breaker

Abstract

A circuit breaker includes an operating mechanism, a main contact mechanism and an auxiliary contact mechanism arranged in a housing, the operating mechanism includes a bracket, a switch rod and an elastic torsion member are installed on the bracket, the first arm of the elastic torsion member is connected to the bracket, the second arm of the elastic torsion member is connected to the switch rod, the auxiliary contact mechanism includes a push rod and an auxiliary contact, the push rod is in contact with the second arm of the elastic torsion member, when the operating mechanism drives the switch rod to drive the main contact mechanism to move, the push rod drives the auxiliary contact to move under the drive of the elastic torsion member. The closing and opening of the circuit breaker of the present invention are completely controlled by the position change of the elastic torsion member, and there is no need to overcome the resistance of the driving spring during the opening process, which reduces the burden of the operating mechanism.

Description

Technical Field

[0001] The invention relates to a circuit protector, in particular to a circuit breaker. Background Art

[0002] The auxiliary contacts of the existing motor circuit breaker are usually driven by a push rod arranged below the operating mechanism, a push plate cooperating with the push rod is arranged above the push rod, and a driving spring for pushing up the push plate is arranged below the push plate. Figure 4 As shown in FIG. 1 , when the motor circuit breaker is closed, the driving force for closing the main contacts and the auxiliary contacts is provided by the driving spring, and the driving force causes the push plate to drive the push rod to maintain a horizontal state; Figure 5 As shown, when the motor circuit breaker is disconnected, the operating mechanism drives the switch rod to push the push plate downward, and under the action of the push plate, the push rod rotates downward to disconnect the main contact and the auxiliary contact. As can be seen from the above, when the auxiliary contact of the existing motor circuit breaker changes from the closed state to the open state, the operating mechanism needs to overcome the resistance of the driving spring, which is not conducive to the disconnection of the circuit breaker and makes the operating mechanism bear a heavy burden. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a circuit breaker with simple structure and high reliability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A circuit breaker comprises an operating mechanism, a main contact mechanism and an auxiliary contact mechanism which are arranged in a shell, wherein the operating mechanism comprises a bracket, a switch rod and an elastic torsion member are mounted on the bracket, a first arm of the elastic torsion member is connected to the bracket, and a second arm of the elastic torsion member is connected to the switch rod, and the auxiliary contact mechanism comprises a push rod and an auxiliary contact, wherein the push rod contacts the second arm of the elastic torsion member, and when the operating mechanism drives the switch rod to drive the main contact mechanism to move, the push rod drives the auxiliary contact to move under the drive of the elastic torsion member.

[0006] Preferably, the auxiliary contact mechanism further comprises an auxiliary disconnecting elastic member for driving the push rod and the elastic torsion member to move synchronously, one end of the auxiliary disconnecting elastic member is connected to the middle of the push rod, and the other end is fixed in the housing.

[0007] Preferably, the auxiliary contact comprises an auxiliary static contact, an auxiliary moving contact, and a first elastic member, and the auxiliary moving contact is closed or opened with the auxiliary static contact under the action of the push rod and the first elastic member.

[0008] Preferably, the auxiliary static contact includes a normally open contact and a normally closed contact that are fixed and relatively arranged, and the two sides of the auxiliary moving contact are respectively provided with a first contact and a second contact that cooperate with the normally open contact and the normally closed contact, and the auxiliary moving contact moves between the normally open contact and the normally closed contact under the action of the push rod.

[0009] Preferably, the push rod is an L-shaped push rod, one end of the L-shaped push rod is connected to the auxiliary contact, and the other end of the L-shaped push rod is connected to the second arm of the elastic torsion member.

[0010] Preferably, the middle portion of the push rod is rotatably connected to the housing or the bracket, and both ends of the push rod are respectively connected to the second arm of the elastic torsion member and the auxiliary contact.

[0011] Preferably, the main contact mechanism includes a main contact and a second elastic member, the main contact includes a main static contact fixed in the shell and an active contact matching the main static contact, one side of the active contact is protruding with a pushing portion for being pushed by the switch rod, and the other side of the active contact is provided with a second elastic member.

