Thermomagnetic tripping mechanism and circuit breaker

Abstract

The utility model relates to a thermomagnetic tripping mechanism and a circuit breaker, and the mechanism comprises a wiring piece which extends lengthwise along a first direction to form an installation end; the first magnetic tripping piece and the support are installed at the installation end, and the support is provided with a supporting part protruding out of the installation end in the second direction; one end of the second magnetic tripping piece is rotationally connected with the supporting part around an axis extending in the third direction and forms an attraction part attracted with the first magnetic tripping piece, and the other end of the second magnetic tripping piece extends away from the mounting end in the second direction to form a first striking end; the resetting piece is arranged at the mounting end and is used for resetting the second magnetic tripping piece; one end of the thermal tripping piece is connected with the mounting end, and the other end of the thermal tripping piece extends away from the mounting end in the second direction to form a second striking end; the first direction, the second direction and the third direction intersect in pairs.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a thermal magnetic tripping mechanism and a circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close, carry and interrupt the current under normal circuit conditions and can close, carry and interrupt the current under abnormal circuit conditions within a specified time. Existing circuit breakers have the following shortcomings: the various structures of the circuit breaker are not installed compactly enough, such as the thermal magnetic tripping mechanism, the moving contact mechanism and the static contact mechanism. The structure is not compact enough when installed, and the space occupied is large, which leads to a large volume of the entire circuit breaker. Utility Model Content

[0003] Based on this, it is necessary to provide a thermal magnetic tripping mechanism and a circuit breaker to address the above problems. The thermal magnetic tripping mechanism has a compact structure and occupies a small space. The circuit breaker using the thermal magnetic tripping mechanism has a compact structure and a small size.

[0004] A thermal magnetic tripping mechanism, comprising:

[0005] A connecting piece, one end of which is longitudinally extended along a first direction to form a mounting end;

[0006] A first magnetic release member and a bracket mounted on the mounting end, the bracket having a support portion protruding from the mounting end along a second direction;

[0007] A second magnetic release member, one end of which is rotatably connected to the support portion around an axis extending along the third direction and forms an engaging portion that engages with the first magnetic release member, and the other end of which extends away from the mounting end along the second direction to form a first striking end;

[0008] A reset member provided at the mounting end, used for resetting the second magnetic release member;

[0009] A thermal release member, one end of which is connected to the mounting end, and the other end of which extends away from the mounting end along the second direction to form a second striking end;

[0010] The first direction, the second direction and the third direction intersect each other.

[0011] In one embodiment, the first striking end and the second striking end are spaced apart in both the first direction and the third direction.

[0012] In one embodiment, the first magnetic release member is a yoke, and the second magnetic release member is an armature; and / or

[0013] The thermal release component is a bimetallic strip.

[0014] In one embodiment, the first magnetic release member is U-shaped;

[0015] The first magnetic release component is fixedly connected to the outside of the mounting end from one side along the second direction, and two first protruding ears are formed at one end of the first magnetic release component in the second direction, the two first protruding ears and the support portion are protruded on the same side of the mounting end, and the two first protruding ears are used to engage with the second magnetic release component.

[0016] In one embodiment, the bracket is U-shaped;

[0017] The bracket is fixedly connected to the outside of the mounting end from one side along the second direction, and two second protruding ears of the bracket protruding from the other side of the mounting end in the second direction form the supporting portion, and the second magnetic release member is rotatably connected to the two second protruding ears at both ends in the third direction.

[0018] In one embodiment, the mounting end comprises a first mounting section and a second mounting section which are connected to each other and arranged in a stepped manner, and an end surface of the mounting end is located at the second mounting section; a dimension of the first mounting section in the third direction is larger than a dimension of the second mounting section;

[0019] The first magnetic release component is installed at a position of the first installation section close to the second installation section, and the thermal release component is installed at the second installation section.

