A circuit breaker

Abstract

A kind of circuit breaker, including shell, handle, first connecting rod, jump buckle, lock catch, second connecting rod, lever, movable contact and static contact, the jump buckle and lock catch are respectively pivotally installed on shell, the jump buckle is equipped with sliding slot and is used to with the snap of lock catch Snaps with the jump buckle snap part;The handle is pivotally installed on shell, one end of the first connecting rod is connected with handle, the other end of first connecting rod is hinged with one end of second connecting rod, the other end of second connecting rod is connected with lever, the hinged end of first connecting rod and second connecting rod with the sliding slot of the jump buckle sliding fit;The lever is pivotally installed on shell, one end of the movable contact is installed on lever, the other end of movable contact is correspondingly arranged with static contact.The application provides a kind of compact structure, operation reliability is high circuit breaker.

Description

Technical Field

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

[0002] With economic development, miniaturization and intelligence have become the development trend of low-voltage electrical components. The expectation is that electrical products can have multiple functions within a small size to meet various application needs. The operating mechanism is the most basic functional module inside an electrical product, occupying a large proportion of the overall structural layout. Miniaturization and compactness of the operating mechanism is a major direction for achieving miniaturization and intelligence in electrical products. Most existing circuit breaker products use a four-bar operating mechanism, resulting in a dispersed component layout, fragmented use of limited space, and ineffective utilization, thus limiting the multi-functional development of the product. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a circuit breaker with a compact structure and high operational reliability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A circuit breaker includes a housing, a handle, a first link, a trip latch, a latch, a second link, a lever, a moving contact, and a stationary contact. The trip latch and the latch are pivotally mounted on the housing. The trip latch has a sliding groove and a trip latch latching part for engaging with the latching platform of the latch. The handle is pivotally mounted on the housing. One end of the first link is connected to the handle, and the other end of the first link is hinged to one end of the second link. The other end of the second link is connected to the lever. The hinged ends of the first and second links slide in engagement with the sliding groove of the trip latch. The lever is pivotally mounted on the housing. One end of the moving contact is mounted on the lever, and the other end of the moving contact is correspondingly positioned opposite the stationary contact.

[0006] Preferably, the handle is rotatably mounted via a first pivot, the latch is rotatably mounted via a third pivot, one end of the snap fastener is rotatably mounted via a second pivot, and the buckle edge at the other end engages with the latch. The first pivot, the third pivot, and the second pivot are located at the three vertices of an obtuse triangle, wherein the first pivot is located at the obtuse vertex of the obtuse triangle.

[0007] Preferably, one end of the jump buckle is rotatably mounted, and the other end is provided with a jump buckle latch part that cooperates with the locking latch. The sliding groove is disposed between the rotation axis of the jump buckle and the jump buckle latch part. One end of the locking latch is rotatably mounted, and the other end is provided with a release drive part for triggering release. The locking latch is provided with a sliding surface that slides with the jump buckle latch part of the jump buckle. The sliding surface is provided with a protruding latch platform that latches with the jump buckle latch part.

[0008] Preferably, the latch and the lever are arranged on the same axis of rotation, the lever is rotatably fitted onto the third axis of the housing through the third axis hole thereon, and a lever elastic element for lever reset is provided between the lever and the housing. The latch is rotatably fitted onto the third axis of the housing through the fourth axis hole thereon, and a latch elastic element for latch reset is provided between the latch and the housing.

[0009] Preferably, when the circuit breaker is in the closed state, the sliding groove of the trip buckle is subjected to a pressure of F1 at the hinge end of the first link and the second link, with a lever arm of L1, and the trip buckle latch part of the trip buckle is subjected to a normal pressure of F2 at the latching platform of the lock, with a lever arm of L2, wherein the length ratio of the lever arm L1 to L2 is less than 1 / 4.

[0010] Preferably, the jump buckle includes a jump buckle rotating part, a sliding groove section, and a jump buckle hook arm connected in sequence. The jump buckle rotating part is provided with a second shaft hole, the sliding groove section is provided with a sliding groove, the end corner of the jump buckle hook arm is provided with a protruding hook hook, and the end face of the jump buckle hook arm is provided with a protruding sliding arc surface that slides with the lock. The part where the sliding arc surface meets the hook hook is a hook edge that can engage with the hook platform of the lock.

[0011] Preferably, the line connecting the rotation axis of the snap fastener to the center O of the sliding arc surface is L3, and the line connecting the rotation axis of the snap fastener to the edge of the buckle is L4. The line L3 and L4 have an angle α, where α is an acute angle, and the length of the line L3 is greater than the length of the line L4.

[0012] Preferably, one end of the latch is provided with a fourth shaft hole, and the bottom surface of the other end of the latch is provided with a downwardly protruding release drive part; the bottom surface of the middle part of the latch near the fourth shaft hole is provided with a downwardly protruding latch protrusion, and a clearance groove for avoiding the second link is formed between the latch protrusion and the release drive part; the latch protrusion is provided with a guide protrusion protruding to the side as a sliding surface for cooperating with the jump buckle; the side of the latch protrusion is provided with a buckle platform for cooperating with the jump buckle; and the guide protrusion is spaced apart from the bottom surface of the latch.

