Circuit breakers and leakage protectors

Abstract

The present application discloses a circuit breaker and leakage protector. The circuit breaker includes a base, a conductive system, a test torsion spring, an operating mechanism, and a shielding member: the base is provided with a mounting hole; the conductive system includes a first lead and a second lead, and the mounting hole is configured for insertion of the first lead; the test torsion spring is rotatably mounted on the base, and the test torsion spring includes a first pin and a second pin, the first pin being used to electrically couple with the first lead, and the second pin being used to electrically couple with the second lead; the operating mechanism is mounted on the base, and the operating mechanism is used to drive the first pin to contact the first lead; the shielding member is connected to the operating mechanism, and the shielding member is configured to shield the mounting hole when the first lead is not inserted when the circuit breaker is closed. By providing the shielding member, the reliability of the circuit breaker can be improved.

Description

Technical Field

[0001] The present application relates to circuit breaker manufacturing, and in particular to a circuit breaker and a leakage protector. Background Art

[0002] The leakage protector is a module in a circuit breaker with leakage protection function. It uses leakage current or the resulting change in neutral point-to-ground voltage as an action signal, so there is no need to adjust the action value based on the current value. Therefore, it has high sensitivity and can effectively cut off the power supply after action to prevent electric shock.

[0003] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and closing, carrying, and interrupting current under abnormal circuit conditions within a specified timeframe. Circuit breakers are used to distribute electrical energy and protect power lines and motors. They automatically disconnect circuits in the event of severe overloads, short circuits, undervoltages, or other faults. Furthermore, interrupting fault current generally requires no component replacement. They have gained widespread application.

[0004] Since existing circuit breakers typically require regular testing during use, and power is required to complete the test, a dual-breakpoint design has been proposed in the related art to improve circuit breaker reliability. Compared to a single-breakpoint design, the dual-breakpoint design ensures that, regardless of whether the circuit breaker is installed at the incoming line terminal on the circuit breaker side to draw power or at the outgoing line terminal on the circuit breaker side to remove power, as long as the main circuit is disconnected, the test circuit is de-energized.

[0005] However, the above double-breakpoint design still has the risk that the test circuit is still energized after the main circuit is disconnected, and how to improve the reliability of circuit breakers has become a difficult problem in the industry. Summary of the Invention

[0006] The embodiments of the present application provide a circuit breaker and a leakage protector, which can effectively improve the reliability of the circuit breaker and reduce risks.

[0007] In a first aspect, an embodiment of the present application provides a circuit breaker, comprising a base, a conductive system, a test torsion spring, an operating mechanism, and a shielding member: the base is provided with a mounting hole; the conductive system comprises a first lead and a second lead, and the mounting hole is configured for insertion of the first lead; the test torsion spring is rotatably mounted on the base, the test torsion spring comprises a first pin and a second pin, the first pin is used to electrically couple with the first lead, and the second pin is used to electrically couple with the second lead; an operating mechanism is mounted on the base, the operating mechanism is used to drive the first pin to contact the first lead; a shielding member is connected to the operating mechanism, and the shielding member is configured to shield the mounting hole when the first lead is not inserted when the circuit breaker is closed.

[0008] In the above technical solution, the operating mechanism can drive the shielding member to move. In the closed state, if the first lead is not inserted into the mounting hole, the operating mechanism drives the shielding member to move, and the shielding member can block the mounting hole. At this time, the first lead cannot be inserted into the mounting hole, reminding the operator that the first lead cannot be inserted in the closed state and needs to be inserted into the mounting hole in the open state. Therefore, the first pin is always above the first lead, and the first pin and the first lead can be in contact or separated. This reduces the risk of the first pin being unable to separate below the first lead when assembling the circuit breaker in the closed state, and the first breakpoint failing. This improves the reliability of the circuit breaker.

[0009] In some embodiments, the shielding member is rotatably mounted to the base, a return torsion spring is disposed between the shielding member and the base, and the shielding member is connected to the operating mechanism via an elastic member. When the first lead is installed in the mounting hole in the open state and then the switch is closed, the shielding member, under the action of the elastic member, can avoid interference with the first lead, thereby preventing the shielding member from interfering with the first lead.

