An electromagnetic tripping mechanism for a circuit breaker and a circuit breaker thereof

Abstract

The invention provides an electromagnetic tripping mechanism for a circuit breaker and a circuit breaker thereof. The circuit breaker comprises a shell, an electromagnetic tripping mechanism arranged inside the shell, and a trigger structure for tripping the circuit breaker after being impacted. The electromagnetic tripping mechanism comprises: a coil, which is fixedly arranged relative to the shell, and a solenoid portion of the coil surrounds an action hole whose axis is a first axis; a moving iron core, which comprises a sliding seat and a push rod arranged on the sliding seat; the sliding seat is slidably mounted on a mounting seat of the shell located on one side of the solenoid portion along the first axis, and the push rod passes through the action hole; and a reset elastic member; since the sliding seat of the moving iron core is slidably mounted on one side of the solenoid portion, only the push rod passes through the action hole of the solenoid portion, so the inner diameter of the solenoid portion can be set smaller, thereby reducing the production cost; in addition, compared with the electromagnetic tripping mechanism of the prior art which also needs to set a static iron core, the number of components is reduced, the production cost is further reduced, and the assembly is faster and more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances in power systems, and in particular to an electromagnetic tripping mechanism for a circuit breaker and a circuit breaker thereof. Background Art

[0002] Miniature circuit breakers are protective devices installed in terminal distribution lines, mainly used for overload and short circuit protection of lines and electrical equipment. They are suitable for AC 50 / 60Hz, rated voltage not exceeding 400V, and rated current not exceeding 125A.

[0003] Miniature circuit breakers are generally composed of electromagnetic tripping mechanisms, thermal tripping mechanisms, arc extinguishing mechanisms, operating mechanisms, etc. The electromagnetic tripping mechanism is used to provide short-circuit current protection, and it mainly adopts a solenoid structure, such as Figure 1 and 2 As shown, the electromagnetic tripping mechanism includes: a cylinder 01, having a through inner cavity 011; a moving iron core 02, movably installed at one end of the inner cavity 011; a static iron core 03, fixedly arranged at the other end of the inner cavity 011, and having a through hole in the middle; a push rod 04, one end of which is connected to the moving iron core 02, and the other end passes through the through hole of the static iron core 03; a reset spring 05, which is sleeved on the push rod 04, and one end is fixedly connected to the static iron core 03, and the other end is fixedly connected to the push rod 04; a coil 06, which is arranged on the outside of the cylinder 01; when a short circuit fault occurs, the current flowing through the coil 06 increases instantly, and the coil 06 generates a large electromagnetic force, which drives the moving iron core 02 to move in the direction close to the static iron core 03, drives the push rod 04 to activate the operating mechanism, thereby driving the moving and static contacts to disconnect.

[0004] The defects of the above technical solution are: the existing assembly method is mainly manual assembly, and due to the small size of each component, the assembly is difficult, and the number of components is large, which makes the assembly process cumbersome and increases the production cost; in addition, since the coil is sleeved on the outside of the cylinder and the cylinder acts on the push rod, the inner diameter specification of the coil needs to be set larger, further increasing the production cost. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical defects in the prior art that the electromagnetic tripping mechanism has a large number of parts, complicated assembly process, large inner diameter specification of the coil and high production cost, so as to provide an electromagnetic tripping mechanism for a circuit breaker with a small number of parts, simple assembly and low production cost.

[0006] The present invention also provides a circuit breaker having the electromagnetic tripping mechanism.

[0007] To this end, the present invention provides an electromagnetic tripping mechanism for a circuit breaker, the circuit breaker comprising a housing, the electromagnetic tripping mechanism arranged inside the housing, and a triggering structure for tripping the circuit breaker after being impacted.

[0008] The electromagnetic tripping mechanism comprises:

[0009] The coil is fixedly arranged relative to the housing, and its spiral tube portion surrounds an action hole with an axis as the first axis;

[0010] The moving iron core comprises a sliding seat and a push rod arranged on the sliding seat; the sliding seat is slidably mounted on the mounting seat of the housing located on one side of the solenoid portion along the first axis, and the push rod passes through the action hole; driven by the electromagnetic force of the coil, the push rod slides along the first axis to a trigger position that hits the trigger structure;

[0011] The resetting elastic member is arranged between the slide seat and the mounting seat, and is used to drive the moving iron core to move from the trigger position to the initial position in a direction away from the trigger structure.