[0013] Preferably, the bottom surface of the latch is provided with a downwardly protruding linkage shaft, and the top surface of the latch is provided with a linkage groove at a position corresponding to the linkage shaft.

[0014] Preferably, the second connecting rod includes two connecting rod pieces and a connecting rib connecting the two connecting rod pieces. The two connecting rod pieces have a snap-fit ​​gap to avoid the jump buckle and / or lock buckle. One end of the two connecting rod pieces is provided with a second hinge hole for hinged with the first connecting rod, and the other end of the two connecting rod pieces is provided with a third hinge hole for hinged with the lever.

[0015] Preferably, the moving contact is pivotally mounted on the lever, and the moving contact is rotatably connected to the lever; and a third torsion spring is provided at the connection between the moving contact and the lever, with one leg of the third torsion spring abutting against the lever and the other leg abutting against the moving contact.

[0016] Preferably, the moving contact is provided with a stop protrusion, and the lever is provided with a stop boss corresponding to the stop protrusion.

[0017] Preferably, the lever includes a lever plate and a support boss disposed on the lever plate. The support boss is provided with a fourth pivot for pivotal mounting of the moving contact. One corner of the lever plate extends outward to form an extension. The extension has a limiting inclined surface on one side at the connection with the lever plate for engaging with the limiting cylinder of the housing, and a fourth hinge hole on the other side for hinged with the second connecting rod. The end of the extension has a third shaft hole for pivotal mounting of the lever.

[0018] Preferably, the first connecting rod is a U-shaped rod, one end of which is hinged to the first hinge hole of the handle, and the other end of which is hinged to the second hinge hole of the second connecting rod and inserted into the slide groove of the jump buckle.

[0019] The circuit breaker created by this invention has a compact and small structure, occupies a concentrated space and has a small proportion. The operating mechanism makes full use of the limited internal space, and can integrate more functional modules within the limited internal space of the product to realize more functions of the product. Attached Figure Description

[0020] Figure 1 This is a perspective view of the circuit breaker in the open state as described in this invention;

[0021] Figure 2 This is a front view of the circuit breaker in the open state as described in this invention;

[0022] Figure 3 This is a partial structural anatomical diagram of the circuit breaker where the trip latch and locking latch separate when the circuit breaker contacts are in the open position, as described in this invention.

[0023] Figure 4 This is a perspective view of the circuit breaker of the present invention in the closed state;

[0024] Figure 5 This is a front view of the circuit breaker in the closed state as described in this invention;

[0025] Figure 6 This is a partial structural anatomical diagram of the trip latch and locking latch engaging when the circuit breaker contacts are in the closed position, as described in this invention.

[0026] Figure 7 This is a partial structural anatomical diagram of the circuit breaker in the tripping process state one of the invention.

[0027] Figure 8 This is a partial structural anatomical diagram of the circuit breaker in the second tripping process state created by the present invention;

[0028] Figure 9 This is a partial structural anatomical diagram of the circuit breaker in the tripping process state three of the present invention.

[0029] Figure 10 This is a perspective view of the circuit breaker in state three of the tripping process, as described in this invention.

[0030] Figure 11 This is a schematic diagram of the base structure of the housing created in this invention;

[0031] Figure 12 This is a schematic diagram of the structure of the handle of this invention;

[0032] Figure 13 This is a three-dimensional view of the jump hook created by this invention;

[0033] Figure 14 This is a front view of the snap fastener created by this invention;

[0034] Figure 15 This is a front perspective view of the latch created by the present invention;

[0035] Figure 16 This is a perspective view of the reverse side of the latch created in this invention;

[0036] Figure 17 This is a perspective view of the connecting rod created in this invention;

[0037] Figure 18 This is a perspective view of the lever created by the present invention;

[0038] Figure 19 This is a schematic diagram of the structure of the moving contact created in this invention. Detailed Implementation

[0039] The following is in conjunction with the appendix Figures 1 to 19 The given embodiments further illustrate specific implementations of the circuit breaker created by the present invention. The circuit breaker created by the present invention is not limited to the descriptions of the following embodiments.