[0010] In some embodiments, the shielding member includes a mounting portion, a first cantilever and a second cantilever, the mounting portion is rotatably mounted on the base, the first cantilever and the second cantilever are arranged on both sides of the mounting portion, the elastic member is connected between the second cantilever and the operating mechanism, and the first cantilever is configured to be able to block the mounting hole in which the first lead is not inserted when the switch is closed.

[0011] In some embodiments, the base is provided with a first mounting axis, and the shielding member and the test torsion spring are both mounted on the first mounting axis. This facilitates synchronous operation of the shielding member and the test torsion spring under the action of an operating mechanism, and the shielding member and the test torsion spring share the operating mechanism, eliminating the need for additional components. Furthermore, the shielding member and the test torsion spring can be arranged axially along the first mounting axis, reducing space occupied in a plane perpendicular to the first mounting axis.

[0012] In some embodiments, the operating mechanism includes a handle, a support, a lock, a jump lock and a connecting rod, the support is rotatably connected to the base, the jump lock and the lock are rotatably connected to the support, one end of the connecting rod is connected to the lock, and the other end is connected to the handle, and the shielding member is connected to the support through the elasticity.

[0013] In some embodiments, the circuit breaker further includes a mechanism end cover mounted on the base, the operating mechanism being located between the base and the mechanism end cover, and the mechanism end cover being configured to restrict movement of the operating mechanism away from the base. Providing the mechanism end cover can reduce the likelihood of various components of the operating mechanism, such as the latch and trip latch, falling away from the base.

[0014] In some embodiments, the circuit breaker further includes a test button, a middle seat and an upper cover, wherein the middle seat is arranged between the upper cover and the base, and the upper cover, the middle seat and the base enclose a storage space, and the storage space is used to accommodate the conductive system, the operating mechanism, the mechanism end cover, the test torsion spring and the shielding member; the test button is installed on the middle seat and is located on the side of the mechanism end cover away from the base, and the test button is used to drive the second pin to contact the second lead.

[0015] In some embodiments, the test torsion spring includes a spiral body, with a first pin and a second pin connected to the spiral body. The spiral body and the first pin are both located between the mechanism end cover and the base, and the second pin extends to the side of the mechanism end cover facing away from the base. The test button is mounted on the center seat, increasing the distance between the test button and the operating mechanism or base, thereby reducing installation difficulty while not affecting the mechanism top cover's ability to restrict movement of the various components of the operating mechanism away from the base.

[0016] In some embodiments, the circuit breaker further includes an indicator light electrically coupled to the conductive system. When the first lead contacts the first pin and the second lead contacts the second pin, the indicator light illuminates. The indicator light can illuminate to alert operators that the circuit breaker's tripping protection function has failed, thereby preventing operators from continuously pressing the test button or resetting it promptly, thereby preventing the test circuit from being energized for a prolonged period of time, which could potentially cause danger.

[0017] In a second aspect, an embodiment of the present application further provides a leakage protector, and the circuit breaker includes the circuit breaker provided by any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of a double breakpoint design of related technologies in some embodiments of the present application;

[0020] Figure 2 A schematic diagram of double-breakpoint failure in some embodiments of the present application;

[0021] Figure 3 This is a schematic structural diagram of a circuit breaker in some embodiments of the present application;

[0022] Figure 4This is an exploded schematic diagram of a circuit breaker according to some embodiments of the present application;

[0023] Figure 5 A schematic diagram of the internal structure of a circuit breaker according to some embodiments of the present application;

[0024] Figure 6 for Figure 1 The schematic diagram of the structure after the base is hidden shows the gate open state;

[0025] Figure 7 A schematic diagram of a closing state of some embodiments of the present application;

[0026] Figure 8 Schematic diagram of the assembly of a shielding member and a test torsion spring according to some embodiments of the present application;

[0027] Figure 9 This is a schematic structural diagram of a shielding member in some embodiments of the present application;

[0028] Figure 10 A schematic diagram of a partial structure of a base in some embodiments of the present application;

[0029] Figure 11 A schematic diagram of a partial structure of the assembly of the base and the mechanism top cover in some embodiments of the present application;

[0030] Figure 12 A top cover for the mechanism of some embodiments of the present application;

[0031] Figure 13 This is a partial cross-sectional view of a circuit breaker according to some embodiments of the present application.