[0012] Preferably, the elastic torsion member is a torsion spring.

[0013] Preferably, the switch rod is a triangular switch rod, and each corner of the triangular switch rod serves as a connection end; the first connection end of the triangular switch rod is drive-connected to the operating mechanism, the second connection end of the triangular switch rod is used for pivotal connection with the bracket, the third connection end of the triangular switch rod is connected to the second arm of the elastic torsion member, and the end of the third connection end of the triangular switch rod is used to drive the main contact mechanism to disconnect.

[0014] Preferably, the operating mechanism also includes a gear, a jumper and a lock mounted on the bracket; the gear is connected to the jumper through a first connecting rod, the jumper is connected to the lock by a buckle, and the jumper is connected to the switch rod through a second connecting rod. The gear rotates in the closing direction, and the jumper and the lock are locked. Under the action of the first connecting rod and the second connecting rod, the jumper drives the switch rod to the closing position so that the main contact mechanism and the auxiliary contact mechanism are both closed, and the elastic torsion member stores elastic potential energy; the gear rotates in the opening direction, the jumper and the lock are unlocked, and under the action of the first connecting rod and the second connecting rod, the elastic torsion member drives the switch rod to rotate to the opening position so that the main contact mechanism and the auxiliary contact mechanism are both disconnected.

[0015] The closing and opening principle of the auxiliary contact mechanism of the circuit breaker of the present invention is different from that of the existing motor circuit breaker. The auxiliary contact mechanism of the circuit breaker of the present invention is driven by the push rod during the process of deformation and energy storage of the elastic torsion member. The closing and opening of the auxiliary contact mechanism is completely controlled by the position change of the elastic torsion member. The auxiliary contact mechanism is driven by the push rod to operate, and there is no need for the driving spring in the prior art. There is no need to overcome the resistance of the driving spring during the operation, which reduces the burden on the operating mechanism.

[0016] In addition, by adding an auxiliary disconnecting elastic member, the push rod and the elastic torsion member can be driven to move synchronously, preventing the push rod from staying in a closed state due to the influence of friction. At the same time, the pressure on the switch rod can also be increased, which helps the overall disconnection of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the circuit breaker of the present invention when it is closed;

[0018] Figure 2 It is a schematic diagram of the structure of the circuit breaker of the present invention when it is disconnected;

[0019] Figure 3 It is a structural schematic diagram of a switch rod of a circuit breaker of the present invention;

[0020] Figure 4 is a schematic diagram of the structure of a circuit breaker in the background art when it is closed;

[0021] Figure 5 It is a structural schematic diagram of a circuit breaker in the background technology when it is disconnected. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1 to 5 The following embodiments are provided to further illustrate the specific implementation of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0023] A circuit breaker includes an operating mechanism, a main contact mechanism and an auxiliary contact mechanism arranged in a shell, the operating mechanism includes a bracket 11, a switch rod 4 and an elastic torsion member 5 are mounted on the bracket 11, a first arm 51 of the elastic torsion member 5 is connected to the bracket 11, and a second arm 52 of the elastic torsion member 5 is connected to the switch rod 4. The auxiliary contact mechanism includes a push rod 31 and an auxiliary contact, the push rod 31 is in contact with the second arm 52 of the elastic torsion member 5, and when the operating mechanism drives the switch rod 4 to drive the main contact mechanism to move, the push rod 31 drives the auxiliary contact to move under the drive of the elastic torsion member 5.

[0024] The closing and opening principle of the auxiliary contact mechanism of the circuit breaker of the present invention is different from that of the existing motor circuit breaker. The auxiliary contact mechanism of the circuit breaker of the present invention is driven by the push rod 31 during the process of deformation and energy storage of the elastic torsion member 5. The closing and opening of the auxiliary contact mechanism is completely controlled by the position change of the elastic torsion member 5. The auxiliary contact mechanism is driven by the push rod 31, and there is no need for the driving spring in the prior art. There is no need to overcome the resistance of the driving spring during the action, which reduces the burden on the operating mechanism.

