Moving contact operating mechanism and circuit breaker

Abstract

The present disclosure provides a moving contact operating mechanism and a circuit breaker, belonging to the field of electrical technology. The moving contact operating mechanism includes a handle, a moving contact, a push rod, a lock and a reset spring. The handle and the moving contact are both rotatably connected to the housing of the circuit breaker. One end of the push rod is rotatably connected to the handle, and the other end is against the moving contact. The push rod is used to push the moving contact to contact the static contact of the circuit breaker during the closing process. The lock is rotatably connected to the housing, and the push rod is located on the rotation path of the lock. The lock is used to drive the push rod to separate from the moving contact when the circuit is short-circuited or overloaded. The reset spring is respectively against the housing and the moving contact. The reset spring is used to, after closing, drive the handle to remain in the closed state through the moving contact and the push rod, and drive the moving contact to separate from the static contact after the push rod is separated from the moving contact. The moving contact operating mechanism provided by the present disclosure includes a small number of parts, low complexity of the mechanism, and high reliability.

Description

Technical Field

[0001] The present disclosure relates to the field of electrical technology, and in particular to a moving contact operating mechanism and a circuit breaker. Background Art

[0002] A circuit breaker is a type of electrical switch used to protect electrical circuits. It connects to a circuit and keeps it connected when the circuit is operating normally, but disconnects it in the event of a short circuit or overload.

[0003] The circuit breaker connects and disconnects the circuit by making and separating the internal static contact and moving contact. In order to control the moving contact, the circuit breaker is equipped with a moving contact operating mechanism to control the contact and separation of the moving contact and static contact.

[0004] For circuit breakers, the reliability of the moving contact operating mechanism directly affects the safety of users. Summary of the Invention

[0005] The present disclosure provides a moving contact operating mechanism and a circuit breaker, which can solve the technical problems existing in the related art. The technical solutions of the moving contact operating mechanism and the circuit breaker are as follows:

[0006] In a first aspect, a moving contact operating mechanism is provided, the moving contact operating mechanism comprising a handle, a moving contact, a push rod, a lock catch, and a return spring;

[0007] The handle and the moving contact are both rotatably connected to the housing of the circuit breaker, one end of the push rod is rotatably connected to the handle, and the other end abuts against the moving contact, and the push rod is used to push the moving contact into contact with the static contact of the circuit breaker during the closing process;

[0008] The lock catch is rotatably connected to the housing, and the push rod is located on the rotation path of the lock catch. The lock catch is used to drive the push rod to separate from the moving contact when the circuit is short-circuited or overloaded;

[0009] The reset spring is respectively against the housing and the moving contact. The reset spring is used to drive the handle to remain in the closed state through the moving contact and the push rod after closing, and to drive the moving contact to separate from the static contact after the push rod is separated from the moving contact.

[0010] In a possible implementation, the movable contact has a waist-shaped hole, and the waist-shaped hole is encircled by the movable contact mounting shaft of the housing;

[0011] The push rod is used to push the moving contact to rotate around the moving contact mounting shaft in a first closing stage, and to push the moving contact to swing relative to the moving contact mounting shaft in a second closing stage, wherein the first closing stage is before the second closing stage;

[0012] The reset spring is further used to drive the moving contact to be in close contact with the static contact after closing.

[0013] In a possible implementation, when the push rod pushes the moving contact to move, the surface of the moving contact in contact with the push rod is an arc surface, and the surface of the push rod in contact with the moving contact is a plane.

[0014] In a possible implementation, the moving contact has a driving shaft, and a side surface of the driving shaft is used to contact the push rod.

[0015] In a possible implementation, the push rod includes a connecting member and a rod member;

[0016] The connecting member is rotatably connected to the handle;

[0017] The rod is connected to the connecting member, and the cross section of the rod is rectangular. The rod is used to push the moving contact.

[0018] In one possible implementation, the connecting member includes a rotating shaft portion, a first clamping arm, and a second clamping arm. The rotating shaft portion is rotatably connected to the handle and has a slot opening along the axial direction. The first clamping arm and the second clamping arm are arranged side by side.

[0019] The rod is U-shaped and includes an insertion section, a connecting section and a driving section connected in sequence. The insertion section is inserted into the slot, the connecting section is clamped between the first clamping arm and the second clamping arm, and the driving section is used to contact the moving contact.

[0020] In a possible implementation, the lock includes a rotation connection portion, a first driving portion, and a second driving portion;

[0021] The rotating connection portion is rotatably connected to the housing;

[0022] The first driving part is opposite to the electromagnetic system of the circuit breaker and is in transmission connection with the thermal system of the circuit breaker;

[0023] The push rod is located on a rotation path of the second driving portion, and the second driving portion is used to drive the push rod to separate from the moving contact.