[0040] like Figure 1-10As shown, the circuit breaker of this invention includes a housing 1, an operating mechanism, a moving contact 8, a stationary contact 9, and a trip unit 101. The operating mechanism includes a handle 2, a first connecting rod 3, a trip latch 4, a locking latch 5, a second connecting rod 7, and a lever 6. The trip latch 4 and the locking latch 5 are pivotally mounted on the base plate of the housing 1. The locking latch 5 is provided with a tripping drive part 56 corresponding to the trip unit 101. The trip latch 4 is provided with a sliding groove 42 and a trip latch latching part for engaging with the latching platform 53 of the locking latch 5. In this embodiment, the trip latch latching part is a latching edge 43 for engaging with the latching platform 53 of the locking latch 5. The handle 2 is pivotally mounted on the base plate of the housing 1. One end of the first connecting rod 3 is connected to the handle 2, and the other end of the first connecting rod 3 is hinged to one end of the second connecting rod 7. The other end of the second connecting rod 7 is connected to the lever 6. The hinged ends of the first connecting rod 3 and the second connecting rod 7 are inserted into the groove 42 of the jump buckle 4 and slide along the groove 42. The lever 6 is pivotally mounted on the housing 1, and one end of the moving contact 8 is mounted on the lever 6. The other end of the moving contact 8 is correspondingly arranged with the stationary contact 9. The circuit breaker created by this invention is a cam-five-bar linkage mechanism composed of the jump buckle 4 with the groove 42, the housing 1, the handle 2, the first connecting rod 3, the second connecting rod 7, and the lever 6. The five-bar linkage, consisting of housing 1, handle 2, first link 3, second link 7, and lever 6, has two degrees of freedom. One end of the first link 3 and the hinged end of the second link 7 are then restricted to move on a cam formed by a fixed slide groove 42, thus restricting one degree of freedom. This constitutes a cam-five-bar linkage transmission mechanism with one degree of freedom. The release mechanism, composed of the trip latch and the locking latch, is essentially separate and independent from the transmission mechanism. This ensures that the release mechanism remains essentially stationary during normal closing and opening operations, greatly improving the overall operational reliability of the mechanism.

[0041] Preferably, in this embodiment, the handle 2 is rotatably mounted via a first pivot 12, the latch 5 is rotatably mounted via a third pivot 14, and one end of the snap fastener 4 is rotatably mounted via a second pivot 11, with the other end's snap edge 43 engaging with the latch 5. The first pivot 12, the third pivot 14, and the second pivot 11 are located at the three vertices of an obtuse triangle, wherein the first pivot 12 is located at the obtuse vertex of the obtuse triangle. The lever 6 is rotatably mounted via the third pivot 14, forming a movable quadrilateral with the hinged end of the lever 6 and the second connecting rod 7 as the movable vertex and the first pivot 12, the second pivot 11, and the third pivot 14 as the fixed vertex. The first pivot 12 and the third pivot 14 are located at the two obtuse vertices of the common side of the movable quadrilateral, and the hinged end of the lever 6 and the second connecting rod 7, and the second pivot 11 are located at the two acute vertices of the common side of the movable quadrilateral. It should be noted that the obtuse angle feature, acute angle feature, triangle, and the order of the vertices of the triangle in this embodiment are only one embodiment and cannot represent all other embodiments, nor can they limit the maximum scope of protection of this case. The obtuse triangle and the movable quadrilateral are not actually connected; they are merely assumed shapes for the convenience of describing the relative positions between the handle 2, the snap 4, the latch 5, the lever 6, and the second link 7. Specifically, as... Figure 1-10 As shown, one end of the trip buckle 4 is rotatably mounted on the lower side of the handle 2, located between the handle 2 and the trip unit 101. The latch 5 and lever 6 are rotatably mounted on the other side of the handle 2. The other end of the trip buckle 4 extends horizontally from the lower side of the handle 2 to the other side of the handle 2 and engages with the latch 5. The second connecting rod 7 is horizontally positioned below the handle 2, located between the handle 2 and the trip unit 101. One end of the second connecting rod 7 is hinged to the first connecting rod 3 and slides along the slide groove 42, while the other end is connected to the lever 6. By setting the trip buckle 4 and latch 5 on both sides of the handle 2, the space between the handle 2 and the trip unit 101 is fully utilized, and the lever arm L2 of the tripping force is effectively expanded. The circuit breaker created by this invention has a compact and small structure, a reasonable layout, and occupies a concentrated and small proportion of space. The operating mechanism makes full use of the limited internal space and can integrate more functional modules within the limited internal space of the product to realize more functions of the product.

[0042] In this embodiment, the trip unit 101 is an electromagnetic trip unit. When the circuit breaker is short-circuited, it can trigger the latch 5, releasing the latch 5 and the trip latch 4, causing the circuit breaker to trip and disconnect, thus achieving circuit protection. The trip unit 101 is connected to the stationary contact 9. An arc-extinguishing chamber can also be provided below the trip unit 101. Wiring terminals are also provided on both sides of the circuit breaker, with the stationary contact 9 located above the entrance side of the arc-extinguishing chamber. Of course, the trip unit 101 can also be a residual current trip unit or an overload trip unit. As needed, an electromagnetic trip unit, a residual current trip unit, or an overload trip unit can also be installed inside the circuit breaker to drive the latch 5 when the circuit breaker fails. This is prior art in the field and will not be described in detail further.

[0043] like Figure 11 As shown, the housing 1 created by this invention includes a matching and snap-fit ​​top cover (not shown) and a base. The base plate of the housing 1 is provided with a first pivot 12 for pivoting the handle 2, a second pivot 11 for pivoting the snap 4, a third pivot 14 for pivoting the lever 6 and the latch 5, a first abutment boss 13, and a limiting cylinder 15. In this embodiment, the latch 5 and the lever 6 are coaxially rotatably mounted on the third pivot 14 and are stacked to save space; of course, the pivot axes of the latch 5 and the lever 6 can also be different.