[0032] Icons: 100-circuit breaker; 11-base; 111-mounting hole; 112-first mounting axis; 113-second mounting axis; 12-middle seat; 13-upper cover; 20-operating mechanism; 21-handle; 22-support; 23-lock; 24-trip buckle; 25-connecting rod; 30-conductive system; 31-first lead; 32-second lead; 33-transformer; 34-circuit board; 40-test torsion spring; 41-first pin; 42-second pin; 43-spiral body; 50-test button; 60-shielding member; 61-first cantilever; 62-second cantilever; 621-mounting slot; 63-mounting part; 631-through hole; 70-elastic member; 80-reset torsion spring; 90-mechanism end cover; 91-avoidance hole; 1-indicator light; 2-tripping mechanism; A-main circuit. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0035] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0037] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0038] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0039] The specific working principle of the circuit breaker is: when the main circuit (i.e. the power system) generates residual current (such as leakage), the transformer detects the residual operating current and transmits the signal to the circuit board. The circuit board makes a judgment and outputs a tripping signal to drive the tripping mechanism to operate. The tripping mechanism drives the lock and tripping button on the operating mechanism to unlock, thereby disconnecting the current of the main circuit.

[0040] The circuit breaker includes a conductive system, an operating mechanism, and a test torsion spring. The two pins of the test torsion spring serve as moving contacts, creating a dual-breakpoint design. When both pins come into contact with the test leads, the test circuit is conductive. If one pin becomes a stationary contact, the circuit fails, resulting in a single breakpoint.

[0041] like Figure 1 As shown, Figure 1 This is a schematic diagram of a dual-breakpoint design related to some embodiments of the present application. A circuit breaker 100 includes a conductive system 30. A test torsion spring 40 includes a first pin 41 and a second pin 42. The first pin 41 is electrically coupled to the first lead 31 of the conductive system 30, while the second pin 42 is electrically coupled to the second lead 32 of the conductive system 30. Typically, the operating mechanism 20 brings the first pin 41 into contact with the first lead 31, while the test button 50 brings the second pin 42 into contact with the second lead 32. Both the first pin 41 and the second pin 42 are movable contacts, creating a dual-breakpoint design that is more reliable than a single-breakpoint design.

[0042] In-depth research has found that the double breakpoint design may fail. If the double breakpoint fails, there will be risks when the test circuit is energized. Figure 2 , Figure 2 Schematic diagram of double breakpoint failure in some embodiments of the present application. The first pin 41 is inserted below the first lead 31 (as shown in FIG. Figure 2 As shown), the first pin 41 and the first lead 31 cannot be separated and disconnected. The first pin 41 and the first lead 31 are in contact all year round. The breakpoint is in a failure state and the double breakpoint design fails.

[0043] The reason why the first pin 41 is inserted below the first lead 31 is that when assembling the circuit breaker 100, the operating mechanism 20 and the test torsion spring 40 are typically assembled first, and finally the first lead 31 is inserted into the mounting hole 111 of the base 11 to secure the position of the first lead 31. If assembled in the open state, the first pin 41 is above the mounting hole 111, and the aforementioned operation will not cause the first pin 41 to be inserted below the first lead 31, and there will be no double breakpoint failure. However, if assembled in the closed state, that is, in the closed state, that is, the operating mechanism 20 and the test torsion spring 40 are assembled first, and then the pin is inserted into the corresponding mounting hole 111, the first pin 41 may be inserted below the first lead 31, resulting in a double breakpoint failure. The main reason is that the first pin 41 is a moving contact. In order to achieve effective electrical coupling between the first pin 41 and the first lead 31, there needs to be an interaction force between the first pin 41 and the second pin 42 when they contact each other. The first pin 41 needs to intersect with the first lead 31 and extend beyond a portion. In addition, installation errors of various components or manufacturing errors of the test torsion spring 40 will result in the first pin 41 of the test torsion spring 40 being driven to the bottom of the mounting hole 111 by the operating mechanism 20 when the circuit breaker is in the closed state and the pin has not yet been installed in the mounting hole 111. At this time, when the pin is inserted, the first pin 41 of the test torsion spring 40 is located below the first lead 31. After that, even if the circuit breaker is opened, the first pin 41 cannot be separated from the first lead 31, and the breakpoint at this location fails. The moving contact designed at this location becomes a static contact, and the double breakpoint fails, becoming a single breakpoint design, which affects the reliability of the circuit breaker 100.