[0024] In a possible implementation, a portion of the first driving portion facing the moving contact has a driving protrusion;

[0025] The movable contact is located on a rotation path of the driving protrusion, and the driving protrusion is used to drive the movable contact to separate from the static contact when the circuit is short-circuited or overloaded.

[0026] In a possible implementation, the moving contact operating mechanism further includes a reset torsion spring;

[0027] The reset torsion spring is located on the moving contact, and the first torsion arm of the reset torsion spring abuts against the push rod, and the second torsion arm abuts against the lock;

[0028] The reset torsion spring is used to drive the push rod and the moving contact to remain in an abutting state, and to drive the lock and the push rod to remain in a separated state.

[0029] In a possible implementation, the moving contact has a reset torsion spring installation shaft, and the reset torsion spring ring is sleeved on the reset torsion spring installation shaft.

[0030] In a second aspect, a circuit breaker is provided, comprising a housing, a first wiring member, a static contact, an electromagnetic system, a second wiring member, a thermal system, and a movable contact operating mechanism according to any one of the first aspects;

[0031] The first wiring member is electrically connected to the static contact through the electromagnetic system, and the second wiring member is electrically connected to the movable contact of the movable contact operating mechanism through the thermal system;

[0032] The lock of the moving contact operating mechanism is opposite to the electromagnetic system and is transmission-connected to the thermal system.

[0033] The technical solution provided by the present disclosure includes at least the following beneficial effects:

[0034] To manually close the circuit breaker, the user moves the handle from the open position toward the closed position. During this process, the push rod drives the moving contact into contact with the static contact. When the handle reaches the closed position, the return spring, through the moving contact and the push rod, keeps the handle in the closed position. The moving and static contacts remain in contact, and the circuit breaker connects the circuit.

[0035] When the user manually opens the circuit breaker, the handle is moved from the closing position to the opening position. During this process, the handle drives the push rod away from the moving contact, and the moving contact loses the obstruction of the push rod. Driven by the reset spring, the moving contact separates from the static contact, and the circuit breaker disconnects the circuit.

[0036] When the circuit is short-circuited or overloaded, the lock drives the push rod to separate from the moving contact, and the moving contact loses the obstruction of the push rod. Under the action of the reset spring, the moving contact separates from the static contact, and the circuit breaker disconnects the circuit.

[0037] As can be seen, the movable contact operating mechanism provided by the present disclosure can control the contact and separation of the movable contact and the stationary contact under manual operation by the user, and can also automatically control the separation of the movable contact and the stationary contact in the event of a circuit short circuit or overload. Furthermore, compared with movable contact operating mechanisms in related arts, the movable contact operating mechanism provided by the present disclosure includes fewer parts and is less complex, thus having higher reliability.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0040] Figure 1 is a schematic diagram of a circuit breaker in an open state shown in an embodiment of the present disclosure;

[0041] Figure 2 is a schematic diagram of a circuit breaker in a closed state shown in an embodiment of the present disclosure;

[0042] Figure 3 is a partial schematic diagram of a circuit breaker in an open state shown in an embodiment of the present disclosure;

[0043] Figure 4 is a partial schematic diagram of a circuit breaker when the circuit breaker is closed, shown in an embodiment of the present disclosure;

[0044] Figure 5 is a partial schematic diagram of a circuit breaker when the circuit breaker is closed, shown in an embodiment of the present disclosure;

[0045] Figure 6 is a partial schematic diagram of a circuit breaker in a closed state shown in an embodiment of the present disclosure;

[0046] Figure 7 This is a partial schematic diagram of a circuit breaker in a short circuit situation shown in an embodiment of the present disclosure;

[0047] Figure 8 This is a partial schematic diagram of a circuit breaker in a short circuit situation shown in an embodiment of the present disclosure;

[0048] Figure 9 is a schematic diagram of a connector shown in an embodiment of the present disclosure;

[0049] Figure 10 is a schematic diagram of a rod shown in an embodiment of the present disclosure;

[0050] Figure 11is a schematic diagram of a lock shown in an embodiment of the present disclosure;

[0051] Figure 12 is a schematic diagram of a handle shown in an embodiment of the present disclosure;

[0052] Figure 13 is a schematic diagram of a housing shown in an embodiment of the present disclosure;

[0053] Figure 14 is a schematic diagram of a handle body shown in an embodiment of the present disclosure;

[0054] Figure 15 is a schematic diagram of a handle body shown in an embodiment of the present disclosure;

[0055] Figure 16 It is a schematic diagram of a moving contact shown in an embodiment of the present disclosure.

