Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising a shell which forms accommodating spaces which are isolated at intervals; the contact system comprises a static contact assembly fixedly arranged in the accommodating space and a moving contact assembly rotatably arranged in the accommodating space, and the moving contact assembly swings in the horizontal direction relative to the static contact assembly to realize connection or disconnection of a switch; the electromagnetic operating mechanism comprises a fixed iron core and a movable iron core, the movable iron core is arranged at the position corresponding to the fixed iron core and can swing or translate in the horizontal direction, the movable iron core and the fixed iron core are attracted through excitation of an electromagnetic coil arranged in the fixed iron core, and the movable iron core drives the movable contact assembly to make contact with the static contact assembly so that the switch can be switched on. The utility model has the advantages that the length space of the switch in the horizontal direction is shortened, the miniaturization requirement is met, the anti-vibration performance is prevented from being affected due to the fact that the distance between the mass center of the movable iron core and the rotation center is long, and the situation that the contact rebounds and falls back in the opening process is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a switch. Background Art

[0002] Although the spring mechanism can realize the closing operation of the switch, the spring mechanism has many parts and the action links are complicated. The use of electromagnetic components can make up for the shortcomings of the above-mentioned spring mechanism.

[0003] Figure 1The schematic diagram of a switch using an electromagnetic assembly in the prior art is shown, which includes a housing 10 made of an insulating material such as plastic. The housing 10 includes a left housing 101 and a right housing 102. The left and right housings 101 and 102 are matched face to face to form a phase-isolated accommodation space 103. A load-side terminal 1011 (also called a "stationary contact outlet row") penetrating the wall of the left housing 101 is fixed to the upper left side of the left housing 101, and a power-side terminal 1012 (also called a "stationary contact outlet row") is fixed to the lower left side. The contact system 1 located in the phase-isolated accommodation space 103 comprises a stationary contact assembly 11 fixedly arranged on the left housing 101 and located in the left housing cavity, and a moving contact assembly 12 rotatably arranged on the left housing 101 with a fixed fulcrum as the rotation center and also located in the left housing cavity. The stationary contact assembly 11 is electrically connected to the load-side terminal, and the moving contact assembly 12 is electrically connected to the power-side terminal 1012 through a soft connection. The assembly 12 swings in the horizontal direction relative to the static contact assembly 11 to realize the connection or disconnection of the switch. A sealing surface 1021 is formed on the right housing 102 and at a position corresponding to the movable contact assembly 12, and a connecting rod clearance hole 1022 is also provided; a main shaft 2, which is supported by its two rotations on a main shaft rotation support seat arranged on the side of the right housing 102 facing away from the left housing 101; an operating arm assembly 3 and an electromagnetic operating mechanism 4, the operating arm assembly 3 is fixedly arranged on the main shaft 2 The operating arm assembly 3 is hinged to one end of the moving contact connecting rod 5 extending outside the accommodating space 103 through the connecting rod yielding hole 1022 and is directly or indirectly hinged to the electromagnetic operating mechanism 4. The other end of the moving contact connecting rod 5 is connected to the moving contact assembly 12 in the accommodating space 103. The electromagnetic operating mechanism 4 includes a fixed iron core 41 and a moving iron core 42. The fixed iron core 41 is fixed to the side of the right shell 102 facing away from the left shell 101 (that is, fixed to the outside of the shell 10). An electromagnetic coil 411 is provided in the fixed iron core 41, and the moving iron core 42 is hinged to the fixed iron core 41 through the moving iron core hinge pin 421 on the side facing the right shell 102, and the operating arm assembly 3 is directly or indirectly hinged to the side of the moving iron core 42 away from the right shell 102. Through the excitation of the electromagnetic coil 411, the fixed iron core 41 attracts the moving iron core 42, and the moving iron core 42 drives the operating arm assembly 3. At the same time, the main shaft 2 is driven to rotate by the operating arm assembly 3, and the moving contact assembly 12 is driven by the moving contact connecting rod 5 to contact the static contact assembly 11 to realize the connection of the switch.