[0044] like Figure 12 As shown, the handle 2 of this invention includes an integrally connected hand-held portion 21 and a rotating portion 22. The hand-held portion 21 at one end of the handle 2 extends out of the housing 1 for operation, while the rotating portion 22 at the other end has a first shaft hole 23 for pivotal mounting on the housing 1 and a first hinge hole 24 for hinged connection with the first connecting rod 3. The handle 2 is rotatably fitted onto the first rotating shaft 12 of the housing 1 through the first shaft hole 23 on its rotating portion 22. A fourth torsion spring for resetting the handle 2 is installed at the pivot connection between the handle 2 and the housing 1. One leg of the fourth torsion spring abuts against the housing 1, and the other leg abuts against the handle 2. The two ends of the rotation stroke of the handle 2 cooperate with the operating stop members of the housing 1 to limit the stroke of the handle 2. Figure 2 As shown, when the circuit breaker is in the open state, the handheld portion 21 of the handle 2 is blocked by the operating stop member of the housing 1 at the left end; as Figure 5 As shown, when the circuit breaker is in the closed state, the hand-held part 21 of the handle 2 is blocked by the operating stop of the housing 1 on the right end.

[0045] In this embodiment, the first connecting rod 3 is a U-shaped rod. One end of the U-shaped rod is hinged to the first hinge hole 24 of the handle 2, and the other end of the U-shaped rod is hinged to the second hinge hole 71 of the second connecting rod 7 and inserted into the slide groove 42 of the jump buckle 4. The end of the U-shaped rod connected to the second connecting rod 7 is directly used as the hinge shaft inserted into the slide groove 42. The structure is simple and easy to assemble.

[0046] like Figure 13-14 As shown, the snap fastener 4 of this invention is an integrally molded structure, including a snap fastener rotating part 401, a sliding section 402, and a snap fastener hook arm 403 connected in sequence. The snap fastener rotating part 401 is cylindrical, the sliding section 402 is square, and the snap fastener hook arm 403 is L-shaped. The sliding section 402 and the snap fastener hook arm 403 are bent and connected. The snap fastener hook arm is slightly inclined downward away from the handle 2. The sliding section 402 and the snap fastener hook arm 403 can cooperate with the locking gap 75 of the second connecting rod 7. The sliding section 402 and the snap fastener hook... The top and bottom surfaces of the latch arm 403 are flush. The snap-lock rotating part 401 protrudes from the top surface of the slide section 402. The snap-lock rotating part 401 has a notch to avoid the second connecting rod 7. The snap-lock rotating part 401 has a second shaft hole 41, through which the snap-lock 4 is rotatably fitted onto the second rotating shaft 11 of the housing 1. The slide section 402 has a slide groove 42. Preferably, the slide groove 42 is an elongated waist-shaped hole. The slide groove 42 is a straight slide groove that is slightly inclined from the rotation axis of the snap-lock 4 towards the upper part of the handle 2. Preferably, the outer corner of the L-shaped snap-lock arm 403 has a protruding snap hook. The end face of the snap-lock arm 403 has a protruding sliding arc surface 44 that slides with the latch 5. The junction of the sliding arc surface 44 and the snap hook is a snap edge 43 that can engage with the snap platform 53 of the latch 5.

[0047] like Figure 14 As shown, the point where the line connecting the center O of the sliding arc surface 44 where the hook edge 43 is located and the rotation axis of the snap 4 intersects the sliding arc surface 44 is the position of the sliding arc surface 44 where the hook edge 43 is located furthest from the rotation axis of the snap 4, and is located above the hook, forming a cam. That is, the line connecting the rotation axis of the snap 4 through the center O of the sliding arc surface 44 where the hook edge 43 is located to the sliding arc surface 44 is L3, and the line connecting the rotation axis of the snap 4 to the hook edge 43 is L4. There is an angle α between the connecting lines L3 and L4. α is an acute angle and a small angle. Under the condition that the lengths of L3 and L4 remain unchanged, the smaller the angle α, the faster the snap 5 rotates, and the length of the connecting line L3 is greater than the length of the connecting line L4.