[0020] In one of the embodiments, the thermal-magnetic tripping mechanism further includes a mounting shaft, the mounting shaft extending along the third direction and connected to the supporting portion;

[0021] The reset member is a torsion spring, which is sleeved outside the installation shaft, and has a first connection end fixedly connected to at least one of the bracket, the wiring member and the first magnetic release member, and a second connection end connected to or against the second magnetic release member.

[0022] A circuit breaker, comprising an operating mechanism, a traction rod, a moving contact mechanism, a static contact mechanism and the above-mentioned thermal magnetic tripping mechanism;

[0023] The traction rod is arranged in cooperation with the operating mechanism, the first striking end or the second striking end can strike the traction rod, and the traction rod causes the moving contact of the moving contact mechanism to move and separate relative to the static contact of the static contact mechanism through the operating mechanism.

[0024] The above-mentioned thermal-magnetic tripping mechanism and circuit breaker, because the first magnetic tripping member, the bracket, the second magnetic tripping member, the thermal tripping member and the bracket are all centrally installed at the mounting end of the wiring member, the various structures of the thermal-magnetic tripping mechanism are installed compactly and reasonably, which can reduce the space occupied by the thermal-magnetic tripping mechanism, thereby reducing the volume of the circuit breaker, and meeting the demand for miniaturization of the circuit breaker while ensuring performance requirements.

[0025] In one embodiment, the static contact mechanism further comprises an arc extinguishing grid plate and an exhaust plate, wherein the exhaust plate is attached to the arc extinguishing grid plate; both ends of the arc extinguishing grid plate and the exhaust plate are plugged into the exhaust channel of the base of the circuit breaker;

[0026] The exhaust plate is provided with cutting slits, and the portion of the exhaust plate located between the two cutting slits can be bent away from the arc extinguishing grid plate to be used for exhausting arc gas in the circuit breaker.

[0027] In one embodiment, the moving contact mechanism includes a contact support, a clamping member and an elastic member, the moving contact includes a plurality of moving contact pieces; the clamping member clamps and fixes the moving contact, the moving contact is connected to the contact support, and the elastic member is arranged between the contact support and the moving contact; the contact support can drive the clamping member, the moving contact and the elastic member to rotate relative to the base of the circuit breaker, so that the moving contact contacts or separates from the static contact;

[0028] When the moving contact contacts the stationary contact, the elastic member is elastically deformed, so that the moving contact is in close contact with the stationary contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 An exploded diagram of a circuit breaker provided in one embodiment of the present application;

[0030] Figure 2 for Figure 1 A partial structural diagram of a circuit breaker shown in;

[0031] Figure 3 for Figure 1 An isometric view of the thermal-magnetic trip mechanism of the circuit breaker shown in ;

[0032] Figure 4 for Figure 3 An axonometric view of another perspective of the thermal magnetic trip mechanism shown in ;

[0033] Figure 5 for Figure 3 An axonometric view of the thermal magnetic trip mechanism shown in another perspective;

[0034] Figure 6 for Figure 1Another partial structural diagram of the circuit breaker shown in;

[0035] Figure 7 for Figure 6 A partial exploded view of the structure shown in;

[0036] Figure 8 FIG. 6 is a structural diagram from another perspective of the structure shown in FIG.

[0037] Description of reference numerals:

[0038] 100, circuit breaker; 10, thermal magnetic tripping mechanism; 11, wiring member; 111, mounting end; 112, first mounting section; 113, second mounting section; 12, first magnetic tripping member; 121, first protruding ear; 13, bracket; 131, supporting portion; 132, second protruding ear; 14, second magnetic tripping member; 141, suction portion; 142, first striking end; 1421, first bending portion; 15, reset member; 16, thermal tripping member; 16 1. Second striking end; 1611. Second bending portion; 17. Mounting shaft; 20. Moving contact mechanism; 21. Moving contact; 22. Contact support; 23. Clamping member; 24. Elastic member; 30. Stationary contact mechanism; 31. Stationary contact; 32. Arc extinguishing chamber; 33. Arc extinguishing cover; 331. Arc extinguishing hole; 34. Arc extinguishing grid; 35. Exhaust plate; 351. Cutting seam; 40. Operating mechanism; 71. Drawbar; 50. Mounting member; 60. Base. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0045] See also Figure 1 and Figure 2An embodiment of the present application provides a circuit breaker 100, including a thermal magnetic tripping mechanism 10, a moving contact mechanism 20, a stationary contact mechanism 30, an operating mechanism 40 and a traction rod 71. The operating mechanism 40 is connected to the moving contact mechanism 20, and the traction rod 71 is arranged in cooperation with the operating mechanism 40. The traction rod 71 can pull the moving contact mechanism 20 through the operating mechanism 40 so that its moving contact 21 is separated from the stationary contact 31 of the stationary contact mechanism 30. When the moving contact 21 is in contact with the stationary contact 31, the circuit breaker 100 is in a closed state, and when the moving contact 21 is separated from the stationary contact 31, the circuit breaker 100 is in an open state. When the circuit breaker 100 is short-circuited or overloaded, the thermal magnetic tripping mechanism 10 can drive the operating mechanism 40 to move through the traction rod 71, causing the moving contact 21 to separate from the stationary contact 31 and cut off the circuit.

[0046] See also Figure 3-Figure 5 The thermal magnetic tripping mechanism 10 includes a wiring member 11, a first magnetic tripping member 12, a bracket 13, a second magnetic tripping member 14 and a reset member 15. The wiring member 11 can be connected to an external power source to be energized. Specifically, the static contact 31 serves as the input end of the circuit breaker 100, and the wiring member 11 serves as the output end of the circuit breaker 100. The first magnetic tripping member 12 and the bracket 13 are both mounted on the wiring member 11, and the second magnetic tripping member 14 is movably mounted on the bracket 13. When the circuit breaker 100 is short-circuited, the magnetic attraction force generated between the first magnetic tripping member 12 and the second magnetic tripping member 14 overcomes the elastic force of the reset member 15, causing the second magnetic tripping member 14 to move relative to the bracket 13 and engage with the first magnetic tripping member 12. At this time, the second magnetic tripping member 14 will hit the traction rod 71, and the traction rod 71 triggers the operation mechanism 40 to move, and the operation mechanism 40 drives the moving contact 21 to move, so that the moving contact 21 is separated from the static contact 31 and the circuit is cut off. The reset member 15 is used to reset the second magnetic release member 14 so that the second magnetic release member 14 is separated from the first magnetic release member 12 .

[0047] The thermal magnetic tripping mechanism 10 further includes a thermal tripping member 16, which is mounted on the terminal 11. When the circuit breaker 100 is overloaded, the thermal tripping member 16 heats up and deforms. When the deformation reaches a certain degree, the thermal tripping member 16 strikes the traction rod 71, and the traction rod 71 triggers the operation mechanism 40 to operate. The operation mechanism 40 drives the moving contact 21 to operate, so that the moving contact 21 is separated from the static contact 31 to cut off the circuit.

[0048] In the conventional technology, the various structures of the thermal-magnetic tripping mechanism 10 are not installed compactly enough, and the thermal-magnetic tripping mechanism 10 occupies a large space, which results in a large volume of the entire circuit breaker 100 .

[0049] Further, in order to solve the above problems, in the present application, the terminal 11 extends along the first direction, and one end of the terminal 11 in the first direction is the mounting end 111. The first magnetic release member 12 and the bracket 13 are both installed on the mounting end 111, and the bracket 13 has a support portion 131 protruding from the mounting end 111 in the second direction. That is. The support portion 131 protrudes from the end surface of the terminal 11 in the second direction. One end of the second magnetic release member 14 is rotatably connected to the support portion 131 along an axis, and the axis extends along the third direction. And one end of the second magnetic release member 14 rotatably connected to the support portion 131 forms an attraction portion 141, and when the circuit breaker 100 is short-circuited, the attraction portion 141 can be attracted with the first magnetic release member 12. The second magnetic release member 14 extends away from the mounting end 111 in the second direction to form a first striking end 142, and when the circuit breaker 100 is short-circuited, the first striking end 142 strikes the traction rod 71.