[0004] The above Figure 1The movable iron core 42 of the switch of the structure shown is driven to rotate clockwise or counterclockwise around the movable iron core hinge pin 421 as the rotation center, although it can finally achieve the purpose of making the movable contact assembly 12 contact or separate with the static contact assembly 11 to realize the switch on or off. However, there are the following technical problems: since the housing 10 is in the actual use state Figure 1 The electromagnetic operating mechanism 4 is installed vertically in the position state shown in the figure, and the electromagnetic operating mechanism 4 is installed outside the shell 10 in a state perpendicular to the right shell 102 relative to the right shell 102 of the shell 10, that is, the electromagnetic operating mechanism 4 is arranged on the right side of the right shell 102 in a horizontal cantilever state, thereby significantly increasing the length space of the circuit breaker in the horizontal direction or the X-axis direction, which is extremely unfavorable for the miniaturization of the switch structure; since the mass of the moving iron core 42 made of metal is relatively large, when it moves up and down relative to the fixed iron core, because the distance between its center of mass and the center of rotation (from the center of rotation) is far, on the one hand, the vibration resistance of the switch will be poor, and on the other hand, the probability of the contact rebounding and falling back during the opening process will be increased. Utility Model Content

[0005] The task of the utility model is to provide a switch which helps to significantly shorten the horizontal length space so as to ideally meet the miniaturization requirements, helps to avoid poor vibration resistance due to the long distance between the center of mass of the moving iron core and the rotation center, and avoids the rebound and fall of contacts during the opening process.

[0006] The task of the utility model is accomplished in this way. A switch comprises: a shell, which constitutes a phase-isolated accommodating space; a contact system, which comprises a static contact assembly fixedly arranged in the accommodating space and a moving contact assembly rotatably arranged in the accommodating space, and the switch is turned on or off by the moving contact assembly swinging in the horizontal direction relative to the static contact assembly; an electromagnetic operating mechanism, which comprises a fixed iron core and a moving iron core, and the moving iron core is arranged at a position corresponding to the fixed iron core and can swing or translate in the horizontal direction, and the moving iron core is attracted to the fixed iron core by the excitation of the electromagnetic coil arranged in the fixed iron core, and the moving iron core drives the moving contact assembly to contact with the static contact assembly to realize the switch is turned on.

[0007] In a specific embodiment of the present utility model, the switch also includes a main shaft and an operating arm assembly, the main shaft is rotatably arranged on the shell, the operating arm assembly includes a moving iron core operating arm and a moving contact connecting rod operating arm, there is a pair of moving iron core operating arms and they correspond to the two sides of the moving iron core respectively, the pair of moving iron core operating arms are sleeved on the main shaft at one end facing the main shaft, the end of the moving iron core away from the main shaft is hinged between the ends of the pair of moving iron core operating arms away from the main shaft through the first connecting and fixing axis of the moving iron core magnetic iron plate, and the end of the moving iron core facing the main shaft is also hinged between the pair of moving iron core operating arms through the second connecting and fixing axis of the moving iron core magnetic iron plate, each of the moving contact assemblies corresponds to a moving contact connecting rod operating arm, the end of the moving contact connecting rod operating arm facing the main shaft is sleeved on the main shaft, and the end of the moving contact connecting rod operating arm away from the main shaft is hinged to one end of the moving contact connecting rod, and one end of the moving contact connecting rod extends outside the connecting rod yield hole opened on the shell.

