Circuit breaker

Abstract

The circuit breaker comprises a shell, an operating mechanism, a traction rod, a protection mechanism, at least one rotating shaft system, and a static contact and an arc extinguish chamber which respectively correspond to the rotating shaft system, the protection mechanism comprises at least one air blowing mechanism, the rotating shaft system, the static contact and the arc extinguish chamber are arranged at intervals in the width direction of the circuit breaker, the operating mechanism is located above the rotating shaft system, the arc extinguish chamber is located above the static contact, and the arc extinguish chamber is located on one side of the operating mechanism in the length direction of the circuit breaker. The draw bar is rotatably arranged on the other side of the operating mechanism, the length direction of the air blowing mechanism is arranged along the length direction of the circuit breaker, one end of the air blowing mechanism in the length direction is located between two adjacent arc extinguish chambers, and the other end of the air blowing mechanism in the length direction is arranged opposite to the draw bar; the sliding direction of the push rod of the air blowing mechanism is arranged along the length of the circuit breaker. According to the circuit breaker, the overall layout of the circuit breaker is compact and reasonable, the air blowing mechanism is horizontally arranged in the circuit breaker, and the breaking capacity of the circuit breaker is improved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a circuit breaker. Background Technology

[0002] Circuit breakers are commonly used to control the connection and disconnection of circuits, and to automatically disconnect the circuit through a protection mechanism when a fault occurs, thereby achieving the protection function.

[0003] Existing circuit breakers have complex structures and limited internal space, making it impossible to add functional modules within the limited space, such as by adding an air-blowing tripping device to improve the breaking capacity of the circuit breaker and increase the tripping speed under high current conditions such as short circuits. Utility Model Content

[0004] The purpose of this utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circuit breaker includes a housing, an operating mechanism, a traction rod, a protection mechanism, and at least one rotating shaft system installed within the housing, as well as stationary contacts and an arc-extinguishing chamber corresponding to the rotating shaft system, wherein the rotating shaft system includes a moving contact, and the operating mechanism is capable of driving the rotating shaft system to make the moving contact contact or separate from the corresponding stationary contact;

[0007] The protection mechanism includes at least one air blowing mechanism, which includes a sealing shell, a push rod, and a first spring for driving the push rod to retract into the sealing shell. The sealing shell has an air inlet on at least one side, and the arc-extinguishing chamber has an air outlet corresponding to the air inlet. The push rod is slidably disposed inside the sealing shell and can slide in the direction of extending out of the sealing shell under the action of the gas pressure inside the sealing shell to drive the traction rod to rotate and disengage the operating mechanism.

[0008] The rotating shaft system, stationary contact, and arc-extinguishing chamber are all arranged at intervals along the width direction of the circuit breaker. The operating mechanism is located above the rotating shaft system, and the arc-extinguishing chamber is located above the stationary contact. The arc-extinguishing chamber is located on one side of the operating mechanism along the length direction of the circuit breaker. The traction rod is rotatably mounted on the other side of the operating mechanism. The length direction of the air-blowing mechanism is set along the length direction of the circuit breaker. One end of the air-blowing mechanism is located between two adjacent arc-extinguishing chambers, and the other end of the air-blowing mechanism is set opposite to the traction rod. The sliding direction of the push rod of the air-blowing mechanism is set along the length of the circuit breaker.

[0009] Optionally, the air-blowing mechanism passes through the shaft system from above and from the side of the operating mechanism and engages with the traction rod, with the operating mechanism located between at least two air-blowing mechanisms in the width direction of the circuit breaker.

[0010] Optionally, the push rod includes a push rod body slidably disposed within the sealed housing and a push rod extension portion extending out of the sealed housing, and the traction rod includes a first driven arm corresponding to the push rod extension portion of the air blowing mechanism; the push rod can slide in the direction of extending out of the sealed housing under the action of gas pressure inside the sealed housing, so that the push rod extension portion pushes against the first driven arm.

[0011] Optionally, the sealing shell is provided with a sliding cavity that slides with the push rod body and a buffer cavity that connects the sliding cavity and the air inlet. The buffer cavity is provided with a blocking plate that covers the air inlet and is used to prevent metal particles from entering the sealing shell.

[0012] Optionally, the buffer cavity is provided with a slot; the blocking piece is an L-shaped paper piece, one end of which is inserted and fixed in the slot, and the other end covers the air inlet.

[0013] Optionally, the buffer cavity is provided with a guide rib, which is located between the air inlet and the sliding cavity.

[0014] Optionally, air inlets are provided on both sides of the sealing shell, and a partition rib is provided in the buffer cavity. The partition rib is located between the two air inlets and divides the buffer cavity into two compartments.

[0015] Optionally, the first spring is disposed between the outer side of the sealing housing and the push rod extension.

[0016] Optionally, the sealing shell has a receiving cavity at the end away from the air inlet, and the first spring and the push rod extension are respectively placed in the receiving cavity. The first spring is a compression spring, and the push rod extension includes a first release arm that extends out of the receiving cavity and is used to push the first driven arm.

[0017] Optionally, the receiving cavity has a first sidewall and a second sidewall arranged sequentially at intervals along the direction in which the push rod extends out of the sealing shell. The push rod extension further includes a limiting rod and a mounting rod. One end of the push rod body passes through the first sidewall. The limiting rod is an L-shaped structure with its opening facing the second sidewall. The outer side of one end of the limiting rod is connected to one end of the push rod body. The length direction of the mounting rod is arranged along the sliding direction of the push rod. One end of the mounting rod passes through the second sidewall. The other end of the mounting rod is connected to the inner side of one end of the limiting rod. The other end of the limiting rod extends away from the mounting rod and is provided with a first release arm. The first spring is sleeved on the mounting rod, and its two ends abut against the second sidewall and the inner side of one end of the limiting rod, respectively.

