contact 10. The circuit board 4 needs to be powered by the arc voltage generated when the circuit breaker is closed or opened to make the circuit board 4 connected to the moving contact 9 and the stationary contact 10.

[0078] When the circuit breaker is turned on, there is no arc, so the circuit board 4 is not conducting with the moving contact 9 and the stationary contact 10. The current flows through all poles of the circuit breaker, that is, it flows in from the power supply end of the left pole of the circuit board 4, flows out from the load end of the left pole of the circuit board 4, then flows in from the load end of the right pole of the circuit board 4, and flows out from the power supply end of the right pole of the circuit board 4.

[0079] The circuit board 4 includes a first circuit board 41 located on the upper side and a second circuit board 42 located on the lower side. The first circuit board 41 and the second circuit board 42 are isolated from each other. When an arc is generated during the process of the circuit breaker being turned on or off, the arc voltage supplies power to the circuit board 4 so that the circuit board 4 is turned on with the moving contact 9 and the stationary contact 10. The moving contact 9 is connected to the conductive structure 11, and the current path is, the left stationary contact 10-first circuit board 41-left moving contact 9-right moving contact 9-second circuit board 42-right stationary contact 10.

[0080] When there are an even number of cavities 3, see Appendix Fig.10 and attached Fig.11 , the circuit board 4 is located in any one of the two middle cavities 3. All cavities 3 on the left side of the circuit board 4 are one pole of one polarity, and all cavities 3 on the right side of the circuit board 4 are one pole of another polarity, so that the first conductive wires 12 and the second conductive wires 13 of the first circuit board 41 and the second circuit board 42 can be connected to the adjacent cavities 3, which is convenient for wiring.

[0081] However, the present invention is not limited thereto. The circuit breaker may have only a positive pole or a negative pole, and the circuit board 4 may be located on one side of the positive pole or the negative pole. Specifically, in the case of a single-pole circuit breaker, the circuit board is located on one side of all poles. The circuit breaker may also have a positive pole and a negative pole, and the circuit board 4 may be located not only between the positive pole and the negative pole, but also on the other side of any pole.

[0082] It should be noted that when the DC circuit breaker includes a positive pole and a negative pole, in this embodiment, the two adjacent left and right cavities 3 where the circuit board 4 is located can be of the same polarity. This setting method makes it necessary for the first conductive wire 12 and the second conductive wire 13 of one of the first circuit board 41 and the second circuit board 42 to cross the cavity 3 to the cavity 3 of the other polarity when wiring, which makes wiring complicated.

[0083] As attached Figure 8 As shown, the contact system can be a rotating double-breakpoint contact system, with a pair of moving contacts 9 and a stationary contact 10 on each side of the rotating shaft 8, and the two moving contacts 9 are symmetrically arranged with respect to the rotation center of the rotating shaft 8 and are integrated. Then the circuit board 4 can be connected to the stationary contact 10 and the moving contact 9 on the left side of the rotating shaft 8, or the circuit board 4 can also be connected to the stationary contact 10 on the left side of the rotating shaft 8 and the moving contact 9 on the right side of the rotating shaft 8.

[0084] Preferably, the resistance of the conductive structure 11 is greater than the resistance of the movable contact 9. Since the movable contact 9 conducts electricity when the circuit is connected, the resistance of the movable contact 9 should be small. When the circuit is disconnected, the circuit board 4 absorbs the arc energy. The large resistance of the conductive structure 11 can reduce the arc energy, thereby reducing the difficulty of the circuit board 4 absorbing the arc energy.

[0085] If the current is small enough, only one of the first circuit board 41 and the second circuit board 42 may be used, and the left or right pole may be connected.

[0086] The following takes an AC circuit breaker as an example:

[0087] In this embodiment, Figure 9-12 As shown, the circuit breakers are connected in series to form a pole of the same phase. All the cavities 3 on the left side of the circuit board 4 are one phase, with two terminals, one for power supply and one for load. All the cavities 3 on the right side of the circuit board 4 are another phase, with two terminals, one for power supply and one for load.

[0088] like Fig.13 As shown, the circuit breaker may also have five chambers for a three-phase AC circuit breaker.

[0089] In the optional technical solution of this embodiment, the conductive structure 11 includes a first connecting rib 14 and an elastic clamping structure arranged on the first connecting rib 14; the elastic clamping structure forms a clamping space 15 for clamping the moving contact 9, and the moving contact 9 can move in and out of the clamping space 15 by moving.

[0090] In this embodiment, the elastic clamping structure is installed in the cavity 3 where the circuit board 4 is located through the first connecting rib 14. The moving contact 9 can move in and out of the clamping space 15. When the moving contact 9 enters the clamping space 15, the moving contact 9 is clamped by the elastic clamping force of the elastic clamping structure to achieve electrical connection between the moving contact 9 and the circuit board 4. The structure is simple and the stability of the conductive effect is improved.