[0048] like Figure 7 As shown, when the jump buckle 4 disengages from the latch 5, the operating mechanism transforms into a five-bar linkage (excluding the jump buckle 4) consisting of the housing 1, handle 2, first link 3, second link 7, and lever 6. This five-bar linkage has two degrees of freedom. Lever 6 rotates counterclockwise under the action of the first torsion spring 102, thereby driving the second link 7 and the first link 3 to move. The jump buckle 4 is pulled by the second link 7 to rotate rapidly around the second pivot 11. Figure 8 As shown, the sliding arc surface 44 of the latch 4 follows the guide protrusion 54 of the latch 5, which serves as the sliding surface. Figure 16 The tangential sliding motion pushes the latch 5 to rotate. The rotation angle of the latch 5 is determined by the difference between the lines L3 and L4 connecting the latch 4, and is directly proportional to the difference between the lines L3 and L4. Figure 9-10 As shown, when the line connecting the first shaft hole 23 and the first hinge hole 24 of the handle 2 turns into a straight line with the straight line where the main body of the first connecting rod 3 is located, the jump buckle 4 rotates through the maximum angle. At this time, the tip feature 45 of the jump buckle 4 cannot exceed the surface where the guide protrusion 54 of the lock buckle 5 is located, so as to prevent the lock buckle 5 from jamming the jump buckle 4 and preventing the jump buckle 4 from resetting. When lever 6 moves to the disengaged state, that is, the limiting inclined surface 64 of lever 6 abuts against the limiting cylinder 15 of housing 1. At this time, lever 6 is stationary due to the support of the limiting cylinder 15 of housing 1. Handle 2, first link 3, second link 7, and housing 1 form a four-bar linkage mechanism. Handle 2 rotates counterclockwise under the action of the fourth torsion spring, thereby driving the first link 3 and second link 7 to move. The first link 3 drives the jump buckle 4 to rotate counterclockwise through the sliding groove 42 of the jump buckle 4. When handle 2 is turned to the disengaged position, the sliding arc surface 44 of jump buckle 4 returns to its original position along the guide protrusion 54 of lock buckle 5. At this time, the latch edge 43 of jump buckle 4 is on the upper side of the latch platform 53 of lock buckle 5, preparing for the re-locking of the release mechanism.

[0049] like Figure 15-16As shown, one end of the latch 5 of this invention is provided with a fourth shaft hole 51. The latch 5 is rotatably fitted onto the third rotating shaft 14 of the housing 1 through the fourth shaft hole 51. The bottom surface of the other end of the latch 5 is provided with a downwardly protruding tripping drive part 56, which is correspondingly arranged with the pin of the tripping device 101 of the circuit breaker. Located on the side of the release device 101; the bottom surface of the middle part of the latch 5 near the fourth shaft hole 51 is provided with a downward protruding latch protrusion 50. A clearance groove is formed between the latch protrusion 50 and the release drive part 56 to avoid the second connecting rod 7. The latch protrusion 50 is provided with a downward protruding linkage shaft 52 and a side protruding guide protrusion 54 as a sliding surface to cooperate with the jump buckle 4. The side of the latch protrusion 50 is provided with a latch platform 53, which can be fastened with the latch edge 43 of the jump buckle 4. The guide protrusion 54 is spaced apart from the bottom surface of the latch 5 so as not to avoid the second connecting rod 7. The guide protrusion 54 can extend into the snap gap 75 of the second connecting rod 7. The top surface of the latch 5 is provided with a linkage groove 55 at the position corresponding to the linkage shaft 52. One side of the latch 5 is provided with a linkage shaft 52, which can be inserted into the linkage slot 55 of an adjacent circuit breaker. The other side of the latch 5 is provided with a linkage slot 55, into which the linkage shaft 52 of another adjacent circuit breaker can be inserted. The latch 5 can be linked with the operating mechanisms of the two adjacent circuit breakers through its linkage shaft 52 and linkage slot 55 respectively. When the tripping mechanism is tripped, the latch 5 is pushed by the trip latch 4 to rotate a certain angle, which drives the operating mechanism of the adjacent circuit breaker to trip through the linkage shaft 52 or linkage slot 55, thereby realizing the inter-pole linkage of the circuit breakers. Of course, the latch 5 may also only be provided with a linkage shaft 52 or linkage slot 55 for insertion into the operating mechanism of the adjacent circuit breaker.

[0050] like Figure 17 As shown, the second connecting rod 7 of this invention includes two connecting rod pieces 73 and two connecting ribs 74 connected between the two connecting rod pieces 73. The two connecting ribs 74 are spaced apart and located on the same side of the two connecting rod pieces 73. The two connecting rod pieces 73 have a snap-fit ​​gap 75 to avoid the jump buckle 4 and / or the lock buckle 5 and / or the lever 6. One end of the two connecting rod pieces 73 is provided with a second hinge hole 71 for hinged with the first connecting rod 3, and the other end of the two connecting rod pieces 73 is provided with a third hinge hole 72 for hinged with the lever 6. When the sliding groove section 402 of the jump buckle 4 is engaged in the snap-fit ​​gap 75 of the second connecting rod 7, the second hinge hole 71 of the second connecting rod 7 is directly opposite the sliding groove 42 of the jump buckle 4. One end of the first connecting rod 3 can simultaneously pass through the sliding groove 42 of the jump buckle 4 and the two second hinge holes 71 at one end of the second connecting rod 7. The second link 7 uses two link plates 73 to form a snap-fit ​​gap 75, which is used to avoid and connect the jump buckle 4 and the lever 6. It is reliable without connection and occupies little space.