[0050] The first direction, the second direction and the third direction intersect each other. Specifically, the first direction, the second direction and the third direction are perpendicular to each other. In some specific embodiments, the circuit breaker 100 is a rectangular parallelepiped structure, in which case the first direction is the length direction of the circuit breaker 100, the second direction is the height direction of the circuit breaker 100, and the third direction is the width direction of the circuit breaker 100. Figure 1 and Figure 3 , the X direction is the first direction, the Z direction is the second direction, and the Y direction is the third direction.

[0051] The reset member 15 is disposed at the mounting end 111 of the terminal 11 and is located between the support portion 131 and the second magnetic release member 14 for resetting the second magnetic release member 14. It is understandable that in some other embodiments, the reset member 15 can also be located between the first magnetic release member 12 and the second magnetic release member 14 for resetting the second magnetic release member 14. In some further embodiments, the reset member 15 can also be located between the terminal 11 and the second magnetic release member 14 for resetting the second magnetic release member 14. That is, there is no limitation on which component the reset member 15 is specifically connected to, as long as it can store energy for resetting the second magnetic release member 14 when the first magnetic release member 12 and the second magnetic release member 14 are attracted.

[0052] One end of the thermal release member 16 is connected to the mounting end 111, and the other end extends away from the mounting end 111 along the second direction to form a second striking end 161. When the circuit breaker 100 is overloaded, the second striking end 161 strikes the traction rod 71.

[0053] Optionally, the first magnetic release component 12 is a magnetic yoke, the second magnetic release component 14 is an armature, and the thermal release component 16 is a bimetallic strip.

[0054] Because the first magnetic tripping member 12, the bracket 13, the second magnetic tripping member 14, the reset member 15, the thermal tripping member 16 and the bracket 13 are all centrally installed at the mounting end 111 of the terminal 11, the various structures of the thermal-magnetic tripping mechanism 10 are installed compactly and reasonably, which can reduce the space occupied by the thermal-magnetic tripping mechanism 10, thereby reducing the volume of the circuit breaker 100, and meeting the miniaturization requirements of the circuit breaker 100 while ensuring the performance requirements.

[0055] Optionally, the first striking end 142 and the second striking end 161 are spaced apart in the first direction. Thus, when neither the first striking end 142 nor the second striking end 161 strikes the traction rod 71, no interference occurs between the two. Meanwhile, the first striking end 142 and the second striking end 161 are spaced apart in the third direction. Thus, when either the first striking end 141 or the second striking end 161 strikes the traction rod 71, the other does not interfere with the other striking the traction rod 71.

[0056] Furthermore, the first striking end 142 has a first curved portion 1421 curved toward the traction rod 71, and the second striking end 161 has a second curved portion 1611 curved toward the traction rod 71. Since both the first curved portion 1421 and the second curved portion 161 are curved toward the traction rod 71, it is convenient for the first striking end 141 to strike the traction rod 71 through the first curved portion 1421, and it is convenient for the second striking end 161 to strike the traction rod 71 through the second curved portion 1611.

[0057] In some embodiments, see Figure 5 , the first magnetic release member 12 is U-shaped. The first magnetic release member 12 is fixedly connected to the outside of the mounting end 111 from one side along the second direction, and two first protruding ears 121 are formed at one end of the first magnetic release member 12 in the second direction. The two first protruding ears 121 and the support portion 131 are protruded on the same side of the mounting end 111, and the two first protruding ears 121 are used to engage with the second magnetic release member 14. In this way, the first magnetic release member 12 and the second magnetic release member 14 are easily engaged.