[0018] Optionally, the push rod body includes a longitudinal rod and a transverse rod connected in a T-shape, the length direction of the transverse rod is arranged along the sliding direction of the push rod, and the end of the transverse rod away from the longitudinal rod is connected to the push rod extension; the air inlet is located on the side of the longitudinal rod away from the transverse rod.

[0019] Optionally, the protection mechanism further includes a thermomagnetic trip unit and a magnetic adjustment assembly. The magnetic adjustment assembly includes a magnetic adjustment knob, a magnetic adjustment rod, and a transmission rod, all rotatably mounted, and a second spring disposed between the magnetic adjustment rod and the transmission rod. The thermomagnetic trip unit includes a second bracket fixed to the housing, a magnetic yoke fixed to the second bracket, an armature rotatably mounted on the second bracket, and an armature spring disposed between the second bracket and the armature. The magnetic adjustment knob drives the magnetic adjustment rod, and the transmission rod abuts against the armature. Rotation of the magnetic adjustment knob can drive the magnetic adjustment rod to rotate, thereby adjusting the deformation of the second spring.

[0020] Optionally, the armature includes an engagement portion for engaging with the engagement surface of the magnetic yoke, and a second release arm that abuts against the second driven arm of the traction rod and an armature rotating arm rotatably connected to the second bracket are respectively provided on both sides of the engagement portion; the transmission rod includes a transmission rod body, and a second connecting arm that is connected to the second spring and a transmission arm that abuts against the engagement portion are respectively provided on both sides of the transmission rod body.

[0021] Optionally, the magnetic adjustment assembly further includes a magnetic adjustment screw, which is disposed opposite to the second connecting arm of the transmission rod. By rotating the magnetic adjustment screw, the transmission rod is rotated by pushing against the second connecting arm, which in turn pushes against the attraction part to rotate the armature, thereby adjusting the distance between the armature and the magnetic yoke.

[0022] Optionally, the protection mechanism further includes a thermomagnetic trip unit and a thermal adjustment assembly. The thermal adjustment assembly includes a rotatable thermal adjustment knob and a thermal adjustment plate mounted on the traction rod. The thermal adjustment plate rotates synchronously with the traction rod and can slide along the rotation axis of the traction rod. The thermomagnetic trip unit includes a bimetallic strip, one end of which is fixed, and the other end is provided with an actuating element. The actuating element drives the traction rod to rotate through the thermal adjustment plate. The thermal adjustment knob adjusts the distance between the actuating element and the thermal adjustment plate by adjusting the displacement of the thermal adjustment plate in the rotation axis direction of the traction rod.

[0023] Optionally, the heat adjustment plate has a first stop plane, an adjustment slope and a second stop plane connected in sequence on the side facing the trigger, and a sliding column is protruding on the other side of the heat adjustment plate, the sliding column being slidably inserted into the groove of the traction rod.

[0024] The circuit breaker of this utility model adds a pneumatic blowing mechanism. The circuit breaker's breaking gas pushes the traction rod through the push rod to trip, which speeds up the circuit breaker's breaking speed and improves the circuit breaker's breaking qualification rate. Moreover, the overall layout of the circuit breaker is compact and reasonable. The pneumatic blowing mechanism is horizontally placed inside the circuit breaker and will not interfere with other components. Furthermore, the push rod of the pneumatic blowing mechanism does not need to overcome its own weight to slide horizontally, making the pneumatic blowing mechanism more sensitive and the tripping action faster, thereby improving the circuit breaker's breaking capacity.

[0025] Furthermore, due to the downward movement of the rotating shaft system and the expansion of the arc-extinguishing chamber space, the air-blowing mechanism can pass through from above the rotating shaft system and to the side of the operating mechanism, resulting in a compact and reasonable overall layout.

[0026] In addition, the baffle plate effectively prevents metal particles from entering the sealed housing, thus avoiding affecting the release force of the push rod and improving the safety of the air blowing mechanism and the reliability of the release function. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the circuit breaker of this utility model;

[0028] Figure 2 This is a schematic diagram of the circuit breaker of this utility model with the outer casing removed;

[0029] Figure 3 This is a schematic diagram of the air blowing mechanism of this utility model;

[0030] Figure 4 This is a schematic diagram of the structure inside the sealing shell of the air blowing mechanism in Embodiment 1 of this utility model;

[0031] Figure 5 This is a schematic diagram of the structure inside the sealing shell of the air blowing mechanism in Embodiment 2 of this utility model;

[0032] Figure 6 This is a structural schematic diagram of the traction rod, thermomagnetic release device, magnetic adjustment component, and thermal adjustment component of this utility model;

[0033] Figure 7 This is a schematic diagram of the structure of the thermomagnetic trip device of this utility model;

[0034] Figure 8 This is a schematic diagram of the structure of the traction rod of this utility model;

[0035] Figure 9 This is a schematic diagram of the structure of the magnetic adjustment component and the thermal adjustment component of this utility model;

[0036] Figure 10 This is a schematic diagram of the structure of the heat regulation plate of this utility model.