[0012] As a preferred solution, the slide seat is slidably connected to the mounting seat via a slide rail structure; the slide rail structure includes a guide rail provided on one side of the mounting seat and the slide seat, and a guide groove provided on the other side to cooperate with the guide rail.

[0013] As a preferred solution, the mounting seat is a structure extending along the first axis, and the sliding seat is a structure extending along the first axis and buckled on a side surface of the mounting seat.

[0014] As a preferred solution, the housing is provided with a first limiting block for limiting the sliding seat on the mounting seat.

[0015] As a preferred embodiment, the reset elastic member is a coil spring, the mounting seat is provided with a mounting groove for accommodating the reset elastic member toward the sliding seat, the sliding seat includes a mounting plate extending toward the mounting groove, and both ends of the reset elastic member are respectively against the side wall of the mounting groove and the mounting plate.

[0016] As a preferred embodiment, the mounting seat has a top surface and a bottom surface which are spaced apart in height by a set distance and extend horizontally, the mounting groove is arranged between the top surface and the bottom surface, and the opening is facing the horizontal direction; the sliding seat is a U-shaped structure, including a first side wall and a second side wall arranged corresponding to the top surface and the bottom surface, and an intermediate plate connecting the first side wall and the second side wall; the mounting plate and the push rod are arranged on the intermediate plate.

[0017] As a preferred solution, the slide seat and the push rod are an integral structure.

[0018] A circuit breaker comprises a first shell and a second shell which are fastened together to form the shell, a contact mechanism arranged in the shell, an operating mechanism for controlling the contact mechanism and the above-mentioned electromagnetic tripping mechanism.

[0019] As a preferred solution, the operating mechanism includes:

[0020] A contact bracket is rotatably mounted on the first housing through a bracket rotating shaft, and a blocking structure and a moving contact are respectively provided at the upper and lower ends;

[0021] A lock buckle, rotatably mounted on the contact bracket via the bracket rotation axis, the lock buckle comprising a first end arm;

[0022] A locking elastic member, one end of which is connected to the contact bracket and the other end of which is connected to the locking member; under the action of the locking elastic member, the first end arm and the blocking structure are opposite to form a first bracket groove and a second bracket groove;

[0023] A handle connecting rod, one end of which is connected to the handle, and the other end of which is movably connected to the first bracket groove or the second bracket groove; when the handle connecting rod slides in the first bracket groove, it can push the contact bracket and the lock buckle to rotate;

[0024] The disconnecting elastic member has one end connected to the first housing and the other end connected to the contact bracket. Under the action of the disconnecting elastic member, the contact bracket is in an initial position.

[0025] As a preferred solution, the first protrusion in the middle of the first end arm is opposite to the blocking structure to form a first notch, and the second protrusion at the end of the first end arm is opposite to the blocking structure to form a second notch for preventing the handle connecting rod from sliding out of the groove of the second bracket;

[0026] In the open state, one end of the handle connecting rod is located in the first bracket groove, and its width is greater than the width of the first notch.

[0027] As a preferred solution, the lock further includes a second end arm opposite to the push rod of the electromagnetic release mechanism, the push rod hits the second end arm to drive the lock to rotate around the axis, and the second end arm is the trigger structure.

[0028] As a preferred embodiment, the lock also includes a third end arm opposite to the bimetallic strip to achieve overload protection; the end of the third end arm is provided with a second driving block vertically arranged with the third end arm for cooperating with the bimetallic strip for driving; the end of the third end arm corresponding to the bimetallic strip is provided with an indicator portion for indicating the reference adjustment position of the bimetallic strip.

[0029] As a preferred solution, the indicating portion is in the shape of comb teeth.

[0030] As a preferred embodiment, the contact bracket is provided with a positioning column for installing the moving contact, and the disconnecting elastic member is sleeved on the positioning column, having a first section fixedly connected to the moving contact, and a second section cooperating and abutting with the limiting structure of the contact bracket, and an end of the second section extends outward from the contact bracket and abuts against the inner wall of the first shell.