[0025] like Figure 1-2As shown, a motor circuit breaker includes an operating mechanism, a main contact mechanism and an auxiliary contact mechanism arranged in a shell, the operating mechanism includes a bracket 11, and a switch rod 4 and an elastic torsion member 5 are installed on the bracket 11, the first arm 51 of the elastic torsion member 5 is connected to the bracket 11, and the second arm 52 of the elastic torsion member 5 is connected to the switch rod 4. Specifically, the bracket 11 includes two brackets 11 arranged opposite to each other, only one of which is shown in the figure, the two brackets 11 are connected by an axis or rivets, the switch rod 4 is pivotally arranged on the axis between the two brackets 11, and the first arm 51 of the elastic torsion member 5 is installed on a bracket 11 not shown. It can be understood that the first arm 51 of the elastic torsion member 5 can also be arranged on a bracket 11 shown in the figure. The auxiliary contact mechanism includes a push rod 31 and an auxiliary contact. The push rod 31 contacts the second arm 52 of the elastic torsion member 5. When the operating mechanism drives the switch rod 4 to drive the main contact mechanism to move, the push rod 31 drives the auxiliary contact to move under the drive of the elastic torsion member 5, wherein the auxiliary contact is detachably connected to the circuit breaker housing. When the auxiliary contact is not needed, the auxiliary contact can be removed. Usually, a plurality of main contact mechanisms are arranged in the housing of the circuit breaker. The auxiliary contact has a housing, which is inserted and arranged on the side wall of the circuit breaker housing and cooperates with the push rod 31 in the housing. The push rod 31 is arranged in the housing. The auxiliary contact can be arranged outside the housing as an additional device to be operated by the push rod 31, or it can be arranged in the housing to be operated by the push rod 31.

[0026] In this embodiment, the movement of the push rod 31 is a translational movement. When the operating mechanism drives the switch rod 4 to close the main contact mechanism, the second arm 52 of the elastic torsion member 5 is lifted upward during the process of compressing and storing energy under the drive of the switch rod 4. The push rod 31 rises with the rise of the second arm 52 of the elastic torsion member 5. At this time, the push rod 31 drives the auxiliary contact to close. Figure 1 As shown; when the operating mechanism drives the switch rod 4 to disconnect the main contact, the elastic torsion member 5 rotates with the switch rod 4, and the second arm 52 of the elastic torsion member 5 is driven to move downward in the process of releasing the elastic potential energy, and the push rod 31 moves downward under the action of the elastic torsion member 5, thereby disconnecting the auxiliary contact, as shown in FIG. Figure 2 Of course, it is also possible that when the switch rod 4 closes the main contact, the elastic torsion member 5 disconnects the auxiliary contact through the push rod 31, that is, when the push rod 31 moves upward or downward synchronously under the drive of the elastic torsion member 5, the main contact and the auxiliary contact can be in a closed state and a disconnected state respectively, which is not shown in the drawings.

[0027] In order to further optimize the disconnection of the auxiliary contact mechanism, an auxiliary disconnection elastic member 6 is preferably provided in the housing, and the auxiliary disconnection elastic member 6 drives the push rod 31 to move synchronously with the elastic torsion member 5 to disconnect the main contact mechanism and the auxiliary contact mechanism synchronously. Specifically, one end of the auxiliary disconnection elastic member 6 is connected to the middle of the push rod 31, and the other end is fixed in the housing. In addition, by adding an auxiliary disconnection elastic member 6, the push rod 31 can be driven to move synchronously with the elastic torsion member 5, so as to prevent the push rod 31 from staying in the closed state due to the influence of friction, and at the same time, the pressure on the switch rod 4 can be increased, which is conducive to the overall disconnection of the motor circuit breaker.