[0056] Legend

[0057] 01, housing, 011, moving contact mounting shaft, 012, handle mounting shaft, 013, handle limit block, 014, first opening limit wall, 015, first closing limit wall, 016, lock mounting shaft, 017, moving contact limit column, 018, reset spring limit structure;

[0058] 02. First connection component;

[0059] 03. Static contact;

[0060] 04, electromagnetic system, 041, ejector rod;

[0061] 05. Second connecting member;

[0062] 06, thermal system, 061, double gold tie rod;

[0063] 07. Moving contact operating mechanism;

[0064] 1. Handle, 11. Handle body, 110. Handle center hole, 111. First opening limit structure, 112. First closing limit structure, 113. Second opening limit structure, 114. Second closing limit structure, 115. Handle spring slot, 116. First handle spring hanging on the wall, 117. Second handle spring hanging on the wall, 118. Push rod mounting hole, 12. Handle spring;

[0065] 2. Moving contact, 20. Waist-shaped hole, 21. Driving shaft, 22. Reset torsion spring mounting shaft, 23. Reset spring mounting arm, 24. Welding structure, 25. Moving contact point;

[0066] 3. Push rod, 31. Connecting member, 311. Rotating shaft, 3110. Slot, 312. First clamping arm, 313. Second clamping arm, 3131. First reset torsion spring hanging on the wall, 32. Rod, 321. Inserting section, 322. Connecting section, 323. Driving section;

[0067] 4. Lock, 41. Rotating connection part, 410. Lock mounting hole, 42. First driving part, 421. Driving protrusion, 422. Double gold pull rod hole, 43. Second driving part, 431. Second reset torsion spring hanging on the wall;

[0068] 5. Return spring;

[0069] 6. Reset torsion spring.

[0070] The above drawings illustrate specific embodiments of the present disclosure, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the present disclosure in any way, but rather to illustrate the concepts of the present disclosure to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0071] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0072] The terms used in the embodiments of the present disclosure are intended only to explain the embodiments of the present disclosure and are not intended to limit the present disclosure. Unless otherwise defined, technical or scientific terms used herein should have the same ordinary meaning as those of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," "third," and similar terms used in the patent specification and claims of the present disclosure do not denote any order, quantity, or importance, but are merely used to distinguish between different components. Similarly, terms such as "a" or "an" do not denote a limitation on quantity, but rather denote the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects preceding the term "include" or "comprising" include the elements or objects listed after the term and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0073] The embodiment of the present disclosure provides a moving contact operating mechanism, such as Figure 1 and Figure 2As shown, the moving contact operating mechanism includes a handle 1, a moving contact 2, a push rod 3, a lock 4, and a return spring 5. Both the handle 1 and the moving contact 2 are rotatably connected to the circuit breaker's housing 01. One end of the push rod 3 is rotatably connected to the handle 1, while the other end abuts against the moving contact 2. The push rod 3 is used to push the moving contact 2 into contact with the circuit breaker's stationary contact 03 during the closing process. The lock 4 is rotatably connected to the housing 01, and the push rod 3 is located in the lock's rotational path. The lock 4 is used to drive the push rod 3 away from the moving contact 2 in the event of a short circuit or overload. The return spring 5 abuts against the housing 01 and the moving contact 2, respectively. After closing, the return spring 5 is used to maintain the handle 1 in the closed state through the moving contact 2 and the push rod 3. After the push rod 3 separates from the moving contact 2, the return spring 5 drives the moving contact 2 away from the stationary contact 03.

[0074] The working process of the movable contact operating mechanism provided by the embodiment of the present disclosure is exemplarily described below:

[0075] When the user manually closes the circuit breaker, move the handle 1 from the open position to the closed position. Figure 3-Figure 6 As shown in FIG, during this process, the push rod 3 drives the moving contact 2 to contact the static contact 03. Figure 6 As shown, after the handle reaches the closing position, the reset spring 5 drives the handle 1 through the moving contact 2 and the push rod 3 to remain in the closing position, and the moving contact 2 and the static contact 03 remain in contact, and the circuit breaker is connected to the circuit.

[0076] Specifically, during the closing process, when the handle 1 has not reached the closing position, the moving contact 2 and the static contact 03 have already contacted (such as Figure 5 At this point, the force F1 exerted on handle 1 by push rod 3 causes it to move toward the open position. If the user lets go, handle 1 will rebound to the open position. Therefore, the user needs to continue to push handle 1 toward the closed position to complete the closing action.

[0077] Since the moving contact 2 and the static contact 03 have been in contact, in order to continue to turn the handle 1, Figure 5 As shown, the moving contact 2 has a waist-shaped hole 20, and the waist-shaped hole 20 is sleeved on the moving contact mounting shaft 011 of the housing 01.

[0078] like Figure 4-Figure 5 As shown, in the first closing stage, the push rod 3 pushes the moving contact 2 to rotate around the moving contact mounting shaft 011. The first closing stage is the stage from when the moving contact 2 starts to rotate toward the static contact 03 to when the moving contact 2 contacts the static contact 03.