[0008] In another specific embodiment of the utility model, the switch also includes a main shaft and an operating arm assembly, the main shaft is rotatably arranged on the shell, the operating arm assembly includes a moving iron core operating arm, a moving contact connecting rod operating arm, and a pair of connecting rods, one end of the moving contact connecting rod operating arm facing the main shaft is sleeved on the main shaft, and the end of the moving contact connecting rod operating arm away from the main shaft is also hinged to the end of the moving contact connecting rod extending to the outside of the connecting rod yielding hole opened on the shell, one end of a pair of moving iron core operating arms is respectively sleeved on the main shaft, and the other end of the moving iron core operating arm is respectively hinged to one end of a pair of connecting rods, and the other end of the pair of connecting rods is hinged to the two ends of the second connecting fixed shaft of the moving iron core magnetic iron plate of the moving iron core, and one end of the moving iron core is hinged to the fixed iron core through the moving iron core hinge pin.

[0009] In another specific embodiment of the present invention, the fixed iron core is composed of a plurality of U-shaped magnetic iron plates and / or E-shaped magnetic iron plates stacked together, and the moving iron core is composed of a plurality of rectangular magnetic iron plates stacked together.

[0010] In another specific embodiment of the present invention, the E-shaped magnetic iron plate has an additional middle protrusion than the U-shaped magnetic iron plate, and the middle protrusion is located in the frame of the electromagnetic coil disposed in the fixed iron core.

[0011] In another specific embodiment of the utility model, the fixing method of one end of the moving iron core operating arm facing the main shaft is welded on the main shaft, and the fixing method of one end of the moving contact connecting rod operating arm facing the main shaft is welded on the main shaft.

[0012] In a more specific embodiment of the present utility model, both ends of the main shaft are rotatably supported on a main shaft rotation support seat, and the main shaft rotation support seat is fixed on one side of the right shell; the moving contact connecting rod operating arm is hinged to the moving contact connecting rod through the moving contact connecting rod hinge arm pin shaft.

[0013] In a further specific embodiment of the present invention, the switch is a two-pole, three-pole or four-pole circuit breaker.

[0014] In yet another specific embodiment of the present invention, an extension connecting shaft is provided on the moving iron core, and both ends of the extension connecting shaft are respectively hinged to one end of the moving contact connecting rod extending outside the connecting rod yielding hole opened on the housing.

[0015] The technical effect of the technical solution provided by the utility model is that the moving iron core is arranged at a position corresponding to the fixed iron core and can swing or translate horizontally in the horizontal direction, thereby helping to significantly shorten the horizontal length space of the switch and ideally meet the miniaturization requirements, which is beneficial to avoid the impact of the anti-vibration performance due to the long distance between the center of mass of the moving iron core and the center of rotation, and can effectively avoid the rebound and fall of the contacts during the opening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a switch in the prior art;

[0017] Figure 2 A cross-sectional view of a first embodiment of the switch of the utility model;

[0018] Figure 3 for Figure 2 A detailed structural diagram of the switch housing, main shaft, operating arm assembly, electromagnetic operating mechanism, and the connection between the moving contact connecting rod and the moving contact assembly;

[0019] Figure 4 for Figure 2 and Figure 3 remove Figure 2 and Figure 3 A schematic diagram showing that the operating arm assembly is connected to the moving contact assembly through the moving contact connecting rod as viewed from the housing shown;

[0020] Figure 5 The operating arm assembly is connected to the electromagnetic operating mechanism and the movable iron core of the electromagnetic operating mechanism is attracted by the fixed iron core 41;

[0021] Figure 6 is a cross-sectional view of the electromagnetic operating mechanism;

[0022] Figure 7 is a schematic diagram of a four-pole switch;

[0023] Figure 8 This is a structural diagram of the second embodiment of the utility model;

[0024] Fig. 9 for Figure 8 Schematic side view of

[0025] Fig.10 This is a structural diagram of the third embodiment of the utility model;

[0026] Fig.11 for Fig.10 A schematic diagram of the electromagnetic operating mechanism shown;

[0027] Fig.12 for Fig.10 Side schematic diagram of . DETAILED DESCRIPTION Example 1