[0037] 100 outer casing; 110 base; 120 middle cover; 130 upper cover; 200 operating mechanism; 300 traction rod; 310 traction rod body; 320 first driven arm; 330 second driven arm; 340 positioning plate; 341 slide groove; 400 rotating shaft system; 410 moving contact; 420 stationary contact; 500 arc-extinguishing chamber; 501 air outlet; 510 side plate; 520 arc-extinguishing grid; 600 air blowing mechanism; 610 sealing shell. Air inlet 611; sliding cavity 612; buffer cavity 613; slot 614; guide rib 615; partition rib 616; receiving cavity 617; first side wall 618; second side wall 619; push rod 620; push rod body 620a; push rod extension 620b; longitudinal rod 621; transverse rod 622; first release arm 623; limit rod 624; mounting rod 625; first spring 630; blocking plate 640; Thermomagnetic trip unit 700; bimetallic strip 710; actuating element 711; second bracket 720; magnetic yoke 730; armature 740; engaging part 741; second tripping arm 742; armature rotating arm 743; connecting plate 750; terminal block 760; wire 770; magnetic adjustment assembly 800; magnetic adjustment knob 810; spiral surface 811; magnetic adjustment rod 820; magnetic adjustment rod body 821; adjustment arm 822; first connecting arm 823; Transmission rod 830; Transmission rod body 831; Second connecting arm 832; Transmission arm 833; Second spring 840; Third bracket 850; Magnetic adjusting screw 860; Heat adjustment assembly 900; Heat adjustment knob 910; Eccentric column 911; Heat adjustment plate 920; First stop plane 921; Adjusting slope 922; Second stop plane 923; Sliding column 924; Adjusting protrusion 925; Adjusting groove 926. Detailed Implementation

[0038] The specific embodiments of the circuit breaker of this utility model are further described below with reference to the accompanying drawings. The circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0039] like Figure 1 and Figure 2 As shown, the circuit breaker of this embodiment includes a housing 100, an operating mechanism 200, a traction rod 300, a protection mechanism, and at least one rotating shaft system 400 installed inside the housing 100, as well as stationary contacts 420 and arc-extinguishing chambers 500 corresponding to the rotating shaft system 400. The housing 100 includes a base 110, a middle cover 120, and an upper cover 130 sequentially arranged along the height direction of the circuit breaker. The rotating shaft system 400 includes a moving contact 410. The operating mechanism 200 can drive the rotating shaft system 400 to rotate, so that the moving contact 410 contacts or separates from the corresponding stationary contact 420. When a circuit fault occurs (overload, short circuit, etc.), the protection mechanism can drive the traction rod 300 to rotate, causing the operating mechanism 200 to trip.

[0040] It should be noted that, with Figure 1 The vertical direction in the diagram represents the height of the circuit breaker, the horizontal direction represents its length, and the direction perpendicular to the drawing represents its width. The operating mechanism 200 typically includes a first support, a rocker arm assembly, an energy storage spring, a latch mechanism, and a linkage mechanism. The linkage mechanism includes a crank and a connecting rod. The rocker arm assembly is rotatably mounted on the first support. The latch mechanism includes a jump catch and a locking catch. The jump catch, locking catch, and traction rod 300 are rotatably mounted on the first support. The locking catch is latched to the jump catch, and the traction rod 300 is limited by the locking catch. The crank is rotatably mounted on the jump catch via a crankshaft. One end of the connecting rod is rotatably connected to the crank via a spring shaft, and the other end is directly or indirectly connected to the rotating shaft system 400 to drive the rotating shaft system 400 to rotate. One end of the energy storage spring is connected to the rocker arm assembly, and the other end is connected to the spring shaft at the connection between the connecting rod and the crank. The latch and trip latch of the latch connection restrict the rotation position of the crank, allowing the crank to rotate around the trip latch as the rotation center. The handle drives the rocker arm assembly to swing, which in turn drives the crank and connecting rod to rotate. This, in turn, drives the shaft system 400 to rotate, causing the moving contact 410 to rotate and connect or disconnect the main circuit, thus achieving the closing and opening of the circuit breaker. When the circuit breaker is in the closed state, if a fault occurs in the main circuit, the protection mechanism drives the traction rod 300 to rotate, causing the traction rod 300 to release its limiting engagement with the latch. This, in turn, releases the latch and trip latch engagement, causing the operating mechanism 200 to trip. The trip latch can no longer restrict the crank position, and the energy storage spring releases energy, driving the shaft system 400 to rotate via the connecting rod mechanism. This causes the moving contact 410 to rotate and separate from the stationary contact 420, disconnecting the main circuit and achieving trip protection. This is existing technology in the field.

[0041] like Figures 3-5 As shown, the protection mechanism of this embodiment includes at least one air blowing mechanism 600. The air blowing mechanism 600 includes a sealing shell 610, a push rod 620, and a first spring 630 for driving the push rod 620 to retract into the sealing shell 610. The sealing shell 610 has an air inlet 611 on at least one side. The air inlet 611 is used to allow gas generated when the circuit breaker is disconnected to enter the sealing shell 610. The arc-extinguishing chamber 500 has an air outlet 501 corresponding to the air inlet 611. The push rod 620 is slidably disposed in the sealing shell 610. The push rod 620 can slide in the direction of extending out of the sealing shell 610 under the action of the gas pressure in the sealing shell 610 to drive the traction rod 300 to rotate, thereby disengaging the operating mechanism 200.