[0044] In addition to the double break failure caused by assembly errors during assembly of the circuit breaker 100, when the circuit breaker 100 is in use, as long as the first lead 31 falls off from the mounting hole 111, the double break failure may also occur if the first lead 31 is installed in the closed state.

[0045] It should be noted that the first pin 41 is not necessarily inserted under the first lead 31. Inserting the first pin 41 under the first lead 31, resulting in double breakpoint failure, is a rare case. The operator is usually unaware of the double breakpoint failure, and leakage of the main circuit A is also rare. The double breakpoint failure is difficult to detect. Once discovered, the danger has already occurred.

[0046] In view of this, the embodiments of the present application provide a technical solution. By providing a shielding member 60 in the circuit breaker 100, the shielding member 60 is configured to block the mounting hole 111 when no pin is inserted when the circuit breaker is closed. Therefore, in the closed state, the pin cannot be inserted into the mounting hole 111. The pin can only be inserted and assembled after the circuit breaker 100 is restored to the open state. This reduces the possibility of the first pin 41 of the test torsion spring 40 being inserted under the first lead 31, reduces the risk of a double breakpoint failure becoming a single breakpoint, and improves the reliability of the circuit breaker 100.

[0047] The specific structure of the circuit breaker 100 is described in detail below with reference to the accompanying drawings.

[0048] An embodiment of the present application provides a circuit breaker 100 , which includes a base 11 , a conductive system 30 , a test torsion spring 40 , an operating mechanism 20 , and a shielding member 60 .

[0049] Reference Figure 3 and Figure 4 The circuit breaker 100 includes a base 11, two middle bases 12, and an upper cover 13. The base 11, two middle bases 12, and upper cover 13 enclose a housing space. The conductive system 30, test torsion spring 40, operating mechanism 20, and shielding member 60 are mounted in the housing space. The base 11 is provided with a mounting hole 111.

[0050] Reference Figure 5 and Figure 6 The conductive system 30 includes a first lead 31 and a second lead 32 , and the mounting hole 111 is configured to allow the first lead 31 to be inserted.

[0051] The test torsion spring 40 is rotatably mounted on the base 11 and includes a first pin 41 and a second pin 42. The first pin 41 is electrically coupled to the first lead 31, and the second pin 42 is electrically coupled to the second lead 32. When the first pin 41 is electrically coupled to the first lead 31 and the second pin 42 is electrically coupled to the second lead 32, the test circuit is conductive. This conductive test circuit can simulate a short-circuit current and determine whether the circuit breaker 100 is functioning properly.

[0052] The operating mechanism 20 is mounted on the base 11 , and is used to drive the first pin 41 to contact the first lead 31 .

[0053] The shielding member 60 is connected to the operating mechanism 20 , and is configured to shield the mounting hole 111 into which the first lead 31 is not inserted when the switch is closed.

[0054] The conductive system 30 is a device in the circuit breaker 100 for sensing residual current and issuing a circuit breaking command. The first lead 31 contacts the first pin 41, and the second pin 42 contacts the second lead 32. The test circuit is connected. The formed test circuit simulates a residual current passing through the circuit breaker 100, thereby testing the circuit breaking function of the circuit breaker 100.

[0055] In the dual-breakpoint design, both the first pin 41 and the second pin 42 are movable contacts. For ease of description, the connection between the first lead 31 and the first pin 41 is referred to as the first breakpoint, and the connection between the second lead 32 and the second pin 42 is referred to as the second breakpoint. When the first pin 41 is electrically coupled to the first lead 31 and the second pin 42 is electrically coupled to the second lead 32, the test circuit is conductive, simulating a short circuit. When the first pin 41 is separated from the first lead 31 or the second pin 42 is separated from the second lead 32, the test circuit is disconnected and de-energized. In other words, disconnecting at least one of the first and second breakpoints disconnects the test circuit, rendering it de-energized.

[0056] The operating mechanism 20 is used to drive the first pin 41 of the test torsion spring 40 into contact with the first lead 31, thereby facilitating conduction of the auxiliary test circuit. Furthermore, the operating mechanism 20 is used to operate the mechanism of the main circuit A to open or close the circuit, thereby disconnecting or connecting the circuit of the main circuit A. For ease of description, the terms "opening" and "closing" mentioned below refer to the operation of the operating mechanism 20 of the circuit breaker 100.