[0031] As a preferred solution, the limiting structure is a second limiting block in an inverted L shape provided on the contact bracket, and the second limiting block and the contact bracket are opposite to form a slot for the second section of the breaking elastic member to penetrate.

[0032] The technical solution of the present invention has the following advantages:

[0033] 1. The electromagnetic tripping mechanism for a circuit breaker of the present invention comprises a coil, a moving iron core and a reset elastic member, wherein the solenoid portion of the coil surrounds an action hole whose axis is a first axis; the moving iron core comprises a sliding seat and a push rod arranged on the sliding seat; the sliding seat is slidably mounted on a mounting seat of a housing located on one side of the solenoid portion along the first axis, and the push rod passes through the action hole; under the direct drive of the electromagnetic force of the coil, the push rod slides along the first axis to a trigger position of a collision trigger structure; since the sliding seat of the moving iron core is slidably mounted on one side of the solenoid portion, only the push rod passes through the action hole of the solenoid portion, and the cylinder in the prior art is omitted, the inner diameter of the solenoid portion can be set smaller, thereby reducing the production cost; in addition, compared with the electromagnetic tripping mechanism of the prior art which also requires the provision of a static iron core, the number of components is reduced, the production cost is further reduced, and the assembly is quicker and more convenient.

[0034] 2. In the electromagnetic tripping mechanism for the circuit breaker of the present invention, the mounting seat is a structure extending along the first axis, and the sliding seat is a structure extending along the first axis and buckled on the side of the mounting seat. The sliding seat is assembled with the mounting seat by buckling, which has a simple structure and is easy to disassemble, further improving the disassembly and assembly efficiency.

[0035] 3. In the electromagnetic tripping mechanism for a circuit breaker of the present invention, a mounting seat is provided with a mounting groove for accommodating a reset elastic member toward the slide seat, the slide seat includes a mounting plate extending toward the mounting groove, and two ends of the reset elastic member are respectively against the side walls of the mounting groove and the mounting plate; during assembly, after the slide seat is buckled onto the mounting seat, the mounting plate enters the mounting groove and is driven to cooperate with the reset elastic member, and the mounting plate can only slide in the mounting groove, thereby limiting the sliding position of the slide seat. The above structure is simple to set and easy to disassemble and assemble.

[0036] 4. In the electromagnetic tripping mechanism for the circuit breaker of the present invention, the slide seat and the push rod are an integrated structure, which further reduces the number of parts and improves the disassembly and assembly efficiency.

[0037] 5. In the circuit breaker of the present invention, the lock also includes a third end arm opposite to the bimetallic strip to achieve overload protection; the end of the third end arm is provided with a second driving block vertically arranged with the third end arm for cooperating with the bimetallic strip for driving; the end of the third end arm corresponding to the bimetallic strip is provided with an indicating portion for indicating the reference adjustment position of the bimetallic strip; since the third end arm is formed on the lock, compared with the lock of the prior art which requires the bimetallic strip to cooperate with the bimetallic strip through a bimetallic pull rod, the number of parts is reduced, and the problem of the bimetallic pull rod being easily installed in the wrong position is avoided, thereby improving the assembly efficiency; and by arranging the indicating portion on the third end arm, the debugging personnel can quickly adjust the installation position of the bimetallic strip by referring to the indicating portion, thereby improving the debugging production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the prior art or the specific embodiments of the present invention, the following briefly introduces the drawings used in the description of the prior art or the specific embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 It is a structural schematic diagram of the electromagnetic tripping mechanism of a small and medium-sized circuit breaker in the prior art.

[0040] Figure 2 yes Figure 1 Cross-sectional view of the electromagnetic tripping mechanism.

[0041] Figure 3 It is a schematic diagram of the structure of the circuit breaker after the second housing is removed in this embodiment.

[0042] Figure 4 yes Figure 3 Schematic diagram of the structure of the moving iron core, coil and reset elastic member.

[0043] Figure 5 yes Figure 3 Cross-section view along the AA direction.

[0044] Figure 6 It is a structural diagram of a circuit breaker.

[0045] Figure 7 yes Figure 6 A cross-sectional view of a circuit breaker.

[0046] Figure 8 It is a structural schematic diagram of a circuit breaker operating mechanism installed on a first housing.