[0028] See also Figures 2 to 7 , shows a housing 10 made of an insulating material such as plastic (through a mold), the housing 10 includes a left housing 101 and a right housing 102, the left and right housings 101, 102 face each other as shown Figure 2 The left and right sides of the left housing 101 correspond to each other to form a phase-isolated accommodation space 103, and a load-side terminal 1011 that penetrates the wall of the left housing 101 and extends into the accommodation space 103 is fixed to the upper left side of the left housing 101, and a power-side terminal 1012 that also penetrates the wall of the left housing 101 and extends into the accommodation space 103 is fixed to the lower part; a contact system 1 located in the phase-isolated accommodation space 103, the contact system 1 includes a stationary contact assembly 11 disposed on the left housing 101 and electrically connected to the load-side terminal 1011 and located in the aforementioned accommodation space 103 and a fixed fulcrum 121 ( Figure 4 ) is a moving contact assembly 12 which is rotatably arranged on the left housing 101 and is also located in the accommodating space 103 and is electrically connected to the power side terminal 1012 through a flexible connection. The moving contact assembly 12 swings in the horizontal direction relative to the static contact assembly 11 to achieve the connection or disconnection of the switch for closing or tripping. A sealing surface 1021 is formed on the right housing 102 and at a position corresponding to the moving contact assembly 12, and a connecting rod clearance hole 1022 is also provided ( Figure 3 Mark); the electromagnetic operating mechanism 4, the electromagnetic operating mechanism 4 includes a fixed iron core 41 and a moving iron core 42.

[0029] The technical key points of the technical solution provided by the utility model are as follows: the movable iron core 42 is arranged at a position corresponding to the fixed iron core 41 and can swing or translate in the horizontal direction. By exciting the electromagnetic coil 411 arranged in the fixed iron core 41, the movable iron core 42 is attracted to the fixed iron core 41, and the movable iron core 42 drives the movable contact assembly 12 to contact the static contact assembly 11 to realize the switch connection. The horizontal direction is Figure 2 Since the moving iron core 42 rotates around the fixed fulcrum 121 at a small angle, the motion trajectory of the end point farthest from the rotation center is approximately a horizontal straight line. Similarly, the moving iron core 42 rotates with the main shaft 2. Since its rotation angle is small, the motion trajectory of the end point farthest from the rotation center is approximately a horizontal straight line.

[0030] Specifically, a fixed iron core clearance cavity 1023 is provided on the right housing 102 at a position corresponding to between two adjacent moving contact assemblies 12 , and the fixed iron core 41 is fixed in the fixed iron core clearance cavity 1023 at a position corresponding to between the two adjacent moving contact assemblies 12 .

[0031] The switch further comprises a main shaft 2 and an operating arm assembly 3. The main shaft 2 is rotatably arranged on the housing 10. In this embodiment, the main shaft 2 is rotatably supported by its two ends on a main shaft rotation support seat 21 ( Figure 3 The operating arm assembly 3 includes a moving iron core operating arm 31 and a moving contact connecting rod operating arm 32. The moving iron core operating arm 31 has a pair of movable iron core operating arms 31 and corresponds to the two sides of the movable iron core 42 respectively. The end of the pair of movable iron core operating arms 31 facing the main shaft 2 is sleeved on the main shaft 2. The end of the movable iron core 42 away from the main shaft 2 is hinged between the ends of the pair of movable iron core operating arms 31 away from the main shaft 2 through the first connecting fixed shaft 422 of the movable iron core magnetic iron plate, and the end of the movable iron core 42 facing the main shaft 2 is hinged between the ends of the pair of movable iron core operating arms 31 away from the main shaft 2 through the movable iron core magnetic iron plate. The second connecting fixed axis 423 of the core magnetic iron plate is also hinged between a pair of moving iron core operating arms 31. Each of the moving contact assemblies 12 corresponds to a moving contact connecting rod operating arm 32. The moving contact connecting rod operating arm 32 is sleeved on the main shaft 2 at one end facing the main shaft 2, and the moving contact connecting rod operating arm 32 is hinged to one end of the moving contact connecting rod 5 at one end away from the main shaft 2, and one end of the moving contact connecting rod 5 extends to the outside of the connecting rod yielding hole 1022 opened on the shell 10.