[0058] Further reading Figure 5 , the bracket 13 is U-shaped. The bracket 13 is fixedly connected to the outside of the mounting end 111 from one side along the second direction, and the two second protruding ears 132 of the bracket 13 protrude from the other side of the mounting end 111 in the second direction to form a supporting portion 131. The two ends of the second magnetic release member 14 in the third direction are rotatably connected to the two second protruding ears 132 respectively. Specifically, the first magnetic release member 12 is clamped between the bracket 13 and the terminal 11, and the fixing member is passed through the bracket 13, the first magnetic release member 12 and the terminal 11, so that the first magnetic release member 12, the bracket 13 and the terminal 11 are fixedly connected. In this way, the assembly of the first magnetic release member 12, the bracket 13 and the terminal 11 is facilitated.

[0059] It is understandable that in some other embodiments, the shapes of the first magnetic release member 12 and the bracket 13 are not limited, and the manner in which the first magnetic release member 12 and the bracket 13 are assembled with the terminal member 11 is also not limited.

[0060] Optionally, continue to Figure 3 The mounting end 111 includes a first mounting section 112 and a second mounting section 113 that are connected to each other, and the end face of the mounting end 111 is located at the second mounting section 113. The size of the first mounting section 112 in the third direction is larger than the size of the second mounting section 113 in the third direction, so that a step is formed between the first mounting section 112 and the second mounting section 113. The first magnetic release component 12 is installed at a position of the first mounting section 112 close to the second mounting section 113, and the thermal release component 16 is installed at the second mounting section 113. In this way, a step is formed between the first mounting section 112 and the second mounting section 113, which can separate the first magnetic release component 12 and the thermal release component 16 to prevent mutual influence between the two.

[0061] Continue reading Figure 4 The thermal magnetic release mechanism 10 also includes a mounting shaft 17, which extends along the third direction and is connected to the two second protruding ears 132. The reset member 15 is a torsion spring, which is sleeved outside the mounting shaft 17, and the first connecting end of the torsion spring is fixedly connected to the bracket 13 and / or the terminal 11 and / or the first magnetic release member 12, that is, the first connecting end of the torsion spring is connected to at least one of the bracket 13, the terminal 11 and the first magnetic release member 12, and the second connecting end of the torsion spring is connected to or abuts against the second magnetic release member 14. In this way, the reset member 15 is integrated into the mounting end 111 of the terminal 11 through the mounting shaft 17, which further makes the layout of each structure compact and reduces the occupied space.

[0062] In some embodiments, the circuit breaker 100 includes a plurality of thermal magnetic tripping mechanisms 10, which are arranged in sequence in the third direction, and each thermal magnetic tripping mechanism 10 is provided with a corresponding static contact mechanism 30 and a moving contact mechanism 20. All the moving contact mechanisms 20 are connected to the operating mechanism 40, and the moving contacts 21 of all the moving contact mechanisms 20 can contact or separate with the corresponding static contacts at the same time under the action of the operating mechanism 40. In this way, the plurality of thermal magnetic tripping mechanisms 10 cooperate with each other, and the reliability is high.

[0063] Furthermore, in the first direction, the moving contact mechanism 20 is arranged between the corresponding thermal magnetic tripping mechanism 10 and the static contact mechanism 30, and the moving contact 21 can contact or separate with the static contact 31 under the action of the operating mechanism 40. Such arrangement makes the circuit breaker 100 compact and reduces the volume.

[0064] In some embodiments, see Figure 6 and Figure 7 The moving contact mechanism 20 also includes a contact support 22, a clamping member 23 and an elastic member 24. The clamping member 23 clamps and fixes multiple moving contact pieces, and the moving contact 21 is connected to the contact support 22. The elastic member 24 is arranged between the contact support 22 and the moving contact 21. Optionally, the contact support members 22 of multiple moving contact mechanisms 20 are interconnected and can rotate relative to the base 60 of the circuit breaker 100 to drive the moving contact 21 formed by multiple moving contact pieces to move relative to the static contact 31. The contact support member 22 is mounted on the base 60 through the mounting member 50, and the contact support member 22 is rotatably mounted on the mounting member 50. When the moving contact 21 contacts the static contact 31, the elastic member 24 elastically deforms so that the two are in close contact. The elastic member wherein the operating mechanism 40 is connected to the contact support member 22.