[0079] like Figure 5-Figure 6As shown, in the second closing stage, because the moving contact 2 and the static contact 03 are already in contact, the push rod 3 cannot continue to push the moving contact 2 to rotate. Due to the presence of the waist-shaped hole 20, the push rod 3 pushes the moving contact 2 to swing relative to the moving contact mounting shaft 011, with the static contact 03 as the fulcrum. The second closing stage is the stage from the initial contact between the moving contact 2 and the static contact 03 to the completion of the closing.

[0080] After the closing is completed, Figure 6 As shown, one side of the moving contact 2 is against the reset spring 5, and one end of the other side of the moving contact 2 is blocked by the push rod 3, and the other end is blocked by the static contact 03 (as shown in FIG. Figure 6 As shown in the two dotted-line boxes, due to the presence of the waist-shaped hole 20, there is no force point between the moving contact 2 and the moving contact mounting shaft 011. Therefore, the reset spring 5 drives one end of the moving contact 2 to press the push rod 3 and the other end to press the static contact 03.

[0081] The moving contact 2 presses the static contact 03, making the moving contact 2 in close contact with the static contact 03. The moving contact 2 presses the push rod 3, so that the push rod 3 exerts a force F1 on the handle 1, so that the handle 1 remains in the closed position, and the entire closing action is completed.

[0082] In other examples, in order to continue to move the handle 1 when the moving contact 2 and the static contact 03 are already in contact, the elasticity of the moving contact 2 can be set to be greater, or the elasticity of the static contact 03 can be set to be greater, so that the stroke of the push rod 3 can be adapted through the deformation of the moving contact 2 or the deformation of the static contact 03.

[0083] When the user manually opens the circuit breaker, the handle 1 is moved from the closing position to the opening position. During this process, the handle 1 drives the push rod 3 away from the moving contact 2. Then the moving contact 2 loses the obstruction of the push rod 3. Driven by the reset spring 5, the moving contact 2 separates from the static contact 03, and the circuit breaker disconnects the circuit.

[0084] When the circuit is short-circuited, Figure 7 and Figure 8 As shown, the top rod 041 of the electromagnetic system 04 pushes the lock 4 to rotate, and the lock 4 drives the push rod 3 to separate from the moving contact 2. Then the moving contact 2 loses the obstruction of the push rod 3. Under the action of the reset spring 5, the moving contact 2 separates from the static contact 03, and the circuit breaker disconnects the circuit.

[0085] When the circuit is overloaded, the pull rod 061 of the thermal system 06 pulls the lock 4 to rotate, and the lock 4 drives the push rod 3 to separate from the moving contact 2. The moving contact 2 loses the obstruction of the push rod 3. Under the action of the reset spring 5, the moving contact 2 separates from the static contact 03, and the circuit breaker disconnects the circuit.

[0086] It can be seen that the moving contact operating mechanism provided in the embodiment of the present disclosure can control the contact and separation of the moving contact 2 and the static contact 03 under manual operation of the user, and automatically control the separation of the moving contact 2 and the static contact 03 when the circuit is short-circuited or overloaded.

[0087] Furthermore, compared with the movable contact operating mechanism in the related art, the movable contact operating mechanism provided by the embodiment of the present disclosure includes fewer parts and has a lower complexity of the mechanism, and therefore has higher reliability.

[0088] In some examples, the moving contact 2 , the push rod 3 , and the return spring 5 are all metal parts, and the lock catch 4 is a plastic part.

[0089] Thus, the movable contact operating mechanism provided by the disclosed embodiment includes a relatively small number of plastic parts (only the lock catch 4 is a plastic part), thereby reducing the possibility of deformation of the plastic parts at high temperatures affecting the reliability of the movable contact operating mechanism. In the movable contact operating mechanism provided by the disclosed embodiment, the metal push rod 3 directly pushes the metal movable contact 2, and the force transmission is completed by the metal parts, which greatly improves the temperature resistance of the movable contact operating mechanism and increases the reliability of the movable contact operating mechanism.

[0090] In some examples, in order to facilitate the push rod 3 to push the moving contact 2 to move, such as Figure 6 As shown in the portion framed by the dotted line on the upper side of the drawing, when the push rod 3 pushes the moving contact 2 to move, the surface of the moving contact 2 that contacts the push rod 3 is an arc surface, and the surface of the push rod 3 that contacts the moving contact 2 is a plane.

[0091] Therefore, the push rod 3 and the moving contact 2 will not get stuck, making it easier for the lock 4 to disengage the push rod 3 and the moving contact 2, thereby improving the reliability of the circuit breaker in disconnecting the circuit when short circuiting and overloading occur.

[0092] In order to realize that the contact surface between the moving contact 2 and the push rod 3 is an arc surface, in some examples, such as Figure 6 As shown, the moving contact 2 has a driving shaft 21 , and the side surface of the driving shaft 21 is used to contact the push rod 3 .