[0051] like Figure 18As shown, the lever 6 of this invention includes a lever plate 60, a connecting rib 600 disposed on the lever plate 60, a supporting boss 68, a stop boss 66, and a third abutting boss 65. The connecting rib 600 is disposed along the edge of the lever plate 60 and is located between the stop boss 66 and the third abutting boss 65. The supporting boss 68 is provided with a fourth rotating shaft 67 for pivoting the moving contact 8. The supporting boss 68 is connected to the stop boss 66 and the connecting rib 600, and is lower than the stop boss 66 and the connecting rib 600 to form a clearance space for avoiding the moving contact 8. One end of the moving contact 8 is rotatably sleeved on the fourth rotating shaft 67 of the lever 6 through a fifth shaft hole 82 thereon, and rests on the supporting boss 68. 8. The third abutment protrusion 65 is located at one corner of the lever plate 60, and this corner of the lever plate 60 extends outward to form an extension 601. The extension 601 has a limiting inclined surface 64 on one side where it connects with the lever plate 60, which cooperates with the limiting cylinder 15 of the housing 1. The other side has a circular snap-fit ​​part 602, which cooperates with the snap-fit ​​gap 75 of the second connecting rod 7. The snap-fit ​​part 602 has a fourth hinge hole 63 for connecting with the second connecting rod 7. The bottom surface of the middle part of the extension 601 has a second abutment protrusion 62 for abutting one foot of the first torsion spring 102. The end of the extension 601 has a third shaft hole 61 for pivoting the lever 6, which cooperates with the third rotating shaft 14 of the housing 1. The limiting inclined surface 64 of the lever 6 contacts the limiting cylinder 15 of the housing 1, and the moving contact 8 and the stationary contact 9 are in a separated position to position and limit the end point of the lever 6 in the circuit breaker open or tripped state. One end of the first connecting rod 3 is hinged to the first hinge hole 24 of the handle 2, and the other end of the first connecting rod 3 is hinged to the second hinge hole 71 of the second connecting rod 7 and inserted into the slide groove 42 of the jump buckle 4; the locking part 602 of the lever 6 is locked into the locking gap 75 of the second connecting rod 7, and the third hinge hole 72 of the second connecting rod 7 is aligned with the fourth hinge hole 63 of the lever 6. The second connecting rod 7 and the lever 6 can be hinged by inserting a pin.

[0052] like Figure 1-10As shown, one end of the latch 5 is pivotally mounted on the housing 1, located to the side of the handle 2, and the other end is located to the side of the trip unit 101. One end of the lever 6 is pivotally mounted on the housing 1, located to the side of the handle 2, and the other end of the lever 6 is located to the side of the trip unit 101. Preferably, the latch 5 is stacked on the lever 6 and is arranged with the lever 6 on the same axis of rotation. The lever 6 is rotatably fitted onto the third axis 14 of the housing 1 through its third shaft hole 61. A lever elastic element for resetting the lever 6 is provided between the lever 6 and the housing 1. The latch 5 is rotatably fitted onto the third axis 14 of the housing 1 through its fourth shaft hole 51. A latch elastic element for resetting the latch 5 is provided between the latch 5 and the housing 1. Specifically, the lever elastic element is a first torsion spring 102. A first torsion spring 102 for resetting the lever 6 is installed at the pivot connection between the lever 6 and the housing 1. One leg of the first torsion spring 102 abuts against the first abutting boss 13 of the housing 1, and the other leg abuts against the second abutting boss 62 of the lever 6. The locking elastic element is a second torsion spring 103. A second torsion spring 103 for resetting the locking 5 is installed at the pivot connection between the locking 5 and the housing 1. One leg of the second torsion spring 103 abuts against the housing 1, and the other leg abuts against the locking 5. When the operating mechanism is in normal closing and opening operation, the tripping mechanism composed of the tripping buckle 4 and the locking buckle 5 is in a stationary state. When the circuit fault current triggers the trip unit 101 to act, the trip unit 101 drives the locking buckle 5 to rotate counterclockwise, the buckle edge 43 separates from the buckle platform 53, the locking buckle 5 rotates around the third rotating shaft 14, and the cam-five-bar linkage mechanism is transformed into a six-bar linkage mechanism. The six-bar linkage mechanism has two degrees of freedom, and the lever 6 returns to the open position under the drive of the first torsion spring 102.

[0053] like Figure 1-10 As shown, the movable contact 8 of this invention is pivotally mounted on the lever 6. An overtravel elastic element is provided between the movable contact 8 and the lever 6. The movable contact 8 is rotatably fitted onto the fourth rotating shaft 67 of the lever 6 through a fifth shaft hole 82. The overtravel elastic element is a third torsion spring 104, which is provided at the pivotal connection between the movable contact 8 and the lever 6. One leg of the third torsion spring 104 abuts against the third abutting boss 65 of the lever 6, and the other leg abuts against the abutting side 83 on one side of the movable contact 8. Figure 19 As shown, a stop protrusion 81 is provided on the other side of the moving contact 8, and a stop boss 66 corresponding to the stop protrusion 81 is provided on the lever 6. Further, as... Figure 19As shown, the moving contact 8 has a raised contact arc surface 84 on its side, which can contact and connect with the stationary contact 9. The stop protrusion 81 of the moving contact 8 contacts the stop boss 66. When the moving contact 8 and the stationary contact 9 are in the disconnected state, the third torsion spring 104 applies an initial pressure to the moving contact 8 and the lever 6, and the moving contact 8 and the lever 6 form an integral movement. When the moving contact 8 contacts the stationary contact 9, the moving contact 8 rotates a certain angle relative to the lever 6 around the fourth rotating shaft 67, the stop protrusion 81 separates from the stop boss 66, and the third torsion spring 104 applies a final pressure to the moving contact to ensure reliable contact between the moving contact 8 and the stationary contact 9. A pressure torsion spring exists between the moving contact 8 and the lever 6 to ensure reliable contact between the moving and stationary contacts. The lever 6, moving contact 8, and stationary contact 9 constitute a rocker-slider mechanism. The contact arc surface 84 slides and rubs along the surface of the stationary contact 9, which can effectively remove the oxide film on the surface of the moving and stationary contacts and improve the conductivity between the moving and stationary contacts.