[0047] Fig. 9 It is a structural diagram of the circuit breaker operating mechanism.

[0048] Fig.10 yes Fig. 9Schematic diagram of the structure after removing the handle and handle connecting rod.

[0049] Fig.11 It is a schematic diagram of the exploded structure of the contact bracket and the lock.

[0050] Fig.12 yes Fig.10 Schematic diagram of another structure rotated at a certain angle.

[0051] Fig.13 It is a schematic diagram of the exploded structure of the contact bracket, the moving contact, and the breaking elastic member.

[0052] Reference numerals: 01, cylinder; 011, inner cavity; 02, moving iron core; 03, stationary iron core; 04, push rod; 05, return spring; 06, coil;

[0053] 1. First housing; 11. Mounting seat; 12. Coil; 13. Mounting slot; 120. Screw tube; 2. Second housing; 21. First stop block; 3. Moving iron core; 31. Sliding seat; 310. Middle plate; 311. First side wall; 312. Second side wall; 32. Push rod; 33. Reset elastic member; 34. Mounting plate; 4. Contact bracket; 40. Disconnecting elastic member; 401. First section; 402. Second section; 41. Moving contact Head; 42, blocking structure; 43, first bracket groove; 44, second bracket groove; 45, bracket rotation axis; 46, positioning column; 47, second limit block; 5, lock; 50, lock elastic member; 51, first end arm; 511, first protrusion; 512, second protrusion; 52, second end arm; 53, third end arm; 531, second drive block; 532, indication part; 6, handle; 61, handle connecting rod; 7, bimetallic strip. DETAILED DESCRIPTION

[0054] The technical solution of the present invention is described below in conjunction with the drawings of the specification. Obviously, the following embodiments are not all embodiments of the present invention. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without making other creative work are within the protection scope of the present invention.

[0055] It should be noted that, in the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] Example 1

[0057] This embodiment provides an electromagnetic tripping mechanism for a circuit breaker, such as Figure 3 and 4As shown, the circuit breaker includes a shell, an electromagnetic tripping mechanism arranged inside the shell, and a triggering structure that trips the circuit breaker after being hit, and the electromagnetic tripping mechanism includes: a coil 12, which is fixedly arranged relative to the shell, including a solenoid portion 120 and flat plate portions arranged at both ends of the solenoid portion 120, wherein the solenoid portion 120 surrounds an action hole whose axis is the first axis; a moving iron core 3, including a slide seat 31 and a push rod 32 arranged on the slide seat 31; the slide seat 31 is slidably installed on the mounting seat 11 of the shell located on one side of the solenoid portion 120 along the first axis, and the push rod 32 passes through the action hole; driven by the electromagnetic force of the coil 12, the push rod 32 slides along the first axis to a triggering position that hits the triggering structure; a reset elastic member 33 is arranged between the slide seat 31 and the mounting seat 11, and is used to drive the moving iron core 3 to move from the triggering position to the initial position in a direction away from the triggering structure. In the electromagnetic tripping mechanism of this embodiment, since the sliding seat 31 of the moving iron core 3 is slidably mounted on one side of the solenoid portion 120, and only the push rod 32 passes through the action hole of the solenoid portion 120, the inner diameter of the solenoid portion 120 can be set smaller, thereby reducing the production cost; in addition, compared with the electromagnetic tripping mechanism of the prior art which also requires the installation of a static iron core, the number of parts is reduced, the production cost is further reduced, and the assembly is faster and more convenient. In this embodiment, the mounting seat 11 is integrally formed on the housing, and can also be detachably fixedly mounted on the housing.

[0058] In this embodiment, the slide seat 31 is slidably connected to the mounting seat 11 via a slide rail structure; the slide rail structure includes a guide rail provided on one side of the mounting seat 11 and the slide seat 31, and a guide groove provided on the other side to cooperate with the guide rail.

[0059] like Figure 5 As shown, the mounting seat 11 is a structure extending along the first axis, and the slide seat 31 is a structure extending along the first axis and buckled on the side of the mounting seat 11. The slide seat 31 is assembled with the mounting seat 11 by buckling, which has a simple structure and is easy to disassemble, further improving the disassembly and assembly efficiency.