[0057] In this embodiment, the operating mechanism 20 can drive the shielding member 60 to operate. In the closed state, if the first lead 31 is not inserted into the mounting hole 111, the operating mechanism 20 drives the shielding member 60 to operate, and the shielding member 60 can block the mounting hole 111. At this time, the first lead 31 cannot be inserted into the mounting hole 111, reminding the operator that the first lead 31 cannot be inserted in the closed state and needs to be inserted into the mounting hole 111 in the open state. As a result, the first pin 41 is always above the first lead 31, and the first pin 41 and the first lead 31 can contact or separate. This reduces the risk of the first pin 41 being unable to separate below the first lead 31 when assembling the circuit breaker 100 in the closed state, thereby improving the reliability of the circuit breaker 100.

[0058] The first pin 41 and the second pin 42 are both moving contacts, forming a double breakpoint design. By setting the shielding member 60, the possibility of failure of the first breakpoint (the first pin 41 cooperates with the first lead 31) can be reduced. When the double breakpoints do not fail, whether the power is measured at the input end of the circuit breaker or the output end of the circuit breaker, as long as one of the first breakpoint and the second breakpoint is disconnected, the test circuit will not be energized, thereby improving the reliability of the circuit breaker 100.

[0059] It should be noted that, in the open state, the first lead 31 will not be inserted under the mounting hole 111. The purpose of setting the shielding member 60 is to prevent the first lead 31 from being inserted into the mounting hole 111 in the closed state, and to drive the operator to insert the first lead 31 into the mounting hole 111 in the open state. It should be understood that after the first lead 31 is installed and enters the closed state, the shielding member 60 should avoid the first lead 31 to prevent the first lead 31 from interfering with the shielding member 60.

[0060] Reference Figure 7 and Figure 8 , combined with reference Figure 5 In some embodiments, the shielding member 60 is rotatably mounted on the base 11 , a return torsion spring 80 is provided between the shielding member 60 and the base 11 , and the shielding member 60 is connected to the operating mechanism 20 via an elastic member 70 .

[0061] The reset torsion spring 80 has a high elastic modulus. The design of the reset torsion spring 80 is generally determined based on the reset force and reset travel required by the shield 60. During operation, when a reset is required, the reset torsion spring 80 is twisted, storing elastic potential energy, and then providing sufficient force to reset the shield 60 to its initial position when released. The reset torsion spring 80 is configured to reset the shield 60 to its initial position, which refers to the position in which the shield 60 does not block the mounting hole 111 when the circuit breaker 100 is in the open state. The reset torsion spring 80 can provide a reliable and consistent reset force, with a long life and high durability.

[0062] When the first lead 31 is installed in the mounting hole 111 in the open state and then the switch is closed, the shielding member 60 can avoid the first lead 31 (such as Figure 7 as shown), so as to prevent the shielding member 60 from interfering with the first lead 31.

[0063] Of course, in other embodiments, the shielding member 60 may also be a spring or other structure. In this case, the shielding member 60 and the operating mechanism 20 are not connected through the elastic member 70 , and the shielding member 60 can also play the role of avoiding the first lead 31 .

[0064] In some embodiments, reference Figure 9 and Figure 10 The shielding member 60 includes a mounting portion 63, a first cantilever 61 and a second cantilever 62. The mounting portion 63 is rotatably mounted on the base 11. The first cantilever 61 and the second cantilever 62 are arranged on both sides of the mounting portion 63. The elastic member 70 is connected between the second cantilever 62 and the operating mechanism 20. The first cantilever 61 is configured to block the mounting hole 111 into which the first lead 31 is not inserted when the switch is closed.