[0054] like Figure 2-3 As shown, when the circuit breaker is in the open state, the handle 21 of the handle 2 swings to the left and contacts the housing 1. The end of the first link 3 connected to the handle 2 is located to the right of the rotation axis of the handle 2. The end of the first link 3 connected to the second link 7 slides to the end of the slide groove 42 away from the rotation axis of the jump buckle 4. The latch edge 43 of the jump buckle 4 engages with the latch platform 53 of the lock 5. The limiting slope 64 of the lever 6 ( Figure 18 The moving contact 8 and the stationary contact 9 are in contact with the limiting cylinder 15 of the housing 1, and are in the separated position. When the circuit breaker is in the closed state, such as Figure 5-6 As shown, the handle 2's handheld portion 21 swings to the right and contacts the housing 1. The end of the first link 3 connected to the handle 2 swings to the left of the handle 2's rotation axis. The end of the first link 3 connected to the second link 7 slides to the left of the slide groove 42 away from the rotation axis of the trip latch 4, causing the second link 7 to pull the lever 6. The lever 6 drives the moving contact 8 to swing to the left and contact the stationary contact 9. The first link 3 and the handle 2 form a certain closing angle, and the moving contact 8 and the stationary contact 9 are in a closed state. When a circuit breaker fault occurs, such as a short circuit, the pin of the trip unit 101 strikes the trip drive part 56 of the latch 5, causing the latch 5 to rotate counterclockwise, releasing the latch 4 and the latch 5's latching engagement. The lever 6 drives the moving contact to swing to the right and separate from the stationary contact. The trip latch 4 rotates clockwise, and the hinge axis of the first link 3 and the second link 7 slides to the right along the slide groove 42.

[0055] 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 inventive concept, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a housing (1), a handle (2), a first link (3), a trip latch (4), a lock (5), a second link (7), a lever (6), a moving contact (8), and a stationary contact (9), characterized in that: The jump buckle (4) and the lock buckle (5) are pivotally mounted on the housing (1). The jump buckle (4) is provided with a sliding groove (42) and a jump buckle latching part for latching with the latching platform (53) of the lock buckle (5). The handle (2) is pivotally mounted on the housing (1). One end of the first connecting rod (3) is connected to the handle (2), and the other end of the first connecting rod (3) is hinged to one end of the second connecting rod (7). The other end of the second connecting rod (7) is connected to the lever (6). The hinged ends of the first connecting rod (3) and the second connecting rod (7) are slidably engaged with the sliding groove (42) of the jump buckle (4). The lever (6) is pivotally mounted on the housing (1). One end of the moving contact (8) is mounted on the lever (6), and the other end of the moving contact (8) is correspondingly set with the stationary contact (9). One end of the jump buckle (4) is rotatably mounted on the lower side of the handle (2), located between the handle (2) and the release device (101). The lock (5) and lever (6) are rotatably mounted on the other side of the handle (2). The lock (5) and lever (6) are arranged on the same axis of rotation and are stacked. The other end of the jump buckle (4) is provided with a jump buckle latching part that engages with the lock (5). The slide groove (42) is arranged between the rotation axis of the jump buckle (4) and the jump buckle latching part. The other end of the jump buckle (4) extends horizontally from the lower side of the handle (2) to the other side of the handle (2) to engage with the lock (5). The second connecting rod (7) is basically horizontally arranged below the handle (2), located between the handle (2) and the release device (101). When the circuit breaker is in the closed state, the sliding groove (42) of the trip buckle (4) is subjected to the pressure F1 of the hinge end of the first link (3) and the second link (7), and the lever arm is L1. The trip buckle latch of the trip buckle (4) is subjected to the positive pressure F2 of the latch platform (53) of the lock buckle (5), and the lever arm is L2. The length ratio of the lever arm L1 to L2 is less than 1 / 4.

2. The circuit breaker according to claim 1, characterized in that: The handle (2) is rotatably mounted via the first pivot (12), the buckle (5) is rotatably mounted via the third pivot (14), one end of the snap buckle (4) is rotatably mounted via the second pivot (11), and the buckle edge (43) at the other end engages with the buckle (5). The first pivot (12), the third pivot (14), and the second pivot (11) are located at the three vertices of an obtuse triangle, wherein the first pivot (12) is located at the obtuse vertex of the obtuse triangle.