[0065] In some embodiments, see Figure 6 and Figure 7 The static contact mechanism 30 further includes an arc extinguishing chamber 32 and an arc extinguishing shield 33. The arc extinguishing chamber 32, the arc extinguishing shield 33 and the moving contact 21 are all located on the same side of the static contact 31 in the second direction. The arc extinguishing shield 33 at least partially extends into the arc extinguishing chamber 32. The arc extinguishing shield 33 has an arc extinguishing hole 331 opposite to the static contact 31. The moving contact 21 extends into the arc extinguishing shield 33 and passes through the arc extinguishing hole 331 to contact the static contact 31. The arc extinguishing shield 33 cooperates with the arc extinguishing chamber 32 to extinguish the arc in the circuit breaker 100. At the same time, the arc extinguishing chamber 32, the arc extinguishing shield 33 and the static contact 31 are compactly arranged, which reduces the space occupied by the circuit breaker 100.

[0066] For further information, see Figure 8 The static contact mechanism 30 further includes an arc extinguishing grid plate 34 and an exhaust plate 35. The exhaust plate 35 is located at one end of the arc extinguishing chamber 32 away from the arc extinguishing cover 33 in the first direction. The arc extinguishing grid plate 34 is located between the exhaust plate 35 and the arc extinguishing chamber 32, and the exhaust plate 35 is attached to the arc extinguishing grid plate 34. Both ends of the arc extinguishing grid plate 34 and the exhaust plate 35 are inserted into the exhaust channel of the base 60 of the circuit breaker 100. A cutting slit 351 is provided on the exhaust plate 35, and the portion of the exhaust plate 35 located between the two cutting slits 351 can be bent away from the arc extinguishing chamber 32 for the discharge of arc gas in the circuit breaker 100. When hot arc gas is generated inside the circuit breaker 100, the portion of the exhaust plate 35 located between the two cutting slits 351 bends outward, and the gas is discharged from the exhaust plate 35.

[0067] Another embodiment of the present application further provides a thermal-magnetic tripping mechanism 10 included in the above-mentioned circuit breaker 100. Since the above-mentioned circuit breaker 100 has beneficial effects, the thermal-magnetic tripping mechanism 10 has the same beneficial effects, which will not be described in detail herein.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A thermal magnetic tripping mechanism, characterized in that: include: A connecting piece (11), one end of which is longitudinally extended along a first direction to form a mounting end (111); A first magnetic release member (12) and a bracket (13) mounted on the mounting end (111), the bracket (13) having a support portion (131) protruding from the mounting end (111) along a second direction; A second magnetic release member (14), one end of which is rotatably connected to the support portion (131) around an axis extending along the third direction and forms an attraction portion (141) that is attracted to the first magnetic release member (12), and the other end of which extends away from the mounting end (111) along the second direction to form a first striking end (142); A reset member (15) provided at the mounting end (111) and used for resetting the second magnetic release member (14); A thermal release member (16), one end of which is connected to the mounting end (111), and the other end of which extends away from the mounting end (111) along the second direction to form a second striking end (161); The first direction, the second direction and the third direction intersect each other.

2. The thermal magnetic tripping mechanism according to claim 1, characterized in that: The first striking end (142) and the second striking end (161) are arranged at intervals in the first direction and the third direction.

3. The thermal magnetic tripping mechanism according to claim 1, characterized in that: The first magnetic release member (12) is a yoke, and the second magnetic release member (14) is an armature; and / or The thermal release component (16) is a bimetallic strip.