[0060] As a convertible embodiment, the slide 31 can be slid into and assembled with the mounting seat 11 from one side of the mounting seat 11 along the first axis direction, and a limiting structure for limiting the movement of the slide 31 between the initial position and the trigger position is provided on the housing.

[0061] In this embodiment, Figure 7 As shown, the shell is provided with a first limit block 21 to limit the slide seat 31 on the mounting seat 11. Specifically, the mounting seat 11 is arranged on the first shell 1, and the first limit block 21 is vertically arranged on the second shell 2 opposite to the first shell 1 and extends along the first axis direction.

[0062] The reset elastic member 33 is a coil spring. The mounting seat 11 is provided with a mounting groove 13 for accommodating the reset elastic member 33 toward the slide seat 31. The slide seat 31 includes a mounting plate 34 extending toward the mounting groove 13. The two ends of the reset elastic member 33 are respectively against the side walls of the mounting groove 13 and the mounting plate 34; the mounting plate 34 is provided with a protrusion for fixing the coil spring. During assembly, one end of the coil spring is first fixed to the mounting plate 34, and then the slide seat 31 is buckled on the mounting seat 11. The installation is quick and convenient.

[0063] Specifically, Figure 7 and 8 As shown, the mounting seat 11 has a top surface and a bottom surface that are spaced a set distance in height and extend horizontally, the mounting groove 13 is arranged between the top surface and the bottom surface, and the opening is facing the horizontal direction; the sliding seat 31 is a U-shaped structure, including a first side wall 311 and a second side wall 312 arranged corresponding to the top surface and the bottom surface, and an intermediate plate 310 connecting the first side wall 311 and the second side wall 312; the mounting plate 34 and the push rod 32 are arranged on the intermediate plate 310.

[0064] As a convertible embodiment, the U-shaped slide 31 and mounting seat 11 can be replaced by a cylindrical slide 31 and a cylindrical mounting seat 11, or replaced by a convex slide 31 and a convex mounting seat 11. The present invention does not specifically limit the shapes of the slide 31 and the mounting seat 11.

[0065] In this embodiment, the slide seat 31 and the push rod 32 are an integrated structure, which further reduces the number of parts and improves the efficiency of assembly and disassembly.

[0066] Example 2

[0067] This embodiment provides a circuit breaker, including a first shell 1 and a second shell 2 that are snapped together to form a shell, a contact mechanism arranged in the shell, an operating mechanism for controlling the contact mechanism, and the electromagnetic tripping mechanism as described in Embodiment 1.

[0068] In this embodiment, Figure 8 and 9As shown, the operating mechanism includes: a contact bracket 4, which is rotatably mounted on the first housing 1 through a bracket rotating shaft 45, and a blocking structure 42 and a moving contact 41 are respectively provided at the upper and lower ends; a lock buckle 5, which is rotatably mounted on the contact bracket 4 through the bracket rotating shaft 45, and the lock buckle 5 includes a first end arm 51; a lock buckle elastic member 50, one end of which is connected to the contact bracket 4, and the other end is connected to the lock buckle 5; under the action of the lock buckle elastic member 50, the first end arm 51 and the blocking structure 42 are relatively formed to form a first bracket groove 43 and a second bracket groove 44; a handle connecting rod 61, one end of which is connected to the handle 6, and the other end is movably connected to the first bracket groove 43 or the second bracket groove 44; when the handle connecting rod 61 slides in the first bracket groove 43, it can push the contact bracket 4 and the lock buckle 5 to rotate; a disconnecting elastic member 40, one end of which is connected to the first housing 1, and the other end is connected to the contact bracket 4, and under the action of the disconnecting elastic member 40, the contact bracket 4 is in an initial position.

[0069] like Fig.10 As shown, the first protrusion 511 in the middle of the first end arm 51 forms a first notch relative to the blocking structure 42, and the second protrusion 512 at the end of the first end arm 51 forms a second notch relative to the blocking structure 42 for preventing the handle link 61 from sliding out of the second bracket groove 44; when the gate is in the open state, one end of the handle link 61 is located in the first bracket groove 43, and under the action of the push-up force of the lock elastic member 50, its width is greater than the width of the first notch.