[0028] The main contact mechanism includes a main contact and a second elastic member 23. The switch rod 4 and the second elastic member 23 provide driving force and reset force for the main contact respectively. The main contact includes a main static contact 21 fixed in the housing and an active contact 22 matched with the main static contact 21. The auxiliary contact includes an auxiliary static contact, an auxiliary moving contact 323 and a first elastic member 33. The auxiliary moving contact 323 is closed or disconnected with the auxiliary static contact under the action of the push rod 31 and the first elastic member 33. Whether the auxiliary contact and the main contact can be closed or disconnected synchronously is related to the position of the auxiliary static contact and the main static contact 21. The auxiliary static contact and the main static contact 21 are arranged on the same side, so that the auxiliary contact and the main contact are closed or disconnected synchronously. The auxiliary static contact and the main static contact 21 are arranged on different sides. When the main contact is closed, the auxiliary contact is disconnected.

[0029] The auxiliary contact includes at least one group of auxiliary static contacts and auxiliary moving contacts 323, and a first elastic member 33. The auxiliary moving contact 323 is closed or disconnected with the auxiliary static contact under the action of the push rod 31 and the first elastic member 33. The auxiliary static contact in this embodiment includes two groups of normally open contacts 321 and normally closed contacts 322 arranged opposite to each other. The first contact and the second contact matching the normally open contact 321 and the normally closed contact 322 are respectively arranged on both sides of the auxiliary moving contact 323. The auxiliary moving contact 323 moves between the normally open contact 321 and the normally closed contact 322 under the action of the push rod 31, and the first contact and the second contact can be connected by an elastic member. The push rod 31 drives the auxiliary moving contact 323 to move upward so that the first contact contacts the normally open contact 321 to achieve the auxiliary contact closing and the normally open contact closing; the side with the second contact is connected to the first elastic member 33, and the first elastic member 33 provides a downward driving force for the auxiliary moving contact 323 to drive the second contact to contact the normally closed contact 322 to achieve the auxiliary contact opening and the normally open contact opening. The first elastic member 33 provides a reset driving force for the auxiliary contact. When the push rod 31 moves the auxiliary moving contact 323 upward to close under the action of the elastic torsion member 5, it needs to overcome the resistance of the first elastic member 33; when the push rod 31 moves the auxiliary moving contact 323 downward to open under the action of the elastic torsion member 5, the first elastic member 33 provides a downward reset driving force for the auxiliary moving contact 323 to accelerate the opening. Specifically, the push rod 31 can be configured as an L-shaped push rod 31, but is not limited to the L-shape. One end of the L-shaped push rod 31 is connected to the auxiliary contact, and the other end of the L-shaped push rod 31 is connected to the second arm 52 of the elastic torsion member 5. A slide rail for the auxiliary push rod 31 to move can be set in the shell or the bracket 11. For example, the slide rail is a guide groove set in the vertical direction.

[0030] Specifically, Figure 1-2 As shown, the main contact mechanism includes a main contact and a second elastic member 23. The second elastic member 23 provides an upward driving force for the main contact, so that the main contact is disconnected under the joint action of the second elastic member 23 and the switch rod 4. The main contact includes a main static contact 21 fixed in the housing and an active contact 22 matched with the main static contact 21. The active contact 22 is provided with a protruding push portion 221 for being pushed by the switch rod 4 on one side close to the main static contact 21. The setting of the push portion 221 is conducive to reducing the moving distance of the switch rod 4 or shortening the size of the switch rod 4. In this embodiment, the active contact 22 is provided with a second elastic member 23 on the side away from the main static contact 21. The elastic force of the second elastic member 23 makes the active contact 22 contact and close with the main static contact 21. The operating mechanism drives the switch rod 4 to rotate and press down the push portion 221 of the active contact 22, overcoming the elastic force of the second elastic member 23 to separate and disconnect the active contact 22 from the main static contact 21.

[0031] As another embodiment, the middle part of the push rod 31 is rotatably connected to the housing or the bracket 11, and the two ends of the push rod 31 are respectively hinged to the second arm 52 of the elastic torsion member 5 and the auxiliary contact. Using the lever principle, when the elastic torsion member 5 drives one end of the push rod 31 to rise, the other end of the push rod 31 drops and acts on the auxiliary contact to open or close it. In addition, the auxiliary contact mechanism can also include other transmission or connecting rod structures that cooperate with the push rod 31 to drive the auxiliary contact to move.