[0032] Depend on Figures 3 to 5 as well as Figure 7As can be seen from the diagram, in this embodiment, the fixed iron core 41 is composed of a plurality of U-shaped magnetic iron plates 412 and / or E-shaped magnetic iron plates 413 stacked together. In this embodiment, the middle one is an E-shaped magnetic iron plate 413, and the two sides are U-shaped magnetic iron plates 412. The aforementioned moving iron core 42 is composed of a plurality of rectangular magnetic iron plates stacked together.

[0033] Depend on Figure 5 and Figure 6 As shown, the aforementioned E-shaped magnetic iron plate 413 has an additional middle protrusion 414 compared to the aforementioned U-shaped magnetic iron plate 412 . The middle protrusion 414 is located in the frame of the aforementioned electromagnetic coil 411 disposed in the fixed iron core 41 .

[0034] In this embodiment, the fixing method of the end of the moving iron core operating arm 31 facing the main shaft 2 is welding, and the fixing method of the end of the moving contact connecting rod operating arm 32 facing the main shaft 2 is welding.

[0035] Depend on Figure 3 and Figure 7 As shown, both ends of the main shaft 2 are rotatably supported on the main shaft rotation support seat 21, and the main shaft rotation support seat 21 is fixed to the side of the right housing 102 facing away from the left housing 101; the moving contact connecting rod operating arm 32 is hinged to the moving contact connecting rod 5 through the moving contact connecting rod hinge arm pin 321 ( Figure 3 , Figure 4 Show).

[0036] exist Figure 7 A switch with a four-pole structure is shown in the figure. Of course, the switch can also be a two-pole or a three-pole switch. However, no matter it is a two-pole, three-pole or four-pole switch, only one (also called a set) of electromagnetic operating mechanisms 4 is required.

[0037] As described above, when the electromagnetic coil 411 is energized, that is, under the excitation action of the electromagnetic coil 411 arranged in the fixed iron core 41, the fixed iron core 41 attracts the moving iron core 42, and the moving iron core 42 drives a pair of moving iron core operating arms 31 through the first connecting fixed shaft 422 of the moving iron core magnetic iron plate. Since the pair of moving iron core operating arms 31 are fixedly sleeved on one end of the main shaft 2, that is, welded and fixed on the main shaft 2, the pair of moving iron core operating arms 31 drive the main shaft 2 to rotate counterclockwise, so that the main shaft 2 drives a pair of moving contact connecting rod operating arms 32, and the pair of moving contact connecting rod operating arms 32 drive the moving contact connecting rod 5, and the moving contact connecting rod 5 drives the moving contact assembly 12, so that the moving contact assembly 12 is in contact with the static contact assembly 11 to realize circuit connection, otherwise they are separated to realize circuit disconnection. Example 2

[0038] See also Figures 8 to 9The switch also includes a main shaft 2 and an operating arm assembly 3, wherein the main shaft 2 is rotatably arranged on the housing 10, and the operating arm assembly 3 includes a moving iron core operating arm 31, a moving contact connecting rod operating arm 32, and a pair of connecting rods 33. The moving contact connecting rod operating arm 32 is sleeved on the main shaft 2 at one end thereof, and the moving contact connecting rod operating arm 32 is hinged to one end thereof which is away from the main shaft 2 and extends to the connecting rod yielding hole 1022 opened on the housing 10. One end of a pair of moving iron core operating arms 31 is respectively sleeved on the main shaft 2, and the other end is respectively hinged to one end of a pair of connecting rods 33, and the other end of the pair of connecting rods 33 is hinged to the two ends of the second connecting fixed shaft 423 of the moving iron core magnetic iron plate of the moving iron core 42. One end of the moving iron core 42 is hinged to the aforementioned fixed iron core 41 through the moving iron core hinge pin 421, and the moving iron core 42 can swing laterally in the horizontal direction around the iron core hinge shaft 421. The horizontal direction is Figure 2 The XO direction shown. The fixing method of the aforementioned pair of movable iron core operating arms 31 is respectively sleeved on the aforementioned main shaft 2 by welding, and the aforementioned other ends of the aforementioned pair of movable iron core operating arms 31 are respectively hinged to the ends of the aforementioned pair of connecting rods 33 through the connecting rod connecting arm hinge pin 331 and one end of the aforementioned pair of connecting rods 33. The rest is the same as the description of embodiment 1. Example 3