[0070] When the closing operation is performed, the handle link 61 slides from the first bracket groove 43 to the first notch. Due to the clamping effect of the lock elastic member 50, the handle link 61 cannot slide from the first bracket groove 43 over the first notch to enter the second bracket groove 44. The handle link 61 can only push the contact bracket 4 and the lock 5 to rotate clockwise synchronously to close the moving and static contacts. When the opening operation is performed, the lock 5 is driven by the bimetallic strip 7 or the push rod 32 of the electromagnetic tripping mechanism to rotate relative to the contact bracket 4 counterclockwise, so that the opening of the first notch becomes larger. When the opening is larger than the width of one end of the handle link 61, the handle link 61 enters the second bracket groove 44 from the first bracket groove 43. At this time, the operating mechanism is tripped, and the contact bracket 4 returns to its position under the action of the disconnecting elastic member 40, so that the moving and static contacts are separated, and the handle link 61 returns to the first bracket groove 43 driven by the handle 6.

[0071] In this embodiment, the lock buckle 5 also includes a second end arm 52 opposite to the push rod 32 of the electromagnetic tripping mechanism. The push rod 32 hits the second end arm 52 to drive the lock buckle 5 to rotate counterclockwise around the axis. The second end arm 52 is a trigger structure.

[0072] In this embodiment, Fig.11 and 12As shown, the lock catch 5 also includes a third end arm 53 opposite to the bimetallic strip 7 for overload protection; the end of the third end arm 53 is provided with a second driving block 531 arranged perpendicularly to the third end arm 53 for driving in cooperation with the bimetallic strip 7, and the second driving block 531 is cylindrical; the end of the third end arm 53 corresponding to the bimetallic strip 7 is provided with an indicating portion 532 for indicating the reference adjustment position of the bimetallic strip 7. When an overload occurs, the bimetallic strip 7 is deformed, and the lock catch 5 is driven by the second driving block 531 to rotate counterclockwise relative to the contact bracket 4, so that the opening of the first notch becomes larger. When the opening is larger than the width of one end of the handle connecting rod 61, the handle connecting rod 61 enters the second bracket groove 44 from the first bracket groove 43, and the operating mechanism is tripped at this time. The contact bracket 4 returns to its original position under the action of the disconnecting elastic member 40, so that the moving and static contacts are separated, and the handle connecting rod 61 returns to the first bracket groove 43 under the drive of the handle 6.

[0073] In this embodiment, the first end arm 51, the second end arm 52 and the third end arm 53 are integrally formed. Since the third end arm 53 is formed on the lock buckle 5, compared with the lock buckle 5 in the prior art which needs to cooperate with the bimetallic strip through a bimetallic pull rod, the number of parts is reduced, and the problem of the bimetallic pull rod being easily installed in the wrong position is avoided, thereby improving the assembly efficiency; the second drive block 531 is cylindrical, and the mating surface is an arc driving surface when it contacts the bimetallic strip 7, which is not easy to wear the bimetallic strip 7 and extends the service life; and by providing an indication portion 532 on the third end arm 53, the debugging personnel can quickly adjust the installation position of the bimetallic strip 7 by referring to the indication portion 532, thereby improving the debugging production efficiency.

[0074] In this embodiment, the indicator 532 is in the shape of comb teeth, which can accurately indicate the reference position of the bimetallic strip, thereby improving the accuracy of the assembly and adjustment of the bimetallic strip. Furthermore, a digital mark is provided at the position corresponding to each comb tooth of the indicator 532, so that the operator can intuitively understand the reference adjustment position more quickly and conveniently through the digital mark, thereby improving the debugging production efficiency.

[0075] In this embodiment, Fig.12 and 13 As shown, the contact support 4 is provided with a positioning column 46 for installing the moving contact 41, and the disconnecting elastic member 40 is sleeved on the positioning column 46, and has a first section 401 fixedly connected to the moving contact 41, and a second section 402 that cooperates with the limiting structure of the contact support 4 to abut. The end of the first section 401 is buckled on the moving contact 41 by reverse buckling, and the end of the second section 402 extends outward from the contact support 4 and abuts against the inner wall of the first housing 1. When closing, the contact support 4 rotates clockwise to store energy in the disconnecting elastic member 40; when opening, the disconnecting elastic member 40 releases energy to drive the contact support 4 to rotate counterclockwise.