[0032] Both of the above embodiments can be used as Figure 3 The switch rod 4 structure shown in the figure is preferably configured as a roughly triangular switch rod 4. Of course, other shapes are also possible, but it still needs to have three independent connection ends; specifically, each corner of the triangular switch rod 4 serves as a connection end; the first connection end 41 of the triangular switch rod 4 is drive-connected to the operating mechanism, the second connection end 42 of the triangular switch rod 4 is used for pivotal connection with the bracket 11, the third connection end 43 of the triangular switch rod 4 is connected to the second arm 52 of the elastic torsion member 5, and the end of the third connection end 43 of the triangular switch rod 4 is used to drive the main contact mechanism to disconnect, specifically contacting the pushing portion 221 of the active contact 22.

[0033] The operating mechanism specifically includes a gear 12, a trip buckle 13 and a lock buckle 14 installed on the bracket 11; the gear 12 is installed on the upper part of the bracket 11, the trip buckle 13 and the lock buckle 14 are arranged on one side of the gear 12, the gear 12 and the trip buckle 13 are connected by a first connecting rod 15, the trip buckle 13 and the lock buckle 14 are snap-connected, and are rotatably installed on the bracket 11, the trip buckle 13 and the switch rod 4 are connected by a second connecting rod 16, the gear 12 rotates in the closing direction, the trip buckle 13 and the lock buckle 14 are locked, and under the action of the first connecting rod 15 and the second connecting rod 16, the trip buckle 13 drives the trip buckle 13 arranged on the bracket 11 The lower switch rod 4 turns to the closing position, the elastic torsion member 5 stores elastic potential energy, the end of the third connection end 43 of the switch rod 4 rises and separates from the main contact mechanism, in this process, the push rod 31 is driven by the elastic torsion member 5 to operate the auxiliary contact mechanism; the gear 12 rotates in the opening direction, the tripping catch 13 and the lock catch 14 are unlocked, and under the action of the first connecting rod 15 and the second connecting rod 16, the elastic torsion member 5 drives the switch rod 4 to rotate to the opening position, the end of the third connection end 43 of the switch rod 4 drops to trigger the main contact mechanism, and accordingly, the push rod 31 is driven by the elastic torsion member 5 to trigger the auxiliary contact mechanism. Specifically, the gear 12 and the switch rod 4 are respectively arranged on the upper and lower sides of the bracket 11, the elastic torsion member 5 is arranged on one side of the gear 12 and the switch rod 4, and the tripping catch 13 and the lock catch 14 are arranged on the other side of the gear 12 and the switch rod 4.

[0034] The elastic torsion member 5 is a torsion spring, and the first elastic member 33, the second elastic member 23 and the auxiliary breaking elastic member 6 are all compression springs.

[0035] Compared with the existing motor circuit breaker, the closing and opening of the auxiliary contact mechanism of the present invention relies on the elastic torsion member 5 in the motor circuit breaker for storing elastic potential energy. The position change of the elastic torsion member 5 during the closing and opening switching process is used to drive the auxiliary contact mechanism to close and open, thereby increasing the function of the elastic torsion member 5, canceling the push plate a originally arranged in the shell and the driving spring b under the push plate a for driving the main contact mechanism and the auxiliary contact mechanism, and changing the rotation push of the original push rod 31' to the up and down displacement driven by the torsion elastic member 5, thereby reducing the resistance that the operating mechanism needs to overcome during the closing and opening process, which is beneficial to the product optimization of the motor circuit breaker.

[0036] Figure 1-2 Only one main contact mechanism and one auxiliary contact mechanism are shown, but their specific number is not limited to one.

[0037] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising an operating mechanism, a main contact mechanism and an auxiliary contact mechanism arranged in a housing, wherein the operating mechanism comprises a bracket (11), a switch rod (4) and an elastic torsion member (5) are mounted on the bracket (11), a first arm (51) of the elastic torsion member (5) is connected to the bracket (11), and a second arm (52) of the elastic torsion member (5) is connected to the switch rod (4), characterized in that: The auxiliary contact mechanism comprises a push rod (31) and an auxiliary contact. The push rod (31) contacts the second arm (52) of the elastic torsion member (5). When the operating mechanism drives the switch rod (4) to drive the main contact mechanism to move, the push rod (31) drives the auxiliary contact to move under the drive of the elastic torsion member (5).