[0093] In order to achieve a planar contact surface between the push rod 3 and the moving contact 2 , in some examples, the push rod 3 includes a rod 32 , which is used to contact the driving shaft 21 , and the cross section of the rod 32 is rectangular.

[0094] Furthermore, in order to facilitate the rotational connection between the rod 32 and the handle 1, in some examples, the push rod 3 further includes a connecting member 31, which is connected to the rod 32 and is rotationally connected to the handle 1. The connecting member 31 can have a circular shaft structure for rotational connection with the handle 1.

[0095] In other examples, the push rod 3 may not include the connecting member 31, but the cross-section of the first end of the rod member 32 is rectangular, and the cross-section of the second end is circular. The first end of the rod member 32 is used to contact the moving contact 2, and the second end is used to be rotatably connected to the handle 1.

[0096] It should be noted that the push rod 3 may not always be in contact with the driving shaft 21. Figure 3 As shown, in the open state, the push rod 3 is not in contact with the drive shaft 21. Figure 3-Figure 4 As shown, before the push rod 3 pushes the moving contact 2 to rotate, the handle 1 first drives the push rod 3 to contact the driving shaft 21.

[0097] Below, a possible implementation of the connecting member 31 and the rod 32 is provided:

[0098] In some examples, such as Figure 9 As shown, the connecting member 31 includes a shaft portion 311, a first clamping arm 312 and a second clamping arm 313. The shaft portion 311 is rotatably connected to the handle 1, and the shaft portion 311 has a slot 3110 opening along the axial direction. The first clamping arm 312 and the second clamping arm 313 are arranged side by side.

[0099] like Figure 10 As shown, the rod 32 is U-shaped and includes an insertion section 321, a connecting section 322 and a driving section 323 connected in sequence. The insertion section 321 is inserted into the slot 3110, the connecting section 322 is clamped between the first clamping arm 312 and the second clamping arm 313, and the driving section 323 is used to contact the moving contact 2.

[0100] The disclosed embodiments do not limit the principle by which the lock catch 4 drives the push rod 3 to separate from the movable contact 2 when the circuit is short-circuited or overloaded. In some examples, the lock catch 4 is opposed to the electromagnetic system 04 of the circuit breaker, specifically, to the top rod 041 of the electromagnetic system 04. When the circuit is short-circuited, the top rod 041 of the electromagnetic system 04 extends and pushes the lock catch 4 toward the push rod 3, thereby pushing the lock catch 4 to separate the push rod 3 from the movable contact 2.

[0101] In some examples, the lock catch 4 is in driving connection with the thermal system 06 of the circuit breaker. Specifically, the lock catch 4 is connected to the double-metal pull rod 061 of the thermal system 06. When the circuit is overloaded, the double-metal pull rod 061 drives the lock catch 4 to rotate toward the push rod 3, and the lock catch 4 pushes the push rod 3 to separate from the moving contact 2.

[0102] The following is a more detailed exemplary description of the lock buckle 4:

[0103] In some examples, such as Figure 7 and Figure 8As shown, the lock 4 includes a rotating connection portion 41, a first drive portion 42, and a second drive portion 43. The rotating connection portion 41 is rotationally connected to the housing 01. The first drive portion 42 is opposite the circuit breaker's electromagnetic system 04 and is transmission-connected to the circuit breaker's thermal system 06. The push rod 3 is located in the rotation path of the second drive portion 43, which is used to drive the push rod 3 away from the moving contact 2.

[0104] In some examples, such as Figure 11 As shown, the rotating connecting portion 41 has a lock mounting hole 410, as shown in FIG. Figure 13 As shown, the housing 01 has a lock mounting shaft 016. The lock mounting shaft 016 extends into the lock mounting hole 410 to achieve a rotational connection between the rotation connection portion 41 and the housing 01.

[0105] When the circuit is short-circuited, Figure 7 and Figure 8 As shown, the push rod 041 of the electromagnetic system 04 pushes the first driving part 42 to rotate the entire lock 4, and then the second driving part 43 pushes the push rod 3 to separate from the moving contact 2.

[0106] When the circuit is overloaded, the double metal pull rod 061 pulls the first driving part 42, causing the entire lock 4 to rotate, and the second driving part 43 pushes the push rod 3 to separate from the moving contact 2.

[0107] In some examples, such as Figure 11 As shown, the first driving part 42 has a double-metal tie rod hole 422 , and the double-metal tie rod hole 422 is used for allowing the double-metal tie rod 061 to pass through, so as to achieve the connection between the double-metal tie rod 061 and the first driving part 42 .

[0108] In order to improve the breaking capacity of the circuit breaker, in some examples, such as Figure 8 As shown, after the lock catch 4 pushes the push rod 3 to separate from the moving contact 2, the lock catch 4 immediately touches the moving contact 2 and immediately pushes the moving contact 2 to separate from the static contact 03.