[0042] like Figure 2As shown, the rotating shaft system 400 is arranged at intervals along the width direction of the circuit breaker. Correspondingly, multiple stationary contacts 420 are arranged at intervals along the width direction of the circuit breaker, and multiple arc-extinguishing chambers 500 are arranged at intervals along the width direction of the circuit breaker. The operating mechanism 200 is located above the rotating shaft system 400, and the arc-extinguishing chambers 500 are located above the stationary contacts 420. The arc-extinguishing chambers 500 are located on one side of the operating mechanism 200 along the length direction of the circuit breaker. The traction rod 300 is rotatably arranged on the other side of the operating mechanism 200. The air blowing mechanism 600 is arranged along the length direction of the circuit breaker. One end of the air blowing mechanism 600 is located between two adjacent arc-extinguishing chambers 500, and the other end of the air blowing mechanism 600 is arranged opposite to the traction rod 300. The sliding direction of the push rod 620 of the air blowing mechanism 600 is arranged along the length of the circuit breaker. The circuit breaker in this embodiment adds a pneumatic blowing mechanism 600. The circuit breaker's breaking gas pushes the traction rod 300 through the push rod 620 to trip, which speeds up the circuit breaker's breaking speed and improves the circuit breaker's breaking qualification rate. Moreover, the overall layout of the circuit breaker is compact and reasonable. The pneumatic blowing mechanism 600 is horizontally placed inside the circuit breaker and will not interfere with other components. Furthermore, the push rod 620 of the pneumatic blowing mechanism 600 does not need to overcome its own weight to slide horizontally, making the pneumatic blowing mechanism 600 more sensitive and the tripping action faster, thereby improving the circuit breaker's breaking capacity.

[0043] It should be noted that the arc-extinguishing chamber 500 typically includes two side plates 510 spaced apart and opposite each other along the width direction of the circuit breaker, and a plurality of arc-extinguishing grid plates 520 arranged between the two side plates 510 along the height direction of the circuit breaker. The vent hole 501 is provided on the side plate 510. The moving contact 410 extends into the arc-entry side of the arc-extinguishing chamber 500 and opens and closes with the stationary contact 420. The electric arc generated during the opening and closing of the moving contact 410 and the stationary contact 420 is extinguished in the arc-extinguishing chamber 500, generating high-temperature and high-pressure gas. A portion of the high-temperature and high-pressure gas is discharged from the vent side of the arc-extinguishing chamber 500; another portion of the high-temperature and high-pressure gas is discharged from the arc-extinguishing chamber 500 through the vent hole 501 on the side plate 510, and then passes through the air inlet 611 of the air blowing mechanism 600, blowing up the blocking plate 640 covering the air inlet 611, thereby entering the sealing shell 610, so that the gas in the sealing shell 610 is pressurized to the point that it can push the push rod 620.

[0044] Furthermore, the air-blowing mechanism 600 passes above the rotating shaft system 400 and sideways to the operating mechanism 200, cooperating with the traction rod 300. The operating mechanism 200 is located between at least two air-blowing mechanisms 600 in the width direction of the circuit breaker. Due to the downward slope of the rotating shaft system 400, the space of the arc-extinguishing chamber 500 is expanded, improving the arc-extinguishing performance and allowing the air-blowing mechanism 600 to pass above the rotating shaft system 400 and sideways to the operating mechanism 200, resulting in a compact and reasonable overall layout. Furthermore, the height of the arc-extinguishing chamber 500 is greater than 90% of the circuit breaker height.

[0045] Furthermore, the push rod 620 includes a push rod body 620a slidably disposed within the sealing housing 610 and a push rod extension 620b extending out of the sealing housing 610, and the traction rod 300 includes a first driven arm 320 corresponding to the push rod extension 620b. Figure 8 The push rod 620 can slide out of the sealing shell 610 under the action of gas pressure inside the sealing shell 610, so that the push rod extension 620b pushes against the first driven arm 320 to drive the traction rod 300 to rotate, thereby disengaging the operating mechanism 200.

[0046] like Figures 3-5 As shown, the sealing shell 610 is provided with a sliding cavity 612 that slides with the push rod body 620a and a buffer cavity 613 that connects the sliding cavity 612 and the air inlet 611. The buffer cavity 613 is provided with a blocking plate 640 that covers the air inlet 611 and prevents metal particles from entering the sealing shell 610. The blocking plate 640 effectively prevents metal particles from entering the sealing shell 610, thereby avoiding affecting the tripping force of the push rod 620 and improving the safety and reliability of the tripping function of the air blowing mechanism 600.

[0047] Preferably, the buffer cavity 613 is provided with a slot 614; the blocking piece 640 is an L-shaped paper piece, one end of which is inserted and fixed in the slot 614, and the other end covers the air inlet 611. The buffer cavity 613 is similar to a square, and the height of the buffer cavity 613 is higher than the height of the sliding cavity 612, with the lower part of the buffer cavity flush with and communicating with the sliding cavity 612. Of course, as another embodiment, the blocking piece 640 can also be a straight paper piece, with one end glued to the buffer cavity 613. The blocking piece 640 can also be a plastic sheet with a certain degree of elasticity.

[0048] like Figure 4In one embodiment of the air blowing mechanism 600 shown, a guide rib 615 is provided in the buffer cavity 613, and the guide rib 615 is located between the air inlet 611 and the sliding cavity 612. The arrangement of the guide rib 615 makes the airflow direction in the sealing shell 610 non-straight and bendable, so that the air pressure in the sealing shell 610 increases steadily and continuously, thereby making the push rod 620 move more stably and reliably. In this embodiment, the sealing shell 610 has an air inlet 611 on only one side, and correspondingly, the air blowing mechanism 600 of this embodiment is provided with only one blocking plate 640; the circuit breaker of this embodiment is provided with one or more arc-extinguishing chambers 500, and the side plate 510 facing the air inlet 611 of the arc-extinguishing chamber 500 is provided with an air outlet 501, or both side plates 510 are provided with air outlets 501. Preferably, one end of the guide rib 615 is vertically connected to the lower side wall of the buffer cavity 613, and the other end is bent away from the sliding cavity 612.