4. The thermal magnetic tripping mechanism according to claim 1, characterized in that: The first magnetic release member (12) is U-shaped; The first magnetic release member (12) is fixedly connected to the outside of the mounting end (111) from one side along the second direction, and two first protruding ears (121) are formed at one end of the first magnetic release member (12) in the second direction, the two first protruding ears (121) and the support portion (131) are protrudingly arranged on the same side of the mounting end (111), and the two first protruding ears (121) are used to be attracted to the second magnetic release member (14).

5. The thermal magnetic tripping mechanism according to any one of claims 1 to 4, characterized in that: The bracket (13) is U-shaped; The bracket (13) is fixedly connected to the outside of the mounting end (111) from one side along the second direction, and two second protruding ears (132) of the bracket (13) protrude from the other side of the mounting end (111) in the second direction to form the supporting portion (131), and the second magnetic release member (14) is rotatably connected to the two second protruding ears (132) at both ends in the third direction.

6. The thermal magnetic tripping mechanism according to any one of claims 1 to 4, characterized in that: The mounting end (111) comprises a first mounting section (112) and a second mounting section (113) which are connected to each other and arranged in a stepped manner, and an end surface of the mounting end (111) is located on the second mounting section (113); a dimension of the first mounting section (112) in the third direction is greater than a dimension of the second mounting section (113); The first magnetic release component (12) is installed at a position of the first installation section (112) close to the second installation section (113), and the thermal release component (16) is installed at the second installation section (113).

7. The thermal magnetic tripping mechanism according to claim 1, characterized in that: The thermal magnetic tripping mechanism further comprises a mounting shaft (17), wherein the mounting shaft (17) extends along the third direction and is connected to the supporting portion (131); The reset member (15) is a torsion spring, which is sleeved outside the mounting shaft (17), and has a first connection end fixedly connected to at least one of the bracket (13), the wiring member (11) and the first magnetic release member (12), and a second connection end connected to or abutting against the second magnetic release member (14).

8. A circuit breaker, characterized in that: The circuit breaker comprises an operating mechanism (40), a traction rod (71), a moving contact mechanism (20), a stationary contact mechanism (30) and a thermal magnetic tripping mechanism according to any one of claims 1 to 7; The traction rod (71) is arranged in cooperation with the operating mechanism (40); the first striking end (142) or the second striking end (161) is capable of striking the traction rod (71); and the traction rod (71) causes the moving contact (21) of the moving contact mechanism (20) to move relative to the stationary contact (31) of the stationary contact mechanism (30) and separate through the operating mechanism (40).

9. The circuit breaker according to claim 8, characterized in that: The static contact mechanism (30) comprises an arc extinguishing grid plate (34) and an exhaust plate (35), wherein the exhaust plate (35) is attached to the arc extinguishing grid plate (34); both ends of the arc extinguishing grid plate (34) and the exhaust plate (35) are inserted into an exhaust channel of a base (60) of the circuit breaker; The exhaust plate (35) is provided with a cutting slit (351), and the portion of the exhaust plate (35) located between two cutting slits (351) can be bent away from the arc extinguishing grid plate (34) to be used for exhausting arc gas in the circuit breaker.

10. The circuit breaker according to claim 8, characterized in that The moving contact mechanism (20) comprises a contact support (22), a clamping member (23) and an elastic member (24); the moving contact (21) comprises a plurality of moving contact sheets; the clamping member (23) clamps and fixes the moving contact (21); the moving contact (21) is connected to the contact support (22); the elastic member (24) is arranged between the contact support (22) and the moving contact (21); the contact support (22) can drive the clamping member (23), the moving contact (21) and the elastic member (24) to rotate relative to the base (60) of the circuit breaker, so that the moving contact (21) is in contact with or separated from the static contact (31); When the moving contact (21) contacts the stationary contact (31), the elastic member (24) is elastically deformed, so that the moving contact (21) and the stationary contact (31) are in close contact.

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