[0091] In the optional technical solution of this embodiment, the elastic clamping structure includes a first arm 16 and a second arm 17. The first arm 16 and the second arm 17 are arranged opposite to each other and a clamping space 15 is formed therebetween; the first arm 16 has clamping elasticity, and / or the second arm 17 has clamping elasticity.

[0092] In this embodiment, the clamping elasticity means that after the moving contact 9 enters the clamping space 15, the elastic clamping structure can provide elastic force to maintain the clamping state, and after the moving contact 9 exits the clamping space 15, the elastic clamping structure can reset.

[0093] In this embodiment, the first arm 16 may have clamping elasticity, and the second arm 17 may not have clamping elasticity. When the moving contact 9 enters the clamping space 15, the first arm 16 clamps the moving contact 9 between the first arm 16 and the second arm 17 under the action of the clamping elasticity, and the connection is reliable. Alternatively, the second arm 17 may have clamping elasticity, and the first arm 16 may not have clamping elasticity. When the moving contact 9 enters the clamping space 15, the second arm 17 clamps the moving contact 9 between the first arm 16 and the second arm 17 under the action of the clamping elasticity, and the connection is also reliable. Preferably, both the first arm 16 and the second arm 17 have clamping elasticity. When the moving contact 9 enters the clamping space 15, both the first arm 16 and the second arm 17 clamp the moving contact 9 between the first arm 16 and the second arm 17 under the action of the clamping elasticity. Both sides of the moving contact 9 are clamped under the action of elastic force, and the electrical connection is more reliable.

[0094] In the optional technical solution of this embodiment, the first arm 16 includes a first arm body 18 and a second connecting rib 19; the second connecting rib 19 has two opposite ends, and one end is connected to the first connecting rib 14, and the other end is connected to the first arm body 18; the first arm body 18 and the second connecting rib 19 are relatively bent, and the first arm body 18 is located on the side of the second connecting rib 19 facing the second arm 17.

[0095] In this embodiment, the first arm 16 is bent as a whole, and the bending angle is greater than 90°. The two relatively bent sections form the first arm body 18 and the second connecting rib 19 respectively. The first arm body 18 and the second connecting rib 19 are relatively bent to make the first arm 16 have clamping elasticity, that is, the first arm body 18 can move toward the second connecting rib 19 under the action of external force, and the first arm body 18 can be reset after the external force is removed. When the moving contact 9 is inserted into the clamping space 15, it first contacts with the first arm body 18. At this time, the first arm body 18 has a guiding effect. Continued insertion makes the first arm body 18 move toward the second connecting rib 19, so that the first arm body 18 generates a reset elastic force and clamps the moving contact 9 between the first arm body 18 and the second arm 17. The first arm 16 has a simple structure, is easy to manufacture, and has a good clamping effect.

[0096] In this embodiment, the first arm body 18 and the second connecting rib 19 can be arranged opposite to each other, and the first arm body 18 is located between the second connecting rib 19 and the second arm 17. An elastic member is arranged between the first arm body 18 and the second connecting rib 19. The elastic member enables the first arm 16 to have clamping elasticity, that is, the first arm body 18 can elastically compress the elastic member under the action of external force, and the elastic member elastically resets after the external force is removed, thereby resetting the first arm body 18. In this way, the elastic clamping effect of the first arm 16 can also be achieved.

[0097] In the optional technical solution of this embodiment, the second arm 17 includes a second arm body 20 and a third connecting rib 21; the third connecting rib 21 has two opposite ends, and one end is connected to the first connecting rib 14, and the other end is connected to the second arm body 20; the second arm body 20 and the third connecting rib 21 are relatively bent, and the second arm body 20 is located on the side of the third connecting rib 21 facing the first arm 16.

[0098] In this embodiment, the implementation of the second arm 17 is the same as that of the first arm 16, and therefore has the same technical effect, which will not be described again herein.

[0099] In the optional technical solution of this embodiment, the conductive member 11 is located on the inner side of the moving contact 9, wherein the inner side of the moving contact 9 is the side of the moving contact 9 facing the stationary contact 10. Further, the moving contact 9 is arc-shaped, and the conductive structure 11 is located on the inner arc side of the moving contact 9. The arc-shaped moving contact 9 can avoid the conductive structure 11 during opening and tripping, and the end of the moving contact 9 can be connected to the stationary contact 10 and the conductive structure 11 at the same time when closing, thereby reducing the overall occupied space and improving the space utilization rate.

[0100] In the optional technical solution of this embodiment, the conductive structure 11 is in sheet form and is integrally formed. It is easy to manufacture, has high structural strength, and has a large conductive contact surface. The sheet structure enables the first arm 16 and the second arm 17 to have good clamping elasticity. At the same time, the conductive structure 11 is made of metal material and has good conductive effect. Preferably, the conductive structure 11 is made of copper sheet.