[0049] like Figure 5 In the second embodiment of the air-blowing mechanism 600 shown, air inlets 611 are provided on both sides of the sealing shell 610, and a separating rib 616 is provided in the buffer cavity 613. The separating rib 616 is located between the two air inlets 611 and divides the buffer cavity 613 into two compartments. The sealing shell 610 of this embodiment has a fast air intake speed, which can quickly push the push rod 620 and improve the tripping speed of the circuit breaker. Correspondingly, the air-blowing mechanism 600 of this embodiment is provided with two blocking plates 640, which are located in the two compartments respectively; the circuit breaker of this embodiment is provided with multiple arc-extinguishing chambers 500, and the air-blowing mechanism 600 is located between two adjacent arc-extinguishing chambers 500. Air outlets 501 are provided on both side plates 510 of the arc-extinguishing chamber 500. Preferably, one end of the separating rib 616 is connected to a corner of the upper part of the buffer cavity 613 away from the sliding cavity 612, and the other end is bent to the middle position at the connection between the buffer cavity 613 and the sliding cavity 612.

[0050] like Figures 3-5 As shown, the first spring 630 is disposed between the outer side of the sealing shell 610 and the push rod extension 620b. The external placement of the first spring 630 simplifies the internal structure of the sealing shell 610. Furthermore, the sealing shell 610 has a receiving cavity 617 at the end away from the air inlet 611. The first spring 630 and the push rod extension 620b are respectively placed in the receiving cavity 617. The first spring 630 is a compression spring, and the push rod extension 620b includes a first release arm 623 that extends out of the receiving cavity 617 and is used to push against the first driven arm 320.

[0051] Specifically, the receiving cavity 617 has a first sidewall 618 and a second sidewall 619 arranged sequentially at intervals along the direction in which the push rod 620 extends out of the sealing shell 610. The push rod extension 620b also includes a limiting rod 624 and a mounting rod 625. One end of the push rod body 620a passes through the first sidewall 618. The limiting rod 624 is an L-shaped structure with its opening facing the second sidewall 619. The outer side of one end of the limiting rod 624 is connected to one end of the push rod body 620a. The length direction of the mounting rod 625 is set along the sliding direction of the push rod 620. One end of the mounting rod 625 passes through the second side wall 619, and the other end of the mounting rod 625 is connected to the inner side of one end of the limiting rod 624. The other end of the limiting rod 624 extends away from the mounting rod 625 and is provided with the first release arm 623. The first spring 630 is sleeved on the mounting rod 625, and its two ends abut against the second side wall 619 and the inner side of one end of the limiting rod 624, respectively.

[0052] like Figure 4 and Figure 5 As shown, the push rod body 620a includes a longitudinal rod 621 and a transverse rod 622 connected in a T-shape. The transverse rod 622 is positioned along the sliding direction of the push rod 620, and the end of the transverse rod 622 away from the longitudinal rod 621 is connected to the limiting rod 624 of the push rod extension 620b. The air inlet 611 is located on the side of the longitudinal rod 621 away from the transverse rod 622. The push rod body 620a has a T-shaped design, making it lightweight and facilitating the application of gas pressure to the longitudinal rod 621. The transverse rod 622 also serves as a sliding guide, making the sliding of the push rod 620 more stable and reliable. Of course, as another embodiment, the push rod body 620a can also be a straight structure with its length direction along the sliding direction of the push rod 620.

[0053] like Figure 2 As shown, the circuit breaker in this embodiment adopts a single-break structure. The moving contact 410 and the stationary contact 420 are arranged in a one-to-one correspondence. One end of the moving contact 410 is provided with a moving contact point, and the other end is connected to the rotating shaft system 400. The stationary contact 420 is provided with a stationary contact point that cooperates with the moving contact point. The operating mechanism 200 can drive the rotating shaft system 400 to rotate the moving contact 410, thereby causing the moving contact point to contact the stationary contact point to conduct the main circuit of the circuit breaker; the operating mechanism 200 can also drive the rotating shaft system 400 to rotate the moving contact 410, thereby causing the moving contact point to separate from the stationary contact point to disconnect the main circuit of the circuit breaker. Of course, the circuit breaker in this embodiment can also adopt a double-break structure. The air blowing mechanism 600 is suitable for both single-break and double-break circuit breakers, and is particularly suitable for single-break circuit breakers to improve the breaking capacity of the circuit breaker.

[0054] like Figure 2 and Figures 6-8As shown, the protection mechanism of this embodiment also includes a thermomagnetic trip unit 700. The thermomagnetic trip unit 700 is located on the side of the traction rod 300 away from the air blowing mechanism 600, that is, along the length of the circuit breaker. The operating mechanism 200 and the rotating shaft system 400 are located in the middle, and the arc-extinguishing chamber 500 and the thermomagnetic trip unit 700 are located on both sides of the operating mechanism 200 and the rotating shaft system 400, respectively. The traction rod 300 is located between the operating mechanism 200 and the thermomagnetic trip unit 700.

[0055] The rotating shaft system 400 is located on the bottom side of the middle part of the circuit breaker. The rotating shaft system 400 is located on one side of the stationary contact 420 in the length direction of the circuit breaker, that is, the rotating shaft system 400 and the stationary contact 420 are on the same horizontal line. The operating mechanism 200 is located above the rotating shaft system 400. A terminal block 760 is also provided on the side of the arc-extinguishing chamber 500 away from the rotating shaft system 400. The terminal block 760 is integrally formed with the stationary contact 420 below the arc-extinguishing chamber 500. Another terminal block 760 electrically connected to the thermal-magnetic trip unit 700 is provided on the side of the thermal-magnetic trip unit 700 away from the rotating shaft system 400.