[0065] Specifically, the mounting portion 63 is provided with a through hole 631, and the base 11 is provided with a first mounting shaft 112, which is inserted into the through hole 631. A first cantilever 61 and a second cantilever 62 are connected to the mounting portion 63. The first cantilever 61, the mounting portion 63, and the second cantilever 62 are connected to form an inverted V-shape. The first cantilever 61 is provided on one side of the mounting portion 63, and the second cantilever 62 is provided on the other side of the mounting portion 63. The first cantilever 61 is used to block the mounting hole 111 where the first lead 31 is not inserted when the switch is closed. The second cantilever 62 is provided with a mounting groove 621. The side of the mounting groove 621 facing away from the base 11 is open, so that the elastic member 70 can be inserted into the mounting groove 621 from the side of the shielding member 60 facing away from the base 11, reducing assembly difficulty. The notch of the mounting groove 621 is opened on the side of the second cantilever 62 facing the operating mechanism 20. The slot opening of the mounting slot 621 is smaller than the slot bottom of the mounting slot 621 , and one end of the elastic member 70 of the mounting slot 621 is installed in the mounting slot 621 .

[0066] Reference Figure 8 In some embodiments, the shielding member 60 and the test torsion spring 40 are both mounted on the first mounting shaft 112 .

[0067] Specifically, the shielding member 60 and the test torsion spring 40 are coaxially arranged and mounted on the same mounting axis. This arrangement facilitates synchronous operation of the shielding member 60 and the test torsion spring 40 under the control of the operating mechanism 20. The shielding member 60 and the test torsion spring 40 share the operating mechanism 20, eliminating the need for additional components. Furthermore, the shielding member 60 and the test torsion spring 40 are arranged axially along the first mounting axis 112, reducing space occupied in a plane perpendicular to the first mounting axis 112.

[0068] Reference Figure 7 In some embodiments, the operating mechanism 20 includes a handle 21, a support member 22, a lock 23, a jump lock 24 and a connecting rod 25. The support member 22 is rotatably connected to the base 11, the jump lock 24 and the lock 23 are rotatably connected to the support member 22, one end of the connecting rod 25 is connected to the lock 23, and the other end is connected to the handle 21, and the shielding member 60 is elastically connected to the support member 22.

[0069] The support member 22 may be provided with a slot, and the first pin 41 is inserted into the slot, so that the support member 22 rotates to drive the first pin 41 to contact or separate from the first lead 31 .

[0070] like Figure 10 As shown, the base 11 is provided with a second installation shaft 113 , and the second installation shaft 113 is used for installing the support member 22 .

[0071] Figure 6 shows the open state of the circuit breaker 100, Figure 7The diagram shows the closing state of the circuit breaker 100. The handle 21, the support 22, the lock 23, the trip 24 and the connecting rod 25 form a connecting rod mechanism. By driving the handle 21, the circuit breaker 100 can be driven to switch between the open state and the closed state. In the open state, the lock 23 and the trip 24 are unlocked, and in the closed state, the lock 23 and the trip 24 are locked with each other. When the handle 21 is driven from the open state to the closed state, the support 22 rotates clockwise, driving the first pin 41 to electrically couple with the first lead 31, and the support 22 drives the shielding member 60 to move. When the first lead 31 is not inserted into the mounting hole 111, the support 22 drives the shielding member 60 to block the mounting hole 111. When the first lead 31 is inserted into the mounting hole 111, under the action of the elastic member 70, the shielding member 60 can avoid the first lead 31.

[0072] Reference Figure 1 and Figure 7 In some embodiments, the conductive system 30 includes a circuit board 34, a first lead 31, a second lead 32, and a transformer 33. The first lead 31, the second lead 32, and the transformer 33 are all electrically coupled to the circuit board 34. When the handle 21 is actuated to close the circuit breaker 100, the first lead 31 is electrically coupled to the first lead 31, and the second lead 32 is electrically coupled to the second pin 42, the test circuit is conductive. The transformer 33 is used to sense the residual current in the main circuit A and the test circuit, and transmits a signal to the circuit board 34. Based on the current information sensed by the transformer 33, the circuit board 34 issues a command instructing the trip mechanism 2 to operate, triggering the lock 23 and the trip 24 to unlock. After the lock 23 and the trip 24 are unlocked, the circuit breaker 100 returns to the open state, thereby disconnecting the main circuit A and implementing the short-circuit protection function. The conductive test circuit is used to test whether the circuit breaker 100's circuit-breaking function is effective.

[0073] Reference Figure 11 and Figure 12 In some embodiments, the circuit breaker 100 further includes a mechanism end cover 90 , which is mounted on the base 11 . The operating mechanism 20 is located between the base 11 and the mechanism end cover 90 . The mechanism end cover 90 is used to limit the movement of the operating mechanism 20 away from the base 11 .