[0109] In some examples, such as Figure 8 and Figure 11 As shown, the portion of the first driving portion 42 facing the moving contact 2 has a driving protrusion 421. The moving contact 2 is located on the rotation path of the driving protrusion 421, and the driving protrusion 421 is used to drive the moving contact 2 to separate from the static contact 03 when the circuit is short-circuited or overloaded.

[0110] In the movable contact operating mechanism provided by the embodiment of the present disclosure, the force when the movable contact 2 is separated from the static contact 03 is provided by the return spring 5 and the lock 4.

[0111] Specifically, after the lock 4 drives the push rod 3 to separate from the moving contact 2, the moving contact 2 loses the obstruction of the push rod 3, and the reset spring 5 begins to drive the moving contact 2 to separate from the static contact 03, and at the moment the moving contact 2 separates from the push rod 3, the speed of the driving section of the reset spring 5 is 0.

[0112] After the movable contact 2 is freed from the obstruction of the push rod 3, the driving protrusion 421 contacts the movable contact 2. Furthermore, since the latch 4 has already rotated a certain distance, the speed of the driving protrusion 421 is not zero at the moment the movable contact 2 separates from the push rod 3. Therefore, compared to the case where only the return spring 5 drives the movable contact 2 and the stationary contact 03 to separate, at least at the beginning of disconnection, the latch 4 can drive the movable contact 2 to separate from the stationary contact 03 at a faster speed, thereby improving the breaking capacity of the circuit breaker.

[0113] In order to enable the push rod 3 to remain in contact with the moving contact 2, and to prevent the lock catch 4 from driving the push rod 3 to separate from the moving contact 2 in the non-short circuit state and the non-overload state, it is necessary to provide corresponding reset parts for the push rod 3 and the lock catch 4. The reset parts are used to drive the push rod 3 and the moving contact 2 to remain in a state of contact, and drive the lock catch 4 and the push rod 3 to remain in a separated state.

[0114] The embodiments of the present disclosure do not limit the implementation of the reset element. In some examples, such as Figure 2-Figure 8 As shown in any one of the figures, the movable contact operating mechanism further includes a reset torsion spring 6, which is located on the movable contact 2, and a first torsion arm of the reset torsion spring 6 abuts against the push rod 3, and a second torsion arm abuts against the second driving portion 43. The reset torsion spring 6 is used to drive the push rod 3 and the movable contact 2 to remain in an abutting state, and to drive the lock catch 4 and the push rod 3 to remain in a separated state.

[0115] Furthermore, when the circuit breaker switches from the closed state to the open state, the reset torsion spring 6 can reset the push rod 3 and the lock 4 for the next closing.

[0116] like Figure 9 As shown, the second clamping arm 313 of the connecting member 31 has a first return torsion spring hanging wall 3131 , and the first return torsion spring hanging wall 3131 is used to abut against the first torsion arm of the torsion spring 6 .

[0117] like Figure 11 As shown, the second driving portion 43 of the lock 4 has a second reset torsion spring hanging wall 431 , and the second reset torsion spring hanging wall 431 is used to abut against the second torsion arm of the torsion spring 6 .

[0118] In order to facilitate the installation of the reset torsion spring 6, in some examples, such as Figure 3 and Figure 4 As shown, the moving contact 2 has a reset torsion spring mounting shaft 22 , and the reset torsion spring 6 is sleeved on the reset torsion spring mounting shaft 22 .

[0119] In the movable contact operating mechanism provided by the disclosed embodiment, before the lock catch 4 pushes the push rod 3, the tripping force (i.e., the force required by the push rod 041 to push the lock catch 4, or the force required by the double-metal pull rod 061 to pull the lock catch 4) is unrelated to the contact force between the movable contact 2 and the stationary contact 03, and is only related to the force of the reset torsion spring 6, which has a relatively small force. Therefore, at this stage, the push rod 041 and the double-metal pull rod 061 can easily push the lock catch 4 to rotate. Only after the lock catch 4 contacts the push rod 3 does the tripping force become related to the pressure between the movable contact 2 and the stationary contact 03.

[0120] In the movable contact operating mechanism in the related art, during the entire tripping process, the tripping force is related to the contact force between the movable contact 2 and the static contact 03.

[0121] Since the contact force between the moving contact 2 and the static contact 03 is not fixed but is related to the manufacturing accuracy of each component in the circuit breaker, for some circuit breakers, the abnormal contact force between the moving contact 2 and the static contact 03 may cause the required tripping force of the circuit breaker to be very large, resulting in the failure of the push rod 041 and the double metal pull rod 061 to push the lock 4 to rotate.

[0122] The movable contact operating mechanism provided by the embodiment of the present disclosure does not cause the above situation at least when the lock 4 starts to move. Therefore, the possibility of the circuit breaker failing to normally disconnect the circuit is reduced, and the reliability of the circuit breaker is improved.