[0056] like Figures 6-8 As shown, the thermomagnetic trip unit 700 includes a bimetallic strip 710, a second bracket 720 fixed on the base 110 of the housing 100, a magnetic yoke 730 fixed on the second bracket 720, an armature 740 rotatably mounted on the second bracket 720, and an armature spring (not shown) disposed between the second bracket 720 and the armature 740. One end of the bimetallic strip 710 is fixed, and an actuating element 711 is provided on the other end. When the circuit breaker is overloaded, the bimetallic strip 710 can be bent by heat, causing the actuating element 711 to drive the traction rod 300 to rotate and thus disengage the operating mechanism 200. The armature 740 and the magnetic yoke 730 are spaced apart and opposite to each other, forming a through cavity between them. When the circuit breaker is short-circuited, the armature 740 can overcome the elastic force of the armature spring and attract the magnetic yoke 730. At the same time, the armature 740 drives the traction rod 300 to rotate and thus disengage the operating mechanism 200. The traction rod 300 includes a traction rod body 310 rotatably mounted on a first bracket of the operating mechanism 200. The traction rod body 310 extends downward on the side facing the pneumatic mechanism and has a first driven arm 320. The traction rod body 310 extends downward on the side facing the thermomagnetic trip unit 700 and has a second driven arm 330 extending upward, and has a positioning plate 340 with a sliding groove 341.

[0057] It should be noted that one end of the bimetallic strip 710 is fixed to the base 110 of the housing 100 via a connecting plate 750. One end of the connecting plate 750 passes through the cavity and is welded to one end of the bimetallic strip 710. The other end of the connecting plate 750 is also connected to the terminal block 760 via a flexible connection. Figure 2One end of the terminal block 760 is electrically connected, and the other end of the terminal block 760 is used for external connection. The other end of the connecting plate 750 is fixed on the base 110 of the housing 100 and electrically connected to the moving contact 410 through the wire 770. The two ends of the wire 770 are respectively welded to the connecting plate 750 and the moving contact 410.

[0058] In a preferred embodiment of the thermal magnetic trip unit 700, the second bracket 720 of the thermal magnetic trip unit 700 has a U-shaped structure, and a mounting arm extends upward from one side of the second bracket 720. The armature 740 is rotatably mounted on the outer sides of both sides of the second bracket 720. The magnetic yoke 730 is a U-shaped structure fixed inside the opening of the second bracket 720. The bottom edge of the magnetic yoke 730 is riveted and fixed to the bottom edge of the second bracket 720. The opening of the magnetic yoke 730 is opposite to the armature 740. The two sides of the magnetic yoke 730 have inclined attraction surfaces.

[0059] like Figure 6 , Figure 7 and Figure 9 As shown, the protection mechanism of this embodiment also includes a magnetic adjustment assembly 800. The magnetic adjustment assembly 800 includes a magnetic adjustment knob 810, a magnetic adjustment rod 820, and a transmission rod 830, which are respectively rotatably disposed, and a second spring 840 disposed between the magnetic adjustment rod 820 and the transmission rod 830. The magnetic adjustment knob 810 is driven to cooperate with the magnetic adjustment rod 820. The magnetic adjustment rod 820 and the transmission rod 830 are connected by the second spring 840. The transmission rod 830 abuts against the armature 740. The rotation of the magnetic adjustment knob 810 can drive the magnetic adjustment rod 820 to rotate, thereby adjusting the deformation of the second spring 840. By adjusting the deformation of the second spring 840, the force exerted by the transmission rod 830 on the armature 740 is adjusted, thereby realizing the magnetic adjustment function.

[0060] like Figure 9 As shown, the magnetic adjustment knob 810 and magnetic adjustment rod 820 can be implemented in various ways. One possible implementation is that the magnetic adjustment knob 810 has a helical surface 811, and the magnetic adjustment rod 820 includes a magnetic adjustment rod body 821. The magnetic adjustment rod body 821 is a rotatable circular shaft structure. The magnetic adjustment rod body 821 extends with an adjustment arm 822 resting on the helical surface 811 and a first connecting arm 823 connected to the second spring 840. When the magnetic adjustment knob 810 rotates, the helical surface 811 acts on the adjustment arm 822, causing the magnetic adjustment rod 820 to rotate, thereby adjusting the deformation of the second spring 840 and achieving the magnetic adjustment function. Of course, the magnetic adjustment knob 810 and magnetic adjustment rod 820 can also adopt other existing structures.

[0061] like Figure 7As shown, the armature 740 includes an attraction part 741 for engaging with the attraction surface of the magnetic yoke 730. The two sides of the attraction part 741 are respectively provided with a second release arm 742 that abuts against the second driven arm 330 of the traction rod 300 and an armature rotating arm 743 that is rotatably connected to the second bracket 720. The transmission rod 830 includes a transmission rod body 831, which is a ring structure with a notch and is rotatably sleeved on the mounting arm of the second bracket 720. The two sides of the transmission rod body 831 are respectively provided with a second connecting arm 832 that is connected to the second spring 840 and a transmission arm 833 that extends into the through cavity and abuts against the attraction part 741.

[0062] like Figure 6 , Figure 7 and Figure 9 As shown, the magnetic adjustment assembly 800 also includes a magnetic adjustment screw 860. The magnetic adjustment screw 860 is disposed opposite to the second connecting arm 832 of the transmission rod 830. By rotating the magnetic adjustment screw 860, the transmission rod 830 is rotated by pushing the second connecting arm 832. This causes the transmission arm 833 to push the attraction part 741, causing the armature 740 to rotate, thereby adjusting the distance between the armature 740 and the magnetic yoke 730 to achieve the magnetic adjustment function.

[0063] like Figure 6 , Figure 9 and Figure 10 As shown, the protection mechanism of this embodiment also includes a heat adjustment assembly 900. The heat adjustment assembly 900 includes a rotatable heat adjustment knob 910 and a heat adjustment plate 920 disposed on the traction rod 300. The heat adjustment plate 920 rotates synchronously with the traction rod 300 and can slide along the rotation axis of the traction rod 300. The actuating element 711 drives the traction rod 300 to rotate through the heat adjustment plate 920. The heat adjustment knob 910 adjusts the distance between the actuating element 711 and the heat adjustment plate 920 by adjusting the displacement of the heat adjustment plate 920 in the rotation axis direction of the traction rod 300.