[0101] It should be noted that the circuit breaker of this embodiment may be equipped with an arc extinguishing system, i.e., an arc extinguishing chamber 23, or may not be equipped with an arc extinguishing chamber 23, depending on the specific situation. Since the circuit board 4 absorbs the energy generated during short circuit breaking, the arc between the moving contact 9 and the stationary contact 10 is very small during breaking, so the arc extinguishing chamber 23 may not be equipped. If the circuit breaker is to be equipped with an arc extinguishing chamber 23 in order to improve reliability so that the circuit breaker can be successfully broken several times even when the circuit board 4 fails, the circuit breaker needs to be equipped with an arc extinguishing chamber 23.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circuit breaker, characterized in that: include: A circuit board (4), a moving contact (9) and a stationary contact (10), wherein the stationary contact (10) is electrically connected to the circuit board (4); During the closing process, the moving contact (9) is electrically connected to the circuit board (4) and the stationary contact (10) in sequence; During the opening and tripping process, the moving contact (9) is disconnected electrically from the stationary contact (10) and the circuit board (4) in sequence.

2. The circuit breaker according to claim 1, characterized in that: It also comprises a conductive structure (11), a first conductive line (12) and a second conductive line (13), wherein the conductive structure (11) is electrically connected to the circuit board (4) via the first conductive line (12), and the static contact (10) is electrically connected to the circuit board (4) via the second conductive line (13); The conductive structure (11) is located on the moving path of the moving contact (9), and during the closing process, the moving contact (9) is connected to the conductive structure (11) and the stationary contact (10) in sequence, and during the opening and tripping processes, the moving contact (9) is separated from the stationary contact (10) and the conductive structure (11) in sequence.

3. The circuit breaker according to claim 2, characterized in that: The conductive structure (11) comprises a first connecting rib (14) and an elastic clamping structure arranged on the first connecting rib (14); The elastic clamping structure forms a clamping space (15) for clamping the moving contact (9), and the moving contact (9) can move in and out of the clamping space (15) by moving.

4. The circuit breaker according to claim 3, characterized in that: The elastic clamping structure comprises a first arm (16) and a second arm (17), the first arm (16) and the second arm (17) are arranged opposite to each other, and the clamping space (15) is formed therebetween; The first arm (16) has clamping elasticity, and / or the second arm (17) has clamping elasticity.

5. The circuit breaker according to claim 4, characterized in that: The first arm (16) comprises a first arm body (18) and a second connecting rib (19); The second connecting rib (19) has two opposite ends, one end of which is connected to the first connecting rib (14) and the other end of which is connected to the first arm (18); The first arm body (18) and the second connecting rib (19) are bent relative to each other, and the first arm body (18) is located on a side of the second connecting rib (19) facing the second arm (17).

6. The circuit breaker according to claim 4, characterized in that: The second arm (17) comprises a second arm body (20) and a third connecting rib (21); The third connecting rib (21) has two opposite ends, one end of which is connected to the first connecting rib (14) and the other end of which is connected to the second arm (20); The second arm body (20) and the third connecting rib (21) are bent relative to each other, and the second arm body (20) is located on a side of the third connecting rib (21) facing the first arm (16).

7. The circuit breaker according to claim 2, characterized in that: The conductive structure (11) is located on the inner side of the moving contact (9).

8. The circuit breaker according to claim 7, characterized in that: The moving contact (9) is arc-shaped, and the conductive structure (11) is located on the inner arc side of the moving contact (9).

9. The circuit breaker according to claim 2, characterized in that: The conductive structure (11) is in sheet shape and is integrally formed.

10. The circuit breaker according to claim 2, characterized in that: The resistance of the conductive structure (11) is greater than the resistance of the moving contact (9).

11. The circuit breaker according to any one of claims 1 to 10, characterized in that: When the circuit breaker is an AC circuit breaker, it has at least one pole with the same phase, or, when the circuit breaker is a DC circuit breaker, it has at least one pole with the same polarity; The circuit board (4) is located on one side of a pole.

12. The circuit breaker according to any one of claims 1 to 10, characterized in that: When the circuit breaker is an AC circuit breaker, it has at least two poles of different phases, or, when the circuit breaker is a DC circuit breaker, it has at least two poles of different polarities; The circuit board (4) comprises a first circuit board (41) and a second circuit board (42) which are isolated from each other, and when an arc is generated during the process of the circuit breaker being turned on or off, the moving contact (9) is electrically connected to the circuit board (4), and the arc voltage supplies power to the circuit board (4) so ​​that the circuit board (4) is turned on by the moving contact (9) and the static contact (10), and at this time, the current path is a power supply end of one pole - the first circuit board (41) - a load end of one pole - a load end of the other pole - the second circuit board (42) - a power supply end of the other pole.

13. The circuit breaker according to claim 12, characterized in that: The first circuit board (41) is located on the upper side and the second circuit board (42) is located on the lower side, and the current path is the static contact (10) of one pole - the first circuit board (41) - the moving contact (9) of one pole - the moving contact (9) of the other pole - the second circuit board (42) - the static contact (10) of the other pole.

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