[0074] The base 11 is provided with a first installation shaft 112 , which is used to install the test torsion spring 40 . A side of the end cover mechanism facing the base 11 abuts against the first installation shaft 112 .

[0075] A narrow space is formed between the mechanism end cover 90 and the base 11 , thereby confining the operating mechanism 20 between the mechanism end cover 90 and the base 11 .

[0076] The various parts in the operating mechanism 20 are independently assembled to the base 11. Before the cover 13 is closed, these parts are not fixed. At this time, when installing parts such as the release and the mutual inductor 33, the parts of the operating mechanism 20 are likely to fall off, causing assembly difficulties or failure of the leakage function of the finished product. The provision of the mechanism end cover 90 can reduce the possibility of the various parts of the operating mechanism 20, such as the lock 23 and the jumper 24, falling off in a direction away from the base 11.

[0077] Reference Figure 3 Figure 4 In some embodiments, the circuit breaker 100 further includes a middle seat 12 and an upper cover 13. The middle seat 12 is arranged between the upper cover 13 and the base 11. The upper cover 13, the middle seat 12 and the base 11 form a receiving space, which is used to receive the conductive system 30, the operating mechanism 20, the mechanism end cover 90, the test torsion spring 40 and the shielding member 60.

[0078] Refer again Figure 13 The circuit breaker 100 further includes a test button 50 , which is mounted on the middle seat 12 and located on a side of the mechanism end cover 90 away from the base 11 . The test button 50 is used to drive the second pin 42 to contact the second lead 32 .

[0079] In the related art, the test button 50 is usually close to the operating mechanism 20 and the base 11, and the operating mechanism 20 and other components are compactly installed in a limited space, which makes installation difficult. In the present application, the test button 50 is installed on the middle seat 12, which increases the distance between the test button 50 and the operating mechanism 20 or the base 11, can reduce the installation difficulty while not affecting the mechanism top cover to restrict the various components of the operating mechanism 20 from moving in the direction away from the base 11.

[0080] Reference Figure 13 In some embodiments, the test torsion spring 40 includes a spiral body 43, a first pin 41 and a second pin 42 connected to the spiral body 43, the spiral body 43 and the first pin 41 are both located between the mechanism end cover 90 and the base 11, and the second pin 42 extends to the side of the mechanism end cover 90 away from the base 11.

[0081] like Figure 12 As shown, the mechanism end cover 90 is provided with an escape hole 91, which is a waist-shaped hole and is used to allow the second pin 42 to extend out of the accommodation space. The test button 50 drives the second pin 42 to electrically couple with the second lead 32 outside the accommodation space.

[0082] By actuating handle 21 to close circuit breaker 100, operating mechanism 20 electrically couples first pin 41 with first lead 31 via support member 22. Pressing test button 50 electrically couples second pin 42 with second lead 32, completing the test circuit and verifying the proper function of circuit breaker 100's circuit protection. If the trip mechanism operates to open circuit breaker 100, the circuit protection function is effective; otherwise, the circuit protection function is ineffective.

[0083] In the circuit breaker 100, in order to understand whether the circuit breaker function is normal, it is necessary to test whether the circuit breaker 100 can trip normally. In the closed state, the test button 50 will be pressed once a month for detection. The existing test circuit uses the test button 50 to detect whether the leakage protection function of the circuit breaker 100 is normal. In the double breakpoint design, when the test button 50 is pressed, the test button 50 applies pressure to the second pin 42, so that the second pin 42 is electrically coupled with the second lead 32, the test circuit is turned on, the mutual inductor 33 senses the short-circuit current, and transmits the signal to the circuit board 34. The circuit board 34 instructs the tripping mechanism 2 to operate so that the lock 23 and the tripping button 24 in the operating mechanism 20 are unlocked, and the first breakpoint is disconnected. After releasing the test button 50, the second pin 42 bounces up under the action of its own reaction force, the second pin 42 is separated from the second lead 32, and the second breakpoint is disconnected.