[0064] The heat adjustment plate 920 has a first stop plane 921, an adjustment slope 922, and a second stop plane 923 connected in sequence on the side facing the actuator 711. The other side of the heat adjustment plate 920 has a protruding sliding column 924. The other side of the heat adjustment plate 920 is attached to the positioning plate 340 of the traction rod 300, and the sliding column 924 is slidably inserted into the slide groove 341 of the traction rod 300.

[0065] The driving structure between the heat adjustment knob 910 and the heat adjustment plate 920 can be implemented in various ways. One possible implementation is that the heat adjustment plate 920 has a protruding adjustment protrusion 925 on the side facing the actuating member 711, and the adjustment protrusion 925 has an adjustment groove 926. The heat adjustment knob 910 has an eccentric post 911 inserted into the adjustment groove 926. Rotation of the heat adjustment knob 910 causes the heat adjustment plate 920 to slide via the eccentric post 911, thereby adjusting the distance between the heat adjustment plate 920 and the actuating member 711 via the adjusting inclined surface 922, thus achieving the heat adjustment function. Of course, other existing structures can also be used for the driving structure between the heat adjustment knob 910 and the heat adjustment plate 920.

[0066] The magnetic adjustment assembly 800 also includes a third bracket 850. One side of the third bracket 850 has a first rotating groove that rotatably engages with the magnetic adjustment rod body 821. The other side of the third bracket 850 has a second rotating groove for rotatably mounting the magnetic adjustment knob 810 and a third rotating groove for rotatably mounting the heat adjustment knob 910. Alternatively, in other embodiments, the third bracket 850 may be omitted, with the magnetic adjustment rod 820 rotatably mounted on the base 110, and the magnetic adjustment knob 810 and heat adjustment knob 910 rotatably mounted on the middle cover 120, respectively.

[0067] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0068] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A circuit breaker comprising a housing (100), an operating mechanism (200), a traction rod (300), a protection mechanism and at least one rotating shaft system (400) installed in the housing (100), and a static contact (420) and an arc extinguishing chamber (500) corresponding to the rotating shaft system (400) respectively, the rotating shaft system (400) comprising a moving contact (410), the operating mechanism (200) being capable of driving the rotating shaft system (400) to make the moving contact (410) contact or separate from the corresponding static contact (420); the protection mechanism comprising at least one gas blowing mechanism (600), the gas blowing mechanism (600) comprising a sealed shell (610), a push rod (620) and a first spring (630) for driving the push rod (620) to retract into the sealed shell (610), the sealed shell (610) being provided with an air inlet hole (611) on at least one side, the arc extinguishing chamber (500) being provided with an air outlet hole (501) corresponding to the air inlet hole (611); the push rod (620) being slidingly arranged in the sealed shell (610), the push rod (620) being capable of sliding in the direction of extending out of the sealed shell (610) under the action of gas pressure in the sealed shell (610) to drive the traction rod (300) to rotate and make the operating mechanism (200) trip. characterized in that The rotating shaft system (400), the static contact (420) and the arc extinguishing chamber (500) are arranged at intervals along the width direction of the circuit breaker, the operating mechanism (200) is located above the rotating shaft system (400), the arc extinguishing chamber (500) is located above the static contact (420), and the arc extinguishing chamber (500) is located on one side of the operating mechanism (200) in the length direction of the circuit breaker, the traction rod (300) is rotatably arranged on the other side of the operating mechanism (200), the length direction of the gas blowing mechanism (600) is arranged along the length direction of the circuit breaker, one end of the length direction of the gas blowing mechanism (600) is located between the adjacent two arc extinguishing chambers (500), and the other end of the length direction of the gas blowing mechanism (600) is arranged opposite to the traction rod (300), and the sliding direction of the push rod (620) of the gas blowing mechanism (600) is arranged along the length direction of the circuit breaker.

2. The circuit breaker of claim 1, wherein: The gas blowing mechanism (600) passes through the traction rod (300) from above the rotating shaft system (400) and from the side of the operating mechanism (200), and the operating mechanism (200) is located between at least two gas blowing mechanisms (600) in the width direction of the circuit breaker.

3. The circuit breaker of claim 1, wherein: The push rod (620) comprises a push rod body (620a) slidingly arranged in the sealed shell (610) and a push rod extension (620b) extending out of the sealed shell (610), the traction rod (300) comprises a first driven arm (320) arranged corresponding to the push rod extension (620b) of the gas blowing mechanism (600); the push rod (620) is capable of sliding in the direction of extending out of the sealed shell (610) under the action of gas pressure in the sealed shell (610) to make the push rod extension (620b) push against the first driven arm (320).

4. The circuit breaker of claim 3, wherein: The sealing shell (610) is provided with a sliding cavity (612) in sliding fit with the push rod body (620a) and a buffer cavity (613) communicated between the sliding cavity (612) and the air inlet hole (611), and the buffer cavity (613) is provided with a blocking sheet (640) covering the air inlet hole (611) and used for blocking the metal particles from entering the sealing shell (610).

5. The circuit breaker of claim 4, wherein: The buffer cavity (613) is provided with a slot (614), and the blocking sheet (640) is an L-shaped paper sheet, one end of the blocking sheet (640) is fixed in the slot (614), and the other end covers the air inlet hole (611).