2. The circuit breaker according to claim 1, characterized in that: The auxiliary contact mechanism also includes an auxiliary disconnecting elastic member (6) for driving the push rod (31) and the elastic torsion member (5) to move synchronously. One end of the auxiliary disconnecting elastic member (6) is connected to the middle of the push rod (31), and the other end is fixed in the housing.

3. The circuit breaker according to claim 1, characterized in that: The auxiliary contact comprises an auxiliary static contact and an auxiliary moving contact (323), and a first elastic member (33); the auxiliary moving contact (323) is closed or opened with the auxiliary static contact under the action of the push rod (31) and the first elastic member (33).

4. The circuit breaker according to claim 3, characterized in that: The auxiliary static contact comprises a normally open contact (321) and a normally closed contact (322) which are fixed and arranged opposite to each other. The two sides of the auxiliary movable contact (323) are respectively provided with a first contact and a second contact which cooperate with the normally open contact (321) and the normally closed contact (322). The auxiliary movable contact (323) moves between the normally open contact (321) and the normally closed contact (322) under the action of the push rod (31).

5. The circuit breaker according to claim 1, characterized in that: The push rod (31) is an L-shaped push rod (31), one end of the L-shaped push rod (31) is connected to the auxiliary contact, and the other end of the L-shaped push rod (31) is connected to the second arm (52) of the elastic torsion member (5).

6. The circuit breaker according to claim 1, characterized in that: The middle part of the push rod (31) is rotatably connected to the housing or the bracket (11), and the two ends of the push rod (31) are respectively connected to the second arm (52) and the auxiliary contact of the elastic torsion member (5).

7. The circuit breaker according to claim 1, characterized in that: The main contact mechanism comprises a main contact and a second elastic member (23), wherein the main contact comprises a main static contact (21) fixed in a housing and an active contact (22) matched with the main static contact (21), wherein a pushing portion (221) protrudes from one side of the active contact (22) for being pushed by a switch rod (4), and a second elastic member (23) is provided on the other side of the active contact (22).

8. The circuit breaker according to claim 1, characterized in that: The elastic torsion member (5) is a torsion spring.

9. The circuit breaker according to claim 1, characterized in that: The switch rod (4) is a triangular switch rod (4), and each corner of the triangular switch rod (4) serves as a connection end; the first connection end (41) of the triangular switch rod (4) is drivingly connected to the operating mechanism, the second connection end (42) of the triangular switch rod (4) is used for pivoting connection with the bracket (11), the third connection end (43) of the triangular switch rod (4) is connected to the second arm (52) of the elastic torsion member (5), and the end of the third connection end (43) of the triangular switch rod (4) is used for driving the main contact mechanism to disconnect.

10. The circuit breaker according to claim 1, characterized in that: The operating mechanism further comprises a gear (12), a trip buckle (13) and a lock buckle (14) mounted on the bracket (11); the gear (12) and the trip buckle (13) are connected via a first connecting rod (15), the trip buckle (13) and the lock buckle (14) are snap-connected, the trip buckle (13) and the switch rod (4) are connected via a second connecting rod (16), when the gear (12) rotates in the closing direction, the trip buckle (13) and the lock buckle (14) are locked, and when the first connecting rod (15) and the trip buckle (13) are in a closed position, the trip buckle (13) and the lock buckle (14) are in a closed position. Under the action of the second connecting rod (16), the trip button (13) drives the switch rod (4) to rotate to the closing position so that the main contact mechanism and the auxiliary contact mechanism are both closed, and the elastic torsion member (5) stores elastic potential energy; the gear (12) rotates in the opening direction, the trip button (13) and the lock button (14) are unlocked, and under the action of the first connecting rod (15) and the second connecting rod (16), the elastic torsion member (5) drives the switch rod (4) to rotate to the opening position so that the main contact mechanism and the auxiliary contact mechanism are both disconnected.

Images