[0039] See also Figures 10 to 12 , and further includes an extension connecting shaft 6, the extension connecting shaft 6 is passed through the moving iron core 42 and the two ends are respectively hinged with one end of the moving contact connecting rod 5 extending to the outside of the connecting rod clearance hole 1022 opened on the housing 10, that is, the middle part of the extension connecting shaft 6 is passed through the moving iron core 42, and the two ends of the extension connecting shaft 6 are respectively hinged with one end of the moving contact connecting rod 5, and one end of the moving contact connecting rod 5 extends to the outside of the connecting rod clearance hole 1022 opened on the housing 10. Specifically, the moving iron core 42 is formed with an extension 424, and an extension connecting shaft hole 4241 is opened at the end of the extension 424, and an extension connecting shaft 6 passes through the extension connecting shaft hole 4241 so that the extension 424 is located in the middle of the extension connecting shaft 6, and the two ends of the extension connecting shaft 6 are respectively connected to the corresponding moving iron core connecting rod 5. Compared with embodiments 1 and 2, this embodiment 3 only uses an extension connecting shaft 6 to connect the moving iron core 42 and the moving iron core connecting rod 5, that is, the extension connecting shaft 6 plays the role of the operating arm assembly 3 and the main shaft 2, thereby significantly simplifying the structure of the operating arm assembly 3 and the main shaft 2 of embodiments 1 and 2. In addition, in this embodiment, the moving iron core 42 translates in the horizontal direction and is attracted to the fixed iron core 41. The horizontal direction is Fig.11The so-called translation in the XO direction is a lateral movement in the XO direction, that is, the moving iron core 42 moves from left to right to engage with the fixed iron core 41.

[0040] The present invention is not limited to the above-mentioned embodiments 1 to 3. Any changes in form but not in substance based on the contents disclosed in the present invention shall be deemed to be within the technical connotation of the present invention.

[0041] In summary, the technical solution provided by the utility model makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A switch, comprising: A housing (10), the housing (10) forming a phase-isolated accommodation space (103); a contact system (1), the contact system (1) comprising a stationary contact assembly (11) fixedly arranged in the accommodation space (103) and a moving contact assembly (12) rotatably arranged in the accommodation space (103), the moving contact assembly (12) swinging in a horizontal direction relative to the stationary contact assembly (11) to achieve the connection or disconnection of the switch; an electromagnetic operating mechanism (4), the The electromagnetic operating mechanism (4) comprises a fixed iron core (41) and a moving iron core (42), and is characterized in that the moving iron core (42) is arranged at a position corresponding to the fixed iron core (41) and can swing or translate in the horizontal direction. By exciting the electromagnetic coil (411) arranged in the fixed iron core (41), the moving iron core (42) and the fixed iron core (41) are attracted, and the moving iron core (42) drives the moving contact assembly (12) to contact the stationary contact assembly (11) to realize the switch being turned on.