[0084] However, the trip mechanism 2 cannot be energized for a long period of time, otherwise it will burn out. Even with a dual-breakpoint design, continuously pressing the test button 50 will burn out the trip mechanism 2. At this time, the user is initially unaware of this and only releases the button when the product begins to smoke or smells burnt. By then, it is too late, causing not only failure of the circuit breaker 100 but also a high risk of fire. To this end, in some embodiments, the circuit breaker 100 may further include an indicator light 1 electrically coupled to the circuit board 34 of the conductive system 30. When the first lead 31 contacts the first pin 41 and the second lead 32 contacts the second pin 42, the indicator light 1 is illuminated.

[0085] The middle seat 12 is provided with a hole penetrating through the wall of the middle seat 12 to expose the indicator light 1. The operator can see from the appearance whether the indicator light 1 is lit.

[0086] When the first lead 31 contacts the first pin 41 and the second lead 32 contacts the second pin 42, the test circuit is connected and energized. When the test circuit is energized, the indicator light 1 is illuminated. That is, in the closed state, after pressing the test button 50, if the trip mechanism 2 fails or the first breakpoint fails (the first pin 41 is located below the first lead 31), the test circuit cannot be disconnected, the test circuit is energized, and the indicator light 1 is illuminated, which can alert the operator that the circuit breaker 100's circuit breaker protection function has failed. Therefore, the operator should not continue to press the test button 50 or reset the test button 50 promptly to avoid the test circuit being energized for a long time, which could cause danger.

[0087] An embodiment of the present application further provides a leakage protector, which includes the circuit breaker 100 provided in any of the above embodiments.

[0088] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0089] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A circuit breaker, characterized in that: include: A base, provided with a mounting hole; A conductive system comprising a first lead and a second lead, wherein the mounting hole is configured for insertion of the first lead; a test torsion spring rotatably mounted on the base, the test torsion spring comprising a first pin and a second pin, the first pin being used to electrically couple with the first lead, and the second pin being used to electrically couple with the second lead; an operating mechanism, mounted on the base, and configured to drive the first pin to contact the first lead; a shielding member connected to the operating mechanism, wherein the shielding member is configured to shield the mounting hole into which the first lead is not inserted when the switch is closed; The shielding member is rotatably mounted on the base, a return torsion spring is provided between the shielding member and the base, and the shielding member is connected to the operating mechanism via an elastic member; The shielding member includes a mounting portion, a first cantilever, and a second cantilever. The mounting portion is rotatably mounted on the base. The first cantilever and the second cantilever are disposed on both sides of the mounting portion. The elastic member is connected between the second cantilever and the operating mechanism. The first cantilever is configured to shield the mounting hole when the first lead is not inserted when the switch is closed. The base is provided with a first installation shaft, and the shielding member and the test torsion spring are both sleeved on the first installation shaft.

2. The circuit breaker according to claim 1, wherein: The operating mechanism includes a handle, a support, a lock, a jump lock and a connecting rod. The support is rotatably connected to the base, the jump lock and the lock are rotatably connected to the support, one end of the connecting rod is connected to the lock, and the other end is connected to the handle. The shielding member is connected to the support through the elastic member.

3. The circuit breaker according to claim 1, wherein: The circuit breaker further comprises: The mechanism end cover is installed on the base, the operating mechanism is located between the base and the mechanism end cover, and the mechanism end cover is used to limit the operating mechanism from moving in a direction away from the base.

4. The circuit breaker according to claim 3, characterized in that The circuit breaker further comprises: a middle seat and an upper cover, wherein the middle seat is arranged between the upper cover and the base, and the upper cover, the middle seat and the base enclose a receiving space, and the receiving space is used to receive the conductive system, the operating mechanism, the mechanism end cover, the test torsion spring and the shielding member; A test button is installed on the middle seat and is located on a side of the mechanism end cover away from the base, and the test button is used to drive the second pin to contact the second lead.

5. The circuit breaker according to claim 4, characterized in that The test torsion spring includes a spiral body, the first pin and the second pin are connected to the spiral body, the spiral body and the first pin are both located between the mechanism end cover and the base, and the second pin extends to the side of the mechanism end cover away from the base.

6. The circuit breaker according to claim 1, wherein: The circuit breaker further comprises: The indicator light is electrically coupled to the conductive system, and is lit when the first lead contacts the first pin and the second lead contacts the second pin.

7. A leakage protector, characterized in that: The circuit breaker comprises the circuit breaker according to any one of claims 1 to 6.

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