[0123] The handle 1 is described in more detail below:

[0124] In some examples, such as Figure 12 As shown, the handle 1 includes a handle body 11 and a handle spring 12. The handle body 11 is rotatably connected to the shell 01. The handle spring 12 is installed on the handle body 11, and one torsion arm of the handle spring 12 is against the shell 01, and the other torsion arm is against the handle body 11.

[0125] The handle spring 12 is used to drive the handle body 11 to remain in the open position, so that the handle 1 automatically returns to the open position when no external force is applied. During the closing process, when the user moves the handle 1, the elasticity of the handle spring 12 needs to be overcome.

[0126] The following is an exemplary description of the installation method of the handle body 1 and the housing 01:

[0127] like Figure 13 As shown, the housing 01 has a handle mounting shaft 012. Figure 14 As shown, the handle body 11 has a handle center hole 110. The handle mounting shaft 012 passes through the handle center hole 110, thereby realizing the rotation connection between the handle body 11 and the housing 01.

[0128] In order to limit the rotation range of the handle body 11, in some examples, such as Figure 13 As shown, the housing 01 has a first opening limit wall 014 and a first closing limit wall 015. Figure 14 As shown, the handle body 11 has a first opening limit structure 111 and a first closing limit structure 112. When the first opening limit wall 014 contacts the first opening limit structure 111, the handle 1 is in the opening position, and when the first closing limit wall 015 contacts the first closing limit structure 112, the handle 1 is in the closing position.

[0129] In other examples, such as Figure 13 As shown, the housing 01 has a handle limit block 013, and the handle limit block 013 is fixed to the side wall of the handle mounting shaft 012. Figure 15 As shown, the handle body 11 has a limiting slot that is open axially. One sidewall of the limiting slot is a second opening limiting structure 113, and the other sidewall is a second closing limiting structure 114. The handle limiting block 013 is located in the limiting slot. When the handle limiting block 013 contacts the second opening limiting structure 113, the handle 1 is in the opening position. When the handle limiting block 013 contacts the second closing limiting structure 114, the handle 1 is in the closing position.

[0130] The following is an exemplary description of the installation method of the handle spring 12 on the handle body 11:

[0131] In some examples, such as Figure 12 and Figure 15 As shown, the handle body 11 has a handle spring slot 115, the handle spring 12 is located in the handle spring slot 115, and the two torsion arms of the handle spring 12 extend from the two notches of the handle spring slot 115 respectively. Figure 14 As shown, a first handle spring hanging wall 116 and a second handle spring hanging wall 117 are provided at the two notches of the handle spring slot 115 , and the first handle spring hanging wall 116 and the second handle spring hanging wall 117 are respectively used to support two torsion arms.

[0132] The following is a more detailed exemplary description of the moving contact 2:

[0133] In some examples, such as Figure 16 As shown, the moving contact 2 has a waist-shaped hole 20, a driving circular shaft 21, a reset torsion spring mounting shaft 22, a reset spring mounting arm 23, a welding structure 24 and a moving contact point 25.

[0134] The waist-shaped hole 20 is used to fit the movable contact mounting shaft 011 on the ring housing 01 to achieve the rotational connection between the movable contact 2 and the housing 01. The side of the driving circular shaft 21 is used to contact the push rod 3. The reset torsion spring mounting shaft 22 is used to install the reset torsion spring 6. The reset spring mounting arm 23 is used to extend into the first end of the reset spring 5, such as Figure 13 As shown, the housing 01 has a return spring stopper structure 018, and the second end of the return spring 5 extends into the return spring stopper 018. The welding structure 24 is used to weld to the soft wire of the thermal system 06. The moving contact 25 is used to contact the static contact 03.

[0135] like Figure 13 As shown, the housing 01 further has a movable contact limiting column 017 , which is used to limit the rotation range of the movable contact 2 .

[0136] The present disclosure also provides a circuit breaker, such as Figure 1 and Figure 2 As shown, the circuit breaker includes a housing 01, a first terminal block 02, a static contact 03, an electromagnetic system 04, a second terminal block 05, a thermal system 06, and a movable contact operating mechanism 07 as described in any one of the first aspects. The first terminal block 02 is electrically connected to the static contact 03 via the electromagnetic system 04, and the second terminal block 05 is electrically connected to the movable contact 2 of the movable contact operating mechanism 07 via the thermal system 06. The latch 4 of the movable contact operating mechanism 07 is opposite to the electromagnetic system 04 and is in transmission connection with the thermal system 06.

[0137] For relevant content about circuit breakers, please refer to the above content and will not be repeated here.