[0076] In this embodiment, the limiting structure is an inverted L-shaped second limiting block 47 disposed on the contact support 4. The second limiting block 47 and the contact support 4 are opposite to each other to form a slot for the second section 402 of the disconnecting elastic member 40 to penetrate.

[0077] The opening and closing process of the circuit breaker in this embodiment is as follows:

[0078] During manual closing operation:

[0079] like Figure 3 As shown, the circuit breaker is in the open state, the operator pushes the handle to rotate counterclockwise, one end of the handle connecting rod 61 slides from the first bracket groove 43 to the first notch, driving the contact bracket 4 and the lock 5 to rotate clockwise synchronously, so that the moving and static contacts are in contact and connected.

[0080] When a short circuit occurs:

[0081] The moving iron core 3 is moved under the electromagnetic force of the coil 12. Figure 3 The push rod 32 slides in the middle right direction, passes through the action hole of the screw tube part 120 and hits the second end arm 52, and the second end arm 52 drives the lock buckle 5 to rotate counterclockwise relative to the contact bracket 4. The first notch becomes larger, and the handle connecting rod 61 moves from the first bracket groove 43 to the second bracket groove 44. The contact bracket 4 rotates counterclockwise under the action of the disconnecting elastic member 40, driving the moving and static contacts to separate and disconnect, and the handle connecting rod 61 returns to the first bracket groove 43 driven by the handle 6.

[0082] When an overload fault occurs:

[0083] The bimetallic strip 7 is deformed to the right, and the second driving block 531 of the third end arm 53 drives the lock catch 5 to rotate counterclockwise relative to the contact bracket 4, so that the opening of the first slot becomes larger. When the opening is larger than the width of one end of the handle connecting rod 61, the handle connecting rod 61 enters the second bracket groove 44 from the first bracket groove 43. At this time, the operating mechanism is disengaged, and the contact bracket 4 returns to its original position under the action of the disconnecting elastic member 40, so that the moving and static contacts are separated, and the handle connecting rod 61 returns to the first bracket groove 43 driven by the handle 6.

[0084] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An electromagnetic tripping mechanism for a circuit breaker, the circuit breaker comprising a housing, the electromagnetic tripping mechanism disposed inside the housing, and a triggering structure for tripping the circuit breaker after being impacted, characterized in that: The electromagnetic tripping mechanism comprises: The coil (12) is fixedly arranged relative to the housing, and its spiral tube portion (120) surrounds an action hole whose axis is the first axis; The moving iron core (3) comprises a sliding seat (31) and a push rod (32) arranged on the sliding seat (31); the sliding seat (31) is slidably mounted on a mounting seat (11) of the housing located on one side of the solenoid portion (120) along the first axis, and the push rod (32) passes through the action hole; driven by the electromagnetic force of the coil (12), the push rod (32) slides along the first axis to a trigger position where it strikes the trigger structure; A reset elastic member (33) is arranged between the slide seat (31) and the mounting seat (11), and is used to drive the moving iron core (3) to move from the trigger position to an initial position in a direction away from the trigger structure; The housing is provided with a first limiting block (21) for limiting the sliding seat (31) on the mounting seat (11); The reset elastic member (33) is a coil spring. The mounting seat (11) is provided with a mounting groove (13) for accommodating the reset elastic member (33) toward the sliding seat (31). The sliding seat (31) includes a mounting plate (34) extending toward the mounting groove (13). Two ends of the reset elastic member (33) respectively abut against the side wall of the mounting groove (13) and the mounting plate (34).

2. The electromagnetic tripping mechanism for a circuit breaker according to claim 1, characterized in that: The slide seat (31) is slidably connected to the mounting seat (11) via a slide rail structure; the slide rail structure comprises a guide rail provided on one side of the mounting seat (11) and the slide seat (31), and a guide groove provided on the other side and cooperating with the guide rail.

3. The electromagnetic tripping mechanism for a circuit breaker according to claim 1 or 2, characterized in that: The mounting seat (11) is a structure extending along the first axis, and the sliding seat (31) is a structure extending along the first axis and buckled on the side of the mounting seat (11).