6. The circuit breaker of claim 4, wherein: The buffer cavity (613) is provided with a flow guide convex rib (615), and the flow guide convex rib (615) is located between the air inlet hole (611) and the sliding cavity (612).

7. The circuit breaker of claim 4, wherein: The sealing shell (610) is provided with the air inlet hole (611) on both sides, the buffer cavity (613) is provided with a separation convex rib (616), the separation convex rib (616) is located between the two air inlet holes (611) and separates the buffer cavity (613) into two separated chambers.

8. The circuit breaker of claim 3, wherein: The first spring (630) is arranged between the outer side of the sealing shell (610) and the push rod extension (620b).

9. The circuit breaker of claim 8, wherein: The sealing shell (610) is provided with a containing cavity (617) at one end away from the air inlet hole (611), the first spring (630) and the push rod extension (620b) are arranged in the containing cavity (617) respectively, the first spring (630) is a compression spring, and the push rod extension (620b) comprises a first trip arm (623) extending out of the containing cavity (617) and used for abutting against the first driven arm (320).

10. The circuit breaker of claim 9, wherein: The containing cavity (617) has a first side wall (618) and a second side wall (619) arranged in sequence and spaced apart along the direction in which the push rod (620) extends out of the sealing shell (610), the push rod extension (620b) further comprises a limiting rod (624) and a mounting rod (625), one end of the push rod body (620a) penetrates through the first side wall (618), the limiting rod (624) is an L-shaped structure with an opening facing the second side wall (619), one end of the limiting rod (624) is connected to one end of the push rod body (620a) on the outer side, the mounting rod (625) is arranged along the sliding direction of the push rod (620) in the length direction, one end of the mounting rod (625) penetrates through the second side wall (619), the other end of the mounting rod (625) is connected to one end of the limiting rod (624) on the inner side, and the other end of the limiting rod (624) extends in a direction away from the mounting rod (625) and is provided with the first trip arm (623); the first spring (630) is sleeved on the mounting rod (625) and abuts against the second side wall (619) and one end of the limiting rod (624) on the inner side at two ends respectively.

11. The circuit breaker of claim 3, wherein: The push rod body (620a) comprises a longitudinal rod (621) and a transverse rod (622) connected in T shape, the length direction of the transverse rod (622) is arranged along the sliding direction of the push rod (620), and the end of the transverse rod (622) away from the longitudinal rod (621) is connected with the push rod extension (620b); the air inlet hole (611) is located on the side of the longitudinal rod (621) away from the transverse rod (622).

12. The circuit breaker of claim 1, wherein: The protection mechanism further comprises a thermal magnetic trip (700) and a magnetic adjustment assembly (800), the magnetic adjustment assembly (800) comprises a magnetic adjustment knob (810), a magnetic adjustment rod (820) and a transmission rod (830) rotatably arranged respectively, and a second spring (840) arranged between the magnetic adjustment rod (820) and the transmission rod (830), the thermal magnetic trip (700) comprises a second bracket (720) fixed on the shell (100), a magnetic yoke (730) fixed on the second bracket (720), an armature (740) rotatably arranged on the second bracket (720), and an armature spring arranged between the second bracket (720) and the armature (740), the magnetic adjustment knob (810) and the magnetic adjustment rod (820) are drivingly matched, the transmission rod (830) is in abutment with the armature (740), and rotation of the magnetic adjustment knob (810) can drive the magnetic adjustment rod (820) to rotate, so as to adjust the deformation amount of the second spring (840).

13. The circuit breaker of claim 12, wherein: The armature (740) comprises an attraction part (741) for attracting the attraction surface of the magnetic yoke (730), second trip arms (742) in abutment with the second driven arms (330) of the traction rod (300) and armature rotating arms (743) rotatably connected to the second bracket (720) are arranged on both sides of the attraction part (741), the transmission rod (830) comprises a transmission rod body (831), and second connecting arms (832) connected with the second spring (840) and transmission arms (833) in abutment with the attraction part (741) are arranged on both sides of the transmission rod body (831).

14. The circuit breaker of claim 13, wherein: The magnetic adjustment assembly (800) further comprises a magnetic adjustment screw (860), the magnetic adjustment screw (860) is arranged opposite to the second connecting arm (832) of the transmission rod (830), the transmission rod (830) is rotated by rotating the magnetic adjustment screw (860) to push the second connecting arm (832), so that the transmission arm (833) pushes the attraction part (741) to rotate the armature (740), thereby adjusting the distance between the armature (740) and the magnetic yoke (730).

15. The circuit breaker of claim 1, wherein: The protection mechanism further comprises a thermal magnetic trip (700) and a thermal adjustment assembly (900), the thermal adjustment assembly (900) comprising a rotationally arranged thermal adjustment knob (910) and a thermal adjustment plate (920) arranged on the traction rod (300), the thermal adjustment plate (920) being rotationally synchronous with the traction rod (300) and being capable of sliding along the rotation axis of the traction rod (300), the thermal magnetic trip (700) comprising a bimetallic strip (710), one end of the bimetallic strip (710) being fixed and the other end being provided with a trigger (711), the trigger (711) driving the traction rod (300) to rotate through the thermal adjustment plate (920), the thermal adjustment knob (910) adjusting the distance between the trigger (711) and the thermal adjustment plate (920) by adjusting the displacement of the thermal adjustment plate (920) along the rotation axis of the traction rod (300).

16. The circuit breaker of claim 15, wherein: The side of the thermal adjustment plate (920) facing the trigger (711) is provided with a first gear plane (921), an adjustment inclined plane (922) and a second gear plane (923) connected in sequence, and the other side of the thermal adjustment plate (920) is provided with a sliding column (924) protruding, the sliding column (924) being slidingly inserted into the sliding groove (341) of the traction rod (300).

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