[0138] The above are merely optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A moving contact operating mechanism, characterized in that: It comprises a handle (1), a moving contact (2), a push rod (3), a lock (4) and a return spring (5); The handle (1) and the moving contact (2) are both rotatably connected to the housing (01) of the circuit breaker; one end of the push rod (3) is rotatably connected to the handle (1) and the other end is in contact with the moving contact (2); the push rod (3) is used to push the moving contact (2) into contact with the static contact (03) of the circuit breaker during the closing process; The lock catch (4) is rotatably connected to the housing (01), and the push rod (3) is located on the rotation path of the lock catch (4). The lock catch (4) is used to drive the push rod (3) to separate from the moving contact (2) when the circuit is short-circuited or overloaded; The reset spring (5) is respectively against the housing (01) and the moving contact (2), and the reset spring (5) is used to drive the handle (1) to remain in the closed state through the moving contact (2) and the push rod (3) after closing, and to drive the moving contact (2) to separate from the static contact (03) after the push rod (3) separates from the moving contact (2).

2. The moving contact operating mechanism according to claim 1, characterized in that: The moving contact (2) has a waist-shaped hole (20), and the waist-shaped hole (20) is encircled by the moving contact mounting shaft (011) of the housing (01); The push rod (3) is used to push the moving contact (2) to rotate around the moving contact mounting shaft (011) in a first closing stage, and to push the moving contact (2) to swing relative to the moving contact mounting shaft (011) in a second closing stage, wherein the first closing stage is before the second closing stage; The reset spring (5) is also used to drive the moving contact (2) to be in close contact with the static contact (03) after closing the circuit breaker.

3. The moving contact operating mechanism according to claim 1 or 2, characterized in that: When the push rod (3) pushes the moving contact (2) to move, the surface of the moving contact (2) in contact with the push rod (3) is an arc surface, and the surface of the push rod (3) in contact with the moving contact (2) is a plane.

4. The moving contact operating mechanism according to claim 3, characterized in that: The moving contact (2) has a driving circular shaft (21), and the side surface of the driving circular shaft (21) is used to contact the push rod (3).

5. The moving contact operating mechanism according to claim 3, characterized in that: The push rod (3) includes a connecting member (31) and a rod member (32); The connecting member (31) is rotatably connected to the handle (1); The rod (32) is connected to the connecting member (31), and the cross section of the rod (32) is rectangular. The rod (32) is used to push the moving contact (2).

6. The moving contact operating mechanism according to claim 5, characterized in that: The connecting member (31) comprises a rotating shaft portion (311), a first clamping arm (312) and a second clamping arm (313); the rotating shaft portion (311) is rotatably connected to the handle (1); the rotating shaft portion (311) has a slot (3110) opening along the axial direction; the first clamping arm (312) and the second clamping arm (313) are arranged side by side; The rod (32) is U-shaped and comprises an insertion section (321), a connecting section (322) and a driving section (323) connected in sequence; the insertion section (321) is inserted into the slot (3110); the connecting section (322) is clamped between the first clamping arm (312) and the second clamping arm (313); and the driving section (323) is used to contact the moving contact (2).

7. The moving contact operating mechanism according to claim 1 or 2, characterized in that: The lock buckle (4) comprises a rotating connection portion (41), a first driving portion (42) and a second driving portion (43); The rotating connection portion (41) is rotationally connected to the housing (01); The first driving part (42) is opposite to the electromagnetic system (04) of the circuit breaker and is in transmission connection with the thermal system (06) of the circuit breaker; The push rod (3) is located on the rotation path of the second driving part (43), and the second driving part (43) is used to drive the push rod (3) to separate from the moving contact (2).

8. The moving contact operating mechanism according to claim 7, characterized in that: The portion of the first driving portion (42) facing the moving contact (2) has a driving protrusion (421); The moving contact (2) is located on the rotation path of the driving protrusion (421), and the driving protrusion (421) is used to drive the moving contact (2) to separate from the static contact (03) when the circuit is short-circuited or overloaded.

9. The moving contact operating mechanism according to claim 1 or 2, characterized in that: The movable contact operating mechanism further includes a reset torsion spring (6); The reset torsion spring (6) is located on the moving contact (2), and the first torsion arm of the reset torsion spring (6) abuts against the push rod (3), and the second torsion arm abuts against the lock (4); The reset torsion spring (6) is used to drive the push rod (3) and the moving contact (2) to remain in an abutting state, and to drive the lock catch (4) and the push rod (3) to remain in a separated state.

10. A circuit breaker, characterized in that: It comprises a housing (01), a first wiring component (02), a static contact (03), an electromagnetic system (04), a second wiring component (05), a thermal system (06), and a moving contact operating mechanism (07) according to any one of claims 1 to 9; The first wiring member (02) is electrically connected to the static contact (03) via the electromagnetic system (04), and the second wiring member (05) is electrically connected to the movable contact (2) of the movable contact operating mechanism (07) via the thermal system (06); The lock catch (4) of the moving contact operating mechanism (07) is opposite to the electromagnetic system (04) and is transmission-connected to the thermal system (06).

Images