3. The circuit breaker according to claim 1, characterized in that: The latch (5) is rotatably mounted at one end and has a release drive part (56) for triggering release at the other end. The latch (5) has a sliding surface that slides with the release latch part of the release latch (4). The sliding surface has a protruding latch platform (53) that latches with the release latch part.

4. The circuit breaker according to claim 1, characterized in that: The lever (6) is rotatably fitted onto the third pivot (14) of the housing (1) through the third pivot hole (61) thereon. A lever elastic element for resetting the lever (6) is provided between the lever (6) and the housing (1). The latch (5) is rotatably fitted onto the third pivot (14) of the housing (1) through the fourth pivot hole (51) thereon. A latch elastic element for resetting the latch (5) is provided between the latch (5) and the housing (1).

5. The circuit breaker according to claim 3, characterized in that: The jump buckle (4) includes a jump buckle rotating part (401), a sliding groove section (402) and a jump buckle hook arm (403) connected in sequence. The jump buckle rotating part (401) is provided with a second shaft hole (41). The sliding groove section (402) is provided with a sliding groove (42). The end corner of the jump buckle hook arm (403) is provided with a protruding hook. The end face of the jump buckle hook arm (403) is provided with a protruding sliding arc surface (44) that slides with the lock (5). The part where the sliding arc surface (44) connects with the hook is a hook edge (43) that can be fastened to the hook platform (53) of the lock (5).

6. The circuit breaker according to claim 5, characterized in that: The rotation axis of the jump buckle (4) passes through the center O of the sliding arc surface (44) and the line connecting the sliding arc surface (44) is L3. The line connecting the rotation axis of the jump buckle (4) to the edge of the buckle (43) is L4. The line L3 and L4 have an angle α, where α is an acute angle, and the length of the line L3 is greater than the length of the line L4.

7. The circuit breaker according to claim 3, characterized in that: One end of the latch (5) is provided with a fourth shaft hole (51), and the bottom surface of the other end of the latch (5) is provided with a downward protruding release drive part (56); the bottom surface of the middle part of the latch (5) near the fourth shaft hole (51) is provided with a downward protruding latch protrusion (50), and a clearance groove for avoiding the second connecting rod (7) is formed between the latch protrusion (50) and the release drive part (56). The latch protrusion (50) is provided with a guide protrusion (54) protruding to the side as a sliding surface that cooperates with the jump buckle (4). The side of the latch protrusion (50) is provided with a hook platform (53) that cooperates with the jump buckle (4). The guide protrusion (54) is spaced apart from the bottom surface of the latch (5).

8. The circuit breaker according to any one of claims 1-7, characterized in that: The bottom surface of the latch (5) is provided with a downward protruding linkage shaft (52), and the top surface of the latch (5) is provided with a linkage groove (55) at a position corresponding to the linkage shaft (52).

9. The circuit breaker according to any one of claims 1-7, characterized in that: The second link (7) includes two link pieces (73) and a connecting rib (74) connecting the two link pieces (73). The two link pieces (73) have a snap-fit ​​gap (75) to avoid the jump buckle (4) and / or lock buckle (5). One end of the two link pieces (73) is provided with a second hinge hole (71) for hinged with the first link (3), and the other end of the two link pieces (73) is provided with a third hinge hole (72) for hinged with the lever (6).

10. The circuit breaker according to any one of claims 1-7, characterized in that: The movable contact (8) is pivotally mounted on the lever (6), and the movable contact (8) is rotatably connected to the lever (6); and a third torsion spring (104) is provided at the connection between the movable contact (8) and the lever (6), with one leg of the third torsion spring (104) abutting against the lever (6) and the other leg abutting against the movable contact (8).

11. The circuit breaker according to claim 10, characterized in that: The moving contact (8) is provided with a stop protrusion (81), and the lever (6) is provided with a stop protrusion (66) corresponding to the stop protrusion (81).

12. The circuit breaker according to any one of claims 1-7, characterized in that: The lever (6) includes a lever plate (60) and a support boss (68) provided on the lever plate (60). The support boss (68) is provided with a fourth pivot (67) for pivotal mounting of the moving contact (8). One corner of the lever plate (60) extends outward to form an extension (601). The extension (601) is provided with a limiting inclined surface (64) on one side of the connection with the lever plate (60) for cooperating with the limiting cylinder (15) of the housing (1). The other side is provided with a fourth hinge hole (63) for hinged with the second connecting rod (7). The end of the extension (601) is provided with a third shaft hole (61) for pivotal mounting of the lever (6).

13. The circuit breaker according to any one of claims 1-7, characterized in that: The first connecting rod (3) is a U-shaped rod. One end of the U-shaped rod is hinged to the first hinge hole (24) of the handle (2), and the other end of the U-shaped rod is hinged to the second hinge hole (71) of the second connecting rod (7) and inserted into the groove (42) of the jump buckle (4).

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