2. A switch according to claim 1, characterized in that: The switch further comprises a main shaft (2) and an operating arm assembly (3), wherein the main shaft (2) is rotatably arranged on a housing (10), and the operating arm assembly (3) comprises a moving iron core operating arm (31) and a moving contact connecting rod operating arm (32), wherein the moving iron core operating arms (31) are in a pair and correspond to two sides of the moving iron core (42), respectively, and the end of the pair of moving iron core operating arms (31) facing the main shaft (2) is sleeved on the main shaft (2), and the end of the moving iron core (42) away from the main shaft (2) is hinged to the end of the pair of moving iron core operating arms (31) away from the main shaft (2) through a first connecting fixed shaft (422) of a moving iron core magnetic iron plate. The movable iron core (42) is hinged between the two ends, and the end of the movable iron core (42) facing the main shaft (2) is also hinged between a pair of movable iron core operating arms (31) through the second connecting fixed shaft (423) of the movable iron core magnetic iron plate. Each movable contact assembly (12) corresponds to a movable contact connecting rod operating arm (32). The end of the movable contact connecting rod operating arm (32) facing the main shaft (2) is sleeved on the main shaft (2), and the end of the movable contact connecting rod operating arm (32) away from the main shaft (2) is hinged to one end of the movable contact connecting rod (5), and one end of the movable contact connecting rod (5) extends to the outside of the connecting rod clearance hole (1022) opened on the housing (10).

3. A switch according to claim 1, characterized in that: The switch further comprises a main shaft (2) and an operating arm assembly (3), wherein the main shaft (2) is rotatably arranged on a housing (10), and the operating arm assembly (3) comprises a moving iron core operating arm (31), a moving contact connecting rod operating arm (32), and a pair of connecting rods (33), wherein one end of the moving contact connecting rod operating arm (32) facing the main shaft (2) is sleeved on the main shaft (2), and the other end of the moving contact connecting rod operating arm (32) away from the main shaft (2) also extends together with the moving contact connecting rod (5) to a position provided in the housing. One end of the connecting rod on (10) outside the clearance hole (1022) is hinged, one end of a pair of moving iron core operating arms (31) are respectively sleeved on the main shaft (2), and the other end of the moving iron core operating arm (31) is respectively hinged to one end of a pair of connecting rods (33), and the other end of the pair of connecting rods (33) is hinged to the two ends of the second connecting fixed axis (423) of the moving iron core magnetic iron plate of the moving iron core (42), and one end of the moving iron core (42) is hinged to the fixed iron core (41) through the moving iron core hinge pin (421).

4. A switch according to claim 1, 2 or 3, characterized in that: The fixed iron core (41) is composed of a plurality of U-shaped magnetic iron plates (412) and / or E-shaped magnetic iron plates (413) stacked together, and the moving iron core (42) is composed of a plurality of rectangular magnetic iron plates stacked together.

5. A switch according to claim 4, characterized in that: The E-shaped magnetic iron plate (413) has an additional middle protrusion (414) compared to the U-shaped magnetic iron plate (412), and the middle protrusion (414) is located in the frame of the electromagnetic coil (411) arranged in the fixed iron core (41).

6. A switch according to claim 2 or 3, characterized in that: The fixing method of one end of the moving iron core operating arm (31) facing the main shaft (2) being sleeved on the main shaft (2) is welding fixing, and the fixing method of one end of the moving contact connecting rod operating arm (32) facing the main shaft (2) is welding fixing.

7. A switch according to claim 2 or 3, characterized in that: The two ends of the main shaft (2) are rotatably supported on a main shaft rotation support seat (21), and the main shaft rotation support seat (21) is fixed to one side of the right housing (102); the moving contact connecting rod operating arm (32) is hinged to the moving contact connecting rod (5) through a moving contact connecting rod hinge arm pin (321).

8. A switch according to claim 1, characterized in that: The switch is a two-pole, three-pole or four-pole circuit breaker.

9. A switch according to claim 2 or 3, characterized in that: An extended connecting shaft (6) is provided on the moving iron core (42), and both ends of the extended connecting shaft (6) are respectively hinged to one end of the moving contact connecting rod (5) extending outside the connecting rod clearance hole (1022) provided on the housing (10).

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