4. The electromagnetic tripping mechanism for a circuit breaker according to claim 1, characterized in that: The mounting seat (11) has a top surface and a bottom surface which are spaced apart by a set distance in height and extend horizontally; the mounting groove (13) is arranged between the top surface and the bottom surface, and the opening is oriented in a horizontal direction; the sliding seat (31) is a U-shaped structure, comprising a first side wall (311) and a second side wall (312) arranged corresponding to the top surface and the bottom surface, and an intermediate plate (310) connecting the first side wall (311) and the second side wall (312); the mounting plate (34) and the push rod (32) are arranged on the intermediate plate (310).

5. The electromagnetic tripping mechanism for a circuit breaker according to claim 1, characterized in that: The sliding seat (31) and the push rod (32) are an integral structure.

6. A circuit breaker, characterized in that: It comprises a first shell (1) and a second shell (2) which are snapped together to form the shell, a contact mechanism arranged in the shell, an operating mechanism for controlling the contact mechanism, and an electromagnetic tripping mechanism according to any one of claims 1 to 5.

7. The circuit breaker according to claim 6, characterized in that: The operating mechanism comprises: A contact bracket (4) is rotatably mounted on the first housing (1) via a bracket rotating shaft (45), and a blocking structure (42) and a moving contact (41) are respectively provided at the upper and lower ends; A lock buckle (5) rotatably mounted on the contact bracket (4) via the bracket rotation shaft (45), the lock buckle (5) comprising a first end arm (51); A locking elastic member (50), one end of which is connected to the contact bracket (4) and the other end of which is connected to the locking member (5); under the action of the locking elastic member (50), the first end arm (51) and the blocking structure (42) are relatively formed to form a first bracket groove (43) and a second bracket groove (44); A handle connecting rod (61), one end of which is connected to the handle (6), and the other end of which is movably connected to the first bracket groove (43) or the second bracket groove (44); when the handle connecting rod (61) slides in the first bracket groove (43), it can push the contact bracket (4) and the lock buckle (5) to rotate; A disconnecting elastic member (40) has one end connected to the first housing (1) and the other end connected to the contact bracket (4); under the action of the disconnecting elastic member (40), the contact bracket (4) is in an initial position.

8. The circuit breaker according to claim 7, characterized in that: A first protrusion (511) at the middle of the first end arm (51) and the blocking structure (42) are opposite to form a first notch, and a second protrusion (512) at the end of the first end arm (51) and the blocking structure (42) are opposite to form a second notch for preventing the handle connecting rod (61) from sliding out of the second bracket groove (44); In the off state, one end of the handle connecting rod (61) is located in the first bracket groove (43), and its width is greater than the width of the first notch.

9. The circuit breaker according to claim 7, characterized in that: The lock catch (5) also includes a second end arm (52) opposite to the push rod (32) of the electromagnetic tripping mechanism, and the push rod (32) hits the second end arm (52) to drive the lock catch (5) to rotate around the axis, and the second end arm (52) is the trigger structure.

10. The circuit breaker according to claim 7, characterized in that: The lock buckle (5) further comprises a third end arm (53) opposite to the bimetallic strip (7) for realizing overload protection; a second driving block (531) arranged perpendicularly to the third end arm (53) and used for driving in cooperation with the bimetallic strip (7) is provided at the end of the third end arm (53); an indicating portion (532) for indicating a reference adjustment position of the bimetallic strip (7) is provided at the end of the third end arm (53) corresponding to the bimetallic strip (7).

11. The circuit breaker according to claim 10, characterized in that: The indicating portion (532) is in the shape of comb teeth.

12. The circuit breaker according to claim 7, characterized in that: The contact support (4) is provided with a positioning column (46) for installing the moving contact (41), and the disconnecting elastic member (40) is sleeved on the positioning column (46), and has a first section (401) fixedly connected to the moving contact (41), and a second section (402) cooperating and abutting with the limiting structure of the contact support (4), and the end of the second section (402) extends outward from the contact support (4) and abuts against the inner wall of the first shell (1).

13. The circuit breaker according to claim 12, characterized in that: The limiting structure is a second limiting block (47) in an inverted L shape arranged on the contact bracket (4), and the second limiting block (47) and the contact bracket (4) are opposite to each other to form a slot for the second section (402) of the disconnecting elastic member (40) to penetrate.

Images